Hardboard treating composition and process for forming hardboard surfaces
AssigneeReichhold Chemicals, Inc.
InventorsSalvatore G. Sanfilippo, James T. White
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Abstract
An aqueous polymeric composition for use in treating surfaces of lignocellulose fiber laps during processing to produce lignocellulose hardboard sheets having improved physical characteristics.
Claims7
An improved hardboard sheet formed from compressed lignocellulose fiber having outer wet surfaces treated with a storage-stable aqueous polymeric compositon that is cured during fiber compaction by a forming press that maintains the sheets under heat and pressure, said aqueous composition being (A) a homogeneous three-component system containing, on a dry solids basis, a miscible mixture of from about 40 to about 60 percent by weight of a water-soluble melamine-formaldehyde copolymer, from about 15 to about 30 percent by weight of a styrene-acrylic copolymer emulsion, and from about 18 to about 30 percent by weight of a water-soluble methylated melamine formaldehyde copolymer;
- (B) from about 25 to about 32 percent by weight of a compound capable of adjusting the pH of the composition;
- and (C) from about 3 to about 7 percent by weight of a cross-linking acid catalyst, based upon the total weight of the solids, said composition having a dry resin solids range of from about 30 to 40 parts by weight.
Dependencies are inferred from the claim text.