JP6340395B2 - Foam-based water-based cosmetic - Google Patents

Description

The present invention relates to an aqueous cosmetic used by being discharged in the form of foam. More specifically, the present invention relates to a water-based cosmetic that has a good foam state at the time of discharge and a good foam retention, and when applied to the skin, defoams in a timely manner and quickly adjusts to the skin.

  Cosmetics that are applied in the form of foam have a smooth feel when touching the skin, and cleansing cosmetics such as makeup removers, facial cleansers, hand soaps, body soaps, and other types (rinse off type) ) Widely used in cosmetics. For example, Patent Document 1 discloses a composition for a non-gas former containing an N-long chain acyl-α-amino acid salt, which is considered to form creamy bubbles and hardly cause pump clogging.

  In recent years, various types of cosmetics such as skin care cosmetics that are not washed away (leave on type) have been proposed which are used by being discharged in the form of foam. However, since ionic surfactants that have been blended into conventional wash-out type cosmetics have irritation to the skin, non-ionic surfactants are mainly used in non-wash-out type cosmetics. Yes.

  For example, Patent Document 2 describes that by combining a combination of an alkylpolyglucoside and a nonionic surfactant having an HLB of 12 to 15, the foam extinction property and the foam formation property at low temperature are improved, Patent Document 3 describes a water-based external composition for a screen former that is solubilized by adding a nonionic surfactant, and is a composition for use in a mode in which it is not removed (not washed away) after coating. It is said that.

JP-A-8-131809 JP 2014-125436 A Japanese Patent Laid-Open No. 2006-128423

However, conventional cosmetics that are foamed with a nonionic surfactant are not sufficiently foam-forming, have poor foam quality and foam breakage, and give a sticky feeling to use.
Therefore, the problem in the present invention is that it is non-sticky, does not irritate the skin, has a good foam quality that is dense, smooth and rich in elasticity, and is discharged and used in a foam shape excellent in foam retention and foam breakage. It is to provide an aqueous cosmetic.

  As a result of intensive studies to solve the above-mentioned problems, the present inventor adopted a combination of an anionic surfactant and an amphoteric surfactant as a surfactant, the blending amount thereof is set to a predetermined value or less, The present inventors have found that a water-based cosmetic that solves the above-mentioned problems can be obtained by blending a functional polymer, and the present invention has been completed.

That is, the present invention is a water-based cosmetic used by discharging in a foam,
(A) 0.005 to 1.5% by mass of an anionic surfactant,
(B) 0.01 to 0.3% by mass of an amphoteric surfactant, and
(C) An aqueous cosmetic comprising a water-soluble polymer is provided.

  The water-based cosmetic composition of the present invention forms a foam having a good foam quality that is dense and smooth when discharged in the form of foam, and is excellent in foam retention and foam breakage, non-sticky, and non-sticky. There is no irritation.

  The aqueous cosmetic used by discharging in the form of foam according to the present invention (hereinafter also referred to as “foamed aqueous cosmetic”) includes (A) an anionic surfactant, (B) an amphoteric surfactant, and ( C) A water-soluble polymer is contained as an essential component.

  (A) Anionic surfactant in this invention can be selected from the anionic surfactant which can be used for cosmetics etc. Examples thereof include N-acyl amino acid salts, N-acylmethyl taurate salts, alkyl ether phosphate ester salts, alkyl sulfate ester salts, and polyoxyethylene alkyl ether sulfate salts. However, in the case of a cosmetic that does not wash away, it is preferable to select an anionic surfactant other than the higher fatty acid soap from the viewpoint of usability such as skin familiarity and sliminess.

  Particularly preferred in the present invention is at least one selected from N-acylamino acid salts and N-acylmethyltaurine salts. Specific examples include N-acyl glutamate such as potassium cocoyl glutamate, N-acyl-N-methyl-β-alanine salt, N-acyl sarcosinate salt, N-cocoyl taurine sodium, N-cocoyl-N-methyl. Taurine sodium, N-lauroyl-N-methyl taurine sodium, N-coconut oil fatty acid-N-methyl taurine sodium, N-coconut oil fatty acid-N-methyl taurine triethanolamine, N-palm oil fatty acid-N-ethyl taurine tri Ethanolamine, N-cocoyl taurine magnesium, N-cocoyl-N-methyltaurine magnesium, N-lauroyl-N-taurine magnesium, N-lauroyl-N-methyltaurine magnesium, N-coconut oil fatty acid-N-methyltaurine magnesium, etc. Is exemplified, The present invention is not limited to these. In this invention, these components can mix | blend 1 type (s) or 2 or more types.

