Cushman, Darby & Cushman
Polyester resin from tri- or higher polycarboxylic acid for toner and process for its production
 A polyester resin for toner, which consists essentially of (a) from 5 to 60 equivalent %, based on the entire carboxylic acid components, of at least one member selected from the group consisting of tribasic and higher polybasic carboxylic acids, anhydrides thereof and lower alkyl esters thereof, (b) at least one member selected from the group consisting of dicarboxylic acids and lower alkyl esters thereof, (c) at least one aromatic diol and (d) at least one aliphatic diol, and which has a softening temeprature of from 100.degree. to 170.degree. C., a glass transition temperature (Tg) of from 50.degree. to 70.degree. C., an acid value of from 0.5 to 10 mgKOH/g and a gel content of from 3 to 40%. 
Mitsubishi Rayon Company Limited
G C
G03G C08G
inventional inventional
Hitoshi Shinji Hirokazu Noriyuki Ryo
Iwasaki Kubo Ito Tajiri Funato