Polyester film for magnetic recording tape

Details Polyester film for magnetic recording tape Polyester film for magnetic recording tape

1987-10-06

1989-06-20

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428409, 428480, 523181, 528398, B32B 2736

Patent

active

048408301

ABSTRACT:
A polyester film suitable for use as the magnetic tape base for video recording, capable of high density recording and having stable slidability or running characteristics. The polyester film is made of a polyester which contains 0.05-1 wt % particles containing calcium and phosphorus and of which the number n of the second interference fringes (number/mm.sup.2) and the average centerline roughness (.mu.m) satisfy the following relationships:

REFERENCES:
patent: 4067855 (1978-01-01), Miwa et al.
patent: 4096109 (1978-06-01), Watanabe et al.
patent: 4138386 (1979-02-01), Motegi et al.
patent: 4304807 (1981-12-01), Kawakami et al.
patent: 4338367 (1982-07-01), Kawakami et al.
patent: 4348446 (1982-09-01), Mitsuishi et al.
patent: 4439479 (1984-03-01), Kanai et al.

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