Titanium oxide dispersion liquid, titanium oxide coating liquid, and photocatalyst coating film

Patent metadata

Field	Value
Publication number	US-9440221-B2
Application number	US-201414769211-A
Country	US
Kind code	B2
Filing date	Mar 6, 2014
Priority date	Mar 15, 2013
Publication date	Sep 13, 2016
Grant date	Sep 13, 2016

Abstract

Provided is a titanium oxide dispersion liquid that has dispersibility and dispersion stability both at superior levels and, when applied and dried, can form a photocatalyst coating film capable of rapidly developing excellent photocatalytic activity. The titanium oxide dispersion liquid according to the present invention includes titanium oxide particles (A), a dispersing agent (B), and a solvent (C). The titanium oxide particles (A) support a transition metal compound. The dispersing agent (B) includes a poly(acrylic acid) or a salt thereof. The poly(acrylic acid) or a salt thereof in the dispersing agent (B) preferably includes a poly(acrylic acid) alkali metal salt. The poly(acrylic acid) or a salt thereof in the dispersing agent (B) preferably has a weight-average molecular weight of from 1000 to 100000.

First claim

The invention claimed is:

1. A titanium oxide dispersion liquid comprising:
titanium oxide particles (A) supporting an iron compound,
wherein the titanium oxide particles are selected from the group consisting of: rutile titanium dioxide having (110) and (111) planes, supporting the iron compound on the (111) plane; rutile titanium dioxide having (110), (111), and (001) planes, supporting the iron compound on the (111) and (001) planes; and mixtures thereof, and
wherein the supported amount of the iron compound is 50 ppm or more on a weight basis relative to the titanium oxide particles;
a dispersing agent (B) comprising a poly(acrylic acid) or a salt of the poly(acrylic acid); and
a solvent (C).

2. The titanium oxide dispersion liquid according to claim 1 , wherein the dispersing agent (B) comprises a poly(acrylic acid) alkali metal salt as the poly(acrylic acid) or a salt thereof.

3. The titanium oxide dispersion liquid according to one of claims 1 and 2 , wherein the poly(acrylic acid) or a salt thereof in the dispersing agent (B) has a weight-average molecular weight of from 1000 to 100000.

4. The titanium oxide dispersion liquid according to claim 1 , wherein the titanium oxide particles (A) supporting an iron compound comprise titanium oxide particles supporting iron compound on a plane acting as an oxidation site.

5. A titanium oxide coating liquid comprising:
the titanium oxide dispersion liquid according to claim 1 ; and
at least one binder component (D) selected from the group consisting of: titanium peroxide; silicon compounds; and fluorocarbon resins.

6. The titanium oxide coating liquid according to claim 5 , wherein the binder component (D) comprises titanium peroxide.

7. A photocatalyst coating film formed using the titanium oxide coating liquid according to one of claims 5 and 6 .

8. A photocatalyst-coated article comprising:
a substrate; and
the photocatalyst coating film according to claim 7 disposed on or over a surface of the substrate.

Assignees

• Daicel Corp

Inventors

• Kojima Ryouta
• Fukui Naoyuki
• Watanabe Hitoshi

Classifications

• B01D2257/306

  Organic sulfur compounds, e.g. mercaptans · CPC title

• B01D2259/4508

  for cleaning air in buildings · CPC title

• B01D2259/4591

  Construction elements containing cleaning material, e.g. catalysts · CPC title

• B01J37/0203

  the impregnation liquid containing organic compounds · CPC title

• B01D53/8668

  Removing organic compounds not provided for in B01D53/8603 - B01D53/8665 · CPC title