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Black toner and image forming method

A technology of toner images and toners, which is applied in the field of full-color image formation, and can solve problems such as colorant color tone and density design fixing temperature region that have not been found yet

Inactive Publication Date: 2007-05-30
CANON KK
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] For light-colored toners, it has not been found that the most suitable colorant for light-colored toners is the color tone and density design, and the type and amount of wax to improve graininess (roughness) in low-density areas in images and to fixation. The influence of the expansion of the temperature zone

Method used

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  • Black toner and image forming method

Examples

Experimental program
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Effect test

preparation example Construction

[0128] In the production methods of (1) to (5) above, a plurality of polymer units having different molecular weights and degrees of crosslinking can be used for the vinyl copolymer unit and the polyester unit.

[0129] Among the binder resins contained in the toner of the present invention, in addition to the mixture of the above-mentioned polyester resin and vinyl copolymer, the mixture of the above-mentioned hybrid resin and vinyl copolymer, and the above-mentioned polyester resin and the above-mentioned hybrid resin, Mixtures of vinyl copolymers may also be used.

[0130] The cyan toner of the present invention may also contain a charge control agent. Known substances can be used as the charge control agent. In particular, colorless and cyan toners are preferably metal compounds of aromatic carboxylic acids that have a high triboelectric charging speed and can stably maintain a constant charge.

[0131] Examples of negative charge control agents include salicylic acid me...

Embodiment 1

[0327] (first kneading process)

[0328] 70 parts by mass of polyester resin (I)

[0329] ・75 parts by mass of paste colorant containing C.I. Pigment Blue 15:3 and C.I. Pigment Green 7 (30 parts by mass as a colorant)

[0330] The above-mentioned raw materials are first added to a kneading type mixer according to the above-mentioned formula, and while mixing, make it heat up under non-pressurized conditions. When the highest temperature is reached (it must be determined by the boiling point of the solvent in the paste. At this time, it is about 90-100 ° C), the pigment in the water phase is distributed or moved into the molten resin phase, and after confirmation, it is heated and melted and kneaded 30 minutes to allow the colorant in the paste to fully move. Then, stop the kneader, drain the hot water, then raise the temperature to 130°C, heat, melt and knead for about 30 minutes, distill off the water while dispersing the colorant, cool it, and take out the first kneaded mi...

Embodiment 2

[0365] Cyan toner a was prepared in substantially the same manner as in Example 1, except that the wax dispersant masterbatch composed of wax (F) and wax dispersion medium (II) was used instead of the wax dispersant (I) masterbatch. -2, to obtain cyan developer a-2. Cyan developer a-2 was evaluated in the same manner as in Example 1. As shown in Table 7, the low-temperature fixability of the cyan developer a-2 was better than that of Example 1, and although some deficiencies were found in the high-temperature offset resistance, it was still within a sufficiently practical range.

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Abstract

The present invention provides a cyan toner including: one or plural heat-absorption peaks in a temperature range of 30 to 200 DEG C in a heat-absorption curve obtained by using a differential scanning calorimeter; a maximal value of a maximum heat-absorption peak temperature in the range of 65 to 105 DEG C; and a reflectance of 45 to 80% at a wavelength of 500 nm, a reflectance of 5 to 30% at a wavelength of 600 nm, and a brightness L* of 45 to 75, when measured in a powder form by spectroscopic analysis. The present invention thus provides a cyan toner capable of forming an image with reduced graininess and roughness from a low-density region to a high-density region and ensured a sufficient fixing temperature region.

Description

technical field [0001] The present invention relates to a cyan toner used for developing an electrostatic image in an image forming method such as electrophotography or electrostatic printing, or a cyan toner used for forming a toner image in an image forming method of an inkjet system A toner, an image forming method using the cyan toner, and a full-color image forming method using the cyan toner. In particular, the present invention relates to a cyan toner used in a fixing method of applying heat and pressure to fix these toners to a transfer material such as printing paper, an image forming method using the cyan toner, and A full-color image forming method using the cyan toner. Background technique [0002] With the wide spread of electrophotographic color image forming apparatuses, their uses have become diverse, and the requirements for image quality have become more stringent. In the copying or printing of general photographs, catalogs, maps and other images, down to...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G03G9/09G03G9/08G03G15/20G03G15/16G03G9/087G03G9/097G03G15/01
CPCG03G9/08782G03G9/08786G03G9/09G03G9/0821G03G13/01G03G15/0115
Inventor 板仓隆行马场善信佐藤祐弘菅原庸好寺内和男上泷隆晃谷川博英
Owner CANON KK
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