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AssigneeJfe Steel Corporation
InventorsYasuhide Yoshida, Hiroki Iwasa, Hiroshi Kubo, Takeshi Suzuki, Akihiko Furuta, Keiji Sugawara, Masaaki Yamashita
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[Problem] The object is to provide a resin film for metal sheet laminate which endures severe forming owing to excellent formability and impact resistance, and also to excellent adhesion after forming and heating, further gives stable performance independent of forming conditions, and also provides a laminated metal sheet, and a method for manufacturing the same. [Means for Resolution] The resin film for metal sheet laminate has a mixed resin in which a granular resin mainly existing in a state of grains having 0.1 to 5 μm in diameter is dispersed in a polyester resin having a main basic skeleton of polyethylene terephthalate and/or isophthalic acid copolymerized polyethylene terephthalate, in a range from 3 to 30% by weight in entire resin. The granular resin is a modified polyolefin resin containing a functional group derived from carboxylic acid in a range from 2 to 20% by weight as carboxylic acid.
A non-stretched resin film which consists essentially of a thermoplastic polyester resin containing 3 to 30 percent by weight in a weight fraction in the entire resin of a granular resin with a grain diameter of 0.1 to 5 μm, said granular resin being a modified polyolefin resin containing 2 to 20 percent by weight of a functional group derived from carboxylic acid in terms of carboxylic acid.
A method for manufacturing resin film comprising inserting a thermoplastic polyester resin containing 3 to 30 percent by weight in a weight fraction in the entire resin of a granular resin with a grain diameter of 0.1 to 5 μm, said granular resin being a modified polyolefin resin containing 2 to 20 percent by weight of a functional group derived from carboxylic acid in terms of carboxylic acid in an extruding machine as a raw material resin to melt the resin and form a molten resin, inserting a layer R2 comprising a modified polyolefin resin having a functional group derived from carboxylic acid in an extruding machine to melt the modified polyolefin resin to form a molten modified polyolefin resin, and forming a film comprising a two-layer construction by extruding the molten resin and the molten modified polyolefin resin from one T die.
A method for manufacturing a resin film comprising inserting a thermoplastic polyester resin containing 3 to 30 percent by weight in a weight fraction in the entire resin of a granular resin with a grain diameter of 0.1 to 5 μm, said granular resin being a modified polyolefin resin containing 2 to 20 percent by weight of a functional group derived from carboxylic acid in terms of carboxylic acid in an extruding machine as a raw material resin to melt the resin and form a molten resin, inserting a polyester resin constituting a resin layer R0 containing polyethylene terephthalate and/or isophthalic acid copolymerized polyethylene terephthalate as a basic skeleton in an extruding machine to melt the polyester resin and from a molten polyester resin, inserting a resin layer R2 comprising a modified polyolefin resin having a functional group derived from carboxylic acid in an extruding machine to melt the modified polyolefin resin to form a molten polyolefin resin, and forming a film comprising a three-layer construction by extruding the molten resin, the molten polyester resin and the molten modified polyolefin resin from one T die.
Dependencies are inferred from the claim text.