JP2019172576A - Hair cleansing agent - Google Patents

Abstract

An object of the present invention is to provide a hair cleansing agent which does not impair the moisture of hair after drying, imparts a firm volume to the hair, and which does not impair the styling properties of the hair the next day after washing. (A) A structural unit (I) having a side chain containing a urethane bond and a glycerol skeleton and a structural unit (II) having a long alkyl chain at a terminal of the side chain are contained in a specific quantitative ratio ( (Meth) acrylic copolymer 0.005 to 0.15 mass%, (B) 0.01 to 5 mass% of a polyoxyethylene sorbitan monofatty acid ester having an average addition mole number of ethylene oxide of 60 to 100 mol, (C A hair cleanser comprising 0.05 to 5% by mass of a cationic polymer and 2 to 20% by mass of (D) an acyl amino acid salt type anionic surfactant. [Selection diagram] None

Description

  The present invention relates to a hair cleanser.

  In shampooing, conditioners and treatments are generally used after shampooing in order to compensate for the finished surface such as finger passage after drying and moisture of the hair. However, consumer demands such as not wanting to spend time on shampooing and easy care of the hair are increasing, and even after using no conditioner or treatment, the hair after drying is moderately moisturized and the finger is smooth. A hair cleansing technique called conditioning shampoo has been developed. For example, Patent Document 1 describes a shampoo in which a hair cleanser combining a cationic polymer and a silicone compound is added, and Patent Document 2 further includes a cationic surfactant to enhance the conditioning effect.

  However, if you use a shampoo that has a high conditioning effect, the conditioning ingredients remain on the hair and moisturize the hair, but the hair after drying may be damaged, or the hairstyle may be crushed and volume may not be obtained. It was.

  Therefore, for example, Patent Document 3 proposes a hair cleansing agent that has both a conditioning effect and a volume-up effect by blending an organopolysiloxane having a specific storage elastic modulus. There has been proposed a hair cleanser that is blended with polyoxyethylene fatty acid ester and has both a conditioning effect and imparting elasticity.

  However, in the studies by the present inventors, the cleaning materials of Patent Documents 3 and 4 have insufficient hair styling properties, and there is a problem that the hair on the next day after washing is particularly difficult to be collected.

Japanese Patent No. 6120870 JP 2013-136565 A Japanese Patent No. 5986568 JP 2010-163377 A

  Accordingly, an object of the present invention is to provide a hair cleansing agent that does not impair the moisture of the hair after drying, imparts a firmness volume, and does not impair the styling properties of the hair the next day after washing.

  As a result of intensive studies to solve the above problems, the present inventors have identified a structural unit having a side chain containing a urethane bond and a glycerol skeleton and a structural unit having a long alkyl chain at the end of the side chain. By blending a specific (meth) acrylic copolymer, polyoxyethylene sorbitan fatty acid ester, cationic polymer, and acylamino acid type anionic surfactant contained in a quantitative ratio at a specific quantitative ratio, The present inventors have found that a hair washing material that can solve the above problem is obtained, and have completed the present invention.

That is, the present invention has the following features.
[1] (A) A constituent unit represented by the following formula (I) and a constituent unit represented by the following formula (II) are included, and the molar ratio (I / II) of both constituent units is 90/10. 0.005 to 0.15% by mass of a (meth) acrylic copolymer that is -30/70,
(B) 0.01-5 mass% of polyoxyethylene sorbitan mono fatty acid ester whose average addition mole number of ethylene oxide is 60-100 mol,
(C) 0.05-5% by mass of a cationic polymer, and (D) 2-20% by mass of an acylamino acid salt type anionic surfactant.
A hair cleansing material characterized by containing.

(In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents — (CH ₂ ) n —, and n represents an integer of 1 to 4. * represents a binding site with another structural unit. .)

(Wherein R ³ represents a hydrogen atom or a methyl group, and L ¹ represents phenylene, cyclohexylene, —C (═O) —O—, —O—, —C (═O) —NH—, —O—). C (═O) — or —O—C (═O) —O—, wherein L ² represents a linear or branched alkyl group having 10 to 22 carbon atoms, * represents a bonding site with other structural unit. Represents.)

  ADVANTAGE OF THE INVENTION According to this invention, the hair washing agent which does not impair the moisture of the hair after drying, provides a firmness volume, and does not impair the styling property of the hair the next day after washing can be obtained.

