Full-color image forming apparatus with belt-shaped transfer member

A full-color image forming apparatus for forming an image on a transfer material by transferring a toner image formed on an image bearing member onto the transfer material, said apparatus comprising:

• a belt-shaped transfer member for transferring a toner image from the image bearing member onto a transfer material;
• and
• a cleaning blade for cleaning said belt-shaped transfer member by being brought into contact therewith,
• wherein shape coefficients SF-1 and SF-2 of a toner for forming the toner image have values of 100≦SF-1≦125, and 100≦SF-2≦125, respectively,
• wherein said belt-shaped transfer member has a seamless shape in which a seam is absent,
• wherein an amount of abrasion of a surface of said belt-shaped transfer member is equal to or less than 10.0 mg, and
• wherein an angle of contact of a surface of said belt-shaped transfer member with respect to water is at least 60°, and
• wherein a slide resistance of a surface of said belt-shaped transfer member is equal to or less than 1 N.