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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 leaching through metal oxide coatings), thereby reducing Side effects and toxicity associated with the active agent, yet effectively controlled release of said active agent to the treatment site

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 relates generally to methods for preparing particles comprising a metal oxide coating and to compositions comprising particles having a metal oxide coating. Background technique [0002] Various methods have been used to utilize metal oxides as encapsulation materials and matrices for various applications such as cosmetics, biomaterials, optical devices, lasers, fluorescence, etc. [0003] Shells composed of hybrid inorganic-organic structures with compositionally controllable bulk and surface properties are described 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, Volume 221, Issue 1, January 1, 2000, Pages 133-136" method to form a silica shell on a silver particle core. They also...

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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