Abstract: The present invention relates to a process for the preparation of iron oxide black pigment granules which are stable to handling.

Abstract: Gold pigments of high opacity and processes for their preparation and use.

Abstract: Improved alumina-coated inorganic pigments having a first coating of boehmite alumina, a second coating of amorphous alumina, and a third coating of boehmite alumina which exhibit good durability, dispersibility, and optical properties in plastic compositions are disclosed. Also disclosed is a process whereby an aqueous slurry of an alumina-containing inorganic pigment is milled to achieve a particular particle size distribution, a first coating of boehmite alumina is precipitated onto the pigment material within a first pH range, a second amount of an alumina coating agent is added to the aqueous slurry within a second pH range to obtain a second coating of amorphous alumina over the first boehmite alumina coating, and then the pH of the slurry is adjusted to a third pH range thus forming a third boehmite alumina coating over the second amorphous alumina coating.

Abstract: Luster pigments useful for coloring paints, printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations are based on multiply coated plateletlike metallic substrates comprisingA) a first, colorless or selectively absorbing layer of metal oxide,B) a second, nonselectively absorbing layer of carbon, metal and/or metal oxide, andC) if desired a third, colorless or selectively absorbing layer of metal oxide.

Abstract: The present invention provides a process for the production of hydrophobic inorganic oxide products which comprises reacting the inorganic oxide particles with organohalosilanes, preferably organochlorosilanes, to produce hydrophobic organosilane coated inorganic oxides. It is preferred that the organohalosilane compounds be reacted with the inorganic oxide particles in an aqueous slurry. The inorganic oxide pigments prepared by the processes of this invention have essentially quantitative retention of the organosilanes and contain no adsorbed aldehydes on their surface. The by-products produced in the preferred embodiments of the invention are innocuous salts, which are environmentally safe and readily disposable.

Abstract: The present invention relates to a process for the colouration of organic media by granulated inorganic pigments.

Abstract: Luster pigments based on multiply coated plateletlike silicatic substrates, obtainable by further coating substrates already coated with a first layer comprising a colorless or selectively absorbing metal oxidea) initially with a second, nonselectively absorbing layer consisting essentially of carbon, a metal or a metal oxide, andb) if desired subsequently with a third layer comprising colorless or selectively absorbing metal oxide, wherefor the carbon layer (step a) is applied by thermal decomposition of oxygen-containing hydrocarbons that for every two carbon atoms contain at least one oxygen atom, the metal layer (step a) is applied by gas phase decomposition of volatile compounds of these metals in an inert gas, and the metal oxide layer (step a and/or b) is applied by gas phase decomposition of volatile compounds of these metals in the presence of oxygen, water vapor or mixtures thereof to the substrates coated in case a) with a first metal oxide layer and in case b) additionally with a nonselectively ab

Abstract: Luster pigments based on multiply coated plateletlike metallic substrates comprisingA) a first layer consisting essentially of silicon oxide, aluminum oxide and/or aluminum oxide hydrate,B) a second layer consisting essentially of metal and/or nonselectively absorbing metal oxide, andC) if desired, a third layer consisting essentially of colorless or selectively absorbing metal oxide.

Abstract: An improved dye composition for use in coating tablets and the like is constituted by a stable, aqueous suspension containing a water-soluble, nontoxic dye, an opacifying agent which may be titanium dioxide or iron oxide an immobilizing agent for immobilizing the dye and preventing it from migrating when applied to a tablet or the like, the immobilizing agent being constituted by a nontoxic metal salt present in an amount of from approximately 0.1 to 10 equivalents of metal per mole of dye, and water. The suspension may also contain a film-forming, water-soluble or water-dispersible edible polymer and a plasticizer. These compositions are used in lieu of lake compositions to produce tablets and the like with uniform, non-mottled coatings.

Abstract: A process for preparing an iron-manganese colorant, from an aqueous media containing metal ions, having an effective amount of iron and manganese present to impart color to building materials is disclosed.

Abstract: There are provided magnetite particles characterized in that they have surfaces each covered with a thin film or iron-zinc oxides or further covered thereon with a thin film of iron-silicon oxides and have a saturation magnetization of at least 79 emu/g, a degree of blackness (L) of at most 19.5 as measured with a differential colorimeter, and an absorption of at least 30 ml/100 g as measured according to JIS K 5101. There is also provided a process for preparing magnetite particles as described above.

