Process for fabricating electrophotographic imaging members

Details Process for fabricating electrophotographic imaging members Process for fabricating electrophotographic imaging members

G - Physics

03

G

G03G 5/05 (2006.01) G03G 5/04 (2006.01) G03G 5/06 (2006.01)

Patent

CA 2125713

A process for fabricating an electrophotographic imaging member including providing a substrate to be coated, forming a coating comprising photoconductive pigment particles having an average particle size of less than about 0.6 micrometer dispersed in a solution of a solvent comprising n-alkyl acetate having from 3 to 5 carbon atoms in the alkyl group and a film forming polymer consisting essentially of a film forming polymer having a polyvinyl butyral content between about 50 and about 75 mol percent, a polyvinyl alcohol content between about 12 and about 50 mol percent, and a polyvinyl acetate content is between about 0 to 15 mol percent, the photoconductive pigment particles including a mixture of at least two different phthalocyanine pigment particles free of vanadyl phthalocyanine pigment particles, drying the coating to remove substantially all of the alkyl acetate solvent to form a dried charge generation layer comprising between about 50 percent and about 90 percent by weight of the pigment particles based on the total weight of the dried charge generation layer, and forming a charge transport layer.

Procédé pour fabriquer un élément d'imagerie électrophotographique comprenant la fourniture d'un substrat à revêtir, la formation d'un revêtement comprenant des particules de pigment photoconducteur dont la granulométrie moyenne est inférieure à environ 0,6 micromètre dispersées dans une solution de solvant comprenant de l'acétate n-alkylique dont le groupe alkyle porte 3 à 5 atomes de carbone et un polymère filmogène constitué essentiellement d'un polymère filmogène ayant une teneur en poly(butyral de vinyle) variant entre environ 50 et environ 75 %, en pourcentage molaire, une teneur en poly(alcool de vinyle) variant entre environ 12 et environ 50 %, en pourcentage molaire, et une teneur en poly(acétate de vinyle) variant entre environ 0 à 15 %, en pourcentage molaire, les particules de pigment photoconducteur comprenant un mélange d'au moins deux particules de pigment de phtalocyanine différent exempt de particules de pigment de phtalocyanine de vanadyle, le séchage du revêtement pour éliminer substantiellement tout le solvant d'acétate d'alkyle pour former une couche de génération de charges sèches comprenant entre environ 50 % et environ 90 % en poids de particules de pigment, par rapport au poids total de la couche de génération de charges sèches, et former une couche de transport de charges.

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