Black toner with defined loss tangent

Details Black toner with defined loss tangent Black toner with defined loss tangent

2007-11-27

2007-11-27

Rodee, Christopher (Department: 1756)

Radiation imagery chemistry: process, composition, or product th

Electric or magnetic imagery, e.g., xerography,...

Post imaging process, finishing, or perfecting composition...

C430S109300, C430S109400, C430S111400

Reexamination Certificate

active

11225169

ABSTRACT:
To provide a black toner having excellent charging property and transferring property against a severe environmental change. The black toner includes toner particle containing at least a binder resin, carbon black and a releasing agent, wherein: the toner particles have a weight-average particle diameter of 3.5 to 8.0 μm; total amount of acid value and hydroxyl value of the toner is 30 to 75 mgKOH/g; average circularity of particles contained in the toner having circle-equivalent diameter of 2 μm or more is 0.915 to 0.960; loss tangent tanδ (103to 104Hz) of the toner is represented by the following expression:in-line-formulae description="In-line Formulae" end="lead"?tanδ (103to 104Hz)≦0.0060in-line-formulae description="In-line Formulae" end="tail"?where the loss tangent tanδ is represented by ε″/ε′ where ε″ denotes dielectric loss factor and ε′ denotes dielectric constant, and tanδ (103to 104Hz) denotes the loss tangent in a frequency range of 103to 104Hz; and a ratio of tanδ (105Hz) to tanδ (5×104Hz) is represented by the following expression:in-line-formulae description="In-line Formulae" end="lead"?1.05≦tanδ (105Hz)/tanδ (5×104Hz)≦1.40in-line-formulae description="In-line Formulae" end="tail"?where tanδ (105Hz) denotes loss tangent at the frequency of 105Hz and tanδ (5×104Hz) denotes loss tangent at the frequency of 5×104Hz.

REFERENCES:
patent: 4904560 (1990-02-01), Yamashiro et al.
patent: 6030737 (2000-02-01), Ugai et al.
patent: 6586147 (2003-07-01), Iida et al.
patent: 6656654 (2003-12-01), Higuchi et al.
patent: 2002/0081513 (2002-06-01), Higuchi et al.
patent: 2003/0165760 (2003-09-01), Higuchi et al.
patent: 1 069 479 (2001-01-01), None
patent: 1 205 810 (2002-05-01), None
patent: 49-42354 (1974-04-01), None
patent: 55-26518 (1980-02-01), None
patent: 58-60754 (1983-04-01), None
patent: 61-277964 (1986-12-01), None
patent: 64-35457 (1989-02-01), None
patent: 1-145664 (1989-06-01), None
patent: 7-64337 (1995-03-01), None
patent: 10-186713 (1998-07-01), None
Diamond, Arthur S & David Weiss (eds.) Handbook of Imaging Materials. New York: Marcel-Dekker, Inc. (Nov. 2001) pp. 178-182.

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