Patent ID: 9703218
Date: 2017-07-11
CPC Classifications: C08G,C08L,G03G

Claim:
1. A toner for developing electrostatic images comprising a binder resin consisting of a first resin and a second resin, wherein the first resin is a crystalline polyester resin consisting of a polyester structure formed from a dicarboxylic acid and a dialcohol, wherein the dicarboxylic acid is a linear or branched aliphatic dicarboxylic acid, and the dialcohl is an aliphatic dialcohol, a carbon number (1a) of the dicarboxylic acid in the first resin and a carbon number (1b) of the dialcohol in the first resin have relationships of 4≦1a≦12 and 2≦1b≦12, the second resin is a polyester resin consisting of a crystalline segment and an amorphous segment, the crystalline segment of the second resin is a crystalline polyester segment consisting of a polyester structure formed from a dicarboxylic acid and a dialcohol, wherein the dicarboxylic acid is a linear or branched aliphatic dicarboxylic acid, and the dialcohl is an aliphatic dialcohol, a carbon number (2a) of the dicarboxylic acid and a carbon number (2b) of the dialcohol in the crystalline polyester segment of the second resin have relationships of 4≦2a≦12 and 2≦2b≦12 and also satisfy the relationships of 0≦|1a−2a|≦2 and 0≦|1b−2b|≦2, a weight average molecular weight of the first resin is 5000 to 100000, a weight average molecular weight of the second resin is 5000 to 60000, and a weight average molecular weight of the crystalline segment in the second resin is 200 to 3000.