Patents Examined by Shalie Manlove
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Patent number: 6620233Abstract: Goniochromatic luster pigments are based on titanium dioxide-coated silicatic platelets which have been heated in a reducing atmosphere and which comprise at least one layer packet comprising A) a colorless coating having a refractive index n≦1.8 and B) a coating which has a refractive index n≧2.0, which includes iron(III) oxide and which selectively absorbs visible light.Type: GrantFiled: April 23, 2002Date of Patent: September 16, 2003Assignee: BASF AktiengesellschaftInventors: Oliver Seeger, Raimund Schmid, Norbert Mronga, Jörg Adel
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Patent number: 6616744Abstract: The present invention provides a method of forming inorganic pigments using one or more metal alloys. Metal alloys used in the method of the invention are preferably milled to a mean particle size of less than about 10 microns, may be mixed with other metal oxides, and calcined in the presence of oxygen in a rotary kiln. Inorganic pigments formed in accordance with the method of the invention can be used in a wide variety of applications, including the coloration of glass matrixes, ceramic bodies, polymers, and paints.Type: GrantFiled: April 17, 2002Date of Patent: September 9, 2003Assignee: Ferro CorporationInventors: Javier Garcia Sainz, Rosario Blanch Castello, Rafael Mena Pla, Juan Carlos Gallart
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Patent number: 6616746Abstract: The titanium dioxide pigment of this invention has on the titanium dioxide particle surface a coating layer comprising a polyhydric alcohol and a hydrolysis product of an aminosilane compound, has a dispersibility of not more than 20 kg/cm2 as judged in terms of resin pressure increase, and is excellent in hydrophobicity and dispersibility. The pigment is useful as a coloring agent for plastics which requires good lacing resistance and dispersibility.Type: GrantFiled: June 13, 2002Date of Patent: September 9, 2003Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Hideo Takahashi, Eiji Yamada, Toshihiko Akamatsu, Takeshi Fujimura
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Patent number: 6616749Abstract: A pigment product suitable for use in a coating composition to provide a gloss coating on paper, the pigment product comprising a processed particulate kaolin whose particles have a particle size distribution such that at least 80% by weight of the particles have an equivalent spherical diameter less than 2 &mgr;m and not less than 8%, preferably not less than 12%, by weight of the particles have an equivalent spherical diameter less than 0.25 &mgr;m and whose particles have a shape factor of at least 45, preferably at least 50.Type: GrantFiled: October 4, 2000Date of Patent: September 9, 2003Assignee: Imerys Pigments, Inc.Inventors: John Claude Husband, Desmond Charles Payton, Michele Susan Renals
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Patent number: 6616747Abstract: The process for producing granular hematite particles of the present invention, comprises passing an oxygen-containing gas through an aqueous ferrous nitrate solution in the presence of iron materials and hematite seed crystals at a temperature of 80 to 90° C., thereby obtaining reddish brown precipitates containing granular hematite particles as a main component; subjecting the reddish brown precipitates to filtration, water-washing and then drying; and heat-treating the reddish brown precipitates in air at a temperature of 450 to 900° C. In accordance with the process of the present invention, the granular hematite particles exhibiting a high purity, a small equilibrium water content and a reduced oil absorption can be produced using inexpensive iron raw materials without use of a specific device such as autoclave in an industrially and economically useful manner.Type: GrantFiled: April 1, 2002Date of Patent: September 9, 2003Assignee: Toda Kogyo CorporationInventor: Hiroshi Sumita
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Patent number: 6616745Abstract: A metal oxide-coated mica pearlescent pigment having a coating of copper chromite thereon is provided.Type: GrantFiled: July 17, 2002Date of Patent: September 9, 2003Assignee: Engelhard CorporationInventors: Samuel F. Narvarti, Mark E. Gall, Thomas V. Edwards, Frank A. Mazzella, William L. Howell, Jr.
