JP3970861B2 - Cleaning composition - Google Patents

Description

The present invention relates to a skin cleanser composition and a skin cleansing method using the cleanser composition.

  Conventionally, anionic surfactants such as alkyl sulfate esters, alkyl ether sulfates, α-olefin sulfonates and the like have been widely used as foaming surfactants in cleaning compositions for skin and hair. . These surfactants have a high detergency and a refreshing feeling after washing, but there is a problem that there is a feeling of skin firmness. On the other hand, as so-called hypoallergenic surfactants, sulfosuccinic acid type surfactants, ether carboxylic acid type surfactants, amide ether carboxylic acid type surfactants, N-alkylamide alkanol sulfates and the like have been proposed. However, these surfactants alone are not sufficiently satisfactory in terms of foamability and foam quality.

For this reason, a skin cleansing composition in which an anionic surfactant and trimethylglycine are combined at a specific ratio has been proposed as a cleansing composition having good foaming and excellent usability (Patent Document 1). However, although this foaming composition improves foaming and foam quality, it is not fully satisfactory in terms of the feeling of skin tightness and hair remaining after washing.
JP-A-11-180855

  An object of the present invention is a detergent composition having excellent stability, moist skin after washing, no feeling of firmness or bulkiness, smoothness of fingering during washing, and no feeling of firmness, and a detergent composition thereof The object is to provide a body washing method using an object.

  The present inventor uses a detergent composition containing a surfactant and an amino acid or an amphoteric polymer so that the pH when diluted with water at the time of use is lower than the isoelectric point of the amino acid or amphoteric polymer. We have found that the above problems can be solved if conditions are selected.

The present invention contains (A) a surfactant, (B) an amino acid or an amphoteric polymer, and (C) water, and the pH when diluted to 5% by weight with purified water is below the isoelectric point of component (B) A skin cleansing composition is provided.
The present invention also includes (A) a surfactant, (B) an amino acid or an amphoteric polymer, and (C) water, and the pH when diluted with water at the time of use is below the isoelectric point of component (B). A skin cleansing composition is provided.
The present invention also includes (A) a surfactant, (B) an amino acid or an amphoteric polymer, and (C) water, and when diluted to 5% by weight with purified water, the pH of the component (B), etc. the detergent composition is below the isoelectric point, there is provided a skin cleansing method for cleaning the skin by adding water.

  The cleaning composition of the present invention is excellent in stability, and when the skin is cleaned, it does not feel sticky, is moist, and when the hair is cleaned, the finger of the hair is smooth and soft.

  The surfactant of component (A) used in the present invention is any of an anionic surfactant, a nonionic surfactant, an amphoteric surfactant, and a cationic surfactant having foaming properties suitable for use as a body cleanser. But it ’s okay.

  Examples of the anionic surfactant include polyoxyalkylene alkyl (or alkenyl) ether sulfate, alkyl (or alkenyl) sulfate, higher fatty acid salt, ether carboxylate, amide ether carboxylate, alkyl phosphate ester salt, N-acyl amino acid salts, polyoxyalkylene fatty acid amide ether sulfates, acylated isethionates, acylated taurates and the like can be mentioned. In particular, alkyl phosphate ester salts, polyoxyethylene alkyl ether sulfates, and N-acyl glutamates are preferable in that it is easy to adjust a composition containing these as a weakly acidic detergent.

  Examples of the nonionic surfactant include amine oxide, glycerin fatty acid ester, sorbitan fatty acid ester, alkyl saccharide, polyoxyalkylene alkyl ether, fatty acid alkanolamide, polyoxyalkylene hydrogenated castor oil, and the like. Specifically, lauryl dimethylamine oxide, myristyl dimethylamine oxide, isostearic acid monoglyceride, oleic acid monoglyceride, sorbitan monolaurate, sorbitan monooleate, sorbitan sesquioleate, sorbitan monoisostearate, sorbitan trioleate, alkylpoly Glucosides, coconut oil fatty acid monoethanolamide, coconut oil fatty acid diethanolamide and the like are preferable.

