Preparation of anhydropolyamino acids
US5470942A · kind A · utility
5Cited by
13References
13Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 16, 1995 |
| Grant date | Nov 28, 1995 |
| Priority date | — |
| Expiry date | Feb 16, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G73/1092
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
There is disclosed a process for preparing polyaspartic acid by thermal condensation of L-aspartic acid in a novel catalyst which shortens the reaction time and increases the molecular weight of the polymer. The novel catalyst is a catalytically effective methylenephosphonic acid. Typical catalysts are 1-hydroxyethylidene-1,1-diphosphonic acid and aminotris(methylenephosphonic acid). The methylenephosphonic acid is blended with the amino acid in a molar ratio of amino acid to catalyst in the range of from about 1:1 to 40:1.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.