Title: Aqueous ammoniacal zinc arsenic or zinc/copper arsenic wood preservative solutions

Abstract: Aqueous ammoniacal wood treating compositions are provided which have a pH of 9 or more. The cations are zinc ammonium or copper ammonium and zinc ammonium ions. The anions include arsenic or arsenious ions, as well as further anions of carbonate and/or bicarbonate. The weight ratio of zinc or zinc and copper (as oxide) to arsenic (as oxide) is greater than 1.5. Preferably, the weight ratio of CO.sub.2 /NH.sub.3 /Zn/As or CO.sub.2 /NH.sub.3 /Zn+Cu/As is 1.7-2.3/5.9-6.7/1.9-2.9/.9. The compositions provide a treated wood product with increased leaching resistance of arsenic. Treating procedures and treated wood products are also provided.

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Inventors: Clarke, Michael R. (Ottawa, CA, US)
Rak, Jaromir R. (Ottawa, CA, US)

Application Number: 568789
Filing Date: 1975-04-16
Publication_date: 1977-07-26
Assignee: Canadian Patents and Development Limited (Ottawa, CA)
Primary Class(es): 106/18.31 106/18.35, 106/18.36, 424/622, 424/623, 424/626, 424/635, 424/641, 427/440
Other Classes:
US Patent Ref:

1632508	Jun, 1927	Schantz	427/291.
2194827	Mar, 1940	Gordon	424/128.
2310257	Feb, 1943	Ritter	106/15.
2414661	Jan, 1947	Nikitin	424/177.

Other Refs: 568,393

Jan, 1959	CA.

Primary Examiner: Hayes, Lorenzo B.
Assistant Examiner:
Attorney: Flynn & Frishauf