Abstract: A method for electrostatically producing prepress printing proofs that accurately predict results of actual press runs for a given press having known or desired characteristic response.

Abstract: A method of using a liquid electrophotographic toner with a permanent master to electrostatically transfer a electrophotographically developed electrostatic image via a reversal photographic process from the permanent master to a receiving surface is disclosed. The permanent master is made from a multilayer plate of a photopolymer material and a protective overcoated material whose surface is hard, low friction and acts as a physical and chemical barrier.

Abstract: A multicolor reproduction is made by uniformly charging a photoconductive member, imagewise exposing that member to create a first electrostatic image, developing the first electrostatic image with a toner of a first color to create a first toner image, preferably uniformly recharging the photoconductive member, imagewise exposing the charged member creating a second electrostatic image, developing the second electrostatic image by the application of toner of a second color to the exposed areas. The process can be repeated for any number of colors. The multicolor image is then transferred in a single step to a receiving sheet. The second and subsequent development steps are carried out by a magnetic brush developing device employing hard magnetic carrier particles that are tumbled through a development zone which tumbling does not adversely affect the prior toner images.

Abstract: A radiation beam used for selectively exposing a surface is moved in a helical path by means of two oscillating mirrors vibrating about axes that are mutually perpendicular. By maintaining a constant product for oscillating frequency and rotational oscillatory mirror deflection, the level of exposure can be made substantially constant.

Abstract: An imaging member having a flexible supporting substrate layer, an electrically conductive layer, an optional adhesive layer, a charge generator layer and a change transport layer, the supporting layer having a thermal contraction coefficient substantially identical to the thermal contraction coefficient the charge transport layer. This imaging member may be employed in an electrostatographic imaging process.

Abstract: An object of the invention is to provide a copy machine for recording an additional information onto a copy of document without reducing the document original image. The copy machine has a display for indicating the additional information in the proximity of a glass platen for placing the document. The copy machine is adapted to perform copy operation at least two times so as to form both copy images of the document and the additional information on the same copy sheet.

Abstract: In an electrostatic latent image developing toner which comprises spherical core particles composed of at least a coloring agent and a thermoplastic resin and an outer shell layer containing at least a thermoplastic resin and applied in the form of a coating fast to the core particles, the outer shell layer applied in the form of a coating is formed by (a) thermally fixing minute particles of one thermoplastic resin and minute particles of another thermoplastic resin on the surface of the core particles thereby enabling part of the aforementioned other thermoplastic resin to retain the original particulate form thereof intact in the produced coating or (b) thermally fixing minute particles of a thermoplastic resin and minute particles of a thermosetting resin or minute particles of a resin possessing a gelling component in a specific amount on the surface of the core particles thereby enabling the minute particles of the resin to retain the original particulate form thereon intact in the produced coating and

Abstract: Liquid toners for developing electrophotographic images contain dispersed toner particles which are based on a polymer with multi-characteristics. These particles comprise a thermoplastic resinous core with a T.sub.g below room temperature, which is chemically anchored to an amphipathic copolymer steric stabilizer containing covalently attached groups of a coordinating compound which in turn are capable of forming covalent links with organo-metallic charge directing compounds. The toner particles so formed have advantageous properties of high charge/mass, and good charge and dispersion stability.

Abstract: An electrophotographic photoreceptor is disclosed, which comprises an electrically conductive support having thereon a layer which contains a charge carrier transporting compound and a charge carrier generating compound, or a layer which contains charge carrier transporting compound and a layer which contains a charge generating compound, wherein at least one type of tris-azo compound represented by formula (I) is included as a charge carrier generating compound: ##STR1## wherein Ar.sub.1, Ar.sub.2, Ar.sub.3, Ar.sub.4 and A are as defined in the specification.

Abstract: Disclosured is a toner comprising colored particles and a magnetic shell coated thereon, wherein said colored particles are composed of a binder resin and a coloring agent, and said magnetic shell is formed from an iron-oxide type magnetic material. The toner can be fixable at a low temperature or a low pressure, but the toner particles do not agglomerate with each other during long-term storage.

Abstract: The present invention relates to an electrophotographic sensitive member, in particular to an electrophotographic sensitive member capable of enhancing a photosensitivity on both a short wavelength side and a long wavelength side and a charge acceptance and thus suitable for a plain paper copying machine (PPC).The stabilized operation characteristics and durability have been required for an electrophotographic sensitive member drum carried on instruments such as high-speed copying machine and laser beam printer.Amorphous silicon has been watched with interest for this requirement in view of superior abrasion resistance, heat resistance, antipollution property, photosensitivity characteristic and the like.However, such the amorphous silicon photosensitive member shows the higher photosensitivity on the long wavelength side.

