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US 5,296,578 AGranted
Production of polysuccinimide and polyaspartic acid from maleic anhydride and ammonia
AssigneeDonlar Corporation
InventorsLarry P. Koskan, Abdul R. Y. Meah
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Abstract
Production of polysuccinimide by reacting maleic anhydride and ammonia at elevated temperatures. The base hydrolyzed polyaspartic acid product.
Claims11
A method of producing a polysuccinimide comprising the steps of:
- a). adding maleic anhydride and ammonia to the same reaction vessel, and
- b). heating the resulting mixture to a temperature of at least 170.degree. C., until at least a yield of polysuccinimide of at least 70% of theoretical has been produced.
Dependencies are inferred from the claim text.