  The amount of the (A) anionic surfactant in the aqueous cosmetic of the present invention is 1.5% by mass or less, preferably 0.8% by mass or less, more preferably 0.5% by mass or less, and still more preferably 0. .3% by mass or less. If it exceeds 1.5% by mass, it may cause irritation when the cosmetic is of a type that does not wash away. The lower limit of the amount is not particularly limited, but is 0.005% by mass or more, preferably 0.01% by mass or more, more preferably 0.02% by mass or more in order to obtain excellent foamability. However, when N-acylmethyltaurine salt is used as the anionic surfactant, the blending amount is preferably 1.0% by mass or less from the viewpoint of familiarity with the skin.

  The (B) amphoteric surfactant in the present invention is a surfactant having at least one cationic functional group and one anionic functional group in the molecule, and can be selected from those usable for cosmetics and the like. In the present invention, betaine amphoteric surfactants such as alkyldimethylaminoacetic acid betaine, alkylamidopropyldimethylacetic acid betaine, 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine are preferably used.

  The blending amount of the (B) amphoteric surfactant in the aqueous cosmetic of the present invention is 0.3% by mass or less, more preferably 0.2% by mass or less, and further preferably 0.1% by mass or less. If it exceeds 0.3% by mass, it may cause irritation when the cosmetic is a type that does not wash away. The lower limit of the amount is not particularly limited, but is 0.01% by mass or more, preferably 0.03% by mass or more, and more preferably 0.05% by mass or more in order to obtain excellent foamability.

The total amount of (A) anionic surfactant and (B) amphoteric surfactant in the aqueous cosmetic of the present invention is 1.8% by mass or less, and the upper limit of this total amount is, for example, 1 Needless to say, all intermediate values of 0.5 mass% or less, 1.0 mass% or less, 0.5 mass% or less, 0.3 mass% or less, or 0.2 mass% or less are included.
The blending ratio of (A) anionic surfactant to (B) amphoteric surfactant is preferably 10: 1 to 1:10, more preferably 5: 1 to 1: 5, Preferably it is 3: 1 to 1: 3.

  The water-soluble polymer (C) in the present invention is preferably a water-soluble polymer that can be blended in cosmetics and the like, and has an average molecular weight of 1,000,000 or less, for example 500,000 or less, or 100,000 or less.

  Specific examples include polyalkylene glycols having an average molecular weight of 10,000 to 20,000 (for example, PEG-240, PEG-400, PEG-450, etc.), (acryloyldimethyltaurate ammonium / beheneth methacrylate-25) crosspolymer, (PEG- 240 / decyltetradeceth-20 / HDI) copolymer and the like are preferably used.

  The amount of the (C) water-soluble polymer in the aqueous cosmetic composition of the present invention is 0.01 to 1.8% by mass, preferably 0.03 to 1.5% by mass, more preferably 0.04 to 1.%. 2% by mass. When the blending amount is less than 0.01% by mass, the foam quality improving effect is not observed, and when the blending amount exceeds 1.8% by mass, stickiness may occur.

  In the aqueous cosmetic composition of the present invention, the foam quality and foam smoothness can be further improved by blending sugars in addition to the essential components (A), (B) and (C).

  The saccharides in the present invention include monosaccharides, disaccharides, oligosaccharides, polysaccharides, sugar alcohols and derivatives thereof. Specific examples include sorbitol, maltitol, erythritol, xylitol, and trehalose.

  The compounding quantity of the saccharide | sugar in the aqueous cosmetics of this invention is 1-10 mass%, Preferably it is 2-8 mass%, More preferably, it is 3-6 mass%. If the blending amount is less than 1% by mass, the foam quality improving effect cannot be obtained, and if it exceeds 10% by mass, the usability may be deteriorated.

  The cosmetic of the present invention is an aqueous cosmetic (foamed aqueous cosmetic) used by being discharged in the form of a foam. “Cosmetic used by being discharged in the form of foam” in the present specification is an aerosol form that is accommodated together with a propellant (propellant) and sprayed in a foam form (spray) from the nozzle by the pressure of the propellant. It includes cosmetics and non-aerosol cosmetics that are contained in a container equipped with a foam discharge mechanism such as a pump without using a propellant and are discharged in the form of foam through the mechanism.

  The “aqueous cosmetic” in the present specification means a cosmetic mainly composed of water and a water-soluble component, but a small amount, for example, 10% by mass or less, preferably 5% by mass or less, more preferably 1% by mass. The following oil components may be included.

  The oily component which can be mix | blended is an oily component widely used for cosmetics, and is not specifically limited. Examples include fragrances, hydrocarbon oils, ester oils, silicone oils, animal and vegetable oils, oil-soluble UV absorbers, and the like.

When the aqueous cosmetic of the present invention contains an oily component such as a fragrance, it is preferable to blend a nonionic surfactant at the same time. The compounding quantity of a nonionic surfactant is 1 mass% or less, Preferably it is about 0.5 mass%.
The aqueous cosmetic of the present invention includes a form that does not contain an oil and / or a nonionic surfactant.

