JPH08119845A - Emulsion-based skin cosmetic - Google Patents

Abstract

PURPOSE: To obtain an emulsion-based skin cosmetic, comprising a pearl powder prepared by pulverizing a pearl formed in a saltwater and/or a limnetic shellfish and capable of protecting the skin from sunburn and imparting moistness without remaining white and causing stickiness. CONSTITUTION: This emulsion-based skin cosmetic is obtained by blending a pearl powder prepared by pulverizing a pearl formed in a saltwater and/or a limnetic shellfish (e.g. Pinctada fucata martensii Dunker, Pinctada margaritifera Linnaeus or Hyriopsis schlelii Martens) and has 1000-30000cP viscosity at 25 deg.C measured with a Brookfield type viscometer. Furthermore, the particle diameter of the pearl powder is preferably 50-200μm from aspects of dispersibility. The amount of the blended pearl powder is preferably 0.05-5.0wt.% in the total weight of the cosmetic. The coating treatment of the powder surface with an anionic or a nonionic surfactant may be carried out in order to further improve the dispersibility thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an emulsified skin cosmetic which protects the skin from sunburn and does not leave the skin white and gives a moist feeling to the skin.

[0002]

2. Description of the Related Art In general, skin cosmetics for preventing inflammation caused by ultraviolet rays contain titanium oxide, zinc oxide powder, and p-aminobenzoic acid, salicylate and other ultraviolet absorbers. Has been done. However, when titanium oxide and zinc oxide are applied to the skin, they remain white and have an unnatural finish, which is unfavorable for cosmetics. In addition, conventional UV absorbers often cause skin irritation in many cases.
Furthermore, the titanium oxide, zinc oxide, and ultraviolet absorber described above cannot be expected to have a skin-beautifying effect of moisturizing the skin. Therefore, in order to impart a beautiful skin effect, mucopolysaccharides, collagen, placenta extract and the like are often mixed, but they have a feeling of stickiness when applied to the skin, and improvement thereof has been demanded.

In view of these conventional problems, an object of the present invention is to provide an emulsified skin cosmetic which protects the skin from sunburn and gives a moist feeling to the skin without whitening and stickiness. To do.

[0004]

[Means for Solving the Problems] The above object is to incorporate pearl powder obtained by crushing pearls formed from seawater and / or freshwater shellfish, and to obtain a viscosity of 25 by a B-type rotational viscometer. This can be achieved by using an emulsified cosmetic having a temperature of 1,000 to 30,000 cps. The measurement conditions of the viscosity by the B-type viscometer are:
Use No3 or No4 adapter at 25 ℃, 1
It shall be measured at a rotation speed of 2 rpm or 30 rpm. The emulsified skin cosmetics described above have the effect of preventing the inflammation of the skin caused by the ultraviolet rays of pearl powder, the transparency of the pearl powder, and the beautiful skin effect to give a natural finish and moisturizing effect. When the emulsified skin cosmetic having a specific viscosity mixed with powder is applied to the skin, the effect of preventing skin irritation due to ultraviolet rays and the skin beautifying effect are further improved.

The pearl powder used in the present invention is a spherical or amorphous metabolite formed in the body of sea mussels such as pearl oyster, black pearl oyster, white pearl oyster, mabe and abalone, and freshwater mussels such as mussel. The cultivated or natural pearls that are, which are crushed by a known method such as a ball mill, a jet mill, and a turbo mill, are sieve-selected,
It is a white to pale yellow powder.

The particle size of the pearl powder used in the present invention is such that the pearl powder can be industrially produced, the particle size at which the pearl powders do not aggregate into agglomerates, and the dispersibility in cosmetics. Therefore, 50 to 200 μm is preferable. The amount of the pearl powder is 0.05 to 5.0 in the total weight of the emulsified skin cosmetic in order to protect the skin from sunburn, to prevent whitening on the skin, and to impart a moist feeling without sticking the skin. Weight percent is preferred.

The emulsion-type skin cosmetic of the present invention needs to be a cream or emulsion-type emulsion-type cosmetic because of the dispersion stability of pearl powder, and has the effect of preventing skin irritation due to ultraviolet rays. The B-type rotational viscometer needs to have a viscosity of 1,000 to 30,000 cps. That is, the viscosity is 1
If it is less than 1,000 cps, the UV protection effect is insufficient when it is actually applied to the skin, while if it exceeds 30,000 cps, it is not desirable because it becomes whitish when applied to the skin. It is necessary to adjust so that the viscosity is up to 30,000 cps.

