Patents by Inventor Walter Mychajlowskij

Walter Mychajlowskij 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).

  • Patent number: 5962177
    Abstract: A toner composition comprised of a pigment, and a linear polyester resin of the formula ##STR1## where R' is independently selected from the group consisting of phenylene, cyclohexylene, and alkylene with from 4 to about 24 carbon atoms, where R is an oxyalkylene group of the formula ##STR2## where R" is independently selected from the group hydrogen and hydrocarbon substituents with from 1 to about 24 carbon atoms, n is an integer from about 2 to about 10,000, and m is an integer from about 2 to about 10,000.
    Type: Grant
    Filed: January 21, 1997
    Date of Patent: October 5, 1999
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Walter Mychajlowskij, Beng S. Ong
  • Patent number: 5945245
    Abstract: A surfactant free process for the preparation of toner comprising heating a mixture of an emulsion latex, a colorant, and an organic complexing agent.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: August 31, 1999
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Guerino G. Sacripante, Daniel A. Foucher, Raj D. Patel, Stephan V. Drappel
  • Patent number: 5919595
    Abstract: A process for the preparation of toner comprising mixing an emulsion latex, a colorant dispersion, and monocationic salt, and which mixture possesses an ionic strength of from about 0.001 molar (M) to about 5 molar, and optionally cooling.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: July 6, 1999
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Daniel A. Foucher, Guerino G. Sacripante, Raj D. Patel, Beng S. Ong
  • Patent number: 5916725
    Abstract: A process for the preparation of toner comprising mixing an amine, an emulsion latex containing sulfonated polyester resin, and a colorant dispersion, heating the resulting mixture, and optionally cooling.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: June 29, 1999
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Walter Mychajlowskij, Daniel A. Foucher, Guerino G. Sacripante, Beng S. Ong
  • Patent number: 5910387
    Abstract: A toner composition comprised of colorant, and an addition polymer resin of styrene, butadiene, acrylonitrile and acrylic acid.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: June 8, 1999
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Beng S. Ong, Emily L. Moore, Raj D. Patel
  • Patent number: 5869215
    Abstract: A process for the preparation of toner including(i) blending an aqueous colorant dispersion with a latex blend comprised of a linear polymer and a soft crosslinked polymer;(ii) heating the resulting mixture at about below, or about equal to the glass transition temperature (Tg) of the linear latex polymer to form aggregates; and(iii) subsequently heating said aggregate suspension about above, or about equal to the Tg of the linear latex polymer to effect fusion or coalescence of said aggregates.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Patricia A. Burns, Raj D. Patel, David J. Sanders
  • Patent number: 5869216
    Abstract: A process for the preparation of toner comprising blending an aqueous colorant dispersion and a latex emulsion containing resin; heating the resulting mixture at a temperature below about the glass transition temperature (Tg) of the latex resin to form toner sized aggregates; heating said resulting aggregates at a temperature above about the Tg of the latex resin to effect fusion or coalescence of the aggregates; redispersing said toner in water at a pH of above about 7; contacting the resulting mixture with a metal halide or salt, and then with a mixture of an alkaline base and a salicylic acid, a catechol, or mixtures thereof at a temperature of from about 25.degree. C. to about 80.degree. C.; and optionally isolating the toner product, washing, and drying.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: February 9, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Raj D. Patel, Patricia A. Burns, Richard P. N. Veregin
  • Patent number: 5858601
    Abstract: A process for the preparation of toner comprising(i) blending (a) a colorant dispersion containing a first ionic surfactant with (b) a latex emulsion comprised of an aqueous dispersion of core-shell polymer particles with a crosslinked polymer core and a linear polymer shell, and optional nonionic surfactant and a second ionic surfactant with a charge polarity opposite to that of said first ionic surfactant in said colorant dispersion;(ii) heating the resulting mixture at about below the glass transition temperature (Tg) of the linear latex shell polymer to form aggregates; and(iii) subsequently heating said aggregates about above the Tg of the linear latex shell polymer to effect coalescence and fusion of said aggregates.
    Type: Grant
    Filed: August 3, 1998
    Date of Patent: January 12, 1999
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, T. Hwee Ng, Walter Mychajlowskij, Raj D. Patel, Patricia A. Burns
  • Patent number: 5853944
    Abstract: A process for the preparation of toner with a first aggregation of sulfonated polyester, and thereafter a second aggregation with a colorant dispersion and an alkali halide.
    Type: Grant
    Filed: January 13, 1998
    Date of Patent: December 29, 1998
    Assignee: Xerox Corporation
    Inventors: Daniel A. Foucher, Raj D. Patel, Guerino G. Sacripante, Walter Mychajlowskij
  • Patent number: 5804349
    Abstract: A toner comprised of pigment, and an addition polymer resin generated from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid.
