Substrate for magnetic recording medium

Details Substrate for magnetic recording medium Substrate for magnetic recording medium

1997-01-31

1999-08-03

Lewis, Michael

Stock material or miscellaneous articles

Self-sustaining carbon mass or layer with impregnant or...

252 6251R, 423445R, 428692, 428694R, C01B 3100

Patent

active

059323493

ABSTRACT:
A substrate for magnetic recording medium, consisting essentially of a vitreous carbon produced from a polycarbodiimide resin; and a process for producing a substrate for magnetic recording medium, which comprise molding into an appropriate shape a polycarbodiimide resin or a composition mainly comprising a polycarbodiimide resin, carbonizing the shaped material, and processing the carbonized shaped material into a substrate for magnetic recording medium.
Said substrate for magnetic recording medium is free from the problems of the prior art, is lightweight and thin, has excellent mechanical strengths and a smooth and dense surface having substantially no pore, and can be produced at a low cost.

REFERENCES:
patent: 4737421 (1988-04-01), Uemura et al.
patent: 5152941 (1992-10-01), Takaku et al.
patent: 5180529 (1993-01-01), Takaku et al.

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