Conformable Solvent-Based Bandage and Coating Material
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Abstract:
Liquid hemostatic coating materials comprise a cyanoacrylate monomer and a solvent system comprising a volatile, non-reactive liquid that is non-stinging and non-irritating to a user. The material forms a coating or bandage in the form of a film that when applied and adhered to a surface or to the skin of a user inhibits the application surface from adhering to another surface.
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US00764l893B2
(12) Ulllted States Patent (10) Patent No.: US 7,641,893 B2
Salamone et al. (45) Date of Patent: Jan. 5, 2010
(54) CONFORMABLE SOLVENT-BASED 6,143,805 A 11/2000 Hickey et al.
BANDAGE AND COATING MATERIAL 6,183,593 B1 2/2001 Narang et al.
6,217,603 B1 4/2001 Clark et al.
(75) Inventors: Ann Beal Salamone, Boca Raton, FL 653585503 B1 3;2002 Gerrilslh 1
6 383 502 B1 5 2002 D .
(US); Joseph C. Salamone, Boca Raton, 6’455’064 B1 9/2002 NE‘; eztegla
FL (US) 6:479:725 B1 11/2002 Brothegrs .
. , 6,565,840 B1 5/2003 Cl k t l.
(73) Assignee: Rochal Industries, LLP, Boca Raton, 6,607,631 B1 8/2003 Bfiej: 6: a1.
FL (US) 6,607,632 B1* 8/2003 McDonnell et al. .... .. 156/331.2
. . . . . 6J46667 B2 6Q004 Badqoeta1
( * ) Notice: Subject to any disclaimer, the term of this 2004/0223945 A1 11/2004 Kidd et 31,
patent is extended or adjusted under 35 2006/0030808 A1* 2/2006 Kennedy ................... .. 602/41
U.S.C. 154 b b 0 da .
( ) y Y5 OTHER PUBLICATIONS
(21) APPL N0-3 11/4653237 http://www.sigmaaldrich.com/catalog/ProductDetai.*
. http://www.osha.gov/dts/chemicalsampling/data/CH_231525.
(22) Filed: Aug. 17, 2006 htm1,*
http://en.wikipedia.org/wiki/Polydimethylsiloxane.*
(65) Prior Publication Data U.S. Appl.1No. 09/430,289, filed Oct.129, 1999, P’Alessio, gt al. 1
D ' .“AnO 1-2-C F ' S H -
Us
_ _ (2001).
Related U-S- Apphcatmn Data Eaglstein, et al., “A Liquid Adhesive Bandage for the Treatment of
(60) Provisional application No. 60/708,858, filed on Aug. Minor Cuts and Abrasions”, Dermatol Surg, 28(3): 263-67 (2002).
(51)
(52)
(58)
(56)
17, 2005, provisional application No. 60/708,898,
filed on Aug. 17, 2005.
Int. Cl.
A61K 31/765 (2006.01)
U.S. Cl. ............................... .. 424/78.31; 424/78.03
Field of Classification Search ............ .. 424/78.31,
424/447, 78.02, 78.06; 602/52; 156/329
See application file for complete search history.
References Cited
U.S. PATENT DOCUMENTS
3,667,472 A * 6/1972 Halpern .................... .. 606/214
3,940,362 A 2/1976 Overhults
4,313,865 A 2/1982 Teramoto et al.
4,560,723 A 12/1985 Millet et al.
4,987,893 A 1/1991 Salamone et al.
5,103,812 A 4/1992 Salamone et al.
5,140,084 A 8/1992 Mikuniet al.
5,214,093 A 5/1993 Nell et al.
5,259,835 A 11/1993 Clark et al.
5,328,687 A 7/1994 Leung et al.
5,928,611 A 7/1999 Leung
5,981,621 A 11/1999 Clarket al.
6,010,714 A 1/2000 Leung et al.
6,143,352 A 11/2000 Clark et al.
Singer, et al., “Comparative trial of octyl-cyanoacrylate and silver
sulfadiazine for the treatment of full-thickness . . . ”, Wound Repair
and Regeneration, 7: 356-361 (1999).
Singer, et al., “Evlauation of a new liquid occlusive dressing for
excisional wounds”, Wound Repair and Regeneration, 11: 181-87
(2003).
Vauthier, et al., “Poly(alkylcyanoacrylates) as biodegradable materi-
als for biomedical applications”, Advanced Drug Delivery Reviews,
55:519-548 (2003).
* cited by examiner
Primary Examiner—Michael G. Hartley
Assistant Examiner—James W. Rogers
(74) Attorney, Agent, or Firm—Novak Druce+Quigg; J.
Rodman Steele, Jr.; Gregory M. Lefkowitz
(57) ABSTRACT
Liquid hemostatic coating materials comprise a cyanoacry-
late monomer and a solvent system comprising a volatile,
non-reactive liquid that is non-stinging and non-irritating to a
user. The material forms a coating or bandage in the form of
a film that when applied and adhered to a surface or to the skin
of a user inhibits the application surface from adhering to
another surface.
18 Claims, N0 Drawings
US 7,641,893 B2
1
CONFORMABLE SOLVENT-BASED
BANDAGE AND COATING MATERIAL
CROSS-REFERENCE TO RELATED
APPLICATIONS
This application claims the priority of U.S. Provisional
Application No. 60/708,858, filed Aug. 17, 2005, and U.S.
Provisional Application No. 60/708,898, filedAug. 17, 2005,
both entitled CONFORMABLE SOLVENT-BASED BAN-
DAGE AND COATING MATERIAL, which are incorpo-
rated herein by reference in their entirety.
FIELD OF INVENTION
This invention relates generally to hemostatic coating
materials that are useful for protecting and repairing surfaces
such as biological surfaces, including surgical sites, skin and
mucous membranes. The hemostatic liquid adhesive materi-
als are comprised of a polymerizable cyanoacrylate monomer
component and a non-stinging, non-irritating, non-reactive,
volatile liquid, wherein the generated coating does not adhere
to a second surface. The hemostatic liquid adhesive materials
may also comprise a silane-containing polymer component,
and preferably a siloxysilane polymer, to provide enhanced
forming.
BACKGROUND OF THE INVENTION
Cyanoacrylates have found use as liquid adhesive ban-
dages, particularly butyl and octyl cyanoacrylates (US. Pat.
Nos. 6,183,593; 6,143,805). These materials provide hemo-
stasis with quick film formation and they are especially useful
for closing thin wounds, such as those created by paper or
razor cuts. Wounds that are in high flex areas are not suitable
for treatment with cyanoacrylates as they tend to increase
scarring, if well adhered, or to delarninate quickly, if not well
adhered, due to their intrinsic brittleness. Polydimethylsilox-
anes have been blended with cyanoacrylates to increase flex-
ibility and elasticity (US. Pat. Nos. 6,746,667, 6,183,593,
5,140,084). Cyanoacrylates have low moisture vapor trans-
mission rates and, hence, do not allow water vapor to equili-
brate at the wound site to allow for optimum wound healing.
Cyanoacrylates are also known for their ability to adhere two
surfaces together quickly, which is a benefit for many surgical
and repair applications but is problematic for use as a hemo-
static agent or a liquid adhesive bandage where the user does
not desire to adhere two biological surfaces or to another
object, e.g. finger to finger or foot to floor.
Additionally, cyanoacrylate monomers when used as liq-
uid adhesive bandages have been found to cause patient dis-
comfort when applied to the skin as polymerization rapidly
occurs when placed on a wet surface, generating heat. In
addressing this problem, U.S. Pat. No. 6,010,714 discloses a
biocompatible monomer (preferably a cyanoacrylate) with an
effective amount of a heat dissipating liquid or solid to reduce
the exothermic polymerization temperature of the cyanoacry-
late. For the heat dissipating liquids cited, which include
ethers, ketones, chlorofluorocarbons, alkanes, alcohols, alk-
enes and mixtures thereof, each of these organic solvents
would cause stinging or irritation on an open wound, thus
compromising their use in providing patient comfort and
enhanced health. Additionally, U.S. Pat. No. 6,010,714 dis-
closes that the solvents employed do not affect the polymer-
ization rate of the monomer. Thus, these solvents do not
decrease the polymerization rate, and therefore do not miti-
gate the rapid release of heat over time as the monomer
polymerizes.
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A category of liquid adhesive bandage has included non-
hemostatic alkylsiloxysiloxane-containing polymers
admixed with liquid polydimethylsiloxanes (US. Pat. Nos.
5,103,812 and 4,987,893) which provide non-stinging, non-
irritating coating materials that allow body fluid evaporation
and oxygen transport, while protecting the body surface from
further contamination and desiccation. In another variation,
alkylsiloxysiloxane-containing polymers are admixed with
isooctane to provide similar coating properties (US. Pat. No.
6,383,502). These coatings have the common disadvantages
of loss of adhesion toward hydrated surfaces, loss of adhesion
in higher flexibility areas such as knuckles or knees, and no
hemostatic capability.
