Abstract: The invention presents an electrophotographic photosensitive material possessing a surface layer excellent in wear resistance, without adversely affecting the photosensitive characteristics, wherein a photosensitive layer and a surface protective layer containing a thermoset silicone resin are laminated in this order on a substrate surface, and the silicone resin of the surface protective layer is hardened by a hardening catalyst mainly composed of a compound of the general formula (I) or an acid salt thereof which is selected from the group consisting of: a phenol salt, an octylic acid salt, a p-toluenesulfonic acid salt and a formic acid salt ##STR1##

Abstract: A liquid developer composition comprised of aliphatic hydrocarbon insoluble polyolefin resin particles, a hydrocarbon carrier liquid, dye or dyes which are soluble in the resin, and insoluble in the liquid, and a charge director.

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, wherein said binder resin comprises at least one copolymer resin comprising a monofunctional macromonomer (M) and a monomer (A), said monofunctional macromonomer (M) having a weight average molecular weight of not more than 2.times.10.sup.4 and containing at least one polymerization component represented by formula (II-a) or (II-b): ##STR1## wherein X.sub.0 represents --COO--, --OCO--, --CH.sub.2 OCO--, --CH.sub.2 COO--, --O--, --SO.sub.2 --, --CO--, ##STR2## wherein R.sub.1 represents a hydrogen atom or a hydrocarbon group; Q.sub.0 represents an aliphatic group having from 1 to 18 carbon atoms or an aromatic group having from 6 to 12 carbon atoms, said carbon numbers not inclusive of substituents; b.sub.1 and b.sub.

Abstract: An encapsulated toner composition comprised of a core comprised of pigments or dyes, and a polysiloxane-incorporated core binder resin, which core is encapsulated in a shell.

Abstract: Photohardenable electrostatic master with improved environmental latitude comprising(1) an electrically conductive substrate, and(2) a layer of photohardenable composition consisting essentially of(a) at least two organic polymeric binder, at least one having a Tg greater than 80.degree. C. and at least one having a Tg less than 70.degree. C.,(b) at least one monomeric compound having at least one ethylenically unsaturated group, and(c) a photoinitiator or photoinitiator system, the shift in transit time (a.sub.T) of the photohardenable layer in the range of 30%.ltoreq.relative humidity.ltoreq.60% and 15.6.degree. C..ltoreq.temperature.ltoreq.26.7.degree. C. is 15 or less, preferably 10 or less. A xeroprinting process is described using the master. The master is used in graphic arts, color proofing which duplicates images produced by printing, preparation of printed circuit boards, resists, soldermasks, etc.

Abstract: A printing plate precursor for electrophotographic printing plate making purposes wherein the binder resin used for a photoconductive layer comprises a copolymer of at least one vinyl ester compound or allyl ester compound having an aromatic ring as a monomer component and at least one vinyl polymerizable monomer containing at least one acidic functional group as a monomer component.

Abstract: A positive-working electrostatic liquid developer consisting essentially of (A) a nonpolar liquid having a Kauri-butanol value of less than 30, present in major amount, (B) thermoplastic resin particles, less than 10 .mu.m average by area particle size, (C) a nonpolar liquid soluble ionic or zwitterionic charge director compound, and (D) a substituted carboxylic acid or salt adjuvant as defined. Component (D) can be present in liquid (A) or dispersed in the resin particles. The process of preparation of the electrostatic liquid developer is described. The liquid developers are useful in copying, color proofing including digital color proofing, lithographic printing plates and resists.

Abstract: Disclosed is an electrophotographic photoreceptor in which an organic lubricant is provided on the surface of an organic photoconductive layer or on a protective layer formed on the organic photoconductive layer. Elements of the organic lubricant are partly exposed from the surface of the organic photoconductive layer or the protective layer while the remainder portions of the elements are embedded or fixed by chemical reaction in the surface region of the photoconductive layer or the protective layer so that the exposed portions of the elements of the organic lubricant provides a lubricating surface layer. The lubricating surface layer supresses wear of the photoreceptor thereby enabling the photosensitive layer to withstand a long repeated use without impairing electrophotographic characteristics.

Abstract: Disclosed is a positively chargeable toner comprising, as a charge-controlling agent, an acid adduct, metal complex or derivative of a 2-alkylimidazole represented by the following formula: ##STR1## wherein R.sub.2 stands for an alkyl group having 11 through 17 carbon atoms, and R.sub.4 stands for a hydrogen atom or a methyl group.In this toner, a high charge-controlling effect is attained with a small amount of the charge-controlling agent, and since the charge-controlling agent has a white color or light color, this toner is advantageously used as an electrostatic photographic toner for the color printing.

Abstract: A process for replenishing a liquid developer, and a liquid developer made by the process, comprising transferring a first composition comprising a carrier liquid and a charge director into the liquid developer and transferring a second composition comprising toner particles, carrier liquid and charge director into the liquid developer. The amount of charge director in each of the first and second compositions charge director is in a predetermined ratio which results in a constant level of charge director in the liquid developer when the liquid developer is utilized in an electrostatic or printing process.

Abstract: An electrophotographic photoreceptor composition comprises in sequence:(a) a conductive base layer;(b) a carrier transport layer comprising an organic carrier transport material;(c) a carrier generation layer comprising an organic carrier generation material; and(d) a surface protective layer characterized by having a transmissivity not exceeding 50% for light having a wavelength of 405 nm or less. The composition is advantageous in that it is capable of being employed in conjunction with a positive electrification method in electrophotographic image formation, and in that it exhibits enhanced resistance to fatigue from light exposure.

Abstract: This invention relates to a developer for developing electrostatic latent images formed on an electrostatic latent image carrier, which comprises a toner including;a resin,a colorant, andan inorganic fine particle with at least both a negatively chargeable polar group and a positively chargeable polar group on the surface of the inorganic fine particle.

Abstract: The present invention relates to a developer such as a toner and/or carrier for use in electrophotographic developing processes, and more specifically relates to a developer containing halogenated amorphous carbon particles prepared by plasma-polymerization, wherein the particles may take two forms, i.e., one with seed particles which is coated with the plasma-polymerized film containing at least carbon and halogen or the other without the seed particles which is formed by plasma-reacting carbon and halogen.

Abstract: Process for preparation of high resolution image exposing imagewise a photopolymerizable element having a removable cover sheet and a conductive support or a temporary support which is replaced by a conductive support, stripping the cover sheet and laminating the imagewise exposed photopolymerizable layer to a second exposed photopolymerizable layer on a temporary support, removing the temporary support, charging electrostatically the exposed photopolymerizable layers, developing, e.g., liquid electrostatic developer or dry toner developer, and optionally transferring the developed image to a receptor surface, e.g., paper. The process is useful in preparing multiple copies in more than one version, e.g., logos, headlines, corrections, etc.

Abstract: A developer for developing electrostatic images, comprising a magnetic toner comprising a binder resin and magnetic powder, the developer containing 17-60% by number of magnetic toner particles of 5 microns or smaller, containing 1-23% by number of magnetic toner particles of 8-12.7 microns, and containing 2.0% by volume or less of magnetic toner particles of 16 microns or larger; wherein the magnetic toner has a volume-average particle size of 4-9 microns, and the magnetic toner particles of 5 microns or smaller have a particle size distribution satisfying the following formula:N/V=-0.04N+k,wherein N denotes % by number of magnetic toner particles of 5 micron or smaller, V denotes % by volume of magnetic toner particles of 5 microns or smaller, k denotes a positive number of 4.5-6.5, and N denotes a positive number of 17-60.