Hair composition and hair treatment method

Abstract

To provide a composition capable of increasing hair strength and a hair treatment method employing the composition.SOLUTION: A hair composition of the present invention contains a vegetable oil having an iodine value of 140 or more in an amount of 0.5-15 mass%, and is characterized in that it contains no water or contains water in an amount of 5 mass% or less. A hair treatment method of the present invention is characterized by using the hair composition of the present invention.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a hair composition and a hair treatment method using the same. [Background technology]

[0002] Various ingredients are blended into compositions used as hair cosmetics, and recently, many attempts have been made to blend vegetable oils (for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-77639 Summary of the Invention [Problem to be solved by the invention]

[0004] As shown in Patent Document 1, hair compositions have also been proposed that contain oily ingredients such as vegetable oils but are water-free or contain relatively little water. Such hair compositions tend to leave oily ingredients such as vegetable oils on the hair, and are excellent at imparting an oily feel to the hair.

[0005] On the other hand, recently, there has been an extremely high demand for permanent wave treatment, hair straightening treatment, hair dyeing treatment, etc., and the damage that occurs to hair as a result of these treatments has become a problem. In particular, hair that has been damaged in the above manner is prone to losing strength, so there is a demand for the development of a hair composition that can increase that strength.

[0006] The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a composition that can increase the strength of hair, and a hair treatment method using the same. [Means for solving the problem]

[0007] The present inventors have conducted extensive research in light of the above circumstances and have found that adding a predetermined amount of vegetable oil with a relatively high iodine value to a hair composition that does not contain water or has a relatively low water content can increase hair strength. Based on this finding, the present inventors have completed the present invention.

[0008] The hair composition of the present invention comprises: Vegetable oil with an iodine value of 140 or more is blended in an amount of 0.5% by mass or more and 15% by mass or less, It is characterized by not containing water or having a water content of 5% by mass or less.

[0009] The hair treatment method of the present invention is characterized by using the hair composition of the present invention. [Effects of the Invention]

[0010] According to the present invention, it is possible to provide a composition capable of increasing hair strength and a hair treatment method using the same. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, the present invention will be described based on an embodiment of the present invention (hereinafter referred to as the present embodiment).

[0012] <Hair composition> The hair composition of this embodiment contains vegetable oil with an iodine value of 140 or more in an amount of 0.5% by mass or more and 15% by mass or less, and does not contain water or the water content is 5% by mass or less.

[0013] (Vegetable oil with an iodine value of 140 or more) The hair composition of this embodiment contains a vegetable oil having an iodine value of 140 or more in an amount of 0.5% by mass to 15% by mass. When the hair composition of this embodiment is applied to hair and a certain period of time has passed, the vegetable oil having an iodine value of 140 or more attached to the surface of the hair is oxidized by air to form a film. This film then improves hair strength. Therefore, even for hair damaged by treatments such as permanent wave treatment, hair straightening treatment, and hair dyeing, the use of the hair composition of this embodiment can restore hair strength to that of healthy hair. Furthermore, treatment with the hair composition of this embodiment can improve the combability (freedom from tangling) and moisturizing feel of hair, and can also reduce hair stickiness.

[0014] The iodine value can be measured in accordance with the iodine value measurement method of the Quasi-drug Raw Materials Standards 2021 (the values ​​shown in the examples below are measured using this method).

[0015] The hair composition of the present embodiment may contain one or more vegetable oils having an iodine value of 140 or more.

[0016] Examples of vegetable oils having an iodine value of 140 or more in the hair composition of this embodiment include linseed oil, pomegranate seed oil, perilla seed oil, safflower oil, evening primrose oil, Plukenetia volubilis seed oil, kukui nut oil, walnut seed oil, cranberry seed oil, European rubus seed oil, black currant seed oil, canina rose fruit oil, salvia hispanica seed oil, and kiwi seed oil.

[0017] From the viewpoint of further enhancing hair strength, the hair composition of this embodiment preferably contains a vegetable oil having an iodine value of 175 or more as the vegetable oil having an iodine value of 140 or more. Examples of vegetable oils having an iodine value of 175 or more include linseed oil, perilla seed oil, pomegranate seed oil, Salvia hispanica seed oil, and Plukenetia volubilis seed oil. When a vegetable oil having an iodine value of 175 or more adheres to the surface of hair, a stronger coating is formed by the air oxidation of the vegetable oil. This coating is believed to further improve hair strength.

