Hair composition and hair treatment method

Abstract

To provide a hair composition capable of suppressing deterioration of elongation that tends to occur when increasing the storage elastic modulus and a sticky feeling in hair after application, and a hair treatment method using the composition.SOLUTION: A hair composition is an oil-in-water type and comprises hydroxypropyl starch phosphoric acid and / or a salt thereof and an acrylic acid / alkyl methacrylate copolymer. In the composition, the amount of the hydroxypropyl starch phosphoric acid and the salt thereof is 1.5% by mass or more. The composition comprises no solid wax and solid hydrocarbon or comprises them in amount of 25% by mass or less. A hair treatment method uses an oil-in-water hair composition comprising hydroxypropyl starch phosphoric acid and / or a salt thereof and an acrylic acid / alkyl methacrylate copolymer. In the composition, the amount of the hydroxypropyl starch phosphoric acid and the salt thereof is 1.5% by mass or more. The composition comprises no solid wax and solid hydrocarbon or comprises them in amount of 25% by mass or less.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a hair composition suitable as a hair styling agent and a hair treatment method using said composition. [Background technology]

[0002] Hydroxypropyl starch phosphate and its salts are one of the ingredients blended into hair compositions such as hair styling agents, and can be used as a thickener that adjusts the viscosity, which affects the feel of the composition, etc. Patent Document 1 discloses an example of a hair composition blended with hydroxypropyl starch phosphate or a salt thereof, such as a hair styling agent blended with hydroxypropyl starch phosphate, waxes or hydrocarbons that are solid at 25° C., higher fatty acids, an alkali agent, and water. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2011-98929 A Summary of the Invention [Problem to be solved by the invention]

[0004] Meanwhile, hair compositions have storage moduli required depending on their applications and methods of use. In particular, in hair styling products, the storage modulus of the composition is related to hair styling properties, and an increase in the storage modulus is likely to lead to poor spreadability of the composition when applied to hair and a sticky feel when touching the hair after application.

[0005] In view of the above circumstances, the present invention aims to provide a hair composition that can suppress the deterioration of elongation and sticky feeling on hair after application that often accompany increasing the storage modulus, and a hair treatment method using said composition. [Means for solving the problem]

[0006] The present inventors have conducted extensive research into oil-in-water hair compositions containing hydroxypropyl starch phosphate and / or a salt thereof, and as a result have discovered that by incorporating an acrylic acid / alkyl methacrylate copolymer, setting the amount of hydroxypropyl starch phosphate and its salts to 1.5 mass % or more, and setting the amount of solid wax and solid hydrocarbon to zero or to 25 mass % or less, it is possible to suppress the deterioration of elongation that tends to accompany an increase in storage modulus, and the sticky feel of the hair after application, which have led to the completion of the present invention.

[0007] That is, the hair composition of the present invention is an oil-in-water type hair composition, which contains hydroxypropyl starch phosphate and / or a salt thereof and an acrylic acid-alkyl methacrylate copolymer, and is characterized in that the content of the hydroxypropyl starch phosphate and its salt is 1.5 mass% or more, and the content of solid wax and solid hydrocarbon is zero or is 25 mass% or less.

[0008] The storage modulus of the hair composition according to the present invention at 25° C. is, for example, 300 Pa or more and 4000 Pa or less.

[0009] The hair composition according to the present invention preferably contains water in an amount of 50% by mass or more, which is suitable for spreading the composition and preventing stickiness of hair.

[0010] In the hair composition according to the present invention, the blending amount of the acrylic acid / alkyl methacrylate copolymer is preferably 0.05% by mass or more. A blending amount of 0.05% by mass or more is suitable for increasing the storage modulus.

[0011] The hair composition according to the present invention is preferably blended with a higher fatty acid-based anionic surfactant, which can suppress fluidization when the composition is left in a car, which can become hot in summer.

