WO2007078062A1

WO2007078062A1 - Solid formed cosmetic composition for sunscreen

Info

Publication number: WO2007078062A1
Application number: PCT/KR2006/005385
Authority: WO
Inventors: Jung-Il Kim; Hwan-Il Cho; Cheon-Koo Lee; Sun-Kyoo Park; Jong-Seob Han
Original assignee: Lg Household & Health Care Ltd.
Priority date: 2005-12-30
Filing date: 2006-12-11
Publication date: 2007-07-12
Also published as: KR20070071573A; KR100749891B1

Abstract

The present invention relates to a solid cosmetic composition includes an organic sunscreen, an inorganic sunscreen, wax, a non-ion surfactant, oil, silicon polymer, and a pigment for a sunscreen, in which the solid cosmetic composition is highly water-resistant to thereby prevent a reduction in a UV protection effect by sweat or water, is comfortable to wear and has long-wearing characteristics, and can be repeatedly used even after application of make-up.

Description

TITLE OFTHE INVENTION

SOLID FORMED COSMETIC COMPOSITION FOR SUNSCREEN

BACKGROUND OFTHE INVENTION (a) Field of the Invention

The present invention relates to a solid cosmetic composition for a sunscreen. More particularly, the present invention relates to a solid cosmetic composition for a sunscreen, in which the solid cosmetic composition is highly water-resistant to thereby prevent a reduction in a UV protection effect by sweat or water, is comfortable to wear and has long- wearing characteristics, and can be repeatedly used even after application of make-up. (b) Description of the Related Art

Ultraviolet rays radiated from the sun are the main cause of erythemas, edemas, freckles, and skin cancer. Therefore, in recent years, there has been much research on skin diseases caused by ultraviolet rays.

Ultraviolet rays are generally classified according to wavelength into ultraviolet-C (hereinafter, referred to as "UV-C") having a wavelength of 200-290nm, ultraviolet-B (hereinafter, referred to as "UV-B") having a wavelength of 290-320nm, and ultraviolet-A (hereinafter, referred to as "UV-A") having a wavelength of 320- 400nm. UV-C disappears while passing through the ozone layer and thus cannot reach the surface of the earth. UV-B penetrates the outer skin to thereby cause the erythemas, edemas, freckles, and skin cancer. UV-A penetrates the inner skin to thereby cause skin cancer, fast aging of the skin, and irritation of the skin, such as wrinkles and the formation of melanin. Health hazards caused by exposure to the sun are well known, resulting in an ever-increasing awareness of sunscreen products. Therefore, many different sunscreen products having a variety of sun protection factors (SPF) and a variety of protection grades of UV-A (PA) have been released.

Generally, the formulations of sunscreen products are classified into water- in-oil (W/O) types of formulations and oil-in-water (O/W) types of formulations. The W/O-type sunscreen product provides for superior wear comfort but a low level of water resistance. Therefore, such a sunscreen product is easily wiped away by water or sweat after being applied on the skin, thereby resulting in deterioration in the UV protection effect. The 0/W-type sunscreen product is highly water-resistant but provides for inferior wear comfort, hi addition, since the W/O-type sunscreen product cannot be repeatedly applied to the skin after application of make-up, it cannot provide for a long-lasting UV protection effect.

In order to have a relatively high SPF, sunscreen products generally use an inorganic sunscreen such as titanium dioxide, zinc oxide, and/or iron oxide, or an organic sunscreen such as octyl methoxycinnamate, octyl salicylate, octocrylene, octocrylene, butyl methoxydibenzoyl methane, octyl triazone, Menthyl anthranilate, and/or 3,4-methylbenzylidene camphor. However, when the inorganic sunscreen is used for the sunscreen product, an undesirable white cloudy look results. When the organic sunscreen is used for the sunscreen product, on the other hand, the skin to which the sunscreen product is applied becomes shiny, and a heavy wear feeling results.

Therefore, there is a limitation to a certain extent in improving wear comfort when the sunscreen product has a relatively high SPF and PA. Therefore, research for solving this problem has been conducted. For example, Korean Laid-open Patent No. 2000-0015146 proposes a cosmetic composition for a sunscreen having a silica carrier containing titanium oxide. However, the cosmetic composition disclosed in Korean Laid-open Patent No. 2000-0015146 is designed for blocking only UV-B. Therefore, this conventional cosmetic composition still encounters deterioration in wear comfort in order to improve the UV-A protection effect.

SUMMARY OF THE INVENTION

In order to solve the problems of the prior art described hereinabove, the present invention provides a solid cosmetic composition for a sunscreen, in which the solid cosmetic composition that provides for an excellent UV protection effect is comfortable to wear, is highly water-resistant, has excellent long-wearing characteristics, is convenient in use, and can be repeatedly used even after application of make-up.

