Metal salts of hydrolyzed olefin/maleic anhydride copolymers and their use as wood preservatives
View Patent ↗Complexes of copper and/or zinc with hydrolyzed olefin/maleic anhydride copolymers were solubilized in ammoniacal solution providing preservative solutions that fully penetrate wood. With loss of the ammonia from the wood, the complexes were stably retained in the wood providing a long lasting preservative.
1. An aqueous composition comprising in admixture (a) a complex comprising (i) copper ions, zinc ions or a mixture thereof, and (ii) a hydrolyzed olefin/maleic anhydride copolymer having a molecular weight in the range of about 10,000 to about 50,000; and (b) ammonia and/or ethanolamine; wherein component (b) is present in an amount sufficient to solubilize the complex.
2. The composition of claim 1 wherein the copolymer is a hydrolyzed octene/maleic anhydride copolymer, a hydrolyzed styrene/maleic anhydride copolymer, or a mixture thereof.
3. The composition of claim 1 wherein component (b) comprises ammonia and ethanolamine.
4. The composition of claim 1 wherein the 10 000 to 50.000 molecular weight is weight average molecular weight.
5. The composition of claim 1 which further comprises a component (c) selected from one or both of an additional antifungal component and an additional termiticidal component.
6. The composition of claim 5 wherein the component (c) is selected from the group consisting of tungstate ion, molybdate ion, ibuprofen, a tropolone, and combinations thereof.
7. The composition of claim 5 wherein the component (c) comprises tungstate ion or molybdate ion.
8. A process for preserving cellulosic material, or an article that comprises cellulosic material, comprising contacting the cellulosic material or article with the composition of claim 1 .
9. The process of claim 8 wherein the cellulosic material is selected from the group consisting of wood, lumber, plywood, oriented strand board, cellulose, hemicellulose, lignin, cotton, and paper.
10. The process of claim 8 which comprises dipping, brushing, spraying, draw-coating, rolling, or pressure-treating the cellulosic material or article with the composition of claim 1 .
11. The process of claim 8 wherein the cellulosic material is wood or lumber.
12. The process of claim 11 further comprising subjecting wood or lumber to a vacuum before and/or after it is contacted with the composition.
13. The process of claim 8 further comprising a step of incorporating the cellulosic material or the article into a structure or into a consumable device.
14. Cellulosic material, or an article comprising a cellulosic material, wherein the composition of claim 1 is adsorbed on and/or absorbed in the cellulosic material.
15. The material or article of claim 14 wherein the cellulosic material is selected from the group consisting of wood, paper, cellulose, cotton, lignin, and hemicellulose.
16. The material or article of claim 14 wherein the copolymer is a hydrolyzed octene/maleic anhydride copolymer, a hydrolyzed styrene/maleic anhydride copolymer, or a mixture thereof.
17. The composition of claim 1 wherein the 10,000 to 50,000 molecular weight is number average molecular weight.
18. The material or article of claim 14 wherein the composition further comprises at least one component selected from the group consisting of tungstate ion, molybdate ion, ibuprofen, a tropolone, and combinations thereof.
19. The material or article of claim 14 wherein the composition further comprises tungstate ion or molybdate ion.
20. A structure or consumable device comprising the cellulosic material or article of claim 14 .