Improved charge transport material having the formula: 
Y 1 -Z 1 -X-E where E comprises a 9-fluorenonyl group, a dicyanomethylene-9-fluorenonyl group, or a -Z 2 -Y 2 group; Z 1 and Z 2 comprise, each independently, a 1,3,6,8-tetraoxo-1,3,6,8-tetrahydrobenzo[lmn][3,8]phenanthroline-2,7-diyl group; Y 1 and Y 2 comprise, each independently, H or an organic group, such as an alkyl group, an aryl group, an aromatic heterocyclic group, and combinations thereof; and X comprises a bond, O, S, an aminylene group, a sulfonyl group, an organic linking group, or a combination thereof. The methods of using the charge transport materials in organophotoreceptors, electrophotographic imaging apparatuses, and electrophotographic imaging processes are also described.

Charge transport materials having a 1,3,6,8-tetraoxo-1,3,6,8-tetrahydrobenzo[lmn][3,8]phenanthroline-2,7-diyl group

PROBLEM TO BE SOLVED: To provide a cylindrical body holder in which a liquid such as a cleaning fluid hardly remains and a method for manufacturing a photosensitive drum using the holderSOLUTION: A holder 1 includes a holder body unit 2 that is inserted and disposed from a lower end opening of a cylindrical body 30 into an inside 31 of the cylindrical body 30, and a receiving unit 10 having a receiving face 11 that makes a low end 32 of the cylindrical body 30 contact with the low end 32 to receive it The holder body unit 2 includes a plurality of first blade units 5 that radially protrude in a radially outside direction relative to a shaft line P of the holder 1 and extend in a shaft line P direction of the holder 1 The receiving unit 10 includes a plurality of second blade units 15 that radially protrude in a radially outside direction relative to the shaft line P and extend in the shaft line P direction An upper end face 16 of the second blade unit 15 includes the receiving face 11 The first blade unit 5 and the second blade unit 15 are separated in a peripheral direction of the holder 1SELECTED DRAWING: Figure 3

Cylindrical body holder

The invention provides an electrophotographic photoreceptor, an electrophotographic apparatus and a package of the electrophotographic receptor. The negative charged multilayer electrophotographic photoreceptor comprises a charge generating layer (3) and a charge transporting layer (4) successively arranged on a conductive substrate (1) directly or with an intermediate layer (2) therebetween. The charge transporting layer contains at least a hole transporting substance, an electron transporting substance and a binder resin. The ratio (RPN) (mass %), represented by a formula (1), of the mass of the hole transporting substance (P) to the mass of the electron transporting substance (N) satisfies a formula (2), RPN = (N / (P + N)) * 100 (1), 1 [omega] / cm , the surface potential difference ([Delta]Vo) and half-tone potential difference ([Delta]Vh) between before and after the voltage application are both 15 V or less.

Electrophotographic photoreceptor, electrophotographic apparatus and package of electrophotographic photoreceptor

PROBLEM TO BE SOLVED: To obtain the subject new derivative comprising a specific fluorenone derivative having oxadiazole ring and bisazo group, having high sensitivity and good color-sensitive property, excellent in stability and durability and capable of withstanding repeated use and useful for electrophotographic photoreceptors, etc. SOLUTION: This new fluorenone derivative is represented by formula I (K and K are each a coupling residue containing hydroxyl group having a coupling ability) and has high sensitivity, good color-sensitive property and slight fatigue by light. Therefore, the fluorenone derivative hardly causes variation of sensitivity, antistatic property and residual electric potential when repeatedly used and has high stability and excellent durability and is useful for electrophotographic copying machines as well as photoreceptors for printers such as laser printer, liquid crystal and shutter printer. The compound is obtained by reacting 2-amino-9-fluorenone-7-carboxylic acid of formula II with hydrazium sulfate to afford a diamine of formula III, subjecting the diamine to tetrazotization according to ordinary method and coupling the resultant azo compound to the corresponding coupler.

Fluorenone derivative and electrophotographic photoreceptor using the same

PROBLEM TO BE SOLVED: To provide a pallet usable for container boxes different in size SOLUTION: The pallet 1 for holding cylindrical members is composed of: a supporting board 2; columnar supports 3 which stand on the supporting board 2 and are inserted in the hollows of cylindrical members to support the cylindrical members; connectors 4, 5 disposed in the supporting board 2; and connector receiving portions 6, 7 disposed in the supporting board 2 and capable of detachably fastening the supporting board 2 to another supporting board 2 in cooperation with connectors 4, 5 disposed in the another supporting board 2 COPYRIGHT: (C)2007,JPO&INPIT

Pallet, and member for extending columnar support thereof

PROBLEM TO BE SOLVED: To provide a packing method for preventing deformation of a sheet-like electronic photograph photoreceptor such as wrinkle or twisting, during transport of the sheet-like electronic photograph photoreceptor.SOLUTION: The packing method of sheet-like electronic photograph photoreceptor is a packing method for laminating plural sheet-like electronic photograph photoreceptors for packing. A protection sheet having long sides and short sides is sandwiched between the sheet-like electronic photograph photoreceptors, and the protection sheet has shrinkage degree on long side directions to variation of humidity smaller than that on short side directions to variation of humidity.

Packing method of sheet-like electronic photograph photoreceptor

PROBLEM TO BE SOLVED: To form a photosensitive layer of an electrophotographic photoreceptor by using bisphenol-A-polycarbonate produced by a continuous process by a melting method, as well as using a non-halogen solvent, and thereby, to provide an electrophotographic photoreceptor that reduces loads on a human body and an environment and is advantageous from the viewpoint of costs.SOLUTION: A method for manufacturing an electrophotographic photoreceptor is provided for manufacturing an electrophotographic photoreceptor having a photosensitive layer, and the method includes: a step of preparing a resin composition by melting and kneading a polycarbonate resin (A) having a structural unit represented by a specific structure, produced by a transesterification reaction of a carbonic diester and an aromatic dihydroxy compound, and a polycarbonate resin (B) having a structural unit represented by a specific structure different from the resin (A); a step of preparing a coating liquid for forming a photosensitive layer, which comprises the above resin composition, by using a non-halogen solvent; and a step of forming a photosensitive layer by using the coating liquid for forming a photosensitive layer.

Method for manufacturing electrophotographic photoreceptor, and electrophotographic photoreceptor

PROBLEM TO BE SOLVED: To provide an electrophotographic photoreceptor that exhibits sufficient crack resistance in a liquid development system even when a charge transport material and resin having low crack resistance are used, and exhibits excellent electrical characteristics even on a thin film; and an image forming apparatus including the electrophotographic photoreceptor.SOLUTION: There is provided a laminated-type electrophotographic photoreceptor for liquid development including a charge generating layer and a charge transport layer on a conductive support, in which the charge transport layer contains a polyester resin having a repeating structure represented by the formula (1), and has a film thickness of 20 μm or less and a residual solvent amount in the charge transport layer in a range from 5 mg/cmto 50 mg/cm.

Furuune Makoto

Papers

Fluorenone derivative and electrophotographic photoreceptor using the same

Pallet, and member for extending columnar support thereof

Packing method of sheet-like electronic photograph photoreceptor

Method for manufacturing electrophotographic photoreceptor, and electrophotographic photoreceptor

Electrophotographic photoreceptor for liquid development, and image forming apparatus