Process to reduce hair damage when exposed to heat

Abstract

1. A process for reducing hair damage upon exposure to heat, the process comprising: providing an aqueous carrier; selecting a thermal protectant, the thermal protectant being selected for its ability to impart thermal protection to hair and being a modified carbohydrate polymer, the thermal protectant comprising a cellulose ether base functionalized with a trialkylammonium moiety having a Kjeldahl nitrogen content of 0.75 to 2.5 wt. % and a hydrophobic substituent having 16 carbon atoms; providing the selected thermal protectant; combining the thermal protectant with a cosmetically acceptable aqueous carrier to form an aqueous thermal protectant formulation, the aqueous thermal protectant formulation containing 0.1 to 5 wt. % of the thermal protectant, based on the weight of the aqueous thermal protectant formulation; providing hair; applying the aqueous thermal protectant formulation to the hair; providing a heat-generating hair care appliance; and exposing the hair to heat at 50 to 300°C for 1 to 30 minutes using the heat-generating hair care appliance.

Description

[Technical Field]

[0001] The present invention relates to a process for reducing hair damage when hair is exposed to heat. Specifically, the present invention relates to a process for reducing hair damage when hair is exposed to heat, the process for providing a cosmetically acceptable aqueous carrier and the selection of a heat protectant, the heat protectant being selected based on its ability to provide heat protection to the hair from heat exposure, the heat protectant being selected to be a modified carbohydrate polymer, the modified carbohydrate polymer being (i) a trialkylammonium moiety of formula (I),

[0002] [ka] (In the formula, each R 1 Independently, C 1~7 (ii) a modified carbohydrate polymer selected from the group consisting of alkyl groups, wherein the modified carbohydrate polymer has a Kjeldahl nitrogen content (TKN) corrected for ash and volatile substances of 0.75 to 2.5% by weight, and (ii) a cellulose ether substrate functionalized with hydrophobic substituents, each having 16 carbon atoms, wherein the modified carbohydrate polymer contains 0.005 to 1.5% by weight of hydrophobic substituents based on the weight of the cellulose ether substrate, the hydrophobic substituents are randomly distributed throughout the backbone of the cellulose ether substrate, and the cellulose ether substrate has a weight-average molecular weight M of >1,000,000 daltons. W The process comprises selecting a modified carbohydrate polymer having <0.001% by weight of crosslinking units based on the weight of the modified carbohydrate polymer, providing a selected thermal protectant, forming an aqueous thermal protectant formulation by combining a cosmetically acceptable aqueous carrier and a thermal protectant, wherein the aqueous thermal protectant formulation contains 0.1 to 5% by weight of the thermal protectant based on the weight of the aqueous thermal protectant formulation, providing hair, applying the aqueous thermal protectant formulation to the hair, providing a heat-generating hair care device, and exposing the hair to heat of 50 to 300°C for 1 to 30 minutes using the heat-generating hair care device.

[0003] Heat-assisted styling or drying processes that apply heat to hair fibers (e.g., using a blow dryer, straightener (such as a flat iron), curling device, heated comb, or heated brush (with or without a rotating drum)) are ubiquitous. However, such heat-assisted processes can dry out and damage hair. Furthermore, improper techniques, such as holding a blow dryer too close to the hair and over-drying it, or applying a hot tool to a specific area of ​​hair for too long, can cause damage. Heat-assisted processes make hair brittle and more susceptible to cracking as moisture evaporates or is pushed out of it. In addition, heat styling can cause physical damage to the hair. For example, it can cause increased friction between hair fibers by lifting the cuticle and / or creating blisters on individual hair fibers. Increased friction between hair fibers makes it harder to comb, requiring more force to comb the hair. Applying increased combing force can, in turn, wear down the outer surface of the hair, potentially causing cracks and breakage. For many years, researchers have believed that human hair, being composed of keratin protein, possesses similar temperature-based properties to wool. Recent studies have revealed that human hair exhibits the following characteristics in response to heating: (a) When exposed to heat ≤ 150°C, loosely bound and tightly bound water is lost from or evaporates from human hair. (b) When exposed to heat between 160°C and 175°C, human hair undergoes a glass transition. The hair begins to flow like high-temperature glass. At the glass transition temperature, the hair can undergo plastic deformation. Normally, hydrated hair can be elastically stretched and returned to its original length. Thus, normal hydrated hair exhibits temporary plasticity, which can result in curl-like styles and twists / tangles. However, when treated above the glass transition temperature, the plasticity of the hair is not temporary. When cooled, hair may retain its style, but the hair shaft is damaged.(c) When exposed to heat at 215°C to 235°C, keratin, which is naturally present in all hair as an alpha helix, melts, thereby permanently damaging the hair. It should be noted that hair styling is typically done using tools that exhibit operating temperatures above 150°C, imparting style to the hair beyond the glass transition. When using heat to style hair, the temperature required to exceed the glass transition temperature is proportional to the hair's hydration level. The higher the water content of the hair, the lower the temperature required to reach the hair's glass transition point. Therefore, it would be advantageous to maximize hair hydration during the heat-assisted styling process to minimize the level of undesirable damage to the hair.

