Composition suitable for keratin fibers

Abstract

The present invention relates generally to a composition for keratin fibres, such as the hair, comprising: (a) at least one compound selected from the group consisting of glyoxylic acid, glyoxylic acid solvates, glyoxylate salts, glyoxylate esters, glyoxylic acid amides and mixtures thereof; and (b) at least one compound different from compound (a) selected from keto acids, salts thereof and mixtures thereof wherein the amount of compound (a) in the composition is less than 15% by weight relative to the total weight of the composition and the amount of compound (b) in the composition is 10% by weight or less. The invention can provide good texture, strength and moisture resistance to keratin fibers such as hair, which can extend the remodeling effect.

Description

Field of the Invention

[0001] The present invention mainly relates to a composition suitable for reshaping, preferably straightening keratin fibers such as hair. Background Art

[0002] Straightening keratin fibers such as hair by heating with an iron is popularly used to make unruly keratin fibers easier to manage and to give the keratin fibers a smaller volume and a more desirable appearance. This straightening method using a heating iron is convenient for quick styling, but the styling only lasts for a short time, for example until the next shampooing. Many consumers require a permanent straightening method.

[0003] On the other hand, conventional permanent straightening methods using reducing agents and alkali agents as well as oxidizing agents under heating can provide permanent styling for keratin fibers, but they have several disadvantages such as long processing times, damage to the keratin fibers, and foul odors.

[0004] WO 2014 / 131469 discloses a method for straightening keratin fibers by heating with an iron without using reducing agents and oxidizing agents, wherein glyoxylic acid is used for straightening keratin fibers.

[0005] Disclosure of the Invention

[0006] There is still a need to improve the reshaping of keratin fibers based on the treatment of keratin fibers with glyoxylic acid or its derivatives.

[0007] One object of the present invention is to provide a composition which can be used for reshaping keratin fibers such as hair based on the treatment of keratin fibers with glyoxylic acid or its derivatives, and which can provide good texture for the keratin fibers, such as a moisturizing feeling, strength, and moisture resistance, which can prolong the reshaping effect.

[0008] The above object of the present invention can be achieved by a composition for keratin fibers such as hair, the composition comprising:

[0009] (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide, and mixtures thereof; and

[0010] (b) at least one compound different from the compound of (a), which is selected from keto acids, their salts, and mixtures thereof,

[0011] wherein

[0012] the amount of the compound of (a) in the composition is less than 15% by weight relative to the total weight of the composition, and

[0013] The amount of the (b) compound in the composition is 10% by weight or less.

[0014] Based on the total weight of the composition, the amount of the (a) compound in the composition according to the present invention can be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more.

[0015] (b) The compound can be selected from levulinic acid, its salts, and mixtures thereof.

[0016] Based on the total weight of the composition, the amount of the (b) compound in the composition according to the present invention can be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more.

[0017] The composition according to the present invention can further comprise (c) water.

[0018] Based on the total weight of the composition, the amount of the (c) water in the composition according to the present invention can be 20% by weight to 95% by weight, preferably 30% by weight to 90% by weight, and more preferably 40% by weight to 85% by weight.

[0019] The composition according to the present invention can further comprise (d) at least one betaine compound.

[0020] (d) The betaine compound can be selected from trimethylglycine, carnitine, and L-proline betaine or stachydrine and mixtures thereof.

[0021] Based on the total weight of the composition, the amount of the (d) betaine compound in the composition according to the present invention can be 0.01% by weight to 15% by weight, preferably 0.05% by weight to 10% by weight, and more preferably 0.1% by weight to 5% by weight.

[0022] The pH of the composition according to the present invention can be 7 or lower, preferably 6 or lower, and more preferably 5 or lower.

[0023] The composition according to the present invention may not contain any ammonia or thiol compounds, or may contain less than 1% by weight, preferably less than 0.5% by weight, and more preferably less than 0.1% by weight of ammonia or thiol compounds based on the total weight of the composition.

[0024] The composition according to the present invention may not contain any reducing agent or oxidizing agent, or may contain less than 1% by weight, preferably less than 0.5% by weight, and more preferably less than 0.1% by weight of reducing agent or oxidizing agent based on the total weight of the composition.

[0025] The composition according to the present invention can be intended for reshaping, preferably for straightening keratin fibers such as hair.

[0026] In one embodiment, the present invention may relate to a composition comprising:

[0027] (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide and mixtures thereof, in an amount greater than 5% by weight, preferably greater than 6% by weight, and more preferably greater than 7% by weight, based on the total weight of the composition;

[0028] (b) at least one compound different from the compound of (a), selected from keto acids (especially levulinic acid), its salts and mixtures thereof, in an amount of 0.1% to 15% by weight, preferably 0.5% to 10% by weight, and more preferably 1% to 5% by weight, based on the total weight of the composition, and

[0029] (c) water.

[0030] The present invention also relates to a method of reshaping, preferably straightening keratin fibers such as hair, comprising the steps of:

[0031] (i) applying the composition according to the present invention to the keratin fibers;

[0032] (ii) optionally rinsing the keratin fibers and drying or not drying the keratin fibers after rinsing; and

[0033] (iii) reshaping, preferably straightening the keratin fibers, preferably at a temperature greater than 50°C, more preferably greater than 100°C, and even more preferably greater than 150°C.

[0034] In one embodiment, the present invention may relate to a method of reshaping, preferably straightening keratin fibers such as hair, comprising the steps of:

[0035] (i) applying the composition to the keratin fibers;

[0036] (ii) optionally rinsing the keratin fibers and drying or not drying the keratin fibers after rinsing; and

[0037] (iii) reshaping, preferably straightening the keratin fibers, preferably at a temperature greater than 50°C, more preferably greater than 100°C, and even more preferably greater than 150°C,

[0038] wherein

[0039] the composition comprises

[0040] (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide and mixtures thereof, in an amount greater than 5% by weight, preferably greater than 6% by weight, and more preferably greater than 7% by weight, based on the total weight of the composition;

[0041] (b) At least one compound different from the compound of (a), selected from keto acids (in particular levulinic acid), its salts and mixtures thereof, in an amount of 0.1% to 15% by weight, preferably 0.5% to 10% by weight, and more preferably 1% to 5% by weight, relative to the total weight of the composition, and

[0042] (c) Water.

[0043] The present invention also relates to a kit for reshaping, preferably straightening keratin fibers such as hair, comprising:

[0044] At least one selected from hair straighteners, curling irons, combs, hair dryers and combinations thereof, preferably at least one heated hair straightener, heated curling iron, heated comb or heated hair dryer, which is capable of providing a temperature greater than 50 °C, preferably greater than 100 °C, and more preferably greater than 150 °C to the keratin fibers; and

[0045] The composition according to the present invention. Brief Description of the Drawings

[0047] Figure 1 Schematic diagram showing how to measure the bending angles in Example 1 and Comparative Examples 1-4.