The aqueous cosmetic composition of the present invention may contain other components that can be blended in the cosmetic composition and the like as long as the effects of the present invention are not impaired.
Other optional components include humectants such as polyhydric alcohols, lower alcohols, pH adjusters, chelating agents, preservatives, various agents, powder components (for example, white pigments such as titanium oxide and zinc oxide, iron oxides, etc. Examples thereof include, but are not limited to, color pigments, extender pigments, pearlescent agents, and particulate metal oxides. In addition, the water-based cosmetics of this invention include the aspect which does not contain a powder component.
Moreover, it is preferable that the aqueous cosmetic of this invention adjusts pH to the range of 5-7 from a foaming property and a skin irritation viewpoint.

  The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. Unless otherwise specified, the blending amount is represented by mass% with respect to the total amount of the composition in which the component is blended.

Aqueous cosmetics were prepared according to the formulations listed in Tables 1 to 3 below. A special panel on the quality of the foam discharged, the usability when applied to the skin, etc. Evaluation was made according to the following criteria.
A +: Excellent A: Excellent B: Normal C: Inferior

  In Comparative Examples 1 and 2 in which only one of the anionic surfactant and the amphoteric surfactant was blended, the quality of the foam formed was poor. Although the foam quality was improved by combining an anionic surfactant and an amphoteric surfactant, the improvement of the foam quality was insufficient unless a water-soluble polymer was added (Comparative Example 3 and Comparative Example). 4). Further, even when the surfactant was replaced with a natural surfactant, good foam quality was not obtained (Comparative Example 5). On the other hand, in Example 1 in which a water-soluble polymer was blended in addition to the amphoteric surfactant and the anionic surfactant, both the foam quality and usability were excellent. Example 2 in which an oily fragrance was blended with a nonionic surfactant also had almost the same characteristics as Example 1.

  Even if the kind of the water-soluble polymer to be blended was changed, good foam quality, extremely excellent foam retention, and foam elasticity were obtained (Examples 3 to 6). However, in Comparative Example 6 in which succinoglycan having a molecular weight exceeding 1 million was blended, the container was clogged, and usability could not be evaluated.

  In Examples 7 to 12 in which N-cocoylmethyl taurine Na was added in addition to potassium cocoyl glutamate as an anionic surfactant combined with an amphoteric surfactant (lauryl betaine), the fineness of the foam formed was further improved. . However, when the amount of N-cocoylmethyl taurine Na exceeds 0.1% by mass, the foam quality is excellent and the effect of the present invention is achieved, but the familiarity when applied to the skin is reduced (Example 9 and 12).

Claims (4)

A water-based cosmetic for use in the form of foam,
(A) 0.005 to 1.5% by mass of an anionic surfactant,
(B) 0.01 to 0.3% by mass of an amphoteric surfactant, and
(C) including a water-soluble polymer,
The anionic surfactant is potassium cocoyl glutamate, N-acyl-N-methyl-β-alanine salt, N-acyl sarcosinate salt, N-cocoyl taurine sodium, N-cocoyl-N-methyl taurine sodium, N -Lauroyl-N-methyltaurine sodium, N-coconut oil fatty acid-N-methyltaurine sodium, N-coconut oil fatty acid-N-methyltaurine triethanolamine, N-palm oil fatty acid-N-ethyltaurine triethanolamine, N -From the group consisting of cocoyl taurine magnesium, N-cocoyl-N-methyl taurine magnesium, N-lauroyl-N-taurine magnesium, N-lauroyl-N-methyl taurine magnesium, and N-coconut oil fatty acid-N-methyl taurine magnesium 1 type selected Is 2 or more,
The amphoteric surfactant is one or two selected from the group consisting of alkyldimethylaminoacetic acid betaine, alkylamidopropyldimethylacetic acid betaine, and 2-alkyl-N-carboxymethyl-N-hydroxyethylimidazolinium betaine That's it,
The water-soluble polymer is a group consisting of polyalkylene glycol having an average molecular weight of 10,000 to 20,000, (acryloyldimethyltaurate ammonium / behenethmethacrylate-25) crosspolymer, and (PEG-240 / decyltetradeceth-20 / HDI) copolymer. An aqueous cosmetic, characterized in that it is at least one selected from the group consisting of: The aqueous cosmetic according to claim 1, further comprising a saccharide selected from the group consisting of sorbitol, maltitol, erythritol, xylitol, and trehalose. The aqueous cosmetic according to claim 1 or 2, further comprising an oil content of 10% by mass or less. The aqueous cosmetic according to claim 3, further comprising 1% by mass or less of a nonionic surfactant.