JPS6229410B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to a shampoo composition that is less irritating to the skin and hair and has excellent hair conditioning properties. Conventionally, shampoos contain sodium alkylbenzene sulfonates, higher alcohol sulfate salts, polyoxyethylene alkyl sulfates, and the like as surfactants. However, since these surfactants have skin irritation properties, it has been proposed to add protein hydrolysates, acylated protein hydrolysates, amino acids, etc. to alleviate the irritation. is insufficient, and the additives have odor and color, making it difficult to apply them to shampoos. The present inventors have found that when birch bark and/or birch extract and sugar alcohol ester are combined as a surfactant, the foam has a good feel, does not inhibit lathering, provides smoothness to the hair, and is less irritating to the skin. They found that it can be alleviated and completed the present invention. That is, the shampoo composition of the present invention contains 0.0005-30.0% by weight of birch bark and/or xylem extract and 0.1-20.0% by weight of sugar alcohol ester in a shampoo composition containing a cleaning surfactant. It is characterized by The birch bark and/or xylem extract, which is one of the constituent components of the shampoo composition of the present invention, is a solution obtained by treating the birch bark and/or xylem as follows. The birch bark and/or xylem is cut into small pieces and air dried. An appropriate amount of water-ethanol mixed solvent is added to this dried product, and after being immersed for 1 to 2 weeks, it is centrifuged. After leaving this extract in a cool dark place for several days,
Obtained by filtration. Birch is a family of Betula (Betula).
alba) is a deciduous tree. Birch bark and/or xylem extract contains large amounts of betulin, a lupine triterpene, saponins, and tannins, as well as small amounts of essential oils, bitters, betulosid, Contains etc. Especially the bark is 10%
Contains more than 15% betulin and up to 15% tannins. The preferred amount of the birch bark and/or xylem extract is 0.0005 to 30.0% by weight, more preferably 0.05 to 10.0% by weight of the entire shampoo composition, calculated as evaporation residue after 6 hours at 105°C. be.
If the amount is less than 0.0005% by weight, the effects of the present invention will not be exhibited, and if it exceeds 30.0% by weight, the liquid transparency of the product will deteriorate over time. The sugar alcohol ester used in the present invention is represented by the following general formula. (However, R ¹ is a disaccharide residue, R ² has 10 to 18 carbon atoms.
(and n indicates the number of 1 and/or 2) If the number of carbon atoms in R ² is 9 or less, the feel of the foam will be poor, and if the number of carbon atoms is 19 or more, uniform dispersion will be poor, which is not preferable. . Sugars include sutucarose, maltose, lactose, and the like. The sugar alcohol ester used in the present invention is generally produced as follows. That is, sucrose is dissolved in dimethylformamide, fatty acid methyl ester is added, and the transesterification reaction is carried out by heating under reduced pressure in the presence of an alkali catalyst. Alternatively, sucrose is dissolved in propylene glycol or water and a fatty acid methyl ester is added, and sucrose is dissolved in propylene glycol or water and a fatty acid soap is added. It is manufactured using a method in which fatty acid ester is dispersed onto fine particles and reacted in a transparent emulsified state. The amount of sugar alcohol ester blended is preferably 0.1 to 20.0% by weight, more preferably 1.0 to 10.0% by weight of the entire shampoo composition. If it is less than 0.1% by weight, it will not be effective.
If it exceeds 20.0% by weight, the color tone of the product will deteriorate over time. The surfactants used in the shampoo composition of the present invention include those conventionally used, such as anionic surfactants such as alkylbenzene sulfonates, polyoxyethylene sulfate salts, alpha olefin sulfate salts; Nonionic surfactants such as ethylene alkyl ether, polyoxyethylene alkyl phenol ether, sorbitan fatty acid ester, polyoxyethylene acyl ester; cationic surfactants such as quaternary ammonium salts; amphoteric surfactants such as alkyl betaine including agents. In the present invention, the preferred amount of the surfactant is 3 to 30% by weight of the entire shampoo composition. Further, the shampoo of the present invention may contain additives such as inorganic or organic builders; CMC, lower alcohols, fluorescent dyes, colorants, fragrances, etc., as necessary. Next, the present invention will be explained in more detail based on the following experimental examples. Prior to that, an overview of the test methods and evaluation methods adopted in the experimental examples will be explained. Skin irritation was evaluated using methods (1) and (2) below. (1) Skin irritation A 1% aqueous shampoo composition solution (35°C) was used by 10 testers to perform a manual immersion test, that is, a 1-minute soak-dry operation 15 times, and after 24 hours the skin was visually evaluated. , determine the degree of skin roughness. ○: Almost no skin irritation △: Some dry exfoliating changes in the stratum corneum surface layer of the skin ×: Dry exfoliating changes in more than 30% of the skin (2) Skin irritation Evaluation of skin irritation is based on the molecular ellipticity of bovine serum albumin. (BSA molecular ellipticity) was used as an indicator and was measured by the following method. BSB molecular ellipticity measurement method After mixing 100 ppm of bovine serum albumin with each sample solution, add sodium phosphate buffer to 50 mM, and store at 25°C with JASCOCD Spectrop-
Circular dichroism was measured using an elarimeter to determine molecular ellipticity (θ). By the way, the molecular ellipticity of undenatured bovine serum albumin is -11.3×10 ⁶ deg・cm ² /
It was decimol. (The numerical unit in the table is -[θ]×10 ^-6 ) It has also been confirmed that the molecular ellipticity is equivalent to bovine serum albumin and that it does not cause denaturation and causes almost no skin irritation. Foaming power 20ml of 6% aqueous solution of adjusted shampoo composition
(25℃) into a 100ml cylinder, add 0.2g of liquid lanolin as an artificial stain, and
The mixture was shaken 20 times and the foam volume (ml) was measured after 1 minute. Sensory evaluation of foam Divide the hair into left and right halves, take 3g of each sample, lather, and then comprehensively evaluate the feel of the foam using sodium polyoxyethylene alkyl ether sulfate (AES-Na) as a standard by 10 testers. . In the above AES-Na, the average number of moles of EO (ethylene oxide) added is 3, and the alkyl group has a ratio of C ₁₂ /C ₁₃ = 1/1.

[Table] Evaluation〓

Claims (1)

[Scope of Claims] 1. Birch bark and/or xylem extract is added to the shampoo composition containing a cleaning surfactant.
A shampoo composition comprising 0.0005 to 30.0% by weight and 0.1 to 20.0% by weight of a sugar alcohol ester represented by the following general formula. (In the formula, R′ is a disaccharide residue, R ² has a carbon number of 10 to 18
an alkyl group, n is 1-2. )