Process for the production of hardboard
AssigneeNational Starch and Chemical Investment Holding Corporation
InventorsDennis R. De Wacker, Leon Rosenberg
Life of this patent
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Abstract
A one-step process for simultaneously compressing and tempering fiberboard panel, which includes the step of applying to the panel prior to compression thereof an aqueous treating composition which comprises a polyvinyl acetate emulsion and optionally up to 40% of a hydrocarbon emulsion, up to 3% of a fluid, water-soluble organosilicone polymer, or up to 5% by weight of a starch crosslinking agent. The polyvinyl acetate emulsion is prepared in the presence of 6-10% by weight of a starch stabilizer selected from the group consisting of derivatized starches and/or converted starches and 0.5-1.5% of a surfactant. The preferred emulsions are polymerized in the presence of alkenyl succinate starches, most preferably octenyl succinate waxy maize starches.
Claims16
A one step process for simultaneously compressing and tempering a fiberboard panel, which comprises the step of applying to the panel prior to compression thereof an aqueous treating composition which consists essentially of (a) a polyvinyl acetate emulsion, characterized in that the emulsion is prepared in the presence of about 6-10% by weight of a starch stabilizer selected from the group consisting of a derivatized starch, a converted starch, and a derivatized and converted starch and 0.5-1.5% of a surfactant, the stabilizer and surfactant percentages being by weight based on the total weight of the monomers, (b) up to 40% of a hydrocarbon emulsion, and (c) up to 5% of a crosslinking agent, the percentage of (b) and (c) being by weight of the treating composition and totaling 100%.
Dependencies are inferred from the claim text.