JP2023133044A - Hair treatment agent and hair treatment method - Google Patents

Abstract

To provide a hair treatment agent and a hair treatment method capable of suppressing hair damage or repairing damaged hair without deteriorating the functions of a hair straightening agent, a permanent wave agent, a heated permanent wave agent, an oxidative hair dye, and a decolorant (bleaching agent).SOLUTION: According to the present invention, damaged hair can be repaired by a hair treatment agent consisting of alkylene carbonate and hair treatment methods of: applying the hair treatment agent as a pre-treatment agent before applying a first agent for straightening hair, a first agent for permanent wave, a first agent for heated permanent wave, an oxidative hair dye, and a decolorant (bleaching agent) to the hair; suppressing hair damage without deteriorating functions of a permanent wave agent, a heated permanent wave agent, an oxidative hair dye, and a decolorant (bleaching agent) by uniformly mixing the hair treatment agent with the first agent for straightening hair, the first agent for permanent wave, the first agent for heated permanent wave, the oxidative hair dye, and the decolorant (bleaching agent), or applying the hair treatment agent before applying an aqueous base agent other than the first agent for straightening hair, the first agent for permanent wave, the first agent for heated permanent wave, the oxidative hair dye, and the decolorant (bleaching agent), to the hair; and applying the hair treatment agent alone, or uniformly mixing the hair treatment agent with the aqueous base agent other than the first agent for straightening hair, the first agent for permanent wave, the first agent for heated permanent wave, the oxidative hair dye, and the decolorant (bleaching agent), and then applying the mixture.SELECTED DRAWING: None

Description

The present invention provides a hair treatment agent made of alkylene carbonate, a hair treatment agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent. A hair treatment method in which a hair treatment agent is applied as a pretreatment agent before applying the hair treatment agent to the hair, and a hair treatment agent is used as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, and an oxidation dye. A hair treatment method that uniformly mixes hair products and bleaching agents (bleaching agents) allows hair to be treated without reducing the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents). To suppress damage, or to use a hair treatment agent as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or an aqueous base other than a bleaching agent (bleaching agent). A hair treatment method in which a hair treatment agent is applied before being applied to the hair, and a hair treatment agent alone or together with a hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, and an oxidation dye. It repairs damaged hair by a hair treatment method in which it is uniformly mixed into an aqueous base other than a hair agent or bleaching agent and applied.

In general hair straightening, curls can be straightened by the action of a reducing agent and an oxidizing agent as main ingredients and mechanical treatment at high temperatures. Specifically, a first agent containing a reducing agent such as thioglycolic acid or its salt, cysteamine or its salt, and an alkaline agent such as aqueous ammonia, monoethanolamine, ammonium hydrogen carbonate, or arginine is applied to the hair. After reducing and cleaving the disulfide bonds present in keratin protein, the process is washed with water, dried with a hair dryer, etc., and stretched into a straight shape by mechanical treatment with an iron at approximately 180°C, and then treated with hydrogen peroxide or sodium bromate. The hair is treated with a second agent whose main ingredient is an oxidizing agent such as oxidizing agent, etc., to oxidize and re-form the disulfide groups, thereby fixing the hair in a straight shape.

General permanent waves can form curls due to the action of reducing agents and oxidizing agents, which are the main ingredients. Specifically, the first agent containing a reducing agent such as thioglycolic acid or a salt thereof, cysteamine or a salt thereof, and an alkaline agent such as aqueous ammonia, monoethanolamine, ammonium hydrogen carbonate, or arginine is used as hair wrapped around a rod. After reductively cleaving the disulfide bonds present in keratin proteins by applying the product to Reshape and fix hair into curls.

A typical heated permanent wave can form curls by the action of a reducing agent and an oxidizing agent as main ingredients and by treatment at high temperature. Specifically, a first agent containing a reducing agent such as thioglycolic acid or its salt, cysteamine or its salt, and an alkaline agent such as aqueous ammonia, monoethanolamine, ammonium hydrogen carbonate, or arginine is applied to the hair. After reductively cleaving the disulfide bonds present in keratin proteins, the process is washed with water, wrapped around a heating rod and heated at 60°C to 120°C to form a curl, and either before or after removing the heating rod, hydrogen peroxide or The hair is treated with a second agent mainly containing an oxidizing agent such as sodium bromate to oxidize and re-form the disulfide groups, thereby fixing the hair in a curled form. Alternatively, the hair is curled using a high-temperature hair styling iron instead of a heating rod, and then treated with a second agent containing an oxidizing agent such as hydrogen peroxide or sodium bromate to oxidize the disulfide groups. In some cases, the hair is reshaped and fixed into curls.

A typical oxidative hair dye is dyed by mixing a first part containing an oxidizing dye and an alkaline agent and a second part containing hydrogen peroxide immediately before use, and treating the mixture with the hair.

A general bleaching agent (bleaching agent) bleaches hair by mixing a first part containing a persulfate and an alkaline agent and a second part containing hydrogen peroxide immediately before use, and applying the mixture to the hair.

However, in all of hair straightening, permanent waving, and heated permanent waving, the alkaline first agent acts on the hair, causing the hair to swell and soften, causing damage to the hair. Also, in the case of oxidative hair dyeing and bleaching, the hair swells when exposed to alkaline conditions, causing damage to the hair. Hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, hair treatment agents and hair treatments that can suppress hair damage or repair damaged hair without reducing the functions of bleaching agents. A method is desired.

Generally, pre-treatment agents are applied before hair straightening, permanent waving, heated permanent waving, oxidative hair dyeing, and bleaching to prevent hair damage and prevent the progression of damage to damaged hair. It is known to do. However, the damage suppression effect is low, and if a pretreatment agent containing a high concentration of protective ingredients is used to improve the effect, the protection effect will be higher and the damage suppression effect can be exerted, but This was accompanied by a decline in the original functions of straightening, permanent waving, heated permanent waving, oxidative hair dyeing, and bleaching. In addition, various hair treatments are generally performed to repair damaged hair, but the repair effects are insufficient.

Patent Document 1 states that (A) an aromatic sulfonic acid or its salt having a molecular weight of 300 or less; (B) a cationic polymer having a cationic charge density of 4.5 meq/g or more); Disclosed are hair cosmetics in which the mass ratio (B)/(A) of B) is 0.7 or more and 5.0 or less, and a method for use as a hair bleaching or oxidative hair dye pretreatment agent. This suppresses the frizz and spreading of the hair that occurs after chemical treatments such as hair dyeing, further improves the cohesiveness and feel of the hair, and furthermore allows the effects to last for a certain period of time with a single treatment. However, there is no description regarding the effects of oxidative hair dyeing and bleaching.

Patent Document 2 discloses an acidic, one-component pretreatment agent containing one or more selected from citric acid, levulinic acid, and maleic acid, and an oxidative hair dyeing method using this pretreatment agent. and a decolorization method are disclosed. This is an acidic compound containing one or more selected from citric acid, levulinic acid, and maleic acid, so it is excellent in suppressing hair damage caused by oxidative hair dyeing or bleaching. There is no description regarding the effects of hair and bleaching.

JP2019-123710 JP2020-11905

The present invention was made in view of the drawbacks of the prior art, and provides a hair straightening agent, a permanent waving agent, a heated permanent waving agent, an oxidative hair dye, and a bleaching agent (bleaching agent) without reducing their functions. An object of the present invention is to provide a hair treatment agent and a hair treatment method capable of suppressing hair damage or repairing damaged hair. In addition, the functions of the hair straightening agent in this specification refer to straightening, straightening, and beautiful hair for curly hair, wavy hair, frizzy hair, curly hair due to aging, curly hair, and dryness and spread due to damage. It has a broad meaning that includes things like making things happen. Further, the functions of the permanent waving agent and the heating type permanent waving agent have a broad meaning including deforming hair such as curling and waving.

As a result of extensive research to solve the above problems, the present inventor has developed a hair treatment agent made of alkylene carbonate, a hair treatment agent for hair straightening, a first agent for permanent waving, and a heating type permanent hair treatment agent. A hair treatment method in which a first agent for waving, an oxidative hair dye, and a bleaching agent (bleaching agent) are applied as a pre-treatment agent before being applied to the hair, and a first agent for hair straightening and a hair treatment method for permanent waving. 1st agent, 1st agent for heated permanent waving, oxidative hair dye, hair straightening agent, permanent waving agent, heated permanent waving agent, oxidative hair dye by hair treatment method that uniformly mixes with oxidative hair dye, bleaching agent (bleaching agent) It is possible to suppress hair damage without reducing the function of the hair treatment agent, bleaching agent, or bleaching agent. 1 agent, a hair treatment method in which an aqueous base other than an oxidative hair dye or a bleaching agent (bleaching agent) is applied to the hair, and a hair treatment agent alone or together with a hair treatment agent and a first agent for hair straightening. , 1st part for permanent waving, 1st part for heated permanent waving, oxidative hair dye, bleaching agent (bleaching agent). The inventors have discovered that this can be realized, and have completed the present invention.

That is, the hair treatment agent of the present invention is propylene carbonate alone or a mixture of propylene carbonate and ethylene carbonate, and the mass ratio of propylene carbonate/ethylene carbonate is 100/0 to 10/90.

Levulinic acid may be added to the hair treatment agent of the present invention in order to impart smoothness.

Protein and/or dimaleic acid compound may be added to the hair treatment agent of the present invention in order to impart elasticity.