In an exemplary embodiment of the present invention, a solid cosmetic composition for a sunscreen includes 1-20% by weight of an organic sunscreen, 1-

40% by weight of an inorganic sunscreen, 3-10% by weight of a wax ingredient, 1-

10% by weight of a non-ion surfactant, 10-60% by weight of an oil ingredient, 1-

40% by weight of silicon polymer, and 1-30% by weight of a pigment.

DETAILED DESCRIPTION OFTHE EMBODIMENTS

Embodiments of the present invention will now be described in more detail. The inventors of the present invention conceived of the present invention after determining, during research on a cosmetic composition for a sunscreen, that when an organic sunscreen, an inorganic sunscreen, a wax ingredient, a non-ion surfactant, an oil ingredient, and silicon polymer are used in proper proportions, an excellent UV protection effect, good wear comfort, good water resistance, and excellent long-wearing characteristics can be realized, and repeated use is made possible even after application of make-up.

A cosmetic composition for a sunscreen according to an exemplary embodiment of the present invention includes an organic sunscreen, an inorganic sunscreen, wax, a non-ion surfactant, oil, silicon polymer, and a pigment.

Formulation of the cosmetic composition of the sunscreen according to the exemplary embodiment of the present invention is a solid-phase. That is, the cosmetic composition has an elastic gel matrix structure where the silicon polymer acts as a structural connector having flexibility in a matrix formed by powder (the organic and inorganic sunscreens) and the oil/wax ingredient.

That is, in the elastic gel matrix structure, since the silicon polymer functions as the structural connector providing elastic force, physical property variations of the cosmetic material, which are caused by a change in temperature, are minimized, as is a cracking phenomenon caused when the cosmetic material is kept at a low temperature or in a cycle chamber. The oil ingredient in the elastic gel matrix structure prevents sweat generated on skin from moving to an outer surface of the skin to thereby improve a sweating phenomenon, and reduces a friction coefficient to thereby improve spreading characteristics. In the cosmetic composition according to the exemplary embodiment of the present invention, the organic sunscreen may be selected from the group consisting of octyl methoxycinnamate, octyl salicylate, octocrylene, butyl methoxydibenzoyl methane, oxybenzone, octyl triazone, menthyl anthranilate, 3,4-methylbenzylidene camphor, bis-ethylhexyl oxyphenol methoxyphenyl triazine, and a combination thereof.

The cosmetic composition may include 1-20% by weight of the organic sunscreen. That is, the content of the organic sunscreen may be 1% by weight or more to maintain sun protection strength, but 20% by weight or less to prevent deterioration in wear comfort. The inorganic sunscreen may be selected from the group consisting of titanium dioxide having a mean grain size of 0.01-100 nm, zinc oxide having a mean grain size of 0.01-300 nm, iron oxide having a mean grain size of 1-300 nm, and a combination thereof.

The cosmetic composition may include 1-40% by weight of the inorganic sunscreen. That is, the content of the inorganic sunscreen may be 1% by weight or more to maintain sun protection strength, but 40% by weight or less to prevent deterioration in wear comfort.

The wax ingredient may be selected from the group consisting of vegetable wax such as candelilla wax, carnaub wax, or rice wax, animal wax such as bees wax or lanolin, mineral wax such as ozokerite or ceresin wax, petroleum wax such as paraffin wax, microcrystal wax, or polyethylene wax, a wax combination including ethylene/propylene copolymer and synthetic wax, and a combination thereof.

The cosmetic composition may include 3-10% by weight of the wax ingredient. That is, the content of the wax ingredient may be 3% by weight or more in order to realize high temperature stability, but 10% by weight or less to prevent deterioration in wear comfort.

The non-ion surfactant may be an oil-soluble non-ion surfactant so as to improve formulation stability. That is, the non-ion surfactant may be selected from the group consisting of glyceryl stearate, sorbitan sesquistearate, sorbitan stearate, PEG-10, dimethicone, sorbitan oleate, and a combination thereof.

The cosmetic composition may include 1-10% by weight of the non-ion surfactant. That is, the content of the non-ion surfactant may be 1% by weight or more to provide for formulation stability, but 10% by weight or less to prevent deterioration in wear comfort.

