JPS58102247A - Image forming fine powder - Google Patents

Abstract

PURPOSE:To enable a toner to be easily and perfectly fixed especially to a recording sheet with a flash light by adding a specified cyanine dye in a specified proportion. CONSTITUTION:An image forming fine toner powder contains 5-50wt% cyanine dye represented by the formula shown in the right in which n is 1-3, and X is Br or I. This dye efficiently absorbs the IR light of flash light, and softens the binder resin of the toner rapidly, permitting fixing to be easily and perfectly executed even when a binder resin comparatively high in m.p.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a powder developing agent K11l for electrophotography, and in particular to an image-forming fine powder that is fixed to harmful birds by insects when it is fixed on recording paper. Heat-pressure fixing, pressure fixing, and sticky fixing are known as fixing methods for copiers and laser printers. Among these fixing methods, the fast fixing method allows copying to be performed immediately after turning on the switch (
It has great features such as a waiting time of 0) and no burning out of the recording paper even if it gets jammed in the transfer machine.

The image-forming fine powder (usually called toner) printed on the recording paper absorbs the infrared light of the fludge light, softens due to the heat, and is fixed on the recording paper. Because the amount of energy is relatively small, the resins that make up the image-forming fine powder have traditionally been limited to resins with low softening points.
It consists of the following steps: exposure, development, transfer to recording paper, and fixing. Fixing is the process of melting and softening the image-forming fine powder that makes up the desired image on the recording paper using heat, pressure, flashing, and light, and then making it adhere to and solidify on the recording paper. Material resin, coloring material to produce the desired color, and additives such as a charge control agent are mixed, mixed, crushed, and then classified. The particle size of the image forming fine powder is from several μm to several +11
rn ◎When the fixing process is carried out using light and fluff generated from a medium Senon lamp, etc., the light to heat conversion efficiency of the image forming fine powder is not good, so image forming fine powder using a resin with an extremely low softening temperature is used. The fixation by light becomes insufficient due to the 7-latency, resulting in the image-forming fine powder peeling off from the recording paper.In order to deal with this problem, the present inventors conducted intensive research and arrived at the present invention. I got it.

An object of the present invention is to provide an image-forming fine powder that softens upon irradiation with light and easily fixes on recording paper by using a cyanine dye as a component of the image-forming fine powder.

That is, since the image-forming fine powder containing the cyanine dye having the following structural formula efficiently absorbs light due to fludge, sufficient fixation is achieved by the light due to fludge.

The present invention will be described in detail below. In order to form the acid-forming fine powder, commonly used resins can be used as the basic resin. For example, polystyrene, styrene and acrylate, or methacrylate and O copolymer, Resins such as polyester resins, epoxy resins, and bolioid resins can be used. As cyanine dyes, any of the dyes of theory-1 to 3t based on the above chemical structure K may be used; It is preferable to use hebutamethine cyanine with a wavelength of nm 8, which absorbs a large amount of the thermal energy of light (T) and can absorb a large amount of the thermal energy of light. Also, if necessary, the charge of a metal-containing dye, a fatty acid ester, or a compound containing an amino group can be used. A control agent may be added.＠If the purpose is to produce a black toner, a coloring agent such as carbon plastic vl or nigrosine dyestuff is added.◎For colored toners other than black, quinacridone or tetra-dacine may be added. Coloring materials such as a red coloring material, a steel phthalocyanine-based or triphenylmethane-based blue coloring material, a benzidine-based yellow coloring material, etc. may be used.◎ The amount of cyanine dye added in the toner is 5 to 50% by weight, Preferably, the amount is 20 to 40% by weight. ◎ If the amount of cyanine dye added is more than 5% by weight, the effect of adding the cyanine dye will not be apparent, and when toner is manufactured, it tends to cause flutter and incomplete fixation with light. Also, if it is added in an amount of 50% by weight or more, non-uniform dispersion tends to occur due to crosstalk with the resin during the toner manufacturing process.The toner can be manufactured by conventionally known methods, and the final toner particle size is in the range of 5 to 20 μm. contains 90wt, 1.

After kneading for 90 minutes, the mixture was coarsely pulverized, medium pulverized, and finely pulverized using a jet mill. The pulverized material was classified using a classifier, and the particle size was 5.
A prototype toner of ~20 μm was produced.

A fixing test was carried out using an O-flat, in which a solid black image of 20×40 mIm was printed on electrostatic recording paper using the above toner, and a xenon lamp fixing machine manufactured by Ushio Inc. was used as the fixing lamp. (The setting conditions for the fuser were a capacitor with a capacitance of 160 μF, and the voltage was varied in the range of 1,000 to 2,000 V.)The fixing test was carried out using adhesive tape (Scotch tape (Sumitomo 3M Co., Ltd.) on the surface where the toner was fixed. ))
Apply the tape and press firmly with your fingers. After this, peel off the tape,
The amount of toner adhering to the tape was determined visually, and complete fixation was defined as no toner adhering to the tape ◎) As a result, complete fixation was achieved when the voltage applied to the xenon lamp was 1.20 GV (Comparative Example) The above composition A toner was prototyped and a fixing test was conducted in exactly the same manner as in the example.◎The voltage applied to the xenon lamp was 1 or 2.
00V? was not completely fixed, but was completely fixed at 1,900V or more.◎ According to the present invention, the toner that can be easily fixed by the flushing and fixing method is manufactured because it can efficiently absorb the light energy of the fly V sa and lamp. O can

Claims (1)

[Claims] (1) Image-forming fine powder/body characterized by containing a cyanine dye having the following structural formula) The content of the cyanine dye is 5~! The image-forming fine powder according to claim 1), characterized in that it is treated with sO weight percent.