Surface treatment for wood materials including oriented strand b

Details Surface treatment for wood materials including oriented strand b Surface treatment for wood materials including oriented strand b

1997-11-25

2000-10-24

Thibodeau, Paul

Stock material or miscellaneous articles

Structurally defined web or sheet

Including grain, strips, or filamentary elements in...

428109, 428170, 428218, 4282924, 4282974, 4284251, 4285371, 427317, 427325, 264446, 264 294, B32B 512, B32B 2104, B05D 302, H05B 600

Patent

active

061364088

ABSTRACT:
Oriented strand board is post-fabrication treated with a polymeric coating which includes isocyanate constituents to produce a construction material which is smooth, has high gloss, and which is resistant to water, vapor, and chemical penetration. The isocyanate constituents are most preferably MDI or PMDI, and may be present in a coating composition alone or in combination with other binder materials such as PEEG or other polyols. Prior to application of the coating composition, the surface of the oriented strand board is pretreated using heat and pressure to compress and densify wood at the surface, and to smooth out minor surface irregularities. The coating composition is then applied to the wood surface, and is cured to form a polymeric coating which bonds to the wood material. The polymeric coating is preferably a polyurethane and functions to prevent water, vapor, and chemical penetration into the oriented strand board, thereby permitting its use as a construction material in a wide variety of applications it heretofore has not achieved commercial acceptance. In addition, the polymeric coating provides the oriented strand board with a smooth surface.

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KJ. Charrier; Polymeric Materials and Processing, Plastics, Elastomers and Composities; 3.3 Thermosetting Resins (Thermosets); pp. 181-192.

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