Polymeric wood preservative compositions
View Patent ↗The present invention relates to a method and a wood preserving composition which comprises mixtures of a metal compound, complexing agents selected from ethanolamines, polyethylenimine, ammonia or a mixture of these compounds, and a vinyl based polymer selected from poly(vinyl alcohol) (PVA), poly(acrylamide) (PA), poly(N-vinyl pyrrolidone) (PVP) and poly(N-isopropyl acrylamide) (PNIPAM). The resulting metal amine solution can then be used to formulate a variety of metal-based cellulosic material preserving products.
1. An aqueous preservative composition for treating a cellulose based products, said composition comprising:
a preservative metal selected from the group consisting of copper, cobalt, aluminum, iron, lead, tin, cadmium, nickel, chromium, silver, zinc and mixtures thereof in a preservative amount;
a non-polymeric amine compound in an amount sufficient to solubilize the preservative metal;
a polyethylenimine compound in an amount sufficient to form a chelation complex with the metal;
a vinyl based polymer selected from the group consisting of poly(vinyl alcohol), polyacrylamide, poly(N-vinyl pyrrolidone), poly(N-isopropyl acrylamide) and mixtures thereof; and
ammonia or an ammonia salt;
wherein no precipitate is present in the aqueous preservative composition.
2. The composition of claim 1 wherein the preservative metal is copper, said copper being present as a copper bearing material.
3. The composition of claim 2 wherein the copper bearing material is selected from the group consisting of copper metal, copper sulfate, copper acetate, copper formate, copper chloride, copper nitrate, basic copper carbonate, copper hydroxide, copper borates and mixtures thereof.
4. The composition of claim 1 wherein the non-polymeric amine is selected from the group consisting of triethanolamine, ethylamine, diethylamine, ethylenediamine, ethanolamines having the following structural formula I:
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 independently=H, —CH 3 , or —C 2 H 5 ; and mixtures thereof.
5. The composition of claim 1 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 10% by weight.
6. The composition of claim 1 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 7.20% by weight.
7. The composition of claim 1 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
8. The composition of claim 1 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
9. The composition of claim 1 wherein the polyethylenimine compound is present at a concentration between about 0.1% and about 2.0% by weight.
10. The composition of claim 1 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 2% by weight.
11. The composition of claim 1 wherein the vinyl based polymer is present at a concentration of from about 0.1% to about 1% by weight.
12. The composition of claim 1 further comprising a biocide.
13. The composition of claim 12 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
14. The composition of claim 13 wherein the fungicide is selected from the group consisting of azoles, quaternary ammonium compounds and mixtures thereof.
15. The composition of claim 1 wherein the cellulose based product is wood.
16. An aqueous preservative composition for treating a cellulose based products, said composition comprising:
between about 0.01% and about 15% by weight solubilized copper;
between about 0.15% and about 10% by weight non-polymeric amine;
between about 0.01% and about 40% by weight polyethylenimine having a number average molecular weight between about 100 and about 70,000; and
between about 0.01% and about 8% poly(vinyl alcohol).
17. The composition of claim 16 wherein the cellulose based product is wood.
18. A method for treating a cellulose based product, said method comprising:
applying to the product an aqueous preservative composition for treating a cellulose based product, said composition comprising:
a preservative metal selected from the group consisting of copper, cobalt, aluminum, iron, lead, tin, cadmium, nickel, chromium, silver, zinc and mixtures thereof in a preservative amount;
a non-polymeric amine compound in a solubilizing amount;
a polyethylenimine compound in a chelation complex forming amount;
a vinyl based polymer selected from the group consisting of poly(vinyl alcohol), polyacrylamide, poly(N-vinyl pyrrolidone), poly(N-isopropyl acrylamide) and mixtures thereof; and
ammonia or an ammonium salt;
wherein no precipitate is present in the aqueous preservative composition.
19. The method of claim 18 wherein the preservative metal is copper, said copper being present as a copper bearing material.
20. The method of claim 19 wherein the copper bearing material is selected from the group consisting of copper metal, copper sulfate, copper acetate, copper formate, copper chloride, copper nitrate, basic copper carbonate, copper hydroxide, copper borates and mixtures thereof.
21. The method of claim 18 wherein the non-polymeric amine is selected from the group consisting of triethanolamine, ethylamine, diethylamine, ethylenediamine, ethanolamines having the following structural formula I:
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 independently=H, —CH 3 , or —C 2 H 5 ; and mixtures thereof.
22. The method of claim 18 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
23. The method of claim 18 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
24. The method of claim 18 wherein the polyethylenimine compound is present at a concentration between about 1.0% and about 40.0% by weight.