The oil ingredient is not limited to a specific material. Any typical oil used in a cosmetic composition may be used. For example, the oil ingredient may be selected from the group consisting of hydrocarbon-based oil such as hydrogenated polydecene, squalane, or mineral oil, ester-based oil such as caprylic/caplic triglyceride, neopentyl glycol dicaprate, 2-octyldodecyl myristate, cetyl 2- ethylhexanoate, octyldodecanol, or glyceryl triethylhexanoate, vegetable oil such as olive oil, jojoba oil, or macadamia oil, silicon oil such as cyclomethicone or dimethicone, and a combination thereof.

The cosmetic composition may include 10-60% by weight of the oil ingredient. That is, the content of the oil ingredient may be 10% by weight or more to provide for formulation stability, but 60% by weight or less to prevent deterioration in wear comfort.

The silicon polymer may be selected from the group consisting of dimethicone/dimethicone PEG-10/15, dimethicone/polyglycerin-3, dimethicone/ dimethiconol, dimethicone/dimethicone vinyldimethicone, cyclodimethicone/ dimethiconol, cyclomethicone/dimethicone, cyclomethicone/trimethylsiloxysilicate, cyclopentasiloxane/dimethicone, cyclopentasiloxane/PEG- 12 dimethicone, cyclopentasiloxane/cetearyl dimethicone/vinyl dimethicone, cyclopentasiloxane/dimethicone/vinyl dimethicone, and a combination thereof. The cosmetic composition may include 1-40% by weight of the silicon polymer. That is, the content of the silicon polymer may be 1% by weight or more to provide for formulation stability, but 40% by weight or less to prevent deterioration in wear comfort. The pigment may be selected from the group consisting of clay minerals pigment such as iron oxide, alumina, talc, mica, kaolin, silicic acid barium, zeolite, muscovite, synthetic muscovite, or magnesium carbonate, inorganic pigment such as barium sulfate, titanium iron oxide, or titanium oxide coated mica, and organic pigment such as polystyrene powder, polyethylene powder, polymethylmethacrylate powder, nylon powder, or silicon powder, and a combination thereof.

The cosmetic composition may include 1-30% by weight of the pigment. That is, the content of the pigment may be 1% by weight or more to provide for proper oil absorption ability for the oil-feeling and sebum, but 30% by weight or less to prevent deterioration in the forming property and the spreading property. In addition, it is desirable that for the pigment of the cosmetic composition, a pigment that is hydrophobic-treated is used. That is, a surface of the powder pigment may be treated using high viscosity silicon, alkyl hydrogen polysiloxane, cation surfactant, anion surfactant, non-ion surfactant, or wax.

The above-described cosmetic composition for the sunscreen according to this embodiment is a solid-phase. This cosmetic composition may have a hardness of 300-1200 dyne/cm², SPF of 30-80, and a PA of triple plus (PA+++).

That is, the cosmetic composition of this embodiment provides for good wear comfort as it is less sticky and greasy and repeatedly applied even after the application of make-up, while having a relatively high SPF and PA as compared with a conventional cream-type cosmetic composition for a sunscreen having the hardness of 20-30 dyne/cm². Further, the cosmetic composition of the present invention has a good make-up base effect and good water resistance, and may be applied to the skin using a puff to thereby improve application convenience. Furthermore, the cosmetic composition of this embodiment provides for good long-wearing stability and ensures skin safety. The following will describe exemplary embodiments of the present invention and comparative examples.

Although exemplary embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes may be made in this embodiment without departing from the principles and spirit of the invention, the scope of which is defined in the claims and their equivalents.

Examples 1 and 2

The following ingredients were mixed in proportions shown in Table 1, and dissolved while being heated at 80 "C . (Ingredients)

- Organic Sunscreen: Octyl Methoxycinnamate and

Bis-ethylhexyl Oxyphenol Methoxyphenyl Triazine;

- Wax Ingredient: Ceresin Wax;

- Non-ion Surfactant: PEG-10 Dimethicone; - Oil Ingredient: Dimethicone and Glyceryl Triethylhexanoate;

- Silicon Polymer: Cyclomethicone/trimethylsiloxysilicate and

Dimethicone/dimethicone Vinyldimethicone Crosspolymer; and

- Preservative: Methylparaben

Subsequently, the inorganic sunscreen (titanium dioxide and zinc oxide) and the pigment (silica powder or nylon powder) were added to the dissolved mixture and uniformly dispersed. Next, this composition was de-aired using a vacuum pump, filled in a mold, and cooled at 25 ^°C to thereby provide a solid composition. [Table 1]

Comparative Examples 1 and 2

Water-phase ingredients were mixed in proportions shown in Table 2, dissolved at 75 ^°C , and dispersed. Oil-phase ingredients were mixed in proportions shown in Table 2, dissolved at 75 ^°C , and dispersed. Next, the water-phase mixture was slowly added to the oil-phase mixture to prepare an O/W emulsion having a hardness of 28dyne/cm (Comparative Example 1). The oil-phase mixture was slowly added to the water-phase mixture to prepare a W/O emulsion having a hardness of 30dyne/cm² (Comparative Example 2). [Table 2]

Tests The SPF and PA for the compositions prepared according to the Examples 1 and 2 and Comparative Examples 1 and 2 were measured, and the wear comfort, formulation stability, and skin safety were evaluated. The following will describe an evaluation method and an evaluation result.

