Patents by Inventor Michael A. Hopper

Michael A. Hopper 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: 20020187415
    Abstract: A toner process including, for example, mixing a latex with a colorant wherein the latex contains resin and an ionic surfactant, and the colorant contains a surfactant and a colorant; adding a polyaluminum chloride; affecting aggregation by heating; adding a chelating component and a base wherein the base increases the pH of the formed aggregates; heating the resulting mixture to accomplish coalescence; and isolating the toner.
    Type: Application
    Filed: June 11, 2001
    Publication date: December 12, 2002
    Applicant: Xerox Corporation
    Inventors: Lu Jiang, Nan-Xing Hu, Raj D. Patel, Walter Mychajlowskij, Michael A. Hopper
  • Publication number: 20020187416
    Abstract: A toner process including, for example, mixing a latex with a colorant wherein the latex contains resin and an ionic surfactant, and the colorant contains a surfactant and a colorant; adding a polyaluminum chloride; affecting aggregation by heating; adding a chelating component and a base wherein the base increases the pH of the formed aggregates; heating the resulting mixture to accomplish coalescence; and isolating the toner.
    Type: Application
    Filed: June 5, 2002
    Publication date: December 12, 2002
    Applicant: Xerox Corporation
    Inventors: Lu Jiang, Nan-Xing Hu, Raj D. Patel, Walter Mychajlowskij, Michael A. Hopper
  • Patent number: 6416920
    Abstract: A process for the preparation of toner by, for example, mixing a colorant, a latex, optionally a wax and a water solubilized silica with an alumina coating or an aluminized silica as a coagulant.
    Type: Grant
    Filed: March 19, 2001
    Date of Patent: July 9, 2002
    Assignee: Xerox Corporation
    Inventors: Michael A. Hopper, Raj D. Patel, Daryl Vanbesien
  • Patent number: 6352810
    Abstract: A process for the preparation of toner comprising mixing a colorant, a latex, and a polyamine followed by aggregation and coalescence, and wherein said process is accomplished in the presence of an oxidizing agent.
    Type: Grant
    Filed: February 16, 2001
    Date of Patent: March 5, 2002
    Assignee: Xerox Corporation
    Inventors: Lu Jiang, Walter Mychajlowskij, Michael A. Hopper
  • Patent number: 6268102
    Abstract: A process for the preparation of toner comprising mixing a colorant, a latex, optionally a wax and a polyaluminum sulfosilicate.
    Type: Grant
    Filed: April 17, 2000
    Date of Patent: July 31, 2001
    Assignee: Xerox Corporation
    Inventors: Michael A. Hopper, Raj D. Patel, Tanya J. Martin
  • Patent number: 6268103
    Abstract: A toner process comprising mixing a functionalized wax with a colorant and a resin latex emulsion; adding an inorganic cationic coagulant; heating below the latex resin Tg; adjusting the pH to basic; and heating above the latex resin Tg.
    Type: Grant
    Filed: August 24, 2000
    Date of Patent: July 31, 2001
    Assignee: Xerox Corporation
    Inventors: Michael A. Hopper, Raj D. Patel
  • Patent number: 6210853
    Abstract: A process for the preparation of toner including (i) gerating by emulsion polymerization in the presence of an initiator a first resin latex emulsion; (ii) generating by polycondensation a second resin latex optionally in the presence of a catalyst; (iib) dispersing the resin of (ii) in water; (iii) mixing (iib) with a colorant thereby providing a colorant dispersion; (iiib) mixing the resin latex emulsion of (i) with the resin/colorant mixture of (iii) to provide a blend of a resin and colorant; (iv) adding an aqueous inorganic cationic coagulant solution of a polymeric metal salt and optionally an organic cationic coagulant to the resin/colorant blend of (iiib); (v) heating at a temperature of from about 5 to about 10 degrees Centigrade below the resin Tg of (i), to thereby form aggregate particles and which particles are optionally at a pH of from about 2 to about 3.5; (vi) adjusting the pH of (v) to about 6.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: April 3, 2001
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Emily L. Moore, Guerino G. Sacripante
  • Patent number: 6190820
    Abstract: A process for the preparation of toner by, for example (i) generating by emulsion polymerization in the presence of an initiator a first resin latex emulsion; (ii) generating in the presence of an oil soluble initiator by solution polymerization a second resin latex; (iii) mixing (ii) with a colorant; (iiib) mixing the resin latex emulsion of (i) with the resin/colorant mixture of (iii) to provide a blend of a resin and colorant; (iv) adding an aqueous inorganic cationic coagulant solution of a metal salt and optionally an organic cationic coagulant to the resin/colorant blend of (iiib); (v) heating at a temperature of from about 5° C. to about 10° C. below the resin Tg of (i), to form aggregate particles; (vi) adjusting the pH of (v) by the addition of a base; (vii) heating the aggregate particles of (v) at temperatures of from about 5° C. to about 50° C. above the Tg of the resin of (i), followed by the addition of an acid.
