JP5288770B2 - First agent for straightening hair and agent for straightening hair - Google Patents

Description

  The present invention relates to a hair straightening agent for straightening curly hair and a first hair straightening agent for constituting the hair straightening agent.

  For treatments such as permanent wave and curly hair straightening, the first agent containing a reducing agent is used to reduce the cystine bond in the hair, and after making it a desired state, the state is fixed using a second agent containing an oxidizing agent. It is processing. In recent years, as described in Patent Document 1, a method for correcting curly hair using an iron has been developed and has been established as a beauty technique.

  In the case of straightening hair, it is necessary to treat the new part of the curly hair state in order to keep the hair in a straight state, so the curly hair is straightened at an average rate of once every 3 to 6 months. The process is usually repeated. However, the curly hair straightening treatment applies chemical treatment to the hair as described above, and the degree of damage to the hair increases as the number of treatments increases. Recently, chemical treatments such as bleaching and hair dyeing are often applied to the hair, and the hair is further damaged by these treatments.

  Recently, since there is a high need for keeping hair in a healthy state, for example, as shown in Patent Document 2 and Patent Document 3, agents for correcting curly hair having an effect of preventing hair damage have been developed.

JP 2004-2459 A JP 2006-16391 A JP 2006-298822 A

  As described above, for example, in order to keep the hair in a straight state, the hair that has been repeatedly subjected to the curly hair straightening treatment has been subjected to a number of curly hair straightening treatments as it approaches the hair tip, for example, the hair tip portion. The degree of damage is greatly different between the vicinity thereof and the new part and the vicinity thereof.

  Since the treatment effect of the curly hair straightening agent differs between parts with different damage levels, as described above, the hair has a high uniformity while maintaining a good feel of the hair, with the damage level being greatly different for each part. It has become difficult to achieve a straight state, and there is still room for improvement in this point even in the curly hair straightening agent having a hair damage effect as described above.

  The present invention has been made in view of the above circumstances, and the purpose of the present invention is to provide a highly uniform hair straightening treatment even for hair having a different degree of damage for each portion, and to treat the treated hair. An object of the present invention is to provide a first hair straightening agent for constituting a hair straightening agent capable of providing a soft feel, and a hair straightening agent composed of the first agent.

  The first agent for straightening hair of the present invention that has achieved the above object is a mixture of a reducing agent and an alkaline agent, and further comprises (A) a polyoxyethylene alkyl ether phosphate ester or a salt thereof, (B) a phosphate ester other than a polyoxyethylene alkyl ether phosphate ester or a salt thereof, (C) an ester comprising a dibasic acid and a monohydric alcohol, and (D) a cationic surfactant or a cationic polymer. It is what was mix | blended.

  The hair straightening agent of the present invention is composed of the first agent for straightening hair of the present invention and the second agent for straightening hair containing at least an oxidizing agent.

  As described above, hair damaged by repeating the curly hair straightening process has a different degree of damage from the root to the hair tip. Moreover, even in the unit of one hair, the surface portion is most damaged.

  When the degree of damage is different for each part of the hair, the degree of hydrophilicity of the hair is also different according to the difference in the degree of damage. Since the reducing agent blended in the first agent for straightening hair is a water-soluble compound, it reacts more strongly in the part of the hair where the degree of damage is greater and the degree of hydrophilicity is greater, and the degree of damage is relatively small. The reaction does not progress so much at the portion where the degree of hydrophilicity is small. As a result, it becomes difficult to cause the reduction reaction uniformly throughout the hair, and it becomes difficult to make the hair straight with high uniformity.

  As a result of intensive studies, the present inventors have found that the first agent for straightening hair containing a reducing agent and an alkaline agent includes (A) polyoxyethylene alkyl ether phosphate ester or salt thereof, (B) polyoxyethylene. Damage by blending a phosphate ester other than an alkyl ether phosphate or a salt thereof, (C) an ester composed of a dibasic acid and a monohydric alcohol, and (D) a cationic surfactant or a cationic polymer It has been found that the reduction reaction can be controlled so that the effect of the reducing agent is evenly generated even on the hair having different degrees for each part. And according to the curly hair straightening agent composed of the first curly hair straightening agent and the second curly hair straightening agent containing an oxidant, the degree of damage is different for each part. It was also found that the hair can be in a good straight state and the treated hair can have a soft feel.

  According to the present invention, a hair straightening agent that can perform hair straightening treatment with high uniformity even for hair having different damage degrees for each part and that can make the hair after treatment soft feel. The 1st agent for hair straightening which can be performed, and the said agent for hair straightening can be provided.

