Preparation of anhydropolyamino acids

Details Preparation of anhydropolyamino acids Preparation of anhydropolyamino acids

1995-02-16

1995-11-28

Dodsoo, Shelley

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

From carboxylic acid or derivative thereof

210696, 210697, 210698, 210699, 210700, 525421, 525422, 525435, 528332, 528345, 528363, C08G 6910

Patent

active

054709423

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.

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