Electrophotographic photoconductor

Pyrido[3,4-6]pyrazines containing the bisazo or tetrakisazo chromophores are useful as high-sensitivity electrophotographic photoconductors <89JAP(K)0128648>. 

Among the electron transport agents, derivatives of oxadiazole [34, 35] have been extensively studied. (Oxadiazoles do emit quite efficiently, but the wavelengths [36] are generally too short to be useful for display applications). By far the most widely used hole transport materials are the aryl-amines, exemplified by TPD [37] (see Table 13-2). Because of their use in electrophotographic photoconductors, dating back to the 1970s, there is an extensive literature [38] on the... 

Y. Suzuki. Electrophotographic photoconductor. US Patent 6960417, assigned to Ricoh Company, Ltd. (Tokyo, JP), November 1, 2005. 

Trans-4-N,N-diaryl aminostilbenes were synthesized by Verkade in a one-pot sequential procedure, consisting of sequential C—N and C—N bond formations [194], Today, these compounds are widely used as electrophotographic photoconductors and receptors. By using 4-aminostyrene and bromobenzene derivatives as... 

Canon K. K. Sensitizer dyes for zinc oxide electrophotographic photoconductors. Jpn. Kokai Tokkyo Koho JP 57016456, 1982 Chem. Abstr. 1982, 97,47133. 

Electrophotographic photoreceptors based on polycarbonate resins have been prepared by treating aromatic dioxy compounds with phosgene [274]. Electrophotographic photoconductors containing fluorine-bearing polycarbonate binders have also been prepared from bisphenol A, phosgene, and 1,1,1,3,3,3-hexafluoro-2,2-bis(4-hydroxyphenyl)propane [275]. 

Kato M, Nishioka Y, Kaifu K, Kawamura K, Ohno S (1985) Nearinfrared sensitive electrophotographic photoconductors using chloroindium chlorophthalocynie. Appl Phys Lett 46 196-197... 

A comparison of perylene patents and review articles over the last twenty years clearly indicates the importance and potential for perylene-based pigments, dyestuffs and their derivatives in non-traditional applications such as electrophotographic photoconductors, laser dyes, and fluorescent probes . ... 

USE Preparation of azoqninone compound suitable as electron transport agent for electrophotographic photoconductor to improve sensitivity [8355]. 

The corona discharges produces oxygen ions and ozone, which may react with the photoconductor [634], As a means to circumvent possible degradation of the surface layer, an extra, protective thin layer was proposed, with high carbon content [101, 635, 636]. This would reduce silicon-oxygen reactions at the surface. Excellent electrophotographic characteristics have been obtained with a thin device comprising a 0.1-/rm-thick n-type a-Si H layer, a 1.0-/rm intrinsic a-Si H layer, a 0.1-/irm undoped a-SiCo i H layer, and a 0.014-/xm undoped a-SiCoj H layer [101]. 

Figure 2.37 The electrophotographic process using organic photoconductors (a) photocopying and (b) laser printing.

There seems no doubt that organic photoconductor systems will permit the development of new reproduction processes based on the electrophotographic principle 10>. Dyes play an important role in this development on the one hand they act as spectral sensitizers of the organic photoconductors (e.g. poly-N-vinyl-carbazole 161> and on the other hand, the photoelectric effects of dyes are important for... 

Metal chelates of 8-hydroxyquinoline such as (111) with photoconductive properties are reported to be useful in electrophotographic systems.233 The incorporation of a tin complex into a photo-conductive zinc oxide layer is stated to reduce dark decay . In other words, the electrostatic charge applied to the photoconductor has a longer lifetime. Two of the complexes disclosed for this application are (112) and (113). These compounds are prepared from dibutyltin oxide by reaction with 2-mercaptopropionic add and thioglycolic acid, respectively 234... 

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