Magnetic recording medium
AssigneeFuji Photo Film Co., Ltd.
InventorMikio Ohno
Life of this patent
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Abstract
A magnetic recording medium is provided which includes a non-magnetic support and a magnetic layer formed on or above the support. The magnetic layer includes a ferromagnetic powder, a binder resin, an abrasive, and a fatty acid ester. The fatty acid ester is a fatty acid alkyl ester compound having an acid hydrolysis rate of 0.030 (1/hr) or less. The abrasive present on the surface of the magnetic layer satisfies the relational expression 0.01≦H15/H10≦0.20 where H10 denotes the number of particles per unit area having a height less than 10 nm (particles/μm2) and H15 denotes the number of particles per unit area having a height equal to or greater than 15 nm (particles/μm2).
Claims15
A magnetic recording medium comprising:
- a non-magnetic support;
- and
- a magnetic layer formed on or above the support, said magnetic layer comprising a ferromagnetic powder, a binder resin, an abrasive, and a fatty acid ester;
- the fatty acid ester being a fatty acid alkyl ester compound having an acid hydrolysis rate of 0.030 (1/hr) or less;
- and
- the abrasive present on the surface of the magnetic layer satisfying the relational expression:
- 0.01≦H15/H10≦0.20
- where H10 denotes the number of particles per unit area having a height less than 10 nm (particles/μm2) and H15 denotes the number of particles per unit area having a height equal to or greater than 15 nm (particles/μm2).
Dependencies are inferred from the claim text.