  Examples of amphoteric surfactants include carbobetaine, sulfobetaine, imidazolinium betaine, amide betaine and the like, and particularly fatty acid amidopropylbetaine, hydroxypropylsulfobetaine, desalted secondary imidazolinium betaine and the like. preferable.

  Examples of the cationic surfactant include mono- or di-long-chain alkyl quaternary ammonium salts having a linear or branched long-chain alkyl group to which an alkylene oxide may be added, and particularly carbon number. A linear monoalkyl quaternary ammonium salt of 12 to 16 or a quaternary ammonium salt having a branched alkyl group having 20 to 28 carbon atoms is preferred.

  Especially as a component (A), the said anionic surfactant is preferable.

  One or more surfactants as the component (A) can be used, and it is preferable to contain 1 to 50% by weight, particularly 3 to 30% by weight, in the total composition because foaming and clean feeling are good.

  In the present invention, the surfactant is combined with the amphoteric substance amino acid or amphoteric polymer, and the condition is such that the pH when diluted with water during use is equal to or lower than the isoelectric point of the amino acid or amphoteric polymer. Select. In the present invention, the isoelectric point means a hydrogen ion concentration at which positive and negative charges in a molecule become 0 in an aqueous solution of these amphoteric substances, and is a value at 25 ° C.

  Examples of the amino acid (B) used in the present invention include glycine (isoelectric point 5.97), alanine (isoelectric point 6.00), serine (isoelectric point 5.68), arginine (isoelectric point 10). .8), histidine (isoelectric point 7.47), threonine (isoelectric point 5.64), asparagine (isoelectric point 5.41), glutamine (isoelectric point 5.65), leucine (isoelectric point 5) .98), valine (isoelectric point 5.96), lysine (isoelectric point 9.59), phenylalanine (isoelectric point 5.48), tyrosine (isoelectric point 5.66), urocanic acid (isoelectric point). 4.60), proline (isoelectric point 6.30), oxyproline (isoelectric point 5.74), isoleucine (isoelectric point 5.94), cysteine (isoelectric point 5.02), methionine (isoelectric) Point 5.74), tryptophan (isoelectric point 5.89), glutamic acid (isoelectric) 3.22), and the like aspartic acid (isoelectric point 2.77) is.

  Examples of the amphoteric polymer include acrylic acid / dimethyldiallylammonium chloride copolymer (MERQUAT280: isoelectric point 14 or more, MERQUAT295: isoelectric point 14 or more, manufactured by ONDEO Nalco), acrylamide / acrylic acid / dimethyldiallyl chloride. Ammonium copolymer (MERQUAT PLUS 3330: isoelectric point 5.0, MERQUAT PLUS 3331: isoelectric point 7.0 or more, MERQUAT 3333: isoelectric point 4.3, manufactured by ONDEO Nalco), methyl acrylate, acrylic acid, methacrylic chloride Amidopropyltrimethylammonium acid copolymer (MERQUAT2001: isoelectric point 7.0, manufactured by ONDEO Nalco), acrylamide / acrylic acid / methacrylamidopropyltrimethylammonium chloride copolymer (MERQUAT2003: isoelectric point) 7.0 or more, manufactured by ONDEO Nalco). Among these, acrylic acid / dimethyldiallylammonium chloride copolymer (MERQUAT280, MERQUAT295), acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer (MERQUAT PLUS 3330, MERQUAT PLUS 3331), methyl acrylate / acrylic acid / chloromethacrylamide A propyltrimethylammonium acid copolymer (MERQUAT2001) is preferred.

  As the component (B), those having an isoelectric point of 3 to 12 are preferable, and those having an isoelectric point of 4 to 10 are more preferable because of excellent properties as a cleaning agent.

