Highly oriented film by cold drawing and its production

  • Inventors:
  • Assignees: Asahi Chem Ind Co Ltd
  • Publication Date: December 07, 1979
  • Publication Number: JP-S54155270-A

Abstract

PURPOSE: To obtain the title film having improved mechanical strength, low-temperature shrink characteristics, and shrinkage stress, by irradiating a composition consisting of an ethylene-vinyl acetate copolymer, a thermoplastic elastomer, and a polyamide, with high energy rays. CONSTITUTION: 100 parts by wt. of a composition consisting of A) 95W10 wt.% of an ethylene-vinyl acetate copolymer having 3W30 wt. % vinyl acetate group and a melt index and 0.2W10 and B) 5W95 wt. % of a thermoplastic elastomer made of an α-olefin copolymer having 60W95 mole % of ethylene and melt index of 0.1W 10 are blended with C) 5W400 parts by wt. of a polyamido to give a molten blend. The blend is extruded from a T-die, quenched by a liquid refrigerant, and set to make a raw film, which is irradiated with high energy rays so that it has boiling xylene insoluble gel content not more than 70 wt. %. The film is then heated up to not more than 100°C and oriented at a normal temperatureW100°C at an area draw ratio of 5W30:1 and at a cross direction draw ratio of 2W7:1 by blown-film extrusion. COPYRIGHT: (C)1979,JPO&Japio

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    EP-0323742-A2July 12, 1989Tonen Chemical CorporationPolmer-Zusammensetzung, daraus angefertigte wärmebeständige Gegenstände mit Formgedächtnis und Verfahren zu deren Herstellung