Another category of polymer useful as a liquid adhesive
bandage with no hemostatic activity, cycloalkyl methacrylate
copolymers, has been found to be soluble in a mixture of
liquid polydimethylsiloxanes, iso-octane and isododecane
(US. Pat. No. 6,358,503).
U.S. Pat. No. 5,214,093 discloses the use of 50%
cyanoacrylate monomer, 25% polydimethylsiloxanes and
25% 3-methacryloxypropyltris(trimethylsiloxy)silane
(TRIS) monomer as an adhesive formulation for nonsurgical
blepheroplasty. This composition raises toxicity and irritation
issues as TRIS monomer is applied directly on the eyelid to
prepare the surface prior to application of the cyanoacrylate
bonding agent.
SUMMARY
The present invention provides a liquid hemostatic coating
material that can act as a bandage or dressing to protect or
repair wounds and surgical incisions, or to treat damaged or
threatened skin or mucosal tissue when applied in liquid form
and air dried on a biological surface, forming an adherent,
solid protective coating without significant stinging or irrita-
tion to the skin, tissues or mucous membranes of the user and
where said coating does not adhere to a second surface.
In a preferred embodiment, liquid hemostatic coating
materials comprise a cyanoacrylate monomer and a solvent
system comprising a volatile hydrophobic liquid, that is non-
reactive with the cyanoacrylate monomer prior to application,
and that is non-stinging and non-irritating to a user. A hemo-
static coating is a coating that arrests the flow of blood. A
non-stinging liquid is a liquid that does not cause sharp,
sudden, momentary pain when placed upon damaged or
undamaged skin, or open wounds, and the like. A non-irritat-
ing liquid is a liquid that does not cause inflammation or
soreness when placed upon damaged or undamaged skin, or
open wounds, and the like. A volatile, hydrophobic liquid is
one that is not soluble in water and volatilizes at room orbody
temperature.
In a preferred embodiment, the cyanoacrylate monomer is
present from about 0.1% to about 99.9% by weight, more
preferably, the cyanoacrylate monomer is present from about
0.1 to about 95% by weight, and most preferably, the
cyanoacrylate monomer is present from about 0.1 to about
90% by weight. Preferably, the non-stinging, non-irritating,
volatile non-reactive liquid is present from about 0.1% up to
99.9% by weight, more preferably the volatile non-reactive
liquid is present from about 5% up to 99.9% by weight, most
preferably from about 10% to 99.9% by weight. The material
forms a coating or bandage when applied to a surface or the
skin of a user.
In a preferred embodiment, the non-stinging, non-irritat-
ing, volatile, non-reactive liquid is a low molecular weight
linear or cyclic siloxane. Silicone liquids, which are inor-
ganic/organic hybrids, are noted for their very low critical
US 7,641,893 B2
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surface tensions. When a cyanoacrylate monomer is admixed
with a siloxane solvent, such as hexamethyldisiloxane, and
said solution is applied to a wet surface, the contents of the
liquid at the air interface will be predominantly the silicone
liquid. This silicone-containing interface thus prevents adhe-
sion of the polymerizing cyanoacrylate to another surface.
Furthermore, because of the low surface tension of silicone
liquids, the mixture will spread easily over a biological sur-
face in comparison to the application of neat cyanoacrylate,
which will have a tendency to bead and not flow. Thus, the
incorporation of a siloxane liquid with a cyanoacrylate will
lead to more rapid coverage of a damaged area in a shorter
time than neat cyanoacrylate.
In another preferred embodiment, the liquid coating mate-
rials of this invention comprise a silane-containing polymer,
preferably a siloxysilane-containing polymer, a cyanoacry-
late monomer, and a solvent system comprising a volatile,
non-reactive hydrophobic (non-polar) liquid that is non-
stinging and non-irritating to a user. Preferably, the polymer is
present from about 0.01% to about 99.5% by weight, more
preferably from about 0.5% to about 70% by weight, most
preferably from about 1% to about 40%. Additionally, the
cyanoacrylate monomer is present from about 0.1% to about
99.5% by weight, more preferably, from about 0.1 to about
70% by weight, most preferably from about 0.5% to about
50%. The non-stinging, non-irritating, volatile, hydrophobic
liquid is present from about 0.5% to 99.9% by weight, more
preferably about 5% to 99.5% by weight, most preferably
from about 10% to about 98.5%. The material forms a coat-
ing, bandage or glue in the form of a film when applied to a
surface or the skin of a user, wherein said surface does not
bond to another surface. The siloxysilane-containing poly-
mer provides for water and oxygen transport through the
polymer film that is believed to aid in healing. Without wish-
ing to be bound by theory, the film is in the form of an
interpenetrating polymer network, wherein the cyanoacrylate
polymer is interdispersed within the siloxysilane polymer.
In a preferred embodiment, when a siloxysilane-contain-
ing polymer is present, the siloxysilane-containing polymer
comprises at least one vinyl-containing siloxysilane mono-
mer (about 20 to 85 mole %) copolymerized with monomers
that, in polymer form, are not reactive with the cyanoacrylate
monomer prior to application to the surface. These non-reac-
tive monomers may serve the function of increasing adhesion
and cohesion of the polymer. The non-stinging, non-irritat-
ing, volatile, non-reactive hydrophobic liquid is preferably a
volatile, low molecular weight linear or cyclic siloxane.
In another preferred embodiment, siloxysilane monomers
according to claim 5 comprise at least one of:
3-methacryloyloxypropyltris(trimethylsiloxy)silane,
3-methacryloyloxypropylpentarnethyldisiloxane,
3-methacryloyloxypropylbis(trimethylsiloxy)methylsi-
lane,
3-methacryloyloxypropyltris(vinyldimethylsiloxy)silane,
3-methacryloyloxymethylbis(trimethylsiloxy)(pentam-
ethyldisiloxanyl)silane,
3-methacryloyloxyethyltris(pentamethyldisiloxanyl)si-
lane,
methacryloyloxymethylbis(trimethylsiloxy)methylsilane,
methacryloyloxymethyltris(trimethylsiloxy)silane,
3-methacryloyloxypropylheptacyclopentyl-T8-silsesqui-
oxane,
3-methacryloyloxypropylheptaisobutyl-T8-silsesquiox-
ane,
3-acryloyloxypropylmethylbis(trimethylsiloxy)silane,
3-acryloyloxypropyltris(trimethylsiloxy)silane,
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3 -methacryloyloxypropyl-1, 1, 1 -triphenyl-3 ,3 -dimethyld-
isiloxane,
3-methacrylamidopropyltris(trimethylsiloxy)silane,
3-acrylamidopropyltris(trimethylsiloxy)silane,
p-vinylphenyltris(trimethylsiloxy)silane,
p-vinylbenzyltris(trimethylsiloxy)silane,
vinyloxyethyltris(trimethylsiloxy)silane,
vinylnonyldimethyl(trimethylsiloxy)silane,
vinylnonyltris(trimethylsiloxy)silane,
vinylmethylbis(trimethylsiloxy)silane,
vinylpentamethyldisiloxane,
O-(vinyloxyethyl) -N- (tris[trimethylsiloxy] silylpropyl)
urethane,
vinylphenylbis(trimethylsiloxy)silane,
vinyltris(dimethylsiloxy)silane,
vinyltris(trimethylsiloxy)silane,
vinyl -terminated polydimethylsiloxane,
polydimethylsiloxane monoacrylate,
polydimethylsiloxane monomethacrylate,
polymethylphenylsiloxane monoacrylate,
polymethylphenylsiloxane monomethacrylate, or
3-acryloyloxypropyltris(polydimethylsiloxanyl)silane.
In another preferred embodiment the non-stinging, non-
irritating, volatile, non-reactive liquid is selected from the
group having a solubility parameter from 4.9-12.5 (cal/cm3)
I 2
In another preferred embodiment, the non-stinging, non-
irritating, volatile, non-reactive liquid is selected from the
group having a solubility parameter from 5-10 (cal/cm3)1/2.
In yet another embodiment, the non-stinging, non-irritat-
ing, volatile, non-reactive liquid comprises volatile linear and
cyclic siloxanes, and volatile polydimethylsiloxanes.
In a preferred embodiment, a coating provides for hemo-
stasis.
In another preferred embodiment, the volatile, non-reac-
tive solvent is an alkane, such as isooctane, octane, neopen-
tane, and the like; volatile fluorocarbons, such as pentafluo-
ropropane, perfluoroheptane, perfluoromethylcyclohexane
and the like; or a volatile gas, when used under pressure as a
solvent, such as carbon dioxide.
In another preferred embodiment, a coating is provided
that adheres to its applied surface but does not allow the
applied surface to adhere to another surface.
In another preferred embodiment, a coating is provided
that does not generate discomfort through generation of sting-
ing or irritation when the solvent contacts damaged skin or
tissue.
In another preferred embodiment, the non-stinging, non-
irritating solvent decreases the polymerization rate of the
cyanoacrylate monomer, thus decreasing with time the
release of its heat of polymerization. The greater the concen-
tration of non-stinging, non-irritating solvent, the greater the
reduction in the rate of polymerization and the less heat
generated with time.
