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Electrophotographic photoconductors comprising polyaryl ethers

A technology of polyaryl ether and photoconductor, which is applied in the field of improving the electrical characteristics of photoconductors, forming a charge transfer layer and a charge generation layer, and the field of charge transfer layers, which can solve the problems affecting the pot life of the composition and achieve improved Effect of pot life, good electrical characteristics, and long pot life

Inactive Publication Date: 2003-02-12
LEXMARK INT INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Unfortunately, polytetrafluoroethylene tends to settle in the transfer composition, thus adversely affecting the pot life of the composition

Method used

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  • Electrophotographic photoconductors comprising polyaryl ethers
  • Electrophotographic photoconductors comprising polyaryl ethers

Examples

Experimental program
Comparison scheme
Effect test

Embodiment A

[0109] PAEK and PAES were synthesized by aromatic nucleophilic displacement reactions of difluorobenzophenones or difluorophenyl sulfones using various potassium bisphenolates. The reaction was carried out in N,N-dimethylacetamide solvent. Potassium bisphenolate is generally produced in situ by the reaction of bisphenol with potassium carbonate, and the water thus formed is removed by azeotropic distillation using toluene. In most cases, the reaction mixture became viscous after azeotropic removal of water and toluene and refluxing in dimethylacetamide solvent, which required about 2 hours.

[0110] All polymers were isolated by precipitation. Typical workup involves stirring the yellow-white fibrous polymer in water with a high-speed blender, neutralizing with aqueous acid (about 5% HCl), filtering, stirring in boiling water for 1 hour, filtering, and stirring in boiling methanol for about 0.5 hour , a step of filtering and drying in a vacuum oven at about 100° C. for about...

Embodiment B

[0150] Polyaryl ethers containing carbonyl or sulfonyl units are used for the preparation of dispersions of pigments such as Squirrel (HOSq) and type IV titanylphthalocyanine (TiOPc) in suitable solvents.

[0151] Preparation of Squirrel dispersion in a mixture (90 / 10 w / w) of tetrahydrofuran (THF) and cyclohexanone from HOSq pigments, PAEK including the above poly(bisphenol-A-benzophenone) (Polymer 1) body. The dispersion was stable for about 4-6 hours and eventually the phases separated. The dispersion was coated as a CG layer on an anodized aluminum drum followed by dip coating in a charge transfer solution. This HOSq / PAEK dispersion was compared to a standard control drum prepared by using polyvinyl butyral as the CG binder polymer. In a similar manner, a dispersion containing a blend of polyvinyl butyral (BX-55Z) and PAEK with HOSq was also prepared and compared to the above dip drum.

[0152] In contrast to PAEK dispersions without polyvinyl butyral, blends of polyviny...

Embodiment C

[0166] Several dispersions containing 45% TiOPc Type IV in a THF / cyclohexanone (90 / 10) mixture were prepared using BX-55Z, PAEK and polyvinyl butyral / PAEK blends. Table 7 summarizes the initial electrical properties obtained using photoconductors of these systems at an exposure-development time of 110 ms.

[0167] binder

[0168] V0.21μJ / cm 2 = at 0.21μJ / cm 2 Voltage; V0.42μJ / cm 2 = at 0.42μJ / cm 2 voltage

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Abstract

A photoconductor comprises a substrate and at least one layer. The at least one layer is selected from the group consisting of charge transfer layers comprising a charge transfer molecule, polycarbonate and a first polyaryl ether selected from the group consisting of polyaryletherketones, poly(aryl-perfluoroaryl ether)s, polyaryletherketone-hydrazones, polyaryletherketone-azines and mixtures and copolymers thereof; charge generating layers comprising a pigment, a polyvinylbutyral and a second polyaryl ether selected from the group consisting of polyaryletherketones, polyarylethersulfones and mixtures and copolymers thereof; and mixtures thereof.

Description

field of invention [0001] The present invention relates to photoconductors and compositions for forming photoconductors. More specifically, the present invention relates to a charge transfer layer comprising a substrate and selected from the group consisting of charge transfer molecules, polycarbonate and a first polyarylether; comprising a pigment, polyvinyl butyral and a second polyarylether a charge generating layer; and a layer of a photoconductor in a mixture thereof. The present invention also relates to a method of improving the electrical characteristics of a photoconductor, a method of extending the life of a charge transfer composition, and a composition for forming a charge transfer layer and a charge generation layer. Background of the invention [0002] In electrophotography, a latent image is created on the surface of an imaging element, such as a photoconductive material, by first uniformly charging the surface and then selectively exposing areas of the surfa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G03G5/05G03G5/06G03G5/07
CPCG03G5/076G03G5/0616G03G5/0564G03G5/071G03G5/0567G03G5/0575G03G5/078G03G5/0612G03G5/0542G03G5/075G03G5/0766
Inventor K·R·斯里尼瓦山
Owner LEXMARK INT INC
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