Transparent Hair Styling Formulation

Abstract

A clear hair styling formulation is provided, comprising a dermatologically acceptable vehicle and a hair fixative polymer, the hair fixative polymer being hydrolyzed starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 daltons.

Description

[Technical field]

[0001] The present invention relates to a clear hair styling formulation. In particular, the present invention relates to a clear hair styling formulation comprising a dermatologically acceptable vehicle and a hair fixative polymer, the hair fixative polymer being a hydrolyzed starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 daltons.

[0002] Clear hair styling formulations are popular with consumers because they perceive the clarity of the formulation as an indication of purity and quality in hair care products. However, clarity alone is not enough. Other properties such as curl strength or hold and humidity resistance are very important for hair styling products.

[0003] Conventional hair styling formulations contain synthetic polymers to provide style to hair. Synthetic polymers are typically based on vinyl monomers such as polyvinylpyrrolidone (PVP) or n-vinylpyrrolidone (VP). Although such polymers provide good hold while remaining water soluble enough to be easily washed off from hair, they provide a perception of an unfavorable sustainability profile. Therefore, it would be desirable to provide alternative polymers for providing style to hair that provide a more favorable sustainability profile. However, many natural polymers are not compatible with synthetic fixative polymers when blended into hair styling formulations, resulting in a cloudy formulation and / or forming an inhomogeneous film on hair, which inhomogeneity results in poor performance in humidity resistance.

[0004] In U.S. Patent No. 7,972,589, Leighton et al. disclose a hair fixative film having a blend of natural and synthetic polymers. In particular, Leighton et al. disclose a hair fixative film comprising: (a) at least one hair fixative polymer comprising a mixture of synthetic and natural polymers, the ratio of synthetic polymer to natural polymer being about 20:80 to about 75:25, the synthetic polymer being selected from the group consisting of acrylate copolymers, polyurethanes, polystyrenes, polyvinylamides, polyvinyl esters, acrylate / octylacrylamide copolymers, and mixtures thereof; and (b) a plasticizer, the hair fixative film being an unsupported film, having a thickness of about 1 to about 500 microns, providing hair stiffness of about 0.004 Joules to about 0.030 Joules when applied to hair, dissolving when exposed to water, and having a high humidity curl retention of greater than 30 percent after 2 hours.

[0005] Nonetheless, there is a continuing need for new clear hair styling formulations, particularly those containing compatible blends of natural hair fixative polymers and traditional synthetic polymers that are clear and provide effective curl strength or hold and humidity resistance.

[0006] The present invention provides a clear hair styling formulation comprising a dermatologically acceptable vehicle and a hair fixative polymer, the hair fixative polymer being hydrolyzed starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 daltons.

[0007] The present invention provides a clear hair styling formulation comprising a dermatologically acceptable vehicle, a hair fixative polymer, the hair fixative polymer being hydrolyzed starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 daltons, and a thickener.

[0008] The present invention provides a clear hair styling formulation comprising a dermatologically acceptable vehicle, a hair fixative polymer, the hair fixative polymer being a hydrolyzed starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 Daltons, and a thickener, the thickener comprising a crosslinked homopolymer polymerized from (meth)acrylic acid.

[0009] The present invention provides a method of styling hair comprising providing a clear hair styling formulation of the present invention, applying the clear hair styling formulation to the hair, and imparting a style to the hair. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The inventors have surprisingly discovered that a hair fixative polymeric hydrolyzed starch having a weight average molecular weight of 5,000-50,000 Daltons (preferably 7,500-35,000 Daltons, more preferably 8,000-18,000 Daltons, and most preferably 9,000-15,000 Daltons) is exceptionally compatible with conventional thickeners (e.g., carbomers) such that hair styling formulations prepared using blends thereof with conventional thickeners provide excellent high humidity curl retention (i.e., greater than 50% (preferably greater than 75%, more preferably greater than 80%, and most preferably greater than 90%) after 8 hours at 25° C. and 90% relative humidity, and have a turbidity of 0-20 Nephelometric Turbidity Units (NTU) when measured by nephelometry at a concentration of 1% thickener, 3% by weight hair fixative polymeric hydrolyzed starch, and a pH of 7-7.5.

