JP2002029933A - Hair cosmetic - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a hair cosmetic having excellent stability, imparting hair with oiliness and softness to form hair having smooth feeling and capable of applying good smoothness in and after the rinsing of the hair treated with the cosmetic formulated with a large amount of a higher alcohol. SOLUTION: The hair cosmetic contains a cationic surfactant, a higher alcohol having a 12-28C aliphatic hydrocarbon group and water. The content of the higher alcohol is 4.5-20 wt.%. In the dynamic viscoelastic measurement of the hair cosmetic comprising the application of periodical strain having a frequency of 2 Hz to the cosmetic while varying the strain amplitude from the initial strain of 0.2% to the final strain of 100%, the strain is 2-40% when the ratio (tanδ) of the storage modulus (G') to the loss modulus (G") is 1 and both of the storage modulus and the loss modulus are 25-250 Pa at the point.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hair cosmetic, and more particularly to a hair cosmetic capable of imparting smoothness even when a high alcohol is incorporated in a large amount during rinsing and after rinsing after application to the hair. About.

[0002]

2. Description of the Related Art Hair cosmetics such as rinses, conditioners, and treatments have been used to improve the feel of hair after shampooing. These hair cosmetics contain a cationic surfactant, but the improvement in feel such as flexibility is insufficient, and therefore, a higher alcohol is used in combination.

[0003] Although this higher alcohol imparts flexibility and oiliness to the hair and improves the feel, it has a high melting point, makes preparation of a hair cosmetic containing a higher alcohol complicated, and requires the prepared hair cosmetic. There was a problem in the stability of the material (JP-A-2000-72628).

[0004] Accordingly, an object of the present invention is to provide excellent stability,
Provided is a hair cosmetic that can impart oiliness and flexibility to the hair to give a smooth feel, and can impart smoothness even when rinsing and then rinsing after application to the hair, even if a large amount of a higher alcohol is blended. Is to do.

[0005]

Means for Solving the Problems As a result of investigation, the present inventors have found that a relatively large amount of higher alcohol is blended, and in dynamic viscoelasticity measurement, the behavior changes from elastic to viscous at low strain. It has been found that the above object can be achieved by adjusting the hair cosmetic so as to have physical properties.

That is, the present invention relates to a hair cosmetic composition containing a cationic surfactant, a higher alcohol having an aliphatic hydrocarbon group having 12 to 28 carbon atoms and water, wherein the content of the higher alcohol is 4.5. In the dynamic viscoelasticity measurement, when the hair cosmetic is subjected to a periodic strain at a frequency of 2 Hz from an initial strain of 0.2% to a final strain of 100%, the storage elastic modulus (G ′) And the loss elastic modulus (G ″) is 1 to 2% when the ratio (tan δ) is 1, and the storage elastic modulus and the loss elastic modulus at that time are 25 to 250 Pa. The present invention is intended to provide a hair cosmetic composition.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, embodiments of the hair cosmetic of the present invention will be described in detail.

As the cationic surfactant used in the present invention, for example, a mono-long chain quaternary ammonium salt represented by the following general formula (1) is preferable.

[0009]

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In the formula, the number of carbon atoms of R ¹ is preferably from 16 to 24, particularly preferably 22 and is a linear or branched alkyl or alkenyl group, particularly preferably a linear alkyl group. . Examples of the anion include a chloride ion, a halogen ion such as a bromide ion, and an organic anion such as methosulfate, ethosulfate, methophosphate, and ethosulfate. Among these, a halogen ion is preferable, and a chloride ion is particularly preferable. Is preferred.

Specific examples of the cationic surfactant include cetyltrimethylammonium chloride, stearyltrimethylammonium chloride, aralkyltrimethylammonium chloride, and behenyltrimethylammonium chloride, and behenyltrimethylammonium chloride is particularly preferable. These may be used in combination of two or more.

The content of the cationic surfactant in the hair cosmetic composition of the present invention is preferably 0.01 to 20% by weight, more preferably 0.1 to 10% by weight, and most preferably 0.1 to 10% by weight.
It is 3 to 5% by weight.

The higher alcohol used in the present invention is preferably, for example, one represented by the following general formula (2).

[0014]

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In the formula, the number of carbon atoms of R ² is preferably from 16 to 24, particularly preferably 22 and is a straight-chain or branched alkyl or alkenyl group, particularly preferably a straight-chain alkyl group. .

