Thermosetting adhesives comprising a resin having azetidinium functional groups

• US 7,781,501 B2
• Filed: 08/28/2006
• Issued: 08/24/2010
• Est. Priority Date: 09/02/2005
• Status: Expired due to Fees

• Current Assignee: Georgia-Pacific Chemicals LLC (KOCH Industries Incorporated)
• Original Assignee: Georgia-Pacific Chemicals LLC (KOCH Industries Incorporated)
• Inventors: Rivers, Jason, Dopico, Pablo, Rammon, Richard, Hagiopol, Cornel
• Primary Examiner(s): Eashoo; Mark
• Assistant Examiner(s): Heincer; Liam J
• Application Number:
  US11/467,669
• Publication Number:
  US 20070054144A1
• Time in Patent Office: 1,457 Days
• Field of Search: 524/13, 524/27, 524/14
• US Class Current: 524/14
• CPC Class Codes: C08L 2666/16 Addition or condensation polymers of aldehydes or ketones according to C08L59/00 - C08L61/00; Derivatives thereof
• CPC Class Codes: C08L 61/06 of aldehydes with phenols
• CPC Class Codes: C08L 97/02 Lignocellulosic material, e.g. wood, straw or bagasse manufacture of articles made from lignocellulosic material by dry processes B27N
• CPC Class Codes: C09J 179/02 Polyamines
• CPC Class Codes: Y10T 428/31989 Of wood

Abstract

Thermosetting adhesives for use in e.g., particleboard or fiberboard, wherein the adhesives comprise a resin having azetidinium functional groups, can provide fast tack-building and curing, as well as ultimately excellent bonding characteristics. Preferably, the azetidinium-functional resin is formed from the reaction product of a polyamidoamine and epichlorohydrin.

Claims

1. A composition for preparing wood composites, said composition comprising (1) a thermosetting adhesive comprising predominantly a resin having azetidinium functional groups;

(2) a wood element selected from the group consisting of wood flakes, wood strands, wood particles, wood layers, and mixtures thereof; and

(3) urea as a cross-linking additive.

2. The composition of claim 1 herein said wood element is present in an amount from about 85% to about 98% by weight, on a dry solids basis, of said composition.

3. A wood composite comprising the composition of claim 1, after said resin is cured.

4. The wood composite of claim 3, wherein said wood composite is particleboard or fiberboard.

5. The wood composite of claim 1, wherein the wood element is wood strands.

6. The wood composite of claim 1, wherein the wood element is selected from the group consisting of wood flakes, wood strands, wood particles, and wood layers.

7. A method of making a wood composite, the method comprising:

(a) forming the composition of claim 1 into substantially the shape of said wood composite, and

(b) consolidating a shaped composition obtained in step (a) using heat and pressure into said wood composite.

8. The method of claim 7, wherein the wood composite has an internal bond strength as measured by ASTM D 1037 between 100 psi and 300 psi.

9. The method of claim 8, wherein the wood composite has an internal bond strength as measured by ASTM D 1037 between 120 psi and 250 psi.

10. A composition for preparing wood composites, said composition comprising (1) a thermosetting adhesive comprising predominantly a resin having azetidinium functional groups;

(2) a wood element selected from the group consisting of wood flakes, wood strands, wood particles, wood layers, and mixtures thereof; and

(3) urea as a cross-linking additive, wherein the thermosetting adhesive is substantially free of protein.

11. The composition of claim 10, wherein said wood element is present in an amount from about 85% to about 98% by weight, on a dry solids basis, of said composition.

12. A wood composite comprising the composition of claim 10, after said resin is cured.

13. The wood composite of claim 12, wherein said wood composite is particleboard or fiberboard.

14. The wood composite of claim 12, wherein the wood element is wood strands.

15. The wood composite of claim 10, wherein the wood element is selected from the group consisting of wood flakes, wood strands, wood particles, and wood layers.

16. A method of making a wood composite, the method comprising:

(a) forming the composition of claim 10 into substantially the shape of said wood composite, and

(b) consolidating a shaped composition obtained in step (a) using heat and pressure into said wood composite.

17. The method of claim 16, wherein the wood composite has an internal bond strength as measured by ASTM D 1037 between 100 psi and 300 psi.

18. The method of claim 17, wherein the wood composite has an internal bond strength as measured by ASTM D 1037 between 120 psi and 250 psi.