Patent ID: 7919148

Claim:
A process comprising: applying directly on a surface of a wood composite material selected from one of hardboard, medium density fiberboard, oriented strand board, particle board or plywood a formaldehyde-free, chemically crosslinkable primer coating composition, wherein the wood composite material comprises at least one of wood chips, flakes, fibers and particles in a resin binder composition, and wherein the crosslinkable primer coating composition comprises: 95 to 99% by weight, based on weight of dry materials in the composition, of an anionically stabilized aqueous emulsion of a copolymer with a T g of −10° C. to 50° C., the polymer comprising in polymerized form a polymerization mixture containing two or more ethylenically unsaturated monomers; 0.2 to 5% by weight of a polyimine compound having a number average molecular weight from 250 to 20,000; and 0.2 to 5% by weight of a volatile base; wherein the chemically crosslinkable composition forms a chemically crosslinked polymer matrix when, or as, the composition is being applied to the wood composite material; applying on the crosslinked polymer matrix a top coat composition comprising a thermoplastic or a thermosetting polymer latex composition to form a top coat layer; and compressing and heating the crosslinked polymer matrix, the top coat layer, and the wood composite material.