In another preferred embodiment, a coating is provided
that does not generate discomfort through generation of heat
from the polymerizing cyanoacrylate monomer, through
volatilization of the non-stinging, non-irritating solvent,
when said coating is applied to a surface. Altematively, by
decreasing the concentration of the non-stinging solvent, cau-
terization can be effected if it is desired to reduce or kill
microorganisms at a wound site.
In another preferred embodiment, a coating is provided
that is adherent to hydrated and/or non-hydrated surfaces.
In another preferred embodiment, a coating is provided
that remains adherent to a surface when exposed to extemal
water, soaps, detergents, and skincare products.
US 7,641,893 B2
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In another preferred embodiment, a coating is provided
that prevents further microorganism or particulate contarni-
nation to skin or mucous membrane wounds or incisions.
In another preferred embodiment, a transparent covering is
provided that does not attract or hold dirt and can remain
colorless and clear for wound viewing as well as cosmetic
attractiveness.
In another preferred embodiment, a coating is provided,
that, when applied, controls body fluid loss from an abraded
area.
In another preferred embodiment, a polymer film is pro-
vided which allows moisture and oxygen transport.
In another preferred embodiment, a polymer film is pro-
vided in which medicaments or other active agents may be
incorporated for controlled delivery into targeted areas.
In another preferred embodiment, a coating is provided
that, after application to a surface, releases from that surface
gradually over time without requiring externally applied sol-
vents or other removal methods.
A still further object of this invention is to provide a sur-
gical glue wherein a treated surface will not attach to other
surrounding surfaces.
Other aspects of the invention are described infra.
DETAILED DESCRIPTION
The cyanoacrylate monomers, when incorporated into
non-stinging, non-irritating, volatile, non-reactive liquids and
when polymerized, provide for a fast drying, hemostatic,
adherent, non-stinging and non-irritating liquid adhesive
coating or bandage that inhibits adhesion of two surfaces to
each other. In the absence of the non-stinging, non-irritating,
volatile, non-reactive liquid, considerable discomfort is
caused by a volatile organic solvent coming in contact with
damaged skin as well as heat generation due to the rapid
polymerization of the cyanoacrylate monomer. The non-
stinging, non-irritating, volatile, non-reactive liquid of the
coating formulation is believed to evaporate during the poly-
merization of the cyanoacrylate monomer because of its low
heat of vaporization, thus removing the heat of polymeriza-
tion from the applied surface. Further, when said non-sting-
ing, non-irritating, volatile solvent is a siloxane solvent, such
as hexamethyldisiloxane, such compounds that have a low
heat of vaporization (46 cal/ g) generate rapid coating forma-
tion, and hence relief to a user, because of the rapid removal
of the solvent.
When a siloxysilane-containing polymer is added to the
above, a continuous film is introduced that provides greater
skin coverage and adhesion. The siloxysilane polymer also
aids in moisture and oxygen transport through the film to the
damaged skin. These hemostatic coating materials are par-
ticularly useful on slowly bleeding or exudating wounds.
This liquid hemostatic coating can comprise medicants or
other active materials that can be gradually released onto
targeted areas, if desired.
The liquid hemostatic coatings, comprised of the
cyanoacrylate monomer and non-stinging, non-irritating,
volatile solvent, including incorporation of a siloxysilane-
containing polymer, are useful for protecting or treating skin,
nails, tissues, organs and mucous membranes, e.g. bleeding
injuries, surgical sites, skin ulcers, cuts, abrasions, incisions,
cold sores, blisters, rashes, abraded gums and other oral sur-
faces, hemorrhoids and abraded body areas, and other
mucosal membrane incisions and wounds. The liquid adhe-
sive materials may also be used as surgical glues. They also
find application in pediatric care and veterinary care.
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As the liquid hemostatic bandages are non-stinging and
non-irritating and instantly cover exposed nerve endings,
pain is reduced immediately. The bandages remain adherent
to the skin/mucosal surface for up to 2 days or more, relieving
pain and gradually lifting off without creating damage or
irritation.
Compositions
Preferred cyanoacrylate monomers that may be used in this
invention include readily polymerizable alpha-cyanoacry-
lates, including alkyl cyanoacrylates, aryl cyanoacrylates,
alkoxyalkyl cyanoacrylates, such as n-butyl cyanoacrylate,
2-octyl cyanoacrylate, ethyl cyanoacrylate, methyl
cyanoacrylate, n-dodecyl cyanoacrylate, phenyl 2-cy-
anoacrylate, methoxyethyl 2-cyanoacrylate, and the like. The
composition may be composed of one or more polymerizable
cyanoacrylate monomers. The preferred cyanoacrylates are
n-butyl cyanoacrylate and 2-octyl cyanoacrylate, with n-bu-
tyl cyanoacrylate being the most preferred.
Preferably, the cyanoacrylate monomer is present from
about 0.1% to about 99.9% by weight, more preferably, the
cyanoacrylate monomer is present from about 0.1 to about
95% by weight, and most preferably, the cyanoacrylate
monomer is present from about 0.1 to about 90% by weight.
The cyanoacrylate monomers of the invention are incorpo-
rated into a solvent system comprising non-stinging, non-
irritating, volatile, non-reactive liquids, preferably having a
solubility parameter from about 4.9-12.5 (cal/cm3)1/2, pref-
erably from about 5-8 (cal/cm3)1/2. The non-stinging, non-
irritating solvent system can comprise volatile liquid silox-
anes, such as hexamethyldisiloxane (HMDS),
octarnethylcyclotetrasiloxane, decamethylcyclopentasilox-
ane, octamethyltrisiloxanes and the like. The most preferred
non-stinging, non-burning, volatile solvent system is hexam-
ethyldisiloxane. Other volatile solvents, including volatile
alkanes, such as isooctane, octane, neopentane and the like;
volatile fluorocarbons, such as pentafluoropropane, perfluo-
roheptane, perfluoromethylcyclohexane and the like; or a
volatile gas, such as carbon dioxide, can also be employed,
each with varying degrees of user discomfort.
Preferably, the non-stinging, non-irritating, volatile non-
reactive liquid is present from about 0.1% up to 99.9% by
weight, more preferably, the volatile non-reactive liquid is
present from about 5% up to 99.9% by weight, and most
preferably from about 10% to 99.9% by weight.
The use of these non-stinging, non-irritating, volatile, non-
reactive liquids, simply or in combination, as the primary
liquid phase of the liquid coating provides for rapid drying
and less coating tackiness during drying. Notably, the use of
these volatile non-reactive liquids inhibits adhesion of two
surfaces to each other while allowing for good adhesion of the
coating to its applied surface. During evaporation, the volatile
non-reactive liquid solvent, having a low surface energy, is
predominantly found on the air interface or “top” surface of
the coating, hence inhibiting the cyanoacrylate from reaching
Additionally, the use of these non-stinging, non-irritating,
volatile, non-reactive liquids, simply or in combination,
allows for the liquid adhesive coating that contains reactive
cyanoacrylates to be applied by painting, spraying, pumping,
dipping or the like.
n e presence o a s1 oxysi ane-con a1n1ng po ymer, e
siloxysilane-contaimng polymer component of this invention
preferably comprises addition polymerizable siloxysilanes,
which polymers are water vapor and oxygen permeable, and
which monomers may be copolymerized with other non-
US 7,641,893 B2
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cyanoacrylate reactive monomers to form co- or multi-poly-
mers. Water vapor and oxygen permeability, which are pro-
vided by the siloxysilane-containing polymer component, are
important for wound care and prevention of skin/tissue deg-
radation. The water vapor permeability prevents desiccation
and allows for removal of body waste (sweat), while the
oxygen permeability may aid in wound healing.
The siloxysilane monomers of the siloxysilane polymers
include:
3-methacryloyloxypropyltris(trimethylsiloxy)silane (TRIS),
3-methacryloyloxypropylpentamethyldisiloxane,
3-methacryloyloxypropylbis(trimethylsiloxy)methylsilane,
3-methacryloyloxypropyltris(vinyldimethylsiloxy)silane,
3-methacryloyloxymethylbis(trimethylsiloxy)(pentamethyl-
disiloxanyl)silane,
3-methacryloyloxyethyltris(pentarnethyldisiloxanyl)silane,
methacryloyloxymethylbis(trimethylsiloxy)methylsilane
methacryloyloxymethyltris(trimethylsiloxy)silane
3-methacryloyloxypropylheptacyclopentyl-T8-silsesquiox-
ane
3-methacryloyloxypropylheptaisobutyl-T8-silsesquioxane
3-acryloyloxypropylmethylbis(trimethylsiloxy)silane,
3-acryloyloxypropyltris(trimethylsiloxy)silane,
3 -methacryloyloxypropyl -l ,1 ,1 -triphenyl-3 , 3 -dimethyldi si -
loxane,
3-methacrylamidopropyltris(trimethylsiloxy)silane,
3-acrylamidopropyltris(trimethylsiloxy)silane,
p-vinylphenyltris(trimethylsiloxy)silane
p-vinylbenzyltris(trimethylsiloxy)silane,
vinyloxyethyltris(trimethylsiloxy)silane,
vinylnonyldimethyl(trimethylsiloxy)silane,
vinylnonyltris(trimethylsiloxy)silane,
vinylmethylbis(trimethylsiloxy)silane,
vinylpentyldisiloxane,
O-(vinyloxyethyl)-N-(tris[trimethylsiloxy]silylpropyl)ure-
thane,
vinylphenylbis(trimethylsiloxy)silane,
vinyltris(dimethylsiloxy)silane,
vinyltris(trimethylsiloxy)silane,
vinyl-terminated polydimethylsiloxane,
polydimethylsiloxane monoacrylate,
polydimethylsiloxane monomethacrylate,
polymethylphenylsiloxane monoacrylate,
polymethylphenylsiloxane monomethacrylate,
3-acryloyloxypropyltris(polydimethylsiloxanyl)silane,
the like.
