JPS6229411B2 - - Google Patents

Description

[Detailed description of the invention]

This invention relates to a shampoo composition that is less irritating to the skin and hair, and provides excellent cleansing, good foam feel, and smoothness of the hair after cleansing. Conventionally, sodium alkylbenzene sulfonates, higher alcohol sulfate salts, polyoxyethylene alkyl sulfates, and the like have been used as main surfactants in shampoos, but these ingredients have skin irritation properties. In order to alleviate the skin irritation of detergents, it has been proposed to add protein hydrolysates, acylated protein hydrolysates, amino acids, etc. However, their ability to alleviate skin irritation is not sufficient. In addition, to alleviate skin irritation, saponin and aspartic acid (or sucrose) are added together to synthetic detergents whose main ingredients are sodium alkylbenzenesulfonate and polyoxyethylene alkyl phenyl ether sulfate. It is known to do so (Special Publication No. 19635). However, when this system is applied to a shampoo composition, although the skin irritation is considerably alleviated, the smoothness of the hair after washing is poor and a sufficient effect cannot be obtained. In view of the above circumstances, the present inventors conducted extensive research and found that when two components, birch bark and/or birch bark extract and polyglycerin fatty acid ester, were added to the conventionally used shampoo, the cleaning power increased. The present invention was completed based on the discovery that the foam has a good feel without any deterioration in foaming properties, and can also smooth hair and alleviate skin irritation. That is, the present invention adds birch bark and/or to a shampoo composition containing a detersive surfactant.
Alternatively, there is provided a shampoo composition characterized by containing 0.0005 to 30% by weight of xylem extract and 0.1 to 20% by weight of polyglycerin fatty acid ester. The cleaning surfactant used in this invention may be any surfactant conventionally used in cleaning agents, including anionic, cationic, amphoteric, and nonionic surfactants. include. These surfactants are generally added in an amount of 3 to 30% by weight based on the total shampoo composition to obtain the composition of the present invention. Specific surfactants used in the present invention include alkylbenzene sulfonates, polyoxyethylene sulfate salts, higher alcohol sulfate esters, alkylnaphthalene sulfonates, alkyl phosphate salts, and alpha olefin sulfate salts. Ionic surfactants; nonionic surfactants such as polyoxyethylene alkyl ether, polyoxyethylene alkyl phenol ether, sorbitan fatty acid ester, polyoxyethylene acyl ester; cationic surfactants such as quaternary ammonium salts and alkylamine salts Agent: Ampholytic surfactants such as alkyl betaines can be mentioned. 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. This extract is left standing in a cool, dark place for several days and then filtered. 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 tannins, essential oils, bitters, Contains betulosid, etc. In particular, the bark contains more than 10% betulin and up to 15% tannin. The preferred amount of 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. It is.
If the amount is less than 0.0005% by weight, the effects of the present invention will not be fully exhibited, and if it exceeds 30.0% by weight, the liquid transparency of the product will deteriorate over time. Polyglycerin fatty acid ester, which is an essential component of the present invention, is an esterified product of polyglycerin and fatty acid obtained by dehydration condensation of glycerin, and is represented by the following general formula. Here, R ₁ , R ₂ , R ₃ , R ₄ , and R ₅ are each independently hydrogen or a fatty acid residue, and at least one of them is a fatty acid residue. The fatty acid that provides the fatty acid residue is a saturated or unsaturated linear fatty acid, and preferably has 10 to 20 carbon atoms, more preferably 12 to 18 carbon atoms. Preferred specific examples of such fatty acids include lauric acid, myristic acid, palmitic acid, stearic acid, isostearic acid, and oleic acid. n is 0~
30, preferably an integer from 0 to 20. Glycerin fatty acid esters are unfavorable in terms of foam feel and hair smoothness, so polyglycerin fatty acid esters with n=0, that is, di or more, are used in the present invention. When n exceeds 30, it has the disadvantage of becoming sticky. Particularly preferred examples of polyglycerin fatty acid esters include decaglycerin laurate, decaglycerin myristate, decaglycerin palmitate, decaglycerin oleate, decaglycerin pentasteate, decaglycerin decastearate, decaglycerin decaisostearate, and stearin. Examples include hexaglycerin acid, hexaglycerin oleate, hexaglycerin hexaoleate, diglycerin stearate, and the like. The amount of polyglycerin fatty acid ester blended can be appropriately determined depending on the amount of birch bark and/or xylem extract blended, but is usually 0.1 to 20% by weight, preferably 0.1 to 10% by weight. It goes without saying that additives commonly added to shampoos can be optionally added to the shampoo composition of the present invention. Such additives are, for example, organic or inorganic builders, CMC, lower alcohols, fluorescent dyes, colorants, fragrances, and the like. Next, examples and comparative examples of the present invention will be shown to specifically explain the present invention. First, the test methods and evaluation methods adopted in each example will be explained. Skin irritation (a) Sensory evaluation 1% aqueous solution (35℃) of shampoo composition
