Oriented thermoplastic vulcanizate

Details Oriented thermoplastic vulcanizate Oriented thermoplastic vulcanizate

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) B60C 1/00 (2006.01) C08L 23/28 (2006.01) C08L 77/00 (2006.01)

Patent

CA 2419247

Oriented films are prepared. A thermoplastic vulcanizate, prepared by mixing at least 20 wt.% of a thermoset rubber by weight of the total composition into a thermoplastic polymer are disclosed. After the mixture is prepared the thermoset rubber is entrained as discrete particles within the continuous thermoplastic polymer phase. The resulting composite is subjected to a stress either by pulling, blow molding, or any other film-forming process as is known in the art. This stress causes the continuous phase polymer molecules to become aligned or oriented in the direction in which the stress was applied, thus creating the oriented thermoplastic vulcanizate of the invention. This material has improved gas permeability and improved flexibility properties.

Cette invention concerne la fabrication de films orientés, plus précisément d'un vulcanisat thermoplastique obtenu en mélangeant dans un polymère thermoplastique un caoutchouc thermodurci à raison d'au moins 20 % en poids de la composition totale. Une fois réalisé le mélange, le caoutchouc thermodurci est entraîné sous formes de particules séparées dans la phase continu du polymère thermoplastique. Le matériau composite ainsi obtenu est soumis à un effort par traction, moulage par soufflage ou tout autre procédé de formation de film connu. Cet effort a pour effet d'aligner ou d'orienter les molécules de polymère en phase continue dans le sens d'application dudit effort. On obtient ainsi le vulcanisat thermoplastique selon l'invention. Ce matériau se caractérise par une perméabilité améliorée aux gaz et par des caractéristiques de souplesse accrues.

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