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Toner for developing electrostatic image

An electrostatic charge image and toner technology, which is applied in the direction of developer, electrography, instrument, etc., can solve the problems of toner scattering, background fog, inability to fully meet the heat resistance preservation and crush resistance, etc. Achieves sufficient low-temperature fixability, excellent heat-resistant storage, and crush resistance

Active Publication Date: 2014-08-13
KONICA MINOLTA INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a result, there are problems such as scattering of poorly charged toner and background fogging of images.
[0014] As a result, although the toner using the crystalline resin can ensure the low-temperature fixing property which is an advantage of the crystalline resin, it cannot fully satisfy the heat-resistant storage and the crush resistance.

Method used

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  • Toner for developing electrostatic image
  • Toner for developing electrostatic image
  • Toner for developing electrostatic image

Examples

Experimental program
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Effect test

Embodiment

[0218] Hereinafter, specific examples of the present invention will be described, but the present invention is not limited to these examples.

Synthetic example 1

[0220] First, add p-toluenesulfonic acid monohydrate (8g) to a mixture of ethyl pyruvate (315g, 2.7mol) and acetic anhydride (554g, 5.4mol), and stir at 120°C for 24 hours under nitrogen flow to obtain a reaction solution . Next, after removing acetic acid produced by the reaction with excess acetic anhydride from the reaction solution under reduced pressure (40-50 mmHg), the residue is purified by distillation under reduced pressure (35-40 mmHg, 90-103°C) to obtain α - Ethyl acetoxyacrylate (250 g, 58% yield).

[0221] It should be noted that α-acetoxy ethyl acrylate can be used as a specific acrylic monomer represented by the above-mentioned general formula (1) (R in the general formula (1) 1 is methyl, R 2 is ethyl, R 3 and R 4 are all hydrogen atoms) or specific acrylic monomers represented by the above general formula (2) (R in general formula (2) 5 is methyl, R 6 is ethyl, R 7 and R 8 all hydrogen atoms) monomers. Hereinafter, this α-acetoxy ethyl acrylate is al...

Synthetic example 2

[0223]First, a solution of pyruvic acid (440 g, 5.0 mol), n-butanol (371 g, 5.0 mol) and p-toluenesulfonic acid monohydrate (2.5 g) in toluene (1 L) was heated to reflux for 16 hours while removing water under a nitrogen stream. , to obtain the first reaction solution. Next, after cooling the first reaction solution to room temperature (25°C), toluene was removed under reduced pressure (40mmHg) using an evaporator, and the residue was purified by vacuum distillation (40mmHg, 93-100°C) to obtain pyruvic acid Butyl ester (505g, yield 70%).

[0224] Next, p-toluenesulfonic acid monohydrate (5 g) was added to the mixture of butyl pyruvate (235 g, 1.6 mol) and acetic anhydride (333 g, 3.3 mol) obtained, and stirred at 120 ° C for 25 hours under nitrogen flow to obtain Second reaction solution. Next, after removing the acetic acid produced by the reaction with excess acetic anhydride from the second reaction solution under reduced pressure (5mmHg), the residue was purified by dist...

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PUM

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Abstract

Provided is a toner for developing an electrostatic image. The toner has excellent heat-resistant storage properties and crush resistance while having sufficient low temperature fixability. The toner for developing an electrostatic image includes toner particles that contain at least a binder resin. The binder resin contains a polymer prepared by polymerizing a polymerizable monomer represented by a following general formula (1). In the general formula (1), R1 and R2 each independently represent an aliphatic hydrocarbon group having 1 to 60 carbon atoms, an aliphatic group wherein some of carbon atoms of the aliphatic hydrocarbon group are substituted with an oxygen atom, or an aromatic hydrocarbon group optionally having the aliphatic hydrocarbon group or the aliphatic group as a substituent; and R3 and R4 each independently represent a hydrogen atom or an aliphatic hydrocarbon group.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image (hereinafter also simply referred to as “toner”) used in electrophotographic image formation. Background technique [0002] Conventionally, as resin materials used in toners, for example, polystyrene resins, styrene-acrylic copolymer resins, polyester resins, epoxy resins, butyral resins, acrylic resins with grafted Hybrid resins, such as polyester resins, etc., have been designed based on the use of toners. [0003] In particular, toner resin materials for heating roller fixing are required to improve fixability to recording media and offset resistance, and high molecular weight thermoplastic resins or partially crosslinked thermoplastic resins have been mainly used so far. [0004] With the increase in speed and energy saving of printers and copiers, there is an increasing demand for toners with excellent low-temperature fixability. High, it is difficult to achiev...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087
CPCG03G9/08797G03G9/08728
Inventor 午庵一贺神山干夫田所肇
Owner KONICA MINOLTA INC
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