Patent ID: 7368488
Filing Date: 2008-05-06
Classification: C04B

Abstract:
1. A cement admixture comprising a polycarboxylic acid polymer, wherein said polycarboxylic acid polymer has a site represented by the following formula (1): wherein R 1 and R 2 may be the same or different and each represents a hydrogen atom or a methyl group; R 3 may be the same or different and represents an alkylene group containing 3 to 18 carbon atoms; x represents a number of 0 to 2; y represents 0 or 1; n and k represent an average molar number of addition of an oxyethylene group, in which n is a number of 1 to 200 and k is a number of 1 to 200; m represents an average molar number of addition of the oxyalkylene group and is a number of 1 to 50; n+m+k is a number of 3 to 200; and R 4 represents a hydrogen atom or a hydrocarbon group containing 1 to 20 carbon atoms.