Patent ID: 6485875
Filing Date: 2002-11-26
Classification: G03G

Abstract:
A toner, comprising: at least a binder resin, a colorant and a wax, whereinthe 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 a molecular weights of below 1Ã—104 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 a molecular weight of at least 1Ã—104 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: 0.1Ã—W2<W2âˆ’W1<0.5Ã—W2, 0&lE;W1<30, 02<50, and W2>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 1Ã—104, 25-50 wt. % (M2) of a component having molecular weights of 1Ã—104-5Ã—104, 2-25 wt. % (M3) of a component having molecular weights of above 5Ã—104, and below 10 wt. % (M4) of a component having molecular weights of at least 10Ã—104, M1, M2 and M3 satisfying the following relationship: M1&gE;M2>M3.