Wax dispersant for toner and toner

A technology of wax dispersant and toner, applied in the field of wax dispersant for toner, can solve the problems of deterioration of toner charging performance, deterioration of toner fluidity, etc. blocky effect

Active Publication Date: 2019-02-15
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] Here, although the heat treatment controls the toner shape, it is known that this process causes wax with high adhesion to be eluted near the toner surface
As a result, the fluidity of the toner is deteriorated under the influence of the wax that has eluted to the vicinity of the toner surface, and the charging performance of the toner may be deteriorated
[0014] From the above, there is still room for research aimed at controlling the dispersion state of wax in toner while ensuring charging performance, low-temperature fixability, and anti-blocking properties of toner

Method used

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  • Wax dispersant for toner and toner
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  • Wax dispersant for toner and toner

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Experimental program
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preparation example Construction

[0253] (1) Preparation of reagents

[0254] A phenolphthalein solution was obtained by dissolving 1.0 g of phenolphthalein in 90 mL of ethanol (95 vol%) and adding deionized water to 100 mL.

[0255] A total of 7 g of reagent grade sodium chloride was dissolved in 5 mL of deionized water and 1 L was obtained by adding ethanol (95 vol%). The solution was put into an alkali-resistant container, and allowed to stand there for 3 days to prevent contact with carbon dioxide, etc., and then filtered to obtain a potassium hydroxide solution. Store the resulting potassium hydroxide solution in an alkali-resistant container. Add a total of 25mL of 0.1mol / L hydrochloric acid into the Erlenmeyer flask, add a few drops of phenolphthalein solution, titrate with potassium hydroxide solution, and obtain the factor of potassium hydroxide solution from the amount of potassium hydroxide solution required for neutralization. 0.1 mol / L hydrochloric acid was prepared for use according to JIS K 80...

Embodiment

[0265] Hereinafter, the present invention will be described in more detail with reference to Preparation Examples and Embodiments, but the present invention is not limited thereto. All parts and percentages in the following formulations are by mass unless otherwise stated.

[0266]

[0267] A total of 300.0 parts of xylene and 10.0 parts of polypropylene (melting point 90° C.) were put into an autoclave reaction vessel equipped with a thermometer and a stirrer, and the polypropylene was completely dissolved. After nitrogen replacement, at 180°C, after 3 hours, a mixed solution of 68.0 parts of styrene, 5.0 parts of methacrylic acid, 5.0 parts of cyclohexyl methacrylate, 12.0 parts of butyl acrylate and 250.0 parts of xylene was added dropwise to to aggregate. Then, the reaction system was kept at this temperature for 30 minutes, and the solvent was removed to obtain wax dispersant A1. The composition, weight average molecular weight and acid value of the obtained wax dispe...

preparation example

[0298]

[0299] - Polyoxypropylene(2.8)-2,2-bis(4-hydroxyphenyl)propane: 76.6 parts (0.17 mol; 100.0 mol% based on the total moles of polyol)

[0300] - Terephthalic acid: 17.4 parts (0.10 mol; 72.0 mol% based on the total moles of polycarboxylic acids)

[0301] - Adipic acid: 6.0 parts (0.04 mol; 28.0 mol% based on the total moles of polycarboxylic acids)

[0302] - Tetrabutyl titanate (esterification catalyst): 0.5 parts

[0303] The above materials were weighed in a reaction vessel equipped with a cooling tube, a stirrer, a nitrogen gas introduction tube and a thermocouple.

[0304] After the atmosphere inside the reaction vessel was replaced with nitrogen, the temperature was gradually raised under stirring, and the reaction was performed at a temperature of 200° C. for 4 h under stirring.

[0305] Then, the pressure of the reaction vessel was reduced to 8.3 kPa and maintained for 1 h. Then, cooling to 180° C. was performed, and the pressure was returned to atmospheri...

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PUM

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Abstract

A wax dispersant for a toner and the toner are provided; the wax dispersant for the toner includes a polymer obtained by graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound, and a toner including a toner particle that contains a binder resin, a wax, and a polymer obtainedby graft polymerization of a styrene-acrylic resin onto a hydrocarbon compound, wherein the styrene-acrylic resin has a structural segment derived from a saturated alicyclic compound.

Description

[0001] This application is a divisional application of an application with a filing date of August 23, 2016, an application number of 201610709698.3, and an invention title of "wax dispersant and toner for toner". technical field [0002] The present invention relates to a wax dispersant for toner and a toner including the wax dispersant for toner. Background technique [0003] In recent years, electrophotographic full-color copiers have become widely used, and are also beginning to be applied to the printing market. The printing market requires high speed, high image quality and high productivity as well as adaptability to a wide range of media (paper types). [0004] A specific example of such a requirement is "medium constant velocity capability" in which, even when the paper type is changed from thick to thin, without changing the processing speed to match the paper type or changing the fixing device's In the case of setting the heating temperature, continuous printing ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/08
CPCG03G9/08
Inventor 大津刚釜江健太郎松尾龙一郎岩崎阳介胜间田和起子三浦正治石上恒沟尾祐一满生健太
Owner CANON KK
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