[0048] Best Mode for Carrying Out the Invention

[0049] Through diligent research, the inventors have found that a composition can be provided which can be used for reshaping keratin fibers such as hair based on treatment with glyoxylic acid or its derivatives, and which can provide good texture to the keratin fibers, such as a moisturizing feeling, strength and moisture resistance, which can prolong the reshaping effect.

[0050] Accordingly, the present invention mainly relates to a composition for keratin fibers such as hair, comprising:

[0051] (a) At least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide and mixtures thereof; and

[0052] (b) At least one compound different from the compound of (a), selected from keto acids, its salts and mixtures thereof,

[0053] wherein

[0054] the amount of the compound of (a) in the composition is less than 15% by weight relative to the total weight of the composition, and

[0055] the amount of the compound of (b) in the composition is 10% by weight or less.

[0056] The present invention can provide good texture, strength and moisture resistance to keratin fibers such as hair, which can prolong the reshaping effect.

[0057] The reshaping of keratin fibers such as hair herein includes straightening or curling the keratin fibers.

[0058] The present invention can provide good texture to keratin fibers such as hair, such as a moisturizing touch.

[0059] The present invention can reshape or deform keratin fibers such as hair. In addition, keratin fibers that have been treated with the present invention can be elastic.

[0060] The present invention can provide moisture resistance to keratin fibers such as hair. Thus, for example, keratin fibers that have been treated with the present invention to be straightened can be less frizzy and can exhibit good straightening for a long time even under humid or wet conditions such as those brought about by rain or sweat. Thus, for example, the present invention can provide good hair combability.

[0061] The present invention can provide a more durable reshaping effect for keratin fibers such as hair. Thus, the present invention can lengthen or extend the reshaping effect of keratin fibers provided by a composition containing only glyoxylic acid or its derivatives. In particular, the present invention can further maintain the straightened or curled shape of keratin fibers, or can prevent or reduce the loss of the straightened or curled shape of keratin fibers over time.

[0062] For example, if the keratin fibers are initially wavy, the present invention can provide better prevention for the keratin fibers from reverting to their original wavy shape after straightening the keratin fibers, especially after shampooing.

[0063] If the composition according to the present invention contains at least one betaine compound, the betaine compound can contribute to lengthening or extending the reshaping effect of keratin fibers provided by glyoxylic acid or its derivatives. In particular, the use of the betaine compound can contribute to maintaining the straightened or curled shape of keratin fibers provided by glyoxylic acid or its derivatives, or preventing or reducing the reversion of keratin fibers to their original shape.

[0064] The present invention can also provide a sufficient immediate reshaping effect for keratin fibers. For example, keratin fibers treated with the present invention to be straightened can have a smaller volume or less frizz due to the reduction in the curl of the keratin fibers. The reshaping effect provided by the present invention can last for a long time, for example, even after shampooing the keratin fibers. Thus, the present invention can also provide good shampoo resistance for the shape of keratin fibers.

[0065] Compared with conventional permanent reshaping methods, the present invention can provide less damage to keratin fibers because the present invention does not require the use of any reducing / oxidizing agents. Therefore, the keratin fibers treated by the present invention can be easily combed. Thus, the keratin fibers treated by the present invention are easy to manage. In addition, the keratin fibers treated by the present invention can be stronger than the keratin fibers treated by conventional permanent reshaping methods.

[0066] In addition, the present invention can be used without or with very little ammonia or thiol compounds, and thus, compared with conventional methods that require the use of ammonia or thiol compounds, the odor during the use of the present invention can be reduced. In addition, the present invention can have good usability, such as a short processing time.

[0067] Hereinafter, the present invention will be described in detail.

[0068] [Composition]

[0069] The composition according to the present invention comprises:

[0070] (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide and mixtures thereof; and

[0071] (b) at least one compound different from the compound of (a), which is selected from keto acids, their salts and mixtures thereof,

[0072] wherein

[0073] the amount of the compound of (a) in the composition is less than 15% by weight based on the total weight of the composition, and

[0074] the amount of the compound of (b) in the composition is 10% by weight or less.

[0075] Preferably, the composition according to the present invention is a cosmetic composition, more preferably a cosmetic composition for reshaping, such as a cosmetic composition for straightening keratin fibers, and even more preferably a cosmetic composition for one-step reshaping of keratin fibers, such as straightening. Particularly preferably, the keratin fibers are hair.

[0076] (Glyoxylic acid and its derivatives)

[0077] The composition according to the present invention comprises (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide and mixtures thereof.

[0078] A single type of the compound of (a) can be used, or two or more different types of the compound of (a) can be used in combination.

[0079] (a) The compound is selected from glyoxylic acid, glyoxylic acid solvates, glyoxylates, glyoxylates, glyoxamide and mixtures thereof. In other words, (a) the compound is selected from glyoxylic acid and its derivatives.

[0080] As glyoxylic acid solvates, mention may be made, for example, of glyoxylic acid hydrates, such as glyoxylic acid monohydrate.

[0081] As glyoxylates, mention may be made, for example, of alkali metal salts or alkaline earth metal salts of glyoxylic acid, such as sodium glyoxylate or potassium glyoxylate, and magnesium glyoxylate or calcium glyoxylate.

[0082] As glyoxylates, mention may be made, for example, of alkyl esters of glyoxylic acid, such as methyl glyoxylate and ethyl glyoxylate.

[0083] As glyoxamide, mention may be made, for example, of N-glyoxyyl carboxymethylcysteine and N-glyoxyyl keratin amino acids.

[0084] It is preferred to use glyoxylic acid as the (a) compound.

[0085] Based on the total weight of the composition, the amount of the (a) compound in the composition according to the invention may be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more.

[0086] Based on the total weight of the composition, the amount of the (a) compound in the composition according to the invention is less than 15% by weight, preferably less than 14% by weight, and more preferably less than 13% by weight.

[0087] Therefore, based on the total weight of the composition, the amount of the (a) compound in the composition according to the invention may be from 0.1% by weight to less than 15% by weight, preferably from 0.5% by weight to less than 14% by weight, and more preferably from 1% by weight to less than 13% by weight.

[0088] In one embodiment, based on the total weight of the composition, the amount of the (a) compound in the composition according to the invention may be 12% by weight or less, preferably 11% by weight or less, and more preferably 10% by weight or less.

[0089] Therefore, in this embodiment, based on the total weight of the composition, the amount of the (a) compound in the composition according to the invention may be from 0.1% by weight to 12% by weight, preferably from 0.5% by weight to 11% by weight, and more preferably from 1% by weight to 10% by weight.

[0090] In another embodiment, based on the total weight of the composition, the amount of the (a) compound in the composition according to the invention may be greater than 5% by weight, preferably greater than 6% by weight, and more preferably greater than 7% by weight.

