JPH01230062A - Electrophotographic sensitive material for laser light - Google Patents

Abstract

PURPOSE:To obtain high sensitivity to laser light, more particularly semiconductor laser light by forming the above photosensitive material so as to have a conductive base body and an electrophotographic sensitive layer for laser light which is formed on one face of the base body and contains photoconductive zinc oxide, binder resin and specific sensitizer. CONSTITUTION:This photosensitive material has the conductive base body and the electrophotographic sensitive layer for laser light which is formed on one face of said base body and contains the photoconductive zinc oxide, the binder resin and the sensitizer. The sensitizer consists of at least one member selected from the compds. expressed by formula I and formula II. The conductive base body is selectable from, for example, a metallic sheet, metallic foil, etc. The zinc oxide incorporated into the conductive base body has photoconductivity and is, for example, the fine powder having about 0.3mum grain size. The binder resin incorporated into the photographic sensitive layer contains at least one kind selected from, for example, an acrylic resin, etc., and the binder resin is used in the 10-40% range of the solid content weight by the weight of the zinc oxide. The high sensitivity to the laser light, more particularly the semiconductor laser light is thereby obtd.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to an electrophotographic material for use with laser light, and more specifically, an electrophotographic material having good sensitivity to semiconductor laser light. It is related to.

[Conventional technology]

-i, a zinc oxide (ZnO)-based electrophotographic photosensitive material has photoconductive zinc oxide as a main component on the surface of a conductive substrate,
A photographic photosensitive layer is formed from a photosensitive paint containing a binder and a sensitizer.

Visible light has conventionally been used for photosensitive processing of these electrophotographic photoreceptors, but in time, laser light has come to be used instead of visible light. For example, for laser printers, helium-neon laser light (wavelength: 6
33 nm) was often used.

However, recently, semiconductor laser light (wavelength: 700 to 101000n) has come to be used as laser light.This is because semiconductor laser light (a) can be generated at low cost.

(rl) Direct modulation is possible.

(c) It is possible to downsize the generation irradiation device.

This is because it has advantages such as.

Conventional photosensitive layers, such as zinc oxide photosensitive layers containing rose bengal as a sensitizer, are unsuitable for such semiconductor laser light.

This is because the photosensitive layer has maximum sensitivity to light with a wavelength of around 560 nm, but has extremely low sensitivity to semiconductor laser light.

In view of the above circumstances, there is a strong desire for the emergence of an electrophotographic photoreceptor that exhibits maximum sensitivity in the range from the visible long wavelength region to the near-infrared wavelength region, and is therefore suitable for semiconductor laser light. .

As mentioned above, sensitizers for improving the sensitivity of zinc oxide-based electrophotographic photosensitive layers in the range from the long wavelength region of visible light to the near-infrared wavelength region are disclosed in, for example, JP-A-61-275;
No. 760, JP-A-62-220,962, JP-A-57
-46245, JP-A-58-42055, JP-A-5
It is disclosed in Japanese Patent Application Laid-open No. 8-58554, Japanese Patent Application Publication No. 58-59453, Japanese Patent Application Publication No. 59-22053, Japanese Patent Application Publication No. 78358-1987, and Japanese Patent Application Publication No. 60-26949.

[Problem to be solved by the invention]

The problem to be solved by the present invention is to solve the problem in view of the fact that conventional electrophotographic photoluminescent materials show only a practically unsatisfactory sensitivity to laser light. shows the maximum of
An object of the present invention is to provide an electrophotographic photosensitive material for use with laser light, which has a photosensitive layer.

[Means for Solving the Problems and Their Effects] The electrophotographic photosensitive material for laser light of the present invention includes a conductive substrate, a photoconductive zinc oxide, a binding resin formed on one surface of the substrate, and a conductive substrate. , and a sensitizer, wherein the sensitizer has the following general formulas (I) and (II): 1R
2IO4 and CH2-CH=CH2oR.

