Compositions and methods relating to an adhesive composition

• US 20060014861A1
• Filed: 06/09/2005
• Published: 01/19/2006
• Est. Priority Date: 06/11/2004
• Status: Abandoned Application

• Current Assignee: Montana State University
• Original Assignee: Montana State University
• Inventors: Haag, Anthony P., Geesey, Gill G.
• Application Number:
  US11/149,981
• Publication Number:
  US 20060014861A1
• Time in Patent Office: Days
• US Class Current: 524/56
• CPC Class Codes: C09D 105/02 Dextran; Derivatives thereof
• CPC Class Codes: C12P 19/08 Dextran

Abstract

The present invention is an adhesive composition including a biopolymer and methods of making and using the composition. The biopolymer in the composition can, in some instances, be a polysaccharide. The composition can also include a surfactant. In some embodiments, the polysaccharide is treated to reduce its hydrophilicity to improve moisture resistance of the adhesive bond.

Claims

1. An adhesive composition comprising:

(a) from about 10% by weight to about 50% by weight of dextran; and

(b) from about 90% by weight to about 50% by weight of a solvent.

2. The composition of claim 1, wherein the dextran has an average molecular weight of from about 40 kDa to about 40,000 kDa.

3. The composition of claim 1, wherein the dextran comprises a dextran mixture comprising:

(a) a dextran having an average molecular weight of about 500 kDa; and

(b) a native dextran having a molecular weight ranging from about 2,000 to about 5,000 kDa.

4. The composition of claim 3, wherein the dextran mixture comprises a ratio ranging from about 100:

1 to about 1;

1 of the dextran having an average molecular weight of about 500 kDa to the native dextran.

5. The composition of claim 1, wherein the dextran is a derivatized dextran.

6. The composition of claim 5, wherein the derivatized dextran is an acetylated dextran.

7. The composition of claim 1, wherein the solvent comprises water.

8. The composition of claim 1, further comprising a surfactant.

9. The composition of claim 8, wherein the surfactant is present in the composition in an amount of from about 0.1% by weight to about 5% by weight with respect to the dextran.

10. The composition of claim 8, wherein the surfactant is chosen from the group consisting of a glycolipid, a monorhamnolipid, a dirhamnolipid, and Tween.

11. The composition of claim 1, wherein the composition has an average bond strength of at least 500 psi.

12. The composition of claim 1, wherein the dextran is from Leuconostoc mesenteroides.

13. The composition of claim 1, further comprising another polysaccharide.

14. A method of making the composition of claim 1, the method comprising:

growing Leuconostoc mesenteroides in a fluid comprising sucrose;

removing cells of Leuconostoc mesenteroides from the fluid; and

treating the fluid with isopropyl alcohol.

15. A method of using an adhesive composition comprising:

applying the composition of claim 1 to a first substrate; and

contacting the first substrate with a second substrate.

16. The method of claim 15 further comprising applying the adhesive composition to the second substrate before contacting the first substrate with the second substrate.

17. The method of claim 15, wherein the dextran comprises a dextran mixture comprising:

(a) a dextran having an average molecular weight of about 500 kDa; and

(b) a native dextran having a molecular weight ranging from about 2,000 kDa to about 5,000 kDa.

18. The method of claim 15, wherein the dextran is a derivatized dextran, wherein the derivatized dextran has reduced hydrophilicity.

19. A method according to claim 15-18 wherein at least one of the first substrate and the second substrate is chosen from the group consisting of a hard wood, a soft wood, and wood particle board.

20. The method of claim 15, further comprising subsequently applying moisture to the composition.

21. The method of claim 20, wherein the applying moisture causes a bond between the first substrate and second substrate to weaken.