A polyhydric alcohol may be added to the hair treatment agent of the present invention in order to impart a moist feel.

A cationic substance dissolved in levulinic acid and/or polyhydric alcohol may be added to the hair treatment agent of the present invention in order to impart ease of fingering.

The hair treatment method of the present invention includes adding the hair treatment agent as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) to the hair. This is a method in which it is applied as a pre-treatment agent before being applied to the surface.

The hair treatment method of the present invention includes adding the hair treatment agent to a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or a bleaching agent (bleaching agent). This is a method of uniformly mixing 2 to 20% by mass and coating.

The hair treatment method of the present invention uses a hair treatment agent other than a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent). This method involves applying the aqueous base before applying it to the hair.

The hair treatment method of the present invention uses the hair treatment agent alone or together with a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent. This method involves uniformly mixing the bleaching agent into an aqueous base other than the bleaching agent.

The hair treatment agent and hair treatment method comprising alkylene carbonate of the present invention can prevent hair damage without reducing the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents. It is possible to control or repair damaged hair.

The hair treatment agent comprising the alkylene carbonate of the present invention, the hair treatment agent as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, a bleaching agent (bleaching agent) ) as a pre-treatment agent before applying it to the hair, and a hair treatment method in which the hair treatment agent is used as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, and oxidative hair dyeing. A hair treatment method that uniformly mixes hair straightening agents, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) without reducing hair damage. or use a water-based hair treatment agent other than the first agent for hair straightening, the first agent for permanent waves, the first agent for heated permanent waves, oxidative hair dyes, and bleaching agents (bleaching agents). A hair treatment method in which the hair treatment agent is applied before being applied to the hair, and a hair treatment agent used alone or together with a hair treatment agent and a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, and oxidative hair dyeing. It repairs damaged hair by a hair treatment method in which it is uniformly mixed into an aqueous base other than a bleaching agent or a bleaching agent and applied. Note that the heating type permanent wave includes curl formation using a heating rod, curl formation using a high-temperature hair styling iron, and the like. Furthermore, the hair straightening agent, permanent waving agent, or heating permanent waving agent has a broad meaning including straightening agents, curling agents, heating curling agents, etc. that are washable hair setting agents classified as cosmetics. The present invention will be explained in detail below.

The hair treatment agent of the present invention is propylene carbonate alone or a mixture of propylene carbonate and ethylene carbonate, and the mass ratio of propylene carbonate/ethylene carbonate is 100/0 to 10/90, preferably 70/30 to 30/70. It is. If the mass ratio of propylene carbonate/ethylene carbonate exceeds the mass ratio of ethylene carbonate by 10/90, it will crystallize at room temperature, resulting in a lack of convenience. Alkylene carbonate has a penetration promoting effect, making it possible to suppress hair damage without reducing the functionality of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents). . Alkylene carbonate also has the effect of repairing damaged hair.

Levulinic acid may be added to the hair treatment agent of the present invention. The hair treatment agent can be used as a pre-treatment agent before applying a hair treatment agent as a first agent for hair straightening, as a first agent for permanent waving, as a first agent for heated permanent waving, as an oxidative hair dye, or as a bleaching agent (bleaching agent). In the case of a hair treatment method involving application, the content of alkylene carbonate in the hair treatment agent is 30% by mass or more and the content of levulinic acid is 1% by mass or more. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. If the content of levulinic acid is less than 1% by mass, a sufficient smoothening effect cannot be obtained. In the case of a hair treatment method in which a hair treatment agent is uniformly mixed with a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent, the hair The content of alkylene carbonate in the treatment agent is 30% by mass or more, and the hair treatment agent, first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, bleaching agent ( The content of levulinic acid in the drug uniformly mixed with bleaching agent) is adjusted to 0.3 to 6% by mass. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. Levulinic acid content of a hair treatment agent, first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). If it is less than 0.3% by mass, a sufficient smoothing effect cannot be obtained, and if it is more than 6% by mass, hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents may be used. Decreases the function of (bleaching agent). Before applying a hair treatment agent to the hair, an aqueous base other than the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent) In the case of a hair treatment method in which the hair treatment agent is applied to hair, the content of alkylene carbonate in the hair treatment agent is 10% by mass or more, and the content of levulinic acid is 1% by mass or more. If the content of alkylene carbonate is less than 10% by mass, a sufficient repair effect cannot be obtained. If the content of levulinic acid is less than 1% by mass, a sufficient smoothening effect cannot be obtained. In the case of a hair treatment method in which a hair treatment agent is applied alone to repair damaged hair, the content of alkylene carbonate is 5% by mass or more, and the content of levulinic acid is 0.3% by mass or more. If the content of alkylene carbonate is less than 5% by mass, a sufficient repair effect cannot be obtained. If the content of levulinic acid is less than 0.3% by mass, a sufficient smoothening effect cannot be obtained. Further, a hair treatment agent is uniformly mixed into an aqueous base other than the first part for hair straightening, the first part for permanent waving, the first part for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). In the case of a hair treatment method that repairs damaged hair, a hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) are used. The alkylene carbonate content of the drug homogeneously mixed with aqueous bases other than ) is adjusted so that it is 2% by mass or more, and the levulinic acid content is 0.3% by mass or more. If the content of alkylene carbonate is less than 2% by mass, a sufficient repair effect cannot be obtained. If the content of levulinic acid is less than 0.3% by mass, a sufficient smoothening effect cannot be obtained.

Protein and/or dimaleic acid compounds may be added to the hair treatment agent of the present invention. The hair treatment agent can be used as a pre-treatment agent before applying a hair treatment agent as a first agent for hair straightening, as a first agent for permanent waving, as a first agent for heated permanent waving, as an oxidative hair dye, or as a bleaching agent (bleaching agent). In the case of a hair treatment method using coating, the content of alkylene carbonate in the hair treatment agent is 30% by mass or more, and the content of protein and/or dimaleic acid compound is 0.5% by mass or more. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. If the content of protein and/or dimaleic acid compound is less than 0.5% by mass, a sufficient elasticity imparting effect cannot be obtained. In the case of a hair treatment method in which a hair treatment agent is uniformly mixed with a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent, the hair The content of alkylene carbonate in the treatment agent is 30% by mass or more, and the hair treatment agent, first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, bleaching agent ( The content of protein and/or dimaleic acid compound in the drug uniformly mixed with bleaching agent) is adjusted to 0.1 to 4.5% by mass. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. The content of the hair treatment agent, the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) is uniformly mixed. If it is less than 1% by mass, a sufficient elasticity imparting effect cannot be obtained, and even if it exceeds 4.5% by mass, an improvement in the elasticity imparting effect commensurate with the content cannot be expected. Before applying a hair treatment agent to the hair, an aqueous base other than the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent) In the case of a hair treatment method in which the hair treatment agent is applied to hair, the content of alkylene carbonate in the hair treatment agent is 10% by mass or more, and the content of protein and/or dimaleic acid compound is 0.5% by mass or more. If the content of alkylene carbonate is less than 10% by mass, a sufficient repair effect cannot be obtained. If the content of protein and/or dimaleic acid compound is less than 0.5% by mass, a sufficient elasticity imparting effect cannot be obtained. In the case of a hair treatment method in which a hair treatment agent is applied alone to repair damaged hair, the content of alkylene carbonate is 5% by mass or more, and the content of protein and/or dimaleic acid compound is 0.1% by mass or more. It is. If the content of alkylene carbonate is less than 5% by mass, a sufficient repair effect cannot be obtained. If the content of protein and/or dimaleic acid compound is less than 0.1% by mass, a sufficient elasticity imparting effect cannot be obtained. Further, a hair treatment agent is uniformly mixed into an aqueous base other than the first part for hair straightening, the first part for permanent waving, the first part for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). In the case of a hair treatment method that repairs damaged hair, a hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) are used. The alkylene carbonate content of the drug homogeneously mixed with an aqueous base other than ) is adjusted so that it is 2% by mass or more, and the content of protein and/or dimaleic acid compound is 0.1% by mass or more. If the content of alkylene carbonate is less than 2% by mass, a sufficient repair effect cannot be obtained. If the content of protein and/or dimaleic acid compound is less than 0.1% by mass, a sufficient elasticity imparting effect cannot be obtained.
Examples of proteins include hydrolyzed keratin, hydrolyzed collagen, hydrolyzed silk, carboxymethyl cysteine lysine, and the like. Examples of dimaleic acid compounds include cystamine dimaleate, propylene diammonium dimaleate, and isophorone diamine sesquimaleate. Since these protein and/or dimaleic acid compounds are not compatible with alkylene carbonate, they are dissolved in levulinic acid and then uniformly mixed with alkylene carbonate. However, alkylene carbonate gradually becomes less effective as it decomposes with water. For the sake of shelf life as a product, it is preferable to prepare the product so that it contains 5% by mass or less of water, and it is more preferable to prepare it so that it does not contain water. Therefore, the protein and/or dimaleic acid compound is preferably a powder that does not substantially contain water.

