JP6127671B2 - Skin cleanser composition - Google Patents

Description

  The present invention relates to a skin cleanser composition having excellent foam quality, a feeling during rinsing, a good moisturizing feeling after drying, an appropriate viscosity, and good low-temperature stability.

  Skin cleansers are required to have a cleansing feeling and fine foaming in addition to a detergency that removes dirt. In addition, for the purpose of improving handleability and formulation stability, it is required to impart an appropriate viscosity with various thickeners. As the cleaning component to be blended in the skin cleansing agent, fatty acid salts having a carboxyl group in the hydrophilic group, giving a refreshing feeling to washing and having good foaming properties are most widely used. However, when fatty acid salts are used, there are problems such as a squeaky feeling during rinsing and a lack of moisturizing feeling after drying.

  In order to solve this problem, a skin cleansing composition containing a fatty acid salt, a cationic polymer, and an oil, efficiently leaving the oil on the skin, and having a good feel after washing is disclosed (patent) Reference 1). However, in this composition, the oil agent inhibited foaming properties, and the viscosity of the preparation was not sufficient.

  Patent Document 2 discloses a detergent composition containing pentastearic acid POE (150) sorbitol ester as a thickener, and further containing a fatty acid salt and an amphoteric surfactant. This composition had sufficient viscosity and good foaming, but the feeling during rinsing and the moisturizing feeling after drying were not fully satisfactory.

On the other hand, Patent Document 3 discloses a detergent composition containing coconut oil fatty acid diethanolamide, a fatty acid salt, and tetraisostearic acid POE (30) sorbitol as a thickener and having good moisture retention after washing. However, this composition may feel squeezed at the time of rinsing, and the foam quality and low-temperature stability are not sufficiently satisfactory.
Thus, the development of a skin cleanser composition having excellent foam quality, good rinsing feel, good moisturizing feeling after drying, suitable viscosity and good low-temperature stability has not been achieved.

JP 2004-262838 A JP 2012-92064 A JP 2006-96883 A

  In view of the above circumstances, the present invention provides a skin cleanser composition having excellent foam quality, a feeling during rinsing, a good moisturizing feeling after drying, an appropriate viscosity, and good low-temperature stability. It is in.

  As a result of intensive studies, the present inventors have found that the above problem can be solved by blending a higher fatty acid salt, a cationic polymer, an acylalkanolamide, and a specific polyoxyethylene sorbitol oleate in a predetermined ratio. The present invention has been completed.

That is, this invention is a skin cleansing composition shown below.
The following component (A) is 3 to 30% by mass, component (B) is 0.05 to 5% by mass, component (C) is 0.1 to 5% by mass, and component (D) is based on the total amount of the composition. 0.1 to 20% by mass, the mass ratio of component (D) / (A) is 0.05 to 0.8, and the mass ratio of component (D) / (C) is 0.2 to 6. A skin cleansing composition characterized by that.
(A) Higher fatty acid salt (B) Cationic polymer (C) Acyl alkanolamide (D) Polyoxyethylene sorbitol oleate represented by the following general formula (1) Z [O- (EO) _m -R] ₆ Formula (1)
(In the formula, Z is a hydrocarbon residue obtained by removing a hydroxyl group from sorbitol, EO is an oxyethylene group, R is an oleic acid residue or a hydrogen atom, and its esterification rate is 50 to 100%. (The average added mole number of ethylene group is 6 to 15.)

  According to the skin cleanser composition of the present invention, the foam quality is excellent, the feeling at the time of rinsing, the moisturizing feeling after drying is good, it has an appropriate viscosity, and the low temperature stability is also good. .

Hereinafter, embodiments of the present invention will be described.
The skin cleansing composition of the present invention contains the following components (A) to (D). Hereinafter, each component will be described.

[(A) Higher fatty acid salt]
The component (A) used in the present invention is a higher fatty acid salt, which is blended for imparting detergency and foaming power to the skin cleansing composition, and used alone or in combination of two or more. Can do.

