Patent ID: 6896908
Filing Date: 2005-05-24
Classification: A01N,B27K,Y10S

Abstract:
1. An aqueous-based preservative concentrate for use in treating lignocellulosic-based materials comprising: (a) a borate selected from the group consisting of ammonium borate and alkali metal borate, wherein the concentration of said borate, expressed as sodium tetraborate decahydrate equivalent, comprises at least about 15% by weight of the concentrate, (b) a source of metal, wherein said metal is selected from the group consisting of copper, zinc and a combination thereof, and wherein the concentration of said metal, expressed as metal oxide equivalent (CuO and/or ZnO), comprises at least about 5% by weight of the concentrate, (c) a volatile organic acid or salt thereof, wherein said acid has a boiling point below about 150° C., and wherein the molar ratio of the volatile organic acid to said metal is in the range of about 0.1 to 0.4:1, (d) a source of free ammonia, (e) an ammonium salt, (f) a source of carbonate, and (g) water wherein the weight ratio of the borate, expressed as sodium tetraborate decahydrate, to the metal, expressed as metal oxide, is at least 1:1, the concentration of total ammonia, including the sum of free ammonia and ammonia as ammonium salt, is at least 5% by weight of the concentrate, and wherein said concentrate has a pH greater than 8.0.