Process for producing polymeric films from crystallizable polyes

Details Process for producing polymeric films from crystallizable polyes Process for producing polymeric films from crystallizable polyes

1976-10-19

1978-08-29

Thurlow, Jeffery R.

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

264216, 264235, 264289, 264346, B29D 724

Patent

active

041103955

ABSTRACT:
A process for producing polymeric films from crystallizable polyesters, such as polyethylene terephthalate, comprising extruding a molten polymer onto a receiving surface with subsequent cooling of the polymer on said surface at 20.degree.-80.degree. C. to obtain an amorphous polymeric film. This film is heat-treated at 130.degree.-190.degree. C. to obtain a crystallinity of the film of 5-50%. Then the film is oriented at 130.degree.-250.degree. C., thermally fixed at 170.degree.-250.degree. C. and cooled at 20.degree.-30.degree. C. Polymeric films produced by the above-described method have a high structural homogeneity and elevated physical and mechanical characteristics (ultimate tensile strength up to 4000 kg/cm.sup.2, yield point up to 3500 kg/cm.sup.2).

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patent: 3900604 (1975-08-01), Tanabe et al.

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