公开(公告)号：US5294492A

公开(公告)日：1994-03-15

申请号：US722472

申请日：1991-07-02

申请人： Hiroshi Oka ,  Kazuaki Kouziro ,  Toshitada Shigemura ,  Tomohisa Moriya ,  Katsumi Yamashita ,  Kazushi Takama ,  Takanobu Uemoto ,  Kazuhiro Fujita

发明人： Hiroshi Oka ,  Kazuaki Kouziro ,  Toshitada Shigemura ,  Tomohisa Moriya ,  Katsumi Yamashita ,  Kazushi Takama ,  Takanobu Uemoto ,  Kazuhiro Fujita

IPC分类号： C01G49/00 ,  C09D5/23 ,  C09D7/12 ,  G11B5/706 ,  G11B5/712 ,  H01F1/11 ,  B32B15/02

CPC分类号： G11B5/70673 ,  G11B5/712 ,  Y10T428/2991

摘要： Disclosed herein is a process for producing acicular magnetic iron oxide particles comprising the steps of: mixing an aqueous dispersion of acicular magnetic iron oxide particles with an aqueous solution of a Co salt and an alkaline aqueous solution, or an aqueous solution of a Co salt, an aqueous solution of an Fe(II) salt and and an alkaline aqueous solution; and heat-treating the alkaline suspension solution obtained at 50.degree. to 100.degree. C.; wherein an Sr salt, a Ba salt or an Sr salt and a Ba salt is added to one selected from the group consisting of said aqueous dispersion of acicular magnetic iron oxide particles, said aqueous solution of a Co salt, said aqueous solution of an Fe(II) salt, said alkaline aqueous solution and said alkaline suspension solution before heat-treatment, and at least one selected from the group consisting of Si compound, Al compound, Zn compound and Mg compound is added to one selected from the group consisting of said aqueous dispersion of acicular magnetic iron oxide particles, said aqueous solution of a Co salt, said aqueous solution of an Fe(II) salt, said alkaline aqueous solution, said alkaline suspension solution before heat-treatment and said alkaline suspension solution during heat-treatment.

摘要翻译： 本发明公开了一种制备针状磁性氧化铁颗粒的方法，包括以下步骤：将针状磁性氧化铁颗粒的水性分散体与Co盐和碱性水溶液的水溶液或Co盐的水溶液混合， Fe（II）盐和碱性水溶液的水溶液; 对在50〜100℃下得到的碱性悬浮液进行热处理。 其中将Sr盐，Ba盐或Sr盐和Ba盐加入到选自由针状磁性氧化铁颗粒的所述水分散体，所述Co盐水溶液，Fe （II）盐，所述碱性水溶液和所述碱性悬浮液在热处理前，将选自Si化合物，Al化合物，Zn化合物和Mg化合物中的至少一种添加到选自以下的一种中： 所述针状磁性氧化铁颗粒的水分散体，所述Co盐水溶液，所述Fe（II）盐水溶液，所述碱性水溶液，热处理前的所述碱性悬浮液和所述碱性悬浮液在热处理过程中， 治疗。