Polymeric wood preservative compositions
View Patent ↗The present invention relates to a method and a wood preserving composition which is free of poly-aspartic acid and its derivatives and 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 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 no precipitate is present in the aqueous aqueous preservative composition and wherein said preservative composition is free of polyaspartic acid.
2. The composition of claim 1 further comprising an ammonia salt.
3. The composition of claim 1 further comprising ammonia.
4. The composition of claim 1 wherein the preservative metal is copper bearing material.
5. The composition of claim 4 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, cupric oxide, cuprous oxide, copper borates and mixtures thereof.
6. 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.
7. The composition of claim 1 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 10% by weight.
8. 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.
9. The composition of claim 1 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
10. The composition of claim 1 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
11. The composition of claim 1 wherein the polyethylenimine compound is present at a concentration between about 0.1% and about 2.0% by weight.
12. The composition of claim 1 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 2% by weight.
13. The composition of claim 1 wherein the vinyl based polymer is present at a concentration between about 0.01% and about 8% by weight.
14. 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.
15. The composition of claim 1 further comprising a biocide.
16. The composition of claim 15 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
17. The composition of claim 16 wherein the fungicide is selected from the group consisting of azoles, quatemary ammonium compounds and mixtures thereof.
18. The composition of claim 1 wherein the cellulose based product is wood.
19. An aqueous preservative composition for treating a cellulose-based product, 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);
wherein said aqueous preservative composition is free of polyaspartic acid.
20. The composition of claim 19 wherein the cellulose based product is wood.
21. A method for treating a cellulose based product, said method comprising:
applying to the cellulose based product an aqueous preservative 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;
wherein no precipitate is present in the aqueous aqueous preservative composition, and wherein said preservative composition is free of polyaspartic acid.
22. The method of claim 21 wherein the aqueous preservative composition further comprises an ammonia salt.
23. The method of claim 21 wherein the aqueous preservative composition further comprises ammonia.
24. The method of claim 21 wherein the preservative metal is a copper bearing material.
25. The method of claim 24 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, cupric oxide, cuprous oxide, copper borates and mixtures thereof.
26. The method of claim 21 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.
27. The method of claim 21 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
28. The method of claim 21 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
29. The method of claim 21 wherein the polyethylenimine compound is present at a concentration between about 1.0% and about 40.0% by weight.
30. The method of claim 21 wherein the vinyl based polymer is present at a concentration between about 0.01% and about 8% by weight.
31. The method of claim 21 wherein the aqueous preservative composition further comprises a biocide.
32. The method of claim 31 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
33. The method of claim 32 wherein the fungicide is selected from the group consisting of azoles, quatemary ammonium compounds and mixtures thereof.
34. The method of claim 21 wherein the cellulose based product is flooded with the preservative composition under vacuum.
35. The composition of claim 21 wherein the cellulose based product is wood.
36. 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;
one member of the group consisting of: a non-polymeric amine compound in an amount sufficient to solubilize the preservative metal and a polyethyleniniine 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 no precipitate is present in the aqueous preservative composition and wherein said aqueous preservative composition is free of polyaspartic acid.
37. The composition of claim 36 further comprising an ammonia salt.
38. The composition of claim 36 further comprising ammonia.
39. The composition of claim 36 wherein the preservative metal is copper bearing material.
40. The composition of claim 39 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, cupric oxide, cuprous oxide, copper borates and mixtures thereof.
41. The composition of claim 36 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.
42. The composition of claim 36 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 50% by weight.
43. The composition of claim 36 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 7.20% by weight.
44. The composition of claim 36 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
45. The composition of claim 36 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
46. The composition of claim 36 wherein the polyethylenimine compound is present at a concentration between about 0.1% and about 2.0% by weight.
47. The composition of claim 36 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 2% by weight.
48. The composition of claim 36 wherein the vinyl based polymer is present at a concentration between about 0.01% and about 30% by weight.
49. The composition of claim 36 wherein the vinyl based polymer is present at a concentration of from about 0.1% to about 1% by weight.
50. The composition of claim 36 further comprising a biocide.
51. The composition of claim 36 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
52. The composition of claim 36 wherein the fungicide is selected from the group consisting of azoles, quaternary ammonium compounds and mixtures thereof.
53. The composition of claim 36 wherein the cellulose based product is wood.
54. A method for treating a cellulose based product, said method comprising:
applying to the cellulose based product an aqueous preservative 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;
one member of the group consisting of: a non-polymeric amine compound in an amount sufficient to solubilize the preservative metal and 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 no precipitate is present in the aqueous preservative composition, and wherein said aqueous preservative composition is free of polyaspartic acid.
55. The method of claim 54 wherein the aqueous preservative composition further comprises an ammonia salt.
56. The method of claim 54 wherein the aqueous preservative composition further comprises ammonia.
57. The method of claim 54 wherein the preservative metal is a copper bearing material.
58. The method of claim 57 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, cupric oxide, cuprous oxide, copper borates and mixtures thereof.
59. The method of claim 54 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.
60. The method of claim 54 wherein the polyethylenimine compound has a molecular weight between about 100 and about 70,000.
61. The method of claim 54 wherein the polyethylenimine compound is present at a concentration between about 0.01% and about 40.0% by weight.
62. The method of claim 54 wherein the polyethylenimine compound is present at a concentration between about 0.1% and about 2.0% by weight.
63. The composition of claim 54 wherein the non-polymeric amine is present at a concern between about 0.15% and about 50% by weight.
64. The composition of claim 54 wherein the non-polymeric amine is present at a concentration between about 0.15% and about 7.20% by weight.
65. The method of claim 54 wherein the vinyl based polymer is present at a concentration between about 0.01% and about 30% by weight.
66. The method of claim 54 wherein the aqueous preservative composition further comprises a biocide.
67. The method of claim 54 wherein the biocide is selected from the group consisting of fungicides, insecticides and mixtures thereof.
68. The method of claim 67 wherein the fungicide is selected from the group consisting of azoles, quaternary ammonium compounds and mixtures thereof.
69. The method of claim 54 wherein the cellulose based product is flooded with the preservative composition under vacuum.
70. The composition of claim 54 wherein the cellulose based product is wood.