Process for producing porous films

Details Process for producing porous films Process for producing porous films

B - Operations, Transporting

29

C

18/1041, 2/98.09

B29C 67/20 (2006.01) A61L 15/24 (2006.01) C08J 5/18 (2006.01) C08K 3/30 (2006.01)

Patent

CA 1245026

ABSTRACT A process for producing porous films which comprises blending 100 parts by weight of a polyolefin resin with 50 to 500 parts by weight of barium sulfate preferably having an average particle diameter of 0.1 to 7 µm, melting the resulting resin composition and forming it into a film, and then stretching the film at least uniaxially by a factor of 1.5 to 7. As the polyolefin resin, there may preferably be used a polyethylene resin having a melt index of 0.5 to 7 and a density of 0.915 to 0.935, and more preferably a linear low-density polyethylene resin having a melt index of 0.5 to 8.5 and a density of 0.915 to 0.935. As the linear low-density polyethylene resin, a copolymer of ethylene and hexene and/or octene is particularly preferred.

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