Preservative composition for wood
AssigneeOsmose Wood Preserving Co. of America, Inc.
InventorsRobert M. Leach, Richard J. Ziobro
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Abstract
The present invention provides a method and composition for preserving wood and other cellulose based materials against destructive organisms responsible for rot and decay, namely fungus and insects. The composition comprises an aqueous ammoniacal solution of a preservative metal compound and an organic acid selected from the group consisting of aliphatic dicarboxylic acids containing 2-10 carbon atoms per molecule, aliphatic mono, di or tricarboxylic hydroxy acids containing 2-6 carbon atoms per molecule or a mixture of these acids and/or their salts. The preservative composition may be applied by dipping, soaking, spraying, brushing or by any other well known means including vacuum and/or pressure applications.
Claims34
An aqueous, alkaline preservative composition for treating cellulose based products including wood to protect such products from insect attack in addition to fungal attack, said composition comprising:
- (a) a preservative metal selected from the group consisting of copper, cobalt, cadmium, nickel and zinc and compounds and mixtures thereof in a preservative amount;
- (b) an organic acid in a preservative amount selected from the group consisting of straight chain:
- aliphatic dicarboxylic acids containing 2-10 carbon atoms per molecule, aliphatic monocarboxylic hydroxy acids containing 2-6 carbon atoms per molecule, aliphatic dicarboxylic hydroxy acids containing 2-6 carbon atoms per molecule, aliphatic tricarboxylic hydroxy acids containing 2-6 carbon atoms per molecule, salts of said organic acids and mixtures of said organic acids, salts of said organic acids and said salts and said acids;
- and
- (c) an ammonia containing compound capable of providing sufficient ammonia to solubilize said preservative metal, metal compounds or mixtures thereof and neutralize said organic acids, said composition having a molar ratio of organic acid to metal between about 0.1 to about 4.0 depending upon the preservative effect desired and the pH of said composition in the range of from about 9 to about 12.
A method for treating cellulose based products including wood to protect such products from insect attack in addition to fungal attack which comprises contacting said products with an aqueous, alkaline preservative solution comprising:
- (a) a preservative metal selected from the group consisting of copper, cobalt, cadmium, nickel and zinc and compounds and mixtures thereof in a preservative amount;
- (b) an organic acid in a preservative amount selected from the group consisting of straight chain:
- aliphatic dicarboxylic acids containing 2-10 carbon atoms per molecule, aliphatic monocarboxylic hydroxy acids containing 2-6 carbon atoms per molecule, aliphatic dicarboxylic hydroxy acids containing 2-6 carbon atoms per molecule, aliphatic tricarboxylic hydroxy acids containing 2-6 carbon atoms per molecule, salts of said organic acids and mixtures of said organic acids, salts of said organic acids and said salts and said acids;
- and
- (c) an ammonia containing compound capable of providing sufficient ammonia to solubilize said preservative metal, metal compounds or mixtures thereof and neutralize said organic acid, said composition having a molar ratio of organic acid to metal between about 0.1 to about 4.0 depending upon the preservative effect desired and the pH of said composition in the range of from about 9 to about 12.
Dependencies are inferred from the claim text.