[0018] As the vegetable oil with an iodine value of 140 or more to be blended into the hair composition of this embodiment, linseed oil is particularly preferred because it has a better effect of increasing the strength of the hair after treatment, and furthermore, it can ensure a better balance of the effects of improving the ease of combing hair, increasing the moist feeling of hair, and reducing hair stickiness.

[0019] The amount of vegetable oil having an iodine value of 140 or more in the hair composition of this embodiment is 0.3% by mass or more, preferably 0.5% by mass or more, and more preferably 2% by mass or more, from the viewpoint of better ensuring the effect of increasing hair strength after treatment. Note that, if the amount of vegetable oil having an iodine value of 140 or more in the hair composition of this embodiment is increased, the effect of increasing hair strength after treatment is improved, but the effects of improving hair combability, increasing hair moisturization, and reducing hair stickiness may be reduced. Therefore, from the viewpoint of further improving hair combability and moisturization after treatment and better reducing stickiness, the amount of vegetable oil having an iodine value of 140 or more in the hair composition of this embodiment is 15% by mass or less, preferably 13% by mass or less, more preferably 7% by mass or less, and even more preferably 5% by mass or less.

[0020] (Water content) The hair composition of this embodiment does not contain water or the water content is 5% by mass or less. Therefore, the hair composition of this embodiment may contain water as long as the water content is 5% by mass or less. When the hair composition of this embodiment contains water, the water content is preferably 3% by mass or less, more preferably 1% by mass or less, even more preferably 0.5% by mass or less, even more preferably 0.1% by mass or less, and particularly preferably 0.05% by mass or less, from the viewpoint of imparting a superior oily feel to hair. It is most preferable that the hair composition of this embodiment does not contain water (the water content is 0% by mass).

[0021] (Vegetable oil or ester oil with an iodine value of less than 140) The hair composition of the present embodiment may be a blend of, for example, one or more vegetable oils or ester oils having an iodine value of less than 140. In the following description, "vegetable oils or ester oils having an iodine value of less than 140" may be referred to as "vegetable oils, etc. having an iodine value of less than 140."

[0022] Vegetable oils with an iodine value of less than 140 may be drying oils (vegetable oils with an iodine value of 130 or more but less than 140) with an iodine value of less than 140, semi-drying oils (vegetable oils with an iodine value of more than 100 but less than 130), or non-drying oils (vegetable oils with an iodine value of 100 or less).

[0023] Examples of vegetable oils having an iodine value of less than 140 include drying oils having an iodine value of less than 140, such as soybean oil; rice bran oil, orange seed oil, carrot seed oil, canola oil, apricot kernel oil, peach kernel oil, almond oil, crambe abyssinica seed oil, sesame oil, rice germ oil, watermelon seed oil, grapefruit seed oil, tomato seed oil, passionflower seed oil, wheat germ oil, and corn oil. Semi-drying oils; non-drying oils such as horseradish seed oil, mango seed oil, macadamia nut oil, hazelnut oil, castor oil, camellia seed oil, meadowfoam oil, tea seed oil, olive fruit oil (olive oil), camellia oil, camellia seed oil, pistachio seed oil, baobab seed oil, argania spinosa kernel oil, papaya seed oil, sclerocarya birrea seed oil, peanut oil, and avocado oil.

[0024] The ester oil is, for example, an ester oil that is liquid at 25° C. Here, "liquid at 25° C." means that it exhibits fluidity at 25° C. (The same applies to the following descriptions.) Note that, as the ester oil that is liquid at 25° C., for example, an ester oil having a melting point of 20° C. or lower may be used.

