A closed cell phenolic foam incorporating a hydrofluoroether

Details A closed cell phenolic foam incorporating a hydrofluoroether A closed cell phenolic foam incorporating a hydrofluoroether

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08K 5/06 (2006.01) C08L 61/06 (2006.01)

Patent

CA 2331411

A closed cell phenolic foam is formed from a phenolic resin, a blowing agent such as HCFC141b, a catalyst and less than 2.5 % by weight relative to the resin of at least one hydrofluoroether or an azeotrope formulation thereof. 1-methoxy-nonafluorobutane and especially an azeotrope formulation thereof with trans-1,2-dichloroethylene are preferred hydrofluoroethers. The phenolic foam has a stable closed cell content of greater than 90 % and a stable thermal conductivity.

L'invention concerne une mousse phénolique cellulaire formée à partir d'une résine phénolique, d'un agent d'expansion tel que HCFC141b, d'un catalyseur et de moins de 2,5 % en poids par rapport à la résine d'un hydrofluoroéther ou d'une formulation azéotrope de celui-ci au moins. Les hydrofluoroéthers préférés sont 1-méthoxy-nonafluorobutane et notamment une formulation azéotrope de ce produit avec trans-1,2-dichloroéthylène. Cette mousse phénolique présente une teneur stable en alvéoles fermées, supérieure à 90 %, ainsi qu'une conductivité thermique stable.

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