Ink Patents (Class 260/DIG38)
  • Patent number: 6160034
    Abstract: The present invention provides a low-bleed coloring composition incorporating a film-forming agent, an alkali-soluble resin, an aqueous carrier, and a colorant. The coloring composition can optionally include one or more of a humectant, a surfactant, a preservative, a drying agent, a pH regulant, a bittering agent or a fragrance. The present invention further provides a mark upon the surface of a substrate. The present invention furter provides a writing instrument comprising the coloring composition.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: December 12, 2000
    Assignee: Binney & Smith Inc.
    Inventors: Keith Allison, Richard Kaiser
  • Patent number: 6121365
    Abstract: Polymer fine particles are obtained by emulsion-polymerizing one or more monomers having a carboxylate group represented by the following formula and an unsaturated group that is radical polymerizable:--COO.sup.- X.sup.+ (I)wherein in the formula (I), X.sup.+ is one species selected from the group consisting of monovalent metal ion, ##STR1## wherein R.sub.1 to R.sub.5 may be the same or different, representing hydrocarbon groups having a number of carbon atom or atoms of 1 to 4 respectively. Alternatively, polymer fine particles may be obtained by performing emulsion polymerization in the presence of a compound containing the foregoing carboxylate group. In the obtained polymer fine particles, the carboxylate group is incorporated into surfaces of the fine particles by the aid of covalent bond or physical adsorption. Metallic parts such as those contained in a printer are not corroded owing to the presence of the carboxylate group on the surfaces of the fine particles.
    Type: Grant
    Filed: December 30, 1998
    Date of Patent: September 19, 2000
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Shouji Saibara, Kouji Takazawa
  • Patent number: 6075070
    Abstract: A marking instrument includes a non-erasable ink including a colorant and a solvent having a water content of about 0-15% by weight and a viscosity of about 15 to 4,500 cps.
    Type: Grant
    Filed: September 3, 1996
    Date of Patent: June 13, 2000
    Assignee: The Gillette Company
    Inventors: Nan-Jae Lin, Andrew R. Klassman, Roy Nicoll, Charles Christopher Packham, Vliet Hulse, John Thompson
  • Patent number: 6063836
    Abstract: Color images with high fixation comparable to that of silver salt photographic images are formed on printing papers, using aqueous ink compositions by ink jet recording. Color images thus formed have high saturation and high resolution. An intercalated compound capable of fixing water-soluble dyes to a printing paper due to the intercalation based on ion-exchanging between them is incorporated into the dye-receiving layer 2 of the paper, on which color images are formed by ink jet recording using an aqueous ink composition containing a water-soluble dye. The content of the intercalated compound in the layer 2 is from 10 to 90% by weight. As the intercalated compound, montmorillonoids are preferred when water-soluble cationic dyes are used while hydrotalcite-group minerals are preferred when water-soluble anionic dyes are used.
    Type: Grant
    Filed: July 19, 1996
    Date of Patent: May 16, 2000
    Assignee: Sony Corporation
    Inventors: Kengo Ito, Yoshio Fujiwara
  • Patent number: 6060537
    Abstract: A water based ink composition which can be used effectively in various ink jet type printing arrangements and on a variety of predetermined substrate surfaces. Such ink composition being resistant to smearing and running when contacted by water after application and drying on such substrate surfaces. This water based ink composition comprising a dye material, having a predetermined color, which is present in the ink composition generally in a range of between about 0.1 weight percent and about 10.0 weight percent. Water is present in such ink composition generally in a range of between about 50.0 weight percent and about 80.0 weight percent. There is a substantially water compatible organic solvent compound for dissolving such dye material therein. The organic solvent compound is present in such ink composition generally in a range of between about 10.0 weight percent and about 40.0 weight percent.
    Type: Grant
    Filed: December 21, 1998
    Date of Patent: May 9, 2000
    Assignee: Matthews International Corporation
    Inventors: George B. Due, John W. Standard, Michael E. OBrien
  • Patent number: 6040358
    Abstract: Inks for ink jet printers contain an aqueous carrier medium; a colorant that is insoluble in the aqueous carrier, a polymer dispersant; and a linear polymer additive selected from the group consisting of an water soluble, elastomeric ABA block polymer comprising an elastomeric B block and non-elastomeric A blocks; anionic polymers selected from neutralized acrylic and methacrylic acid polymers; cationic polymers selected from neutralized or quaternized amine polymers; water-dispersible .beta.-diketone containing polymers and ethylene oxide containing polymers.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: March 21, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Loretta Ann Grezzo Page, Harry Joseph Spinelli, Waifong Liew Anton
  • Patent number: 6034154
    Abstract: The present invention provides polymer fine particles for a jet ink, each polymer fine particle containing a colorant, wherein the polymer fine particles have an average particle diameter in the range of 5 to 700 nm, a maximum particle diameter of at most 1000 nm, and a particle size distribution, at m value of shape parameter according to the Weibull distribution, of at least 1.3, and wherein the polymer fine particles are able to form a coating film at room temperature.