Test Example 1 : Measurement of SPF

The SPF for the compositions prepared according to the Examples 1 and 2 and Comparative Examples 1 and 2 were measured in accordance with the "Sun Protection Performance Test Method" of the "Functional Cosmetics Standard and Test Method" standardized by the Korea Food and Drug Administration (KFDA). The compositions were applied to respective transpore tapes to have a thickness of 2mg/cm², dried for 15 minutes, and measured using an SPF 290 analyzer. The SPF is a mean value of three test values, and the result is shown in Table 3. [Table 3]

Test Example 2: Measurement of PA This test was conducted according to Article 9 of the cosmetics law and

Article 6 of the regulation of the cosmetics law. The test also was conducted on 10 or more able-bodied men and women between the ages of 18 and 60. A multi-port solar simulator 601-300W (Solar Light Company, USA) equipped with a 300W xenon arc lamp was used as a light source. A 3D UV meter (Solar Light Company, USA) was used to measure the light intensity. The test result showed that all of the compositions of the Examples 1 and 2 and Comparative Examples 1 and 2 have a PA above PA+++.

Test Example 3: Evaluation of Wear Comport

The sticky and greasy properties, make-up base effect, formulation preference, application convenience, and general satisfaction for the compositions prepared according to the Examples 1 and 2 and Comparative Examples 1 and 2 were evaluated on 10 or more women between the ages of 25 and 45. The solid compositions prepared according to the Examples 1 and 2 were applied on faces of subjects using a puff. The emulsion compositions prepared according to the Comparative Examples 1 and 2 were applied on faces of subjects using hands. The result is shown in Table 4.

(Evaluation Reference)

1: Very Bad, 2: Bad, 3: Average, 4: Good, 5: Very good [Table 4]

As shown in Table 4, the solid cosmetic compositions for sunscreen prepared according to the Examples of the present invention were superior in the sticky and greasy properties, make-up base effect, formulation preference, application convenience, and general satisfaction to the O/W emulsion composition prepared according to the Comparative Example 1 and the W/O emulsion composition prepared according to the Comparative Example 2. Test Example 4: Evaluation of Formulation Stability After the compositions prepared according to the Examples 1 and 2 and

Comparative Examples 1 and 2 were neglected for 2 months under the temperature conditions of -15 ^°C, 0^°C, 25 ^°C, 40 ^°C, 45 "C, and 50 ^°C, a separation phenomenon caused by the floating of the oil was evaluated using naked eyes.

(Evaluation Reference) O: the separation phenomenon does not occur (Good)

X: the separation phenomenon occurs [Table 5]

As shown in Table 5, the compositions prepared according to the Examples of the present invention were superior in the formulation stability to the compositions prepared according to the Comparative Examples 1 and 2. Test Example 4: Evaluation of Skin-safety

A patch test was performed for 24 hours after attaching a test patch on each arm of 30 able-bodied men and women.

That is, a predetermined amount (15mg/15ul) of test sample was applied on pin chambers and the pin chambers are attached on arms of the respective subjects using tapes. Subsequently, the test patches were removed from the arms after 24 hours lapsed. Next, after four hours lapsed, symptoms (whether the erythema appears) appeared on the skins of the subjects were observed and classified as shown in Table 7.

Primary irritation indexes (PII) were calculated using scores, which are obtained in accordance with a determination reference, according to the following equation.

[Equation]

PII = ((Degree of Skin Irritation) X (The Number of Subjects reacting to the patch))/Total Number of Subjects [Table 6]

[Table 7J

Comparative Comparative

Example 1 Examples 2 Example 1 Example 2

PII 0.02 0.04 0.12 0.14 As shown in Table 7, the compositions prepared according to the Examples of the present invention were superior in the skin-safety to the compositions prepared according to the Comparative Examples 1 and 2.

As described above, the solid cosmetic composition for the sunscreen according to the present invention provides for good wear comfort as it is less sticky and greasy and repeatedly applied even after the application of make-up, while having a relatively high SPF and PA. Further, the solid cosmetic composition of the present invention has a good make-up base effect and good water resistance, and may be applied to the skin using a puff to thereby improve application convenience. Furthermore, the solid cosmetic composition of the present invention provides for good long-wearing stability and ensures skin safety.

