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AssigneeToray Industries, Inc.
InventorsKenji Kida, Shinichiro Miyaji, Yukichi Deguchi
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A laminated polyphenylene sulfide film having excellent adhesiveness, especially heatsealability, and good mechanical properties and heat resistance, as well as a process for producing the same are disclosed. A central layer is constituted by a biaxially oriented polyphenylene sulfide film and a surface layer is constituted by phenylene sulfide copolymer containing a copolymerization unit other than p-phenylene sulfide unit in an amount of not less than 3 mol % and less than 50 mol %, so that the film has an improved adhesiveness and heatsealability while retaining the heat resistance and mechanical properties of biaxially oriented polyphenylene sulfide films.
A laminated polyphenylene sulfide film comprising a central layer consisting essentially of a biaxially oriented poly-p-phenylene sulfide film, and a surface layer consisting essentially of a phenylene sulfide copolymer film in which at least one copolymerization unit other than p-phenylene sulfide unit is copolymerized with p-phenylene sulfide unit, which is laminated on at least one surface of the central layer, the resin compositions constituting said layers satisfying the following equations (1)-(4):
A process of producing a laminated polyphenylene sulfide film comprising the steps of laminating on at least one surface of a poly-p-phenylene sulfide composition a phenylene sulfide copolymer in which at least one copolymerization unit other than p-phenylene sulfide unit is copolymerized with p-phenylene sulfide unit by co-extrusion to obtain a laminated sheet;
Dependencies are inferred from the claim text.