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Liquid developing agent and process for producing the same

a technology of developing agent and liquid, which is applied in the direction of polarizing elements, instruments, transportation and packaging, etc., can solve the problems of increasing viscosity, lowering electric resistance, and unable to maintain dispersion stability and charging characteristics sufficiently, and achieve excellent developing properties and high solid content

Inactive Publication Date: 2010-03-11
IWASE KOJI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The solution enables the production of a liquid developing agent with high solid content concentration while maintaining excellent dispersion stability and electric resistance, effectively addressing the limitations of previous methods.

Problems solved by technology

In recent years, however, from the points of higher developing speed, mileage and recovery of electrically insulating solvents, requirements on further high solid content of liquid developing agent have been done, but in the above-described method, it is fundamentally difficult to maintain dispersion stability and charging characteristics sufficiently, thus there has had a problem that increase in viscosity and lowering of electric resistance occur with increase in the solid content concentration of a liquid developing agent.

Method used

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  • Liquid developing agent and process for producing the same
  • Liquid developing agent and process for producing the same
  • Liquid developing agent and process for producing the same

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0102]After cooling the milled product (colored chip) obtained by melt kneading of 250 parts of Pigment blue 15:3 and 750 parts of thermoplastic resin 1 at 140° C. using a hot three-roll mill, it was pulverized using a jet mill (manufactured by Nippon Pneumatic Mfg. Co., Ltd.). Next, 140 parts of this coarse pulverized powder, 8.8 parts of pigment dispersant 1 and 551.2 parts of paraffin based solvent with a high boiling point (Moresco White P-40) were subjected to wet pulverization at 40° C. for about 90 minutes using Eiger mill (trade name M-250) filled with zirconia beads of 0.5 mm diameter, thereby to give a liquid developing agent 1 with a solid content concentration of 21.3%.

example 2

[0103]After cooling the milled product (colored chip) obtained by melt kneading of 250 parts of Pigment blue 15:3 and 750 parts of thermoplastic resin 1 at 140° C. using a hot three-roll mill, it was pulverized using a jet mill (manufactured by Nippon Pneumatic Mfg. Co., Ltd.). Next, 140 parts of this coarse pulverized powder, 5.3 parts of pigment dispersant 1 and 554.7 parts of paraffin based solvent with a high boiling point (Moresco White P-40) were subjected to wet pulverization at 40° C. for about 90 minutes using Eiger mill (trade name M-250) filled with zirconia beads of 0.5 mm diameter, thereby to give a liquid developing agent 2 with a solid content concentration of 20.8%.

example 3

[0104]After cooling the milled product (colored chip) obtained by melt kneading of 333 parts of Pigment blue 15:3 and 667 parts of thermoplastic resin 1 at 140° C. using a hot three-roll mill, it was pulverized using a jet mill (manufactured by Nippon Pneumatic Mfg. Co., Ltd.). Next, 210 parts of this coarse pulverized powder, 5.3 parts of pigment dispersant 1 and 484.7 parts of paraffin based solvent with a high boiling point (Moresco White P-40) were subjected to wet pulverization at 40° C. for about 90 minutes using Eiger mill (trade name M-250) filled with zirconia beads of 0.5 mm diameter, thereby to give a liquid developing agent 3 with a solid content concentration of 30.8%.

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Abstract

A liquid developing agent for electrophotography or electrostatic recording that can realize a high solid content and has excellent developing properties is characterized in that colored chips produced by heat kneading a pigment with a thermoplastic resin are dispersed by wet pulverization in an electrically insulating hydrocarbon solvent containing at least one pigment dispersant selected from the group consisting of specific modified novolak resins (A) having an aromatic ring and a ring opened structure of an epoxy group by a hydroxycarboxylic acid-derived carboxyl group, and copolymers (B).

Description

RELATED APPLICATION[0001]This is a U.S. national phase patent application under 35 U.S.C. §371 of International Application No. PCT / JP2006 / 310311 filed May 24, 2006, which claims priority of Japanese Patent Application No. 2005-154073 filed May 26, 2005.TECHNICAL FIELD[0002]The present invention relates to a liquid developing agent for electrophotography and electrostatic recording used in a printing machine, copier, printer, and facsimile.BACKGROUND ART[0003]Liquid developing agents for electrophotography and electrostatic recording used in a copier, printer, and facsimile are broadly classified into a dry developing agent and a liquid developing agent, and it is thought that particle diameter of toner particle is smaller in a liquid developing agent, which is greatly advantageous to obtain a high quality photographic image. From this reason, in market there have been required liquid developing agents capable of forming a high quality photographic image with high image density and ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G9/09G03G9/08
CPCG02B5/3083G02F1/13363G02F2001/133635Y10T428/1041G02F2201/50G02F2202/40Y10T428/1036G02F2001/133637C09K2323/03C09K2323/031G02F1/133635G02F1/133637C08J5/18G02B5/30
Inventor IWASE, KOJI
Owner IWASE KOJI