These siloxysilane monomers, as polymerized, provide for
solubility in the non-stinging, non-irritating, volatile, non-
reactive, hydrophobic solvent systems of choice.
Other addition polymerizable monomers may also be
incorporated into the siloxysilane-containing polymers of
this invention to modify adhesion, cohesion, flexibility,
toughness, for instance. Examples of these other monomers
are methyl methacrylate, methyl acrylate, tetrahydrofurfuryl
methacrylate, cyclohexyl acrylate, tetrahydrofurfuryl acry-
late, n-lauryl acrylate, n-lauryl methacrylate, 2-phenoxyethyl
acrylate, 2-phenoxyethyl methacrylate, isodecyl acrylate,
isodecyl methacrylate, isooctyl acrylate, isooctyl methacry-
late, isobornyl acrylate, isobornyl methacrylate, benzyl acry-
late, benzyl methacrylate, 2-butoxyethyl acrylate, n-butyl
acrylate, n-butyl methacrylate, ethyl acrylate, ethyl meth-
acrylate, dimethyl itaconate, di-n-butyl itaconate, 2-ethyl-
hexyl acrylate, 2-ethylhexyl methacrylate, furfuryl methacry-
late, n-hexyl acrylate, n-hexyl methacrylate, isobutyl
acrylate, isobutyl methacrylate, isopropyl methacrylate, pen-
tyl acrylate and methacrylate, 2-pentyl acrylate and meth-
acrylate, 3-pentyl acrylate and methacrylate, 2-methyl-l -bu-
and
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tyl acrylate and methacrylate, l-methyl-l-butyl acrylate and
methacrylate, l-methyl-l-pentyl acrylate and methacrylate,
2-methyl-l-pentyl acrylate and methacrylate, 3-methyl-l-
pentyl acrylate and methacrylate, 2-ethyl-l-butyl acrylate
and methacrylate, 2-ethyl- l -hexyl acrylate and methacrylate,
3,5,5-trimethyl-l-hexyl acrylate and methacrylate, 3-heptyl
acrylate and methacrylate, decyl acrylate and methacrylate,
dodecyl acrylate and methacrylate, ot-methylstyrene, p-t-bu-
tylstyrene, 4-methoxystyrene, n-octadecyl acrylate, n-octa-
decyl methacrylate, 2-phenylethyl acrylate, 2-phenylethyl
methacrylate, n-tridecyl methacrylate, vinyl benzoate, vinyl
naphthalene, and the like. In addition, fluorinated siloxanes,
fluorinated itaconates, fluorinated methacrylates or acrylates,
such as hexafluoroisopropyl methacrylate, can be used. Fur-
thermore, dienes such as butadiene or isoprene and their
oligomers, derivatized or not, can be used.
Any hydrophobic or hydrophilic polymerizable monomer
can be used as long as the resulting copolymer has desired
oxygen and water vapor permeability, desired adhesion to its
applied surface, desired cohesion, and non-reactivity with the
cyanoacrylate monomer (until application to the surface) that
is a component of the liquid hemostatic composition of this
invention.
The siloxysilane polymers can be obtained by free radical
polymerization of the monomers utilized, including thermal
free radical polymerization, redox free radical polymeriza-
tion, photoinitiated free radical polymerization, and living
radical polymerization. If desired, block copolymers can be
prepared by living radical polymerization or living anionic
polymerization. Thermal free radical polymerization is pre-
ferred, and an azo free radical initiator is most preferred, such
as 2,2‘-azobis(2-methylbutyronitrile), with polymerization
done between 70-75° C. in the presence of nitrogen.
The siloxysilane-containing polymers of this invention
increase coating flexibility and durability of the applied adhe-
sive coating. Coating flexibility allows use of the coatings of
this invention on flexible areas of the body, e. g., knees, knuck-
les and elbows, as the coating can comfortably flex with body
movement while retaining coating integrity. Durability of the
dried coating on its applied surface for at least 2 days is
desirable.
Non-volatile liquid siloxanes, such as derivatives of pol-
ysiloxanes and the like, may also be used with or without the
siloxysilane-containing polymer of this invention for
increased flexibility and durability of the applied adhesive
coating.
The polymer and monomer components of the invention
are incorporated into a solvent system comprising volatile
hydrophobic liquids, preferably having a solubility parameter
between about 5.0-8.0 (cal/cm3)1/2. Hydrophobic liquids are
defined for the purposes of this invention as being non-water
compatible. The solvent system comprises volatile liquid sili-
cones, such as hexamethyldisiloxane (HMDS), octamethyl-
cyclotetrasiloxane, decamethylcyclopentasil-oxane, octam-
ethyltrisiloxanes and the like. The solubility parameter of
hexamethyldisiloxane is reported to be 5.7 (cal/cm3)1/2 and
that of octamethylcyclotetrasiloxane as 5.4 (cal/cm3)1/2 (see
U.S. Pat. No. 5,103,812, col. 6). The preferred solvent system
is hexamethyldisiloxane. Other volatile solvents, including
volatile alkanes, such as isooctane, octane, neopentane and
the like; volatile fluorocarbons, such as pentafluoropropane,
perfluoroheptane, perfluoromethylcyclohexane and the like;
or a volatile gas, such as carbon dioxide, can also be
Polymer coatings of the invention cast from liquids con-
taining good solvents with solubility parameters of between
9
about 9 to 10 (cal/cm3)1/2 will function, but are generally slow
to dry and remain tacky for extended periods.
e use o t ese non-stinging, non-1rntat1ng, vo at1 e,
hydrophobic liquids, simply or in combination, as the pri-
mary liquid phase of the liquid hemostatic coating provides
for rapid drying and less coating tackiness during drying.
Notably, the use of these volatile hydrophobic liquids inhibits
adhesion of two surfaces to each other while allowing for
good adhesion of the coating to its applied surface for wound
protection and repair. During evaporation, the volatile hydro-
phobic liquid is predominantly found on the air interface or
“top” surface of the coating because of its low surface energy
with air, hence inhibiting the cyanoacrylate monomer from
reaching this surface and reacting to form an adherent bond to
other surfaces that may be present.
The liquid hemostatic coating material, composed of the
siloxysilane-containing polymer, cyanoacrylate monomer
and solvent, is useful for protecting or treating skin, tissues,
organs, nails, hydrated tissues and mucous membranes, e.g.
bleeding injuries, surgical site, skin ulcers, cold sores, cuts,
rashes, abrasions, incisions and blisters, abraded gums and
other oral surfaces, hemorrhoids and abraded body areas, and
other mucosal membrane incisions and wounds. Said coating
materials also find application in pediatric care and veterinary
care.
As the liquid hemostatic bandage is non-stinging and non-
irritating and instantly covers exposed nerve endings, pain is
reduced immediately. The bandage remains adherent to the
skin/mucosal surface for up to 4 days, relieving pain and
gradually lifting off without creating damage or further irri-
tation.
Normal unabraded skin loses moisture vapor at an average
rate of 200 g/m2/day in most areas; the palms of the hand and
soles of the feet respire at an average of 500 g/m2/day. The
siloxysilane-containing polymer liquid hemostatic materials
of this invention have moisture vapor transmission rates of
100 to 200 g/m2/day depending on protective film thickness
(0.001 -0.005 inches), thus preventing both dehydration of the
wounded area and occlusion of body fluids.
Depending on the particular requirements of the user, the
hemostatic compositions of this invention can be applied by
known means, such as with a spray, pump, swab, rod, sterile
brush or medicine dropper. However, in many situations a
pump dispensing package is preferred for the hemostatic
composition of this invention. Other modes of application are
exemplified in U.S. Pat. No. 5,928,611, incorporated by ref-
erence herein in its entirety.
The stability, and thus the shelf-life, of some monomeric
cyanoacrylate hemostatic, adhesive compositions can be fur-
ther enhanced and extended through careful regulation of the
packaging, wherein neither the packaging material nor any
additives cause the spontaneous polymerization of the
cyanoacrylate. In certain instances, however, acidic inhibi-
tors, such as sulfur dioxide, are present in the cyanoacrylate
monomers to prevent spontaneous polymerization.
Other Variations of the Compositions
Other substances may be added to the liquid material or
formulation for additional plasticization, improved adhesion,
or rheology control, and the like, with the proviso that they do
not induce spontaneous polymerization of the cyanoacrylate
monomer.
