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Cosmetic formulations comprising zno nanoparticles

A cosmetic and particle technology, applied in the field of nanoparticulate zinc oxide and charged organic components such as acrylate-based polymers, zinc oxide and titanium dioxide nanoparticles, can solve the problem of not preventing ion migration or affecting the performance of interface materials issues of ultimate control

Inactive Publication Date: 2007-05-16
BASF AG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These coatings are thin surface treatments that impart a degree of compatibility to formulations and products and are free of particle aggregation as far as best available techniques are concerned, but they do not prevent ion migration from reactive particles or affect ultimate control over interface material properties

Method used

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  • Cosmetic formulations comprising zno nanoparticles
  • Cosmetic formulations comprising zno nanoparticles
  • Cosmetic formulations comprising zno nanoparticles

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] Example 1 General Batch Process for Surface Treatment of Zinc Oxide and / or Titanium Dioxide Particles

[0095] The method involves introducing zinc oxide and / or titanium dioxide particles comprising a plurality of nanoparticles into a surface treatment vessel capable of mixing and heating its contents under controlled circumstances. Examples of suitable surface preparation vessels include Buchi Rotovap (small, available from Brinkmann Instruments), V-blender (industrial scale, available from Patterson-Kelley), ribbon mixer (industrial scale, available from Jaygo), rotary oven (industrial Scale, available from Thermal Processing Solutions), and fluidized bed (industrial scale, available from Littleford Day).

[0096]a) The particles are introduced into the surface treatment vessel by methods known to those skilled in the art. Oxygen is removed from the vessel, typically by vacuum followed by flushing with an inert gas, followed by incorporation of the bulk nanoparticles...

Embodiment 2

[0104] The batch method of embodiment 2 surface treatment zinc oxide

[0105] The following is a description of a method for preparing surface-treated zinc oxide particles. Surface-treated zinc oxide is an active physical sunscreen ingredient for cosmetic formulations.

[0106] The product was prepared by the batch process detailed in Example 1.

[0107] a) Set the surface area to 14m 2 8 kg of zinc oxide nanoparticles / g were weighed into plastic bags and manually loaded into clean 2-ft 3 V-shaped mixer. Oxygen was removed by evacuating the V-blender to full vacuum level, followed by devacuum of the V-blender with nitrogen. Repeat the vacuum and devacuum cycle twice.

[0108] b) The V-blender was filled with inert gas and rotated at 5 RPM, and the V-blender was continuously flushed with nitrogen to condition the particles by removing adsorbed species.

[0109] c) Uniformly mix diphenyldimethoxysilane (168g) and octyltriethoxysilane (42g) monomers using a paddle mixer to ...

Embodiment 3

[0114] Embodiment 3 specific surface treatment embodiment

[0115] 1) Physical sunscreen ingredients-Si(20,80) / octyltriethoxysilane, diphenyldimethoxysilane; applied to ZnO(23m 2 / g) of 4.3% by weight of the surface treatment layer precursor mixture.

[0116] 2) Physical sunscreen ingredients-Si(20,80) / octyltriethoxysilane, diphenyldimethoxysilane; applied to TiO 2 (50m 2 / g) of about 9.4% by weight of the surface treatment layer precursor mixture.

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Abstract

The present invention relates to the formation of surface treated zinc oxide and titania particles, and in particular zinc oxide and titania nanoparticle s, with a siloxane star-graft copolymer coating, comprising a looped and / or linear polymeric structure on a star-graft copolymer coating, on a particle surface to control the interfacial surface interactions between the particle and the oil phase of the cosmetic skin formulation.

Description

[0001] Cross References to Related Patents [0002] Particle surfaces, especially nanoparticle surfaces, can be surface treated with star graft copolymers to form uniform coatings according to the methods disclosed in US Pat. Nos. 5,993,967 and 6,033,781, which are incorporated herein by reference. field of invention [0003] Modern skin care formulations must meet high standards of efficacy, skin compatibility and aesthetics. The performance of a cosmetic product is generally considered to be related to the entire formulation. Thus, an optimal herbal formulation incorporating active ingredients is a necessary prerequisite for market success. The purpose of topical formulations can be divided into two main areas: modulating or assisting the protective function of the skin and serving as a delivery system for active ingredients. This patent is dedicated to an interesting concept of herbal formulations for the development of modern skin care products which combine, inter alia,...

Claims

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Application Information

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IPC IPC(8): A61K8/02B32B18/00A61Q19/04
Inventor V·安德烈R·W·小布罗茨曼
Owner BASF AG
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