Production of polyethylene terephthalate film for magnetic recor

Details Production of polyethylene terephthalate film for magnetic recor Production of polyethylene terephthalate film for magnetic recor

1985-06-24

1986-05-06

Lowe, James

Plastic and nonmetallic article shaping or treating: processes

Forming continuous or indefinite length work

Shaping by extrusion

2642358, 2642896, 2642902, B29C 5514

Patent

active

045870713

ABSTRACT:
The present invention relates to a polyethylene terephthalate film having the sum of F-5 values in longitudinal and transverse directions of 3500 to 5000 kg/cm.sup.2, absolute heat shrinkages in longitudinal and transverse directions at 100.degree. C. of up to 2.5% and amorphous orientation factor of -1.5 to 0.5, a process for the production thereof and a magnetic recording medium containing the film as a base. The polyethylene terephthalate film useful as a magnetic recording medium having super high-tensile-strength in both longitudinal and transverse directions and a low heat shrinkage is provided, while it has been considered that such properties could not be obtained in polyethylene terephthalate film.

REFERENCES:
patent: 3901851 (1975-08-01), Kohno et al.
patent: 4226826 (1980-10-01), Motegi et al.
patent: 4234532 (1980-11-01), Motegi et al.
patent: 4370291 (1983-01-01), Kazama et al.

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