Patent ID: 7033719
Filing Date: 2006-04-25
Classification: G03G

Abstract:
1. A toner, comprising a binder resin and a colorant, and having a plurality of absorption peaks in a wave number range of 400 to 4,000 cm −1 in an infrared absorption spectrum, wherein among the plurality of absorption peaks, a maximum absorption peak appears at wave number ranging from 500 to 800 cm −1 and, given that the intensity of the maximum absorption peak is P1 and that the intensity of a second greatest absorption peak is P2, P1 and P2 satisfy the following equation (1), wherein the binder resin is a styrene-acrylic resin having a weight average molecular weight Mw of 20,000 to 40,000, and a number average molecular weight Mn of 3,000 to 8,000, and wherein the binder resin is prepared by using a chain transfer agent, and the chain transfer agent is selected from an n-alkylmercaptan, a branched alkylmercaptan and an aromatic ring-containing mercaptan which have at least 4 carbon atoms.