摘要:
An electrophotographic photosensitive member is formed by disposing a photosensitive layer and a protective layer in this order on an electroconductive support. The protective layer is formed from a resin obtained by polymerization of a curable acrylic monomer having at least three acrylic groups, i.e., acryloyl and/or methacryloyl groups. The protective layer not only shows a good durability against wearing but also can contain fine electroconductive particles therein with a good dispersibility because of the presence of the acrylic groups aiding the dispersion.
摘要:
An image holding member rich in durability and suitably used as an electrophotographic photosensitive member or an electrostatic image-holding dielectric member is prepared by coating a support with a resinous layer formed by polymerization of a phosphazene polyene represented by the following formida: ##STR1## wherein R.sub.1 denotes an ethylenically unsaturated group, preferably an acrylic group represented by --R.sub.2 --OCO--C(R.sub.3)=CH.sub.2, wherein R.sub.2 denotes an alkylene group, arylene group, alkyl-substituted arylene group, alkylamide group or arylamide group, and R.sub.3 denotes a hydrogen atom or a methyl group. The resinous layer may constitute a photosensitive layer, a dielectric layer, or a protective layer covering these layers.
摘要:
An electrophotographic photosensitive member has an electroconductive support and a photosensitive layer thereon which contains a compound of Formula 3, 5-11, 13 or 14 as follows: ##STR1##
摘要:
An electrophotographic photosensitive member of the present invention has a photosensitive lazer containing a compound represented by the formula (1): ##STR1## The electrophotographic photosensitive member has a high sensitivity and can maintain stable and excellent electrophotographic characteristics even when repeatedly used.
摘要:
An image-bearing member suitable for carrying an electrostatic image and/or a toner image is formed by forming a surface layer on a substrate or a photosensitive layer. The surface layer comprises a polymerized and cured product of a photoionically polymerizable compound having two or more functional groups, and shows excellent mechanical and electrical resistance as well as excellent charge-retaining characteristic. As a result, the surface layer provides an image-bearing surface suitable for electrophotography. The surface layer may be a protective layer or a photoconductive layer when it constitutes a photosensitive member.
摘要:
An electrophotographic photosensitive member includes an electroconductive substrate, a photosensitive layer disposed on the electroconductive substrate, and a protective layer disposed on the photosensitive layer, the protective layer containing a resin formed by polymerization of compounds each having two or more ion polymerizable functional groups, and electroconductive particles.
摘要:
A electrophotographic photosensitive member and an electrophotographic apparatus, a device unit and a facsimile machine using an electrophotographic photosensitive member which comprises a conductive support, a photosensitive layer and a protective layer, the protective layer containing resin formed by hardening a light-setting type acrylic monomer, and the photosensitive layer containing at least one compound selected from the group consisting of (A), (B) and (C) below:(A) styryl compounds having a structure expressed by the following formula (1) and a melting point not higher than 135.degree. C.; ##STR1## wherein Ar.sup.1 and Ar.sup.2 are aromatic ring groups, Ar.sup.3 is a bivalent aromatic ring group or a bivalent heterocyclic group, R.sup.1 is an alkyl group or an aromatic ring group, R.sup.2 is a hydrogen atom, an alkyl group or an aromatic ring group, and n.sub.1 is 1 or 2, R.sup.1 and R.sup.2 possibly linking to form a ring when n.sub.1 =1;(B) triarylamine compounds having a structure expressed by the following formula (2) and a melting point not higher than 150.degree. C.; ##STR2## wherein Ar.sup.4, Ar.sup.5 and Ar.sup.6 are each an aromatic ring group or a heterocyclic group:(C) hydrazone compounds having a structure expressed by the following formula (3) and a melting point not higher than 155.degree. C.; ##STR3## wherein R.sup.3 is a hydrogen atom or an alkyl group, R.sup.4 and R.sup.5 are alkyl groups, aralkyl groups or aromatic ring groups, n.sub.2 is 1 or 2, A is an aromatic ring group, a heterocyclic group or --CH.dbd.C(R.sup.6)R.sup.7 (R.sup.6 and R.sup.7 are hydrogen atoms, aromatic ring groups or heterocyclic groups, but will never be hydrogen atoms at the same time). The photosensitive member suppresses the occurrence of cracks during forming of the protective layer, has high durability, and is free from any image defects.
摘要:
An electrophotographic photosensitive member has an electroconductive support, a photosensitive layer, and a protection layer in named order. The protection layer contains a binder resin and a particulate electroconductive material. The particulate electroconductive material has been treated for adhesion of a siloxane compound represented by Formula (1) and subsequently is heat-treated at a temperature of not lower than 120.degree. C.
摘要:
An electrophotographic photosensitive member has a surface having a plurality of depressed portions, having a major-axis diameter Rpc of 0.1 to 10 μm, a minor-axis diameter Lpc of 0.1 to 10 μm and a deepest-part to opening distance Rdv of 0.1 to 10 μm. Where the surface is equally divided into 4 regions in the rotational direction, which are then equally divided into 25 regions in the direction falling at right angles with the rotational direction, to obtain 100-spot regions A in total, and, in each thereof, square regions B of 50 μm each per side one side of which is parallel to the rotational direction are provided and the regions B are each equally divided into 500 zones by straight lines parallel to the rotational direction, 400 to 499 lines among the straight lines pass through the depressed portions in each of the regions B.
摘要:
An object of the present invention is to improve a phenomenon of the life-shortening of the endurance life due to scratch occurring when recesses of a fixed dimple shape are formed on the surface of the surface layer, in order to inhibit the chattering and folding back of a cleaning blade and the fracture of an edge, which occurs because friction between the surface layer of the surface of an electrophotographic photosensitive member and an abutting member is high; and particularly to improve the above described problems, from initial printing through printing on many sheets, which become particularly remarkable when using an electrophotographic photosensitive member with the use of a curable resin that is improved so as to have a high elastic deformation rate for the surface layer, in order to improve the strength of the surface layer, for the purpose of increasing the durability of an electrophotographic photosensitive member. An electrophotographic photosensitive member for achieving the object, which has a support and an organic photosensitive layer, is characterized in that the electrophotographic photosensitive member has dimple-shaped concavities formed on the surface of the surface layer of the electrophotographic photosensitive member, and further has the recesses with the same pattern as that on the surface of the surface layer, formed on the interface created between the surface layer of the organic photosensitive member and the layer directly under the surface layer (a subsurface layer).