Coating composition for forming titanium oxide film, process for forming titanium oxide film and metal substrate coated with titanium oxide film

• US 20050205165A1
• Filed: 04/19/2005
• Published: 09/22/2005
• Est. Priority Date: 10/30/2001
• Status: Abandoned Application

• Current Assignee: Kansai Paint Company Limited
• Original Assignee: Kansai Paint Company Limited
• Inventors: Isozaki, Osamu, Nagai, Akinori, Haruta, Yasuhiko, Akui, Jun
• Application Number:
  US11/108,880
• Publication Number:
  US 20050205165A1
• Time in Patent Office: Days
• US Class Current: 148/247
• CPC Class Codes: C01G 23/04 Oxides; Hydroxides
• CPC Class Codes: C01G 23/053 Producing by wet processes, e.g. hydrolysing titanium salts
• CPC Class Codes: C01P 2004/84 one phase coated with the other
• CPC Class Codes: C09C 1/3607 Titanium dioxide
• CPC Class Codes: C09D 1/00 Coating compositions, e.g. paints, varnishes or lacquers, based on inorganic substances
• CPC Class Codes: C23C 18/1216 Metal oxides C23C18/1212 takes precedence
• CPC Class Codes: C23C 18/1241 Metallic substrates
• CPC Class Codes: C23C 18/1254 Sol or sol-gel processing
• CPC Class Codes: C23C 26/00 Coating not provided for in groups C23C2/00 - C23C24/00
• CPC Class Codes: C23C 30/00 Coating with metallic material characterised only by the composition of the metallic material, i.e. not characterised by the coating process C23C26/00, C23C28/00 take precedence

Abstract

The present invention provides a coating composition for forming a titanium oxide film, comprising (A) a specific titanium-containing aqueous liquid and (B) at least one compound selected from the group consisting of organic acids and their salts. The present invention also provides a process for forming a titanium oxide film using the coating composition, and a metal substrate coated therewith.

Claims

1. A coating composition for forming a titanium oxide film;

comprising;

(A) a titanium-containing aqueous liquid obtained by mixing at least one titanium compound selected from the group consisting of titanium hydroxide and its condensates having a condensation degree of 2 to 30, with aqueous hydrogen peroxide; and

(B) at least one compound selected from the group consisting of organic phosphoric acids and their salts.

2. A coating composition according to claim 1, wherein the compound (B) is at least one compound selected from the group consisting of hydroxyl-containing organic phosphorous acids, carboxyl-containing organic phosphorous acids and salts of these acids.

3. A coating composition according to claim 1, wherein the proportion of the compound (B) is 1 to 400 parts by weight per 100 parts by weight of the solids in the titanium-containing aqueous liquid (A).

4. A coating composition according to claim 1, which is an aqueous liquid having a pH of 1 to 10.

5. A coating composition according to claim 4, which is an aqueous liquid having a pH of 1 to 9.

6. A coating composition according to claim 1, which further comprises an inorganic phosphoric acid compound.

7. A coating composition according to claim 1, which further comprises at least one halide selected from the group consisting of titanium halides, titanium halide salts, zirconium halides, zirconium halide salts, silicon halides and silicon halide salts.

8. A coating composition according to claim 1, which further comprises an aqueous organic compound selected from the group consisting of epoxy resins, phenol resins, acrylic resins, urethane resins, polyvinyl alcohol resins, polyoxyalkylene chain-containing resins, olefin-polymerizable unsaturated carboxylic acid copolymer resins, nylon resins, polyglycerin, carboxymethyl cellulose, hydroxymethyl cellulose, and hydroxyethyl cellulose.

9. A process for forming a titanium oxide film, comprising applying a coating composition according to claim 1 to a metal substrate, followed by drying.

10. A coated metal substrate comprising a metal substrate and a film of a coating composition according to claim 1 formed on a surface of the substrate.

11. A coated metal substrate according to claim 10, wherein the film has a dry weight of 0.001 to 10g/m².

12. A coated metal substrate according to claim 10, wherein the metal substrate is made of steel.

13. A coated metal substrate according to claim 10, wherein the metal substrate is made of aluminum or an aluminum alloy.