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发明授权
US5489466A Magnetic recording medium comprising a lower nonmagnetic layer containing a surface coated inorganic powder and an upper magetic layer 失效
磁记录介质包括含有表面被覆无机粉末和上部磁性层的下部非磁性层

Magnetic recording medium comprising a lower nonmagnetic layer containing a surface coated inorganic powder and an upper magetic layer
摘要：
Disclosed is a magnetic recording medium comprising a nonmagnetic support, a lower nonmagnetic layer and an upper magnetic layer. The lower nonmagnetic layer is coated on the support, comprises an inorganic nonmagnetic powder dispersed in a binder, and is surface-coated with an inorganic oxide. The upper magnetic layer has a dry thickness of 1.0 micrometers or less and comprises a dispersion of a ferromagnetic powder in a binder. The upper magnetic layer is coated onto the lower nonmagnetic layer.
摘要（中）：

公开了包括非磁性载体，下部非磁性层和上部磁性层的磁记录介质。 下部非磁性层涂覆在载体上，包含分散在粘合剂中的无机非磁性粉末，并用无机氧化物进行表面涂覆。 上磁性层的干燥厚度为1.0微米或更小，并且包含铁磁性粉末在粘合剂中的分散体。 上磁性层被涂覆在下部非磁性层上。

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