Compositions: coating or plastic – Coating or plastic compositions – Metal-depositing composition or substrate-sensitizing...
Patent
1981-12-15
1988-07-19
Yarbrough, Amelia Burgess
Compositions: coating or plastic
Coating or plastic compositions
Metal-depositing composition or substrate-sensitizing...
106 22, 106 23, 252 6255, 252 6256, C09D 1102
Patent
active
047582758
ABSTRACT:
This invention provides a magnetic fluid having a rich hue and containing an organic compound as dispersion medium.
The magnetic fluid of this invention is constructed by mixing, into a magnetic dispersion, a colorant prepared by beforehand treating a coloring material with a solubilizing treating agent or a dispersibilizing treating agent. Said solubilizing treating agent or dispersibilizing treating agent has a hydrophobic group and a functional group absorbable or linkable to said coloring material. As said coloring material, a dyestuff, an organic pigment or an inorganic pigment is used. A colorant prepared by subjecting an intermediate of said coloring material to said treatment is also usable. Further, a colorant prepared by pretreating a coloring material so as to give the coloring material an absorbability or a linkability to said solubilizing treating agent or dispersibilizing treating agent and then subjecting the beforehand pretreated coloring material to said treatment is also usable.
The magnetic fluid of this invention can retain its initial hue stably for a long period of time, and its hue can be changed without substantially changing the properties of magnetic fluid such as magnetization, viscosity and the like. Accordingly, the magnetic fluid of this invention can be applied extensively to all the use fields of magnetic dispersion, and it exhibits a particularly great effect when applied to uses of developer or ink in the field of printing and recording.
REFERENCES:
patent: 4145300 (1979-03-01), Hendriks
patent: 4218530 (1980-08-01), Lu
patent: 4256818 (1981-03-01), Blossey et al.
patent: 4259368 (1981-03-01), Rudolf et al.
Shimotsuma Wataru
Soga Mamoru
Sonoda Nobuo
Yubakami Keiichi
Burgess Yarbrough Amelia
Matsushita Electric - Industrial Co., Ltd.
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