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Patent number: 6616748Abstract: A high performance purified natural zeolite pigment composition for use in papermaking and paper coating is disclosed. Use of the pigment facilitates manufacture of coated ink jet and digital printing papers with improved quality and economics. The novel zeolite pigment composition can also be used as a supplementary pigment to improve the properties of coated paper and paperboard for flexographic and water-based gravure printing. When used as filler, the novel zeolite pigment composition is readily retained and eliminates print-through in uncoated papers. The novel zeolite pigment is low in abrasion and provides improved coefficient of friction. The novel zeolite pigment is also useful as a microparticulate retention aid in papermaking and as an additive to improve the performance of deinking processes.Type: GrantFiled: August 3, 2001Date of Patent: September 9, 2003Assignee: ZO Resources, LLCInventors: Charles P. Klass, Margaret K. Joyce
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Patent number: 6613139Abstract: Modified silica fillers are prepared by contacting silica with blends or mixtures containing diorganodihalosilanes and monoorganotrihalosilanes in weight ratios of 1:0.1 to 1:2, respectively. While dialkyldichlorosilanes and monoalkyltrichlorosilane such as dimethyldichlorosilane and methyltrichlorosilane, respectively, are most preferred, the blends or mixtures may also comprise compositions containing n-propyltrichlorosilane, phenyltrichlorosilane, cyanopropyltrichlorosilane, and mercaptopropyltriethoxysilane.Type: GrantFiled: July 18, 2002Date of Patent: September 2, 2003Assignee: Dow Corning CorporationInventor: Anthony Revis
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Patent number: 6610137Abstract: A pigment product suitable for use in a coating composition to provide a gloss coating on paper, the pigment product comprising a processed particulate kaolin produced from a naturally platy kaolin clay having a particle size distribution such that about 50% to 60% by weight of the particles have an esd less than 2 &mgr;m and less than 25% by weight of the particles have an esd less than 0.25 &mgr;m and a shape factor of at least 15. In processing, the crude kaolin is ground to a shape factor greater than 50 to produce even greater “platy” clay. The pigment product has a particle size distribution such that at least 80% by weight of the particles have an esd less than 2 &mgr;m and greater than 12% and less than 35% by weight of the particles have an esd less than 0.25 &mgr;m and whose surface area is greater than 12 m2/g when measured by the BET method.Type: GrantFiled: August 26, 2002Date of Patent: August 26, 2003Assignee: Imerys Pigments, Inc.Inventors: Christopher R. L. Golley, Daniel John Panfil, Harry Vincent Brown, Jr., John Claude Husband
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Patent number: 6605147Abstract: The use of surface-coated rutile modification TiO2 pigments having a primary particle grain size d50 of 0.1 to 1.0 &mgr;m as an anticorrosive white pigment, with firstly magnesium phosphate and secondly aluminum oxides and/or aluminum hydroxides being precipitated onto the TiO2 pigments, is described.Type: GrantFiled: June 14, 2002Date of Patent: August 12, 2003Assignee: Sachtleben Chemie GmbHInventors: Thomas Rentschler, Jochen Winkler
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Patent number: 6599355Abstract: The invention relates to interference pigments with a great color strength that are based on multicoated platelet-shaped substrates that have at least one series of layers from (A) a highly refractive coating that consists of a mixture of TiO2 and Fe2O3 in ratio of 1:0.1 to 1:5 and optionally one or more metal oxides in amounts of ≦20% by weight based on layer (A), (B) a colorless coating with a refractive index n≦1.8, (C) a colorless coating with a refractive index of n 1.8, (D) an absorptive coating with a refractive index of n 1.8, and optionally (E) an outer protective layer.Type: GrantFiled: April 26, 2002Date of Patent: July 29, 2003Assignee: Merck Patent GmbHInventors: Christoph Schmidt, Klaus Bernhardt, Sabine Schoen, Dieter Heinz
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Patent number: 6589648Abstract: A roll of material, e.g., thermoplastic ribbon comprises a hollow core made of a plastic strip of which the ends are mutually joined by overlapping, and the core's outer surface facing the material to be wound being of a nature opposing slippage of the material on it. The plastic strip includes an adhesive-coated foil of which the adhesive-fitted surface forms the outer core surface facing the material. The first winding layer facing the core bonds to this core and, as a result, the finished roll is made mechanically strong and this strength can be enhanced by an adhesive-coated plastic foil tautly enclosing the outside of the roll and fitted with a projecting, adhesive free or adhesive-neutralized tear-open tab.Type: GrantFiled: May 26, 1999Date of Patent: July 8, 2003Assignee: Signode Bernpak GmbHInventor: Karl Schurig
