Patent

Die Erfindung betrifft ein mit Polycyanacrylat umhülltes Pigment sowie ein Verfahren zur Umhüllung von Pigmenten.

Alpha-cyanoacrylate adhesives of fluorescent color having incorporated therein at least one member selected from C.I. Solvent Green 5; C.I. Acid Red 50 and C.I. Acid Red 52.

A cyanoacrylate-based adhesive composition is disclosed. The cyanoacrylate-based adhesive composition includes a cyanoacrylate monomer, and a bleachable dye including a Michler's hydrol cation or derivatized Michler's hydrol cation, paired with a non-nucleophilic anion that provides a stable color to the cyanoacrylate-based adhesive.

Water-borne pollutants, particularly those of oelaginous nature, may be treated with monomers which polymerize in the presence of moisture, preferably, monomeric esters of 2-cyanoacrylic acid. Upon polymerization, significant portions of the pollutant are incorporated within a polymer matrix, thus reducing the danger to shore and marine ecology and aesthetics.

A method for applying a polymeric resist coating of very high molecular weight to a suitable substrate without the necessity of elaborate purification steps and for ensuring adequate coverage of raised regions in three-dimensionally patterned substrates. The method comprises exposing the substrate to be coated to the vapor of an anionically polymerizable monomer of the formula: CHR=CXY where X and Y are strong electron withdrawing groups R si H or, provided that X and Y are both -CN,C1-C4 alkyl for sufficient time to deposit a polymerizable coating thereon.

Curable compositions that comprise two separately curable chemistry sets or compositions with curing temperatures sufficiently separated so that one chemistry composition can be fully cured during a B-staging process, and the second can be left uncured until a final cure is desired, such as at the final attach of a semiconductor chip to a substrate.

An adhesive compostion, of the 'instant adhesive' type, comprising:

(a) from 77 to 95% by wight of monomeris 2'-ethoxyethyl 2 cyanoacrylate;

(b) from 3 to 15% by wight of a poly-(C1-5) alkyl acrylate of methacrylate having an average molecular wight within the range from 400,000 to 600,000;

(c) from 2 to 8% by wights of hydrophobic fumed silica; and

(d) from 100 to 1000 ppm by wight of a polymerization stabilizer;

A cyanoacrylate adhesive composition in thixotropic paste form is made by mixing a liquid cyanoacrylate ester with powdered organic fillers selected from (i) polycarbonates, (ii) polyvinylidene fluorides, (iii) polyethylenes, and (iv) acrylic block copolymer resins containing saturated elastomer segments. Concentration of the filler is about 5 to 100 parts by weight. Particle size of the filler is about 2 to 200 microns.

A method of injection moulding or extruding an article is disclosed in which a ceramic and/or metallic powder is dispersed in a carrier to form a flowable composition. The carrier is preferably a monomeric cyanoacrylate which is reversibly polymerisable so as to yield a solid polymer, which in turn is capable of undergoing a thermally activated depolymerisation reaction so as to yield the monomeric species. The composition is injected into a mould or extruded through a die and the carrier polymerised in the mould or die.

An adhesive cement is prepared by coating an aluminosilicate glass ionomer with an acid polymerization inhibitor of pKa between 2-3.5, and then mixing the treated glass with cyanoacrylate monomer and water. The glass is treated by dissolving the acid, typically tartaric, tartronic, malic, maleic or mellitic acid in methanol and adding the glass powder to form a slurry, then evaporating the methanol.