Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: A metal oxide-coated mica pearlescent pigment having a coating of copper chromite thereon is provided.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.

Abstract: 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.