    Type: Grant
    Filed: February 9, 1996
    Date of Patent: March 7, 2000
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Mitsuo Kase, Hidetoshi Konno, Isao Tabayashi, Ichiro Muramatsu
  • Patent number: 6025412
    Abstract: An ink for ink jet printing includes particles of an emulsifiable dye-polymer resin dispersed in a liquid vehicle, wherein the emulsifiable dye-polymer resin includes a dye chemically attached to the polymer resin. The polymer resin contains a base chain, such as polyester, having attached thereto hydrophilic groups, such as alkali sulfonated groups, for emulsifying the resin in water. The dye may be attached within the base chain itself, or attached to the base chain as a side chain component.
    Type: Grant
    Filed: September 29, 1995
    Date of Patent: February 15, 2000
    Assignee: Xerox Corporation
    Inventors: Guerino G. Sacripante, Marcel P. Breton
  • Patent number: 6020400
    Abstract: Inks for ink jet printers containing an aqueous carrier medium; a pigment; a polymeric dispersant; and an emulsion polymer additive stabilized with a structured polymer are stable, have low viscosity, exhibit excellent print quality, provide excellent smear resistance after drying, have good decap and crusting time, and also demonstrate good charging stability when used in continuous flow printers.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: February 1, 2000
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Waifong Liew Anton, Milan Bohuslav Bednarek, Robert Paul Held, Sheau-Hwa Ma, Joseph Edward Reardon, Arthur Charles Shor, Harry Joseph Spinelli, Soodabeh Tronson
  • Patent number: 6008270
    Abstract: A liquid ink jet ink wherein said ink is non-gelling and comprises a carrier, a pigment and a solid block copolymer of ethylene oxide and propylene oxide having a structure (A) and (B) defined herein.
    Type: Grant
    Filed: September 25, 1997
    Date of Patent: December 28, 1999
    Assignee: Eastman Kodak Company
    Inventor: Domenic Santilli
  • Patent number: 6005023
    Abstract: An ink for ink jet printers contains an aqueous carrier medium; a colorant that is insoluble in the aqueous carrier; a branched polymer dispersant; and an emulsion polymer additive and is stable, has low viscosity, exhibits excellent print quality, provides excellent smear resistance after drying and has good decap or crusting time.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: December 21, 1999
    Assignee: E.I. du Pont Nemours and Company
    Inventors: Waifong Liew Anton, Milan Bohuslav Bednarek, Soodabeh Tronson
  • Patent number: 5990199
    Abstract: The invention relates to indicator ink compositions that contain a water-based dispersion of a phenol-formaldehyde resin, at least one colorant and an amine-terminated catalyst. These indicator ink compositions are fixed to a surface, such as by drying, and respond to specific conditions of time, temperature, humidity, pressure and the presence or absence of certain chemicals by changing color. Compositions provide a means for detecting exposure to a predetermined condition and can be fixed or otherwise attached to nearly any article or designed into patterns on materials. Exposure of the indicator ink to the specific condition, the indicator ink provides a permanent detectable record of the event. Further, by varying the amount of amine-terminated catalyst in the formulation, the specific conditions at which the indicator composition will change color can be altered. Such compositions are specifically useful for determining the effectiveness of a sterilization process.
    Type: Grant
    Filed: April 19, 1995
    Date of Patent: November 23, 1999
    Assignee: North American Science Associates, Inc.
    Inventors: John R. Bealing, Joel R. Gorski
  • Patent number: 5981625
    Abstract: The present invention provides a newspaper printing ink that has rub off resistance; is fast drying on the paper; does not mist or dry on the press; offers excellent printability, high color strength, good water balance, and sharp half tone reproduction; and is relatively inexpensive. The present invention provides an ink concentrate suitable for preparing the printing ink, the ink concentrate comprising a colorant having a particle size of from about 0.01 .mu.m to about 25 .mu.m, a hydrocarbon resin, and a binder resin selected from the group consisting of a polyamide-oil polymer and a polyester-oil polymer. The present invention further provides a printing ink comprising a colorant having a particle size of from about 0.01 .mu.m to about 25 .mu.m, a vegetable oil, a polyamide-oil polymer, and a styrene-acrylic copolymer. The present invention further provides a printing ink comprising a naphthenic oil, a colorant having a particle size of from about 0.01 .mu.m to about 25 .mu.