[0004] One process for treating keratin fibers is described by Greaves et al. in WO2019043032. Greaves et al. disclose a process for treating keratin fibers, in particular human keratin fibers, in particular hair, comprising: (i) a step of coating the fibers with a) one or more monosaccharides having an amine group; (ii) a step of coating the fibers with b) one or more polysaccharides having an amine group; (ii') optionally a drying step; and (iii) then preferably a heat treatment step of 80°C or higher, in particular 100°C to 250°C, using a hair iron, wherein steps (i) and (ii) may be carried out simultaneously or sequentially, preferably steps (i) and (ii) are carried out simultaneously, and if present, the drying step (ii') precedes the heat treatment step and follows steps (i) and (ii).

[0005] Nevertheless, processes to reduce hair damage when hair is exposed to heat are still needed.

[0006] The present invention relates to a process for reducing hair damage when hair is exposed to heat, providing a cosmetically acceptable aqueous carrier and selecting a heat protectant, wherein the heat protectant is selected based on its ability to provide heat protection to the hair from heat exposure, and (i) the trialkylammonium moiety of formula (I),

[0007] [ka] (In the formula, each R 1 Independently, C 1~7 (ii) a modified carbohydrate polymer selected from the group consisting of alkyl groups, wherein the modified carbohydrate polymer has a Kjeldahl nitrogen content (TKN) corrected for ash and volatile substances of 0.75 to 2.5% by weight, and (ii) a hydrophobic substituent, each having 16 carbon atoms, comprising a cellulose ether substrate functionalized with (ii) a hydrophobic substituent, wherein the modified carbohydrate polymer contains 0.005 to 1.5% by weight of the hydrophobic substituent based on the weight of the cellulose ether substrate, wherein the hydrophobic substituent is randomly distributed throughout the backbone of the cellulose ether substrate, and the cellulose ether substrate has a weight-average molecular weight M of >1,000,000 daltons. W The process includes: selecting a modified carbohydrate polymer having <0.001% by weight of crosslinking units based on the weight of the modified carbohydrate polymer; providing a selected thermal protectant; forming an aqueous thermal protectant formulation by combining a cosmetically acceptable aqueous carrier and a thermal protectant, wherein the aqueous thermal protectant formulation contains 0.1 to 5% by weight of the thermal protectant based on the weight of the aqueous thermal protectant formulation; providing hair; applying the aqueous thermal protectant formulation to the hair; providing a heat-generating hair care device; and exposing the hair to heat of 50 to 300°C for 1 to 30 minutes using the heat-generating hair care device. [Modes for carrying out the invention]

[0008] The inventors have surprisingly found hair that has been treated with the aqueous heat protection agent formulation of the present invention before being exposed to heat. The aqueous heat protection agent formulation contains a selected heat protection agent, which is selected based on its ability to impart heat protection to the hair from heat exposure, and the heat protection agent is selected to be a modified carbohydrate polymer. (i) a trialkylammonium moiety of formula (I),

[0009] [Chemical formula] (where each R 1 is independently selected from the group consisting of C 1~7 alkyl groups, and the modified carbohydrate polymer has a Kjeldahl nitrogen content TKN corrected for ash and volatiles of 0.75 to 2.5% by weight) and (ii) a hydrophobic substituent having 16 carbon atoms each, and comprises a cellulose ether substrate functionalized with, the modified carbohydrate polymer contains 0.005 to 1.5% by weight of hydrophobic substituents based on the weight of the cellulose ether substrate, the hydrophobic substituents are randomly distributed throughout the backbone of the cellulose ether substrate, the cellulose ether substrate has a weight average molecular weight M W of > 1,000,000 daltons, the modified carbohydrate polymer contains <0.001% by weight of cross-linked units based on the weight of the modified carbohydrate polymer, and the treated hair exhibits at least one of a higher denaturation temperature and a higher denaturation enthalpy than hair that is similarly exposed to heat but not coated with the aqueous protective agent formulation.

[0010] Unless otherwise indicated, ratios, percentages, parts, etc. are by weight.

[0011] As used herein, unless otherwise indicated, "molecular weight" or M WThe term refers to the weight average molecular weight measured by conventional methods using conventional standards such as gel permeation chromatography (GPC) and polyethylene glycol standards. The technique of GPC is described in detail in Modern Size Exclusion Chromatography, W.W. Yau, J.J. Kirkland, D.D. Bly; Wiley-Interscience, 1979 and in A Guide to Materials Characterization and Chemical Analysis, J.P. Sibilia; VCH, 1988, pp. 81-84. Molecular weight is reported herein in units of daltons or equivalently g / mol.

