WEATHER-RESISTANT PEARLESCENT PIGMENTS BASED ON SMALL THIN GLASS PLATES, AND METHOD FOR THE PRODUCTION THEREOF

• Main Authors: SCHMIDT, ULRICH, SCHUMACHER, DIRK, KAUPP, GUENTER
• Format: Patent
• Language: English; French; German
• Published: 03.11.2010
• Subjects: ADHESIVES; CHEMICAL PAINT OR INK REMOVERS; CHEMISTRY; COATING COMPOSITIONS, e.g. PAINTS, VARNISHES ORLACQUERS; COMPOSITIONS BASED THEREON; CORRECTING FLUIDS; DYES; FILLING PASTES; INKS; METALLURGY; MISCELLANEOUS APPLICATIONS OF MATERIALS; MISCELLANEOUS COMPOSITIONS; NATURAL RESINS; ORGANIC MACROMOLECULAR COMPOUNDS; PAINTS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; POLISHES; PREPARATION OF CARBON BLACK; THEIR PREPARATION OR CHEMICAL WORKING-UP; TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS,TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES; USE OF INORGANIC OR NON-MACROMOLECULAR ORGANIC SUBSTANCES ASCOMPOUNDING INGREDIENTS; USE OF MATERIALS THEREFOR; WOODSTAINS

Weather-resistant pearlescent pigment with high diffractive metal oxides coated glass flakes with a protective layer present on the uppermost metal oxide layer, where the glass flakes exhibit an average thickness of 50-500 nm, comprises metal oxide layer comprising titanium oxide with a rutile content of 80-100 wt.%, and the protective layer comprising silicon dioxide; or metal oxide layer and the protective layer comprising a first protective layer of cerium oxide, cerium oxide hydrate and/or cerium hydroxide, and a second protective layer of silicon dioxide. Weather-resistant pearlescent pigment with high diffractive metal oxides coated glass flakes with a protective layer present on the uppermost metal oxide layer, where the glass flakes exhibit an average thickness of 50-500 nm, comprises metal oxide layer having a refractive index of greater than 1.8 comprising titanium oxide with a rutile content of 80-100 wt.%, and the protective layer (I) comprising silicon dioxide; or metal oxide layer and the protective layer comprising a first protective layer of cerium oxide, cerium oxide hydrate and/or cerium hydroxide, and a second protective layer (II) of silicon dioxide, where the silicon dioxide protective layer is coated with an organic chemical surface coating. Independent claims are included for: (1) the preparation of weather-resistant pearlescent pigment comprising suspending metal oxide coated glass flakes in a liquid phase, applying (I) on the suspended glass flakes, applying the first protective layer and (II) on the suspended glass flakes and applying an organic chemical surface coating on the uppermost protective layer of silicon dioxide; and (2) an article, provided with a coating containing the pearlescent pigment.