JP2008150303A - Skin cleanser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To obtain a skin cleanser having an excellent foam quality from the initial stage of foaming. <P>SOLUTION: The skin cleanser comprises (A) an anionic surfactant, (B) a higher fatty acid and/or a higher alcohol and (C) (c1) a polyoxyethylene alkyl ether represented by general formula (1): R<SP>1</SP>-O-(CH<SB>2</SB>CH<SB>2</SB>O)<SB>m</SB>-H (wherein, R<SP>1</SP>is a 8-20C branched alkyl group; m is an average addition molar number of ethylene oxide of 10-20) and/or (c2) a polyoxyethylene sorbitan fatty acid ester containing a 8-20C fatty acid residue and having an average addition molar number of 1-30. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a skin cleanser with good foam quality.

  In the case of skin cleansing agents such as facial cleansers and whole body cleansing agents, in addition to high detergency, in order to enhance the feeling of use, it is required to have excellent foam performance such as foaming properties and foam quality. For this reason, skin cleansing agents combining various surfactants and the like have been studied. For example, Patent Document 1 describes a skin cleansing composition in which a specific phosphate ester type surfactant is combined with myristic acid or myristyl alcohol. Although this skin cleansing composition had good foaming, it was not satisfactory in terms of foam texture and creaminess in the early stage of foaming.

On the other hand, a liquid detergent composition comprising a combination of a non-soap anionic surfactant, an amphoteric surfactant, a nonionic surfactant having an HLB of 6 to 18 and a higher alcohol as a micelle growth promoter has been proposed (Patent Literature). 2). Thus, although such a liquid detergent composition has been shown to be excellent in detergency and low-temperature stability, no foam quality is described.
JP 2006-206443 A JP 2004-91522 A

  An object of the present invention is to provide a skin cleanser having good foam quality from the beginning of foaming.

  The present inventors use a combination of an anionic surfactant, a higher fatty acid and / or a higher alcohol, and a specific nonionic surfactant in combination so that the foam texture is fine, creamy and hard from the beginning of foaming. It has been found that a skin cleanser that gives elastic foam can be obtained.

The present invention includes the following components (A), (B) and (C):
(A) an anionic surfactant,
(B) higher fatty acids and / or higher alcohols,
(C) (c1) General formula (1)
R ¹ —O— (CH ₂ CH ₂ O) _m —H (1)
(Wherein R ¹ represents a branched alkyl group having 8 to 20 carbon atoms, and m is a number of 10 to 20 representing the average number of moles of ethylene oxide added)
And / or (c2) skin containing a polyoxyethylene sorbitan fatty acid ester having a fatty acid residue having 8 to 20 carbon atoms and an average added mole number of ethylene oxide of 1 to 30 A cleaning agent is provided.

  The detergent composition of the present invention has a good foam quality, has a fine and creamy foam from the beginning of frothing, and provides a hard and elastic foam.

Examples of the anionic surfactant of component (A) used in the present invention include alkyl phosphate ester salts, alkane sulfonates, alkyl sulfates, acylated amino acid salts, polyoxyethylene alkyl ether sulfates, and alkyl benzene sulfonates. N-acyl-N-methyl taurate, alpha olefin sulfonate, higher fatty acid ester sulfonate, alkyl ether acetate, polyoxyethylene alkyl ether acetate, and the like. Of these, polyoxyethylene alkyl ether sulfate, alkyl phosphate ester salt, acylated amino acid salt, and polyoxyethylene alkyl ether acetate salt are preferred, and in particular, polyoxyethylene alkyl ether sulfate, monoalkyl phosphate ester salt, Acylated amino acid salts are preferred.
As the salt used here, metal salts such as sodium, potassium and magnesium; ammonium salts; organic ammonium salts such as monoethanolammonium salt, diethanolammonium salt and triethanolammonium salt are preferable.

  One or more anionic surfactants of component (A) can be used, and 10 to 40% by mass, especially 10 to 25% by mass in the total composition can satisfy both foaming and foam quality. Is preferable.

