KR20010065703A - Solid cosmetic composition containing urea - Google Patents

Abstract

PURPOSE: A water-in-oil emulsion type cosmetic composition containing a large quantity of urea is provided, which is excellent in anti-inflammatory action and is handy to carry and convenient to use. CONSTITUTION: A solid cosmetic composition contains 15 to 40% by weight of oil(formula 1 or 2), 6 to 15% by weight of an oil gelling agent, 1 to 10% by weight of a mixture of a silicon surfactant and a surfactant of HLB of less 8 in a ratio of 2:1 to 5:1, 10 to 40% by weight of an ultraviolet violet screening powder, 5 to 20% by weight of a moisturizing agent, 5 to 20% by weight of urea, 0.25 to 10% by weight of lactone and 5 to 40% by weight of water.

Description

Solid cosmetic composition containing urea

The present invention is a water-in-oil type composition containing a large amount of urea, as well as excellent anti-inflammatory effect, and relates to a solid sunscreen cosmetic composition that is easy to carry and easy to use.

Urea, a commonly used ingredient in cosmetics, has been used in many functional cosmetic formulations because it has functions of skin moisturizing, anti-inflammatory and keratin softening depending on the amount used. In addition, this substance is attracting attention in the pharmaceutical industry as it is known to be toxic to human body because it is distributed in each organ and body fluid of our body. However, the fact that urea reacts with water when formulated in cosmetics causes decomposition and that the decomposition products not only raise the pH in the product but also release ammonia gas, limiting urea application. Therefore, in order to solve such a problem, U.S. Patent No. 5527961 acidifies the formulation using a little acid to complete the formulation. However, this has only a temporary effect and after some change over time, it also did not prevent the urea decomposition reaction. In addition, in US Pat. No. 4672078, lactones have been used to prevent the degradation of urea, but application is limited to fluid cosmetic formulations that are commonly used.

Currently, solid cosmetic compositions are classified into various types according to the purpose of use, but they are mainly applied to the skin by using solid oils, such as foundations using puffs, powders or pigments, formulations such as two-way cakes, and solidifying oils. It is mostly used in formulations such as lipsticks, and has been favored by consumers for its ease of use and portability. Due to these advantages, research is being actively conducted in the field of solid dosage forms in recent years, and there is a movement to change to a solidified dosage form in an emulsion form. However, most of the products already on the market are in the form of emulsions, but the water-based parts are applied less, which is not different from the feeling of existing formulations. Although oil was used, it was a big problem that the choice of powders or pigments used was restricted and the stability deteriorated rapidly depending on the type of powder. To solve this problem, U.S. Patent No. 5645903A discloses a patent for an oil-in-water solid cosmetic composition solidified using agar and gelatin. This seeps out of the container has the drawback. U.S. Patent No. 5362482A describes a water-in-oil type solid cosmetic composition, but the compatibility problem with the container has been eliminated, but there is a problem that the usability, which is a disadvantage of the water-in-oil type, is poor and a satisfactory result in product stability is not obtained.

As described above, various attempts have been made to apply urea to cosmetics, but satisfactory results have not been obtained.

The present inventors have conducted intensive studies to solve the conventional problems, and as a result, when urea is used together with 10 to 40% by weight of powder for solidifying the formulation and an oil gelling agent having a high melting point, the water of the water as well as the anti-inflammatory effect The present invention has been completed and found that the amount is relatively smaller than that of a conventional fluid formulation, so that a solid cosmetic having excellent stability can be obtained. The cosmetic composition thus developed has a soothing effect on the skin damaged by UV rays as well as UV protection.

The present invention is based on the total weight of the composition 15 to 40% by weight of oil, 6 to 15% by weight of the oil gelling agent, a mixture of a silicone surfactant and a surfactant of HLB 8 or less (mixed weight ratio 2: 1 to 5: 1, preferably Preferably 3: 1) 1 to 10% by weight, 10 to 40% by weight of the sunscreen powder, 5 to 20% by weight of a moisturizer, 5 to 20% by weight of urea, 0.25 to 10% by weight of lactone to prevent decomposition of urea and A water-in-oil type solid cosmetic composition containing 5 to 40% by weight of water.

In the present invention, when the urea content is less than 5% by weight, the anti-inflammatory effect may not be properly manifested, but when the amount exceeds 20% by weight, the amount of use thereof is excessive compared to the desired anti-inflammatory effect. In addition, when the content of lactone is less than 0.25% by weight does not effectively prevent urea decomposition, when it exceeds 10% by weight there is a disadvantage that the amount is excessive compared to the desired urea decomposition effect. In addition, the oil content affecting the hardness of the product is less than 15% by weight, the product becomes too hard and exceeds 40% by weight.

