Xerox Corporation

Joseph Y Chu

W H Gunther

Richard L Schank

Simpei Tutihasi

Dana G Marsh

Wolfgang H Gunther

Donald C Von Hoene

Robert N Jones

Inan Chen

Keng-San Liang

An improved layered photoresponsive imaging device consisting of

Layered photoresponsive device containing hole injecting ground electrode

This invention is directed to a layered organic photoresponsive device, and a method of highlight color imaging, the device being comprised of (1) a supporting substrate, (2) a layer of material capable of injecting holes into a layer on its surface, this layer being comprised of a material selected from the group consisting of carbon dispersed in a polymer, and graphite dispersed in a polymer, (3) a hole transport layer in operative contact with the layer of hole injecting material, which transport layer comprises a combination of a highly insulating organic resin having dispersed therein small molecules of an electrically active material, the combination of which is substantially nonabsorbing to visible light but allows injection of photogenerated holes from a photogenerating layer in contact with the hole transport layer, and electrically induced holes from the layer of injecting material, (4) a red sensitive charge carrier photogenerating layer sensitive to wavelengths ranging from about the visible range to about 620 millimicrons, said layer being transparent to light of wavelengths of greater than 620 millimicrons, (5) a top layer of a photoconductive material sensitive only to relatively short wavelengths ranging from about the visible range to about 620 millimicrons, said layer being transparent to light of wavelengths of greater than 620 millimicrons. Highlight imaging is accomplished by subjecting the above device to negative charges, followed by subjecting the device to positive charges, imagewise exposing the member, and developing with a colored developer composition comprised of positively charged toner components and negatively charged toner components, and carrier particles.

Color imaging, layered organic photoresponsive device having hole

Disclosed is a layered photosensitive device which can be used in an electrophotographic imaging system, this device comprising a substrate which can be conductive or nonconductive, a hole injecting layer capable of injecting positive charges or holes into a layer on its surface, comprised of trigonal selenium, alloys of selenium-tellurium or nickel selenide, a combined or separate transport and generating layer in operative contact with the layer of hole injecting material such layer in one embodiment being comprised of an inorganic or organic photoconductive materials, and as an optional layer an insulating resin overlaying the photoconductive layer. Examples of materials useful as the transport-generating layer include selenium, arsenic-selenium alloys, metal phthalocyanines, metal free phthalocyanines. Also certain types of diamine compounds can be used as the transport layer.

Hole injecting contact for overcoated photoreceptors

This invention relates to an electrophotographic imaging member or device and an imaging method using this imaging member, which member or device is comprised of a substrate, a layer of a charge carrier injecting material comprised of carbon or graphite dispersed in a polymer, a layer of a charge carrier transport material, a layer of a photoconductive charge carrier generating material and an electrically insulating overcoating layer. In one embodiment the imaging member is layered and comprises from the bottom up a substrate; a layer of material comprised of carbon black dispersed in a polymer, and capable of injecting holes into a layer on its surface; a hole transport layer in operative contact with the layer of hole injecting material which transport layer comprises a combination of an electrically inactive organic resin having dispersed therein an electrically active material, the combination of which is substantially nonabsorbing to visible electromagnetic radiation, but allows the injecting of photogenerated holes from a charge generator layer in contact with the hole transport layer and electrically induced holes from the layer of injecting material; a layer of charge generating material on and in operative connection with the charge transport layer and a layer of insulating organic resin overlaying the layer of charge generating material.

