US20100300471A1 - Method for straightening keratinous fibers using heating means and an acid derivative - Google Patents
Method for straightening keratinous fibers using heating means and an acid derivative Download PDFInfo
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- US20100300471A1 US20100300471A1 US12/301,840 US30184007A US2010300471A1 US 20100300471 A1 US20100300471 A1 US 20100300471A1 US 30184007 A US30184007 A US 30184007A US 2010300471 A1 US2010300471 A1 US 2010300471A1
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- hair
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- 0 *C(=O)C([1*])([2*])O Chemical compound *C(=O)C([1*])([2*])O 0.000 description 5
- XLSZMDLNRCVEIJ-UHFFFAOYSA-N CC1=CNC=N1 Chemical compound CC1=CNC=N1 XLSZMDLNRCVEIJ-UHFFFAOYSA-N 0.000 description 4
- FEWFXBUNENSNBQ-UHFFFAOYSA-N C=C(O)C(=O)O Chemical compound C=C(O)C(=O)O FEWFXBUNENSNBQ-UHFFFAOYSA-N 0.000 description 2
- VIYHCYJLAWALFL-UHFFFAOYSA-M C.C.C=C(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.S.[H]C(CSSCC([H])(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C)(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(C[S-])(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[OH-] Chemical compound C.C.C=C(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.S.[H]C(CSSCC([H])(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C)(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(C[S-])(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[OH-] VIYHCYJLAWALFL-UHFFFAOYSA-M 0.000 description 1
- AWZNTKNBFNVDDW-UHFFFAOYSA-M C=C(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(CC)(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(CS)(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(C[S-])(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C Chemical compound C=C(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(CC)(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(CS)(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C.[H]C(C[S-])(NC(=O)C(C)(C)C)C(=O)NC(C)(C)C AWZNTKNBFNVDDW-UHFFFAOYSA-M 0.000 description 1
Classifications
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D7/00—Processes of waving, straightening or curling hair
- A45D7/06—Processes of waving, straightening or curling hair combined chemical and thermal
-
- A—HUMAN NECESSITIES
- A45—HAND OR TRAVELLING ARTICLES
- A45D—HAIRDRESSING OR SHAVING EQUIPMENT; EQUIPMENT FOR COSMETICS OR COSMETIC TREATMENTS, e.g. FOR MANICURING OR PEDICURING
- A45D2/00—Hair-curling or hair-waving appliances ; Appliances for hair dressing treatment not otherwise provided for
- A45D2/001—Hair straightening appliances
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/36—Carboxylic acids; Salts or anhydrides thereof
- A61K8/362—Polycarboxylic acids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/30—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds
- A61K8/33—Cosmetics or similar toiletry preparations characterised by the composition containing organic compounds containing oxygen
- A61K8/36—Carboxylic acids; Salts or anhydrides thereof
- A61K8/365—Hydroxycarboxylic acids; Ketocarboxylic acids
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K8/00—Cosmetics or similar toiletry preparations
- A61K8/18—Cosmetics or similar toiletry preparations characterised by the composition
- A61K8/72—Cosmetics or similar toiletry preparations characterised by the composition containing organic macromolecular compounds
- A61K8/73—Polysaccharides
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61Q—SPECIFIC USE OF COSMETICS OR SIMILAR TOILETRY PREPARATIONS
- A61Q5/00—Preparations for care of the hair
- A61Q5/04—Preparations for permanent waving or straightening the hair
-
- A—HUMAN NECESSITIES
- A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
- A61K—PREPARATIONS FOR MEDICAL, DENTAL OR TOILETRY PURPOSES
- A61K2800/00—Properties of cosmetic compositions or active ingredients thereof or formulation aids used therein and process related aspects
- A61K2800/20—Chemical, physico-chemical or functional or structural properties of the composition as a whole
- A61K2800/24—Thermal properties
Definitions
- the invention relates to a process for relaxing keratin fibres with a heating means and at least one ⁇ -hydroxy acid and/or keto acid derivative.
- the relaxing process according to the invention is performed without using any reducing agent or lanthionizing agent. It does not include any reducing or lanthionization step.
- keratin fibres means fibres of human or animal origin such as head hair, bodily hair, the eyelashes, wool, angora, cashmere or fur. Although the invention is not limited to particular keratin fibres, reference will nevertheless be made more particularly to head hair.
- the term “relaxing” covers the relaxing, straightening or uncurling of Caucasian or African hair.
- heating means means any means for heating keratin fibres to a temperature of at least 110° C., such as heating irons, for example flat or round irons, microwave generators or sources of infrared radiation.
- this lanthionization technique does not require a fixing step, since the formation of the lanthionine bridges is irreversible. It is thus performed in a single step and makes it possible either to make the hair wavy, or to relax it, uncurl or straighten it out. However, it is mainly used for relaxing naturally curly hair.
- the reducing compositions generally used for the first step of a permanent-waving or hair-relaxing operation contain thiols, sulfites or bisulfites as reducing agent. These agents are generally used in essentially aqueous medium at concentrations of between 0.5 and 1 M to obtain good opening of the disulfide bonds.
- thiols those commonly used are thioglycolic acid, cysteamine, glyceryl monothioglycolate, thiolactic acid and cysteine.
- Thioglycolic acid is particularly efficient at reducing the disulfide bonds of keratin at alkaline pH, especially in the form of ammonium thioglycolate, and constitutes the product most frequently used in permanent waving (“hair waving”). It has been found, however, that thioglycolic acid must be used in sufficiently basic medium (in practice at a pH of between 8.5 and 9.5) if curling of satisfactory intensity is to be obtained. Besides the drawback of releasing an unpleasant odour requiring the use of more or less efficient fragrances to mask the odours, the use of a thiol at alkaline pH also results in degradation of the fibre and most particularly in impairment of artificial colorations.
- Sulfites or bisulfites are mainly used for relaxing the hair. They have drawbacks similar to those of thiols, with lower efficacy.
- Thiols and sulfites also have the drawback of having poor stability in aqueous solution.
