Hydrothermal process for making ultrafine metal oxide powders

• US 5,973,175 A
• Filed: 02/17/1998
• Issued: 10/26/1999
• Est. Priority Date: 08/22/1997
• Status: Expired due to Term

• Current Assignee: The Chemours Company FC, LLC (The Chemours Company)
• Original Assignee: E. I. du Pont de Nemours and Company (Corteva, Inc.)
• Inventors: Bruno, Salvatore Anthony
• Primary Examiner(s): NAZARIO GONZALEZ, PORFIRIO
• Application Number:
  US09/025,103
• Time in Patent Office: 616 Days
• Field of Search: 556/56, 556/79, 556/1, 556/107, 556/131, 556/148, 556/183, 556/55, 556/410, 556/437, 534/15
• US Class Current: 556/56
• CPC Class Codes: A61K 2800/58 Metal complex; Coordination compounds
• CPC Class Codes: A61K 8/19 containing inorganic ingredients
• CPC Class Codes: A61K 8/25 Silicon; Compounds thereof
• CPC Class Codes: A61K 8/26 Aluminium; Compounds thereof
• CPC Class Codes: A61K 8/27 Zinc; Compounds thereof
• CPC Class Codes: A61K 8/28 Zirconium; Compounds thereof
• CPC Class Codes: A61K 8/29 Titanium; Compounds thereof
• CPC Class Codes: A61K 8/58 containing atoms other than carbon, hydrogen, halogen, oxygen, nitrogen, sulfur or phosphorus
• CPC Class Codes: A61K 8/585 Organosilicon compounds
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: C01G 23/047 Titanium dioxide
• CPC Class Codes: C01P 2002/60 Compounds characterised by their crystallite size
• CPC Class Codes: C01P 2002/72 by d-values or two theta-values, e.g. as X-ray diagram
• CPC Class Codes: C01P 2002/84 by UV- or VIS- data
• CPC Class Codes: C01P 2004/04 obtained by TEM, STEM, STM or AFM
• CPC Class Codes: C01P 2004/62 Submicrometer sized, i.e. from 0.1-1 micrometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C01P 2006/60 Optical properties, e.g. expressed in CIELAB-values

Abstract

An ultrafine titanium dioxide powder is disclosed that can be produced by hydrothermal treating an amino titanium oxalate composition. Ultrafine titanium dioxide powders are useful in cosmetic and other applications for controlling exposure to ultraviolet (UV) light.

Claims

1. An amino metal oxalate having a structure comprising:

##STR2##

3. The oxalate of claim 1 further comprising at least one dopant metal selected from the group consisting of tin, titanium, aluminum, antimony, zirconium, zinc, cerium, germanium, manganese, vanadium, ruthenium, iridium, osmium, tungsten, molybdenum, niobium, cobalt, lead, silicon, indium, tantalum, yttrium, iron, copper and nickel, wherein said metal and said dopant metal are chemically distinct.

2. An amino metal oxalate wherein at least one of the metals is selected from the group of titanium, zirconium, silicon, aluminum, yttrium, europium, tin, antimony, iron or zinc.

4. The oxalate of claim 2 further comprising at least one dopant metal selected from the group consisting of tin, titanium, aluminum, antimony, zirconium, zinc, cerium, germanium, manganese, vanadium, ruthenium, iridium, osmium, tungsten, molybdenum, niobium, cobalt, lead, silicon, indium, tantalum, yttrium, iron, copper and nickel, wherein said metal and said dopant metal are chemically distinct.