Foaming system for rigid urethane and isocyanurate foams

Details Foaming system for rigid urethane and isocyanurate foams Foaming system for rigid urethane and isocyanurate foams

1991-03-08

1994-02-15

Kight, III, John

Synthetic resins or natural rubbers -- part of the class 520 ser

Synthetic resins

Cellular products or processes of preparing a cellular...

521 99, 521155, 521161, 521902, C08G 1806

Patent

active

052867595

ABSTRACT:
Polyisocyanate-based foams having a uniformly fine cell size are prepared by reacting a polyisocyanate with an isocyanate-reactive compound in the presence of a blowing agent mixture comprising a hydrocarbon component which has four or more carbon atoms and a polyfluorocarbon component which has a boiling point of from about 283 K. to about 393 K. at 760 mm Hg and wherein the boiling point:molecular weight ratio of said polyfluorocarbon component is less than or equal to 1.7. The hydrocarbon component is present in from about 5 to about 95 mole percent and the polyfluorocarbon in from about 95 to about 5 mole percent based on total amounts of hydrocarbon and polyfluorocarbon.

REFERENCES:
patent: 4972002 (1990-11-01), Volkert
patent: 4981879 (1991-01-01), Snider
patent: 5034424 (1991-07-01), Wenning
patent: 5035833 (1991-07-01), Ogawa et al.

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