JP7709828B2 - Oil-in-water sunscreen cosmetics - Google Patents

Description

The present invention relates to an oil-in-water sunscreen cosmetic, and more specifically, to an oil-in-water sunscreen cosmetic that has good UV protection properties, does not feel squeaky when applied, has excellent feel when used such as affinity with the skin, and is stable over time.

In recent years, the number of oil-in-water sunscreen cosmetics has increased due to their pleasant feel when used. However, when a large amount of UV absorber is added, some people may feel irritation, or the product may become sticky or squeaky (see, for example, Patent Document 1).

Patent Publication 2007-246454

The object of the present invention is to solve the above problems, specifically to provide an oil-in-water type sunscreen cosmetic that has good UV protection properties, does not feel squeaky when applied, has excellent feel when used such as affinity with the skin, and is stable over time.

As a result of extensive research, the inventors discovered that an oil-in-water emulsion cosmetic that can solve the above problems can be obtained by combining and blending a higher fatty acid salt, a surfactant other than a higher fatty acid salt, an ultraviolet absorber, and a paste-like oil, and thus completed the present invention.

That is, the first invention of the present application is an oil-in-water sunscreen cosmetic composition characterized by containing the following components (A) to (D):
(A) 0.5% by mass or more of higher fatty acid salt; (B) 0.5% by mass or more of surfactant other than component (A); (C) Organic ultraviolet absorber; (D) Oil other than component (C);

Preferably, the component (B) is an oil-in-water sunscreen cosmetic that contains one or more surfactants selected from alkyl sulfate ester salts, fatty acid monoglyceryl, polyoxyalkylene alkyl ether type nonionic surfactants, and fatty acid polyethylene glycol type nonionic surfactants.

More preferably, the component (D) is an oil agent that is a paste (semi-solid) at 25°C, and is an oil-in-water sunscreen cosmetic that contains one or two selected from petrolatum and dimer dilinoleate (phytostearyl/isostearyl/cetyl/stearyl/behenyl).

The oil-in-water sunscreen cosmetic of the present invention has good UV protection properties, but does not feel squeaky when applied, has excellent feel when used, such as affinity with the skin, and is stable over time.

The oil-in-water sunscreen cosmetic of the present invention will be described in detail below.

In this specification, "squeaky feeling" means that the product feels like it is catching on the skin when applied, and "skin compatibility" means that the product has a moderate moist feeling without feeling sticky. In addition, "stability over time" means that the product remains in an emulsified state without discoloration, odor, or separation for one month at 50°C.

The oil-in-water sunscreen cosmetic composition of the present invention contains the following components.
(A) 0.5% by mass or more of higher fatty acid salt; (B) 0.5% by mass or more of surfactant other than component (A); (C) Organic ultraviolet absorber; (D) Oil other than component (C);

<(A) Higher fatty acid salt>
The component (A) used in the present invention is a higher fatty acid salt. The higher fatty acid salt is used to reduce the squeaky feeling and improve compatibility with the skin.

The higher fatty acid is preferably one having 12 to 22 carbon atoms from the viewpoint of compatibility with the skin and stability over time, and more preferably one having 12 to 18 carbon atoms. Specific examples include lauric acid, tridecylic acid, myristic acid, pentadecylic acid, palmitic acid, margaric acid, stearic acid, arachic acid, behenic acid, isocaprylic acid, isopelargonic acid, isocapric acid, isoundaconic acid, isolauric acid, isotridecylic acid, isomyristic acid, isopentadecylic acid, isopalmitic acid, isomargaric acid, isostearic acid, isononadecanoic acid, isoarachic acid, isoheneicosanoic acid, and isobehenic acid.

Examples of salts of higher fatty acids include alkali metal salts such as sodium salts and potassium salts; alkanolamine salts such as monoethanolamine salts, diethanolamine salts, and triethanolamine salts; and the like.

The blending amount of component (A) is 0.5% by mass or more, and preferably 5.0% by mass or less, based on the mass of the oil-in-water sunscreen cosmetic. If it is 0.5% by mass or more, the emulsion stability is improved, and if it is 5.0% by mass or less, the feel during use is good.

