CROSSLINKED POLYASPARTATE SALTS AND A PROCESS FOR THEIR PRODUCTION

摘要

Crosslinked polyaspartate salts (PAS) and a process for forming such salts which in a first embodiment reacts PSI with polyhydrazide selected from the group consisting of dihydrazides and trihydrazides, mixtures thereof such as malonic acid dihydrazide, adipic acid dihydrazide, terephthalic dihydrazide, subsequently hydrolyzing said crosslinked PSI with base to produce crosslinked polyaspartate. In a second embodiment, PSI is reacted with hydrazine to form an intermediate product which is reacted with polyacyl chloride such as diacyl chloride or triacyl chloride or polyester such as a diester or triester to produce a desired crosslinked PSI followed by hydrolysis to the crosslinked salt. Isolation of the intermediate before reaction with the polyacyl chloride or polyester is unnecessary.