Hair softening agent and hair cosmetic for promoting hair softness

Abstract

To provide a softness-promoting agent for hair for improving the softness and smoothness of the hair, and to provide a hair cosmetic for promoting the softness of the hair.SOLUTION: The above problem is solved by a softness-promoting agent for hair, which contains the following component (A) as an active ingredient. Furthermore, the above problem is solved by a hair cosmetic for promoting the softness of the hair, which contains the following component (B) or (C) in the softness-promoting agent for hair. The components are: (A) bisdiglyceryl polyacyladipate-2; (B) hydroxyethyl cellulose; and (C) hydrogenated polyisobutene.SELECTED DRAWING: None

Description

Technical Field

[0001] The present invention relates to a hair cosmetic for promoting the softness of hair.

Background Art

[0002] In daily hair care, hair cosmetics such as rinses, conditioners, and treatments are widely used to improve the feel of hair after shampooing.

[0003] These hair cosmetics vary according to the desired feel of the hair, and formulations have been proposed that soften hard, difficult-to-run-through hair to improve run-through, and formulations that impart a moist feeling to limp, unruly hair to improve cohesion.

[0004] In addition, hair cosmetics containing specific silicones and cationic surfactants have been proposed to improve the moist feeling and cohesion of hair (Cited Document 1). However, while these proposals are satisfactory in terms of the moist feeling, cohesion, and smoothness of hair, they result in a heavy finish, thus losing the good run-through and softness of the hair.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] The present invention has been made in view of the above circumstances, and an object thereof is to provide a hair cosmetic for promoting the softness of hair.

Means for Solving the Problems

[0007] The inventors, through diligent research to achieve the objectives of the present invention, discovered that using bis-diglyceryl polyacyladipate-2 improves the softness and smoothness of hair. Furthermore, they found that by combining a hydrocarbon oil that is liquid at 25°C with a nonionic cellulose derivative oil, they were able to obtain a hair cosmetic that improves the softness and smoothness of hair, and after drying, makes the hair manageable, easy to comb, and moisturized. Thus, the present invention was completed.

[0010] First invention It contains the following ingredients (A) to (C). death, The amount of component (A) is 0.1 to 5.0% by mass. The amount of component (B) is 0.5 to 2.0% by mass. The amount of component (C) is 0.5 to 1.0% by mass. This is a hair cosmetic product characterized by the following: (A) Bis-diglyceryl polyacyladipate-2 (B) Hydroxyethylcellulose (C) Hydrogenated Polyisobutene [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a hair flexibility enhancer that improves the softness and smoothness of hair. Furthermore, it is possible to provide a hair cosmetic that not only improves the softness and smoothness of hair after drying, but also improves the manageability of the hair after drying. [Modes for carrying out the invention]

[0013] The present invention will be described in detail below.

[0014] In this invention, "hair flexibility" refers to a state in which hair bends without resistance when force is applied to bend it, and returns to its original state when the force is removed.

[0015] <Hair softening agent> The hair flexibility enhancer of the present invention can be incorporated into hair rinses, hair conditioners, hair treatments, hair packs, hair creams, leave-on treatments, etc., and it is important to use component (A).

[0016] <(A) Bis-Diglyceryl Polyacyladipate-2> The component (A) used in the hair flexibility enhancer of the present invention is bis-diglyceryl polyacyladipate-2. Bis-diglyceryl polyacyladipate-2 is a diester of adipic acid with a mixed diglyceryl of caprylic acid, capric acid, stearic acid, isostearic acid, and hydroxystearic acid. Component (A) is commonly used in lip cosmetics, makeup cosmetics, skincare cosmetics, and cleansing products for its water-retaining emollient effect, gloss-enhancing properties, and pigment dispersion.

[0017] In this invention, we have found that when component (A) is used in hair cosmetics, it not only improves moisture retention through its water-retaining emollient effect, but also imparts flexibility and smoothness to the hair. This is presumed to be due to the effect of component (A) filling the gaps inside the hair, thereby increasing the elasticity of the hair.

[0018] The amount of ingredient (A) is preferably 0.1% by mass or more, and more preferably 5.0% by mass or less, relative to the hair cosmetic. Within this range, the softness of the hair after drying is particularly good.

[0019] <Hair Cosmetics> The hair cosmetic composition of the present invention can be used in hair rinses, hair conditioners, hair treatments, hair packs, hair creams, leave-on treatments, etc. Furthermore, the hair cosmetic composition of the present invention can be manufactured by conventional methods, and its dosage form is not particularly limited. Specifically, it can be used in appropriate dosage forms such as cream or emulsion. It can also be in aerosol or non-aerosol form, and in the case of non-aerosol, it can take various forms such as squeeze-former and pump-former types.

[0020] The hair cosmetic of the present invention (A) Bis-diglyceryl polyacyl adipate-2 (B) Hydroxyethyl cellulose (C) Hydrogenated polyisobutene is characterized by containing the following. Hereinafter, each component in the hair cosmetic of the present invention will be described in detail as follows.

[0021] <(B) Hydroxyethyl cellulose> The component (B) used in the hair cosmetic of the present invention is hydroxyethyl cellulose. Hydroxyethyl cellulose is a component that enhances the protective colloid property and water retention of the composition and has excellent film-forming ability, and is used as a component that contributes to the smoothness and good cohesion of hair after drying.

[0022] The blending amount of the component (B) is not particularly limited as long as the effects of the present invention can be exhibited, but it is preferably 0.01 to 2.0% by mass based on the hair cosmetic. If the blending amount is 0.01% by mass or more, the smoothness of the hair will be particularly good, and if it is 2.0% by mass or less, the hair will have a non-greasy finish.

