| 摘要 |
PURPOSE:To obtain a magnetic recording medium which is excellent in both of electromagnetic conversion characteristic and durability by having a magnetic layer formed by dispersing and binding magnetic powder having a specific length or below of average long axis diameter in the cured and coated film of a specific radiation curing resin. CONSTITUTION:The radiation curing resin to be used has a polar group in the molecule and has at least two polymerizable carbon-carbon double bonds. Satisfactory crosslinking hardenability is not obtainable if said bonds are <2. Particularly the resin having <=8,000, more preferably <=5,000 average mol. wt. is required to be selectively used. The magnetic powder having <=0.5mum, and usually 0.05-0.5mum average long axis diameter is used as the magnetic powder to be dispersed and bound into the binder. The easy dealing with the tendency toward the higher density recording is made possible by using such finely pulverous magnetic powder.
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