  As the higher fatty acid and higher alcohol of the component (B) used in the present invention, those having an average carbon number of 11 to 18 acyl group or alkyl group are preferred, and those of a straight chain type are more preferred. Specific examples include lauric acid, myristic acid, palmitic acid, stearic acid, lauryl alcohol, myristyl alcohol, palmityl alcohol, stearyl alcohol and the like.

  As the component (B), a higher fatty acid and a higher alcohol can be used in combination. Component (B) is a total amount of higher fatty acid and higher alcohol, and 0.5 to 5% by mass, particularly 1 to 3% by mass in the total composition gives creamy foam, This is preferable because storage stability is improved.

Next, the component (C) is a component that is used to improve the foam quality from the initial stage of foaming and to obtain a creamy and hard foam. Among them, the polyoxyethylene alkyl ether of (c1) It is represented by the general formula (1), and R ¹ is a branched alkyl group having 8 to 20 carbon atoms, and particularly preferably a branched alkyl group having 12 to 14 carbon atoms. If R ¹ is a linear alkyl group, good foam quality cannot be obtained from the beginning of foaming. Moreover, m is a number of 10 to 20 representing the average added mole number of ethylene oxide, and is particularly preferably 12 to 20.

  On the other hand, the polyoxyethylene sorbitan fatty acid ester (c2) has a fatty acid residue having 8 to 20 carbon atoms, and particularly preferably has a fatty acid residue having 14 to 18 carbon atoms. The average number of moles of ethylene oxide added per molecule is preferably 1 to 30, particularly 15 to 25 in total.

Especially as a component (C), the polyoxyethylene branched alkyl ether (1) of (c1) is more preferable at the point of the foam quality from the initial stage of foaming, and the hardness of foam. Also, (c1) and (c2) can be used in combination.
The component (C) is preferably contained in the total composition in an amount of 1 to 5% by mass, particularly 1.5 to 3% by mass, from the viewpoint of foam quality at the initial stage of foaming and foam hardness.

  The skin cleanser of the present invention further comprises (D) the general formula (2)

(Wherein R ² represents a hydrocarbon group having 4 to 10 carbon atoms)
The glyceryl ether represented by the formula (1) can be contained, and the foam volume is increased by enhancing foaming and foam quantity, and a creamier feel can be obtained.

R ³ is preferably an alkyl group or alkenyl group having 4 to 10 carbon atoms, such as an n-butyl group, an isobutyl group, a tert-butyl group, an n-pentyl group, an isopentyl group, an n-hexyl group, an isohexyl group, Alkyl groups such as n-heptyl group, n-octyl group, 2-ethylhexyl group, n-nonyl group and n-decyl group are preferred.

  One or more types of component (D) can be used, and 0.5 to 5% by mass, particularly 0.5 to 3% by mass of the total composition can satisfy both foaming and foam quality. preferable.

  The skin cleanser of the present invention is a component used in a normal cleanser composition in addition to the above components, for example, surfactants other than those described above, perfumes, moisturizers, anti-acne agents, antioxidants, anti-free radical agents, Generally used in opacifiers, stabilizers, emollients, hydroxy acids, vitamins, ceramides, preservatives, sequestering agents, thickeners, UV absorbers, UV protection agents, inorganic salts, pigments, and other cosmetics It can contain chemicals used, organic solvent substances such as ethanol, volatile components, and the like.

In the skin cleanser of the present invention, the pH of an aqueous solution diluted 20-fold with water is 5 to 7, particularly pH 5.5 to 6.5, and there is little irritation to the skin and the excellent cleaning power is impaired. This is preferable because the foaming during washing is improved.
In such a weakly acidic to neutral pH detergent composition, the higher fatty acid of component (B) is considered to exist as a mixture of fatty acid and fatty acid salt.

