# US 5,707,438 A · Composite cuprous oxide powder > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,707,438 A - Document ID: US5707438A - Status: Granted - Kind: A - Application number: 08/604,736 - Filed: 1996-02-21 - Granted: 1998-01-13 - Earliest claimed: 1996-02-21 - Assignees: American Chemet Corporation - Inventors: John N. Carlton - Web page: https://patentgrep.com/patent/US5707438A ## CPC - C09D 5/1618: {inorganic} - C09C 1/00: Treatment of specific inorganic materials other than fibrous fillers (tenebrescent materials C09K9/00; luminescent materials C09K11/00); Preparation of carbon black - C01P 2004/61: Micrometer sized, i.e. from 1-100 micrometer - C01P 2004/84: one phase coated with the other - C01P 2006/60: Optical properties, e.g. expressed in CIELAB-values - C01P 2006/80: Compositional purity - Y10T 428/2991: Coated - Y10T 428/2993: Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.] - C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D) - C09C: TREATMENT OF INORGANIC MATERIALS, OTHER THAN FIBROUS FILLERS, TO ENHANCE THEIR PIGMENTING OR FILLING PROPERTIES (treatment of materials specially adapted to enhance their filling properties in mortars, concrete or artificial stone C04B14/00, C04B18/00, C04B20/00); PREPARATION OF CARBON BLACK {; PREPARATION OF INORGANIC MATERIALS WHICH ARE NO SINGLE CHEMICAL COMPOUNDS AND WHICH ARE MAINLY USED AS PIGMENTS OR FILLERS} - C01P: INDEXING SCHEME RELATING TO STRUCTURAL AND PHYSICAL ASPECTS OF SOLID INORGANIC COMPOUNDS - Y10T: TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION ## Abstract A composite cuprous oxide powder is provided comprising at least about 80% by weight of cuprous oxide particles and substantially the balance cupric oxide adhering to cuprous oxide particles. The composite cuprous oxide powder is produced by surface oxidizing cuprous oxide particles to form a black coating or layer thereon. The composite powder is produced by subjecting particles of cuprous oxide to surface oxidation at a temperature ranging from about 400.degree. F. to less than about 900.degree. F. for a time period sufficient to surface oxidize the particles of cuprous oxide and produce a black coating thereon of cupric oxide. The method is applicable to the production of black pigment grade cuprous oxide powder. ## Claims ### Claim 1 A composite cuprous oxide powder comprising at least about 80% by weight of cuprous oxide particles and the balance cupric oxide adhering to said cuprous oxide particles thus forming a black coating or layer thereon. ### Claim 2 (depends on 1) The cuprous oxide powder as in claim 1, wherein said powder comprises at least about 85% cuprous oxide by weight. ### Claim 3 (depends on 2) The cuprous oxide powder of claim 2, wherein the amount of cuprous oxide ranges from about 85% to about 98% by weight. ### Claim 4 (depends on 3) The cuprous oxide powder of claim 3, wherein said powder comprises about 90% to 95% cuprous oxide by weight. ### Claim 5 (depends on 1) The powder of claim 1, wherein said powder is a black pigment grade cuprous oxide powder. ### Claim 6 (depends on 5) The black pigment grade cuprous oxide powder of claim 5, wherein said black pigment grade cuprous oxide have particles with an average particle size of less than about 325 mesh, and wherein said cuprous oxide powder is comprised of about 85% to 98% by weight of cuprous oxide and the balance cupric oxide. ### Claim 7 (depends on 6) The black pigment grade cuprous oxide powder as in claim 6, wherein said cuprous oxide powder is comprised of about 90% to about 95% by weight of cuprous oxide. ### Claim 8 An anti-fouling paint for providing an anti-fouling coating on a substrate for use in marine applications comprising a black cuprous oxide pigment dispersed in a liquid paint vehicle, the amount of pigment in said vehicle ranging from about 3% to 90% by weight, said black cuprous oxide pigment comprising surface-oxidized cuprous oxide particles containing at least about 80% by weight cuprous oxide and the balance cupric oxide as an oxidized coating on said particles of cuprous oxide. ### Claim 9 (depends on 8) The anti-fouling paint as in claim 8, wherein said cuprous oxide powder contains about 85% to about 98% by weight of cuprous oxide. ### Claim 10 (depends on 9) The anti-fouling paint as in claim 9, wherein said cuprous oxide powder dispersed through said liquid paint vehicle is comprised of about 90% to about 95% cuprous oxide. ### Claim 11 (depends on 5) A coated marine structure comprising a substrate normally in contact with seawater, said substrate having a coating thereon comprising the pigment grade black cuprous oxide powder of claim 5. ### Claim 12 (depends on 11) The coated marine structure as in claim 11, wherein said black cuprous oxide pigment comprises at least about 85% of cuprous oxide by weight and the balance cupric oxide. ### Claim 13 (depends on 11) The coated marine structure as in claim 11, wherein said pigment grade cuprous oxide powder comprises about 85% to about 98% by weight of cuprous oxide. ### Claim 14 (depends on 13) The coated marine structure as in claim 13, wherein the cuprous oxide powder is comprised of about 90% to 95% by weight of cuprous oxide.