    Type: Grant
    Filed: September 7, 2000
    Date of Patent: February 20, 2001
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Walter Mychajlowskij
  • Patent number: 6132924
    Abstract: A process for the preparation of toner comprising mixing a colorant, a latex, and two coagulants, followed by aggregation and coalescence.
    Type: Grant
    Filed: October 15, 1998
    Date of Patent: October 17, 2000
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Richard P. N. Veregin
  • Patent number: 6130021
    Abstract: A process involving the mixing of a latex emulsion containing resin and a surfactant with a colorant dispersion containing a nonionic surfactant, and a polymeric additive and adjusting the resulting mixture pH to less than about 4 by the addition of an acid and thereafter heating at a temperature below about, or equal to about the glass transition temperature (Tg) of the latex resin, subsequently heating at a temperature above about, or about equal to the Tg of the latex resin, cooling to about room temperature, and isolating the toner product.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: October 10, 2000
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper
  • Patent number: 6120967
    Abstract: A process for the preparation of a toner composition includes (i) forming a resin latex dispersion of a resin in an aqueous ionic surfactant solution from a latex utilizing an ionic surfactant and optionally a nonionic surfactant; (ii) preparing a pigment dispersion in water of a pigment dispersed in water and a nonionic dispersant, and optionally an ionic surfactant of the same polarity as that employed in preparing the resin latex dispersion of step (i); (iii) blending at least a portion of the resin latex dispersion with the pigment dispersion, and optionally a wax dispersion, to form a resin-pigment blend; (iv) adding a portion of a counterionic coagulant in an aqueous solution to the resin-pigment blend, while continuously subjecting the mixture to high shear, to induce a homogeneous gel of the resin-pigment blend, wherein the amount of the counterionic coagulant added is 25 to 90% by weight of a total amount of counterionic coagulant to be added during the process; (v) heating the sheared gel at tempera
    Type: Grant
    Filed: January 19, 2000
    Date of Patent: September 19, 2000
    Assignee: Xerox Corporation
    Inventors: Michael A. Hopper, Raj D. Patel, Lori Ann Rettinger, Tanya Jane Martin
  • Patent number: 5994020
    Abstract: A toner process which comprises mixing(i) a colorant dispersion, and a(ii) a nonionic surfactant, an ionic surfactant or mixtures thereof, with(iii) a latex comprised of resin and a mixture of anionic surfactant and a nonionic surfactant;(iv) heating the resulting blend of (iii) about equal to, or below about the glass transition temperature (Tg) of the resin; and(v) optionally adding additional anionic surfactant to the resulting aggregated suspension of (iv);(vi) heating the resulting mixture of (v) about equal to, or above about the Tg of the resin and(vii) isolating the toner.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: November 30, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Michael A. Hopper, Paul F. Smith, Beng S. Ong, Allan K. Chen
  • Patent number: 5981651
    Abstract: A process comprising (1) polymerizing an organic phase of monomer in the presence of a carboxylic acid, an oil soluble chain transfer agent, and a partially water soluble chain transfer agent; and which polymerizing is accomplished in the presence of (2) an aqueous phase containing a nonionic surfactant, and an anionic surfactant, and wherein there is added to the aqueous phase an aqueous initiator solution of an inorganic persulfate, and wherein the resulting latex contains particles of polymer with carboxylic acid; aggregating said latex particles with colorant; thereafter adding an effective amount of anionic surfactant and heating the mixture resulting about equal to, or about above the polymer Tg resulting from said monomer, or said monomers.
    Type: Grant
    Filed: September 2, 1997
    Date of Patent: November 9, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Michael A. Hopper, Walter Mychajlowskij
  • Patent number: 5977210
    Abstract: A process for the preparation of ink compositions comprising the emulsion polymerization of monomer, water, surfactant, and initiator with stirring and heating to provide a latex; mixing therewith a pigment dispersion of pigment particles, water, and cationic surfactant; blending the mixture; thereafter stirring the mixture; and subsequently adding additional anionic surfactant to stabilize the aggregate particles.
    Type: Grant
    Filed: January 30, 1995
    Date of Patent: November 2, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Marcel P. Breton, Michael A. Hopper, Grazyna E. Kmiecik-Lawrynowicz, Beng S. Ong
  • Patent number: 5936008
    Abstract: An ink for ink jet printing includes a liquid vehicle comprising water and toner particles with a colorant dispersed in or associated with the toner particles. The ink composition combines the print quality advantages of xerographic printing with the economic advantages of ink jet printing, thereby providing waterfast, archival quality prints.