A polyhydric alcohol may be added to the hair treatment agent of the present invention. The hair treatment agent can be used as a pre-treatment agent before applying a hair treatment agent as a first agent for hair straightening, as a first agent for permanent waving, as a first agent for heated permanent waving, as an oxidative hair dye, or as a bleaching agent (bleaching agent). In the case of a hair treatment method involving application, the content of alkylene carbonate in the hair treatment agent is 30% by mass or more and the content of polyhydric alcohol is 1% by mass or more. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. If the content of polyhydric alcohol is less than 1% by mass, a sufficient moist feeling imparting effect cannot be obtained. In the case of a hair treatment method in which a hair treatment agent is uniformly mixed with a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent, the hair The content of alkylene carbonate in the treatment agent is 30% by mass or more, and the hair treatment agent, first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, bleaching agent ( The content of polyhydric alcohol in the chemical uniformly mixed with the bleaching agent) is adjusted to 0.3 to 10% by mass. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. Contains polyhydric alcohol in a hair treatment agent, hair straightening agent 1st agent, permanent wave 1st agent, heated permanent wave 1st agent, oxidative hair dye, and bleaching agent (bleaching agent). If the amount is less than 0.3% by mass, a sufficient moist feeling imparting effect cannot be obtained, and even if it exceeds 10 mass%, an improvement in the moist feeling imparting effect commensurate with the content cannot be expected. Before applying a hair treatment agent to the hair, an aqueous base other than the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent) In the case of a hair treatment method characterized in that the hair treatment agent is applied to the skin, the content of alkylene carbonate in the hair treatment agent is 10% by mass or more, and the content of polyhydric alcohol is 1% by mass or more. If the content of alkylene carbonate is less than 10% by mass, a sufficient repair effect cannot be obtained. If the content of polyhydric alcohol is less than 1% by mass, a sufficient moist feeling imparting effect cannot be obtained. In the case of a hair treatment method in which a hair treatment agent is applied alone to repair damaged hair, the content of alkylene carbonate is 5% by mass or more and the content of polyhydric alcohol is 0.3% by mass or more. If the content of alkylene carbonate is less than 5% by mass, a sufficient repair effect cannot be obtained. If the content of polyhydric alcohol is less than 0.3% by mass, a sufficient moist feeling imparting effect cannot be obtained. Further, a hair treatment agent is uniformly mixed into an aqueous base other than the first part for hair straightening, the first part for permanent waving, the first part for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). In the case of a hair treatment method that repairs damaged hair, a hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) are used. The alkylene carbonate content of the drug homogeneously mixed with aqueous bases other than ) is adjusted to be 2% by mass or more, and the polyhydric alcohol content is adjusted to 0.3% by mass or more. If the content of alkylene carbonate is less than 2% by mass, a sufficient repair effect cannot be obtained. If the content of polyhydric alcohol is less than 0.3% by mass, a sufficient moist feeling imparting effect cannot be obtained.
Examples of polyhydric alcohols include glycerin, diglycerin, triglycerin, propylene glycol, dipropylene glycol, tripropylene glycol, 1,3-butylene glycol, 3-methyl-1,3-butanediol, ethylene glycol, polyethylene glycol, and polypropylene. Examples include glycol and the like.

A cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol may be added to the hair treatment agent of the present invention. The hair treatment agent can be used as a pre-treatment agent before applying a hair treatment agent as a first agent for hair straightening, as a first agent for permanent waving, as a first agent for heated permanent waving, as an oxidative hair dye, or as a bleaching agent (bleaching agent). In the case of a hair treatment method in which the hair treatment agent is coated, the content of alkylene carbonate in the hair treatment agent is 30% by mass or more, and the content of a cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is 0.5% by mass or more. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. If the content of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is less than 0.5% by mass, it is not possible to obtain a sufficient effect of imparting ease of fingering. In the case of a hair treatment method in which a hair treatment agent is uniformly mixed with a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent, the hair The content of alkylene carbonate in the treatment agent is 30% by mass or more, and the hair treatment agent, first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, bleaching agent ( The content of cationic substances that can be dissolved in levulinic acid and/or polyhydric alcohol in the uniformly mixed bleaching agent) is adjusted to 0.1 to 4.5% by mass. If the content of alkylene carbonate is less than 30% by mass, the functions of hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents) will not be reduced and hair damage will be suppressed. can't get any effect. Levulinic acid and/or a hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent). If the content of the cationic substance that can be dissolved in polyhydric alcohol is less than 0.1% by mass, it will not be possible to obtain a sufficient effect of imparting smooth fingering, and even if it exceeds 4.5% by mass, the content will not be adequate. No improvement in the effect of imparting streetability can be expected. Before applying a hair treatment agent to the hair, an aqueous base other than the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent) In the case of a hair treatment method in which the hair treatment agent is applied to hair, the content of alkylene carbonate in the hair treatment agent is 10% by mass or more, and the content of a cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is 0.5% by mass or more. . If the content of alkylene carbonate is less than 10% by mass, a sufficient repair effect cannot be obtained. If the content of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is less than 0.5% by mass, it is not possible to obtain a sufficient effect of imparting ease of fingering. In the case of a hair treatment method in which a hair treatment agent is applied alone to repair damaged hair, the content of alkylene carbonate is 5% by mass or more and the content of cationic substances that can be dissolved in levulinic acid and/or polyhydric alcohol is It is 0.1% by mass or more. If the content of alkylene carbonate is less than 5% by mass, a sufficient repair effect cannot be obtained. If the content of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is less than 0.1% by mass, a sufficient effect of imparting smoothness to the fingers cannot be obtained. Further, a hair treatment agent is uniformly mixed into an aqueous base other than the first part for hair straightening, the first part for permanent waving, the first part for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). In the case of a hair treatment method that repairs damaged hair, a hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) are used. The content of alkylene carbonate in the drug uniformly mixed with an aqueous base other than ) is 2% by mass or more, and the content of cationic substances that can be dissolved in levulinic acid and/or polyhydric alcohol is 0.1% by mass or more. Adjust accordingly. If the content of alkylene carbonate is less than 2% by mass, a sufficient repair effect cannot be obtained. If the content of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is less than 0.1% by mass, it is not possible to obtain a sufficient effect of imparting ease of fingering.
Examples of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol include cationic surfactants, ethyl sulfate lanolin fatty acid aminopropylethyl dimethyl ammonium, and the like. Since these cationic substances are not compatible with alkylene carbonate, they are dissolved in levulinic acid and/or polyhydric alcohol, and then uniformly mixed with alkylene carbonate. However, alkylene carbonate gradually becomes less effective as it decomposes with water. For the sake of shelf life as a product, it is preferable to prepare the product so that it contains 5% by mass or less of water, and it is more preferable to prepare it so that it does not contain water. Therefore, the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol is preferably a water-free powder, a polyhydric alcohol solution, or a lower alcohol solution.

The hair treatment agent includes alkylene carbonate, levulinic acid, protein, dimaleic acid compound, polyhydric alcohol, levulinic acid and/or a cationic substance that can be dissolved in polyhydric alcohol, as well as polybasic acid ester, nonionic surfactant. Agents, alkyl benzoates (C12-15), organic solvents, etc. can be optionally added within a range that does not impair the effects of the present invention. As a component, a liquid substance is preferable. Furthermore, alkylene carbonate gradually becomes less effective as it decomposes with water. In order to preserve the product's shelf life, it is preferable to prepare the product so that the water content is 5% by mass or less, and it is more preferable to prepare the product so that it does not contain water.

Specifically, the polybasic acid esters include di(caprylic/capric acid) propylene glycol, tri(caprylic/capric acid) glyceryl, glyceryl tri2-ethylhexanoate, triethyl citrate, acetyltributyl citrate, and tetra Examples include pentaerythritol 2-ethylhexanoate, di2-ethylhexyl succinate, diethyl sebacate, and the like.

Specifically, the nonionic surfactants include POE alkyl ether, POP alkyl ether, POE/POP alkyl ether, POE/POP glycol, POE sorbitan fatty acid ester, POE castor oil, POE hydrogenated castor oil, POE sorbitol tetra. Examples include fatty acid ester, alkyl polyglucoside, N-alkyldimethylamine oxide, POP glyceryl ether, POP sorbitol, POE/POP glyceryl ether, and the like.

Examples of the organic solvent include lower alcohols, aromatic alcohols, N-alkylpyrrolidone, and the like.

The hair treatment method of the present invention suppresses hair damage without reducing the functions of hair straighteners, permanent waving agents, heating permanent waving agents, oxidative hair dyes, and bleaching agents. First agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent) are applied as a pretreatment agent before being applied to the hair, and then layered. The first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, the oxidative hair dye, and the bleaching agent (bleaching agent) are applied, and then the first agent for hair straightening is applied in layers. The treatment is performed using the following methods: 1st agent for permanent waving, 1st agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). When the hair treatment agent is used as it is or is diluted, the content of alkylene carbonate is 30% by mass or more, the content of levulinic acid is 1% by mass or more, or the content of levulinic acid is 1% by mass or more, and protein and /or the content of dimaleic acid compound is 0.5% by mass or more, and/or the content of polyhydric alcohol is 1% by mass or more, and/or the content of levulinic acid is 1% by mass or more and/or the polyhydric alcohol is It may be diluted with water or hot water so that the content of the cationic substance that is 1% by mass or more and can be dissolved in levulinic acid and/or polyhydric alcohol is 0.5% by mass or more. When diluting with water or hot water, mix uniformly before use to prepare for use, but preferably immediately before use. After applying the hair treatment agent, it may or may not be left to stand for some time.

