Polyester film for high density magnetic recording medium

Details Polyester film for high density magnetic recording medium Polyester film for high density magnetic recording medium

1989-06-02

1991-09-03

Herbert, Jr., Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428220, 428323, 428480, 428900, 428910, B32B 300, B32B 2700, B32B 2736

Patent

active

050453793

ABSTRACT:
A polyester film suitable for a base of high density magnetic recording medium containing barium ferrite as a magnetic material characterized in that the centerline average roughness (Ra) is not more than 0.025 .mu.m and the F.sub.5 value in the longitudinal direction is not less than 14 kg/mm.sup.2 is disclosed wherein the polyester film exhibit excellent better durability when used with barium ferrite as a magnetic material.

REFERENCES:
patent: 4489117 (1984-12-01), Ono et al.
patent: 4663209 (1987-05-01), Aonuma et al.
patent: 4670319 (1987-06-01), Katoh et al.
patent: 4687710 (1987-08-01), Ogawa et al.
patent: 4761327 (1988-08-01), Hamano et al.

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