[0012] The hair treatment method according to the present invention is characterized by using the hair composition according to the present invention. Effect of the Invention

[0013] The oil-in-water hair composition of the present invention contains hydroxypropyl starch phosphate and / or its salt and an acrylic acid-alkyl methacrylate copolymer, and the amount of hydroxypropyl starch phosphate and its salt is 1.5 mass % or more, and solid wax and solid hydrocarbon are zero or 25 mass % or less. This increases the storage modulus and suppresses both the deterioration of elongation and stickiness of hair after application that tend to accompany the increase in storage modulus.

[0014] Furthermore, according to the hair treatment method of the present invention, an oil-in-water type hair composition is used which contains hydroxypropyl starch phosphate and / or a salt thereof and an acrylic acid-alkyl methacrylate copolymer, and in which the content of the hydroxypropyl starch phosphate and a salt thereof is 1.5 mass % or more and the content of solid wax and solid hydrocarbon is zero or 25 mass % or less. Therefore, the hair composition has excellent spreadability and reduces stickiness of the hair after application. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] The present invention will be described below based on the embodiments of the present invention. The hair composition according to this embodiment contains hydroxypropyl starch phosphate and / or a salt thereof and an acrylic acid-alkyl methacrylate copolymer, and is of oil-in-water formulation type (the amount of water in the hair composition according to this embodiment is, for example, 50% by mass or more). In addition, the hair composition according to this embodiment may contain optional components that are contained in known hair styling products, etc., as required.

[0016] (Hydroxypropyl starch phosphate and / or its salts) The hydroxypropyl starch phosphate contained in the hair composition of the present embodiment is a hydroxypropyl ether of a diester of phosphoric acid and starch. Examples of hydroxypropyl starch phosphate salts include alkali metal salts such as sodium salt and potassium salt, alkaline earth metal salts such as calcium and magnesium, organic amine salts such as ammonium salt, triethanolamine salt and triethylamine salt, and basic amino acid salts such as lysine salt and arginine salt.

[0017] The hair composition of this embodiment contains one or more selected from hydroxypropyl starch phosphate and hydroxypropyl starch phosphate salts. The amount of hydroxypropyl starch phosphate and hydroxypropyl starch phosphate salts in the hair composition of this embodiment is 1.5% by mass or more, preferably 2.0% by mass or more, and preferably 2.5% by mass or more. When the amount is 1.5% by mass or more, the storage modulus can be easily increased. On the other hand, the upper limit of the amount is preferably less than 5.0% by mass, preferably less than 4.5% by mass, and more preferably less than 4.0% by mass, from the viewpoint of reducing costs.

[0018] (acrylic acid / alkyl methacrylate copolymer) The acrylic acid / alkyl methacrylate copolymer blended in the hair composition of this embodiment is known as a polymer emulsifier that enables dispersion of oily components by the alkyl group having 10 or more carbon atoms introduced therein. By blending 1.5% by mass or more of hydroxypropyl starch phosphate and its salts and blending the acrylic acid / alkyl methacrylate copolymer, it is possible to increase the storage modulus while suppressing deterioration in elongation and stickiness of hair after application.

[0019] The acrylic acid-alkyl methacrylate copolymer may be selected from known ones, for example, acrylic acid-alkyl methacrylate (C10-30) copolymer, and commercially available products include "Pemulen TR-1 Polymeric Emulsifier" and "Pemulen TR-2 Polymeric Emulsifier" manufactured by Lubrizol Advanced Materials. The amount of the acrylic acid-alkyl methacrylate copolymer in the hair composition of the present embodiment is preferably 0.05% by mass or more, preferably 0.1% by mass or more, more preferably 0.2% by mass or more, and even more preferably 0.25% by mass or more, from the viewpoint of increasing the storage modulus and dispersibility of the oil phase. On the other hand, the upper limit of the amount of the acrylic acid-alkyl methacrylate copolymer is preferably 2.0% by mass or less, preferably 1.0% by mass or less, and more preferably 0.5% by mass or less. When it is 2.0% by mass or less, it is suitable for suppressing the stiff feel of hair that is easily caused by the acrylic acid-alkyl methacrylate copolymer.

