Electrophotographic photoreceptor, process cartridge, and image forming apparatus
View Patent ↗An electrophotographic photoreceptor includes a conductive support and a photosensitive layer. The photosensitive layer is disposed on the conductive support, and includes a layer that includes, in the same layer, at least a charge generating material and a compound having a triple bond and a hydroxy group.
1. An electrophotographic photoreceptor comprising a conductive support and a photosensitive layer, the photosensitive layer being disposed on the conductive support, and including a plurality of layers, one of the plurality of layers, which is not an outermost layer of the photosensitive layer, including at least a charge generating material and a compound having a triple bond and a hydroxyl group represented by the following Formula (A-1):
wherein, in Formula (A-1), R 1 , R 2 , R 3 , and R 4 —each independently represent an alkyl group, and at least one of R 1 , R 2 , R 3 , and R 4 —represents a branched alkyl group.
2. The electrophotographic photoreceptor according to claim 1 , wherein R 1 , R 2 , R 3 , and R 4 —in Formula (A-1) each represent an alkyl group having 1 to about 20 carbon atoms.
3. The electrophotographic photoreceptor according to claim 1 , wherein a content of the compound having a triple bond and a hydroxyl group in the layer including the compound having a triple bond and a hydroxyl group is from about 0.01% by weight to about 10% by weight with respect to the total solid content of the layer.
4. The electrophotographic photoreceptor according to claim 1 , wherein a content of the compound having a triple bond and a hydroxyl group in the layer including the compound having a triple bond and a hydroxyl group is from about 0.1% by weight to about 0.5% by weight with respect to the total solid content of the layer.
5. The electrophotographic photoreceptor according to claim 1 , wherein the charge generating material is a phthalocyanine pigment.
6. The electrophotographic photoreceptor according to claim 5 , wherein the phthalocyanine pigment is a hydroxygallium phthalocyanine pigment having diffraction peaks at Bragg angles (2θ±0.2°) to CuKα characteristic X-rays of 7.5°, 9.9°, 12.5°, 16.3°, 18.6°, 25.1°, and 28.3°.
7. The electrophotographic photoreceptor according to claim 6 , wherein a half-value width of the diffraction peak at 7.5° is from about 0.35° to about 1.20°.
8. The electrophotographic photoreceptor according to claim 1 , wherein a thickness of the layer containing the charge generating material and the compound having a triple bond and a hydroxyl group is from about 0.1 μm to about 5 μm.
9. The electrophotographic photoreceptor according to claim 1 , wherein a thickness of the layer containing the charge generating material and the compound having a triple bond and a hydroxyl group is from about 0.2 μm to about 2.0 μm.
10. The electrophotographic photoreceptor according to claim 1 , wherein the charge generating material is titanyl phthalocyanine, chlorogallium phthalocyanine, or hydroxygallium phthalocyanine, and the layer containing the charge generating material and the compound having a triple bond and a hydroxyl group is applied using n-butyl acetate as a solvent.
11. A process cartridge comprising the electrophotographic photoreceptor according to claim 1 and at least one of the following:
a charging unit configured to charge the electrophotographic photoreceptor,
a developing unit configured to develop, with a toner, an electrostatic latent image formed on the electrophotographic photoreceptor, so as to form a toner image, and
a toner removing unit configured to remove the toner remaining on the surface of the electrophotographic photoreceptor.
12. The process cartridge according to claim 11 , wherein the charge generating material is titanyl phthalocyanine, chlorogallium phthalocyanine, or hydroxygallium phthalocyanine, and the layer containing the charge generating material and the compound having a triple bond and a hydroxyl group is applied using n-butyl acetate as a solvent.
13. An image forming apparatus comprising:
the electrophotographic photoreceptor of claim 1 ,
a charging unit configured to charge the electrophotographic photoreceptor,
an electrostatic latent image configured to form unit for forming an electrostatic latent image on the charged electrophotographic photoreceptor,
a developing unit configured to develop, with a toner, an electrostatic latent image formed on the electrophotographic photoreceptor, so as to form a toner image, and
a transfer unit configured to transfer the toner image to a member to which the toner image is to be transferred.
14. The image forming apparatus according to claim 13 , wherein the charge generating material is titanyl phthalocyanine, chlorogallium phthalocyanine, or hydroxygallium phthalocyanine, and the layer containing the charge generating material and the compound having a triple bond and a hydroxyl group is applied using n-butyl acetate as a solvent.