发明授权
- 专利标题: Magnetic recording medium and magnetic particles therefor
- 专利标题(中): 磁记录介质及其磁性颗粒
-
申请号: US641733申请日: 1984-08-17
-
公开(公告)号: US4693931A公开(公告)日: 1987-09-15
- 发明人: Haruo Andoh , Seiji Matsumoto
- 申请人: Haruo Andoh , Seiji Matsumoto
- 申请人地址: JPX Osaka JPX Osaka
- 专利权人: Hitachi Maxell, Ltd.,Sakai Chemical Industry Co., Ltd.
- 当前专利权人: Hitachi Maxell, Ltd.,Sakai Chemical Industry Co., Ltd.
- 当前专利权人地址: JPX Osaka JPX Osaka
- 优先权: JPX58-151116 19830818
- 主分类号: C01G49/06
- IPC分类号: C01G49/06 ; C09D5/23 ; C09D101/08 ; C09D127/04 ; C09D127/06 ; G11B5/706 ; G11B5/712 ; G11B5/714 ; G11B5/84 ; G11B5/842 ; H01F1/11 ; B32B5/16
摘要:
A magnetic recording medium comprising a nonmagnetic support and a magnetic layer provided thereon is disclosed. The magnetic layer comprises a magnetic recording element and a binder, wherein the magnetic recording element mainly comprises acicular gamma-Fe.sub.2 O.sub.3 particles having an average porosity of not more than 5% by volume, a specific surface area of 24 to 30 m.sup.2 /g and the X-ray diffraction intensity at the face (210) to that at the face (311) of not more than 5%. The magnetic recording medium has improved electromagnetic conversion characteristics such as sensitivity and noise.