JPS5986061A - Electroprinting toner - Google Patents

Abstract

PURPOSE:To make is possible to use the same toner both for forming an electroprinting master and for making a copy print using this master by incorporating carbon black together with a charge control substance having charge retentivity at a specified value or higher in a binder resin. CONSTITUTION:A toner is prepared by incorporating in a binder resin carbon black together with a charge control substance, such as various kinds of nigrosine dyes, quternary ammonium salt, or pyridinium salt pigment as a positive type charge controller, or chromium complex salt of azo dye or copper phthalocyanine pigment as a negative type charge controller, so as to keep charge retentivity to >=50% in accordance with the charging polarity to be used. This toner is used for forming a fixed image of an electroprinting master, and also used as a toner in the processes of uniformly charging and uniformly exposing this master, developing, transferring, and fixing it to make a copy. As a result, the obtained toner can maintain good the charge retentivity of the image on the master and form a copy image of good quality.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is directed to improving the density of toner particles used in electronic printing devices that apply the principles of electrophotographic copying, particularly in the toner and image areas of printing masters. The present invention relates to a toner for electronic printing that can be used for electronic printing.

'Printing by electrophotography has been known for a long time. For example, the zero printing method in U.S. Pat. No. 8,257,6047, or the
There are No. 4 electronic stamp i:p+1 devices, etc.

This is done by forming a powder image on a photoconductive plate using an electrostatic photographic method, fusing or fixing the powder to form a non-photosensitive insulating image, that is, a printing master, on the photoconductive plate. After forming and then uniformly (tF t) this printing master,
By uniformly irradiating #S, the time is maintained on the non-photosensitive tile area of the r)'FIL load, and the discharge is caused in the photosensitive non-gap area, and the 'J Is it possible to apply powder to the powder? This is a method in which the powder image is transferred onto a suitable powder support, and the above steps are repeated. In this 'electronic printing method, there are two development steps, namely, one development process at the time of master creation, and one development process at the time of master creation. It requires the slag and Mj, the present 1 & at the time of copy printing, and these 2 times the present 1 &
It is preferable to use a virtual machine to create the master and copy printed matter using approximately one set of toner.

The present invention was made in view of the above problems, and provides a W4i child printing toner 2 having high charge retention properties, and an electronic printing method in which master creation and copy print creation can be performed using the same toner. The purpose is to provide toner for

According to the studies of the present inventors, in the electronic printing method described above, the quality of the image of the final printed matter, especially the sulfuricity of the printing master having toner was found to have a significant influence.

Copy printing process after forming the print master (as mentioned above, the print master with one toner image is uniformly charged and uniformly exposed to hold the charge only on the toner one image part on the print master, and then the print master is formed) If the charge retention of the toner on the print master is low, the density of both f-elements of the copy will be low. High charge retention requires the use of insulating toners and - sufficiently pigmented to prevent light during image exposure from reaching the photosensitive layer of the printing master. It is thought that this can be achieved by using toner, but in preliminary experiments conducted by the present inventor, high 11L load retention could not be achieved even with highly insulating and darkly colored toner: That is, Conventional dry two-component development (used in family methods) A printing master is created in which a colorant is dispersed in a binder resin and one toner is formed using a black toner with an electric resistance of 1016 Ω or more. However, the charge retention was not sufficient, and even if copies were made, only those with a low degree of charge could be obtained.

The present inventor has further studied and, in order to achieve the above-mentioned object of the present invention, the printing master is characterized in that the binder resin contains a charge control substance that has a charge retention rate of 50 cm or more. It has been found that this can be achieved by a toner that has the following properties. here,
゛Charge retention rate is defined as follows. First, one particle size is 1μ.
The finely pulverized control substance powder is statically and uniformly deposited on the printing master. Perform the corona diode on top of this, and set the current ff'l [, 'coron 1' to be vl.0 On the other hand, set the potential of the printing master's original diode to V. When it is closed, ■□/VoX 100 is the old load retention rate.

Such ':rFton control substances include various nigrosine dyes, quaternary ammonia A! , amines, pyridinium salts, picolinium salts, giltstone, etc., and for negative charging, chromium complex salts of azo dyes, copper phthalocyanine pigments, etc. can be selected.

