| abstract |
Provided is a toner binder which attains all of low-temperature fixing properties, gloss, and hot offset resistance and gives a toner that satisfies flowability, high-temperature storability, charge stability, pulverizability, image strength, flex cracking resistance, and document anti-offset properties. The present invention is a toner binder which comprises a polyester resin and has a surfactant content of 100 ppm or less and in which the THF-insoluble components and the THF-soluble components respectively have a storage modulus (Pa) at 150ºC, G'x150, and a storage modulus (Pa) at 150ºC, G'y150, which satisfy the following relationships (1) and (2).nG' x150 ≥10,000 (1)nG' x150 /G' y150 ≥500 (2) |