Patent ID: 6610454
Filing Date: 2003-08-26
Classification: G03G

Abstract:
A toner comprising (i) toner particles having a binder resin, a colorant and a wax, and (ii) inorganic fine powder selected from the group consisting of fine silica powder, fine titanium powder and fine alumina powder wherein;said binder resin has a polycarbonate resin in an amount of from 0.1% by weight to 50.0% by weight and a resin other than the polycarbonate resin in an amount of from 50.0% by weight to 99.9% by weight, based on the weight of the binder resin, wherein said polycarbonate resin is continuously present on the surfaces of said toner particles; in molecular weight distribution as measured by gel permeation chromatography of tetrahydrofuran-soluble matter, said toner contains 5.0% by weight or less based on the weight of the toner particles of a component having in its structure a repeating unit of the polycarbonate resin, contained in components having molecular weight of 1,000 or less; the polycarbonate resin has a peak molecular weight in the region of molecular weight from 1,000 to 500,000 and a number-average molecular weight (Mn) of 1,600 to 16,000; and said toner particles have a shape factor SF-1 of from 100 to 160 and a shape factor SF-2 of from 100 to 140 as measured by an image analyzer.