[0020] (Alkaline agent) In the hair composition of this embodiment, the alkaline agent is blended to allow the acrylic acid / alkyl methacrylate copolymer to exhibit its function as a polymer emulsifier (function of dispersing oily components).

[0021] Examples of the alkaline agent include organic alkalis such as 2-amino-2-methyl-1-propanol, monoethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, and arginine; and inorganic alkalis such as hydroxides of alkali metals (potassium hydroxide, sodium hydroxide, and the like), ammonia, sodium bicarbonate, and sodium carbonate. In the hair composition of this embodiment, it is preferable to blend one or more types of alkaline agents, and the blending amount of the alkaline agent is, for example, 0.05% by mass or more and 1.0% by mass or less.

[0022] (Oily Phase Components) In order to realize an oil-in-water composition, the hair composition of the present embodiment contains an oil phase component. The oil phase component is a known oil phase component that is solid and / or liquid at 25° C. and is insoluble or poorly soluble in water, i.e., separates into two phases, an oil phase and a water phase, when mixed with water.

[0023] The oily component is, for example, wax, hydrocarbon, silicone, ester oil, fat (mainly composed of a triester of fatty acid and glycerin), and higher alcohol, and it is preferable to blend one or more oil phase components in the hair composition of this embodiment.

[0024] When the hair composition of the present embodiment is blended with a liquid oil (an oily component that is liquid at 25° C.), it is suitable for adjusting the spreadability of the composition. The blended amount of the liquid oil in the hair composition of the present embodiment is, for example, 5% by mass or more and 20% by mass or less.

[0025] The hair composition of the present embodiment may contain a solid wax, a solid hydrocarbon, or a solid wax and a solid hydrocarbon as an oil phase component that is solid at 25° C. The solid wax and / or solid hydrocarbon improves hair styling properties.

[0026] Examples of the solid wax include candelilla wax, beeswax, Japan wax, carnauba wax, rice bran wax, lanolin, etc. Examples of the solid hydrocarbon include microcrystalline wax, paraffin, petrolatum, ceresin, etc.

[0027] The hair composition of this embodiment may contain one or more solid waxes and solid hydrocarbons. The amount of solid wax and solid hydrocarbon in the hair composition of this embodiment is 25% by mass or less, preferably 20% by mass or less, more preferably 15% by mass or less, more preferably 10% by mass or less, and even more preferably 5% by mass or less, from the viewpoint of suppressing the deterioration of the spreadability of the composition and the stickiness of hair (the solid wax and solid hydrocarbon may not be contained in order to suppress the deterioration of spreadability and the sticky feel of hair). The lower limit of the amount of solid wax and solid hydrocarbon in the hair composition of this embodiment is preferably 1.0% by mass, and more preferably 3.0% by mass. When the amount is 1.0% by mass or more, the hair styling property is excellent.

[0028] (optional ingredient) The optional components to be blended in the hair composition of the present embodiment may be appropriately selected from components blended in known hair styling products, as described above. The optional components include higher fatty acid anionic surfactants (higher fatty acids, higher fatty acid salts, or higher fatty acids and higher fatty acid salts), nonionic surfactants (the blending amount is, for example, 2.0% by mass or more and 7.0% by mass or less), powders, organic acids, organic acid salts, preservatives, fragrances, etc.

[0029] When a higher fatty acid-based anionic surfactant is blended into the hair composition of this embodiment, fluidization caused by temperature rise in a car in summer can be suppressed. This fluidization is caused by a decrease in oil phase dispersibility, and the higher fatty acid-based anionic surfactant makes it possible to suppress the decrease in oil phase dispersibility of the solid wax and / or solid hydrocarbon and to suppress the fluidization. The blending of the higher fatty acid-based anionic surfactant is carried out by blending a higher fatty acid, a higher fatty acid salt, or a higher fatty acid and a higher fatty acid salt. In order for the higher fatty acid to function as an anionic surfactant, the fatty acid needs to be anionic in the hair composition of this embodiment, so when a higher fatty acid is blended, the above-mentioned alkaline agent that neutralizes it is appropriately blended.