  Hereinafter, embodiments of the present invention will be described. In the present specification, “(meth) acryloyl” means both “acryloyl” and “methacryloyl”, and “(meth) acryl” means both “acryl” and “methacryl”.

  The hair cleansing material of the present invention contains at least the following components (A) to (D).

[(A) component]
The component (A) used in the present invention has the formula (I):

(In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents — (CH ₂ ) n —, and n represents an integer of 1 to 4. * represents a binding site with another structural unit. .)
A structural unit represented by formula (II):

(Wherein R ³ represents a hydrogen atom or a methyl group, and L ¹ represents phenylene, cyclohexylene, —C (═O) —O—, —O—, —C (═O) —NH—, —O—). C (═O) — or —O—C (═O) —O—, wherein L ² represents a linear or branched alkyl group having 10 to 22 carbon atoms, * represents a bonding site with other structural unit. Represents.)
It is a (meth) acrylic-type copolymer containing the structural unit represented by these.

In the formula (I), R ¹ represents a hydrogen atom or a methyl group, and a methyl group is preferable from the viewpoint of the stability of the copolymer. R ² represents — (CH ₂ ) n —, and n is an integer of 1 to 4. That is, R ² is preferably any one of — (CH ₂ ) —, — (CH ₂ ) ₂ —, — (CH ₂ ) ₃ —, and — (CH ₂ ) ₄ — and is easily available. from - _{(CH 2) 2} - it is more preferable.

  Specific examples of the structural unit of the formula (I) include glycerol-1-methacryloyloxyethylene urethane, glycerol-1-methacryloyloxypropylene urethane, and the like. Glycerol-1-methacryloyloxyethylene urethane is preferred because of ease of synthesis.

  As a method for synthesizing a monomer that is a constituent unit of the formula (I), for example, a cyclic ketal and (meth) acryloyloxyalkylene isocyanate are prepared by a method described in JP-A-2007-119374 or a method equivalent thereto. Examples thereof include a method of subjecting a compound obtained by urethanation reaction to a hydrolytic ring-opening reaction in a water-containing solvent in the presence of a catalyst for urethanization reaction.

In the formula (II), in the formula, R ³ represents a hydrogen atom or a methyl group, and a methyl group is preferable from the viewpoint of the stability of the copolymer. L ¹ is phenylene, cyclohexylene, —C (═O) —O—, —O—, —C (═O) —NH—, —O—C (═O) —, or —O—C (═O ) -O-, among which -O- is preferred. L ² represents a linear or branched alkyl group having 10 to 22 carbon atoms, and examples thereof include a hexadecyl group, a heptadecyl group, and an octadecyl group. That is, examples of the monomer serving as the structural unit of the formula (II) include hexadecyl (meth) acrylate, heptadecyl (meth) acrylate, octadecyl (meth) acrylate, and the like. Among them, the effect of imparting moisture and elasticity. Therefore, octadecyl (meth) acrylate is preferable.

  In the component (A), the molar ratio (I / II) of the structural unit of the formula (I) to the structural unit of the formula (II) is 90/10 to 30/70. If the proportion of the structural unit of formula (I) is larger than this range, the adsorptivity to the hair tends to be poor and styling of the hair the next day tends to be difficult. If the proportion of the structural unit of formula (II) is large, In addition to the poor solubility, the hair tends to be dampened after drying. The molar ratio (I / II) is preferably 70/30 to 40/60, more preferably 60/40 to 50/50, from the viewpoint of moisturizing hair and the effect of imparting elasticity.

  (A) A component can contain structural units other than the structural unit of Formula (I), and the structural unit of Formula (II). Examples of such other structural units include isobornyl methacrylate and ethyl trimethyl ammonium chloride. When the copolymer contains a structural unit other than the structural unit of the formula (I) and the structural unit of the formula (II), the content of the other structural unit in the copolymer is the same as the structural unit of the formula (I) and the formula It is 10 mol% or less with respect to the total amount of the structural unit of (II).

  The component (A) may be a random copolymer or a block copolymer, but is preferably a random copolymer.

