Production of polysuccinimide

Details Production of polysuccinimide Production of polysuccinimide

1994-01-28

1996-02-13

McKane, Joseph K.

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

Synthetic resins

Treating polymer containing material or treating a solid...

528322, 528328, 528345, 528363, 528367, 528392, 526204, 526210, 526212, 526213, 526225, 526304, 525418, 525419, 525420, 525539, 548520, C08G 6910, C07D207404

Patent

active

054912130

ABSTRACT:
Polysuccinimide is prepared by reacting an unsaturated C.sub.2 dicarboxylic acid or anhydride thereof, e.g., maleic acid, fumaric acid, and maleic anhydride, with a particulate ammonium salt that is thermally decomposable to liberate ammonia. The reaction is carried out at a temperature which is above the thermal decomposition temperature of the ammonium salt and for a time period which is sufficient for the acid or anhydride to react with the ammonia liberated from the ammonium salt and for polymerization to occur. The present method avoids the prior art problems of controlling ammonia losses and water removal. The product polysuccinimide can be readily hydrolyzed to polyaspartic acid or a salt thereof, if desired.

REFERENCES:
patent: 4839461 (1989-06-01), Boehmke
patent: 5219952 (1993-06-01), Koskan et al.
patent: 5292858 (1994-03-01), Wood
patent: 5367047 (1994-11-01), Wood
patent: 5371177 (1994-12-01), Paik et al.
patent: 5371179 (1994-12-01), Paik et al.
patent: 5371180 (1994-12-01), Groth et al.
patent: 5373088 (1994-12-01), Koskan et al.

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