[0025] Specific examples of ester oils include esters of straight-chain fatty acids and lower alcohols such as isopropyl myristate, butyl myristate, isopropyl palmitate, ethyl oleate, ethyl linoleate, and isopropyl linoleate; esters of straight-chain fatty acids and higher straight-chain alcohols such as cetyl caprylate, hexyl laurate, decyl myristate, decyl oleate, and oleyl oleate; isostearyl laurate, isotridecyl myristate, isocetyl myristate, isostearyl myristate, 2-octyldodecyl myristate, and palmitate. Esters of straight-chain fatty acids and branched alcohols such as octyl palmitate, isocetyl palmitate, isostearyl palmitate, octyl stearate, isocetyl stearate, isodecyl oleate, and 2-octyldodecyl oleate; esters of branched fatty acids and lower alcohols such as ethyl isostearate and isopropyl isostearate; esters of branched fatty acids and straight-chain higher alcohols such as cetyl ethylhexanoate and hexyl isostearate; ethylene glycol dioctanoate, ethylene glycol dioleate, and propylene glycol dicaprylate. Fatty acids and polyhydric alcohols such as cholesteryl, propylene glycol dicaprylate, propylene glycol dicaprate, propylene glycol dioleate, neopentyl glycol diheptanoate, neopentyl glycol caprate, neopentyl glycol di-2-ethylenehexanoate, glyceryl tricaprylate, glyceryl trioctanoate, glyceryl triisopalmitate, glyceryl triisostearate, trimethylolpropane trioctanoate, trimethylolpropane triisostearate, and pentaerythritol tetraoctanoate esters of branched fatty acids and branched alcohols such as 2-octyldodecyl neopentanoate, isocetyl octanoate, isocetyl octanoate, isostearyl octanoate, ethylhexyl isononanoate, isononyl isononanoate, 2-hexyldecyl dimethyloctanoate, 2-octyldodecyl dimethyloctanoate, octyl isopalmitate, isocetyl isostearate, and isostearyl isostearate; jojoba oil, jojoba seed oil; and other ester oils that are liquid at 25°C. One or more of these may be used.

[0026] Furthermore, the hair composition of this embodiment may contain a vegetable oil having an iodine value of less than 140 in combination with an ester oil.

[0027] When the hair composition contains a vegetable oil having an iodine value of less than 140, the effect of improving the ease of combing hair, the effect of increasing the moist feeling of hair, and the effect of reducing stickiness of hair can be ensured in a better balance. On the other hand, when the hair composition contains an ester oil as the vegetable oil having an iodine value of less than 140, for example, the moist feeling of hair after treatment decreases, but the effect of increasing hair strength is further improved.

[0028] In order to provide excellent moisturizing feeling to hair, the hair composition of this embodiment preferably contains a vegetable oil having an iodine value of less than 140 as the vegetable oil having an iodine value of less than 140. In addition, in order to further increase the strength of hair, the hair composition of this embodiment preferably contains an ester oil as the vegetable oil having an iodine value of less than 140.

[0029] The hair composition of this embodiment may contain one or more vegetable oils selected from rice bran oil, olive oil, apricot kernel oil, and ethylhexyl isononanoate as vegetable oils, etc. having an iodine value of less than 140. From the viewpoint of further increasing hair strength, the hair composition of this embodiment preferably contains one or more vegetable oils, etc. having an iodine value of less than 140, selected from olive oil, apricot kernel oil, and ethylhexyl isononanoate.

[0030] The amount of vegetable oil or ester oil having an iodine value of less than 140 in the hair composition of this embodiment (when the hair composition contains only vegetable oil or ester oil having an iodine value of less than 140, the amount is the vegetable oil; when the hair composition contains both vegetable oil and ester oil, the total amount is the total amount) is determined by the amount of vegetable oil having an iodine value of 140 or more and the amounts of other components to be added to the hair composition as needed, and is, for example, from 30% by mass to 99.5% by mass. However, from the viewpoint of providing an oily feel to hair, the amount is preferably from 50% by mass to 99.5% by mass.

[0031] (silicone) The hair composition of this embodiment may contain silicone. However, the incorporation of silicone may reduce the moist feeling of the treated hair. Therefore, it is desirable to limit the amount of silicone contained in the hair composition of this embodiment. Therefore, in order to reduce the possibility of reducing the moist feeling of the treated hair, it is preferable that the hair composition of this embodiment does not contain silicone or that the amount of silicone contained is less than 5% by mass.

[0032] When silicone is blended into the hair composition of this embodiment, the blending amount is preferably less than 5% by mass, more preferably 3% by mass or less, even more preferably 1% by mass or less, even more preferably 0.5% by mass or less, and particularly preferably 0.1% by mass or less, from the viewpoint of reducing the possibility of a decrease in the moist feeling of the hair after treatment. It is most preferable that the hair composition of this embodiment does not blend silicone (the blending amount of silicone is 0% by mass).

