The manufacture of non-cfc cellular resol foams using...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/14 (2006.01) C08G 65/00 (2006.01) C08J 9/00 (2006.01) C08L 71/02 (2006.01)

Patent

CA 2267313

The invention relates to a process for producing non-CFC resol foams of low density using perfluorinated ethers along with an HCFC or CFC blowing agent, and to foams produced by such a process. The process generally comprises: (a) forming a mixture by combining a resol resin with a blowing-agent blend comprising (i) at least one blowing agent selected from the group consisting of hydrogenated chlorofluorocarbons and hydrogenated fluorocarbons and (ii) at least one perfluoroether additive selected from the group consisting of perfluorinated ethers; (b) adding an acid catalyst to the mixture to initiate foaming and form a foam; and (c) curing the foam to form a cured foam that is essentially free of CFCs.

Cette invention se rapporte à un produit servant à fabriquer des mousses résols sans CFC de faible densité, en utilisant des éthers perfluorés ainsi qu'un agent gonflant à base de HCFC ou de CFC, ainsi qu'à des mousses fabriquées à l'aide de ce procédé. Ce procédé consiste d'une façon générale: (a) à former un mélange en combinant une résine résol avec un mélange d'agents gonflants comprenant (i) au moins un agent gonflant choisi dans le groupe constitué par les chlorofluorocarbures hydrogénés (HCFC) et par les fluorocarbures hydrogénés et (ii) au moins un additif au perfluoroéther choisi dans le groupe constitué par des éthers perfluorés; (b) à ajouter un catalyseur acide à ce mélange pour amorcer le gonflement et former une mousse; et (c) à faire durcir la mousse pour obtenir une mousse durcie qui soit essentiellement exempte de CFC.

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