[0011] Unless otherwise indicated, ratios, percentages, parts, etc. are by weight.

[0012] As used herein, unless otherwise indicated, "molecular weight" or MW The phrase refers to weight average molecular weight as measured in a conventional manner using gel permeation chromatography (GPC) and conventional standards such as pullulan narrow molecular weight standards in the molecular weight range of 180 to 708,000 Daltons. GPC techniques are discussed in detail in Modern Size-Exclusion Liquid Chromatography-Practice of Gel Permeation and Gel Filtration Chromatography, Second Edition, AM Striegel, WW Yau, JJ Kirkland, DDBly; John Wiley & Sons, Inc. 2009. Molecular weights are reported herein in units of Daltons, or equivalently, in g / mol.

[0013] The term "dermatologically acceptable" as used in this specification and the appended claims refers to ingredients typically used for topical application to the skin, and is intended to emphasize that materials that are toxic when present in amounts typically found in skin care compositions are not contemplated as part of the present invention.

[0014] Preferably, the clear hair styling formulations of the present invention are selected from the group consisting of hair sprays, hair fixatives, hair mousses, hair gels / creams / pastes, hair volumizing compositions, leave-in hair creams, hair masks, hair lotions, hair serums, hair oils, hair clays, hair pomades, hair waxes, hair powders, and dry shampoos. Preferably, the clear hair styling formulations of the present invention are formulated to facilitate styling of the hair to hold or fix the hair in a particular shape.

[0015] Preferably, the clear hair styling formulations of the present invention have a turbidity of 0-20 (preferably 0-15, more preferably 0-10, most preferably 0-7.5) Nephelometric Turbidity Units (NTU) when measured by turbidimetry at a concentration of 1 wt. % hair fixative polymer and a pH of 7-7.5, the turbidity being measured according to the process described in the Examples.

[0016] Preferably, the clear hair styling formulations of the present invention comprise a dermatologically acceptable vehicle (preferably 25 to 99.5 wt. % (more preferably 48 to 98.15 wt. %, even more preferably 79 to 95.9 wt. %, and most preferably 84.5 to 93 wt. %) of the dermatologically acceptable vehicle based on the weight of the clear hair styling formulation), and a hair fixative polymer (preferably 0.5 to 10 wt. % (more preferably 1 to 8 wt. %, even more preferably 2 to 7.5 wt. %, and most preferably 3 to 6 wt. %) of the hair fixative polymer based on the weight of the clear hair styling formulation), wherein the hair fixative polymer is a hydrolyzed starch (preferably the hydrolyzed starch is selected from the group consisting of hydrolyzed corn starch, hydrolyzed potato starch, hydrolyzed rice starch, hydrolyzed quinoa starch, hydrolyzed pea starch, and mixtures thereof, and more preferably the hydrolyzed starch is selected from the group consisting of hydrolyzed corn starch, hydrolyzed potato starch, and mixtures thereof). and most preferably is hydrolyzed corn starch), a hair fixative polymer, and optionally a thickener (preferably 0-30% by weight (more preferably 0.2-25% by weight, even more preferably 0.5%-15% by weight, and most preferably 0.75-2% by weight of a thickener based on the weight of the clear hair styling formulation), and optionally a plasticizer (preferably 0-30% by weight (more preferably 0.5-20% by weight, and even more preferably 1-1 0% by weight, most preferably 2-5% by weight of a plasticizer), and optionally an antimicrobial / preservative (preferably 0-5% by weight (more preferably 0.05-4% by weight, still more preferably 0.1-3% by weight, most preferably 0.5-2% by weight of an antimicrobial / preservative, based on the weight of the clear hair styling formulation), and optionally a pH adjuster (preferably 0-5% by weight (more preferably 0.1-4% by weight, still more preferably 0.5-3% by weight, most preferably 0.75-2% by weight of an antimicrobial / preservative), and the hydrolyzed starch has a weight average molecular weight of 5,000-50,000 Daltons (preferably 7,500-35,000 Daltons, more preferably 8,000-18,000 Daltons, and most preferably 9,000-15,000 Daltons) (preferably as measured by GPC using pullulan narrow molecular weight standards having a molecular weight range of 180-708,000 Daltons).