Specific higher alcohols include cetyl alcohol, stearyl alcohol, aralkyl alcohol, behenyl alcohol, 2-octyllauryl alcohol, 2-hexyldecyl alcohol, isostearyl alcohol and the like, with behenyl alcohol being particularly preferred. These may be used in combination of two or more.

The content of the higher alcohol in the hair cosmetic composition of the present invention is 4.5 to 20% by weight, preferably 5 to 20% by weight.
10% by weight. When the content of the higher alcohol is 4.5% by weight or more, the feeling of rinsing and drying the hair is improved, and when the content is 20% by weight or less, the stability of the product is improved.

The hair cosmetic of the present invention may contain other oils in addition to the higher alcohol. As such an oil agent, silicone is preferably used.

Specific silicones include dimethylpolysiloxane, alkyl-modified polysiloxane, fluorine-modified polysiloxane, polyoxyalkylene-modified polysiloxane, carboxylic acid-modified polysiloxane, alcohol-modified polysiloxane, epoxy-modified polysiloxane, and cyclic dimethylpolysiloxane. Siloxane and the like. Among these silicones, dimethylpolysiloxane is preferably used.

The pH of the hair cosmetic composition of the present invention is 2 to 10
(25 ° C.), preferably 3 to 8 in terms of stability. To adjust the pH, organic acids such as citric acid and lactic acid,
Inorganic acids and the like can be used.

In the hair cosmetic composition of the present invention, in addition to the above-mentioned components, other components such as a viscosity modifier, an emulsifier, and an emulsifying aid, which are usually incorporated in cosmetics, can be added.

According to the dynamic viscoelasticity measurement, the hair cosmetic composition of the present invention has a storage elastic modulus when a cyclic strain of 2 Hz is applied to the hair cosmetic composition from an initial strain of 0.2% to a final strain of 100%. When the ratio (tan δ; G ″ / G ′) between (G ′) and the loss modulus (G ″) is 1, the strain is 2
４０40%. Further, the storage elastic modulus and the loss elastic modulus at that time are 25 to 250 Pa, preferably 25 to 150 P.
a. The hair cosmetic of the present invention has such physical properties as to change from elastic behavior to viscous behavior at low strain in the dynamic viscoelasticity measurement.

In the measurement of the dynamic viscoelasticity, the storage elastic modulus (G ′) and the loss elastic modulus (G ″) are parameters representing the dynamic viscoelasticity. Rheology ", Nobuko Nakahama, Hiro Ogoshi, Hatsue Moritaka (Kogaku Publishing) p. 22-26 ".

The measurement of the storage elastic modulus (G ') and the loss elastic modulus (G ") is performed using a parallel disk rheometer having a diameter of 50 mm and an interval of 1 mm.
This is performed by changing the periodic strain at a frequency of 2 Hz from the initial strain of 0.2% to the final strain of 100% at equal intervals on the logarithmic axis at 28 points, and measuring the stress at that time.

When the tan δ becomes 1, the distortion becomes 2
%, It is easy to hold the hair cosmetic when it is taken out of the container, and when it is 40% or less, the familiarity during application of the hair cosmetic is improved. Further, the storage elastic modulus and the loss elastic modulus at that time are 25 Pa or more and 250
By setting the pressure within Pa, the hair cosmetics do not cause liquid dripping, and the familiarity when the hair cosmetics are stretched is improved.

The hair cosmetic composition of the present invention comprises an aqueous phase having a temperature lower than the phase transition temperature of the oil phase, preferably an aqueous phase having a temperature of 35 ° C. or higher and lower than the phase transition temperature, and an oil phase having a phase transition temperature or higher. And emulsifying by emulsification, and a step of stirring and mixing this emulsion. In this case, it is more preferable that the temperature of the aqueous phase be lower than the melting point of the higher alcohol contained in the oil phase.
The emulsification is desirably performed by propeller stirring, homomixer stirring, static mixer mixing, or the like. The viscoelasticity of the obtained hair cosmetic is controlled by the temperature, shearing force and time during this emulsification.

The hair cosmetic of the present invention can be applied to hair rinses, hair conditioners, hair treatments, hair packs, hair creams, conditioning mousses, hair mousses, hair sprays, shampoos, leave-on treatments and the like. In particular, it is suitable as a hair cosmetic to be used after washing off a hair rinse, a hair conditioner, a hair treatment and the like.

[0028]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be specifically described below based on embodiments. In addition, the weight% in an Example shows the compounding quantity in hair cosmetics.

