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Toner

A technology of toner and colorant, applied in the field of toner

Active Publication Date: 2009-06-10
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in recent high-speed image forming apparatuses, such a branch structure is not considered to be optimal, and a branch structure that can obtain fixing performance in a wider temperature range has to be newly proposed

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0271] Hereinafter, the present invention will be further illustrated by examples, but the present invention is not limited by these examples at all.

[0272] Production Example of Adhesive Resin

manufacture Embodiment 1

[0274] Mix the polyester monomers in the following proportions:

[0275] Bisphenol derivative represented by formula (A)

[0276] (R: propylene, the average value of x+y is 2.2) 1.150mol

[0277] Terephthalic acid 0.430mol

[0278] Isophthalic acid 0.390mol

[0279] Fumaric acid 0.010mol

[0280] Dodecenylsuccinic anhydride 0.170mol

[0281] 0.1% by mass of tetrabutyl titanate as a catalyst was added thereto, and polycondensation was performed at 220°C to obtain unsaturated polyester resin P-1 (Tg=58°C, main peak molecular weight=7800, number average molecular weight (Mn) =4600, Mw / Mn=2.1, acid value=5mgKOH / g, hydroxyl value=37mgKOH / g).

manufacture Embodiment 2

[0283] Except mixing polyester monomers in the following proportions, prepare in the same manner as polyester resin production example 1 to obtain unsaturated polyester resin P-2 (Tg=59°C, main peak molecular weight=6400, number average molecular weight ( Mn)=3900, Mw / Mn=2.8, acid value=11mgKOH / g, hydroxyl value=56mgKOH / g):

[0284] Bisphenol derivative represented by formula (A)

[0285] (R: propylene, the average value of x+y is 2.2) 1.150mol

[0286] Terephthalic acid 0.430mol

[0287] Isophthalic acid 0.370mol

[0288] Fumaric acid 0.040mol

[0289] Dodecenylsuccinic anhydride 0.160mol

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PUM

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Abstract

The invention is to provide a toner excellent in fixing property, high-temperature offset resistance and blocking resistance, and having an excellent developing property. The invention provides a toner including at least a binder resin and a colorant, wherein: the binder resin contains a hybrid resin which contains a polyester-type resin unit by 50 mass% or more and in which a polyester-type resin component and a vinyl-type resin component are chemically bonded; the toner contains 3 to 50 mass% of a tetrahydrofuran-insoluble matter derived from the binder resin; the tetrahydrofuran-insoluble matter contains a hybrid resin; and a tetrahydrofuran-soluble matter, obtained by hydrolyzing the tetrahydrofuran-insoluble matter and separating by filtration, has, in a GPC-measured molecular weight distribution, a main peak within a molecular weight range of 50,000 to 500,000.

Description

technical field [0001] The present invention relates to a toner used in an image forming method such as an electrophotography method, an electrostatic recording method, or a toner jetting method. Background technique [0002] As the binder resin used for the toner, polycondensation resins such as polyester resins and vinyl-based resins such as styrene-based resins are mainly used. Polyester resin has the advantage of good fixing performance, but is difficult to make with high molecular weight, and has the disadvantage of easily causing offset phenomenon at high temperature. [0003] However, in order to avoid such disadvantages, when a crosslinking component is added to the polyester resin to increase the melt viscosity of the resin and improve the high-temperature offset resistance, it not only leads to poor fixing performance, but also causes problems during toner processing. Pulverization performance deteriorates. [0004] On the other hand, since high molecular weight ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/08
Inventor 小川吉宽长谷川雄介佐野智久西山淳子冈崎美穗粕谷贵重西川浩司
Owner CANON KK