[However, in the above formula, R1, R2 and R1 each independently represent CHl, C2H5, and CH2-CH=
Represents one member selected from C1h group, X is Br, C1
and ■ represents an atom and one member selected from -ClO4 and 0SO2-()-CH1 group]
It is characterized in that it consists of at least a compound selected from the following compounds.

The conductive substrate of the electrophotographic material of the present invention can be a known substrate, such as a metal sheet, a metal foil, a paper laminated with a metal foil, a plastic film, a paper having a vapor-deposited metal layer, a plastic film, and You can choose from conductive treated paper, plastic film, etc.

Zinc oxide contained in the photographic photosensitive layer has photoconductivity and is generally 0.2 to 0.5 μm, for example, 0.2 μm to 0.5 μm.
It is a fine powder with a particle size of around 3 μm.

There are no particular limitations on the type of binder resin contained in the photographic photosensitive layer, but known binder resins for photographic photosensitive layers, such as polyacrylic resin, alkyd resin, silicone resin, polystyrene resin, polyacetic acid resin, etc. Preferably, the material contains at least one selected from vinyl resins, polyurethane resins, and the like.

There is no particular limitation on the solid weight of the binding resin contained in the photographic photosensitive layer, but -i is 10% based on the weight of zinc oxide.
It is used within a range of 40% to 40%, preferably 15% to 25%.

The sensitizer contained in the photographic light-sensitive layer is a compound of the following general formulas (I) and <II): RI R2 and CH2-CH=CH2Q R3 [However, in the above formula, R, , R2 and R3 are each independently,
C)13. Represents one member selected from C2H6 and CH2-CH=CH2 group, preferably CI+2-CH
=CH2 group, X is Br, Cf and ■ atom, CNO
4 and O5O□→ri)←represents one member selected from C113 group, preferably ClO4].

The compounds of formulas (1) and (If) above can increase the maximum photosensitivity of the zinc oxide photographic photosensitive layer at the wavelength of semiconductor laser light,
It is particularly effective as a sensitizer within the range of 700 to 11000n, and this was first discovered and put to practical use in the present invention.

The content of the sensitizer of the present invention in the photographic photosensitive layer is not particularly limited.
．． Preferably within the range of 0.001 to 0.5%:
It is more preferably within the range of 0.02% to 0.2%.

The photographic light-sensitive layer of the invention may contain other known additives of the above-mentioned components, for example phthalic anhydride, and/or electron-philic compounds such as benzoquinone in small amounts, for example 0.05% relative to the weight of zinc oxide. It may be contained within the range of ~1%.

The electrophotographic material of the present invention can be produced by known methods. For example, a predetermined amount of zinc oxide, a binding resin, and a sensitizer are mixed with an organic solvent such as toluene or ethyl acetate using a mixing/dispersing machine such as a ball mill, sand grinder, or paint shaker. , adjust the paint. In this mixing step, all the components may be mixed at the same time, or the zinc oxide and sensitizer may be mixed together to uniformly adsorb the sensitizer onto the zinc oxide particles, and the remaining components may be added to the mixture. The ingredients may be mixed.

The resulting paint is applied to the conductive surface of the conductive substrate and dried and solidified to form the desired photographic light-sensitive layer.

The thickness of the dried photographic light-sensitive layer obtained is generally 5 to 20 μm.
It is preferably within the range of m, more preferably within the range of 10 to 15 μm.

〔Example〕

Next, the present invention will be explained in more detail with reference to Examples.

Example 1 In order to prepare a coating material for a photographic photosensitive layer, a mixture having the following composition was prepared.

Ingredients Parts by weight Photoconductive zinc oxide (manufactured by Sakai Chemical Co., Ltd., trade name SAZEX 2000) 85 parts Polyacrylic resin (manufactured by Mitsubishi Rayon Co., Ltd., trade name LR-188) 35 parts - Maximum (1) compound (with the general formula (In (I), R1 and R2 both represent CH1 group) 0.1 part 80 parts of toluene was added to a base paper with a basis weight of 80 g/m2 as a conductive substrate, and a thickness of 1
A composite sheet obtained by laminating 0 μm aluminum foil was used.