[0012] As used herein and in the appended claims, the term "cosmetically acceptable" refers to ingredients typically used in personal care compositions, and is intended to emphasize that materials that are toxic when present in amounts typically found in personal care compositions are not contemplated as part of the present invention.

[0013] Preferably, a process for reducing hair (preferably mammalian hair, more preferably human hair) damage upon thermal exposure of the hair of the present invention comprises providing a cosmetically acceptable aqueous carrier and selecting a heat protectant, wherein the heat protectant is selected based on its ability to impart heat protection to the hair from thermal exposure, the heat protectant is selected to be a modified carbohydrate polymer, and the modified carbohydrate polymer has (i) a trialkylammonium moiety of formula (I),

[0014] [Chem.] (where each R 1 is independently a C 1~7 alkyl group (preferably a C 1~4(ii) an alkyl group, more preferably a methyl group and an ethyl group, most preferably a methyl group, selected from the group consisting of alkyl groups, the modified carbohydrate polymer comprises a cellulose ether substrate functionalized with (ii) a Kjeldahl nitrogen content TKN corrected for ash and volatile substances of 0.75 to 2.5% by weight (preferably 0.8 to 2.2% by weight, more preferably 1.5 to 2.1% by weight, most preferably 1.7 to 1.9% by weight), and (ii) a hydrophobic substituent, each having 16 carbon atoms, wherein the modified carbohydrate polymer is present in a weight of >0.005 to 1.5% by weight (preferably 0) based on the weight of the cellulose ether substrate. The polymer contains 0.1 to 1.1% by weight, more preferably 0.2 to 0.7%, even more preferably 0.3 to <0.5% by weight, most preferably 0.4 to 0.46% by weight) of hydrophobic substituents, the hydrophobic substituents being randomly distributed throughout the backbone of the cellulose ether substrate, and the cellulose ether substrate having a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, most preferably 1,300,000 to 1,800,000 daltons) based on the weight of the modified carbohydrate polymer. WThe invention provides a selected thermal protectant having a modified carbohydrate polymer containing <0.001% by weight (preferably <0.0001% by weight, more preferably <0.00001% by weight, most preferably less than the detection limit) of crosslinking units, and a combination of a cosmetically acceptable aqueous carrier and a thermal protectant to form an aqueous thermal protectant formulation (preferably the aqueous thermal protectant formulation is 25 to 99.95% by weight (preferably 50 to 99.9% by weight, more preferably 75 to 99.5% by weight, most preferably) based on the weight of the aqueous thermal protectant formulation. The method involves providing hair, a hair, and applying the aqueous heat protectant formulation to the hair (preferably applying 0.01g to 5g of the aqueous hair care formulation per gram of hair), and optionally rinsing the hair with water (preferably rinsing the hair before applying the aqueous protectant formulation to the hair), and optionally Optionally, the rinsed hair is dried to remove excess water by at least one of towel-drying and pressing the hair (preferably, the hair is dried to remove excess water by at least one of towel-drying and pressing the hair before applying the aqueous protective agent formulation to the hair), and optionally, the hair is combed and brushed after applying the aqueous heat protective agent formulation (preferably, the hair is combed and brushed before, during, and / or after, exposure of the hair to heat from a heat-generating hair care device). To provide a hair care device that generates heat (for example, to comb and / or brush hair, to set and heat hair in a curler, to curl hair with a curling iron and hot roller) (a hair styling device selected from the group consisting of at least one of a hair dryer, a hot air hair styling device and a hair curler), and to heat hair to a temperature of 50 to 300°C (preferably 80 to 280°C, more preferably 90 to 275°C, most preferably 100 to 250°C),The method includes exposing the hair to heat for 1 to 30 minutes using a heat-generating hair care device (the heat-generating hair care device is selected from the group consisting of at least one of hot air health devices (e.g., hair dryers, hot air hair styling devices) and high-temperature surface hair care devices (e.g., hot curlers, flat irons, and curling irons)) (for example, to dry or style the hair) (preferably, providing a hot air hair care device and a high-temperature surface hair care device for 1 to 20 minutes to dry the hair, followed by treating the hair with a high-temperature surface hair care device for 1 to 20 minutes to style the hair) (preferably, the hair coated with the aqueous protective agent formulation exhibits at least one of a higher denaturation temperature and a higher denaturation enthalpy than hair similarly exposed to heat but not coated with the aqueous protective agent formulation) (more preferably, the hair coated with the aqueous protective agent formulation exhibits a higher denaturation temperature and a higher denaturation enthalpy than hair similarly exposed to heat but not coated with the aqueous protective agent formulation).

