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Patent EP0306330A2 successfully refreshed from Google Patents.
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EP0306330A2 Expired / Lapsed EP ⏱️ 0.0 years remaining

Toner and process for preparation thereof

Assignee: Soken Kagaku KK
•
Filing: 1988-09-02
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Granted: —
•
Expires: 2008-09-02
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Abstract

Abstract Toner particles are described, each particle comprising a spheroidal resin core, a pigment layer on the surface of said core and a layer of a static electrification controlled resin on the surface of said pigment layer. The state of static electrification of the toner is substantially deter­mined by that of the outermost layer of the static electrification con­trolled resin, and thus can be precisely controlled by simply control­ling the amount of static electrification of the resin particles used to form the outermost layer. Since the state of static electrification of the toner can be precisely controlled, the kind and concentration of the pigment used can be freely selected. The presence of the outermost layer 3 prevents the pigment from breaking away from the toner. Further, it is possible to improve the fluidity and anti-block properties of the toner without any adverse effect. In addition, it is not necessary to use an additional static electrification controlling agent such as silica which might adversely affect the color shade of the toner.

Inventors

  • 👤 Tatsuhiro C/O Soken Chemical & Imai
  • 👤 Susumu C/O Soken Chemical & Kawase

Bibliographic Details

Application Number —
Jurisdiction EP
Data Source google_patents
Last Synchronized 2026-11-07 01:47
CPC Classifications
G; G03; G03G; G03G5/00; G03G9/00; G03G9/08; G03G9/0802; G03G9/0825

Claims Analysis

Total Claims: 8
Claim 1
Independent Claim 33 words
Toner particles,each particle comprising a spheroidal resin core, a pigment layer on the surface of said core and a layer of a static electrification controlled resin on the surface of said pigment layer.
Claim 2
Dependent Claim 33 words
Toner particles,each particle comprising a spheroidal resin core, a pigment layer on the surface of said core and a layer of a static electrification controlled resin on the surface of said pigment layer.
Claim 3
Dependent Claim 21 words
Toner particles as claimed in claim 1 wherein the core diameter is between 0.5 and 50µm, preferably between 1 and 10µm.
Claim 4
Dependent Claim 46 words
Toner particles as claimed in claim 1 or claim 2 wherein the pigment layer is formed from a particulate pigment having a primary particle size of from 0.01 to 2µm, preferably from 0.02 to 0.2µm, and the layer has a thickness of from 0.05 to 2µm.
Claim 5
Dependent Claim 46 words
Toner particles as claimed in any of claims 1 to 3 wherein the particle size of the resin which forms the surface is from 0.05 to 5µm, preferably from 0.1 to 1.0µm, and does not exceed one fifth of the particle size of the spheridal core.
Claim 6
Dependent Claim 29 words
Toner particles as claimed in any of claims 1 to 4 wherein the absolute amount of static electrification of the resin particles forming the surface is at least 50µC/g.
Claim 7
Dependent Claim 89 words
A process for the preparation of a toner particle compris­ing the steps of adhering pigment particles to the surface of a spheroidal resin core, microcapsulating said pigment particles to form a pigment layer on the surface of said core, adhering particles of a static electrification controlled resin on the surface of said pigment layer formed on said core and microcapsulating said particles of the static electrification controlled resin to form a layer of the static electrification controlled resin on the surface of said pigment layer formed on said core.
Claim 8
Dependent Claim 89 words
A process for the preparation of a toner particle compris­ing the steps of adhering pigment particles to the surface of a spheroidal resin core, microcapsulating said pigment particles to form a pigment layer on the surface of said core, adhering particles of a static electrification controlled resin on the surface of said pigment layer formed on said core and microcapsulating said particles of the static electrification controlled resin to form a layer of the static electrification controlled resin on the surface of said pigment layer formed on said core.

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