WATER-BORNE ACRYLIC EMULSION PRESSURE SENSITIVE LATEX ADHESIVE COMPOSITION

摘要

The present invention is directed to an aqueous emulsion acrylic pressure sensitive adhesive composition that excels in high performance applications. The inventive adhesive composition comprises in water (a) a copolymer of a C4-C18 alkyl (meth)acrylate monomer and between about 0.1 % and 5 % N-substituted or unsubstituted (poly)acrylamide; (b) a copolymer of a C4-C18 alkyl (meth)acrylate monomer and between about 0.2 % and 10 % of an ethylenically-unsaturated carboxylic acid; and (c) a surfactant, which preferably comprises between about 0.01 % and 10 % by dry weight of said copolymers of a phosphate ester surfactant. Said copolymers (a) and (b) are selected from: (i) a blend of copolymers (a) and (b), at least one of which is an emulsion copolymer; (ii) an interpolymer of copolymers (a) and (b) where said alkyl (meth)acrylate monomer of copolymers (a) and (b) are the same; and (iii) an interpenetrating polymer network of copolymers (a) and (b). Advantageously, the ratio of acrylamide to unsaturated acid in the copolymer ranges from about 1:10 to 10:1 by weight. Advantageously, the emulsion copolymer(s) includes up to 25 % by weight of styrene or other aromatic monomer(s).