The fatty acid constituting the component (A) may be either a saturated fatty acid or an unsaturated fatty acid, may be a linear fatty acid or a branched fatty acid, and may further be a substituted fatty acid having a substituent, for example, a hydroxyl group-substituted fatty acid. Moreover, the mixed fatty acid containing 2 or more types of fatty acids can be used.
The carbon number of the fatty acid is preferably 8-22, more preferably 12-18. Specific examples of fatty acids include caprylic acid, nonanoic acid, decanoic acid, lauric acid, tridecanoic acid, isotridecanoic acid, myristic acid, pentadecanoic acid, palmitic acid, heptadecanoic acid, stearic acid, nonadecanoic acid, behenic acid, dodecenoic acid , Tetradecenoic acid, hexadecenoic acid, palmitooleic acid, oleic acid, vaccenic acid, linoleic acid, linolenic acid, arachidonic acid, isostearic acid, hydroxystearic acid, palm fatty acid, palm kernel oil fatty acid, etc. From the viewpoint of foam quality, lauric acid, myristic acid, palm fatty acid, and palm kernel oil fatty acid are preferred.

  Examples of the counter ion of component (A) include alkali metal ions such as sodium ions and potassium ions, ammonium ions, alkanolamines such as triethanolamine, and amino acids such as arginine and lysine. And potassium ions are preferred.

  Content of a component (A) is 3-30 mass% with respect to the composition whole quantity, Preferably it is 5-20 mass%, More preferably, it is 7-15 mass%. When the amount is less than 3% by mass, the feel, the foam quality and the viscosity at the time of rinsing may be insufficient, and when it exceeds 30% by mass, the low-temperature stability may be deteriorated.

[(B) Cationic polymer]
The component (B) used in the present invention is a cationic polymer, and is blended to give a smooth feel during rinsing and to give a moisturizing feeling after drying. Component (B) forms a complex with component (A) and adsorbs to the skin, thereby improving the feel during rinsing and the moisturizing feeling after drying.
Examples of the cationic polymer include a homopolymer of dialkyl diallylammonium chloride, a copolymer of dialkyl diallylammonium chloride and (meth) acrylate, a copolymer of dialkyl diallylammonium chloride and (meth) acrylate ester, and dialkyl diallyl. Copolymer of ammonium chloride and (meth) acrylamide, polychlorinated methacryloyloxyethyltrimethylammonium chloride, copolymer of vinylimidazolinium trichloride and vinylpyrrolidone, copolymer of hydroxyethylcellulose and dimethyldiallylammonium chloride Polymer, copolymer of vinylpyrrolidone and dimethylaminoethyl methacrylate, cationized cellulose, cationized starch, cationized guar gum, cation Tara gum, cationized locust bean gum, cationized xanthan gum, cationized fenugreek gum, etc. are mentioned, especially cationized cellulose, cationized guar gum, cationized tara gum, homopolymer of dialkyl diallylammonium chloride, dialkyl diallylammonium chloride A copolymer with acrylamide is preferable, and cationized cellulose and cationized guar gum are more preferable.
Note that (meth) acrylate represents acrylate or methacrylate, and (meth) acrylamide represents acrylamide or methacrylamide. Moreover, a component (B) can be used individually by 1 type or in combination of 2 or more types.

The degree of cationization of the cationic polymer can be calculated from the measured value of nitrogen content by Kjeldahl method or the like, preferably 0.2 to 3.0% by mass, more preferably 0.5 to 2%. 0.0% by mass. The degree of cationization can be measured by the method described in the Nitrogen Determination Method of Quasi-drug Raw Material Standard 2006 (Pharmaceutical Daily).
The weight average molecular weight of the cationic polymer can be measured using gel permeation chromatography (GPC), preferably in the range of 100,000 to 3,000,000, more preferably in the range of 400,000 to 2,000,000.

  Specific examples of such cationic polymers include Leogard LP, GP, MGP (manufactured by Lion Corporation), UCARERL-30M, JR-400, JR-30M (manufactured by Dow Chemical Company), Jaguar C ( Sansho Co., Ltd.), Labor Gum CG-M, CG-M7, CG-M8M (Dainippon Sumitomo Pharma Co., Ltd.), N-Hance 3000 (Hercules Japan Co., Ltd.), Marcote (Nalco Japan Co., Ltd.) ) And the like.

  Content of a component (B) is 0.05-5 mass% with respect to the composition whole quantity, Preferably it is 0.1-2 mass%. If it is less than 0.05% by mass, the feel during rinsing may be insufficient, and if it exceeds 5% by mass, the stability of the preparation may be reduced.