The toner 1''j of the present invention is mainly composed of carbon black, a resin component, and the above-mentioned charge control substance.Charge control substance No. 1 (0.2 to 20
It is desirable that it be within the range of

F as the carbon black used in the toner of the present invention
For example, commercially available products include 2400B manufactured by Mitsubishi Kasei and Ill MO'VARCH1300 manufactured by Cahot Co., Ltd. in the United States.

BP1300, Rave manufactured by Columbia Carbon Company, USA
n8000 (poorness black), and ROYAL 5PECTRA manufactured by Columbia Carbon Company in the United States.
, NEO3PECTRA MARK I , NEO
5PECTRA MARK If, NEO3PECTR
A AG% 5UPER5PECTRA, etc., Co1our Black FW4200 manufactured by West German Degussa, C
o1our BlackFW2, 5special
Black 6, 5special Black
5.

5special Black 4, Pr1ntex U
etc. (hereinafter referred to as Chaol Black), etc. can be used.

As the resin component, natural and synthetic resins conventionally known to those skilled in the art can be used alone or in combination. That is,
Substituted or unsubstituted styrene.

Vinyl-based homopolymers or copolymers such as acrylic acid, methacrylic acid or their fatty acid esters, unsaturated olefin-based polymers and copolymers such as styrene and glopyrene, and/or their rogens. Resins made of homopolymer or copolymer, polyamide, condensation polymer such as polyester, etc. can be selected according to special requests. Furthermore, dyes and pigments for eight-tone adjustment can be added.

Toner is usually made by mixing these raw materials by melting and drying.

It can be obtained as fine powder particles with a particle size of 10 to 15 microns by removing the coarse powder and pulverizing it, but it can also be obtained by other known methods, such as the spray drying method and the suspension granulation method. can. In addition, classification is performed as necessary, and a flow aid is added to the toner surface.

For example, it is also possible to attach fine powder/liquid to He.

The toner thus obtained usually has a particle size of 50 to 10
It is mixed with Φ Yaria, which is a magnetically sensitive particle of 0.009 chlorine, in an appropriate ratio to prepare a current brazing material. Although general magnetically sensitive particles (iron powder, ferrite powder, nickel powder) are used, an organic 61 molecular layer may be provided on the surface of the particles.

Using the printing master formed in this manner, printing of multiple sheets of paper is carried out in the following manner. Photosensitive paper - The printing master with two toner particles is charged with a charger 4, and then uniformly exposed with a uniform exposure plate 13.
be illuminated. The charge on the uniformly charged photosensitive paper 10 is uniformly discharged by the insensitive and non-conducting toner layer jXls, leaving only the toner particles jXls.Therefore, only the toner residue portion is One printing master is formed with L loads and is visualized by the developing machine 5.Then one transfer paper 11 is sent to the transfer section in synchronization with the rotation of the rotating drum 10 times and printed by the transfer corotro/6. The toner image on the master is transferred to a transfer paper, which is further fixed by a fixing device 9, and guided to a paper discharge tray to obtain a copy.

On the other hand, the residual toner on the print master after transfer is cleaned by the cleaning device 8, and -th printing cycle is completed. After that, the printing cycle will be returned for the number of copies that are considered a must-have.

Here, as the photosensitive paper 10, acid f-arsenic lead paper is advantageous because of its low cost, and as the fixing device 7, a fixed fixing device is effective.

An example of a sulfur printing apparatus using the toner of the present invention is shown in FIG.

Reference numeral 1 denotes a rotating drum, which has a presser claw on its circumferential surface, and a photosensitive paper 1
Support 0? It looks like it's going to be j.

Surrounding the rotating drum 1, there are (・engineering, cleaning nog device 178, strip 'il\, ?!', v 4, uniform dew) Y11 rug 13 + elephant) R5, transfer corotron 6, photosensitive paper 10 A fixing device 78 for fixing the powder toner image is provided.

