Patent ID: 7252706

Claim:
A method of preserving wood comprising: contacting wood with an aqueous solution of a wood preservative composition comprising copper-amine complex; one or more alkaline earth metal ions; and a precipitation inhibitor selected from hydroxyethylidene-diphosphonic acid (HEDP) or a salt thereof; 2-phosphonobutane-1,2,4-tricarboxylic acid (PBTC) or a salt thereof; a compound having a plurality of phosphonate moieties, wherein the phosphorus atoms of the phosphonate moieties are separated by at least two carbon atoms, wherein the at least two carbon atoms are not linked to nitrogen atoms; a compound having at least one phosphonate moiety and one or more carboxylate moieties, wherein the phosphorus atom of the at least one phosphonate moiety and the one or more carboxylate moieties are separated by at least two carbon atoms; and mixtures thereof.