G - Physics – 11 – B
Patent
G - Physics
11
B
G11B 5/62 (2006.01) C04B 35/524 (2006.01) G11B 5/73 (2006.01) G11B 5/84 (2006.01)
Patent
CA 2143509
Disclosed are 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 comprises 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. The 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.
Ishimatsu Takeshi
Saito Kazuo
Nisshinbo Industries Inc.
Smart & Biggar
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