The above coating material was applied onto the aluminum foil surface of the substrate using a wire rod and dried at 100°C to form a dry photographic photosensitive layer. The thickness of this dried photographic photosensitive layer was about 15 microns.

The obtained electrophotographic photoreceptor was conditioned in a dark place at 25° C. and 50% RH for 24 hours, and then subjected to negative corona charging treatment under certain conditions in a dark room.

Next, the photographic photosensitive layer was irradiated and scanned with semiconductor laser light (5 m wavelength, 780 nm) according to a predetermined pattern.

Next, the photosensitive layer irradiated with laser light was developed using a positively charged toner (manufactured by Itic Co., Ltd.).

After development, the toner adhesion density in the image formed on the photosensitive layer was relatively compared between the laser beam irradiated area and the non-irradiated area based on the sensitivity to light with a wavelength of 780 nm.

The results are shown in Table 1.

Prefecture 1'', the same operation 3 as in Example 1 was performed. However, as a sensitizer in the coating solution for photographic light-sensitive layers, 0.1 part by weight of the compound of the above-mentioned general formula (1) [wherein R1 and R2 both represent a CH2-CH=C112 group] is used. Ta.

The results are shown in Table 1.

Ml The same operation as in Example 1 was performed. However, as a sensitizer,
- maximum (II) [wherein R3 is C) 12-CIl=
0.05 parts by weight of the compound (CH2 group, X is CIO, group) was used.

The results are shown in Table 1.

1. Same operation as in Example 1 was carried out. However, as a sensitizer, -
Maximum (II) [However, in the formula, R3 is CH2-CH=CH2
0.05 part by weight of the compound (X represents an atom) was used.

The results are shown in Table 1.

Salmon I The same operation as in Example 1 was performed. However, as a sensitizer,
- 0.05 parts by weight of a compound of up to (I), in which R1 and R2 represent a C2H5 group; - up to (II);
A mixture of 0.05 parts by weight of the compound [wherein R3 represents a C112Cl1=CH2 group and X represents a Br atom] was used.

The results are shown in Table 1.

The same operations as in Example 1 were performed. However, as a sensitizer,
0.1 part by weight of rose bengal was used.

The results are shown in Table 1.

Table 1 [Toner adhesion density] As Table 1 clearly shows, the photosensitive layers of Examples 1 to 5 according to the present invention were exposed to semiconductor laser light (wavelength 780
nm), and almost no toner adhered to the exposed areas.

On the other hand, the photographic light-sensitive layer of the comparative example showed substantially no sensitivity to laser light with a wavelength of 780 nm, and the exposed areas showed almost the same toner adhesion density as the unexposed areas.

〔Effect of the invention〕

The photosensitive layer of the electrophotographic material of the present invention exhibits high sensitivity to laser light, particularly semiconductor laser light, and therefore, it has become possible to take practical electrophotographs using semiconductor laser light. This makes electrophotography cheaper and
This also has the advantage of allowing direct modulation and further miniaturizing the device.

Claims (1)

[Claims] 1. A photosensitive layer for laser light, which is formed on one surface of a conductive substrate and includes photoconductive zinc oxide, a binding resin, and a sensitizer. The sensitizer has the following general formulas (I) and (II): ▲There are mathematical formulas, chemical formulas, and tables. However, in the above formula, R_1, R_2, and R_3 each independently represent CH_3, C_2H_5, and CH
_2-CH=CH_Represents one member selected from 2 groups, X
is composed of Br, Cl and I atoms, and -ClO_4 and at least one member selected from the group ▲ has a mathematical formula, chemical formula, table, etc.] Electrophotographic material for laser light.