Supercharge Your Innovation With Domain-Expert AI Agents!

Toner and process for producing same

A technology of toner and colorant, which is applied in the field of toner and its manufacture, can solve problems such as reduction, fragility and durability of toner, and achieve the effects of improved miscibility and good heat offset resistance

Inactive Publication Date: 2014-01-01
SHARP KK
View PDF8 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0015] However, the toner produced by the method disclosed in Patent Document 1 has the problem that if the rosin content in the resin composition for toner is increased in order to increase the biomass utilization rate, the toner will be weak and durable. reduce

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Toner and process for producing same
  • Toner and process for producing same
  • Toner and process for producing same

Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0050] In the preparation of the polyester resin A, as raw materials, an aromatic dicarboxylic acid and a rosin are used as an acid component, and a trivalent or higher alcohol is used as a polyhydric alcohol. Aromatic dicarboxylic acids and higher than trihydric alcohols are reacted to form moderately branched polyol structures.

[0051] When the polyester resin contains a moderately branched structure, the low-temperature fixability of the toner can be maintained without extremely increasing the softening temperature of the resin, and the molecular weight distribution of the resin can be expanded. Therefore, it is possible to obtain a resin having a wide distribution on the high molecular weight side, and thus improve the offset resistance of the toner.

[0052] Examples of aromatic dicarboxylic acids as acid components used in the preparation of polyester resin A include phthalic acid, terephthalic acid, isophthalic acid, biphenyl dicarboxylic acid, naphthalene dicarboxylic...

Embodiment

[0139] Hereinafter, the present invention will be described in detail with reference to examples and comparative examples.

[0140] The physical properties of Examples and Comparative Examples were measured as described below.

[0141] Glass transition temperature (Tg) of polyester resin

[0142] Using a differential scanning calorimeter (trade name: Diamond DSC, available from PerkinElmer Co., Ltd.), according to Japanese Industrial Standard (JIS) K7121-1987, at 10°C per minute (10 0.01 g sample is heated to measure the DSC curve at a heating rate of ℃ / min).The straight line obtained by extending the baseline of the low temperature side of the endothermic peak corresponding to the glass transition to the high temperature side in the obtained DSC curve is the same as that obtained at the opposite The temperature at the intersection between the tangent lines drawn at the point of the maximum gradient of the curve on the low temperature side of the endothermic peak was determin...

preparation example 1

[0161] Preparation of polyester resin A-1

[0162] 305 g of terephthalic acid, 55 g of isophthalic acid, 30 g of trimellitic anhydride, and 1400 g of disproportionated rosin ( Acid value: 157.2mgKOH / g); 300g glycerol and 150g1,3-propanediol as the alcohol component; 1.79g tetra-n-butyl titanate (relative to the total amount of the acid component and the alcohol component 100 parts by weight, equivalent to at 0.080 parts by weight). These materials were stirred under a nitrogen atmosphere to perform a polycondensation reaction at 250° C. for 10 hours while distilling off generated water. When it is confirmed with a flow tester that the predetermined softening temperature is reached, the reaction is stopped. Thus, 2015 g (yield: 90%) of polyester resin A-1 (glass transition temperature: 60° C., softening temperature: 112° C., weight average molecular weight: 2800, Mw / Mn: 2.3, acid value: 24 mgKOH / g).

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
softening pointaaaaaaaaaa
softening pointaaaaaaaaaa
softening pointaaaaaaaaaa
Login to View More

Abstract

A toner comprising at least a binder resin, a colorant and a release agent, wherein the binder resin contains: a polyester resin A obtained by polycondensation of an aromatic dicarboxylic acid, a rosin and an alcohol having three or more hydroxyl groups, a content of the rosin being 60% by weight or more; and a polyester resin B obtained by polycondensation of an aromatic dicarboxylic acid, a rosin and a polyhydric alcohol, a content of the rosin being 5 to 60% by weight, wherein 50 to 200 parts by weight of the polyester resin B is contained with respect to 100 parts by weight of the polyester resin A.

Description

technical field [0001] The present invention relates to a toner and a method for producing the same. Background technique [0002] Toners for developing latent images are used in various image forming methods. For example, it is used in an electrophotographic image forming method. [0003] In general, an image forming apparatus using an electrophotographic image forming method forms a desired image on a recording medium through the following steps: a charging step of uniformly charging a photosensitive layer on the surface of a photosensitive drum serving as a latent image carrier; an exposing step of projecting signal light onto the surface of the photoreceptor drum in a charged state to form an electrostatic latent image; a developing step of developing the electrostatic latent image by supplying toner for electrophotography to the electrostatic latent image on the surface of the photoreceptor drum; A transfer step in which the toner image on the surface of the photorece...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087
CPCG03G9/08797G03G9/08755G03G9/08795G03G9/08775
Inventor 有好智
Owner SHARP KK
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com