[(C) Acylalkanolamide]
The component (C) used in the present invention is an acylalkanolamide, and can be imparted with viscosity by combining with the component (D) shown below at a specific ratio.
As the acylalkanolamide, either monoalkanolamide or dialkanolamide may be used. Preferred are those having an acyl group having 8 to 24 carbon atoms, and more preferred are those having an acyl group having 12 to 18 carbon atoms and a hydroxyalkyl group having 2 to 3 carbon atoms. As the acyl, an acyl group derived from a mixed fatty acid can be used. A component (C) can be used individually by 1 type or in combination of 2 or more types.

Preferred examples of the acylalkanolamide include coconut oil fatty acid monoethanolamide, coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, and lauric acid diethanolamide. Moreover, the adduct of these oxyethylene groups is also mentioned.
Content of a component (C) is 0.1-5 mass% with respect to the composition whole quantity, Preferably it is 0.5-3 weight%. If it is less than 0.1% by weight, the viscosity may be insufficient. If it exceeds 5% by weight, the stability of the preparation may be lowered.

[(D) Polyoxyethylene sorbitol oleate]
Component (D) used in the present invention is a polyoxyethylene sorbitol oleate represented by the general formula (1).
Component (D) can promote the formation of a complex of an anionic surfactant and a cationic polymer, and can improve the feeling during rinsing and the moisturizing feeling after drying. Component (D), when combined with component (C), has the effect of synergistically improving viscosity, and further has the effect of suppressing precipitation of component (A) and component (C) at low temperatures. A component (D) can be used individually by 1 type or in combination of 2 or more types.

Z [O- (EO) _m -R] Formula ₆ (1)

In the general formula (1) of the component (D), Z is a hydrocarbon residue obtained by removing a hydroxyl group from sorbitol.
EO is an oxyethylene group, and the average added mole number m of EO per hydroxyl group is 6 to 15, preferably 8 to 12. M × 6, which is the total number of moles added of EO, is preferably 36 to 90, and more preferably 48 to 72. When m is less than 6, the foam quality is lowered, the feeling during rinsing becomes insufficient, and sufficient viscosity may not be obtained. When m exceeds 15, the feeling during rinsing and the moisturizing feeling after drying may be insufficient, and the amount of foam may be reduced.
R is an oleic acid residue or a hydrogen atom, and the esterification rate is 50 to 100%. In the present invention, R is an oleic acid residue having an unsaturated bond, and if R is a residue of a fatty acid other than oleic acid, a complex of component (A) and component (B) The formation promoting ability may decrease, and the feeling during rinsing and the moisturizing feeling after drying may be insufficient. Further, when R is a residue of a fatty acid other than oleic acid, the low-temperature stability may be lowered.

Here, the esterification rate represents the ratio of the number of hydroxyl groups in which fatty acids are ester-bonded out of the total number of hydroxyl groups of component (D), and the saponification value (SV), hydroxyl value (OHV) of component (D), The acid value (AV) can be measured and calculated by the following method.
Esterification rate = [(SV-AV) / (SV-AV + OHV)] × 100
In addition, SV, AV, and OHV can be measured based on the method of Japanese Industrial Standard (JIS) description.
SV; JIS K-0070 4.1
AV; JIS K-0070 3.1
OHV; JIS K-1557 1

  Component (D) esterification rate is 50 to 100%, preferably 50 to 85%, more preferably 60 to 80%. If it is less than 50%, the feeling during rinsing and the moisturizing feeling after drying may be insufficient, and the viscosity may be insufficient.

  Content of a component (D) is 0.1-20 mass% with respect to the composition whole quantity, Preferably it is 0.5-10 mass%, More preferably, it is 1-5 mass%. If the amount is less than 0.1% by mass, the foam quality, viscosity, and feel improving effect may be insufficient. If the amount exceeds 20% by mass, the feeling improving effect may be lowered.

