Stable and breathable films of improved toughness and method...

Details Stable and breathable films of improved toughness and method... Stable and breathable films of improved toughness and method...

C - Chemistry, Metallurgy

08

J

C08J 5/18 (2006.01) A61L 15/18 (2006.01) A61L 15/24 (2006.01) B32B 27/32 (2006.01) C08K 3/26 (2006.01) C08L 23/08 (2006.01) C08L 23/20 (2006.01)

Patent

CA 2274231

The present invention relates to uniaxially oriented microporous breathable films of exceptional toughness transverse to the direction of orientation. Such films include a particulate filler and a nonelastic material including a copolymer of ethylene with at least one C4-C8 .alpha.-olefin monomer, such copolymers being described in the trade as "super tough", "next generation", etc., and being prepared with "new" or "improved" catalyst systems or with metallocene or similar single-site catalysts. A method of manufacture is also disclosed.

L'invention concerne des films respirants microporeux à orientation uniaxiale, ayant une ténacité exceptionnelle dans le sens transversal par rapport à la direction de l'orientation. Ces films comprennent un matériau de remplissage particulaire et un matériau non élastique. Ce dernier comprend un copolymère constitué d'éthylène et d'au moins un monomère d'.alpha.-oléfine C¿4?-C¿8?, tel que les copolymères désignés dans le commerce par les termes de "extra-dur", "nouvelle génération", etc., et il est préparé avec des systèmes catalyseurs "nouveaux" ou "améliorés" ou bien avec des catalyseurs à base de métallocènes ou des catalyseurs à site unique similaires. L'invention concerne également un procédé de fabrication.

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