Patents by Inventor Raj Patel

Raj Patel has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Publication number: 20070111127
    Abstract: Embodiments include a toner with a fractionated and/or distilled wax having from about 30 to about 64 carbon units, a degree of crystallinity as calculated by heat of melting and as measured by DSC of from about 55 to about 100, a Mw is from about 500 to about 800, and a polydispersity of from about 1 to about 1.05.
    Type: Application
    Filed: November 14, 2005
    Publication date: May 17, 2007
    Inventors: Raj Patel, David Sanders, T. Ng, Stephan Drappel, Sandra Gardner, Sonja Hadzidedic, Louis Isganitis, Timothy Lincoln, Kevin Marcell
  • Publication number: 20070111128
    Abstract: Embodiments include a chemical toner composition having a first resin including a styrene vinyl copolymer and having a Tg of from about 46 to about 56° C., b) a second resin including a styrene vinyl copolymer having a Tg of from about 55 to about 65° C., c) a distilled wax having a heat of crystallization and a heat of enthalpy, both from about 1.0 to about 4.0 J/g for every weight percent of the wax used in the chemical toner composition, and wherein the wax has a peak melting point of from about 70 to about 99° C., and d) a colorant, wherein the chemical toner has a gloss of from about 30 to about 80 GGU.
    Type: Application
    Filed: November 14, 2005
    Publication date: May 17, 2007
    Inventors: Raj Patel, David Sanders, Christine Anderson, Allan Chen, Daryl Vanbesien, Patricia Burns
  • Publication number: 20070111129
    Abstract: A toner composition includes a resin substantially free of cross linking and having a weight average molecular weight of from about 50,000 to about 1,000,000, a wax, a colorant, and a coagulant.
    Type: Application
    Filed: November 15, 2005
    Publication date: May 17, 2007
    Applicant: XEROX CORPORATION
    Inventors: Raj Patel, Daryl Vanbesien, Edward Zwartz, Rosa Duque
  • Publication number: 20070111131
    Abstract: Embodiments include a toner with a distilled wax having a crystallinity of from about 55 to about 100 percent, wherein the degree of crystallinity is calculated using the following formulas: [Heat of enthalpy (Hm) J/g/294 J/g]×100 =degree of crystallinity (Xc); [Heat of recrystallization (Hrc) J/g/294 J/g]×100 =degree of crystallinity (Xc); and Sc/(Sc+Sa)]×100%, wherein Sc is a diffraction peak area of a crystalline component of the wax and the Sa is a diffraction peak area of an amorphous component of the wax; and wherein the Mp, Mn and Mw of the wax are all within the range of from about 500 to about 800, and wherein the wax has a polydispersity of from about 1 to about 1.05.
    Type: Application
    Filed: November 14, 2005
    Publication date: May 17, 2007
    Inventors: Raj Patel, David Sanders, T Ng, Stephan Drappel, Sandra Gardner, Sonja Hadzidedic, Louis Isganitis, Timothy Lincoln, Kevin Marcell
  • Publication number: 20070087280
    Abstract: The toner includes emulsion aggregation toner particles having a core and a shell. The core includes binder including a first non-crosslinked styrene acrylate polymer and a crosslinked styrene acrylate polymer, at least one colorant, at least one wax, and aluminized silica. The shell includes a second non-crosslinked styrene acrylate polymer that is preferably the same as the non-crosslinked styrene acrylate polymer of the core. The aluminized silica is advantageously used as a coagulant in the emulsion aggregation formation of the toner. A developer containing the toner and a method of forming an image using the toner are also described.
    Type: Application
    Filed: October 17, 2005
    Publication date: April 19, 2007
    Applicant: XEROX CORPORATION
    Inventors: Raj Patel, Edward Zwartz, Biritawit Asfaw
  • Publication number: 20070087281
    Abstract: The toner includes emulsion aggregation toner particles of a binder including a non-crosslinked styrene acrylate polymer, at least one colorant, at least one wax, and aluminized silica, wherein an amount of aluminum metal in the toner particles is from about 50 ppm to about 600 ppm. Such toner is able to provide a high level of gloss while maintaining a low minimum fixing temperature. The aluminized silica acts as a coagulant during the emulsion aggregation formation process of the toner.
