Abstract: A method of producing composite particles of titanium dioxide and a compound inactive as a photocatalyst, comprising the steps of preparing a water based slurry of pH 3 to 5 comprising titanium dioxide, preparing a water based solution comprising a compound inactive as a photocatalyst, and reacting the slurry and the water based solution together at a pH within a range from 4 to 10 is provided, together with highly active photocatalyst particles produced using such a method, and potential uses of such photocatalyst particles.

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

Abstract: The invention relates to a transparent medium comprising pearl lustre pigments having angle-selective reflection and/or transmission properties and to the use thereof, especially in transparent thermal insulation systems (TIMs).

Abstract: The invention relates to a solid pigment composition comprising a) at least one pigment, b) at least one compound selected from the group consisting of b0) a phenol-styrene-polyglycol ether or an ionically modified phenol-styrene-polyglycol ether, b1) a condensation product prepared from b1A) sulphonated aromatics b1B) aldehydes and/or ketones and b1C) optionally one or more compounds selected from the group of unsulphonated aromatics, urea and urea derivatives, and b2) phosphoric acid, phosphonic acid and derivatives thereof, and c) at least one organic thickener.

Abstract: Pigment flakes having cores preferably composed of resins, polymers, thermoplastics, and/or thermosets with colorant (pigment and/or dyes) deposited thereon, coating applications thereof, and a method for making pigment flakes which includes providing a core material, compounding the core material, processing the core material into uniform forms such as films, wires, thread with rectangular cross sections and bead strings, providing colorant material, vaporizing the colorant material, exposing a surface of core material to the vaporized colorant material to form a layer of colorant on thereon, and fracturing the resultant colorant layered core material into flakes.

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: Luster pigments based on multiply coated reflecting platelet-shaped substrates and comprising at least one layer packet comprising A) a low refractive coating which selectively absorbs visible light and B) a reflective coating which is at least partially transparent to visible light and also, if desired, C) an outer protective layer.

Abstract: Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Abstract: Pearlescent pigment having a chromium coating thereon and an iron oxide coating on the chromium coating are intensely colored, almost phosphorescently colored, and are highly reflective.

Abstract: The present invention provides new solid solutions having a corundum-hematite crystalline structure which are useful as inorganic color pigments. Solid solutions according to the present invention include a host component having a corundum-hematite crystalline structure which contains as guest components one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc. Solid solutions according to the present invention are formed by thoroughly mixing compounds, usually metal oxides or precursors thereof, which contain the host and guest components and then calcining the compounds to form the solid solutions having the corundum-hematite crystalline structure. Some of the new solid solutions according to the present invention exhibit relatively low Y CIE tri-stimulus values and relatively high near infrared reflectance.

Abstract: Surface-modified conductive pigment obtainable by partial coating of a conductive pigment with an organic modifying agent. The modifying agent is an organometallic compound of the elements silicon, tin, titanium, zirconium or aluminum. The pigment is prepared by dispersing a conductive pigment, subsequently adding the modifying agent, if appropriate as a mixture with a solvent, to the pigment dispersion, and in particular in an amount such that the powder electrical conductance of the partly coated conductive pigment is in the range between 80% of the starting value and 10−7 S, removing the solvent present, if appropriate, with further agitation and heating of the pigment to 100° C. and finally drying the partly coated pigment.

Abstract: A flake-based pigment is provided having improved specular reflectance characteristics in the visible wavelength range. The flake-based pigment has a plurality of core flake sections each formed of a central reflector layer and dielectric support layers on opposing sides of the reflector layer. The resulting core flake section is a very thin three-layered structure that exhibits a uniaxial compressive strength much greater than a corresponding uniaxial tensile strength. This structure provides the benefits of rigidity and brittle fracture during manufacturing and application processes, which ultimately provides favorable planar and specular reflectance characteristics for the pigment in the visible wavelength range. A variety of outer coating layers can be formed around the core flake sections, such as various dielectric and absorber layers having thicknesses dependent upon the desired optical characteristics of the pigment.

