Forming polyolefin-filler film with rugged pattern and...

Details Forming polyolefin-filler film with rugged pattern and... Forming polyolefin-filler film with rugged pattern and...

B - Operations, Transporting

29

C

18/33

B29C 55/02 (2006.01) B29C 59/04 (2006.01) C08J 5/18 (2006.01) C08K 3/00 (2006.01)

Patent

CA 1318092

ABSTRACT A gas-permeable porous film which is prepared by stretching a film made from a mixture containing a polyolefin resin and an inorganic filler at least uniaxially and possesses a rugged pattern on its surface. One process for producing the film comprises forming the aforesaid mixture into a film, providing on the surface of the film a rugged pattern, stretching the resulting film at least uniaxially, and forming on the stretched film thus-formed a rugged pattern by means of a heated emboss roll and simul- taneously allowing the stretched film to contract.

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