    Type: Application
    Filed: October 17, 2005
    Publication date: April 19, 2007
    Applicant: XEROX CORPORATION
    Inventors: Raj Patel, Daryl Vanbesien, David Sanders, Allan Chen
  • Publication number: 20070042286
    Abstract: A toner process comprising aggregating or coagulating a latex emulsion comprising a resin, a colorant and wax particles using an amount of polymetal ion coagulant to provide core particles; heating the core particles to provide micron size aggregates; optionally adding a second resin emulsion; adding a sequestering or complexing component and a base to remove the polymetal ion in a controlled manner; further heating the mixture to provide toner particles; and optionally, isolating the toner particles.
    Type: Application
    Filed: August 22, 2005
    Publication date: February 22, 2007
    Inventors: Daryl Vanbesien, David Sanders, Raj Patel, Christine Anderson, Patricia Burns, Nam-Suk Ro
  • Publication number: 20070020542
    Abstract: A polyester toner includes particles of a resin, a colorant, an optional wax, and a polyion coagulant, where the toner is prepared by an emulsion aggregation process.
    Type: Application
    Filed: July 22, 2005
    Publication date: January 25, 2007
    Applicant: XEROX CORPORATION
    Inventor: Raj Patel
  • Publication number: 20070020554
    Abstract: A dual coagulant toner process comprising adding a first component comprising an ionic salt to a latex emulsion of resin having a colorant mixed therein, to form a latex emulsion; adding a second component comprising an organo-metallic aggregating agent to the latex emulsion by agitation at a temperature above a glass transition temperature of the resin, thereby forming a product mixture; subsequently cooling the product mixture to a temperature below the glass transition temperature of the resin, in order to form toner particles; and optionally, isolating the toner particles.
    Type: Application
    Filed: July 25, 2005
    Publication date: January 25, 2007
    Inventors: Allan Chen, Tie Ng, Richard Veregin, Maria McDougall, Guerino Sacripante, Raj Patel
  • Publication number: 20060222990
    Abstract: A method of making particles suitable for use as toners includes forming a mixture of sulfonated olyester resin, a colorant dispersion and optionally a wax dispersion, homogenizing the mixture, adding a coagulant to the mixture to aggregate the mixture to form aggregated particles, and coalescing the aggregated particles to form coalesced particles. In the method, when a predetermined average particle size is achieved during the aggregation and/or coalescing step, a complexing agent that complexes with ions of the coagulant is added in an amount effective to substantially halt any further particle growth. The complexing agent is believed to halt further growth by complexing with free coagulant ions still in the solution.
    Type: Application
    Filed: March 31, 2005
    Publication date: October 5, 2006
    Applicant: XEROX CORPORATION
    Inventors: Valerie Farrugia, Allan Chen, Kimberly Nosella, Raj Patel, Tie Ng
  • Publication number: 20060222996
    Abstract: A process including mixing a sulfonated polyester resin, a colorant, and a coagulant; heating the resulting sulfonated polyester mixture; adding a polymetal halide and an anionic latex to form coated toner particles; and heating the coated toner particles is disclosed.
    Type: Application
    Filed: March 31, 2005
    Publication date: October 5, 2006
    Inventors: Raj Patel, Mike Hawkins, Paul Gerroir, Richard Veregin
  • Publication number: 20060172220
    Abstract: A toner process involving the heating a mixture of an acicular magnetite dispersion, a colorant dispersion, a wax dispersion, a first latex containing a crosslinked resin, and a second latex containing a resin free of crosslinking in the presence of a coagulant to provide aggregates, stabilizing the aggregates with an organic complexing compound salt dissolved in a base, and further heating the aggregates to provide coalesced toner particles.
    Type: Application
    Filed: January 28, 2005
    Publication date: August 3, 2006
    Inventors: Raj Patel, Allan Chen, Cuong Vong
  • Publication number: 20060166121
    Abstract: A toner process that includes a first heating of a colorant dispersion, a first polyester resin free latex emulsion, a second polyester latex emulsion, and a wax dispersion in the presence of a coagulant containing a metal ion; adding a third polyester free latex; adding an organic sequestering compound or a silicate salt sequestering compound, followed by a second heating.
    Type: Application
    Filed: January 27, 2005
    Publication date: July 27, 2006
    Inventors: Raj Patel, Guerino Sacripante, Edward Zwartz, Enno Agur, Allan Chen, T. Ng, Kimberly Nosella, Cuong Vong, Karen Moffat
  • Publication number: 20060166122
    Abstract: A toner process comprised of a first heating of a mixture of an acicular magnetite dispersion, a colorant dispersion, a wax dispersion, and a core latex comprised of a first latex containing a vinyl crystalline polyester resin substantially free of crosslinking, and wherein said polyester is substantially dissolved in a vinyl monomer and polymerized to provide said first core latex resin, and which mixture contains a second crosslinked resin containing latex wherein said heating is accomplished in the presence of a coagulant to provide aggregates; adding a shell latex comprised of a polymer substantially free of crosslinking, and further heating said aggregates to provide coalesced toner particles, and wherein said further heating is at a higher temperature than said first heating.
