JP3644566B2 - Hair cleaning composition - Google Patents

Description

（式中、Ｒ¹は炭素数７〜２１の直鎖又は分岐鎖の飽和又は不飽和の炭化水素基、Ｒ²は水素又は炭素数１〜３のアルキル基、Ｘはアルカリ金属、アンモニウム、炭素数１〜３のアルキル置換アンモニウム、炭素数１〜３のヒドロキシアルキル基を有するアルカノールアミンを示す。ｎは１又は２の整数を示す。）
【００１１】
これに該当する化合物の具体例としては、Ｎ−アシルエチルグリシン、Ｎ−アシルイソプロピルグリシン、Ｎ−アシルサルコシン、Ｎ−アシル−β−アラニン、Ｎ−アシル−Ｎ−メチル−β−アラニン等のナトリウム塩、カリウム塩、マグネシウム塩、トリエタノールアミン塩等の塩類が挙げられる。
【００１２】
特にこの中で、Ｎ−アシル−Ｎ−メチル−β−アラニンの塩、Ｎ−アシル−β−アラニンの塩、Ｎ−アシルサルコシンの塩が好適に用いられる。
【００１３】
本発明に使用される前記成分（ｂ）は、両性界面活性剤である。両性界面活性剤の種類に限定はないが、具体例としては、下記一般式（２）〜（７）の化合物が挙げられる。
【００１４】
【化２】

（式中、Ｒ³は炭素数７〜２１の直鎖又は分岐鎖の飽和又は不飽和の炭化水素基を、Ｒ⁴及びＲ⁵は炭素数１〜４のアルキル基を、Ｑは炭素数１〜３のアルキレン基又は炭素数２〜３のヒドロキシアルキレン基を、Ｚ^-は−ＣＯＯ^-又は−ＳＯ₃ ^-を示すが、Ｚ^-が−ＣＯＯ^-であるときにはＱはアルキレン基である。ｌは１〜５の整数、ｍは０又は１の整数を示す。）
【００１５】
【化３】

（式中、Ｒ⁶は炭素数９〜１７のアルキル基又はアルケニル基、Ｒ⁷は−ＣＨ₂ＣＯＯＭ¹又は−ＣＨ₂ＣＨ₂ＣＯＯＭ²、Ｒ⁸は水素、−ＣＨ₂ＣＯＯＭ³又は−ＣＨ₂ＣＨ₂ＣＯＯＭ⁴を示す。ここで、Ｍ¹〜Ｍ⁴は水溶性塩を形成するカチオンである。）
【００１６】
【化４】

（式中、Ｒ⁹は炭素数７〜１９のアルキル基もしくはアルケニル基又は炭素数７〜１５のアルキル基で置換されたアルキルフェニル基、、Ｒ¹⁰及びＲ¹¹は水素原子、−ＣＨ₂ＣＯＯＭ¹又は−ＣＨ₂ＣＨ₂ＣＯＯＭ²を示す。但し、Ｒ¹⁰とＲ¹¹とは同時に水素原子であることはなく、ここで、Ｍ¹及びＭ²は水素原子、ナトリウム、カリウム、アルカノールアミン、又はアルカリ土類金属を示す。）
【００１７】
【化５】

（式中、Ｒ¹²は炭素数５〜１９のアルキル基又はアルケニル基、Ｒ¹³は炭素数１〜４のアルキレン基、Ｒ¹⁴は炭素数１〜４のアルキレン基又はＯＨ基で置換されたアルキレン基、Ｍ³及びＭ⁴はそれぞれ水素原子、アルカリ金属又はアルカノールアミンから誘導されるカチオンを示し、Ｇは任意のアニオンを示す。）
【００１８】
【化６】

（式中、Ｒ¹²、Ｒ¹³、Ｍ³、Ｍ⁴は上記と同様の意味を示し、Ｒ¹⁵は炭素数１〜４のアルキレン基、ＯＨ基で置換されたアルキレン基、Ｇは任意のアニオンを示す。）
【００１９】
【化７】