Furthermore, the hair treatment method of the present invention suppresses hair damage without reducing the functions of hair straighteners, permanent waving agents, heating permanent waving agents, oxidative hair dyes, and bleaching agents (bleaching agents). 2 to 20% by mass, preferably 5 to 15% by mass of the first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). Apply the uniformly mixed chemicals in mass%, and then apply the uniformly mixed first agent for hair straightening, first agent for permanent waving, first agent for heated permanent waving, oxidative hair dye, bleaching agent (bleaching agent) The treatment is performed according to the usage. If it is less than 2% by mass, a sufficient effect of suppressing hair damage cannot be obtained, whereas if it is more than 20% by mass, hair straighteners, permanent waving agents, heated permanent waving agents, oxidative hair dyes, Decreases the function of bleaching agents (bleaching agents). Uniform mixing of the hair treatment agent and the first part for hair straightening, the first part for permanent waving, the first part for heated permanent waving, the oxidative hair dye, or the bleaching agent (bleaching agent) can be used for hair straightening, The ingredients are mixed uniformly before use for permanent waving, heated permanent waving, oxidative hair dyeing, and bleaching (bleaching), but preferably immediately before use.

The first agent for hair straightening, the first agent for permanent waves, the first agent for heated permanent waves, the oxidative hair dye, and the bleaching agent (bleaching agent) include the first agent for hair straightening, the first agent for permanent waves. 1 agent, first agent for heating permanent waving, straightening agent, curling agent, heating curling agent, oxidative hair dye, bleaching agent (bleaching agent), etc., known first agent for hair straightening, permanent waving agent, etc. The first agent for waving, the first agent for heated permanent waving, a straightening agent, a curling agent, a heating curling agent, an oxidative hair dye, a bleaching agent (bleaching agent), etc. themselves may be used.

The hair treatment method of the present invention for repairing damaged hair includes the hair treatment agent as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent. (A bleaching agent) is applied before applying the aqueous base to the hair, and then the aqueous base is applied again. Thereafter, the treatment is performed using the above-mentioned method of applying the aqueous base. After applying the hair treatment agent, it may or may not be left to stand for some time. Furthermore, after the treatment using the above-mentioned aqueous base applied in layers, in order to improve the smoothness of curly hair (stretch out curly hair), after drying and/or while drying, the surface temperature is set at 120 to 230°C. The hair may be straightened using a hair styling or hair straightening iron, preferably at 180 to 210° C., while applying mechanical force and heat to the hair.

Further, the hair treatment method of the present invention for repairing damaged hair includes using the hair treatment agent alone or in combination with the hair treatment agent, a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving. The aqueous base other than the dye, oxidative hair dye, and bleaching agent (bleaching agent) are mixed uniformly and applied to the hair. When the hair treatment agent is used alone, it may be used as it is or diluted with water or hot water, and may be applied, left to stand, and then washed off, or may not be washed off. When diluting with water or hot water, mix uniformly before use to prepare for use, but preferably immediately before use. Further, the hair treatment agent and an aqueous base other than a first part for hair straightening, a first part for permanent waving, a first part for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent) are uniformly mixed. When doing so, the hair treatment agent may be used in an aqueous base other than the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, oxidative hair dye, and bleaching agent (bleaching agent). Mix in any ratio. Uniform mixing of the hair treatment agent and an aqueous base other than the first part for hair straightening, the first part for permanent waving, the first part for heated permanent waving, the oxidative hair dye, and the bleaching agent (bleaching agent) is performed by: It is prepared before use by uniformly mixing it before the treatment, but it is preferable to do it immediately before the treatment. The hair treatment agent may be used alone or together with a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or an aqueous agent other than a bleaching agent (bleaching agent). After the base is mixed uniformly and after the treatment, in order to improve the smoothness of curly hair (stretch out the curls), after drying and/or while drying, the surface temperature is 120 to 230 °C, preferably 180 to 210 °C. The hair may be straightened using a hair straightening iron while applying mechanical force and heat to the hair.

Aqueous bases other than the first agent for hair straightening, the first agent for permanent waves, the first agent for heated permanent waves, oxidative hair dyes, and bleaching agents (bleaching agents) include the second agent for hair straightening. , a second agent for permanent waves, a second agent for heated permanent waves, hair treatments, hair conditioners, hair rinses, etc., and known second agents for hair straightening, second agents for permanent waves, heated permanent waves, etc. It may be used as a second agent, hair treatment, hair conditioner, hair rinse, etc.

The form of the hair treatment agent of the present invention may be liquid, viscous liquid, gel, or the like.

The present invention will be explained in more detail by giving specific examples below, but the present invention is not limited to the following examples. In addition, the blending amounts in the following Examples and the like are expressed in mass % unless otherwise specified.

(Examples 1 to 7)
A hair treatment agent having the composition listed in Table 1 below was prepared by stirring and mixing until each component became uniform.
Apply 1 g of the prepared hair treatment agent as a pretreatment agent before performing the following hair straightening treatment, the following permanent wave treatment, the following heated permanent wave treatment, the following oxidative hair dyeing treatment, and the following bleaching treatment, and apply thoroughly. Blend it with a comb, then apply hair straightening agent 1, permanent waving agent 1, heated permanent wave agent 1, oxidizing hair dye, and bleaching agent (bleaching agent) in layers. The treatment effect and damage suppression effect were evaluated by the following method. The damage suppression effect was judged from the cohesive effect and gloss effect.

<Creation of test hair bundles for evaluation in hair straightening treatment>
Natural curly hair (Indian black hair) was trimmed to a length of 30 cm when stretched to create a hair bundle weighing 3 g. Then, the hair was washed twice with a commercially available shampoo and thoroughly towel-dried to obtain a test hair bundle.
<Creation of test hair bundles for evaluation in permanent wave treatment, heated permanent wave treatment, hair dye treatment, and bleaching treatment>
Human hair (Chinese) was cut to a length of 30 cm to create a hair bundle weighing 3 g. Then, the hair was washed twice with a commercially available shampoo and thoroughly towel-dried to obtain a test hair bundle.

<Hair straightening treatment>
8 g of a commercially available first agent for hair straightening is applied to the test hair bundle and left for 20 minutes. Then, wash off the first hair straightening agent thoroughly with hot water. The hair was thoroughly towel-dried, dried with a hair dryer, and then straightened using a hair straightening iron heated to 180° C. for 10 seconds. Next, 10 g of a commercially available second agent for hair straightening (hydrogen peroxide) is applied, left to stand at room temperature for 5 minutes, and the second agent for hair straightening is thoroughly washed away with hot water. After that, wash the hair twice with a commercially available shampoo, towel dry it thoroughly, style it with a comb, fix one end of the hair bundle, hang it vertically, leave it at room temperature for 24 hours, and dry it thoroughly. Three people with over 10 years of experience as beauticians made the evaluation based on the following evaluation criteria.

<Hair straightening treatment effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. The habit does not grow well.
2. The growth of the habit is a little slow.
3. The growth of the habit is the same.
4. The texture is slightly elongated.
5. The habit grows well.
<Hair straightening treatment cohesion effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. It's a little disorganized.
2. The cohesion is the same.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Hair straightening treatment gloss effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. The gloss is a little poor.
2. The gloss is the same.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

<Permanent wave treatment>
A test hair bundle is wound around a rod with a diameter of about 20 mm, 5 g of a commercially available first agent for permanent waves is applied, and the rod is left for 15 minutes. Then, wash off the first permanent wave agent thoroughly with hot water. Next, 5 g of a commercially available second agent for permanent waving (sodium bromate) is applied and left at room temperature for 15 minutes. Furthermore, the test hair bundle was removed from the rod and the second agent was thoroughly washed away with hot water. After that, wash the hair twice with a commercially available shampoo, towel dry it thoroughly, style it with a comb, fix one end of the hair bundle, hang it vertically, leave it at room temperature for 24 hours, and dry it thoroughly. Three people with over 10 years of experience as beauticians made the evaluation based on the following evaluation criteria.

<Permanent wave treatment effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. Curls are weak.
2. The curls are a little weak.
3. Karl is equal.
4. The curls are a little strong.
5. Strong curls.
<Permanent wave treatment cohesive effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. It's a little disorganized.
2. The cohesion is the same.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Permanent wave treatment gloss effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. The gloss is a little poor.
2. The gloss is the same.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

<Heating permanent wave treatment>
8 g of a commercially available first agent for heating permanent waving is applied to the test hair bundle and left for 15 minutes. Then, thoroughly wash off the first agent for heated permanent waves with hot water. Next, it is towel-dried, wrapped around a heating rod with a diameter of about 20 mm, and heated and dried at 80°C. Next, 10 g of a commercially available second agent (sodium bromate) is applied and left at room temperature for 15 minutes. Furthermore, the test hair bundle was removed from the heating rod, and the second agent was thoroughly washed away with hot water. After that, wash the hair twice with a commercially available shampoo, towel dry it thoroughly, style it with a comb, fix one end of the hair bundle, hang it vertically, leave it at room temperature for 24 hours, and dry it thoroughly. Three people with over 10 years of experience as beauticians made the evaluation based on the following evaluation criteria.

