Patent ID: 7547500

Claim:
A binder resin for an electrostatic image developing toner, obtained by polycondensation reaction of a polycarboxylic acid and a polyol, wherein the polycarboxylic acid comprises at least one of a compound represented by formula (1) and a compound represented by formula (2) in an amount of from 50 to 100 mol %, the polyol comprises a compound represented by formula (3) in an amount of from 50 to 100 mol %, and a content of a catalyst-originated metal element in the resin is 100 ppm or less: R 1 OOCA 1 m B 1 n A 1 l COOR 1′ (1) (wherein A 1 is a methylene group, B 1 is an aromatic hydrocarbon group, R 1 and R 1′ each is a hydrogen atom or a monovalent hydrocarbon group, 1≦m+l≦12, and 1≦n≦3); R 2 OOCA 2 p B 2 q A 2 r COOR 2′ (2) (wherein A 2 is a methylene group, B 2 is an alicyclic hydrocarbon group, R 2 and R 2′ each is a hydrogen atom or a monovalent hydrocarbon group, 0≦p≦6, 0≦r≦6, and 1≦q≦3); HOX h Y j X k OH (3) (wherein X is an alkylene oxide group, Y is a bisphenol structure group, 1≦h+k≦10, and 1≦j≦3).