[0091] Thus, in this embodiment, the amount of the compound (a) in the composition according to the present invention can be greater than 5% by weight and less than 15% by weight, preferably greater than 6% by weight and less than 14% by weight, and more preferably greater than 7% by weight and less than 13% by weight, based on the total weight of the composition, or greater than 5% by weight and 12% by weight or less, preferably greater than 6% by weight and 11% by weight or less, and more preferably greater than 7% by weight and 10% by weight or less, based on the total weight of the composition.

[0092] (keto acid)

[0093] The composition according to the present invention comprises (b) at least one compound different from the compound (a), selected from keto acids, their salts and mixtures thereof. Two or more compounds of (b) can be used in combination. Thus, a single type of compound of (b) or a combination of different types of compounds of (b) can be used.

[0094] The keto acid can be selected from α-keto acids, β-keto acids, γ-keto acids and mixtures thereof.

[0095] The α-keto acid can be a compound represented by the general formula (I):

[0096] R 1 -C(=O)-COOH (I)

[0097] wherein

[0098] R 1 represents a straight-chain or branched C1-C6 alkyl group, which is optionally substituted with OH, COOH or a halogen atom such as a chlorine or bromine atom.

[0099] Examples of the α-keto acid include pyruvic acid.

[0100] The β-keto acid can be represented by the general formula (II):

[0101] R 2 -C(=O)-R 3 -COOH (II)

[0102] wherein

[0103] R 2 represents a straight-chain or branched C1-C6 alkyl group, which is optionally substituted with OH, COOH or a halogen atom such as a chlorine or bromine atom; and

[0104] R 3 represents a methylene group, which is optionally substituted with a halogen atom such as a chlorine or bromine atom.

[0105] Examples of the β-keto acid include acetoacetic acid.

[0106] The γ-keto acid can be represented by the general formula (III):

[0107] R 2 -C(=O)-R 4 -COOH(III)

[0108] wherein

[0109] R 2 represents a straight-chain or branched C1-C6 alkyl group, which is optionally substituted by OH, COOH or a halogen atom such as a chlorine or bromine atom; and

[0110] R 4 represents an ethylene group, which is optionally substituted by a halogen atom such as a chlorine or bromine atom.

[0111] Examples of γ-keto acids include levulinic acid.

[0112] The salts of keto acids can be alkali metal salts or alkaline earth metal salts of keto acids, such as sodium salts or potassium salts of keto acids, and magnesium salts or calcium salts of keto acids.

[0113] As the compound (b), γ-keto acid is preferably used, and more preferably levulinic acid and / or its salts, such as sodium levulinate.

[0114] Based on the total weight of the composition, the amount of the compound (b) in the composition according to the present invention can be 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more.

[0115] Based on the total weight of the composition, the amount of the compound (b) in the composition according to the present invention is 10% by weight or less, preferably 8% by weight or less, and more preferably 6% by weight or less.

[0116] Therefore, based on the total weight of the composition, the amount of the compound (b) in the composition according to the present invention can be 0.1% by weight to 10% by weight, preferably 0.5% by weight to 8% by weight, and more preferably 1% by weight to 6% by weight.

[0117] In one embodiment, based on the total weight of the composition, the amount of the compound (b) in the composition according to the present invention can be 5% by weight or less, preferably 4% by weight or less, and more preferably 3% by weight or less.

[0118] Therefore, in this embodiment, based on the total weight of the composition, the amount of the compound (b) in the composition according to the present invention can be 0.1% by weight to 5% by weight, preferably 0.5% by weight to 4% by weight, and more preferably 1% by weight to 3% by weight.

[0119] In another embodiment, the amount of the compound (b) in the composition according to the present invention may be from 0.5% to 10% by weight, preferably from 1% to 5% by weight, and more preferably from 2% to 4% by weight, based on the total weight of the composition.

[0120] In another embodiment, the compound (b) may be present in the composition according to the present invention in an amount less than that of the compound (a). For example, the range of the weight ratio of the amount of the compound (a) to the amount of the compound (b) contained in the composition according to the present invention may be from 1:1 to 15:1, preferably from 1:1 to 10:1, and more preferably from 1:1 to 4:1.

[0121] (Water)

[0122] The composition according to the present invention may contain (c) water.

[0123] Therefore, if the composition according to the present invention contains (c) water, the composition according to the present invention is not anhydrous.

[0124] Based on the total weight of the composition, the amount of (c) water in the composition according to the present invention may be 20% by weight or more, preferably 30% by weight or more, and more preferably 40% by weight or more.

[0125] On the other hand, based on the total weight of the composition, the amount of (c) water in the composition according to the present invention may be 95% by weight or less, preferably 90% by weight or less, and more preferably 85% by weight or less.

[0126] Based on the total weight of the composition, the amount of (c) water in the composition according to the present invention may be from 20% to 95% by weight, preferably from 30% to 90% by weight, and more preferably from 40% to 85% by weight.

[0127] (Betaine compound)

[0128] The composition according to the present invention may contain (d) at least one betaine compound. A single type of (d) betaine compound may be used, or two or more different types of (d) betaine compounds may be used in combination.

[0129] The term "betaine compound" herein refers to an amphoteric compound having a positively charged cationic moiety and a negatively charged anionic moiety, wherein no hydrogen atom is bonded to the positively charged atom in the positively charged cationic moiety, and the positively charged cationic moiety may not be adjacent to the negatively charged anionic moiety.

[0130] For the purposes of the present invention, the (d) betaine compound is not a surfactant containing at least one hydrophilic moiety and at least one hydrophobic moiety herein.

[0131] (d) The positively charged cationic moiety in the betaine compound includes, but is not limited to, quaternary ammonium cations, phosphonium cations, and sulfonium cations. Preferably, the (d) betaine compound includes a quaternary ammonium cation as the positively charged cationic moiety.

[0132] (d) The negatively charged anionic moiety in the betaine compound includes, but is not limited to, carboxylate anions.

[0133] (d) The betaine compound can be selected from trimethylglycine, carnitine, L-proline betaine, or stachydrine and mixtures thereof, and can preferably be trimethylglycine.

[0134] Based on the total weight of the composition, the amount of the (d) betaine compound in the composition according to the present invention can be 0.01% by weight or more, preferably 0.05% by weight or more, and more preferably 0.1% by weight or more.

[0135] On the other hand, based on the total weight of the composition, the amount of the (d) betaine compound in the composition according to the present invention can be 15% by weight or less, preferably 10% by weight or less, and more preferably 5% by weight or less.

[0136] Based on the total weight of the composition, the amount of the (d) betaine compound in the composition according to the present invention can be from 0.01% by weight to 15% by weight, preferably from 0.05% by weight to 10% by weight, and more preferably from 0.1% by weight to 5% by weight.

