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Composite polymer particle and method for preparing same

A composite polymer and particle technology, which is applied in pharmaceutical formulations, cosmetic preparations, toiletry preparations, etc., can solve the problems of inability to obtain defense effects, usability and transparency, etc.

Inactive Publication Date: 2004-04-14
KAO CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, resin powder containing these metal oxides alone, or only in combination with ultrafine titanium oxide particles, cannot obtain cosmetics that have both the expected sufficient UVA (ultraviolet A) protection effect, usability, and transparency.

Method used

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  • Composite polymer particle and method for preparing same
  • Composite polymer particle and method for preparing same
  • Composite polymer particle and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102] Using a glass bead mill, 60 g of silicon-treated zinc oxide (MZ-507S) manufactured by Teika was stirred for 3 hours in 45 g of lauryl methacrylate (SP value 8.7) and 45 g of ethylene glycol dimethacrylate (manufactured by Otsuka Electronics Co., Ltd. The average particle diameter of zinc oxide measured by ELS-8000 is 0.3 μm). Thereafter, 3 g of lauroyl peroxide were added. 20 g of sodium lauryl sulfate was dissolved in 1500 g of ion-exchanged water, added to the above-mentioned zinc oxide slurry, and dispersed using a Mielder (the average particle diameter of the emulsion measured with LA-910 manufactured by Horiba Seisakusho was 1.6 μm). Next, put the dispersion into a 2000mL separable beaker, replace it with nitrogen, and heat up to 70°C while stirring at 200r / min, keep it at 70°C for 10 hours, then raise the temperature to 80°C, and heat up to 80°C under nitrogen at 80°C. Polymerization was carried out under atmosphere for 10 hours. After the polymerization, the so...

Embodiment 2

[0105] Using a glass bead mill, 90 g of Teika silicon-treated zinc oxide (MZ-507S) was mixed with 45 g of octadecyl methacrylate (SP value 8.7), 45 g of 1,6-hexanediol dimethacrylate, and 30 g of heptane. Stirring was carried out for 3 hours (the average particle diameter of zinc oxide measured with ELS-8000 manufactured by Otsuka Electronics Co., Ltd. was 0.4 μm). Thereafter, 3 g of lauroyl peroxide were added. Dissolve 15 g of sodium cocoyl methyl taurate in 1500 g of ion-exchanged water, add it to the above-mentioned zinc oxide slurry, and disperse it using a homogenizer (the average particle diameter of the emulsion measured with LA-910 manufactured by Horiba Manufacturing Co., Ltd. is 1.6 μm) ). Next, put the dispersion into a 2000mL separable beaker, replace it with nitrogen, and heat up to 70°C while stirring at 200r / min, keep it at 70°C for 10 hours, then raise the temperature to 80°C, and heat up to 80°C under nitrogen at 80°C. Polymerization was carried out under a...

Embodiment 3

[0107] Using a glass bead mill, 40 g of silicon-treated zinc oxide (MZ-507S) manufactured by Teika was stirred for 3 hours in 30 g of lauryl methacrylate (SP value 8.7) and 30 g of ethylene glycol dimethacrylate (manufactured by Otsuka Electronics Co., Ltd. The average particle diameter of zinc oxide measured by ELS-8000 is 0.3 μm). Thereafter, 1.5 g of 2,2'-azobis-2,4-dimethylvaleronitrile were added. Dissolve 30g of polyvinyl alcohol (EG-30 manufactured by Nippon Synthetic Chemical Industry Co., Ltd.) and 1g of sodium stearyl methyl taurate in 500g of ion-exchanged water, add them to the above-mentioned zinc oxide slurry, and disperse them using Mielda- (made by Dokujo Works). The average particle diameter of the emulsion measured by LA-910 is 2.0 μm). Next, put the dispersion into a 1000mL separable beaker, replace it with nitrogen, heat up to 60°C while stirring at 200r / min, keep it at 60°C for 2 hours, then raise the temperature to 80°C, Polymerization was carried out u...

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Abstract

The invention provides a polymer composite particle having superb blending stability even in a W / O emulsion cosmetic, a highly effective ultraviolet protection effect and a good feeling in use. The invention also relates to a method of producing the polymer composite particle and a cosmetic composition containing the polymer composite particle. A preferred polymer composite particle contains a metal oxide coated with a silicone and / or fluorine compound and has an average particle diameter of 1 mu m or less, wherein the polymer composite particle is obtained by polymerizing a crosslinking agent with a vinyl monomer contained in an amount of 25% by weight based on 100% by weight of the sum of total of all the monomers and crosslinking agent and wherein the vinyl monomer has a solubility parameter calculated by the Fedors method of less than about 8.9. A preferred cosmetic composition may contain (A) a microparticle metal oxide having an average primary particle diameter of from 0.001 to 0.1 mu m, and (B) a flake zinc oxide having an average primary particle size of from 0.1 mu m to 1 mu m and an average thickness of from 0.01 mu m to 0.2 mu m, which provides ultraviolet protection ability and visible-light transmittance.

Description

technical field [0001] The present invention relates to metal oxide-containing composite polymer particles excellent in compounding stability, usability, and ultraviolet protection ability for W / O-based cosmetics, a method for producing the same, and cosmetics containing the composite polymer particles. Background technique [0002] In cosmetics, ultraviolet absorbers are used for the purpose of protecting the skin from ultraviolet rays. Ultraviolet absorbers can be broadly classified into organic and inorganic systems. The former include cinnamic acid derivatives, benzophenone derivatives, methylaminobenzoic acid derivatives, and salicylic acid derivatives. The latter include zinc oxide , titanium oxide, cerium oxide, iron oxide and other metal oxides. In the case of an organic ultraviolet absorber, there are problems that the absorption wavelength range is low, the compound is unstable, and the effect of penetrating into the skin cannot be sustained. In the case of an in...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/11A61K8/27A61K8/29A61Q17/04C08F292/00C08L51/10
CPCA61K8/02A61K2800/651A61K8/27A61K2800/63A61K8/0241A61K8/11C08F292/00C08L51/10A61Q17/04A61K8/29A61K2800/412Y10T428/25Y10T428/2991Y10T428/256Y10T428/2998C08L2666/02
Inventor 辻诚南部博美井上真菅原智猪股幸雄
Owner KAO CORP
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