Patent ID: 7691921
Filing Date: 2010-04-06
Classification: C04B,C08F

Abstract:
1. A method for producing a copolymer for a cement admixture, which comprises a step of polymerizing monomer components comprising at least one unsaturated polyalkylene glycol ether-based monomer (A) represented by the following formula (1): wherein R at least one unsaturated organic acid-based monomer (B) represented by the following formula (2): wherein R wherein the unsaturated polyalkylene glycol ether-based monomer (A) is added into a reactor in advance and the unsaturated organic acid-based monomer (B) is added thereto continuously or stepwise with a decreasing or increasing addition rate, and when the addition rate of the unsaturated organic acid-based monomer (B) is changed continuously, the ratio of the maximum addition rate (V