  As the component (B), one or more selected from amino acids and amphoteric polymers can be used, and the total composition contains 0.1 to 30% by weight, particularly 1 to 20% by weight, and the feeling of use is not sticky. preferable.

  In the cleaning composition of the present invention, the water of component (C) is preferably contained in the total composition in an amount of 20 to 99% by weight, particularly 50 to 96% by weight, and more preferably 70 to 90% by weight.

  The cleaning composition of the present invention has a pH when diluted to 5% by weight with purified water at 25 ° C., or a pH when diluted with water at the time of use, which is below the isoelectric point of component (B). is there. When using 2 or more types of components (B), it adjusts to pH smaller than any isoelectric point. When the pH exceeds the isoelectric point of the component (B), the feeling of firmness of the skin after washing cannot be suppressed, and a sufficiently moist feeling cannot be obtained. The pH of the composition may be adjusted using an acid or alkaline aqueous solution.

Examples of the acid include inorganic acids such as hydrochloric acid, sulfuric acid, and phosphoric acid, and examples of the organic acid include ascorbic acid, adipic acid, succinic acid, acetic acid, oxalic acid, lactic acid, malic acid, aspartic acid, and glutamic acid. Can be mentioned.
Examples of the alkali include hydroxides such as sodium hydroxide and potassium hydroxide, 2-amino-2-methyl-1-propanol, 2-amino-2-methyl-1,3-propanediol, diisopropanolamine and the like. And basic amino acids such as alkanolamine, arginine and lysine.

Further, the cleaning composition of the present invention has a pH when diluted to 5% by weight with purified water at 25 ° C., or a pH when diluted with water at the time of use at a pH of 2 or more and less than 11, particularly pH 4-10. Preferably there is.
In the present invention, the pH is measured using a pH meter at 25 ° C. with an aqueous solution obtained by diluting the composition to 5% by weight or an aqueous solution diluted to the concentration at the time of use.

  When the pH of the aqueous solution is below the isoelectric point, the amphoteric substance is positively charged. Since the surface of skin and hair is usually negatively charged, amphoteric substances that are positively charged when the pH in use is below the isoelectric point are promoted to adsorb to the skin and hair. It is presumed that the effect of the substance is the largest.

  The cleaning composition of the present invention further includes components used in ordinary cleaning agents, such as lanolin and its derivatives, esters such as isopropyl myristate, and oily components such as triglycerides such as coconut oil; polyhydric alcohol, poly Moisturizers such as glycerin fatty acid esters; bactericides such as triclosan and trichlorocarbanilide; anti-inflammatory agents such as potassium glycyrrhizinate and tocopherol acetate; methylparaben, ethylparaben, propylparaben, butylparaben, sodium benzoate, isopropylmethylphenol, etc. Preservatives; ethylenediaminetetraacetic acid or salts thereof, chelating agents such as hydroxyethanediphosphonic acid or salts thereof; thickeners such as carboxyvinyl polymer, carrageenan, hydroxyethylcellulose, cationized cellulose; sodium chloride, etc. Salts; Other pearling agents, scrubbing agents, perfumes, cooling agents such as l- menthol, dyes, ultraviolet absorbers, antioxidants can be contained and plant extracts.

  The cleaning composition of the present invention can be produced by mixing the above-described components. For example, a skin cleaning composition such as a facial cleanser, makeup remover, body shampoo, hand soap, or a hair cleaning composition such as shampoo. It can be a thing.

  In the present invention, when water is added to such a cleaning composition to wash the body, face, hands, feet, or hair, the pH at the time of use is not more than the isoelectric point of component (B). It is adjusted to. Therefore, when the skin is washed, there is no tension, and when the hair is washed, the finger of the hair is smooth and soft.

Examples 1-4, Comparative Examples 1-4
A detergent composition having the composition shown in Table 1 was produced, and the lack of skin feeling after washing the skin, the skin moisture content after washing, and the stability were evaluated. In addition, water is a balance amount (amount to be 100 in total). The results are also shown in Table 1.
In each example, the pH of the composition was measured at 25 ° C. using an Horiba pH meter F-22 (manufactured by Horiba, Ltd.) for an aqueous solution obtained by diluting each composition to 5% by weight with purified water. .

