JP2002265351A - Skin cleaner - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a stable skin cleaner excellent in operability and a feeling when used, and having a massage effect. SOLUTION: This skin cleaner contains higher fatty acids comprising higher fatty acid and its alkali metal salt and water, and further satisfies the following requirements (A) to (D): (A) the higher fatty acids mainly contain satiric acid and its alkali metal salt; (B) the higher fatty acids are contained in an amount of 5-30 wt.% based on the total amount of the skin cleaner; (C) the higher fatty acid alkali metal salt is contained in an amount of 35-70 wt.% based on the total amount of the higher fatty acids; and (D) the higher fatty acid alkali metal salt comprises a mixture of higher fatty acid potassium salt and higher fatty acid sodium salt.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a skin cleanser. More specifically, the present invention relates to a skin cleansing agent having excellent operability and feel when used, having a massage effect, and having good stability.

[0002]

2. Description of the Related Art Surfactants such as facial cleansers mainly comprise surfactants containing a relatively large amount of a surfactant. A typical surfactant type is a cleansing foam, which has a soft creamy appearance and is used after a small amount of water is added to a palm and foamed.

Conventionally, a surfactant-type skin cleansing agent is a creamy skin cleansing agent containing a higher fatty acid soap as a main component, and usually contains a fatty acid soap such as a higher fatty acid potassium salt as a main component. It has been practiced to ensure the storage stability and the high-temperature stability by using a fatty agent and the like.

Recently, as a development of a creamy skin cleanser which is excellent in foaming power and gives a good feeling without giving a feeling of squeak and firmness to the skin after rinsing, it contains lauric acid, myristic acid and palmitic acid. 15 to 45% by weight of higher fatty acids substantially free of fatty acids having 18 or more carbon atoms;
A cream containing potassium hydroxide corresponding to 75 to 90% by weight of the completely neutralized amount of all higher fatty acids, and a blending amount of palmitic acid being 3 to 20% by weight in the whole composition. A skin cleansing agent is disclosed (Japanese Patent Laid-Open No.
No. 182419). However, when used, the creamy skin cleanser is diluted with water before use, and in terms of usability, it has a conventional cream feeling.

[0005] In addition, some sherbet-like products with different feelings of use have appeared on the market, which can be easily used. However, none of these sherbet-like skin cleansing agents have sufficient usability and product stability.

[0006]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a stable skin cleanser which has excellent use operability and use feel and has a massage effect. .

[0007]

Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, they have higher fatty acid soap, higher fatty acid and water as main components, and determine the types and content ratio of these components. The inventors have found that the above-mentioned problems can be solved by making the specific structure, and have completed the present invention.

That is, the present invention comprises a higher fatty acid comprising a higher fatty acid and an alkali metal salt thereof and water,
And a skin cleanser comprising the following (A) to (D). (A) The higher fatty acids constituting the higher fatty acids mainly include stearic acid and alkali metal salts thereof (hereinafter, referred to as stearic acids). (B) The content of higher fatty acids is 5 to 3 in the total amount of the skin cleanser.
0% by weight. (C) The content of the alkali metal salt of the higher fatty acid is 35 to 70% by weight in the higher fatty acids. (D) The alkali metal salt of a higher fatty acid is a mixture of a higher fatty acid potassium salt and a higher fatty acid sodium salt.

The content of stearic acid in higher fatty acids is preferably at least 80% by weight.

[0010] In the total alkali metal salt of higher fatty acid, the content of potassium salt is preferably 5 to 30% by weight, and the content of sodium salt is preferably 70 to 95% by weight.

[0011] The skin cleanser of the present invention has a sherbet shape unlike a cream shape.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail.

In the present invention, higher fatty acids comprising higher fatty acids and alkali metal salts thereof are contained. The higher fatty acids mainly contain stearic acid, and the content thereof is preferably 80% by weight or more in the higher fatty acids. Other higher fatty acids constituting higher fatty acids include palmitic acid, myristic acid, lauric acid, oleic acid, isostearic acid and the like.

