RESIN COMPOSITION FOR TONER AND TONER

摘要

PROBLEM TO BE SOLVED: To provide a resin compsn., for producing a toner for heat roll fixation ensuring a wide fixing temp. range and having well-balanced balanced resistance and fixability and to provide a toner using the resin compsn. SOLUTION: This resin compsn. for toner is based on a vinyl copolymer contg. at least a low mol.wt. polymer component having the max. value in its mol.wt. distribution within then mol.wt. range of 3×10<3> to 5×10<4> and a high mol. wt. polymer component having the max. value in its mol.wt. distribution within the mol.wt. range of 3×10<5> to 5×10<6> . The acid value of the high mol.wt. polymer component is >=10KOHmg/mg and is higher than that of the low mol.wt. polymer component. At least the high mol.wt. polymer component in the vinyl copolymer has been block-copolymerized with a vinyl monomer having an acid group.