Typical plasticizer/adhesion promoters are dibutylphtha-
late, acetyl tributyl citrate, sucrose acetate isobutyrate,
sucrose benzoate, acetyltriethyl citrate, mineral oil, decam-
ethylcyclopentasiloxane, octamethylcyclotetrasiloxane, poly
(methyphenylsiloxane), butyl glycolate and others. The plas-
0‘ 1,893 B2
10
ticizing agent preferably contains little or no moisture and
should not significantly affect the polymerization of the
cyanoacrylate monomer. Suitable plasticizers include poly-
meric plasticizers, such as poly(ethylene glycol) (PEG) esters
5 and capped PEG esters or ethers, polyester glutarates and
polyester adipates. Other compositions are exemplified by
U.S. Pat. Nos. 5,259,835 and 5,328,687; 5,981,621; 6,143,
352; 6,565,840; 6,010,714; 6,217,603; and 5,928,611, all
incorporated by reference herein in their entirety.
Typical rheology additives that may be added to the liquid
material or formulation are fumed silica, bentonite and other
clay derivatives, and the like, provided that they do not cause
polymerization of the cyanoacrylate monomer.
The composition may optionally also include thickeners.
Suitable thickeners include, for example, polycyanoacry-
lates, polycaprolactone, polyorthoesters, polyalkyl acrylates,
copolymers of alkyl acrylate and vinyl acetate, poly(alkyl
methacrylate)s, and copolymers of alkyl methacrylates and
butadiene. Examples of alkyl methacrylates and acrylates are
poly(methyl methacrylate), poly(2-ethylhexyl methacrylate)
and poly(2-ethylhexyl acrylate), also poly(butyl methacry-
late) and poly(butyl acrylate), also copolymers of various
acrylate and methacrylate monomers, such as poly(butyl
methacrylate-co-methyl acrylate).
The composition may also optionally include at least a
natural or synthetic rubber or thermoplastic elastomer to
impart impact resistance. Suitable rubbers are known to the
skilled artisan. Such rubbers include, but are not limited to,
Examples of suitable rubbers are disclosed in, for example,
U.S. Pat. Nos. 4,313,865 and 4,560,723, the disclosures of
which are hereby incorporated in their entireties by reference
herein.
T e compositions may a so 1nc u e pH mo 1 ers to contro
the rate of degradation of the resulting polymer, as disclosed
in U.S. Pat. No. 6,143,352, the entire disclosure of which is
hereby incorporated by reference herein in its entirety.
To improve the cohesive strength of adhesives formed from
the compositions of this invention, difunctional monomeric
crosslinking agents in concentration of less than 2 wt % of the
mixture may be added to the monomer compositions of this
invention. Such crosslinking agents are known such as in U.S.
Pat. No. 3,940,362.
The compositions of this invention may further contain
fibrous reinforcement and colorants such as dyes, pigments,
and pigment dyes. Examples of suitable fibrous reinforce-
ment include PGA microfibrils, collagen microfibrils, and
others as described in U.S. Pat. No. 6,183,593, the disclosure
of which is incorporated by reference herein in its entirety.
Examples of suitable colorants as described in U.S. Pat. No.
5,981,621 include 1-hydroxy-4-[4-methylphenylarnino]-9,
10-anthracenedione (FD+C violet No. 2); disodium salt of
6-hydroxy-5-[(4-sulfophenyl)oxo]-2-naphthalenesulfonic
acid (FD+C Yellow No. 6); 9-(o-carboxyphenyl)-6-hydroxy-
2,4,5,7-tetraiodo-3H-xanthen-3-one, disodium salt, monohy-
drate (FD+C Red No. 3); and the like.
The compositions of the present invention may also
include one or more polymerization stabilizers for the
cyanoacrylate monomer, preferably both at least one anionic
vapor phase stabilizer and at least one anionic liquid phase
stabilizer. Such stabilizing agents may also include mixtures
of anionic stabilizing agents and radical stabilizing agents.
These stabilizing agents may inhibit premature polymeriza-
tion. Suitable stabilizers may include those listed in U.S. Pat.
No. 6,183,593, the disclosure of which is incorporated by
reference herein in its entirety. Furthermore, certain stabiliz-
ers may also function as anti-fungal agents.
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Medicants
Medicants may be incorporated into the liquid or solid film
bandages for ready or continual release from the liquid hemo-
static adhesive material components, which allow incorpora-
tion of a variety of medicants, and which are long lasting and
permeable. The addition of a medicant should not facilitate
spontaneous polymerization of the cyanoacrylate monomer
prior to its application to the surface of a user. Examples of
useful medicants are fungicides, antibacterial agents, antivi-
ral agents, cell growth factors, antibiotics, anti-inflammatory
agents, anti-itch agents, anti-infective agents, antitumor
agents, blood pressure and heart regulators, steroids and
many more.
Tissue growth-promoting agents may be incorporated or
suspended into the liquids of this invention to encourage
production of new tissue, adhesion of new tissue, cell migra-
tion, etc., provided that they do not cause the spontaneous
polymerization of the cyanoacrylate monomer. For example,
cytokines, such as epidermal growth factor, transforming
growth factor (TGF)-alpha, TGF-beta and the like, incorpo-
rated into the liquid adhesive film bandage of this invention
may facilitate the re-growth of wounded areas.
As noted above, a biological component may, optionally,
be incorporated within the bandage material. When present,
the biological component can be selected from among a vari-
ety of effectors that, when present at the site of injury, pro-
mote healing and/or regeneration of the affected tissue. In
addition to being compounds or agents that actually promote
or expedite healing, the effectors may also include com-
pounds or agents that prevent infection (e.g., antimicrobial
agents and antibiotics), compounds or agents that reduce
inflammation (e.g., anti-inflammatory agents), compounds
that prevent or minimize adhesion formation, such as oxi-
dized regenerated cellulose, hyaluronic acid, and compounds
or agents that suppress the immune system (e.g., immuno-
suppressants).
Suitable effectors for use with the bandages of the present
invention can also include sources of growth factors, such as
for example, platelets. Platelets are normally found in the
blood and play a role in hemostasis and wound healing.
During clot formation, the platelets become activated and
release growth factors such as PDGF, TGF-[3, VEGF, and IGF.
Platelets can be separated from blood using techniques such
as centrifugation. When platelet rich plasma is combined with
an activator, a platelet clot is created. An activator can be, but
is not limited to, thrombin, adenosine diphosphate (ADP),
collagen, epinephrine, arachidonic acid, Ristocetin, and com-
binations thereof.
Activators useful with this invention may have secondary
therapeutic actions that contribute to the healing process. For
example, Ristocetin not only stimulates platelet aggregation,
but is also an antibiotic. It acts by inhibiting bacterial cell wall
formation and is most efficacious against actively growing
bacteria. Since any invasive procedure has the potential to
induce infection, the benefits of including Ristocetin are two
fold: its presence stimulates clot formation while also provid-
ing a prophylactic action against infection. Gram positive
bacteria such as staphylococcus, known to cause hospital-
bome infection are susceptible to treatment with Ristocetin.
The biological additives can either be dissolved and com-
patible in the liquid hemostatic adhesive formulation or can
remain suspended, provided that they do not cause polymer-
ization of the cyanoacrylate monomer.
Other Applications
The liquid hemostatic adhesive coatings of this invention
could be used for applications other than human or animal
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body care. For instance, the coatings could be used as a
membrane, or part thereof, and, as such, could contain con-
ductive additives or other additives to enhance the membrane
effectiveness. The coatings incorporating a mildewcide could
be used to protect grout in tile surfaces. Other types of active
agents which may be desirable to incorporate include per-
fumes, plant growth regulators, plant insecticides, UV and IR
absorbers, etc. The liquid adhesive coatings of this invention
could also be used to detect latent fingerprint residues or other
residues.
The following examples are offered by way of illustration,
not by way of limitation. While specific examples have been
provided, the above description is illustrative and not restric-
tive. Any one or more of the features of the previously
described embodiments can be combined in any manner with
one or more features of any other embodiments in the present
invention. Furthermore, many variations of the invention will
become apparent to those skilled in the art upon review of the
specification. The scope of the invention should, therefore, be
determined not with reference to the embodiments illustrated,
but instead should be determined with reference to the
appended claims along with their full scope of equivalents.
All publications and patent documents cited in this appli-
cation are incorporated by reference in pertinent part for all
purposes to the same extent as if each individual publication
or patent document were so individually denoted. By their
citation of various references in this document, Applicants do
not admit any particular reference is “prior art” to their inven-
tion.
EXAMPLES
The preparation of the siloxysilane polymers are illustrated
below:
Poly(3 -methacryloyloxypropyltris(trimethylsiloxy)silane
(TRIS)-co-methyl methacrylate-co-isooctyl acrylate
(PSS1)—This terpolymer was obtained by the procedure rep-
resented by U.S. Pat. No. 5,103,812, Example 26.
