摘要:
An electrophotographic photosensitive element having a conductive support provided thereon with a photosensitive layer comprising a carrier-generating phase and a carrier-transporting phase. The carrier-transporting phase comprises a hydrazone compound to improve carrier-transporting ability having the formula ##STR1## wherein, X and Y each represent a hydrogen or a halogen, R.sub.1 and R.sub.2 each represent an aryl group which may have a substituent or substituents, and Ar represents an arylene group which may have a substituent or substituents.
摘要:
An electrophotographic photosensitive element having a conductive support provided thereon with a photosensitive layer comprising (i) a carrier-generating phase layer containing a carrier-generating material selected from the group consisting of perylene dyes, polycyclic quinones and azo dyes and (ii) a carrier-transporting phase layer containing a carrier-transporting material wherein said carrier-transporting phase comprises a hydrazone compound represented by the formula ##STR1## wherein R.sub.1, R.sub.2, R.sub.3 and R.sub.4 each represent an aryl group which may have a substituent or substituents, and Ar represents an arylene group which may have a substituent or substituents.
摘要:
A silver halide photographic material having a hydrophilic colloid layer comprising fine polymer particles loaded with a hydrophobic photographic addenda provided on a support wherein the polymer has repeating units formed from a nonionic hydrophobic monomer. The nonionic hydrophobic monomer has the formula ##STR1## R.sub.1 and R.sub.2 individually are a hydrogen atom or methyl group, R.sub.3 is a hydrogen atom, an alkyl or aryl group, and m and n are integers of from 2 to 100 individually.
摘要:
Toner for developing electrostatically charged images comprising nuclear particles formed by polymerization, hydrophobic silica, and a resin, wherein said resin is coated on said nuclear particles and said silica is dispersed in said resin. A method for producing said toner is also disclosed, said method comprising polymerizing nuclear particles, dissolving a resin in a solvent, which asserts a lesser solvating action against said nuclear particles than against said resin, to form a solution, dispersing said hydrophobic silica in said solution, mixing said nuclear particles with said dispersion, and drying said mixture.
摘要:
A toner composition in particle form for electrophotography comprising an inorganic material powder, e.g., a magnetic material, which is dispersed together with other additives in a binder resin toner composed of a polymer obtained by polymerizing a polymerizable monomer, e.g., a vinyl monomer, in the presence of a titanate coupling agent.
摘要:
The invention relates to a method for producing a toner by polymerizing an aqueous suspension of a monomer in the presence of a dispersant selected from orthophosphate, pyrophosphate and polyphosphate, a colorant and an anionic surfactant. The polymerization product is then treated with dilute acid and rinsed with water whereby the dispersant is removed from the polymerization product.
摘要:
A process for manufacturing towers and their use in developing an electrostatically charged image comprising polymerized grains formed by the suspension polymerization of an alpha-beta unsaturated polymeric monomer or monomers in the presence of a dispersion stabilizer selected from the group consisting of aluminum hydroxide, ferric hydroxide titanium hydroxide and thorium hydroxide.
摘要:
Gelatin, particularly gelatin films of light-sensitive silver halide photographic materials, are hardened by treating with a combination of a compound having at least two vinylcarbonyl groups in the molecule with a compound having at least two vinylsulfonyl groups in the molecule.
摘要:
A developer for developing an electrostatic latent image comprising colored electroscopic particles and at least one silicon dioxide powder having its particles made hydrophobic with a specified organosilicon compound is disclosed. Silicon atoms in said organosilicon compound are bonded to silicon atoms on the surface of individual silicon dioxide particles through oxygen atoms. At least one organic group in the organosilicon compound has a total carbon number of 8 or more and is a saturated or unsaturated aliphatic organic group with at least 5 carbon atoms or an organic compound having a hydrocarbon ring. In a preferred embodiment, such a silicon dioxide powder is used in combination with another silicon dioxide powder whose particles are rendered hydrophobic by an organosilicon compound wherein any of the organic groups present has a total carbon number of 7 or less and is a saturated or unsaturated organic group with not more than 4 carbon atoms or an organic group having a hydrocarbon ring.
摘要:
An electrostatic image developing toner comprising polymer particles produced by suspension polymerization of a polymerizable monomer in the presence of an emulsification-preventing agent. Such toners produce images of high image density.