(Evaluation methods)
(1) No skin tension after washing the skin:
Panelists of 10 Japanese women in their 20s and 30s foamed 1g of each detergent composition and massaged their entire face for 60 seconds, then rinsed with running water and dampened the skin after towel drying. Sensory evaluation was performed based on the criteria of An average score was determined, and an average score of 2.5 to 3.0 was indicated as ◯, 1.5 to 2.4 as Δ, and 1.0 to 1.4 as ×.
3; It's not tangled.
2;
1;

(2) Skin moisture after washing:
After washing the entire face and towel-drying in the same manner as in (1), the skin moisture content after 5 minutes was measured with Corneometer CM825 (Courage + Khazaka electronic GmbH). Compared with the amount of skin moisture before washing, the ratio after washing / before washing was determined and evaluated according to the following criteria.
○: equivalent to that before face washing (water content ratio is 0.9 or more).
Δ: Slightly less than before washing (moisture ratio is 0.6 or more and less than 0.9).
X: It is clearly reduced from that before face washing (ratio of water content is less than 0.6).

(3) Stability:
After putting 80 g of each cleaning composition into a 100 mL glass sample bottle and storing it at 25 ° C. for 1 day, the viscosity was measured and evaluated according to the following criteria.
○: Almost no thickening.
Δ: Clearly thickened.
X: Remarkably thickened.

Example 5 (face wash)
A face wash having the following composition was produced.
(component)
Alkyl (C11,13,15) potassium phosphate 15 (wt%)
Glycerin mono-2-ethylhexyl ether 5
Polyoxyethylene (9) tridecyl ether 5
Cocamidopropyl betaine 5
Palm oil fatty acid diethanolamide 0.5
Polyglyceryl monolaurate 1
Serine (isoelectric point 5.68) 20
Carboxyvinyl polymer 1
Highly polymerized polyethylene glycol (Alcox E-100, manufactured by Meisei Chemical Co., Ltd.) 0.1
Glycerin 10
Propylene glycol 10
Phosphoric acid Titanium oxide 0.01
Methylparaben 0.2
Perfume proper amount dibutylhydroxytoluene 0.1
Purified water balance (pH (5 wt% aqueous solution): 5.0)

Example 6 (face wash)
A face wash having the following composition was produced.
(component)
Polyoxyethylene (2) sodium lauryl ether phosphate 15 (wt%)
Sodium Cocoyl Glutamate (Amisoft CS-11, manufactured by Ajinomoto Takara Corporation) 5
Lauroyl hydroxysulfobetaine 5
Ethylene glycol distearate 3
Alanine (isoelectric point 6.00) 5
Hydroxyethyl cellulose 0.5
Cationic polymer (Mercoat 550, manufactured by ONDEO Nalco) 0.5
Sorbitol 10
Isoprene glycol 10
Sodium lactate 1
Mica titanium (Timiron Starluster MP-115, manufactured by Merck Japan) 0.01
Sodium benzoate 0.2
Polyethylene beads 0.8
Perfume proper amount talc 3
Edetate disodium 0.1
Purified water balance (pH (5% by weight aqueous solution): 5.5)

Example 7 (body shampoo)
A body shampoo having the following composition was produced.
(component)
Polyoxyethylene (2) sodium lauryl ether phosphate 20 (wt%)
Alkyl polyglucoside (AG-10LK, manufactured by Kao Corporation) 5
Lauroyl hydroxysulfobetaine 5
Lauric acid diethanolamide 3
Ethylene glycol distearate 3
Arginine (Isoelectric point 10.8) 0.5
Amphoteric polymer (isoelectric point 5.0;
MERQUAT PLUS 3330, manufactured by ONDEO Nalco) 3
Hydroxypropyl methylcellulose 0.5
Sorbitol 10
Dipropylene glycol 10
Malic acid appropriate amount l-menthol 0.1
Sodium benzoate 0.2
Perfume Appropriate amount 1-hydroxyethane-1,1-diphosphonic acid (Dequest 2010CS, manufactured by Solusia Japan) 0.1
Dye (Blue No. 1) 0.0002
Purified water balance (pH (5 wt% aqueous solution): 5.0)

