Patent ID: 6437027
Filing Date: 2002-08-20
Classification: C04B

Abstract:
A process for producing a powdery dispersant for cement-containing compositions, comprising adding 0.01-2.5 wt. % of a reducing agent to a polycarboxylate polymer containing at least two different structural units represented by formulas (1) and (2): wherein each of R1, R2, and R3, which may be identical or different from one another, represents a hydrogen atom or a methyl group; R4 represents a C1-C3 alkyl group; M1 represents a hydrogen atom, an alkali metal, an alkaline earth metal, ammonium, or an organic amine; Y represents â€”CH2Oâ€” or â€”COOâ€”; and n is 2-200; drying, and pulverizing the resultant mixture.