Patent ID: 8361210

Claim:
A method for treating wood, comprising bringing the wood into contact with a mixture of liquid or water-soluble organic ammonium carboxylate and an active ingredient which repels invertebrates, wherein the organic ammonium carboxylate has the formula (1): [NR 1 R 2 R 3 R 4 ] + n [R 5 (COO) n ] −n (1) in which R 1 , R 2 and R 3 are selected from the group consisting of hydrogen, substituted and unsubstituted alkyls containing 1-6 carbon atoms, R 4 is a substituted or unsubstituted alkyl containing 1-6 carbon atoms, R 5 is hydrogen, a substituted or unsubstituted hydrocarbon containing 1-6 carbon atoms and n is an integral 1-6 and wherein the wood-preservative active ingredient contains a chelating agent which repels invertebrate, and the chelating agent is selected from the group consisting of an aminopolycarboxylic acid or a salt thereof, a hydroxy acid or a salt thereof or a phosphonate or a salt thereof and a mixture of chelating agents which belong to two of more groups thereof.