Method of Producing Rutile Titanium Dioxide Fine Particles

• US 20080305338A1
• Filed: 05/16/2006
• Published: 12/11/2008
• Est. Priority Date: 09/30/2005
• Status: Abandoned Application

• Current Assignee: Sakai Chemical Industry Company Limited
• Original Assignee: Sakai Chemical Industry Company Limited
• Inventors: Terabe, Atsuki, Mizutani, Hideto
• Application Number:
  US11/992,909
• Publication Number:
  US 20080305338A1
• Time in Patent Office: Days
• US Class Current: 428/405
• CPC Class Codes: A61K 2800/413 Nanosized, i.e. having sizes below 100 nm
• CPC Class Codes: A61K 2800/43 Pigments; Dyes
• CPC Class Codes: A61K 8/25 Silicon; Compounds thereof
• CPC Class Codes: A61K 8/29 Titanium; Compounds thereof
• CPC Class Codes: A61K 8/585 Organosilicon compounds
• CPC Class Codes: A61Q 1/02 Preparations containing skin colorants, e.g. pigments preparations in powder form A61Q1/12
• CPC Class Codes: A61Q 17/04 Topical preparations for affording protection against sunlight or other radiation; Topical sun tanning preparations
• CPC Class Codes: B82Y 30/00 Nanotechnology for materials or surface science, e.g. nanocomposites
• CPC Class Codes: B82Y 5/00 Nanobiotechnology or nanomedicine, e.g. protein engineering or drug delivery
• CPC Class Codes: C01G 23/053 Producing by wet processes, e.g. hydrolysing titanium salts
• CPC Class Codes: C01P 2004/64 Nanometer sized, i.e. from 1-100 nanometer
• CPC Class Codes: C01P 2006/12 Surface area
• CPC Class Codes: C08K 3/22 of metals
• CPC Class Codes: C08K 9/02 Ingredients treated with inorganic substances
• CPC Class Codes: C08K 9/06 with silicon-containing compounds
• CPC Class Codes: C09C 1/3661 Coating
• CPC Class Codes: C09C 1/3684 Treatment with organo-silicon compounds
• CPC Class Codes: C09C 1/3692 Combinations of treatments provided for in groups C09C1/3615 - C09C1/3684
• CPC Class Codes: C09D 7/62 modified by treatment with other compounds
• CPC Class Codes: C09D 7/67 Particle size smaller than 100 nm
• CPC Class Codes: Y10T 428/2993 : Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
• CPC Class Codes: Y10T 428/2995 : Silane, siloxane or silicone coating

Abstract

It is an object of the present invention to provide a method of producing a rutile titanium dioxide fine particle having a high ultraviolet protection property and high transparency for visible light. The present invention provides a method of producing a rutile titanium dioxide fine particle, comprising the steps of (1) treating titanium dioxide hydrate with at least one of a basic compound selected from the group consisting of hydroxides of alkali metal and hydroxides of alkaline-earth metal, and (2) treating the compound obtained by the step (1) with a carboxylic acid group-containing compound and an inorganic acid.

Claims

1. A method of producing a rutile titanium dioxide fine particle, comprising the steps of

(1) treating titanium dioxide hydrate with at least one of a basic compound selected from the group consisting of hydroxides of alkali metal and hydroxides of alkaline-earth metal, and (2) treating the compound obtained by the step (1) with a carboxylic acid group-containing compound and an inorganic acid.

2. The method of producing a rutile titanium dioxide fine particle according to claim 1,

wherein the rutile titanium dioxide fine particle has an average primary particle diameter of 5 to 15 nm.

3. A rutile titanium dioxide fine particle which is obtained by the method according to claim 1.

4. The rutile titanium dioxide fine particle according to claim 3,

further comprising a high-density silica coating layer on the surface of the rutile titanium dioxide fine particle.

5. The rutile titanium dioxide fine particle according to claim 4,

further comprising a coating layer of an organic silicon compound on the high-density silica coating layer.

6. The rutile titanium dioxide fine particle according to claim 5,

wherein at least a part of the coating layer of an organic silicon compound is constituted of a branched organic silicon compound.

7. A cosmetic composition comprising the rutile titanium dioxide fine particle according to any one of claims 3 to 6.

8. A coating composition comprising the rutile titanium dioxide fine particle according to any one of claims 3 to 6.

9. A resin composition comprising the rutile titanium dioxide fine particle according to any one of claims 3 to 6.