MICROSPHERES COMPRISING ALUMINA AND ZIRCONIA SUITABLE FOR RETROREFLECTIVE ARTICLES

• Main Authors: ENGEBRETSON, Joseph D, ROLF, Jacqueline C, HEINZEN, Luke E, ROSENFLANZ, Anatoly Z, LINDSAY, Craig W, FREDERICK, JR
• Format: Patent
• Language: English; French
• Published: 14.09.2023
• Subjects: ADDITIONAL WORK, SUCH AS EQUIPPING ROADS OR THE CONSTRUCTIONOF PLATFORMS, HELICOPTER LANDING STAGES, SIGNS, SNOW FENCES, ORTHE LIKE; AMMONIA; ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMICAL COMPOSITION OF GLASSES, GLAZES, OR VITREOUSENAMELS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; COMPOUNDS CONTAINING METALS NOT COVERED BY SUBCLASSESC01D OR C01F; COMPOUNDS OF THE METALS BERYLLIUM, MAGNESIUM, ALUMINIUM,CALCIUM, STRONTIUM, BARIUM, RADIUM, THORIUM, OR OF THERARE-EARTH METALS; COMPOUNDS THEREOF; CONCRETE; CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES; CYANOGEN; FIXED CONSTRUCTIONS; GLASS; INORGANIC CHEMISTRY; JOINING GLASS TO GLASS OR OTHER MATERIALS; LIME, MAGNESIA; METALLURGY; MINERAL OR SLAG WOOL; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICS; PHYSICS; REFRACTORIES; SLAG; SURFACE TREATMENT OF FIBRES OR FILAMENTS MADE FROM GLASS,MINERALS OR SLAGS; SURFACE TREATMENT OF GLASS; TREATMENT OF NATURAL STONE

Microspheres and retroreflective articles are described. In one embodiment, the microspheres comprise at least 40 wt.% alumina, at least 35 wt.% zirconia, and silica. In another embodiment, the microspheres comprise at least 80, 85, or 90 wt.% of a combination of alumina, zirconia, and silica and the microspheres have a density of at least 3. L'invention concerne des microsphères et des articles rétroréfléchissants. Dans un mode de réalisation, les microsphères comprennent au moins 40 % en poids d'alumine, au moins 35 % en poids de zircone et de la silice. Dans un autre mode de réalisation, les microsphères comprennent au moins 80, 85 ou 90 % en poids d'une combinaison d'alumine, de zircone et de silice et les microsphères ont une densité d'au moins 3.