| 摘要 |
PROBLEM TO BE SOLVED: To provide a release film which shows a good-looking crease finish of FPC not ever realized in the conventional release film, while maintaining outstanding characteristics such as releasability, shape follow-up properties, platability and uniform moldability. SOLUTION: This release film has a release side layer and an opposite side layer to the release side, and is characterized in that the resin of the release side layer is a polymethylpentene or a copolymer of a polymethylpentene and anα-olefin, and the resin of the opposite side layer is anα-olefin copolymer or a polygenetic copolymer selected from ethylene, butene, pentene, hexene and methylpentene, a copolymer of ethylene and acrylic ester or methacrylic ester, a copolymer of ethylene and vinyl acetate, acrylic acid or methacrylic acid and a copolymer selected from partially ionized crosslinked products of the described copolymers or a mixture of the copolymers. In addition, in the release film, the resin of the opposite side layer has a melt flow rate of 0.3 to 10.0 g/10 min and a melting point of 50 to 150°C and the resin of the release side layer has a Rockwell hardness of 65 to 88 and a thickness of 10 to 100μm and a release strength between the release side layer and the opposite side layer of 0.1 g to 200 g/25 mm. COPYRIGHT: (C)2003,JPO
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