Although Examples of the present invention have been described in detail hereinabove, it should be clearly understood that many variations and/or modifications of the basic inventive concept taught herein still fall within the spirit and scope of the present invention, as defined by the appended claims and their equivalents.

Claims

WHAT IS CLAIMED IS:

1. A solid cosmetic composition for a sunscreen, comprising:

1-20% by weight of an organic sunscreen; 1-40% by weight of an inorganic sunscreen; 3-10% by weight of a wax ingredient; 1-10% by weight of a non-ion surfactant; 10-60% by weight of an oil ingredient; 1-40% by weight of silicon polymer; and 1-30% by weight of a pigment.

2. The solid cosmetic composition of claim 1, wherein the composition has a hardness of 300-1200 dyne/cm².

3. The solid cosmetic composition of claim 1, wherein the composition has an SPF (Sun Protection Factor) of 30-80 and a PA (Protection Grades of ultraviolet- A (UV-A)) of PA+++.

4. The solid cosmetic composition of claim 1, wherein the organic sunscreen is selected from the group consisting of octyl methoxycinnamate, octyl salicylate, octocrylene, butyl methoxydibenzoyl methane, oxybenzone, octyl triazone, menthyl anthranilate, 3,4-methylbenzylidene camphor, bis-ethylhexyl oxyphenol methoxyphenyl triazine, and a combination thereof.

5. The solid cosmetic composition of claim 1, wherein the inorganic sunscreen is selected from the group consisting of titanium dioxide, zinc oxide, iron oxide, and a combination thereof.

6. The solid cosmetic composition of claim 1, wherein the wax ingredient is selected from the group consisting of: vegetable wax selected from the group consisting of candelilla wax, carnaub wax, rice wax, and a combination thereof; animal wax selected from the group consisting of bees wax, lanolin, and a combination thereof; mineral wax selected from the group consisting of ozokerite, ceresin wax, and a combination thereof; petroleum wax selected from the group consisting of paraffin wax, microcrystal wax, polyethylene wax, and a combination thereof; a wax combination including ethylene/propylene copolymer and synthetic wax; and a combination thereof.

7. The solid cosmetic composition of claim 1, wherein the non-ion surfactant is selected from the group consisting of glyceryl stearate, sorbitan sesquistearate, sorbitan stearate, PEG-10, dimethicone, sorbitan oleate, and a combination thereof.

8. The solid cosmetic composition of claim 1, wherein the oil ingredient is selected from the group consisting of: hydrocarbon-based oil selected from the group consisting of hydrogenated polydecene, squalene, mineral oil, and a combination thereof; ester-based oil selected from the group consisting of caprylic/caplic triglyceride neopentyl glycol dicaprate, 2-octyldodecyl myristate, cetyl 2- ethylhexanoate, octyldodecanol, glyceryl triethylhexanoate, and a combination thereof; vegetable oil selected from the group consisting of olive oil, jojoba oil, macadamia oil, and a combination thereof; silicon oil selected from the group consisting of cyclomethicone, dimethicone, and a combination thereof; and a combination thereof.

9. The solid cosmetic composition of claim 1, wherein the silicon polymer is selected from the group consisting of dimethicone/dimethicone PEG- 10/15, dimethicone/polyglycerin-3, dimethicone/ dimethiconol, dimethicone/dimethicone vinyldimethicone, cyclodimethicone/ dimethiconol, cyclomethicone/dimethicone, cyclomethicone/trimethylsiloxysilicate, cyclopentasiloxane/dimethicone, cyclopentasiloxane/PEG- 12 dimethicone, cyclopentasiloxane/cetearyl dimethicone/vinyl dimethicone, cyclopentasiloxane/dimethicone/vinyl dimethicone, and a combination thereof.

10. The solid cosmetic composition of claim 1, wherein the pigment is selected from the group consisting of: a clay mineral pigment selected from the group consisting of iron oxide, alumina, talc, mica, kaolin, silicic acid barium, zeolite, muscovite, synthetic muscovite, magnesium carbonate, and a combination thereof; an inorganic pigment selected from the group consisting of barium sulfate, titanium iron oxide, titanium oxide coated mica, and a combination thereof; an organic pigment selected from the group consisting of polystyrene powder, polyethylene powder, polymethylmethacrylate powder, nylon powder, silicon powder, and a combination thereof; and a combination thereof.

11. A cosmetics product for sun protection comprising a solid cosmetic composition claimed in any one of claims 1 through 10 and a puff.