JP7118692B2 - Oil-in-water cosmetic composition - Google Patents

Description

TECHNICAL FIELD The present invention relates to an oil-in-water cosmetic composition, and more particularly, an oil-in-water cosmetic composition that has high safety and a fresh feeling in use, as well as high water resistance, detergency, and formulation stability. about things.

In general, oil-in-water cosmetics have an aqueous phase as an external phase, so that they spread well and easily provide a fresh feeling when used, but have a feature of less clogging feeling due to oil. On the other hand, water-in-oil type cosmetics tend to spread slowly because the external phase is an oil phase, but they are known to have effects such as providing an emollient feeling unique to oil and imparting water resistance due to the oil film. there is These dosage forms are used properly according to the feeling of use and effect desired, and are applied in many cosmetics.

On the other hand, protecting the skin from damage by ultraviolet rays is one of the important issues in skin care. Various studies have been made to minimize the adverse effects of ultraviolet rays on the skin. For example, there is a report on a method of protecting the skin from damage caused by ultraviolet rays by covering the skin with a coating film containing an ultraviolet absorber or an ultraviolet scattering agent (Non-Patent Document 1).

In order to achieve a high SPF (Sun Protection Factor) value in an oil-in-water emulsion system, it is necessary to blend a large amount of an oil-soluble UV absorber or UV scattering agent. When these are highly blended, not only does the fresh feel characteristic of oil-in-water emulsified systems be lost, but also stickiness and squeakiness occur, resulting in poor feel during use.

If the UV absorber is used in a large amount, it causes skin irritation, which poses a problem of safety, and causes stickiness and a bad feeling in use. (Patent Document 1) On the other hand, UV scattering agents are said to be safer than UV absorbers. (Patent Document 2) However, the UV scattering agent has a poor feel when used, and many problems arise in terms of feel during use, such as a squeaky feeling, whiteness when applied, and stickiness. There is no mention of feeling, and it cannot be said that the task was accomplished.

In addition, from the viewpoint of maintaining the effect of preventing ultraviolet rays, there are many needs for water resistance such as resistance to sweat and water, and many products labeled as waterproof or super waterproof are on sale. Water resistance and super waterproof labeling can be displayed by conducting a water resistance test in accordance with the FDA (U.S. Food and Drug Administration) and COLIPA (European Cosmetic Industry Association) standards and clearing the standards. be.

Generally, a water-in-oil emulsion system having an oily outer phase is used as a means for increasing water resistance. However, the water-in-oil type emulsified system has problems such as stickiness and oily feeling during use, and inferior skin care effects such as moisturizing effect. Furthermore, since it exhibits oil film blocking properties, it is not preferable for mixed skin or oily skin, and there is a problem that it exacerbates sebum troubles such as shine and acne. On the other hand, the oil-in-water emulsified system in which the outer phase is aqueous has a good feeling in use and does not exhibit oil film occlusion, but has a problem in the durability of the UV protection effect due to its poor water resistance. (Patent document 3)

As described in Patent Documents 3 and 4, it is known that blending an oil, a resin component, or a polymer compound with a high water-repellent effect is a means of increasing water resistance. Since it is limited to polymers and resins, it cannot be said that it has completely solved the problem because it is not versatile. In addition, when water resistance is imparted by such a method, it may be difficult to remove the cosmetics with a normal detergent. Furthermore, in an oil-in-water emulsified system, these components are likely to be unstable, and problems may arise in stabilizing the formulation. In other words, in addition to high water resistance and formulation stability, detergency that allows cosmetics to be removed with detergents commonly used at home is also required at the same time.

In view of the above, there has been a demand for a cosmetic composition that is highly safe, has a fresh feel when used, and also has high water resistance, detergency, and formulation stability.

"New Cosmetic Science" 2nd edition, Takeo Mitsui, 2001, published by Nanzando, pp. 497-504

Japanese Patent Application Laid-Open No. 2003-206214 JP 2015-124172 A JP-A-7-89834 JP 2010-90074 A

The present invention has been made in view of the above-mentioned prior art, and is an oil-in-water type cosmetic that has good stability, high safety, and a fresh feeling when used, and is excellent in high water resistance and effective detergency. An object of the present invention is to provide a composition for food.