- the durability of the reshaping effects obtained with thiols and sulfites by reduction of disulfides following by fixing is judged to be very much lower than that which may be obtained via the lanthionization technique.
- compositions generally used to perform lanthionization contain as base a hydroxide such as sodium hydroxide, guanidinium hydroxide or lithium hydroxide.
- lanthionization active agents which allow opening of the disulfide bonds via a beta-elimination mechanism, are generally used as a water-oil emulsion at concentrations of between 0.4 and 0.6 M, by leaving them to act generally for 10 to 15 minutes at room temperature.
- Sodium hydroxide remains the agent most frequently used.
- Guanidinium hydroxide is now the preferred compound for many compositions.
- These two hydroxides, sodium hydroxide and guanidinium hydroxide are the two main agents used for the relaxing or uncurling of naturally curly hair.
- hydroxides also affects the state of the hair by firstly giving it a coarse feel and secondly making it much more brittle, this brittleness possibly going as far as crumbling or breaking or even dissolution of the hair if the treatment is prolonged. In certain cases, hydroxides also cause decoloration of the natural colour of the hair.
- Formulations containing sodium hydroxide are generally referred to as “lye relaxers” and those not containing it are referred as “no-lye relaxers”.
- guanidinium hydroxide Since guanidinium hydroxide is unstable, it is generated at the time of use by mixing guanidinium carbonate and a source of sparingly soluble hydroxide such as calcium hydroxide. The reaction between these two compounds leads to the formation of guanidinium hydroxide and calcium carbonate, which precipitates in the composition. The presence of this precipitate makes the final rinsing of the hair much more difficult and leaves mineral particles on the hair and the scalp, which give it a coarse feel and an unaesthetic appearance resembling dandruff.
- guanidinium hydroxide (“no-lye”) over sodium hydroxide (“lye”) appears to arise from better relaxing efficacy and better skin tolerance.
- these techniques using bases of the hydroxide family remain very aggressive to the hair and the scalp and require very strict control of the duration of application to avoid excessive irritation and impairment of the hair that may go as far as breakage.
- This aggressiveness arising from the causticity of hydroxides is justification for not using these hair lanthionization compositions for permanent waving (hair waving), but solely for hair straightening or hair relaxing.
- hydroxides are known to be good agents for hydrolysing amide functions (cf. for example March's Advanced Organic Chemistry, 5th edition, Wiley Interscience, New York, “Hydrolysis of Amides” page 474 et seq.), which thus lead to cleavage of peptide bonds by direct nucleophilic attack. It is thus probable that the observed impairments of the hair and of keratin materials in the broad sense are largely due to partial hydrolysis of the amide bonds of keratin.
- thioglycolic acid in the form of ammonium thioglycolate remains both the reference compound and the compound most widely used in cosmetic formulations, not only for shaping but also for straightening the hair.
- hydroxides serving as lanthionization active agent
- additives generally serving to protect the hair. Mention will be made, for example, of:
- hair can be durably relaxed by combining the action of an ⁇ -hydroxy acid and/or keto acid derivative and of a means of heating to a temperature above 110° C. Excellent results in terms of relaxing, cosmetic properties of the hair and fibre integrity are thus obtained.
- the Applicant considers that there is a combined action, on the keratin fibres, of an ⁇ -hydroxy acid and/or keto acid derivative and of a heating means, which allows the fibres to be efficiently and durably relaxed.
- the invention relates to a process for relaxing keratin fibres, comprising:
- the temperature is raised using a heating means to a temperature of between 120° C. and 220° C. and more advantageously between 140° C. and 220° C.
- the said composition is applied to wet keratin fibres.
- a step intended to remove the excess composition may also be introduced between the step of applying the composition and the step of raising the temperature.
- R1 H, OH, NH2, CH2-COOH or a linear or branched C1-C4 alkyl
- R2 H, COOH, CHOH—COOH, CF3, CH ⁇ CH2, NHCONH2, a linear, branched or cyclic C1-C8 alkyl optionally substituted with a radical chosen from OH, Cl, NH2, COOH, CF3 and SCH3; a phenyl or benzyl optionally substituted with one OH or OCH3 radical; or alternatively the radical
- R1 and R2 may also together form an oxo radical ( ⁇ O) or a cyclopropyl, cyclobutyl, hydroxycyclobutyl, cyclopentyl or cyclohexyl ring with the carbon atom that bears them, or alternatively a radical
- glycolic acid oxalic acid lactic acid 1-hydroxy-1-cyclopropanecarboxylic acid 2-hydroxy-3-butenoic acid 2-hydroxyisobutyric acid 2-hydroxy-n-butyric acid isoserine glyceric acid 2-hydroxy-3-methylbutyric acid 2-hydroxy-2-methylbutyric acid 2-hydroxyvaleric acid 4-amino-2-hydroxybutyric acid 1-hydroxycyclohexanecarboxylic acid dihydroxyfumaric acid citramalic acid tartaric acid citric acid 2-hydroxy-4-(methylthio)butyric acid mandelic acid 2-hydroxy-3-methylvaleric acid glyoxylurea ⁇ -imidazolelactic acid 2-trifluoromethyl-2-hydroxypropionic acid hexahydromandelic acid 2-hydroxyoctanoic acid arabic acid 3-phenylactic acid hydroxyphenylglycine 3-hydroxymandelic acid 4-hydroxymandelic acid 2-hydroxynonanoic acid L-arginic acid 3-methoxymandelic acid 4-
- N-2-hydroxyethyllactamide and the stereoisomers, organic or mineral salts and solvates thereof.
- R5 COOH, a linear or branched C1-C6 alkyl optionally substituted with an OH, COOH or Br radical; a phenyl or benzyl optionally substituted with an OH or COOH radical; or an indolyl radical or
- N-2-hydroxyethylpyruvamide and the stereoisomers, organic or mineral salts and solvates thereof.
- the working molar concentration is advantageously between 2 and 8 M and more advantageously between 4 and 8M.
- the working pH is preferably less than or equal to 7.
- compositions according to the invention are either in the form of an aqueous solution or in the form of a thickened cream so as to keep the hair as straight as possible. These creams are prepared in the form of “heavy” emulsions.
