Cold impact resistant urethane foam

Details Cold impact resistant urethane foam Cold impact resistant urethane foam

C - Chemistry, Metallurgy

08

G

403/41, 18/660

C08G 18/50 (2006.01) A61L 9/04 (2006.01) A61L 15/26 (2006.01) A61L 15/42 (2006.01) A61L 17/10 (2006.01) A61L 27/18 (2006.01) C08G 18/10 (2006.01) C08G 18/12 (2006.01) C08G 18/48 (2006.01) C08G 18/76 (2006.01) C08G 18/80 (2006.01)

Patent

CA 1112400

ABSTRACT OF THE DISCLOSURE A quasi-prepolymer-type urethane foam for a reaction injection molding (RIM) system comprises, for the polyol side, a blend of a long-chain polyol with a short-chain diol and/or triol and an organometallic catalyst and, for the prepolymer side, a unique high--27 to 31%--PNCO quasi-prepolymer made by reacting an essentially pure MDI with a selected low molecular weight (240 to 1500) polyol having a functionality of about 2.7 to 3.3. The selected low molecular weight polyol is specifically a polyether polyol (i.e. a polyoxpropylene and/or ethylene polyol) initiated with TMP, hexanetriol, glycerine or other suitable polyol. The quasi-prepolymer, while having the expected high reactivity, surprisingly gives good rapid cures in less than two minutes. The resulting urethane foam is characterized by its excellent low temperature properties, especially -20°F cold flexibility and -20°F dart impact. The quasi-prepolymer storage stability can be greatly improved by the inclusion of a small amount of a liquid MDI.

298940

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