摘要:
The present invention is a photoconductive element that includes an electrically conductive support, an electrical barrier layer disposed over said electrically conductive support, and disposed over said barrier layer, a charge generation layer capable of generating positive charge carriers when exposed to actinic radiation. The barrier layer includes a vinyl polymer with aromatic tetracarbonylbisimide side groups and crosslinking sites.
摘要:
The present invention relates to photoconductive elements having an electrically conductive support, an electrical barrier layer and, disposed over the barrier layer, a charge generation layer capable of generating positive charge carriers when exposed to actinic radiation. The electrical barrier layer, which restrains injection of positive charge carriers from the conductive support, comprises a crosslinker, a crosslinkable condensation polymer having as a repeating unit a planar, electron-deficient, tetracarbonylbisimide group.
摘要:
The present invention relates to a photosensitive organic semiconductor composition comprising an organic p-type semiconductor pigment with a p-type conducting polymer, wherein the ionization potentials of the organic p-type semiconductor pigment and the p-type conducting polymer are nominally equivalent and a photosensitive organic semiconductor composition comprising an organic n-type semiconductor pigment with an n-type conducting polymer, wherein the electron affinities of the organic semiconductor pigment and the conducting polymer are nominally equivalent. The present invention also relates to a p/n heterojunction utilizing the photosensitive organic semiconductor compositions.
摘要:
The present invention relates to a photosensitive organic semiconductor composition comprising an organic p-type semiconductor pigment with a p-type conducting polymer, wherein the ionization potentials of the organic p-type semiconductor pigment and the p-type conducting polymer are nominally equivalent and a photosensitive organic semiconductor composition comprising an organic n-type semiconductor pigment with an n-type conducting polymer, wherein the electron affinities of the organic semiconductor pigment and the conducting polymer are nominally equivalent. The present invention also relates to a p/n heterojunction utilizing the photosensitive organic semiconductor compositions.
摘要:
The present invention relates to a photosensitive organic semiconductor composition comprising an organic p-type semiconductor pigment with a p-type conducting polymer, wherein the ionization potentials of the organic p-type semiconductor pigment and the p-type conducting polymer are nominally equivalent and a photosensitive organic semiconductor composition comprising an organic n-type semiconductor pigment with an n-type conducting polymer, wherein the electron affinities of the organic semiconductor pigment and the conducting polymer are nominally equivalent. The present invention also relates to a p/n heterojunction utilizing the photosensitive organic semiconductor compositions.
摘要:
This invention relates to electrophotography and to amorphous condensation polymers comprising a polyester-co-imide, polyester-co-imide, polyesterionomer-co-imide, or polyamide-co-imide as a polymeric electrical charge barrier layer.
摘要:
A photoconductive primary image-forming sleeve member for use in an electrophotographic apparatus includes: a cylindrical conductive substrate, a compliant layer formed on the substrate, an electrically conducting protective layer including dispersed tin oxide particles formed on the compliant layer, a barrier layer formed on the protective layer, a charge-generating layer formed on the barrier layer, and a charge-transport layer formed on the charge-generating layer.
摘要:
A method for preparing a coating solution containing a cocrystallized titanyl phthalocyanine-titanyl fluorophthalocyanine, the method comprising: dry milling a charge-generation pigment or mixtures of charge-generation pigments; increasing the amorphousness of the pigment mixture as determined by X-ray crystallography using X-radiation characteristic of Cu Kα at a wavelength of 1.541 Å of the Bragg angle 2θ to provide an amorphous pigment mixture; contacting the amorphous pigment mixture with a first organic solvent having a gammac hydrogen bonding parameter of less than 9, with or without the presence of a dispersant material, to produce a crystalline pigment of the charge-generation pigment prior to contacting the pigment with a second organic solvent having a gammac hydrogen bonding parameter greater than 9; mixing at least one of a second organic solvent, a dispersant and a binder with the crystalline pigment/first solvent mixture without isolating the crystalline pigment to produce a mixture; and, adjusting the concentrations of the first organic solvent, crystalline pigment, binder, dispersants and second organic solvent as required to produce the coating solution of a selected composition.
摘要:
A method for controlling the thickness and uniformity of a dip coated layer, using a coating apparatus under conditions of controlled temperature and controlled low humidity, includes the following steps: under normal coating conditions of ambient temperature and relative humidity, forming on a metal substrate having a thickness of at least about 500 microns a series of coated layers using variations in coating solution viscosity m, coating substrate withdrawal speed v, capillary number Ca, coating solution surface tension S, and boiling point bp (a correlative of evaporation rate)of the coating solution solvent, a coated layer including at least a portion of uniform thickness T(even) and, optionally, a portion of non-uniform thickness L(uneven); statistically analyzing measurements carried out on the series of coated layers and generating the constants, a, b, c, d, and e for Equations 2, 3, and 4: T(even)=a+b(m*v) (Equation 2) L(uneven)=c+d*(v*bp)+e*(Ca*bp) (Equation 3) v(even)=−cfbp*(d+e*m/S) (Equation 4) using Equation 4, determining the coating speed v(even) producing the maximum thickness of a coated layer having a completely uniform thickness for a given set of coating solution characteristics, the coated layer being formed on a thin substrate under coating conditions of controlled temperature and controlled low humidity; and using Equation 2, determining the thickness T(even) of the portion of the coated layer having uniform thickness for a given set of coating solution characteristics and the coating speed determined in step (c), the coated layer being formed on a thin substrate under coating conditions of controlled temperature and controlled low humidity.
摘要:
This invention relates to an aqueous composition for dip coating electrophotographic process equipment members and to a method for coating such electrophotographic members and to a coating produced on such electrophotographic process members by the use of the present composition and method. The composition includes a dispersion of a finely divided metal oxide in water or alcohol, a latex polymer composition, a water-soluble viscosity enhancer and a water miscible volatile solvent.