  In the first agent for straightening hair of the present invention, (A) component polyoxyethylene alkyl ether phosphate or salt thereof, and (B) component other than polyoxyethylene alkyl ether phosphate ester or The salt [hereinafter sometimes referred to as “a phosphate ester other than the component (A) or a salt thereof”] increases the permeability of the first agent for straightening hair including the reducing agent into the hair, and the reducing agent. It is a component which has the effect | action which draws out the effect | action of. By using these components (A) and (B), a good hair straightening action is brought out while suppressing chemical damage to the hair caused by the first agent for straightening hair. In addition, these components (A) and (B) are effective in protecting the hair and suppressing damage during the physical treatment of the hair with combing and high-temperature hairstyling iron during straightening of the hair, It also has the effect of enhancing the feel (softness and moistness) of the hair.

  In the polyoxyethylene alkyl ether phosphate ester or salt thereof as component (A), the number of moles of ethylene oxide added is not particularly limited. For example, the first agent for straightening hair is preferably an emulsion. The selection may be made in consideration of the stability of the emulsified state. Specific examples of the component (A) include, for example, polyoxyethylene oleyl ether phosphate, polyoxyethylene lauryl ether phosphate, polyoxyethylene cetyl ether phosphate, polyoxyethylene octyl ether phosphate, polyoxyethylene (4) Decyl ether phosphoric acid (numbers in parentheses above mean number of moles of oxyethylene units), polyoxyethylene alkylphenyl ether phosphoric acid, polyoxyethylene alkyl ether sodium phosphate (polyoxyethylene oleyl ether) Sodium phosphate, sodium polyoxyethylene lauryl ether phosphate, sodium polyoxyethylene cetyl ether phosphate, sodium polyoxyethylene alkylphenyl ether phosphate, etc.), polyoxyethylene alcohol Diphenylamine phosphate (polyoxyethylene oleyl ether phosphate diethanolamine, etc.), polyoxyethylene alkyl ether phosphate triethanolamine (polyoxyethylene alkylphenyl ether phosphate triethanolamine, polyoxyethylene lauryl ether phosphate triethanol) These may be used alone or in combination of two or more. Among these, polyoxyethylene cetyl ether phosphoric acid is more preferable because the effect of increasing the uniformity of the reduction reaction is better and the effect of keeping the emulsified state stable is also excellent.

  The blending amount of the polyoxyethylene alkyl ether phosphate ester or salt thereof in the first agent for straightening hair is preferably an emulsion as described above. Depending on the use, it is preferably 0.1% by mass or more, and more preferably 0.3% by mass or more from the viewpoint of more effectively exerting the effect of its use. Moreover, when there is too much quantity of the polyoxyethylene alkyl ether phosphate ester or its salt in the 1st agent for hair straightening, the viscosity of the 1st agent for hair straightening will become high too much and operativity may fall. Therefore, the blending amount is preferably 8% by mass or less, and more preferably 5% by mass or less.

  Examples of the phosphate ester other than the polyoxyethylene alkyl ether phosphate ester (B) or a salt thereof include, for example, dimethyl phosphate, cetyl phosphate, dicetyl phosphate, trioleyl phosphate, tristearyl phosphate, or These salts (sodium salt, potassium salt, etc.) etc. are mentioned, These may be used individually by 1 type and may use 2 or more types together. Among these, dicetyl phosphate is more preferable because the first hair straightening agent containing a reducing agent has a particularly good effect on enhancing the penetrability into hair and the effect of improving the feel of hair after treatment.

  Since the blending amount of the phosphate ester other than the polyoxyethylene alkyl ether phosphate ester or the salt thereof in the first agent for straightening hair is preferably as described above, the first agent for straightening hair is preferably an emulsion. However, from the viewpoint of more effectively exerting the effect of its use, it is preferably 0.1% by mass or more, more preferably 0.3% by mass or more. preferable. Moreover, when there is too much quantity of phosphate esters other than the polyoxyethylene alkyl ether phosphate ester in the 1st agent for hair straightening, or its salt, the viscosity of the 1st agent for hair straightening will become high too much and operativity. May decrease, the blending amount is preferably 5% by mass or less, and more preferably 3% by mass or less.

  The ester composed of dibasic acid and monohydric alcohol as component (C) is the same as the first hair straightening agent including reducing agent, regardless of the degree of damage in each part of the hair. Has the effect of penetrating well. That is, by using the component (C), the reduction reaction by the first agent for straightening hair can be controlled to occur more uniformly.

