JP3811168B2 - Skin cleanser composition - Google Patents

Description

  The present invention has high foamability and creamy foam quality, is excellent in cleansing and rinsing properties, is hypoallergenic to the skin, gives a moist feeling to the washed skin, and also has stability over time. It relates to a good skin cleanser composition.

  2. Description of the Related Art Conventionally, fatty acid soap skin cleansers that are inexpensive, have high cleanability, and have good foaming properties have been used as skin cleansers such as facial cleansers. And as the raw material, fatty acids obtained by hydrolyzing mainly beef tallow, coconut oil, palm oil and palm kernel oil which are natural animal and plant oils and fats (main components are saturated fatty acids and unsaturated fatty acids having 8 to 18 carbon atoms) ) Is used.

  Among fatty acid soaps that are often used in skin cleansers that use fatty acid soap as the main cleaning base, relatively short chain length lauric acid (carbon number 12) and myristic acid (carbon number 14) have a low craft point. Although it has good solubility in water, it has drawbacks such as a feeling of tension in the washed skin. Long chain length palmitic acid (16 carbon atoms) and stearic acid (18 carbon atoms) are mild to the skin, but have a high Kraft point and therefore low solubility in water and slightly poor foaming properties. There is a drawback.

  In consideration of the characteristics of these fatty acids, a detergent composition with improved foamability, safety, and feeling in use has been studied, but it is still not sufficient and a more improved detergent composition. Things are desired.

On the other hand, fatty acids having 20 or more carbon atoms are hardly used as cleaning bases because of their low solubility in water and insufficient foaming and foaming properties, but the following proposals are seen. For example, in order to improve the transparency of solid soap, a transparent solid soap containing 0.5 to 6.0% by weight of a straight-chain saturated fatty acid having 20 to 26 carbon atoms in the total fatty acid (Patent Document 1); behenic acid and A pearly luster dispersion having good storage stability, containing 5 to 30% by weight of behenate (Patent Document 2); in order to stabilize the color tone of the skin cleansing composition containing clay mineral, 20 carbon atoms A skin cleanser composition containing 0.05 to 5% by weight of the above saturated fatty acid (Patent Document 3); a specific higher fatty acid soap and condensed ricinoleic acid to improve stability at low and high temperatures Skin cleansing composition containing polyglycerin ester (Patent Document 4); Hair conditioning shampoo composition containing 0.5 to 20% by weight of a long chain fatty acid having 18 to 36 carbon atoms (Patent Document 5); Behenic acid soap 3 ~ 1 Solid cast composition containing by weight% (Patent Document 6) have been studied.
JP 59-75999 A Japanese Patent Laid-Open No. 10-226798 JP-A-1-149715 JP 2002-68961 A JP-A-5-255049 International Publication No. 92/19712 Pamphlet

  The object of the present invention is to have high foamability and creamy foam quality, excellent cleaning and rinsing properties, low irritation to the skin, imparting a moist feeling to the washed skin, and stable over time The object is to provide a skin cleansing composition having good properties.

  The present inventor uses a fatty acid having 20 to 24 carbon atoms in a specific ratio in a fatty acid composition constituting a fatty acid and a salt thereof, and has a specific ratio of a fatty acid having 15 or less carbon atoms and a fatty acid having 16 or more carbon atoms. By doing so, it was found that the above-mentioned purpose was achieved.

The present invention contains a total of 20 to 50% by mass of fatty acids and salts thereof, and 20 to 70% by mass of water, the degree of neutralization of fatty acids is 60 to 100%, and the composition of the fatty acids constituting the carbon number 20-24 fatty acids are 10 to 30 mass% in the total fatty acids, the weight ratio of having 15 or less of a fatty acid and having 16 or more of the fatty acid carbon carbon 20: 80-50: 50, a liquid, creamy or A paste-like skin cleansing composition is provided.

  The skin cleanser composition of the present invention has high foamability and creamy foam quality, is excellent in cleansing and rinsing properties, is hypoallergenic, gives a moist feeling after washing, and also has stability over time. It is good.