    Type: Grant
    Filed: August 7, 1997
    Date of Patent: September 8, 1998
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, Walter Mychajlowskij, David J. Sanders, T. Hwee Ng
  • Patent number: 5763133
    Abstract: A process for the preparation of toner comprising(i) blending (a) an aqueous pigment dispersion containing a first ionic surfactant and an optional charge control agent with (b) a latex blend comprised of linear polymer and crosslinked polymer particles, optional nonionic surfactant and a second ionic surfactant with a charge polarity opposite to that of said first ionic surfactant in said pigment dispersion;(ii) heating the resulting mixture at about below the glass transition temperature (Tg) of the linear latex polymer to form toner sized aggregates; and(iii) subsequently heating said aggregate suspension about above the Tg of the linear latex polymer to effect fusion or coalescence of said aggregates.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: June 9, 1998
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, David J. Sanders, Stephan V. Drappel
  • Patent number: 5698223
    Abstract: A process for the preparation of toner comprising(i) solubilizing an imide based resin in water at pH of from about 10 to about 13 and which solubilizing is accomplished in the presence of nonionic surfactants and anionic surfactants; followed by precipitating the resulting dissolved imide resin into colloidal particles with a size diameter of from about 20 nanometers to about 500 nanometers, and which precipitating is accomplished with a high shearing device operating at a speed of from about 500 to about 2,000 revolutions per minute; acidifying the resulting mixture to a pH of from about 2 to about 4;(ii) preparing a pigment dispersion in water, which dispersion is comprised of a pigment, an oppositely charged ionic surfactant and optionally charge control agent;(iii) shearing (i) and (ii), thereby causing a flocculation of the resin, pigment, surfactants, and optional charge control agent;(iv) heating the resulting flocculent mixture of (iii) with stirring at a temperature of from about 25.degree. C.
    Type: Grant
    Filed: March 28, 1997
    Date of Patent: December 16, 1997
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Guerino G. Sacripante, Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz
  • Patent number: 5683848
    Abstract: A toner comprised of pigment, and an addition polymer resin generated from about 55 to about 80 weight percent of styrene, from about 1 to about 25 weight percent of acrylate, from about 1 to about 20 weight percent of acrylonitrile, and from about 0.5 to about 5 weight percent of acrylic acid.
    Type: Grant
    Filed: October 2, 1996
    Date of Patent: November 4, 1997
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Grazyna E. Kmiecik-Lawrynowicz, Raj D. Patel, Walter Mychajlowskij, David J. Sanders, T. Hwee Ng
  • 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: 5660965
    Abstract: A process for the preparation of toner compositions, or toner particles comprising generating a latex comprised of a sulfonated polyester and olefinic resin in water; generating a pigment mixture comprised of said pigment dispersed in water; shearing said latex and said pigment mixture; adding an alkali (II) halide; stirring and heating to enable coalescence; followed by filtration and drying.
    Type: Grant
    Filed: June 17, 1996
    Date of Patent: August 26, 1997
    Assignee: Xerox Corporation
    Inventors: Walter Mychajlowskij, Guerino G. Sacripante, Raj D. Patel, Daniel A. Foucher
  • Patent number: 5645968
    Abstract: A process for the preparation of toner comprising(i) preparing, or providing a cationic emulsion resin latex comprised of a resin derived from at least one olefinic nonpolar monomer, a cationic olefinic monomer, a cationic free radical initiator, and optionally a chain transfer agent in an aqueous mixture comprised of a nonionic surfactant and a cationic surfactant, and which mixture is heated at a temperature of from about 60.degree. C. to about 95.degree. C.
    Type: Grant
    Filed: October 7, 1996
    Date of Patent: July 8, 1997
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Maureen M. Kedian, Raj D. Patel, Walter Mychajlowskij, Beng S. Ong
  • Patent number: 5601689
    Abstract: A process for removing a xerographic image from a substrate which comprises contacting the image with an aqueous solution comprised of water, a surfactant, ionic salts and caustic reagent.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: February 11, 1997
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, David F. Rutland, Walter Mychajlowskij, J. Stephen Kittelberger
  • Patent number: 5585215
    Abstract: A toner comprised of color pigment and an addition polymer resin, and wherein said resin is generated by emulsion polymerization of from 70 to 85 weight percent of styrene, from about 5 to about 20 weight percent of isoprene, from about 1 to about 15 weight percent of acrylate, or from about 1 to about 15 weight percent of methacrylate, and from about 0.5 to about 5 weight percent of acrylic acid.
    Type: Grant
    Filed: June 13, 1996
    Date of Patent: December 17, 1996
    Assignee: Xerox Corporation
    Inventors: Beng S. Ong, Walter Mychajlowskij, Raj D. Patel
  • Patent number: 5582951
    Abstract: A process for the preparation of carrier particles which comprises mixing a dispersion of water, submicron magnetic particles, and ionic surfactant with a latex comprised of resin particles suspended in an aqueous solution containing a surfactant that is counterionic in charge to said ionic surfactant, and a nonionic surfactant; thereafter heating the resulting mixture below about the latex resin glass transition temperature (Tg) while stirring to form aggregates, followed by increasing the temperature of said mixture to about above the latex resin Tg, and subsequently adding additional counterionic or nonionic surfactant solution to minimize, or avoid any further growth in particle size during heating of the mixture about above the latex resin Tg, and wherein said resin Tg is in the range of from between about 45.degree. C. to about 100.degree. C.
    Type: Grant
    Filed: July 3, 1995
    Date of Patent: December 10, 1996
    Assignee: Xerox Corporation
    Inventors: Raj D. Patel, Grazyna E. Kmiecik-Lawrynowicz, Michael A. Hopper, Walter Mychajlowskij, Beng S. Ong
  • Patent number: 5512401
    Abstract: A toner composition comprised of a pigment and a polyimideamic acid resin.
    Type: Grant
    Filed: February 27, 1995
    Date of Patent: April 30, 1996
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Walter Mychajlowskij, J. Stephen Kittelberger