PROCESS FOR PRODUCING (METH)ACRYLIC ACID POLYMER

摘要

A process for producing a (meth)acrylic acid polymer suitable for use as a cement dispersant of stable quality. The process comprises: a step (1) in which (meth)acrylic acid and a polyalkylene glycol monoalkyl ether are subjected to esterification in a molar ratio of 5/1 to 50/1 in the presence of an acid catalyst and a polymerization inhibitor, the acid catalyst is subsequently deactivated with an alkali, and unreacted (meth)acrylic acid is then distilled off to obtain an esterification product containing a (meth)acrylic ester and the residual unreacted (meth)acrylic acid; and a step (2) in which the (meth)acrylic ester and the residual unreacted (meth)acrylic acid in the esterification product are copolymerized in the pH range of 1.5 to 3.5.