Abstract: A red pigment comprising: an iron oxide plate type particle, an aluminum compound layer which contains at least aluminum oxide and which is formed on the iron oxide particle, and the optical thickness of the aluminum compound layer being 150-500 nm. The red pigment according to the present invention has excellent color tone with high chroma from the orange to the blue red and moreover, and excellent stability.

Abstract: Luster pigments comprising coated, plateletlike, silicatic substrates wherein the coating comprises a layer consisting essentially of carbon and aluminum oxide, chromium oxide, cerium oxide, zirconium oxide, antimony oxide or mixtures thereof, are obtainable by applying carbon-containing compounds of the metals aluminum, chromium, cerium, zirconium, antimony or mixtures thereof with or without further carbon-containing compounds of the molecular formula (CH.sub.2 O).sub.n, where n is from 1 to 6 for one monomeric unit, to the substrate particles and then thermally decomposing the carbon-containing compounds on the surface of the substrate particles under oxygen-excluding conditions.

Abstract: The object of the present invention is to provide a lustrous pigment free from the defects of conventional platelike or flaky iron oxide pigments that a mechanical strength is poor, adjustable colors are restricted and that a pigment lustrous is weak even if colors can adjusted variously and a method of producing the same. The present invention relates to a flaky iron oxide lustrous pigment having a hematite structure characterized by containing at least one of the elements selected from Zn, Sb and Sn and Al in solid solution and its platelike crystal having an average thickness of 0.8 .mu.m or more, preferably the content of at least one of the elements selected from Zn, Sb and Sn being in the range of 0.05 to 0.5 weight % as oxides and the content of Al being in the range of 0.5 to 3 weight % as Al.sub.2 O.sub.3.

Abstract: Cobalt coated, needle shaped berthollide iron oxide pigments are disclosed which have a core of the composition (Fe.sub.x.sup.2+, Fe.sub.2.sup.3+)O.sub.3+x wherein 0.3<x<0.75, optionally also including an intermediate coating of Zn-containing benhollide between the core and the cobalt coating. The pigments are prepared by first coating the core with berthollide and a soluble zinc compound, followed by coating with a cobalt compound.

Abstract: The present invention relates to surface-modified pigments based on platelet-like substrates which, for improving the settling and redispersion behavior, have been recoated with a mixture comprising two metal oxides selected from the group consisting of silica, alumina and zirconium dioxide.

Abstract: A process for preparing transparent yellow iron oxide pigments by the precipitation of iron (II) hydroxide by adding an inorganic base to an iron (II) salt solution and subsequent oxidation to FeOOH.

Abstract: A titanium dioxide- or iron oxide-coated mica pearlescent pigment having a coating which contains a combination of hydrated cerium and aluminum oxides has enhanced weatherstability.

Abstract: This invention relates to modifying the surface of particles for improved dispersion characteristics in aqueous, solvent, resinous, polymeric, cementitious or the like application systems. In particular, this invention relates to a pigment or filler particle whose surface is coated with at least one electric charge modifying agent and at least one dispersion promoting agent, which has improved dispersibility, coloring, handling, and other processing properties in application systems. The electric charge modifying agent may be selected from the group of Mg, Ca, Ba, Sr, Ti, V, Zr, Cr, Mn, Fe, Co, Ni, Cu, Zn, and Al. The dispersion promoting agent may be selected from the group of stearates, acetates, alkylphenols, cellulosics, waxes, lignins, polyacrylics, polyepoxies, polyurethanes, polyethylenes, polystyrenes and polypropylenes, and polymers having functional groups of alcohols, glycols, aldehydes, amides and carboxylic acids. Iron oxide is the preferred pigment particle.

Abstract: Ultrafine particles of a composite particulate substance composed of two or more types of inorganic oxides, forming a particle structure in which two or more types of inorganic oxides are mutually mixed or an inorganic oxide of one type is contained in an inorganic oxide of another type, and having an average particle diameter of not more than 0.1 .mu.m, a process for the production of the ultrafine particles, use of the ultrafine particles as a thin film, particularly in an image display face plate and a cathode ray tube, and a process for using the ultrafine particles therefor.

Abstract: There are described luster pigments based on metal oxide-coated aluminum platelets wherein the substrate aluminum platelets have a total carbon content <0.1% by weight, and the preparation and use of these pigments.