The solid cosmetic composition of the present invention is an ester oil obtained by condensing an alcohol having 3 to 16 carbon atoms and a fatty acid having 4 to 20 carbon atoms, an oil or fat obtained by condensing a fatty acid having 8 to 20 carbon atoms to glycerol, liquid paraffin, isoparaffin and squalane One species is selected from the group consisting of hydrocarbon oils, such as silicone oil.

Silicone oils used in the present invention are volatile oils represented by the following formula (1) or (2):

Where

j represents an integer of 0 to 3,

i represents the integer of 1-6.

Oil gelling agents used in the present invention are solid waxes and metallic soaps. Solid waxes are those having a melting point of 50 ° C. or higher and are linear or branched hydrocarbon waxes such as paraffin waxes having 25 to 52 carbon atoms, microcrystalline waxes, ozokerite, sericin, ester waxes, such as canova waxes, candrina Waxes are included. Metallic soaps include calcium stearate, calcium palmitate, lithium 2-ethylhexanoate and zinc stearate. These may be used on one paper.

The use ratio of the oil and the oil gelling agent in the present invention depends on the degree of softness of the product, but 20: 1 to 3: 1 is suitable.

As the silicone surfactant in the present invention, a compound of Formula 3 or Formula 4 is used:

Where

p represents 7 to 17,

q represents 1 to 100,

m represents 1 to 40,

n represents 0 to 200,

PE is-(C ₂ H ₄ O) _a (C ₃ H ₆ O) _b -H with a molecular weight of 250 to 2000, where a / b is 100/0 to 20/80,

d represents 50 to 70,

e represents 2 to 5,

f represents 8-12.

In the present invention, HLB 8 or less surfactants include sorbitan monoisostearate, sorbitan monooleate, sorbitan dioleate, sorbitan sesquioleate, sorbitan sesquiisostearate, glycerol monoisostearate, glycerol Diisostearate, glycerol monooleate, glycerol dioleate, glyceryl sesquioleate and the like.

The sunscreen used in the present invention refers to those commonly used in cosmetics, and the sunscreen powder refers to titanium dioxide and zinc oxide coated with silicon, and the sunscreen weight is 100% by weight to 60 to 100% by weight. Ultraviolet powder is occupied.

As the moisturizer, polyols such as glycerin, 1,3-butylene glycol, propylene glycol, sorbitol, and the like, which are commonly used in cosmetics, are used.

The composition of the present invention may be formulated into a lipstick using a foundation or two-way cake using a puff by compacting the pigment and applying it directly to the skin using an oil that solidifies.

Hereinafter, the present invention will be described in detail through comparative examples and examples. However, these examples are only for the understanding of the present invention, and the scope of the present invention in any sense is not limited to these examples.

Examples 1 to 3 and Comparative Examples 1 to 6

After dissolving the oil phase portion and the water phase portion described in Tables 1 and 2 at 78 to 80 ° C., respectively, the sunscreen and the sunscreen powder were dispersed in the heated oil phase and 4-5 at 5000 rpm using ROBO MIC of TOKUSHU KIKA. After stirring for a minute, the aqueous phase was slowly added, and then emulsified by stirring for 4 to 5 minutes at 5000 rpm using the same method, and then distributed in a container and cooled to room temperature to prepare Examples 1 to 3 and Comparative Examples 1 to 6. The completion of the water-in-oil type was confirmed as a completed formulation by measuring the electrical conductivity or, if this method is difficult, by spreading the product on the skin and inspecting the washability of water. In Tables 1 and 2 the units are weight percent.

Raw material name Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Paid DOW CORNONG 245 caprylic / capric triglyceride ceresin zinc stearate silicon surfactant HLB 8 or less surfactant 15.08.08.01.01.02.0 15.08.08.01.01.02.0 15.08.08.01.01.02.0 15.08.08.01.01.02.0 15.08.08.01.01.02.0 Sunscreen Octylmethoxy Cinnamate ZnO 3.020.0 3.020.0 3.020.0 3.020.0 3.020.0 Awards Glycerin Propylene Glycol Magnesium Sulfate Magnesium Lactone Urea Preservative 2.03.00.30.255.00.3 balance 2.03.00.30.710.00.3 balance 2.03.00.31.515.00.3 balance 2.03.00.3--0.3 level 2.03.00.3-10.00.3 balance

Raw material name Comparative Example 3 Comparative Example 4 Comparative Example 5 Comparative Example 6 Paid Decamethylcyclopentasiloxanecetyl isooctanate ceresine-cured castor oil liquid paraffin silicone surfactantHLB 8 or less surfactant 20.018.010.0--2.0- 20.018.010.0 --- 2.0 38.0--10.0--2.0 ---- 38.0-2.0 Powder TIO _{2 without} talc silicon coating ZNO without silicone coating 20.0-- 20.0-- -10.0- --10.0 Awards water Remaining amount Remaining amount Remaining amount Remaining amount

