Closed cell alkenyl aromatic foam

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 9/00 (2006.01) C08J 9/04 (2006.01) C08J 9/16 (2006.01) C08L 23/08 (2006.01) C08L 25/06 (2006.01)

Patent

CA 2353093

This invention pertains to a composition and a process for preparing a closed cell alkenyl aromatic polymer foam having enlarged cell size, comprising one or more alkenyl aromatic polymers, one or more substantially random interpolymers, one or more blowing agents having zero ozone depletion potential and optionally one or more co-blowing agents, and optionally, one or more nucleating agents and optionally, one or more other additives. This combination allows the manufacture of closed cell, low density alkenyl aromatic polymer foams of enlarged cell size, when blowing agents of relatively high nucleation potential are employed. When such blowing agents are used with alkenyl aromatic polymers in the absence of the substantially random interpolymers, small cell foams result.

Cette invention concerne une composition et un procédé de préparation d'une mousse polymère alcényle aromatique à alvéoles fermées ayant une taille d'alvéole grossie, comprenant un ou plusieurs polymères alcényle aromatiques, un ou plusieurs interpolymères sensiblement aléatoires, un ou plusieurs agents porogènes présentant un potentiel nul d'appauvrissement de la couche d'ozone et facultativement un ou plusieurs co-agents porogènes, et facultativement, un ou plusieurs agents de nucléation avec, de façon optionnelle, un ou plusieurs autres additifs. Cette combinaison permet la production de mousses alcényle aromatiques à alvéoles fermées, de faible densité, d'une taille d'alvéole grossie, lorsque l'on utilise des agents porogènes ayant un potentiel de nucléation relativement élevé. Lorsque l'on utilise ces agents porogènes avec des polymères alcényle aromatiques en l'absence des interpolymères sensiblement aléatoires, on obtient des mousses à petites alvéoles.

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