- compositions contain at least one ⁇ -hydroxy acid derivative of formula (I) and/or at least one keto acid derivative of formula (II) and/or mixtures thereof in all proportions.
- compositions of the invention contain the hydroxy acid and/or keto acid derivative as sole hair-relaxing active agent.
- composition used according to the invention may also comprise one or more additional cosmetic active agents.
- the said additional cosmetic active agent(s) represent(s) from 0.01% to 30% and preferably from 0.1% to 10% by weight relative to the total weight of the cosmetic composition.
- the composition applied to the keratin fibres is applied in an amount of from 0.05 to 20 g and preferably from 0.1 to 10 g of composition per gram of dry keratin fibre.
- the said composition After applying the composition, and before raising the temperature of the keratin fibres using a heating means, the said composition may be left to act, generally for 30 seconds to 60 minutes and preferably 5 to 45 minutes.
- the process according to the invention includes, after the step of applying the composition, a step of raising the temperature of the keratin fibres, using a heating means, to a temperature of between 110° C. and 250° C.
- an iron is used as heating means.
- iron means a device for heating keratin fibres that places the said fibres and the heating device in contact.
- the end of the iron that comes into contact with the hair generally has two flat surfaces. These two flat surfaces may be metallic. They may be smooth or crinkled.
- irons that may be used in the process according to the invention, mention may be made of flat irons of any type, and in particular, in a non-limiting manner, those described in U.S. Pat. No. 5,957,140 and U.S. Pat. No. 5,046,516.
- the iron may be applied by successive separate touches of a few seconds, or by gradually moving or sliding it along the locks.
- the iron is applied by continuous movement from the root to the end, in one or more passes.
- the process according to the invention may also include an additional step of partial predrying of the keratin fibres before the step of raising the temperature, so as to avoid substantial evolution of steam that might burn the stylist's hands and the individual's scalp.
- This predrying step may take place, for example, using a hairdryer, a hood or alternatively by drying in the open air.
- the invention also relates to a kit comprising at least:
- the hair-relaxing composition contains at least one ⁇ -hydroxy acid derivative of formula (I) and/or at least one keto acid derivative of formula (II) and/or mixtures thereof in all proportions as defined above.
- a simplified hair-relaxing composition is prepared, containing DL-lactic acid at a concentration of 8 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 15 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds.
- the hair is efficiently relaxed and feels soft.
- a simplified hair-relaxing composition is prepared, containing pyruvic acid at a concentration of 8 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 15 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds.
- the hair is efficiently relaxed and feels soft.
- a simplified hair-relaxing composition is prepared, containing pyruvic acid at a concentration of 4 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 25 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds.
- the hair is efficiently relaxed and feels soft.
- a simplified hair-relaxing composition is prepared, containing L-lactic acid at a concentration of 4 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 25 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds.
- the hair is efficiently relaxed and feels soft.
Abstract
The invention concerns a method for straightening keratinous fibers including: (i) a step of applying on the keratinous fibers a hair straightening composition containing at least one alpha-hydroxy and/or keto acid derivative, the pH of said composition being not more than 9 (ii) a step of increasing the temperature of the keratinous fibers, using heating means, to a temperature ranging between 110 and 250° C.
Description
- The invention relates to a process for relaxing keratin fibres with a heating means and at least one α-hydroxy acid and/or keto acid derivative.
- The relaxing process according to the invention is performed without using any reducing agent or lanthionizing agent. It does not include any reducing or lanthionization step.
- According to the invention, the term “keratin fibres” means fibres of human or animal origin such as head hair, bodily hair, the eyelashes, wool, angora, cashmere or fur. Although the invention is not limited to particular keratin fibres, reference will nevertheless be made more particularly to head hair.
- According to the invention, the term “relaxing” covers the relaxing, straightening or uncurling of Caucasian or African hair.
- The term “heating means” means any means for heating keratin fibres to a temperature of at least 110° C., such as heating irons, for example flat or round irons, microwave generators or sources of infrared radiation.
- Two techniques are used for permanently reshaping the hair. They are based on cleavage of the disulfide covalent bonds present in keratin (cystine):
-
- the first consists, in a first stage, in performing this opening of the disulfide bonds using a composition containing a reducing agent, and then, after having preferably rinsed the hair, in reconstituting the said disulfide bonds in a second stage, by applying to the hair, which has been placed under tension beforehand with rollers or the like or shaped or straightened out by other means, an oxidizing composition also known as a fixer, so as to give the head of hair the desired shape. This technique makes it possible either to make the hair wavy or to relax it, uncurl it or straighten it out;
- the second consists in performing a “lanthionization” operation using a composition containing a base belonging to the hydroxide family. This leads to replacement of the disulfide bonds (—CH2-S—S—CH2-) with lanthionine bonds (—CH2-S—CH2-). This lanthionization operation involves two consecutive chemical reactions:
- the first reaction consists of a beta-elimination on cystine brought about by a hydroxide ion, leading to the cleavage of this bond and to the formation of dehydroalanine:
-
- the second reaction is a reaction of dehydroalanine with a thiol group. Specifically, the double bond of the dehydroalanine formed is a reactive double bond. It can react with the thiol group of the cysteine residue that has been released to form a new bond referred as a lanthionine bridge or bond or residue.
- Relative to the first technique using a reducing agent, this lanthionization technique does not require a fixing step, since the formation of the lanthionine bridges is irreversible. It is thus performed in a single step and makes it possible either to make the hair wavy, or to relax it, uncurl or straighten it out. However, it is mainly used for relaxing naturally curly hair.