[0137] (pH)

[0138] The composition according to the present invention can have a pH of 7 or lower, preferably 6 or lower, and more preferably 5 or lower, measured at 25°C.

[0139] The composition according to the present invention can have a pH of 3 or higher, measured at 25°C.

[0140] The composition according to the present invention can have a pH of from 3 to 7, preferably from 3 to 6, and more preferably from 3 to 5, measured at 25°C.

[0141] (Alkalizing agent)

[0142] The composition according to the present invention can contain at least one alkalizing agent. Two or more alkalizing agents can be used in combination. Thus, a single type of alkalizing agent or a combination of different types of alkalizing agents can be used.

[0143] The alkalizing agent is different from the (d) betaine compound.

[0144] Preferably, if (a) the compound or (b) the compound can act to lower the pH of the composition, the composition according to the invention comprises a base agent.

[0145] The base agent may be an inorganic base agent. Preferably, the base agent is non-volatile. Preferably, the inorganic base agent is selected from alkali metal hydroxides; alkaline earth metal hydroxides; and alkali metal phosphates and monohydrogen phosphates, such as sodium phosphate or monosodium phosphate.

[0146] As examples of inorganic alkali metal hydroxides, sodium hydroxide, lithium hydroxide and potassium hydroxide may be mentioned. As examples of alkaline earth metal hydroxides, calcium hydroxide and magnesium hydroxide may be mentioned. As inorganic base agents, sodium hydroxide and potassium hydroxide are preferred.

[0147] The base agent may be an organic base agent. Preferably, the organic base agent is selected from monoamines and diamines.

[0148] As examples of monoamines, alkanolamines may be mentioned, such as monoethanolamine, diethanolamine and triethanolamine containing 1 to 3 hydroxyalkyl (C1-C4) groups. In particular, the alkanolamine may be selected from monoethanolamine, diethanolamine, triethanolamine, monoisopropanolamine, diisopropanolamine, N,N-dimethylethanolamine, 2-amino-2-methyl-1-propanol, triisopropanolamine, 2-amino-2-methyl-1,3-propanediol, 3-amino-1,2-propanediol, 3-dimethylamino-1,2-propanediol and tris(hydroxymethyl)aminomethane.

[0149] The diamine may be described by the following structure (B):

[0150]

[0151] wherein W represents an alkylene group, such as a propylene group, which is optionally substituted by a hydroxyl group or a C1-C4 alkyl group, and R a , R b , R c and R d independently represent a hydrogen atom, an alkyl group or a C1-C4 hydroxyalkyl group, and 1,3-propanediamine and its derivatives may be taken as examples.

[0152] Based on the total weight of the composition, the amount of the base agent in the composition according to the invention may be 0.01% by weight or more, preferably 0.05% by weight or more, and more preferably 0.1% by weight or more.

[0153] On the other hand, based on the total weight of the composition, the amount of the base agent in the composition according to the invention may be 15% by weight or less, preferably 10% by weight or less, and more preferably 5% by weight or less.

[0154] Thus, based on the total weight of the composition, the amount of the base agent in the composition according to the present invention can be from 0.01% to 15% by weight, preferably from 0.05% to 10% by weight, and more preferably from 0.1% to 5% by weight.

[0155] (acid)

[0156] The composition according to the present invention may comprise at least one acid different from the compound (a) or the compound (b) (and, if present, the betaine compound (d)). Two or more acids can be used in combination. Thus, a single type of acid or a combination of different types of acids can be used.

[0157] Acids can be used to adjust the pH of the composition according to the present invention.

[0158] As acids, any inorganic or organic acids commonly used in cosmetics can be mentioned, such as citric acid, lactic acid, sulfuric acid, phosphoric acid or hydrochloric acid (HCl). HCl is preferred.

[0159] Based on the total weight of the composition, the amount of the acid in the composition according to the present invention can be 0.01% by weight or more, preferably 0.05% by weight or more, and more preferably 0.1% by weight or more.

[0160] On the other hand, based on the total weight of the composition, the amount of the acid in the composition according to the present invention can be 15% by weight or less, preferably 10% by weight or less, and more preferably 5% by weight or less.

[0161] Thus, based on the total weight of the composition, the amount of the acid in the composition according to the present invention can be from 0.01% to 15% by weight, preferably from 0.05% to 10% by weight, and more preferably from 0.1% to 5% by weight.

[0162] (Other optional ingredients)

[0163] The composition according to the present invention may further comprise at least one other optional ingredient, which is particularly selected from: oils in liquid form at 25 °C and at atmospheric pressure, preferably polar oils, and more preferably ester oils; solid fatty substances at 25 °C and at atmospheric pressure, and in particular C8-C 40 esters, C8-C 40 acids and C8-C 40Alcohols; thickeners; sunscreen agents; humectants; antidandruff agents; antioxidants; antibacterial agents such as benzoic acid; preservatives such as phenoxyethanol; chelating agents; pearlescent agents and opacifiers; plasticizers or coalescing agents; fillers; emulsifiers; polymers, especially conditioning polymers such as cationic polymers; fragrances; silanes; crosslinking agents; and surfactants, including anionic surfactants, amphoteric surfactants and nonionic surfactants. Of course, the composition may contain a variety of cosmetic ingredients that appear in the above list.

[0164] The composition according to the invention may contain one or more cosmetically acceptable organic solvents, which may be alcohols: especially monohydric alcohols such as ethanol, isopropanol, benzyl alcohol and phenethyl alcohol; diols such as ethylene glycol, propylene glycol and octylene glycol; other polyhydric alcohols such as glycerol; and ethers such as ethylene glycol monomethyl ether, ethylene glycol monoethyl ether and ethylene glycol monobutyl ether, propylene glycol monomethyl ether, propylene glycol monoethyl ether and propylene glycol monobutyl ether, and butylene glycol monomethyl ether, butylene glycol monoethyl ether and butylene glycol monobutyl ether.

[0165] Depending on their nature and the use of the composition, the above optional ingredients may be present in normal amounts that can be readily determined by those skilled in the art, and for each ingredient, it may be between 0.01% by weight and 80% by weight. Those skilled in the art will carefully select the ingredients and their amounts included in the composition such that they do not impair the properties of the composition for the present invention.

[0166] (Ammonia and thiol compounds)

[0167] Preferably, the composition according to the invention is free of ammonia or thiol compounds. The term "free of ammonia or thiol compounds" means that the composition according to the invention does not contain a significant amount of ammonia or thiol compounds. Preferably, the composition according to the invention contains 1% by weight or less, more preferably 0.5% by weight or less, and even more preferably 0.1% by weight or less of ammonia or thiol compounds, especially free of ammonia or thiol compounds.

[0168] Due to the very small amount or absence of ammonia and / or thiol compounds, malodors during the use of the composition according to the invention can be reduced or prevented.

[0169] Thiol compounds herein refer to compounds having at least one thiol (-SH) group.