In order to achieve the above object, as a result of intensive research by the present inventor,
(A) Linear copolymer type polyether/alkylene/methylpolysiloxane copolymer (B) Hydrophobized metal oxide (C) One or more selected from sucrose fatty acid esters or N-acylamino acid salts By containing, it was found that the above problems can be solved, and the present invention has been completed.

That is, the present invention
An oil-in-water cosmetic composition containing the following components A to C.
(A) Linear copolymer type polyether/alkylene/methylpolysiloxane copolymer (B) Hydrophobized metal oxide (C) One or more selected from sucrose fatty acid esters or N-acylamino acid salts

According to the present invention, it is possible to provide an oil-in-water cosmetic composition that has good stability, high safety, and a fresh feeling in use, as well as excellent water resistance and effective detergency.

The present invention will be described in more detail below. In addition, unless there is a special comment, when displaying the compounding quantity of a component below with "%", it means the mass %.

The component (A) linear copolymer type polyether/alkylene/methylpolysiloxane copolymer used in the present invention is in the form of liquid to soft rubber at room temperature. The sequence of monomers constituting the copolymer is a linear block copolymer in which the monomers are alternately bonded. Specifically, it includes components known as poly(oxyethylene-oxypropylene) alkylene-methylpolysiloxane copolymers, and among them, poly(oxyethylene-oxypropylene), known under the cosmetic label name "Polysilicone-13". Most preferred are propylene)butylene-methylpolysiloxane copolymers. Commercially available examples include FZ-2222, FZ-2233, FZ-2250.

The amount of component (A) to be blended is not particularly limited as long as the effect of the present invention is obtained, but it is usually 0.01 to 3.0% by mass, preferably 0%, based on the total amount of the cosmetic composition. It is used in the range of 0.05% to 1.0% by weight. Within this range, good stability, high safety, a fresh feeling in use, high water resistance and effective detergency are very excellent.

Component (A), the linear copolymer type polyether/alkylene/methylpolysiloxane copolymer, may be used alone or in combination thereof.

In the present invention, the component (A) linear copolymer type polyether/alkylene/methylpolysiloxane copolymer has a silicone skeleton, so it imparts slipperiness to the skin, affects non-stickiness, and imparts high water resistance. have a nature. In addition, the hydrophilicity derived from the polyether group is thought to affect the washability and stability. However, even with a copolymer having a silicone skeleton and a polyether group, the pendant type polyether-modified polysiloxane copolymer has poor stability, making it difficult to achieve both water resistance and washability. cannot be effective.

The (B) hydrophobized metal oxide used in the present invention is not particularly limited, and those commonly used in cosmetics can be used. Preferred metal oxides include titanium oxide, zinc oxide and cerium oxide. The method of hydrophobizing treatment is not particularly limited, and generally used treatment methods such as coating treatment, baking treatment, and silane coupling agent treatment are used. The hydrophobizing agent is not particularly limited, and metallic soaps, silicones, fatty acids, phospholipids, fluorine compounds, silylating agents, acylamino acids and the like can be preferably used. In particular, isostearic acid treatment and silicone treatment of fatty acids are preferable from the viewpoint of composition stability, water resistance, and washability. Examples of the silicone used for the silicone treatment include methicone, dimethicone, hydrogen dimethicone, and the like, but the type of silicone is not particularly limited.

(B) The content of the hydrophobized metal oxide is not particularly limited as long as the effects of the present invention can be obtained. It is preferably used in the range of 5.0 to 25% by mass. Within this range, good stability, high safety, a fresh feeling in use, high water resistance and effective detergency are very excellent.

(B) The hydrophobized metal oxide may be used alone or in combination.

Component (C) sucrose fatty acid ester or N-acylamino acid salt used in the present invention is not particularly limited, and those commonly used in cosmetics can be used.

Amino acids constituting the component (C) N-acylamino acid salt are not particularly limited, and preferred examples include glutamic acid, aspartic acid, glycine, alanine, threonine, methylalanine, sarcosine, lysine, arginine, and the like.