[0017] Preferably, the clear hair styling formulation of the present invention comprises 25 to 99.5% by weight (more preferably 48 to 98.15% by weight, even more preferably 79% to 95.9% by weight, most preferably 84.5 to 93% by weight) of a dermatologically acceptable vehicle based on the weight of the clear hair styling formulation. More preferably, the clear hair styling formulation of the present invention comprises 25 to 99.5% by weight (more preferably 48 to 98.15% by weight, even more preferably 79% to 95.9% by weight, most preferably 84.5 to 93% by weight) of a dermatologically acceptable vehicle based on the weight of the clear hair styling formulation, the dermatologically acceptable vehicle comprising water. Even more preferably, the clear hair styling formulations of the present invention comprise from 25 to 99.5% (more preferably from 48 to 98.15%, even more preferably from 79% to 95.9%, and most preferably from 84.5 to 93%) by weight of a dermatologically acceptable vehicle, based on the weight of the clear hair styling formulation, the dermatologically acceptable vehicle being water and aqueous C 1~4 Most preferably, the clear hair styling formulations of the present invention comprise from 25 to 99.5% (more preferably from 48 to 98.15%, even more preferably from 79% to 95.9%, and most preferably from 84.5 to 93%) by weight of the dermatologically acceptable vehicle, based on the weight of the clear hair styling formulation, and the dermatologically acceptable vehicle is water.

[0018] When the clear hair styling formulation is a sprayable formulation, the dermatologically acceptable vehicle preferably comprises 80 to 100% by weight of water, based on the weight of the dermatologically acceptable vehicle, and 0 to 20% by weight of C, based on the weight of the dermatologically acceptable vehicle. 1~4 More preferably, when the clear hair styling formulation is a sprayable formulation, the dermatologically acceptable vehicle preferably comprises 80-100% water by weight, based on the weight of the dermatologically acceptable vehicle, and 0-20% ethanol by weight, based on the weight of the dermatologically acceptable vehicle.

[0019] Preferably, the water used in the clear hair styling formulations of the present invention is at least one of distilled water and deionized water. More preferably, the water used in the clear hair styling formulations of the present invention is distilled and deionized.

[0020] Preferably, the clear hair styling formulations of the present invention comprise from 0.5 to 10% (preferably from 1 to 8%, more preferably from 2 to 7.5%, preferably from 3 to 6%) by weight of a hair fixative polymer, based on the weight of the clear hair styling formulation, wherein the hair fixative polymer is hydrolyzed starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 Daltons (preferably from 7,500 to 35,000 Daltons, more preferably from 8,000 to 18,000 Daltons, most preferably from 9,000 to 15,000 Daltons) (preferably the weight average molecular weight is measured by GPC using pullulan narrow molecular weight standards having a molecular weight range of 180 to 708,000 Daltons). More preferably, the clear hair styling formulations of the present invention comprise from 0.5 to 10% (preferably from 1 to 8%, more preferably from 2 to 7.5%, preferably from 3 to 6%) by weight of a hair fixative polymer based on the weight of the clear hair styling formulation, wherein the hair fixative polymer is a hydrolyzed starch selected from the group consisting of hydrolyzed corn starch, hydrolyzed potato starch, hydrolyzed rice starch, hydrolyzed quinoa starch, and mixtures thereof, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 Daltons (preferably from 7,500 to 35,000 Daltons, more preferably from 8,000 to 18,000 Daltons, and most preferably from 9,000 to 15,000 Daltons) (preferably, the weight average molecular weight is measured by GPC using pullulan narrow molecular weight standards having a molecular weight range of 180 to 708,000 Daltons).Even more preferably, the clear hair styling formulations of the present invention comprise from 0.5 to 10% (preferably from 1 to 8%, more preferably from 2 to 7.5%, preferably from 3 to 6%) by weight of a hair fixative polymer, based on the weight of the clear hair styling formulation, wherein the hair fixative polymer is a hydrolyzed starch selected from the group consisting of hydrolyzed corn starch, hydrolyzed potato starch, and mixtures thereof, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 Daltons (preferably from 7,500 to 35,000 Daltons, more preferably from 8,000 to 18,000 Daltons, and most preferably from 9,000 to 15,000 Daltons) (preferably the weight average molecular weight is measured by GPC using pullulan narrow molecular weight standards having a molecular weight range of 180 to 708,000 Daltons). Most preferably, the clear hair styling formulations of the present invention comprise from 0.5 to 10% (preferably from 1 to 8%, more preferably from 2 to 7.5%, preferably from 3 to 6%) by weight of a hair fixative polymer, based on the weight of the clear hair styling formulation, wherein the hair fixative polymer is hydrolyzed corn starch, the hydrolyzed starch having a weight average molecular weight of from 5,000 to 50,000 daltons (preferably from 7,500 to 35,000 daltons, more preferably from 8,000 to 18,000 daltons, most preferably from 9,000 to 15,000 daltons) (preferably the weight average molecular weight is measured by GPC using pullulan narrow molecular weight standards having a molecular weight range of 180 to 708,000 daltons).