  The mass ratio (D) / (A) of the component (D) to the component (A) is 0.05 to 0.8, preferably 0.1 to 0.5, more preferably 0.2 to 0.00. 4. Within this range, the component (D) polyoxyethylene sorbitol oleate can promote the formation of a complex of the component (A) and the component (B), and can alleviate squeaking during rinsing. . Moreover, moisture can be given to skin because a component (D) remains in skin after drying. Even if (D) / (A) is less than 0.05 or more than 0.8, the complex-forming ability may be lowered, and the feeling improvement effect may be lowered.

  The mass ratio (D) / (C) of the component (D) to the component (C) is 0.2 to 6, preferably 0.5 to 5, and more preferably 1 to 3. In general, the component (C) has high crystallinity and often precipitates during storage at low temperatures to impair the stability of the preparation. However, the component (C) is precipitated by blending the component (D) in the above ratio. Can be suppressed. When (D) / (C) is less than 0.2, the low-temperature stability may be lowered, and when it exceeds 6, the foam quality may be insufficient.

The skin cleansing composition of the present invention can be appropriately blended with various components generally used in skin cleansing agents within a range not impairing the effects of the present invention, if necessary.
Such components include anionic surfactants, amphoteric surfactants, nonionic surfactants, hydrocarbon oils, ester oils, higher fatty acids, higher alcohols, silicone oils, glycerin, propylene glycol, 1,3 -Moisturizers such as butylene glycol and polyethylene glycol, paraoxybenzoic acid esters, sodium benzoate, preservatives such as phenoxyethanol, chelating agents such as ethylenediaminetetraacetate, edetic acid, pearling agents such as ethylene glycol distearate, paramethoxy Ultraviolet absorbers such as cinnamic acid esters and methoxydibenzoylmethane, thickeners, antioxidants, pH adjusters, plant extracts, amino acids, vitamins, pigments, and fragrances can be appropriately blended.

  The skin cleansing composition of the present invention can be produced according to a conventional method. The dosage form is arbitrary, and can be a transparent liquid, a pearl liquid, a paste, or a gel, but a transparent or pearl liquid is particularly preferable.

  Hereinafter, the present invention will be described more specifically with reference to Examples and Comparative Examples.

<Examples 1-7 and Comparative Examples 1-7>
A skin cleansing composition containing the components shown in Table 2 in a predetermined ratio and further containing the components shown in Table 1 as common addition components was prepared by the following method.

<Preparation method>
Ingredients (A) to (D) [or (D ′)] and the commonly added ingredients are mixed at 80 ° C. until the ratio shown in Tables 1 and 2 becomes uniform, cooled to room temperature, and liquid A skin cleanser composition was obtained.

<Evaluation method>
(A) Feel at the time of rinsing Each of the 5 panelists used the skin cleansing compositions of the examples and comparative examples, and the panelists felt the feeling at the time of rinsing when the forearm abdomen was washed with tap water at 40 ° C. Was evaluated on a five-point scale according to the following evaluation criteria and given a score. The average score of five panelists is 3.0 or higher as “◎”, 2.0 or higher and lower than 3.0 as “◯”, 1.0 or higher and lower than 2.0 as “△”, and less than 1.0. Indicated in Table 2 as “x”. However, when two or more panelists gave a score of 0, it was written as “x” regardless of the average value of the evaluation.
4: Judged to have a very smooth feel.
3: Judged to have a smooth feel.
2: Although it is smooth, it is judged that it is slightly slim.
1: Judged to have a slightly crisp feel.
0: Judged as a very crisp feel.

(B) Moisturizing feeling after drying The above (a) was evaluated, and after towel drying, each panelist evaluated the moisturizing feeling of the skin for 30 minutes according to the following evaluation criteria, and gave a score. The average score of five panelists is 3.0 or higher as “◎”, 2.0 or higher and lower than 3.0 as “◯”, 1.0 or higher and lower than 2.0 as “△”, and less than 1.0. Indicated in Table 2 as “x”. However, when two or more panelists gave a score of 0, it was written as “x” regardless of the average value of the evaluation.
4: Judged that the skin was very moist.
3: Judged that skin is moistened.
2: Moist but determined to be a little bitter.
1: The skin is not moisturized.
0: Judged that the skin was dry.