  Specific examples of the ester comprising a dibasic acid and a monohydric alcohol as component (C) include, for example, di-2-ethylhexyl succinate, diisopropyl adipate, di-2-ethylhexyl adipate, diethyl sebacate, and sebacic acid. Examples include diisopropyl, di-2-ethylhexyl sebacate, and dibutyloctyl sebacate. Among these, diethyl sebacate is preferable because it has a higher effect of promoting a uniform reduction reaction by the first agent for straightening hair.

  As the blending amount of the ester composed of a dibasic acid and a monohydric alcohol in the first agent for straightening hair, the effect due to its use is exhibited better, and the feel of the hair after treatment is further improved. From the viewpoint, it is preferably 0.001% by mass or more, and more preferably 0.003% by mass or more. However, if the amount of ester consisting of dibasic acid and monohydric alcohol in the first agent for straightening hair is too large, the viscosity of the first agent for straightening hair tends to change, The blending amount is preferably 5% by mass or less, and more preferably 3% by mass or less.

  The cationic surfactant or cationic polymer as the component (D) has an action (hereinafter referred to as “conditioning action”) that makes the hair after treatment have a soft feel that the hair originally has. In addition, by blending the cationic surfactant or cationic polymer as the component (D) with the first agent for straightening hair including the component (A) to the component (C) (that is, the present invention) Compared to the first agent for curly hair straightening by blending only the component (D) without blending the component (A), the component (B) and the component (C). The present inventors have also confirmed that the conditioning effect on hair is remarkably improved. The theory is not necessarily clear, but by blending the component (D) which is a cationic compound in the system containing the component (A) and the component (B) which are anionic compounds, the component (A) and (B This is considered to be because the conditioning action inherently possessed by the component (D), which is a cationic compound, is synergistically improved.

  Examples of the cationic surfactant as component (D) include aliphatic amine salts and quaternary ammonium salts and cyclic quaternary ammonium salts thereof. Examples of the aliphatic amine salt include amidoamine salts such as stearic acid diethylaminoethylamide and stearic acid dimethylaminopropylamide. Examples of the quaternary ammonium salt of the aliphatic amine salt include, for example, lauryltrimethylammonium chloride, lauryltrimethylammonium bromide, alkyl (16,18) trimethylammonium chloride, cetyltrimethylammonium chloride, cetyltrimethylammonium bromide, cetyltrimethylammonium chloride. Saccharin, stearyltrimethylammonium chloride, stearyltrimethylammonium chloride, alkyl (28) trimethylammonium chloride, diPOE (2) oleylmethylammonium chloride, diPOEstearylmethylammonium chloride, POE (1) POP (25) dimethylmethylammonium chloride, Monoalkyl quaternary ammonium salts such as POP methyldiethylammonium chloride; dialkyl (12-15) dimethyl chloride Dialkyl types such as ammonium, dialkyl (12-18) dimethylammonium chloride, dialkyl (14-18) dimethylammonium chloride, dicocoyldimethylammonium chloride, dicetyldimethylammonium chloride, distearyldimethylammonium chloride, isostearyl lauryldimethylammonium chloride Quaternary ammonium salts; trialkyl type quaternary ammonium salts such as triPOE (5) stearylammonium chloride; such as benzalkonium chloride, myristyldimethylbenzylammonium chloride, lauryldimethyl (methylbenzyl) ammonium chloride, stearyldimethylbenzylammonium chloride Benzalkonium-type ammonium; and the like. In each of the exemplified compounds, the numerical value in parentheses after “alkyl” means the carbon number of the alkyl group, and “POE” is an abbreviation for polyoxyethylene, and the numerical value in parentheses after that is polyoxyethylene. “POP” is an abbreviation for polyoxypropylene, and the numerical value in parentheses after that means the number of added moles of the polyoxypropylene unit.

  Examples of the cationic polymer as the component (D) include quaternized cellulose (such as chlorinated O- [2-hydroxy-3- (trimethylammonio) propyl] hydroxyethylcellulose), O- [2-hydroxy chloride]. -3- (Trimethylammonio) propyl] guar gum, vinylpyrrolidone / N, N-dimethylaminoethyl methacrylic acid copolymer diethyl sulfate, polydimethylmethylene piperidinium chloride, diallyl quaternary ammonium salt as constituent units Polymer (dimethyldiallylammonium chloride / acrylamide copolymer, acrylamide / acrylic acid / dimethyldiallylammonium chloride copolymer, etc.), acrylic acid / acrylamide / methacrylamidopropyltrimonium chloride, cationized starch, cationized polymer Peptide, and an amino-modified silicone.

