Impact modified polystyrene seals for electrochemical cells

H - Electricity – 01 – M

Patent

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H01M 2/08 (2006.01)

Patent

CA 2356973

A sealing member for an electrochemical cell is formed of a high impact modified styrenic polymer blend which may include a styrenic polymer and an impact modifying agent which increases the toughness of the styrenic polymer. The styrenic polymer based sealing member has several advantages over conventional cell seals and sealing gaskets, including lower cost, better processability and improved chemical resistance to alkaline medium. Also provided are galvanic cells including the seal member, in particular miniature alkaline air cells including the seal member as a gasket.

Elément d'étanchéité conçu pour une pile électrochimique et constitué par un mélange de polystyrènes présentant une caractéristique de modification d'impact et pouvant comprendre un polystyrène et un agent de modification d'impact augmentant la résistance du polystyrène. Cet élément d'étanchéité à base de polystyrène présente plusieurs avantages par rapport aux éléments et aux joints d'étanchéité classiques, y compris un coût inférieur, une capacité de traitement améliorée et une résistance chimique accrue à un milieu alcalin. L'invention concerne également des piles galvaniques contenant cet élément d'étanchéité, en particulier des piles alcalines miniaturisées à alvéoles d'air comprenant cet élément d'étanchéité sous forme de joint.

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