<Heating permanent wave treatment effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. Curls are weak.
2. The curls are a little weak.
3. Karl is equal.
4. The curls are a little strong.
5. Strong curls.
<Heating permanent wave treatment cohesion effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. It's a little disorganized.
2. The cohesion is the same.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Heating permanent wave treatment gloss effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. The gloss is a little poor.
2. The gloss is the same.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

<Oxidative hair dyeing treatment>
A commercially available 10 level (ash type) hair dye and two agents (6% hydrogen peroxide) are mixed on a test hair bundle according to the instructions, 8 g of the mixed oxidative hair dye is applied, and the mixture is left for 30 minutes. Then, wash off the drug thoroughly with hot water. After that, wash the hair twice with a commercially available shampoo, towel dry it thoroughly, style it with a comb, fix one end of the hair bundle, hang it vertically, leave it at room temperature for 24 hours, and dry it thoroughly. Three people with over 10 years of experience as beauticians made the evaluation based on the following evaluation criteria.

<Oxidative hair dye treatment effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. Hair dye is weak.
2. The dyed hair is a little weak.
3. The dyed hair is the same.
4. The dyed hair is a little strong.
5. Strong hair dye.
<Evaluation criteria for the cohesive effect of oxidative hair dyeing treatment>
Comparison with when no hair treatment agent was used 1. It's a little disorganized.
2. The cohesion is the same.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Oxidative hair dye treatment gloss effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. The gloss is a little poor.
2. The gloss is the same.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

<Bleach treatment>
A commercially available powder type bleaching agent and two agents (6% hydrogen peroxide) are mixed on the test hair bundle according to the instructions, and 8 g of the mixed bleaching agent (bleaching agent) is applied and left for 40 minutes. Then, wash off the drug thoroughly with hot water. After that, wash the hair twice with a commercially available shampoo, towel dry it thoroughly, style it with a comb, fix one end of the hair bundle, hang it vertically, leave it at room temperature for 24 hours, and dry it thoroughly. Three people with over 10 years of experience as beauticians made the evaluation based on the following evaluation criteria.

<Bleach treatment effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. Decolorization is weak.
2. Decolorization is a little weak.
3. Equivalent bleaching.
4. Slightly strong bleaching.
5. Strong bleaching.
<Evaluation criteria for the cohesive effect of bleaching treatment>
Comparison with when no hair treatment agent was used 1. It's a little disorganized.
2. The cohesion is the same.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Bleach treatment gloss effect evaluation criteria>
Comparison with when no hair treatment agent was used 1. The gloss is a little poor.
2. The gloss is the same.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

As shown in Examples 1 to 7, when the mass ratio of propylene carbonate/ethylene carbonate is 100/0 to 10/90, sufficient treatment effects and hair damage suppression effects (clumping effect, gloss effect) can be obtained. Ta.

(Examples 8 to 14 and Comparative Examples 1 to 2)
A hair treatment agent having the composition listed in Table 2 below was prepared by stirring and mixing until each component became uniform.
Apply 1 g of the prepared hair treatment agent as a pretreatment agent before performing the hair straightening treatment, the permanent wave treatment, the heated permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Blend it with a comb, then apply hair straightening agent 1, permanent waving agent 1, heated permanent wave agent 1, oxidizing hair dye, and bleaching agent (bleaching agent) in layers. The treatment effect, damage suppression effect, and smoothness imparting effect when levulinic acid was included were evaluated using the methods described above. The evaluation criteria for the smoothing effect when levulinic acid is contained are as follows.

<Evaluation criteria for smoothing effect>
The smoothing effect was evaluated in comparison with Examples 2 and 4 to 7 in which the mass ratio of propylene carbonate/ethylene carbonate was 50/50.
1. There is no improvement in smoothness.
2. There is only a small improvement in smoothness.
3. There is a slight improvement in smoothness.
4. There is an improvement in smoothness.
5. There is a huge improvement in smoothness.

As shown in Examples 8 to 14, when the content of alkylene carbonate is 30% by mass or more and the content of levulinic acid is 1% by mass or more, sufficient treatment effects and hair damage suppression effects (clumping effect, shine effect) was obtained, and a sufficient smoothing effect was obtained. On the other hand, as shown in Comparative Examples 1 and 2, when the content of alkylene carbonate or levulinic acid is outside the above range, the treatment effect and hair damage suppressing effect (clumping effect, gloss effect) are insufficient, Or the smoothing effect was insufficient.

(Examples 15-21, Comparative Examples 3-4)
A hair treatment agent having the composition listed in Table 3 below was prepared by stirring and mixing until each component became uniform.
Apply 1 g of the prepared hair treatment agent as a pretreatment agent before performing the hair straightening treatment, the permanent wave treatment, the heated permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Blend it with a comb, then apply hair straightening agent 1, permanent waving agent 1, heated permanent wave agent 1, oxidizing hair dye, and bleaching agent (bleaching agent) in layers. The treatment effect, damage suppression effect, and elasticity imparting effect when containing protein and/or dimaleic acid compound were evaluated by the methods described above. The evaluation criteria for the elasticity imparting effect when containing protein and/or dimaleic acid compound are as follows.

<Elasticity imparting effect evaluation criteria>
The elasticity imparting effect is evaluated in comparison with Examples 2 and 4 to 7 in which the mass ratio of propylene carbonate/ethylene carbonate is 50/50.
1. There is no improvement in elasticity.
2. There is only a slight improvement in elasticity.
3. There is a slight improvement in elasticity.
4. There is an improvement in elasticity.
5. There is a significant improvement in elasticity.

As shown in Examples 15 to 21, the content of alkylene carbonate is 30% by mass or more, the content of levulinic acid is 1% by mass or more, and the content of protein and/or dimaleic acid compound is 0.5% by mass. In the above cases, sufficient treatment effects and hair damage suppressing effects (clumping effect, gloss effect) were obtained, as well as sufficient smoothness imparting effects and sufficient elasticity imparting effects. On the other hand, as shown in Comparative Examples 3 and 4, when the content of alkylene carbonate or protein and/or dimaleic acid compound is outside the above range, the treatment effect and hair damage suppression effect (clumping effect, gloss effect) ) was insufficient, or the elasticity imparting effect was insufficient.

(Examples 22-28 and Comparative Examples 5-6)
A hair treatment agent having the composition listed in Table 4 below was prepared by stirring and mixing until each component became uniform.
Apply 1 g of the prepared hair treatment agent as a pretreatment agent before performing the hair straightening treatment, the permanent wave treatment, the heated permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Blend it with a comb, then apply hair straightening agent 1, permanent waving agent 1, heated permanent wave agent 1, oxidizing hair dye, and bleaching agent (bleaching agent) in layers. The treatment effect, damage prevention effect, and moist feeling imparting effect when polyhydric alcohol was contained were evaluated by the methods described above. The evaluation criteria for the moist feeling imparting effect when polyhydric alcohol is contained are as follows.

<Evaluation criteria for moisturizing effect>
The moist feeling imparting effect is evaluated in comparison with Examples 2 and 4 to 7 in which the mass ratio of propylene carbonate/ethylene carbonate is 50/50.
1. There is no improvement in the moist feeling.
2. There is only a slight improvement in the moist feeling.
3. There is a slight improvement in the moist feeling.
4. There is an improvement in the moist feeling.
5. There is a significant improvement in the moist feeling.

As shown in Examples 22 to 28, when the content of alkylene carbonate is 30% by mass or more and the content of polyhydric alcohol is 1% by mass or more, further, the content of levulinic acid is 1% by mass or more, Alternatively, if the content of levulinic acid is 1% by mass or more and the content of protein and/or dimaleic acid compound is 0.5% by mass or more, sufficient treatment effect and hair damage suppression effect (clumping effect, gloss effect) can be obtained. In addition, a sufficient moist feeling imparting effect was obtained, and a sufficient smooth imparting effect was obtained, or a sufficient smooth imparting effect was obtained and a sufficient elasticity imparting effect was obtained. On the other hand, as shown in Comparative Examples 5 and 6, when the content of alkylene carbonate or polyhydric alcohol is outside the above range, the treatment effect and hair damage suppressing effect (clumping effect, gloss effect) are insufficient. , or the moist feeling imparting effect was insufficient.

(Examples 29-36, Comparative Examples 7-8)
A hair treatment agent having the composition listed in Table 5 below was prepared by stirring and mixing until each component became uniform.
Apply 1 g of the prepared hair treatment agent as a pretreatment agent before performing the hair straightening treatment, the permanent wave treatment, the heated permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Blend it with a comb, then apply hair straightening agent 1, permanent waving agent 1, heated permanent wave agent 1, oxidizing hair dye, and bleaching agent (bleaching agent) in layers. The treatment effect, the damage prevention effect, and the effect of imparting ease of finger passage when containing a cationic substance that can be dissolved in levulinic acid and/or a polyhydric alcohol were evaluated using the methods described above. The evaluation criteria for the effect of imparting ease of finger passage in the case of containing a cationic substance that can be dissolved in levulinic acid and/or a polyhydric alcohol are as follows.

<Evaluation criteria for improving finger smoothness>
The effect of imparting ease of finger passage is evaluated in comparison with Examples 2 and 4 to 7 in which the mass ratio of propylene carbonate/ethylene carbonate is 50/50.
1. There is no improvement in the ease of fingering.
2. There is only a slight improvement in the ease of fingering.
3. There is a slight improvement in the ease of fingering.
4. There is an improvement in the ease of fingering.
5. The ease of fingering has been greatly improved.