<(B) Surfactant other than component (A)>
The component (B) used in the present invention is a surfactant other than the component (A). The component (B) is used in combination with the component (A) to improve stability over time.

Examples of component (B) include alkyl sulfate ester salts, fatty acid monoglyceryl, polyoxyalkylene alkyl ether type nonionic surfactants, and fatty acid polyethylene glycol type nonionic surfactants.

The blending amount of component (B) is 0.5% by mass or more, and preferably 10% by mass or less, based on the mass of the oil-in-water sunscreen cosmetic. If it is 0.5% by mass or more, the emulsion stability is good, and if it is 10% by mass or less, the product is less likely to feel sticky.

<(C) Organic UV absorber>
The component (C) used in the present invention is an organic ultraviolet absorber, which may be either liquid or solid. The component (C) is used to protect the skin from sunburn and the quality of cosmetics from harmful ultraviolet rays.

Examples of liquid organic ultraviolet absorbers include 2-ethylhexyl paramethoxycinnamate, 2-ethoxyethyl paramethoxycinnamate, a mixture of isopropyl paramethoxycinnamate and diisopropyl cinnamate, methyl bis(trimethylsiloxy)silylisopentyl trimethoxycinnamate, amyl paradimethylamino acid benzoate, 2-ethylhexyl paradimethylamino acid benzoate, ethylene glycol salicylate, 2-ethylhexyl salicylate, benzyl salicylate, homomenthyl salicylate, octocrylene, dimethyldiethylbenzalmalonate, etc. Among these, 2-ethylhexyl paramethoxycinnamate, 2-ethylhexyl salicylate, homomenthyl salicylate, octocrylene, dimethyldiethylbenzalmalonate are preferred, 2-ethylhexyl paramethoxycinnamate, octocrylene, dimethyldiethylbenzalmalonate are more preferred, and 2-ethylhexyl paramethoxycinnamate is even more preferred. The liquid organic ultraviolet absorbents may be contained alone or in appropriate combination of two or more kinds.

Solid organic UV absorbers include 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid hexyl ester, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, 4-tert-butyl-4'-methoxydibenzoylmethane, and 2-ethylhexyl dimethoxybenzylidene dioxoimidazolidinepropionate. The solid organic UV absorbers can be contained alone or in appropriate combination of two or more kinds.

Of these, 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid hexyl ester, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine, and 4-tert-butyl-4'-methoxydibenzoylmethane are preferred, and 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid hexyl ester, 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine, and 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine are more preferred. In addition, the solid organic UV absorber in the present invention is considered to be present in a liquid state in the cosmetic composition.

Commercially available examples of these ingredients include Uvinal MC80 (2-ethylhexyl paramethoxycinnamate; manufactured by BASF), Uvinal Aplus Examples include Glanular (2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid hexyl ester; manufactured by BASF), TINOSORBS (2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine; manufactured by BASF), Ubinal T-150 (2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine; manufactured by BASF), Soft Shade DH (dimethoxybenzylidene dioxoimidazolidinepropionate 2-ethylhexyl; manufactured by Ajinomoto Co.), and PARSOL1789 (4-tert-butyl-4'-methoxydibenzoylmethane; manufactured by DSM).

The blending amount of component (C) is preferably 1 to 30% by mass, and more preferably 5 to 20% by mass or less, based on the mass of the oil-in-water sunscreen cosmetic. If it is 1% by mass or more, a certain level of UV protection effect can be obtained, and if it is 30% by mass or less, a good feel can be obtained without stickiness.

<(D) Oil other than components (C)>
The component (D) used in the present invention is an oil other than the component (C). The component (D) is used to improve compatibility with the skin.

Examples of oils other than component (C) include liquid oils and oils that are paste-like (semi-solid) at 25°C. Oils that are paste-like (semi-solid) at 25°C are particularly preferred, such as petrolatum and dimer dilinoleate di(phytostearyl/isostearyl/cetyl/stearyl/behenyl).

