US 6,437,027 B1 · Process for producing dispersant for powdery hydraulic composition

Abstract

The present invention relates to a process for producing a powdery dispersant for preparing hydraulic compositions, which process includes adding an reducing agent to a solution predominantly containing a polycarboxylate polymer compound having a polyalkylene glycol chain, drying the resultant mixture, and pulverizing the dried product; the resultant powdery dispersant for preparing hydraulic compositions; and a hydraulic composition containing the dispersant. According to the present invention, there can be provided a powdery dispersant for preparing a hydraulic composition, which has excellent fluidity and dispersibility. The dispersant can be added to cement in advance.

Claims27

Dependent claims

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 —CH2O— or —COO—;
and n is 2-200;
drying, and
pulverizing the resultant mixture.

4 more elements

Dependencies are inferred from the claim text.

Process for producing dispersant for powdery hydraulic composition

Life of this patent

Process for producing dispersant for powdery hydraulic composition

Life of this patent

Abstract

Claims27