25. The method of claim 18 wherein the aqueous preservative composition further comprises a biocide.
26. The method of claim 25 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
27. The method of claim 26 wherein the fungicide is selected from the group consisting of azoles, quaternary ammonium compounds and mixtures thereof.
28. The method of claim 18 wherein the cellulose based product is flooded with the preservative composition under vacuum.
29. The method of claim 18 wherein the cellulose based product is wood.
30. An aqueous preservative composition for treating a cellulose based product, said composition comprising:
a preservative metal selected from the group consisting of copper, cobalt, aluminum, iron, lead, tin, cadmium, nickel, chromium, silver, zinc and mixtures thereof in a preservative amount;
a non-polymeric amine compound in an amount sufficient to solubilize the preservative metal;
a polyethylenimine compound in an amount sufficient to form a chelation complex with the metal; and
a vinyl based polymer selected from the group consisting of poly(vinyl alcohol), polyacrylamide, poly(N-vinyl pyrrolidone), poly(N-isopropyl acrylamide) and mixtures thereof;
wherein said vinyl based polymer is present at a concentration between about 0.01% and about 8% by weight, and wherein no precipitate is present in the aqueous preservative composition.
31. The composition of claim 30 wherein the preservative metal is copper, said copper being present as a copper bearing material.
32. The composition of claim 31 wherein the copper bearing material is selected from the group consisting of copper metal, copper sulfate, copper acetate, copper formate, copper chloride, copper nitrate, basic copper carbonate, copper hydroxide, copper borates and mixtures thereof.
33. The composition of claim 30 wherein the non-polymeric amine is selected from the group consisting of triethanolamine, ethylamine, diethylamine, ethylenediamine, ethanolamines having the following structural formula I:
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 independently=H, —CH 3 , or —C 2 H 5 ; and mixtures thereof.
34. The composition of claim 30 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 7.20% by weight.
35. The composition of claim 30 wherein the polyethylenimine compound has a molecular eight between about 100 and about 70,000.
36. The composition of claim 30 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
37. The composition of claim 30 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
38. The composition of claim 30 wherein the polyethylenimine compound is present at a concentration between about 0.1% and about 2.0% by weight.
39. The composition of claim 30 further comprising a biocide.
40. The composition of claim 39 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
41. The composition of claim 40 wherein the fungicide is selected from the group consisting of azoles, quaternary ammonium compounds and mixtures thereof.
42. The composition of claim 30 wherein the cellulose based product is wood.
43. A method for treating a cellulose based product said method comprising:
applying to the product an aqueous preservative composition for treating cellulose based products, said composition comprising:
a preservative metal selected from the group consisting of copper, cobalt, aluminum, iron, lead, tin, cadmium, nickel, chromium, silver, zinc and mixtures thereof in a preservative amount;
a non-polymeric amine compound in a solubilizing amount;
a polyethylenimine compound in a chelation complex forming amount; and
a vinyl based polymer selected from the group consisting of poly(vinyl alcohol), polyacrylamide, poly(N-vinyl pyrrolidone), poly(N-isopropyl acrylamide) and mixtures thereof; and
ammonia or an ammonia salt;
wherein said vinyl based polymer is present at a concentration between about 0.01% and about 8% by weight, and wherein no precipitate is present in the aqueous wood preservative composition.
44. The method of claim 43 wherein the preservative metal is copper, said copper being present as a copper bearing material.
45. The method of claim 44 wherein the copper bearing material is selected from the group consisting of copper metal, copper sulfate, copper acetate, copper formate, copper chloride, copper nitrate, basic copper carbonate, copper hydroxide, copper borates and mixtures thereof.
46. The method of claim 43 wherein the non-polymeric amine selected from the group consisting of triethanolamine, ethylamine, diethylamine, ethylenediamine, ethanolamines having the following structural formula I:
wherein R 1 , R 2 , R 3 , R 4 , R 5 , R 6 independently=H, —CH 3 , or —C 2 H 5 ; and mixtures thereof.
47. The method of claim 43 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
48. The method of claim 43 wherein the polyethylenimine compound is present at a concentration between about 1.0% and about 40.0% by weight.
49. The method of claim 43 wherein the aqueous preservative composition further comprises a biocide.
50. The method of claim 49 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
51. The method of claim 50 wherein the fungicide is selected from the group consisting of azoles, quaternary ammonium compounds and mixtures thereof.
52. The method of claim 43 wherein the cellulose based product is flooded with the preservative composition under vacuum.
53. The method of claim 43 wherein the cellulose based product is wood.