Abstract: Luster pigments useful for coloring paints, printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations are based on multiply coated plateletlike metallic substrates comprisingA) a first, colorless or selectively absorbing layer of metal oxide,B) a second, nonselectively absorbing layer of carbon, metal and/or metal oxide, andC) if desired a third, colorless or selectively absorbing layer of metal oxide.

Abstract: The invention relates to iron oxide pigments based on silica, zirconium dioxide and/or titanium dioxide particles coated with iron oxide, the iron oxide content being more than 350% by weight, relative to the weight of the silica, zirconium dioxide and/or titanium dioxide particles.

Abstract: The application relates to pigments based on plate-like substrates which, if desired, are covered with one or more layers comprising metal oxides or metal oxide mixtures, zinc oxide being deposited on the surface of the substrates with the formation of a not entirely continuous layer.

Abstract: The invention relates to pigments based on platelet-like substrates substantially composed of nitridic material and coated with at least one dye and/or one metal oxide, and to processes for their preparation and also to their use in cosmetic preparations.

Abstract: This invention relates to colorants represented by the formulaBi.sub.2 A.sub.x-1 D.sub.x O.sub.ywherein: A is selected from the group consisting of Bi, Ba, Sr, Ca, Y, La, or a mixture of two or more thereof; D is selected from the group consisting of V, Mo, Mn, Ti, Ta, Nb, W, Sb, Fe, Cr, Sn, Ce, or a mixture of two or more thereof; x is a number that is at least 1; and y is the number of oxygens needed to fulfill the valence requirements of Bi, A and D; with the proviso that when A is Bi, D is other than a mixture consisting of V and Mo. These colorants are useful in providing colored compositions including: organic compositions such as plastics, rubbers, and the like; inorganic compositions such as ceramics, porcelain enamels, and the like; and coating compositions such as paints, printing inks, and the like; etc. The invention also provides for processes for making such colorants and for making such colored compositions. The invention also provides for such colorants in the form of particulate solids (e.g.

Abstract: Means, methods and compositions for simulating natural desert varnish. A solution containing soluble metallic acetate salts selected from the group consisting of iron (II), manganese(II) and mixtures thereof and indigenous clay when appropriate is sprayed on distressed or abused natural or artificial rock to produce a preselected patina which is compatible to the indigenous area.

Abstract: Iron oxide pigments are made stable against oxidation and discoloration by a coating process. Preferred coating compounds are maleic acid hydrazide and phthalic acid.

Abstract: A pigment comprising leaf-like substrates particles having a particle size of 0.5 to 100 .mu.m, whereby the surface of said particles is covered with a metal oxide comprising titanium oxide and zirconium oxide in a molar ratio of 10:1 to 10:15 within a range of from 20 wt. % to 60 wt. % based on the total weight of the pigment possesses good adhesion and spreadability and has an effect of preventing ultraviolet rays and infrared rays.

Abstract: Disclosed herein is an iron oxide coloring agent capable of suppressing aging of resins comprising plate-like hematite particles coated with amorphous silicon dioxide or hydrated alumina containing silicon dioxide fine particles or hydrated alumina fine particles having an average particle diameter of 50 to 1,000 .ANG..

Abstract: Colorant clusters comprising an aggregation of a plurality of grains of sol-derived material and colorant. The clusters are particularly useful as pigments in liquid compositions, e.g., paints and inks, for forming coatings that are retroreflective immediately upon drying. Also, a process for preparing such colorant clusters comprising admixing colorant in a binder sol to yield a pigment sol and then removing liquid medium from the pigment sol to yield the clusters. Also, a coating composition comprising retroreflective elements, a vehicle, and the aforementioned colorant clusters. After application of the composition to a substrate, the resultant coating is immediately retroreflective upon drying.

Abstract: A temperature-resistant black pigment which is a mixed oxide of manganese and iron with the structure of hematite and having a manganese content of 3 to 35% by weight, and with absolute color values in colorimetric testing in paint systems, expressed in CIELAB units, in the lightened form (Blend of 10 parts titaniumdioxide and 1 part of black pigment) of 60 to 70 for L*, -0.5 to 1.9 for a* and -4 to -6.5 for b* useful for coloring autoclave-cured building materials and for pigmenting heat-resistant paint systems is obtained by preparing a precursor material of manganese and iron oxides or hydroxides, which contains the phase with the structure of spinel and calcining that precursor material in an oxidizing atmosphere at 500.degree. to 1,000.degree. C.