  As the first agent for straightening hair, the cationic surfactant and the cationic polymer exemplified above may be used alone or in combination of two or more. Moreover, only the cationic surfactant or only the cationic polymer may be used for the first agent for straightening hair, and the cationic surfactant and the cationic polymer may be used in combination.

  There is no restriction | limiting in particular in the quantity of (D) component in the 1st agent for curly hair straightening, According to the grade of the component composition of the 1st agent for hair curling straightening, and the effect (the softness improvement effect of the hair after a process) In the case of a cationic surfactant, the blending amount is preferably 0.5% by mass or more from the viewpoint of better exerting its action, and is preferably 1% by mass or more. It is more preferable that In addition, if the amount of the cationic surfactant in the first agent for straightening hair is too much, the hair after treatment tends to be sticky, and therefore the blending amount is preferably 10% by mass or less, More preferably, it is 5 mass% or less.

  Moreover, when using a cationic polymer as (D) component, it is preferable that the compounding quantity in the 1st agent for curly hair correction is 0.01 mass% or more from a viewpoint of exhibiting the effect | action more favorably, It is more preferable that it is 0.03 mass% or more. In addition, if the amount of the cationic polymer in the first agent for straightening hair is too large, the hair after treatment tends to be sticky, so the blending amount is preferably 3% by mass or less, preferably 2% by mass. % Or less is more preferable.

  Moreover, it is preferable that the 1st agent for hair straightening contains isopropanol other than each component of said (A)-(D), In that case, the effect of this invention improves more. .

  The content (blending amount) of isopropanol in the first agent for straightening hair is preferably 0.001% by mass or more, more preferably 0.003% by mass or more, from the viewpoint of more effectively exerting the effect of using isopropanol. It is more preferable that However, if the amount of isopropanol in the first agent for straightening hair is too large, the scent of the first agent for straightening hair tends to be damaged by the raw material odor of isopropanol. It is preferably 5% by mass or less, and more preferably 3% by mass or less.

  Further, the first agent for straightening hair contains a wax component that is solid at 25 ° C. from the viewpoint of improving the operability of keeping the hair straight when the first agent for straightening hair is applied. Is also preferable. Examples of the wax component include esters (waxes) of fatty acids derived from animals and plants and aliphatic alcohols, fats and oils mainly composed of triglycerides, and hydrocarbons derived mainly from petroleum. Among these, as a solid at 25 ° C., for example, cacao butter, molasses, shea butter, mango butter, carnal barrow, candelilla wax, rice bran wax, shellac, lanolin, beeswax, ozokerite, ceresin, paraffin, microcrystalline wax, Examples include petroleum jelly.

  The content (mixing amount) of the solid wax at 25 ° C. in the first agent for straightening hair is adjusted so that, for example, the viscosity of the first agent for straightening hair is suitable for application to hair. However, it is preferably at least 0.1 mass%, more preferably at least 0.2 mass%, preferably at most 5 mass%, more preferably at most 3 mass%.

  A reducing agent is used as the first agent for straightening hair, and this reducing agent is not particularly limited as long as it has the ability to reduce keratin, which is a protein in hair. For example, thioglycolic acid And various reducing agents having mercapto groups such as cysteine and derivatives thereof and salts thereof (hydrochloride, etc.), sulfites, hydrogen sulfites, etc. It is done. These reducing agents may be used alone or in combination of two or more.

  The blending amount of the reducing agent in the first agent for straightening hair may be appropriately adjusted according to the required reducing power, but is, for example, preferably 1% by mass or more, more preferably 3 in terms of thioglycolic acid. It is at least mass%, preferably at most 13 mass%, more preferably at most 11 mass%. The “thioglycolic acid equivalent value” related to the amount of reducing agent in the first hair straightening agent referred to here is “Permanent Wave Approval Manufacturing (Import) Approval” issued by Permanent Wave Industrial Association. “(1) First agent” in “1. Cold-dissolved permanent wave agent containing thioglycolic acid or its salts” in “[Appendix] Permanent wave agent quality standard” of “Standard” The content of the reducing substance after acid boiling (as thioglycolic acid (%)) determined by the method defined in “(c) Reducing substance after acid boiling” described in 1.