The acyl group constituting the component (C) N-acylamino acid salt is not particularly limited, and suitable examples include fatty acids such as decanoyl group, lauroyl group, myristoyl group, palmitoyl group, stearoyl group, oleoyl group and linoleyl group. (including branched fatty acids). Fatty acids may be derived from animals and plants, and examples include acyl groups derived from naturally obtained mixed fatty acids such as coconut oil fatty acid, castor oil fatty acid, olive oil fatty acid, and palm oil fatty acid.

The type of salt of component (C) N-acylamino acid salt is not particularly limited, and suitable examples include inorganic salts such as sodium salt, potassium salt, calcium salt, magnesium salt, aluminum salt; ammonium salt, monoethanolamine. Examples include salts, organic amine salts such as diethanolamine salts and triethanolamine salts, and organic salts such as basic amino acid salts such as arginine salts and lysine salts.

Component (C) N-acyl amino acid salt particularly preferably contains sodium N-stearoyl glutamate, and examples thereof include Amisoft HS-11P and Amylite GCK-12 (both manufactured by Ajinomoto Healthy Supply Co., Ltd.).

Fatty acids constituting the component (C) sucrose fatty acid ester are not particularly limited, and preferred examples include lauric acid, myristic acid, palmitic acid, stearic acid, oleic acid, behenic acid and erucic acid. Among these fatty acids, esters using stearic acid and lauric acid are particularly desirable.

The amount of component (C) sucrose fatty acid ester or N-acylamino acid salt to be blended is not particularly limited as long as the effects of the present invention can be obtained, but is usually 0.01 relative to the total amount of the cosmetic composition. It is used in the range of to 5% by mass, preferably 0.1% to 2% by mass. Within this range, good stability, high safety, a fresh feeling in use, high water resistance and effective detergency are very excellent.

Component (C) sucrose fatty acid ester or N-acylamino acid salt may be used alone or in combination. Component (C) is particularly preferably hydrophilic, and those having an HLB of 12 or more are particularly suitable from the viewpoints of stability, feeling in use, and washability. Component (C) is believed to contribute to emulsion stability in the oil-in-water emulsion system.

Component (D), an alkyl-modified silicone or phenyl-modified silicone having 4 to 12 carbon atoms, used in the present invention is not particularly limited, and those commonly used in cosmetics can be used. Specific component names and display names include methylphenylpolysiloxane, diphenylpolysiloxane/dimethylpolysiloxane copolymer, and caprylyl methicone. These components have a high affinity with the components A and B, and are expected to improve the stability of the formulation and improve the feeling of use by blending them.

The component (E) hydrogenated lecithin used in the present invention is not particularly limited, and those commonly used in cosmetics can be used. Specific trade names include Nikkor Resinol S-10 and Nikkor Resinol S-10M. By blending these components, the stability of the formulation is improved, and furthermore, the squeaky feeling due to the component B is improved, and further improvement of the feeling of use can be expected.

In addition to the essential ingredients described above, the composition of the present invention may optionally contain ingredients commonly used in cosmetics. For example, pearl agents, moisturizers, thickeners, water-soluble polymers, fragrances, bactericides, preservatives, antioxidants, pH adjusters, chelating agents, UV absorbers, anti-inflammatory agents, antioxidants, cooling agents Additives such as crude drug extracts and vitamins can be added as appropriate. When these components are contained, the blending ratio can be appropriately selected depending on the type and purpose. One type may be used alone, or two or more types may be used in combination.

The present invention will be further described with reference to the following examples. It should be noted that these examples do not limit the present invention in any way.

<Sensory property evaluation test>
In the sensory property evaluation test, 10 professional judges scored according to the following evaluation criteria for the feel (sticky feeling, squeaky feeling, freshness) when the evaluation sample was applied to the face, and according to the average score, 4.0 or more was evaluated as ⊚, 3.0 or more and less than 4.0 as ∘, 2.0 or more and less than 3.0 as Δ, and less than 2.0 as x. In addition, 5 hours after the application, the feel (sticky feeling, squeaky feeling) was similarly evaluated.