Poly(3 -methacryloyloxypropyltris(trimethylsiloxy)silane
(TRIS)-co-methyl methacrylate) (PSS2)—This copolymer
was obtained by polymerization of its monomer components
in a 25 ml reaction vessel charged with 6 g ethyl acetate, 1.8
g (0.004 mol) TRIS, 0.2 g (0.002 mol) methyl methacrylate,
and 0.04 g 2,2‘-azobis(2-methylbutanenitrile). The polymer-
ization was run for 21 hours at 72-75° C. The polymer was
precipitated into methanol and dried at 50° C.
Poly(3 -methacryloyloxypropyltris(trimethylsiloxy)silane
(TRIS)-co-n-butyl methacrylate) (PSS3). This copolymer
was obtained by polymerization of its monomer components
in a 25 ml reaction vessel charged with 6 g ethyl acetate, 1.8
g (0.004 mol) TRIS, 0.2 g (0.0014 mol) n-butyl methacrylate
and 0.04 g 2,2"-azobis(2-methylbutanenitrile. The polymer-
ization was run for 21 hours at 72-75° C. The polymer was
precipitated into methanol and dried at 50° C.
Example 1
Butyl Cyanoacrylate Tested with Disiloxane Liquid
n-Butyl cyanoacrylate (BCA) was mixed into hexameth-
yldisiloxane (HMDS) at about a one to one volume ratio.
When this formulation was pipetted onto a glass slide and
covered with another glass slide, the cyanoacrylate polymer-
ized as verified by formation and adhesion of the polymer
onto the first applied glass slide. The polymerized cyanoacry-
late containing HMDS did not provide adequate adhesion to
a second covering slide to prevent the two glass slides from
being readily pulled apart.
US 7,641,893 B2
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Additionally, a test was conducted for the rate of polymer-
ization as a function of solvent concentration in order to
assess the time interval for heat generation upon the polymer-
ization of the cyanoacrylate monomer. The mixture included
n-butyl cyanoacrylate in the presence and absence of hexam-
ethyldisiloxane. According to U.S. Pat. No. 6,010,714, which
utilized a heat dissipating agent in the presence of a
cyanoacrylate monomer, the heat dissipating agent did not
affect the rate of polymerization. Utilizing a glass slide con-
taining BCA with no HMDS as the control, polymerization of
this neat system occurred in 25 seconds. When a 20% BCA
solution in HMDS was studied, utilizing the same amount of
BCA as in the control, polymerization occurred in 40 sec-
onds, and decreased the polymerization rate by 60%. Further,
when a 5% solution of BCA in HMDS was studied, polymer-
ization occurred in 89 seconds, and this dilution decreased the
polymerization rate by 256%. Thus, the addition of the non-
stinging, non-irritating volatile hexamethyldisiloxane sol-
vent caused polymerization of the cyanoacrylate to occur at a
slower rate than that reported by U.S. Pat. No. 6,010,714,
allowing the heat of polymerization to be more evenly dissi-
pated. It was also found that the addition of the HMDS sol-
vent, which has a low critical surface tension, allowed the
BCA mixture to flow readily over the glass surface, whereas
the BCA by itself tended to bead because of its higher critical
surface tension. The use of the HMDS would thus facilitate
rapid coverage of a wound site.
Examples 2-6
Butyl Cyanoacrylate Tested with Disiloxane Liquid
n-Butyl cyanoacrylate was mixed into hexarnethyldisilox-
ane at various concentrations by weight. Hemostasis ability
was tested by pipetting 5 pl of pork blood on a microscope
slide immediately followed by pipetting 5 pl of the liquid
hemostatic composition directly on top of the blood droplet.
In addition to hemostasis testing, adhesion of two surfaces
that are pressed together in the presence of the compositions
was tested. 5 pl of the compositions was pipetted onto a glass
slide, allowed to dry/react for about 10 seconds, and then
another glass slide was pressed onto the coated first slide.
After about 1 minute, force was applied to the glass slides to
pull them apart.
In Examples 2 and 3 with BCA concentrations 30% and
less, the BCA adhered well to its applied glass surface but did
not adhere to a second glass surface that was pressed onto the
first applied glass surface. Examples 4-6 demonstrate the
inherent capability of BCA to adhere two surfaces to each
other when inadequate amounts of the non-stinging, non-
irritating, volatile, non-reactive liquid are present, that is, at
concentrations of BCA of 50% and greater.
BCNHMDS Adhesion to two
Ex (wt %) Hemostasis Ability glass surfaces
2 10 coagulation no
3 30 coagulation no
4 50 explosive coagulation yes
5 80 explosive coagulation yes
6 100 (no HMDS) explosive coagulation yes
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Examples 7-1 1
Testing of octyl cyanoacrylate/polysiloxysilane
solution (SOL1)
2-Octyl cyanoacrylate (OCA) was mixed with a solution
containing poly(3-methacryloyloxypropyltris(trimethylsi-
loxy)silane-co-methyl methacrylate-co-isooctyl acrylate)
(PSS1), polyphenylmethylsiloxane and hexamethyldisilox-
ane. This solution shall be abbreviated as SOL1 (solution one)
in the following references. The resultant liquid adhesives
were cast onto TeflonTM sheet and evaluated for film forming
characteristics as shown in the following chart.
OCNSOL1 OCNSOL1 Film Integrity as
Ex (grams) (solids, by parts) cast on Teflon TM
7 0.08/0.91 1:1 film contracts, forms holes
8 0.07/0.14 10:1 film contracts, forms discreet
clumps
9 0.02/2.19 1:10 film conforms to Teflon TM
10 0.02/ 1.04 1:5 film contracts slightly,
conforms to Teflon TM
11 0.00/1.2 0:1 film conforms to Teflon TM
With higher concentrations of polysiloxysilane to 2-octyl
cyanoacrylate than 1:1 (comparison of Example 7 with
Examples 9 and 10), the film forming characteristics on
TeflonTM of the solution are good. The dried solutions con-
form to the substrate and form a continuous film. Example 11
illustrates the coating of solution 1 by itself.
Examples 12-16
Testing of butyl cyanoacrylate/polsiloxysilane
solution (SOL1)
n-Butyl cyanoacrylate (BCA) was mixed into the polysi-
loxysilane-co-methyl methacrylate-co-isooctyl acrylate ter-
polymer solution (SOL1) at four different weight percentages
based on percent solids. These liquid adhesive compositions
were then tested.
Hemostasis ability was tested by pipetting 5 ul of beef
blood on a microscope slide immediately followed by pipet-
ting 15 pl of the liquid adhesive composition directly on top of
the blood droplet. A “yes” result indicates the blood droplet
coagulated in the presence of the added coating.
Adhesion to skin was tested by pipetting 10 pl of the liquid
adhesive composition onto a human forearm which had pre-
viously been stained with blue food coloring dye. The blue
food coloring dye is water soluble and, hence, is readily
washed off upon exposure to water (shower, washing dishes,
etc). The liquid adhesive compositions, which were applied
on top of the dried blue food coloring, prevent washing off of
the blue food coloring. Once the liquid adhesive composi-
tions are no longer present on the forearm, the blue food
coloring is readily washed off. Adhesion of the liquid adhe-
sives was determined by the presence of blue food coloring
dye.
BCA to SOL1 Forearm Adhesion
Ex (wt % of solids) Hemostasis Ability (days)
12 0 no coagulation 4
13 9 coagulated top surface of 3
blood
US 7,641,893 B2
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-continued
BCA to SOL1 Forearm Adhesion
Ex (wt % of solids) Hemostasis Ability (days)
14 20 coagulated more blood 4
15 30 instant coagulation 4
16 100 explosive coagulation 2
With this series of tests, Example 15 provided good results
with forearm adhesion of 4 days and instant blood coagula-
tion. Examples 13 and 14 are also useful as liquid adhesive
bandages with gentle hemostasis requirements. It should be
noted that n-butyl cyanoacrylate, by itself (Example 16),
coagulates blood explosively with considerable burning and
remains intact on human forearm skin for only 2 days. For
solution 1 with no BCA, no hemostasis was observed.
Examples 17-20
Aging Studies
n-Butyl cyanoacrylate or 2-octyl cyanoacrylate was mixed
into the polysiloxysilane solution (SOL1) and placed into a
container which was non-reactive with the cyanoacrylates.
Various weight percentages of the cyanoacrylate (CA) mono-
mer to the polysiloxysilane were evaluated for longer term
compatibility and stability of the cyanoacrylate monomers.
The mixed solutions were held at room conditions (20° C.) for
an extended period of time and tested at Day 1, Month 2, and
Month 5 by pipetting a 10 it] drop from each of the solutions
onto a drop of beef blood. Hemostasis ability was determined
by whether or not the beef blood clotted upon contact with the
mixed solution. Skin adhesion was determined by pipetting
15 ul of each of the mixed solutions, after they had been stored
for 5 months at 20° C., onto a human forearm.
CNSOL1 Skin
(wt % Hemostasis Abilig Adhesion Ability
Ex ofsolids) Day 1 Month 2 Month 5 Month 5
17 16 wt % BCA yes yes yes 7 days
18 6.5 wt % BCA yes yes yes 7 days
19 16 wt % OCA yes no no 7 days
20 6.5 wt % OCA yes no no 6 days
Examples 17 and 18 were stable for at least 5 months of
aging as observed by continued hemostasis capability and
skin adhesion remaining high for 7 days duration.
