US Patent 7504189 Chemically prepared toner and process therefor
Patent 7504189 was granted and assigned to Lexmark International, Inc. on March, 2009 by the United States Patent and Trademark Office.
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A method for making toner particles having reduced toner charge transfer sensitivity when used in electrophotographic printers. The method includes preparing a dispersion of pigment, a fuser release agent, and a polymeric dispersant. The polymeric dispersant has a hydrophilic polymeric segment and at least one segment selected from the group consisting of a protective colloid segment and reactive surfactant segment. The polymeric dispersant also has a weight average molecular weight ranging from about 5,000 to about 30,000 as determined by gel permeation chromatography, and a hydrophobicity ranging from about 10 to about 90 percent by weight. The dispersion is mixed with a latex binder dispersion to provide a toner mixture. The toner mixture is agglomerated while stirring the mixture at an elevated temperature to provide toner particles.
US Patent 07504189 Chemically prepared toner and process therefor US Patent 7504189 Chemically prepared toner and process therefor
US Patent 07504189 Chemically prepared toner and process therefor
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