In order to further improve the dispersibility of the pearl powder used in the present invention, the surface of the pearl powder may be coated with an anionic surfactant or a nonionic surfactant. Examples of anionic surfactants include fatty acid soaps, ether carboxylic acids, carboxylates such as N-acyl amino acid salts, higher alkyl sulfonates, α-olefin sulfonates, higher fatty acid ester sulfonates, and alkylallyl sulfonates. Salt, alkyl sulfate ester salt, secondary higher alcohol sulfate ester salt, alkyl and alkyl allyl ether sulfate ester salt, sulfate ester salt of higher fatty acid ester, sulfate ester of higher fatty acid alkylolamide, etc., polyoxyethylene alkyl ether Examples thereof include phosphoric acid esters such as phosphoric acid ester salts.

As the nonionic surfactant for coating the pearl powder, polyethylene glycol alkyl ether, polyethylene glycol sorbitan alkylate, glycerin alkylate, polyethylene glycol hydrogenated castor oil, polyethylene glycol alkylphenol ether, polyoxyethylene polyoxy. Examples include propylene block polymers. Particularly preferably,
It is an anionic surfactant.

As a method for coating the pearl powder, a method of treating the pearl powder with a solution of a surfactant and drying it, or a dry method of coating the pearl powder with a mixture of the surfactant and the pearl powder by stirring. I can. Further, the amount of the surfactant to be coated is preferably 1 to 20% by weight, when the total amount of the coated pearl powder is 100% by weight.

The emulsified skin cosmetic of the present invention is obtained by heating and dissolving an oil phase and an aqueous phase, and emulsifying and dispersing them using one or more anionic, cationic and nonionic surfactants. It can be produced by a usual method of cooling. The viscosity can be adjusted by a known method such as the balance of the emulsified system, the amount of wax in the oil phase, or the addition of a thickener such as xanthan gum, alginic acid, sodium polyacrylate, and bee gum.

The emulsified skin cosmetic of the present invention comprises
It can be used for emulsion or creamy skin cosmetics such as aqueous or oily skin milk, skin cream, foundation, base foundation, hand cream, body milk, sunscreen, etc. , A fragrance, an antiseptic, an antioxidant and the like can be appropriately added within the range where the object of the present invention is achieved.

[0013]

EXAMPLES The present invention will now be described in detail with reference to examples, but the present invention is not limited thereto.

The UV protection effect test and sensory test in the examples were carried out as follows. (1) Ultraviolet ray prevention effect test The measurement method was as follows: 20 mg of each sample was applied to the site of the back of five people while spreading it with a finger, which is the usual way of using cosmetics, and 1
After 5 minutes, UV-A irradiation was performed. UV-A irradiation was performed with a BLB lamp at 365 nm, and ultraviolet rays having an energy amount of 9 J / cm ² were irradiated, and erythema after irradiation for 24 hours was compared with Comparative Example 1, and "effective", "slightly effective" in ultraviolet ray prevention effect, The evaluation was made in three grades of "invalid", and the number of persons judged to be "effective" and "somewhat effective".

(2) Sensory test Each sample was applied to the forearm of 20 female test subjects once a day and continuously used for 10 days, and then each sample was evaluated by a sensory test. The test results are shown by the number of people who answered "good" for each test item.

Examples 1 to 3 and Comparative Examples 1 to 4 In the composition ratios shown in Table 1 below, a conventional emulsification method, in which an oil phase and an aqueous phase are respectively heated and dissolved, is emulsified and dispersed, followed by cooling. Manufactured cosmetics. The pearl powder used had a particle size of 100 μm, and the surface of the pearl powder was “coated” with sodium cetyl sulfate and carboxylated polyoxyethylene tridecyl ether (6 EO) at a ratio of 3: 1 to 15%. An amount of wt% coated was used. Then, each of the obtained samples was subjected to the above-mentioned ultraviolet ray protection effect test and sensory test, and the results shown in Table 2 below were obtained.

[0017]

[Table 1]

[0018]

[Table 2]

As can be seen from Table 2 above, even if the pearl powder is blended, if the viscosity is less than 1,000 cps, the effect of preventing ultraviolet rays is unsatisfactory, and if the viscosity exceeds 30,000 cps, the skin becomes whitish. This is an unfavorable result, and it is considered that this phenomenon is due to the formation and uniformity of the coating film due to thixotropy when applied to the skin. On the other hand, titanium oxide has an ultraviolet ray-preventing effect, but the skin becomes whitish and uncomfortable, and it was not possible to impart a moist feeling to the skin.

[0020]

As described above, it is possible to provide an emulsified skin cosmetic which protects the skin from sunburn, does not leave the skin white, and gives the skin a moist feeling.

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Claims (1)

[Claims] 1. A pearl powder obtained by crushing pearls formed from seawater and / or freshwater shellfish is blended, and the viscosity by a B-type rotational viscometer is 25 ° C. to 1,000 to 30,000 cps. An emulsified skin cosmetic.