If necessary, the pH of the skin cleanser is an inorganic acid such as hydrochloric acid, sulfuric acid or phosphoric acid; an organic acid such as citric acid, succinic acid, lactic acid, malic acid, pyrrolidone carboxylic acid, tartaric acid, glycolic acid or ascorbic acid; It can be adjusted using a pH adjuster such as acidic amino acids such as glutamic acid and aspartic acid; hydroxides such as sodium hydroxide and potassium hydroxide; ammonia or aqueous ammonia; basic amino acids such as arginine and lysine.
In addition, after diluting the skin cleaning agent 20 times with purified water and stirring to obtain a 5% by mass aqueous solution, the pH was adjusted to 20 ° C. using a pH meter (for example, model number F-22, manufactured by Horiba, Ltd.) It is the value measured by.

  The skin cleansing agent of the present invention can be produced by weighing the components contained therein and mixing and stirring in an arbitrary order in water or an aqueous medium mainly containing water and containing other water-soluble solvents such as alcohol. The order of mixing and dissolution is not particularly limited.

The skin cleanser of the present invention is obtained as a liquid or paste-like composition, and the viscosity at 30 ° C. is from 500 to 3000 mPa · s, particularly from 1000 to 2500 mPa · s. It is preferable in that it is easy and foaming is easy.
Viscosity was obtained by placing the skin cleanser in a 100 mL bottle (As One Standard Bottle PS-No. 11) and allowing it to stand for 3 hours in a thermostatic bath at 30 ° C., and then using a B-type viscometer (TOKIMEC INC., Rotor No. 3, 30 rpm).

  The skin cleanser of the present invention can be a facial cleanser, whole body cleanser, hand soap, cleansing agent and the like.

Examples 1-7 and Comparative Examples 1-4
The components shown in Table 1 were weighed and added to water, and stirred well at 50 ° C. to obtain a skin cleanser composition (body shampoo). The pH of the aqueous solution diluted 20 times with water was measured with a pH meter (manufactured by Horiba, model number F-22). Moreover, the foam quality at the initial stage of foaming, the foam quality when sufficiently foamed, and the hardness of the foam were evaluated. For foaming, both hands were appropriately wetted with hot water (about 40 ° C.) in advance, and about 1 g of each skin cleansing agent was taken and evaluated. The results are also shown in Table 1.

(Evaluation methods)
(1) Initial foam quality:
Ten professional evaluators performed sensory evaluation of the foam quality (fineness of foam, creaminess) when foaming was started for each skin cleansing agent. The number of evaluators who evaluated “good foam quality” was shown.

(2) Foam quality when fully foamed:
Ten professional evaluators performed sensory evaluation of the foam quality (fineness of foam, creaminess) after foaming for about 20 seconds for each skin cleansing agent. The number of evaluators who evaluated “good foam quality” was shown.

(3) Hardness of foam:
Ten professional evaluators performed sensory evaluation on the elasticity of the foam after foaming for about 20 seconds for each skin cleanser. The number of evaluators who evaluated that “the foam is elastic” was shown.

Claims (4)

The following components (A), (B) and (C):
(A) an anionic surfactant,
(B) higher fatty acids and / or higher alcohols,
(C) (c1) General formula (1)
R ¹ —O— (CH ₂ CH ₂ O) _m —H (1)
(Wherein R ¹ represents a branched alkyl group having 8 to 20 carbon atoms, and m is a number of 10 to 20 representing the average number of moles of ethylene oxide added)
And / or (c2) skin containing a polyoxyethylene sorbitan fatty acid ester having a fatty acid residue having 8 to 20 carbon atoms and an average added mole number of ethylene oxide of 1 to 30 Washing soap.   The skin cleanser according to claim 1, wherein the pH of the aqueous solution diluted 20 times with water is 5-7. Furthermore, (D) General formula (2)

(Wherein R ² represents a hydrocarbon group having 4 to 10 carbon atoms)
The skin cleanser of Claim 1 or 2 containing the glyceryl ether represented by these.   The skin cleanser according to any one of claims 1 to 3, wherein the anionic surfactant of component (A) is selected from monoalkyl phosphate esters, acylated amino acid salts and polyoxyethylene alkyl ether sulfates. Agent.