TONER FOR DEVELOPING ELECTROSTATICALLY CHARGED IMAGE OF HEAT ROLLER TYPE COPIER OR PRINTER

摘要

A hot-roller fixing toner for developing electrostatically charged images which mainly comprises a binder resin, a colorant and a charge control agent, characterized in that the binder resin at least comprises a polyolefin resin having a cyclic structure and contains less than 50 wt.% of a polyolefin resin having a cyclic structure, satisfying the relationships: i.v. (intrinsic viscosity) 0.25 dl/g and HDT (heat deformation temperature according to DIN53461-B) 70 ~C and exhibiting a number-average molecular weight of 7500 or above and a weight-average molecular weight of 15000 or above as determined by GPC. This toner is excellent in fixation, light transmittance and inhibition of spent toner generation and can give clear and high-quality images. Further, the toner is applicable to dry single component type magnetic toners, dry single-component type nonmagnetic toners, dry two-component type toners and liquid toners. In particular, the toner exhibits remarkable effects when used as color toners.