The skin cleansing composition of the present invention contains a fatty acid and a salt thereof, and those having 8 to 24 carbon atoms are used as the fatty acid constituting these.
Examples of the counter ion constituting the fatty acid salt include alkali metals such as sodium and potassium, basic amino acids, and organic amines. Of these, alkali metal salts are preferred, and potassium salts are particularly preferred.
Further, the neutralization degree of the fatty acid is preferably 60 to 100%, particularly 65 to 95%, and more preferably 70 to 90% in terms of foamability and stability over time.

  1 type or more can each be used for a fatty acid and its salt, and 20-50 mass% in the whole composition, Preferably it is 20-45 mass%, More preferably, it contains 20-40 mass%. If it is less than 20% by mass, the foamability and foam quality are deteriorated, and if it exceeds 50% by mass, the skin after washing may have a tight feeling.

  In the present invention, the composition of the fatty acids constituting them is 10 to 30% by mass, preferably 12 to 28% by mass, particularly preferably 15 to 25% by mass of the fatty acids having 20 to 24 carbon atoms in the total fatty acids. It is. If the amount is less than 10% by mass, there is a feeling of tightness, the skin after washing cannot be given a moist feeling, and the stability over time is also deteriorated. Moreover, when it exceeds 30 mass%, foamability and foam quality will worsen.

  As the fatty acid having 20 to 24 carbon atoms, a linear saturated fatty acid having 20 to 24 carbon atoms is preferable, and examples thereof include arachidic acid (20 carbon atoms), behenic acid (22 carbon atoms), lignoceric acid (24 carbon atoms) and the like. One or more of these are used. In particular, arachidic acid and behenic acid are preferable.

Usually, animal and vegetable oils and fats such as beef tallow, palm oil, palm kernel oil, and castor oil used as fatty acids in fatty acid soap-based cleaning compositions contain almost no fatty acids having 20 to 24 carbon atoms. In coconut oil and olive oil, arachidic acid is present in a trace amount of 1% by mass or less, and in rapeseed oil and peanut oil, arachidic acid and behenic acid are present in an amount of about 1 to 3% by mass.
These long-chain fatty acids may be applied as an improvement in the stability of emulsion compositions such as cream (Japanese Patent Laid-Open No. 56-18908) or as a pearly luster imparting agent (Japanese Patent Laid-Open No. 10-226798). However, it is hardly applied as a material for a skin cleansing composition. In addition, as described above, the effect when a large amount of highly lipophilic long-chain fatty acids having 20 to 24 carbon atoms is contained in the fatty acid soap as the main cleaning base has not been known so far. .

  Moreover, in this invention, the composition of the fatty acid which comprises a fatty acid and its salt has a mass ratio of a fatty acid having 15 or less carbon atoms and a fatty acid having 16 or more carbon atoms of 20:80 to 50:50, preferably 25: It is 75-45: 55, Most preferably, it is 30: 70-40: 60. When the ratio of the fatty acid having 15 or less carbon atoms is less than 20:80, sufficient foaming property cannot be obtained, and when it exceeds 50:50, the skin after washing has a feeling of tightness and the stability with time deteriorates.

Preferred examples of the fatty acid having 15 or less carbon atoms include lauric acid and myristic acid.
Moreover, as fatty acids having 16 or more carbon atoms, fatty acids constituting the fatty acids having 20 to 24 carbon atoms and salts thereof are also included. In addition, palmitic acid, stearic acid, isostearic acid, oleic acid, and the like can be mentioned. Palmitic acid and stearic acid are particularly preferable.

  The skin cleansing composition of the present invention may further contain glycols or glycol ethers. Specifically, ethylene glycol, propylene glycol, 1,3-butylene glycol, diethylene glycol, dipropylene glycol, isoprene glycol, polyethylene glycol (average molecular weight 2000 or less), polypropylene glycol (average molecular weight 1500 or less), diethylene glycol monoethyl ether, etc. In particular, dipropylene glycol and diethylene glycol monoethyl ether are preferable.

