Claims
- 1. A method for preparing a polysuccinimide derivative, which comprises, subjecting the polysuccinimide to a ring-opening reaction.
- 2. The method of claim 1, wherein said polysuccinimide is formed by polymerization of L-aspartic acid in a supercritical fluid.
- 3. The method of claim 1, wherein said ring-opening reaction is carried out in a supercritical fluid.
- 4. The method of claim 1, wherein said ring-opening reaction is carried out subsequently to the formation of polysuccinimide in a supercritical fluid.
- 5. The method of claim 1, wherein said ring-opening reaction is carried out in water.
- 6. The method of claim 1, wherein said ring-opening reaction is carried out in the presence of an amine.
- 7. The method of claim 6, further comprising water as a cosolvent.
- 8. The method of claim 7, wherein said amine is a combination of amines.
- 9. The method of claim 8, wherein said combination of amines is comprised of ammonium hydroxide and 2-aminoethanol to form a resin.
- 10. The method of claim 9, wherein said resin contains a free carboxylic acid salt and the amides of ammonia and aminoethanol.
- 11. The method of claim 6, wherein said amine has the general formula: R1R2R3N; where R1, R2, and R3 are the same or different radicals selected from the group consisting of hydrogen, an alkyl, a substituted alkyl, an alkenyl, an aryl, an aryl-alkyl, and a substituted aryl radical:.
- 12. The method of claim 11, wherein said alkyl is selected from the group consisting of methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, sec-butyl, t-butyl, n-amyl, isoamyl, t-amyl, n-hexyl, n-octyl, capril, n-decyl, lauryl, myristyl, cetyl, and stearyl.
- 13. The method of claim 11, wherein said substituted alkyl is hydroxyethyl.
- 14. The method of claim 11, wherein said alkenyl is allyl.
- 15. The method of claim 11, wherein said aryl is phenyl.
- 16. The method of claim 11, wherein said aryl-alkyl is benzyl.
- 17. The method of claim 11, wherein said substituted aryl radical is selected from the group consisting of alkylphenyl, chlorophenyl and nitrophenyl.
- 18. The method of claim 6, wherein said amine is triethanol amine.
- 19. The method of claim 6, wherein said amine is selected from the group consisting of aminopyrdine, imidazole and a polyamine.
- 20. The method of claim 19, wherein said polyamine is selected from the group consisting of a gelatin, chitin, lysine, omithine and melamine.
- 21. The method of claim 6, wherein said amine is aminoethoxylate.
- 22. A derivative formed by the method of claim 1.
- 23. The method of claim 2, wherein said polymerization is carried out in the presence of a stabilizer.
- 24. The method of claim 23, wherein said stabilizer is selected from the group consisting of a thermal stabilizer, an antioxidant and a mixture thereof.
Parent Case Info
[0001] This application is a Continuation-In-Part of application Ser. No. 10/307,349 and Ser. No. 10/307,387, both filed Dec. 2, 2002, which are a Continuation and Continuation-In-Part, respectively, of application Ser. No. 09/776,897, filed Feb. 6, 2001, now U.S. Pat. No. 6,495,658, issued Dec. 17, 2002, all three of which are incorporated herein by reference in their entirety.
Continuation in Parts (2)
|
Number |
Date |
Country |
Parent |
10307349 |
Dec 2002 |
US |
Child |
10698411 |
Nov 2003 |
US |
Parent |
09776897 |
Feb 2001 |
US |
Child |
10698411 |
Nov 2003 |
US |