Abstract: Goniochromatic luster pigments based on silicon dioxide platlets, CVD coated withA) a nonselectively absorbing filmlike layer at least partially transparent to visible light, andB) if desired an outer layer which consists essentially of colorless or selectively absorbing metal oxide and/or comprises phosphate, chromate and/or vanadate,are prepared and used for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

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: Bismuth vanadate pigments of the formula (Bi.sub.4 V.sub.2 O.sub.11).sub.1-x.(BiVO.sub.4).sub.x, where 0.ltoreq.x<0.9, further comprising from 0 to 0.5% by weight of phosphorus in the form of bismuth phosphate, are characterized by a CIELAB hue angle of from 64 to 91.degree., a chroma of from 72 to 95 and a lightness.gtoreq.62 (measuring angle 45.degree., standard illuminant D65).

Abstract: A process for preparing a silane of the formula IR.sup.1.sub.n SiR.sup.2.sub.m (I)whereR.sup.1 is --O--Y, n is an integer from 1 to 3, R.sup.2 is ##STR1## m is an integer from 1 to 3 and n+m=4, and Y and Z are each, independently of one another, unsubstituted or mono- or polyhalo-substituted C.sub.1 --C.sub.20 -alkyl, C.sub.2 --C.sub.20 -alkenyl, C.sub.2 --C.sub.20 -alkynyl and --(CH.sub.2).sub.p --A, where p is an integer from 0 to 6 and A, which is unsubstituted or substituted by one or more C.sub.1 -C.sub.6 -alkyls, is a 3- to 20-membered hydrocarbon ring entails reacting a halosilicon compound of the formula IISiX.sub.4 (II)whereX is fluorine, chlorine, bromine and iodine, with compounds of the formula III and IV, or with an anhydride of the formula V and the compound of the formula IV ##STR2## where R.sup.1 and R.sup.2, and Z have the above meanings, M is a metal of main group one and two.

Abstract: Metal oxide-doped colored zinc oxides are useful as colorants and UV absorbers in cosmetics.

Abstract: Goniochromatic luster pigments based on multiply coated platelet-shaped metallic substrates comprising at least one layer packet ofA) a layer consisting essentially of silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate, andB) a nonselectively absorbing, silicon-containing layer which is at least partially transparent to visible light,and also, if desired, additionallyC) an outer layer which consists essentially of colorless or selectively absorbing metal oxide,are useful for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Abstract: Bismuth vanadate pigments IBi.sub.x Fe.sub.y E.sub.v V.sub.(1-w) P.sub.w O.sub.z Iwith the following meanings of the variables:E denotes calcium, zinc, cerium, praseodymium, and/or silicon;x is a value from 0.8 to 1.2;y is greater than 0 to 0.1 when v is greater than 0 or is greater than or equal to 0.035 to 0.1 when v is equal to 0;v is greater than or equal to 0 to 0.2;w is greater than 0 to 0.1;z denotes the number of oxygen atoms required to satisfy the valence requirements of the cations.and the preparation and use of said pigments for dyeing coating compositions, printing inks, and plastics.

Abstract: Hydrophobic silica aerogels obtainable by reacting a waterglass solution with an acid at a pH of from 7.5 to 11, substantially removing ionic constituents from the resulting silica hydrogels by washing with water or dilute aqueous solutions of inorganic bases, while the pH of the hydrogels is kept in the range from 7.5 to 11, displacing the aqueous phase contained in the hydrogel by an alcohol, and subsequent supercritical drying of the resulting alcogels.

Abstract: Goniochromatic luster pigments based on multiply coated platelet-shaped metallic substrates comprising at least one layer packet ofA) a layer consisting essentially of silicon oxide, silicon oxide hydrate, aluminum oxide and/or aluminum oxide hydrate, andB) a metallic layer which consists essentially of aluminum and is at least partially transparent to visible light,and also, if desired, additionallyC) an outer layer which consists essentially of colorless or selectively absorbing metal oxide and/or is phosphate-, chromate- and/or vanadate-containing,are useful for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Abstract: Luster pigments obtainable by treating titania-coated silicate-based platelets at from 400.degree. to 900.degree. C. with a gas mixture comprising a vaporized organic compound and ammonia are useful for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Abstract: Interference pigments based on titanium dioxide-coated silicatic platelets which have been heated in a reducing atmosphere are useful for producing forgeryproof documents and packaging.

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: 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: Preparation of bluish luster pigments by treating titania-coated silicatic platelets with a reducing gas mixture, which comprises treating titania-coated silicatic platelets whose titania coating has a geometric layer thickness of from 10 to 60 nm at from 800.degree. to 900.degree. C. with a gas mixture comprising a vaporized organic compound and ammonia, and also bluish luster pigments based on silicatic platelets comprising a reduced titania coating with a geometric layer thickness of from 10 to 60 nm and CIELAB color coordinates -2.ltoreq.a*.ltoreq.2 and b*.ltoreq.-20 (measuring angle 20.degree., standard illuminant D65).

Abstract: Luster pigments based on multiply coated plateletlike metallic substrates comprise at least one layer packet comprisingA) a colorless coating having a refractive index n.ltoreq.1.8, andB) a selectively absorbing coating having a refractive index n.gtoreq.2.0and also if desired additionallyC) an outer, colorless or selectively absorbing coating different than the layer (B) underneath.

Abstract: Luster pigments based on coated plateletlike substrates comprising nitrogen-containing metal layers and if desired additionally one or more layers consisting essentially of colorless or selectively absorbing metal oxide, are prepared and used for coloring paints, inks, including printing inks, plastics, glasses, ceramic products and decorative cosmetic preparations.

Abstract: Silicon oxide-coated solid particles are produced by decomposing silanes which contain at least one alkanoyloxy radical with water vapor and/or oxygen in the presence of the agitated solid particles.

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: Particles (I) which are suitable as carriers for electrophotography consist ofa) a magnetic core andb) a shell of alumina, chromium oxide, molybdenum oxide, tungsten oxide, silica, tin oxide or zirconium oxide or a mixture thereofand particles (II) consist ofa) a magnetic core andb) a shell of titanium oxideand are obtainable by decomposing a titanium tetraalcoholate in the gas phase by reaction with steam and/or oxygen in the presence of agitated cores, and these particles are used in electrophotographic two-component developers.