Single layer type electrophotographic photoconductor and image forming device
The present invention provides a single layer type electrophotographic photoconductor which exhibits the small number of generated black spots in a formed image and exhibits the excellent sensitivity characteristic even when the photoconductor is used for a long time or a photoconductor drum is rotated at a high speed and an image display device which includes the single layer type electrophotographic photoconductor. In the single layer type electrophotographic photoconductor which includes a photoconductive layer containing a binding resin, a hole transporting agent and an charge generating agent, the photoconductor contains a water-repellant polycarbonate resin as the binding resin, and a contact angle of pure water (measured temperature: 25° C.) with respect to the photoconductive layer is set to 100° or more.
1. A single layer type electrophotographic photoconductor which includes a photoconductive layer containing a binding resin, a hole transporting agent and a charge generating agent,
wherein the photoconductor contains as the binding resin, a water-repellent polycarbonate resin having a siloxane structure, which is present non-uniformly in a surface of the photoconductive layer,
and a contact angle of pure water (measured temperature: 25° C.) with respect to the photoconductive layer is set to 100° or more.
2. The single layer type electrophotographic photoconductor according to claim 1 , wherein the contact angle of the pure water (measured temperature: 25° C.) wit respect to the water-repellent polycarbonate resin is set to 98° or more.
3. The single layer type electrophotographic photoconductor according to claim 1 , wherein assuming a total amount of the polycarbonate resin having the siloxane structure as 100 mol %, a content ratio of the units having the siloxane structure is set to a value which falls within a range of 0.1 to 20 mol %.
4. The single layer type electrophotographic photoconductor according to claim 1 , wherein the photoconductor contains, as the hole transporting agent, a compound having the contact angle (measured temperature: 25° C.) of 90° or more with respect to the pure water in a resin dispersion film.
5. The single layer type electrophotographic photoconductor according to claim 1 , wherein the photoconductor contains, as the hole transporting agent, a compound having a triphenylamine skeleton which includes the stilbene structure.
6. The single layer type electrophotographic photoconductor according to claim 1 , wherein the photoconductive layer contains, as an additive, at least a compound selected from a group consisting of compounds represented by following general formulae (1) to (4):
(In the general formula (1), R 1 to R 10 are respectively independent substituted groups and represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbons, a substituted or unsubstituted alkoxy group having 1 to 12 carbons, a substituted or unsubstituted aryl group having 6 to 30 carbons, a substituted or unsubstituted aralkyl group having 6 to 30 carbons, a substituted or unsubstituted cycloalkyl group, a hydroxyl group, a cyano group, a nitro group, an amino group or a halogen alkyl group having 3 to 12 carbons);
(In the general formula (2), R 11 to R 12 are respectively independent substituted groups and represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbons, a substituted or unsubstituted alkoxy group having 1 to 12 carbons, a substituted or unsubstituted aryl group having 6 to 30 carbons, a substituted or unsubstituted aralkyl group having 6 to 30 carbons, a substituted or unsubstituted cycloalkyl group, a hydroxyl group, a cyano group, a nitro group, an amino group or a halogen alkyl group having 3 to 12 carbons);
(In the general formula (3), R 14 and R 15 are respectively independent substituted groups and represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbons, a substituted or unsubstituted alkoxy group having 1 to 12 carbons, a substituted or unsubstituted aryl group having 6 to 30 carbons, a substituted or unsubstituted aralkyl group having 6 to 30 carbons, a substituted or unsubstituted cycloalkyl group, a hydroxyl group, a cyano group, a nitro group, an amino group or a halogen alkyl group having 3 to 12 carbons);
(In the general formula (4), R 16 to R 22 are respectively independent substituted groups and represent a hydrogen atom, a halogen atom, a substituted or unsubstituted alkyl group having 1 to 12 carbons, a substituted or unsubstituted alkoxy group having 1 to 12 carbons, a substituted or unsubstituted aryl group having 6 to 30 carbons, a substituted or unsubstituted aralkyl group having 6 to 30 carbons, a substituted or unsubstituted cycloalkyl group, a hydroxyl group, a cyano group, a nitro group, an amino group or a halogen alkyl group having 3 to 12 carbons).
7. The single layer type electrophotographic photoconductor according to claim 6 , wherein a content of the additive with respect to a total weight of the photoconductive layer is set to a value which falls within a range of 1.5 to 15 weight %.
8. The single layer type electrophotographic photoconductor according to claim 1 , wherein the said photoconductor provides a drum which diameter is set to 30 mm or less.