（式中、Ｒ¹²、Ｒ¹³、Ｍ³、Ｍ⁴及びＧは上記と同様の意味を示す。）
【００２０】
より具体的には、例えばＮ−デシルベタイン、セチルベタイン、ステアリルベタイン、ココベタイン、ココアミドプロピルベタイン、ラウリン酸アミドプロピルベタイン、ラウリン酸アミドメチルベタイン、ミリスチン酸アミドメチルベタイン、パルミチン酸アミドメチルベタイン、ステアリン酸アミドメチルベタイン、ココジメチルスルホプロピルベタイン、ステアリルジメチルスルホプロピルベタイン、ココアミノメチルスルホプロピルベタイン、ステアリルアミノメチルジメチルスルホプロピルベタイン、ミリスチルアミノメチルジメチルスルホプロピルベタイン、ラウリルアミノメチル−ビス−（２−ヒドロキシエチル）−スルホプロピルベタイン、Ｎ−ラウロイル−Ｎ−（２−ヒドロキシエチル）−Ｎ−カルボキシメチルエチレンジアミン、Ｎ−ラウロイル−Ｎ−（２−ヒドロキシエチル）−Ｎ’，Ｎ’−ビス（カルボキシエチル）エチレンジアミン、Ｎ−ラウロイル−Ｎ’−カルボキシメチル−Ｎ’−カルボキシメトキシエチルエチレンジアミン、Ｎ−ラウロイル−Ｎ’−カルボキシエチル−Ｎ’−（２−ヒドロキシエチル）−エチレンジアミン、Ｎ−ラウロイル−Ｎ’−カルボキシエトキシエチルエチレンジアミン、Ｎ−ラウロイル−Ｎ’−カルボキシエチル−Ｎ’−カルボキシエトキシエチルエチレンジアミンなどを挙げることができる。
【００２１】
本発明に使用される前記成分（ｃ）は、特定の多価アルコールである。該多価アルコールとしては、プロピレングリコール、ジプロピレングリコール、ヘキシレングリコール、１，３−ブチレングリコール、グリセリンを用いることができる。
【００２２】
これら必須成分である成分（ａ）〜成分（ｃ）の配合量は、成分（ａ）〜成分（ｃ）の合計量（ａ）＋（ｂ）＋（ｃ）が組成物全体に対して１０．０〜３０．０重量％であり、各成分の配合割合（重量）が、（ａ）：（ｂ）＝１０：１〜１０：９であり、かつ（ｃ）／〔（ａ）＋（ｂ）〕＝０．０５〜０．２（但し、０．１５以上を除く）である。この範囲にある組成物は本発明の効果がより良好に発揮される。
（ａ）＋（ｂ）＋（ｃ）の合計量が１０．０重量％未満であると、場合によっては泡立ちが不足する場合があり、３０．０重量％を超えるとすすぎ性能がやや劣る傾向が現われる場合がある。
また、（ａ）：（ｂ）の重量比が１０：１〜１０：９の範囲になると、同様に泡性能やすすぎ性能がやや劣ることが懸念される場合がある。
更にまた、（ｃ）／〔（ａ）＋（ｂ）〕の重量比が０．０５未満になると弱酸性領域（ｐＨ＝５〜７）でのｐＨ変化に対する粘度変化の抑制効果は不十分であり、０．２を超えると著しく粘度が低下し、また、Ｎ−アシル中性アミノ酸の溶解性も悪くなる。
【００２３】
本発明の毛髪洗浄剤組成物は、上記特定の組成からなるものであり、弱酸性領域（ｐＨ５〜７）において、下記式で表わされる粘度変化率が１．７未満となる。特に粘度変化率が１．５未満が好ましい。
粘度変化率＝粘度最大値／粘度最小値
【００２４】
本発明の毛髪洗浄剤組成物は、上記の３種の成分を必須成分とするものであり、これらの必須成分を含有する毛髪洗浄剤組成物はｐＨ５〜７の範囲で泡立ちが優れており、特にｐＨ６において最大となる。ｐＨ５未満では、泡立ちは劣化し、また、Ｎ−アシル中性アミノ酸の溶解性も劣り、結晶が析出する。また、ｐＨが７を超えると泡立ちが低下して好ましくない。
【００２５】
この発明の毛髪洗浄剤組成物には、以上の他に本発明の効果を損なわない範囲で、従来の毛髪洗浄剤組成物に配合されている成分を配合することができる。
例えば、他のアニオン性界面活性剤、カチオン性界面活性剤、ノニオン性界面活性剤、増粘剤、油分、溶剤、防腐剤、フケ止め剤、殺菌剤、酸化防止剤、トニック剤、着色剤、香料、紫外線吸収剤、高分子化合物、シリコーン誘導体、減粘剤、ハイドロトロープ、湿潤剤、ｐＨ調整剤、パール化剤等を必要に応じて配合することができる。
【００２６】
【実施例】
次に、本発明を実施例及び比較例によって更に具体的かつ詳細に説明するが本発明はこの実施例によって限定されない。なお、以下に示す％はいずれも重量％である。また、実施例及び比較例の毛髪洗浄剤組成物の評価は下記の方法で行った。
【００２７】
（１）粘度
試験試料の２５℃における粘度を東京計器（株）製Ｂ型粘度計を使用して測定した。
【００２８】
（２）外観
試験試料調製後、５０ｍｌパイヤルビンに満注し、２５℃における外観を目視にて観察した。
外観の判定基準は以下の通りである。
○：無色透明
△：微白濁
×：白濁
【００２９】
（３）泡立ち
調製した毛髪洗浄剤組成物の６％水溶液を２５℃において２０ｍｌ、１００ｍｌのメスシリンダーに採取し、これに人工汚垢として液状ラノリン０．２ｇを加えて１０秒間に２０回振とうし、振とう終了時から１分後の泡容積を測定した。泡容積の判定基準は以下の通りである。○および◎を合格とした。
◎：６５ｍｌ以上
○：５５〜６４ｍｌ
△：４５〜５４ｍｌ
×：４５ｍｌ未満
【００３０】
（４）すすぎ時の感触
パネルの頭髪を左右に２分し、片方に調製した毛髪洗浄剤組成物を、もう片方に標準試料をそれぞれ３．０ｍｌずつ塗布し、泡立てた後、温水にてすすぐ。すすぎ時のきしみのなさについてパネルが評価した結果を以下のように評価した。
＋３点：標準試料に比較し明らかに良い
＋２点：標準試料に比較しかなり良い
＋１点：標準試料に比較しやや良い
０点：標準試料に比較し同等
−１点：標準試料に比較しやや悪い
−２点：標準試料に比較しかなり悪い
−３点：標準試料に比較し明らかに悪い
パネル（ｎ＝８）の合計を算出し、以下のように判定した。○および◎を合格とした。
◎：２０点以上
○：１２〜１９点
△：４〜１１点
×：３点以下
【００３１】
実施例１〜７、比較例１〜２４
実施例及び比較例の毛髪洗浄剤組成物を調製し、これについて前記の方法で評価した結果を表１〜４に示す。尚、表１〜４における各成分の配合量は重量％で表示した。また、各組成物のｐＨはクエン酸又は水酸化ナトリウムにより調整され、残部は精製水よりなる。
【００３２】
【表１】

