| 摘要 |
PROBLEM TO BE SOLVED: To provide a release multilayered film which shows a good-looking crease finish of FPC and does not require the insertion of a cushioning material. SOLUTION: The release multilayered film has three layers, i.e., a release side layer, an intermediate layer and an opposite side layer to the release side and is characterized in that the resin of the release side layer is a polymethyl pentene or a copolymer of a polymethyl pentene and anα-olefin; the resin of the intermediate layer is anα-olefin copolymer or anα-olefin polygenetic polymer, a copolymer of ethylene and (meth)acrylic ester, a copolymer of ethylene, vinyl acetate and (meth)acrylic acid and a copolymer selected from partially ionized crosslinked products of the described copolymers or a mixture of the copolymers. In addition, in this film, the resin of the opposite side layer is a polypropylene; the resin of the intermediate 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 strength of 65 to 68 and a thickness of 10 to 100μm and a release strength between the release side layer and the intermediate layer of 0.1 g to 200 g/25 mm. COPYRIGHT: (C)2003,JPO
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