A famous tester soaked his hands for 1 minute and then dried them for 1 minute, repeating the soaking-drying process 15 times.
After 24 hours, the degree of skin irritation was visually assessed. The evaluation is based on the following three levels. ○: Almost no skin roughness △: Partial dry exfoliation change in the stratum corneum surface layer of the skin ×: Dry exfoliation change in more than 30% (b) Bovine serum albumin molecular ellipticity Skin irritation was determined by bovine serum albumin (BSA) )
The molecular ellipticity of was evaluated as an indicator. Molecular ellipticity was measured by the following method. BSA molecular ellipticity measurement method After mixing 100 ppm of bovine serum albumin and each sample solution, add sodium phosphate buffer to 50 mM, and store at 25°C with JASCOCD.
Circular dichroism was measured using a spectropelarimeter to determine molecular ellipticity. The molecular ellipticity of unmodified BSA was −11.3×10 ⁻⁶ deg·cm ² /decimol. It has been confirmed that those with molecular ellipticity equivalent to BSA and showing no denaturation have almost no skin irritation. The values shown in the table below are the ellipticity θ expressed as −[θ]×10 ^-6 ,
Therefore, the closer this value is to 11.3, the lower the skin irritation. Foaming power (indicator of cleaning power) Collect 20 ml of a 6% aqueous solution (at 25°C) of each sample into a 100 ml cylinder and use liquid lanolin as an artificial stain.
0.2 g was added, shaken 20 times for 10 seconds, and the foam volume (ml) was measured after 1 minute. Feel of foam Divide your hair into left and right halves, and add 3g of sodium polyoxyethylene alkyl ether sulfate (AES-Na) to one side (average number of moles of ethylene oxide added = 3, alkyl group: C ₁₂ /C ₁₃ = 1/1) and 3g of each sample cleaning agent on the other side, and after lathering both, check the feel of the foam of each sample cleaning agent.
Sensory evaluation was performed based on the feel of AES-Na foam. This test was conducted by 10 testers. The evaluation is on a 5-level scale as shown below. ++: Foam feel is clearly superior to AES-Na. +: Slightly better foam feel than AES-Na. ±: The feel of bubbles is similar to that of AES-Na. -: Foam feel is inferior to AES-Na. --: Foam feel is much inferior to AES-Na. Hair smoothness Evaluated by sensory test. That is, a bundle of hair (5 g, 20 cm) after washing, rinsing and drying.
The smoothness is evaluated by 20 testers using a paired comparison method using a 20% solution of sodium dodecyl sulfate (SDS) as a control sample. Evaluation criteria ○: The evaluated product is clearly superior to SDS △: The evaluated product is slightly superior to SDS ×: The evaluated product is equivalent to SDS Examples 1 to 7, Comparative Examples 1 to 6 Shampoo compositions having the compositions shown in the table below was prepared and its performance was evaluated. The results are shown in the same table. In addition, the composition in the table is shown in weight%. *1: Coconut oil alcohol sulfate ester triethanolamine salt (molecular weight: 305) *2: A sample of C ₁₄ -α-olefin sulfonated with sulfuric anhydride, neutralized and hydrolyzed with sodium hydroxide was used (molecular weight:
308) *3: Use 50% ethanol solution. 105℃, 6
The amount added is displayed as the evaporation residue equivalent value in terms of time. *4: In the above formula, n = 8, esterification degree 2.3 *5: In the above formula, n = 8, esterification degree 3.7 *6: In the above formula, n = 30, esterification degree 7.5 *7: As described above In the formula, n = 0, degree of esterification 1.4

[Table] As is clear from the table, the compositions of Comparative Examples 1 to 4 do not contain both birch bark extract and polyglycerin fatty acid ester, and the compositions of Comparative Examples 5 and 6 do not contain the above ingredients. Because they do not contain either one of the two types of components, both have inferior performance. On the other hand, since Examples 1 to 7 of the composition of the present invention contain both of the above components,
All exhibit excellent performance.

Claims (1)

[Scope of Claims] 1. A shampoo composition containing a cleaning surfactant contains birch bark and/or xylem extract.
A shampoo composition characterized by containing 0.0005 to 30% by weight and 0.1 to 20% by weight of a polyglycerin fatty acid ester represented by the following general formula. (R ₁ , R ₂ , R ₃ , R ₄ , and R ₅ are each independently hydrogen or a saturated or unsaturated fatty acid residue having 10 to 20 carbon atoms, and n is an integer of 0 to 30.)