- For the first technique, the reducing compositions generally used for the first step of a permanent-waving or hair-relaxing operation contain thiols, sulfites or bisulfites as reducing agent. These agents are generally used in essentially aqueous medium at concentrations of between 0.5 and 1 M to obtain good opening of the disulfide bonds. Among the thiols, those commonly used are thioglycolic acid, cysteamine, glyceryl monothioglycolate, thiolactic acid and cysteine. Thioglycolic acid is particularly efficient at reducing the disulfide bonds of keratin at alkaline pH, especially in the form of ammonium thioglycolate, and constitutes the product most frequently used in permanent waving (“hair waving”). It has been found, however, that thioglycolic acid must be used in sufficiently basic medium (in practice at a pH of between 8.5 and 9.5) if curling of satisfactory intensity is to be obtained. Besides the drawback of releasing an unpleasant odour requiring the use of more or less efficient fragrances to mask the odours, the use of a thiol at alkaline pH also results in degradation of the fibre and most particularly in impairment of artificial colorations.
- Sulfites or bisulfites are mainly used for relaxing the hair. They have drawbacks similar to those of thiols, with lower efficacy.
- Thiols and sulfites (or bisulfites) also have the drawback of having poor stability in aqueous solution.
- In general, the durability of the reshaping effects obtained with thiols and sulfites by reduction of disulfides following by fixing is judged to be very much lower than that which may be obtained via the lanthionization technique.
- For the second technique, the compositions generally used to perform lanthionization contain as base a hydroxide such as sodium hydroxide, guanidinium hydroxide or lithium hydroxide. These lanthionization active agents, which allow opening of the disulfide bonds via a beta-elimination mechanism, are generally used as a water-oil emulsion at concentrations of between 0.4 and 0.6 M, by leaving them to act generally for 10 to 15 minutes at room temperature. Sodium hydroxide remains the agent most frequently used. Guanidinium hydroxide is now the preferred compound for many compositions. These two hydroxides, sodium hydroxide and guanidinium hydroxide, are the two main agents used for the relaxing or uncurling of naturally curly hair. They have several advantages over ammonium thioglycolate and sulfites, in particular the absence of unpleasant odour, the fact that only one operating step is required (shorter treatment time) and much greater durability and efficacy of reshaping of the hair.
- However, these hydroxides have the major drawback of being caustic. This causticity affects the scalp by causing irritation, which is occasionally severe. This may be partially remedied by applying beforehand to the scalp fatty protective cream often referred to as a “base” or “base cream”, the word “base” in this case not having the meaning of a basic agent in the chemical sense. When the protective cream is combined with the hydroxide in a single composition, it is generally referred to as “no-base”, as opposed to the above name. This “no-base” technique is preferred.
- The causticity of hydroxides also affects the state of the hair by firstly giving it a coarse feel and secondly making it much more brittle, this brittleness possibly going as far as crumbling or breaking or even dissolution of the hair if the treatment is prolonged. In certain cases, hydroxides also cause decoloration of the natural colour of the hair.
- Formulations containing sodium hydroxide are generally referred to as “lye relaxers” and those not containing it are referred as “no-lye relaxers”.
- The main relaxing formulations known as “no-lye” relaxers use guanidinium hydroxide. Since guanidinium hydroxide is unstable, it is generated at the time of use by mixing guanidinium carbonate and a source of sparingly soluble hydroxide such as calcium hydroxide. The reaction between these two compounds leads to the formation of guanidinium hydroxide and calcium carbonate, which precipitates in the composition. The presence of this precipitate makes the final rinsing of the hair much more difficult and leaves mineral particles on the hair and the scalp, which give it a coarse feel and an unaesthetic appearance resembling dandruff. The recent success of guanidinium hydroxide (“no-lye”) over sodium hydroxide (“lye”) appears to arise from better relaxing efficacy and better skin tolerance. However, these techniques using bases of the hydroxide family remain very aggressive to the hair and the scalp and require very strict control of the duration of application to avoid excessive irritation and impairment of the hair that may go as far as breakage. This aggressiveness arising from the causticity of hydroxides is justification for not using these hair lanthionization compositions for permanent waving (hair waving), but solely for hair straightening or hair relaxing.
- Furthermore, hydroxides are known to be good agents for hydrolysing amide functions (cf. for example March's Advanced Organic Chemistry, 5th edition, Wiley Interscience, New York, “Hydrolysis of Amides” page 474 et seq.), which thus lead to cleavage of peptide bonds by direct nucleophilic attack. It is thus probable that the observed impairments of the hair and of keratin materials in the broad sense are largely due to partial hydrolysis of the amide bonds of keratin.
- There is thus a real need for relaxing compositions that are markedly less aggressive to the hair.
- Various studies have been conducted in order to overcome both the drawbacks of reducing agents (first technique) and/or those of hydroxides (second technique).
- Thus, many reducing agents have been proposed to replace thioglycolic acid, but thioglycolic acid in the form of ammonium thioglycolate remains both the reference compound and the compound most widely used in cosmetic formulations, not only for shaping but also for straightening the hair.
- It has also been proposed in numerous patents to combine common reducing agents (thiols, sulfites or bisulfites) with urea or alkyl ureas to reduce the irritation and damage caused to the hair, not only for shaping but also for relaxing. Mention will be made, for example, of:
-
- patent application CA 1315204, which describes a composition containing ammonium thioglycolate (5.5-11.5%) and urea or a monoalkyl urea (1-3%) for shaping the hair,
- U.S. Pat. No. 3,847,165, which describes a composition containing ammonium thioglycolate (1.2-1.4 M) and urea (2.0-2.7 M) for shaping the hair at an acidic pH,
- patent application NL 6410355, which describes a composition containing a sulfite (0.8-1.5 M) and urea (0.6-3.0 M) for shaping and relaxing the hair,
- patent application JP 2000/229 819, which describes a composition containing a sulfite or bisulfite (0.5-15%), urea (0.5-15%) and an alcohol (ethanol and/or isopropanol, 1-30%) for shaping and relaxing the hair.
- It has also been proposed in numerous patents to combine hydroxides, serving as lanthionization active agent, with certain additives generally serving to protect the hair. Mention will be made, for example, of:
-
- patent application WO 2002/003 937, which describes a composition containing C3-C5 monosaccharides,
- patent application WO 2001/064 171, which describes a composition containing complexing agents,
- U.S. Pat. No. 5,641,477, which describes a composition containing a hydrogenated starch hydrolysate,
- patent application WO 02/085 317, which describes a composition containing organic nucleophiles that react during the second step with the dehydroalanine formed with hydroxides, to give new bridges.
