To provide a water-soluble polymer useful as an additive to a cementitious composition and its manufacturing method.
The water-soluble polymer of an ester comprises acrylic acid, methacrylic acid and an alkylpolyalkylene glycol and is obtained by subjecting a mixture of acrylic acid (A), methacrylic acid (B) and the alkylpolyalkylene glycol (C) having a moleclar weight (Mw) of 350-4,000 to an azeotropic esterification in the presence of at least 85 mass%, based on the alkylpolyalkylene glycol (C), of an organic solvent forming an azeotropic mixture with water, subsequently free-radically polymeizing in an aqueous medium a mixture obtained during the esterification while removing the organic solvent during the polymerization by azeotropic distillation from the reaction mixture, and returning water removed by distillation to the mixture or feeding fresh water for replacement.
BUCHNER KARL-HEINZ
BRODT GREGOR
Next Patent: BRANCHED POLYOXYMETHYLENE COPOLYMER AND RESIN COMPOSITION THEREOF