Patent application number | Description | Published |
20080268363 | POROUS PARTICLES - The present invention is toner particle that includes a binder resin and nonionic organic polymer particles. The particle has porosity. | 10-30-2008 |
20080268367 | METHOD OF MAKING POROUS PARTICLES - The present invention is a method for the preparation of porous particles that includes dissolving a polymer material in a first organic solvent and adding a second organic solvent and nonionic organic polymer particles to form an organic phase. The organic phase is dispersed in an aqueous phase that includes a particulate stabilizer to form a dispersion and the dispersion is homogenized. The first and second organic solvents are evaporated and the product is recovered. | 10-30-2008 |
20090017396 | SILICONE WAX-CONTAINING TONER PARTICLES WITH CONTROLLED MORPHOLOGY - The present invention is a method for the preparation of electrostatographic toner including the following steps. A first dispersion is prepared with a solvent, a silicone wax, and a hyperdispersant. The first dispersion is added to an organic solvent containing a polymer material to form an organic phase. The organic phase is dispersed in an aqueous phase containing a particulate stabilizer to form a second dispersion. The second dispersion is homogenized. The organic solvent is evaporated from the second dispersion and the resultant product is recovered, washed and dried. In an alternate method the hyperdispersant is added directly to the organic phase before mixing with the aqueous phase. | 01-15-2009 |
20100159385 | METHOD OF PREPARING TONER HAVING CONTROLLED MORPHOLOGY - A method for the preparation of shaped polymeric particles, and in a particular embodiment shaped electrostatographic toner particles, of controlled morphology including the following steps. A selected solvent or solvent mixture is used to dissolve a polyester polymer material to form an organic phase, wherein the polyester material is formed from at least one diol and at least one multicarboxylic aromatic acid and has a solubility parameter of greater than 9.0 (cal/cm | 06-24-2010 |
20110123920 | TONER POROUS PARTICLES CONTAINING HYDROCOLLOIDS - The present invention is toner particle that includes a continuous phase of binder polymer and a second phase of hydrocolloid. The particle has a porosity of at least 10 percent. | 05-26-2011 |
20110136059 | METHOD FOR PREPARING MULTIPLE EMULSION AND POROUS POLYMER PARTICLES THEREFROM - A method of manufacturing a double emulsion with narrow dispersed phase particle size distribution comprising: providing an organic phase comprising solid hydrocolloid particles dispersed in an organic solvent; and dispersing the organic phase in an aqueous phase in the presence of a controlled amount of stabilizing agent to form an emulsion of droplets of the organic phase dispersed in the external aqueous phase, wherein the hydrocolloid particles in the organic phase droplets are swelled with water from the external aqueous phase to form internal droplets of an aqueous phase in the organic phase droplets, thereby forming a double emulsion comprising droplets of the organic phase of controlled narrow particle size distribution in the external aqueous phase, where the organic phase droplets contain internal droplets of an aqueous phase. A method for producing porous polymeric particles by such a double emulsion method, wherein the organic phase further comprises a polymer resin, and wherein the organic solvent is removed from the dispersed organic phase droplets to form porous toner particles. | 06-09-2011 |
20110262654 | PROCESS FOR PREPARING POLYMER PARTICLES CONTAINING METALLIC FLAKES - A process for forming polymer particles containing metallic flakes, comprising: a) forming a suspension of metallic flakes in a solution of a polymeric binder in a solvent; b) forming droplets of the suspension, c) freezing the droplets to freeze solvent in the droplets to form frozen solvent domains within the polymeric binder, and d) removing the frozen solvent from the polymeric binder thereby forming porous polymer particles containing the metallic flakes encapsulated therein. | 10-27-2011 |
20110262858 | TONER CONTAINING METALLIC FLAKES AND METHOD OF FORMING METALLIC IMAGE - The present invention relates to a porous toner particle with encapsulated metallic flakes. The porous particle containing metallic flakes can be useful for reproduction of a metallic hue upon fusing to a substrate, preferably golden or silvery hue, and for manufacturing of printed circuits, by a printing process, especially electrophotography. | 10-27-2011 |
20120003581 | METHOD OF MANUFACTURING WAX-CONTAINING POLYMER PARTICLES - The present invention is directed towards methods of manufacturing wax-containing polymer particles by limited coalescence processes employing aqueous wax dispersions. In one embodiment, an aqueous wax dispersion or emulsion is dispersed in an oil phase comprising a water-immiscible solvent and a polymer to form a transient water-in-oil (W/O) emulsion, and a further aqueous phase containing a particulate stabilizer is then added to the W/O emulsion to induce phase inversion, and the mixture homogenized to form an oil-in-water (O/W) emulsion. The solvent is then removed from the emulsion to form particles containing wax domains inside. In another embodiment, the aqueous wax dispersion is first mixed with the aqueous phase containing the particulate stabilizer, and homogenization is made with the oil phase to form an O/W emulsion, from which wax-containing particles are obtained after solvent removal. In still further embodiments, the aqueous wax dispersion is used in the second water phase of a double emulsion (W1/O/W2) process to form porous polymer particles containing the wax. | 01-05-2012 |
20120136080 | POROUS PARTICLES WITH IMPROVED FILTERING PERFORMANCE - A method of manufacturing porous polymer particles with improved filterability is described. One or more first water phases are formed comprising an anionic hydrocolloid with a mass-per-charge value of less than 600 and a relatively minor amount, compared to the anionic hydrocolloid, of at least one of a nonionic, cationic, zwitterionic, or weakly anionic water soluble or dispersible polymer, where the weakly anionic water soluble or dispersible polymer has a mass-per-charge value of larger than 600. A water-in-oil emulsion is formed by dispersing the one or more first water phases into an organic phase comprising at least one of either (i) preformed polymer dissolved in an organic solvent or (ii) polymerizable monomers, and homogenizing. A water-in-oil-in-water multiple emulsion is formed by dispersing the water-in-oil emulsion into a second water phase containing a stabilizing agent and homogenizing. The organic solvent is removed to precipitate the preformed polymer, or the polymerizable monomers are polymerized, to obtain a dispersion of porous polymer particles in an external aqueous phase, wherein individual porous particles each comprise a continuous polymer phase and internal pores containing an internal aqueous phase. The dispersion of porous polymer particles is filtered to remove the external aqueous phase. The method enables increased filtration rates of porous polymer particle dispersions containing water in the pores. | 05-31-2012 |
20130165541 | PROCESS FOR PREPARING POROUS POLYMER PARTICLES - A process for forming polymer particles with aligned pores and controlled narrow particle size distribution, including: a) forming an oil phase by dissolving a polymeric binder in a solvent; b) dispersing the oil phase into a water phase containing a controlled amount of particulate stabilizer and forming an oil-in-water emulsion of controlled narrow dispersed oil phase droplet size distribution; c) freezing the emulsion to freeze solvent in the oil droplets to form frozen solvent domains within the polymeric binder, and also the water in the continuous water phase; and d) removing the frozen solvent from the polymeric binder and the frozen water in the continuous water phase, thereby forming porous polymer particles of controlled narrow particle size distribution and containing directional aligned non-spherical pore structures. Optionally, the porous particles may contain encapsulated functional ingredients. | 06-27-2013 |