Magnetic fluid

Compositions – Magnetic – Chromium or chromium compound containing

Patent

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Details

Other Related Categories

252 6252, 428402, 428611, H04B 3500, C09D 523, H01F 100

Type

Patent

Status

active

Patent number

045199310

Description

ABSTRACT:
This invention provides a magnetic fluid which is diversified in hue and stable in the electric fields.
The magnetic fluid of this invention is composed of a dispersion of ferromagnetic particles dispersed by a surfactant, and a colorant having the same charge as the dispersing medium in said dispersing medium.
The dyes effective for use in this invention are the nonionic azo dyes, anthrquinone dyes and metal-containing dyes, and the pigments useful in this invention are the organic or inorganic pigments treated so as to have an isoelectric point in the dispersing medium. A magnetic fluid having black color or other desired hues can be obtained by properly selecting the dye and/or pigment.
The magnetic fluid of this invention exhibits its excellent properties particularly when used as a recording material.

REFERENCES:
patent: 4020236 (1977-04-01), Aonuma et al.
patent: 4116906 (1978-09-01), Ishino et al.
patent: 4125667 (1978-11-01), Jones
patent: 4145300 (1979-03-01), Hendriks
patent: 4285801 (1981-08-01), Chiang
patent: 4296176 (1981-10-01), Lennon et al.

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