    Type: Grant
    Filed: May 2, 1996
    Date of Patent: November 9, 1999
    Assignee: Videojet Systems International, Inc.
    Inventors: Wan Kang Zou, Xiaomang Wang, Qiao Qiao Dong
  • Patent number: 5969005
    Abstract: The present invention provides an ink which provides an image with a sufficient image density free from bleeding and unevenness, dries rapidly on paper and can be jetted at a high reliability and a recording method using said ink. A novel ink for ink jet recording comprising water, a coloring material and a water-soluble organic solvent is provided, characterized in that said ink comprises a polymer containing a carboxyl group having an average molecular weight of from 1,000 to 20,000 in the free or salt state in an amount of from 0.1 to 3% by weight, a water-soluble organic compound which normally stays solid and vaporizes in a proportion of not less than 50% by weight at a temperature of from 100.degree. C. to 350.degree. C. in an amount of from 1 to 20% by weight, and a compound represented by the following formula (A):R--O--X.sub.n H (A)wherein R represents a functional group selected from the group consisting of C.sub.
    Type: Grant
    Filed: July 7, 1997
    Date of Patent: October 19, 1999
    Assignee: FUJI XEROX Co., LTD
    Inventors: Yoshiro Yamashita, Ken Hashimoto, Hiroshi Inoue
  • Patent number: 5969004
    Abstract: A method of making an emulsion ink is provided. The method includes mixing an ink precursor and processing the ink precursor in a homogenizer to form an emulsion ink. The ink precursor includes a pigment, water, a film forming polymer, an oil and, preferably, a pH dependent thickener and a base.
    Type: Grant
    Filed: October 15, 1993
    Date of Patent: October 19, 1999
    Assignee: The Gillette Company
    Inventor: Rachel M. Loftin
  • Patent number: 5962552
    Abstract: Described are an ink composition comprising water, a colorant and acrylic silicone resin particles having alkoxysilyl groups; and an image recording method comprising discharging the droplet of an ink composition from a recording head to record an image on a substrate, wherein an ink composition comprising water, a colorant and acrylic silicone resin particles having alkoxysilyl groups is used as the ink composition. According to the present invention, 1) blotting of the ink composition on the substrate can be prevented, 2) an image which has water resistance and has a markedly high image density can be obtained, 3) an image does not become sticky even under a high environmental temperature, and 4) there is no problem in safety.
    Type: Grant
    Filed: February 21, 1997
    Date of Patent: October 5, 1999
    Assignee: Fuji Xerox Co., Ltd.
    Inventors: Takeshi Mikami, Yuzuru Fukuda
  • Patent number: 5955515
    Abstract: Disclosed herein is a water-based ink for ink-jet, comprising a liquid composition containing a coloring material and a liquid medium, wherein the ink comprises a heat-reversible type thickening polymer.
    Type: Grant
    Filed: September 26, 1995
    Date of Patent: September 21, 1999
    Assignee: Canon Kabushiki Kaisha
    Inventors: Isao Kimura, Hiroyuki Maeda, Hidemi Kubota, Tatsuya Ohsumi
  • Patent number: 5939475
    Abstract: A novel pourable organophilic clay polyamide composition useful as a rheological additive for organic fluid system comprisinga) from about 5 to 15 weight percent of an organophilicly modified smectite-type clay,b) from about 25 to about 35 weight percent of one or more rheologically active polyamides andc) from about 40 to 60 weight percent of one or more organic solvents preferably selected from the group consisting of n-propanol, toluene and mineral spirits.The organophilic clay polyamide composition is used in non-aqueous fluid systems such as paints, inks, and coatings to provide improved rheological properties to the system.
    Type: Grant
    Filed: September 3, 1996
    Date of Patent: August 17, 1999
    Assignee: Rheox, Inc.