  In addition, an alkaline agent is used as the first agent for straightening hair, but the alkaline agent is not particularly limited as long as it has an alkaline ability. For example, ammonia, amines, neutral salt type Alkaline agents, basic amino acids and the like can be mentioned. Examples of amines include monoethanolamine and isopropanolamine. Examples of the neutral salt type alkaline agent include ammonium hydrogen carbonate, sodium hydrogen carbonate, ammonium hydrogen phosphate, and the like. Examples of basic amino acids include lysine and arginine. These alkaline agents may be used alone or in combination of two or more.

  The blending amount of the alkaline agent in the first agent for straightening hair may be appropriately adjusted according to the degree of swelling required for the hair to be treated, but is usually 0.01% by mass or more and 20% by mass or less, It is more preferably 0.05% by mass or more, and more preferably 10% by mass or less.

  In addition, the first agent for straightening hair includes dithiodiglycolic acids [dithiodiglycolic acid and dithiodiglycolic acid salts (diammonium salts, diethanolamine salts, triethanolamine salts, etc.)] as reaction modifiers. Usually formulated. The content (blending amount) of dithiodiglycolic acids in the first agent for straightening hair is preferably 0.1 to 4% by mass.

  Further, the first agent for straightening hair can be blended with various additives added to conventionally known hair straightening agents and other hair cosmetics in addition to the above-mentioned components. it can. Such additives include, for example, esters [excluding those that can correspond to (A) component, (B) component, (C) component and a wax component solid at 25 ° C.], silicones, humectants, Anionic surfactant [excluding polyoxyethylene alkyl ether phosphate ester or its salt as component (A)], amphoteric surfactant, anionic polymer, chelating agent, anti-inflammatory agent, antioxidant, plant Examples include seaweed extract, amino acids and peptides, UV absorbers, preservatives, and fragrances.

  The first agent for straightening hair is preferably an emulsion, and may be in the form of a cream, lotion, gel or the like, but in terms of applicability to hair, the cream It is preferable to use a shaped emulsion.

  The first agent for straightening hair uses water as the main dispersion medium. In addition, some of the various components may be dissolved in water. Further, the dispersion medium may be all water, and may contain an organic solvent such as a lower alcohol (such as ethanol, an alcohol having 6 or less carbon atoms excluding isopropanol). However, if the amount of the organic solvent in the dispersion medium increases, the scalp may be irritated. Therefore, the content of the organic solvent in the dispersion medium is preferably 5% by mass or less, for example. Moreover, it is preferable that the compounding quantity of the dispersion medium in the 1st agent for curly hair correction is 40-98 mass%, for example.

  The viscosity of the first agent for straightening hair is, for example, a viscosity measured under the condition of 12 rpm using a No. 4 rotor using a B-type viscometer (hereinafter the same as the viscosity described in the present specification). , 3000 to 40000 mPa · s is preferable. In addition, when applied to straightening hair using an iron, the viscosity of the first agent for straightening hair is more preferably 3000 to 20000 mPa · s, and applied to straightening without using an iron. In that case, the viscosity of the first agent for straightening hair is more preferably 20,000 to 40,000 mPa · s. Generally, in the hair straightening treatment without using an iron, it is necessary to keep the hair in a straight shape by the first hair straightening agent applied to the hair, but when the first hair straightening agent has a high viscosity, This is because, for example, a harder cream can be obtained, and the applied hair can be easily maintained in a straight shape.

  In addition, when it is necessary to adjust the viscosity of the first agent for straightening hair, in addition to adjusting the blending amount of each of the above components, higher alcohols (lauryl alcohol, myristyl alcohol, cetyl alcohol, Saturated or unsaturated alcohols having 8 to 22 carbon atoms such as stearyl alcohol, oleyl alcohol, and behenyl alcohol) can be used. In particular, the adjustment of the amount of the wax component that is solid at 25 ° C. is also effective for adjusting the viscosity of the first agent for straightening hair.

  The hair straightening agent of the present invention comprises the first agent for straightening hair of the present invention and the second agent for straightening hair. The second agent for straightening hair constituting the hair straightening agent of the present invention is one in which at least an oxidizing agent is blended.

  As the oxidizing agent, an oxidizing agent used in conventionally known hair straightening agents can be used. Examples thereof include hydrogen peroxide and sodium bromate. In the case of hydrogen peroxide, the blending amount of the oxidizing agent in the second agent for straightening hair is, for example, preferably 1% by mass or more, preferably 2% by mass or less, more preferably 1.5% by mass. It is as follows. In the case of sodium bromate, for example, it is preferably 5% by mass or more, preferably 10% by mass or less, more preferably 8% by mass or less.

