ELECTROSTATIC CHARGE IMAGE DEVELOPING TONER

PROBLEM TO BE SOLVED: To provide a black toner having sufficient coloring degree and blackness degree, free from contamination of a base or sticking on a developing sleeve, having excellent safety and low temperature developing property, and suitable to be used for a two-component developing method...

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Bibliographic Details
Main Authors NAGAYAMA MASASHI, SAWADA TOYOSHI, SHU HIYO, AOKI MITSUO, HASEGAWA HISAMI, SHIRAISHI KEIKO
Format Patent
LanguageEnglish
Published 07.04.2005
Edition7
Subjects
CINEMATOGRAPHY
ELECTROGRAPHY
ELECTROPHOTOGRAPHY
HOLOGRAPHY
MAGNETOGRAPHY
PHOTOGRAPHY
PHYSICS
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Summary:PROBLEM TO BE SOLVED: To provide a black toner having sufficient coloring degree and blackness degree, free from contamination of a base or sticking on a developing sleeve, having excellent safety and low temperature developing property, and suitable to be used for a two-component developing method by preparing an electrostatic charge developing toner having specified saturation magnetization, a titanium component and dynamic hardness, and to provide a method for forming an image. SOLUTION: In the toner containing at least a binder resin and a black colorant, the toner essentially comprising an electrostatic charge image developing toner having the following properties. The black colorant consists of a black iron oxide compound having 0.5 to 30 emu/g saturation magnetization σs and 10 to 45 wt.% titanium content in terms of Ti atoms with respect to Fe atoms. The dynamic hardness of the toner measured by a SHIMADZU Dynamic Ultra-Micro Hardness Tester (DUH-W201/W201S) is 3 to 11 (gf/μm2). COPYRIGHT: (C)2005,JPO&NCIPI
Bibliography:Application Number: JP20030328646