Process for producing toner for electrophotography

Details Process for producing toner for electrophotography Process for producing toner for electrophotography

2007-09-07

2010-06-01

Goodrow, John L (Department: 1795)

Radiation imagery chemistry: process, composition, or product th

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

Process of making developer composition

C430S110300, C430S110400

Reexamination Certificate

active

07727699

ABSTRACT:
The present invention relates to a process for producing a toner for electrophotography, including:(a) a step of aggregating resin particles containing a resin binder in an aqueous medium; and(b) a step of unifying the aggregated resin particles,the step (a) including:(a-1) a step of adding a monovalent salt as an aggregating agent; and(a-2) a step of adding at least one compound selected from the group consisting of alkylethersulfates represented by the formula (1):in-line-formulae description="In-line Formulae" end="lead"?R—O—(CH2CH2O)nSO3M  (1)in-line-formulae description="In-line Formulae" end="tail"?wherein R is an alkyl group; n represents an average molar number of addition and is a number of more than 0 and not more than 15 (0<n≦15), and M is a monovalent cation, alkylsulfates and linear alkylbenzenesulfonates. The toner of the present invention has a small particle size which is controlled with a high accuracy, and a sharp particle size distribution, and a particle shape of the toner is readily controlled even at a low temperature, and further the obtained toner exhibits a high circularity.

REFERENCES:
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patent: 2003/0113647 (2003-06-01), Matsushima et al.
patent: 2006/0105262 (2006-05-01), Sata et al.
patent: 7-146584 (1995-06-01), None
patent: 2002-131978 (2002-05-01), None
patent: 2003-66648 (2003-03-01), None
patent: 2004-295028 (2004-10-01), None

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