    Type: Grant
    Filed: November 21, 1995
    Date of Patent: August 10, 1999
    Assignee: Xerox Corporation
    Inventors: Robert N. Jones, Edward J. Radigan, Jr., Susan Robinette, Raj D. Patel, Michael A. Hopper, Grazyna E. Kmiecik-Lawrynowicz, Garland J. Nichols, Beng S. Ong
  • Patent number: 5863698
    Abstract: A process for the preparation of toner comprising mixing a colorant containing a surfactant and a latex emulsion, and wherein the latex emulsion contains resin and a nonionic hydrolyzable surfactant, and wherein said surfactant is of the Formulas (I) or (II), or optionally mixtures thereof ##STR1## wherein R.sup.1 is a hydrophobic aliphatic, or hydrophobic aromatic group; R.sup.2 is selected from the group consisting of hydrogen, alkyl, aryl, alkylaryl, and alkylarylalkyl; R.sup.3 is hydrogen or alkyl; A is a hydrophilic polymer chain, and m represents the number of A segments; heating below about the resin latex glass transition temperature, followed by the addition of an anionic stabilizer, thereafter heating above about the resin glass transition temperature, and adjusting the pH of the resulting mixture of resin and colorant particles suspended in an aqueous phase containing anionic surfactant, cationic surfactant and nonionic hydrolyzable surfactant, wherein said pH is increased from about 1.
    Type: Grant
    Filed: April 13, 1998
    Date of Patent: January 26, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Paul F. Smith, Beverly C. Dutoff, Nan-Xing Hu, Beng S. Ong, Michael A. Hopper
  • Patent number: 5766818
    Abstract: A process for the preparation of toner by mixing a colorant dispersion and a latex emulsion, and wherein the latex emulsion contains resin and a surfactant, wherein the surfactant is, for example, of the Formulas (I) or (II) ##STR1## wherein R.sup.1 is a hydrophobic aliphatic, or hydrophobic aromatic group; R.sup.2 is selected from the group consisting of hydrogen, alkyl, aryl, alkylaryl, and alkylarylalkyl; R.sup.3 is hydrogen or alkyl; A is a hydrophilic polymer, and m represents the number of A segments.
    Type: Grant
    Filed: October 29, 1997
    Date of Patent: June 16, 1998
    Assignee: Xerox Corporation
    Inventors: Paul F. Smith, Nan-Xing Hu, Beverly C. Dutoff, Beng S. Ong, Raj D. Patel, Michael A. Hopper
  • Patent number: 5744520
    Abstract: A process for the preparation of polymer compositions which comprises mixing a conductive component with an anionic polymeric latex containing a polymer; adding a cationic surfactant, or flocculant whereby the aggregation of the latex particles and the conductive component particles results; subsequently adding colloidal stabilizer, followed by the addition of a base to obtain a pH of from about 7 to about 12; heating above about the polymer glass transition temperature thereby enabling the severage, or breakage of the formed aggregated particles; further heating above about the polymer glass transition temperature enabling the coalescence of the polymer and conductive component particles; and optionally washing and drying the resulting coalesced product.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: April 28, 1998
    Assignee: Xerox Corporation
    Inventors: Grazyna E. Kmiecik-Lawrynowicz, Richard P. N. Veregin, Raj D. Patel, Michael A. Hopper, Maria V. McDougall
  • Patent number: 5683847
    Abstract: A process comprising:(i) preparing a pigment dispersion, which dispersion is comprised of a pigment, a cationic surfactant, and optionally a charge control agent;(ii) shearing said pigment dispersion with a latex comprised of water, resin, a counterionic or anionic surfactant with a charge polarity of opposite sign to that of said cationic surfactant, and a nonionic surfactant, and wherein said latex is prepared by the addition of monomers containing a chain transfer agent and a organic soluble initiator to a water phase containing a anionic surfactant, and said nonionic surfactant, followed by the addition of a water soluble initiator, and subsequently heating;(iii) heating the above sheared blend below about the glass transition temperature (Tg) of the resin to form electrostatically bound toner size aggregates; and(iv) heating said bound aggregates above about the Tg of the resin.
    Type: Grant
    Filed: March 20, 1996
    Date of Patent: November 4, 1997
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Walter Mychajlowskij, Michael A. Hopper
  • Patent number: 5679724
    Abstract: An ink for ink jet printing includes an emulsifiable polymer resin and a pigment, and may be made by: (a) combining (1) an emulsion of an emulsifiable polymer resin in an anionic medium with (2) a pigment and a cationic surfactant; and (b) aggregating particles in the mixture of step (a) to a desired particle size, thereby producing a solution of aggregated particles. The particles can optionally be coalesced to alter the particle size of the particles.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: October 21, 1997
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Raj D. Patel, Marcel P. Breton, Michael A. Hopper, Grazyna E. Kmiecik-Lawrynowicz, Beng S. Ong