Abstract: A flake-based pigment is provided having improved specular reflectance characteristics in the visible wavelength range. The flake-based pigment has a plurality of core flake sections each formed of a central reflector layer and dielectric support layers on opposing sides of the reflector layer. The resulting core flake section is a very thin three-layered structure that exhibits a uniaxial compressive strength much greater than a corresponding uniaxial tensile strength. This structure provides the benefits of rigidity and brittle fracture during manufacturing and application processes, which ultimately provides favorable planar and specular reflectance characteristics for the pigment in the visible wavelength range. A variety of outer coating layers can be formed around the core flake sections, such as various dielectric and absorber layers having thicknesses dependent upon the desired optical characteristics of the pigment.

Abstract: Magnetic particles for separating biological mixtures consist of nacreous luster pigments with magnetic properties coated with a biological polymer.

Abstract: A lustrous interference pigment with a black absorption color is obtained by forming a mica coated with hydrous titanium, iron and cobalt or chromium oxides, calcining the coated mica and then coating the resulting product with hydrous titanium and/or iron oxides and calcining the resulting product.

Abstract: Tungsten nickel-antimony-rutile mixed-phase pigments in which the nickel/tungsten molar ratio is ≧4 are used to color plastics, coating materials, printing inks and ceramic glazes.

Abstract: A lustrous interference pigment with a black absorption color is obtained by forming a mica coated with hydrous titanium, iron and cobalt or chromium oxides, calcining the coated mica and then coating the resulting product with hydrous titanium and/or iron oxides and calcining the resulting product.

Abstract: Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Abstract: Composition whereby ceramic manufactured articles, obtained by moulding a conventional ceramic mixture without added TiO2., are colored from yellow to orange, said composition consisting of an aqueous solution of inorganic compounds or organic complexes of titanium and chromium combined with antimony or tungsten or mixtures thereof, in quantities corresponding to 2 to 6% by wt. Ti, 3 to 12% Sb (or 4 to 14% tungsten) and 0.2 to 2.5% chromium.

Abstract: Colored pearl luster pigment consisting of a core of platelet shaped titanium dioxide and one or more layers of other metal oxides or metal oxide hydrates obtainable by solidifying an aqueous solution of a thermally hydrolyzable titanium compound on a continuous belt, detaching the resulting layer, coating the resulting titanium dioxide platelets, with or without drying in between, with one or more other metal oxides or metal oxide hydrates, for example Fe2O3, Fe3O4, FeOOH or Cr2O3, by a wet method, separating, drying and, if desired, calcining the material obtained.

Abstract: Multilayer interference pigment consisting of plateletlike titanium dioxide as carrier material, coated with alternating layers of metal oxides of low and high refractive index, the difference in the refractive indices being at least 0.1, which is obtainable by solidification and hydrolysis of an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detachment of the resulting coat, coating of the resulting titanium dioxide platelets, with or without drying in between, by a wet method with, alternately, a metal oxide hydrate of high refractive index and a metal oxide hydrate of low refractive index by hydrolysis of the corresponding, water-soluble metal compounds, separation, drying and, if desired, calcining of the material obtained.

Abstract: The present invention relates to laser-markable plastics, in particular thermoplastic polyurethanes, which are distinguished by the fact that they contain pigments having a coating of doped tin dioxide.

Abstract: The iron oxide platelets comprise at least one layer packet comprising A) a colorless coating having a refractive index n≦1.8, and B) a colorless coating having a refractive index n≧2.0.

Abstract: The present invention provides new solid solutions having a corundum-hematite crystalline structure which are useful as inorganic color pigments. Solid solutions according to the present invention include a host component having a corundum-hematite crystalline structure which contains as guest components one or more elements from the group consisting of aluminum, antimony, bismuth, boron, chrome, cobalt, gallium, indium, iron, lanthanum, lithium, magnesium, manganese, molybdenum, neodymium, nickel, niobium, silicon, tin, titanium, vanadium, and zinc. Solid solutions according to the present invention are formed by thoroughly mixing compounds, usually metal oxides or precursors thereof, which contain the host and guest components and then calcining the compounds to form the solid solutions having the corundum-hematite crystalline structure. Some of the new solid solutions according to the present invention exhibit relatively low Y CIE tri-stimulus values and relatively high near infrared reflectance.

Abstract: The invention relates to spherical particles having a size between 5 and 10,000 nm and containing either SnO.sub.2 or SnO.sub.2 and at least one further oxide of the elements from the 1.sup.st to fifth main groups and/or the transitional metals, the oxides also being capable of containing organic groups. A particle surface is modified with organic groups and a SnO.sub.2 content of the particles lies between 0.1 and 99% by weight.

