Polyethylene terephthalate film, process for the production ther

Details Polyethylene terephthalate film, process for the production ther Polyethylene terephthalate film, process for the production ther

1984-09-26

1985-10-08

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Physical dimension specified

428334, 428335, 428336, 428480, 428910, 428694, 5283081, 5283082, 528502, B32B 436, G11B 568

Patent

active

045460302

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: 3967025 (1976-06-01), Tanabe
patent: 4226826 (1980-10-01), Motegi
patent: 4234532 (1980-11-01), Motegi
patent: 4316927 (1982-02-01), Kimura
patent: 4318957 (1982-03-01), Videc
patent: 4370291 (1983-01-01), Kazama

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