| 摘要 |
PROBLEM TO BE SOLVED: To obtain good electromagnetic transducing characteristics by incorporating two kinds of fatty acid esters expressed by specified formulae as lubricants into a magnetic layer and a nonmagnetic layer. SOLUTION: The magnetic layer of the magnetic recording medium is >=1.1μm thick in average, and the magnetic layer and a nonmagnetic layer contain two kinds of fatty acid esters expressed by formula I and formula II as lubricants. In the formulae, R1 is 11-15C alkyl group and R2 is 17-20C alkyl group. The amts. of the two fatty acid esters are determined to satisfy the formulae III, IV and V. In the formulae, W1A and W1B are the amts. of the fatty acid esters expressed by formula I and formula II, respectively, in the magnetic layer, and W2A and W2B are the amts. of the fatty acid esters expressed by formula I and formula II, respectively, in the nonmagnetic layer. By forming a structure comprising the magnetic layer and the nonmagnetic layer containing fatty acid esters as specified lubricants, the obtd. magnetic recording medium has excellent storage property and enables high density recording.
|