[0030] Examples of the higher fatty acid include linear saturated fatty acids such as stearic acid, lauric acid, myristic acid, palmitic acid, behenic acid, and isostearic acid; branched saturated fatty acids such as isostearic acid; and linear unsaturated fatty acids such as oleic acid and linoleic acid. The carbon number of the higher fatty acid is preferably 14 to 20. A carbon number of 14 or more is good for suppressing irritation felt by the skin, and a carbon number of 20 or less is good for softening the feel of the composition of the present embodiment. In addition, examples of the higher fatty acid salt include sodium salts, potassium salts, ammonia salts, and aminoethylpropanol salts of the linear saturated fatty acids, branched saturated fatty acids, and linear unsaturated fatty acids.

[0031] One or more higher fatty acid anionic surfactants may be blended in the hair composition of this embodiment, and the blending amount is, for example, 0.5% by mass or more and 3.0% by mass or less.

[0032] (Storage modulus) The storage modulus of the hair composition of this embodiment at 25°C is preferably 300 Pa or more and 4000 Pa or less, and more preferably 900 Pa or more and 4000 Pa or less. Such a storage modulus is suitable for use as a hair styling agent. Here, the storage modulus is the value when the stress is 10.0 Pa using a rheometer (for example, a stress-controlled rheometer "Rheo Stress 6000" manufactured by HAAKE) with a cone-plate sensor diameter of 35 mm, an inclination angle of 2°, a waiting time of 1 minute, and measurement mode conditions of stress-dependent dynamic viscoelasticity measurement, stress of 0.1 Pa to 1000 Pa, and frequency of 1 Hz.

[0033] (pH) The pH of the hair composition of the present embodiment at 25° C. is, for example, from 5.5 to 7.0, and preferably from 6.0 to 7.0. A pH of 5.5 or more is suitable for dispersibility of oil phase components.

[0034] (How to use) The hair composition of the present embodiment is used in a hair treatment method in which the composition is applied to hair. For example, the composition is suitable for use as a hair styling agent that is spread between the palm of the hand and applied to the hair, or a leave-in treatment. EXAMPLES

[0035] The present invention will be described in detail below based on examples. However, the present invention should not be construed as being limited to the descriptions of these examples. Hair compositions of Examples and Comparative Examples were produced and evaluated for "storage modulus," "flow suppression," "elongation," and "suppression of sticky feeling of hair." Details are as follows.

[0036] (Hair composition) The oil-in-water hair compositions of the examples and comparative examples were produced using hydroxypropyl starch phosphate, acrylates / alkyl acrylate (C10-30) crosspolymer ("Pemulen TR-1 Polymeric Emulsifier" manufactured by Lubrizol Advanced Materials), "Pemulen TR-2 Polymeric Emulsifier" manufactured by the same company, hydroxyethyl cellulose, carboxyvinyl polymer, microcrystalline wax, candelilla wax, stearic acid, lipophilic glyceryl monostearate, polyoxyethylene cetyl ether (20E.O.), 2-ethylhexyl palmitate, decamethylcyclopentasiloxane, phenoxyethanol, potassium hydroxide, fragrance, and water. The ingredients other than water blended during the production and their blending amounts are as shown in Tables 1 and 2 below, and the pH of the hair compositions at 25°C was within the range of 6.0 to 7.0.

[0037] (Storage modulus) The storage modulus (G') at 25°C and 50°C was measured using a HAAKE Rheo Stress 6000 with a cone-plate sensor diameter of 35 mm, an inclination angle of 2°, a waiting time of 1 minute, and measurement mode conditions of stress-dependent dynamic viscoelasticity measurement, stress of 0.1 Pa to 1000 Pa, and frequency of 1 Hz, and G' was measured at a stress of 10.0 Pa.