[0015] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention includes a cosmetic-grade aqueous carrier. More preferably, the aqueous thermal protective agent formulation provided and used in the process of the present invention includes 25 to 99.95% by weight (preferably 50 to 99.9% by weight, more preferably 75 to 99.5% by weight, more preferably 80 to 99.3% by weight) of a cosmetic-grade aqueous carrier, based on the weight of the aqueous thermal protective agent formulation. Most preferably, the aqueous conditioner formulation of the present invention includes 25 to 99.95% by weight (preferably 50 to 99.9% by weight, more preferably 75 to 99.5% by weight, more preferably 80 to 99.3% by weight) of a cosmetic-grade aqueous carrier, based on the weight of the aqueous thermal protective agent formulation, wherein the cosmetic-grade carrier includes water.

[0016] Preferably, the water used in the aqueous thermal protective agent formulation prepared and used in the process of the present invention is at least one of distilled water and deionized water. More preferably, the water used in the aqueous thermal protective agent formulation prepared and used in the process of the present invention is distilled and deionized.

[0017] Preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention comprises a heat protectant. More preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention comprises a heat protectant, and the aqueous heat protectant formulation prepared and used in the process of the present invention comprises 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the heat protectant based on the weight of the aqueous heat protectant formulation. Most preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention comprises 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the heat protectant based on the weight of the aqueous heat protectant formulation, the heat protectant is selected based on its ability to provide heat protection to the hair from exposure to heat, the heat protectant is selected to be a modified carbohydrate polymer, the modified carbohydrate polymer is (i) the trialkylammonium moiety of formula (I),

[0018] [ka] (Each R 1 Independently, C 1~7 Alkyl alkyl group (preferably C 1~4(ii) a hydrophobic substituent comprising a cellulose ether substrate functionalized with a hydrophobic substituent comprising an alkyl group, more preferably a methyl group and an ethyl group, most preferably a methyl group), selected from the group consisting of alkyl groups, more preferably a methyl group and an ethyl group, most preferably a methyl group), and (ii) a Kjeldahl nitrogen content TKN corrected for ash and volatile substances of 0.75 to 2.5% by weight (preferably 0.8 to 2.2% by weight, more preferably 1.5 to 2.1% by weight, most preferably 1.7 to 1.9% by weight), and (ii) a hydrophobic substituent comprising an alkyl group having 16 carbon atoms, wherein the modified carbohydrate polymer has a weight of >0.005 to 1 based on the weight of the cellulose ether substrate. The polymer contains 5% by weight (preferably 0.1 to 1.1% by weight, more preferably 0.2 to 0.7%, even more preferably 0.3 to <0.5% by weight, most preferably 0.4 to 0.46% by weight) of hydrophobic substituents, the hydrophobic substituents being randomly distributed throughout the backbone of the cellulose ether substrate, and the cellulose ether substrate has a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, most preferably 1,300,000 to 1,800,000 daltons) based on the weight of the modified carbohydrate polymer. W The modified carbohydrate polymer has <0.001% by weight (preferably <0.0001% by weight, more preferably <0.00001% by weight, most preferably less than the detection limit) of crosslinking units.

[0019] Preferably, the cellulose ether base material has a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, and most preferably 1,300,000 to 1,800,000 daltons). W It has the following characteristics. More preferably, the cellulose ether base material has a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, most preferably 1,300,000 to 1,800,000 daltons). WThe cellulose ether base material is selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose, ethylhydroxyethylcellulose, methylcellulose, hydroxypropylmethylcellulose, hydroxyethylmethylcellulose, and mixtures thereof. More preferably, the cellulose ether base material has a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, most preferably 1,300,000 to 1,800,000 daltons). W The cellulose ether base material is selected from the group consisting of hydroxyethylcellulose, hydroxypropylcellulose, and mixtures thereof. Most preferably, the cellulose ether base material has a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, most preferably 1,300,000 to 1,800,000 daltons). W The cellulose ether base material is hydroxyethylcellulose.

[0020] Preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention comprises a heat protectant, and the aqueous heat protectant formulation prepared and used in the process of the present invention comprises 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the heat protectant based on the weight of the aqueous heat protectant formulation, the heat protectant is selected based on its ability to provide heat protection to the hair from exposure to heat, the heat protectant is selected to be a modified carbohydrate polymer, the modified carbohydrate polymer comprises a cellulose ether base functionalized with a trialkylammonium moiety of formula (I), where each R 1 C 1~7 Alkyl alkyl group (preferably C 1~4The modified carbohydrate polymer is selected from the group consisting of alkyl groups, more preferably methyl and ethyl groups, most preferably methyl groups), and has a Kjeldahl nitrogen content (TKN) corrected for ash and volatile substances of 0.75 to 2.5% by weight (preferably 0.8 to 2.2% by weight, more preferably 1.5 to 2.1% by weight, most preferably 1.7 to 1.9% by weight). More preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention comprises a heat protectant, and the aqueous heat protectant formulation prepared and used in the process of the present invention comprises 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the heat protectant based on the weight of the aqueous heat protectant formulation, the heat protectant is selected based on its ability to provide heat protection to the hair from exposure to heat, the heat protectant is selected to be a modified carbohydrate polymer, the modified carbohydrate polymer comprises (i) a cellulose ether base functionalized with the trialkylammonium moiety of formula (I), and each R 1 Independently, C 1~7 Alkyl alkyl group (preferably C 1~4 The modified carbohydrate polymer is selected from the group consisting of alkyl groups, more preferably methyl and ethyl groups, most preferably methyl groups), and has a Kjeldahl nitrogen content (TKN) corrected for ash and volatile substances of 0.75 to 2.5% by weight (preferably 0.8 to 2.2% by weight, more preferably 1.5 to 2.1% by weight, most preferably 1.7 to 1.9% by weight). The modified carbohydrate polymer contains a trialkylammonium moiety having formula (II) per mole of cellulose ether substrate in an amount of <0.1 mole (preferably <0.01 mole, more preferably <0.001 mole, most preferably less than the detection limit).

