Copolymer acting as thickening agent for aqueous preparations having a pH above 5.5, a method for its preparation and its use as a thickening agent

US5086142A · kind A · utility

Assignee

• Th. Goldschmidt. AG · DE

Inventors

• Jurgen Fock · Goldkronach, DE
• Eberhard Esselborn · Essen, DE

Key dates

• Filing date: Jan 31, 1991
• Grant date: Feb 4, 1992
• Expiry date: Jan 31, 2011

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08G65/2609
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A copolymer is disclosed which acts as a thickening agent for aqueous preparations having a pH of more than 5.5. The copolymer is obtainable by emulsion polymerization in an aqueous medium, at a pH of 2.5 to 5, in the presence of an initiator forming free radicals, at a temperature of 60.degree. to 95.degree. C. of PA1 10 to 50% by weight of acrylic or methacrylic acid, PA1 25 to 75% by weight of a nonionic vinyl monomer and PA1 2 to 50% by weight of a macromonomer of the formula EQU CH.sub.2 .dbd.CR--CH.sub.2 --O--(C.sub.n H.sub.2n O).sub.a (C.sub.m H.sub.2m O).sub.b (C.sub.p H.sub.2p O).sub.c H wherein PA1 R is H or CH.sub.3 PA1 n, p are the same or different and in each case are 2 or 3, with the proviso that n and p have a value of not more than 2.3 in the average molecule, PA1 m=a whole number from 12 to 18 PA1 a=10 to 100, PA1 b=2 to 10, PA1 c=0 to 10 and wherein the sum of the monomers amounts to 100% by weight.