Patent ID: 6350551
Filing Date: 2002-02-26
Classification: G03G

Abstract:
A yellow toner comprising fine resin particles and an external additive being added to surfaces of the fine resin particles, wherein said fine resin particles comprise:(a) a resin binder comprising a polyester obtained by polycondensing an alcohol component comprising a compound represented by the formula (I): wherein R1 is an alkylene group having 2 or 3 carbon atoms; each of x and y is a positive number, wherein a sum of x and y is 1 to 16, with a carboxylic acid component comprising a dicarboxylic acid compound and a tricarboxylic or higher polycarboxylic acid compound; (b) a colorant comprising a compound represented by the formula (II): (c) a charge control agent comprising a compound selected from the group consisting of metal compounds of a salicylic acid derivative represented by the formula (III): wherein each of R2, R3, and R4 is independently hydrogen atom, a linear or branched alkyl group having 1 to 10 carbon atoms, or allyl group; M is zinc, zirconium, chromium, aluminum, copper, nickel, or cobalt; m is an integer of 2 or more; and n is an integer of 1 or more; and metal compounds of a benzilic acid derivative represented by the formula (IV): wherein Q is boron or aluminum; m is an integer of 2 or more; and n is an integer of 1 or more; and wherein the external additive comprises silica having an average particle size of from 35 to 350 nm.