Patent ID: 7842656

Claim:
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, C 8 -C 20 aromatic monomers containing at least one exocyclic ethylenic unsaturation or combinations thereof.