Closed cell, low density ethylenic polymer foam

Details Closed cell, low density ethylenic polymer foam Closed cell, low density ethylenic polymer foam

C - Chemistry, Metallurgy

08

J

C08J 9/12 (2006.01) C08F 10/02 (2006.01) C08J 9/30 (2006.01)

Patent

CA 2189552

An uncrosslinked, closed cell, low density ethylenic polymer foam having a fresh density of less than 150 kg/m3 is prepared from a foaming composition comprising an uncrosslinked low density ethylenic polymer selected from polyethylene, ethylene-vinyl acetate copolymers and ethylene-acrylic acid copolymers and having a melt index (according to ASTM D 1238) of less than 25 grams per ten minutes and a melt tension (measured at 190°C with a 2.16 kg weight and 60 rpm) between 2.0 grams and 9.0 grams, using inorganic halogen-free blowing agents, such as carbon dioxide, argon, or mixtures thereof. A process for preparing such uncrosslinked, closed cell, low density ethylenic polymer foam comprising extruding an ethylenic polymer of suitable melt tension using a 100 percent inorganic blowing agent, such as carbon dioxide, argon, or mixtures thereof, and the foams produced with this process are also disclosed.

Une mousse polymère, éthylénique, de faible densité, à alvéoles fermées, non réticulée, ayant une densité inférieure à 150 kg/m<3> est préparée à partir, par exemple, d'un polyéthylène de faible densité, non réticulé, au moyen d'agents gonflants inorganiques, tels que le dioxyde de carbone, l'argon ou des mélanges de ceux-ci. Un procédé de préparation de cette mousse polymère éthylénique, de faible densité, à alvéoles fermées, non réticulée, consiste à extruder un polymère éthylénique, ayant une pression de fusion appropriée, à l'aide d'un agent gonflant à 100 pour cent inorganique, tel que le dioxyde de carbone, l'argon ou des mélanges de ceux-ci, et les mousses obtenues à l'aide de ce procédé sont également décrites.

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