JPS6229408B2 - - 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 intensive research and found that when two components, saponin and polyglycerin fatty acid ester, were added to the conventionally used shampoo, the detergency and feel of the foam were good, and the foaming property was improved. The present invention was completed based on the discovery that it is possible to smooth the hair and alleviate skin irritation without causing deterioration. That is, the present invention provides a shampoo composition containing 0.001 to 10% by weight of saponin and 0.1 to 20% by weight of polyglycerol fatty acid ester in a shampoo composition containing a cleaning surfactant. do. 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 entire 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. Saponin used in the present invention is a well-known group of glycosides that are widely present in the plant kingdom and are a general term for those that create a colloidal aqueous solution that foams significantly like a saponin. It is obtained from plants spanning over 60 families. The sugar component is glycose, galactose, arabinose, uronic acid, etc., and the non-carbohydrate portion (aglucone) is a polycyclic compound usually called sapogenin, and some belong to triterpenoids and some belong to steroids. Saponins are commercially available as white or brown amorphous powders with irritant properties. Commercially available saponins contain water and/or
Alternatively, it is produced by extracting with other organic solvents such as ethanol or propylene glycol, and recovering saponin by precipitation, recrystallization, etc. Plants containing saponins include licorice, senega,
Quillaja saponaria, Korean carrot, soapwort,
These include Kikiyo, Akebia, and Marigold. The amount of saponin to be blended should not be so small that it cannot alleviate skin irritation, nor should it be so large that it dilutes the surfactant too much and weakens its cleaning power. The appropriate amount can be determined depending on the type of cleaning agent, but is usually about 0.001 to 10% by weight, preferably about 0.1 to 10% by weight. 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 specific 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, and diglycerin stearate. The amount of polyglycerin fatty acid ester blended can be appropriately determined depending on the amount of saponin 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 ×: 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. Transparency A 15% aqueous solution of each sample was prepared and visually evaluated. ○: Good ×: Poor foam feel Divide the hair into left and right halves, and add 3 g 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 that of AES-Na. Hair smoothness Evaluated by sensory test. That is, after washing, rinsing and drying, the smoothness of the hair bundle (5 g, 20 cm) is evaluated by the paired comparison method by 20 testers using a 20% solution of sodium dodecyl sulfate (SDS) as a control sample. Evaluation criteria ○: The evaluated product is clearly superior to SDS. Δ: Evaluation product is superior to SDS ×: Evaluation product is equivalent to SDS Examples 1 to 13, Comparative Examples 1 to 9 Shampoo compositions having the compositions shown in the table below were prepared and their 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: In the above formula, n = 8, degree of esterification 2.3 *4: In the above formula, n = 8, degree of esterification 3.7 *5: In the above formula, n = 0, degree of esterification 1.5 *6: In the above formula, n = 3, degree of esterification 1.3 *7: In the above formula, n = 30, degree of esterification 8.4

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Claims (1)

[Claims] 1. A shampoo composition containing a detersive surfactant containing 0.001 to 10% by weight of saponin and 0.1 to 20% by weight of a polyglycerin fatty acid ester represented by the following general formula. Shampoo composition. (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.)