[0033] Specific examples of silicones include methylphenylpolysiloxane, decamethyltrisiloxane, dimethicone (methylpolysiloxane, highly polymerized methylpolysiloxane), decamethylcyclopentasiloxane, polyoxyethylene-methylpolysiloxane copolymer, aminoethylaminopropylsiloxane-dimethylsiloxane copolymer emulsion, aminoethylaminopropylmethylsiloxane-dimethylsiloxane copolymer, trimethylsiloxysilicate, methylhydrogenpolysiloxane, caprylyl methicone, and lauryl dimethicone.

[0034] In addition to the above-mentioned components, various components commonly used in hair cosmetics can be added to the hair composition of this embodiment as needed, provided that the effects of the present invention are not impaired. Examples of such added components include hydrocarbons that are liquid at 25° C., higher alcohols that are liquid at 25° C., fatty acids that are liquid at 25° C., lower alcohols, antioxidants, ultraviolet absorbers, preservatives, and fragrances.

[0035] Specific examples of hydrocarbons that are liquid at 25°C include liquid paraffin, liquid isoparaffin, light isoparaffin, light liquid isoparaffin, squalane, isododecane, hydrogenated farnesene, (C9-12) alkanes, (C10-13) alkanes, (C13,14) alkanes, and (C13-15) alkanes.

[0036] Examples of higher alcohols that are liquid at 25° C. include alcohols having a branched structure or alcohols having an unsaturated bond, each having 12 to 22 carbon atoms. Specific examples of alcohols having a branched structure include octyldodecanol, isostearyl alcohol, hexyldecanol, and decyltetradecanol, and specific examples of alcohols having an unsaturated bond include oleyl alcohol and jojoba alcohol.

[0037] Specific examples of fatty acids that are liquid at 25°C include oleic acid, isostearic acid, linoleic acid, and linolenic acid.

[0038] The hair composition of the present embodiment may be a non-aqueous hair composition. Note that the term "non-aqueous hair composition" means that the outer phase of the hair composition is an oil phase.

[0039] The viscoelasticity value, which is an index of viscosity of the hair composition of the present embodiment, can be measured, for example, using a rheometer (for example, a stress-controlled rheometer "Rheo Stress 6000" (trade name) manufactured by HAAKE) at a shear rate of 100 s under the conditions of a measurement temperature of 25°C, a diameter of a cone-plate sensor of 35 mm, an inclination angle of the cone-plate sensor of 2°, a steady flow curve mode, and a waiting time of 1 minute. -1 The viscoelasticity measured is 5 mPa·s or more and 100 mPa·s or less.

[0040] (Dosage form) The formulation of the hair composition of this embodiment may be selected appropriately, and examples thereof include liquid, cream, wax, paste, solid, foam, and mist.

[0041] (Application) The hair composition of the present embodiment can be used for, for example, hair care applications (e.g., shampoo, hair treatment, hair treatment with styling function, one component of a multi-component hair treatment, etc.), hair styling applications, hair coloring applications (e.g., temporary hair dyes, semi-permanent hair dyes, permanent hair dyes (non-oxidative hair dyes, oxidative hair dyes), bleaches, bleaching agents), permanent wave applications, straight perm applications (hair relaxers, etc.), and hair care or growth applications (hair tonics, hair growth agents, etc.). The hair treatment may be a leave-in hair treatment or a rinse-off hair treatment.

[0042] The hair composition of the present embodiment may be, for example, at least one of a hair care composition, a hair styling composition, a hair coloring composition, a permanent wave composition, a straight perm composition, a hair care composition, and a hair growth composition.

[0043] From the viewpoint of further increasing the strength of hair, the hair composition of the present embodiment is preferably a hair composition used in a leave-in manner. Examples of hair compositions used in a leave-in manner include hair oils and leave-in treatments.

[0044] The hair composition of the present embodiment can be produced by employing a known method for producing a hair composition according to the formulation.

