Patent ID: 7012115

Claim:
An aqueous urethane polyol, which satisfies all the following requirements: 1) comprising a hydroxyl group, a urethane group and a hydrophilic group in a molecule; 2) having an average number of hydroxyl groups of 3 to 20; 3) having a hydroxyl value of 10 to 200 (mg KOH/g); 4) having an equivalent ratio of (urethane group)/(hydroxyl group+hydrophilic group) of 1 to 2; and 5) having a number average molecular weight of 1,000 to 20,000, wherein said aqueous urethane polyol is produced by reacting: (a) a polyisocyanate derived from at least an aliphatic and/or an alicyclic diisocyanate, having: an average number of isocyanate groups of 3 to 20; a concentration of isocyanate group of 3 to 25% by weight; a concentration of diisocyanate monomer of 3% by weight or less; and a number average molecular weight of 600 to 19,000; (b) a polyol; and (c) a compound comprising an active hydrogen group and a hydrophilic group in a single molecule; at an equivalent ratio of (hydroxyl group of (b)+active hydrogen group of (c))/(isocyanate group of (a))>1.