【００３３】
表１の結果より、本発明の毛髪洗浄剤組成物（実施例１〜３）は、ｐＨ５〜７の弱酸性領域で粘度の変化が極めて少ない安定した組成物であることが分かる。また、本発明の成分（ｃ）を含有しているが、成分（ｂ）を欠く毛髪洗浄剤組成物（比較例１〜３）は、粘度安定剤を含むため、粘度の安定化効果は若干あるものの、成分（ｃ）を欠くためｐＨ５〜７の領域での粘度変化がある。また、本発明の成分（ａ）の代りにＮ−アシル酸性アミノ酸塩を用いた毛髪洗浄剤組成物（比較例４〜６）や、本発明の成分（ｃ）の代りにイソプレングリコールを用いた毛髪洗浄剤組成物（比較例７〜９）はｐＨ５〜７の領域での粘度変化が著しく、しかも外観も白濁したものもある。更にまた本発明の成分（ｃ）が多すぎる毛髪洗浄剤組成物（比較例１０〜１２）は、外観が白濁し、また、成分（ｃ）が少なすぎると毛髪洗浄剤組成物（比較例１３〜１５）は、ｐＨ５〜７領域での粘度安定化効果が不十分であり、成分（ｃ）の配合割合が本発明の範囲を外れると好ましくない。
【００３４】
【表２】

