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Resin powder including ultraviolet scattering agent, production method therefor, and cosmetic

A technology of resin powder and ultraviolet rays, which is applied in the direction of medical preparations, cosmetics, and cosmetic preparations containing active ingredients, can solve the problems of reduced ultraviolet scattering, increased viscosity of cosmetic materials, and reduced ultraviolet scattering, so as to inhibit the skin Direct contact, high practicability and effectiveness, and high safety effects

Inactive Publication Date: 2016-01-06
DAICEL EVONIK LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, in the case of zinc oxide, there is also a disadvantage that if a large amount is added to the cosmetic material, the zinc ions will almost cross-link the additive of the cosmetic material, and the viscosity of the cosmetic material will increase.
However, since it is included in the matrix component, it is easy to reduce the ultraviolet scattering effect
In particular, since the composite particles of this document are spherical and adopt a form close to agglomeration, it is easy to significantly reduce the ultraviolet scattering effect.

Method used

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  • Resin powder including ultraviolet scattering agent, production method therefor, and cosmetic
  • Resin powder including ultraviolet scattering agent, production method therefor, and cosmetic
  • Resin powder including ultraviolet scattering agent, production method therefor, and cosmetic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0102]Use titanium oxide particles [titanium dioxide, manufactured by Dupont, Ti-Pure (R) Titanium Dioxide Pigment-Paint Coatings-DryGradesR-105, surface treatment (silica, alumina dimethyl siloxane treatment) product] 50 parts by weight, polyamide Resin (polyamide 12, manufactured by Daicel-Evonik) 50 parts by weight, the same as Example 1 of Japanese Patent Application Laid-Open No. 2005-179646, obtained polyamide particles (spherical shape, average particle diameter 4.1 μm, The proportion of titanium oxide particles is 50% by weight).

[0103] Then, plate formation was performed by crushing the obtained particles in water at a ratio of 10% by weight using a ball mill. It should be noted that the medium type of the ball mill used at this time used high-purity alumina beads (particle diameter: 0.5 mm), and the volume of the dispersion liquid was the same as the volume of the medium.

[0104] figure 1 An electron micrograph (1500 times) of the obtained platy powder is shown....

Embodiment 2

[0111] In addition to using 50 parts by weight of zinc oxide particles (average particle diameter 20 nm, manufactured by Sakai Chemical Industry Co., Ltd., "FINEX-50S-LP2", surface-treated (organopolysiloxane) product) instead of titanium oxide in Example 1 , and in the same manner as in Example 1, polyamide particles containing zinc oxide particles (spherical shape, average particle diameter 4.5 μm, ratio of zinc oxide particles 50% by weight) were obtained.

[0112] Furthermore, the obtained pellets were formed into plates in the same manner as in Example 1.

[0113] image 3 An electron micrograph (1500 times) of the obtained platy powder is shown. It should be noted that, for comparison, Figure 4 An electron micrograph (magnification 1500) of polyamide particles themselves (polyamide particles before plate-forming treatment) including zinc oxide particles is also shown. As is clear from these photographs, each polyamide pellet was plated.

[0114] It should be noted t...

Embodiment 3

[0119] Except changing the polyamide resin in embodiment 1 from 50 parts by weight to 40 parts by weight, it is the same as in embodiment 1 to obtain polyamide particles (spherical shape, average particle diameter of 4.5 μm, the size of titanium oxide particles) comprising titanium oxide particles The proportion is 55% by weight).

[0120] Furthermore, the obtained pellets were formed into plates in the same manner as in Example 1. The average thickness of the plate-shaped powder was 1.1 μm, and the average diameter was 29 μm.

[0121] In addition, when the UV transmittance was measured in the same manner as in Example 1, it was 28% at 300 nm, 28% at 330 nm, 28% at 360 nm, and 29% at 400 nm.

[0122] It should be noted that when the ultraviolet transmittance of the polyamide particles themselves (polyamide particles before plate treatment) containing titanium oxide particles was measured by the same method, it was 42% at 300nm and 42% at 330nm, 40% at 360nm and 41% at 400nm....

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Abstract

A resin powder including an ultraviolet scattering agent (such as titanium oxide particles or zinc oxide particles) is processed into plates. Examples of the ultraviolet scattering agent are titanium oxide particles and zinc oxide particles having a mean particle size of 100 nm or smaller. In addition, the resin forming the resin powder may be, in particular, a thermoplastic resin (for example, a polyamide resin). Such a plate-like resin powder may be a powder which is obtained by processing a plurality of resin particles including an ultraviolet scattering agent into plates. The resin powder obtained thereby has excellent ultraviolet ray scattering capabilities.

Description

technical field [0001] The present invention relates to a resin powder containing an ultraviolet scattering agent (or an ultraviolet blocking agent), a method for producing the same, and a cosmetic material containing the above resin powder. Background technique [0002] In order to protect the skin from harmful ultraviolet rays, various cosmetics such as sunscreens and anti-UV foundations have been developed so far. Among them, the most common technique is to mix ultraviolet scattering agents such as titanium oxide or zinc oxide as additives in cosmetics. [0003] For such ultraviolet scattering agents, the smaller the particle size, the higher the ultraviolet scattering effect, and the ultraviolet scattering agents used in cosmetics generally have particle diameters on the order of nanometers. However, the harmfulness of nano-scale substances in contact with the skin has not been fully verified. Although the field is different, asbestos nano-whiskers lead to lung cancer ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): A61K8/02A61K8/27A61K8/29A61K8/88A61Q17/04
CPCA61K8/27A61K8/29A61Q17/04A61K8/88A61K8/0283A61K2800/412A61K8/0254A61K2800/74C08K3/22C08K2003/2241C08K2003/2296
Inventor 六田充辉井口浩文
Owner DAICEL EVONIK LTD
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