The content of higher fatty acids used in the present invention is 5 to 30% by weight based on the total amount of the skin cleanser. Preferably, it is 7 to 20% by weight. When the content of the higher fatty acid is less than 5% by weight, the skin cleanser is too soft, and when the content exceeds 30% by weight, the skin cleansing agent becomes too hard, and in any case, the operability in use is deteriorated.

In the present invention, the content of the alkali metal salt of the higher fatty acid is 35 to 70% by weight in the higher fatty acid.
And more preferably 40 to 65% by weight. If the content is less than 35% by weight or more than 70% by weight,
A sherbet-like skin cleansing agent cannot be obtained, and a feeling of use such as a unique refreshing feeling (cool feeling) of the present invention and a massage effect cannot be obtained.

The alkali metal salt of a higher fatty acid may be blended as a salt, but the higher fatty acid may be reacted with potassium hydroxide and sodium hydroxide during the process of producing a skin cleanser, which is more efficient. It is a target.

In the present invention, the counter ion of the alkali metal salt of a higher fatty acid is a potassium salt or a sodium salt. The content ratio of the higher fatty acid potassium salt and the higher fatty acid sodium salt is preferably such that the potassium salt is 5 to 30% by weight and the sodium salt is 70 to 95% by weight in the alkali metal salt of the total higher fatty acid. More preferably, the potassium salt is 10 to 25% by weight and the sodium salt is 75 to 90% by weight. If the content of the potassium salt is less than 5% by weight (the content of the sodium salt exceeds 95% by weight), it is too hard. On the other hand, if the content of the potassium salt exceeds 30% by weight (the content of the potassium salt is less than 70% by weight), it is unfavorably too soft.

The content of water in the present invention is preferably 50 to 95% by weight based on the total amount of the skin cleanser. More preferably, it is 60 to 90% by weight based on the total amount of the skin cleanser.

The skin cleansing composition of the present invention contains, in addition to the above-mentioned essential components, other components usually used in skin cleansing compositions, such as surfactants, moisturizing agents, emollients other than the essential components of the present invention. A scrub agent or the like can be appropriately added as needed within a range that does not impair the effects of the present invention.

Specific examples of surfactants other than the above essential components include, for example, sorbitan monooleate, sorbitan monoisostearate, and sorbitan monolaurate.
Sorbitan monopalmitate, sorbitan monostearate, sorbitan sesquioleate, sorbitan trioleate and other sorbitan fatty acid esters, glycerin sesquioleate, glyceryl monostearate,
Glycerin polyglycerin fatty acid esters such as polyglycerin distearate, propylene glycol fatty acid esters such as propylene glycol monostearate, hydrogenated castor oil derivatives, glycerin alkyl ether, POE sorbitan monooleate, POE POE sorbitan fatty acid esters such as sorbitan monostearate, POE sorbit monolaurate, POE sorbit monooleate, POE sorbit pentaoleate
POE sorbite fatty acid esters such as POE sorbitol monostearate, POE glycerin monostearate, POE glycerin monoisostearate, POE
POE glycerin fatty acid esters such as E-glycerin triisostearate,

POE monooleate, POE monostearate, POE distearate, POE monodioleate
POE fatty acid esters such as ethylene glycol distearate, POE lauryl ether, POE oleyl ether, POE stearyl ether, POE behenyl ether, POE2-octyl dodecyl ether, PE
POE alkyl ethers such as OE cholesterol ether; Pluronics such as Pluronic (polyoxyethylene / polyoxypropylene glycol);
POE / POP alkyl ethers such as POP cetyl ether, POE / POP2-decyltetradecyl ether, POE / POP monobutyl ether, POE / POP hydrogenated lanolin, POE / POP glyceryl ether, and tetronics , POE castor oil, POE hardened castor oil, POE hardened castor oil monoisostearate, PO
POE castor oil such as E-hardened castor oil triisostearate, hardened castor oil derivative, coconut oil fatty acid diethanolamide, lauric acid monoethanolamide, alkanolamide such as fatty acid isopropanolamide, sucrose fatty acid ester, alkyl glucoside, etc. Is mentioned. One or more of these surfactants can be arbitrarily selected and blended.

