Closed cell polymer foam

Details Closed cell polymer foam Closed cell polymer foam

C - Chemistry, Metallurgy

08

J

C08J 9/14 (2006.01) C08J 9/00 (2006.01) C08J 9/12 (2006.01) C08J 9/36 (2006.01)

Patent

CA 2278202

A closed-cell polymer foam having a density of less than 100 kg.m-3 is described. The cells in the foam contain a foam blowing agent comprising (a) a blend of two or more hydrofluorocarbons, (b) a blend comprising a carbon dioxide and one or more hydrofluorocarbons or (c) a blend comprising dimethyl ether and one or more hydrofluorocarbons, and the polymer is a blend comprising at least 50 % by weight of an olefinic polymer(s) and up to 50 % by weight of a polar polymer(s) having a lower molecular weight than the olefinic polymer which when in the heat plasticised state is able to dissolve the foam blowing agent. A process for preparing the foam is also described.

On décrit une mousse de polymère à alvéoles fermées qui a une densité inférieure à 100 kg/m<-3>. Les cellules dans la mousse contiennent un agent de gonflement de la mousse qui comprend a) un mélange de deux ou plusieurs hydrofluorocarbones; b) un mélange contenant du dioxyde de carbone et un ou plusieurs hydrofluorocarbones; ou c) un mélange contenant un diméthyléther et un ou plusieurs hydrofluorocarbones. Le polymère est un mélange composé d'au moins 50 % en poids d'un (ou de) polymère(s) oléfinique(s), et d'au plus 50 % en poids d'un (ou de) polymère(s) polaire(s) qui a une masse moléculaire inférieure à celle du polymère oléfinique et qui, sous sa forme thermoplastifiée, peut dissoudre l'agent de gonflement de la mousse. On décrit également un procédé de préparation de ladite mousse.

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