[0021] Preferably, the hydrolyzed starch contains 0 to 100% by weight (preferably 20 to 100% by weight, more preferably 40 to 95% by weight, even more preferably 50 to 90% by weight, most preferably 60 to 75% by weight) of amylopectin, based on the weight of the hydrolyzed starch.

[0022] Preferably, the hydrolyzed starch has a polydispersity M w / M n is more than 2 and 10 (preferably 2.25 to 10, more preferably 2.5 to 9, and most preferably 2.75 to 8).

[0023] Preferably, the clear hair styling formulations of the present invention further comprise 0 to 30% by weight (preferably 0.2 to 25% by weight, more preferably 0.5 to 15% by weight, most preferably 0.75 to 2% by weight) of a thickening agent, based on the weight of the clear hair styling formulation. More preferably, the clear hair styling formulations of the present invention further comprise 0 to 30% by weight (preferably 0.2 to 25% by weight, more preferably 0.5 to 15% by weight, most preferably 0.75 to 2% by weight) of a thickening agent, based on the weight of the clear hair styling formulation, the thickening agent preferably being selected to increase the viscosity of the clear hair styling formulation without substantially modifying other properties of the clear hair styling formulation. Even more preferably, the clear hair styling formulations of the present invention further comprise 0 to 30 wt. % (preferably 0.2 to 25 wt. %, more preferably 0.5 to 15 wt. %, and most preferably 0.75 to 2 wt. %) of a thickening agent, based on the weight of the clear hair styling formulation, selected from the group consisting of synthetic polymers (e.g., polyethylene glycol, water soluble acrylic polymers, polyurethanes, polystyrenes, water soluble polyesters, polyamides, polyacrylamides, polyamines, poly(quaternary amines), styrene maleic anhydride resins, polyethyleneamines, carbomers, poloxamers, polyethyleneimines (e.g., PEI-10)), natural gums (e.g., tragacanth, carrageenan, cetyl alcohol, xanthan gum, petrolatum, waxes, bentonite, colloidal silicon dioxide), polysaccharides (e.g., cellulose, guar), salts (e.g., sodium chloride), and combinations thereof. Even more preferably, the clear hair styling formulations of the present invention further comprise 0 to 30 wt. % (preferably 0.2 to 25 wt. %, more preferably 0.5 to 15 wt. %, and most preferably 0.75 to 2 wt. %) of a thickening agent, based on the weight of the clear hair styling formulation, the thickening agent comprising at least one of a crosslinked poly((meth)acrylic acid) polymer and a hydrophobically modified crosslinked poly(meth)acrylic acid) polymer.Even more preferably, the clear hair styling formulations of the present invention further comprise 0 to 30 wt. % (preferably 0.2 to 25 wt. %, more preferably 0.5 to 15 wt. %, and most preferably 0.75 to 2 wt. %) of a thickening agent, based on the weight of the clear hair styling formulation, wherein the thickening agent is selected from (i) a crosslinked homopolymer polymerized from (meth)acrylic acid (preferably a homopolymer of (meth)acrylic acid crosslinked with an allyl ether or pentaerythritol, an allyl ether of sucrose, or an allyl ether of propylene), (ii) a first monomer selected from one or more monomers of (meth)acrylic acid, substituted (meth)acrylic acid, salts of (meth)acrylic acid, and salts of substituted acrylic acid, and one or more C of (meth)acrylic acid. 10~30 and a second monomer selected from an alkyl ester, as well as mixtures thereof. Most preferably, the clear hair styling formulations of the present invention further comprise 0 to 30 wt. % (preferably 0.2 to 25 wt. %, more preferably 0.5 to 15 wt. %, and most preferably 0.75 to 2 wt. %) of a thickener, based on the weight of the clear hair styling formulation, the thickener comprising a crosslinked homopolymer polymerized from (meth)acrylic acid (preferably a homopolymer of (meth)acrylic acid crosslinked with an allyl ether or an allyl ether of pentaerythritol, an allyl ether of sucrose, or an allyl ether of propylene).

