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Silica-coated silicone rubber particles and cosmetic

A technology of silicone rubber particles and silicon dioxide, applied in cosmetics, cosmetics, cosmetic preparations and other directions, can solve the problems of undisclosed, undisclosed silicone particles, and the shape and properties of the particles have not been specifically described, and achieves high sphericity, The effect of reduced contact surface area and reduced viscosity

Active Publication Date: 2018-10-23
WACKER CHEM GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] However, the shape and properties of the particles have not been specifically described
Furthermore, no specific method has been disclosed for obtaining these particles industrially
Furthermore, no specific method for obtaining the properties of silicone particles necessary for their application has been disclosed

Method used

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  • Silica-coated silicone rubber particles and cosmetic
  • Silica-coated silicone rubber particles and cosmetic
  • Silica-coated silicone rubber particles and cosmetic

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0157] Oil-in-water silicone emulsion 1 was prepared as follows. First, 5 parts by mass of silica particles (A) were dispersed in 45 parts by mass of water by stirring the mixture at 4,000 rpm using ULTRA TURRAX T50 base shaft generator G45M manufactured by IKA to prepare a water dispersion of silica particles liquid. Next, in another container, 47.9 parts by mass of vinyl-containing polydimethylsiloxane (I) (both ends of which are blocked by dimethylvinylsilyl groups and have a viscosity of 200 mPa·s (25 ℃)) and 2.1 parts by mass of methylhydrogenpolysiloxane (II) having SiH groups in the side chain (both ends of the molecular chain are blocked by trimethylsiloxy groups and the viscosity is 65mPa·s (25°C )). Accordingly, a mixed oil in which the NH / NA ratio between the number of alkenyl groups (NA) and the number of hydrogen atoms bonded to silicon atoms (NH) was 1.2 / 1 was prepared. Next, the prepared mixed oil was added to the aqueous dispersion of silica particles under ...

Embodiment 2

[0161]Silicone rubber particle dispersion emulsion and silicone rubber particles were obtained in the same manner as in Example 1, except that, in the silicone emulsion in Example 1, 49.0 parts by mass of Vinyl polydimethylsiloxane (I) and 1.0 parts by mass of methylhydrogen polysiloxane (II) were mixed to prepare the number of alkenyl groups (NA) and the number of hydrogen atoms bonded to silicon atoms (NH ) ratio NH / NA is 1.5 / 1 mixed oil. The obtained silica-coated silicone rubber particles comprise silicone rubber particles and a silica coating layer which completely or partially coats the surface of the silicone rubber particles.

[0162] The particle diameter of the obtained silicone rubber particle dispersion emulsion was measured by a Beckman Coulter LS230 (manufactured by Beckman Coulter Corporation). Therefore, it was confirmed that the median diameter d50 was 11 μm.

Embodiment 3

[0164] Silicone rubber particle dispersion emulsion and silicone rubber particles were obtained in the same manner as in Example 1, except that the amount of silica particles of component (A) in the silicone emulsion 1 of Example 1 was 3.0 parts by mass, The rest is water. The obtained silica-coated silicone rubber particles comprise silicone rubber particles and a silica coating layer which completely or partially coats the surface of the silicone rubber particles.

[0165] The particle diameter of the obtained silicone rubber particle dispersion emulsion was measured by a Beckman Coulter LS230 (manufactured by Beckman Coulter Corporation). Therefore, it was confirmed that the median diameter d50 was 11 μm.

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Abstract

To provide particles that are free of particle blocking, that have a particle shape close to a perfect sphere, that are also industrially advantageous and allow easy reaction control, and that have exceptional properties such as dispersion stability, stability during particle isolation, and physical stability. These silica-coated silicone rubber particles have silicone rubber particles, and a coating layer that covers the surface of the silicone rubber particles and that comprises silica particles. The coating level of the coating layer is from 2.0 * 10-9 to 3.2 * 10-6 kg / m<2>, and the sphericity is from 0.8 to 1.0.

Description

technical field [0001] The present invention relates to silica-coated silicone rubber particles having advantageous properties, such as having an almost true spherical shape to exhibit less blocking. Background technique [0002] Since silicone rubber particles have high viscoelasticity, light scattering, transmittance, and oil absorption properties due to their wide surface area, they are widely used in industrial fields such as cosmetics, synthetic resin materials, and synthetic rubber materials. [0003] The formulation of silicone powders in cosmetics to be applied to the skin is under consideration for improving post-application feel, achieving apparent smoothness, and absorbing sebum to prevent makeup from clouding. Cosmetics have various forms such as oil, water-in-oil, and oil-in-water depending on the use. In particular, in recent years, the oil-in-water form tends to be preferred because of its excellent touch after application. However, since silicone powder is ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G77/50A61K8/06A61K8/891A61K8/895A61Q17/04A61Q19/00C08K3/36C08L83/05C08L83/07
CPCA61Q17/04A61Q19/00A61K8/895C08K3/36A61K8/25A61Q1/02A61K8/025A61K2800/412A61K2800/621A61K2800/623A61K2800/654C09D183/04C08G77/12C08G77/20C08K9/06C08L83/04C08K5/56C08L83/00A61K8/06A61K8/891C08G77/08C08G77/16C08J3/128C08K2201/013C08G77/50A61K8/0245C09C1/3081
Inventor 五十岚宪二
Owner WACKER CHEM GMBH
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