Abstract: A titanyl sulfate solution or a titanium tetrachloride solution is neutralized with an alkali to form orthotitanic acid, to which hydrochloric acid is added such as to adjust the TiO.sub.2 concentration to 80-140 g/L and the HCl concentration to 90-150 g/L and a synthesis reaction is performed at a temperature of 25-60.degree. C. to produce titanium oxide particles in which needles aggregate and/or bind together to yield fan-shaped particles.

Abstract: The invention relates, in particular, to pigments in the form of fine particles having enhanced stability with respect to ultraviolet solar radiation and particle radiation (electrons, protons), characterized in that the pigment are coated with a UV filter.Application in the production of paints for spacecrafts.

Abstract: The invention features in particular white mineral pigments in the form of fine particles having increased stability against solar ultraviolet radiation, characterised in that the pigment particles are coated with an oxidising agent. It is useful in the formulation of white paints for space vehicles.

Abstract: In one embodiment, the present invention relates to a KOH neutralized metatitanic acid mixture containing from about 30% to about 99% by weight metatitanic acid, from about 1% to about 20% by weight of a titanyl compound, and optionally from about 0% to about 55% by weight titanium dioxide, wherein the KOH neutralized metatitanic acid mixture has a pH from about 4 to about 6.5. In another embodiment, the present invention relates to a pigment composition made by combining a KOH neutralized metatitanic acid mixture and at least one guest element precursor, wherein the KOH neutralized metatitanic acid mixture contains metatitanic acid, a titanyl compound, and optionally titanium dioxide, the KOH neutralized metatitanic acid mixture having a pH from about 4 to about 6.5.

Abstract: Surface-modified, pyrogenically produced mixed oxides which contain two or more components of the series SiO.sub.2, Al.sub.2 O.sub.3, TiO.sub.2, ZrO.sub.2, Fe.sub.2 O.sub.3, Nb.sub.2 O.sub.5, V.sub.2 O.sub.5, WO.sub.3, SnO.sub.2, GeO.sub.2 and have been surface-modified with one to several compounds of the following groups:(a) organosilanes of the type (RO).sub.3 Si(C.sub.n H.sub.2n+1),(b) R'.sub.x (RO).sub.y Si(C.sub.n H.sub.2n+1),(c) X.sub.3 Si(C.sub.n H.sub.2n+1),(d) X.sub.2 (R')Si(C.sub.n H.sub.2n+1),(e) X(R').sub.2 Si(C.sub.n H.sub.2n+1),(f) (RO).sub.3 Si(CH.sub.2).sub.m --R',(g) (R").sub.x (RO).sub.y Si(CH.sub.2).sub.m --R',(h) X.sub.3 Si(CH.sub.2).sub.m --R',(i) (R)X.sub.2 Si(CH.sub.2).sub.m --R',(j) (R).sub.2 X Si(CH.sub.2).sub.m --R',(k) Silazanes of the type ##STR1## (l) Cyclic polysiloxanes, (m) Polysiloxanes or silicone oils.

Abstract: Disclosed is a system of natural colours consisting of thousands of coloured powders of mineral origin and of materials in or on which pigments have been applied and, afterwards, submitted to at least one thermal treatment and/or irradiation. These natural colours cover the totality of the visible spectrum and offer a great variety of tones, tints and reflections from white to black, including all the rainbow colours. The powders of this system are obtained by mechanical, chemical, thermal and/or physical processes and are used alone or in combination. They are particularly useful to colour materials and, more especially those used in the construction and architectural fields.

Abstract: Purple pigments according to the invention based on a stovable support material, in particular a glass frit, having a coat applied by coprecipitation of an oxide hydrate of one or more elements from the range comprising Al, Si, Sn, Pb, Ti, Nb, Ta, Sc, Y, La, Ce and Zn and a water-insoluble gold compound or colloidal gold are distinguished from prior art pigments of a similar composition by improved color stability in high temperature firing. The pigments are obtainable in the aqueous phase by coprecipitation of an oxide hydrate and a gold compound or colloidal gold in the presence of a support material and in the absence of a reducing agent. Pigments containing gold compounds assume a purple color on heat treatment or by chemical reduction. Preferred pigments containing gold compounds, which may directly be used as decorative colorants, conveniently develop their color during firing of the decoration.