Anti-inflammatory experiment

Five hairless mice were used for each group to select the left ear as the control site and the right ear as the test site. Wash the ears of each mouse with ethanol and apply the sample to the right ear once a day for 4 days in an amount of 20 μl / ear. After 1 hour of application, arachidonic acid (2 mg / ear: solvent is ethanol) was applied again. After 1 hour, the anti-inflammatory effect was measured by measuring the thickness of both ears repeatedly with a micro caliper.

sample Mouse Ear Thickness (μm) Before treatment After treatment % Inhibition Control 299 547 - Example 1 287 512 9.27 Example 2 289 497 16.1 Example 3 292 465 29.4 Comparative Example 1 296 530 5.6

Anti-inflammatory effect (%) = (A-B) / A × 100

A: Average swelling value of the control ear (ear thickness after arachidonic acid treatment-thickness of the ear before treatment)

B: Average swelling value of the sample coated group ears (ear thickness after arachidonic acid treatment-ear thickness before treatment)

As shown in Table 3, Examples 1 to 3 to which urea was added were superior to the anti-inflammatory effect compared to Comparative Example 1 without urea.

Degradation degree measurement of urea

The resulting water-in-oil emulsion is placed in water to boil the emulsion completely and left for a day, after which the aqueous solution is filtered and the pH is measured using a pH meter.

PH right after manufacturing After 10 days (50 ℃ thermostat) pH After 20 days (50 ℃ thermostat) pH After 30 days (50 ℃ thermostat) pH After 40 days (50 ℃ thermostat) pH Example 1 6.4 6.6 6.9 6.9 7.0 Example 2 6.2 6.5 6.6 6.5 6.6 Example 3 6.5 6.6 6.5 6.7 6.4 Comparative Example 1 6.4 6.7 7.2 7.7 8.5

In the above results, Examples 1 to 3 contained lactones to inhibit decomposition of urea, so that the pH was maintained in a constant water, but Comparative Example 2, which did not contain lactones, accelerated urea decomposition to increase the pH of the aqueous solution.

Stability evaluation

The sample to be examined is left to stand at 25 ° C. and 50 ° C., respectively, and observed to be separated.

Storage temperature Retention days Example Comparative example One 2 3 3 4 5 6 25 ℃ 10 days later ⊙ ⊙ ⊙ △ × △ × 1 month later ⊙ ⊙ ⊙ × × × × 50 ℃ 10 days later ⊙ ⊙ ⊙ × × × × 1 month later ⊙ ⊙ ⊙ × × × ×

* Evaluation: ⊙ Stable

△ instability

× separation

As shown in Table 5 it can be seen that the Example is stable at room temperature (25 ℃) and 50 ℃ compared to the comparative example.

The cosmetic composition according to the present invention is not only excellent in anti-inflammatory effect by containing a large amount of urea, but also in water-in-oil type solid form, easy to carry and easy to use.

Claims (4)

15 to 40% by weight of oil, 6 to 15% by weight of oil gelling agent, a mixture of a silicone surfactant and a surfactant of HLB 8 or less (mixed weight ratio 2: 1 to 5: 1) 1 to 10 weight based on the total weight of the composition %, 10 to 40% by weight of the sunscreen powder, 5 to 20% by weight, 5 to 20% by weight of urea, 0.25 to 10% by weight of lactone and 5 to 40% by weight of water. The ester oil obtained by condensation of an alcohol having 3 to 16 carbon atoms with a fatty acid having 4 to 20 carbon atoms, and a glycerol having 8 to 20 carbon atoms according to claim 1 A solid cosmetic composition comprising one or more selected from the group consisting of fats and oils, liquid paraffin, isoparaffin and squalane obtained by condensation: Formula 1 Formula 2 Where j represents an integer of 0 to 3, i represents the integer of 1-6. The paraffin wax of 25 to 52 carbon atoms, microcrystalline wax, ozokerite, sericin, canova wax, candelina wax, calcium stearate, calcium palmitate, lithium 2 having an oil gelling agent having a melting point of 50 ° C. or higher. -A solid cosmetic composition which is in the form of one species selected from the group consisting of ethylhexanoate and zinc stearate. The cosmetic composition of claim 1 wherein the silicone surfactant is a compound of Formula 3 or Formula 4: Formula 3 Formula 4 Where p represents 7 to 17, q represents 1 to 100, m represents 1 to 40, n represents 0 to 200, PE is-(C ₂ H ₄ O) _a (C ₃ H ₆ O) _b -H with a molecular weight of 250 to 2000, where a / b is 100/0 to 20/80, d represents 50 to 70, e represents 2 to 5, f represents 8-12.