Patent ID: 6136408
Filing Date: 2000-10-24
Classification: B05D,B27N,B32B,Y10T

Abstract:
A method for improving the surface properties of a wood board, comprising the steps of:providing a wood board having a surface and an inner region, where said surface and said inner region are both comprised of wood material;pre-treating the wood board to produce a transitional region on the surface by heating and pressing the wood board effective to (i) increase the density of wood material at the surface relative to wood material at the inner region, (ii) initiate carmelization of short-chain carbohydrates in wood cell walls of said wood material at said surface, and (iii) burn off any extraneous fibers on said surface;cooling the pre-treated wood board;applying, after said pre-treating step, a polymer forming composition including isocyanate constituents to said transitional region on said surface of the pretreated wood board; andcuring said composition to form a polymeric coating on said wood board bonded to wood material in said wood board, to thereby form a construction material having increased moisture resistance and a smooth, hard surface.