A foaming system for rigid urethane and isocyanurate foams

Details A foaming system for rigid urethane and isocyanurate foams A 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 2016329

This invention relates to rigid closed-celled polyisocyanate-based foams exhibiting improved dimensional stability and a process for their preparation. In particular, it relates to resulting foams containing within their cells, a gas mixture comprising from 15 to 70 mole percent carbon dioxide and from 30 to 85 mole percent of a halocarbon mixture. The halocarbon mixture itself, comprises (a) from 40 to 95 mole percent based on moles of (a) and (b) present of a halocarbon compound having a boiling point of at least 283°K, and (b) from 50 to 60 mole percent of a halocarbon compound having a boiling point equal to or less than 266°K. Preferred halocarbons for component (a) and (b) are ethane halocarbons especially fluorodichloroethane or dichlorotrifluoroethane and chlorodifluoroethane, respectively.

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