Micro-serrated particles for use in color toner and method of making same
AssigneeDPI Solutions, Inc.
InventorsChul-Hwan Kim, Seung-Wook Lim, Tae-Ho Park, Hyun-Nam Yoon
Life of this patent
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Abstract
A particulate composition suitable for making color toner includes resin particles optionally containing a charge control agent. The particles are characterized by a micro-serrated surface exhibiting a surface roughness index of at least about 1.2 and preferably higher. A process for making the particulate composition utilizes a vaporizable plasticizer.
Claims48
A particulate composition comprising resin particles formed of a resin component and optionally containing a charge control agent, said resin particles being suitable for making color toner and characterized in that said particles are provided with a micro-serrated surface such that said particles exhibit a surface roughness index of greater than about 1.2
A particulate resin composition suitable for production of particulate toner composition comprising resin particles optionally containing a charge control agent, wherein said particles are substantially spherical in shape, have an average diameter of from about 1 to 10 microns, with the span value less than 1.0 and are prepared by way of comminuting a precursor resin composition comprising a vaporizable plasticizer component in an organic medium under shear at elevated temperature wherein said particles are substantially insoluble in said organic medium.
A particulate resin composition comprising a polyester resin component wherein the particles are substantially spherical in shape and have a volume average diameter in the range of from about 1 to about 10 microns with the span value less than 1.0 wherein said polyester resin component comprises a polyester resin having a weight average molecular weight of about 100,000 g/mol or less.
A particulate resin composition comprising a styrene copolymer resin component wherein the particles are substantially spherical in shape and have a volume average diameter in the range of from about 1 to about 10 microns with the span value less than 1.0 and wherein said styrene copolymer resin component comprises a styrene copolymer having a weight average molecular weight of about 100,000 g/mol or less.
A process for preparing a finely divided, comminuted particulate resin composition suitable for production of particulate toner composition for developing latent electrostatic images comprising:
- (a) preparing a first resin composition comprising a resin component, provided with functional sites suitable for interacting with functionalized dyes, a vaporizable plasticizer component and optionally a charge control agent.
- (b) dispersing said first resin composition in an organic medium comprising an organic solvent component and a surfactant, said resin being substantially insoluble in said organic medium;
- (c) comminuting said first resin composition in said organic medium by way of application of shear thereto at an elevated temperature;
- (d) removing said vaporizable plasticizer component from said comminuted resin particles by evaporating said vaporizable plasticizer component at an elevated temperature;
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- (e) recovering said comminuted particulate resin composition from said organic medium.
Dependencies are inferred from the claim text.