    Inventors: William Reynolds, Glen Hawthorne
  • 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: 5929135
    Abstract: This invention provides a ball-point pen suited to low-viscosity aqueous ink. This ball-point pen includes a ball-point pen refill in which an ink reservoir communicates with a tip for holding a tip ball via a joint, wherein the ink reservoir is filled with water type ball-point pen ink containing at least one type of a solvent selected from the group consisting of ethyleneglycol, diethyleneglycol, propyleneglycol, and glycerin in an amount of 5 to 40 wt % of the total ink amount, a crosslinking acrylic acid polymer in an amount of 0.1 to 1.0 wt % of the total ink amount, a pigment in an amount of 5 to 10 wt % of the total ink amount, and the balance primarily consisting of water, and the tip has a spring which in a normal state urges and brings the tip ball into intimate contact with the inner edge of a ball holding portion at the front end of the tip and releases the intimate contact when writing is performed.
    Type: Grant
    Filed: July 3, 1997
    Date of Patent: July 27, 1999
    Assignee: Mitsubishi Pencil Kabushiki Kaisha
    Inventors: Eiji Wasai, Kazuhiko Furukawa
  • Patent number: 5925693
    Abstract: Correction fluids are provided which include a cationic stain blocking agent, an opacifying pigment and water. Preferred opacifying pigments include an alumina treated titanium dioxide and a clay. The new correction fluids have improved bleed resistance and hiding power.
    Type: Grant
    Filed: January 20, 1998
    Date of Patent: July 20, 1999
    Assignee: The Gillette Company
    Inventor: Norman G. Sanborn
  • Patent number: 5919838
    Abstract: Methods for preparing an ink concentrate are disclosed. To prepare the ink concentrate, a varnish that includes at least one dispersing polymer is added to the pigment particles, such as an aqueous slurry or an organic-solvent-treated aqueous slurry of the pigment particles. The blend of varnish and pigment particles then is heated to a temperature effective to melt the dispersing polymer. Upon cooling, the dispersing polymer solidifies at the surface of the pigment particles to thereby physically attach and bond to and preferably encapsulate the pigment particles and form an ink concentrate. The ink concentrate thus formed will have improved color properties as compared to conventional ink concentrates.
    Type: Grant
    Filed: January 16, 1996
    Date of Patent: July 6, 1999
    Inventor: Yoshikazu Mizobuchi
  • Patent number: 5912280
    Abstract: Water-fastness of inks containing pigment and a polymeric dispersant is improved by the addition of core-shell or tetrafluoroethylene emulsion polymers. The printed ink images exhibit improved resistance to smudge or smear when handled or marked with highlight pens.
    Type: Grant
    Filed: December 27, 1996
    Date of Patent: June 15, 1999
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Waifong Liew Anton, Milan Bohuslav Bednarek, Edward George Howard, Jr., Kathryn Amy Pearlstine, Soodebeh Tronson
  • Patent number: 5900445
    Abstract: An erasable ink composition contains a water-insoluble polymeric dye obtained by copolymerizing ethylenically unsaturated monomers at least one of which possesses a dye moiety covalently bonded thereto. The ink is intended for use in any of a variety of marking instruments, in particular, a ball-point pen.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: May 4, 1999
    Assignee: BIC Corporation
    Inventors: Wayne A. Chandler, David C. Villiger, Aiying Wang, Jeffery H. Banning, Barry W. Chadwick
  • Patent number: 5880176
    Abstract: A fluorescent marking composition containing particles of an organic material which has a glass transition temperature of at least 30.degree. C. and an average particle size of at least 30 nm, and emitting fluorescence in a visible light range, or absorbing infrared light having a wavelength of at least 700 nm and emitting a light in an infrared wavelength range, which composition is excellent in dispersion stability, light resistance, and heat and light resistance, and provides a mark which does not bleed.
    Type: Grant
    Filed: October 20, 1995
    Date of Patent: March 9, 1999
    Assignee: Hitachi Maxell, Ltd.
    Inventors: Takanori Kamoto, Yoshinori Yamamoto, Toshinobu Sueyoshi
  • Patent number: 5880214
    Abstract: An emulsion ink for stencil printing is disclosed which enlarges the selection region of a body to be printed on, improves the handling property and adds a building-up feeling and a brilliance to the printed letters and others by developing the drying property, sticking tendency and preservation stability of the ink. The emulsion ink for stencil printing is characterized by using an oil-in-water type resin emulsion as a water phase in the water-in-oil type emulsion ink consisting of an oil phase and a water phase, and it is further characterized in that the minimum film-making temperature for the oil-in-water type resin emulsion described above is 40.degree. C. or less and its compound ratio is 2-45 wt.% as a reduced solid basis of the total amount of the avaiable emulsion ink.
