Polycarboxylic acid copolymer, cement dispersant, cement admixture, and cement composition

摘要

An object of the present invention is to provide a polycarboxylic acid copolymer which is remarkably excellent in various performances, particularly dispersibility, and useful for various uses such as a dispersant and a cement admixture. Another object of the present invention is to provide a cement dispersant, a cement admixture, and a cement composition using such a polycarboxylic acid copolymer. A polycarboxylic acid copolymer comprising a structural unit (I) derived from an unsaturated polyalkylene glycol monomer (a) and a structural unit (II) derived from an unsaturated carboxylic acid monomer (b). The copolymer has a weight average molecular weight (Mw) of 5000 to 25000, and the copolymer is a dimer formed by bonding two unsaturated polyalkylene glycol monomers (a). And a polycarboxylic acid copolymer having an area ratio of 7% or more.