Patent ID: 6010814
Filing Date: 2000-01-04
Classification: G03G

Abstract:
An electrophotographic toner composition comprising toner particles containing a coloring agent, a binder resin and at least two kinds of additives, whereinsaid at least two kinds of additives satisfy a relationship,4<((.di-elect cons..sub.H -.di-elect cons..sub.L)/0.75+log(f))<16,in whichf is 1000, and.di-elect cons..sub.H and .di-elect cons..sub.L are respectively highest and lowest values of dielectric constants at 1 kHz for said at least two kinds of additives,wherein each of said at least two kinds of additives comprises particles of hydrophobic titanium oxide and particles of hydrophobic silicon oxide; andwherein a surface of said particles of hydrophobic titanium oxide is substantially coated with an alkyl alkoxysilane and/or compound represented by a general formula,(C.sub.n F.sub.2n+1).sub.p --Si--(O--C.sub.m F.sub.2m+1).sub.4-p,or with polycondensation products thereof, in which n and m are each a positive integer equal to or larger than 4.