Fuji Photo Film Company, Limited

Daijiro Nishio

Mitsugu Tanaka

Atsuaki Arai

Yoshikazu Fujita

Hisao Suzuki

Masashi Ogawa

Naohiko Sugimoto

Masakazu Hashiue

Keitaro Ohe

Shigeru Sadamatsu

Elichi Hasegawa

Hiroyuki Kaneko

An improvement of a medium for electrophoresis which comprises a support of a plastic material and an aqueous polyacrylamide gel, wherein a resin layer comprises a resin having an oxygen permeability coefficient lower than that of the plastic material of the support is arranged betwen the support and the polyacrylamide gel. The resin preferably shows an oxygen permeability of not more than 15 cc/m.sup.2 .multidot.atm.multidot.day in the form of a resinous layer of 20 .mu.m thick, and exemplified by a vinylidene chloride-vinyl chloride copolymer, polyvinyl alcohol, polyacrylonitrile, polyvinylidene chloride, a vinyl alcohol-ethylene copolymer, a vinylidene chloride-acrylonitrile copolymer, and an acrylonitrile-methyl acrylate-butadiene copolymer.

Medium for electrophoresis

A medium for electrophoresis which is substantially free from smiling effect or is reduced in the smiling effect, in which both side portions along the direction of electrophoresis are made thicker than the center portion. A support preferably employed for the preparation of the medium is also disclosed.

Means for electrophoresis showing reduced smiling effect

A process for producing a 3-anilino-5-pyrazolone which comprises reacting a .beta.-anilino-.beta.-alkoxy-acrylate with a hydrazine in the presence of a compound having a pKa of about 8 up to about 14.

Process for producing 3-anilino-5-pyrazolones

This invention is a method for manufacturing an electrophotographic developer for use in electrophotography or electrostatic recording processes. The developer comprises polymer particles by suspension polymerizing, in an aqueous phase, a polymerization liquid comprising at least one polymerizable vinyltype monomer, a polymerization initiator, and a finely divided dispersion stabilizer either sparingly soluble or insoluble in water and said monomer. Said polymerization liquid is blended prior to suspension polymerization. The improvement includes adding to said liquid, a resinous substance, as a fluidizer which is soluble in the monomer and having a solubility parameter in the range of from 7.8 to 16.1. During the blending, the dispersion stabilizer is uniformly dispersed throughout said polymerization liquid. Next, the blended polymerization liquid containing the fluidizer is suspended in the aqueous phase and then such blend is subjected to said suspension polymerization to effect polymer particles having diameters in the range of 0.1 to 100.mu..

Manufacturing method for electrophotographic developing agent

A method for the preparation of a .beta.-anilino-.beta.-hydrazinoacrylate which comprises reacting a .beta.-anilino-.beta.-alkoxyacrylate with a hydrazine. .beta.-Anilino-.beta.-hydrazinoacrylates are valuable intermediates in preparing 3-anilino-5-pyrazolone magenta color-forming couplers and the method of the present invention can be applied particularly to the preparation of 3-anilino-5-pyrazolones which have a hydrophobic group on the anilino group.

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Odawara, Japan

Daijiro Nishio