[0023] <(C) Hydrogenated polyisobutene> The component (C) used in the hair cosmetic of the present invention is hydrogenated polyisobutene. Hydrogenated polyisobutene is a branched saturated hydrocarbon, which is obtained by polymerizing isobutene or copolymerizing isobutene and n-butene and then hydrogenating it, and is represented by the following general formula (1).

[0024]

Chemical formula

[0025] Specific examples of these include Pearlream EX, Pearlream 6 (manufactured by NOF Corporation), and Luvitol Lite (manufactured by BASF). Component (C) penetrates to fill the gaps within the hair, suppressing frizz and flyaways caused by dryness, and is therefore used as an ingredient that contributes to the manageability of hair after drying.

[0026] The amount of component (C) is not particularly limited as long as it can exert the effects of the present invention, but it is preferably 0.1 to 2.0% by mass relative to the hair cosmetic. Within this range of amounts, a particularly good moisturizing effect is achieved.

[0027] Therefore, by combining the above components (A), (B), and (C), the hair cosmetic of the present invention exhibits the effect of improving the softness and smoothness of the hair after drying, as well as improving the manageability of the hair.

[0028] <Other ingredients> In addition to the above-mentioned ingredients, the hair cosmetic composition of the present invention may also contain other ingredients commonly used in hair cosmetic compositions, as long as they do not impair the effects of the present invention.

[0029] Such ingredients include, for example, higher alcohols such as stearyl alcohol and behenyl alcohol; cationic surfactants such as behentrimonium chloride and steartrimonium chloride; higher fatty acids such as stearic acid, behenic acid, and lanolin fatty acid; silicones such as highly polymerized silicones and polyether-modified silicones; high molecular weight compounds such as cationized cellulose and poly(diallyldimethylammonium chloride); anti-dandruff components such as zinc pyrithione and benzalkonium chloride; lower alcohols such as ethanol, methanol, propyl alcohol, and isopropyl alcohol; organic acids such as lactic acid and citric acid; polyols such as DPG and propylene glycol; and other UV absorbers, preservatives, sugars, fragrances, colorants, metal ion sequestering agents, antioxidants, various chemicals, and water. [Examples]

[0030] Next, the hair cosmetic composition of the present invention will be specifically described by illustrating examples and comparative examples, but the present invention is not limited in any way by these examples. First, the test methods and evaluation methods used in each example will be described.

[0031] (Test method for assessing the finish of hair after use) After applying 3g of the hair cosmetic according to the examples and comparative examples of the present invention to a 10g hair bundle, it was rinsed with 40°C water for 10 seconds, the wet hair bundle was combed 20 times, towel-dried for 5 seconds, and then dried with a hairdryer until it felt completely dry.

[0032] A panel of 20 trained professionals evaluated the softness (hair bends without resistance), smoothness (slipping smoothly when stroked), manageability, manageability (no snagging when fingers are run through the hair), and moisture level (hair feels full of moisture) of the hair after drying, according to the evaluation criteria below. The average of the sum of the scores from the 20 individuals was calculated.

[0033] <Evaluation Criteria for Hair Softness After Drying> 5 points: Very soft 4 points: Quite soft 3 points: A little soft 2 points: A little hard 1 point: Quite hard

[0034] <Evaluation Criteria for Hair Smoothness After Drying> 5 points: Very smooth 4 points: Quite smooth 3 points: Slightly smooth 2 points: A little stiff 1 point: Quite stiff

[0035] <Evaluation Criteria for Hair Manageability After Drying> 5 points: Very well put together. 4 points: Quite cohesive. 3 points: It comes together a little 2 points: Slightly widens 1 point: It spreads quite a lot.

[0036] <Evaluation Criteria for Hair Smoothness After Drying> 5 points: Very smooth to the touch. 4 points: Very smooth to the touch. 3 points: Slightly smooth to the touch 2 points: It's a little difficult to run your fingers through. 1 point: It's quite difficult to run your fingers through it.

[0037] <Evaluation Criteria for Hair Moisture After Drying> 5 points: Very moisturizing 4 points: Very moisturizing. 3 points: Slightly moist. 2 points: A little dry 1 point: Quite dry

[0038] [Table 1]

[0039] [Table 2]

[0040] [Table 3]

[0041] As is clear from Tables 1-3, the hair cosmetic composition according to the present invention showed superior performance compared to the hair cosmetic composition of the comparative example.

[0042] The effects of the hair flexibility enhancer of the present invention were confirmed by adding it to commercially available products. Commercial product X (conditioner manufactured by Kracie Home Products Co., Ltd.) was used as Test Example 1, and commercial product X with component (A) added was used as Test Example 2, and each test was conducted (Table 4). As a result, in Test Example 2 with component (A) added, the softness and smoothness of the hair after drying were improved.

[0043] [Table 4]

[0044] The following are other formulation examples of the hair cosmetic composition of the present invention. These hair cosmetic compositions were also evaluated for their manageability, smoothness, and manageability upon drying. In all examples, they exhibited excellent properties and were deemed satisfactory.

[0045] [Table 5]

[0046] [Table 6]

Claims

1. It contains the following components (A) to (C), The amount of component (A) is 0.1 to 5.0% by mass. The amount of component (B) is 0.5 to 2.0% by mass. A hair cosmetic comprising 0.5 to 1.0% by mass of component (C). (A) Bis-diglyceryl polyacyladipate-2 (B) Hydroxyethylcellulose (C) Hydrogenated polyisobutene

2. The hair cosmetic composition according to Claim 1, wherein the amount of component (A) is 3.0 to 5.0% by mass.

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