| 摘要 |
PURPOSE:To obtain photoconductive powder which has sufficient elelctrostatic adhesion force even to plain paper and is nevertheless able to form images of high image density and resolving power by providing a photoconductor layer of uniform thickness on the insulating cores comprising uniform fine particles. CONSTITUTION:A photoconductor layer 32 comprising an equal mole mixture of N-polyvinyl carbazole and trinitrofluorenone and benzoate ester is provided on insulating cores 31 of 10-30mu grain sizes to obtain photoconductive powder. For example, methacrylate ester, polymerization catalysts and demulsifier are charged into water, and while the mixture is stirred, it is polymerized at about 50-100 deg.C, whereby the insulating cores of 10-30mu grain sizes are formed. Next, the tetrahydrofuran soln. of the equal mole mixture of n-polyvinyl carbozole and 2, 4 7- trinitrofluorenone and about 5-50mol% benzoate ester is sprayed on the above- mentioned insulating cores, whereby the photoconductive layer of about 2-10mu thickness is formed. |
