Resin microparticle as raw material for toner, aqueous dispersed system thereof and toner

a technology of toner and resin microparticles, applied in the field of resin microparticles as raw materials for toner, aqueous dispersed systems thereof, can solve the problems of deterioration of image quality, high energy requirements in some cases, and easy contamination of toner carriers, etc., and achieve excellent image quality.
US20070082285A1Inactive Publication Date: 2007-04-12MITSUI CHEM INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Applications(United States)
Current Assignee / Owner
MITSUI CHEM INC
Publication Date
2007-04-12
Estimated Expiration
Not applicable · inactive patent

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Abstract

A resin microparticle for a toner raw material that has a small particle diameter and a narrow particle diameter distribution and has a low odor is provided. The resin microparticle for a toner raw material has the following requirements (i) to (iii) satisfied: Requirement (i): A particle diameter of 50% volume (D50) satisfies the relationship 0.05 μm≦D50≦1 μm; Requirement (ii): A particle diameter of 10% volume (D10) and a particle diameter of 90% volume (D90) satisfy the relationship D90 / D10≦7; and Requirement (iii): The content of an organic solvent is not more than 70 ppm.
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Description

TECHNICAL FIELD

[0001] The present invention relates to a resin microparticle for a toner raw material which has a uniform particle shape and form, an aqueous dispersed system having a microparticle in a disperse phase, and a toner comprising the microparticle. BACKGROUND ART

[0002] As production method of a toner for electrostatic development, a kneading and grinding method has been widely used. A toner for electrostatic development obtained by that method tends to has a wide particle size distribution and has a lot of coarse powders and fine powders. Therefore, it is pointed out that the deterioration of image quality and a carrier pollution by the toner easily occur. Furthermore, for producing a toner having a small particle diameter and a narrow particle size distribution by the kneading and grinding method, much energy may be required in some cases.

[0003] As a method for producing an aqueous dispersed system of a resin microparticle, a method using a twin screw extruder has be...

Claims

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