[0021] [ka] In the formula, each R 2 R is independently selected from methyl and ethyl groups. 3 C 8~30 Selected from alkyl groups.

[0022] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention comprises a thermal protective agent, comprising 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the thermal protective agent based on the weight of the aqueous thermal protective agent formulation, the thermal protective agent being selected based on its ability to provide thermal protection from exposure to heat, the thermal protective agent being selected to be a modified carbohydrate polymer, the modified carbohydrate polymer comprising (ii) a cellulose ether substrate functionalized with a hydrophobic substituent, the hydrophobic substituent comprising an alkyl group having 16 carbon atoms, and the modified carbohydrate polymer comprising >0.005 to 1.5% by weight (preferably 0.1 to 1.1% by weight, more preferably 0.2 to 0.7%, even more preferably 0.3 to <0.5% by weight, most preferably 0.4 to 0.46% by weight) of the hydrophobic substituent based on the weight of the cellulose ether substrate. More preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention comprises a thermal protective agent, comprising 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the thermal protective agent based on the weight of the aqueous thermal protective agent formulation, the thermal protective agent being selected based on its ability to provide thermal protection from exposure to heat, the thermal protective agent being selected to be a modified carbohydrate polymer, the modified carbohydrate polymer being (ii) functionalized with a hydrophobic substituent The modified carbohydrate polymer comprises a cellulose ether substrate, wherein the hydrophobic substituent comprises an alkyl group having 16 carbon atoms bonded to the cellulose ether substrate through at least one of ether bonds (e.g., ether bonds only or ether bonds and a 2-hydroxypropyl group) and ester bonds, and the modified carbohydrate polymer contains >0.005 to 1.5% by weight (preferably 0.1 to 1.1% by weight, more preferably 0.2 to 0.7%, even more preferably 0.3 to <0.5% by weight, most preferably 0.4 to 0.46% by weight) based on the weight of the cellulose ether substrate.More preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention comprises a thermal protective agent, wherein the aqueous thermal protective agent formulation prepared and used in the process of the present invention comprises 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the thermal protective agent based on the weight of the aqueous thermal protective agent formulation, the thermal protective agent is selected based on its ability to provide thermal protection to the hair from exposure to heat, the thermal protective agent is selected to be a modified carbohydrate polymer, the modified carbohydrate polymer comprises (ii) a cellulose ether substrate functionalized with a hydrophobic substituent, and is hydrophobic The hydrophobic substituents include an alkyl group having 16 carbon atoms bonded to the water-soluble cellulose ether substrate through at least one of ether bonds (e.g., ether bonds only or ether bonds and a 2-hydroxypropyl group) and ester bonds, and the modified carbohydrate polymer contains >0.005 to 1.5% by weight (preferably 0.1 to 1.1% by weight, more preferably 0.2 to 0.7%, even more preferably 0.3 to <0.5% by weight, most preferably 0.4 to 0.46% by weight) of hydrophobic substituents based on the weight of the cellulose ether substrate, and the hydrophobic groups are randomly distributed throughout the backbone of the cellulose ether substrate.Most preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention comprises a heat protectant, and the aqueous heat protectant formulation prepared and used in the process of the present invention comprises 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of the heat protectant based on the weight of the aqueous heat protectant formulation, the heat protectant is selected based on its ability to provide heat protection to the hair from exposure to heat, the heat protectant is selected to be a modified carbohydrate polymer, the modified carbohydrate polymer is (ii) cellulose A functionalized with a hydrophobic substituent The modified carbohydrate polymer contains a cellulose ether substrate, and the hydrophobic substituent comprises an alkyl group having 16 carbon atoms bonded to the water-soluble cellulose ether substrate through an ether bond or at least one of an ether bond and a 2-hydroxypropyl group, and the modified carbohydrate polymer contains >0.005 to 1.5% by weight (preferably 0.1 to 1.1% by weight, more preferably 0.2 to 0.7%, even more preferably 0.3 to <0.5% by weight, most preferably 0.4 to 0.46% by weight) of hydrophobic substituents based on the weight of the cellulose ether substrate, and the hydrophobic groups are randomly distributed throughout the backbone of the cellulose ether substrate.

