Radiation imagery chemistry: process – composition – or product th – Electric or magnetic imagery – e.g. – xerography,... – Radiation-sensitive composition or product
Reexamination Certificate
1998-11-18
2001-05-08
Rodee, Christopher (Department: 1753)
Radiation imagery chemistry: process, composition, or product th
Electric or magnetic imagery, e.g., xerography,...
Radiation-sensitive composition or product
C430S056000, C430S062000, C399S111000, C399S159000
Reexamination Certificate
active
06228546
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a polymer having a novel structure, and in particular, relates to a polymer having electron transportability. The present invention also relates to an electrophotographic photosensitive member containing this polymer, and a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.
2. Description of the Related Art
Electronic devices such as electrophotographic photosensitive members and solar batteries require materials for effectively transporting only electrons or holes. Hole-transporting materials which transport only holes at a high efficiency have been widely used for electrophotographic photosensitive members. Charge-transporting materials also have been used for ozone-free electrophotographic photosensitive members. Examples of known charge-transporting materials include organic materials, such as a diphenoquinone derivative (as disclosed in Japanese Patent Laid-Open No. 3-216662), an imide derivative (as disclosed in Japanese Patent Laid-Open No. 5-27469), and a TNF derivative (as disclosed in Japanese Patent Laid-Open No. 2-203352); and low.molecular weight compounds, e.g. a charge-transporting complex comprising an acceptor compound and a donor compound (as disclosed in Japanese Patent Laid-Open No. 1-314253). Further, polymeric compounds having electron transportability are disclosed in Japanese Patent Laid-Open Nos. 2-123370 and 4-353858.
Charge-transporting materials, however, have not been disclosed as much as hole-transporting materials. The low molecular weight compound must be dissolved into an appropriate resin in the film forming process. However, the solubility or compatibility of the charge-transporting material in the resin matrix is limited. When a high content of the charge-transporting material is added, the crystals of the charge-transporting material are precipitated. On the other hand, a low content of the charge-transporting material does not have sufficient electron transportability. Since the low molecular weight compound does not have satisfactory mechanical strength, scuffs and cracks form in use. Most of the polymeric compounds are a side chain type in which side chains have electron transportability. In side chain type polymeric compounds, cohesiveness between molecular chains is low, and this inhibits improvement in the electron transportability.
SUMMARY OF THE INVENTION
It is an object of the present invention to provide a novel polymer having electron transportability.
It is another object of the present invention to provide a polymer having electron transportability allowing the formation of a significantly uniform film.
It is still another object of the present invention to provide an electrophotographic photosensitive member containing the polymer.
It is a further object of the present invention to provide an electrophotographic photosensitive member having high sensitivity and high durability.
It is a still further object of the present invention to provide a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.
A first aspect of the present invention is a polymer having a structural unit represented by the following formula (1):
wherein X is single bond, substituted or unsubstituted alkylene group, —S—, or —O—, R
1
to R
6
are each hydrogen atom, substituted or unsubstituted alkyl group, or substituted or unsubstituted alkoxy group, and R
1
to R
6
may be the same or different.
A second aspect of the present invention is an electrophotographic photosensitive member comprising a substrate and a photosensitive layer formed thereon;
the photosensitive layer containing a polymer having a structural unit represented by the following formula (1):
wherein X is single bond, substituted or unsubstituted alkylene group, —S—, or —O—, R
1
to R
6
are each hydrogen atom, substituted or unsubstituted alkyl group, or substituted or unsubstituted alkoxy group, and R
1
to R
6
may be the same or different.
A third aspect of the present invention is an electrophotographic photosensitive member comprising a substrate, an intermediate layer on the substrate, and a photosensitive layer on the intermediate layer;
the intermediate layer containing a polymer having a structural unit represented by the following formula (1):
wherein X is single bond, substituted or unsubstituted alkylene group, —S—, or —O—, R
1
to R
6
are each hydrogen atom, substituted or unsubstituted alkyl group, or substituted or unsubstituted alkoxy group, and R
1
to R
6
may be the same or different.
Further aspects of the present invention are a process cartridge and an electrophotographic apparatus having the electrophotographic photosensitive member.
Further objects, features and advantages of the present invention will become apparent from the following description of the preferred embodiments with reference to the attached drawings.
REFERENCES:
patent: 4061617 (1977-12-01), Hay
patent: 5449580 (1995-09-01), Nakamori et al.
patent: 63-050851 (1988-03-01), None
patent: 314253 (1989-12-01), None
patent: 123370 (1990-05-01), None
patent: 203352 (1990-08-01), None
patent: 216662 (1991-09-01), None
patent: 4-353858 (1992-12-01), None
patent: 353853 (1992-12-01), None
patent: 5 027469 (1993-02-01), None
patent: 5-323639 (1993-12-01), None
patent: 6-11859 (1994-01-01), None
patent: 6-11863 (1994-01-01), None
Gattrell, M. A Fourier Transform Infrared Spectroscopy Study or the Passive Film Produced during Aqueous Acidic Phenol Electro-oxidation. J. Electrochem. Soc., vol. 139, No. 10, pp. 2736-2744, Oct. 1992.
Kashizaki Yoshio
Sekido Kunihiko
Senoo Akihiro
Canon Kabushiki Kaisha
Fitzpatrick ,Cella, Harper & Scinto
Rodee Christopher
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