Toner for developing latent electrostatic images
AssigneeRicoh Company, Ltd.
InventorHiromitsu Kawase
Life of this patent
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Abstract
A toner having toner particles for developing latent electrostatic images, each toner particle containing a binder resin and a coloring agent, tho binder resin including a vinyl polymer prepared by polymerizing a plurality of different vinyl monomers, with a weight-average molecular weight (Mw) of 30,000 or less, and a peak molecular weight (PMw) of 10,000 or less in the weight-average molecular weight (Mw), with the amount ratio of a vinyl polymer with a molecular weight of not less than the value of PMw.times.10 being in the range of 1 to 30 wt. % of the entire amount of the vinyl polymer.
Claims2
A toner comprising toner particles for developing latent electrostatic images, each toner particle comprising a binder resin and a coloring agent, said binder resin consisting essentially of vinyl polymer prepared by polymerizing a plurality of different vinyl monomers, with a weight-average molecular weight (Mw) of 30,000 or less, and a peak molecular weight (PMw) of 10,000 or less in said weight-average molecular weight (Mw), with the amount ratio of a vinyl polymer with a molecular weight of not less than the value of .alpha. represented by formula (1) being in the range of 1 to 30 wt. % of the entire amount of said vinyl polymer:
- .alpha.=PMw.times.10 (1).
Dependencies are inferred from the claim text.