Method for preparing particles comprising metal oxide coating and particles with metal oxide coating

A technology of oxide coating and oxide layer, applied in chemical instruments and methods, botanical equipment and methods, coatings, etc.

Inactive Publication Date: 2010-06-23
SOL GEL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

There is also a need, especially for dermatological or agricultural compositions, characterized by the ability to isolate active agents from the surrounding environment (by reducing their lea

Method used

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  • Method for preparing particles comprising metal oxide coating and particles with metal oxide coating
  • Method for preparing particles comprising metal oxide coating and particles with metal oxide coating
  • Method for preparing particles comprising metal oxide coating and particles with metal oxide coating

Examples

Experimental program
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Embodiment approach

[0064] According to a preferred embodiment of the present invention, the method includes:

[0065] (a) contacting a solid water-insoluble particulate material with a first cationic additive and an aqueous medium so as to obtain a dispersion of said particulate material positively charged on its surface;

[0066] (b) subjecting said particulate matter to a coating process comprising precipitating a metal oxide salt on the surface of said particulate material to form a metal oxide coating on said particulate material;

[0067] (b1) in an aqueous medium, contacting the coated particulate matter with a surface binding additive which is (i) a second cationic additive and / or (ii) a nonionic additive;

[0068] (b2) performing a coating process as in step (b) on the particulate matter obtained in step (b1);

[0069] (c) repeating steps (b1) and (b2) at least 3 more times; and

[0070] (d) aging the metal oxide coating.

[0071] The method preferably comprises repeating step (c) 3 t...

Embodiment

[0261] In the following examples, all % values ​​relating to solutions are by weight. All % values ​​referring to dispersions are by weight.

[0262] Unless otherwise stated, all solutions used in the following examples refer to aqueous solutions of the stated ingredients.

[0263] Example #1: Silica Coating of BPO

[0264] Step 1: Grinding: 110 g of aqueous BPO 75% (USP grade from Sigma) were suspended in 152 g of a 0.4% CTAC solution containing 0.001% silicon antifoam. The BPO was milled with a rotor rotor mixer (Kinematika polytron 6100, operating at 15,000 rpm / 25m / s). Milling was stopped when the particle size distribution (PSD) of the suspension was d(0.9)<35 μm or the temperature reached 50°C. The final suspension was cooled to room temperature.

[0265] Step 2a: Coating Option #1: The suspension was stirred at 500 RPM with a mechanical dissolver (80 mm) throughout the coating process. The pH of the ground BPO suspension was corrected to 8 with 5N NaOH solutio...

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Abstract

The invention relates to a process for coating a solid, water-insoluble particulate matter, with a metal oxide comprising: (a) contacting the solid, water-insoluble particulate matter with an ionic additive and an aqueous medium to obtain a dispersion of said particulate matter having positive charges on its surface; (b) subjecting the particulate matter to a coating procedure comprising precipitating a metal oxide salt onto the surface of the particulate matter to form a metal oxide layer thereon to thereby obtain particulate matter coated by a metal oxide coating layer; (c) repeating step (b) at least 4 more times; and (d) aging said coating layer. The invention further relates to particles comprising a particulate matter coated by a metal oxide layer, to a use of the particles for topical administration, and to a method for preventing, reducing, or eliminating pests at a locus, using the particles.

Description

technical field [0001] The present invention generally relates to methods for preparing particles comprising metal oxide coatings, and also to compositions comprising particles having metal oxide coatings. Background technique [0002] Various approaches have been used to utilize metal oxides as encapsulation materials and substrates for various applications such as cosmetics, biomaterials, optics, lasers, fluorescence, etc. [0003] Shells composed of hybrid inorganic-organic structures with compositionally controllable bulk and surface properties In Hall, Simon, R. et al., "Cocondensation of Organosilica HybridShells on Nanoparticles, Templates: A Direct Synthetic Route to Functionalized Core-Shell Colloids, Langmuir, 16 : 1454-1456, 2000" has been described. [0004] Matijevi et al reported in "Journal of Colloid and Interface Science, Vol. 221, No. 1, Jan. 1, 2000, pp. 133-136" by improving Formation of a silica shell on a silver grain core. They also reported the f...

Claims

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Application Information

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IPC IPC(8): A01N25/26A61K8/11A61K9/16A61K9/50A61Q19/00B01J13/02B01J13/22C09C3/06C09D7/00
CPCA61K8/671A61K9/501A61K8/11A01N53/00A61K9/5021B01J13/02A61Q19/00A61K9/5073A61K8/38B01J13/22A61K8/25A61K9/5026C09C3/063A01N25/26A61K2800/412Y10T428/2991A61P17/00A61P17/04A61P17/06A61P17/08A61P17/10A01N2300/00A61K8/02A61K9/00
Inventor 奥弗·托莱达诺哈伊姆·巴尔-西曼托夫尼西姆·比尔曼莱奥拉·夏皮罗拉伊德·阿布-雷兹克斯里坎斯·塞拉迪巴特拉威廉·T·索莫
Owner SOL GEL TECH
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