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Toner

a technology of toner and abrasive, which is applied in the field of toner, can solve the problems of inability to obtain particulate polymers with small molecular weight distributions (mw/mn=about 2 or less), high cost of fluorochemical surfactants used in this method, and achieve the effect of small molecular weight distribution

Inactive Publication Date: 2012-05-24
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0020]Accordingly, an object of the present invention is to provide a toner having a small molecular weight distribution, a low-temperature fixability, heat and humidity resistance, and environmental stability.

Problems solved by technology

However, a fluorochemical surfactant used in this method is very expensive and has a problem in terms of safety.
Further, particulate polymers having small molecular weight distributions (Mw / Mn=about 2 or less) cannot be obtained.
However, particulate polymers having a molecular weight distribution (Mw / Mn) of 2 or less cannot be obtained, either.
This does not disclose a ring-opening polymerizable monomer.
However, when the polyester is used as a resin for a toner, the toner has a high softening point and a high fixable temperature, and therefore this is unsuitable in terms of saving energy.
The softening point of a toner can be lowered, but the wax agglutinates the toner and productivity of the toner deteriorates, and fluidity thereof also deteriorates, resulting in deterioration of feedability thereof in an image developer.
However, when the content of the biodegradable resin is high, it is not well dispersed, resulting in deterioration of developability due to uneven chargeability and deterioration of durability.
Further, this is not particularly specified, but the biodegradable resin deteriorates a glass transition temperature and a heat distortion temperature because of absorbing moisture.
Therefore, it has a defect of agglutination of particles or images when transported or stored in hot and humid conditions, which is unusable.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

synthesis example 1

Synthesis of Surfactant 2

[0156]1,250 parts of 1H, 1H-perfluorooctylacrylate from AZ max. co. and 62.5 parts of 2,2′-azobis(2,4-dimethylvaleronitrile) V-6 from Wako Pure Chemical Industries, Ltd. were filled in a pressure resistant reaction cell (50 volume % of a pressure resistant container cell). Carbone dioxide as a supercritical fluid was fed into the reaction cell by a feed cylinder, and a reaction was performed for 24 hrs at 15 Mpa and 85° C. while controlled by a pressure pump and a heat regulator. Next, the temperature was decreased to 0° C. and the pressure was reduce to normal pressure using a back pressure valve to prepare a surfactant 2 having the following formula. The surfactant 2 had a number-average molecular weight (Mn) of 2,500.

wherein q is an integer representing a repeat unit.

synthesis example 2

Synthesis of Surfactant 3

[0157]In a 6-ml vial container, 36.1 parts of polyacrylate 5,000 from Wako Pure Chemical Industries, Ltd., 1,480 parts of chloroform from Wako Pure Chemical Industries, Ltd. and 128 parts of 1,1′-carbonylbis-1H-imidazole were placed and stirred for 10 min at room temperature.

[0158]Next, 500 parts of polyethylene glycol having a molecular weight of 200 from Wako Pure Chemical Industries, Ltd. were added thereto and stirred for 12 hrs.

[0159]Then, chloroform was added thereto, and washed with water.

[0160]Next, the mixture was dried with anhydrous sodium sulfate, filtered, and further vacuum-concentrated to prepare a surfactant 3 having the following formula (yield rate 73% by weight). The surfactant 3 had a number-average molecular weight (Mn) of 5,200.

wherein each of r and p is an integer representing a repeat unit.

synthesis example 3

Synthesis of Surfactant 4

[0161]In a 50-ml flask having the shape of an egg plant, 12 parts of side-chain carboxy-modified silicone oil KF-8012 having a molecular weight 4,500 from Shin-Etsu Chemical Co., Ltd., 33.3 parts of chloroform from Wako Pure Chemical Industries, Ltd., 1,1′-carbonylbis-1H-imidazole and 1.3 parts of polyethylene glycol having a molecular weight of 200 from Wako Pure Chemical Industries, Ltd. were placed and stirred for 12 hrs at room temperature.

[0162]Next, saturated sodium hydrogen carbonate aqueous solution was added to the mixture to precipitate sodium stearate, which was filtered with a Kiriyama funnel and washed with saturated sodium hydrogen carbonate aqueous solution.

[0163]Then, the mixture was dried with anhydrous sodium sulfate, filtered with a silica gel, and further vacuum-concentrated to prepare a surfactant 4 having the following formula (yield rate 91% by weight). The surfactant 3 had a number-average molecular weight (Mn) of 4,700.

wherein each o...

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Abstract

A toner prepared by a method comprising granulating while polymerizing a ring-opening polymerizable monomer with a catalyst under the presence of a surfactant and a colorant in a compressible fluid.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This patent application is based on and claims priority pursuant to 35 U.S.C. §119 to Japanese Patent Application No. 2010-257476, filed on Nov. 18, 2010, in the Japanese Patent Office, the entire disclosure of which is hereby incorporated herein by reference.FIELD OF THE INVENTION[0002]The present invention relates to a toner prepared by heterogeneously polymerizing a ring-opening polymerizable monomer in a compressible fluid.BACKGROUND OF THE INVENTION[0003]Methods of heterogeneously polymerizing a monomer in a supercritical carbon dioxide to prepare a particulate polymer, such as emulsion polymerization, dispersion polymerization and suspension polymerization are well known.[0004]The heterogeneous polymerization in a supercritical carbon dioxide is used for preparing particulate polymers from various monomers because of having the following advantages compared with heterogeneous polymerizations in water or organic solvents:[0005](1) so...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): G03G9/16
CPCC08G63/79C08G63/81C08G63/823G03G9/08795G03G9/0808G03G9/0812G03G9/0815G03G9/0806
Inventor YAMAUCHI, YOSHITAKATANAKA, CHIAKINEMOTO, TAICHI
Owner RICOH KK
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