[0170] The mercapto compound can be a reducing agent. The mercapto reducing agent can be selected from mercaptoacetic acid and its derivatives, especially its esters, such as glycerol or glycol monomercaptoacetate; thiolactic acid and its derivatives, especially its esters, such as glycerol monothiolactate; 3-mercaptopropionic acid and its derivatives, especially its esters, such as glycerol 3-mercaptopropionate and ethylene glycol 3-mercaptopropionate; cysteamine and its derivatives, especially its C1-C4 acyl derivatives, such as N-acetylcysteamine and N-propionylcysteamine; monothioglycerol and its derivatives, especially esters; cysteine and its derivatives, especially esters, such as N-acetylcysteine, N-alkanoyl cysteine and cysteine alkyl esters; thioglycerol and its derivatives, especially S-alkyl derivatives; and their salts.

[0171] As the above salts, for example, ammonium salts; primary, secondary or tertiary amine salts; alkali metal salts; and alkaline earth metal salts can be mentioned. As the primary, secondary or tertiary amines, for example, monoethanolamine, diisopropanolamine or triethanolamine can be mentioned respectively.

[0172] Other examples of mercapto reducing agents include, but are not limited to, sugar N-mercaptoalkylamides, such as N-(mercapto-2-ethyl)glucosamide, β-mercaptopropionic acid and its derivatives; thiomalic acid; pantheteine; N-(mercaptoalkyl)ω-hydroxyalkylamides, such as those described in European Patent Application No. 0 354 835, and N-mono- or N,N-dialkylmercapto 4-butyramides, such as those described in European Patent Application No. 0 368 763; amino mercaptoalkylamides, such as those described in European Patent Application No. 0 432 000, and alkylamino mercaptoalkylamides, such as those described in European Patent Application No. 0 514 282; mercaptoacetic acid (2 / 3) hydroxy-2-propyl ester; and a mixture (67 / 33) based on mercaptoacetic acid hydroxy-2-methyl-1-ethyl ester described in French Patent Application No. 2 679 448.

[0173] (Reducing agent and oxidizing agent)

[0174] The composition according to the invention can contain a reducing agent; however, preferably, the composition according to the invention contains a reduced amount of a reducing agent or an oxidizing agent, preferably without a reducing agent or an oxidizing agent.

[0175] The term "without a reducing agent or an oxidizing agent" means that the composition according to the invention does not contain a significant amount of a reducing agent or an oxidizing agent. Preferably, the composition according to the invention contains 1% by weight or less, more preferably 0.5% by weight or less, and even more preferably 0.1% by weight or less of a reducing agent or an oxidizing agent, especially without a reducing agent or without an oxidizing agent.

[0176] The reducing agent can be a mercapto reducing agent or a non-mercapto reducing agent. The mercapto reducing agent is as described above.

[0177] A non-thiol reducing agent herein refers to a reducing agent without a thiol group. The non-thiol reducing agent can be selected from sulfites, bisulfites, sulfinates, phosphines, sugars, reductones, and hydrides. The non-thiol reducing agent can be selected from ammonium sulfite and ammonium bisulfite, as well as metal sulfites and bisulfites, more preferably alkali metal or alkaline earth metal sulfites and bisulfites, and even more preferably sodium sulfite and sodium bisulfite.

[0178] The oxidizing agent can be selected from hydrogen peroxide, alkali metal bromates, ferricyanide peroxysalts, and compounds capable of generating hydrogen peroxide by hydrolysis. For example, the oxidizing agent can be selected from aqueous hydrogen peroxide solutions, urea peroxide, alkali metal bromates, and persalts such as perborates and persulfates.

[0179] (Form)

[0180] The composition for use in the present invention can be in any form suitable for topical application, and in particular the following forms: aqueous, alcoholic, or water-alcoholic or oily solutions or suspensions; solutions or dispersions of the lotion or serum type; emulsions of the O / W, W / O, or multiple type, especially emulsions of liquid or semi-liquid consistency (if the composition according to the present invention includes at least one oil); creams (O / W) or (W / O) type suspensions or emulsions of soft consistency; aqueous gels; or any other cosmetic form.

[0181] The composition for use in the present invention can be in any galenical form. For example, the composition for use in the present invention can be in the form commonly used for any hair treatment, such as creams, lotions, gels, etc.

[0182] The composition according to the present invention can be used for treating, preferably reshaping, and even more preferably straightening keratin fibers such as hair.

[0183] [Method]

[0184] The present invention also relates to a method for reshaping, preferably straightening, keratin fibers such as hair, which comprises the steps of:

[0185] (i) applying the composition according to the present invention to the keratin fibers;

[0186] (ii) optionally rinsing the keratin fibers and drying or not drying the keratin fibers after rinsing; and

[0187] (iii) preferably reshaping, preferably straightening, the keratin fibers at a temperature greater than 50 °C, more preferably greater than 100 °C, and even more preferably greater than 150 °C.

[0188] Details of the composition used in the method according to the invention are explained in the section above entitled [Composition].

[0189] The method according to the invention is for reshaping, preferably straightening keratin fibers such as hair, more preferably for long-term straightening, and even more preferably for straightening even after multiple washings with shampoo. In this sense, the method according to the invention can be a semi-permanent reshaping (preferably straightening) method.

[0190] Preferably, the keratin fibers are cleaned before step (i). This cleaning step can be carried out, for example, by washing the keratin fibers with shampoo and then rinsing the keratin fibers. After rinsing, the keratin fibers can be dried. Preferably, the keratin fibers are wet just before step (i) is to be carried out.

[0191] In step (i), the composition according to the invention explained above is applied to keratin fibers such as hair. The application of the composition according to the invention can be carried out by any means, such as a brush or a comb.

[0192] The bath ratio of the applied composition according to the invention to the keratin fibers can range from 0.1 to 10, more particularly from 0.5 to 5, and preferably between 0.3 and 2. The term "bath ratio" is intended to represent the weight ratio between the total weight of the applied composition and the total weight of the keratin fibers.

[0193] It is possible that after applying the composition according to the invention, the keratin fibers are left as they are for a certain amount of time; usually from 1 minute to 1 hour, preferably from 2 to 30 minutes, and more preferably from 3 to 10 minutes if necessary, so that the composition penetrates into the keratin fibers.

[0194] After step (i), the method according to the invention can comprise an optional step (ii): rinsing the keratin fibers and drying or not drying the keratin fibers after rinsing.

[0195] Thus, if step (ii) is present, the keratin fibers are rinsed to remove the composition according to the invention from the keratin fibers. The rinsing step can be carried out with water. Preferably, the keratin fibers are dried after rinsing. Drying of the keratin fibers can be carried out with a conventional drying tool such as a hair dryer.

[0196] On the other hand, if step (ii) is not present, the keratin fibers can be processed in step (iii) without rinsing after step (i).

