Surface treatment for wood materials including oriented strand board
US6136408A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 25, 1997 |
| Grant date | Oct 24, 2000 |
| Priority date | — |
| Expiry date | Nov 25, 2017 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31989
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.