(Evaluation criteria)
5: Very favorable.
4: Preferred.
3: Neither can be said.
2: Unfavorable.
1: Very unfavorable.

<Evaluation method>
2 mg/cm 2 of the composition was evenly applied to a surface-roughened PMMA (polymethyl methacrylate) plate, and the SPF value was measured with an SPF analyzer (manufactured by Sanyo Boeki Co., Ltd.). Next, the above PMMA plate (coated with each composition) was exposed to running water for 40 minutes, dried sufficiently, and then the SPF value was measured again. The percentage of the SPF value after the water resistance test with respect to the SPF value before the water resistance test was calculated, and the value was defined as the residual rate (%).
<Evaluation Criteria>
◎: Residual rate of 75% or more ○: Residual rate of 50% or more to less than 75% ×: Residual rate of less than 50%

<Evaluation of ease of cleaning>
A panel of 10 experts was asked to actually use it, and the easiness of cleaning (ease of removal) was judged according to the following criteria.
⊚: 8 to 10 people answered that it was easy to wash.
○: 5 to 7 people answered that it was easy to wash.
△: 2 to 4 people answered that it was easy to wash.
x: 0 to 1 persons answered that it was easy to wash.

<Stability>
The prepared formulation is allowed to stand at 40° C. for 2 weeks, and the state (color change in appearance, separation of oil, precipitation due to aggregation of powder) after 2 weeks is visually observed.
⊚: No change in color, separation or aggregation occurred at all.
◯: Slight change in any one of color change, separation and aggregation occurs, but there is no problem in terms of product quality in use.
x: At least one of color change, separation, and aggregation occurs conspicuously, which is undesirable in terms of product quality.

※１ イソステアリン酸処理酸化亜鉛
※２ ハイドロゲンジメチコン処理酸化亜鉛
※３ トリエトキシカプリリルシラン処理酸化亜鉛
※４ イソステアリン酸処理酸化チタン
※５ ハイドロゲンジメチコン処理酸化チタン
※６ トリエトキシカプリリルシラン処理酸化チタン
Ａ’成分はいずれもペンダント型ポリエーテル変性ポリシロキサン共重合体

*1 Isostearic acid-treated zinc oxide *2 Hydrogen dimethicone-treated zinc oxide *3 Triethoxycaprylylsilane-treated zinc oxide *4 Isostearic acid-treated titanium oxide *5 Hydrogen dimethicone-treated titanium oxide *6 Triethoxycaprylylsilane-treated titanium oxide A' All components are pendant-type polyether-modified polysiloxane copolymers

As can be seen from Tables 1 and 2, Examples 1 to 13 of the present invention have good stability, high safety, fresh feeling in use, and high water resistance by blending components A, B, C, D, and E. It has been found to provide excellent cleaning properties and effective cleaning properties.

According to Examples 1 and 2, the water resistance varies depending on the component A, and the higher the amount, the better the water resistance. Feeling of use, stability, and cleanability are reduced. Regarding Examples 4 and 5, these are the results of experiments with component B. The greater the amount of component B blended, the better the water resistance. Stability and detergency are reduced. Examples 8 and 9 are experimental results when the surface treatment of component B is different, and although the effect can be exhibited only when triethoxycaprylylsilane-treated powder is used, there is a slight sense of use and stability. decrease in sexuality. Examples 6 and 7 are the results of experiments with component C, and when the amount is large, the stability is improved and the detergency is improved, but the feel of use and water resistance are slightly reduced. Especially in Examples 1, 8, and 10, remarkable effects have appeared in all items.

Referring to Table 3, Comparative Examples 1 and 2 are examples in which pendant type polyether-modified polysiloxane copolymers were used, but both resulted in poor water resistance and poor stability. . Comparative Example 3 is an example in which zinc oxide and titanium oxide that have not been hydrophobized are used, but results in poor water resistance, stability, and feel during use. Comparative Examples 4 and 5 are examples in which component C was replaced with other surfactants, but resulted in problems in stability and detergency.

A composition of each formulation was prepared by a conventional method. It was confirmed that the effects of the present invention can be obtained in any formulation.

