Claims
- 1. A process for the preparation of copolymers of polysuccinimide comprising reacting maleic acid, a polycarboxylic acid and ammonia at a temperature of 120.degree.-350.degree. C.
- 2. The process of claim 1 wherein the temperature is 200.degree.-300.degree. C.
- 3. The process of claim 1 wherein the polycarboxylic acid is selected from the group consisting of adipic acid, citric acid, fumaric acid, malic acid, malonic acid, succinic acid, glutaric acid, oxalic acid, pimelic acid, itaconic acid, nonanedioic acid, dodecanedioic acid, octanedioic acid, isophthalic, terphthalic and phthalic acid.
Parent Case Info
This application is a divisional application of U.S. patent application Ser. No. 07/994,922, filed Dec. 22, 1992, now U.S. Pat. No. 5,408,028.
US Referenced Citations (15)
Divisions (1)
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Number |
Date |
Country |
Parent |
994922 |
Dec 1994 |
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