Patent ID: 8445170
Filing Date: 2013-05-21
Classification: G03G

Abstract:
1. A binder resin for color toners, wherein the binder resin comprises at least a carboxyl group-containing vinyl resin (C), a glycidyl group-containing vinyl resin (E) and a reaction product thereof, and comprises both a tetrahydrofuran (THF) soluble portion and a THF insoluble gel portion, said THF soluble portion has a main peak in the molecular weight region of not less than 10,000 and less than 15,000 in the chromatogram obtained by gel permeation chromatography (GPC), the content of said THF insoluble gel portion is less than 1 mass %, the softening point is not more than 130 degrees centigrade, the weight-average molecular weight (Mw)/the number-average molecular weight (Mn) is not less than 8, and wherein the storage modulus G′ at 160 degrees centigrade is not less than 50 and less than 1,500 Pa measured at a frequency of 6.28 rad/sec.