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Laminated-polyolefin-films-and-methods-of-production-thereof-by-coextrusion

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Laminated polyolefin films and methods of production thereof by coextrusion

Details

Inventors: Itaya, Yukiyasu; Hiei, Michiya; Kamei, Toshiya;
Assignee: Takemoto Yushi Kabushiki Kaisha (Aichi, JP)
Primary Examiner: Nakarani; D. S.
Assistant Examiner:
Attorney, Agent or Firm: Beyer Weaver & Thomas LLP

A laminated polyolefin film with two or more layers is produced by coextrusion. An outer-layer forming material is prepared by with olefin resin containing specified kinds of non-ionic surfactant and salt of organic sulfonic acid in a specified amount and at a specified ratio. In the production of the laminated polyolefin film by coextrusion, this outer-layer forming material is used to form either one or both of the outer layers if the laminated film is to have three or more layers and to form only one of the outer layers if the laminated film is to have only two layers.

DETAILED DESCRIPTION It is therefore an object of the present invention to provide a method of not only producing a laminated polyolefin film by coextrusion but also providing it with superior and durable antistatic and antifogging properties without adversely affecting its natural transparency.
The invention is based on the discovery by the present inventors as a result of their diligent research in view of the above object that a proper method is to add, when a laminated polyolefin film is being produced by coextrusion, a non-ionic surfactant and a salt of organic sulfonic acid of specified kinds at a specified ratio to an olefin resin which will form the outer layer of this laminated polyolefin film such that they together will have a specified concentration.

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