Polymeric wood preservative compositions
AssigneeOsmose, Inc.
InventorsJun Zhang, Robert M. Leach, Paul Griffin
Life of this patent
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Abstract
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.
Claims70
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.
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.
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.
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.
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.
Dependencies are inferred from the claim text.