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    • 4. 发明授权
    • Coating type magnetic recording medium
    • 涂层式磁记录介质
    • US6114026A
    • 2000-09-05
    • US57609
    • 1998-04-09
    • Masahiro SawaguchiKazuhiko SuzukiYuko Abe
    • Masahiro SawaguchiKazuhiko SuzukiYuko Abe
    • C10M105/38C09D5/23C09D175/06C10M107/50C10N40/18G11B5/702G11B5/71
    • G11B5/7022G11B5/71Y10S428/90Y10T428/25
    • An object of the present invention is to impart good running stability and durability to a magnetic recording medium comprising a combination of a polyester polyurethane resin and a phenox resin as a binder for a magnetic layer of a coating type magnetic recording medium while ensuring excellent static magnetic properties.In order to achieve the object, the present invention provides a coating type magnetic recording medium having a magnetic layer formed on a nonmagnetic support and containing a magnetic powder, a binder and a lubricant, wherein a combination of a polyester polyurethane resin and a phenox resin is use as the binder, a combination of a polyhydric alcohol ester and silicone oil is used as the lubricant, and the surface extraction of the lubricant from the coating type magnetic recording medium is 3.0.times.10.sup.-3 to 3.0.times.10.sup.-2 g/m.sup.2.
    • 本发明的目的是赋予包含聚酯聚氨酯树脂和苯氧树脂组合的磁记录介质作为涂层型磁记录介质的磁性层的粘合剂的良好的运行稳定性和耐久性,同时确保优异的静磁 属性。 为了实现该目的,本发明提供了一种涂覆型磁记录介质,其具有形成在非磁性载体上并含有磁性粉末,粘合剂和润滑剂的磁性层,其中聚酯聚氨酯树脂和苯氧树脂 作为粘合剂,使用多元醇酯和硅油的组合作为润滑剂,并且从涂布型磁记录介质中润滑剂的表面萃取为3.0×10 -3〜3.0×10 -2 g / m 2。