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发明公开
CN1755800A 磁记录介质用非磁性粉末及其制造方法以及使用该粉末的磁记录介质 失效 - 权利终止 转让

磁记录介质用非磁性粉末及其制造方法以及使用该粉末的磁记录介质
摘要：
用于层叠结构的涂布型磁记录介质的非磁性层的非磁性粉末，将该非磁性粉末分散在粘合剂中制做非磁性层用的涂料时，可获得有良好分散性的非磁性粉末，是采用汞压法算出的细孔半径0.0018－0.1μm的范围中在0.01－0.05μm的范围有细孔容积的最大值(细孔最集中的大小)，细孔径0.0018－0.01μm范围的细孔容积的累计相对于细孔径测量范围0.0018－0.1μm的细孔容积的累积值在30％以下的铁的化合物为主要成分的粒子组成的磁记录介质用非磁性粉末。
摘要（英）：

A nonmagnetic powder, used for the nonmagnetic layer of a coated type magnetic recording medium having a multilayer structure, has good dispersibility in the binder in which it is dispersed to prepare a coating material that is applied to the nonmagnetic layer. The nonmagnetic powder has an iron compound as its principal component and exhibits a maximum pore volume value in a pore diameter range of 0.01 µm to 0.05 µm within a pore diameter range of 0.0018 µm to 0.1 µm in which the relationship between pore diameter and pore volume is calculated by a mercury injection method. The nonmagnetic powder exhibits a cumulative pore volume value in a pore diameter range of 0.0018 µm to 0.01 µm that is not more than 30% of the cumulative pore volume value in the pore diameter range of 0.0018 µm to 0.1 µm.

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