| 摘要 |
A heterogeneous photoconductive composition for use in electrophotographic materials comprises a plurality of aggregate photoconductive particles having a predominant particle size of less than 1 micron dispersed in an electrically insulating polymeric binder comprising a blend of from 50.0 to 99.9 weight percent of a non-aggregating polymer effective to reduce particle size and particle size distribution of the aggregate particles formed in the blend and from 0.1 to 50.0 weight percent of an aggregating polymer having repeating units according to the structure: <CHEM> wherein R1 and R2, taken separately are the same or different, and represent hydrogen or alkyl; or R1 and R2, taken together represent the atoms necessary to form a cyclic hydrocarbon radical having up to 14 ring carbon atoms; and R3 and R4 represent hydrogen or alkyl; provided that when R1 and R2 are both methyl, R3 and R4 must both be alkyl. The low aggregate particle size and size distribution provides high resolution and is achieved by combining a pyrylium dye in solution with the polymeric blend. |