【００３５】
表２の結果より、本発明の毛髪洗浄剤組成物（実施例４〜７）は、ｐＨ５〜７領域で粘度安定性、外観、泡立ち、すすぎ時のきしみのなさの全てにおいて優れていることが分かる。また本発明の成分（ｃ）を欠く毛髪洗浄剤組成物（比較例１６〜１９）は、ｐＨ５〜７領域での粘度変化が著しく、また成分（ａ）が成分（ｂ）より少ない毛髪洗浄剤組成物（比較例２０）は、泡立ちが不十分となり、成分（ａ）、（ｂ）、（ｃ）の合計濃度が３０重量％より多い毛髪洗浄剤組成物（比較例２１）はすすぎ性に劣り、また１０重量％未満の毛髪洗浄剤組成物（比較例２２）は泡立ちが不十分となり、成分（ｃ）が多すぎる毛髪洗浄剤組成物（比較例２３）は、外観、泡立ち、すすぎ性の全てに劣り、成分（ｂ）を欠く毛髪洗浄剤組成物（比較例２４）は、粘度変化がある（表１の比較例１〜３）上、泡立ちも劣り、すすぎ時のきしみも生じ、成分（ａ）の代りにＮ−アシル酸性アミノ酸塩を用いた毛髪洗浄剤組成物（比較例２５）は、粘度変化も著しく（表１の比較例４〜６）、外観も白濁である上、泡立ちも劣ることが分かる。
実施例４〜７と比較例１６〜２０の毛髪洗浄剤組成物のｐＨ変化に対する粘度の変化を図１に示す。図１から本発明の実施例４〜７の毛髪洗浄剤組成物は弱酸領域下での粘度変化率が極めて小さく、製品管理上極めて好ましいものであることが分かる。これに対して比較例１６〜２０の毛髪洗浄剤組成物は、弱酸領域下での粘度が大幅に変化してしまい、製品管理が極めて難しいものであることが分かる。
【００３６】
実施例８〜２７
表３〜４に本発明の組成物を商品化する際の配合例を示す。表３〜４の結果から、商品化に必要な配合剤、例えば保存安定剤、香料、色素等を配合しても、粘度安定性、泡立ち、すすぎ時のきしみのなさにおいて、優れた性能を有することが分かる。
【００３７】
【表３】

