Magnetic recording medium substrate comprising an aromatic imide

Details Magnetic recording medium substrate comprising an aromatic imide Magnetic recording medium substrate comprising an aromatic imide

1989-07-26

1993-04-06

Thibodeau, Paul J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

428329, 428330, 428331, 428402, 4284735, 428694, 428900, G11B 500

Patent

active

052002551

ABSTRACT:
An aromatic polyimide film useful as a face for a magnetic recording material having a back face-side half stratum thereof containing principal filler fine particles which provide a low friction back face-side surface having a centerline average surface roughness of 2 to 10 m .mu.m, and a front face-side half stratum thereof free from the principal filler particles and optionally containing additional filler fine particles having a size of 0.05 to 0.7 time that of the principal filler particles in a concentration of 0.1 to 0.8 time that of the principal filler particles, which additional filler particles provide a high smoothness front face-side surface having a centerline average surface roughness (Ra) of 0.1 to 0.8 time that of the back face-side surface, is produced from a first aromatic polyamic acid solution containing the principal filler particles and a second aromatic polyamic acid solution free from the principal filler particles and optionally containing the additional filler particles, by forming a film-shaped composite solution stream consisting of a first film-shaped solution stream united with a second film shaped solution stream, solidifying the film-shaped composite solution stream, and heat treating the solidified film to convert the polyamic acid to a corresponding polyimide.

REFERENCES:
patent: 4781965 (1988-11-01), Hashimoto et al.
patent: 4839217 (1989-06-01), Tabata et al.
patent: 4910068 (1990-03-01), Takagi et al.

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