Patent ID: 7713672
Filing Date: 2010-05-11
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a latent electrostatic image bearing member; a charging unit configured to charge a surface of the latent electrostatic image bearing member; an exposing unit configured to expose the charged surface of the latent electrostatic image to form a latent electrostatic image thereon; a developing unit configured to develop the latent electrostatic image with a toner to form a visualized image; a transferring unit configured to transfer the visualized image onto a recording medium; and a fixing unit configured to fix the visualized image to the recording medium, wherein the toner comprises a binder resin and a coloring agent, and the binder resin comprises a polyester-based resin (A) and a polyester-based resin (B) having a melting point which is at least 10° C. higher than that of the polyester-based resin (A), the polyester-based resin (A) is a resin which is derived from a (meth)acrylic acid-modified rosin and which comprises a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing a (meth)acrylic acid-modified rosin, and the polyester-based resin (B) is a resin which is derived from a fumaric acid/maleic acid-modified rosin and which comprises a polyester unit obtained by condensation polymerization of an alcohol component and a carboxylic acid component containing any one of a fumaric acid-modified rosin and a maleic acid-modified rosin.