JP2005350438A - Liquid skin cleanser - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a liquid skin cleanser good in foamability and foam quality, suppressed in slimy touch feeling when rinsed, causing no eye irritation, free from tense feeling, yielding refreshing washing finish, good in feeling in use. <P>SOLUTION: This liquid skin cleanser comprises a higher fatty acid salt of the formula(A):R<SB>1</SB>COOM<SB>1</SB>( wherein, R<SB>1</SB>is a 7-21C alkyl or alkenyl; and M<SB>1</SB>is an alkali metal atom or organic amine group ), a hydroxyalkyl polyhydric alcohol ether compound of formula(B)( wherein, R<SB>2</SB>is an 8-18C alkyl or alkenyl; R<SB>3</SB>to R<SB>6</SB>are each H or a 1-3C alkyl; and (n) is an integer of 0-3), and an N-acylamino acid type surfactant. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a liquid skin cleanser that has good foaming, good foam quality, suppresses a slimy feel during washing, does not squeeze into eyes, does not feel sticky, has a refreshing finish, and has an excellent feeling of use. It is.

  Conventionally, in a skin cleanser such as a facial cleanser, a potassium salt of a higher fatty acid is frequently used because it foams, has good foam quality, and has a refreshing feeling after being washed away. However, although the detergent mainly composed of higher fatty acid potassium salt has excellent properties in terms of foaming, foam quality, and refreshing feeling after washing, excessive degreasing and soap residue (scum) ) Remains on the skin, and it has a drawback such that the skin becomes stuck after use.

  Furthermore, it is necessary to maintain the viscosity of the system moderately in order to ensure usability. However, it is difficult to keep the viscosity stable with higher fatty acid salts alone, and gelation and crystal precipitation at low temperatures are likely to occur. Alkanolamide type nonionic surfactants and amphoteric surfactants are generally used as thickeners, but when these thickeners are added, the surfactant remains on the skin after washing and becomes slimy However, there were problems such as giving the skin an unpleasant feeling, and the skin after washing was squeezed and looked.

Conventionally, as a method for solving the above problems, combined use with surfactants such as acylalkyl taurine salt, acyl isethionate salt, phosphate ester salt, acyl amino acid salt, polyoxyethylene alkyl ether, etc. Etc. have been studied (see Patent Documents 1 and 2). In addition, methods for adding amphoteric surfactants and inorganic salts have been studied (see Patent Documents 3 and 4). However, these methods have not been improved, such as insufficient improvement or a tendency to be unfavorable to the feeling of use, so that excellent quality has not been obtained, and further improvement of the liquid skin cleanser is desired. Yes.
JP-A-6-248298 Japanese Patent Laid-Open No. 10-245598 JP 2002-88400 A JP-A-10-77206

  Therefore, the object of the present invention is to provide a liquid skin that has good foaming, good foam quality, suppresses a slimy feel during washing, does not squeeze into eyes, does not feel sticky, and has a refreshed wash. It is to provide a cleaning fee.

  As a result of intensive studies to solve the above problems, the present inventor uses a hydroxyalkyl polyhydric alcohol ether compound and an N-acylamino acid type surfactant in a liquid skin cleanser containing a higher fatty acid salt. As a result, it has been found that a liquid skin cleanser that solves all the above problems can be obtained, and the present invention has been completed.

  That is, claim 1 of the present invention is the following general formula (A)

1

（式中、Ｒ_２は炭素数８〜１８のアルキル基又はアルケニル基、Ｒ_３〜Ｒ_６は水素又は炭素数１〜３のアルキル基、ｎは０〜３の整数を示す。）で表されるヒドロキシアルキル多価アルコールエーテル化合物と、Ｎ−アシルアミノ酸型界面活性剤とを含有することを特徴とする液体皮膚洗浄料である。R ₁ COOM ₁ (A)
(Wherein R ₁ represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, M ₁ represents an alkali metal or an organic amine) and the following general formula (B)

(Wherein R ₂ represents an alkyl group or alkenyl group having 8 to 18 carbon atoms, R _{3 to} R ₆ represent hydrogen or an alkyl group having 1 to 3 carbon atoms, and n represents an integer of 0 to 3). A liquid skin cleanser comprising a hydroxyalkyl polyhydric alcohol ether compound and an N-acylamino acid type surfactant.

（式中、Ｒ_７は炭素数７〜２１のアルキル基又はアルケニル基、Ｍ_２はアルカリ金属又は有機アミンを示す。）で表されるＮ−アシルグリシン型界面活性剤であることを特徴とする請求項２に記載の液体皮膚洗浄料である。Further, according to a second aspect of the present invention, the N-acylamino acid type surfactant is represented by the following general formula (C):

(Wherein R ₇ is an alkyl group or alkenyl group having ₇ to 21 carbon atoms, and M ₂ represents an alkali metal or an organic amine), which is an N-acylglycine type surfactant. A liquid skin cleanser according to claim 2.