Examples 21-25
MVTR Testing
n-Butyl cyanoacrylate or 2-octyl cyanoacrylate was mixed
into the polysiloxysilane solution (SOL1) and tested for
moisture vapor transmission rate (MVTR) and dirt pick-up.
Moisture vapor transmission rate was determined by the
rate water vapor passed through 1 .5-2.7 mil thick films over a
period of three days.
Dirt pick-up was determined by pipetting 0.25 it] of liquid
adhesive onto a glass slide, drying the adhesive followed by
dipping the slide into topsoil and waving it back and forth
several times. The slides were then examined under a micro-
scope for dirt particle pick-up.
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Burst strength was determined by casting films of the liquid
adhesives in Mason jar bands to produce dried film thickness
between 1.5 and 3 mils. Weights were deposited on top of
each the films until the film cracked or broke. The higher the
weight load required for burst, the higher the cohesive
strength of the film. Burst strength (cohesive strength) was
increased by 50% with the addition of BCA to the polysilox-
ysilane (comparison of Examples 21 and 22 with Example
25) due, at least in part, to formation of an interpenetrating
polymer network.
MVTR
CNSOL1 (grams/ Dirt pick-up Burst Strength
Ex (% of solids) meter2/day) (particle number) (grams)
21 16wt%BCA 192 37 318
22 6.5 wt % BCA 142 300
23 16 wt % OCA 100
24 6.5 wt % OCA 104
25 0 wt % BCA 164 73 200
Dirt pick-up is substantially reduced by the addition of
BCA to the polysiloxysilane solution (SOL1) (Examples 21
and 25). Moisture vapor transmission rates (MVTR) of
Examples 21-24 remain in the same range as Example 25, the
polysiloxysilane by itself. The polysiloxysilane (PSS1) is
known for its good moisture vapor transmission rate and,
hence, its acceptability as a liquid adhesive bandage. Such a
product is sold commercially as Nexcare Spray Liquid Ban-
dage by 3M Consumer Health Care, St. Paul, Minn. 55144-
1000. Therefore, it is a positive result that the MVTRS remain
high with the cyanoacrylate-containing compositions of this
invention.
Examples 26-28
Hemostasis and Adhesion Testing
Adhesion of two surfaces that are pressed together in the
presence of the compositions was tested in the following
manner. 15 ul of the compositions was pipetted onto a glass
slide, allowed to dry/react for about 10 seconds, and then
another glass slide was pressed onto the coated first slide.
After about 5 minutes, force was applied to the glass slides to
pull them apart. The same procedure was used with human
fingers except only 5 ul of the compositions was tested.
Hemostasis ability testing was conducted as in Examples
17-20.
Examples 27 and 28 contain the non-stinging, non-irritat-
ing, volatile hydrophobic liquid HMDS, hence, preventing
adhesion of two surfaces. Whereas, example 26 does not
contain the volatile hydrophobic liquid and adhesion to two
surfaces does occur.
Adhesion of
BCA two surfaces
Ex (% of solids) Hemostasis Ability Glass Human fingers
26 100% BCA explosive coagulation yes yes
27 32% BC/VSOL1 coagulation no no
28 16% BCNS OL1 coagulation no
US 7,641,893 B2
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Examples 29-33
Hemostasis and Adhesion Testing
n-Butyl cyanoacrylate was mixed into the polysiloxysilane
solution (SOLI) and was further tested for hemostasis ability
and adhesion with a broader range of formulations containing
larger quantities of BCA in relation to the polysiloxysilane
solution. Hemostasis ability and adhesion to two surfaces
testing was conducted as in Examples 17-20 and Examples
26-28.
Adhesion of
two surfaces
BCA Human
Ex (% of solution by wt) Hemostasis Ability Glass fingers
29 10% BC/VSOLI coagulation no no
(50% BCA by %
solids)
30 25% BC/VSOLI coagulation sligit no
31 30% BC/VSOLI coagulation sligit no
32 40% BC/VSOLI explosive coagulation mo erate
33 50% BC/VSOLI explosive coagulation yes
Compositions containing 40% BCA or lower (Example
29-32) provided good blood coagulation while inhibiting
adhesion of glass or human fingers to each other. At higher
BCA loadings, explosive blood coagulation occurred and
glass surfaces were adhered together (such as Example 33),
which probably indicates human skin and tissue surfaces
would also adhere to gether if inadvertently touching the com-
position.
Examples 34-38
Testing of cyanoacrylate/polsiloxysilane solution
(SOL2)
n-Butyl cyanoacrylate (BCA) was mixed in various por-
tions with a solution containing poly(3-methacryloyloxypro-
pyltris(trimethylsiloxy)silane-co-methyl methacrylate)
(PSS2) and hexarnethyldisiloxane. This polysiloxysilane
solution shall be abbreviated as SOL2 (solution two) in the
following references. The formulations were tested as fol-
lows.
Tack was determined by rubbing an index finger lightly
over dried polymer coating on glass slide and rating on a scale
from 0 to 5 (0:slippery, l:smooth, 2:smooth with slight
resistance, 3:resistance, 4:resistance with slight stickiness,
5:sticky).
Hemostasis ability was tested by pipetting 5 pl of beef
blood on a microscope slide immediately followed by pipet-
ting 5 pl of the liquid hemostatic adhesive composition
directly on top of the blood droplet. A “yes” result indicates
the blood droplet coagulated in the presence of the added
hemostatic composition.
Adhesion to skin was tested by pipetting 10 pl of the liquid
hemostatic adhesive composition onto a human forearm that
had previously been stained with yellow food coloring dye.
The yellow food coloring dye is water soluble and, hence, is
readily washed off upon exposure to water (shower, washing
dishes, etc). The liquid hemostatic adhesive composition,
which was applied on top of the dried yellow food coloring,
prevents washing off of the yellow food coloring. Once the
liquid hemostatic adhesive composition is no longer present
l0
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on the forearm, the yellow food coloring is readily washed
off. Adhesion of the hemostatic composition was determined
by the presence of yellow food coloring dye.
BCA to SOL2 Forearm Adhesion
Ex (wt % of soln.) Tack Hemostasis Ability (days)
34 5 1 yes, fluid
35 10 1 yes
3 6 15 1 yes
37 20 1 yes, crusty
3 8 30 1 yes, crusty 3
With this series of tests, Examples 35-38 provided good
results with forearm adhesion of 3 days (Example 38), low
tack and instant blood coagulation. Example 34 is also useful
as liquid adhesive bandage with gentle hemostasis require-
ments.
Examples 39-43
Testing of cyanoacrylate/polsiloxysilane solution
(SOL3)
n-Butyl cyanoacrylate (BCA) was mixed with a solution
containing poly(3-methacryloyloxypropyltris(trimethylsi-
loxy) silane-co -n-butyl methacrylate (PSS3) and hexamethyl-
disiloxane. This polysiloxysilane solution shall be abbrevi-
ated as SOL3 (solution three) in the following references. The
formulations were tested as in Examples 34-38.
BCA to SOL3 Forearm Adhesion
Ex (wt % of soln.) Tack Hemostasis Ability (days)
39 5 1 yes,
40 10 1 yes
41 15 1 yes
42 20 1 yes
43 30 1 yes, crusty 2
With this series of tests, Examples 39-43 provided reason-
able results with forearm adhesion of 2 days (Example 43),
low tack and instant blood coagulation.
Examples 44-47
Butyl Cyanoacrylate Tested with Hydrocarbon
Liquid
n-Butyl cyanoacrylate (BCA) was mixed into 2,2,4-trim-
ethylpentane (TMP), a volatile, non-reactive hydrocarbon, to
form liquid adhesive compositions. These liquid adhesive
compositions were then tested. Hemostasis ability was tested
by pipetting 5 pl of pork blood on a microscope slide imme-
diately followed by pipetting 5 pl of the liquid adhesive com-
position directly on top of the blood droplet.
In addition to hemostasis testing, adhesion of two surfaces
that are pressed together in the presence of the compositions
was tested. 5 ul of the compositions was pipetted onto a glass
slide, allowed to dry/react for about 10 seconds, and then
another glass slide was pressed onto the coated first slide.
After about 1 minute, force was applied to the glass slides to
pull them apart.
The data suggest that at cyanoacrylate concentrations
above 50% (Examples 46 and 47), the positive benefits of
incorporated volatile, non-reactive liquid are diminished.
US 7,641,893 B2
19
Below 50% BCA concentration in TMP (Examples 44 and
45), two glass surfaces do not adhere to each other when the
liquid adhesive composition is applied, although the desired
result of hemostasis does occur.
