发明授权
US5633050A Method for producing a magnetic recording medium including wet
orientation without agglomeration of magnetic particles
失效
用于制造磁性记录介质的方法,该记录介质包括湿定向而不会磁性颗粒的聚集
- 专利标题: Method for producing a magnetic recording medium including wet orientation without agglomeration of magnetic particles
- 专利标题(中): 用于制造磁性记录介质的方法,该记录介质包括湿定向而不会磁性颗粒的聚集
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申请号: US500556申请日: 1995-07-11
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公开(公告)号: US5633050A公开(公告)日: 1997-05-27
- 发明人: Norio Shibata , Shinsuke Takahashi
- 申请人: Norio Shibata , Shinsuke Takahashi
- 申请人地址: JPX Kanagawa
- 专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人: Fuji Photo Film Co., Ltd.
- 当前专利权人地址: JPX Kanagawa
- 优先权: JPX5-122133 19930427
- 主分类号: G11B5/70
- IPC分类号: G11B5/70 ; G11B5/738 ; G11B5/845 ; G11B5/852 ; H01F1/00
摘要:
A method for producing a magnetic recording medium which results in the effective oblique orientation of magnetic fine particles without aggregation of the particles. The method results in a magnetic recording medium having an upper magnetic layer containing needle-shaped, granular, or plate-like magnetic particles, and at least one lower nonmagnetic layer formed on a nonmagnetic support so that the magnetic particles have the maximum degree of orientation in an oblique or perpendicular direction with respect to a surface of the support. The oblique or perpendicular orientation is performed in the wet state of a magnetic layer and in the condition in which the amount of the solvent residue in the upper magnetic layer is 40 to 80% after the upper magnetic layer and the lower nonmagnetic layer are applied sequentially or simultaneously to form a multilayer. The upper magnetic layer is formed so as to be thinner than the lower nonmagnetic layer and subjected to horizontal orientation with a plane of the surface of the support.
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