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US 2008/0187856 A1Published application
Toner Formulation For Controlling Mass Flow
AssigneeLexmark International, Inc.
InventorsScott Moreland Broce, Robert Joseph Firmature, Yueping Fu, Matthew David Heid, Lance Tisdale Hoshiko, James Craig Minor, Karen Eileen Zrebiec
Life of this patent
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Abstract
The present invention relates to controlling the mass flow of toner in an image forming device or a toner cartridge. The toner composition includes extra particulate additives including a conductive additive. The extra particulate additives may also include relatively small silica particles or relatively large silica.
Claims24
A toner composition comprising:
- toner particles having a size of about 1-25 μm;
- silica particles having an average diameter D1 and an average diameter D2 wherein D1<D2;
- and
- conductive additive having a volume resistivity in the range of about E−6 to E6 ohm-cm wherein said conductive additive is present at a concentration to provide a mass flow of about 0.2 to 1.5 mg/cm2.
1 more element
A method for controlling the mass flow of toner having particle size of about 1-25 μm comprising:
- mixing said toner with a conductive additive, wherein said conductive additive has a volume resistivity in the range of about E−6 to E6 ohm-cm and wherein said conductive additive is combined with said toner at a concentration to provide a mass flow of about 0.2 to 1.5 mg/cm2.
Dependencies are inferred from the claim text.