    Type: Grant
    Filed: September 26, 1997
    Date of Patent: March 9, 1999
    Assignee: Riso Kagaku Corporation
    Inventor: Sadanao Okuda
  • Patent number: 5863966
    Abstract: Radiation-curing printing inks which comprise organopolysiloxanes of the general formula ##STR1## in which R.sup.1 =an alkyl radical having 1 to 8 carbon atoms,R.sup.2 =a group of the formula--CH.sub.2 --CH.sub.2 --C(O)O--R--(OC(O)--CH.dbd.CH.sub.2).sub.x-1and/or--CH.dbd.CH--C(O)O--R--(OC(O)--CH.dbd.CH.sub.2).sub.x-1in which x is an integer and is at least 2, and R is a hydrocarbon radical which optionally has alkoxy groups,R.sup.3 =R.sup.1 or R.sup.2,n=30 to 150,m=0 to 3, preferably 0,in quantities of from 0.01 to 3% by weight, based on the ink formulation.
    Type: Grant
    Filed: September 6, 1996
    Date of Patent: January 26, 1999
    Assignee: Th. Goldschmidt AG
    Inventors: Thomas Ebbrecht, Georg Feldmann-Krane, Peter Lersch, Stefan Silber
  • Patent number: 5859092
    Abstract: A recording liquid containing an aqueous medium, a pigment and a polymer, wherein the polymer comprises at least one polymer containing a repeating unit A having at least one of a carboxyl group and an acid anhydride group and an allylether unit B of the formula (I), ##STR1## wherein R.sub.1 and R.sub.2 are a hydrogen atom or a substituted or unsubstituted C.sub.1 -C.sub.5 alkyl group, R.sub.3 is a hydrogen atom, an alkyl group, an alkylcarbonyl group, an alkenyl group, an alkenylcarbonyl group, an aryl group, an arylcarbonyl group, an aralkyl group, an aralkylcarbonyl group, a cycloalkyl group, a cycloalkylcarbonyl group, a heterocyclic group or a carbonyl group having a heterocyclic group, and these groups other than a hydrogen atom may have a substituent, and n is from 1 to 50.
    Type: Grant
    Filed: April 18, 1997
    Date of Patent: January 12, 1999
    Assignee: Mitsubishi Chemical Corporation
    Inventors: Takashi Hirasa, Hiroshi Takimoto, Yukichi Murata, Hiroshi Mikami, Shoji Toki
  • Patent number: 5858595
    Abstract: Low optical density magnetic fluid which is a stable dispersion of fine magnetic particles. A method of forming the stable dispersion which includes providing an ion exchange resin, loading the ion exchange resin with an ion capable of forming a magnetic phase, treating the loaded resin to form magnetic particles and micronizing the resin and magnetic particles in a fluid to form an aqueous stable colloid. The invention provides submicron particles and submicron particles which are dispersed in an aqueous colloid. A method of forming the stable dispersion which includes providing an ion exchange resin, loading the ion exchange resin with an ion, treating the loaded resin to form nanoscale particles. Fluidizing the resin and particles to form an aqueous stable colloid. A method of forming magnetic materials having tunable magnetic properties and the magnetic materials formed thereby.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: January 12, 1999
    Assignee: Xerox Corporation
    Inventor: Ronald F. Ziolo
  • Patent number: 5854308
    Abstract: Water-based pigmented ink formulations are disclosed including a water soluble or water dispersible silicone-containing polymer additive comprising a vinyl silicone polymer. The additive significantly reduces kogation, mudcracking, and banding in some or all of the pigmented ink formulations.
    Type: Grant
    Filed: February 29, 1996
    Date of Patent: December 29, 1998
    Assignee: Minnesota Mining And Manufacturing Company
    Inventors: Richard J. Kuo, Smarajit Mitra, Charles E. Boyer, III, Daniel B. Pendergrass, Jr.
  • Patent number: 5852073
    Abstract: An erasable ink composition contains a dispersion of solid particles of water-insoluble polymer-encapsulated colorant obtained from the emulsion polymerization of at least one emulsion-polymerizable monomer in the presence of solid colorant particles. The ink is intended for use in any of a variety of marking instruments, in particular, a ball-point pen.
    Type: Grant
    Filed: May 20, 1996
    Date of Patent: December 22, 1998
    Assignee: Bic Corporation
    Inventors: David C. Villiger, Aiying Wang, Jeffery H. Banning, Wayne A. Chandler, Barry W. Chadwick
  • Patent number: 5849814
    Abstract: An ink composition according to the present invention comprises a pigment, a pigment dispersion resin, an non-aqueous ambient temperature non-volatile liquid removal agent and an non-aqueous ambient temperature volatile organic solvent, wherein the amount of the pigment dispersion resin relative to that of the pigment is within the range of from about 2 to about 10%. Methods of making the ink composition and methods of applying the ink composition to a writing board also are disclosed. The ink composition is superior in time-erasion performance independent of the object and/or surface of the writing board.