[0045] <Hair treatment method> The hair treatment method of this embodiment uses the hair composition of this embodiment described above. When treating hair with the hair treatment method of this embodiment, for example, a procedure can be adopted in which an appropriate amount of the hair composition is applied to the surface of dry hair, and after a certain period of time (about 180 to 480 minutes), the hair is treated without rinsing off the hair composition. Alternatively, a procedure can be adopted in which an appropriate amount of the hair composition is applied to the surface of wet hair, and after a certain period of time (about 180 to 480 minutes), the hair is dried and treated without rinsing off the hair composition. [Example]

[0046] The present invention will be described in detail below based on examples. However, the following examples do not limit the present invention. In Tables 1 to 5 below, the amount of each component is shown in % so that the total hair composition is 100%, but all of these % are mass %. Furthermore, in these tables, the % indication is omitted, and only the numerical value indicating the amount is shown. Note that although some comparative examples described below contain only a single component, in this specification these will also be referred to as "hair composition" or "composition" in line with the examples.

[0047] Experiment 1: Examples 1 to 5 and Comparative Example 1 Linseed oil and rice bran oil were used to prepare hair compositions of Examples 1 to 5 and Comparative Example 1 by mixing them in a conventional manner to obtain the compositions shown in Table 1. The linseed oil used had an iodine value of 175 or more.

[0048] A number of black hair tresses (20 cm long, each weighing 5 g) were collected from the same Japanese female and assigned to five evaluators who routinely evaluate hair compositions. Each evaluator treated the hair tresses using the hair compositions of Examples 1 to 5 and Comparative Example 1 according to the following procedure.

[0049] First, the hair bundle was rinsed with water, then washed with an experimental shampoo (a 13.5% by mass aqueous solution of sodium polyoxyethylene lauryl ether sulfate), rinsed with water, and then dried. After drying, 0.06 g of any of the hair compositions of Examples 1 to 5 and Comparative Example 1 was applied to the hand and left for 24 hours. Thereafter, the hair bundle was washed with the experimental shampoo, rinsed with water, and then dried to complete the treatment.

[0050] The hair bundles after the treatment were evaluated for feel (fingers running through them (no snagging), moist feeling (moisturizing feeling) and non-stickiness), and the torsional rigidity was measured.

[0051] (Evaluation of hair feel after treatment) The ease of running fingers through the hair, moist feeling, and non-stickiness of the hair after treatment were evaluated by each of the above evaluators, who assigned scores in increments of 1 point, with treatment with the hair composition of Example 5 being the standard (1 point), treatment slightly better than the standard being 2 points, treatment somewhat better than the standard being 3 points, treatment significantly better than the standard being 4 points, and treatment very much better than the standard being 5 points, and then calculating the average score of each evaluator (N=5).

[0052] (Measurement of torsional rigidity of treated hair) First, a 2 cm length of hair was cut from the treated hair bundle, located 5 cm from the end, and randomly collected to serve as a measurement sample. Twenty measurement samples were prepared from each of the hair bundles treated with the hair compositions of the Examples and Comparative Examples. The torsional stress of these measurement samples was measured at a twisting rotation speed of 120° / sec and a twisting rotation number of ±3 revolutions. This torsional stress was measured using a torque-sensing torsion measuring device "KES-YN-1 (trade name)" manufactured by Kato Tech Co., Ltd. Furthermore, the diameter of the hair after the deformation treatment was measured to obtain the polar moment of inertia. The torsional stress values ​​obtained with a torsion angle θ ranging from 2π to 4π were used to calculate the rigidity modulus G (GPa) according to the following formula. All rigidity measurements were performed at 25°C and a relative humidity of 50%.

[0053] G = B×L / (θ×Ip) (In the above formula, B: torsional stress, L: hair sample length, Ip: polar moment of inertia, and θ: torsional angle.)

[0054] The average value of the measured values ​​obtained from the 20 measurement samples for each Example and Comparative Example was calculated and used as the torsional rigidity modulus of the hair treated with the hair composition of each Example and Comparative Example.

[0055] These results are also shown in Table 1.

[0056] [Table 1]

[0057] As shown in Table 1, hair treated with the hair compositions of Examples 1 to 5, which contain an appropriate amount of linseed oil, a vegetable oil with an iodine value of 140 or more, had a higher torsional rigidity and improved strength than hair treated with the composition of Comparative Example 1, which does not contain the vegetable oil.

[0058] When comparing the feel of hair treated with the hair compositions of Examples 1 to 5, the hair treated with the composition of Example 5, which contained 15% by mass of linseed oil, a vegetable oil with an iodine value of 140 or more, was the worst in terms of ease of running fingers through, moist feeling, and non-stickiness, although all of these were at a practical level for a hair composition. Furthermore, it was confirmed that the feel of hair treated with the hair compositions of Examples 1 to 5 tended to improve as the amount of linseed oil was reduced.

