Titanium oxide-containing material and process for preparing the same

• US 6,376,023 B1
• Filed: 11/17/1999
• Issued: 04/23/2002
• Est. Priority Date: 05/23/1997
• Status: Expired due to Fees

• Current Assignee: Kyorasha Co., Ltd., Moritoshi Kabushikikaisha
• Original Assignee: Kyorasha Co., Ltd., Moritoshi Kabushikikaisha
• Inventors: Mori, Takefumi
• Primary Examiner(s): Jones, Deborah
• Assistant Examiner(s): MCNEIL, JENNIFER C
• Application Number:
  US09/424,030
• Time in Patent Office: 888 Days
• Field of Search: 428/432, 428/434, 428/472, 428/472.1, 428/469, 428/537.1, 428/537.7, 428/699, 428/701, 428/702, 427/189, 427/207.1, 427/437, 427/440, 427/443.1, 427/443.2, 427/523, 427/525, 427/430.1
• US Class Current: 427/430.1
• CPC Class Codes: C01G 23/0536 by hydrolysing chloride-containing salts
• CPC Class Codes: C03C 17/256 Coating containing TiO2
• CPC Class Codes: C03C 2217/212 TiO2
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C03C 2218/111 by dipping, immersion

Abstract

A titanium oxide-containing material having a surface plated with titanium oxide. It is prepared by dissolving titanium fluoride (such as titanium tetrafluoride) in an amount of 2.0% owf in water, immersing a raw material in the obtained aqueous solution to treat the material with the aqueous solution at room temperature for 30 min, and adding a 0.5:1:1 (on a weight basis) mixture of boric acid, citric add, and DL-malic add in an amount of 0.5% owf to the aqueous solution to treat the material with the aqueous solution at 50° C. for 30 min, followed by washing with water. The raw materials usable herein include synthetic fibers, metals, glass, and woods, and may be in the form of sheet, plate, fiber, rod, or the like. Introduction of a noble metal, such as gold or silver, in addition to titanium oxide, onto the surface of the material enables the acceleration of the photocatalytic action of titanium oxide.

Claims

1. A process for plating a surface of a substrate with an anatase titanium oxide film, comprising:

adding a titanium fluoride in an aqueous solvent to prepare a solution; and

bringing the solution into contact with the surface of the substrate while adding boric acid, malic acid, and citric acid to the solution.

2. The process of plating a surface of a substrate with an anatase titanium oxide film according to claim 1, wherein the titanium fluoride is titanium tetrafluoride.

3. The process of plating a surface of a substrate with an anatase titanium oxide film according to claim 1, wherein the substrate is at least one selected from the group consisting of synthetic fibers, glass, metals, resins and wood.

4. The process of plating a surface of a substrate with an anatase titanium oxide film according to claim 1, wherein a noble metal is incorporated in the titanium oxide film.

5. The process of plating a surface of a substrate with an anatase titanium oxide film according to claim 1, wherein a pH of the solution after boric acid, malic acid, and citric acid are added is in the range of 3 to 5.