Weyerhaeuser Company Limited

Trus Joist Macmillan a Limited Partnership

Richard L Buxton

Erik M Parker

A mixture, casting system and method for forming a polyurethane product. The mixture typically includes a slurry including an alcohol containing at least two hydroxyl groups, and calcium carbonate. Typically, the calcium carbonate is present in the slurry in a range of between about 40% and 70% by weight. The mixture also includes an isocyanate mixed into the slurry such that isocyanate forms between about 10% and 50% by weight of the resulting mixture, the remainder of the resulting mixture being slurry. The mixture also may include a chain extender, cross-linking agent, or polymerization catalyst.

Polyurethane casting system and method

A flame-intumescent coating is provided for a wood-based building product, the coating being adapted to expand to form an expanded coating when exposed to heat from a fire. The coating comprises a polymeric binder, at least one blowing agent dispersed in the binder, and at least one intumescent compound dispersed in the binder. The blowing agent and intumescent compound are adapted to expand the coating when the coating is exposed to heat from a fire. The polymeric binder is formed from a mixture including castor oil and an isocyanate, wherein the castor oil is present in the mixture in a quantity of 9-36% of the total weight of the coating. A flame-retardant building product is also provided.

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Boise, ID, United States of America

Richard L Buxton