KR100304815B1 - Sunscreen cosmetic composition - Google Patents

Abstract

PURPOSE: A sunscreen cosmetic composition is provided, thereby protecting the skin effectively from th ultraviolet rays, and inhibiting white turbidity on the skin. CONSTITUTION: The sunscreen cosmetic composition contains 30 50 part by weight of zinc oxide as an ultraviolet ray preventing agent, 10 to 95 part by weight of an oil dispersing solvent and an oil denaturation controlling agent, in which the oil dispersing agent is selected from silicon oil, linear or branched higher fatty acid ester and higher fatty acid alcohol; the oil denaturation controlling agent is selected from aluminium magnesium hydroxystearate, silica, silicone resin, methylmethacrylate crosspolymer and dextrin palmitate; and the zinc oxide has diameter of 0.01 to 0.05 micrometer and is coated with silicon or derivative thereof.

Description

Cosmetic composition for preventing burnout

1 is a graph showing the ultraviolet protection effect (SPF) according to the zinc oxide content.

2 is a graph showing the turbidity in skin coating according to zinc oxide content.

[Purpose of invention]

The present invention relates to a cosmetic composition for preventing burnout. More specifically, the present invention relates to an anti-fog cosmetic composition containing ultra-fine powder zinc oxide, an oily acid solvent, and a rheology modifier, which maximizes the anti-fouling effect and there is no further increase in cloudiness when applied to the skin.

[Technical Field to which the Invention belongs and Prior Art in the Field]

In general, ultraviolet rays are classified into three areas according to wavelengths, and recently, there are recent reports that they cause various skin diseases when excessively irradiated to the skin. These UV rays are long-wave ultraviolet rays (UV-A) that cause skin aging (sun tanning) or premature aging of the skin after long-term coating, and medium-wave ultraviolet rays (UV-B) that cause skin irritation such as inflammation of the skin and erythema. Is broken down into short-wave ultraviolet (UV-C) light that is absorbed in the air and hardly reaches the surface. For the purpose of protecting the skin from ultraviolet rays, anti-fog cosmetics have been developed in the past, and research is being actively conducted.

The quality requirement of antiseptic cosmetics is to have absorption spectrum of sufficient intensity in ultraviolet ray. It is safe for skin. It is not easy to be wiped out by sweat and water. It is easy to apply to skin and is comfortable even after application. There may be no such thing. In order to satisfy such quality requirements, conventional anti-burn cosmetics are mainly composed of oil-in-oil emulsion, oil-in-oil emulsion, or cream-like cosmetics, and researches on them have enhanced water resistance using cross-polymers. Compared to US 52-07998, which uses titanium oxide and chemical sunscreen in combination with EP 46-1497, which improves water resistance using copolymers, and zinc oxide and chemical sunscreen in combination with chemical sunscreen. JP 86-57266 using zinc oxide with less turbidity.

On the other hand, the raw material that blocks the ultraviolet rays are largely divided into chemical blockers and physical blockers. Excessive chemical sunscreen can cause skin irritation and various troubles, so most countries have a formula limit. Physical sunscreens, i.e. inorganic pigments, are relatively safe for the skin and have recently been spotlighted. However, they have many problems in whitening and applicability to the skin when used excessively. In particular, clouding was one of the main complaints of customers about anti-burn cosmetics. The physical sunscreen is mainly used titanium dioxide and zinc oxide of the ultra-fine particle powder, zinc oxide of the ultra-fine particle powder in particular has a relatively low skin turbidity and is absorbing more attention by absorbing ultraviolet rays of long and medium wavelengths. Studies on the anti-sunburn cosmetics by these physical sunscreens include WO 93-11742, EP 55-9319 using iron oxide, titanium oxide and zinc oxide, and US 52-50289 using titanium oxide having a particle size of 5-50 nm. Still, many problems have been pointed out to suppress skin whitening and effective sun protection.

[Technical Challenges to Invent]

Accordingly, the present inventors have diligently studied how to simultaneously maximize the sunscreen effect without increasing the cloudiness, and found that a cosmetic composition containing ultrafine powder zinc oxide, an oily acid solvent and a rheology modifier is very effective. The present invention was completed.

Composition and Action of the Invention

The present invention relates to a cosmetic composition for preventing burn-up, characterized in that it contains 5-50 parts by weight of zinc oxide as a sunscreen, an oily dispersion solvent and a rheology modifier.

Ultrafine powdered zinc oxide with a particle size of 0.01 μm-0.05 μm does not change the turbidity of the skin even if it is used from 5 parts by weight to 50 parts by weight, which is especially a rheological agent that can make its dispersion solvent and skin coating uniform. Regulatory substances have a surprisingly large effect. Zinc oxide is contained as 5 to 50 parts by weight, preferably 30 to 50 parts by weight, as a sunscreen. Zinc oxide is preferably used that is surface-treated with silicon or a derivative thereof.

As a dispersion solvent of ultrafine powdered zinc oxide, it is selected from hydrocarbon, higher fatty acid ester, higher fatty alcohol, and higher fatty acid ester oil, and especially linear or branched higher fatty acid ester or higher fatty alcohol is effective. Silicone oil solvents are effective mixtures of phenyltrimethicone and volatile cyclic silicon. It is preferable to contain 10-95 weight part of dairy acid solvents.

