Biodegradable, water absorbable resin and its preparation method

• US 20040019172A1
• Filed: 12/12/2002
• Published: 01/29/2004
• Est. Priority Date: 07/26/2002
• Status: Abandoned Application

• Current Assignee: Tou-Hsiung Yang
• Original Assignee: Tou-Hsiung Yang
• Inventors: Hara, Toshio, Su, Yuan-Chi, Yang, Kun-Hsiang, Yang, Shih-Ching
• Application Number:
  US10/317,573
• Publication Number:
  US 20040019172A1
• Time in Patent Office: Days
• US Class Current: 527/200
• CPC Class Codes: C08B 37/006 Heteroglycans, i.e. polysaccharides having more than one sugar residue in the main chain in either alternating or less regular sequence; Gellans; Succinoglycans; Arabinogalactans; Tragacanth or gum tragacanth or traganth from Astragalus; Gum Karaya from Sterculia urens; Gum Ghatti from Anogeissus latifolia; Derivatives thereof
• CPC Class Codes: C08B 37/0072 Hyaluronic acid, i.e. HA or hyaluronan; Derivatives thereof, e.g. crosslinked hyaluronic acid (hylan) or hyaluronates

Abstract

The present invention relates to a method for the production of a biodegradable, water absorbable resin, by directly cross-linking of a culture broth with a cross-linker. The cross-linker contains two or more functional groups in the same molecule which can react with the functional groups in the culture broth. The present invention further relates to a biodegradable, water absorbable resin and its uses.

Claims

1. A method for the production of a biodegradable, water absorbable resin comprising directly cross-linking a culture broth with a cross-linker, wherein the cross-linker contains two or more functional groups which can react with the functional groups in the culture broth.

2. The method of claim 1, wherein the culture broth is a microbial culture broth selected from the group consisting of a poly-amino acid, a polysaccharide, and a mixture thereof.

3. The method of claim 2, wherein the poly-amino acid is selected from the group consisting of poly-γ

-glutamic acid, polyaspartic acid, polylysine, and mixtures thereof.

4. The method of claim 3, wherein the poly-amino acid is poly-γ

-glutamic acid.

5. The method of claim 2, wherein the polysaccharide is selected from the group consisting of glucose, fructose, rhamnose, and fucose, and mixtures thereof, and a mixture of one or more foregoing polysaccharides with a polycarboxylic acid selected from the group consisting of glucuronic acid, hyaluronic acid, and a mixture thereof.

6. The method of claim 1, wherein the functional group in the culture broth comprises carboxyl, hydroxyl, aldehyde, carbonyl, sulfone, nitro, or amino group, or combinations thereof.

7. The method of claim 1, wherein the cross-linker is a polyepoxy compound containing two epoxy groups in the same molecule.

8. The method of claim 7, wherein the polyepoxy compound is diglycidyl ether.

9. The method of claim 8, wherein the diglycidyl ether is a compound of Formula (I):

10. The method of claim 8, wherein the diglycidyl ether is propylene glycol diglycidyl ether or glycerin-1,3-diglycidyl ether.

11. The method of claim 1, wherein the amount of the cross-linker is 0.1 to 10 wt %, based on the weight of the culture broth.

12. The method of claim 1, wherein the cross-linking is conducted at a temperature from 0°

C. to 100°

C.

13. The method of claim 1, wherein the cross-linking is conducted at a pH from 3.5 to 8.

14. A biodegradable, water absorbable resin comprising the components of culture broth necessary for the growth of microbes and/or metabolites produced by microbes.

15. The biodegradable, water absorbable resin of claim 14, for use in agricultural and horticultural, civil construction, medical and health-care, or biotechnology materials.

16. The biodegradable, water absorbable resin of claim 15, for use as a compost adding agent, seed coating agent, desert greenification material.

17. A biodegradable, water absorbable resin prepared by directly cross-linking a culture broth with a cross-linker, wherein the cross-linker contains two or more functional groups which can react with the functional groups in the culture broth.

18. The biodegradable, water absorbable resin of claim 17, wherein the culture broth is a microbial culture broth selected from the group consisting of a poly-amino acid, a polysaccharide, and a mixture thereof.

19. The biodegradable, water absorbable resin of claim 18, wherein the poly-amino acid is selected from the group consisting of poly-γ

-glutamic acid, polyaspartic acid, polylysine, and mixtures thereof.

20. The biodegradable, water absorbable resin of claim 19, wherein the poly-amino acid is poly-γ

-glutamic acid.

21. The biodegradable, water absorbable resin of claim 18, wherein the polysaccharide is selected from the group consisting of glucose, fructose, rhamnose, and fucose, and mixtures thereof, and a mixture of one or more foregoing polysaccharides with a polycarboxylic acid selected from the group consisting of glucuronic acid, hyaluronic acid, and a mixture thereof.

22. The biodegradable, water absorbable resin of claim 17, wherein the functional group in the culture broth comprises carboxyl, hydroxyl, aldehyde, carbonyl, sulfone, nitro, or amino group, or combinations thereof.

23. The biodegradable, water absorbable resin of claim 17, wherein the cross-linker is a polyepoxy compound containing two epoxy groups in the same molecule.

24. The biodegradable, water absorbable resin of claim 23, wherein the polyepoxy compound is diglycidyl ether.

25. The biodegradable, water absorbable resin of claim 24, wherein the diglycidyl ether is a compound of Formula (I):

26. The biodegradable, water absorbable resin of claim 24, wherein the diglycidyl ether is propylene glycol diglycidyl ether or glycerin-1,3-diglycidyl ether.

27. The biodegradable, water absorbable resin of claim 17, wherein the amount of the cross-linker is 0.1 to 10 wt %, based on the weight of the culture broth.

28. The biodegradable, water absorbable resin of claim 17, wherein the cross-linking is conducted at a temperature from 0°

C. to 100°

C.

29. The biodegradable, water absorbable resin of claim 17, wherein the cross-linking is conducted at a pH from 3.5 to 8.

30. The biodegradable, water absorbable resin of claim 17, for use in agricultural and horticultural, civil construction, medical and health-care, or biotechnology application.

31. The biodegradable, water absorbable resin of claim 30, for use as a compost aid, seed coating agent, or desert greenification material.