Polyester film for magnetic recording media

Details Polyester film for magnetic recording media Polyester film for magnetic recording media

1986-10-03

1987-07-14

McCamish, Marion C.

Stock material or miscellaneous articles

Structurally defined web or sheet

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

428147, 428330, 428338, 428409, 428480, 428694, 428900, G11B 570

Patent

active

046802177

ABSTRACT:
A polyester film for magnetic recording media having excellent flatness, slipperiness and adhesiveness of the magnetic layer thereto, said film having minute protrusions on the surface thereof including roughness units each of which consists of a minute protrusion and a recess therearound having a longer diameter of at least 3 .mu.m, wherein the number of the roughness units per square mm, A, (number/mm.sup.2), satisfies the relation (1):

REFERENCES:
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.
patent: 4461797 (1984-07-01), Adachi et al.
patent: 4550049 (1985-10-01), Ono et al.

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