Example 1 An oil phase (behenyltrimethylammonium chloride 2.70 k) uniformly dissolved at 80 ° C.
g, behenyl alcohol 8.14 kg, dipentaerythritol fatty acid ester 0.16 kg, isopropyl palmitate 1.6 kg, benzyloxyethanol 0.1 g.
48 kg, hydroxyethyl cellulose 0.32 kg,
Polypropylene glycol (molecular weight 400) 1.6k
g) 15.0 kg and 75.0 kg of purified water at 44 ° C. at a flow rate of 1.5 m / s at a static mixer (C38-12-1, manufactured by Noritake Co., Limited, 11 mm inner diameter)
Element number 12) and continuously emulsified, 61
° C emulsion was obtained.

Next, 6.4 kg of lactic acid was added to this emulsion in advance.
0.30 kg of 48% NaOH, 4.8 kg of methylpolysiloxane (SH500-5000CS), purified water 5
200L into which 8.5kg was added and dissolved and dispersed at 15 ° C
The mixture was placed in a stirring tank and stirred at 90 r / min for 20 minutes with Max Blend Blade (Sumitomo Heavy Industries, Ltd., blade diameter: 0.32 m) to obtain a hair cosmetic containing 5.1% by weight of a higher alcohol at 35 ° C. .

After this hair cosmetic was left at room temperature for 24 hours, viscoelasticity was measured. The viscoelasticity measuring device was a rheometric fluid spectrometer RFSII manufactured by Rheometrics, Inc., and a parallel disk type (diameter: 50.0 mm, interval: 1.0 mm) rheometer was used. The measurement mode is
Dynamic strain sweep, measurement condition is 30
° C, frequency 2.0Hz, initial strain 0.2% to 100%
And measured. As a result, the distortion when tan δ = 1 was 8.1%, and the values of G ′ and G ″ at this time were 112 Pa.

Example 2 15.0 kg of the same oil phase as in Example 1 dissolved uniformly at 80 ° C. and purified water 9 at 35 ° C.
0.0 kg at a flow rate of 1.5 m / s using a static mixer (C38-12 manufactured by Noritake Company Limited)
-1, an inner diameter of 11 mm, and the number of elements was 12) to continuously emulsify to obtain an emulsion at 55 ° C.

Next, 6.4 kg of lactic acid was previously added to this emulsion.
0.30 kg of 48% NaOH, 4.8 kg of methylpolysiloxane (SH500-5000CS), purified water 5
200L into which 8.5kg was added and dissolved and dispersed at 20 ° C
The mixture was placed in a stirring tank and stirred at 90 r / min for 15 minutes with Max Blend Blade (Sumitomo Heavy Industries, Ltd., blade diameter: 0.32 m) to obtain a hair cosmetic containing 5.1% by weight of a higher alcohol at 33 ° C. .

After this hair cosmetic was left at room temperature for 24 hours, viscoelasticity was measured. The viscoelasticity measuring device and the measuring method were the same as in Example 1. As a result, tan δ = 1
Is 17.2%, and G ′ and G ″ at this time are
Was 47 Pa.

Example 3 An oil phase uniformly dissolved at 80 ° C. (3.6 kg of behenyltrimethylammonium chloride,
Behenyl alcohol 11.52 kg, cetanol 0.4
8 kg, dipentaerythritol fatty acid ester 0.4
8 kg, 1.6 kg of isopropyl palmitate, 0.8 kg of benzyloxyethanol, 0.32 kg of hydroxyethylcellulose, 19.6 kg of polypropylene glycol (molecular weight 400) 0.8 kg) and 70.4 kg of purified water at 44 ° C. at a flow rate of 1.5 m / s Static Mixer (C38-12 manufactured by Noritake Company Limited)
-1, an inner diameter of 11 mm and the number of elements was 12) to continuously emulsify to obtain an emulsion at 61 ° C.

Next, 3.2 ml of malic acid was previously added to this emulsion.
g, 1.6 kg of lactic acid, 0.4 kg of 48% NaOH, methylpolysiloxane (SH500-5000CS) 3.2
kg, 61.6 kg of purified water, and dissolved and dispersed at 15 ° C. in a 200 L stirring tank, and 90 r / min with a Max Blend blade (Sumitomo Heavy Industries, Ltd., blade diameter 0.32 m).
Stir for 20 minutes at 7.5 ° C at 38 ° C
Was obtained.