  The weight average molecular weight (Mw) of the component (A) is preferably from 5,000 to 500,000, more preferably from 10,000 to 200,000 from the viewpoint of moisturizing hair and ease of blending. . In addition, in order to make a (A) component easy to handle, what was diluted with polyhydric alcohols, such as glycerol and 1, 3- butylene glycol, can be used.

  In addition, a weight average molecular weight (Mw) here is measured by the gel permeation chromatography (GPC) method (polyethylene glycol conversion). The weight average molecular weight by the GPC method is calculated using a standard polyethylene glycol calibration curve with a methanol / chloroform mixed solvent (6/4 (volume ratio)) containing 0.5% by mass of lithium bromide. can do.

  The component (A) is a monomer composition containing at least a monomer that is a structural unit of the formula (I) and a monomer that is a structural unit of the formula (II) in the presence of a radical polymerization initiator. Can be prepared by polymerization by a known method such as solution polymerization in an inert gas atmosphere such as nitrogen under a condition satisfying the molar ratio (I / II). Commercial products can also be used. Moreover, as a commercial item, brand name "CERACUTE-L" [made by NOF Corporation] etc. are mentioned, for example. In addition, this commercial item (brand name “CERACUTE-L”) is a product obtained by diluting the component (A) with glycerin and 1,3-butylene glycol.

  The content of the component (A) in the hair cleansing material of the present invention is 0.005 to 0.15% by weight, preferably 0.01 to 0.1% by weight, more preferably 0.00%, based on the entire hair cleaning material. It is 02-0.05 mass%. If it is less than 0.005 mass%, the moist feeling and volume of the hair after drying will be insufficient, and the elasticity will be slightly worse. If it exceeds 0.15% by mass, the hair after drying feels sticky and squeaky, the fingering is poor, the hairstyle is crushed, the volume is lost, and the styling property of the next day is deteriorated.

[Component (B)]
(B) component used for this invention is polyoxyethylene sorbitan mono-fatty acid ester whose average addition mole number of ethylene oxide is 60-100 mol. That is, it is a nonionic surfactant obtained by adding ethylene oxide to sorbitan fatty acid ester which is a partial ester of sorbitan and fatty acid.

  Sorbitan fatty acid ester can synthesize monoester, diester and triester by changing the ratio of sorbitan and fatty acid, but sorbitan fatty acid ester used as starting material for component (B) is monoester Is preferably the main component (50 mass% or more). When a sorbitan fatty acid ester whose main component is a diester or triester is used as a starting material, the foam quality may deteriorate and the low-temperature stability may deteriorate.

  The number of moles of ethylene oxide added is 60 to 100 moles, preferably 65 to 95 moles, and more preferably 70 to 90 moles. When the added mole number of ethylene oxide is less than 60 moles, dense and creamy bubbles cannot be obtained, and the firmness and moist feeling after washing are insufficient. If the number of moles of ethylene oxide added exceeds 100 moles, the viscosity at the time of dissolution is extremely high and the handling is poor, so that the industrial production of the desired detergent tends to be difficult.

  The fatty acid in the sorbitan fatty acid ester is not particularly limited, but a saturated or unsaturated, linear or branched fatty acid having 8 to 22 carbon atoms can be used. Examples thereof include caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, oleic acid, isostearic acid and behenic acid, preferably capric acid, lauric acid and myristic acid, most preferably lauric acid. Moreover, the fatty acid derived from natural fats and oils, such as coconut oil and palm kernel oil which has lauric acid as a main component, and mixed fatty acid can also be used conveniently.

The component (B) can be used alone or in combination of two or more.
The content of the component (B) in the hair cleanser of the present invention is 0.01 to 5% by weight, preferably 0.1 to 3% by weight, more preferably 0.5 to 5%, based on the entire hair cleanser. 1.5% by mass. If it is less than 0.01% by mass, the hair feels dry after drying, and the styling property of the next day also deteriorates. If it exceeds 5% by mass, the foaming property and the fingering at the time of shampooing and drying are worsened, and the styling property of the next day is somewhat worsened.

[Component (C)]
The cationic polymer which is the component (C) used in the present invention is a polymer compound having a quaternary nitrogen-containing group that exhibits cationic properties. Specific examples include O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose, acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer, guar gum hydroxypropyltrimethylammonium chloride ether, and the like. Of these, O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride is preferred from the viewpoint of finger washing.

