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Toner for forming electrostatic image, development agent, image forming apparatus, and image forming method

An electrostatic image and toner technology, applied in the direction of developer, electric recording process using charge pattern, electric recording process using charge pattern, etc., can solve the problem of insufficient technology, caking resistance, and bad influence on image stability , Instable crystal structure and other problems, to achieve the effect of improving image hardness, excellent scratch resistance, and suppressing bad conditions

Inactive Publication Date: 2014-03-26
RICOH KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in order to obtain good blocking resistance while maintaining low-temperature fixing properties, the above-mentioned technology is not yet sufficient.
[0011] In addition, in order to solve this problem, a method focusing on crystalline resins has also been proposed (see Patent Document 7), but it is easily affected by external conditions (heat history during production, storage, and fixing, or partial phase mixing, etc.), The crystal structure is unstable, so there is a problem that it has a bad influence on various characteristics of the toner, blocking resistance, image stability, etc.

Method used

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  • Toner for forming electrostatic image, development agent, image forming apparatus, and image forming method
  • Toner for forming electrostatic image, development agent, image forming apparatus, and image forming method
  • Toner for forming electrostatic image, development agent, image forming apparatus, and image forming method

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Embodiment

[0205] Hereinafter, although an Example and a comparative example are shown and this invention is demonstrated more concretely, this invention is not limited to these Examples. "Parts" in the description are "parts by weight", and "%" with respect to the amount of materials is "% by weight".

Synthetic example 1

[0206] Synthesis Example 1: Synthesis of Block Copolymer A-1

[0207] Into a 500 mL four-necked flask, 212 g of L-lactide (lactide), 38 g of D-lactide (weight ratio, L body / D body = 85 / 15), and 107 g of the crystalline compound of Synthesis Example 2 described later were added. After polyester A2-1 was dried at 40°C for 5 hours, the internal temperature was gradually raised to 150°C, and after visually confirming that the reaction system was uniform, 50 mg of tin 2-ethylhexanoate was added to conduct a polymerization reaction. At this time, the temperature inside the system was controlled not to exceed 190°C. After 2 hours of reaction time, the system was cooled to 175° C., and the lactide was removed under the condition of 10 mmHg for 60 minutes to complete the polymerization reaction and obtain block copolymer A-1. The resin had a weight-average molecular weight Mw of 31,000 and a melting point of 51°C.

Synthetic example 2

[0208] Synthesis Example 2: Synthesis of Crystalline Polyester A2-1

[0209] Add 1,6-hexanediol and adipic acid at a ratio of OH / COOH=1.15 to a 5L four-necked flask equipped with a heated and dried nitrogen inlet tube, a dehydration tube, a stirrer, and a thermocouple, and 300 ppm tetraiso Titanium propoxide was reacted under normal pressure at 200 to 230° C. for 10 hours, and further reacted under reduced pressure of 10 mmHg or less for 5 hours to obtain crystalline polyester A2-1. The resin had a melting point of 55°C.

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Abstract

The invention relates to a toner for forming electrostatic image, a development agent, an image forming apparatus, and an image forming method. Toner contains a binder resin, wherein the binder resin contains a block copolymer A containing a crystalline segment X and a non-crystalline segment Y, wherein the toner has a thermo-mechanical analysis (TMA) compressive deformation amount (TMA %) of 10% or less at 50 DEG C. and a relative humidity of 90%, wherein the toner has a spin-spin relaxation time (t130) of 10 ms or greater at 130 DEG C. as measured by pulse nuclear magnetic resonance (NMR), wherein the toner has a spin-spin relaxation time (t'70) of 1 ms or less at 70 DEG C. as measured by pulse NMR when descending from 130 DEG C. to 70 DEG C. The toner is excellent in low-temperature developing properties and resistance to agglomeration.

Description

technical field [0001] The present invention relates to a toner for developing an electrostatic charge image suitable for use in electrophotographic image forming apparatuses such as copiers, printers, and FAXs, a developer using the toner, an image forming apparatus, and an image forming method. Background technique [0002] Due to the recent prosperity of environmentally-conscious products, etc., a technology of fixing toner with low energy using raw materials derived from plants is desired. [0003] As a means of using resins derived from plants as materials for toners, there are examples of aliphatic polyesters produced by microorganisms that are biodegradable to binder resins (for example, Patent Document 1). However, if this Polyester has a high softening temperature of the toner, so it is necessary to set a high fixing temperature, which is inappropriate from the viewpoint of energy saving. [0004] As a method of lowering the fixing temperature, a method of adding a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G9/087G03G15/00
CPCG03G9/0821G03G9/08788G03G9/08797G03G9/08755G03G13/22
Inventor 朝比奈大辅山下裕士杉本强根本太一山内祥敬关口圣之千叶晋
Owner RICOH KK
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