Preservation of wood
AssigneeCherokee Industries, Inc.
InventorWilliam R. Allen, Sr.
Life of this patent
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Abstract
Wood is preserved with a water-based treating solution containing a halogenated phenol wood preservative such as pentachlorphenol, a phenolic resin prepolymer such as a phenol formaldehyde prepolymer, and a coupling or solubilizing agent for enhancing the water compatibility of the various ingredients. The treatment is carried out by exposing the wood, while submerged in the treating solution, so one or more cycles of reduced pressure (i.e. vacuum) and elevated pressure.
Claims31
An aqueous water-dilutable concentrate suitable for treating wood by deep penetration, said concentrate consisting essentially of:
- (a) an effective wood preserving amount of a halogenated phenol wood preservative;
- (b) an effective amount of a phenolic resin prepolymer which after curing is sufficient to prevent the migration of the halogenated phenol from the wood;
- and
- (c) a polar cosolvent coupling agent present in an effective amount sufficient for enhancing the water solubility of said concentrate.
A water dilutable concentrate for treating wood, said concentrate having a solids content of at least 10% by weight and consisting essentially of:
- (a) penta chloro phenol;
- (b) phenol formaldehyde prepolymer, the weight ratio of penta chloro phenol to prepolymer being from 1:2 to 1:10;
- (c) methyl alcohol;
- (d) water;
- and
- (e) from 0 to 5% by weight of at least one surfactant.
The method of treating wood by deep penetration of a treating composition, said method comprising the steps of:
- (a) placing the wood to be treated in an evacuation zone and exposing the wood to pressures below atmospheric pressure for a time sufficient to remove moisture and other volatiles from the wood;
- (b) immersing the wood in a water based treating composition consisting essentially of a halogenated phenol wood preservative, a phenolic resin prepolymer, and a coupling agent;
- (c) maintaining the wood immersed in the treating composition under said reduced pressure until the solution has penetrated into the wood;
- (d) increasing the pressure above the liquid to a pressure above atmospheric to thereby increase the penetration of the wood by said treating agent;
- and
- (e) recovering treated wood.
Dependencies are inferred from the claim text.