Extruded styrene resin foams, and methods for producing the...

C - Chemistry – Metallurgy – 08 – J

Patent

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C08J 9/14 (2006.01)

Patent

CA 2295070

Production of extruded styrene resin foams which are excellent in environmental compatibility and retain highly efficient thermal insulation property and have appropriate strength properties is disclosed which is characterized by using as a blowing agent a blowing agent comprising mainly 40 % by weight or more and 85 % by weight or less, based on the whole amount of the blowing agent, of at least one ether selected from the group consisting of dimethyl ether, methyl ethyl ether and diethyl ether, and 15 % by weight or more and 60 % by weight or less, based on the whole amount of the blowing agent, of at least one saturated hydrocarbon selected from the group consisting of saturated hydrocarbons having 3 to 5 carbon atoms. The production is further characterized by providing a more desirable cell structure such as a specified shape of cells or the presence of larger and smaller cells.

Cette invention se rapporte à un procédé servant à produire une mousse de résine styrénique extrudée qui est très respectueuse de l'environnement et qui possède des propriétés thermo-isolantes importantes et des propriétés de résistance appropriées. Ce procédé se caractérise par l'utilisation d'un agent moussant contenant, sur la base de la quantité totale de l'agent moussant, 40 à 85 % en poids d'au moins un éther choisi dans le groupe constitué par le diméthyléther, le méthyléthyléther et le diéthyléther et 15 à 60 % en poids d'au moins un hydrocarbure saturé choisi dans le groupe constitué par les hydrocarbures saturés C3-5, et la mousse ainsi produite se caractérise par une structure alvéolaire préférée, par exemple une structure ayant une forme d'alvéoles spécifique ou une structure dans laquelle coexistent des alvéoles de petite taille et de grande taille.

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