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Title:
MAGNETIC FLUID OF SILICONE OIL BASE AND ITS MANUFACTURE
Document Type and Number:
Japanese Patent JP3768564
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To obtain magnetic fluid excellent in dispersion, fluidity and endurance, by making the fluid contain silicone oil, carboxyl group containing anion based surface-active agent, and magnetic metal oxide particles and/or magnetic metal particles. SOLUTION: The title magnetic fluid of silicone oil base contains silicone oil, carboxyl group containing anion based surface-active agent, and magnetic metal oxide particles and/or magnetic metal particles. The magnetic fluid is manufactured as follows. Alkaline suspension is obtained by adding alkaline agent to suspension liquid dispersing magnetic metal oxide particles and/or magnetic metal particles; carboxyl group containing anion based surface active agent to the alkaline suspension; pH of the suspension obtained in the above is prepared to be at most 2; the obtained acid suspension liquid is dried; and the dried object and silicone oil are mixed. Thereby magnetic fluid of low vapor pressure which is applicable to a wide temperature range, non-toxic and safe can be obtained.

Inventors:
Toyohisa Fujita
Application Number:
JP16774695A
Publication Date:
April 19, 2006
Filing Date:
July 03, 1995
Export Citation:
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Assignee:
Toyohisa Fujita
Taiho Industry Co., Ltd.
International Classes:
C10M169/04; H01F1/44; C10M177/00; C10M107/50; C10M125/04; C10M125/10; C10M129/36; C10N10/02; C10N10/16; C10N30/00; C10N40/14; C10N70/00; (IPC1-7): H01F1/44; C10M169/04; //(C10M169/04; C10M107:50; C10M125:10); C10N10:16; C10N40:14
Domestic Patent References:
JP63175401A
JP5131020A
JP21424A
JP680977A
Attorney, Agent or Firm:
Naoki Fukumura