Title:
MAGNETIC FLUID FOR BLACK PIGMENT
Document Type and Number:
Japanese Patent JPH04335502
Kind Code:
A
Abstract:
PURPOSE: To provide a title substance consisting mainly of water-based magnetic fluid which does not undergo yellowing even when left for a long term under a high temperature condition such as 80°.
CONSTITUTION: A Prussian blue pigment or an ultramarine pigment is loosened in pure water where oleic sodium solution is added and stirred at 90-93°. After cooling the mixture is centrifugally separated, rinsed, and repetitively centrifugally separated for vacuum drying. It is added into a dioctylsulpho succinic sodium solution for pH adjustment. This mixture and a wet type magnetite water-based magnetic fluid are mixed, stirred, and then subjected to beads milling to provide a pigment-loaded water-based magnetic fluid.
Inventors:
KANAE NOBUHIKO
Application Number:
JP13567291A
Publication Date:
November 24, 1992
Filing Date:
May 10, 1991
Export Citation:
Assignee:
NOK CORP
International Classes:
H01F1/34; H01F1/44; (IPC1-7): H01F1/34
Attorney, Agent or Firm:
Toshio Yoshida