  In addition, the degree of cationization of the cationic polymer can be calculated from a measured value of nitrogen content such as Kjeldahl method, and 0.5 to 1.2 meq / g in terms of imparting hair volume after drying. Is preferred. The unit of cationization degree meq / g indicates the number of milliequivalents of N cation groups per 1 g of sample. In addition, the weight molecular weight (Mw) of the cationic polymer is preferably 100,000 to 1,800,000, and more preferably 300,000 to 1,500,000, particularly from the viewpoint of rapid foaming and smoothness during rinsing.

  Here, the weight average molecular weight (Mw) is measured by a gel permeation chromatography (GPC) method (in terms of polyethylene glycol). The weight average molecular weight by the GPC method is calculated using a standard polyethylene glycol calibration curve using a methanol / chloroform mixed solvent (6/4 (volume ratio)) containing 0.5% by mass of lithium bromide. can do.

Component (C) can be used alone or in combination of two or more.
The content of the component (C) in the hair cleansing material of the present invention is 0.05 to 5% by weight, preferably 0.3 to 3% by weight, more preferably 0.8 to 0.5%, based on the entire hair cleaning material. 1.5% by mass. If it is less than 0.05% by mass, the finger-feeling during shampooing and after drying is poor, and the volume is insufficient. On the other hand, when the content exceeds 5% by mass, the foaming property is poor, the hair after drying feels sticky or stiff, and the volume feeling and the styling property on the next day are deteriorated.

[(D) component]
The component (D) used in the present invention is an acyl amino acid salt type anionic surfactant. The acylamino acid salt type anionic surfactant is an anionic surfactant having an amino acid salt structure having an N-acyl group, such as N-acyl-N-methyltaurine salt, N-acylglutamate. N-acyl-N-methyl-β-alanine salt, N-acyl-β-alanine salt, N-acyl sarcosine salt, N-acyl glycine salt and the like.

  The acyl group in the acylamino acid salt type anionic surfactant is a group derived from a saturated or unsaturated fatty acid having 6 to 20 carbon atoms, and from the viewpoint of detergency and foaming power, the acyl group has 8 to 8 carbon atoms. 18 is preferable, and 12 to 14 is more preferable. In addition, an acyl group derived from a mixed fatty acid can be used, and examples of the acyl group derived from the mixed fatty acid include a coconut oil fatty acid acyl group and a palm kernel oil fatty acid acyl group. The acyl group is preferably lauroyl group, myristoyl group, palmitoyl group, stearoyl group, oleoyl group, coconut oil fatty acid acyl group, palm kernel oil fatty acid acyl, more preferably lauroyl group, myristoyl group, coconut oil fatty acid. An acyl group and a palm kernel oil fatty acid acyl group, particularly preferably a lauroyl group, a palm oil fatty acid acyl group, and a palm kernel oil fatty acid acyl group.

  The counter ion forming the salt contained in the acylamino acid type anionic surfactant is not particularly limited, and hydrogen atom; alkali metal atom such as sodium and potassium; 1 such as 1/2 calcium and 1/2 magnesium / 2 Alkaline earth metal atoms; Organic ammonium such as ammonium and triethanolammonium; Amino acids (basic amino acids such as lysine and arginine; neutral amino acids such as glycine sodium, glycine potassium, sodium sarcosine, and β-alanine sodium; Acidic amino acids such as sodium, dipotassium glutamate, and disodium aspartate); taurine salts such as taurine sodium and taurine potassium; N-methyl taurine salts such as N-methyltaurine sodium and N-methyltaurine potassium;Among these, preferred are alkali metal atoms such as sodium and potassium, and taurine salts such as taurine sodium and taurine potassium.

  Specific examples of the component (D) include, for example, coconut oil fatty acid sodium glutamate, coconut oil fatty acid acyl potassium aspartate, coconut oil fatty acid acyl glycine sodium, coconut oil fatty acid acyl glycine potassium, lauroyl sarcosine sodium, lauroyl-N-methyl- β-alanine sodium, N-coconut oil fatty acid acyl-L-glutamic acid triethanolamine, coconut oil fatty acid acyl-N-methyltaurine sodium and the like.