Dielectric overcoated photoresponsive imaging member and imaging method

Disclosed is an adhesive generating layer for use in an overcoated photoreceptor system, this layer containing a generating pigment dispersed in a copolymer of a siloxane and a dihydroxy compound of the formula: ##STR1## wherein R and R' are independently selected from the group consisting of alkyl, substituted alkyl, alkenes, substituted alkenes, aryl and substituted aryl; Y is a dihydroxy radical; and n is a number of sufficient value that the average molecular weight of the resulting silicone copolymer is between about 2,000 and 250,000. Examples of copolymers include those wherein R and R' are alkyl groups such as methyl and Y is a biphenol such as 2,2-bis-(4-hydroxy phenyl)-propane, one preferred material being a methyl octyl siloxane 2,2-bis-(4-hydroxy phenyl)-propane copolymer. Examples of pigments that are dispersed in the generating layer include metal free phthalocyanines, such as X phthalocyanine, alpha phthalocyanine, beta phthalocyanine, metal phthalocyanines such as vanadyl phthalocyanine, selenium, selenium containing compounds such as selenium alloys including selenium arsenic, selenium bismith, and other types of selenium compounds such as trigonal selenium. This adhesive generating layer is useful in an overcoated photoreceptor containing for example an electrically conductive substrate, overcoated with a layer of material capable of injecting holes into a layer on its surface, a hole transport layer in operative contact with the layer of hole injecting material, overcoated by a layer of the charge generating adhesive material on and in operative contact with the charge transport layer and a layer of an insulating organic resin overlaying the charge generating layer.

Electrophotographic imaging processes utilizing adhesive generator

Dielectric overcoated photoresponsive imaging member

Adhesive generator overcoated photoreceptors

Disclosed is a layered photosensitive device for use in electrostatographic copying. The device comprises:

Electrostatographic photosensitive device comprising hole injecting and

Waterless lithographic printing masters of improved contrast are provided by a coating suitable master substrate with a silicone elastomer gum having reactive pendant hydroxyl or amino groups, reacting a photo and/or thermally reactive azide with said pendant groups, depositing a particulate image pattern on said silicone comprising a thermoplastic organohydrocarbon polymer and crosslinking said silicone and chemically bonding said organohydrocarbon to said silicone to form a durable imaged waterless lithographic printing master.

Elastomers and improved waterless lithographic printing masters

Novel elastomers and improved waterless lithographic printing masters

Microfilm structures of improved contrast are provided by coating a suitable transparent film substrate with an intermediate layer of a silicone elastomer which is abhesive to ink, coating said silicone with a surface layer of a photosensitive polymer which when exposed to activating electromagnetic radiation cross-links and chemically attaches to said silicone elastomer to form oleophilic ink accepting image areas, imagewise exposing said photosensitive polymer, removing the non-exposed, light sensitive polymer to form non-imaged areas of the abhesive silicone elastomer, and selectively inking the oleophilic image areas to form an imaged microfilm structure of improved image density and contrast.

Novel microfilm and process for preparation

Disclosed is an imaging method which comprises:

Imagewise exposing and heating a microimaging film containing an organo

Disclosed is a microimaging composition which comprises a film of an organic polymer as a matrix material having uniformly dispersed therein:

Microimaging film containing an organo diselenide, a tertiary phosphine

Process for preparation of transparencies from a solid phase dispersion of photoconductive particles in an insulating binder matrix. In this process, a dispersion is initially formed from an insulating polymer resin and an organoselenium compound capable of undergoing selective decomposition in response to an appropriate stimulus, whereby elemental selenium is extruded from said organoselenium compound and deposited within the polymeric resin. As a result of this deposition of elemental selenium within the insulating layer, the layer is rendered photoresponsive and can be used in conventional electrophotographic processes. Subsequent to the development and fusion of a developer image on this imaging member, the extrusion/deposition reaction can be reversed and the selenium deposit erased thus leaving a toner image fused to a substantially transparent polymeric film.

Process for preparation of transparencies by selective decomposition of

Process for preparation of a solid phase dispersion of photoconductive materials in an insulating binder matrix from a film forming insulating polymeric resin and an organo-selenium compound capable of undergoing selective decomposition in response to an appropriate stimulus; whereby, elemental selenium is extruded from said organo-selenium compound and deposited in the binder matrix. Because this extrusion/deposition of elemental selenium can be performed selectively, it is possible to prepare binder films having photoconductive image patterns which are suitable for use in range extended and conventional xerography.

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Fairport, NY, United States of America

Joseph Y Chu