[0023] Preferably, the modified carbohydrate polymer is of formula (III),

[0024] [ka] In the formula, n is the weight-average molecular weight M of the cellulose ether substrate. w Determined based on, in the formula, R 4 It is an alkyl group having 16 carbon atoms, and each R 5 C 1~7 Alkyl alkyl group (preferably C 1~4The cellulose ether substrate is selected from the group consisting of alkyl groups, more preferably methyl and ethyl groups, most preferably methyl groups), and has a weight-average molecular weight M of >1,000,000 daltons (preferably 1,100,000 to 4,000,000 daltons, more preferably 1,200,000 to 2,000,000 daltons, most preferably 1,300,000 to 1,800,000 daltons). W The modified carbohydrate polymer has <0.001% by weight (preferably <0.0001% by weight, more preferably 0.00001% by weight, most preferably less than the detection limit) of crosslinking units.

[0025] Preferably, the aqueous heat-protective agent formulation prepared and used in the process of the present invention is selected from the group consisting of rinse-off hair treatments and leave-in hair treatments. More preferably, the aqueous heat-protective agent formulation prepared and used in the process of the present invention is a leave-in hair treatment.

[0026] Preferably, the aqueous heat-protective agent formulation prepared and used in the process of the present invention may optionally contain a cosmetically acceptable cleansing surfactant, a thickener (e.g., polysaccharides, cellulose polymers), a soap, a colorant, a pH adjuster, an antioxidant (e.g., butylated hydroxytoluene), or a skin emollient (polyoxyethylene glycol (C)). 7~20) Fatty acids, glycerol esters (e.g., PEG-7 glyceryl cocoate, PEG-30 glyceryl cocoate, PEG-12 glyceryl laurate, PEG-20 glyceryl oleate), waxes, foaming agents, emulsifiers (e.g., PEG-100 stearate and glyceryl stearate mixture), colorants, fragrances, chelating agents (e.g., disodium EDTA, tetrasodium EDTA, citric acid, lactic acid), antibacterial / preservatives (e.g., methylchloroisothiazolinone, phenoxyethanol, methylisothiazolinone, parabenzoic acid ester, diazolidinyl) The present invention further comprises at least one additional ingredient selected from the group consisting of urea, and imidazolidinyl urea, benzoic acid, sorbic acid), bleaching agents, lubricants, sensory modifiers, sunscreen additives, vitamins, proteins / amino acids, plant extracts, natural ingredients, bioactives, antioxidants, pigments; acids, penetrating agents, antistatic agents, anti-frizzy agents, anti-dandruff agents, hair weaving / straightening agents, hair styling agents, hair oils, absorbents, hard particles, soft particles, conditioning agents (e.g., guar hydroxypropyltrimonium chloride, PQ-10, PQ-7), slippery agents, opacifiers, pearlescent agents, and salts. More preferably, the aqueous heat-protective agent formulations prepared and used in the process of the present invention further optionally include at least one additional component selected from the group consisting of emulsifiers (e.g., a mixture of PEG-100 stearate and glyceryl stearate), antimicrobial agents / preservatives (e.g., methylchloroisothiazolinone, phenoxyethanol, methylisothiazolinone, esters of parabenzoic acid, diazolidinyl urea, and imidazolidinyl urea, benzoic acid, sorbic acid), thickeners (e.g., polysaccharides, cellulosic polymers), and chelating agents (e.g., disodium EDTA, tetrasodium EDTA, citric acid, lactic acid). Most preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention further optionally comprises at least one additional component selected from the group consisting of an emulsifier mixture with PEG-100 stearate and glyceryl stearate mixture, a hydroxyethyl cellulose polymer thickener, a cetearyl alcohol esterifying agent, tetrasodium ethylenediaminetetraacetic acid chelating agent, and a mixture of phenoxyethanol and methylisothiazolinone preservative.

[0027] Preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention further optionally comprises an emulsifier. More preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention further comprises 0.01 to 80% by weight (preferably 0.1 to 5% by weight, even more preferably 0.5 to 2% by weight, most preferably 0.75 to 1.25% by weight) of an emulsifier based on the weight of the aqueous heat protectant formulation. Most preferably, the aqueous heat protectant formulation prepared and used in the process of the present invention further comprises 0.01 to 80% by weight (preferably 0.1 to 5% by weight, even more preferably 0.5 to 2% by weight, most preferably 0.75 to 1.25% by weight) of an emulsifier of a compound based on the weight of the aqueous heat protectant formulation, the aqueous conditioner formulation is selected from the group consisting of leave-on hair conditioners and rinse-off hair conditioners, and the emulsifier comprises a mixture of PET-100 stearate and glyceryl stearate.

