Patent ID: 6582869
Filing Date: 2003-06-24
Classification: G03G

Abstract:
An electrophotographic toner comprising a binder resin and a colorant, the binder resin including a crystalline polyester resin which comprises, as a copolycondensation component, a dicarboxylic acid including a sulfonic acid group and/or a diol including a sulfonic acid group as a main component, and an ester density M of the crystalline polyester resin, which is defined in Formula 1 as follows, being from 0.01 to 0.12:M=K/Aâ€ƒâ€ƒFormula 1 wherein M denotes the ester density, K denotes a number of ester groups in a polymer, and A denotes a number of atoms constituting a chain of the polymer, including oxygen atoms which relate to the ester linkage but not including branched chains, hydrogen atoms, and other substituents bonded to the chain of the polymer, andwherein the toner has a temperature interval in which values of a storage modulus GL and a loss modulus GN change to one hundredth or smaller of the original values at a temperature range of 10Â° C. when the temperature of the toner is raised.