| 摘要 |
A specific class of crystalline organic pigments having the formula <IMAGE> WHEREIN N IS 1 OR 2; X consists of the atoms necessary to complete a naphthalene, anthracene, or <IMAGE> R1, R2, and R3 are independently selected from the group consisting of hydrogen, halogen, alkoxy, NO2, alkyl, SO3H or alkali metal salts thereof, and COOH or alkali metal salts thereof; and wherein R2 and R3 can comprise the atoms necessary to complete a phenyl, naphthyl or anthryl ring; and R is selected from the group consisting of <IMAGE> or COOM wherein M is alkyl or an alkali or alkaline earth metal is useful as sensitizers for photoconductive compositions in electrophotographic processes.
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