C - Chemistry – Metallurgy – 08 – J
Patent
C - Chemistry, Metallurgy
08
J
C08J 5/12 (2006.01) B29C 55/02 (2006.01) B32B 27/32 (2006.01) C08F 10/00 (2006.01) C08F 10/02 (2006.01) C08J 5/18 (2006.01) C08L 23/04 (2006.01)
Patent
CA 2459448
Disclosed is a method for producing a laminated porous polyolefin film, the method comprising steps of: providing a pair of tools for thermocompression bonding two resin films therebetween, laminating two films each comprising at least one layer made of a polyolefin resin composition comprising 100 parts by weight of a polyolefin resin having a melt index of 0.1 g/10 min or less and 80 to 300 parts by weight of a filler to form a laminated film by piling and thermocompression bonding the films between the thermocompressing portions of the tools, wherein the surface temperature of each thermocompressing portion is adjusted to a temperature higher than the melting point of the polyolefin resin by from 5 to 25°C during the lamination, and drawing the laminated film to form micropores therein, thereby yielding a porous film.
Kuroda Ryuma
Takata Atsuhiro
Yamada Takeshi
Fetherstonhaugh & Co.
Sumitomo Chemical Company Limited
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