Specific examples of the humectant include, for example, polyethylene glycol, glycerin, 1,3-butylene glycol, isoprene glycol, erythritol,
Examples include sorbitol, xylitol, maltitol, propylene glycol, dipropylene glycol, diglycerin, sodium pyrrolidonecarboxylate, lactic acid, and sodium lactate. One or more of these humectants can be arbitrarily selected and blended.

Specific examples of emollients include higher alcohols such as lauryl alcohol, cetyl alcohol, stearyl alcohol, behenyl alcohol, myristyl alcohol, and cetostearyl alcohol.
, Avocado oil, corn oil, olive oil, rapeseed oil, evening primrose oil, castor oil, sunflower oil, teaseed oil, rice bran oil, jojoba oil, cacao oil, coconut oil, squalane, tallow, mokuro, beeswax, candelilla wax, Examples include carnauba wax, whale wax, lanolin, silicone oil (dimethylpolysiloxane, methylphenylpolysiloxane, etc.), oils such as liquid paraffin, ceresin, petrolatum, and the like. One or two or more of these emollients can be arbitrarily selected and blended.

Specific examples of the scrub agent include, for example, powder components such as titanium dioxide, mica, talc, kaolin and silica. These scrubs are
One or more kinds can be arbitrarily selected and blended.

In addition, a viscosity modifier, a sequestering agent, a preservative, a medicine, a fragrance, a coloring matter, and the like can be appropriately added as needed within a range not to impair the effects of the present invention.

In preparing the skin cleanser of the present invention, higher fatty acids, alkali metal salts of higher fatty acids, water and other optional components may be added and mixed. It is common and efficient to mix and carry out a neutralization reaction during production to prepare an alkali metal salt of a higher fatty acid.

The skin cleanser of the present invention is used as a facial cleanser, soap and the like. The dosage form is in the form of a sherbet. The method of use is not particularly limited, but, for example, a method in which a cleansing agent is applied to a face or the like by hand, rubbed sufficiently against the skin while massaging, and then washed off with water is used. Also, after attaching it to the face etc. like a pack cosmetic,
A method of washing off with water while massaging can also be used.

A preferred embodiment of the present invention is a skin cleanser comprising higher fatty acids and water and comprising the following (A) to (D). (A) 80% by weight or more of stearic acid is contained in higher fatty acids. (B) The content of higher fatty acids is 5 to 3 in the total amount of the skin cleanser.
0% by weight. (C) The content of the alkali metal salt of the higher fatty acid is 35 to 70% by weight in the higher fatty acids. (D) 5-30% by weight of alkali metal salt of higher fatty acid
Of a higher fatty acid potassium salt and 70 to 95% by weight of a higher fatty acid sodium salt.

A still more preferred embodiment is a skin cleanser comprising higher fatty acids and water and comprising the following (A) to (D). (A) Contains 90% by weight or more of stearic acids in higher fatty acids. (B) The content of higher fatty acids is 7 to 2 in the total amount of the skin cleanser.
0% by weight. (C) The content of the alkali metal salt of the higher fatty acid is 40 to 65% by weight in the higher fatty acids. (D) The alkali metal salt of a higher fatty acid is a mixture of 10 to 25% by weight of a higher fatty acid potassium salt and 75 to 90% by weight of a higher fatty acid sodium salt. According to these combinations, particularly excellent effects can be obtained.

[0030]

The present invention will be specifically described below with reference to examples. The compounding amount is% by weight. All other percentages are by weight unless otherwise specified. Prior to the description of the examples, the effect test method used in the present invention will be described.

