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

C - Chemistry, Metallurgy

08

J

C08J 9/06 (2006.01) C08J 9/14 (2006.01)

Patent

CA 2016328

This invention relates to a process for preparing a rigid, closed-celled polyisocyanate-based foam in the presence of water and a blowing agent. The blowing agent comprises one or more organic compounds, particularly halocarbons, having a boiling point of from 222K to 272K at atmospheric pressure, and is substantially free of organic compounds having a boiling point of 273K or greater. Preferred halocarbons are chlorofluoroethanes, especially chlorodifluoroethane (R-142b) and fluoroethanes.

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