Styrenic block-copolymer polymerizable surfactants, when engaged in emulsion polymerization of core−shell acrylic latexes, are forming copolymers containing a large majority of monomer units. These copolymers can be extracted, and analyzed, after extensive washing of the particles by ultrafiltration.
The invention relates to a method of applying a nailwrap to a human nail. The method includes depositing an effective amount of a polymerization catalyst on the nailwrap, placing the nailwrap on a portion of the nail, and depositing a first layer of a monomer over the nailwrap to simulate a human nail. By depositing the polymerization catalyst on the nailwrap, polymerization of the monomer occurs from the bulk, i.e., the surface of the human nail, and proceeds to the surface of the artificial nail structure.
A nail tip adhesive is made by the process of mixing cyanoacrylate and a vitamin fortifier in a proportion by weight in the range of 0.0001% to 0.1% vitamin-to-cyanoacrylate, wherein the shelf life of the cyanoacrylate is at least not substantially shortened by adding such vitamin. Such vitamin fortifier comprises at least one of vitamin A, vitamin D-3, vitamin E, vitamin K, vitamin B-1, vitamin B-2, vitamin B-6, vitamin B-12, vitamin C, niacinamide, folic acid, panthothenic acid, and biotin.
The photoinitiated polymerization of ethyl cyanoacrylate (ECA) by benzyl triphenylphosphonium hexafluoroantimonate (BP+) and (anthracen-9-ylmethyl)triphenylphosphonium hexafluoroantimonate (MAP+) was studied. Zwitterionic and free radical mechanisms which involved homolytic and heterolytic decomposition of the phosphonium salts are discussed. The anthracene-sensitized photopolymerization of ECA was also demonstrated.
A xanthate derived photoinitiator, S-methacryloyl O-ethyl xanthate (MAX) bearing an electron-deficient polymerizable double bond has been found to be capable of distinguishing MMA and styrene, thereby dictating their polymerization pathways in distinctly different and controlled fashion. The structure, molecular weight, and the polydispersity of each polymer have been determined by spectral analysis and size-exclusion chromatography (SEC).
Polycyanoacrylates were found to be inherently unstable. Even in the absence of a deliberately added strong base, their molecular weights decreased drastically on standing in solution in accord with observations by Ryan and McCann (Makromol Chem Rapid Commun 1996, 17, 217). The initial high molecular weight polymer disappeared over the course of a few hours in solution and was replaced by a much lower molecular weight material.
A non-environmentally hazardous, non-volatile adhesive promoter composition useful in promoting the cure and/or enhancing adhesion of adhesives and for use in combination with adhesive bond polymerization. The promoter composition is a combination of a fluid carrier that remains substantially present during the curing of an adhesive composition and an active component capable of promoting the cure and/or enhancing adhesion of the adhesive and being miscible in the fluid carrier.
Five 1-O-methyl-4,6-O-ben- zylidene derivatives of the monosac- charides d-glucose, d-galactose, and d- mannose were synthesized. The b-iso- mer of the d-glucose derivative was sparingly soluble in most organic sol- vents, whereas the a-isomer of the d- mannose derivative was soluble in many organic solvents. The a-isomer of the d- glucose derivative and the a- and b- isomers of the d-galactose derivative acted as versatile gelators of various organic solvents ; this indicates that sac- charides are useful as potential tem- plates for the molecular design of chiral gelators.
Bei Verwerdung von Gel-bildnden Kondensationsprodukten von Aldehyden bzw. Ketonen mit Polyolen in Cyanacrylaten erhält man frombeständige Klibstoffe, Beschichtungs- und Dichtungsmassen. Sie sind lagerstabil und eignen sich vor allem zum Verkleben von porösen Substraten wie Papier oder Holz. Die Handhabung ist besonders einfach, wenn man abreibbare Klebestifte formt.
The concept of channels has been with us more than a century. For half a century, biologists have studied the remarkable workings of protein and peptide channels that permit various cations and small molecules to pass through the phospholipid bilayer membrane. During the past decade, attempts have been made by chemists and biochemists to examine the action of channel compounds from the chemical point of view and to model their function using synthetic structures.