[0197] In step (iii), the preferably dry keratin fibers are reshaped, preferably straightened, using a heater, such as a hair straightening iron and a hair curler, at a temperature preferably greater than 50 °C, more preferably greater than 100 °C, and even more preferably greater than 150 °C. This temperature can be less than 250 °C, preferably less than 240 °C, and more preferably less than 230 °C. Thus, this temperature can be greater than 50 °C and less than 250 °C, preferably greater than 100 °C and less than 240 °C, and more preferably greater than 150 °C and less than 230 °C.

[0198] Reshaping can be carried out by applying any mechanical force, such as mechanical tension, to the keratin fibers. Mechanical force can be applied to the keratin fibers by any reshaping tool to deform the keratin fibers into the desired shape. For example, the mechanical force can be provided by at least one reshaping tool selected from at least one hair straightening iron, at least one hair curler, at least one comb, and combinations thereof. Any conventional hair straightening iron, hair curler, or comb can be used as the reshaping tool. A dryer that can blow a gas, such as air, can also be used as the reshaping tool.

[0199] The reshaping tool can comprise at least one heater. Thus, the reshaping tool can be at least one hair straightening iron and / or at least one hair curler and / or at least one heated comb and / or at least one heated dryer that can blow hot gas, such as hot air. At least one hair straightening iron and / or at least one hair curler can be preferably used.

[0200] As the hair straightening iron, any conventional hair straightening iron can be used. The hair straightening iron can have at least one plate, preferably two plates, which can be heated, for example, by electricity. The heated plates can be applied to the keratin fibers and moved along the direction of the keratin fibers to straighten them.

[0201] Preferably, the hair straightening iron has two plates, and the keratin fibers are sandwiched between the two plates of the hair straightening iron, where at least one plate can be heated, and then the two plates are moved along the direction of the keratin fibers to straighten them.

[0202] Preferably, the hair straightening iron, particularly the part thereof in contact with the keratin fibers, such as the heated plates, has a temperature greater than 50 °C and less than 250 °C, more preferably greater than 100 °C and less than 240 °C, and even more preferably greater than 150 °C and less than 230 °C.

[0203] Step (iii) can be carried out by moving the hair straightening iron along the direction of the keratin fibers for one or more strokes. Step (iii) can be controlled not only by the temperature of the hair straightening iron but also by the number of strokes of the hair straightening iron.

[0204] The heating time can depend on the temperature of the heating plates, but also on the number of strokes of the heating plates. It can be, for example, from 1 second to 10 minutes, and preferably from a few seconds to 5 minutes.

[0205] As a heated hair curler, any conventional heated hair curler can be used. If the keratin fibers are wound around the heated hair curler, such winding can be carried out over the entire length of the keratin fibers, or, for example, over half the length of the keratin fibers. Depending on, for example, the desired hairstyle shape and amount of curling, the winding can be carried out with more or less thick strands of hair.

[0206] Preferably, the heated hair curler, in particular the part thereof in contact with the keratin fibers, such as the heating rod and the heating cover, has a temperature greater than 50 °C and less than 250 °C, more preferably greater than 100 °C and less than 240 °C, and even more preferably greater than 150 °C and less than 230 °C.

[0207] Step (iii) can be carried out by holding the keratin fibers on the heated hair curler so as to apply a mechanical tension to the keratin fibers. Step (iii) can be controlled not only by the temperature of the heated hair curler, but also by the intensity of the mechanical tension.

[0208] The heating time can depend on the temperature of the heated hair curler, but also on the intensity of the mechanical tension. It can be, for example, from 1 second to 10 minutes, and preferably from a few seconds to 5 minutes.

[0209] If necessary, before step (ii), a mechanical tension can be applied to the keratin fibers as explained above.

[0210] [Kit]

[0211] The invention also relates to a kit for reshaping, preferably straightening, keratin fibers such as hair, comprising:

[0212] At least one selected from the group consisting of hair straighteners, hair curlers, combs, hair dryers and combinations thereof, preferably at least one heated hair straightener, heated hair curler, heated comb or heated hair dryer, which is capable of providing a temperature greater than 50 °C, preferably greater than 100 °C, and more preferably greater than 150 °C to the keratin fibers; and

[0213] A composition according to the invention.

[0214] Any conventional hair straightener or hair curler, including any conventional heated hair straightener or heated hair curler, can be used as the above-mentioned hair straightener or hair curler in the kit according to the invention.

[0215] The hair straightener or hair curler in the kit according to the invention is not limited, as long as it can heat keratin fibers at a temperature greater than 50 °C, preferably greater than 100 °C, and more preferably greater than 150 °C. This temperature can be less than 250 °C, preferably less than 240 °C, and more preferably less than 230 °C. Thus, this temperature can be greater than 50 °C and less than 250 °C, preferably greater than 100 °C and less than 240 °C, and more preferably greater than 150 °C and less than 230 °C.

[0216] The straightener or curler and the composition in the kit according to the invention can be used as explained in the section titled [Method] above.

[0217] The details of the composition used in the kit according to the invention are explained in the section titled [Composition] above.

[0218] [Use]

[0219] The present invention may relate to

[0220] (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvate, glyoxylate, glyoxylate ester, glyoxamide and mixtures thereof; and

[0221] (b) at least one compound different from the compound of (a), which is selected from keto acids, their salts and mixtures thereof,

[0222] in a composition for preferably reshaping, preferably straightening keratin fibers such as hair under heating, wherein

[0223] the amount of the compound of (a) in the composition is less than 15% by weight relative to the total weight of the composition, and

[0224] the amount of the compound of (b) in the composition is 10% by weight or less,

[0225] thereby providing good texture, strength and moisture resistance for keratin fibers such as hair treated with the composition,

[0226] and / or

[0227] thereby prolonging the reshaping effect of keratin fibers treated with the composition, in particular thereby further maintaining the straight shape of keratin fibers, or preventing or reducing the curling of keratin fibers.

[0228] Heating is not restricted as long as it can heat the keratin fibers at a temperature greater than 50 °C, preferably greater than 100 °C, and more preferably greater than 150 °C. This temperature can be less than 250 °C, preferably less than 240 °C, and more preferably less than 230 °C. Thus, this temperature can be greater than 50 °C and less than 250 °C, preferably greater than 100 °C and less than 240 °C, and more preferably greater than 150 °C and less than 230 °C.

[0229] The above composition may further comprise (c) water and / or (d) at least one betaine compound.

[0230] The above explanations regarding the (a) compound, (b) compound, (c) water, and (d) betaine compound are applicable to those in the above composition for use according to the invention. Examples

[0231] The present invention will be described in more detail by way of examples. However, these examples should not be construed as limiting the scope of the present invention.