    Type: Grant
    Filed: December 26, 1995
    Date of Patent: December 15, 1998
    Assignee: Sakura Color Products Corporation
    Inventor: Hisanori Fujita
  • Patent number: 5847026
    Abstract: A recording ink which includes at least water, a pigment as a colorant, polyvinyl pyrrolidone as a water-soluble polymer, and a compound having a polyoxyethylene chain. The compound having a polyoxyethylene chain may be replaced by a compound having a fluorinated hydrocarbon group.
    Type: Grant
    Filed: November 21, 1996
    Date of Patent: December 8, 1998
    Assignee: Brother Kogyo Kabushiki Kaisha
    Inventors: Takeo Kitahara, Shunichi Higashiyama
  • Patent number: 5837754
    Abstract: Ink for an ink-jet printer of the present invention includes polyester particles colored with a colorant which are dispersed in an aqueous medium.
    Type: Grant
    Filed: October 3, 1996
    Date of Patent: November 17, 1998
    Assignee: Toyo Boseki Kabushiki Kaisha
    Inventors: Tetsuo Shimomura, Satoshi Maeda, Yozo Yamada
  • Patent number: 5814683
    Abstract: The substantial reduction of aerosol generation in ink-jet printing is achieved with the addition of a viscoelastic polymer to ink-jet ink compositions. The viscoelastic polymer component is employed at a concentration within the range of 5 to 10 ppm. Examples of suitably employed viscoelastic polymers are polyacrylamides having weight average molecular weights ranging from about 10,000 to 5,000,000 and polyvinylpyrrolidones having molecular weights ranging from about 3,000 to 1,000,000, as well as mixtures thereof. The addition of a viscoelastic polymer component serves to increase the extensional viscosity and the surface tension of the ink, thereby preventing or at least delaying the fragmentation of the tail of an ink droplet ejected by an ink-jet printer. Accordingly, any breakoff remnants are provided with sufficient mass and velocity such that trajectory control is not abandoned to aerodynamic forces.
    Type: Grant
    Filed: December 6, 1995
    Date of Patent: September 29, 1998
    Assignee: Hewlett-Packard Company
    Inventor: Bradley B. Branham
  • Patent number: 5804633
    Abstract: Permanent aqueous marker inks are provided which include surfactant, a pigment, a film-forming polymer, and water. The surfactant may be a combination of a hydrocarbon, preferably an alkylphenol ethyoxylate and a fluorocarbon, or it may be a silicone.
    Type: Grant
    Filed: June 5, 1995
    Date of Patent: September 8, 1998
    Assignee: The Gillette Company
    Inventors: Rachel M. Loftin, Kimberly Borelli Sanborn
  • Patent number: 5783710
    Abstract: The present invention relates to benzothioxanthene dyes of the formula I, ##STR1## in which R.sup.1 is SO.sub.3.sup..crclbar. M.sup..sym. or SO.sub.2 NR.sup.4 R.sup.5, R.sup.2 and R.sup.3 independently of one another are hydrogen, SO.sub.3.sup..crclbar. M.sup..sym. or SO.sub.2 NR.sup.4 R.sup.5 and X, Y, n, R.sup.4, R.sup.5 and M.sup..sym. are as defined in claim 1, to their preparation and to their use, especially in inks and recording liquids.
    Type: Grant
    Filed: March 10, 1997
    Date of Patent: July 21, 1998
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Wolfgang Bauer, Dieter Baumgart, Walter Zoller
  • Patent number: 5767172
    Abstract: Water base ink compositions for directly filling in a ball-point pen comprising a dyestuff in the range of 3% to 10% by weight; a humectant in the range of 10% to 40% by weight; thixotropic agent in the range of 0.6% to 1.0% by weight, being composed of a cross-linkable acrylic acid polymer having a molecular weight ranging from 2,000,000 to 6,000,000; and water as a balance the water base ink compositions have no spinnability, tackiness tendency and possibility of drippings and runnings from a pen-point, and can be directly filled into a ball-point pen.
    Type: Grant
    Filed: June 6, 1996
    Date of Patent: June 16, 1998
    Assignee: Kabushiki Kaisha Pilot
    Inventor: Teruaki Fukasawa
  • Patent number: 5756561
    Abstract: An erasable ink composition contains a water-insoluble polymeric dye obtained by the graft polymerization of a preformed water-insoluble polymer with a dye monomer possessing at least one ethylenically unsaturated site. The ink is intended for use in any of a variety of marking instruments, in particular, a ball-point pen.