  One or more kinds of these glycols or glycol ethers can be used, and 3 to 30% by mass, particularly 5 to 25% by mass of the total composition is contained in addition to foamability, stability and production. From the viewpoint of solubility of fatty acids having 20 to 24 carbon atoms and salts thereof at the time.

  The skin cleansing composition of the present invention may further contain a polyhydric alcohol having 3 or more hydroxyl groups in the molecule. Specific examples include glycerin, sorbitol, mannitol, erythritol, xylitol, maltitol, trehalose, sucrose, polyglycerin, and the like, and glycerin, sorbitol, erythritol, and xylitol are particularly preferable.

  These polyhydric alcohols can use 1 or more types, and can also use together with the said glycols or glycol ethers. These are preferably contained in the total composition in an amount of 3 to 30% by mass, particularly 5 to 28% by mass from the viewpoint of reducing the feeling of firmness and moisturization after washing.

  The skin cleansing composition of the present invention preferably contains 20 to 70% by mass of water, particularly 25 to 60% by mass, and more preferably 30 to 50% by mass.

  In the skin cleanser composition of the present invention, in addition to the above components, components used in normal cleanser compositions, for example, surfactants other than fatty acid salts, moisturizers, oil components, bactericides, anti-inflammatory agents, Preservatives, chelating agents, thickeners, salts, pearling agents, scrub agents, fragrances, cooling agents, pigments, ultraviolet absorbers, antioxidants, plant extracts and the like can be included.

The skin cleansing composition of the present invention can be produced by mixing each component, and can be in any form of liquid , cream or paste . From the viewpoint of usability, it is preferable to use a cream or paste. Further, it can be applied as a facial cleanser, makeup remover, body shampoo, hand soap and the like.

Examples 1-7, Comparative Examples 1-5
A skin cleanser composition having the composition shown in Table 1 was prepared by mixing each component, and foaming property, foam quality, rinsing property, irritation, moist feeling after washing, cleaning property and stability over time were evaluated. did. The results are also shown in Table 1. In Table 1, the degree of neutralization of fatty acids is 80% of all fatty acids.

(Evaluation methods)
(1) Foaming properties, foam quality, rinsing properties, irritation, moist feeling after washing:
Ten professional panels conducted facial cleansing tests using each composition. Foaming properties (ease of foaming and amount of foam), foam quality (creamy feeling and elasticity), rinsing properties (good foaming and non-nulling) ), Irritation (tuckiness, lack of bulkiness) and moist feeling after washing were sensory evaluated and determined according to the following criteria for sensory evaluation.
(Sensory evaluation criteria)
Eight out of 10 professional panelists rated it as good:
Out of 10 professional panels, 6-7 were rated good:
Out of 10 professional panels, 4 to 5 were rated as good:
3 out of 10 expert panels rated it as good: ×

(2) Detergency:
After applying 5 mg of lipstick having a composition similar to sebaceous gland lipids to the area of 3 cm × 5 cm on the inner side of the forearm, leaving it for 30 minutes, it was massaged using 1 g of each composition in Table 1 to remove dirt for 30 seconds. . After rinsing with water, the determination was made according to the following criteria for detergency. The lipstick has a composition of 60% by mass of ester oil, 20% by mass of wax, 10% by mass of cholesterol ester, and 10% by mass of coloring material.
(Cleanability criteria)
There is no leftover: ◎
Almost nothing left behind: ○
Somewhat left behind: △
Almost no fall: ×

(3) Stability over time:
Each composition was filled in a plastic container with a lid having a capacity of 120 mL and allowed to stand at 5 ° C. and 40 ° C. for 1 month, and then the state thereof was visually observed and judged according to the following stability criteria.
(Time stability criteria)
No change: ◎
Slight change but no problem for practical use: ○
There is some oozing or agglomeration: △
There is separation or agglomeration: ×

Example 8 (face wash)
A face wash having the composition shown below was produced by mixing each component.
Fatty acids and salts thereof are 33.6% by mass, the proportion of fatty acids having 20 to 24 carbon atoms in all fatty acids is 20% by mass, and the mass ratio of fatty acids having 15 or less carbons: fatty acids having 16 or more carbons = 35: 65. Moreover, the neutralization degree of a fatty acid is 80% of the total fatty acid.

