Wood preservative composition

1. A composition resulting from admixing components comprising: at least one preservative metal; a quaternary ammonium compound; at least 2 amine compounds; and a pH reducing agent, and water, wherein the pH of the composition is from about 7.1 to less than 8.5, wherein the pH reducing agent comprises an aliphatic monocarboxylic acid having from 2 to 6 carbon atoms, and wherein the amine compounds comprise monoethanolamine and triethanolamine.

2. The composition of claim 1 , wherein the concentration of the amine compounds is from about 1 to about 40 wt %, based on the weight of the composition.

3. The composition of claim 1 , wherein pH reducing agent comprises at least one of oxalic acid or citric acid.

4. The composition of claim 1 wherein the quaternary ammonium compound is represented by the general formula (R 1 R 2 R 3 R 4 N + )X − , where R 1 and R 2 are independently chosen from the group consisting of alkyl groups having 1 to 3 carbon atoms, R 3 is chosen from the group consisting of alkyl groups having 8 to 20 carbon atoms, R 4 is chosen from the group consisting of alkyl groups having 8 to 20 carbon atoms, aryl groups and aryl-substituted alkyl groups where the substituted alkyl groups have 1-3 carbon atoms, and X − is an anion.

5. The composition of claim 1 , wherein the pH is from about 7.8 to less than about 8.5.

6. The composition of claim 1 wherein a biocidally effective amount of at least one quaternary ammonium compound is employed, the preservative metal is a biocidally effective amount of at least one salt of copper or zinc, and wherein a ratio of the quaternary ammonium compound to a cation of the copper or zinc salt ranges from about 0.003 to about 30.

7. A composition resulting from admixing components comprising:

A. from about 0.5 to about 15 weight parts of a copper salt, a zinc salt or a mixture thereof;

B. from about 0.1 to about 10 weight parts of a quaternary ammonium compound;

C. an amount of a pH reducing agent that is sufficient to result in the composition having a pH of from about 7.1 to less than 8.5, wherein the pH reducing agent comprises at least one of oxalic acid or citric acid;

D. from about 0.1 to about 4 weight parts of triethanolamine;

E. from about 1 to about 40 weight parts of monoethanolamine; and

F. water;

wherein the sum of components A-F equals 100 weight parts, and wherein the composition has a pH of from about 7.1 to less than 8.5.