Rheological modifiers are preferably aluminum magnesium hydroxystearate, silica, silicone resins, methyl methacrylate crosspolymers, hyperlin palmitates or mixtures thereof. In other words, by using an effective dispersion solvent and rheology modifiers, a large amount of titanium oxide can be dispersed in an optimal state.

When using the solvent and rheology control material as described above, even if 5 to 50 parts by weight of ultrafine powdered zinc oxide is used, the cloudiness of the skin does not increase more than 30 parts by weight. Within minutes, the cloudiness disappears surprisingly. Previous studies have shown that up to 30 parts by weight of ultrafine zinc oxide, a causative agent of skin turbidity (JP 95-23294), is mainly due to the usability and cloudiness when applied to the skin.

According to the present invention, as the amount of ultrafine powdered zinc oxide increases, the sunscreen effect increases quantitatively, but the turbidity of the skin is saturated even when the ultrafine powdered zinc oxide is saturated at around 30 parts by weight, so that even more than 50 parts by weight of the cloudy phenomenon occurs. It did not appear to increase. That is, with the same turbidity, maximum UV blocking effect can be obtained. On the other hand, the use of more than 50 parts by weight and dense problem may occur. The reason for this is thought to be that the spreading, adhesion and uniformity and applicability of their skins are generally greater along with the dispersing power of known dispersing solvents. Of course, when combined with commonly known chemical UV blockers such as benzophenone, benzoic acid, nitro, etc. can increase the UV protection effect, but in terms of skin safety, the amount of the polymer organic sunscreen that is less used or less skin irritant Combination is recommended.

The anti-burn cosmetic composition according to the present invention can be formulated in a water-in-oil emulsion or oil dispersion type.

Hereinafter, although this invention is demonstrated concretely based on an Example, the technical scope of this invention is not limited to these.

EXAMPLE

Experimental samples were prepared by a conventional method using a homomixer after heating and dissolving the oil and water phases at 75-78 degrees, respectively. In Example 1-5, isotaryl myristate, which is a branched higher fatty acid ester, and cyclomethicone, which is a cyclic silicon in silicone oil, were used as a dispersion solvent, and an aluminum magnesium hydroxystearate was used as a rheology modifier. . The components of the cosmetic compositions of Examples and Comparative Examples and their contents are shown in Table 1 below.

TABLE 1

The sunscreen effect and turbidity of the cosmetic compositions of Examples 1-5 and Comparative Examples 1-3 were tested as follows.

1. UV protection effect experiment

In order to more easily and accurately measure the sunscreen effect (hereinafter referred to as SPF), SPF was measured by the following in vitro method (this method was evaluated in vivo in Korean Society for Cosmetics, Vol. 21, No. 2, pp. 57-72). Compared with the result, the correlation coefficient is over 0.95). Using the cosmetic compositions of Examples 1, 2, 4, and 5 as samples, a Transpore ^R tape having surface curvature similar to the skin surface was used. The sample was applied at the same 2mg / ㎠ using a surgical glove, measured 15 minutes after the application using a SPF-290 (Optometrics, USA) analyzer. In more detail, Multiport Solar UV Simlator (USA, Solar light Co.) was used as a light source, and a radiometer (USA. International Light Ltd.) equipped with a UVB probe was used as a detector. The measurement method was measured by measuring the time (t) to reach 45mJ / ㎠, which is the amount of light per GO, to the minimum erythema of skin type III at the light intensity of 3.7 x 10W / ㎠. Figure 1 shows that the SPF increases quantitatively with the zinc oxide content.

2. White turbidity test

1) In vitro method

The following experimental methods were used to see the turbidity in skin application. Comparative Examples 1, 2, 3 and Examples using surgical gloves at the inner region of the upper arm region of the arm in a constant temperature and humidity room (22 ° C, 45% relative humidity) Cosmetic compositions of 1, 2, 4, 5 were applied in the same 2mg / ㎠ as a sample and after 5 minutes was measured using Chromameter CR-200 (Japan Minolta Co.). The results are shown in Figure 2.

2) Customer sensory test

General 20 20-35 year old females were evaluated for their satisfaction with turbidity after applying the cosmetic products of Comparative Examples and Examples to the face according to the general usage. The evaluation scores were very satisfied: 2 points, satisfaction: 1 point, normal: 0 points, bad: -1 points, very bad: -2 points.

The evaluation results are shown in Table 2 below.

TABLE 2

As shown in Fig. 2 and Table 2, as the content of zinc oxide increases to 30 parts by weight, the turbidity increases, but the content of zinc oxide is almost constant, and the content of zinc oxide is 30 to 50 parts by weight. The turbidity increased again at. This is consistent with the customer's sensory evaluation results, and it can be seen that the clouding phenomenon is surprisingly eliminated within 5-10 minutes after application to the skin.

Claims (3)

Zinc oxide as an anti-scavenger 30-30 parts by weight, oil-based dispersion solvent 10-95 parts by weight and anti-pigmented cosmetic composition, characterized in that it contains a rheology control. The oil-based dispersion solvent of claim 1 is at least one selected from silicone oil, linear or branched higher fatty acid esters and higher fatty acid alcohols, and the rheology modifier is aluminum magnesium hydroxystearate, silica, silicone resin, Anti-nitrogen cosmetic composition, characterized in that at least one selected from methyl methacrylate crosspolymer and dextrin palmitate. The composition of claim 1, wherein the zinc oxide has a particle size of 0.01-0.05 μm and is surface-treated with silicone or a derivative thereof.