Method for producing ceramic dispersion composition

• US 6,884,753 B2
• Filed: 05/16/2003
• Issued: 04/26/2005
• Est. Priority Date: 05/27/2002
• Status: Expired due to Fees

• Current Assignee: Sumitomo Chemical Company Limited
• Original Assignee: Sumitomo Chemical Company Limited
• Inventors: Koike, Hironobu, Sakatani, Yoshiaki, Okusako, Kensen
• Primary Examiner(s): Bell, Mark L.
• Assistant Examiner(s): Hailey, Patricia L.
• Application Number:
  US10/438,813
• Publication Number:
  US 20030220194A1
• Time in Patent Office: 711 Days
• Field of Search: 501/1, 501/134, 501/928, 516/79, 516/88, 516/90, 502/150, 502/172, 502/350, 502/506, 423/610
• US Class Current: 502/350
• CPC Class Codes: B01J 21/063 Titanium; Oxides or hydroxides thereof
• CPC Class Codes: B01J 35/39 Photocatalytic properties
• CPC Class Codes: B01J 37/0215 Coating
• CPC Class Codes: B01J 37/03 Precipitation; Co-precipitation
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: C01P 2002/70 defined by measured X-ray, neutron or electron diffraction data
• CPC Class Codes: C01P 2002/84 by UV- or VIS- data
• CPC Class Codes: C01P 2004/51 Particles with a specific particle size distribution
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/80 Compositional purity
• CPC Class Codes: C03C 17/25 by deposition from the liquid phase
• CPC Class Codes: C03C 17/256 Coating containing TiO2
• CPC Class Codes: C03C 2217/71 Photocatalytic coatings
• CPC Class Codes: C09C 1/3669 Treatment with low-molecular organic compounds
• CPC Class Codes: C09C 1/3692 Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
• CPC Class Codes: Y10S 502/506 Method of making inorganic composition utilizing organic compound, except formic, acetic, or oxalic acid or salt thereof

Abstract

The present invention provides a method for producing a ceramic dispersion composition, the method comprising the step of heating a mixture of a ceramic powder having a photocatalytic activity, a dispersant and a solvent at a temperature of about 70° C. or higher without substantially letting the solvent out of the reaction system. The ceramic dispersion composition can be used for providing a film showing a high hydrophilicity by light irradiation.

Claims

1. A method for producing a ceramic dispersion composition, the method comprising the step of heating a mixture of a ceramic powder having a photocatalytic activity, a dispersant and a solvent at a temperature of about 70°

C. or higher, wherein the heating is conducted without substantial evaporation of the solvent.

2. A method according to claim 1, wherein the ceramic powder is a titanium oxide.

3. A method according to claim 1, wherein the ceramic powder shows an activity by irradiation of light having a wavelength of from about 430 nm to about 830 nm.

4. A method according to claim 1, wherein the dispersant is a compound selected from the group consisting of an inorganic acid, an inorganic base, an organic acid, an organic base and an organic acid salt.

5. A method according to claim 1, wherein the mixture is obtained using a medium stirring-type dispersing apparatus.