- Although all these proposals lead to more or less pronounced improvements, they are not able to sufficiently reduce the damage associated with the very causticity of hydroxides.
- As indicated previously, the use of reducing agents leads to poor durability of the relaxing or straightening of the hair and the use of hydroxides, on account of their causticity, limits their use in the field of hair relaxing.
- After considerable studies, it has now been discovered, entirely surprisingly and unexpectedly, that hair can be durably relaxed by combining the action of an α-hydroxy acid and/or keto acid derivative and of a means of heating to a temperature above 110° C. Excellent results in terms of relaxing, cosmetic properties of the hair and fibre integrity are thus obtained.
- Without being bound by theory, the Applicant considers that there is a combined action, on the keratin fibres, of an α-hydroxy acid and/or keto acid derivative and of a heating means, which allows the fibres to be efficiently and durably relaxed.
- The Applicant has found that it is possible to overcome the drawbacks of the prior art and to satisfy the abovementioned objectives by performing a process for relaxing keratin fibres, comprising:
-
- a step of applying to the keratin fibres a hair-relaxing composition containing at least one α-hydroxy acid and/or keto acid derivative, the pH of this composition being less than or equal to 9,
- a step of raising the temperature of the keratin fibres, using a heating means, to a temperature of between 110 and 250° C.
- Thus, the invention relates to a process for relaxing keratin fibres, comprising:
-
- a step of applying to the keratin fibres a hair-relaxing composition containing at least one α-hydroxy acid and/or keto acid derivative, the pH of this composition being less than or equal to 9,
- a step of raising the temperature of the keratin fibres, using a heating means, to a temperature of between 110 and 250° C.
- Advantageously, the temperature is raised using a heating means to a temperature of between 120° C. and 220° C. and more advantageously between 140° C. and 220° C.
- Preferably, the said composition is applied to wet keratin fibres.
- A step intended to remove the excess composition, for example using a towel, may also be introduced between the step of applying the composition and the step of raising the temperature.
-
- R1=H, OH, NH2, CH2-COOH or a linear or branched C1-C4 alkyl,
R2=H, COOH, CHOH—COOH, CF3, CH═CH2, NHCONH2, a linear, branched or cyclic C1-C8 alkyl optionally substituted with a radical chosen from OH, Cl, NH2, COOH, CF3 and SCH3;
a phenyl or benzyl optionally substituted with one OH or OCH3 radical;
or alternatively the radical - R1 and R2 may also together form an oxo radical (═O) or a cyclopropyl, cyclobutyl, hydroxycyclobutyl, cyclopentyl or cyclohexyl ring with the carbon atom that bears them, or alternatively a radical
- when R1=H, R2 may also represent a (CHOH)2CH2OH or (CHOH)3CH2OH radical,
R═OH or NR3R4 with R3, R4=H or a linear or branched C1-C4 alkyl optionally substituted with one or two OH radicals
and the stereoisomers, organic or mineral salts and solvates thereof. - glycolic acid
oxalic acid
lactic acid
1-hydroxy-1-cyclopropanecarboxylic acid
2-hydroxy-3-butenoic acid
2-hydroxyisobutyric acid
2-hydroxy-n-butyric acid
isoserine
glyceric acid
2-hydroxy-3-methylbutyric acid
2-hydroxy-2-methylbutyric acid
2-hydroxyvaleric acid
4-amino-2-hydroxybutyric acid
1-hydroxycyclohexanecarboxylic acid
dihydroxyfumaric acid
citramalic acid
tartaric acid
citric acid
2-hydroxy-4-(methylthio)butyric acid
mandelic acid
2-hydroxy-3-methylvaleric acid
glyoxylurea
β-imidazolelactic acid
2-trifluoromethyl-2-hydroxypropionic acid
hexahydromandelic acid
2-hydroxyoctanoic acid
arabic acid
3-phenylactic acid
hydroxyphenylglycine
3-hydroxymandelic acid
4-hydroxymandelic acid
2-hydroxynonanoic acid
L-arginic acid
3-methoxymandelic acid
4-methoxymandelic acid
3-(4-hydroxyphenyl)lactic acid
tartronic acid
tartaric acid
β-chlorolactic acid
1-cyclopentanol-1-carboxylic acid
1,2-dihydroxycyclobutanecarboxylic acid
2-ethyl-2-hydroxybutric acid
α-hydroxyisocaproic acid
α-hydroxycaproic acid
2-hydroxy-3,3-dimethylbutyric acid
malic acid
hydroxytartronic acid
gluconic acid
lactamide - N-2-hydroxyethyllactamide
and the stereoisomers, organic or mineral salts and solvates thereof. - glycolic acid
oxalic acid
L-lactic acid
DL-lactic acid
D-lactic acid
malic acid
tartaric acid
DL-glyceric acid
arabic acid
gluconic acid
hydroxytartronic acid
lactamide - N-2-hydroxyethyllactamide
-
- R5=COOH, a linear or branched C1-C6 alkyl optionally substituted with an OH, COOH or Br radical; a phenyl or benzyl optionally substituted with an OH or COOH radical; or an indolyl radical or
- and the stereoisomers, organic or mineral salts and solvates thereof.
- pyruvic acid
2-ketobutyric acid
β-hydroxypyruvic acid
3-methyl-2-oxobutyric acid
2-oxovaleric acid
ketomalonic acid
3-methyl-2-oxovaleric acid trimethylpyruvic acid
oxolacetic acid
2-ketoglutaric acid
benzylformic acid
2-oxooctanoic acid
2-oxoadipic acid
phenylpyruvic acid
bromopyruvic acid
2-ketopimelic acid
4-hydroxyphenylpyruvic acid
3-indoleglyoxalic acid imidazolopyruvic acid HCl
2-keto-L-gulonic acid
2-carboxy-α-oxobenzeneacetic acid
3-indolepyruvic acid
2-ketoglutaric acid dihydrate pyruvamide - N-2-hydroxyethylpyruvamide
and the stereoisomers, organic or mineral salts and solvates thereof. - pyruvic acid
2-ketobutyric acid
β-hydroxypyruvic acid
ketomalonic acid
oxolacetic acid
2-ketoglutaric acid
2-keto-L-gulonic acid
2-ketoglutaric acid dihydrate
pyruvamide - The working molar concentration is advantageously between 2 and 8 M and more advantageously between 4 and 8M.