The process of creating a print master is as follows: After the paper 10 is wrapped around the rotating drum 1 and supported, the band 1 is charged with a charger 4, and then the original AjQ on the document table 3 illuminated by the document illumination rung 14.
is projected onto the photosensitive paper 10 through two projection lenses to form an electrostatic latent image. The image is fused and fixed onto photosensitive paper 10" to form a print master.

When the toner of the present invention is used to create a printing master, a sufficiently high potential is maintained during the copying/printing process of one toner image after heat fixation, and a high degree of image blurring can be obtained during copying/printing. The reason for this is not necessarily obvious, but with conventional toner, the toner on the print master does not have sufficient tit load retention (because it is heat-fixed, there is no charge at the contact point between the toner and the master paper). The cause of this is thought to be charge injection from the charge control substance contained in the toner to the master.On the other hand, in toners that do not contain charge control substances at all, friction ii) The electric characteristics are indeterminate, and it is possible to obtain a continuously high printing density.On the other hand,
In the toner of the present invention, charge injection from the 11L control substance to the master is negligibly small, and the triboelectric charging properties are stable, making it easy to create masters suitable for electronic printing processes and for copy printing. It is thought that the toner is compatible.

Hereinafter, the present invention will be explained with reference to Examples and Comparative Examples.

Here, commercially available oxidized [1] lead paper was used as a photosensitive paper, an I Effrante fixing device was used as a fixing device for creating a master, and a T Ehito roll fixing device was used to fix the toner on the transfer paper.

Example 1 A toner having the same composition was obtained by a conventional kneading and crushing method.

Styrene/n-butyl methacrylate copolymer (1 (6 product names Sanyo Kasei SBM73 (1) 92 overlapped parts Co
1our Black FW200 (Dedazasha 4.
．． l< ) 5 #Nida 1 Koshin Dye Fu 17 no? NT II N-fl 3
2. Take this toner with A.

Example 2 Styrene/n-butyl methacrylate combination 89 parts by weight Co1our Black FW200 6
Weight part Giltonite (Gilnonite Co., Ltd.) 51 This toner is designated as B.

Comparative example 1 Styrene/n-butyl methacrylate copolymer 92 heavy oil part Co1our Black FW200 6
'Nigeron/Dye Pontron N-01 (O1J-
11-ent chemistry) The double stitched part is C and '1'.

Comparative Example 2 Styrene/n-butyl methacrylate co-claw combination 92 layers Co1our Black FW200
6' Quaternary ammonium salt Cyastat LS
(American Cyamide Company) 2 Electrical sewing part (this) J-Itata D.

These toner samples #+ have a critical ratio of 3 to the carrier iron powder:
The mixture was thoroughly mixed at a ratio of 1000% and used as a current ironing agent to create a printing master. This printing mask was copied using the same carrier and the following toner composition, L
IJ printing is done.

Composition of printing toner: Styrene-2-ethylhexyl acrylate co-isolated Product name: Glyolite AC, made by Gutdewyer Co., Ltd.
-L) 92 claw part carbon bra, ri
6 to Glo// Bondroa N-0321 Toner for copying and printing like this (toner density 3)
When the printing masters prepared in the Comparative Example and the -μ Example and the T toner samples A to D were copied and printed, the results shown in Table 1 were obtained. Here, the image θJ1' [is the image (4 degrees 0.7 g) (solid black image [elephant]) is reproduced to the mastert 1 & the heat-fixed image on the light body to 1.0, and this printing master is uniformly Charged, full surface h\r original back upper i' + 12 Enoki copy, stamp side (printed with elephant agent (elephant 5 paper transfer,
The optical (JA degree) when fixed is the uniform charging of the image on the print master, and the toner defeat IJ after the entire surface is exposed.

From the Examples and Comparative Examples in Table 1, the toners of the present invention (Sample A,
B) It is understood that the material is compatible with the electronic printing process.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of an electronic printing device array using the toner of the present invention. Reference numerals in the figure:

Claims (1)

[Claims] A fixed toner image is formed on a photoreceptor, and the created electronic printing master is uniformly charged and exposed to light, and then imaged, transferred, and fixed to produce copies.Used in the electronic printing method. A toner for electronic printing, characterized in that a binder resin contains a charge control substance having a charge retention rate of 50% or more together with carbon black.