Abstract: Boron-containing iron-oxide pigments as disclosed which are prepared by a nitrobenzene reduction process. The boron is present in the pigments in a homogeneously doped form in amounts of 0.02 to 0.13% by weight, based on iron oxide. Preparation of the pigments is also described.

Abstract: New electromagnetic interference (EMI) shielding pigments based on silver coated carrier pigments are disclosed which have a wider activity spectrum and are more economically available than previously known shielding pigments. The carrier pigments used are platelet shaped, ferro- or ferrimagnetic, Fe-containing, naturally occurring or synthetically produced laminar minerals. The Ag coating amounts to 5 to 25% by weight, based on the carrier pigment. Shielding pigments, which may be prepared by conventional chemical deposition of Ag or by sputtering, may be used for the production of EMI protective coatings and EMI protective films.

Abstract: Iron oxides in the form of platelets are produced by hydrothermal treatment of aqueous suspensions containing iron(III) hydroxide or oxide hydrates in the presence of alkali metal hydroxides and of aluminum and/or silicon compounds in two stages. The normality of the alkali is from 0 2 to 2 N in the first stage and is increased by from 0.2 to 2.5 in the second stage.The two-stage process according to the invention makes it possible to produce hematite pigments which are in the form of platelets, have increased luster, larger particle diameter, improved dispersibility and color hues which can be adjusted as desired.

Abstract: The present invention provides a black matrix composition that improves the contrast and the color purity at the same time. The black matrix composition comprising colloidal graphite as a major component, and ferric oxide (Fe.sub.2 O.sub.3), cobalt aluminate(CoOxAl.sub.2 O.sub.3), or mixture thereof, at a certain ratio as a pigment. The iron and surfactant are added as a cohesive. The above mixed pigment absorbs the red and blue light so as to improve the contrast and the color purity. The iron partial having magnetism can strengthen the cohesion so as to form the preferable deposited thickness of the black matrix composition.

Abstract: Disclosed herein are black pigment particles comprising polycrystalline particles having a mixed composition of Fe.sub.2 TiO.sub.5 and Fe.sub.2 O.sub.3 --FeTiO.sub.3 solid solution.

Abstract: Colored building materials are produced by incorporating into the building materials inorganic pigments in the form of granulates which are free-flowing and not dust forming wherein the pigments are produced from spray dried granulates by after-granulating.

Abstract: Coated spinel color pigments with a core of a colored spinel, in particular CoAl.sub.2 O.sub.4, and a coating glassy layer of a silicate are described. The coating layer is essentially silicon dioxide and one or more oxides of the group of alkali metals, alkaline earth metals, and/or earth metals show a high resistance to bleeding in the presence of glass fluxes, as compared to uncoated spinels. The pigments are produced by sintering, for 0.5 to 5 hours, a powder mixture of the spinel, silicon dioxide, and at least one member chosen from the group of alkali metal halides, alkaline earth metal halides, earth metal halides and mixtures thereof as mineralizer at 900.degree. to 1,300.degree. C. The coated spinel color pigments are suitable for the production of ceramic decorations with improved contour sharpness.

Abstract: Ultrafine particles of a composite particulate substance composed of two or more types of inorganic oxides, forming a particle structure in which two or more types of inorganic oxides are mutually mixed or an inorganic oxide of one type is contained in an organic oxide of another type, and having an average particle diameter of not more than 0.1 .mu.m, a process for the production of the ultrafine particles, use of the ultrafine particles as a thin film, particularly in an image display face plate and a cathode ray tube, and a process for using the ultrafine particles therefor.

Abstract: A new heat sink composition having relatively high volumetric heat capacity and relatively high density have been prepared. The compositions comprise a set of formulas including: a) 50-95% oxide of iron and 50-5% of a mixture of clay, an organic binder or an inorganic binder, where said mixture can contain any portion of clay, organic binder or inorganic binder in any proportions provided the mixture adheres to the 50-5% compositional range; b) 15-95% oxide of iron and 85-5% of clay; c) 15-85% oxide of iron, 10-2% of a transition metal oxide other than iron and 75-13% inorganic binder; and d) 50-80% oxide of iron, 15-5% of talc and 35-15% clay. The compositions show good dried and fired properties and can even be loaded and fired in-situ because they possess good dried crush strength.