[0028] Preferably, the aqueous heat-protecting agent formulation prepared and used in the process of the present invention further comprises a thickener, optionally further comprising a thickener. More preferably, the aqueous heat-protecting agent formulation prepared and used in the process of the present invention further comprises a thickener, which is preferably selected to increase the viscosity of the aqueous conditioner formulation without substantially altering other properties of the personal care composition. Even more preferably, the aqueous heat-protecting agent formulation prepared and used in the process of the present invention further comprises a thickener, which is preferably selected to increase the viscosity of the personal care composition without substantially altering other properties of the personal care composition, and the thickener accounts for 0 to 5.0% by weight (preferably 0.1 to 5.0% by weight, more preferably 0.2 to 2.5% by weight, most preferably 0.5 to 2.0% by weight) based on the weight of the aqueous heat-protecting agent formulation. Preferred thickeners include polysaccharides and cellulosic polymers. Preferably, the thickener is a hydroxyethylcellulose polymer.

[0029] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention further comprises an optional chelating agent. More preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention further comprises 0.001 to 0.75% by weight (preferably 0.03 to 0.25% by weight) of a chelating agent based on the weight of the aqueous thermal protective agent formulation, the chelating agent being selected from the group consisting of ethylenediaminetetraacetic acid (EDTA) disodium, EDTA tetrasodium, citric acid, lactic acid, and mixtures thereof. Most preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention further comprises 0.001 to 0.75% by weight (preferably 0.03 to 0.25% by weight) of a chelating agent based on the weight of the aqueous thermal protective agent formulation, the chelating agent being EDTA tetrasodium.

[0030] Preferably, the aqueous heat-protective agent formulation prepared and used in the process of the present invention further optionally comprises an antimicrobial agent / preservative. More preferably, the aqueous heat-protective agent formulation prepared and used in the process of the present invention further comprises 0.05 to 1.25% by weight (preferably 0.1 to 1% by weight, more preferably 0.25 to 0.75% by weight) of an antimicrobial agent / preservative based on the weight of the aqueous heat-protective agent formulation, the antimicrobial agent / preservative being selected from the group consisting of phenoxyethanol, benzoic acid, benzyl alcohol, sodium benzoate, DMDM ​​hydantoin, 2-ethylhexylglyceryl ether, isothiazolinone (e.g., methylchloroisothiazolinone, methylisothiazolinone), and mixtures thereof. Most preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention further comprises 0.05 to 1.25% by weight (preferably 0.1 to 1% by weight, more preferably 0.25 to 0.75% by weight) of an antimicrobial agent / preservative, based on the weight of the aqueous thermal protective agent formulation, wherein the antimicrobial agent / preservative is a mixture of phenoxyethanol and isothiazolinone (more preferably, the antimicrobial / preservative is a mixture of phenoxyethanol and methylisothiazolinone).

[0031] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention contains a monosaccharide having an amine group with a detection limit.

[0032] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention is C 3~5 Contains monosaccharides within their detection limits.

[0033] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention contains a sugar with a detection limit.

[0034] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention contains a detection limit of soy protein.

[0035] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention contains hydrolyzed silk with a detection limit.

[0036] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention contains a sugar with a detection limit.

[0037] Preferably, the aqueous thermal protective agent formulation prepared and used in the process of the present invention contains <0.1% by weight (preferably <0.01% by weight, more preferably <0.001% by weight, most preferably < the detection limit) of hydrophobically modified poly(acrylamide-N-propyltrimethylammonium chloride).

[0038] Preferably, in the process for reducing hair (preferably mammalian hair, more preferably human hair) damage upon heat exposure of hair according to the present invention, the provided heat-protective agent formulation, a cosmetically acceptable aqueous carrier, and any additional components are combined using known processing techniques to provide an aqueous heat-protective agent formulation. More preferably, in the process for reducing hair (preferably mammalian hair, more preferably human hair) damage upon exposure of hair to heat according to the present invention, a heat-protective agent formulation provided, a cosmetically acceptable aqueous carrier, and any additional components are combined using known processing techniques to provide a water-based heat-protective agent formulation, the water-based heat-protective agent formulation comprising 25 to 99.95% by weight (preferably 50 to 99.9% by weight, more preferably 75 to 99.5% by weight, most preferably 80 to 99.3% by weight) of a cosmetically acceptable aqueous carrier and 0.1 to 5% by weight (preferably 0.15 to 2.5% by weight, more preferably 0.2 to 2% by weight, most preferably 0.25 to 1.5% by weight) of a heat-protective agent, based on the weight of the water-based heat-protective agent formulation.

[0039] Preferably, in the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage when hair is exposed to heat, the aqueous heat protectant formulation is applied to the hair using well-known techniques. More preferably, in the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage when hair is exposed to heat, the aqueous heat protectant formulation is applied to the hair, with 0.01 g to 5 g of the aqueous heat protectant formulation applied per gram of hair.