【００３８】
【表４】

【００３９】
【発明の効果】
本発明の毛髪洗浄剤組成物は、Ｎ−アシル中性アミノ酸塩を主界面活性剤とする弱酸性（ｐＨ５〜７）で使用する、ｐＨ変化に対する粘度変化が極めて小さく、しかも泡立ち、及びすすぎ性能にも優れた毛髪洗浄剤組成物である。
【図面の簡単な説明】
【図１】本発明の毛髪洗浄剤組成物と比較例の毛髪洗浄剤組成物のｐＨ変化に対する粘度の変化を表わすグラフ。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a weakly acidic hair cleansing composition comprising an N-acyl neutral amino acid having good foaming and rinsing performance as a main surfactant, particularly having a small viscosity change rate with respect to pH change.
[0002]
[Prior art]
In recent years, acylated products of amino acids have attracted attention as surfactants with good foaming and low irritation. Representative amino acid surfactants include N-acyl amino acid salts such as N-acyl sarcosine salt, N-acyl glutamic acid, and N-acyl-N-methyl-β-alanine salt.
[0003]
Among these, for N-acyl acidic amino acid salts such as N-acyl glutamate, fatty acid ester nonionic surfactants and organic carboxylic acids (JP-B-52-31203), cationized cellulose polymers (JP-A-59-41397). ), Fatty acid diethanolamide (Japanese Patent Laid-Open No. 3-11500), etc., it has been proposed to improve foam performance and the like.
However, according to the results of further studies by the present inventors, the improvement in foam performance and creaminess is still not sufficient with a weak acidity of pH 5-7.
In addition, the product viscosity is not easily increased by a thickener or the like, and there are drawbacks in use such that the product is easily spilled from the palm.
[0004]
On the other hand, as for N-acyl neutral amino acid salts such as N-acyl-N-methyl-β-alanine salts, amide betaine amphoteric activators and fatty acid diethanolamides (Japanese Patent Laid-Open No. 3-115495), N-alkyl-N, It has been proposed to improve foam performance by using in combination with an N-dimethyl-α-betaine amphoteric surfactant and an alkylolamide nonionic surfactant (Japanese Patent Laid-Open No. 4-80298).
[0005]
By the way, the pH of the aqueous solution of the N-acyl neutral amino acid salt is 7.0 to 10.0 in a 1% aqueous solution and is neutral to alkaline. However, in order to keep the hair in good condition, the pH of the product is weakened. It is desirable to make it acidic. In addition, the inventors' research has also confirmed that foaming occurs in a pH range of 5 to 7 and the creaminess of the foam is improved. When the pH of the aqueous solvent for these surfactants is adjusted to be weakly acidic with an organic acid or the like, N-acyl neutral amino acids are generated, and the viscosity increases to form a stable liquid crystal structure in an aqueous solution. By adding a small amount, an optimum product viscosity can be obtained.
[0006]
However, the viscosity change rate with respect to the pH change in the weakly acidic region (pH = 5 to 7) is very large, and when the pH is lowered by an organic acid or the like, the viscosity gradually increases and the pH value at which foaming is best is achieved. After showing a peak viscosity in the vicinity of 6, the viscosity decreases, and when the pH further decreases, precipitation of N-acyl neutral amino acids occurs. When an N-acyl neutral amino acid salt is used in a hair washing agent in a weakly acidic region, the above-described conventional technique causes a significant change in viscosity in a narrow pH region, and this phenomenon is preferable for product management. Absent.
Moreover, when N-acyl neutral amino acid is used independently, the malfunction in rinse performance, such as a squeak at the time of a rinse and a wrinkle, will arise.
[0007]
[Problems to be solved by the invention]
The present invention solves the above-mentioned problems found in conventional hair cleansing compositions, and uses an N-acyl neutral amino acid salt having a very low viscosity change rate with respect to pH change and excellent foaming and rinsing performance as a main interface. It is an object of the present invention to provide a weakly acidic hair cleansing composition as an active agent.
[0008]
[Means for Solving the Problems]
As a result of intensive studies to solve the above-mentioned problems, the present inventors have identified a weakly acidic hair cleansing composition containing a specific ratio of an N-acyl neutral amino acid salt and an amphoteric surfactant. It has been found that by containing a specific amount of polyhydric alcohol, the rate of change in viscosity with respect to pH change is reduced, and the foaming power and rinsing performance are also improved, and the present invention has been completed based on this finding.
[0009]
That is, according to the present invention, and at least one (a) and amphoteric surfactants (b) are selected from N- Ashiruarani emissions salt and N- Ashirusarukoshi down salts, substantially free of N- acyl acidic amino acid In a hair cleanser composition used in a weakly acidic region not included in the composition, one or more kinds selected from propylene glycol, dipropylene glycol, hexylene glycol, 1,3-butylene glycol, and glycerin are further used as a viscosity stabilizer. Polyhydric alcohol (c) is blended, and each component blending ratio (weight) satisfies the following formulas (A) and (B), and the components (a), (b), (c) ) Is a total concentration of 10.0 to 30.0% by weight, and the maximum / minimum value of the viscosity at pH 5 to 7 is less than 1.7. .
(A) :( b) = 10: 1-10: 9 (...)
(C) / [(a) + (b)] = 0.05 to 0.20 (excluding 0.15 or more) (b)
[0010]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, each component of the hair cleansing composition of the present invention will be described in detail with specific examples, but the present invention is not limited to these specific examples.
The component (a) used in the present invention is a surfactant comprising a specific N-acyl neutral amino acid salt represented by the following general formula (1).
[Chemical 1]

(Wherein R ¹ is a linear or branched saturated or unsaturated hydrocarbon group having 7 to 21 carbon atoms, R ² is hydrogen or an alkyl group having 1 to 3 carbon atoms, X is an alkali metal, ammonium, carbon An alkanolamine having an alkyl-substituted ammonium of 1 to 3 and a hydroxyalkyl group of 1 to 3 carbon atoms, n represents an integer of 1 or 2)
[0011]
Specific examples of such compounds include sodium such as N-acylethylglycine, N-acylisopropylglycine, N-acylsarcosine, N-acyl-β-alanine, N-acyl-N-methyl-β-alanine, etc. Salts such as salts, potassium salts, magnesium salts, triethanolamine salts and the like can be mentioned.
[0012]
Of these, N-acyl-N-methyl-β-alanine salts, N-acyl-β-alanine salts, and N-acyl sarcosine salts are preferably used.
[0013]
The component (b) used in the present invention is an amphoteric surfactant. Although there is no limitation in the kind of amphoteric surfactant, As a specific example, the compound of following General formula (2)-(7) is mentioned.
[0014]
[Chemical formula 2]

(In the formula, R ³ is a linear or branched saturated or unsaturated hydrocarbon group having 7 to 21 carbon atoms, R ⁴ and R ⁵ are alkyl groups having 1 to 4 carbon atoms, and Q is 1 carbon atom. the ~ 3 alkylene group or a number 2-3 hydroxyalkylene group of carbon atoms of, Z ^- is -COO ^- or -SO ₃ ^- are illustrated, Z ^- is -COO ^- when is Q is an alkylene group .l is (An integer of 1 to 5, m represents an integer of 0 or 1)
[0015]
[Chemical 3]