  The second agent for straightening hair can be in the form of cream, lotion, gel or the like.

  Further, the second agent for straightening hair also uses water as the main dispersion medium, like the first agent for straightening hair. As the dispersion medium, water alone may be used. If necessary, an organic solvent such as ethanol, isopropanol or the like lower alcohol (alcohol having 6 or less carbon atoms) is used in an amount of about 5% by mass or less in the total amount of the dispersion medium. May be used in combination with water. Moreover, it is preferable that the compounding quantity of the dispersion medium in the 1st agent for curly hair correction is 60-98 mass%, for example.

  Furthermore, the second agent for straightening hair can be blended with conventionally known hair straightening agents and various additives added to other hair cosmetics, if necessary. As such an additive, the various materials illustrated as an additive which can be used for the 1st agent for curly hair straightening are mentioned, for example.

  The straightening treatment method for curly hair using the curly hair straightening agent of the present invention includes applying the first curly hair straightening agent to the hair, straightening and straightening the hair, and then washing the hair. Then, the method of applying the second agent for straightening hair after removing the first agent for straightening hair and drying it can be employed. And after application | coating of the 2nd agent for curly hair correction, hair is wash | cleaned and dried, and a process is complete | finished. In addition, after apply | coating the 1st agent for hair straightening, it is preferable to wash | clean hair and wash away the 1st agent for hair straightening applied and to dry hair and to correct.

  As a method of straightening hair after applying the first curly hair straightening agent, for example, the hair is straightened by combing or the like, and in such a state that the hair is straightened, a dryer or other dryer Alternatively, a method such as heating with a humidifier can be employed.

  Further, after the above-mentioned correction, it is possible to perform further correction using a high-temperature hair-styling iron. By adopting such a correction method, the hair can be made straighter. Currently, when performing hair straightening in a beauty salon, such a method for straightening hair using an iron is common.

  When using a high-temperature hairstyling iron, the surface temperature should be 60 ° C. or higher, more preferably 80 ° C. or higher, 220 ° C. or lower, more preferably 200 ° C. or lower, more preferably 180 ° C. or lower. Is desirable. And in order to straighten hair using the high-temperature hair-styling iron whose surface temperature is adjusted in this way, for example, after applying the first agent for curly hair straightening, the straightened hair straightened is washed. After the first agent for straightening hair is removed and preferably dried, further correction is performed with a high-temperature hair-styling iron. As the straightening treatment using the high-temperature hair-styling iron, for example, a method of taking a hair bundle, sandwiching the hair from the root with the iron, and sequentially processing in the direction of the hair tip is preferable. The time for sandwiching the hair with the iron is preferably 2 seconds or less, and it is preferable not to treat the same portion twice. When the treatment is performed for more than 2 seconds, protein denaturation of the hair due to heat occurs, which may lead to hair damage.

  The iron for hot hair conditioning is not particularly limited as long as the surface can be adjusted to the above temperature and has a flat surface. For example, “thermal effect iron CR (trade name)”, “thermal effect iron FS” (Product name) "and" Thermal effect iron G short (Product name) "(both manufactured by Milbon) are preferably used.

  Hereinafter, the present invention will be described in detail based on examples. However, the following examples do not limit the present invention. In the following examples, “%” means “mass%”. In addition, as the blending amount of the first agent for straightening hair and the second agent for straightening hair, the blending amount of each component is shown in% so that it becomes 100% as a whole. The display is omitted and only the numerical value indicating the blending amount is displayed.

The raw materials used in the examples and comparative examples are as follows.
(1) “Codamol CS 20 Acid (trade name)” manufactured by Croda Japan Co., Ltd .: 40% polyoxyethylene cetyl ether phosphoric acid [component (A)], 20% dicetyl phosphate [component (B)], cetearyl alcohol Contains 40% (a mixture of cetyl alcohol and stearyl alcohol).
(2) “NIKKOL DES-SP (trade name)” manufactured by Nikko Chemicals Co., Ltd .: diethyl sebacate [component (C)].
(3) “Cotamine 86W (trade name)” manufactured by Kao Corporation: Stearyltrimethylammonium chloride [component (D)].
(4) “JR-30M (trade name)” manufactured by Union Carbide Corporation: cationized cellulose [component (D)].
(5) “IPA-SG-C (trade name)” manufactured by Mitsui Chemicals, Inc .: isopropanol.
(6) “Purified beeswax” manufactured by Miki Chemical Co., Ltd .: beeswax.
(7) “PARAFFIN WAX (trade name)” manufactured by Nippon Seiwa Co., Ltd .: Paraffin.