Abstract: Building materials such as concrete can be colored by a black pigment which consists essentially of manganese ferrite of the composition Mn.sub.1+x Fe.sub.2-x O.sub.4 with a spinel structure wherein x has a numerical value from -0.1 to 0.1 and the pigment is prepared by a process whereina) soluble manganese (II) salts and soluble iron (II) salts are precipitated from a solution of metal salts by reaction with alkaline precipitating agents in an approximately stoichiometric ratio,b) the precipitate from a) is reacted with an oxidizing agent to form a pigment, andc) the pigment is filtered, washed, dried and ground.

Abstract: A black manganese/iron oxide pigment having a spinel structure and having the composition Mn.sub.x Fe.sub.3-x O.sub.4 wherein x has a value from 0.1 to 0.9, is prepared by the steps:a) oxidizing iron(II) salts or mixtures of iron(II) salts and manganese(II) salts, in solution or after reaction with alkaline precipitants, with manganese dioxide or other compounds containing manganese in high valency,b) additionally oxidizing the salts of (a) to establish an Fe(III) content therein with another oxidizing agent, andc) filtering, washing, drying and grinding the pigment;and the pigment is useful for pigmenting building materials to a black color.

Abstract: A black manganese/iron oxide pigment having a spinel structure and having the composition Mn.sub.x Fe.sub.3-x O.sub.4 wherein x has a value from 0.1 to 0.9, is prepared by the steps:a) oxidizing iron(II) salts or mixtures of iron(II) salts and manganese(II) salts, in solution or after reaction with alkaline precipitants, with manganese dioxide or other compounds containing manganese in high valency,b) additionally oxidizing the salts of (a) to establish an Fe(III) content therein with another oxidizing agent, andc) filtering, washing, drying and grinding the pigment;and the pigment is useful for pigmenting building materials to a black color.

Abstract: Disclosed herein is a coating composition comprising plate-like iron oxide particles having an average particle diameter of 4 to 25 .mu.m, a lamellar thickness of 0.16 to 5 .mu.m and a plate ratio (average particle diameter:lamellar thickness) of 5:1 to 25:1, at least one pigment selected from the group consisting of a coloring pigment,a mica pigment and a metal powder pigment, a film-forming polymer, and an organic solvent.

Abstract: Disclosed herein are plate-like hematite particles having an average particle diameter of 0.5 to 5.0 .mu.m, a lamellar thickness of 50 to 500.ANG. and a plate ratio (the ratio of the average particle diameter to the lamellar thickness) of 50:1 to 500:1, an iron oxide pigment showing a golden color and comprising the plate-like hematite particles, and a process for producing the plate-like hematite particles.

Abstract: Magnetic iron oxide pigments useful in manufacturing magnetic recording media are prepared by a method which comprises coating a magnetic iron oxide core particle material having the composition FeO, wherein x is from 1.33 to 1.5, in a first step with a preliminary coating of a cobalt-containing bertholloid material or a material having the composition Co.sub.x Fe.sup.II.sub.l-x Fe.sup.III.sub.2 O.sub.4 wherein x is greater than zero but less than or equal to 1 and then in a second step the preliminary coated particle is coated with a cobalt compound.

Abstract: Disclosed herein is a coating composition comprising plate-like iron oxide particles having an average particle diameter of 0.5 to 5.0 .mu.m, a lamellar thickness of 50 to 500.ANG. and a plate ratio (the ratio of the average particle diameter to the lamellar thickness) of 50:1 to 500:1, at least one pigment selected from the group consisting of a coloring pigment, a mica pigment and a metal powder pigment, a film-forming polymer, and an organic solvent.

Abstract: Colored pigments having an improved stability in decorative colors, engobes, glazes, and enamels, based on platelet-type substrates coated with metal oxides, in which the coating is free from alkaline earth metal oxides and contains a colored metal oxide or metal hydroxide and at least 10% by weight of aluminum oxide, are outstandingly suitable for pigmenting glazes and enamels.

Abstract: A decorative orange paint is obtained by using 15 to 30% by weight of an orange pigment together with 70 to 85% by weight of a glass frit. The orange pigment comprises 10 to 13% by weight of alkali metal oxide, 10 to 14% by weight of ferric oxdide, 30 to 35% by weight of aluminum oxide, and 40 to 45% by weight of silica. the glass frit comprises 35 to 60% by weight of silica, 15 to 35% by weight of boron oxide, 3 to 8% by weight of zirconium oxide, 2 to 8% by weight of aluminum oxide, 10 to 18% by weight of sodium or potassium oxide or a mixture thereof, and 2 to 6% by weight of lithium oxide.