Water-in-oil emulsified cosmetics

Abstract

The present invention provides a water-in-oil type emulsified cosmetic that maintains excellent stability even when polar oil is blended, although it has a low viscosity. The water-in-oil emulsified cosmetic of the present invention is characterized by containing: (A) 0.1 to 2 mass % of organically modified clay minerals, (B) 0.1 to 2 mass % of hydrophobic silica, (C) silicone-based surface 2 to 5% by mass of active agent, (D) 10 to 50% by mass of the total oil is oil of non-polar hydrocarbon oil, and (E) 20 to 60% by mass of aqueous phase component, the aforementioned (A) organically modified clay mineral and (B) the total of hydrophobic silica is 0.2 to 2% by mass, and the viscosity of the cosmetic as a whole is 1,000 to 10,000 mPa·s (30°C, B-type viscometer).

Description

technical field [0001] The present invention relates to water-in-oil emulsified cosmetics. More specifically, it relates to a low-viscosity water-in-oil emulsified cosmetic that is excellent in stability and does not need to be re-emulsified by shaking at the time of use. Background technique [0002] Conventionally, water-in-oil emulsified compositions that use an oil phase as an external phase and a water phase as an internal phase can effectively spread oil-soluble active ingredients such as emollient oils, oil-soluble pharmaceuticals, and ultraviolet absorbers. On the skin, it is a dosage form suitable for external preparations for the skin, and is widely used in the field of cosmetics such as creams for skin care, lotions, and creams for hair care. [0003] However, most water-in-oil emulsified cosmetics achieve stabilization by gelling the oil constituting the external phase to fix water droplets and reduce the frequency of collisions between particles, which may inev...

AI Technical Summary

Problems solved by technology

[0005] However, in the conventional low-viscosity water-in-oil emulsified cosmetics as described above, when a polar oil is added to improve the feeling of use, etc., the distribution amount of the surfactant to the oil phase increases, making it difficult to emulsify, and the stability significantly impaired tendency

In addition, polar oils have the effect of stably dissolving various pharmaceuticals such as ultraviolet absorbers that have low solubility in nonpolar oils. The medicines to be mixed are limited, and it is difficult to mix medicines at a high level, etc.

As a result, for example, in order to obtain a high SPF effect, it is necessary to use a double-layer separation type in which the oil phase and the water phase are separated during storage, which is poor in operability and the like.

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