Porous film and its production process

C - Chemistry – Metallurgy – 08 – J

Patent

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Details

C08J 5/18 (2006.01) A61F 13/15 (2006.01) C08L 23/02 (2006.01) C08L 23/06 (2006.01) C08L 23/08 (2006.01) C08L 83/04 (2006.01) C08L 91/00 (2006.01)

Patent

CA 2446683

It is to provide a porous film which is excellent in gas permeability (air permeability) and moisture permeability (water vapor permeability), and is excellent in anti-leakage properties and anti-bleeding properties against a liquid, hiding properties and masking properties at an adhesion portion, and a process for producing it. A porous film obtained by melting and kneading a resin composition containing a polyolefin resin {component (A)} and a bulking agent {component (B)} as the main components, and a silicone {component (C)}, or a silicone {component (C)} and castor oil {component (D)}, followed by drawing, which shrinks by from 40 to 95% in one direction and expands by from 5 to 40% in a direction transverse thereto, when soaked in a silicone oil of 200 C for 60 seconds, and a process for producing the above porous film, are provided.

L'invention concerne un film poreux excellent au niveau de la perméabilité gazeuse (perméabilité à l'air) et de la perméabilité à l'humidité (perméabilité à la vapeur d'eau). Il présente d'excellentes propriétés anti-fuite et anti-saignement par rapport à un liquide, ainsi que d'excellentes propriétés de camouflage et de masquage au niveau d'une partie d'adhésion. Elle concerne également son procédé de production. On réalise un film poreux en faisant fondre et en malaxant une composition de résine contenant une résine polyoléfine {composant (A)} et un agent gonflant {composant (B)} en tant que composants principaux, ainsi que silicone {composant (C)}, ou silicone {composant (C)} et une huile de ricin {composant (D)}, suivi d'étirage, ce qui le rétrécit de 40 à 95% dans une direction et le dilate de 5 à 40% dans la direction transversale à celle-ci, lorsqu'il est trempé dans une huile de silicone à 200·C pendant 60 secondes. L'invention concerne enfin un procédé permettant de fabriquer ledit film poreux.

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