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Surface-modified non-metal/metal oxides coated with silicon dioxide

A surface modification, silicon dioxide technology, applied in the treatment of dyed organosilicon compounds, nanotechnology for materials and surface science, titanium compounds, etc., can solve difficult particle addition, low surface functionality intergrowth, limitations Stability and other issues

Inactive Publication Date: 2007-02-14
EVONIK DEGUSSA GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] However, a disadvantage of this approach is that these coated metal oxide particles exhibit low surface functionality and a high degree of intergrowth of the particles, which makes it more difficult to incorporate these particles into cosmetic formulations , taking into account precipitation also limits their stability
Another disadvantage is that, besides water, organic solvents are very important substances in the preparation of these particles to form the shell

Method used

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  • Surface-modified non-metal/metal oxides coated with silicon dioxide
  • Surface-modified non-metal/metal oxides coated with silicon dioxide
  • Surface-modified non-metal/metal oxides coated with silicon dioxide

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preparation example Construction

[0160] In the process for the preparation of the oxide particles used according to the invention, a base dissolved in water is added under stirring to a dispersion comprising 1-80% by weight of a metal oxide, at least one X n Si(OR) 4-n Type compounds and water; where X n Si(OR) 4-n The / metal oxide molar ratio is between 0.1 and 25 and depends on the film thickness of the silica shell; separation of the reaction product; optional rinsing; drying.

[0161] as X n Si(OR) 4-n Type compounds are preferably used as follows: X = halogen or H, R = H or a linear or branched alkyl group with 1-8 carbon atoms, n = 0-4, and if n = 4, R is not equal to H . Particular preference is given to tetraalkoxysilanes and / or oligomers thereof.

[0162] The reaction product can be isolated by filtration or centrifugation. Rinsing can be carried out with water, organic solvents or a mixture of water and organic solvents, water is preferred in the present invention.

[0163] The granules used...

Embodiment 1

[0195] 100 g of titanium dioxide (P25 from Degussa) prepared pyrolytically by flame hydrolysis was dispersed in one liter of water. 100 ml of tetraethoxysilane was added to the solution. The mixture was stirred for 15 minutes, then 30 ml of ammonia were added. After stirring at 25°C for 2-4 hours, the product was filtered and dried.

Embodiment 2

[0197] 100 g of titanium dioxide (P25 from Degussa) prepared pyrolytically by flame hydrolysis was dispersed in one liter of water. 200 ml of tetraethoxysilane was added to the solution. The mixture was stirred for 15 minutes, then 30 ml of ammonia were added. After stirring at 25°C for 2-4 hours, the product was filtered and dried.

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Abstract

The present invention provides surface-modified silica-coated metal oxide particles having low structure and prepared by adding, with stirring, a base dissolved in water to a dispersion comprising Metal oxide, at least one XnSi(OR) 4-n type compound and water; separation; optionally rinsing with water; drying; and surface modification of the reaction product. The surface-modified silica-coated metal oxide particles can be used in sunscreen and CMP applications.

Description

technical field [0001] The present invention relates to surface-modified silica-coated non-metal / metal oxides, their preparation and their use. Background technique [0002] Metal oxides, such as titanium dioxide or zinc oxide, are widely used in sunscreens. Their action is essentially based on reflecting, scattering and absorbing harmful UV radiation and depends mainly on the primary particle size of the metal oxides. [0003] Metal oxides, such as titanium dioxide or zinc oxide, exhibit photocatalytic activity. [0004] A known method of reducing photocatalytic activity is the preparation of silica-coated metal oxide particles, which can be used as a component of sunscreens. [0005] However, a disadvantage of this approach is that these coated metal oxide particles exhibit low surface functionality and a high degree of intergrowth of the particles, which makes it more difficult to incorporate these particles into cosmetic formulations , their stabi...

Claims

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Application Information

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IPC IPC(8): C09C1/36C09C3/06C09K3/14C01G9/00C01G23/00C01G25/00C01G49/00A61K8/11A61K8/25A61K8/29A61Q17/04C09C1/04C09C1/40C09C3/12
CPCC09C1/3684A61K8/25A61K8/29C01P2006/14C09C1/40C01P2004/64C01P2006/12C09C1/3661A61Q17/04C09C3/063C09C1/043A61K2800/412B82Y30/00Y10T428/2993C01P2006/19C09C3/12A61K8/11A61K8/02
Inventor 于尔根·迈尔斯特芬·哈森察尔凯·舒马赫
Owner EVONIK DEGUSSA GMBH
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