C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 9/00 (2006.01) C08L 23/10 (2006.01)
Patent
CA 2563787
A microporous polypropylene film exhibiting enhanced film forming properties in .beta.-crystal technique; a microporous polypropylene film of markedly lowered specific gravity; a microporous polypropylene film of highly enhanced permeability; and a process for producing these microporous polypropylene films. There is provided a microporous polypropylene film comprising a polypropylene whose Trouton's ratio is specified. Further, there is provided a microporous polypropylene film comprising a polypropylene whose main chain skeleton contains long-chain branching. Still further, there is provided a microporous polypropylene film comprising a polypropylene whose formula of relationship between melt tension and melt flow rate is specified. Still further, there is provided a microporous polypropylene film comprising a polypropylene whose profile of film in-plane intensity distribution in azimuthal angle direction of (-113) face as identified by X-ray diffractometry is specified.
Un film de polypropylène microporeux présentant de meilleures propriétés de formation de film en technique .beta.-cristalline ; un film de polypropylène microporeux de densité apparente nettement diminuée ; un film de polypropylène microporeux à perméabilité fortement améliorée ; et un processus pour produire ces films de polypropylène microporeux. Il est proposé un film de polypropylène microporeux comprenant un polypropylène dont le rapport de Trouton est spécifié. Il est de plus proposé un film de polypropylène microporeux comprenant un polypropylène dont le squelette de la chaîne principale contient de longues ramifications. Par ailleurs, il est proposé un film de polypropylène microporeux comprenant un polypropylène dont la formule de relation entre la tension de matière fondue et le débit de matière fondue est spécifiée. Il est aussi proposé un film de polypropylène microporeux comprenant un polypropylène dont le profil de répartition de l~intensité en longitude du film dans la direction d'angle azimutale du côté (-113) comme identifié par diffractométrie aux rayons X est spécifié.
Fukushima Hajime
Masuda Jun'ichi
Morita Reiko
Ohkura Masatoshi
Tanaka Shigeru
Smart & Biggar
Toray Industries Inc.
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