Mitsubishi Rayon Company, Limited

Yoichi Nagai

Noriyuki Tajiri

Shinji Kubo

Hitoshi Iwasaki

Yasuo Hiromoto

Hirotoshi Mizota

Hisaaki Yoshimura

Hiroyuki Kumaoka

Takeshi Kato

Yoshihide Nagafuchi

Tatsuki Yajima

A vinyl-based polymer having a mass average molecular weight of 1500 to 10000, which is prepared by a first step of continuously feeding a material mixture containing a vinyl-based monomer to a continuous tank type first reactor, and polymerizing the vinyl-based monomer under the conditions of a polymerization temperature of 150&#xb0; to 300&#xb0; C. and a retention time of 1 to 60 minutes at a rate of polymerization of 50 to 99% to obtain a reaction intermediate mixture; and a second step of feeding a polymerization initiator in the amount of 0.01 to 5 parts by mass based on 100 parts by mass of the vinyl-based monomer and the reaction intermediate mixture to a second reactor, and further polymerizing the vinyl-based monomer under the conditions of a polymerization temperature of 100&#xb0; to 200&#xb0; C. and a retention time of 10 to 240 minutes at a rate of polymerization of 80% or more.

Vinyl polymer, process for producing vinyl polymer, thermosetting coating composition, and coating material

A polyester resin for toner comprising an acid component containing at least one selected from the group consisting of aromatic dicarboxylic acids and their lower alkyl esters, and an alcohol component containing at least one selected from the group consisting of bisphenol A derivative diols, wherein the content of aldehyde compounds, their decomposition products and by-products in the polyester resin is no more than 200 ppm. Toner polyester resins and toners are obtained which do not generate irritating odors even upon melting and kneading during the toner production or upon heating during the copying process, which provide clear images with no haziness due to reduced light permeability of the copy material, which have a wide range of color tone reproduction, and which provide excellent image precision on copied print.

Polyester resin for toner, process for its production and toner

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Toyohashi, Japan

Yoichi Nagai