Wherein R ⁶ is an alkyl or alkenyl group having 9 to 17 carbon atoms, R ⁷ is —CH ₂ COOM ¹ or —CH ₂ CH ₂ COOM ² , R ⁸ is hydrogen, —CH ₂ COOM ³ or —CH ₂ CH ₂ COOM ⁴ is indicated, where M ^{1 to} M ⁴ are cations that form water-soluble salts.
[0016]
[Formula 4]

(Wherein R ⁹ is an alkyl or alkenyl group having 7 to 19 carbon atoms or an alkylphenyl group substituted with an alkyl group having 7 to 15 carbon atoms, R ¹⁰ and R ¹¹ are hydrogen atoms, —CH ₂ COOM ¹ Or —CH ₂ CH ₂ COOM ² , wherein R ¹⁰ and R ¹¹ are not simultaneously hydrogen atoms, where M ¹ and M ² are hydrogen atoms, sodium, potassium, alkanolamine, or alkali Indicates earth metal.)
[0017]
[Chemical formula 5]

Wherein R ¹² is an alkyl or alkenyl group having 5 to 19 carbon atoms, R ¹³ is an alkylene group having 1 to 4 carbon atoms, and R ¹⁴ is an alkylene group substituted with an alkylene group having 1 to 4 carbon atoms or an OH group. The groups M ³ and M ⁴ each represent a cation derived from a hydrogen atom, an alkali metal or an alkanolamine, and G represents any anion.)
[0018]
[Chemical 6]

Wherein R ¹² , R ¹³ , M ³ and M ⁴ have the same meaning as above, R ¹⁵ is an alkylene group having 1 to 4 carbon atoms, an alkylene group substituted with an OH group, and G is an arbitrary anion. Is shown.)
[0019]
[Chemical 7]