The blending amount of component (D) is preferably 0.1 to 10% by mass relative to the mass of the oil-in-water sunscreen cosmetic. If it is 0.1% by mass or more, the feel during use is good, and if it is 10% by mass or less, it is not sticky.

<Other ingredients>
The oil-in-water sunscreen cosmetic of the present invention contains the above-mentioned components as essential constituents, but the composition can also contain other components, such as anionic surfactants, amphoteric surfactants, nonionic surfactants, oils, polymeric compounds, thickeners, powders (colorants, resins, pigments), preservatives, fragrances, moisturizers, physiologically active ingredients, salts, solvents, antioxidants, chelating agents, pearlizing agents, neutralizing agents, pH adjusters, insect repellents, enzymes, and other components, as appropriate, provided such components do not impair the object of the present invention.

The oil-in-water sunscreen cosmetic of the present invention may also contain a suitable amount of physiologically active ingredients, provided that the purpose of the present invention is not impaired. A physiologically active substance is a substance that imparts some kind of physiological activity to the skin when applied to the skin, and examples of such substances include anti-aging agents, tightening agents, antioxidants, moisturizing agents, blood circulation promoters, antibacterial agents, disinfectants, drying agents, cooling agents, warming agents, vitamins, amino acids, wound healing promoters, irritation mitigators, analgesics, cell activators, enzyme components, etc.

The physiologically active ingredient that can be incorporated into the skin cosmetic of the present invention is not particularly limited in type, but it is preferable to use an extract derived from the roots, stems, leaves, flowers, fruits, or seeds of a plant. Examples of extracts derived from the roots, stems, leaves, flowers, fruits, or seeds of a plant include angelica extract, avocado extract, amacha extract, althea extract, arnica extract, aloe extract, knotweed extract, fennel extract, star anise extract, barley extract, hypericum extract, persimmon extract, pueraria root extract, chamomile extract, carrot extract, licorice extract, raspberry extract, kiwi extract, cucumber extract, apricot kernel extract, quince seed extract, brown sugar extract, rice bran extract, fermented rice bran extract, sugar maple extract, and sugar cane extract. , perilla extract, peony extract, honeysuckle extract, St. John's wort extract, hawthorn extract, elderberry extract, sage extract, soybean extract, thyme extract, tea extract, camellia extract, centella extract, houttuynia extract, tomato extract, wild rose extract, witch hazel water, rose extract, parietaria extract, loquat extract, grape extract, loofah extract, peony extract, hop extract, soapberry extract, peach leaf extract, cornflower extract, coix seed extract, lemon extract, rosemary extract, Roman chamomile extract, etc.

The present invention will be specifically explained below by illustrating examples and comparative examples, but the present invention is not limited to these examples in any way. Prior to the examples, the test methods and evaluation methods used in each example will be explained.

<UV protection ability>
(Evaluation Method)
The SPF was evaluated by the following in vitro SPF measurement.
The coating method was in accordance with ISO 24443, and each sample shown in the Examples and Comparative Examples was coated on a PMMA plate, and then the sample was dried for 30 minutes, after which the SPF was measured using an SPF analyzer (UV-2000S, manufactured by Labsphere). For each sample, the average value of nine points was calculated, and the results were evaluated according to the following criteria.
<Evaluation criteria>
◎: (average SPF value) = 30 or more
○: (average SPF value) = 20 or more and less than 30
△: (average SPF value) = 10 or more and less than 20
×: (average SPF value) = less than 10

<Evaluation test for lack of creaking sensation when fitting>
(Evaluation Method)
Five expert panelists applied the oil-in-water sunscreen cosmetic of the present invention to the inside of the forearm and lightly blended it with their fingers, and evaluated "the absence of a squeaky feeling when blended in." The test results were judged according to the following evaluation criteria using the number of people who answered "there was no squeaky feeling when blended in."
<Evaluation criteria>
◎: 4 or 5 panelists recognized that there was no creaking sensation when familiarized. ○: 2 or 3 panelists recognized that there was no creaking sensation when familiarized. △: 1 panelist recognized that there was no creaking sensation when familiarized. ×: 0 panelists recognized that there was no creaking sensation when familiarized.

