Patent · US Expired

Preparation of copolymers of monoalkyl maleates or maleic acid and salts thereof and vinyl alkyl ethers

US5155171A · kind A · utility

1Cited by

6References

9Claims

0Family size

Assignee

BASF SE

Inventors

Harald Meyer · Monsheim, DE
Axel Sanner · Bischofswerda, DE
Hans-Juergen Raubenheimer · Ketsch, DE
Franz Frosch · Bad Dürkheim, DE

Key dates

Filing date	Jun 3, 1991
Grant date	Oct 13, 1992
Priority date	—
Expiry date	Jun 3, 2011

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC08F222/06
WIPO fieldPharmaceuticals
WIPO sectorChemistry

Abstract

Copolymers of monoalkyl maleates or maleic acid and salts thereof and vinyl alkyl ethers are prepared by free radical copolymerization of maleic anhydride and vinyl alkyl ethers and subsequent reaction with an alkanol or water and optionally metal hydroxides and/or oxides in a process wherein at every stage of the polymerization the vinyl alkyl ether component is present in excess in the reaction mixture, the free radical copolymerization is carried out in acetone and the acetone is removed by distillation during or after the esterification or hydrolysis, which comprises using a peroxyester of a carboxylic acid of 8 or more carbon atoms as polymerization initiator. The copolymers obtained are used in cosmetic preparations.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.