Closed cell phenolic foams

Details Closed cell phenolic foams Closed cell phenolic foams

C - Chemistry, Metallurgy

08

J

403/54

C08J 9/06 (2006.01) C08J 3/09 (2006.01) C08J 9/00 (2006.01) C08J 9/14 (2006.01)

Patent

CA 1238149

ABSTRACT An improved process is disclosed for the preparation of a cured substantially closed cell phenolic resin foam by preparing a mixture of a foamable phenol-aldehyde resin, a blowing agent, and an acid catalyst, allowing the mixture to foam, and curing the phenolic foam, wherein the improvement comprises: (a) maintaining the water content of the foamable mixture below about 14% by weight, (b) using a resin-soluble acid catalyst, (c) adding at least a minimum amount of two parts per hundred resin of surfactant to the mixture prior to foaming, and (d) adding a member of the lactone family to the mixture prior to foaming.

466623

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