Patent ID: 6251556
Filing Date: 2001-06-26
Classification: G03G

Abstract:
A toner for developing an electrostatic image comprising a binder resin and a colorant, wherein said binder resin comprises a low molecular weight polymer which is obtained by resin emulsion-polymerizing a mixture of two or more radical-polymerizable unsaturated monomers in the presence or absence of a chain transfer agent and in which a weight average molecular weight is 2,000 to 100,000 and falls in a range shown by the following equation:3.ltoreq.log Mw<1.50-1.18.times.log(S+0.001)wherein Mw represents the weight average molecular weight of the polymer, and S represents an equivalent number of a polyatomic radical part of the chain transfer agent bonded to the end of the polymer chain per 100 g of the polymer, said mixture of monomers containing 0.01 to 20% by weight of radical-polymerizable unsaturated monomer having an acidic polar group, based on the total amount of monomers in the mixture.