As shown in Examples 29 to 36, the content of alkylene carbonate is 30% by mass or more, and the content of levulinic acid is 1% by mass or more and/or the polyhydric alcohol is 1% by mass or more, and levulinic acid and/or If the content of cationic substances that can be dissolved in polyhydric alcohol is 0.5% by mass or more, the content of levulinic acid is 1% by mass or more, or if the content of levulinic acid is 1% by mass or more and protein and /or When the content of dimaleic acid compound is 0.5% by mass or more and/or the content of polyhydric alcohol is 1% by mass or more, sufficient treatment effect and hair damage suppression effect (clumping effect, gloss effect) is obtained, and a sufficient smoothing effect and/or a moist feeling imparting effect is obtained, and a sufficient smoothing effect is obtained, and a sufficient smoothing effect is obtained, or a sufficient smoothing effect is obtained. A sufficient elasticity-imparting effect was obtained, and/or a moist feeling-imparting effect was obtained. On the other hand, as shown in Comparative Examples 7 and 8, when the content of the cationic substance that can be dissolved in alkylene carbonate, levulinic acid, and/or polyhydric alcohol is outside the above range, the treatment effect and hair damage control are reduced. The effect (cohesive effect, gloss effect) was insufficient, or the effect of imparting smoothness to the fingers was insufficient.

(Examples 37-45, Comparative Examples 9-10)
A hair treatment agent having the composition listed in Table 6 below was prepared by stirring and mixing until each component became uniform.
A uniform mixture of the prepared hair treatment agent, hair straightening first agent, permanent wave first agent, heated permanent wave first agent, oxidative hair dye, and bleaching agent (bleaching agent) was applied to the hair straightening treatment. , hair straightening agent 1, permanent wave agent 1, heated permanent wave agent 1, oxidation dyeing of the permanent wave treatment, the heating permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Used as a hair conditioner and bleaching agent. The treatment effect and damage suppression effect were evaluated by the method described above.

As shown in Examples 37 to 45, the mass ratio of propylene carbonate/ethylene carbonate is 100/0 to 10/90, and the first agent for hair straightening, the first agent for permanent waving, and the first agent for heated permanent waving. When 2 to 20% by mass of the hair dye, oxidized hair dye, and bleaching agent were uniformly mixed, sufficient treatment effects and hair damage suppression effects (clumping effect, shine effect) were obtained. On the other hand, as shown in Comparative Examples 9 and 10, the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, oxidative hair dye, bleaching agent (bleaching agent) When the mixing amount was outside the above range, the treatment effect or hair damage suppressing effect (clumping effect, gloss effect) was insufficient.

(Examples 46-52, Comparative Examples 11-13)
A hair treatment agent having the composition listed in Table 7 below was prepared by stirring and mixing until each component became uniform.
A uniform mixture of the prepared hair treatment agent, hair straightening first agent, permanent wave first agent, heated permanent wave first agent, oxidative hair dye, and bleaching agent (bleaching agent) was applied to the hair straightening treatment. , hair straightening agent 1, permanent wave agent 1, heated permanent wave agent 1, oxidation dyeing of the permanent wave treatment, the heating permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Used as a hair conditioner and bleaching agent. The treatment effect, damage suppression effect, and smoothing effect when levulinic acid was included were evaluated using the methods described above. The evaluation criteria for the smoothing effect when levulinic acid is contained are as follows.

<Evaluation criteria for smoothing effect>
The smoothing effect was evaluated in comparison with Examples 38 and 42 to 45 in which the mass ratio of propylene carbonate/ethylene carbonate was 50/50.
1. There is no improvement in smoothness.
2. There is only a small improvement in smoothness.
3. There is a slight improvement in smoothness.
4. There is an improvement in smoothness.
5. There is a huge improvement in smoothness.

As shown in Examples 46 to 52, the content of alkylene carbonate is 30% by mass or more, and the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, and the oxidative hair dye. When the content of levulinic acid in the drug uniformly mixed with bleaching agent and decolorizing agent (bleaching agent) is 0.3 to 6% by mass, sufficient treatment effects and hair damage suppressing effects (clumping effect, gloss effect) can be obtained, Moreover, a sufficient smoothing effect was obtained. On the other hand, as shown in Comparative Examples 11 to 13, alkylene carbonate, or a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or a bleaching agent. If the content of levulinic acid in the drug uniformly mixed with (bleaching agent) is outside the above range, the treatment effect and hair damage prevention effect (clumping effect, gloss effect) or smoothing effect may be insufficient. Ta.

(Examples 53-59, Comparative Examples 14-15)
A hair treatment agent having the composition listed in Table 8 below was prepared by stirring and mixing until each component became uniform.
A uniform mixture of the prepared hair treatment agent, hair straightening first agent, permanent wave first agent, heated permanent wave first agent, oxidative hair dye, and bleaching agent (bleaching agent) was applied to the hair straightening treatment. , hair straightening agent 1, permanent wave agent 1, heated permanent wave agent 1, oxidation dyeing of the permanent wave treatment, the heating permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Used as a hair conditioner and bleaching agent. The treatment effect, damage suppression effect, and elasticity imparting effect when containing protein and/or dimaleic acid compound were evaluated by the methods described above. The evaluation criteria for the elasticity imparting effect when containing protein and/or dimaleic acid compound are as follows.

<Elasticity imparting effect evaluation criteria>
The elasticity imparting effect is evaluated in comparison with Examples 38 and 42 to 45 in which the mass ratio of propylene carbonate/ethylene carbonate is 50/50.
1. There is no improvement in elasticity.
2. There is only a slight improvement in elasticity.
3. There is a slight improvement in elasticity.
4. There is an improvement in elasticity.
5. There is a significant improvement in elasticity.

As shown in Examples 53 to 59, the content of alkylene carbonate is 30% by mass or more, and the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, and the oxidative hair dye. When the drug contains 0.3 to 6% by mass of levulinic acid and the content of protein and/or dimaleic acid compound is 0.1 to 4.5% by mass, which is a uniform mixture of bleaching agent and decolorizing agent (bleaching agent). A sufficient treatment effect and a hair damage suppressing effect (clumping effect, gloss effect) were obtained, and a sufficient smoothing effect and a sufficient elasticity imparting effect were obtained. On the other hand, as shown in Comparative Examples 14 and 15, alkylene carbonate, or a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or a bleaching agent. If the protein and/or dimaleic acid compound content of the drug uniformly mixed with (bleaching agent) is outside the above range, the treatment effect and hair damage prevention effect (clumping effect, gloss effect) may be insufficient, or the elasticity imparting effect may be insufficient. was insufficient.

(Examples 60-66, Comparative Examples 16-17)
A hair treatment agent having the composition listed in Table 9 below was prepared by stirring and mixing until each component became uniform.
A uniform mixture of the prepared hair treatment agent, hair straightening first agent, permanent wave first agent, heated permanent wave first agent, oxidative hair dye, and bleaching agent (bleaching agent) was applied to the hair straightening treatment. , hair straightening agent 1, permanent wave agent 1, heated permanent wave agent 1, oxidation dyeing of the permanent wave treatment, the heating permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Used as a hair conditioner and bleaching agent. The treatment effect, damage suppression effect, and moist feeling imparting effect when polyhydric alcohol was contained were evaluated using the methods described above. The evaluation criteria for the moist feeling imparting effect when polyhydric alcohol is contained are as follows.

<Evaluation criteria for moisturizing effect>
The moist feeling imparting effect is evaluated in comparison with Examples 38 and 42 to 45 in which the mass ratio of propylene carbonate/ethylene carbonate is 50/50.
1. There is no improvement in the moist feeling.
2. There is only a slight improvement in the moist feeling.
3. There is a slight improvement in the moist feeling.
4. There is an improvement in the moist feeling.
5. There is a significant improvement in the moist feeling.

As shown in Examples 60 to 66, the content of alkylene carbonate is 30% by mass or more, and the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, and the oxidative hair dye. When the content of polyhydric alcohol in the drug uniformly mixed with bleaching agent and decolorizing agent (bleaching agent) is 0.3 to 10% by weight, the content of levulinic acid is 0.3 to 6% by weight, or the content of levulinic acid is 0.3 to 6% by weight. When the acid content is 0.3 to 6% by weight and the content of protein and/or dimaleic acid compound is 0.1 to 4.5% by weight, sufficient treatment effects and hair damage suppression effects (clumping effect, shine effect) was obtained, and a sufficient moist feeling imparting effect was obtained, and furthermore, a sufficient smooth imparting effect, or a sufficient smooth imparting effect and a sufficient elasticity imparting effect were obtained. On the other hand, as shown in Comparative Examples 16 and 17, alkylene carbonate, or a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or a bleaching agent. If the content of polyhydric alcohol in the drug uniformly mixed with (bleaching agent) is outside the above range, the treatment effect and hair damage prevention effect (clumping effect, gloss effect) or moisturizing effect will be insufficient. Met.

(Examples 67-74, Comparative Examples 18-19)
A hair treatment agent having the composition listed in Table 10 below was prepared by stirring and mixing until each component became uniform.
A uniform mixture of the prepared hair treatment agent, hair straightening first agent, permanent wave first agent, heated permanent wave first agent, oxidative hair dye, and bleaching agent (bleaching agent) was applied to the hair straightening treatment. , hair straightening agent 1, permanent wave agent 1, heated permanent wave agent 1, oxidation dyeing of the permanent wave treatment, the heating permanent wave treatment, the oxidative hair dye treatment, and the bleaching treatment. Used as a hair conditioner and bleaching agent. The treatment effect, the damage-preventing effect, and the effect of imparting ease of finger passage when containing a cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol were evaluated using the methods described above. The evaluation criteria for the effect of imparting ease of finger passage in the case of containing a cationic substance that can be dissolved in levulinic acid and/or a polyhydric alcohol are as follows.

