Claims
- 1. A copolymer of polyaspartic acid with a polycarboxylic acid wherein the polycarboxylic acid is selected from the group consisting of adipic acid, citric acid, fumaric acid, malonic acid, succinic acid, glutaric acid, oxalic acid, pimelic acid, itaconic acid, nonanedioic acid, dodecanedioic acid, octanedioic acid, isophthalic acid, terephthalic acid and phthalic acid.
- 2. The copolymer of claim 1 wherein the polycarboxylic acid is selected from the group consisting of citric acid, succinic acid, isophthalic acid, terephthalic acid and phthalic acid.
- 3. A copolymer produced by reacting maleic acid, ammonia and a polycarboxylic acid selected from the group consisting of adipic acid, citric acid, fumaric acid, malonic acid, succinic acid, glutaric acid, oxalic acid, pimelic acid, itaconic acid, nonanedioic acid, dodecanedioic acid, octanedioic acid, isophthalic acid, terephthalic acid and phthalic acid, wherein the ammonia is present in a stoichiometric amount or in stoichiometric excess.
- 4. A copolymer of polyaspartic acid with a polycarboxylic acid produced by reacting maleic acid, ammonia and a polycarboxylic acid selected from the group consisting of adipic acid, citric acid, fumaric acid, malonic acid, succinic acid, glutaric acid, oxalic acid, pimelic acid, itaconic acid, nonanedioic acid, dodecanedioic acid, octanedioic acid, isophthalic acid, terephthalic acid 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 which issued to U.S. Pat. No. 5,408,028 on Apr. 18, 1995.
US Referenced Citations (17)
Divisions (1)
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Number |
Date |
Country |
Parent |
994922 |
Dec 1992 |
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