Method of making pressed fiber board

Claim 1

IN THE MANUFACTURE OF PRESSED WOOD, THE STEP CONSISTING ESSENTIALLY OF APPLYING A RESINOUS IMPREGNATING COMPOSITION SELECTED FROM TH GROUP CONSISTING OF (A) AN EMULSION OF POLYVINYL ACETATE CONTAINING A RELEASE AGENT, (B) AN EMULSION OF A COPOLYMER OF 70 PARTS BY WEIGHT OF STYRENE, 25 PARTS BY WEIGHT OF ACRYLONITRILE, AND 5 PARTS BY WEIGHT OF METHACRYLIC ACID IN ADMIXTURE WITH THE HEXAMETHYL ETHER OF HEXAMETHYLOL MELAMINE IN THE APPROXIMATE RATIO OF 4 PARTS BY WEIGHT OF SAID COPOLYMER TO 3 PARTS BY WEIGHT OF SAID MELAMINE COMPOUND AND CONTAINING A RELEASE AGENT, (C) A MIXTURE OF APPROXIMATELY 2 PARTS BY WEIGHT OF POLYVINYL ACETATE IN EMULSION FORM 1 PART BY WEIGHT OF THE HEXAMETHYL ETHER OF HEXAMETHYLOL MELAMINE, 3 PARTS BY WEIGHT OF PIGMENT, AND A RELEASE AGENT; THE RELEASE AGENT IN (A), (B), AND (C) BEING SELECTED FROM THE GROUP CONSISTING OF MONOOCTYL ACID PHOSPHATE, ISOAML ISOOCTYL ACID PHOSPHATE, AND OCTYL DECYL ACID PHOSPHATE, AND BEING PRESENT IN THE AMOUNT OF ABOUT 0.5 TO 3 PERCENT BY WEIGHT BASED ON THE WEIGHT OF SOLIDS TO THE SURFACE OF A WEB OF WET WOOD FIBERS, THE APPLICATION BEING MADE AFTER THE SURPLUS WATER HAS BEEN SQUEEZED FROM THE WEB AND BEFORE THE WEB HAS BEEN SUBJECTED TO PRESSURE AT ELEVATED TEMPERATURES.