Patent ID: 6074796
Filing Date: 2000-06-13
Classification: C08J,G03G

Abstract:
A process for producing a binder resin for a toner comprising the steps of:(1) stirring together until uniformly dispersed, a mixture of a first component of the binder resin and second component of the binder resin, the first component of the binder resin being a melted and substantially solventless styrene resin (A) and the second component of the binder resin being an emulsion of a styrene resin (B) different from the first styrene resin (A), the styrene resin (A) having a weight average molecular weight of 1,000 to 50,000 and being a polymer prepared by bulk polymerization at a temperature of not lower than 100.degree. C. and the styrene resin (B) having a weight average molecular weight of more than 50,000 and being a polymer prepared by emulsion polymerization;(2) evaporating water from the mixture of the two styrene resins during or after step (1); and(3) reducing a water content of the evaporated mixture to not more than 1% by weight by kneading the mixture.