Patent ID: 8512926
Filing Date: 2013-08-20
Classification: G03G

Abstract:
1. An electrophotographic toner comprising: a crystalline polyester resin; a non-crystalline polyester resin; a colorant; and a releasing agent, a weight-average molecular weight of the crystalline polyester is from about 15,000 to about 25,500, the non-crystalline polyester resin comprising a non-crystalline polyester resin having a weight-average molecular weight of about 9,000 to about 20,000 as measured by gel permeation chromatography and having an acid value of about 13 mgKOH/g to about 20 mgKOH/g, and a non-crystalline polyester resin having a weight-average molecular weight of about 25,000 to about 55,000 as measured by gel permeation chromatography and having an acid value of about 10 mgKOH/g to about 15 mgKOH/g, the non-crystalline polyester resin comprising a resin fraction (i) and a resin fraction (ii), wherein: the resin fraction (i) is included in a toluene-soluble component of the toner and is collected as a resin in a fraction having a molecular weight of about 30,000 to about 100,000 relative to polystyrene standards by separating treatment by gel permeation chromatography, and has an acid value A; and the resin fraction (ii) is included in the toluene-soluble component of the toner and is collected as a resin in a fraction having a molecular weight of about 8,000 to about 12,000 relative to polystyrene standards by separating treatment by gel permeation chromatography, and has an acid value B; the crystalline polyester resin comprising a resin fraction (iii) that is included in a toluene-insoluble component of the toner and has an acid value C, and the acid values A, B, and C satisfying the inequation of B>A>C.