Patents Represented by Attorney Willard G. Montgomery
  • Patent number: 5358814
    Abstract: This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000 and from about 0.1 to about 10 percent by weight based on the weight of the resin particles of a mixture of ortho-benzoic sulfimide as represented by the formula: ##STR1## and para-anisic acid as represented by the formula: ##STR2## in a weight ratio of 1:1 as a charge-controlling additive.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 25, 1994
    Assignee: Eastman Kodak Company
    Inventors: Hans W. Osterhoudt, John C. Wilson, Steven M. Bonser
  • Patent number: 5358818
    Abstract: This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. C. and a weight average molecular weight of 20,000 to 100,000 and, as a charge-control agent, from about 0.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 25, 1994
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Steven M. Bonser, Hans W. Osterhoudt
  • Patent number: 5358817
    Abstract: This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. and a weight average molecular weight of 20,000 to 100,000 and, as a charge-controlling additive, from about 0.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 25, 1994
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Steven M. Bonser, Hans W. Osterhoudt
  • Patent number: 5358816
    Abstract: This invention is directed to dry, negatively charged toner compositions and developer compositions, the toner composition being comprised of resin particles prepared from a polyester having a glass transition temperature of 50.degree. to 100.degree. C.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: October 25, 1994
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Steven M. Bonser, Hans W. Osterhoudt
  • Patent number: 5342724
    Abstract: Polymeric electrophotographic toner and developer compositions are produced by methods including conventional as well as limited coalescence manufacturing techniques. The compositions are prepared by heating a diacid and a diol under conditions effective to form a chain transfer polyester, wherein either the diacid or the diol contain a disulfide moiety. The polyester is reacted with one or more vinyl monomers to form a block copolymer having polyester blocks linked to polyvinyl blocks by sulfide groups previously constituting the disulfide moiety. The block copolymer is reduced to a particulate form to a size suitable for use as an electrophotographic toner by conventional methods, evaporation limited coalescence, and suspension limited coalescence.
    Type: Grant
    Filed: April 10, 1992
    Date of Patent: August 30, 1994
    Assignee: Eastman Kodak Company
    Inventor: John C. Wilson
  • Patent number: 5334477
    Abstract: A method is provided for non-electrostatically transferring dry toner particles which comprise a toner binder and have a particle size of less than 8 micrometers from the surface of an element to a receiver. The element comprises a conductive substrate and a surface layer which contains an electrically insulating polymeric binder resin matrix which comprises a block copolyester or copolycarbonate having a fluorinated polyether block and the receiver comprises a substrate having a coating of a thermoplastic addition polymer on a surface of the substrate in which the Tg of the polymer is less than approximately 10.degree. C. above the Tg of the toner binder. The method involves contacting the toner particles with the receiver which is heated to a temperature such that the temperature of the thermoplastic polymer coating on the receiver substrate during transfer is at least approximately 15.degree. C.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: August 2, 1994
    Assignee: Eastman Kodak Company
    Inventors: Douglas E. Bugner, David S. Hays, Jeanne E. Kaeding, Steven J. Spinelli
  • Patent number: 5334435
    Abstract: A recording liquid for ink-jet recording comprising coloring matter, which is an image-forming component, and a liquid medium for dissolving the coloring matter therein. The liquid medium is ethanol and the coloring matter is a dye represented by the following general formula (A): ##STR1## or the following general formula (B): ##STR2## as an image-forming component.
    Type: Grant
    Filed: November 20, 1992
    Date of Patent: August 2, 1994
    Assignee: Eastman Kodak Company
    Inventors: Louis J. Rossi, Sunita P. Chavan
  • Patent number: 5332645
    Abstract: A method of manufacturing improved strontium or barium ferrite carrier particles for use in two-component electrographic developer compositions for the development of electrostatic charge patterns is provided in which the tendency toward early life dusting of the strontium or barium ferrites is reduced.Such strontium or barium ferrite carrier particles are obtained by (i) mixing unreacted particles of iron oxide and barium or strontium oxide or, alternatively, a salt of barium or strontium convertible to the corresponding oxide by heat upon subsequent firing in a mole ratio of iron oxide to the metal oxide or salt of exactly 5.95 to 6.0:1 with an organic binder and a polar solvent, preferably water, to form a slurry, (ii) spray drying the slurry to obtain green beads of substantially uniform particle size and substantially spherical shape, and (iii) firing the beads at a temperature of from 1150.degree. to 1175.degree. C.
    Type: Grant
    Filed: September 28, 1992
    Date of Patent: July 26, 1994
    Assignee: Eastman Kodak Company
    Inventors: Bijay S. Saha, James H. Anderson
  • Patent number: 5332637
    Abstract: N-hydroxyphthalimide as a charge-control agent for fusible, dry electrostatographic toners.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: July 26, 1994
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Steven M. Bonser, Hans W. Osterhoudt
  • Patent number: 5330869
    Abstract: This invention is directed to dry, negatively charged toner compositions and developer compositions which employ, as a charge-control agent, a compound selected from the group consisting of phthalimide, 4-aminophthalimide and 4-tert-butylphthalimide; as well as to methods of utilizing such compositions in electrostatographic imaging systems.
    Type: Grant
    Filed: August 31, 1993
    Date of Patent: July 19, 1994
    Assignee: Eastman Kodak Company
    Inventors: John C. Wilson, Steven M. Bonser, Hans W. Osterhoudt
  • Patent number: 5316882
    Abstract: A green bead composite for the manufacture of magnetic carrier particles for electrophotography is disclosed. The composite comprises a synthetic polyester or polyurethane as the binder for metal oxide and other metal salt particles. The dried, nonmagnetic green beads are prepared by a spray-drying process. The green beads so prepared are suitable for the production of magnetic carrier particles for electrophotographic development.
