Organic photoreceptors for liquid electrophotography

An electrophotographic system for producing a multi-colored image comprising:

• an photoreceptor comprising:
• an organic photoconductor having a first major surface and a second major surface;
• a barrier layer on the first major surface of the photoconductor formed form a barrier layer coating composition comprising a cellulosic resin, a methylvinylether/maleic anhydride copolymer, and a crosslinking agent;
• and
• a release layer;
• a positioner for movably positioning the photoreceptor in order that a given portion of the photoreceptor sequentially advances through a plurality of locations in a single pass;
• an eraser for erasing any previously accumulated charge from the photoreceptor;
• a charger for charging the photoreceptor to a predetermined charge level;
• at least one image-wise exposing device for exposing the photoreceptor with radiation modulated in accordance with an image data for one of a plurality of colors in order to partially discharge the photoreceptor to a first discharge level to produce an image-wise distribution of charges on the photoreceptor corresponding to the image data for the one of a plurality of colors;
• at least one applicator to apply a first color liquid toner comprising charged particles of the first color and transparent counter-ions, using an electrode electrically biased to a voltage of between the predetermined charge level and the first discharge level, to the photoreceptor as a function of the image-wise distribution of charges on the photoreceptor to form a first color image, wherein a second substantially uniform predetermined photoreceptor charge level results such that it is lower than the first predetermined charge level but being sufficiently high to subsequently repel liquid toner in areas not subsequently further discharged;
• and
• a transferor to transfer at least the first color image and the second color image to a medium to form the multi-colored image.

An organic photoreceptor comprising:

• an organic photoconductor having a first major surface and a second major surface;
• a barrier layer on the first major surface of the photoconductor formed from a barrier layer coating composition comprising a cellulosic resin, a methylvinylether/maleic anhydride copolymer, and a polyamide;
• and
• a release layer.