Patent ID: 7501475

Claim:
A water-based polymer dispersion for isocyanate-crosslinked adhesives comprising: a polymer (1) which is obtained by emulsion polymerization of a monomer composition comprising 80 to 99.99% by mass of at least one monomer selected from the group consisting of an aromatic vinyl monomer and a (meth)acrylate monomer, 0.01 to 1% by mass of a crosslinkable monomer, and 0 to 19.99% by mass of a different monomer and has a glass transition temperature Tg of 10 to 40° C.; and a polymer (2) which is obtained by emulsion polymerization of a monomer composition comprising 80 to 99.4% by mass of at least one monomer selected from the group consisting of an aromatic vinyl monomer and a (meth)acrylate monomer, 0.5 to 5% by mass of a hydroxyl group-containing vinyl monomer, 0.1 to 5% by mass of an ethylenically unsaturated carboxylic acid monomer, and 0 to 19.0% by mass of a different monomer and has a Tg of −30 to 10° C., wherein the mass ratio of the polymer (1)/polymer (2) is 20/80 to 80/20, and the polymers (1) and (2) have a Tg difference of 20 to 60° C. and form particles having an average particle size of 200 to 600 nm.