(1) Sensory test method Usability (operability at the time of use), feel of use (contact with skin,
For each of the evaluation items of the refreshing feeling and the massage effect, each person was given a score based on the following evaluation criteria based on the use test of a 10-person specialized panel. Then, the scores given by each person were totaled and evaluated based on the following evaluation criteria.

(Evaluation Point Criteria) 5 points: Excellent. 4 points: Excellent. 3 points: Normal. 2 points: poor. 1 point: very poor. (Evaluation criteria) A: The total score is 40 points or more. ：: The total score is 30 or more and less than 40 points. Δ: The total score is 20 or more and less than 30. X: The total score is less than 20 points.

(2) Stability test method Samples were stored at -5 ° C and 40 ° C for 5 days, and the separated state after storage was visually determined. (Evaluation criteria) ：: No change at all at -5 ° C and 40 ° C. ：: There is almost no change in storage at both -5 ° C and 40 ° C. ×: Some change was observed in either storage at -5 ° C or 40 ° C.

(Examples 1 to 8, Comparative Examples 1 to 7) Tables 1 and 2
Was prepared as follows.
A: Components 1 to 5 are mixed and heated and dissolved at 80 ° C.
B; Add components 6 to 8 gently to A. C: While stirring and cooling, add Component 9 at 50 ° C and cool to 35 ° C. Further, an evaluation test was performed on the obtained skin cleanser, and the results are shown in Tables 1 and 2 above.

[0035]

[Table 1]

As can be seen from Table 1, in Examples 1 to 8 in which each component was blended in an appropriate amount, usability (operability), use feeling (touch on skin), use feeling (coolness), and massage effect In each case, excellent effects were obtained.

[0037]

[Table 2]

As can be seen from Table 2, Comparative Examples 1 and 2 in which the amount of the higher fatty acid is not an appropriate amount show usability (operability), feel (use on skin), feel (coolness), Inferior in massage effect and stability (Comparative Example 1), usability (operability), use feel (touch to skin),
It can be seen that the use feeling (cool feeling) and the massage effect are inferior (Comparative Example 2). In addition, in the observation when the stability evaluation of Comparative Example 2 was performed, the cleaning material was in a polished state. Comparative Example 3 in which the amount of the higher fatty acid salt is not an appropriate amount,
No. 4 is inferior in usability (operability), use feeling (touch to skin), massage effect (Comparative Example 3), usability (operability), use feeling (touch to skin), massage effect It turns out that it is inferior (Comparative Example 4).

(Examples 9 to 10, Comparative Examples 5 to 7) Skin cleansers having the formulations shown in Table 3 were produced according to the method shown in Table 1. Further, an evaluation test was performed on the obtained skin cleanser, and the results are shown in Table 3 above.

[0040]

[Table 3]

As can be seen from Table 3, as the higher fatty acids, Examples 9 and 10 in which palmitic acid and myristic acid were used in place of stearic acid for 20% by weight of the total amount of higher fatty acids were used (operability). Excellent effects were obtained in all of the use feeling (touch to the skin), the use feeling (cool feeling), the massage effect, and the stability.

On the other hand, Comparative Example 5 in which lauric acid was used as the fatty acid showed usability (operability), use feeling (touch on skin), use feeling (coolness), massage effect,
It turns out that it is inferior to all stability. Also, 30% by weight of the total amount of higher fatty acids is replaced with stearic acid, palmitic acid,
Comparative Examples 6 and 7, which were replaced with myristic acid, were inferior in usability (operability), feel in use (touch to skin), massage effect, stability (Comparative Example 6), usability (operability), Inferior in use feeling (touch to skin), use feeling (cool feeling), massage effect, and stability (Comparative Example 7)
You can see that

Hereinafter, the formulation of the skin cleanser of the present invention will be shown as examples. The production was performed according to the method shown in Table 1. In addition, when the above-mentioned evaluation ability test was performed on these skin cleansers, all were excellent.

