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US 10,500,756 B2Granted
Methods of conferring fire retardancy to wood and fire-retardant wood products
AssigneeKoppers Performance Chemicals Inc.
InventorsJun Zhang, John Horton, Xinhao H. Gao
Life of this patent
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Abstract
A process is provided for treating wood products including lumber, plywood and other engineered wood products comprising the steps of applying an aqueous fire-retardant impregnate and applying a coating to the surface of the wood product. In one embodiment, said process confers fire-retardant properties to the wood products sufficient to pass the extended burn test of ASTM E-84. The present invention also provides fire retardant wood products.
Claims12
A method of treating an engineered wood product comprising the steps of:
- applying an aqueous fire-retardant impregnate by pressure or vacuum treatment or microwave treatment to an engineered wood product with a thickness of approximately ½ inch in an amount of about 1 to about 4.5 pcf, such that the impregnate penetrates the engineered wood product;
- and
- applying a coating to the engineered wood product surface in an amount of about 0.04 to about 0.11 lbs/ft2;
- wherein said coating is an intumescent coating comprising a polymer binder, a source of mineral acid catalyst, a source of carbon, and a source of non-flammable gas;
- and
- wherein said polymer binder is selected from the group consisting of a dispersion of a thermoplastic polymer, a thermosetting polymeric resin, a film forming polymeric resin, an aqueous dispersion of polyamide resins, polyethylene resins, polypropylene resins, polyester resins, polyester resins, vinyl ester resins, vinyl ester ethylene copolymers, acrylic resins, styrene/acrylic copolymers, styrene/butadiene copolymers, synthetic or natural latexes, epoxies and polyurethanes.
3 more elements
Dependencies are inferred from the claim text.