Transparent coating system for providing long term exterior durability to wood
AssigneePPG Industries, Inc.
InventorsJohn F. Grunewalder, Mark A. Harley, Alan J. Kaylo, Paul J. Prucnal
Life of this patent
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Abstract
Disclosed is a method for providing a wood substrate with durability against weathering comprising at least two steps (A) and (B). Step (A) consists of appying to the wood substrate a transparent treatment comprising an organosilicon-containing compound having at least one hydrolyzable silyl group in a carrier for said compound. Step (B) consists of thereafter coating the wood substrate with a transparent, film-forming, coating composition. The coating composition is characterized in that a transparent free film from the coating composition retains an elongation of at least 20 percent after at least 1,000 hours exposure in a Xenon Weatherometer.
Claims16
A method of providing a wood substrate with durability against weathering comprising:
- (A) applying to said wood substrate a transparent treatment comprising an organosilicon-containing compound having at least one hydrolyzable silyl group in a carrier for said compound;
- and thereafter
- (B) coating said wood substrate with a transparent, film-forming, coating composition containing components comprising an aliphatic polyisocyanate and an organic polyol whereby said components of said coating composition react to form a polyurethane film, characterized in that a transparent free film from said coating composition retains an elongation of at least 20 percent and a tensile strength of at least 2,000 pounds per square inch after at least 1,000 hours exposure in a Xenon Weatherometer.
A wood substrate having firmly adhered thereto a material comprising:
- (A) a dry layer of a transparent treatment comprising an organosilicon-containing compound having at least one hydrolyzable silyl group;
- and immediately above and firmly adhered to said dry layer
- (B) a transparent film from a film-forming, coating composition containing components comprising an aliphatic polyisocyanate and an organic polyol whereby said components of said coating composition react to form a polyurethane film, characterized in that a transparent free film from said coating composition retains an elongation of at least 20 percent and a tensile strength of at least 2,000 pounds per square inch after at least 1,000 hours exposure in a Xenon Weatherometer.
Dependencies are inferred from the claim text.