[0024] Preferably, the clear hair styling formulations of the present invention further comprise a thickener, and the weight ratio of thickener to hair fixative polymer is from 5:95 to 95:5 (preferably from 1:1 to 1:50, more preferably from 1:5 to 1:25, and most preferably from 1:5 to 1:10).

[0025] Preferably, the clear hair styling formulation of the present invention further comprises 0 to 30% by weight (preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, most preferably 2 to 5% by weight) of a plasticizer based on the weight of the clear hair styling formulation. More preferably, the clear hair styling formulation of the present invention further comprises 0 to 30% by weight (preferably 0.5 to 20% by weight, more preferably 1 to 10% by weight, most preferably 2 to 5% by weight) of a plasticizer based on the weight of the clear hair styling formulation, the plasticizer being a dimethicone copolyol (e.g., PEG-12 dimethicone, PEG / PPG-18 / 18 dimethicone, PPG-12 dimethicone), a polyol (e.g., ethylene glycol, propylene glycol, glycerin, dipropylene glycol, sorbitol, mannose, butyl ether ... The polysaccharides are selected from the group consisting of glycerol, maltitol, lactitol, fructose, glucose, sucrose, maltose, lactose, high fructose corn syrup solids, ascorbic acid), polycarboxylic acids (e.g., citric acid, maleic acid, succinic acid, polyacrylic acid, polymaleic acid), polyesters (e.g., glycerol triacetate, acetylated monoglycerides, diethyl phthalate, triethyl citrate, tributyl citrate, acetyl triethyl citrate, acetyl tributyl citrate), and mixtures thereof. Most preferably, the clear hair styling formulations of the present invention optionally comprise 0 to 30 wt. % (preferably 0.5 to 20 wt. %, more preferably 1 to 10 wt. %, and most preferably 2 to 5 wt. %) of a plasticizer based on the weight of the clear hair styling formulation, the plasticizer comprising glycerin.

[0026] Preferably, the clear hair styling formulations of the present invention optionally contain antimicrobial / preservatives (e.g., benzoic acid, sorbic acid, phenoxyethanol, methylisothiazolinone, ethylhexylglycerin), colorants, pH adjusters, antioxidants (e.g., butylated hydroxytoluene), humectants (e.g., glycerin, sorbitol, monoglycerides, lecithin, glycolipids, fatty alcohols, fatty acids, polysaccharides, sorbitan esters, polysorbates (e.g., polysorbate 20, polysorbate 40, polysorbate 60, , and polysorbate 80), diols (e.g., propylene glycol), diol analogs, triols, triol analogs, cationic polymeric polyols), waxes, foaming agents, emulsifiers, fragrances, chelating agents (e.g., tetrasodium ethylenediaminetetraacetate), bleaches, lubricants, sensory modifiers (e.g., silicones), vitamins, bioactive agents, anti-aging additives, pigments, antistatic agents, anti-frizz agents, anti-dandruff agents, slip agents, opacifiers, pearlescent agents, and salts. More preferably, the clear hair styling formulations of the present invention optionally further comprise at least one additional ingredient selected from the group consisting of antimicrobial / preservatives, pH adjusters, fragrances, chelating agents, and salts.

