Patent ID: 8377619

Claim:
A toner comprising at least a resin and a coloring agent, wherein the resin comprises a polymer in which a polyester resin unit is cross-linked by a diatomic cross-linking group expressed by a following general formula (1): —X 1 Y 1 X 1 — general formula (1): [wherein in the formula, X 1 denotes a linking group; and Y 1 denotes a radical polymer unit having a number average molecular weight Mn ranging from 5000 or more to 50000 or less, and a ratio Mw/Mn ranging from 1.0 or more to 1.2 or less, wherein Mw denotes a weight average molecular weight, and Mn denotes the number average molecular weight], wherein the polyester resin unit has an unsaturated double bond, wherein, the diatomic cross-linking group expressed by the general formula (1) is a telechelic polymer having on both tail ends thereof a vinyl group, and wherein the polyester resin unit and the telechelic polymer are polymerized at the unsaturated double bond of the polyester resin unit and the vinyl group of the telechelic polymer on both tail ends.