Example 11 Components Compounding Amount (% by Weight) (1) Stearic acid 12.0 (2) Myristic acid 3.0 (3) Polyethylene glycol 1500 8.0 (4) Methylpolysiloxane 5.0 ( 5) Decaglyceryl tristearate 1.0 (6) KOH (10% aqueous solution) 0.78 (7) NaOH (10% aqueous solution) 10.50 (8) Silica 0.75 (9) Dye appropriate amount (10) Paraben Appropriate amount (11) Fragrance Appropriate amount (12) Purified water residue

Example 12 Ingredients Compounding Amount (% by Weight) (1) Stearic acid 16.0 (2) Myristic acid 4.0 (3) 1,3-butylene glycol 5.0 (4) 3-methyl- 1,3-butanediol 5.0 (5) Squalane 1.5 (6) Self-emulsifying glyceryl monostearate 1.5 (7) KOH (10% aqueous solution) 1.84 (8) NaOH (10% aqueous solution) 15.77 (9) Dye appropriate amount (10) Paraben appropriate amount (11) Flavor appropriate amount (12) Purified water residue

Example 13 Ingredients Compounding Amount (% by Weight) (1) Stearic Acid 12.0 (2) Concentrated Glycerin 7.0 (3) Cetostearyl Alcohol 1.0 (4) Tri-2-ethylhexane Glyceryl acid 2.0 (5) POE / POP glyceryl ether 1.0 (6) KOH (10% aqueous solution) 2.13 (7) NaOH (10% aqueous solution) 8.62 (8) Dye appropriate amount (9) Paraben appropriate amount (10) Fragrance appropriate amount (11) Purified water residue

Example 14 Components Compounding Amount (% by Weight) (1) Stearic acid 10.0 (2) Polyethylene glycol 1500 3.0 (3) Sodium pyrrolidonecarboxylate 5.0 (4) Methylpolysiloxane 0 (5) Methylphenylpolysiloxane 1.0 (6) POE lauryl ether 1.5 (7) KOH (10% aqueous solution) 0.89 (8) NaOH (10% aqueous solution) 5.71 (9) Dye appropriate amount (10) Paraben appropriate amount (11) Flavor appropriate amount (12) Purified water residue

Example 15 Ingredients Compounding amount (% by weight) (1) Stearic acid 16.0 (2) 1,3-butylene glycol 2.0 (3) Sorbitol (70%) 10.0 (4) Squalane 3.0 (5) Self-emulsifying glyceryl monostearate 0.5 (6) Sorbitan trioleate 1.0 (7) KOH (10% aqueous solution) 1.74 (8) NaOH (10% aqueous solution) 9.92 (9) Dye appropriate amount (10) Paraben appropriate amount (11) Flavor appropriate amount (12) Purified water residue

[0049]

As described in detail above, according to the present invention,
Has excellent operability with moderate hardness when used,
A skin cleanser having a good feeling, a cool feeling (cool feeling), a massage effect, and good stability can be obtained.

Claims (4)

[Claims] Claims 1. A higher fatty acid comprising a higher fatty acid and an alkali metal salt thereof and water, and the following (A) to
(D) A skin cleanser characterized by comprising: (A) The higher fatty acids mainly contain stearic acid and its alkali metal salt. (B) The content of higher fatty acids is 5 to 3 in the total amount of the skin cleanser.
0% by weight. (C) The content of the alkali metal salt of the higher fatty acid is 35 to 70% by weight in the higher fatty acids. (D) The alkali metal salt of a higher fatty acid is a mixture of a higher fatty acid potassium salt and a higher fatty acid sodium salt. 2. The skin cleanser according to claim 1, wherein the content of stearic acid and its alkali metal salt in the higher fatty acids is 80% by weight or more. 3. The skin cleanser according to claim 1, wherein the content of potassium salt is 5 to 30% by weight and the content of sodium salt is 70 to 95% by weight based on the total amount of the alkali metal salts of higher fatty acids. . 4. The skin cleanser according to claim 1, which is a sherbet-like skin cleanser.