Magnetic recording flexible disc

Details Magnetic recording flexible disc Magnetic recording flexible disc

1984-04-06

1985-12-10

Robinson, Ellis P.

Stock material or miscellaneous articles

Composite

Of inorganic material

427128, 360135, 428900, 428910, 428480, G11B 562, G11B 582

Patent

active

045579822

ABSTRACT:
A magnetic recording flexible disc composed of a polyester film substrate having formed thereon a magnetic layer, the improvement wherein said polyester film is a biaxially oriented film consisting of poly-1,4-cyclohexylene dimethylene terephthalate wherein at least 90 mole % of a glycol component is 1,4-cyclohexanedimethanol and at least 80 mole % of an acid component is terephthalic acid, a maximum value of a temperature dependent expansion in the surface direction of the film is 9.times.10.sup.-6 to 35.times.10.sup.-6 /.degree.C., a maximum value of a humidity dependent expansion in the surface direction of the film is 0 to 8.0.times.10.sup.-6 /% RH, the difference between the maximum and minimum values of the temperature dependent expansion in the surface direction of the film is 0 to 8.0.times.10.sup.-6 /.degree.C., and the difference between the maximum and minimum values of the humidity dependent expansion in the surface direction of the film is 0 to 3.0.times.10.sup.-6 /% RH.

REFERENCES:
patent: 2884663 (1959-05-01), Alles
patent: 3284223 (1966-11-01), Watson
patent: 3501344 (1970-03-01), Watson
patent: 4316927 (1982-02-01), Kimura
patent: 4318957 (1982-03-01), Videc
patent: 4497865 (1985-02-01), Minami
patent: 4508782 (1985-04-01), Mira
"1,4-Cyclohexanedimethanol", Eastman Kodak, TDR No. X172, Jul. 1965.

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