Toner for developing an electrostatic image
AssigneeMinolta Co., Ltd.
InventorsMasahiro Anno, Tetsuo Sano, Kenichi Kido, Hiroyuki Fukuda
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Abstract
A toner is provided for developing an electrostatic image which has relatively high roundness, uniform shape, excellent property of electrification, electrification stability, maintenance of heat resistance, fixability, image quality and productivity, and is effective for full-color image formation, cleanerless system and toner-recycling system. The toner comprises toner particles containing a binder resin (A), a polymer (B) and a colorant, the polymer (B) having weight-average molecular weight of 1000-3000 and a ratio of weight-average molecular weight/number-average molecular weight of not more than 2.0, wherein the polymer (B) particles exist on surfaces of the toner particles.
Claims20
A toner for developing an electrostatic image which comprises toner particles containing a binder resin (A), a polymer (B) and a colorant, the polymer (B) having weight-average molecular weight of 1000-3000 and having a ratio of weight-average molecular weight/number-average molecular weight being not more than 2, wherein polymer (B) particles are more densely dispersed in surface regions of the toner particles in comparison with central parts of the toner particles.
A toner for developing an electrostatic image which comprises toner particles containing a binder resin (A), a polymer (B) and a colorant, the polymer (B) having weight-average molecular weight of 1000-3000 and having a ratio of weight-average molecular weight/number-average molecular weight being not more than 2, wherein a content of the polymer (B) is 2-15 parts by weight in relations to 100 parts by weight of the binder resin (A), and polymer (B) particles having average dispersion particle size of 0.08-1.5 μm are dispersed in the toner particles having volume-average particle size of 5-8 μm, wherein the polymer (B) paricles are more densely dispersed in surface regions of the toner particles in comparison with central parts of the toner particles.
A toner of claim 13, wherein the content of the polymer (B) is 2.5-10 parts by weight in relations to 100 parts by weight of the binder resin (A).
Dependencies are inferred from the claim text.