[0059] Experiment 2: Examples 6-7 The hair compositions of Examples 6 and 7 were prepared by mixing perilla seed oil, safflower oil, and rice bran oil in a conventional manner to obtain the compositions shown in Table 2. The perilla seed oil used had an iodine value of 175 or more. The safflower oil used had an iodine value of 140 or more but less than 175.

[0060] A portion of the hair bundle prepared in Experiment 1 (not used in Experiment 1) was used and treated with the hair compositions of Examples 6 and 7 in the same manner as in Experiment 1. Then, the feel of the treated hair bundle (ease of running fingers through it, moist feeling, and lack of stickiness) was evaluated, and the torsional rigidity was measured in the same manner as in Experiment 1.

[0061] Regarding the feel of the hair after treatment, each of the above evaluators assigned a score in increments of 1 point, with treatment with the hair composition of Example 3 being the standard (3 points), much better than the standard being 5 points, slightly better than the standard being 4 points, slightly worse than the standard being 2 points, and much worse than the standard being 1 point, and the evaluation was carried out by calculating the average score of each evaluator (N=5).

[0062] These results are also shown in Table 2. Table 2 also shows the results when the hair composition of Example 3 was used.

[0063] [Table 2]

[0064] As shown in Table 2, hair treated with the hair compositions of Examples 6 and 7, which used perilla seed oil or safflower oil as the vegetable oil with an iodine value of 140 or more, had a higher torsional rigidity (0.896 GPa) than hair treated with the composition of Comparative Example 1, similar to hair treated with the hair composition of Example 3 containing linseed oil, and thus showed improved strength. Furthermore, hair treated with the hair compositions of Examples 3 and 6, which used linseed oil or perilla seed oil with an iodine value of 175 or more, had a higher torsional rigidity than hair treated with the hair composition of Example 7, which used safflower oil with an iodine value of 140 or more but less than 175. These results demonstrate that the use of a vegetable oil with an iodine value of 175 or more as the vegetable oil with an iodine value of 140 or more results in a superior torsional rigidity. Furthermore, the feel of the hair treated with the hair compositions of Examples 6 and 7 was as good as that of the hair treated with the hair composition of Example 3.

[0065] Experiment 3: Comparative Example 2 Hair compositions were prepared in the same manner as in Example 1, except that the amounts of linseed oil and rice bran oil were changed to those shown in Table 3.

[0066] A plurality of hair bundles were prepared in the same manner as in Experiment 1, except that black hair collected from a different Japanese woman than the hair bundle used in Experiment 1 was used. These hair bundles were treated with the hair composition of Comparative Example 2 in the same manner as in Experiment 1. These hair bundles were also treated with the hair composition of Comparative Example 1. Then, the feel of the hair of the treated hair bundles (ease of running fingers through the hair, moist feeling, and lack of stickiness) was evaluated, and the torsional rigidity was measured in the same manner as in Experiment 1.

[0067] Regarding the feel of the hair after treatment, each of the above evaluators assigned a score in increments of 1 point, with treatment using the hair composition of Comparative Example 1 as the standard (3 points), much better than the standard as 5 points, slightly better than the standard as 4 points, slightly worse than the standard as 2 points, and much worse than the standard as 1 point, and the evaluation was carried out by calculating the average score of each evaluator (N=5).

[0068] The torsional rigidity of the treated hair was measured in the same manner as for the hair treated with the composition of Example 1, except that 10 samples were used for measurement. The average value of these measurements was calculated and used as the torsional rigidity of the hair treated with the hair compositions of Comparative Example 1 and Comparative Example 2.

[0069] In Experiment 3, the feel of the hair treated with the hair composition of Comparative Example 1 was evaluated and the torsional rigidity was measured again because the hair strands used for treatment in Experiment 1 and those used for treatment in Experiment 3 were collected from different individuals and had different feel and strength before treatment, making it difficult to directly compare the evaluation and measurement results in Experiment 1 with those in Experiment 3 (the same applies to Experiments 4 and 5 described below).

[0070] These results are also shown in Table 3.