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Patent number: 6589331Abstract: The present invention deals with metal oxide coated, flake shaped soft iron pigments. The characteristic feature is a reflector substrate, which is produced by deformation of reduced carbonyl iron powder. The pigments are colorful, display metallic luster and a high magnetic permeability. They can be oriented in the medium by means of an external magnetic field. The novel pigments find use in the decorative and/or functional field, particularly in lacquers, paints, plastics, in printing, in glass, ceramics and in cosmetics.Type: GrantFiled: March 25, 2002Date of Patent: July 8, 2003Assignee: Eckart GmbH & Co. KGInventors: Werner Ostertag, Stefan Trummer, Frank Henglein, Klaus Greiwe
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Patent number: 6585822Abstract: Novel nanosized kaolin clay particles are prepared by agitating a fine particle size fraction of kaolin clay in a Netzsch mill until the particle size is reduced, aspect ratio is decreased and surface area is increased. The ultrafine kaolin particles are especially useful as a pigment to provide high surface gloss to ink jet printing papers.Type: GrantFiled: January 5, 2001Date of Patent: July 1, 2003Assignee: Engelhard CorporationInventors: Richard R. Berube, Michael G. Londo, Sathanjheri A. Ravishankar
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Patent number: 6582507Abstract: A bismuth oxychloride effect pigment has a zinc oxide or microfine titanium dioxide particulate at about the surface of the crystals of the bismuth oxychloride. The pigment is prepared by, for instance, growing the bismuth oxychloride crystals, and adding the particulate before the hydrolysis is complete.Type: GrantFiled: August 19, 2002Date of Patent: June 24, 2003Assignee: Engelhard CorporationInventors: Paul B. Cao, Michael Venturini
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Patent number: 6579356Abstract: One aspect of the invention relates to a brown pigment composition with excellent weathering resistance containing iron oxide, chromium oxide, and one or more alumina and/or silica components. Another aspect of the invention relates to a method of making a brown pigment involving combining iron oxide, chromium oxide, and one or more alumina and/or silica components to form a mixture and heating the mixture to provide brown pigment particles. Yet another aspect of the invention relates to a plastic composition containing a major amount of a plastic material and a minor amount of a brown pigment composition containing iron oxide, chromium oxide, and one or more alumina and/or silica components.Type: GrantFiled: July 17, 2001Date of Patent: June 17, 2003Assignee: Engelhard CorporationInventors: William Gerald Loucka, Mark Edward Gall, John Gilbert Richardson
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Patent number: 6579357Abstract: A bismuth oxychloride effect pigment exhibiting improved light stability has a discontinuous coating of hydrous iron oxide on the crystals of the bismuth oxychloride. The pigment is prepared by growing the bismuth oxychloride crystals, adding a hydrolyzable iron salt thereto and then hydrolyzing the iron salt.Type: GrantFiled: May 14, 2002Date of Patent: June 17, 2003Assignee: Engelhard CorporationInventor: Paul Cao
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Patent number: 6576051Abstract: Composite particles and a method of preparing the composite particles are provided. The composite particles contain titanium dioxide particles with adsorbed two-phase polymer particles. The two-phase polymer particles have a soft polymer phase and a hard polymer phase in which the weight ratio of the hard polymer phase to the soft polymer phase is in the range of 10:1 to 1:5. The composite particles containing the two-phase polymer particles have improved aqueous stability and provide coatings with improved scrub resistance.Type: GrantFiled: November 14, 2001Date of Patent: June 10, 2003Assignee: Rohm and Haas CompanyInventors: James Keith Bardman, Ward Thomas Brown, Kenneth Michael Donnelly, Wei Zhang, Bernhard Helmut Lieser
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Patent number: 6576052Abstract: The titanium dioxide pigment of the present invention comprises titanium dioxide particles, the coating layer containing the aluminum phosphate compound and the coating layer containing the hydrolyzate of the organosilane compound, on the surface of the particles, in which a difference in water content between 100° C. and 300° C., determined by the Karl Fischer method, is not greater than 1500 ppm, and is thus excellent in light fastness, hydrophobicity and dispersibility. In particular, the titanium dioxide pigment of the invention is extremely advantageous as a colorant for plastics, which requires light fastness (resistance to discoloration) lacing resistance and dispersibility, to a high degree.Type: GrantFiled: March 12, 2002Date of Patent: June 10, 2003Assignee: Ishihara Sangyo Kaisha, Ltd.Inventors: Hideo Takahashi, Masaki Shimojo, Toshihiko Akamatsu
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Patent number: 6572695Abstract: A bismuth oxychloride effect pigment has a carbon black particulate at about the surface of the crystals of the bismuth oxychloride. The pigment is prepared by, for instance, growing the bismuth oxychloride crystals, and adding the particulate before the hydrolysis is complete.Type: GrantFiled: August 19, 2002Date of Patent: June 3, 2003Assignee: Engelhard CorporationInventor: Paul B. Cao