Patent ID: 7524603

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