[0071] [Table 3]

[0072] As shown in Table 3, hair treated with the hair composition of Comparative Example 2, which contained too little linseed oil (a vegetable oil with an iodine value of 140 or more) at 0.1%, had a low torsional rigidity and insufficient strength, similar to hair treated with the composition of Comparative Example 1.

[0073] Experiment 4: Examples 8 to 12 The hair compositions of Examples 8 to 12 were prepared by mixing linseed oil, olive oil, apricot kernel oil, ethylhexyl isononanoate, and dimethicone (kinematic viscosity of 5 cs at 25°C) in a conventional manner to obtain the compositions shown in Tables 4 and 5.

[0074] Using some of the hair bundles prepared in Experiment 3 (not used in Experiment 1), hair treatments were carried out with the hair compositions of Examples 8 to 12 in the same manner as in Experiment 3. These hair bundles were also treated with the hair composition of Example 3. Then, the feel of the hair in the treated hair bundles (ease of running fingers through the hair, moist feeling, and lack of stickiness) was evaluated, and the torsional rigidity was measured in the same manner as in Experiment 3.

[0075] Regarding the feel of the hair after treatment, each of the above evaluators assigned a score in increments of 1 point, with treatment with the hair composition of Example 3 being the standard (3 points), much better than the standard being 5 points, slightly better than the standard being 4 points, slightly worse than the standard being 2 points, and much worse than the standard being 1 point, and the evaluation was carried out by calculating the average score of each evaluator (N=5).

[0076] These results are shown in Tables 4 and 5.

[0077] [Table 4]

[0078] As shown in Table 4, hair treated with the hair compositions of Examples 8 to 11, which used other vegetable oils or ester oils instead of rice bran oil, had higher torsional rigidity and showed excellent strength-enhancing effects compared to hair treated with the hair composition of Example 3, which contained rice bran oil.

[0079] The hair treated with the compositions of Examples 10 and 11, which used ester oil, had a less moist feeling than the hair treated with the compositions of Examples 3, 8 and 9, which used only vegetable oil. In addition, when comparing the hair treated with the compositions of Examples 3, 8 and 9, which used only vegetable oil, the hair treated with the composition of Example 3, which used rice bran oil, had a particularly good balance of smoothness, moist feeling and non-stickiness.

[0080] [Table 5]

[0081] Furthermore, as shown in Table 5, hair treated with the hair composition of Example 12, which contained 5% by mass of dimethicone (silicone), felt less moist and was more sticky than hair treated with the composition of Example 3, which did not contain dimethicone.

[0082] Hair was treated in the same manner as in Example 12 with the hair compositions prepared by replacing 5% by mass of the rice bran oil in the hair compositions of Examples 1, 3, and 5 with dimethicone (kinematic viscosity at 25°C: 5 cs), the hair composition prepared by replacing 5% by mass of the ethylhexyl isononanoate in the hair composition of Example 10 with dimethicone (kinematic viscosity at 25°C: 5 cs), and the hair composition prepared by replacing 2.5% by mass of the rice bran oil and 2.5% by mass of the ethylhexyl isononanoate in the hair composition of Example 11 with dimethicone (kinematic viscosity at 25°C: 5 cs), and the feel of the treated hair was evaluated. Although these hair compositions all contained 5% by mass of the silicone dimethicone, the treated hair felt less moist than hair treated with the composition of Example 3.

[0083] These results show that, from the perspective of improving the feel of treated hair, it is preferable to limit the amount of silicone in the hair composition to less than 5% by mass.

Claims

1. A vegetable oil having an iodine value of 140 or more is blended in an amount of 0.5% by mass or more and 15% by mass or less, A hair composition that does not contain water or contains 5% by mass or less of water.

2. 2. The hair composition according to claim 1, wherein the vegetable oil having an iodine value of 140 or more comprises a vegetable oil having an iodine value of 175 or more.

3. 3. The hair composition according to claim 2, wherein the vegetable oil having an iodine value of 175 or more is one or more selected from the group consisting of linseed oil, perilla seed oil, pomegranate seed oil, salvia hispanica seed oil, and pulkenetia volubilis seed oil.

4. 3. The hair composition according to claim 1, further comprising one or more vegetable oils or ester oils having an iodine value of less than 140.

5. 3. The hair composition according to claim 1, wherein the composition does not contain silicone or the amount of silicone contained is less than 5% by mass.

6. A hair treatment method using the hair composition according to claim 1 or 2.

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