Patent ID: 6248491
Filing Date: 2001-06-19
Classification: G03G

Abstract:
A toner for electrostatic image development, comprising a binder resin and a colorant, said binder resin being made of a polyester resin, wherein the weight-average molecular weight as measured by gel permeation chromatography of a tetrahydrofuran-soluble fraction of said polyester resin contained in the toner is 30,000 or more and the weight-average molecular weight/number-average molecular weight is 12 or more and, moreover, the area ratio of a molecular weight of 600,000 or more is 0.5% or more and the area ratio of a molecular weight of 10,000 or less is within a range of 20-80%, and wherein said toner has a spherical or generally spherical shape having the average circularity of 0.97 or more.