Patent ID: 8815488
Filing Date: 2014-08-26
Classification: G03G

Abstract:
1. A method for producing a toner comprising melt-kneading a mixture comprising a resin binder and a wax with a twin-screw kneader, wherein the resin binder comprises three kinds of a resin R1, a resin R2 and a resin R3 having different softening points from each other, wherein the resin R1 has a softening point Tm (R1) of from 145° to 160° C., the resin R2 has a softening point Tm (R2) of 122° C. or higher and lower than 145° C., and the resin R3 has a softening point Tm (R3) of 90° C. or higher and lower than 122° C., wherein the wax comprises at least two kinds of a wax W2 and a wax W3 having different melting points from each other, wherein the wax W2 has a melting point Mp (W2) of from 121° to 138° C., and the wax W3 has a melting point Mp (W3) of from 70° to 95° C., wherein Tm (R1), Tm (R2), Tm (R3) and Mp (W2) satisfy the formulas (I) to (3): and wherein the mixture is supplied to the twin-screw kneader in an amount of from 1.3 to 5.0 kg/hr·cm wherein each of the resin R1, the resin R2 and the resin R3 is an amorphous polyester.