    Type: Application
    Filed: January 27, 2005
    Publication date: July 27, 2006
    Inventors: Raj Patel, Karen Moffat, Fatima Mayer, Allan Chen
  • Publication number: 20060160010
    Abstract: A toner is disclosed that includes a toner binder of crystalline sulfonated polyester, wherein the crystalline sulfonated polyester is 90% by weight or more of the toner binder, and a colorant. In other embodiments, the toner includes a crystalline sulfonated polyester and a linear amorphous sulfonated polyester, and a colorant. In these embodiments, the crystalline sulfonated polyester is from about 20% to about 60% by weight of the toner binder and the linear amorphous sulfonated polyester is from about 40% to about 80% by weight of the toner binder. The toners possess excellent miniumum fixing temperatures in the range of from about 80° C. to about 130° C. Processes for preparing the toners are also described.
    Type: Application
    Filed: January 19, 2005
    Publication date: July 20, 2006
    Applicant: XEROX CORPORATION
    Inventors: Raj Patel, Edward Zwartz, Guerino Sacripante, Allan Chen
  • Publication number: 20060121384
    Abstract: Toner compositions include a non cross linked resin; a cross linked resin or gel; a wax; and a colorant. Processes for preparing a toner include mixing a non-cross linked resin and a cross-linked resin or gel in the presence of a wax, a colorant, and a coagulant to provide toner size aggregates; adding additional non-cross linked latex to the formed aggregates thereby providing a shell over the formed aggregates; heating the shell covered aggregates to form toner; and, optionally, isolating the toner.
    Type: Application
    Filed: December 3, 2004
    Publication date: June 8, 2006
    Inventors: Raj Patel, Daryl Vanbesien, Enno Agur, Edward Zwartz, Maria McDougall, Emily Moore, Patricia Burns, Kimberly Nosella, Ke Zhou, Vladislav Skorokhod, Wafa Bashir, Shigang Qiu
  • Publication number: 20060105261
    Abstract: The present disclosure relates to a process including a first heating of a latomer mixture including at least one free radical polymerizable monomer, and at least one alkylene anhydride; a second heating of the latomer mixture to form polymeric particles; and combining the polymeric particles with at least one amine.
    Type: Application
    Filed: November 17, 2004
    Publication date: May 18, 2006
    Inventors: Barkey Keoshkerian, Raj Patel, Ed Zwartz, Cuong Vong
  • Publication number: 20060089425
    Abstract: Toner particles and a dry-powder electrophoretic display employing such particles are disclosed herein. The toner particles adapted for a dry-powder electrophoretic display comprise emulsion/aggregation particles having a negative charge. At least a portion of the toner particles include a surface coating, comprising a methacrylate polymer, disposed on the surface of the toner particles to impart a positive charge to a set of toner particles. The emulsion/aggregation toner particles have a particle size generally less than about 10 micrometers that allows for improved image quality as compared to conventional toners utilized in dry-powder electrophoretic displays.
    Type: Application
    Filed: October 26, 2004
    Publication date: April 27, 2006
    Inventors: Naveen Chopra, Valerie Farrugia, Jurgen Daniel, Raj Patel, Man-Chung Tam, Meng Lean
  • Publication number: 20060063086
    Abstract: A process for preparing toner particles and compositions adapted for use in preparing toners that comprise a blend of a first polyester resin with a second sharp melting polyester resin. The process includes forming an emulsion resin comprising a branched polyester resin, a crystalline polyester resin, a colorant, and optionally a wax. The resin mixture is aggregated using an aggregating agent, such as a zinc acetate solution, to form an aggregate mixture. The aggregate mixture is then coalesced at a temperature of from about 5 to about 20° C. above the Tg of the emulsion resin to produce the resultant toner particles.
    Type: Application
    Filed: September 23, 2004
    Publication date: March 23, 2006
    Inventors: Guerino Sacripante, Fatima Mayer, Kimberly Nosella, Valerie Farrugia, Raj Patel, Milan Maric, Allan Chen, Edward Zwartz, T. Ng
  • Patent number: D527628
    Type: Grant
    Filed: March 18, 2005
    Date of Patent: September 5, 2006
    Assignee: Handi-Foil Corp.
    Inventor: Raj Patel