酸化亜鉛樹脂系電子写真感光層におけるメロシアニン色素の増感作用と酸化亜鉛に対する吸着

抄録

Eight kinds of merocyanine dyes having almost the same chemical structure, only different in one substituent in each, were synthesized to study the correlations of spectral sensitization with adsorption of dyes to zinc oxide fine crystals in electrophotographic layers.
The merocyanine dyes are 3-substituted 5-[(1-ethyl-4-(1H)-quinolylidene)-ethylidene]-rhodanine derivatives, substituents being hydrogen, ethyl, 2-hydroxyethyl, carboxymethyl, 2-sodium sulfoethyl, 2-diethylaminoethyl, phenyl and p-hydroxyphenyl groups.
Only when a polar, especially an anionic, group is introduced to a dye structure, the dye sensitizes the photoconductivity of a zinc oxide-resin electrophotographic layer, and is adsorbed by zinc oxide markedly. The dye sensitization efficiency is proved proportional to the amount of adsorbed dye.
Comparison of adsorption experiments in the presence of binder resin with those in the absence of it suggests the competitive adsorption between dye and resin.