MAGNETIC RECORD MEDIUM

MAGNETIC RECORD MEDIUM

PROBLEM TO BE SOLVED: To provide a magnetic record medium having good electromagnetic conversion characteristics for high-density recording and excellent travelling stability and durability. SOLUTION: This magnetic record medium is produced by forming an intermediate layer containing at least a magn...

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Hauptverfasser: ISHIWATARI KENJI, NAKAYAMA HIDEHIKO
Format: Patent
Sprache:eng
Schlagworte:
INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
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creator ISHIWATARI KENJI
NAKAYAMA HIDEHIKO
description PROBLEM TO BE SOLVED: To provide a magnetic record medium having good electromagnetic conversion characteristics for high-density recording and excellent travelling stability and durability. SOLUTION: This magnetic record medium is produced by forming an intermediate layer containing at least a magnetic powder/or nonmagnetic powder and a binder and forming a magnetic layer as the outermost layer containing at least a ferromagnetic metal powder, binder and nonmagnetic inorg. powder in this order on a nonmagnetic supporting body. In such a case, the specific surface area of the ferromagnetic metal powder is >=50 m /g. The nonmagnetic inorg. powder contains alumina. The alumina is present as primary particles and particle groups of aggregation of plural particles after the coating film is formed. When the average particle size of the primary particle size is expressed by (d), the average particle size of the particle groups is 1.2 d to 10 d, and the abundance ratio of the primary particles to particle groups ranges 1:1 to 10:1.
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SOLUTION: This magnetic record medium is produced by forming an intermediate layer containing at least a magnetic powder/or nonmagnetic powder and a binder and forming a magnetic layer as the outermost layer containing at least a ferromagnetic metal powder, binder and nonmagnetic inorg. powder in this order on a nonmagnetic supporting body. In such a case, the specific surface area of the ferromagnetic metal powder is &gt;=50 m /g. The nonmagnetic inorg. powder contains alumina. The alumina is present as primary particles and particle groups of aggregation of plural particles after the coating film is formed. 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subjects INFORMATION STORAGE
INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORDCARRIER AND TRANSDUCER
PHYSICS
title MAGNETIC RECORD MEDIUM
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