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

1989-05-10

1990-11-20

Welsh, Maurice J.

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

Synthetic resins

Cellular products or processes of preparing a cellular...

25218215, 25218224, C08G 1814

Patent

active

049720031

ABSTRACT:
This invention relates to a process for preparing a rigid, closed-celled polyisocyanate-based foam in the presence of a blowing agent composition. The blowing agent composition comprises one or more organic compounds, particularly halocarbons, having a boiling point of less than or equal to 272K at atmospheric pressure, and further is substantially free of organic compounds having a boiling point of 273K or greater. Preferred halocarbons are chlorofluoroethanes and fluoroethanes.

REFERENCES:
patent: 3391093 (1968-07-01), Frost
patent: 4636529 (1987-01-01), Crooker

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