[0232] Example 1 and Comparative Examples 1-4

[0233] [Preparation]

[0234] The respective compositions according to Example 1 and Comparative Examples 1-4 were prepared by mixing the ingredients shown in Table 1. The numerical values of the amounts of the ingredients are all based on "wt%" as the raw materials.

[0235] Table 1

[0236]

[0237] AM: Active material

[0238] (1) Sold by WEYLCHEM under the name GLYOXO-HIGH PURE 50 (containing 50% active material).

[0239] (2) Sold by DR STRAETMANS (EVONIK) under the name DERMOSOFT 700B (containing 60% active material).

[0240] [Evaluation]

[0241] (Texture)

[0242] The respective compositions according to Example 1 and Comparative Examples 1-4 were used to treat hair samples (1.0 g, 27 cm) according to the following steps.

[0243] 1. Wash the hair samples with shampoo and rinse with water.

[0244] 2. After rinsing, apply 1 g of the composition to be evaluated to the wet hair sample within 1 minute.

[0245] 3. Let the hair sample stand at room temperature (25 °C) for 10 minutes.

[0246] 4. Thoroughly rinse the hair sample with tap water.

[0247] 5. Dry the hair sample with a hair dryer.

[0248] Immediately after drying the hair sample, the "moisture feeling" of the hair sample was evaluated by the panel members based on the following criteria relative to the reference (treated with the composition according to Comparative Example 1). The higher the score, the better the moisture feeling of the hair.

[0249] 5: Very good

[0250] 4: Good

[0251] 3: Comparable to the reference (hair sample treated with water: Comparative Example 1)

[0252] 2: Poor

[0253] 1: Very poor

[0254] The results are shown in the "Texture" row in Table 1.

[0255] Obviously, the composition according to Example 1 provides a better texture (better moisture feeling) than the compositions according to Comparative Examples 1-4.

[0256] Comparative Examples 1-4 show that using only glyoxylic acid (Comparative Example 2), using 15 wt% or more of glyoxylic acid (Comparative Example 3), or using more than 10 wt% of levulinic acid (18.2 * 0.6 = 10.92 wt%) cannot improve the texture of the hair sample.

[0257] (Flexural resistance)

[0258] Each composition according to Example 1 and Comparative Examples 1-4 was used to treat hair samples (1.0 g, 27 cm) according to the following steps.

[0259] 1. Wash the hair sample with shampoo and rinse with water.

[0260] 2. After rinsing, apply 1 g of the composition to be evaluated to the wet hair sample within 1 minute.

[0261] 3. Let the hair sample stand at room temperature (25 °C) for 10 minutes.

[0262] 4. Thoroughly rinse the hair sample with tap water.

[0263] 5. Dry the hair sample with a hair dryer.

[0264] Fix the root of the hair sample to the plate. On the other hand, hold the tip of the hair sample and orient it upward, and then release the tip of the hair sample so that the tip of the hair sample can be oriented downward. Measure the angle between the plate and the root of the hair sample (hair bundle) (see Figure 1 ). Determine the average value as the bending angle.

[0265] The bending angle is shown in the "anti-bending property" row in Table 1. The higher the bending angle, the more elastic the hair.

[0266] Obviously, the composition according to Example 1 provides greater anti-bending property (greater strength) than the compositions according to Comparative Examples 1-4.

[0267] Comparative Examples 1-4 show that using only glyoxylic acid (Comparative Example 2), using 15 wt% or more of glyoxylic acid (Comparative Example 3), or using more than 10 wt% of levulinic acid (18.2 * 0.6 = 10.92 wt%) cannot sufficiently improve the strength of the hair sample.

[0268] Example 2 and Comparative Examples 5-8

[0269] [Preparation]

[0270] Prepare each composition according to Example 2 and Comparative Examples 5-8 by mixing the ingredients shown in Table 2. The numerical values of the amounts of the ingredients are all based on "wt%" as the raw materials.

[0271] Table 2

[0272]

[0273] AM: Active material

[0274] (1) Sold by WEYLCHEM under the name GLYOXO-HIGH PURE 50 (contains 50% active material).

[0275] (2) Sold by DR STRAETMANS (EVONIK) under the name DERMOSOFT700B (contains 60% active material).

[0276] [Evaluation]

[0277] (Shape transformation speed)

[0278] Each composition according to Example 2 and Comparative Examples 5-8 is used to treat a hair sample (1.0 g, 27 cm) according to the following steps.

[0279] 1. Wash the hair sample with shampoo and rinse with water.

[0280] 2. After rinsing, 0.6 grams of the composition to be evaluated is applied to the wet hair sample within 1 minute.

[0281] 3. The hair sample is left standing at room temperature (25 °C) for 10 minutes.

[0282] 4. The hair sample is thoroughly rinsed with tap water.

[0283] 5. The hair sample is dried with a hair dryer.

[0284] 6. The hair sample is subjected to straightening 3 strokes at 180 °C at 4 seconds / stroke using a hair straightening iron (ADST Premium DS2, Hakko Limited, Japan).

[0285] 7. The hair sample is placed in an oven at 50 °C for 30 minutes for standardization.

[0286] 8. The hair sample is placed in a controlled chamber (ETS environmental test chamber, model 5532-1-30-2262) at a temperature of 30 °C and an atmospheric humidity of 70% for 1 hour.

[0287] 9. A video of the hair sample is taken during step 8.

[0288] The shape transformation speed of the hair sample is evaluated based on the following criteria through the video taken in step 9. The higher the score, the better the moisture resistance.

[0289] 5: Slow

[0290] 4: Somewhat slow

[0291] 3: Normal

[0292] 2: Somewhat fast

[0293] 1: Fast

[0294] The results are shown in the "Shape transformation speed" row in Table 2.

[0295] Obviously, the composition according to Example 2 provides a slower shape transformation speed (i.e., the hair takes more time to change its shape) than the compositions according to Comparative Examples 5-8. This means that the composition according to Example 2 provides greater moisture resistance than the compositions according to Comparative Examples 5-8.

[0296] In particular, Comparative Examples 7 and 8 show that using only glyoxylic acid (Comparative Example 7) or only levulinic acid / sodium levulinate cannot improve the moisture resistance as fully as the composition according to Example 2.

[0297] (Frizzy)

[0298] The compositions of Example 2 and Comparative Examples 5 - 8 were used to treat hair samples (1.0 g, 27 cm) according to the following steps.

[0299] 1. Wash the hair samples with shampoo and rinse with water.

[0300] 2. After rinsing, apply 0.6 g of the composition to be evaluated to the wet hair samples within 1 minute.

[0301] 3. Let the hair samples stand at room temperature (25 °C) for 10 minutes.

[0302] 4. Thoroughly rinse the hair samples with tap water.

[0303] 5. Dry the hair samples with a hair dryer.

[0304] 6. Subject the hair samples to straightening 3 passes at 180 °C at 4 seconds per pass using a hair straightener (ADST Premium DS2, Hakko Limited, Japan).

