Patent ID: 7928161

Claim:
A dispersion of polymer particles in a continuous aqueous phase, wherein the dispersed particles include a polyurethane resin that is the reaction product of a polyisocyanate, at least one curing agent, and at least one high equivalent weight material having isocyanate-reactive groups, in which the high equivalent weight material includes at least one hydroxymethyl-containing polyester polyol derived from a fatty acid, wherein the hydroxymethyl-containing polyester polyol has the following average structure: [H—X] (z−p) —R—[X—Z] p (I) wherein R is the residue of an initiator compound having z hydroxyl and/or primary or secondary amine groups, where z is at least two; each X is independently —O—, —NH— or —NR′— in which R′ is an inertly substituted alkyl, aryl, cycloalkyl, or aralkyl group, p is a number from 1 to z representing the average number of [X—Z] groups per hydroxymethyl-containing polyester polyol molecule, Z is a linear or branched chain containing one or more A groups, provided that the average number of A groups per molecule is ≧1.3 times z, and each A is independently selected from the group consisting of A1, A2, A3, A4 and A5, provided that at least some A groups are A1, A2 or A3, wherein A1 is: wherein B is H or a covalent bond to a carbonyl carbon atom of another A group; m is number greater than 3, n is greater than or equal to zero and m+n is from 11 to 19, and wherein A1 is from 30 to 80 mole-% of A; A2 is: wherein B is as before, v is a number greater than 3, r and s are each numbers greater than or equal to zero with v+r+s being from 10 to 18, and wherein A2 is from 10 to 60 mole-% of A; A3 is: wherein B, v, each r and s are as defined before, t is a number greater than or equal to zero, and the sum of v, r, s and t is from 10 to 18, and wherein A3 is from 0.1 to 10 mole-% of A; A4 is where w is from 10-24: and A5 is where R′ is a linear or branched alkyl group that is substituted with at least one cyclic ether group and optionally one or more hydroxyl groups or other ether groups.