<Evaluation criteria for improving finger smoothness>
The effect of imparting ease of finger passage is evaluated in comparison with Examples 38 and 42 to 45 in which the mass ratio of propylene carbonate/ethylene carbonate is 50/50.
1. There is no improvement in the ease of fingering.
2. There is only a slight improvement in the ease of fingering.
3. There is a slight improvement in the ease of fingering.
4. There is an improvement in the ease of fingering.
5. The ease of fingering has been greatly improved.

As shown in Examples 67 to 74, the content of alkylene carbonate is 30% by mass or more, and the first agent for hair straightening, the first agent for permanent waving, the first agent for heated permanent waving, and the oxidative hair dye. A drug containing 0.3 to 6% by mass of levulinic acid and/or 0.3 to 10% by mass of polyhydric alcohol, which is a uniform mixture of levulinic acid and a decolorizing agent (bleaching agent), and contains levulinic acid and/or polyhydric alcohol. If the content of cationic substances that can be dissolved in is 0.1 to 4.5% by mass or more, the content of levulinic acid is 0.3 to 6% by mass, or levulinic acid is 0.3 to 6% by mass. %, and the content of protein and/or dimaleic acid compound is 0.1 to 4.5% by mass, and/or the content of polyhydric alcohol is 0.3 to 10% by mass, sufficient treatment effect is obtained. and a hair damage suppressing effect (clumping effect, luster effect), a sufficient smoothing effect and/or a sufficient moisturizing effect, and a sufficient fingerability imparting effect; A smoothening effect, or a sufficient smoothness imparting effect, a sufficient elasticity imparting effect, and/or a sufficient moist feeling imparting effect were obtained. On the other hand, as shown in Comparative Examples 18 to 19, alkylene carbonate, or a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, or a bleaching agent. If the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol in the drug uniformly mixed with (bleaching agent) is outside the above range, the treatment effect and hair damage prevention effect (clumping effect, shine effect) will be insufficient. Or, the effect of imparting ease of passing through the fingers was insufficient.

(Examples 75-81, Comparative Examples 20-24)
A hair treatment agent having the composition listed in Table 11 below was prepared by stirring and mixing until each component became uniform.
The prepared hair treatment agent was used as a pretreatment agent before treatment and was evaluated by the following method. The repair effect was judged from the cohesive effect and gloss effect. Evaluation criteria for cohesive effect, evaluation criteria for gloss effect, evaluation criteria for smoothing effect when containing levulinic acid, evaluation criteria for elasticity imparting effect when containing protein and/or dimaleic acid compound, contains polyhydric alcohol. The evaluation criteria for the effect of imparting a moist feeling in the case where the material is moist, and the evaluation criterion for the effect of imparting smoothness in the fingers in the case of containing a cationic substance that can be dissolved in levulinic acid and/or a polyhydric alcohol are as follows.

<Creation of test hair bundles for evaluation in treatment treatments>
Human hair (Chinese) was cut to a length of 30 cm to create a hair bundle weighing 3 g. Next, the hair is washed with a commercially available shampoo, treated with a commercially available powder type bleaching agent and 2 agents (6% hydrogen peroxide), washed twice with a commercially available shampoo, thoroughly towel dried, and the hair strands are washed with a commercially available shampoo. Fix one end of the tube, hang it vertically, and leave it at room temperature for 24 hours. Thereafter, the hair was treated again with a commercially available powder type bleaching agent and two agents (6% hydrogen peroxide), washed twice with a commercially available shampoo, and thoroughly towel-dried to form a test hair bundle.

<Hair treatment procedure 1>
1 g of the prepared hair treatment agent is applied to the test hair bundle, thoroughly blended with a comb, and 4 g of a commercially available treatment is applied again, and left for 15 minutes. Then, wash off the treatment thoroughly with hot water. Thoroughly towel dry the hair, arrange it with a comb, fix one end of the hair bundle, hang it vertically, leave it at room temperature for 24 hours, and dry it thoroughly. Based on the evaluation criteria below, a hairdresser with over 10 years of experience Evaluated by 3 people.

<Treatment treatment cohesive effect evaluation criteria>
Comparison with the commercially available treatment used in Treatment Procedure 1 1. It's a little disorganized.
2. The cohesion is the same.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Treatment treatment gloss effect evaluation criteria>
Comparison with the commercially available treatment used in Treatment Procedure 1 1. The gloss is a little poor.
2. The gloss is the same.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

<Smoothness imparting effect evaluation criteria>
The effect of imparting smoothness is evaluated in comparison with Example 75.
1. There is no improvement in smoothness.
2. There is only a small improvement in smoothness.
3. There is a slight improvement in smoothness.
4. There is an improvement in smoothness.
5. There is a huge improvement in smoothness.
<Elasticity imparting effect evaluation criteria>
The effect of imparting elasticity is evaluated in comparison with Example 75.
1. There is no improvement in elasticity.
2. There is only a slight improvement in elasticity.
3. There is a slight improvement in elasticity.
4. There is an improvement in elasticity.
5. There is a significant improvement in elasticity.
<Evaluation criteria for moisturizing effect>
The effect of imparting a moist feeling is evaluated in comparison with Example 75.
1. There is no improvement in the moist feeling.
2. There is only a slight improvement in the moist feeling.
3. There is a slight improvement in the moist feeling.
4. There is an improvement in the moist feeling.
5. There is a significant improvement in the moist feeling.
<Evaluation criteria for improving finger smoothness>
The effect of imparting ease of finger passage is evaluated in comparison with Example 75.
1. There is no improvement in the ease of fingering.
2. There is only a slight improvement in the ease of fingering.
3. There is a slight improvement in the ease of fingering.
4. There is an improvement in the ease of fingering.
5. The ease of fingering has been greatly improved.

As shown in Examples 75 to 81, when the weight ratio of propylene carbonate/ethylene carbonate in the hair treatment agent is 100/0 to 10/90 and the content of alkylene carbonate is 10% by weight or more, sufficient repair effect is obtained. (A cohesive effect, a glossy effect) were obtained. Furthermore, the content of levulinic acid is 1% by mass or more, or the content of levulinic acid is 1% by mass or more and the content of protein and/or dimaleic acid compound is 0.5% by mass or more, and/or polyvalent A cationic substance containing 1% by mass or more of alcohol and/or 1% by mass or more of levulinic acid and/or 1% by mass or more of polyhydric alcohol and can be dissolved in levulinic acid and/or polyhydric alcohol. When the content of and/or a sufficient smoothness imparting effect and/or a sufficient moist feeling imparting effect and a sufficient fingerability imparting effect were obtained. On the other hand, as shown in Comparative Example 20, when the content of levulinic acid was outside the above range, the smoothening effect was insufficient. As shown in Comparative Example 21, when the content of protein and/or dimaleic acid was outside the above range, the elasticity imparting effect was insufficient. As shown in Comparative Example 22, when the content of polyhydric alcohol was outside the above range, the moist feeling imparting effect was insufficient. As shown in Comparative Example 23, when the content of the cationic substance soluble in levulinic acid and/or polyhydric alcohol was outside the above range, the effect of imparting ease of finger passage was insufficient. As shown in Comparative Example 24, when the content of alkylene carbonate was outside the above range, the repair effect (clumping effect, gloss effect) was insufficient.

(Examples 82-88, Comparative Examples 25-29)
A hair treatment agent having the composition listed in Table 12 below was prepared by stirring and mixing until each component became uniform.
The prepared hair treatment agent and treatment were uniformly mixed and evaluated by the following method, and the evaluation criteria were as follows. The repair effect was judged from the cohesive effect and gloss effect. The evaluation criteria for the cohesive effect and the gloss effect were evaluated according to the above-mentioned evaluation criteria. Evaluation criteria for smoothness imparting effect when containing levulinic acid, evaluation criteria for elasticity imparting effect when containing protein and/or dimaleic acid compound, evaluation criteria for moist feeling imparting effect when containing polyhydric alcohol, Levulin The evaluation criteria for the effect of imparting ease of finger passage in the case of containing a cationic substance soluble in acid and/or polyhydric alcohol are as follows.

<Hair treatment procedure 2>
Hair Treatment Test 5 g of a drug uniformly mixed with the prepared hair treatment agent and the commercially available treatment used in Hair Treatment Procedure 1 is applied to the hair bundle and left for 15 minutes. Then, thoroughly wash away the mixture of hair treatment agent and treatment with hot water. After towel drying the hair thoroughly and combing it, fix one end of the hair bundle and hang it vertically. Leave it at room temperature for 24 hours to dry thoroughly. Three hair stylists with over 10 years of experience evaluated the hair. did.

