Production of polysuccinimide

Details Production of polysuccinimide Production of polysuccinimide

1994-05-17

1995-11-14

Hampton-Hightower, P.

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

Synthetic resins

From carboxylic acid or derivative thereof

528328, 528367, 525418, 525419, 525420, C08G 6900, C08G 7310

Patent

active

054667798

ABSTRACT:
Polysuccinimide is prepared by reacting ammonia gas with liquid maleic anhydride. The reaction is initially carried out at a temperature which is above the melting point of the maleic anhydride but below the boiling point of liquid maleic anhydride for a time period sufficient for the liquid maleic anhydride to react with the ammonia gas to form a reaction product thereof. The reaction product is subsequently polymerized to polysuccinimide. The present method avoids the prior art problems of water removal and minimizes the need for ammonia handling equipment. The polysuccinimide product can be readily hydrolyzed to polyaspartic acid or a salt thereof, if desired.

REFERENCES:
patent: 4839461 (1989-06-01), Boehmke
patent: 5116513 (1992-05-01), Koskan et al.
patent: 5219952 (1993-06-01), Koskan et al.
patent: 5221733 (1993-06-01), Koskan et al.
patent: 5296578 (1994-03-01), Koskan et al.

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