Rigid polyurethane foam containing polyester residue...

Details Rigid polyurethane foam containing polyester residue... Rigid polyurethane foam containing polyester residue...

C - Chemistry, Metallurgy

08

G

403/40, 403/8, 2

C08G 18/66 (2006.01) C08G 18/42 (2006.01) E04B 1/94 (2006.01)

Patent

CA 1110399

ABSTRACT Rigid polyurethane foam is produced from polyisocyanate and polyol wherein 5-30% by weight of the polyol ingredient is a digestion product of polyalkylene terephthalate residues or scraps digested with organic polyols. The resulting rigid polyurethane foam exhibits uniform density and, when compared with a corresponding polyurethane foam which does not include the said digestion products, exhibits equivalent or superior physical strength properties. With fire re- tardant rigid polyurethane foams wherein the organic polyol ingredient includes halogenated organic polyols, use of 5- 30% by weight of the said digestion product in the organic polyol ingredient achieves a rigid fire retardant poly- urethane foam having a lower flame spread and a lower smoke generation than a corresponding polyurethane foam which does not include the said digestion product. When fabricated in a closed mold, the present rigid polyurethane foam has a more uniform density, i.e., a higher core density, than corresponding rigid polyurethane foams which do not include the said digestion product.

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