BCNTMP Adhesion to two
Ex (wt %) Hemostasis Ability glass surfaces
44 13.5 coagulation no
45 30 coagulation no
46 50 explosive coagulation yes
47 80 explosive coagulation yes
Examples 48-50
Testing of Butyl cyanoacrylate/polysiloxysilane in
2,2,4-trimethylpentane
Butyl cyanoacrylate (BCA) was mixed at various concen-
trations with a solution containing poly(3-methacryloylox-
ypropyltris(trimethylsiloxy)silane-co-methyl methacrylate-
co-isooctyl acrylate) (PSS1) and 2,2,4-trimethylpentane
(TMP). The polymer was dissolved at 10 wt % solids into the
2,2,4-trimethylpentane solvent. Hemostasis ability and adhe-
sion to two surfaces testing was conducted as in Examples
17-20 and Examples 26-28.
Adhesion of
BCA two surfaces
Ex (% of solution by wt) Hemostasis Ability Glass
48 8% BC/VPSS1/TMP coagulation no
(40% BCA by % solids)
49 27% BC/VPSS1/TMP coagulation moderate
50 35% BC/VPSS1/TMP explosive coagulation yes
With this volatile solvent, less than 35% BCA in the pol-
ysiloxysilane solution is necessary to provide non-explosive
coagulation (Examples 48 and 49). Below 27% is needed to
also have non-adhesion of two surfaces (Example 48).
Other Embodiments
The above examples are representative of specific embodi-
ments of the present invention. However, many variations are
possible. In all forms, the liquid hemostatic coating material
of this invention comprises a reactive cyanoacrylate mono-
mer and a solvent system comprising a volatile, non-reactive
liquid and which can further comprise a polymer component
containing siloxysilane functional groups. In all cases the
invention provides a method of forming a hemostatic coating
on a surface by applying a liquid monomeric cyanoacrylate or
a liquid monomeric cyanoacrylate with or without a polysi-
loxysilane, in an inert volatile solvent, to a surface, which
may be bloody; and volatilizing the solvent system, while
concurrently polymerizing the cyanoacrylate and attaching it
to the applied surface. In the presence of the polysiloxysilane,
an interpenetrating network is presumably formed, generat-
ing a strong, cohesive film. For these systems, the cyanoacry-
late attaches to the applied surface providing hemo static func-
tion and the evaporation of the volatile solvent from the
coating formulation prevents adhesion of the cyanoacrylate to
a second surface.
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REFERENCES
. application Ser. No. 09/430,289 filed Oct. 29, 1999
O
. Pat. . 6,746,667 Badejo, et al.
C. Davis, W. H. Eaglstein, A. L. Cazzaniga, P. M. Mertz,
Dermatologic Surgery, 2001, 27, pp 783-788.
W. H. Eaglstein, T. P. Sullivan, P. A. Giordano, B. M. Miskin,
Dermatologic Surgery, 2002, 28, pp 263-267.
A. J. Singer, L. Berrutti, S. A. McClain, Wound Repair and
Regeneration, 1999, 7, pp. 356-361.
A. J. Singer, M. Nable, P. Cameau, D. D. Singer, S. A.
McClain, Wound Repair and Regeneration, 2003, 11, pp.
1 81-1 87.
C. Vauthier, C. Dubemet, E. Fattal, H. Pinto-Alphandary, P.
Couvreur, Advanced Drug Delivery Reviews, 55, Issue 4,
pp 5 1 9-548.
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S.
What is claimed is:
1. A liquid coating material comprising about 0.5 to about
50 wt % polymerizable cyanoacrylate monomer and about 10
to about 99.9 wt % of a volatile liquid selected from the group
consisting of volatile linear and cyclic siloxanes, volatile
polydimethylsiloxanes, isooctane, octane, and combinations
thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere to a second glass
surface, when:
(i) the liquid coating material is applied to a first glass
surface, and
(ii) the second glass surface is applied to the first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating when applied to a surface, wherein said
volatile liquid volatilizes at room or body temperature.
2. A liquid coating material in accordance with claim 1,
wherein said polymerizable cyanoacrylate monomer compo-
nent comprises alpha-cyanoacrylates.
3. A liquid coating material according to claim 2, wherein
said alpha-cyanoacrylate monomer component comprises at
least one of: n-butyl cyanoacrylate and 2-octyl cyanoacrylate.
4. A liquid coating material according to claim 1, wherein
the volatile liquid comprises a liquid selected from the group
consisting of hexamethyldisiloxane, octamethylcyclotetrasi-
loxane, decamethylcyclopentasiloxane, octamethyltrisilox-
anes and combinations thereof.
US 7,641,893 B2
21
5. A liquid coating material according to claim 1, compris-
ing: hexamethyldisiloxane as the volatile liquid.
6. A liquid coating material comprising about 0.5 to about
50 wt % polymerizable cyanoacrylate monomer and about 10
to about 99.9 wt % of a volatile liquid selected from the group
consisting of volatile linear and cyclic siloxanes, volatile
polydimethylsiloxanes, isooctane, octane, and combinations
thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere to a second glass
surface, when:
(i) the liquid coating material is applied to a first glass
surface, and
(ii) the second glass surface is applied to the first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating when applied to a surface.
7. A liquid coating material comprising about 0.5 to about
50 wt % polymerizable cyanoacrylate monomer and about 10
to about 99.9 wt % of a volatile liquid selected from the group
consisting of volatile linear and cyclic siloxanes, volatile
polydimethylsiloxanes, isooctane, octane, and combinations
thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere to a second glass
surface, when:
(i) the liquid coating material is applied to a first glass
surface, and
(ii) the second glass surface is applied to the first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating upon polymerization of the aipha-cy-
anoacrylate monomer and volatilization of the non-re-
active solvent when said coating is applied to a surface,
wherein said volatile liquid volatilizes at room or body
temperature.
8. A liquid coating material in accordance with claim 7,
comprising n-butyl cyanoacrylate as the cyanoacrylate
monomer and hexarnethyldisiloxane as the volatile solvent.
9. A kit comprising: a liquid coating material comprising
about 0.5 to about 50 wt % polymerizable cyanoacrylate
monomer and about 10 to about 99.9 wt % of a volatile liquid
selected from the group consisting of volatile linear and
cyclic siloxanes, volatile polydimethylsiloxanes, isooctane,
octane, and combinations thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere to a second glass
surface, when:
(i) the liquid coating material is applied to a first glass
surface, and
(ii) the second glass surface is applied to the first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating when applied to a surface, wherein said
volatile liquid volatilizes at room or body temperature.
10. A kit accordance with claim 9, wherein said polymer-
izable cyanoacrylate monomer component comprises alpha-
cyanoacrylates, wherein said aipha-cyanoacrylate monomer
component comprises at least one of: n-butyl cyanoacrylate
and 2-octyl cyanoacrylate.
11. A kit comprising: a liquid coating material comprising
about 0.5 to about 50 wt % polymerizable cyanoacrylate
monomer and about 10 to about 99.9 wt % of a volatile liquid
5
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selected from the group consisting of volatile linear and
cyclic siloxanes, volatile polydimethylsiloxanes, isooctane,
octane, and combinations thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere to a second glass
surface, when:
(i) The liquid coating material is applied to a first glass
surface, and
(ii) the second glass surface is applied to the first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating when applied to a surface.
12. A liquid coating material comprising about 0.5 to about
50 wt % polymerizable cyanoacrylate monomer and about 10
to about 99.9 wt % of a volatile liquid selected from the group
consisting of volatile liner and cyclic siloxanes, volatile poly-
dimethylsiloxanes, and combinations thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere first and second
glass surfaces, when:
(i) the liquid coating material is applied to a first glass
surface, and
(ii) a second glass surface is applied to The first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating when applied to a surface.
13. A kit comprising: a liquid coating material comprising
about 0.5 to about 50 wt % polymerizable cyanoacrylate
monomer and about 10 to about 99.9 wt % of a volatile liquid
selected from the group consisting of volatile linear and
cyclic siloxanes, volatile polydimethylsiloxanes, and combi-
nations thereof,
said volatile liquid being present in an amount such that the
liquid coating material does not adhere to a second glass
surface, when:
(i) the liquid coating material is applied to a first glass
surface, and
(ii) the second glass surface is applied to the first glass
surface, having the liquid coating material disposed
there between,
said coating material forming an adherent, conformable
polymer coating when applied to a surface.
14. The liquid coating material of claim 1, wherein the
volatile liquid is selected from the group consisting of volatile
linear and cyclic siloxanes, volatile polydimethylsiloxanes,
and combinations thereof.
15. The liquid coating material of claim 6, wherein the
volatile liquid is selected from the group consisting of volatile
linear and cyclic siloxanes, volatile polydimethylsiloxanes,
and combinations thereof.
16. The liquid coating material of claim 7, wherein the
volatile liquid is selected from the group consisting of volatile
linear and cyclic siloxanes, volatile polydimethylsiloxanes,
and combinations thereof.
17. The kit of claim 9, wherein the volatile liquid is selected
from the group consisting of volatile linear and cyclic silox-
anes, volatile polydimethylsiloxanes, and combinations
thereof.
18. The kit of claim 11, wherein the volatile liquid is
selected from the group consisting of volatile linear and
cyclic siloxanes, volatile polydimethylsiloxanes, and combi-
nations thereof.
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