[0038] (flow suppression) A 50 ml glass screw cap bottle filled with the hair composition of the Example or Comparative Example was left for 10 days in an atmosphere at 50° C. Immediately after leaving it, the screw cap bottle was tilted at 45°, and the fluidity of each hair composition was visually confirmed within 3 seconds and recorded as follows. ○: No fluidity was observed ×: Fluidity was observed

[0039] (Extended) About 0.5 g of the hair composition of the Example or Comparative Example was spread on the palm, and the ease of spreading was evaluated. The evaluation here was a 5-point scale in which each of four evaluators scored 1 to 5 points (the best spreadability was scored as "5" and the worst spreadability was scored as "1") as a relative evaluation of all of Examples 1a to 1b, Comparative Examples 1a to 1e, and Examples 2a to 2b. The average score of all the evaluators was taken as the evaluation of "spreadability."

[0040] (Prevents sticky feeling on hair) About 1 g of the hair composition of the Example or Comparative Example was spread on the palm and then applied to the hair for styling, and the sticky feel when touching the hair after styling was evaluated. The evaluation here was a 5-point scale in which each of four evaluators scored 1 to 5 points (a score of "5" was given for the evaluation in which the sticky feel was most suppressed, and a score of "1" was given for the evaluation in which the sticky feel was most suppressed) as a relative evaluation of all of Examples 1a to 1b, Comparative Examples 1a to 1e, and Examples 2a to 2b. The average score given by all the evaluators was taken as the evaluation of "suppression of sticky feel of hair".

[0041] Table 1 below shows the components and amounts blended in the hair compositions of Examples 1a to 1b and Comparative Examples 1a to 1e, as well as the evaluation results.

[0042] [Table 1]

[0043] In the above Table 1, (1) a comparison between Examples 1a to 1b and Comparative Example 1a shows that the storage modulus is easier to increase by using hydroxypropyl starch phosphate and an acrylic acid / alkyl methacrylate copolymer in combination than by increasing the amount of hydroxypropyl starch phosphate; (2) a comparison between Examples 1a to 1b and Comparative Example 1b shows that when hydroxypropyl starch phosphate and an acrylic acid / alkyl methacrylate copolymer are used in combination, the storage modulus is significantly increased when the amount of hydroxypropyl starch phosphate is 1.5% by mass or more; (3) A comparison of Examples 1a-1b with Comparative Examples 1c-1d confirms that the use of an acrylic acid / alkyl methacrylate copolymer as a component to be used in combination with hydroxypropyl starch phosphate is more suitable for "elongation" and "suppression of sticky feeling of hair" than hydroxyethyl cellulose or carboxyvinyl polymer; (4) a comparison of Examples 1a-1b with Comparative Example 1e confirms that Comparative Example 1e, which contains more than 25 mass% of solid wax and solid hydrocarbons (candelilla wax, microcrystalline wax), is inferior in "elongation" and "suppression of sticky feeling of hair".

[0044] Table 2 below shows the components and amounts blended in the hair compositions of Examples 2a to 2b, as well as the evaluation results. [Table 2]

[0045] From Table 2 above, it can be seen that the incorporation of a higher fatty acid-based anionic surfactant (stearic acid) improved the "fluidity suppression" when left in an atmosphere at 50°C.

Claims

1. An oil-in-water hair composition comprising: Hydroxypropyl starch phosphate and / or a salt thereof, an acrylic acid / alkyl methacrylate copolymer, and a higher fatty acid-based anionic surfactant are blended, The amount of the hydroxypropyl starch phosphate and its salts is 1.5% by mass or more, No solid wax or solid hydrocarbon is blended or the blended amount is 25 mass% or less. A hair composition comprising:

2. 2. The hair composition according to claim 1, which has a storage modulus at 25° C. of 300 Pa or more and 4,000 Pa or less.

3. The hair composition according to claim 1 or 2, wherein the blending amount of water is 50% by mass or more.

4. The hair composition according to any one of claims 1 to 3, wherein the blending amount of the acrylic acid / alkyl methacrylate copolymer is 0.05% by mass or more.

5. A hair composition described in any one of claims 1 to 4, which contains an alkaline agent.

6. A method for treating hair, comprising using the hair composition according to any one of claims 1 to 5.

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