Further, according to claim 3 of the present invention, the higher fatty acid salt represented by the general formula (A) is one in which R ₁ has 7 to 12 carbon atoms (A1) and R ₁ has 13 to 21 carbon atoms. The liquid skin cleanser according to claim 1 or 2, wherein the blend ratio (A1) / (A2) is 1/2 to 1/5.

The invention's effect

  The present invention provides a liquid skin cleanser that has good foaming, good foam quality, suppresses the slimy feel when washed off, and does not squeeze into eyes, does not feel sticky, and has a refreshing finish. can do.

  As the higher fatty acid salt represented by the general formula (A) in the present invention, one or more selected from linear saturated fatty acids having 7 to 21 carbon atoms, unsaturated fatty acids and branched chain fatty acids are preferably used. Can do.

  Examples of the higher fatty acid used in the present invention include capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, behenic acid, oleic acid, linoleic acid, linolenic acid, isopalmitic acid, isostearic acid, coconut oil fatty acid and the like. Is mentioned.

  Examples of bases that form salts with fatty acids in the present invention include inorganic salts such as sodium hydroxide and potassium hydroxide, basic amino acids such as L-arginine, monoethanolamine, diethanolamine, triethanolamine, and triisopropanolamine. Aliphatic amines are mentioned.

  Among these higher fatty acid salts, preferred are lauric acid, myristic acid, palmitic acid, and potassium stearate, triethanolamine salt, and L-arginine salt.

  The blending amount of the higher fatty acid salt represented by the general formula (A) in the present invention is preferably 3 to 30% by mass (hereinafter simply referred to as “%”), more preferably 5 to 25%, based on the total amount of the liquid skin cleanser. It is. If the blending amount is less than 3%, sufficient foaming and foam quality may not be obtained. If the blending amount exceeds 30%, it may be squeezed into the eyes or a feeling of tension may be felt after washing.

In higher fatty acid salt used in the present invention, of the general formula the number of carbon atoms of _{R 1} in (A) is 7-12 and (A1), the number by combining the one (A2) is 13 to 21 carbon Better foaming, foam quality, and feeling of use can be obtained. The preferable blending ratio is (A1) / (A2) of 1/2 to 1/5, and more preferably 1/2 to 1/3. When the ratio of the general formulas (A1) and (A2) is within this range, the foaming and foam quality are excellent, and the irritation to the eyes and the feeling of tension can be suppressed.

  Examples of the hydroxyalkyl polyhydric alcohol ether represented by the general formula (B) in the present invention include lauryl glycol hydroxypropyl ether, (lauryl / myristyl) glycol hydroxypropyl ether, and the like, and viscosafe LPE and viscosafe LMPE (respectively). Both are commercially available as Kawaken Fine Chemicals).

  0.5-5% of the compounding quantity of the hydroxyalkyl polyhydric alcohol ether represented by general formula (B) in this invention is preferable, More preferably, it is 1-3%. If it is less than 0.5%, moderate foaming and foam quality may not be fully expected, and if it exceeds 5%, it may become slippery or it may be difficult to obtain a refreshing feeling after washing. .

  The N-acyl amino acid type surfactant in the present invention is an N-acyl amino acid salt having an acyl group having 8 to 22 carbon atoms, such as N-acyl glutamate, N-acyl aspartate, N-acyl. Examples thereof include glycine salt, N-acylmethyl taurine salt, N-acylmethylalanine salt, N-acyl sarcosine salt, etc., and as salts, alkali metals such as potassium and sodium, ammonium or monoethanolamine, diethanolamine, triethanolamine, isopropanol And organic amines such as amines. More specifically, sodium N-lauroyl glutamate, potassium N-myristoyl glutamate, N-coconut oil fatty acid acyl glutamate triethanolamine, potassium N-coconut oil fatty acid glycine, sodium N-lauroylmethylalanine, sodium palm oil fatty acid methyl taurine sodium And so on.

  As the N-acylamino acid type surfactant in the present invention, the N-acylglycine type surfactant represented by the general formula (C) can be most preferably used, and the feeling of use excellent in the refreshing feeling after washing. Can be obtained.

  Examples of the N-acylglycine surfactant represented by the general formula (C) in the present invention include N-coconut oil fatty acid acylglycine sodium, N-coconut oil fatty acid acylglycine potassium, and N-coconut oil fatty acid acylglycine. Examples include triethanolamine and N-lauroylglycine potassium.

  A preferable blending amount of the N-acylglycine type surfactant represented by the general formula (C) in the present invention is 3 to 20%, more preferably 5 to 15% in the total amount of the liquid skin cleanser. If the blending amount is less than 3%, sufficient foaming and foam quality may not be obtained. If the blending amount exceeds 20%, it may be easy to get wet, and it may be difficult to obtain a refreshing feeling after washing. is there.

  In the present invention, the blending ratio (A) / (C) of the higher fatty acid salt represented by the general formula (A) and the N-acylglycine type surfactant represented by the general formula (C) is 2 / It is preferable that it is 1-1 / 2. If the ratio of the higher fatty acid salt represented by the general formula (A) is higher than this range, irritation to the eyes may be increased, and the N-acylglycine type surfactant represented by the general formula (C) If the ratio is high, sufficient foaming or foam quality may not be obtained.

