The Celotex Corporation

Judy Ann Godbey

Michael E Londrigan

Gregory W Lynn

Jyothi S Pisipati

Closed cell, rigid polymer foams are prepared by (a) continuously conveying a carrier along a production line, (b) supplying on the carrier a foam-forming mixture comprising a polyisocyanate, a catalyst, a hydrogen-containing blowing agent or a mixture of the hydrogen-containing blowing agent and at least one co-blowing agent, and an isocyanate-reactive component comprising (i) a high acid polyester polyol having an acid number greater than 1, or (ii) a mixture of the high acid polyester polyol and at least one other isocyanate-reactive compound, (c) passing the carrier and mixture between two constricting members forming therebetween a metering gap, and (d) allowing the mixture after passing through the gap to freely expand to form a plastic foam, wherein the acid number and amount of the high acid polyester polyol in the mixture are sufficiently high to result in a superior resistance to cold temperature shrinkage.

Method for producing foams from high acid polyester polyols

A process for the manufacture of a closed cell, rigid, polymer foam from polymer foam-forming ingredients containing a filler which comprises: (a) dispersing the filler in at least a portion of the foam-forming ingredients to form a filled dispersion, a fluorochemical surfactant being incorporated in the foam-forming ingredients either before, during or after the dispersing operation to form a dispersion containing a filler and a fluorochemical surfactant, (b) mixing the dispersion formed in step (a) with any remaining foam-forming ingredient or ingredients, and (c) foaming and curing the resultant foam-forming composition. The fluorochemical surfactant improves the stability, flowability and mixing of the dispersion during the foam production.

Growing community of inventors

Tampa, FL, United States of America

Judy Ann Godbey