The component (D) can be used alone or in combination of two or more.
Content of (D) component in the hair washing material of this invention is 2-20 mass% with respect to the whole hair washing material, Preferably it is 4-15 mass%, More preferably, it is 6-12 mass%. If it is less than 2% by mass, foaming properties, fingering at the time of shampooing and after drying will be poor, and volume and elasticity will be insufficient. On the other hand, if the content exceeds 20% by mass, smooth finger passage cannot be obtained during rinsing, and the volume of hair may become insufficient over time.

  The hair cleansing material of the present invention is generally used for hair cleaning materials within the range not impairing the effects of the present invention, in addition to the component (A), the component (B), the component (C), and the component (D). It can contain various components.

  For example, anionic surfactants other than the component (D) such as polyoxyethylene (3) sodium lauryl ether sulfate, betaine-type amphoteric surfactants, imidazolinium betaine-type amphoteric surfactants, sulfobetaine-type amphoteric surfactants Nonionic surfactants such as amphoteric surfactants, fatty acid alkanolamide type nonionic surfactants, amine oxide type nonionic surfactants, polyoxyethylene alkyl ether type nonionic surfactants, Cationic surfactants such as alkyltrimethylammonium chloride and dialkyldimethylammonium chloride, pearlescent agents such as ethylene glycol distearate and triethylene glycol distearate, 1,3-butylene glycol, propylene glycol, dipropylene glycol, glyceride Moisturizers such as glycerin, diglycerin, isoprene glycol, protein hydrolysates, oils such as squalane, jojoba oil, olive oil, castor oil, lanolin, lecithin, highly polymerized methylpolysiloxane, dimethylsiloxane methyl (polyoxyethylene) siloxane Silicone derivatives such as copolymers, preservatives such as paraben and phenoxyethanol, bactericides such as salicylic acid, isopropylmethylphenol, triclosan, zinc pyrithione, piroctone olamine, pH adjusters such as citric acid and sodium citrate, edetate And sequestering agents such as hydroxyethanediphosphonic acid, antioxidants such as dibutylhydroxytoluene and tocopherol acetate, extracts derived from animals and plants, pigments, and fragrances.

  The hair washing agent of the present invention is produced according to a conventional method, and its dosage form is arbitrary. Typically, the above essential components ((A) component, (B) component, (C) component, and (D) component) and optionally blended components are dissolved in water, and heated and cooled until uniform. Manufactured by mixing. As the water, ion-exchanged water, purified water, tap water, natural water or the like can be used, and can be freely blended according to the dosage form of the hair washing material. Examples of the dosage form include a transparent liquid form, a pearl liquid form, a paste form, a cream form, and a gel form, but a transparent liquid form and a pearl liquid form are particularly preferable.

  EXAMPLES Hereinafter, although an Example demonstrates this invention concretely, this invention is not limited by a following example. The blending amount is mass% unless otherwise specified.

[Examples 1-7, Comparative Examples 1-4]
According to the formulations shown in Tables 1 and 2, hair washing materials (shampoos) of Examples 1 to 7 and Comparative Examples 1 to 4 were prepared by a conventional method, and the following “feeling of moisture after drying” and “harnessing after drying” ”,“ Volume of hair after drying ”, and“ styling property on the next day ”were evaluated according to the following evaluation criteria, and“ ◎ ”and“ ◯ ”were evaluated as acceptable for each item. The results are shown in Tables 1 and 2.
In addition, the numerical value of each component in prescription of Table 1, 2 is content (mass%) per whole washing | cleaning material containing a common component and the remainder purified water.
Table 3 shows the details of the common additive components in Tables 1 and 2.

[Evaluation items and evaluation criteria]
(1) Moisture feeling after drying 20 men and women (24 to 58 years old) are panelists, and after washing their hair with shampoo, without using a conditioner, the moisture feeling after 1 hour after drying is described below. The total score of 20 people was calculated | required and it evaluated by the following criteria.
2 points: very moisturizing hair 1 point: slightly moisturizing hair 0 points: no moisturizing hair

(2) Harness after drying 20 men and women (24 to 58 years old) are panelists, and after washing their hair with shampoo, without using a conditioner, after about 1 hour after hair drying, Judgment was made and the total score of 20 people was obtained and evaluated according to the following criteria.
2 points: The sharpness is felt very much 1 point: The sharpness is felt a little 0 points: No sharpness is felt