(component)
Lauric acid 2.5 (mass%)
Myristic acid 8.0
Palmitic acid 6.0
Stearic acid 7.5
Arachinic acid 1.0
Behenic acid 5.0
Potassium hydroxide 5.2
Dipropylene glycol 5.0
Diethylene glycol monoethyl ether 5.0
Glycerin 10.0
Sorbitol 10.0
Cocoyl methyl taurine sodium 1.5
High polymerization degree polyethylene glycol 0.02
Dibutylhydroxytoluene 0.1
EDTA · 2Na 0.2
Hydroxyethanediphosphonic acid 0.3
Purified water residue

Example 9 (face wash)
A face wash having the composition shown below was produced by mixing each component.
Fatty acids and salts thereof are 43.4% by mass, the proportion of fatty acids having 20 to 24 carbon atoms in all fatty acids is 17% by mass, and the mass ratio of fatty acids having 15 or less carbons: fatty acids having 16 or more carbons = 45: 55. Moreover, the neutralization degree of a fatty acid is 75% of the total fatty acid.

(component)
Lauric acid 2.9 (mass%)
Myristic acid 14.6
Palmitic acid 6.6
Stearic acid 8.2
Arachinic acid 1.0
Behenic acid 5.6
Potassium hydroxide 6.4
Dipropylene glycol 9.0
Diethylene glycol monoethyl ether 5.0
Glycerin 10.0
Lauramidopropyl betaine solution (30%) 5.0
Glycerol monostearate ester 2.0
Dipotassium glycyrrhizinate 0.1
Chelating agent Appropriate amount of plant extract Appropriate amount of perfume Appropriate amount of purified water Residue

Example 10 (body shampoo)
A body shampoo having the composition shown below was produced by mixing each component.
Fatty acids and salts thereof are 27.5% by mass, the proportion of fatty acids having 20 to 24 carbon atoms in all fatty acids is 17% by mass, and the mass ratio of fatty acids having 15 or less carbons: fatty acids having 16 or more carbons = 50: 50. Moreover, the neutralization degree of a fatty acid is 90% of the total fatty acid.

(component)
Lauric acid 8.0 (mass%)
Myristic acid 4.0
Palmitic acid 8.0
Arachinic acid 0.6
Behenic acid 3.4
Potassium hydroxide 5.0
Dipropylene glycol 8.0
Glycerin 10.0
Lauryl hydroxysulfobetaine solution (30%) 10.0
Palm fatty acid diethanolamide 1.0
Ethylene glycol distearate 3.0
Antioxidant Appropriate amount Preservative Appropriate amount Metal sequestering agent Appropriate amount pH adjuster Appropriate perfume Appropriate amount Purified water Residue

  The skin cleanser compositions obtained in Examples 8 to 10 are all excellent in foaming properties, foam quality, rinsing properties, low irritation, moist feeling after washing, cleanability and stability over time. .

Claims (4)

Fatty acid and its salt are 20-50 mass% in total, 20-70 mass% of water is contained, the neutralization degree of a fatty acid is 60-100%, and the composition of the fatty acid to comprise is C20-24. Liquid, creamy or pasty skin in which the fatty acid is 10 to 30% by mass in the total fatty acid and the mass ratio of the fatty acid having 15 or less carbon atoms and the fatty acid having 16 or more carbon atoms is 20:80 to 50:50 Cleaning composition.   The skin cleansing composition according to claim 1, wherein the fatty acid having 20 to 24 carbon atoms is selected from arachidic acid and behenic acid.   Furthermore, the skin cleansing composition of Claim 1 or 2 containing glycols or glycol ethers.   Furthermore, the skin cleanser composition of any one of Claims 1-3 containing the polyhydric alcohol which has a 3 or more hydroxyl group in a molecule | numerator.