<Smoothness imparting effect evaluation criteria>
The effect of imparting smoothness is evaluated in comparison with Example 82.
1. There is no improvement in smoothness.
2. There is only a small improvement in smoothness.
3. There is a slight improvement in smoothness.
4. There is an improvement in smoothness.
5. There is a huge improvement in smoothness.
<Elasticity imparting effect evaluation criteria>
The effect of imparting elasticity is evaluated in comparison with Example 82.
1. There is no improvement in elasticity.
2. There is only a slight improvement in elasticity.
3. There is a slight improvement in elasticity.
4. There is an improvement in elasticity.
5. There is a significant improvement in elasticity.
<Evaluation criteria for moisturizing effect>
The effect of imparting a moist feeling is evaluated in comparison with Example 82.
1. There is no improvement in the moist feeling.
2. There is only a slight improvement in the moist feeling.
3. There is a slight improvement in the moist feeling.
4. There is an improvement in the moist feeling.
5. There is a significant improvement in the moist feeling.
<Evaluation criteria for improving finger smoothness>
A comparison with Example 82 will evaluate the effect of imparting ease of finger passage.
1. There is no improvement in the ease of fingering.
2. There is only a slight improvement in the ease of fingering.
3. There is a slight improvement in the ease of fingering.
4. There is an improvement in the ease of fingering.
5. There is a significant improvement in the ease of fingering.

As shown in Examples 82 to 88, when the hair treatment agent was uniformly mixed into the hair treatment and the content of alkylene carbonate was 2% by mass or more, sufficient repair effects (clumping effect, gloss effect) were obtained. . Furthermore, the content of levulinic acid is 0.3% by mass or more, or the content of levulinic acid is 0.3% by mass or more and the content of protein and/or dimaleic acid compound is 0.1% by mass or more, and/ Or, the content of polyhydric alcohol is 0.3% by mass or more, and/or the content of levulinic acid is 0.3% by mass or more and/or the polyhydric alcohol is 0.3% by mass or more, and levulinic acid and/or When the content of the cationic substance that can be dissolved in polyhydric alcohol is 0.1% by mass or more, a sufficient smoothening effect can be obtained, or a sufficient smoothening effect and a sufficient elasticity imparting effect can be obtained, and/ Alternatively, a sufficient moist feeling imparting effect was obtained, and/or a sufficient smooth feeling imparting effect and/or a sufficient moist feeling imparting effect and a sufficient finger smoothing effect imparting effect were obtained. On the other hand, as shown in Comparative Example 25, when the content of alkylene carbonate was outside the above range, the repair effect (clumping effect, gloss effect) was insufficient. As shown in Comparative Example 26, when the content of levulinic acid was outside the above range, the smoothing effect was insufficient. As shown in Comparative Example 27, when the content of protein and/or dimaleic acid was outside the above range, the elasticity imparting effect was insufficient. As shown in Comparative Example 28, when the content of polyhydric alcohol was outside the above range, the moist feeling imparting effect was insufficient. As shown in Comparative Example 29, when the content of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol was outside the above range, the effect of imparting ease of finger passage was insufficient.

(Examples 89 to 97, Comparative Examples 30 to 34)
A hair treatment agent having the composition listed in Table 13 below was prepared by stirring and mixing until each component became uniform.
The prepared hair treatment agent was used alone and evaluated by the following method, and the evaluation criteria were as follows. The repair effect was judged from the cohesive effect and gloss effect. Evaluation criteria for cohesive effect, evaluation criteria for gloss effect, evaluation criteria for smoothing effect when containing levulinic acid, evaluation criteria for elasticity imparting effect when containing protein and/or dimaleic acid compound, contains polyhydric alcohol. The evaluation criteria for the effect of imparting a moist feeling in the case where the material is moist, and the evaluation criterion for the effect of imparting smoothness in the fingers in the case of containing a cationic substance that can be dissolved in levulinic acid and/or a polyhydric alcohol are as follows.

<Hair treatment procedure 3>
5 g of the prepared hair treatment agent is applied to the test hair bundle, thoroughly blended with a comb, and left for 15 minutes. Then, rinse thoroughly with hot water. After arranging the hair with a comb, one end of the hair bundle was fixed and hung vertically, and the hair was left at room temperature for 24 hours to dry thoroughly. Three hairdressers with over 10 years of experience evaluated the hair.
<Hair treatment procedure 4>
5 g of the prepared hair treatment agent was diluted 10 times with water and slowly applied to the test hair bundle while combing with a comb, and left for 5 minutes. After that, without rinsing it off, dry it with a hairdryer while smoothing it with a comb. Then, use a hair straightening iron at 190°C for 10 seconds to straighten the hair. One end of the hair bundle was fixed and hung vertically, and after being left at room temperature for 24 hours, three hairdressers with more than 10 years of experience as beauticians evaluated the hair using the following evaluation criteria.

<Treatment treatment cohesive effect evaluation criteria>
Comparison with test hair bundles for evaluation in treatment treatment 1. The cohesion is the same.
2. The consistency is just a little better.
3. The consistency is somewhat good.
4. Well organized.
5. Very well put together.
<Treatment treatment gloss effect evaluation criteria>
Comparison with test hair bundles for evaluation in treatment treatment 1. The gloss is somewhat the same.
2. The shine is just a little better.
3. The gloss is slightly good.
4. Good shine.
5. Very good shine.

<Smoothness imparting effect evaluation criteria>
The effect of imparting smoothness is evaluated in comparison with Example 89.
1. There is no improvement in smoothness.
2. There is only a small improvement in smoothness.
3. There is a slight improvement in smoothness.
4. There is an improvement in smoothness.
5. There is a huge improvement in smoothness.
<Elasticity imparting effect evaluation criteria>
The effect of imparting elasticity is evaluated in comparison with Example 89.
1. There is no improvement in elasticity.
2. There is only a slight improvement in elasticity.
3. There is a slight improvement in elasticity.
4. There is an improvement in elasticity.
5. There is a significant improvement in elasticity.
<Evaluation criteria for moisturizing effect>
The moist feeling imparting effect is evaluated in comparison with Example 89.
1. There is no improvement in the moist feeling.
2. There is only a slight improvement in the moist feeling.
3. There is a slight improvement in the moist feeling.
4. There is an improvement in the moist feeling.
5. There is a significant improvement in the moist feeling.
<Evaluation criteria for improving finger smoothness>
The effect of imparting ease of finger passage is evaluated in comparison with Example 89.
1. There is no improvement in the ease of fingering.
2. There is only a slight improvement in the ease of fingering.
3. There is a slight improvement in the ease of fingering.
4. There is an improvement in the ease of fingering.
5. The ease of fingering has been greatly improved.

As shown in Examples 89 to 91, when the mass ratio of propylene carbonate/ethylene carbonate in the hair treatment agent was 100/0 to 10/90, sufficient repair effects (clumping effect, gloss effect) were obtained. As shown in Examples 92 to 97, the content of alkylene carbonate in the hair treatment agent is 5% by mass or more, and the content of levulinic acid is 0.3% by mass or more, or the content of levulinic acid is 0.3% by mass. % or more, the content of protein and/or dimaleic acid compound is 0.1% by mass or more, and/or the content of polyhydric alcohol is 0.3% by mass or more, and/or the content of levulinic acid is 0. .3% by mass or more and/or contains polyhydric alcohol by 0.3% by mass or more, and the content of cationic substances that can be dissolved in levulinic acid and/or polyhydric alcohol is 0.1% by mass or more, it is sufficient. A good repair effect (unifying effect, gloss effect) can be obtained, and a sufficient smoothing effect can be obtained, or a sufficient smoothing effect and a sufficient elasticity imparting effect can be obtained, and/or a sufficient moist feeling can be obtained. A sufficient smoothness imparting effect and/or a sufficient moist feeling imparting effect and a sufficient fingerability imparting effect were obtained. On the other hand, as shown in Comparative Example 30, when the content of levulinic acid was outside the above range, the smoothening effect was insufficient. As shown in Comparative Example 31, when the content of protein and/or dimaleic acid was outside the above range, the elasticity imparting effect was insufficient. As shown in Comparative Example 32, when the content of polyhydric alcohol was outside the above range, the moist feeling imparting effect was insufficient. As shown in Comparative Example 33, when the content of the cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol was outside the above range, the effect of imparting ease of finger passage was insufficient. As shown in Comparative Example 34, when the content of alkylene carbonate was outside the above range, the repair effect (clumping effect, gloss effect) was insufficient.

Claims (9)

A hair treatment agent comprising alkylene carbonate, which is propylene carbonate alone or a mixture of propylene carbonate and ethylene carbonate, and the mass ratio of propylene carbonate/ethylene carbonate is 100/0 to 10/90. The hair treatment agent according to claim 1, which contains levulinic acid. The hair treatment agent according to claim 2, containing a protein and/or a dimaleic acid compound. The hair treatment agent according to claim 1, which contains a polyhydric alcohol. The hair treatment agent according to claim 2, which contains a cationic substance that can be dissolved in levulinic acid and/or polyhydric alcohol. The hair treatment agent according to any one of claims 1 to 5 can be used as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent). 1. A hair treatment method characterized by applying as a pretreatment agent before applying to hair. The hair treatment agent according to any one of claims 1 to 5 can be used as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent). A hair treatment method characterized by uniformly mixing 2 to 20% by mass of hair. The hair treatment agent according to any one of claims 1 to 5 can be used as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, and a bleaching agent (bleaching agent). A hair treatment method characterized by applying an aqueous base other than the above before applying it to the hair. The hair treatment agent according to any one of claims 1 to 5 alone or as a first agent for hair straightening, a first agent for permanent waving, a first agent for heated permanent waving, an oxidative hair dye, A hair treatment method characterized by uniformly mixing with an aqueous base other than a bleaching agent and applying the mixture.