Water-soluble polymers of esters made from acrylic acid and alkylpolyalkylene glycols

US6849703B2 · kind B2 · utility

Assignee

• BASF SE

Inventors

• Matthias Kroner · Eisenberg, DE
• Karl-Heinz Buchner · Altlußheim, DE
• Gregor Brodt · Heppenheim, DE

Key dates

• Filing date: May 2, 2002
• Grant date: Feb 1, 2005
• Expiry date: May 2, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C04B2103/52
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Water-soluble polymers of esters made from acrylic acid and alkylpolyalkylene glycols, obtainable by azeotropic esterification of a mixture of acrylic acid and alkylpolyalkylene glycol in a molar ratio of from 2 to 3:1 in the presence of at least 85% by weight, based on the alkylpolyalkylene glycol, of an organic solvent which forms an azeotrope with water, followed by free-radical polymerization, in an aqueous medium, of the mixture obtained during the esterification, where the organic solvent is distilled off azeotropically from the reaction mixture during the polymerization, and the water removed by distillation is returned to the mixture or replaced by a feed of fresh water, and preparation and use of these polymers as an additive to cementitious systems.