# US 5,710,327 A · Preparation of modified polyaspartic acids

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- Number: US 5,710,327 A
- Document ID: US5710327A
- Status: Granted
- Kind: A
- Application number: 08/809,296
- Filed: 1997-03-27
- Granted: 1998-01-20
- Earliest claimed: 1994-09-27
- Assignees: BASF SE
- Inventors: Matthias Kroner; Gunnar Schornick
- Web page: https://patentgrep.com/patent/US5710327A

## CPC

- C08G 73/1092: {Polysuccinimides}
- C11D 3/3719: {Polyamides or polyimides}
- C08G: MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C11D: DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL

## Abstract

Modified polyaspartic acids are prepared by condensing aspartic acid with polybasic carboxylic acids or anhydrides of polybasic carboxylic acids and ammonia without a diluent at temperatures of at least 140.degree. C. in the absence of inorganic acids.

## Claims

### Claim 1

A process for preparing modified polyaspartic acids, which comprises cocondensing aspartic acid with
(a) polybasic carboxylic acids or anhydrides of polybasic carboxylic acids and
(b) ammonia without diluent at temperatures of at least 140.degree. C. in the absence of inorganic acids, and hydrolyzing the cocondensates with alkali metal and/or alkaline earth metal bases in aqueous medium.

### Claim 2 (depends on 1)

A process as claimed in claim 1, wherein
a) 0.01-2 tool of at least one polybasic carboxylic acid and
b) 0.01-2 mol of ammonia are employed per mole of aspartic acid.

### Claim 3 (depends on 1)

A process as claimed in claim 1, wherein citric acid is employed as component (a), and the aspartic acid: citric acid: ammonia molar ratio is 1:1:1.