(C) Foam quality In the evaluation of (a) above, each panelist evaluated the foam quality when foamed with tap water at 40 ° C., and gave a score. The average score of five panelists is 3.0 or higher as “◎”, 2.0 or higher and lower than 3.0 as “◯”, 1.0 or higher and lower than 2.0 as “△”, and less than 1.0. Indicated in Table 2 as “x”. However, when two or more panelists gave a score of 0, it was written as “x” regardless of the average value of the evaluation.
4: Judged that very fine bubbles were formed.
3: It was judged that fine bubbles were formed and the amount of bubbles was appropriate.
2: Although fine bubbles are formed, it is determined that the amount of bubbles is slightly small.
1: It is determined that a slightly coarse bubble is formed.
0: Judged that foam quality is coarse.

(D) Viscosity Each panelist evaluated the dripping at the time of application | coating at the time of performing evaluation of said (a), and gave the rating. The average score of five panelists is 3.0 or higher as “◎”, 2.0 or higher and lower than 3.0 as “◯”, 1.0 or higher and lower than 2.0 as “△”, and less than 1.0. Indicated in Table 2 as “x”. However, when two or more panelists gave a score of 0, it was written as “x” regardless of the average value of the evaluation.
4: Judged that there was no dripping at the time of application and that it was easy to adjust to the skin 3: Judged that there was almost no dripping.
2: Although it does not sag, it is determined that it is difficult to adjust to the skin.
1: Judged that there was some dripping.
0: Judged as dripping and difficult to adjust to skin.

(E) Low-temperature stability 50 g of the composition was put into a 100 mL screw tube and the appearance when it was allowed to stand for 1 month in a thermostatic bath at 5 ° C. was visually observed and judged according to the following criteria.
○: Precipitation and cloudiness do not occur, and it is transparent.
Δ: There is a fluorescent color.
X: Crystals are precipitated and cloudy.

  From the results of Examples 1 to 7, all of the skin cleanser compositions of the present invention are excellent in foam quality, have a good feeling during rinsing and a good moisturizing feeling after drying, have an appropriate viscosity, and are stable at low temperatures. The property was also good.

In Comparative Example 1, since component (D) was not blended, the feeling during rinsing, the moisturizing feeling after drying, and the foam quality were poor. Moreover, although sufficient viscosity was obtained with coconut oil fatty acid diethanolamide, crystal precipitation occurred during storage at low temperature.
In Comparative Example 2, the component (C) was not blended, and foam quality and viscosity were not sufficient.
In Comparative Example 3, since the mass ratio (D) / (A) exceeded 0.8, the feeling at the time of rinsing was poor, and the moisturizing feeling after drying and the foam quality were not sufficient.

In Comparative Example 4, the number of moles EO added m of the component (D ′) is less than 6, the esterification rate is also less than 50%, and Z is a glycerin residue, so that the feel and viscosity during rinsing are poor, The moisturizing feeling and foam quality after drying were not sufficient.
In Comparative Example 5, since m of the component (D ′) was less than 6, the viscosity was poor, and the feeling during rinsing, the moisturizing feeling after drying, and the foam quality were not sufficient.
In Comparative Example 6, since the component (D ′) is an isostearic acid ester, the feeling at the time of rinsing was not sufficient, and the low-temperature stability was not sufficiently satisfactory.
In Comparative Example 7, since m of component (D ′) exceeds 15, the viscosity is obtained, but the feeling at the time of rinsing and the moisturizing feeling after drying are poor, and the foam quality and low-temperature stability are also good. It was not satisfactory enough.

Claims (1)

The following component (A) is 3 to 30% by mass, component (B) is 0.05 to 5% by mass, component (C) is 0.1 to 5% by mass, and component (D) is based on the total amount of the composition. 0.1 to 20% by mass, the mass ratio of component (D) / (A) is 0.05 to 0.8, and the mass ratio of component (D) / (C) is 0.2 to 6. A skin cleansing composition characterized by that.
(A) Higher fatty acid salt (B) Cationic polymer (C) Acyl alkanolamide (D) Polyoxyethylene sorbitol oleate represented by the following general formula (1) Z [O- (EO) _m -R] ₆ Formula (1)
(In the formula, Z is a hydrocarbon residue obtained by removing a hydroxyl group from sorbitol, EO is an oxyethylene group, R is an oleic acid residue or a hydrogen atom, and its esterification rate is 50 to 100%. (The average added mole number of ethylene group is 6 to 15.)