JPH01206357A - Electrophotographic photoreceptor - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an electrophotographic photoreceptor, and more particularly to a laminated electrophotographic photoreceptor having a rough surface.

Generally, electrophotographic photoreceptors in which a charge generation layer made of an organic pigment, a charge transport layer made of a charge transport material, and a binder are provided on a support have a film thickness of about 30 μm or less,
Many charge generation layers have a thickness of 1 μm or less. It is therefore clear that the surface roughness of the support influences the surface condition of these layers. For example, when the height of the unevenness on the support surface is 1.5 μm or more or the average interval between the unevenness is 40 μm or more, white streaks occur in the halftone image. If the maximum height of the unevenness on the surface of the support is less than 0.3 μm, white streaks will not occur, but this will lead to a decrease in productivity, such as an increase in the number of steps and a longer cutting time.

(2) An object of the present invention is to provide a laminated electrophotographic photoreceptor that does not generate white streaks, has good adhesion between a photosensitive layer and a support, and has improved productivity.

(2) As a result of intensive research to achieve the above object, the present inventors have developed a multilayer electronic device in which a charge generation layer and a charge transport layer are provided on a support with a rough surface, either directly or through an intermediate layer. In the photographic photoreceptor, the support has a rough surface with spiral irregularities, and the spiral irregularities have a peak height of 0.3 μm to 1.5 μm, and a measured length. The average spacing S m of unevenness (S m = L/n), which is expressed as the value obtained by dividing L by the number n of peaks of unevenness, is 5 to 40μ.
It has been found that the above object can be achieved by providing a laminated electrophotographic photoreceptor characterized by m.

FIG. 1 is a schematic diagram showing a part of a cross section of a laminated electrophotographic photoreceptor of the present invention.

In the electrophotographic photoreceptor of the present invention, a charge generation layer 2 is coated on a support 1 having a specific rough surface, if necessary, via an intermediate layer, and a charge transport layer 3 is further coated thereon. It has a laminated structure.

The charge generation layer 2 contains an organic pigment such as a disazo pigment, and has a thickness of preferably 0.01 to 5 μm, more preferably 0.05 to 2 μm.

The charge transport layer 3 is made of a combination of a charge transport substance and a binder, and preferably has a thickness of 3 to 50 microns, more preferably 5 to 20 microns.

As a support with a rough surface, a metal plate made of aluminum, copper, zinc, etc., a plastic sheet or plastic film made of polyester, etc., on which a conductive material such as aluminum or SnO2 is vapor-deposited, or paper treated with conductivity is used. .

However, all of the supports have spiral irregularities on the surface, and the height of the irregularities ranges from 0°3 μm to 1.5 μm.
m, the measurement length L, the number of peaks n, and the average spacing S of unevenness.
It is an essential requirement that m (S m = L/n) be 5 to 40 μm. When the height of the uneven peaks is 1.5 μm or more or the average spacing Sm of the unevenness is 40 μm or more,
White streaks appear in halftone images. If the height of the ridges of the unevenness is less than 0.3 μm, white streaks will not occur, but the number of steps will increase, the cutting time will become longer, and productivity will decrease.

EXAMPLES Hereinafter, the present invention will be explained in more detail with reference to the following examples, but the present invention is not limited thereto.

An aluminum cylinder of 80φ×340nn was used as the support in the example.

This aluminum cylinder was cut to form a support having an uneven shape as shown in Table 1 below. Note that a small plate type surface roughness meter (stylus type) was used to measure the uneven shape.

Table / These supports are made of alcohol-soluble copolymerized nylon (
Toshi: CM8000) was applied by dip coating in a solution of a mixed solvent of methanol and butanol to form a 0.3 μm intermediate layer.

Next, 22 parts of the disazo pigment represented by the formula and 418 parts of cyclohexanone are dispersed in a ball mill, and the resulting millbase is diluted with 1760 parts of cyclohexanone. The solution thus prepared was applied by dipping onto each of the aluminum cylinders on which the intermediate layer had been formed, to form a charge generation layer with a thickness of 0.2 μm.

Next, 225 parts of a charge transport substance represented by the formula, 225 parts of polycarbonate resin (Teijin Panlite: manufactured by Teijin), and 3,5
A charge transport solution was prepared by dissolving 41 parts of -di-t-butyl-hydroxytoluene in 2050 parts of methylene chloride. This solution was dip coated onto the charge generation layer and dried with hot air at 110°C. The film thickness was 22 μm.

Samples A, B, C, and D obtained in this way were installed in an electrophotographic copying machine configured to include corona charging, image exposure, dry toner phenomenon, toner transfer to plain paper, and a cleaning process using a urethane rubber blade. A halftone image was obtained using colored drawing paper as a manuscript.

When Sample D was used, numerous white streaks were clearly observed in the image, but when Samples A, B, and C were used, no white streaks were observed at all. For example, it is possible to obtain a halftone image without white streaks without increasing the number of steps in processing the support, and with the spiral unevenness intact.

[Brief explanation of the drawing]

FIG. 1 is an explanatory view showing a part of the cross section of the electrophotographic photoreceptor of the present invention. 1...Support 2...Charge generation layer 3...Charge transport layer

Claims (1)

[Claims] 1. In a laminated electrophotographic photoreceptor in which a charge generation layer and a charge transport layer are provided directly or via an intermediate layer on a support having a rough surface, the support has a spirally uneven surface. The spiral unevenness has a peak height of 0.3 μm to 1.5 μm, and the unevenness is calculated by dividing the measurement length L by the number n of the uneven peaks. Average spacing Sm (Sm=L/n) is 5 to 40 μm
A laminated electrophotographic photoreceptor characterized by: