Oriented thermoplastic elastomer film and process for...

C - Chemistry – Metallurgy – 08 – L

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C08L 77/00 (2006.01) C08J 5/18 (2006.01) C08L 23/28 (2006.01)

Patent

CA 2516066

An oriented thermoplastic elastomer film having reduced permeability and improved fatigue resistance comprising a dynamically vulcanized polymer blend of (A) a halogenated isobutylene elastomer and (B) polyamide, the film is produced by casting or blowing the above polymer blend under the condition such that a shear rate at a die lip for casting or blowing is regulated to control the molecular arrangement in the film, whereby the planar birefringemence (PBR) of the resultant film becomes greater or equal to 0.002 and a production process of the same.

L'invention concerne un film élastomère thermoplastique orienté présentant une perméabilité réduite et une meilleure résistance à la fatigue qui comprend un mélange polymère obtenu par vulcanisation dynamique (A) d'un élastomère à base d'isobutylène halogéné et (B) de polyamide. Le film est produit par coulée ou soufflage du mélange polymère susmentionné pour autant qu'un taux de cisaillement au niveau d'une lèvre de matrice de la coulée ou du soufflage soit régulé de manière à maîtriser la disposition moléculaire dans le film, la biréfringence planaire (PBR) du film résultant excédant ou égalant alors 0,002. L'invention concerne enfin le procédé de production du film en question.

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