(In the formula, R ¹² , R ¹³ , M ³ , M ⁴ and G have the same meaning as described above.)
[0020]
More specifically, for example, N-decyl betaine, cetyl betaine, stearyl betaine, coco betaine, cocoamidopropyl betaine, lauric acid amidopropyl betaine, lauric acid amidomethyl betaine, myristic acid amidomethyl betaine, palmitic acid amidomethyl betaine, Stearic acid amidomethyl betaine, cocodimethylsulfopropylbetaine, stearyldimethylsulfopropylbetaine, cocoaminomethylsulfopropylbetaine, stearylaminomethyldimethylsulfopropylbetaine, myristylaminomethyldimethylsulfopropylbetaine, laurylaminomethyl-bis- (2- Hydroxyethyl) -sulfopropylbetaine, N-lauroyl-N- (2-hydroxyethyl) -N-carboxymethylethylene Amine, N-lauroyl-N- (2-hydroxyethyl) -N ′, N′-bis (carboxyethyl) ethylenediamine, N-lauroyl-N′-carboxymethyl-N′-carboxymethoxyethylethylenediamine, N-lauroyl- Examples include N′-carboxyethyl-N ′-(2-hydroxyethyl) -ethylenediamine, N-lauroyl-N′-carboxyethoxyethylethylenediamine, N-lauroyl-N′-carboxyethyl-N′-carboxyethoxyethylethylenediamine, and the like. be able to.
[0021]
The component (c) used in the present invention is a specific polyhydric alcohol. As the polyhydric alcohol, propylene glycol, dipropylene glycol, hexylene glycol, 1,3-butylene glycol, and glycerin can be used.
[0022]
The amount of these essential components (a) to (c) is such that the total amount (a) + (b) + (c) of component (a) to component (c) is 10 with respect to the total composition. 0.0 to 30.0% by weight, and the blending ratio (weight) of each component is (a) :( b) = 10: 1 to 10: 9, and (c) / [(a) + ( b)] = 0.05 to 0.2 (excluding 0.15 or more) . In the composition within this range, the effect of the present invention is exhibited better.
When the total amount of (a) + (b) + (c) is less than 10.0% by weight, foaming may be insufficient in some cases, and when it exceeds 30.0% by weight, the rinsing performance tends to be slightly inferior. May appear.
Moreover, when the weight ratio of (a) :( b) is in the range of 10: 1 to 10: 9, there may be a concern that the foam performance and the excessive performance are slightly inferior.
Furthermore, when the weight ratio of (c) / [(a) + (b)] is less than 0.05, the effect of suppressing the viscosity change with respect to the pH change in the weakly acidic region (pH = 5 to 7) is insufficient. If it exceeds 0.2, the viscosity is remarkably lowered, and the solubility of the N-acyl neutral amino acid is also deteriorated.
[0023]
The hair cleansing composition of the present invention is composed of the above specific composition, and the viscosity change rate represented by the following formula is less than 1.7 in the weakly acidic region (pH 5 to 7). In particular, the viscosity change rate is preferably less than 1.5.
Viscosity change rate = maximum viscosity value / minimum viscosity value
The hair cleansing composition of the present invention comprises the above three components as essential components, and the hair cleansing composition containing these essential components has excellent foaming in the pH range of 5-7, In particular, it becomes maximum at pH 6. When the pH is less than 5, the foaming deteriorates, and the solubility of the N-acyl neutral amino acid is also inferior, so that crystals are precipitated. Moreover, when pH exceeds 7, foaming falls and it is not preferable.
[0025]
In addition to the above, the hair cleansing composition of the present invention can be blended with the components blended in the conventional hair cleansing composition as long as the effects of the present invention are not impaired.
For example, other anionic surfactants, cationic surfactants, nonionic surfactants, thickeners, oils, solvents, preservatives, anti-dandruff agents, bactericides, antioxidants, tonic agents, colorants, A fragrance | flavor, a ultraviolet absorber, a high molecular compound, a silicone derivative, a viscosity reducer, a hydrotrope, a wetting agent, a pH adjuster, a pearling agent, etc. can be mix | blended as needed.
[0026]
【Example】
EXAMPLES Next, although an Example and a comparative example demonstrate this invention further more concretely and in detail, this invention is not limited by this Example. In addition, all the% shown below are weight%. Moreover, evaluation of the hair cleaning composition of an Example and a comparative example was performed with the following method.
[0027]
(1) Viscosity of the viscosity test sample at 25 ° C. was measured using a B-type viscometer manufactured by Tokyo Keiki Co., Ltd.
[0028]
(2) Appearance test After preparing the sample, it was poured into 50 ml pailrubin, and the appearance at 25 ° C was visually observed.
The criteria for appearance are as follows.
○: Colorless and transparent △: Slight cloudiness ×: Cloudiness [0029]
(3) A foamed 6% aqueous solution of a hair cleansing composition is collected in a 20 ml and 100 ml measuring cylinder at 25 ° C., 0.2 g of liquid lanolin is added as artificial dirt to this and shaken 20 times in 10 seconds. The foam volume after 1 minute from the end of shaking was measured. The criteria for determining the bubble volume are as follows. ○ and ◎ were accepted.
◎: 65 ml or more ○: 55-64 ml
Δ: 45-54 ml
×: Less than 45 ml [0030]
(4) The hair of the touch panel at the time of rinsing is divided into two parts to the left and right, and the hair cleansing composition prepared on one side is applied to each 3.0 ml each of the standard sample, foamed and then rinsed with warm water . The results of the panel's evaluation on the absence of squeak during rinsing were evaluated as follows.
+3 points: clearly better than the standard sample +2 points: considerably better than the standard sample +1 point: slightly better than the standard sample 0 point: equivalent to the standard sample -1 point: slightly better than the standard sample Bad -2 points: quite bad compared to the standard sample -3 points: The total of clearly bad panels (n = 8) compared to the standard sample was calculated and judged as follows. ○ and ◎ were accepted.
◎: 20 points or more ○: 12 to 19 points Δ: 4 to 11 points ×: 3 points or less
Examples 1-7, Comparative Examples 1-24
The hair cleaning composition of an Example and a comparative example was prepared, and the result evaluated by the said method about this is shown to Tables 1-4. In addition, the compounding quantity of each component in Tables 1-4 was displayed by weight%. Moreover, pH of each composition is adjusted with a citric acid or sodium hydroxide, and the remainder consists of purified water.
[0032]
[Table 1]