(3) Hair volume after drying 20 men and women (24 to 58 years old) are panelists, and after washing their hair with shampoo, without using a conditioner, the hair volume 1 hour after drying is as follows. The total score of 20 people was calculated | required and it evaluated by the following criteria.
2 points: I feel a lot of volume
1 point: I feel a little volume
0 points: no volume

(4) Styling characteristics for the next day
Hair styling when 20 men and women (24-58 years old) are panelists, wash their hair with shampoo, do not use a conditioner, and dry and set their hair 24 hours later using a styling agent About sex, it determined as follows, the total score of 20 persons was calculated | required, and the following determination criteria evaluated.
2 points: easy to style 1 point: easy to style 0 point: difficult to style

[Criteria]
◎: Total score is 35 points or more ○: Total score is 30 points to less than 35 points △: Total score is 25 points to less than 30 points ×: Total score is less than 25 points

* 1: R ^{1 of the} formula (I) contained in “Ceracte-L” manufactured by NOF Corporation is 60 mol% of a structural unit in which n is 2, and R ^{3 of the} formula (II) is a methyl group, L ¹ Is a methacrylic copolymer (weight average molecular weight 50,000) containing 40 mol% of a structural unit in which L ² is an octadecyl group, and the numbers in the table indicate the “Ceracte” of the methacrylic copolymer. -L ”is the content of the entire hair cleansing material containing“ L ”.
(Ceracte-L composition: methacrylic copolymer 5 mass%, glycerin 66.5 mass%, 1,3-butylene glycol 28.5 mass%)
* 2: “(80E.O.)” of polyoxyethylene sorbitan monolaurate (80E.O.) indicates that the average added mole number of ethylene oxide is 80.
* 3: “(20E.O.)” of polyoxyethylene sorbitan monooleate (20E.O.) indicates that the average added mole number of ethylene oxide is 20.
* 4: O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride having a cationization degree of 0.8 meq / g and a weight average molecular weight of 400,000 (Toho Kagaku Co., Ltd .: Katchinal LC100)
* 5: O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose chloride having a cationization degree of 1.3 meq / g and a weight average molecular weight of 1,000,000 (Toho Chemical Co., Ltd .: Katchinal HC200)

  As is clear from Examples 1 to 7, all of the hair washing agents of the present invention did not impair the moisture of the hair after drying, imparted a harshness volume, and had good styling on the next day. On the other hand, in Comparative Examples 1-4, sufficient effect is not acquired. That is, in Comparative Example 1, since the component (A) was not blended, the moisture after drying was insufficient, and the styling property and the styling property on the next day were slightly bad. In Comparative Example 2, since the component (B) was not blended, the sharpness was insufficient, and the moisture after drying and the styling property on the next day were slightly bad. In addition, in Comparative Example 3 in which polyoxyethylene sorbitan monooleate having an average addition mole number of ethylene oxide of 20 was blended in place of the component (B), the dryness was insufficient, the volume after drying and the next day The styling of was bad. In Comparative Example 4, since sodium polyoxyethylene lauryl ether sulfate is blended in place of the component (D), the moisture after drying, the elasticity, the styling on the next day is slightly insufficient, and the volume feeling is small. It was.

Claims (1)

(A) The structural unit represented by the following formula (I) and the structural unit represented by the following formula (II) are included, and the molar ratio (I / II) of both structural units is 90/10 to 30 / 70 (meth) acrylic copolymer 0.005-0.15 mass%,
(B) 0.01-5 mass% of polyoxyethylene sorbitan mono fatty acid ester whose average addition mole number of ethylene oxide is 60-100 mol,
(C) 0.05-5% by mass of a cationic polymer, and (D) 2-20% by mass of an acylamino acid salt type anionic surfactant.
A hair cleansing material characterized by containing.
(In the formula, R ¹ represents a hydrogen atom or a methyl group, R ² represents — (CH ₂ ) n —, and n represents an integer of 1 to 4. * represents a binding site with another structural unit. .)

(Wherein R ³ represents a hydrogen atom or a methyl group, and L ¹ represents phenylene, cyclohexylene, —C (═O) —O—, —O—, —C (═O) —NH—, —O—). C (═O) — or —O—C (═O) —O—, wherein L ² represents a linear or branched alkyl group having 10 to 22 carbon atoms, * represents a bonding site with other structural unit. Represents.)