JPS6131477A - Paint for electrophotographic device - Google Patents

Abstract

PURPOSE:To provide the titled paint prepared by dispersing an ozone-decomposing substance in a binder resin, having a reflectance of lower than a specific level, capable of preventing the undesirable effect caused by the intrusion of light or the leaving of a cartridge in light place, decreasing the ozone concentration in a copying machine, and improving the durability of a photo-sensitive material. CONSTITUTION:The objective paint giving a coating layer having a reflectance of <=5% can be prepared by dispersing a substance promoting the decomposition of ozone, e.g. manganese oxide, lead oxide, etc. and a black pigment such as carbon black, etc. in a binder resin (preferably a thermosetting resin). The paint is applied to the circumference of a photo-sensitie material of a copying machine.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Application of the Invention] The present invention relates to a paint for an electrophotographic device that is applied inside an electrophotographic device using a photoconductive photoreceptor.

[Background of the invention]

Conventionally, the Carlson method and the NP method are known as latent image forming processes for electrophotographic devices using photoconductive photoreceptors. In electrophotographic apparatuses using either method, corona discharge is used to charge a photoreceptor and transfer toner on the photoreceptor to paper. However, when corona discharge occurs in the air, ozone is generated, and when copies are made continuously, this ozone oxidizes the surface of the photoreceptor, resulting in a deterioration in the sensitivity of the photoreceptor. A good way to prevent this is to apply substances that promote ozone decomposition near the charger, but paints containing these substances do not have low reflectance, scatter leakage light, etc., and may damage the photoreceptor. However, it had the disadvantage of having an adverse effect on optical memory, etc.

[Purpose of the invention]

The purpose of the present invention is to prevent the photoreceptor from being adversely affected by leakage light or leaving the cartridge in a bright place, reduce ozone inside the device during copying, and improve the durability of the photoreceptor. The goal is to provide the following.

[Summary of the invention]

The paint for electrophotographic equipment according to the present invention is a paint that is applied inside an electrophotographic equipment using a photoconductive photoreceptor, and a substance that decomposes ozone is dispersed in a binder resin so that the reflectance of the coated surface is 5. It is characterized by being less than or equal to H.

This paint is formed by dispersing a substance that promotes ozone decomposition, such as manganese (N) oxide, lead oxide, platinum powder, etc., and a black pigment such as carbon black in a binder resin. If the reflectance of the coated surface is 5q6 or less, light such as leakage light will hardly be reflected or scattered onto the photoreceptor, and even if a photoreceptor with a large optical memory is used, there will be no adverse effect. The binder resin can be used as long as it has good adhesion to the main body of the device and has good powder dispersibility, but especially heat-curable rubber, polyurethane resin, epoxy resin, acrylic-melamine resin, Curable resin is best. Dispersion is performed using roll mills, sol mills, vibration mills, attritors, sand mills,
This may be carried out by a conventional method such as a colloid mill.

The paint obtained as described above is used by being applied inside the electrophotographic apparatus, particularly around the photoreceptor. In particular, this paint is preferably applied to the inside of an image forming cartridge that is removably attachable to the main body of an electrophotographic apparatus.

[Embodiments of the invention]

Example 1 As an ozone decomposition accelerating paint, 100 parts of trilead tetroxide (by weight, the same applies hereinafter) and 70 parts of carbon black were mixed with 80 parts of acrylic resin (trade name Nearcridic A405, manufactured by Dainippon Ink Co., Ltd.) (solid form). 50%), melamine resin (trade name: Super Beckamine L121, manufactured by Dainippon Ink Co., Ltd.)
A coating material was prepared by preparing a solution of 20 parts (solid content: 80 inches) and 100 parts of toluene, and then dispersing in an xf-lumil for 6 hours.

Example 2 100 parts of manganese dioxide and 70 parts of carbon black were mixed with 80 parts of acrylic resin (trade name Niacridic A405, manufactured by Dainippon Ink Co., Ltd.) (solid content 50 inches) and melamine resin (trade name Nis-Perbeckamine L121). , manufactured by Dainippon Ink Co., Ltd.) 20 parts (solid content 60 inches) and toluene 1
00 parts of the solution and then dispersed using a lumen for 6 hours to prepare a paint.

The paints prepared in Examples 1 and 2 were mixed with Canon PCIO/
When the paints applied to the internal plastic parts of the 20 cartridges were used to print 3,000 consecutive images on a Canon PC20 copying machine, the same clear images as the initial images were obtained.

In addition, the deterioration of sensitivity of the photoconductor after 3000 sheets is 20V and 20V respectively at VL ('12 lux 5ec) compared to the initial stage.
The increase was 30V.

Comparative Example 1 As a comparative example, 3
When continuous detection durability was performed for 000 sheets, the image after 3000 sheets was blurred compared to the initial image, and the sensitivity deterioration of the photoreceptor increased by 80V in vL.

This shows that the paints prepared in Examples 1 and 2 promote ozone decomposition.

Comparative Example 2 As Comparative Example 2, a paint was prepared by dispersing only 100 parts of trilead tetroxide over a period of 6 hours in a Ki-Rumill using the same tool as in Example 1. When the paint of Example 1 was applied to an aluminum sheet at 20β, the reflectance was 4x, and when the paint of Comparative Example 2 was similarly applied, the reflectance was 40x.

These two types of paint were applied to the internal plastic and metal parts of a cartridge for Canon PCIO/20, set in Canon PC20, left in an environment of 60001 ux for one week, and subjected to continuous durability of 3000 sheets and measured the potential after durability. did. The photoreceptor using the paint of Example 1 had an increase in VL of 30V, but the photoreceptor using the paint of Comparative Example 2 had an increase of 40V.
This was an increase in V.

〔Effect of the invention〕

As described above, according to the present invention, the black paint that promotes dioscin decomposition is applied inside the cartridge or inside the machine body.
Therefore, the durability of the photoreceptor can be improved, and even if the photoreceptor is left in strong light for a long period of time, deterioration of the photoreceptor due to scattered light such as leakage light can be prevented.

Claims (1)

[Claims] A paint applied to the inside of an electrophotographic device using a photoconductive photoreceptor, characterized in that a substance that decomposes ozone is dispersed in a binder resin, and the reflectance of the coated surface is 5% or less. Paint for photographic equipment.