Aromatic polyimide film

Details Aromatic polyimide film Aromatic polyimide film

1987-05-15

1989-06-13

Herbert, Thomas J.

Stock material or miscellaneous articles

Structurally defined web or sheet

Including variation in thickness

428208, 428323, 428331, 428458, 4284735, 428900, B32B 310, B32B 516, B32B 2700

Patent

active

048392170

ABSTRACT:
An aromatic polyimide film containing very fine particles of an inert inorganic material having an average particle diameter of 40 to 1,000 angstroms in an amount of 0.02 to 6.0 wt. %, wherein a surface of the film is provided with extremely small sized protrusions having a maximum height of 50 to 500 angstroms and an average diameter of 50 to 2,000 angstroms, the number of protrusions is in the range of 2.times.10.sup.5 to 1.times.10.sup.8 /mm.sup.2, and the number of protrusions having a diameter of not less than 1.5 times as much as the average diameter is not more than 5% of the total number of the protrusions. This polyimide film is suitably employable as a support of a magnetic recording medium.

REFERENCES:
patent: 4612235 (1986-09-01), Ushimaru et al.
patent: 4624892 (1986-11-01), Ishizaki et al.
patent: 4671993 (1987-06-01), Kadokura et al.

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