- pH
- The working pH is preferably less than or equal to 7.
- The compositions according to the invention are either in the form of an aqueous solution or in the form of a thickened cream so as to keep the hair as straight as possible. These creams are prepared in the form of “heavy” emulsions.
- These compositions contain at least one α-hydroxy acid derivative of formula (I) and/or at least one keto acid derivative of formula (II) and/or mixtures thereof in all proportions.
- Advantageously, the compositions of the invention contain the hydroxy acid and/or keto acid derivative as sole hair-relaxing active agent.
- For the purpose of improving the cosmetic properties of keratin fibres or to attenuate or avoid their degradation, the composition used according to the invention may also comprise one or more additional cosmetic active agents.
- Generally, the said additional cosmetic active agent(s) represent(s) from 0.01% to 30% and preferably from 0.1% to 10% by weight relative to the total weight of the cosmetic composition.
- Generally, the composition applied to the keratin fibres is applied in an amount of from 0.05 to 20 g and preferably from 0.1 to 10 g of composition per gram of dry keratin fibre.
- After applying the composition, and before raising the temperature of the keratin fibres using a heating means, the said composition may be left to act, generally for 30 seconds to 60 minutes and preferably 5 to 45 minutes.
- The process according to the invention includes, after the step of applying the composition, a step of raising the temperature of the keratin fibres, using a heating means, to a temperature of between 110° C. and 250° C.
- Advantageously, an iron is used as heating means.
- For the purposes of the present invention, the term “iron” means a device for heating keratin fibres that places the said fibres and the heating device in contact.
- The end of the iron that comes into contact with the hair generally has two flat surfaces. These two flat surfaces may be metallic. They may be smooth or crinkled.
- As examples of irons that may be used in the process according to the invention, mention may be made of flat irons of any type, and in particular, in a non-limiting manner, those described in U.S. Pat. No. 5,957,140 and U.S. Pat. No. 5,046,516.
- The iron may be applied by successive separate touches of a few seconds, or by gradually moving or sliding it along the locks.
- Preferably, in the process according to the invention, the iron is applied by continuous movement from the root to the end, in one or more passes.
- The process according to the invention may also include an additional step of partial predrying of the keratin fibres before the step of raising the temperature, so as to avoid substantial evolution of steam that might burn the stylist's hands and the individual's scalp. This predrying step may take place, for example, using a hairdryer, a hood or alternatively by drying in the open air.
- The invention also relates to a kit comprising at least:
-
- one heating means that affords a temperature of between 110 and 250° C.,
- one hair-relaxing composition containing at least one α-hydroxy acid and/or keto acid derivative, the pH of this composition being less than or equal to 9.
- Advantageously, in the kit, the hair-relaxing composition contains at least one α-hydroxy acid derivative of formula (I) and/or at least one keto acid derivative of formula (II) and/or mixtures thereof in all proportions as defined above.
- The invention may be understood more clearly with the aid of the non-limiting examples that follow, which constitute preferential embodiments of the compositions according to the invention.
- A simplified hair-relaxing composition is prepared, containing DL-lactic acid at a concentration of 8 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 15 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.
- A simplified hair-relaxing composition is prepared, containing pyruvic acid at a concentration of 8 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 15 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.
- A simplified hair-relaxing composition is prepared, containing pyruvic acid at a concentration of 4 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 25 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.
- A simplified hair-relaxing composition is prepared, containing L-lactic acid at a concentration of 4 M in water, as hair-relaxing active agent. This composition is applied to naturally curly African hair for 25 minutes at a temperature of 40° C., and the hair is then rapidly towel-dried.
- Lock-by-lock straightening of the head of hair is then performed using a flat iron heated to 180° C., for 10 to 15 seconds. The hair is efficiently relaxed and feels soft.
Claims (17)
1-14. (canceled)
15. A process for relaxing keratin fibers, comprising:
applying to the keratin fibers a hair-relaxing composition comprising at least one α-hydroxy acid or keto acid derivative, wherein the pH of said composition is less than or equal to 9, and
heating the keratin fibers to a temperature of from 110° C. to 250° C.
16. A process according to claim 15 , wherein said keratin fibers are heated to a temperature of from 120° C. to 220° C.
17. A process according to claim 16 , wherein said keratin fibers are heated to a temperature of from 140° C. to 220° C.
18. The process according to claim 15 , wherein the said composition is applied to wet keratin fibers.
19. The process according to claim 15 , wherein the said fibers are partially predried.
20. The process according to claim 15 , wherein the molar concentration of the at least one α-hydroxy acid and/or of keto acid derivative is from 2 to 8 M.
21. The process according to claim 20 , wherein the molar concentration of the at least one α-hydroxy acid or of keto acid derivative is from 4 to 8 M.
22. The process according to claim 15 , wherein the pH of the composition is less than or equal to 7.
23. The process according to claim 15 , wherein the at least one α-hydroxy acid derivative corresponds to the formula (I):
R is chosen from OH and NR3R4 wherein R3 and R4 are independently chosen from hydrogen and a linear or branched C1-C4 alkyl optionally substituted with at least one OH radical;
R1 is chosen from: H, OH, NH2, CH2—COOH, and a linear or branched C1-C4 alkyl,
R2 is chosen from
H,
COOH,
CHOH—COOH,
CF3,
CH═CH2,
NHCONH2,
a linear, branched or cyclic C1-C8 alkyl optionally substituted with a radical chosen from OH, Cl, NH2, COOH, CF3, and SCH3; and
a phenyl and benzyl optionally substituted with one OH or OCH3 radical;
or substituted with the radical
or
R1 and R2 optionally are taken together to form an oxo radical (═O) or a cyclopropyl, cyclobutyl, hydroxycyclobutyl, cyclopentyl or cyclohexyl ring with the carbon atom that bears them,
or the at least one α-hydroxy acid derivative corresponds to the radical
provided that when R1 is H, then R2 is chosen from a (CHOH)2CH2OH and (CHOH)3CH2OH radical,
and the stereoisomers and organic or mineral salts thereof.