<Skin compatibility evaluation test>
(Evaluation Method)
Five expert panelists applied the oil-in-water sunscreen cosmetic of the present invention to the inside of their forearms, lightly blended it with their fingers, and one minute later evaluated the "skin compatibility." The test results were evaluated according to the following evaluation criteria, using the number of people who answered "not sticky when applied and compatible with the skin."<EvaluationCriteria>
◎: Four or five panelists recognized that the product was not sticky when applied and blended well with the skin. ○: Two or three panelists recognized that the product was not sticky when applied and blended well with the skin. △: One panelist recognized that the product was not sticky when applied and blended well with the skin. ×: Zero panelists recognized that the product was not sticky when applied and blended well with the skin.

<Evaluation test of stability over time>
After leaving the sample in a thermostatic chamber at 50° C. for one month, the appearance of the sample was checked and evaluated according to the following criteria.
<Evaluation criteria>
◎: No changes such as discoloration or odor were observed. ○: Some changes were observed, but there was no problem with stability. △: Some changes were observed, but no oil floating or separation occurred. ×: Separation

As is clear from Table 1, all of the oil-in-water sunscreen cosmetics of the examples using the components of the present invention had excellent performance. On the other hand, the comparative examples lacking any of the essential components were inferior in terms of UV protection ability, lack of squeaky feeling when applied or blended into the skin, and blended into the skin, and did not achieve the object of the present invention.

Other formulation examples of the skin cosmetic of the present invention are given below. The oil-in-water sunscreen cosmetic of the formulation example below was also examined in terms of the above-mentioned UV protection ability, the lack of squeaky feeling when applied and blended, and the goodness of blending with the skin. All of these were found to have excellent properties similar to those of the Examples, and were good.

Formulation Example 1 Oil-in-water sunscreen cosmetic (1) Stearic acid 4.0%
(2) Glyceryl stearate 5.0%
(3) Potassium hydroxide 0.3%
(4) 2-ethylhexyl p-methoxycinnamate 12.0%
(5) 2-(4-diethylamino-2-hydroxybenzoyl)benzoic acid hexyl ester 2.0%
(6) 2,4,6-tris[4-(2-ethylhexyloxycarbonyl)anilino]-1,3,5-triazine 2.0%
(7) 2,4-bis{[4-(2-ethylhexyloxy)-2-hydroxy]phenyl}-6-(4-methoxyphenyl)-1,3,5-triazine 2.0%
(8) Vaseline 3.0%
(9) Cetearyl alcohol 4.0%
(10)BG 7.0%
(11) Octyldodecyl myristate 5.0%
(12) Isononyl isononanoate 1.0%
(13) Dimethylpolysiloxane 1.0%
(14) Hydrogenated lecithin 0.8%
(15) Phytosterol 0.08%
(16) Tocopherol 0.1%
(17) Ethanol 8.0%
(18) Sodium hyaluronate 0.2%
(19) edetate disodium 0.01%
(20) Purified water remainder

(Production method) (1), (2), (4), (5) to (9), and (11) to (16) were heated to 80°C and uniformly dissolved (Liquid A). (3), (10), (19), and (20) were heated to 80°C and uniformly dissolved (Liquid B). Liquid B was added to Liquid A and uniformly dispersed using a homomixer, after which (17) and (18) were added and further uniformly dispersed using a homomixer to prepare a sunscreen O/W gel cream.

Claims (1)

An oil-in-water type sunscreen cosmetic composition comprising the following components (A) to (D):
(A) 0.5% by mass or more of a higher fatty acid salt; (B) 0.5% by mass or more of a combination of glyceryl stearate and ceteth-15, which is a surfactant other than component (A); (C) an organic ultraviolet absorber; (D) an oil solution which is a paste (semi-solid) at 25°C and which contains one or two types selected from petrolatum and dimer dilinoleate (phytostearyl/isostearyl/cetyl/stearyl/behenyl).