[0027] Preferably, the clear hair styling formulations of the present invention optionally further comprise 0-5 wt. % (more preferably 0.05-4 wt. %, even more preferably 0.1-3 wt. %, and most preferably 0.5-2 wt. %) of an antimicrobial / preservative, based on the weight of the clear hair styling formulation. More preferably, the clear hair styling formulations of the present invention optionally further comprise 0-5 wt. % (more preferably 0.05-4 wt. %, even more preferably 0.1-3 wt. %, and most preferably 0.5-2 wt. %) of an antimicrobial / preservative, based on the weight of the clear hair styling formulation, the antimicrobial / preservative being selected from the group consisting of phenoxyethanol, ethylhexylglycerin, benzoic acid, benzyl alcohol, sodium benzoate, DMDM ​​hydantoin, 2-ethylhexylglyceryl ether, isothiazolinones (e.g., methylchloroisothiazolinone, methylisothiazolinone), and mixtures thereof. Most preferably, the clear hair styling formulations of the present invention optionally further comprise 0-5 wt. % (more preferably 0.05-4 wt. %, even more preferably 0.1-3 wt. %, and most preferably 0.5-2 wt. %) of an antimicrobial / preservative, based on the weight of the clear hair styling formulation, wherein the antimicrobial / preservative is a mixture selected from the group consisting of (a) phenoxyethanol and ethylhexylglycerin, and (b) phenoxyethanol and an isothiazolinone (more preferably, the antimicrobial / preservative is a mixture selected from the group consisting of (a) phenoxyethanol and ethylhexylglycerin, and (b) phenoxyethanol and methylisothiazolinone, and most preferably, the antimicrobial / preservative is a mixture of phenoxyethanol and ethylhexylglycerin).

[0028] Preferably, the clear hair styling formulation of the present invention optionally further comprises 0-5% by weight (preferably 0.1-4%, more preferably 0.5-3%, most preferably 0.75-2%) of a pH adjuster based on the weight of the clear hair styling formulation. More preferably, the clear hair styling formulation of the present invention optionally further comprises 0-5% by weight (preferably 0.1-4%, more preferably 0.5-3%, most preferably 0.75-2%) of a pH adjuster based on the weight of the clear hair styling formulation, and the clear hair styling formulation has a pH of 4-9 (preferably 4.25-8, more preferably 5-8, most preferably 6.5-8).

[0029] Preferably, the pH adjuster is selected from the group consisting of at least one of citric acid, lactic acid, hydrochloric acid, aminoethylpropanediol, triethanolamine, monoethanolamine, sodium hydroxide, potassium hydroxide, and amino-2-methyl-1-propanol. More preferably, the pH adjuster is selected from the group consisting of at least one of citric acid, lactic acid, sodium hydroxide, potassium hydroxide, triethanolamine, and amino-2-methyl-1-propanol. Even more preferably, the pH adjuster includes triethanolamine. Most preferably, the pH adjuster is triethanolamine.

[0030] Preferably, the clear hair styling formulations of the present invention contain less than 0.1% (preferably less than 0.01%, more preferably less than 0.001%, and most preferably below the detection limit) of copolymer (comprising structural units of maltodextrin and structural units of n-vinylpyrrolidone) based on the weight of the clear hair styling formulation.

[0031] Preferably, the clear hair styling formulations of the present invention contain less than 0.1% (preferably less than 0.01%, more preferably less than 0.001%, and most preferably below the limit of detection) of copolymers (containing structural units of fructan polysaccharides) based on the weight of the clear hair styling formulation.

[0032] Preferably, the clear hair styling formulations of the present invention contain less than 0.1% (preferably less than 0.01%, more preferably less than 0.001%, and most preferably below the detection limit) of copolymers (containing maltodextrin structural units and dextrin structural units) based on the weight of the clear hair styling formulation.

[0033] Preferably, the clear hair styling formulations of the present invention contain less than 0.1% (preferably less than 0.01%, more preferably less than 0.001%, and most preferably below the detection limit) of copolymers (including maltodextrin structural units and maltodextrin structural units) based on the weight of the clear hair styling formulation.

