Patent ID: 9102777
Filing Date: 2015-08-11
Classification: C08F,C09D,Y10T

Abstract:
1. An emulsion binder comprising an A-B block copolymer formed of a polymer block A and another polymer block B, at least 90 mass % of constituent monomer units of said A-B block copolymer having been derived from at least one (meth)acrylate-based monomer, wherein: the A-B block copolymer has a number average molecular weight of equal to or less than 100,000 and a polydispersity index (weight average molecular weight/number average molecular weight) of not greater than 1.7, the polymer block A has a number average molecular weight of equal to or greater than 22,000, an acid value of 0 to 30 mgKOH/g and a glass transition point of not higher than 60° C, the polymer block B has an acid value of 75 to 250 mgKOH/g, and the A-B block copolymer has been neutralized with an alkaline material, and has been allowed to self-emulsify in an aqueous medium to form emulsion particles having a number average particle size of 30 to 300 nm.