Patent ID: 9081316
Filing Date: 2015-07-14
Classification: G03G

Abstract:
1. An electrophotographic toner comprising: a binder containing a crystalline polyester resin and an amorphous polyester resin; a colorant; and a releasing agent, wherein the areas and shapes of the crystalline polyester resin domains and releasing agent domains in a total cross-section of toner satisfy the following inequalities (1)-(5), wherein the cross-section of toner is observed by transmission electron microscopy (TEM) after being stained with ruthenium tetraoxide (RuO wherein DS(R) and DL(R) denote the shortest and longest diameters, respectively, of the releasing agent domains; and DS(C) and DL(C) denote the shortest and longest diameters, respectively, of the crystalline polyester resin domains, and wherein R, Rκ, C, C wherein the electrophotographic toner includes iron (Fe) and silicon (Si), wherein the [Si]/[Fe] ratio is in the range of about 5.0×10 wherein the difference between the amorphous polyester resin's acid value (AV) and the crystalline polyester resin's AV satisfies the following inequality (6): wherein the amorphous polyester resin's AV and the crystalline polyester resin's AV means the number of milligrams (mg) of KOH required to neutralize 1 g of each of the amorphous polyester resin and the amorphous polyester resin; and the difference (SPB-SPR) between the solubility parameter of the binder (SPB) and the solubility parameter of the releasing agent (SPR) is about 2 or greater.