[0034] Preferably, the method of styling hair of the present invention comprises selecting a clear hair styling formulation of the present invention, applying the clear hair styling formulation to hair (preferably mammalian hair, most preferably human hair), and styling the hair (e.g., rolling the hair, curling the hair with an iron, flattening the hair with an iron). More preferably, the method of styling hair of the present invention comprises selecting a clear hair styling formulation of the present invention, wetting the hair (preferably mammalian hair, most preferably human hair) with water, applying the selected clear hair styling formulation to the wetted hair, and styling the hair (e.g., rolling the hair, curling the hair with an iron, flattening the hair with an iron). Most preferably, the method of styling hair of the present invention comprises selecting a clear hair styling formulation of the present invention, providing a shampoo, providing the shampoo to hair (preferably mammalian hair, more preferably human hair), applying the shampoo to the hair, rinsing the shampoo from the hair with water to provide clean hair, applying the selected clear hair styling formulation to the clean hair, and styling the hair (e.g., running the hair through rollers, curling the hair with an iron, flattening the hair with an iron).

[0035] Preferably, the method of styling hair of the present invention imparts a style to the hair with high humidity curl retention. More preferably, the method of styling hair of the present invention imparts a style to the hair with high humidity curl retention of greater than 50% (preferably greater than 75%, more preferably greater than 80%, and most preferably greater than 90%) after 8 hours in an environment of 25°C and 90% relative humidity.

[0036] Some embodiments of the present invention will now be described in detail in the following examples.

[0037] Synthetic S1-S6: Extruded hydrolyzed starch The base starch was processed by a reactive extrusion process using high shear forces. The base starch was processed by a reactive extrusion process using acid hydrolysis to provide hydrolyzed starch with molecular weights and polydispersities shown in Table 2.

[0038] Molecular weight analysis was performed by GPC as follows.

[0039] Sample preparation: Starch samples were first dissolved in DMSO at 50 mg / mL and heated at 70° C. for 1 hour or until the solution was clear. The DMSO starch solutions were then further diluted to concentrations of 0.5-5 mg / mL with 20 mM NaCl solution at pH 11. The final test solutions were filtered through 0.45 μm syringe-top PVDF filters prior to GPC analysis.

[0040] Equipment: Waters 2690 system consisting of pump, degasser, autosampler, column oven, and 2414 RI detector operated at 40° C. System control, data acquisition, and data processing were performed using Empower® 3 software (Waters, Milford, Mass.).

[0041] The GPC method used is as shown in Table 1. [Table 1] [Table 2]

[0042] Transparency of starch solution Aqueous solutions (3% by weight) of the ingredients shown in Table 3 were prepared in deionized water. A turbidity meter was used to measure the turbidity of each of the resulting aqueous solutions. The instrument was calibrated according to the instructions included with the machine. A portion of the formulated product was slowly transferred to a clean glass vial. The glass vial was then centrifuged at 2.5 rpm for 10 minutes to remove air bubbles. The sample was placed in the measurement column of the turbidity meter and allowed to settle, after which the turbidity of the sample was measured and recorded as shown in Table 3. [Table 3]

[0043] Clarity of aqueous blends of starch and carbomer. Aqueous blends containing the ingredients shown in Table 4 (3 wt%) and carbomer (1 wt%) (CARBOPOL 980 from Lubrizol) were prepared in deionized water. The turbidity of the resulting aqueous blends was measured using a turbidimeter. The instrument was calibrated according to the instructions included with the machine. The instrument was calibrated according to the instructions included with the machine. A portion of the compounded product was slowly transferred to a clean glass vial. The glass vial was then centrifuged at 2.5 rpm for 10 minutes to remove air bubbles. The sample was placed in the measurement column of the turbidimeter and allowed to settle, after which the turbidity of the sample was measured and recorded as shown in Table 4. [Table 4]

[0044] Comparative Examples C1-C4 and Examples 1-7: Hair Gel Formulations Hair gel formulations according to Comparative Examples C1-C4 and Examples 1-7 were prepared having the components shown in Table 5. In each of Comparative Examples C1-C4 and Examples 1-7, deionized water (50 g) was weighed into a 400 mL beaker equipped with a stir bar. The beaker was placed on a magnetic stirrer and set to stir at 500 rpm. Carbomer (Carbopol 980 from Lubrizol) (1 g) was then added to the contents of the beaker and stirring continued until dispersed, at which point the stirrer setting was reduced to 200 rpm to remove any air bubbles.

