Patent ID: 7304104
Filing Date: 2007-12-04
Classification: C04B,C08F,C08L,Y10T

Abstract:
1. An admixture for cement comprising three components of a copolymer (A), an unsaturated (poly)alkylene glycol ether monomer (a) and a non-polymerizable (poly)alkylene glycol (B) having no alkenyl group at ratios of the unsaturated (poly)alkylene glycol ether monomer (a) to the copolymer (A) in a range of 1 to 100% by mass and the non-polymerizable (poly)alkylene glycol (B) having no alkenyl group to the copolymer (A) in a range of 1 to 50% by mass, wherein the copolymer (A) contains a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a) and a constituent unit (II) derived from a maleic acid monomer (b) at ratios of the constituent unit (I) and the constituent unit (II) in a range of 1% by mass or more, respectively, in the entire constituent units, and the unsaturated (poly)alkylene glycol ether monomer (a) is represented by the general formula (1): wherein Y represents an alkenyl group containing 2 to 4 carbon atoms, R