Example 8 (Hand soap)
A hand soap having the following composition was produced.
(component)
Potassium lauryl phosphate 5 (wt%)
Palm oil fatty acid diethanolamide 3
Polyoxyethylene (3) Polyoxypropylene (7) Butyl ether 3
Lauryldimethylamine oxide 5
Cocamidopropyl betaine 5
Arginine (Isoelectric point 10.8) 15
Maltitol 0.5
Glycerin 10
Propylene glycol 10
Ethanol 5
Tuberose polysaccharide 0.5
Isopropylmethylphenol 0.01
Methylparaben 0.2
l-Menthol 0.1
Perfume appropriate amount purified water balance (pH (5 wt% aqueous solution): 8.5)

Example 9 (medicinal hand soap)
A medicinal hand soap having the following composition was produced.
(component)
Alkyl glucoside (AG-10LK, manufactured by Kao Corporation) 10 (wt%)
Polyoxyethylene (4) lauryl ether 3
Polyoxyethylene (20) palm oil fatty acid sorbitan (Leodol TW-L120, manufactured by Kao Corporation) 1
Polyoxyethylene (60) hydrogenated castor oil 0.5
Cationic fungicide (Sanisol P, manufactured by Kao Corporation) 1
Lauryltrimethylammonium chloride 10
Serine (isoelectric point 5.68) 0.5
Glycerin 10
Amphoteric polymer (isoelectric point 14 or higher; MERQUAT 280, manufactured by ONDEO Nalco) 1
Ethanol 3
Perfume appropriate amount pigment (Yellow No. 1) 0.0001
Edetate disodium 0.1
Methylparaben 0.1
Succinic acid appropriate amount purified water balance (pH (5% by weight aqueous solution): 5.5)

When water was added to the skin cleansing compositions of Examples 5 to 9 to wash the skin, the skin was not moist after washing and was moist . Also, none of the detergent composition of Example 5-9 is excellent in stability.

Claims (6)

A skin cleanser containing (A) a surfactant, (B) an amino acid or an amphoteric polymer, and (C) water and having a pH below the isoelectric point of component (B) when diluted to 5% by weight with purified water Agent composition. A skin cleanser composition containing (A) a surfactant, (B) an amino acid or an amphoteric polymer, and (C) water, and having a pH below the isoelectric point of component (B) when diluted with water during use. . The amino acid of component (B) is glycine, alanine, serine, arginine, histidine, threonine, asparagine, glutamine, leucine, valine, lysine, phenylalanine, tyrosine, urocanic acid, proline, oxyproline, isoleucine, cysteine, methionine, tryptophan, The skin cleanser composition according to claim 1 or 2, which is selected from glutamic acid and aspartic acid. The amphoteric polymer of component (B) is an acrylic acid / dimethyldiallylammonium chloride copolymer, an acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer, a methyl acrylate / acrylic acid / methacrylamidopropyltrimethylammonium chloride copolymer, and The skin cleansing composition according to claim 1 or 2, which is selected from acrylamide / acrylic acid / methacrylamidopropyltrimethylammonium chloride copolymer. The skin cleansing composition according to claim 1 or 2, wherein the component (B) has an isoelectric point of 3 to 12. Washing containing (A) surfactant, (B) amino acid or amphoteric polymer, and (C) water, and having a pH below the isoelectric point of component (B) when diluted to 5% by weight with purified water the compositions, skin cleansing method by addition of water to wash the skin.