Magnetic recording medium

Details Magnetic recording medium Magnetic recording medium

1985-12-27

1987-06-16

Robinson, Ellis P.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including components having same physical characteristic in...

427128, 427131, 427132, 428336, 4284735, 428694, 428900, 428611, 428928, G11B 5704

Patent

active

046736123

ABSTRACT:
A magnetic recording medium, comprising an aromatic polyimide film and a magnetic layer of a ferromagnetic material provided on the aromatic polyimide film. The aromatic polyimide film is prepared by imidation of a film formed from a solution of a polyamic acid solution obtained by copolymerization of an aromatic amine component comprising at least 30 mole % of p-phenylene diamine and 0 to 70 mole % of diaminodiphenylether, respectively based on the total amount of the aromatic amine component, and a tetracarboxylic acid dianhydride.

REFERENCES:
patent: 4470944 (1984-09-01), Asakura
patent: 4539264 (1985-09-01), Yazawa
patent: 4548864 (1985-10-01), Nakayama
patent: 4565234 (1986-01-01), Arai
patent: 4579778 (1986-04-01), Yamaguchi
patent: 4588636 (1986-05-01), Shirahata
patent: 4592942 (1986-06-01), Nishimatsu

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