24. The process according to claim 23 , wherein the compounds of formula (I) are chosen from:
glycolic acid,
oxalic acid,
lactic acid,
1-hydroxy-1-cyclopropanecarboxylic acid,
2-hydroxy-3-butenoic acid,
2-hydroxyisobutyric acid,
2-hydroxy-n-butyric acid,
isoserine,
glyceric acid,
2-hydroxy-3-methylbutyric acid,
2-hydroxy-2-methylbutyric acid,
2-hydroxyvaleric acid,
4-amino-2-hydroxybutyric acid,
1-hydroxycyclohexanecarboxylic acid,
dihydroxyfumaric acid,
citramalic acid,
tartaric acid,
citric acid,
2-hydroxy-4-(methylthio)butyric acid,
mandelic acid,
2-hydroxy-3-methylvaleric acid,
glyoxylurea,
β-imidazolelactic acid,
2-trifluoromethyl-2-hydroxypropionic acid,
hexahydromandelic acid,
2-hydroxyoctanoic acid,
arabic acid,
3-phenylactic acid,
hydroxyphenylglycine,
3-hydroxymandelic acid,
4-hydroxymandelic acid,
2-hydroxynonanoic acid,
L-arginic acid,
3-methoxymandelic acid,
4-methoxymandelic acid,
3-(4-hydroxyphenyl)lactic acid,
tartronic acid,
tartaric acid,
β-chlorolactic acid,
1-cyclopentanol-1-carboxylic acid,
1,2-dihydroxycyclobutanecarboxylic acid,
2-ethyl-2-hydroxybutric acid,
α-hydroxyisocaproic acid,
α-hydroxycaproic acid,
2-hydroxy-3,3-dimethylbutyric acid,
malic acid,
hydroxytartronic acid,
gluconic acid,
lactamide,
N-methyllactamide,
N-ethyllactamide,
N,N-dimethyllactamide,
N-2-hydroxyethyllactamide,
and the stereoisomers and organic or mineral salts thereof.
25. The process according to claim 24 , wherein the compounds of formula (I) are chosen from:
glycolic acid,
oxalic acid,
L-lactic acid,
DL-lactic acid,
D-lactic acid,
malic acid,
tartaric acid,
DL-glyceric acid,
arabic acid,
gluconic acid,
hydroxytartronic acid,
lactamide,
N-methyllactamide,
N-ethyllactamide, and
N-2-hydroxyethyllactamide.
26. The process according to claim 15 , wherein the at least one α-keto acid derivative correspond to formula (II):
wherein
R5 is chosen from
COOH,
a linear or branched C1-C6 alkyl optionally substituted with an OH, COOH or Br radical;
a phenyl or benzyl optionally substituted with an OH or COOH radical;
or an indolyl radical or
and the stereoisomers and organic or mineral salts thereof.
27. The process according to claim 26 , wherein the compounds of formula (II) are chosen from:
pyruvic acid,
2-ketobutyric acid,
β-hydroxypyruvic acid,
3-methyl-2-oxobutyric acid,
2-oxovaleric acid,
ketomalonic acid,
3-methyl-2-oxovaleric acid,
trimethylpyruvic acid,
oxolacetic acid,
2-ketoglutaric acid,
benzylformic acid,
2-oxooctanoic acid,
2-oxoadipic acid,
phenylpyruvic acid,
bromopyruvic acid,
2-ketopimelic acid,
4-hydroxyphenylpyruvic acid,
3-indoleglyoxalic acid,
imidazolopyruvic acid HCl,
2-keto-L-gulonic acid,
2-carboxy-α-oxobenzeneacetic acid,
3-indolepyruvic acid,
2-ketoglutaric acid dihydrate,
pyruvamide,
N-methylpyruvamide,
N-ethylpyruvamide,
N,N-dimethylpyruvamide, and
N-2-hydroxyethylpyruvamide,
and the stereoisomers and organic or mineral salts thereof.
28. The process according to claim 26 , wherein the compounds of formula (II) are chosen from:
pyruvic acid,
2-ketobutyric acid,
β-hydroxypyruvic acid,
ketomalonic acid,
oxolacetic acid,
2-ketoglutaric acid,
2-keto-L-gulonic acid,
2-ketoglutaric acid dihydrate, and
pyruvamide.
29. A kit comprising at least:
one heating apparatus that provides a temperature of from 110° C. to 250° C.,
at least one hair-relaxing composition comprising at least one α-hydroxy acid and/or keto acid derivative, wherein the pH of said at least one composition is less than or equal to 9.
