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US 4,988,576 AGranted
Wood preservative
AssigneeDaishowa Chemicals Inc.
InventorsStephen Y. Lin, Lori L. Bushar
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AssigneeDaishowa Chemicals Inc.
InventorsStephen Y. Lin, Lori L. Bushar
Estimating the term…
A wood preservative composition comprising a lignosulfonate copolymer and a metal salt or a combination of metal salts. The copolymer is a reaction product of lignosulfonate and acrylic monomers selected from a group of acrylic compounds of the general formula, RCH=CR.sup.1 COOH, where R is hydrogen, an alkyl or carboxyl group and R.sup.1 is hydrogen or an alkyl group, and the metal salt is a salt of sulfate, chloride, phosphate, or carbonate wherein the metal is selected from the group consisting of copper, zinc, mercury and lead. Alternatively, the composition may be a metal salt or a combination of metal salts of a lignosulfonate copolymer produced by base exchange of the corresponding calcium lignosulfonate copolymer with a metal salt or metal salts. The composition may be used, optionally, together with methylol phenol.
As a composition of matter, a novel wood preservative composition containing a graft copolymer of lignosulfonate, hydroxyl benzyl alcohol and a metal salt or a mixture of metal salts in the ratio of from 1:0:0.01 to 1:0.5:1.2, respectively, said graft copolymer is a reaction product of lignosulfonate and acrylic monomers of the general formula:
A novel composition useful for preserving wood comprising at least one metal salt of a graft copolymer of lignosulfonate, said metal is selected from the group of copper, zinc, mercury and lead, and said copolymer is a reaction product of lignosulfonate and acrylic monomers of the general formula:
Dependencies are inferred from the claim text.