Patent ID: 6316157
Filing Date: 2001-11-13
Classification: G03G

Abstract:
A non-metallic black toner comprising toner particles containing at least a binder resin, a carbon black and an organometallic compound, and an external additive, wherein:the toner particles contain 10 to 200 ppm of at least one kind of alkali metal element;the toner particles contain at least one kind of organometallic compound selected from organoiron compounds, organoaluminum compounds, organochromium compounds, organozinc compounds, organoboron compounds, and organozirconium compounds;the toner particles contain a polyester resin as a resin component; andthe non-metallic black toner has a weight-average particle diameter of 4 to 11 .mu.m,the following loss tangents tan .delta. shown by dielectric loss factor .di-elect cons.""/dielectric constant .di-elect cons.' at frequencies of 5.times.10.sup.4 Hz and 10.sup.5 Hz:tan .delta. (5.times.10.sup.4 Hz).ltoreq.0.0125tan .delta. (10.sup.5 Hz).ltoreq.0.0105,a Carr's flowability index of 50 or more, anda Carr's floodability index of 65 or more.