Biaxially oriented polyester film for use in floppy disc

Details Biaxially oriented polyester film for use in floppy disc Biaxially oriented polyester film for use in floppy disc

1990-10-18

1992-02-11

Cashion, Jr., Merrell C.

Stock material or miscellaneous articles

Composite

Of polyester

2642358, 428220, 428910, B32B 2706, B32B 2700

Patent

active

050875264

ABSTRACT:
The present invention provide a biaxially oriented polyester film for use in a floppy disc, which has a coefficient of thermal expansion (.alpha..sub.T) in film plane of (1.0.+-.0.5).times.10.sup.-5 mm/mm/.degree.C. and a heat shrinkage of not higher than 0.09% after treatment the film for 72 hours under conditions of a temperature of 60.degree. C. and a humidity of 80% RH in any directions in film plane, and simultaneously satisfies the following equations (1) to (5):

REFERENCES:
patent: 4960636 (1990-10-01), Tomitaka et al.
patent: 4985537 (1991-01-01), Utsumi et al.

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