J.m. Huber Corporation

Robert D Palardy

Nian-hua Ou

Jianhua Pu

Steve Husted

Tim Smith

Scott H Radcliffe

Dragan R Kornicer

Thomas L Lee

A process for forming a polyurea coating on a wood composite substrate comprises the steps of applying an isocyanate to an edge of the wood substrate to form a pretreated edge and applying a polymer latex to the pretreated edge to form the polyurea coating. This polyurea coating provides excellent protection against the penetration of water through the edges and into the interior of the wood composite material and wood composite materials having this polyurea coating have significantly less edge swelling and adsorb considerably less water than wood composites that have no such protective coatings.

Method for forming edge sealant for wood

The present invention relates to the manufacture of a multi-layered board having a stable, and moisture-resistant surface. To accomplish this and other advantages of the invention, an improved binder system is used in the production of the surface layers of a multi-layered board which combines an. excellent resin penetration inside the wood constituents of the board's surface layers, with a strength, durability and resistance to ambient water and moisture. The improved binder system used in the production of the board surface layers according to this invention involves contacting wood pieces with a binder composition comprised of a curable powdery aldehyde resin and a curable isocyanate resin in the substantial absence of free water to provide a composite mixture that can be formed into a surface layer for assembly and lamination together with other wood and resin composite layers.

Manufacture of multi-layered board with a unique resin system

An apparatus for distributing a soap based release agent upon a surface comprising; a means for metering a controlled quantity of a liquid metallic soap into a pressurized water stream to form a pressurized aqueous solution having a controlled dilution ratio of soap to water, at least one manifold connected to receive the pressurized aqueous solution, and a plurality of nozzles mounted upon the manifold to uniformly distribute the pressurized liquid solution upon at least one surface. The surface may further be defined as a planar surface, moving unidirectional along a fixed path at a predetermined variable speed and defined by a surface area of length multiplied by width. The planar surface has a fixed width, wherein the surface area moving past a fixed point for a predetermined period of time is a function of the speed of the planar surface moving past the fixed point. At least one regulating means regulates the dilution ratio of the soap to water by controlling the quantity of the metallic soap metered into the pressurized water stream. This quantity of metallic soap is correlative with the speed of the planar surface, so as to maintain a relatively constant measure of metallic soap per unit of surface area as the speed of the planar surface is increased or decreased.

Apparatus for distributing a release agent for use in the manufacture of ligno-cellulosic composite materials

Oriented strand board is post-fabrication treated with a polymeric coating which includes isocyanate constituents to produce a construction material which is smooth, has high gloss, and which is resistant to water, vapor, and chemical penetration. The isocyanate constituents are most preferably MDI or PMDI, and may be present in a coating composition alone or in combination with other binder materials such as PEEG or other polyols. Prior to application of the coating composition, the surface of the oriented strand board is pretreated using heat and pressure to compress and densify wood at the surface, and to smooth out minor surface irregularities. The coating composition is then applied to the wood surface, and is cured to form a polymeric coating which bonds to the wood material. The polymeric coating is preferably a polyurethane and functions to prevent water, vapor, and chemical penetration into the oriented strand board, thereby permitting its use as a construction material in a wide variety of applications it heretofore has not achieved commercial acceptance. In addition, the polymeric coating provides the oriented strand board with a smooth surface.

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Athens, GA, United States of America

Robert D Palardy