  In addition, the liquid skin cleanser in the present invention preferably has a viscosity of 500 to 5000 mPa · s, more preferably 1000 to 3000 mPa · s, in view of its usability. This viscosity was measured at 20 ° C. using a B-type viscometer rotor no. 3. It can be measured at 12 rpm.

  In the present invention, within the range that does not impair the effects of the invention, in addition to the above essential components, anionic surfactants other than the essential components, amphoteric surfactants, nonionic surfactants, oil components, polymer compounds, Higher alcohols, preservatives, chelating agents, antioxidants, pH adjusters, dyes, fragrances and the like can also be blended.

  The liquid skin cleanser of the present invention can be applied to facial cleansers, hand soaps, body soaps, and the like, and is particularly effective when used as a facial cleanser.

  Hereinafter, the present invention will be described with reference to examples and comparative examples. The present invention is not limited to these.

  The test method of the sensory test shown in the Examples and Comparative Examples is as follows. In addition, the compounding quantity of the composition shown in the following table | surfaces is each displayed by%.

  Ten subjects used a liquid skin cleanser sample to wash their face. Thereafter, the subject himself performed sensory evaluation on the following items (1) to (6). In the evaluation, an average value is calculated according to the following criteria. When the average value is 4.5 or more, it is very good (◎), when the average value is 3.5 to 4.4 (◯), 2.5-3. The case of 4 was judged as bad (x) when the case of 2.4 or less was normal.

The sensory evaluation items are shown below.
(1) Foam 5: Good 4: Slightly good 3: Normal 2: Slightly bad 1: Poor (2) Foam quality 5: Very fine 4: Slightly fine 3: Normal 2: Slightly rough 1: Coarse (3) Luster 5: None 4: Somewhat 3: None None 2: Somewhat 1: Existence (4) Eye irritation 5: Smearing 4: Slightly unsatisfactory 3: Feeling unsatisfactory 3: Neither 2: Slightly I feel like seeing 1: I see it (5) Tightness 5: None 4: Somewhat 3: None None 2: Somewhat 1: None (6) Refreshing 5: Some 4: Somewhat 3 : Neither 2: No somewhat 1: No

Examples 1-8, Comparative Examples 1-3
A liquid skin cleanser (face wash) having the formulation shown in Table 1 was prepared by a conventional method, and the sensory evaluation test was performed. The results are also shown in Table 1.

  As is clear from Table 1, all of the liquid skin cleansing agents of Examples using the components of the present invention had excellent performance. On the other hand, the comparative example lacking any of the essential components was inferior in terms of foaming, foam quality, sliminess, eye irritation, a feeling of squeezing, and a refreshing feeling after washing, and the object of the invention could not be achieved. .

Example 9 (Liquid face wash)
(mass%)
Lauric acid 4.0
Myristic acid 12.0
Potassium hydroxide 4.0
N-coconut oil fatty acid acylglycine potassium 15.0
Lauryl glycol hydroxypropyl ether 2.0
Glycerin 3.0
1,3-butylene glycol 2.0
Ethylene glycol distearate 1.0
Sodium chloride 0.3
Hydroxypropyl methylcellulose 0.1
Dimethyl diallylammonium chloride / acrylamide copolymer 0.1
Fragrance 0.1
Purified water balance

  When a liquid cleanser having the above composition was prepared and evaluated, it had excellent performance in terms of foaming, foam quality, luster, eye irritation, a feeling of gripping, and a feeling of refreshing after washing.

In addition, the fragrance | flavor used in the said Example is a thing of the following fragrance | flavor prescriptions.

Claims (3)

The following general formula (A)
[Chemical formula 1]
R ₁ COOM ₁ (A)
(Wherein R ₁ represents an alkyl group or alkenyl group having 7 to 21 carbon atoms, M ₁ represents an alkali metal or an organic amine) and the following general formula (B)

(Wherein R ₂ represents an alkyl group or alkenyl group having 8 to 18 carbon atoms, R _{3 to} R ₆ represent hydrogen or an alkyl group having 1 to 3 carbon atoms, and n represents an integer of 0 to 3). A liquid skin cleanser comprising a hydroxyalkyl polyhydric alcohol ether compound and an N-acylamino acid type surfactant. The N-acylamino acid type surfactant is represented by the following general formula (C)

(Wherein R ₇ is an alkyl group or alkenyl group having ₇ to 21 carbon atoms, and M ₂ represents an alkali metal or an organic amine), which is an N-acylglycine type surfactant. The liquid skin cleansing material according to claim 1. Higher fatty acid salt represented by the general formula (A) is made from carbon number of _{R 1} is 7-12 and (A1), carbon number of _{R 1} is 13 to 21 and (A2), The liquid skin cleanser according to claim 1 or 2, wherein the blending ratio (A1) / (A2) is 1/2 to 1/5.