Black toner with defined loss tangent

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

2006-04-04

2006-04-04

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...

C430S108900, C430S109300, C430S109400

Reexamination Certificate

active

07022449

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 tan δ (103to 104Hz) of the toner is represented by the following expression:in-line-formulae description="In-line Formulae" end="lead"?tan δ(103to 104Hz)≦0.0060in-line-formulae description="In-line Formulae" end="tail"?where the loss tangent tan δ is represented by ∈″/∈′ where ∈″ denotes dielectric loss factor and ∈′ denotes dielectric constant, and tan δ (103to 104Hz) denotes the loss tangent in a frequency range of 103to 104Hz; and a ratio of tan δ (105Hz) to tan δ (5×104Hz) is represented by the following expression:in-line-formulae description="In-line Formulae" end="lead"?1.05≦tan δ(105Hz)/tan δ(5×104Hz)≦1.40in-line-formulae description="In-line Formulae" end="tail"?where tan δ (105Hz) denotes loss tangent at the frequency of 105Hz and tan δ (5×104Hz) denotes loss tangent at the frequency of 5×104Hz.

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