Abstract: An improved reusable multiactive electrophotographic element has a charge-transport layer comprising a triarylamine charge-transport material in a binder comprising a polyester containing recurring units having the structure ##STR1##

Abstract: An improved reusable multiactive electrophotographic element has a charge-transport layer comprising a triarylamine charge-transport material in a binder comprising a polymer containing recurring units having the structure ##STR1##

Abstract: An electrophographic recording element comprising a combination of photoconductive titanyl phthalocyanine and titanyl fluorophthalocyanine pigments. The pigments or charge-generation materials are dispersed in a binder to form a layer having excellent photosensitivity and resistance to abrasion.

Abstract: The invention provides a polyester containing recurring units having the structure ##STR1## which is especially useful as a binder in a triarylamine-containing charge-transport layer of an electrophotographic element.

Abstract: Photographic elements and emulsions are described which are capable of providing high contrast images. The elements and emulsions comprise negative working silver halide and contrast enhancing arylhydrazide nucleating agents. A process for utilization of the elements and emulsions is also described.

Abstract: The invention provides coated carrier particles and dry electrographic developers comprising a mixture of the carrier particles and toner particles. Each of the carrier particles comprises a core particle having a polymeric overcoat comprising a blend of a fluorine-containing polymer and a modifying polymer comprising poly(p-t-butylstyrene) or a copolymer of p-t-butylstyrene and a C.sub.1 -C.sub.4 alkyl methacrylate.

Abstract: The invention provides coated carrier particles suitable for use in dry electrographic developers comprising a mixture of the carrier particles and toner particles. Each of the carrier particles comprises a core particle having a polymeric overcoat comprising poly(p-t-butylstyrene) or a copolymer of p-t-butylstyrene and a C.sub.1 -C.sub.4 alkyl methacrylate, wherein the polymer further comprises sulfur-containing end groups.

Abstract: An electrophotographic recording element having a layer formed from a liquid composition comprising polymeric binder and dispersed photoconductive titanyl phthalocyanine particles. The titanyl phthalocyanine particles have a particle size up to about 0.2 micrometer and are characterized by certain X-ray diffraction characteristics and the layers are characterized by certain spectral absorption ranges. The coating composition comprises finely-divided photoconductive titanyl phthalocyanine particles dispersed in a solvent solution of polymeric binder and is prepared by the steps of (1) milling a titanyl phthalocyanine pigment with milling media comprising inorganic salt and non-conducting particles under shear conditions in the substantial absence of the solvent to provide pigment having a particle size up to 0.2 micrometer, (2) continuing the milling at higher shear at a temperature up to about 50.degree. C.

Abstract: New electrophotographic elements contain electron-transport agents comprising certain new chemical compounds, which are derivatives of 4H-thiopyran-1,1-dioxides.

Abstract: New electrophotographic elements contain electron-transport agents comprising certain new chemical compounds, which are derivatives of 4H-thiopyran-1,1-dioxides.

Abstract: An electrophotographic recording element having a layer comprising a photoconductive perylene pigment, as a charge generation material, that is sufficiently finely and uniformly dispersed in a polymeric binder to provide the element with excellent electrophotographic speed. The perylene pigments are perylene-3,4,9,10-tetracarboxylic acid imide derivatives.

Abstract: Certain new chemical compounds are derivatives of 4H-thiopyran-1,1-dioxides, and are useful as electron-transport agents in electrophotographic elements.

Abstract: New electrophotographic elements contain electron-transport agents comprising certain new chemical compounds, which are sulfonyl derivatives of dicyanomethylenefluorene.

Abstract: Certain new chemical compounds are derivatives of 4H-thiopyran-1,1-dioxides, and are useful as electron-transport agents in electrophotographic elements.

Abstract: New chemical compounds are derivatives of fluorenones and are useful as electron-transport agents in electrophotographic elements.

Abstract: New chemical compounds are derivatives of certain substituted 1,4-naphthoquinones in which the keto oxygens at the 4-positions have been replaced by certain cyanoalkoxycarbonylmethylene groups, and the keto oxygens at the 1-positions have been replaced by cyanoimino groups. The new compounds have the structure ##STR1## wherein: J is alkyl having 1 to 6 carbon atoms, and R is normal alkyl having 1 to 6 carbon atoms. The compounds are useful as electron-transport agents in electrophotographic elements.

Abstract: New electrophotographic elements contain electron-transport agents comprising certain chemical compounds, which are derivatives of certain substituted 9,10-anthraquinones in which the keto oxygens have been replaced by cyanoimino groups.

Abstract: New chemical compounds are derivatives of certain substituted 1,4-napthoquinones in which the keto oxygens at the 4-positions have been replaced by certain cyanoalkoxycarbonylmethylene groups. The new compounds have the structure ##STR1## wherein: J is alkyl having 1 to 6 carbon atoms, andR is normal alkyl having 1 to 6 carbon atoms.The compounds are useful as electron-transport agents in electrophotographic elements.

Abstract: Disclosed is a method of improving the sharpness of multiple copies made from a single imagewise exposure using an electrostatographic film buffer element having an insulating layer in between a conductive layer and a photoconductive layer, where the element is simultaneously charged and imagewise exposed and then uniformly exposed with light to bury the charges. The improvement consists of performing the uniform exposure with light that is absorbed by the photoconductive layer and does not penetrate through the photoconductive layer to the insulating layer.

Abstract: New electrophotographic elements contain electron-transport agents comprising derivatives of certain substituted 1,4-naphthoquinones in which the keto oxygens at the 4-positions have been replaced by certain cyanoalkoxycarbonylmethylene groups, and the keto oxygens at the 1-positions have been replaced by cyanoimino groups.