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External preparation for skin

A technology for skin and cosmetics, applied in the field of oil-in-water or water-in-oil emulsified sunscreen cosmetics, to achieve the effects of excellent ultraviolet blocking effect, good usability, excellent dispersion and stability

Inactive Publication Date: 2011-07-06
SHISEIDO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, even according to this method, it cannot be said that the uniformity of the water phase and / or the oil phase, as well as the emulsion stability, and the dispersibility of zinc oxide and / or titanium dioxide are sufficient

Method used

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  • External preparation for skin
  • External preparation for skin
  • External preparation for skin

Examples

Experimental program
Comparison scheme
Effect test

Embodiment I-1

[0205] Drop 10 μl of the following oils on the skin of the inner forearm, and measure the area (cm 2 ). The results are shown in Table I-1.

[0206] Table I-1

[0207] Oil

Area after one minute of dropwise addition (cm 2 )

[0208] Pentaerythritol tetracaprylate

1.0

Glyceryl Tricaprylate

2.2

squalane

2.4

Cetyl 2-ethylhexanoate

3.8

Diethylhexyl succinate

3.9

Tripropylene glycol pivalate

4.0

Isononyl isononanoate

4.5

Isononyl 2-Ethylhexanoate

6.5

2-Ethylhexyl 2-ethylhexanoate

7.2

[0209] The result of table I-1 shows, 2-ethylhexanoic acid isononyl ester and 2-ethylhexanoic acid 2-ethylhexyl ester are compared with other oils commonly used in cosmetics in the past, the spreadability on human skin ( Spreading value) high, with good skin absorption.

[0210] In addition, isononyl 2-ethylhexanoate is not included in the prescribed standard...

Embodiment I-2

[0212] The usability (skin absorbability) of various ester oils blended in the oil-in-water emulsified cream system was evaluated as follows.

[0213] That is, the "skin absorption" was evaluated according to the following evaluation criteria about the samples with the compositions shown in the following Table I-2. The results are shown in Table I-2.

[0214] (evaluation standard)

[0215] ◎: strong feeling of skin absorption

[0216] ○: Skin absorption can be felt

[0217] △: Slightly absorbed by the skin

[0218] ×: No feeling of skin absorption

[0219] Table I-2

[0220]

[0221] Trisodium EDTA

[0222] Cetearyl / Stearyl Alcohol Glucoside

[0223] The results of Table I-2 show that sample A and sample B with 2-ethylhexyl 2-ethylhexanoate and isononyl 2-ethylhexanoate, and sample C with ester oil commonly used in the past Compared with , D, and E, the skin absorption is good. In particular, sample A has remarkably superior skin absorbab...

Embodiment I-3～I-12 and comparative example I-1～I-4

[0225] According to the formulations shown in the following Tables I-3 to I-4, skin creams as oil-in-water emulsified skin cosmetics were produced by the following method.

[0226] (Manufacturing method)

[0227] (1)~(11) were uniformly mixed and dissolved at 70°C (oil phase). Separately, (12) to (24) were uniformly mixed and dissolved at 70°C (aqueous phase). Next, the oil phase at 70°C was gradually added to the water phase kept at 70°C, and emulsified with a homogenizer while adding. After the emulsification is completed, it is quenched to below 40°C to obtain the target oil-in-water emulsified skin cream. The obtained creams (samples) were evaluated for stability and usability (spreadability on the skin, skin absorption, stickiness, smoothness, softness, and firmness) by the following test methods. The results are shown in Tables I-3 to I-4.

[0228] [Stability test]

[0229] The sample was placed at 50°C, and after standing for one month, its appearance was observed ...

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Abstract

An external preparation for skin comprising isononyl 2-ethylhexanoate and / or 2-ethylhexyl 2-ethylhexanoate (a component (a)); an oil-in-water type emulsion skin cosmetic comprising the component (a), (b) one or more members selected from higher fatty acids and higher alcohols which are in a solid or a semi solid form at normal temperature (25 DEG C), (c) a homopolymer, a copolymer or a crosspolymer containing as a constituent unit, one or more members selected from 2-acrylamido-2-methylpropanesulfonic acid, acrylic acid and derivatives thereof, or a mixture thereof, and (d) one or more members selected from nonionic surfactant having an HLB value of 9 or greater; and an oil-in-water type or a water-in-oil type emulsion sunscreen cosmetic comprising (a) isononyl 2-ethylhexanoate and / or 2-ethylhexyl 2-ethylhexanoate, (b) an ultraviolet light absorber, (c) an ultraviolet light scattering agent, and (d) a silicone oil.

Description

technical field [0001] The present invention relates to skin external preparations and oil-in-water emulsified skin cosmetics containing specific 2-ethylhexanoate. In addition, the present invention relates to oil-in-water or water-in-oil emulsified sunscreen cosmetics. More specifically, the present invention relates to oil-in-water or water-in-oil emulsified cosmetics that are excellent in usability and formulation stability and can achieve a high SPF value. Sunscreen cosmetics. Background technique [0002] In the past, the oil-in-water emulsified skin cosmetics showed moisturizing feeling, smooth extensibility, soft feeling, etc., and high fatty acids such as stearic acid, palmitic acid, myristic acid, behenic acid; Vaseline, Brazil Palm wax, candelilla wax, ozokerite, microcrystalline wax and other waxes; solid oils such as lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol, behenyl alcohol and other higher alcohols are emulsified with emulsifiers Met...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): A61K8/37A61K8/06A61Q17/04
Inventor 大村孝之高仓喜仁
Owner SHISEIDO CO LTD
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