Patent ID: 6756460
Filing Date: 2004-06-29
Classification: C08F,C11D

Abstract:
A water-soluble copolymer, which is obtained by copolymerizing comonomers comprising: an unsaturated monocarboxylic acid monomer (1) as represented by a general formula (1) below; an unsaturated dicarboxylic acid monomer (2a) as represented by a general formula (2a) below and/or an unsaturated dicarboxylic acid monomer (2b) as represented by a general formula (2b) below; and an unsaturated alcoholic monomer (3) as represented by a general formula (3) below,with the copolymer having a residual amount of the unsaturated dicarboxylic acid monomer of not more than 8 weight %, and a residual amount of the unsaturated alcoholic monomer of not more than 45 weight %, wherein the general formula (1) is: where: A1, A2, and A3 each independently represent a hydrogen atom or a methyl group; and X1 represents a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group, or an organic amine group; wherein the general formula (2a) is: where: A4 and A5 each independently represent a hydrogen atom, a methyl group, or â€”COOX3; A6 represents a hydrogen atom, a methyl group, or â€”CH2COOX4; only any one of A4, A5, and A6 is â€”COOX3 or â€”CH2COOX4; and X2, X3, and X4 each independently or together represent a hydrogen atom, a monovalent metal, a divalent metal, an ammonium group, or an organic amine group; wherein the general formula (2b) is: where: A7 and A8 each independently represent a hydrogen atom or a methyl group; and wherein the general formula (3) is: where: R1, R2 and R4 each independently represent a hydrogen atom or a methyl group, and R1 (or R4) and R2 are not simultaneously methyl groups; and R3 represents â€”CH2â€”, â€”(CH2)2â€”, or â€”C(CH3)2â€”, and the total carbon atoms contained in R1, R2, R3 and R4 is 3; Y represents an alkylene group having 2 to 18 carbon atoms; and n is an integer of 1 to 300.