    Type: Grant
    Filed: June 4, 1996
    Date of Patent: May 26, 1998
    Assignee: BIC Corporation
    Inventors: Aiying Wang, Jeffery H. Banning, Wayne A. Chandler, David C. Villiger, Barry W. Chadwick
  • Patent number: 5750594
    Abstract: Bleed between two adjacent inks on a printing medium may be reduced by selecting inks having the same ionic character, at least one ink containing an aqueous carrier medium and a pigment dispersion wherein the dispersant is a quaternized amine containing polymeric dispersant, and wherein the second ink contains an aqueous carrier medium, a colorant and optionally a polymer, wherein the colorant or the polymer has a sulfonate or phosphonate group. A process for alleviating bleed in printed elements comprising applying the first and second inks to a substrate in contact with each another is also described.
    Type: Grant
    Filed: March 19, 1997
    Date of Patent: May 12, 1998
    Assignee: E. I. du Pont de Nemours and Company
    Inventors: Loretta Ann Grezzo Page, Kathryn Amy Pearlstine
  • Patent number: 5750592
    Abstract: An ink composition for intermediate transfer ink jet recording, comprising water, a pigment, a colloidal dispersion resin, a volatile alkali component and a water-soluble organic solvent. The ink composition provides an excellent print quality and a good fixing strength independently of the kinds of recording media.
    Type: Grant
    Filed: August 3, 1993
    Date of Patent: May 12, 1998
    Assignee: Seiko Epson Corporation
    Inventors: Masakazu Shinozuka, Yoshinori Miyazawa, Makoto Fujino, Tatsuya Ito, Osamu Ishibashi
  • Patent number: 5750593
    Abstract: A stabilized electrocoagulation printing ink comprises a liquid colloidal dispersion containing an electrolytically coagulable colloid, a dispersing medium, a soluble electrolyte, a coloring agent and a sequestering agent for completing metal ions generated during electrocoagulation printing. The sequestering agent is present in an amount to prevent the metal ions from causing the colloid to undergo undesirable cross-linking, without adversely affecting electrocoagulation of the colloid.
    Type: Grant
    Filed: January 23, 1995
    Date of Patent: May 12, 1998
    Assignee: Elcorsy Technology Inc.
    Inventors: Adrien Castegnier, Normand Lepine
  • Patent number: 5747555
    Abstract: A method of making a water-based publication gravure ink is provided wherein a polyamide resin or a mixture of the polyamide resin and a second resin is ground to produced a ground resin, and then the ground resin is mixed with water, a base, and a colorant. The resin/water/base/colorant mixture is then milled to produce a color dispersion, which is then mixed with an emulsion and water to produce a press-ready ink. Preferably, the water, the base and a dispersant are mixed first, and then combined with the colorant to produce a colorant slurry. The colorant slurry is then mixed with the ground resin, and milled to produce a slurry color dispersion. Also provided are water-based publication gravure inks made according to the methods outlined above, and a water-based publication gravure ink including water, a colorant, a mixture of a polyamide and a resin other than the polyamide resin, a base, and a dispersant.
    Type: Grant
    Filed: April 10, 1996
    Date of Patent: May 5, 1998
    Assignee: R. R. Donnelley & Sons Co.
    Inventors: Gerald Wouch, Gary Procknow
  • Patent number: 5741591
    Abstract: A encapsulation method applicable to pharmaceutical preparations, cosmetics, pigment imparting materials such as inks, paints, dyes, electrostatic toner, and others is disclosed, as are methods of use thereof. According to the disclosed method, the use of auxiliary materials such as emulsifiers or surfactants can be dispensed with, and ultramicrocapsules having a readily controllable diameter of 1 .mu.m and less can be produced. The disclosed method includes the steps of preparing an organic phase consisting of a mixture of one or more hydrophobic liquid and/or solid materials and self dispersable resin which through the action of an aqueous phase, self disperses into particles with a diameter of 0.1 .mu.m and less; combining an aqueous phase with the organic phase, whereby self emulsification takes place, thereby encapsulating the one or more hydrophobic liquid and/or solid materials.
    Type: Grant
    Filed: October 17, 1995
    Date of Patent: April 21, 1998
    Assignee: Dainippon Ink and Chemicals, Inc.