Abstract: A toner for development of a latent electrostatic image containing a colorant and a binder resin formed of a mixture of a low-molecular weight component and a high-molecular weight component. Both the low-molecular weight component and high-molecular weight component are made from a styrene-acrylic copolymer where the weight ratio (A) of styrene to acrylic monomer in the low-molecular weight polymer component and an the weight ratio (B) of styrene to acrylic monomer in the high-molecular weight polymer component satisfies the relationship A/B.ltoreq.1.3. The mixing ratio of the low-molecular weight and high-molecular weight components is within the range of from 80:20 to 40:60. The weight-average molecular weight (Mw) and the number-average molecular weight (Mn) of the low-molecular weight polymer component satisfies the relationship Mw/Mn.ltoreq.3.0.

Abstract: A toner composition comprised of resin particles, pigment particles, charge enhancing additive, and a mixture of a charge enhancing additive and a wax component comprised of an alkylene, or polymeric alcohol of the formulaCH.sub.3 (CH.sub.2).sub.n CH.sub.2 OHwherein n is a number of from about 30 to about 300.

Abstract: A printing member for electrostatic photocopying, comprises a substrate having a conductive surface and a photoelectric-sensitive, electrically chargeable layer deposited on the conductive surface of the substrate. The electrically chargeable layer has a non-single crystal semiconductor layer having a build-in-potential, or the non-single crystal semiconductor layer and an insulating or semi-insulating layer.

Abstract: A photoconductor element which employs a solvent soluble polyimide as the polymeric binder in at least one layer thereof. The polyimide is characterized by the formula: ##STR1## where R is a dianhydride and n is an integer in the range of 50 to 450.

Abstract: An organic photoconductor comprising an electrically conducting support, a charge generation layer containing dibromoanthanthrone and a charge transport layer containing a di- or triarylmethane compound of the formula: ##STR1## wherein R.sup.1 represents hydrogen or an optionally substituted alkyl, alkenyl, cycloalkyl, cycloalkenyl, aralkyl or aryl radical;each of R.sup.2, R.sup.3, R.sup.4 and R.sup.5, independently, represent hydrogen or an optionally substituted alkyl, alkenyl, cycloalkyl, aralkyl or aryl radical, or R.sup.2 and R.sup.3 together with the attached nitrogen atom and R.sup.4 and R.sup.5 together with the attached nitrogen atom may form heterocyclic rings; andeach of R.sup.6, R.sup.7, R.sup.8 and R.sup.

Abstract: An electrophotographic recording element comprising a combination of photoconductive perylene materials that are dispersed in a binder to form layers having excellent photosensitivity and resistance to abrasion. The materials are perylene-3,4,9,10-tetracarboxylic acid imide derivatives that contain a phenethyl radical bonded to a 3,4-dicarboximide nitrogen atom.

Abstract: There are provided binder resins for use in toner compositions which comprise, as the main component thereof, a terminally blocked polyester in which the terminal hydroxyl groups of polyester polyol molecules are blocked by a rosin compound selected from the group consisting of rosin, hydrogenated rosin and disproportionated rosin and which has an acid value of not more than 4 KOH mg/g and a hydroxyl value of not more than 20 KOH mg/g as well as toner compositions comprising them in combination of a coloring agent and a charge control agent.

Abstract: Resinous microparticles useful in toner for electrophotography which are made of vinyl resin obtained by emulsion polymerization of at least one .alpha.,.beta.-ethylenically unsaturated monomers in the presence of cationic surfactant having an onium salt structure and a polymerization initiator having an amidine or amidine salt structure and whose average particle diameter is in a range of from 0.01 to 1.mu., and toner composition comprising toner particles and resinous microparticles as abovementioned are provided.

Abstract: An electrophotographic photoreceptor comprising a support having provided thereon at least one photoconductive layer containing at least an inorganic photoconductive substance and a binder resin is disclosed, wherein said binder resin contains (A) a resin having at least one kind of acidic group selected from the group consisting of --PO.sub.3 H.sub.2, --SO.sub.3 H, and --COOH at the terminal end of the main chain of the resin. The photoreceptor exhibits excellent electrostatic characteristics, image formation performance as well as printing suitability irrespective of change in environmental condition or the kind of sensitizing dyes to be used in combination with the photoreceptor.