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AssigneeFuji Photo Film Co., Ltd.
InventorsKatsumi Ryoke, Yutaka Kakuishi, Toshiyuki Kitahara, Akihiro Matsufuji
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A magnetic recording medium is described comprising a nonmagnetic support having formed thereon a magnetic layer containing a ferromagnetic powder, an abrasive, and a binder, wherein the ferromagnetic powder is a metal magnetic powder having a crystallite size of not larger than 200 .ANG., the abrasive comprises (i) an inorganic powder having a Mohs' hardness of more than 9 and a mean particle size of 0.1 to 0.9 .mu.m which is contained in an amount of from 0.1 to 10 parts by weight per 100 parts by weight of the ferromagnetic powder, and a center-line average surface roughness (Ra) of the magnetic layer is less than 5 nm. The magnetic recording medium exhibits improved properties in C/N, running durability and drop-out. A process of producing the recording medium is also disclosed involving a calender treatment with at least one pair of metal rolls.
A magnetic recording medium comprising a nonmagnetic support having formed thereon a magnetic layer containing a ferromagnetic powder, an abrasive, and a binder, wherein the ferromagnetic powder is a metal magnetic powder having a crystallite size of not larger than 200 .ANG., and the abrasive comprises (i) an inorganic powder having a Mohs' hardness of 10 and a mean particle size of 0.1 to 0.9 .mu.m which is contained in an amount of from 0.1 to 10 parts by weight per 100 parts by weight of the ferromagnetic powder, and (ii) an inorganic powder having a Mohs' hardness of from 8 to 9;
A process for producing a magnetic recording medium, which comprises:
A magnetic recording system comprised of a high hardness magnetic head composed of a nitride, and a magnetic recording medium comprised of a nonmagnetic support having formed thereon a magnetic layer containing a ferromagnetic powder, an abrasive, and a binder;
Dependencies are inferred from the claim text.