Abstract: A method of decoloring a colored concrete, comprises adding to the colored concrete, a decoloring pigment comprising a titanium oxide pigment, or a titanium oxide pigment and a pigment having a complementary color relative to color of the colored concrete. Such method can decolore the color of the colored concrete residue which attaches to or remains in production facilities in order to return a color thereof to that of an ordinary plain concrete, without works or treatments for washing-out or removing the colored concrete residue which attaches to or remains in the production facilities, in which the works or treatments are required in the case where the production facilities are used for the production of an ordinary plain concrete after the colored concrete has been produced therein, and without works or treatments for purifying a waste water generated upon washing-out or removing the residue and for making the waste water harmless; and a pigment used therefor.

Abstract: Plateletlike titanium dioxide reduction pigment consisting of titanium dioxide, titanium suboxides and, if desired, a further metal oxide or titanium oxynitride, obtainable by solidifying an aqueous solution of a thermally hydrolysable titanium compound on a continuous belt, detaching the resulting coat, coating the resulting titanium dioxide platelets, with or without drying in between, with further titanium dioxide by a wet method, drying and, if desired, calcining the material, and treating the material obtained with a reducing agent in a nonoxidizing gas atmosphere.

Abstract: Improved coated inorganic pigments having a first coating of Al.sub.2 O.sub.3, SiO.sub.2, or optionally other oxide such as a source of P.sub.2 O.sub.5, or mixtures thereof, an optional coating of ZrO.sub.2, SnO.sub.2, TiO.sub.2, SiO.sub.2, CeO.sub.2 or mixtures thereof, and a final coating of Al.sub.2 O.sub.3 which exhibit good durability, dispersibility, and optical properties in plastic or paint compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an inorganic pigment is milled to achieve a particular particle size distribution, a first coating of Al.sub.2 O.sub.3, SiO.sub.2, or optionally other oxide such as a source of P.sub.2 O.sub.5, or mixtures thereof is precipitated onto the pigment material within a first pH range, an optional amount of ZrO.sub.2, SnO.sub.2, SiO.sub.2, TiO.sub.2, CeO.sub.2 or mixtures thereof is added to the aqueous slurry within a second pH range to obtain an optional coating over the first coating, and a final coating of Al.sub.2 O.sub.

Abstract: The invention provides a method for producing colorful inorganic pigments, which comprise complex oxides of various elements, which have good weather resistance and good heat resistance, and which are widely used in colorants for ceramics and in colorants for coatings and plastics. In the method, the composite oxides are sintered at a low temperature for a short period of time to give homogeneous and well colored pigments. Under the sintering conditions, the composite oxides are not sintered excessively. The grinding step in the method is simplified.

Abstract: The invention relates to granules of inorganic pigments, a process for their production using several auxiliary substances by compacting and their use in many technical fields.

Abstract: Goniochromatic luster pigments based on multiply coated, high refractive, nonmetallic, platelet-shaped substrates which are at least partially transparent to visible light, comprising at least one layer packet ofA) a colorless coating having a refractive index n.ltoreq.1.8 andB) a reflecting, selectively or nonselectively absorbing coating which is at least partially transparent to visible light,and also, if desired, additionallyC) an outer protective layer,and their use for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Abstract: Disclosed is a system of natural colors consisting of thousands of colored powders of mineral origin and of materials in or on which pigments have been applied and, afterwards, submitted to at least one thermal treatment and/or irradiation. These natural colors cover the totality of the visible spectrum and offer a great variety of tones, tints and reflections from white to black, including all the rainbow colors. The powders of this system are obtained by mechanical, chemical, thermal and/or physical processes and are used alone or in combination. They are particularly useful to color materials and, more especially those used in the construction and architectural fields.

Abstract: A method for coloring cementitious systems using compacted inorganic granules, wherein said compacted inorganic granules comprise an inorganic pigment and a dispersing agent. Particularly, a method for coloring cementitious systems using compacted inorganic granules; wherein said compacted inorganic granules are produced by a process consisting of: (a) mixing an inorganic pigment and a dispersing agent, (b) compacting the mixture, (c) milling the compacted mixture, and (d) classifying the compacted mixture into at least one oversize material stream, at least one undersize material stream and at least one product stream of compacted inorganic granules; and wherein the coloring effect of the compacted inorganic granules in the cementitious system equals or exceeds the powder standard.