[0305] 7. Place the hair samples in an oven at 50 °C for 30 minutes for standardization.

[0306] 8. Take a photo of the hair samples immediately after step 7.

[0307] 9. Place the hair samples in a controlled chamber (ETS environmental test chamber, model 5532 - 1 - 30 - 2262) at a temperature of 30 °C and an atmospheric humidity of 70% for 1 hour.

[0308] 10. Take a photo of the hair samples immediately after step 9.

[0309] By comparing the photos taken in steps 8 and 10, evaluate the frizz of the hair samples according to the following criteria. The higher the score, the better the moisture resistance.

[0310] 5: Very good (no frizz)

[0311] 4: Good (less frizz)

[0312] 3: Fair (a little frizz)

[0313] 2: Poor (some frizz)

[0314] 1: Very poor (a lot of frizz)

[0315] The results are shown in the "Frizz" row of Table 2.

[0316] Obviously, the composition according to Example 2 provides less frizz under humid conditions than the compositions according to Comparative Examples 5-8. This means that the composition according to Example 2 provides greater humidity resistance than the compositions according to Comparative Examples 5-8.

[0317] In particular, Comparative Examples 7 and 8 show that using only glyoxylic acid (Comparative Example 7) or only levulinic acid / sodium levulinate cannot inhibit frizz as well as the composition according to Example 2.

[0318] (Collimation)

[0319] Each composition according to Example 2 and Comparative Examples 5-8 was used to treat hair samples (1.0 g, 27 cm) according to the following steps.

[0320] 1. Wash the hair sample with shampoo and rinse with water.

[0321] 2. After rinsing, apply 0.6 g of the composition to be evaluated to the wet hair sample within 1 minute.

[0322] 3. Let the hair sample stand at room temperature (25 °C) for 10 minutes.

[0323] 4. Thoroughly rinse the hair sample with tap water.

[0324] 5. Dry the hair sample with a hair dryer.

[0325] 6. Subject the hair sample to straightening 3 strokes at 180 °C for 4 seconds / stroke using a hair straightener (ADST Premium DS2, Hakko Limited, Japan).

[0326] 7. Place the hair sample in an oven at 50 °C for 30 minutes for standardization.

[0327] 8. Take a photo of the hair sample immediately after step 7.

[0328] 9. Place the hair sample in a controlled chamber (ETS environmental test chamber, model 5532-1-30-2262) at a temperature of 30 °C and an atmospheric humidity of 70% for 1 hour.

[0329] 10. Take a photo of the hair sample immediately after step 9.

[0330] By comparing the photos taken in steps 8 and 10, the straightening of the hair sample was evaluated according to the following criteria. The higher the score, the better the humidity resistance.

[0331] 5: Very good

[0332] 4: Good

[0333] 3: Fair

[0334] 2: Poor

[0335] 1: Very poor

[0336] The results are shown in the "Collimation" row of Table 2.

[0337] Obviously, the composition according to Example 2 provides better hair collimation under humid conditions than the compositions according to Comparative Examples 5 - 8. This means that the composition according to Example 2 provides greater moisture resistance than the compositions according to Comparative Examples 5 - 8.

[0338] In particular, Comparative Examples 7 and 8 show that using only glyoxylic acid (Comparative Example 7) or only levulinic acid / sodium levulinate cannot provide good hair collimation like the composition according to Example 2.

Claims

1. A composition for keratin fibers such as hair, comprising: (a) at least one compound selected from glyoxylic acid, glyoxylic acid solvates, glyoxylates, glyoxylates, glyoxylamides, and mixtures thereof; and (b) at least one compound different from the compound of (a), which is selected from keto acids, their salts, and mixtures thereof, wherein the amount of the compound of (a) in the composition is less than 15% by weight relative to the total weight of the composition, and the amount of the compound of (b) in the composition is 10% by weight or less.

2. The composition according to claim 1, wherein the amount of the compound of (a) in the composition is 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more, relative to the total weight of the composition.

3. The composition according to claim 1 or 2, wherein the compound of (b) is selected from levulinic acid, its salts, and mixtures thereof.

4. The composition according to any one of claims 1 to 3, wherein the amount of the compound of (b) in the composition is 0.1% by weight or more, preferably 0.5% by weight or more, and more preferably 1% by weight or more, relative to the total weight of the composition.

5. The composition according to any one of claims 1 to 4, wherein the composition further comprises (c) water.

6. The composition according to claim 5, wherein the amount of the (c) water in the composition is 20% to 95% by weight, preferably 30% to 90% by weight, and more preferably 40% to 85% by weight, relative to the total weight of the composition.

7. The composition according to any one of claims 1 to 6, wherein the composition further comprises (d) at least one betaine compound.

8. The composition according to claim 7, wherein the (d) betaine compound is selected from trimethylglycine, carnitine, and L-proline betaine or stachydrine and mixtures thereof.

9. The composition according to claim 7 or 8, wherein the amount of the (d) betaine compound in the composition is 0.01% to 15% by weight, preferably 0.05% to 10% by weight, and more preferably 0.1% to 5% by weight, relative to the total weight of the composition.

10. The composition according to any one of claims 1 to 9, wherein the pH of the composition is 7 or lower, preferably 6 or lower, and more preferably 5 or lower.

11. The composition according to any one of claims 1 to 10, wherein the composition does not contain any ammonia or thiol compounds, or contains less than 1% by weight, preferably less than 0.5% by weight, and more preferably less than 0.1% by weight of ammonia or thiol compounds relative to the total weight of the composition.

12. The composition according to any one of claims 1 to 11, wherein the composition does not contain any reducing agent or oxidizing agent, or contains less than 1% by weight, preferably less than 0.5% by weight, and more preferably less than 0.1% by weight of reducing agent or oxidizing agent relative to the total weight of the composition.

13. A composition according to any one of claims 1 to 12, which is intended for reshaping, preferably straightening keratin fibers, such as hair.

14. A method for reshaping, preferably straightening keratin fibers such as hair, comprising the steps of: (i) applying a composition according to any one of claims 1 to 13 to the keratin fibers; (ii) optionally rinsing the keratin fibers and drying or not drying the keratin fibers after rinsing; and (iii) reshaping, preferably straightening the keratin fibers, preferably at a temperature greater than 50 °C, more preferably greater than 100 °C, and even more preferably greater than 150 °C.

15. A kit for reshaping, preferably straightening keratin fibers such as hair, comprising: at least one selected from the group consisting of an iron, a curling iron, a comb, a hair dryer, and combinations thereof, preferably at least one heating iron, a heating curling iron, a heating comb, or a heating hair dryer, which is capable of providing a temperature greater than 50 °C, preferably greater than 100 °C, and more preferably greater than 150 °C to the keratin fibers; and a composition according to any one of claims 1 to 13.

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