Toner and method for manufacturing the toner, two-component developer, developing device and image forming apparatus

A technology of toner and colorant, applied in the field of toner, can solve the problems of inability to obtain low-temperature fixation and high-temperature stain resistance, uneven dispersion state of crystalline resin, and lower limit temperature of adhesive resin fixation, etc. Achieves the effects of excellent fixability and storage stability, excellent narrow melting point and durability, and excellent low-temperature fixability

Inactive Publication Date: 2009-06-03
SHARP KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In the techniques disclosed in Japanese Patent Laid-Open No. 2001-22123 and Japanese Patent Laid-Open No. 2004-184444, it is difficult to make polylactic acid in Evenly dispersed in toner
When polylactic acid is unevenly dispersed in the toner, it may not only cause unevenness in particle size distribution due to deviation in pulverization of the toner, influence on fixability due to unevenness in melt viscosity, and composition of resins. Variations in chargeability caused by variations in the physical properties of the toner particles, as well as unevenness and deterioration in light transmittance
[0014] In addition, the technology disclosed in Japanese Patent Application Laid-Open No. 2002-72567 utilizes the sharp melt of crystalline resins, and lowers the fixing minimum temperature of the binder resin without lowering the glass transition temperature, so that Low-temperature fixability is improved, but sufficient low-temperature fixability and high-temperature offset resistance cannot be obtained, and good storage stability cannot be obtained
In addition, when fixing on media such as paper or OHP sheets, when the crystalline resin solidifies after melting and recrystallizes, the dispersion state of the crystalline resin becomes uneven, and the light transmittance may vary.

Method used

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  • Toner and method for manufacturing the toner, two-component developer, developing device and image forming apparatus
  • Toner and method for manufacturing the toner, two-component developer, developing device and image forming apparatus
  • Toner and method for manufacturing the toner, two-component developer, developing device and image forming apparatus

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0190] [Pre-mixing process]

[0191] Polyester resin A (glass transition temperature (Tg): 60° C., softening temperature (Tg) 1 / 2 ): 110°C, peak molecular weight 12500, Mw / Mn=5.2, acid value 16, THF insoluble content 0%) 81.5% by weight (90.0 parts by weight) and polylactic acid resin A (trade name: Teramac TE-2000C, Unichika Co., Ltd. Co., Ltd., melting point (Tm): 170°C) 9.0% by weight (10.0 parts by weight), KET.BLUE111 (trade name: Copper Phthalocyanine 15:3, manufactured by Clariant Co., Ltd.) as a colorant 5.0% by weight (5.5 parts by weight) , 3.0% by weight (3.3 parts by weight) of paraffin wax (trade name: HNP-10, manufactured by Nippon Seika Co., Ltd., melting point (Tm): 75°C) as a release agent, and a charge control agent (trade name: Copy Charge N4P VP 2481, manufactured by Clariant Japan Co., Ltd.) 1.5% by weight (1.7 parts by weight) of toner raw materials were mixed with a Henschel mixer (trade name: FM20C, manufactured by Mitsui Mining Co., Ltd.) for 3 minute...

Embodiment 2

[0200] In the pre-mixing process, 72.4% by weight (80.0 parts by weight) of the main component polyester resin A and 18.1% by weight (20.0 parts by weight) of polylactic acid resin A were used as the binder resin (100 parts by weight), and in addition, The same operation as in Example 1 was carried out to manufacture 16.0 kg of the toner of Example 2.

[0201] The value of the elastic loss modulus G" at 120°C of the obtained toner particles was 7.8×10 4 Pa, the value of elastic loss modulus G" at 200°C is 3.2×10 2 Pa, the value of the loss tangent (tan δ) at 200°C was 3.2. And the elastic loss modulus G" of the toner particles at a frequency of 1 Hz reaches 10 3 The temperature of Pa is 164°C, and the melting point (Tm) of the polylactic acid resin A is 6°C higher than that. In addition, the obtained toner had a volume average particle diameter of 6.8 μm and a coefficient of variation (CV value) of 25%.

Embodiment 3

[0203] [production of polylactic acid resin B]

[0204] 47.5 kg of L-lactide and 2.5 kg of D-lactide were put into the polymerization reaction layer, heated and melted while stirring under a nitrogen atmosphere, and mixed uniformly. Next, after adding 15 g of tin octoate, heat to 190° C. until the viscosity of the reactant increases, and then perform heating ring-opening polymerization for 3 hours to produce polylactic acid resin B (weight average molecular weight (Mw): 12000, Mw / Mn= 2.7, melting point (Tm): 129° C., molar ratio of D-lactic acid unit to L-lactic acid unit: 0.085).

[0205] [production of toner]

[0206] In the pre-mixing process, in addition to using 54.3% by weight (60.0 parts by weight) of the main component polyester resin A and 36.2% by weight (40.0 parts by weight) of polylactic acid resin B as the binder resin (100 parts by weight), and In the same manner as in Example 1, 14.1 kg of the toner of Example 3 was produced.

[0207] The value of the elasti...

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Abstract

A toner which takes into account preservation of the global environment and which is excellent in fixability and storage stability and moreover, good in light transmittance and a method for manufacturing the toner, a two-compartment developer, a developing device and an image forming apparatus are provided. In toner including at least a binder resin and a colorant, the binder resin includes a resin which is a major component and a biomass-containing crystalline resin; and the crystalline resin is contained in an amount of 1 part by weight or more and 50 parts by weight or less based on 100 parts by weight of the binder resin, and a melting point of the crystalline resin is higher by a temperature of from 5 DEG C. to 10 DEG C. than a temperature at which a loss modulus G'' of the toner at a frequency of 1 Hz is 103 Pa.

Description

technical field [0001] The present invention relates to a toner, a method for producing the same, a two-component developer, a developing device, and an image forming device. Background technique [0002] A toner for developing a latent image can be used in various image forming processes, and as one example, it is known that it can be used in an electrophotographic image forming process. [0003] In an image forming apparatus using an electrophotographic image forming process, the following steps are generally performed to form a desired image on a medium: a charging step of uniformly charging the photosensitive layer on the surface of the photosensitive drum as a latent image carrier; The exposure process of projecting the signal light of the original image on the surface of the photoreceptor drum in a charged state to form an electrostatic latent image; the development process of supplying electrophotographic toner to the electrostatic latent image on the surface of the p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G9/08G03G15/08G03G15/20G03G15/01
CPCG03G9/08797G03G9/08795G03G9/081G03G9/08757
Inventor 有好智久保雅彦赤泽良彰
Owner SHARP KK
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