30. A kit according to claim 29 , wherein the hair-relaxing composition comprises at least one α-hydroxy acid and/or keto acid derivative of formula (I) chosen from:
glycolic acid,
oxalic acid,
lactic acid,
1-hydroxy-1-cyclopropanecarboxylic acid,
2-hydroxy-3-butenoic acid,
2-hydroxyisobutyric acid,
2-hydroxy-n-butyric acid,
isoserine,
glyceric acid,
2-hydroxy-3-methylbutyric acid,
2-hydroxy-2-methylbutyric acid,
2-hydroxyvaleric acid,
4-amino-2-hydroxybutyric acid,
1-hydroxycyclohexanecarboxylic acid,
dihydroxyfumaric acid,
citramalic acid,
tartaric acid,
citric acid,
2-hydroxy-4-(methylthio)butyric acid,
mandelic acid,
2-hydroxy-3-methylvaleric acid,
glyoxylurea,
β-imidazolelactic acid,
2-trifluoromethyl-2-hydroxypropionic acid,
hexahydromandelic acid,
2-hydroxyoctanoic acid,
arabic acid,
3-phenylactic acid,
hydroxyphenylglycine,
3-hydroxymandelic acid,
4-hydroxymandelic acid,
2-hydroxynonanoic acid,
L-arginic acid,
3-methoxymandelic acid,
4-methoxymandelic acid,
3-(4-hydroxyphenyl)lactic acid,
tartronic acid,
tartaric acid,
β-chlorolactic acid,
1-cyclopentanol-1-carboxylic acid,
1,2-dihydroxycyclobutanecarboxylic acid,
2-ethyl-2-hydroxybutric acid,
α-hydroxyisocaproic acid,
α-hydroxycaproic acid,
2-hydroxy-3,3-dimethylbutyric acid,
malic acid,
hydroxytartronic acid,
gluconic acid,
lactamide,
N-methyllactamide,
N-ethyllactamide,
N,N-dimethyllactamide, and
N-2-hydroxyethyllactamide,
and the stereoisomers and organic or mineral salts
and/or formula (II) chosen from:
pyruvic acid,
2-ketobutyric acid,
β-hydroxypyruvic acid,
3-methyl-2-oxobutyric acid,
2-oxovaleric acid,
ketomalonic acid,
3-methyl-2-oxovaleric acid,
trimethylpyruvic acid,
oxolacetic acid,
2-ketoglutaric acid,
benzylformic acid,
2-oxooctanoic acid,
2-oxoadipic acid,
phenylpyruvic acid,
bromopyruvic acid,
2-ketopimelic acid,
4-hydroxyphenylpyruvic acid,
3-indoleglyoxalic acid,
imidazolopyruvic acid HCl,
2-keto-L-gulonic acid,
2-carboxy-α-oxobenzeneacetic acid,
3-indolepyruvic acid,
2-ketoglutaric acid dihydrate,
pyruvamide,
N-methylpyruvamide,
N-ethylpyruvamide,
N,N-dimethylpyruvamide,
N-2-hydroxyethylpyruvamide,
and the stereoisomers and organic or mineral salts,
or mixtures thereof in all proportions.
Priority Applications (5)
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US12/301,840 US20100300471A1 (en) | 2006-05-24 | 2007-05-23 | Method for straightening keratinous fibers using heating means and an acid derivative |
US13/752,652 US8906352B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an α-hydroxy acid derivative |
US13/752,663 US10561216B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an a-keto acid derivative |
US14/953,174 US20160074296A1 (en) | 2006-05-24 | 2015-11-27 | METHOD FOR STRAIGHTENING HUMAN HAIR FIBERS USING HEATING MEANS AND AN a-HYDROXY ACID DERIVATIVE |
US15/296,366 US9743736B2 (en) | 2006-05-24 | 2016-10-18 | Method for straightening human hair fibers using heating means and malic acid |
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FR0651909 | 2006-05-24 | ||
FR0651909A FR2901471B1 (en) | 2006-05-24 | 2006-05-24 | PROCESS FOR DETERMINING KERATIN FIBERS WITH A HEATING MEANS AND AN ACID DERIVATIVE |
US81490406P | 2006-06-20 | 2006-06-20 | |
PCT/FR2007/000872 WO2007135299A1 (en) | 2006-05-24 | 2007-05-23 | Method for straightening keratinous fibers using heating means and an acid derivative |
US12/301,840 US20100300471A1 (en) | 2006-05-24 | 2007-05-23 | Method for straightening keratinous fibers using heating means and an acid derivative |
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US13/752,652 Division US8906352B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an α-hydroxy acid derivative |
US13/752,663 Division US10561216B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an a-keto acid derivative |
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US13/752,652 Active US8906352B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an α-hydroxy acid derivative |
US13/752,663 Active US10561216B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an a-keto acid derivative |
US14/953,174 Pending US20160074296A1 (en) | 2006-05-24 | 2015-11-27 | METHOD FOR STRAIGHTENING HUMAN HAIR FIBERS USING HEATING MEANS AND AN a-HYDROXY ACID DERIVATIVE |
US15/296,366 Active US9743736B2 (en) | 2006-05-24 | 2016-10-18 | Method for straightening human hair fibers using heating means and malic acid |
US15/661,695 Active 2027-08-10 US11013306B2 (en) | 2006-05-24 | 2017-07-27 | Method for straightening keratinous fibers using heating means and malic acid |
US16/773,863 Abandoned US20200229571A1 (en) | 2006-05-24 | 2020-01-27 | METHOD FOR STRAIGHTENING HUMAN HAIR FIBERS USING HEATING MEANS AND AN a-KETO ACID DERIVATIVE |
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US13/752,652 Active US8906352B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an α-hydroxy acid derivative |
US13/752,663 Active US10561216B2 (en) | 2006-05-24 | 2013-01-29 | Method for straightening human hair fibers using heating means and an a-keto acid derivative |
US14/953,174 Pending US20160074296A1 (en) | 2006-05-24 | 2015-11-27 | METHOD FOR STRAIGHTENING HUMAN HAIR FIBERS USING HEATING MEANS AND AN a-HYDROXY ACID DERIVATIVE |
US15/296,366 Active US9743736B2 (en) | 2006-05-24 | 2016-10-18 | Method for straightening human hair fibers using heating means and malic acid |
US15/661,695 Active 2027-08-10 US11013306B2 (en) | 2006-05-24 | 2017-07-27 | Method for straightening keratinous fibers using heating means and malic acid |
US16/773,863 Abandoned US20200229571A1 (en) | 2006-05-24 | 2020-01-27 | METHOD FOR STRAIGHTENING HUMAN HAIR FIBERS USING HEATING MEANS AND AN a-KETO ACID DERIVATIVE |
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WO2014016658A1 (en) | 2012-07-25 | 2014-01-30 | D Ottavi Adele | Semi-permanent modification of the structure of the keratin fibres of the hair through the combined use of heat and mixtures of organic substances |
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JP2009537620A (en) | 2009-10-29 |
JP5934278B2 (en) | 2016-06-15 |
US9743736B2 (en) | 2017-08-29 |
US8906352B2 (en) | 2014-12-09 |
BRPI0711197B1 (en) | 2016-03-01 |
US20130139845A1 (en) | 2013-06-06 |
WO2007135299A1 (en) | 2007-11-29 |
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