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Positive charge control agent, method for production of the agent, and electrophotographic toner using the agent

A manufacturing method and control agent technology, applied in the direction of developer, electrography, instrument, etc., can solve the problems of reduced charging performance, charging performance, coloring performance, and printing quality of positive charge control agents, and achieve the purpose of suppressing the generation of VOC , Excellent charging performance and colorability, and the effect of preventing color development

Active Publication Date: 2009-01-07
FUJIKURA KASEI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] However, if a peroxide-based initiator is used, the charging performance of the obtained positive charge control agent will be lowered, or it will be dark brown
Therefore, toner containing a positive charge control agent obtained by using a peroxide-based initiator may have reduced charging performance and colorability, and color toners may affect color, and as a result, print quality may decrease. question

Method used

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  • Positive charge control agent, method for production of the agent, and electrophotographic toner using the agent
  • Positive charge control agent, method for production of the agent, and electrophotographic toner using the agent
  • Positive charge control agent, method for production of the agent, and electrophotographic toner using the agent

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0069] (Manufacture of positive charge control agent)

[0070] Put reaction solvent isobutanol 180g in the 2L flask that has stirrer, condenser, thermometer, nitrogen inlet tube, and then add (meth) diethylaminoethyl acrylate 18g and methyl p-toluenesulfonate 18g, at 80 °C under nitrogen and stirred for 1 hour to carry out quaternization reaction. Thereafter, 210 g of styrene, 72 g of butyl acrylate, and 12 g of tert-butyl peroxy-2-ethylhexanoate (manufactured by Alkema Jifu) as a peroxide initiator were added while blowing nitrogen gas, and the temperature was raised to 95° C. (polymerization temperature) After stirring for 3 hours, 6 g of tert-butyl peroxy-2-ethylhexanoate was added and stirred for 3 hours to obtain a polymer solution.

[0071] The polymer solution was heated and dried under reduced pressure (product temperature: 140° C., reduced pressure to 10 kPa or less), and the solvent component was removed to obtain a polymer. The polymer is pulverized to form a posi...

Embodiment 2～8 and comparative example 4

[0102] As shown in Table 1, a positive charge control agent was produced in the same manner as in Example 1 except that the type of polymerization initiator used was changed. However, n-butanol was used instead of isobutanol in Example 8, resulting in a polymerization temperature of 115°C. In addition, in Comparative Example 4, an azo initiator was used instead of a peroxide initiator.

[0103] Furthermore, each toner was produced based on the production method of the toner shown in Table 1. The same various measurements and evaluations as in Example 1 were performed on these. The results are shown in Table 1.

Embodiment 9 and 10

[0105] A positive charge control agent and a toner were produced in the same manner as in Example 1. However, embodiment 9 has used 18g diethylaminoethyl (meth)acrylate, 2g methyl p-toluenesulfonate and 242g styrene, so that the copolymerization ratio of each monomer is (M1)+(M2):(M3) =98.7:1.3.

[0106] In addition, embodiment 10 has used 45g diethylaminoethyl (meth)acrylate, 45g methyl p-toluenesulfonate and 156g styrene, and the copolymerization ratio of each monomer is (M1)+(M2):(M3) =71.7:28.3.

[0107] The same various measurements and evaluations as in Example 1 were performed on these. The results are shown in Table 1.

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Abstract

Disclosed are: a positive charge control agent which has good compatibility with a binder resin and good dispersibility, can prevent tinting, is excellent in charging properties, can reduce the content of a low-boiling-point organic compound and has no sensible odor; a method for production of the positive charge control agent; and an electrographic toner which is excellent in charging properties and coloring properties and is reduced in the formation of any VOC. The positive charge control agent comprises a copolymer prepared by copolymerizing a styrene monomer (M1), a (meth)acrylic acid alkyl ester monomer (M2) and a quaternary ammonium salt (M3) of a dialkylaminoalkyl (meth)acrylate monomer, wherein the copolymer has the following monomer ratio (mass %): (M1)+(M2):(M3) = 99.5:0.5 to 65:35, and at least one terminus of the copolymer is RCOO- or RO- (wherein R represents an alkyl group, an aryl group, an aralkyl group or an alicyclic group).

Description

technical field [0001] The present invention relates to a toner for electrophotography (toner) for making an electrostatic image into a visible image in electrophotography, a positive charge control agent for a toner for electrophotography, and a method for producing the same. [0002] This application claims priority based on Japanese Patent Application No. 2006-148320 filed in Japan on May 29, 2006, the contents of which are incorporated herein by reference. Background technique [0003] Various electrophotography methods are known, but the usual method is to form a latent image caused by static electricity on a photoconductive material (photoreceptor), and then make the toner particles in which a colorant is dispersed to make the latent image visible. Adhere to the binder resin, copy the toner image on the medium such as paper or plastic film if necessary, and fix the toner image on the medium by heat, pressure, etc. [0004] Toner particles generally contain a colorant,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/097
CPCG03G9/0904G03G9/08782G03G9/08755G03G9/08711G03G9/09741G03G9/081G03G9/0918G03G9/08791
Inventor 石本贵幸谷田部真司
Owner FUJIKURA KASEI CO LTD
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