[0045] Deionized water (39.9 g) was weighed into a 150 mL flask equipped with a stir bar. The flask was then placed on a magnetic stirrer and set to stir. Disodium ethylenediaminetetraacetate (0.1 g) was added to the flask contents. Once the disodium ethylenediaminetetraacetate had dissolved, glycerin (3 g) was added to the flask contents. A hair fixative polymer (5 g) as shown in Table 5 was then added to the flask contents. Once the solution in the flask was clear, preservative (Euxyl PE 9010 from Ashland) (1 g) was added to the flask contents.

[0046] The contents of the flask were slowly added to the contents of the beaker over a period of 2 minutes with continued stirring, and the contents of the beaker were pH adjusted to 7-7.5 by the addition of triethanolamine to provide the product hair gel formulation. [Table 5]

[0047] High humidity curl retention Hair tresses (medium to dark brown virgin hair obtained from International Hair Importers) with an average length of 8 inches (before curling) and weighing 3.5 g were used for the curl retention experiments. The tresses were washed using a 9% sodium lauryl sulfate SLS solution and dried overnight in a temperature controlled room. The tresses were then treated with a hair gel formulation (0.35 g) according to one of Comparative Examples C1-C4 and Examples 1-7, before being wet curled on 22 mm x 70 mm curlers and pinned in place. After drying, the curlers were gently removed from the tresses and the curls were hung by clips in a humidity chamber at 25°C and 90% relative humidity. The initial curl length was recorded. The length of the curled tresses was then recorded after 8 hours. Curl retention is defined as [(L(0)-L(t)) / (L(0)-L(i))]×100%, where L(0) is the fully extended tress length, L(i) is the initial curl length, and L(t) is the curl length after 8 hours. Higher values ​​of curl retention correspond to better humidity performance. The curl retention observed for the hair gel formulations is reported in Table 6. [Table 6]

Claims

1. 1. A clear hair styling formulation comprising: A dermatologically acceptable vehicle; A hair fixative polymer, said hair fixative polymer being hydrolyzed starch; a hair fixative polymer, wherein the hydrolyzed starch has a weight average molecular weight of 5,000 to 50,000 Daltons.

2. 10. The clear hair styling formulation of claim 1 further comprising a thickening agent.

3. 3. The clear hair styling formulation of claim 2 further comprising a plasticizer.

4. 4. The clear hair styling formulation of claim 3, wherein said clear hair styling formulation has a turbidity of 0 to 20 Nephelometric Turbidity Units (NTU) when measured by nephelometry at a concentration of 1% by weight of hair fixative polymer and a pH of 7 to 7.

5.

5. 5. The clear hair styling formulation of claim 4, wherein the thickening agent is selected from the group consisting of crosslinked poly(acrylic acid) polymers, hydrophobically modified crosslinked poly(acrylic acid) polymers, and mixtures thereof.

6. 6. The clear hair styling formulation of claim 5, wherein the thickening agent is a crosslinked poly(acrylic acid) polymer.

7. 7. The clear hair styling formulation of claim 6, wherein the weight ratio of thickener to hair fixative polymer is from 1:5 to 1:

25.

8. 8. The clear hair styling formulation of claim 7, further comprising an additive selected from the group consisting of antimicrobials / preservatives, soaps, colorants, pH adjusters, antioxidants, moisturizers, waxes, foaming agents, emulsifiers, colorants, fragrances, chelating agents, bleaches, lubricants, sensory modifiers, vitamins, bioactive agents, pigments, antistatic agents, anti-frizz agents, anti-dandruff agents, slip agents, opacifying agents, pearlescent agents, and salts.

9. 9. The transparent hair styling formulation of claim 8, wherein the transparent hair styling formulation is selected from the group consisting of hair sprays, hair fixatives, hair mousses, hair gels / creams / pastes, hair volumizing compositions, leave-in hair creams, hair masks, hair lotions, hair serums, hair oils, hair clays, hair pomades, hair waxes, hair powders, and dry shampoos.

10. 1. A method of styling hair, comprising: Providing a clear hair styling formulation according to claim 1; applying said clear hair styling formulation to hair; and providing a style to said hair.

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