SUBSTRATE FOR MAGNETIC RECORDING MEDIUM AND PROCESS FOR PRODUCTION THEREOF

摘要

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.