Patent ID: 9603358
Date: 2017-03-28
CPC Classifications: A01N,B27K,Y10T

Claim:
1. A wood preservative formulation, comprising: a biocidal agent which comprises 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 cationic polymer or copolymer having one or more of the following repeating units selected from the group consisting of: (i) repeating units of formula (I) (ii) repeating units of formula (II) (iii) repeating units of formula (III) (iv) repeating units of formula (IV) in which n=3 to 5000, n 1 =0, 1 or 2, n 2 =0 or 1, n 3 =2 or 3 and when n=3 the nitrogen atom carries a positive charge and a counter ion X − is present, R x groups, which can be identical or different, are hydrogen or a straight chain, branched or cyclic alkyl, alkenyl, alkynyl, alkanoxyl, aryl, —(C═O)H, —(C═O)R, —CO 2 H—CO 2 R, —CH 2 CO 2 H, —CH 2 CO 2 R, —CH 2 NRR, —(C═O)NRR, —CN, —(CH 2 ) n —O—R, in which; R groups, which can be identical or different, are hydrogen or a straight chain, branched or cyclic alkyl, alkenyl, alkynyl, alkanoxyl or aryl, n 4 =2 or 3, R y is a divalent group having one or more of the following groups V 1 -V 8 in which R z , is H, OH, or N(R x )n 3 , a is 1 to 20, and X − is an anion, or mixtures of the cationic polymer or copolymer; wherein the cationic polymer or copolymer 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; wherein the amount of the cationic polymer or copolymer is less than the copper or zinc ion on a weight to weight basis; and wherein the cationic polymer or copolymer and the copper or zinc ion are in a ratio of about 1:600 to about 1:6 on a weight to weight basis.