COMPOSITIONS AND METHODS FOR THE PRESERVATION OF WOOD

Abstract

The present invention provides compositions and methods for preserving wood. The compositions generally include at least one metal chelate or metal salt of a hydroxy analog of methionine. The method generally involves contacting wood or a wood material with a wood preservation composition of the invention. The invention also includes wood or wood products treated with a wood preservation composition of the invention.

Description

BRIEF DESCRIPTION OF THE DRAWING

FIG. 1 depicts a bar graph illustrating the efficacy of the test wood preservatives to prevent wood decay by the brown rot fungus, Gloeophyllum trabeum. Presented is the least squares means percent weight loss±standard error. The statistical superscripts are symbols generated by the Duncan routine (R. G. D. Steel et al., Principles and Procedures of Statistics—A Biometrical Approach, 3^rd Ed., 1997, McGraw-Hill Series) to determine the statistical significance between treatments. Treatments with the same superscripts (letters) are not significantly different.

FIG. 2 depicts a bar graph illustrating the efficacy of the test wood preservatives to prevent wood decay by the brown rot fungus, Postia placenta. Presented are the least squares means weight loss±standard error. The statistical superscripts were generated by the Duncan routine to determine the statistical significance between treatments. Treatments with the same superscripts (letters) are not significantly different.

Claims

1. A waterborne wood preservation composition, the composition comprising an aqueous carrier and a metal chelate or a metal salt, the metal chelate or metal salt comprising metal ions and a hydroxy analog of methionine.

2. The composition of claim 1, wherein the metal ions are copper ions.

3. The composition of claim 1, wherein the hydroxyl analog of methionine is a compound having formula (II):

4. The composition of claim 1, wherein the hydroxyl analog of methionine is 2-hydroxy-4(methylthio)butanoic acid.

5. The composition of claim 4, wherein the metal ions are copper ions.

6. The composition of claim 5, wherein copper bis(2-hydroxy-4-methylthio)butanoic acid is present in the composition at a concentration from about 0.1% to about 20% by weight.

7. The composition of claim 6, wherein the aqueous carrier is a solvent selected from the group consisting of water, a polar organic solvent, and a water-miscible solvent.

8. The composition of claim 7, wherein the composition further comprises an agent selected from the group consisting of emulsifier, surfactant, dispersants, binders, and fixative.

9. The composition of claim 8, wherein the composition further comprises an additional agent selected from the group consisting of an antioxidant, a fungicide, a bactericide, and an insecticide effective against termites.

10. The composition of claim 1, wherein the metal chelate or metal salt is copper bis(2-hydroxy-4-methylthio)butanoic acid and the aqueous carrier is an ethanolamine water solvent.

11. A method for inhibiting microbial deterioration of wood, the method comprising contacting the wood with a metal chelate or a metal salt, the metal chelate or metal salt comprising metal ions and a hydroxy analog of methionine.

12. The method of claim 11, wherein the metal ions are copper ions.

13. The method of claim 11, wherein the hydroxyl analog of methionine is a compound having formula (II):

14. The method of claim 11, wherein the hydroxyl analog of methionine is 2-hydroxy-4(methylthio)butanoic acid.

15. The method of claim 14, wherein the metal ions are copper ions.

16. The method of claim 15, wherein copper bis(2-hydroxy-4-methylthio)butanoic acid is present in the composition at a concentration from about 0.1% to about 20% by weight.

17. The method of claim 16, wherein the aqueous carrier is a solvent selected from the group consisting of water, a polar organic solvent, and a water-miscible solvent.

18. The method of claim 17, wherein the composition further comprises an agent selected from the group consisting of emulsifier, surfactant, dispersants, binders, and fixative.

19. The method of claim 18, wherein the composition further comprises an additional agent selected from the group consisting of an antioxidant, a fungicide, a bactericide, and an insecticide effective against termites.

20. The method of claim 11, wherein the metal chelate or metal salt is copper bis(2-hydroxy-4-methylthio)butanoic acid and the aqueous carrier is an ethanolamine water solvent.

21. The method of claim 11, wherein the composition is contacted with the wood by a treatment process selected from the group consisting of pressure treatment, soaking, dipping, brushing, and spraying.

22. A wood or wood-containing product, the wood or wood product having a metal chelate or metal salt of a hydroxy analog disposed on or within the wood or wood product.

23. The wood or wood-containing product of claim 22, wherein the metal chelate or metal salt is copper bis(2-hydroxy-4-methylthio)butanoic acid in an ethanolamine water solvent.