C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
31/21, 167/300,
C08F 220/06 (2006.01) A61K 8/81 (2006.01) A61Q 19/00 (2006.01) C07C 69/54 (2006.01) C08F 220/12 (2006.01) C08F 299/02 (2006.01) C09K 8/035 (2006.01) C11D 3/37 (2006.01) D06P 1/52 (2006.01)
Patent
CA 1188043
Abstract of the Disclosure Stable, aqueous dispersions of water-insoluble methacrylic acid emulsion copolymers of (1) about 20 to 50% by weight of at least one member selected from the group consisting of methacrylic acid and acrylic acid, (2) about 0.5 to 25 weight percent of a (meth)acrylate of the formula R°-O-(EO)n-C(O)-C(R)=CH2 wherein R° is a member selected from the group consisting of alkyl, alkylaryl, and polycyclic alkyl groups having 8 to 30 or more carbon atoms, E is -CH2CH2-, R is H or CH3, and n is an integer having a value of at least 2, and (3) at least 30 weight percent, to make 100%, of at least one alkyl (meth)acrylate wherein the alkyl group has 1-4 carbon atoms. Optionally, a small amount, 0.05 to about 1% by weight, based on the total weight of the monomers of a polyethylenically unsaturated monomer may be included. The (meth)acrylic acid emulsion copolymers when neutralized and solubilized by addition of an alkali are high efficiency thickeners for aqueous systems and have improved tolerance to ionic or electrolyte content. Typical systems that can be thickened are paint latices, cosmetic preparations, food preparations, ionic detergents, dye pastes for textiles, pharmaceuticals, and oil well drilling muds. Surfactants enhance the thickening afforded by the copolymers. Certain of the (meth)acrylic acid emulsion copolymers when neutralized and solubilized by addition of an alkali are useful at low levels to provide improved flow and leveling properties whereby high film build aqueous coatings are obtained.
342401
Chang Ching-Jen
Stevens Travis E.
Gowling Lafleur Henderson Llp
Rohm And Haas Company
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