Back to results
US 5,612,142 AGranted
Preservation of wood with phenol formaldehyde resorcinol resins
AssigneePolymer Wood Processors, Inc.
InventorJean Lewis, deceased
Life of this patent
Estimating the term…
Abstract
Wood and other cellulose-based products are preserved with a water-based treating solution containing a phenolic resin prepolymer such as phenol formaldehyde resin prepolymer, a resorcinol formaldehyde resin prepolymer and water. The treatment is carried out by exposing the wood or other cellulose-based product, while submerged in the treating solution, to one or more cycles of reduced pressure (i.e. vacuum) and elevated pressure.
Claims14
A method of treating wood by penetration of a treating solution, 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 solution comprising a phenolic resin prepolymer, a resorcinol formaldehyde resin prepolymer, and water;
- (c) maintaining the wood immersed in the treating solution under pressures below atmospheric pressure until the solution has penetrated into the wood;
- (d) increasing the pressure above the solution to a pressure above atmospheric to thereby increase the penetration of the wood by said treating solution;
- and
- (e) recovering treated wood.
3 more elements
Dependencies are inferred from the claim text.