(1) Sunscreen cosmetic ingredient compounding amount (%)
Poly (oxyethylene/oxypropylene) butylene/methyl polysiloxane copolymer 0.15
Hydrophobized zinc oxide*1 15
Methylphenylpolysiloxane 2
Dimethicone 1
tridecyl isononanoate 8
Sucrose stearate 0.5
Sodium N-stearoyl glutamate 0.2
Hydrogenated lecithin 0.3
1,3-butylene glycol 10
Xanthan gum 0.1
Sodium acrylate/sodium acryloyl dimethyl taurate 1.0
Copolymer/Isohexadecane/Polysorbate 80
Preservative Appropriate amount of stabilizer Appropriate amount of purified water Remainder

(2) Sunscreen cosmetic ingredients compounding amount (%)
Poly (oxyethylene/oxypropylene) butylene/methyl polysiloxane copolymer 0.2
Hydrophobized titanium oxide*4 10
Methylphenylpolysiloxane 2
Dimethicone 1
tridecyl isononanoate 8
Sucrose stearate 0.5
Sodium N-stearoyl glutamate 0.2
Hydrogenated lecithin 0.3
1,3-butylene glycol 10
Xanthan gum 0.1
Sodium acrylate/sodium acryloyl dimethyl taurate 1.0
Copolymer/Isohexadecane/Polysorbate 80
Preservative Appropriate amount of stabilizer Appropriate amount of purified water Remainder

(3) Foundation cosmetics compounding ingredients compounding amount (%)
Poly(oxyethylene/oxypropylene) butylene
・ Methyl polysiloxane copolymer 0.15
Hydrophobized zinc oxide*1 10
Hydrophobized titanium oxide*4 10
Iron oxide 0.3
Methylphenylpolysiloxane 2
Dimethicone 1
tridecyl isononanoate 8
Sucrose stearate 0.7
Sodium N-stearoyl glutamate 0.2
Hydrogenated lecithin 0.3
1,3-butylene glycol 10
Xanthan gum 0.1
Sodium acrylate/sodium acryloyl dimethyl taurate 1.5
Copolymer/Isohexadecane/Polysorbate 80
Preservative Appropriate amount of stabilizer Appropriate amount of purified water Remainder

(4) Foundation cosmetics compounding ingredients compounding amount (%)
Poly(oxyethylene/oxypropylene) butylene
・ Methyl polysiloxane copolymer 0.15
Hydrophobized zinc oxide*1 10
Hydrophobized titanium oxide*4 10
Iron oxide 0.3
Methylphenylpolysiloxane 2
Dimethicone 1
tridecyl isononanoate 8
Sucrose stearate 0.7
Sodium N-stearoyl glutamate 0.2
Hydrogenated lecithin 0.3
1,3-butylene glycol 10
Xanthan gum 0.1
Sodium acrylate/sodium acryloyl dimethyl taurate 1.5
Copolymer/Isohexadecane/Polysorbate 80
Preservative Appropriate amount of stabilizer Appropriate amount of purified water Remainder

Claims (6)

the following components A to C
(A) 0.01 to 3.0% by mass of polysilicone-13
(B) 5.0 to 35.0% by mass of hydrophobized metal oxide
(C) 0.01 to 5.0% by mass of one or more selected from sucrose fatty acid esters or N-acylamino acid salts
An oil-in-water cosmetic composition comprising: 2. The oil-in-water cosmetic composition according to claim 1, further comprising (D) one or more selected from alkyl-modified silicones having 4 to 12 carbon atoms and phenyl-modified silicones. 3. The oil-in-water cosmetic composition according to claim 1, further comprising (E) hydrogenated lecithin. 4. The oil-in-water cosmetic composition according to any one of claims 1 to 3, wherein the hydrophobic treatment of component (B) is isostearic acid treatment or silicone treatment. 5. The oil-in-water cosmetic composition according to any one of claims 1 to 4, wherein the amino acid of component (C) N-acylamino acid salt is glutamic acid, aspartic acid, or alanine. The oil-in-water cosmetic composition according to any one of claims 1 to 5, which is a sunscreen cosmetic.