发明授权
- 专利标题： Non-magnetic black particles, non-magnetic black pigment therefrom and non-magnetic black filler therefrom
- 专利标题（中）： 非磁性黑色颗粒，非磁性黑色颜料及其非磁性黑色填料
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申请号： US477707申请日： 2000-01-05
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公开(公告)号： US6117540A公开(公告)日： 2000-09-12
- 发明人: Yasuyuki Tanaka , Hiroko Morii , Kazuyuki Hayashi , Hiroshi Sumita
- 申请人： Yasuyuki Tanaka , Hiroko Morii , Kazuyuki Hayashi , Hiroshi Sumita
- 申请人地址： JPX Hiroshima-ken
- 专利权人： Toda Kogyo Corporation
- 当前专利权人： Toda Kogyo Corporation
- 当前专利权人地址： JPX Hiroshima-ken
- 优先权： JPX8-237135 19960819; JPX9-98339 19970331
- 主分类号： C08K3/30
- IPC分类号： C08K3/30 ; C09C1/00 ; C09C1/24 ; C09D7/12 ; G11B5/708
摘要：
In accordance with the present invention, there are provided non-magnetic black particles composed primarily of Fe and having a hematite structure, which shows an excellent blackness, heat resistance, and dispersibility in a vehicle, and which particles contain manganese in an amount of 5 to 40% by weight based on the weight of the non-magnetic black particles, a soluble sodium salt in an amount of not more than 500 ppm (calculated as Na), and a soluble sulfate in an amount of not more than 200 ppm (calculated as SO.sub.4), and have an average particle size of 0.1 to 10.0 .mu.m and a pH of not less than 5.
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