Polyester films suitable for use in magnetic recording media

Details Polyester films suitable for use in magnetic recording media Polyester films suitable for use in magnetic recording media

1987-02-10

1987-11-24

Lesmes, George F.

Stock material or miscellaneous articles

Structurally defined web or sheet

Continuous and nonuniform or irregular surface on layer or...

428694, 428900, G11B 562

Patent

active

047089024

ABSTRACT:
A polyester film suitable for use as a substrate for magnetic recording media, characterized in that said polyester film is a biaxially oriented polyester film having an average refractive index n and a planar orientation .DELTA.P, which respectively satisfy the following equations [I] and [II]:

REFERENCES:
patent: 4153920 (1979-05-01), Shirahata et al.
patent: 4304807 (1981-12-01), Kanakami et al.
patent: 4316927 (1982-02-01), Kimura et al.
patent: 4338367 (1982-07-01), Kanakami et al.
patent: 4348446 (1982-09-01), Mitsuishi et al.
patent: 4439479 (1984-03-01), Kanai et al.
patent: 4497865 (1985-02-01), Minami et al.

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