Toner and resin composition for the toner

A toner is constituted by at least a binder resin, a colorant and a wax. The binder resin has been formed from monomers including a vinyl monomer and polyester-forming monomers containing at least a polybasic carboxylic acid having three or more carboxyl groups or its anhydride, and comprises at least a hybrid resin comprising a vinyl polymer unit and a polyester unit. The toner contains a THF (tetrahydrofuran)-soluble content which includes a first component having molecular weights of below 1x10 containing W1 (mol. %) of the polybasic carboxylic acid and its anhydride based on the polyester-forming monomers contained in the first component and a second component having molecular weight of at least 1x10 containing W2 (mol. %) of the polybasic carboxylic acid and its anhydride based on the polyester-forming monomers contained in the second component, W1 and W2 satisfying the following relationship: 0 W1. The THF-soluble content provides a GPC (gel permeation chromatography) chromatogram including 40 - 70 wt. % (M1) of a component having molecular weights of below 1x10 , 25 - 50 wt. % (M2) of a component having molecular weights of 1x10 - 5x10 , 2 - 25 wt. % (M3) of a component having molecular weights of above 5x10 , and below 10 wt. % (M4) of a component having molecular weights of at least 10x10 , M1, M2 and M3 satisfying the following relationship: M1 >/= M2 > M3.