    Type: Grant
    Filed: April 23, 1993
    Date of Patent: May 31, 1994
    Assignee: Eastman Kodak Company
    Inventors: Shankar S. Bijay, Tsang J. Chen
  • Patent number: 5306592
    Abstract: Carrier particles of substantially uniform particle size and substantially spherical shape comprising hard magnetic ferrite material having a single-phase hexagonal crystalline structure of the formula:MO.cndot.(Fe.sub.2 O.sub.3).sub.x (A)where M is strontium or barium and x is 5 to 6 suitable for magnetic brush development of electrostatic charge patterns and having a reduced tendency towards early life dusting, are prepared by:(i) mixing an aqueous solution containing strontium ions and iron (III) ions or barium ions and iron (III) ions in amounts sufficient to provide the strontium ferrite or barium ferrite of formula (A);(ii) reacting the mixture formed in step (i) with an alkaline aqueous ammonium hydroxide solution having an alkalinity of at least 0.
    Type: Grant
    Filed: October 29, 1992
    Date of Patent: April 26, 1994
    Assignee: Eastman Kodak Company
    Inventor: Bijay S. Saha
  • Patent number: 5298355
    Abstract: A method is described for the preparation of electrostatographic toner particles which involves the surface treatment of a pigment by depositing thereon a coating of a low melting point hydrophobic semi-crystalline polyester wax.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: March 29, 1994
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Donna A. DiPrima, Louis J. Sorriero
  • Patent number: 5298356
    Abstract: A method is described for the preparation of electrostatographic toner particles which involves the surface treatment of a pigment by depositing thereon a coating of an elastomeric thermoplastic polymer.
    Type: Grant
    Filed: November 13, 1992
    Date of Patent: March 29, 1994
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Donna A. DiPrima
  • Patent number: 5296568
    Abstract: Toner fusing rolls with improved properties are formed with an outer layer comprising an addition-cured silicone elastomer. Such as elastomer is formed by crosslinking hydride substituted organopolysiloxanes and polyimides substituted with unsaturated hydrocarbon radicals.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: March 22, 1994
    Assignee: Eastman Kodak Company
    Inventors: Tsang J. Chen, Paul L. Nielsen
  • Patent number: 5292621
    Abstract: Electrostatographic toner materials are disclosed which contains a yellow pigment which is a metal coordination complex having the formula: ##STR1## wherein R is preferably hydrogen, or SO.sub.2 NHR.sup.2 (R.sup.2 being alkyl or aryl), Z is an electron withdrawing group, Z.sup.1 is preferably alkyl, aryl or N(R.sup.3).sub.2 (R.sup.3 being alkyl, aryl or hydrogen), Me is a coordinate metal ion and L is a ligand. These pigments are formulated with fusible polymeric binders to provide a toner which exhibits excellent triboelectric properties and improved yellow color and hue when utilized in the electrostatographic process to produce colored electrophotographic images.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: March 8, 1994
    Assignee: Eastman Kodak Company
    Inventors: Brian H. Johnston, Thomas H. Whitesides
  • Patent number: 5288582
    Abstract: A photoelectrographic element for electrostatic imaging, containing a conductive layer and a photosensitive layer, is produced using photosensitive layer materials which form a barrier to charge injection where exposed to ultraviolet radiation. As a result, exposed areas can be charged, while unexposed portions cannot. The photosensitive layer contains an organic photoconductor, an ultraviolet radiation sensitizer, and, optionally, an organic binder. A method of forming images with this photoelectrographic element is also disclosed.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: February 22, 1994
    Assignee: Eastman Kodak Company
    Inventors: Lawrence E. Contois, William Mey
  • Patent number: 5286592
    Abstract: Electrostatographic toner materials containing a cyan pigment which is a metal coordination complex of a substituted 6-heterocycloazo-3-pyridinol compound are disclosed. These pigments are formulated with fusible polymeric binders to provide a toner which exhibits excellent triboelectric properties and improved cyan color and hue when utilized in the electrostatographic process to produce colored electrophotographic images.
    Type: Grant
    Filed: May 27, 1992
    Date of Patent: February 15, 1994
    Assignee: Eastman Kodak Company
    Inventors: Brian H. Johnston, Thomas H. Whitesides
  • Patent number: 5284731
    Abstract: A method is provided for transferring electrostatically charged thermoplastic toner particles having a particle size less than about 8 micrometers from an element to a receiver within a transfer zone. The receiver is heated and contacted with the electrostatically charged toner particles on the element at a temperature sufficient to adhere the particles to one another at their points of contact, but insufficient to cause the toner particles to flow into a single mass. An electric field tending to force the charged toner particles toward the receiver is simultaneously applied to the transfer zone. The receiver is subsequently separated from the element.
    Type: Grant
    Filed: May 29, 1992
    Date of Patent: February 8, 1994
    Assignee: Eastman Kodak Company
    Inventors: Dinesh Tyagi, Alec N. Mutz
  • Patent number: 5283151
    Abstract: A method is described for the preparation of electrostatographic toner particles which involves the use of carnauba wax for treating the surface of a pigment employed The method involves recrystallizing carnauba wax from its natural state by dissolution in ethyl acetate and cooling to precipitate needle like structures The structures so obtained are then added to a mixture comprising a pigment, a polymer material, a solvent and optionally a charge control agent which mixture serves as the organic phase in a limited coalescence process. The toner particles produced in accordance with this method are non spherical in nature and evidence excellent fluidity and anti-blocking properties.
    Type: Grant
    Filed: May 28, 1992
    Date of Patent: February 1, 1994
    Assignee: Eastman Kodak Company
    Inventor: Domenic Santilli