Abstract: Preparation of biopolymer crystals is made automatic by an apparatus comprising a reactor system, a solution liquid supply system, temperature control system, and a control unit controlling the supply system and the temperature control system, and preferably, an image recording system.

Abstract: A process for preparing a developer for electrostatic images comprising: (1) immersing carrier beads in an organic solution of a resin material comprising a 1,2-butadiene or cyclized cis-1,4-butadiene homopolymer, or a mixture of at least one of the homopolymers and a styrene butadiene copolymer; evaporating the organic solvent of the solution, drying the immersed beads, and curing the resin material by a rotary drying method, to form a resin coating on the carrier beads; (2) blending toner materials at a temperature sufficient to form a toner mass, the toner materials comprising: (a) a binder resin, (b) a colorant, and (c) a charge controlling agent; and (3) pulverizing the blended toner mass to form toner particles and mixing the obtained toner particles with the coated carrier in a predetermined ratio of the total surface area of the carrier to the total projection area of the toner particles.

Abstract: A developer material for electrostatic images comprising a mixture of (1) a coated carrier and (2) a toner.(1) The carrier consists of core beads coated with a coating resin comprising a butadiene homopolymer of a molecular weight of from 10,000 to 100,000, for the butadiene homopolymer is 1,2-polybutadiene and/or cyclized cis-1,4-polybutadiene or a mixture of at least one of these homopolymers and a styrene/butadiene copolymer of a molecular weight of from 10,000 to 100,000, the mixture containing from 7.5 to 100% by weight, based on the weight of the mixture, of butadiene in polymerized form.

Abstract: A process for preparing a developer material for electrostatic images comprising a mixture of (1) a coated carrier and (2) a toner by a rotary drying method.(a) The carrier consists of core beads coated with a coating resin comprising a butadiene homopolymer of a molecular weight of from 10,000 to 100,000, for the butadiene homopolymer is linear 1,2-polybutadiene and/or cyclized as-1,4-polybutadiene or a mixture of at least one these homopolymers and a styrene/butadiene copolymer of a molecular weight of from 10,000 to 100,000, the mixture containing from 7.5 to 100% by weight, based on the weight of the mixture, of butadiene in polymerized form.

Abstract: A photosensitive material for electrophotography is provided which has a very high sensitivity to rays having a wavelength included in the oscillation wavelength region of a laser printer, especially a semiconductor laser printer, and which also has a high charge potential. This photosensitive material comprises a phthalocyanine pigment, poly-N-vinylcarbazole, and an organic resin in which said phthalocyanine pigment and poly-N-vinylcarbazole are dispersed, wherein the weight ratio of phthalocyanine pigment to poly-N-vinylcarbazole is in the range of from 1.2 to 12 and the content of the organic resin is 35% to 70% by weight based on the total amount of the photosensitive material.

Abstract: A photosensitive material for electrophotography having an improved photosensitivity is provided, which comprises copper phthalocyanine as a photoconductor, 2,5-bis(4'-diethylaminophenyl)-1,3,4-oxadiazole as a charge transport material and a binder resin in which said photoconductor and charge transport material are dispersed. The content of the binder resin is 50 to 70% by weight based on the total amount of the photosensitive material and the weight ratio of copper phthalocyanine to 2,5-bis(4'-diethylaminophenyl)-1,3,4-oxadiazole is in the range of from 2.5 to 6.5.

Abstract: An electrophotographic process is provided wherein an electrostatic latent image is developed with finely divided toner particles and then the developed image is fixed by irradiating it with high energy ultraviolet rays or visible light. The toner particles used consist essentially of, based on the weight of the toner particles, (a) 62-99.4 wt. % of a binder resin substantially consisting of a bisphenol A/eplchlorohydrin type epoxy resin having a melting point of 60.degree.-160.degree. C., an epoxy equivalent of about 450-5,500 and a Mw of about 900-8,250, (b) 0.6-8 wt. % of carbon, (c) 0-5 wt. % of a dye and, optionally, (d) 0-20 wt. % of a montanic acid ester wax.