Examples 1-8 and Comparative Examples 1-4
First agents for straightening hair of Examples 1 to 8 and Comparative Examples 1 to 4 were prepared according to the formulations shown in Tables 1 and 2. Moreover, the 2nd agent for curly hair correction was prepared by the prescription shown in Table 3.

  In the column of purified water in Tables 1 and 2, “100 in total” means 100% by adding the amount of purified water to the total amount of each component other than purified water constituting the first agent for straightening hair. It means that it became to become. In Table 3, the “purified water” in the column of “100” means that the total amount of each component other than the purified water constituting the second agent for straightening hair is 100% by adding the amount of purified water. It means to have become.

  In addition, pH of the 1st agent for hair straightening of Examples 1-8 and Comparative Examples 1-4 shown in Table 1 and Table 2 is about 9.2. In addition, as shown in Table 3, the second agent for straightening hair was adjusted to a pH of 3.3 by blending disodium hydrogen phosphate as a pH adjuster.

  Combining the first agent for straightening hair of Examples 1 to 8 and Comparative Examples 1 to 4 with the second agent for straightening curly hair, the hair straightening of Examples 1 to 8 and Comparative Examples 1 to 4 A preparation was made up. As will be described later, in this example, the evaluation of the effect of straightening the curly hair with the curly hair straightening agent is performed both in the case of the curly hair straightening process using the iron and in the case of the curly hair straightening process not using the iron. In addition to each component shown in Table 1 and Table 2, cetearyl alcohol is used as a viscosity modifier in the first hair straightening agent according to the hair straightening agent applied when using an iron. The viscosity was adjusted to 8000 mPa · s. Moreover, in addition to each component shown in Table 1 and Table 2, cetearyl alcohol is used to adjust the viscosity of the first curly hair straightening agent for the evaluation of the hair straightening agent for evaluation by the hair straightening treatment without using an iron. It mix | blended as an agent and those viscosity was adjusted to 35000 mPa * s.

<Hair straightening treatment>
From the curly hair collected from the healthy hair of the same person, a plurality of hair bundles having a length of 22.0 cm (measured in a natural state without stretching) and a weight of 0.5 g were prepared. Washed with aqueous sodium lauryl sulfate and dried.

[Hair straightening using an iron]
For each of the hair bundles washed with the 10% aqueous sodium lauryl sulfate solution and dried, first, the first hair straightening treatment was applied to the part from one end to half the full length. The first hair straightening agent according to the hair straightening agent of Examples 1 to 8 or Comparative Examples 1 to 4 is applied to each portion from one end of each hair bundle to half the full length by 1.0 g each. The hair bundle after application was straightened and left at room temperature for 15 minutes, then washed with water and dried with a dryer. These hair bundles were straightened with a hair iron adjusted to 180 ° C., and then 1.0 g of a second hair straightening agent was applied to the portion where the first hair straightening agent was applied. It was allowed to stand for a minute, then washed with water and dried with a dryer to complete the first hair straightening treatment.

  Next, for each hair bundle subjected to the first hair straightening treatment, a second hair straightening treatment was performed. 2.0 g each of the first hair straightening agent according to the hair straightening agent of Examples 1 to 8 or Comparative Examples 1 to 4 is applied to each whole hair bundle subjected to the first hair straightening treatment. After coating, the hair bundle after coating was straightened and left at room temperature for 15 minutes, then washed with water and dried with a dryer. After these hair bundles were straightened with a hair iron adjusted to 180 ° C., 2.0 g of the second hair straightening agent was applied to the whole hair bundle and left for 5 minutes, and then washed with water. Then, the hair was dried with a drier and the second hair straightening treatment was completed. Each of the hair bundles subjected to these two curly hair straightening treatments was evaluated as described below.

[Hair straightening without iron]
For each hair bundle that has been washed with the 10% aqueous sodium lauryl sulfate solution and dried (the hair bundle that has not been subjected to straightening treatment using the iron), the iron is used except that no iron is used. Twice hair straightening treatment was performed by the same method as the hair straightening treatment used. Each of these hair bundles was evaluated as described below.