[0033]
From the results of Table 1, it can be seen that the hair cleansing compositions of the present invention (Examples 1 to 3) are stable compositions with very little change in viscosity in a weakly acidic region of pH 5 to 7. Moreover, since the hair washing | cleaning-agent composition (Comparative Examples 1-3) which contains the component (c) of this invention but lacks a component (b) contains a viscosity stabilizer, the viscosity stabilization effect is a little. Although there is a component (c), there is a viscosity change in the pH range of 5-7. Further, a hair cleanser composition (Comparative Examples 4 to 6) using an N-acyl acidic amino acid salt instead of the component (a) of the present invention, and isoprene glycol instead of the component (c) of the present invention. The hair cleansing compositions (Comparative Examples 7 to 9) have a marked change in viscosity in the pH range of 5 to 7, and some have become cloudy in appearance. Furthermore, the hair cleanser composition (Comparative Examples 10 to 12) having too much component (c) of the present invention is cloudy in appearance, and if the component (c) is too small, the hair cleanser composition (Comparative Example 13). ~ 15) is insufficient in viscosity stabilizing effect in the pH 5-7 region, and it is not preferable if the blending ratio of the component (c) is out of the range of the present invention.
[0034]
[Table 2]

[0035]
From the results of Table 2, the hair cleansing compositions of the present invention (Examples 4 to 7) are excellent in all of viscosity stability, appearance, foaming, and no squeaking at the time of rinsing in the pH 5 to 7 region. I understand. Further, the hair cleansing compositions lacking the component (c) of the present invention (Comparative Examples 16 to 19) have a remarkable viscosity change in the pH range of 5 to 7, and the hair cleansing agent has a smaller component (a) than the component (b). In the composition (Comparative Example 20), foaming becomes insufficient, and the hair cleaning composition (Comparative Example 21) in which the total concentration of the components (a), (b), and (c) is more than 30% by weight is rinsed. Inferior, less than 10% by weight of the hair cleanser composition (Comparative Example 22) is insufficient in foaming, and the hair cleanser composition (Comparative Example 23) having too much component (c) has an appearance, foaming and rinsing properties. The hair cleanser composition (Comparative Example 24) lacking the component (b) has a viscosity change (Comparative Examples 1 to 3 in Table 1), and also has poor foaming and squeezing during rinsing. Hair cleansing composition using N-acyl acidic amino acid salt instead of component (a) (Comparative Example) 5) Comparative Examples 4 to 6 of viscosity change significantly (Table 1), on appearance is clouded, foaming inferior can be seen.
FIG. 1 shows changes in viscosity with respect to changes in pH of the hair cleaning compositions of Examples 4 to 7 and Comparative Examples 16 to 20. It can be seen from FIG. 1 that the hair cleansing compositions of Examples 4 to 7 of the present invention have a very small viscosity change rate in the weak acid region and are extremely preferable for product management. On the other hand, in the hair cleaning compositions of Comparative Examples 16 to 20, the viscosity under the weak acid region is greatly changed, and it is understood that product management is extremely difficult.
[0036]
Examples 8-27
Tables 3 to 4 show formulation examples when commercializing the composition of the present invention. From the results of Tables 3 to 4, even if compounding agents necessary for commercialization, for example, storage stabilizers, fragrances, pigments, etc., are blended, they have excellent performance in viscosity stability, foaming, and no squeaking at the time of rinsing. I understand that.
[0037]
[Table 3]

[0038]
[Table 4]

[0039]
【The invention's effect】
The hair cleansing composition of the present invention is used in weak acidity (pH 5 to 7) using an N-acyl neutral amino acid salt as a main surfactant, has a very small change in viscosity with respect to pH change, and also foams and rinses. It is also an excellent hair cleanser composition.
[Brief description of the drawings]
FIG. 1 is a graph showing changes in viscosity with respect to changes in pH of a hair cleanser composition of the present invention and a hair cleanser composition of a comparative example.

Claims (1)

Wherein at least one (a) and amphoteric surface active agent and (b) are selected from N- Ashiruarani emissions salt and N- Ashirusarukoshi emissions salt, used in weakly acidic region not including the N- acyl acidic amino acid substantially In addition, one or more polyhydric alcohols (c) selected from propylene glycol, dipropylene glycol, hexylene glycol, 1,3-butylene glycol, and glycerin are added as a viscosity stabilizer. Each component blending ratio (weight) satisfies the following formulas (A) and (B), and the total concentration of the components (a), (b), and (c) with respect to the entire composition is 10. A hair cleansing composition, characterized in that it is 0 to 30.0% by weight and the maximum / minimum value of the viscosity at pH 5 to 7 is less than 1.7.
(A) :( b) = 10: 1-10: 9 (...)
(C) / [(a) + (b)] = 0.05 to 0.20 (excluding 0.15 or more) (b)

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