Patents Assigned to Coates Electrographics Limited
  • Stabilized pigmented hot melt ink containing nitrogen-modified acrylate polymer as dispersion-stabilizer agent
    Patent number: 5221335
    Abstract: In the embodiments described in the specification, a stabilized, pigmented hot melt ink contains a thermoplastic vehicle, a coloring pigment, and a dispersion-stabilizing agent to inhibit settling or agglomeration of the pigment when the ink is molten comprising 1.5 to 20 weight percent of a nitrogen-modified acrylate polymer. A preferred dispersion-stabilizing agent is the nitrogen-modified methacrylate polymer marketed by Rohm and Haas as Plexol 1525.
    Type: Grant
    Filed: June 21, 1991
    Date of Patent: June 22, 1993
    Assignee: Coates Electrographics Limited
    Inventors: Kevin G. Williams, John P. N. Haxell, Derek E. Wilson
  • Transparent hot melt jet ink
    Patent number: 5185035
    Abstract: The transparent hot melt jet inks described in the specification include a coloring agent, a vehicle for the coloring agent including a thermoplastic nontransparent base material and a transparentizing agent containing a glycol ester of a C.sub.18-35 fatty acid, a glyceryl ester of a C.sub.18-36 fatty acid with metal soaps, a polyethylene wax having a molecular weight of 400 to 1200, a synthetic paraffin wax, or a linear alcohol with a molecular weight of 500 to 1000 or a mixture thereof, a microcrystalline or modified microcrystalline wax.
    Type: Grant
    Filed: July 29, 1991
    Date of Patent: February 9, 1993
    Assignee: Coates Electrographics Limited
    Inventors: Edward A. Brown, John P. N. Haxell, Michael A. Cockett
  • Low corrosion hot melt ink
    Patent number: 5066332
    Abstract: In the particular embodiments described in the specification, low-corrosion hot melt ink contains 0.5% to 10% by weight of a metallo-organic compound such as overbased calcium sulphonate, basic barium sulphonate and overbased sulphurized calcium alkyl phenate as a corrosion inhibitor. Such inks produce no significant corrosion of printing system components after extended exposure at elevated temperatures.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: November 19, 1991
    Assignee: Coates Electrographics Limited
    Inventors: Edward A. Brown, John P. N. Haxell, Derek E. Wilson
  • Dispersed pigmented hot melt ink
    Patent number: 5053079
    Abstract: In the embodiments described in the specification, a dispersed, pigmented hot melt ink contains a thermoplastic vehicle, a colored pigment, and a dispersing agent to inhibit settling or agglomeration of pigment when the ink is molten comprising an isocyanate-modified microcrystalline wax or lignite wax in an amount of 2 to 100 weight percent of the weight of the vehicle. Preferred is the isocyanate-modified microcrystalline wax marketed as Petrolite WB17.
    Type: Grant
    Filed: May 23, 1990
    Date of Patent: October 1, 1991
    Assignee: Coates Electrographics Limited
    Inventors: John P. N. Haxell, Edward A. Brown, Derek E. Wilson