<Evaluation of uniformity of straight shape>
For the hair bundle subjected to each of the above-described curly hair straightening treatment, the straightness of the hair (the connection between the portion that has undergone the first curly hair straightening treatment and the portion that has undergone only the second straight hair straightening treatment) ) Was subjected to sensory evaluation by 20 professional panelists. Table 4 shows the evaluation results when the curly hair straightening treatment using the iron is performed, and Table 5 shows the evaluation results when the hair curling straightening processing without using the iron is performed. The evaluation criteria are as follows, and it can be said that those evaluated as ◎ and ○ have good straight shape uniformity.
A: Evaluated that 16 or more out of 20 panelists were uniform.
○: Of 20 panelists, 12 or more and 15 or less evaluated as uniform.
Δ: Of 20 panelists, 8 or more and 11 or less evaluated as uniform.
X: Evaluated that 7 or less of 20 panelists were uniform.

<Evaluation of softness of hair>
About the softness of the hair which concerns on the hair | bristle bundle after each said curly hair straightening process, it confirmed by the following torsional stress measurement and sensory evaluation. For the measurement of torsional stress, a torque sensing type torsional measurement device “KES-YN-1” manufactured by Kato Tech Co., Ltd. was used. The length of the sample hair was 2 cm, and the torsional stress was measured under the conditions of a torsional rotation speed of 120 ° / sec and a torsional rotation speed of ± 3 rotations. In addition, the sample hair used what was selected at random from the part which performed the hair straightening process among the hair bundles after a process. The smaller the numerical value obtained by the torsional stress measurement, the softer the hair.

The sensory evaluation of the softness of the hair was performed according to the following evaluation criteria by 20 professional panelists for the hair bundles after the above-mentioned curly hair straightening treatment. It can be said that the ones evaluated as 評 価 and ○ have soft hair.
◎: Out of 20 panelists, 16 or more were evaluated as being soft.
○: Of 20 panelists, 12 or more and 15 or less are evaluated as being soft.
Δ: Evaluated that 8 to 11 out of 20 panelists are soft.
X: Evaluated that 7 or less of 20 panelists are soft.

  Table 4 shows the evaluation results of the softness of the hair when the hair straightening treatment using the iron is performed, and Table 5 shows the evaluation results of the softness of the hair when the hair straightening treatment without using the iron is performed. .

  As shown in Table 4 and Table 5, the hair bundle that has been subjected to hair straightening treatment with the hair straightening agent of Examples 1 to 8 (first agent for hair straightening of Examples 1 to 8) is used with an iron. Regardless of the presence or absence of hair, the uniformity of the portion that has undergone only one hair straightening treatment (the portion that has undergone only the second hair straightening treatment) and the portion that has undergone the second hair straightening treatment are excellent. It is. Therefore, according to the hair straightening agent of Examples 1 to 8 (the first hair straightening agent of Examples 1 to 8), even the hair having a different degree of damage is uniform throughout. It can be seen that the hair can be straightened with high efficiency.

  Moreover, the hair which concerns on the hair | bristle bundle which performed the hair straightening process with the hair straightening agent of Examples 1-8 (The 1st agent for hair straightening of Examples 1-8) is irrespective of the presence or absence of use of an iron. It is said that the torsional stress is smaller and softer than the hair related to the hair bundle treated with the curly hair straightening agent of Comparative Examples 1 to 4, and that the softness is good also by sensory evaluation by a panelist. The result is obtained.

  Further, among the hair straightening agents of the examples (first hair straightening agent), those of Examples 5 and 6 blended with isopropanol and a wax component (beeswax, paraffin) solid at 25 ° C. are blended. In Examples 7 and 8, the uniformity of the straight shape of the hair after the curly hair straightening treatment is particularly good.

Claims (5)

A first agent for straightening hair that contains a reducing agent and an alkali agent, and further (A) a polyoxyethylene alkyl ether phosphate or a salt thereof;
(B) Phosphoric acid esters other than polyoxyethylene alkyl ether phosphoric acid esters or salts thereof,
(C) diethyl sebacate, diisopropyl sebacate, di-2-ethylhexyl sebacate or dibutyloctyl sebacate , and (D) a cationic surfactant or cationic polymer as an ester composed of a dibasic acid and a monohydric alcohol A first agent for straightening hair that is formulated.   The first agent for straightening hair according to claim 1, further comprising isopropanol.   The first agent for straightening hair according to claim 1 or 2, wherein the ester composed of a dibasic acid and a monohydric alcohol is diethyl sebacate.   The first agent for straightening hair according to any one of claims 1 to 3, further comprising a wax component that is solid at 25 ° C.   5. A hair straightening agent comprising the first hair straightening agent according to any one of claims 1 to 4 and a second hair straightening agent containing at least an oxidizing agent.