Abstract: The present invention relates to nanodisperse titanium dioxide, to a process for the production thereof and to the use thereof.

Abstract: In a method of producing TiO.sub.2 pigment particles a TiO.sub.a X.sub.b (OH).sub.c -based precursor is suspended in a liquid with or without fuel additives. The suspension is then sprayed to form droplets. The droplets are transported into a flow reactor with a carrier gas. The droplets are decomposed in the flow reactor at high temperatures to form TiO.sub.2 pigment particles which are collected downstream of the flow reactor. In a preferred embodiment, a colloidal suspension of an insoluble TiO(SO.sub.4).sub.b (OH).sub.c precipitate with suitable fuel additives was spray-calcined at 900.degree. to 1200.degree. C. to produce pigment-quality TiO.sub.2. The primary particle size of the TiO.sub.2 pigment particles is between 150-250 nm and the particles are minimally aggregated.

Abstract: This invention relates to a process for the production of inorganically coated pigments and fillers and to the use thereof.

Abstract: Composite conductive powder comprises a calcined mixture of conductive powder mainly comprising indium oxide which contains at least one member selected from the group consisting of tin oxide, titanium oxide and zirconium oxide as a dopant and conductive powder mainly comprising tin oxide which contains at least one member selected from the group consisting of antimony oxide, tantalum oxide and niobium oxide as a dopant, and a conductive film is formed from the composite, conductive powder. The composite, conductive powder and the conductive film produced from the powder permit the reduction in the amounts of materials for the ITO film, in particular, indium which is an expensive material and the composite, conductive powder can simultaneously satisfy both requirements for high transparency and high conductivity even if it is used for the formation of films through the coating technique.

Abstract: Colored pigments are provided from the green-yellow to red spectrum based on oxide-nitrides with two or three different cations Q, R and S in the crystal lattice, wherein the nitrogen to oxygen atomic ratio is determinative for the color. These pigments crystallise in the pyrochlore, spinel or elpasolite structure. Pigments in the perovskite are as provided with increased color brilliance. The color of the pigments can be adjusted in a wide range of the color spectrum during their preparation within a substance class with the cations Q, R and S and while retaining the crystal structure, by increasing or lowering the atomic ratio N to O in the oxide-nitride and bringing about the required charge balancing by replacing an equivalent quantity of the cation Q with the valency q by a cation R with the valency q+1.

Abstract: The invention relates to colored luster pigments consisting of a transparent or metallic reflecting core, of a coating consisting of at least one silicon oxide of the composition SiO.sub.0.25 to SiO.sub.0.95 and of further optional coatings, to coating processes by coating metallic silicon in the presence of oxygen, if required with changing its partial pressure, as well as to the use of these luster pigments for pigmenting plastic materials, paints and printing inks, and to pigmented compositions comprising these luster pigments.

Abstract: A rutile mixed metal oxide pigment can be prepared by calcining a rutile ore with a transition metal oxide. The rutile mixed oxide pigment can be dispersed in an emulsion to produce a paint or coating or the pigment can be combined with a network former and network modifier to produce a ceramic glaze.

Abstract: Tin-containing grey pigments of high opacity, processes for their preparation and use thereof.

Abstract: There are disclosed stabilized Ti-Sn-O nanoclusters formed by complexing Ti-Sn-O nanoclusters with a salt of an alpha-hydroxy acid and also complexed nanoclusters with increased charge transfer interaction formed by annealing the complexed nanoclusters. Also disclosed are compositions for protection against ultraviolet radiation in which the nanoclusters are utilized with the usual topical carriers in an amount to give the level of sun protection factor (SPF) desired. Further disclosed is the method of making the nanoclusters involving acid hydrolyzing a titanium alkoxide and then reacting the hydrolyzed alkoxide with a tin halide.

Abstract: Prior art production of purple pigments based on colloidal gold on stovable/sinterable/fireable support material involves the reduction of a gold compound in the presence of a chemical reducing agent.Purple pigments may be produced more simply according to the invention by intimately mixing and/or grinding the support material and the gold compound in dry form or by bringing an aqueous solution or suspension of a gold compound and a support material into contact and then thermally treating the mixture at a temperature above the decomposition temperature of the gold compound and below the sintering temperature of the support material, wherein the gold compound is converted into colloidal gold.