Patent · US Expired

Preparation of polymers of aspartic acid and their use

US5548036A · kind A · utility

16Cited by

3References

8Claims

0Family size

Assignee

BASF SE

Inventors

Matthias Kroner · Eisenberg, DE
Heinrich Hartmann · Schifferstadt, DE
Gunnar Schornick · Neuleiningen, DE
Richard Baur · Mutterstadt, DE
Birgit Potthoff-Karl · Weinheim, DE
Volker Schwendemann · Neustadt, DE
Alexander Kud · Eppelsheim, DE

Key dates

Filing date	Jun 26, 1995
Grant date	Aug 20, 1996
Priority date	—
Expiry date	Jun 26, 2015

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K23/16
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

Process for the preparation of polymers of aspartic acid by reacting (a) maleic anhydride and (b) ammonia and/or primary or secondary amines without diluent in the (a):(b) molar ratio of 1:0.1 to 1:3 to give monoamides of maleic acid, fumaric acid or their ammonium salts at up to 100.degree. C. and subsequent condensation of the reaction products, with or without compounds capable of cocondensation, at above 100.degree. C. and, where appropriate, hydrolysis of the condensates and use of the polymers as scale inhibitor, as dispersants for pigments and as additive to detergents and cleaners.

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