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Molecular Biology

Toner-for-developing-electrostatic-image

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***WITHDRAWN PATENT AS PER THE LATEST USPTO WITHDRAWN LIST*** *** NO IMAGES AVAILABLE***

Description:...

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Toner for developing electrostatic image

Details

Inventors: Okado, Kenji; Fujita, Ryoichi; Takiguchi, Tsuyoshi;
Assignee: Canon Kabushiki Kaisha (Tokyo, JP)
Primary Examiner: RoDee; Christopher D.
Assistant Examiner:
Attorney, Agent or Firm: Fitzpatrick, Cella, Harper & Scinto

The toner for developing an electrostatic image, excellent in any environmental conditions, comprises the colorant-containing resin particles and at least one kind of fine titanium oxide powder which has been made hydrophobic by treating in an aqueous medium; the fine titanium oxide powder has an average particle diameter of from 0.001 .mu.m to 0.2 .mu.m and a hydrophobicity of from 20% to 80%.

DETAILED DESCRIPTION An object of the present invention is to provide a toner for developing an electrostatic image, that has solved the problems as discussed above.
Another object of the present invention is to provide a toner for developing an electrostatic image, that does not tend to be influenced by environments such as temperature and humidity and always has a stable triboelectric chargeability.
Still another object of the present invention is to provide a toner for developing an electrostatic image, that can form a fog-free, sharp image and has a superior running stability.
The above objects of the present invention can be achieved by a toner for developing an electrostatic image, comprising colorant-containing resin particles and at least one fine inorganic powder which has been made hydrophobic by treating in an aqueous medium; said fine organic powder having an average particle diameter of from 0.
001 .
mu.
m to 0.
2 .
mu.
m and a hydrophobicity of from 20% to 80%.

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