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US 7,842,656 B2Granted
Wood treatment method
AssigneeRohm and Haas Company
InventorsJohn William Ashmore, David Michael Laganella, Tirthankar Ghosh, Nilesh Shah
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Abstract
A method for treating wood to inhibit leaching of copper compounds into the environment. The method comprises treating the wood with a copper-containing wood preservative and a latex copolymer.
Claims9
A method for treating wood;
- said method comprising adding to wood:
- (a) a copper-containing wood preservative;
- and
- (b) a latex copolymer comprising polymerized units of a monomer X and a monomer Y;
- wherein the latex copolymer comprises at least 5 wt % of monomer X derived units;
- wherein the latex copolymer comprises no more than 1,000 ppm residual monomer X;
- wherein monomer X is N-vinylimidazole;
- wherein monomer Y is selected from carboxylic acids, carboxylic acid salts, carboxylic acid esters, organosulfuric acids, organosulfuric acid salts, sulfonic acids, sulfonic acid salts, phosphonic acids, phosphonic acid salts, vinyl esters, (meth)acrylamides, C8-C20 aromatic monomers containing at least one exocyclic ethylenic unsaturation or combinations thereof.
5 more elements
Dependencies are inferred from the claim text.