Fuji Photo Film Company, Limited

Keitaro Ohe

Nobuo Tsuji

Fumiyuki Suzuki

Toshimitu Okutu

Daijiro Nishio

Kenji Naito

Shigeru Sadamatsu

Hiroyuki Kaneko

One can obtain finely divided polymer particles by dissolving a polymer in a water immiscible volatile solvent which has a boiling point lower than that of water, then dispersing the solution into an aqueous medium, and removing the solvent from the dispersed oil phase droplets.

Method of producing finely divided polymer particles

A process for preparing bis(hydroxyethyl)terephthalate and its low molecular weight oligomers in a reactor equipped with a rectifying column which comprises suspending or dissolving terephthalic acid in molten bis(hydroxyethyl)terephthalate and its low molecular weight oligomers at a temperature above the dew point of ethylene glycol and feeding gaseous or liquid ethylene glycol into the suspension or the solution to react it with the terephthalic acid, where the amount of ethylene glycol fed into the reactor is controlled so as to maintain the temperature inside the rectifying column at a temperature at which the ethylene glycol does not substantially distill off from the rectifying column and the partial pressure of the ethylene glycol is maximized.

Process for preparing polyethylene terephthalate and its low molecular

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

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Odawara, Japan

Keitaro Ohe