Blowing agent composition and polymeric foam containing a...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/12 (2006.01) C08J 9/00 (2006.01) C08J 9/14 (2006.01) C09K 5/04 (2006.01)

Patent

CA 2432144

The present invention relates to blowing agent compositions for polymeric foams that contain carbon dioxide and a hydrofluorocarbon having a boiling point of 14~C or higher and lower than 120~C. The present invention also relates to processes for preparing polymeric foam using such blowing agent compositions, foamable polymer compositions containing such blowing agents, and polymeric foams containing such blowing agent compositions. Suitable blowing agent combinations include: (a) a composition containing carbon dioxide and at least one hydrofluorocarbon having a boiling point of 30~C to 120~C that is essentially free of other low boiling ethers and hydrocarbons; (b) a composition containing greater than 50 weight-percent carbon dioxide and at least one hydrofluorocarbon having a boiling point of 14~C or higher to 120~C; and (c) carbon dioxide and one hydrofluorocarbon having a boiling point of 14~C or higher and lower than 120~C.

La présente invention concerne des compositions d'agents d'expansion pour des mousses polymères contenant du dioxyde de carbone et un hydrofluorocarbure présentant un point d'ébullition égal ou supérieur à 14 ·C et inférieur à 120 ·C. La présente invention concerne également des procédés permettant de préparer une mousse polymère à l'aide de ces compositions d'agents d'expansion; des compositions polymères expansibles contenant de tels agents d'expansion; et des mousses polymères contenant de telles compositions d'agents d'expansion. Les combinaison d'agents d'expansion pouvant convenir, comprennent: (a) une composition contenant du dioxyde de carbone et au moins un hydrofluorocarbure présentant un point d'ébullition compris entre 30 ·C et 120 ·C, cette composition étant pratiquement exempte d'autres hydrocarbures et éthers présentant un point d'ébullition bas; (b) une composition contenant plus de 50 % en poids de dioxyde de carbone et au moins un hydrofluorocarbure présentant un point d'ébullition égal ou supérieur à 14 ·C et pouvant atteindre 120 ·C; et (c) du dioxyde de carbone et un hydrofluorocarbure présentant un point d'ébullition égal ou supérieur à 14 ·C et inférieur à 120·C.

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