    Inventors: Nansei Tashiro, Osamu Maruyama
  • Patent number: 5723514
    Abstract: The invention relates to a heatset intaglio printing ink especially suited for the intaglio printing of security documents such as currency, postage stamps, stock certificates, bank notes and the like. The ink comprises: a) an epoxy resin ester reacted with an unsaturated monobasic acid and a reactive monomer, b) a glycol and/or glycol ether, c) a pigment, d) a drier and e) a compound obtained by reacting an amine/epoxy adduct with a phenolic resin or polyhydric phenol compound.
    Type: Grant
    Filed: June 13, 1995
    Date of Patent: March 3, 1998
    Assignee: Sun Chemical Corporation
    Inventors: Solomon J. Nachfolger, Hugo Babij, Joseph Malanga, Ralph H. Reiter, Walter J. Glesias
  • Patent number: 5721313
    Abstract: A composition comprising a water-in-oil polymer emulsion wherein the polymer is the reaction product of the following:(a) an ethylenically unsaturated carboxylate having between about 3 and about 6 carbon atoms;(b) an ethylenically unsaturated monomer which is nonionic in nature;(c) an ethylenically unsaturated monomer containing one or more sulfonate or sulfoalkyl groups;(d) an ethylenically unsaturated monomer having surface active properties; and(e) a crosslinking agent is provided. The composition has a multiple number of uses, such as in ink, pigment or dye thickening.
    Type: Grant
    Filed: November 2, 1995
    Date of Patent: February 24, 1998
    Assignee: Rhone-Poulenc Inc.
    Inventors: Dominic Wai-Kwing Yeung, Dipak Lad
  • Patent number: 5719204
    Abstract: The invention relates to polymeric dispersants used in formulating aqueous ink compositions, as well as inks containing those dispersants. The dispersants are graft copolymers comprising a hydrophilic polymeric segment, a hydrophobic polymeric segment incorporating a hydrolytically-stable siloxyl substituent, and a stabilizing segment, such as a reactive surfactant macromer, a protective colloid macromer, or a non-siloxyl hydrophobic monomer. The inks made with these dispersants show excellent stability, print characteristics, water-fastness, light-fastness, optical density, and in-use maintenance characteristics.
    Type: Grant
    Filed: June 20, 1996
    Date of Patent: February 17, 1998
    Assignee: Lexmark International, Inc.
    Inventors: Bradley Leonard Beach, Anna Marie Pearson, Jing Xiao Sun, Richard B. Watkins
  • Patent number: 5716217
    Abstract: A water base ink composition for writing on neon boards which comprises:(a) water in amounts of not less than 30% by weight;(b) hollow resin particles dispersed in the water, in amounts of 0.5-50% by weight;(c) a resin which is film-forming at room temperatures in amounts of 0.5-30% by weight; and(d) an aqueous emulsion of at least one nonvolatile or only slightly volatile compound which is liquid at room temperatures and is selected from the group consisting of aliphatic carboxylic acid esters, higher hydrocarbons and higher alcohols in dry amounts of 0.5-25% by weight.Writings or marking formed with the ink composition on transparent panels such as of polymethyl methacrylate are intensely and vividly brightened when the side face receives light incident perpendicularly into the panel, as the panels are called "neon boards".
    Type: Grant
    Filed: May 25, 1995
    Date of Patent: February 10, 1998
    Assignee: Sakura Color Products Corp.
    Inventors: Kiyotaka Imagawa, Yasuji Okuda
  • Patent number: 5712328
    Abstract: An aqueous ball point ink composition comprising a key aqueous ball point ink composition comprising coloring materials consisting of (pigment and pigment dispersant) and/or precolored emulsion resin, water-soluble organic solvent, pseudoplastic imparting agent and water and cross-linked polyacrylate salt in a proportion of about 0.05-0.5% by weight based on the amount of said key aqueous ball point ink composition.
    Type: Grant
    Filed: November 12, 1996
    Date of Patent: January 27, 1998
    Assignee: Sakura Color Products Corporation
    Inventors: Shigeyasu Inoue, Toshimitsu Kawasumi
  • Patent number: 5698614
    Abstract: A fluorescent ink composition which comprises:(a) an organic solvent which comprises propylene glycol monomethyl ether as a solvent:(b) a solution type fluorescent pigment dissolved in the organic solvent; and(c) a ketone resin.
    Type: Grant
    Filed: June 7, 1995
    Date of Patent: December 16, 1997
    Assignee: Sakura Color Products Corporation
    Inventors: Hiroaki Ueda, Masakazu Yokoi, Yasushi Okuda