Patent ID: 6911494
Filing Date: 2005-06-28
Classification: C04B,C08G,C08L

Abstract:
1. A cement admixture comprising, as three essential constituents, 1) a copolymer (A), 2) an unsaturated (poly)alkylene glycol ether monomer (a), and 3) an unpolymerizable (poly)alkylene glycol (B) not containing an alkenyl group, wherein the content of the unsaturated (poly)alkylene glycol ether monomer (a) is 1 to 100% by mass relative to the copolymer (A) and the content of the unpolymerizable (poly)alkylene glycol (B) not containing an alkenyl group is 1 to 50% by mass relative to the copolymer (A), and wherein the copolymer (A) comprises, as essential constituent units, a constituent unit (I) derived from the unsaturated (poly)alkylene glycol ether monomer (a), and a constituent unit (II) derived from an unsaturated carboxylic acid monomer (b), with the constituent unit (I) and constituent unit (II) each accounting for not less than 1% by mass based on all of the constituent units, the unsaturated (poly)alkylene glycol ether monomer (a) is represented by the general formula (1): wherein Y represents an alkenyl group containing 5 to 8 carbon atoms, the n R the unsaturated carboxylic acid monomer (b) being an unsaturated monocarboxylic acid monomer.