After the hair cosmetic was left at room temperature for 24 hours, viscoelasticity was measured. The viscoelasticity measuring device and the measuring method were the same as in Example 1. As a result, tan δ = 1
Is 31.5%, and G ′ and G ″ at this time are
Was 140 Pa.

COMPARATIVE EXAMPLE 1 15.0 kg of the same oil phase as in Example 1 dissolved uniformly at 80 ° C. and purified water 7 at 80 ° C.
5.0 kg at a flow rate of 1.5 m / s using a static mixer (C38-12 manufactured by Noritake Co., Ltd.)
−1, an inner diameter of 11 mm, the number of elements was 12), and emulsification was continuously performed to obtain an emulsion at 80 ° C.

Next, 6.4 kg of lactic acid was added to this emulsion in advance.
0.30 kg of 48% NaOH, 4.8 kg of methylpolysiloxane (SH500-5000CS), purified water 5
200L into which 8.5kg was added and dissolved and dispersed at 15 ° C
The mixture was placed in a stirring tank and stirred at 90 r / min for 40 minutes with a Max Blend Blade (Sumitomo Heavy Industries, Ltd., blade diameter: 0.32 m) to obtain a hair cosmetic containing 5.1% by weight of 35 ° C. higher alcohol. .

After the hair cosmetic was left at room temperature for 24 hours, viscoelasticity was measured. The viscoelasticity measuring device and the measuring method were the same as in Example 1. As a result, tan δ = 1
Is 52.7%, G ′ and G ″ at this time.
Was 23 Pa.

[Sensory Evaluation] The hair cosmetics (hair conditioners) prepared in Examples 1 to 3 and Comparative Example 1 were evaluated by a panelist regarding the liquid properties when taken from a container and the ease of application to hair. Table 1 shows the results of the sensory evaluation of 20 persons. This sensory evaluation was performed by taking the average of the evaluation points based on the following criteria of 20 panelists and ranking them.

Liquidity when picked up from container <Evaluation point> 4: Easily picked up by holding shape. 3: Keep the shape. 2: Slightly dripping. 1: dripping. 0; dripping and difficult to pick up.

Ease of application to hair. <Evaluation point> 4: Feeling like soaking into hair. 3: Easy to adjust to hair. 2; slightly adaptable to hair. 1; it is difficult to adjust to hair. 0; does not fit into hair.

Rank <Average evaluation point> ；: 3.5-4.0; 3.0-3.4 Δ; 2.0-2.9 ×; 1.0-1.9 ××; 0-0.9

[0045]

[Table 1]

As is clear from the results shown in Table 1, Example 1
Nos. 3 to 3 were both good in liquid properties when taken from a container and easy to apply to hair. On the other hand, Comparative Example 1 was inferior in liquid properties when taken from the container, and was not sufficiently easy to apply to hair.

[0047]

According to the hair cosmetic composition of the present invention, it is possible to apply the composition to hair even if it has excellent stability, imparts oiliness or flexibility to the hair to give a smooth feel, and especially if a large amount of higher alcohol is added. Smoothness can be imparted during and after rinsing after rinsing.

 ──────────────────────────────────────────────────の Continuing on the front page (72) Inventor Kimiaki Sato 2-1-3 Bunka, Sumida-ku, Tokyo F-term in Kao Corporation Research Laboratories (reference) 4C083 AC071 AC072 AC152 AC302 AC352 AC392 AC692 AD042 AD152 AD282 BB06 CC31 CC33 EE06 FF05

Claims (2)

[Claims] 1. A cationic surfactant having 12 to 2 carbon atoms.
8 in a hair cosmetic containing a higher alcohol having an aliphatic hydrocarbon group and water, wherein the content of the higher alcohol is 4.5 to 20% by weight, and in the dynamic viscoelasticity measurement, the hair cosmetic When a periodic strain at a frequency of 2 Hz was applied from an initial strain of 0.2% to a final strain of 100%, the ratio (tan δ) between the storage elastic modulus (G ′) and the loss elastic modulus (G ″) became 1. The strain at that time is 2 to 40%, and the storage elastic modulus and the loss elastic modulus at that time are 25 to 25.
A hair cosmetic characterized by being 0 Pa. 2. A process obtained by mixing and emulsifying a water phase having a temperature lower than the phase transition temperature of an oil phase with an oil phase having a temperature higher than the phase transition temperature, and stirring and mixing the obtained emulsion. Item 7. The hair cosmetic according to item 1.