Titanium dioxide aqueous dispersion and method for producing same

A titanium dioxide and dispersion technology, used in cosmetic preparations, cosmetics, pharmaceutical formulations, etc., can solve the problems of reduced visible light transparency shielding, easy agglomeration, etc., and achieve excellent visible light transparency and ultraviolet shielding.

Active Publication Date: 2020-09-18
ISHIHARA SANGYO KAISHA LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Such fine titanium dioxide has the property that the primary particles are easily agglomerated, and when the primary particles are agglomerated, the above-mentioned characteristics (for example, visible light transparency and ultraviolet shielding property) are reduced

Method used

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  • Titanium dioxide aqueous dispersion and method for producing same
  • Titanium dioxide aqueous dispersion and method for producing same
  • Titanium dioxide aqueous dispersion and method for producing same

Examples

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Effect test

Embodiment 1

[0071] Spherical titanium dioxide ultrafine particles (TTO-55(C), available from Ishihara Sangyo Kaisha, Ltd.) were prepared as hydrophobic compound-coated titanium dioxide particles. Titanium dioxide particles were prepared by the above "calcination method", the crystal form was rutile, the average primary particle diameter measured by electron micrograph method was 40 nm, and the aspect ratio was 1.3.

[0072] Titanium dioxide particles are obtained by using aluminum hydroxide (Al(OH) 3 ) coating the surface of the particles; and further coating with stearic acid. Based on TiO 2 The quality of the aluminum hydroxide coating (amount used for coating treatment) is 3%, and based on TiO 2 The mass of stearic acid (the amount used for coating treatment) was 3%. The details of the production method of titanium dioxide particles are as described in Example 1 of JPH 07-247119 A.

[0073] In addition, the lead content in the titanium dioxide particles was measured by using the fo...

Embodiment 2

[0085] Except that the nonionic surfactant used in Example 1 was changed to PEG-9 polydimethylsiloxane (KF-6013: available from Shin-Etsu Chemical Co., Ltd., HLB value: 10.0), in the same manner as in the implementation The titanium dioxide aqueous dispersion of Example 2 was obtained in the same manner as in Example 1. The pH of the aqueous dispersion was 9.6.

Embodiment 3

[0087] A titanium dioxide aqueous dispersion was obtained in the same manner as in Example 1 except that the basic compound used in Example 1 was changed to a 17% ammonia solution (0.62 parts by mass). The pH of the aqueous dispersion was 9.4.

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Abstract

Provided are a titanium dioxide aqueous dispersion having high dispersibility and little aggregation or coarse particles, and a method for producing the same. The titanium dioxide aqueous dispersion contains titanium dioxide particles having a hydrophobic compound such as a higher fatty acid or a salt thereof on the surface, an aqueous dispersion medium, a nonionic surfactant having an HLB value of 10 or higher, and a basic compound such as an alkanolamine, and the pH is in the 8.5-13 range. The method for producing a titanium dioxide aqueous dispersion has a step for mixing the titanium dioxide particles having a hydrophobic compound on the surface, the aqueous dispersion medium, the nonionic surfactant having an HLB value of 10 or higher, and the basic compound to bring the pH of the aqueous dispersion into the 8.5-13 range.

Description

technical field [0001] The present invention relates to an aqueous dispersion of titanium dioxide particles and a process for its preparation. Background technique [0002] Titanium dioxide particles having a particle diameter of about 3 to 200 nm have excellent visible light transparency and ultraviolet shielding properties and high safety, and are thus used in cosmetics, paints, inks, chemical fibers, polishing compositions, and the like. [0003] Such fine titanium dioxide has the property that the primary particles are easily aggregated, and when the primary particles are aggregated, the above-mentioned properties (for example, visible light transparency and ultraviolet shielding property) are lowered. Therefore, a material (ie, a dispersion) in which titanium dioxide particles are dispersed in a dispersion medium is prepared in advance, and this dispersion is used to apply the titanium dioxide particles to various uses. [0004] For example, Patent Document 1 describes...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09D17/00C09C1/36C09D5/02C09D7/62C09D7/63C09D201/00
CPCC09D201/00C09D7/62C09C1/3669C09C1/3661C09C1/3692C01P2004/32C01P2004/54C01P2004/64C01P2002/84C01P2006/80C09G1/02C08K2003/2241C08K2003/2296C08K2003/2213C08K2003/2265C08K2003/2227C08K3/36C09C1/3607C09D5/028C09D17/00A61K8/29A61Q19/00C09D7/45C09D7/63C01P2004/84C09D5/02C09D17/001C09D17/008
Inventor 友成雅则永森智龟田优人
Owner ISHIHARA SANGYO KAISHA LTD
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