Additives for use in wood preservation

Abstract

The present invention relates to a wood preservative formulation comprising a biocidal agent which is a copper or zinc ion complexed with an amino compound selected from the group consisting of ammonia, a water soluble amine or alkanolamine and an aminocarboxylic acid and a stabilizer, as well as to aqueous treatment solutions comprising such a formulation and methods of treating wood or other cellulosic material utilising said formulation.

1 . A wood preservative formulation, comprising:
 a biocidal agent which comprises a copper ion or a zinc ion complexed with an amino compound selected from the group consisting of ammonia, a water soluble amine or alkanolamine, and an aminocarboxylic acid; and   a stabilizer polymer, wherein the stabilizer polymer is present in an amount to inhibit the anti-penetrative effects of anionic by-products and timber extractives present in the preservative formulation thereby improving the ability of the wood preservative component to penetrate a wood substrate intended to be protected by the wood preservative formulation, and   wherein the amount of the stabilizer polymer is less than the copper or zinc ion.   
     
     
         2 . The wood preservative formulation of  claim 1 , wherein the stabilizer polymer is a dialkyldimethyl quaternary ammonium compound. 
     
     
         3 . The wood preservative formulation of  claim 1 , wherein the stabilizer polymer is a didecyl dimethyl ammonium compound. 
     
     
         4 . The wood preservative formulation of  claim 1 , wherein the formulation contains 0.01 to 4% by weight based on the total weight of the formulation. 
     
     
         5 . The wood preservative formulation of  claim 1 , wherein the amino compound is monoethanolamine or ammonia. 
     
     
         6 . The wood preservative formulation of  claim 1 , further comprising an azole compound. 
     
     
         7 . The wood preservative formulation of  claim 1 , wherein the stabilizer polymer is selected from the group consisting of:
 poly vinyl formamides,   poly amides,   poly vinyl amides,   polyamines,   poly vinyl amines (PVAm),   poly diallyldimethyl ammonium chlorides (DADMAC's),   poly allyl amines (PAAm),   poly diallyldimethyl ammonium chlorides (DADMAC) Sulphones, and   copolymers of vinyl amine and vinyl formamide.   
     
     
         8 . The wood preservative formulation of  claim 1 , wherein the stabilizer polymer has a molecular weight between 1,000 and 100,000. 
     
     
         9 . The wood preservative formulation of  claim 1 , wherein the stabilizer polymer has a molecular weight between 1,000 and 50,000. 
     
     
         10 . The wood preservative formulation of  claim 1 , wherein the stabilizer polymer is a polyamine, with a molecular weight of 2,000 to 4,000. 
     
     
         11 . The wood preservative formulation of  claim 1 , wherein the formulation is an aqueous solution. 
     
     
         12 . A substrate of wood or other cellulosic material treated with the wood preservative formulations as defined in  claim 1 . 
     
     
         13 . A wood preservative formulation, comprising:
 a biocidal agent which comprises a copper ion complexed with an amino compound selected from the group consisting of ammonia, a water soluble amine or alkanolamine, and an aminocarboxylic acid; and   a stabilizer polymer, wherein the stabilizer polymer is present in an amount to inhibit the anti-penetrative effects of anionic by-products and timber extractives present in the preservative formulation thereby improving the ability of the wood preservative component to penetrate a wood substrate intended to be protected by the wood preservative formulation, and   wherein the amount of the stabilizer polymer is less than the copper ion.   
     
     
         14 . The wood preservative formulation of  claim 13 , wherein the stabilizer polymer is a dialkyldimethyl quaternary ammonium compound. 
     
     
         15 . The wood preservative formulation of  claim 13 , wherein the stabilizer polymer is a didecyl dimethyl ammonium compound. 
     
     
         16 . The wood preservative formulation of  claim 13 , wherein the formulation is an aqueous solution. 
     
     
         17 . A method of stabilizing a wood treatment formulation that contains a copper or zinc ion complexed with an amino compound selected from the group consisting of ammonia, a water soluble amine or alkanolamine, and an aminocarboxylic acid, comprising:
 providing a stabilizer polymer for addition to the wood treatment formulation, wherein the stabilizer polymer is present in an amount to inhibit the anti-penetrative effects of anionic by-products and timber extractives present in the preservative formulation thereby improving the ability of the wood preservative component to penetrate a wood substrate intended to be protected by the wood preservative formulation, and wherein the amount of the stabilizer polymer is less than the copper or zinc ion.   
     
     
         18 . The method of  claim 17 , wherein the wood treatment further comprises an azole. 
     
     
         19 . The method of  claim 17 , wherein the stabilizer polymer is a didecyl dimethyl ammonium compound. 
     
     
         20 . The method of  claim 17 , wherein the stabilizer polymer is selected from the group consisting of:
 poly vinyl formamides,   poly amides,   poly vinyl amides,   polyamines,   poly vinyl amines (PVAm),   poly diallyldimethyl ammonium chlorides (DADMAC's),   poly allyl amines (PAAm),   poly diallyldimethyl ammonium chlorides (DADMAC) Sulphones, and   copolymers of vinyl amine and vinyl formamide.