[0040] Preferably, the process of reducing hair (preferably mammalian hair, more preferably human hair) damage when hair is exposed to heat according to the present invention includes providing a heat-generating hair care device. The heat-generating hair care device typically falls into one of two main categories: (1) preferably a heat-generating hair care device used for wet hair (e.g., a hair dryer), and (2) preferably a heat-generating hair care device used for dry hair (e.g., a flat iron / curling iron, a hat roller).

[0041] Heat-generating devices designed for and typically used on wet hair are sometimes called hot air hair care devices. Examples of hot air hair care devices include hair dryers and hot air hair styling devices. A typical hair dryer is designed to direct hot air onto hair to accelerate drying. In these hair dryers, the air is directed through a suitable orifice and accelerated by a fan. The air expelled by such a hair dryer may be heated, for example, through the use of a resistance heater. Hair dryers may incorporate a hood, which covers the main portion of the hair. Hair dryers typically operate by delivering hot air temperatures of 50-100°C. Hot air stylers typically direct hot air through attachments designed to comb or otherwise manipulate hair. Hot air styling devices can deliver hot air temperatures up to 130°C.

[0042] Heat-generating devices designed and typically used for drying hair are sometimes called high-temperature surface hair care devices. Examples of high-temperature surface hair care devices may be designed for curling and / or straightening hair. High-temperature surface hair care devices typically rely on resistance heating, where heat is transferred to the hair through direct contact with the device, rather than using hot air. Heat transfer is typically achieved by bringing the hair into contact with the metal or ceramic surface of the high-temperature surface hair care device. High-temperature surface hair care devices are not typically used to dry hair. Rather, high-temperature surface hair care devices are typically implemented to change the style of hair, such as to create curls or straighten hair. The surface of a high-temperature surface hair care device, designed to transfer heat to and from the hair, typically achieves temperatures of 130–300°C.

[0043] Preferably, the process for reducing hair (preferably mammalian hair, more preferably human hair) damage during heat exposure of hair according to the present invention includes exposing hair to heat at a temperature of 50 to 300°C (preferably 80 to 280°C, more preferably 90 to 275°C, most preferably 100 to 250°C) using a heat-generating hair care device (the heat-generating hair care device is selected from the group consisting of at least one of hot air hair care devices (e.g., hair dryers, hot air hair styling devices) and high-temperature surface hair care devices (e.g., hot curlers, flat irons, and curling irons)) (for example, to dry or style the hair). More preferably, the process for reducing hair (preferably mammalian hair, more preferably human hair) damage during heat exposure of hair according to the present invention comprises exposing hair to heat at a temperature of 50 to 300°C (preferably 80 to 280°C, more preferably 90 to 275°C, most preferably 100 to 250°C) for 1 to 40 minutes using a heat-generating hair care device (the heat-generating hair care device is selected from the group consisting of at least one of hot air hair care devices (e.g., hair dryers, hot air hair styling devices) and high-temperature surface hair care devices (e.g., hot curlers, flat irons, and curling irons)) (for example, to dry or style the hair). Most preferably, the process for reducing hair (preferably mammalian hair, more preferably human hair) damage during heat exposure of hair according to the present invention comprises exposing hair to heat at a temperature of 50 to 300°C (preferably 80 to 280°C, more preferably 90 to 275°C, most preferably 100 to 250°C) for 2 to 40 minutes using a heat-generating hair care device (the heat-generating hair care device is selected from the group consisting of at least one of hot air hair care devices (e.g., hair dryers, hot air hair styling devices) and high-temperature surface hair care devices (e.g., hot curlers, flat irons, and curling irons)) (for example, to dry or style the hair), exposing the hair to heat for 1 to 20 minutes using a hot air hair care device to dry the hair, and then exposing the hair to heat for 1 to 20 minutes using a high-temperature surface hair care device to style the hair.

[0044] Preferably, the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage upon heat exposure of the hair optionally further comprises rinsing the hair with water. More preferably, the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage upon heat exposure of the hair optionally further comprises rinsing the hair with water before applying the aqueous heat protection agent formulation to the hair (preferably, the hair is rinsed with water for 30 seconds to 20 minutes (more preferably 30 seconds to 5 minutes)). Most preferably, the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage upon exposure to heat further optionally comprises rinsing the hair with water before applying the aqueous heat protectant formulation to the hair (preferably, the hair is rinsed with water for 30 seconds to 20 minutes (more preferably 30 seconds to 5 minutes)), and then drying the rinsed hair to remove excess water by at least one of towel-drying and pressing before applying the aqueous protectant formulation to the hair.

[0045] Preferably, the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage upon heat exposure of hair optionally further comprises at least one of combing and brushing the hair. More preferably, the process of the present invention for reducing hair (preferably mammalian hair, more preferably human hair) damage upon heat exposure of hair optionally further comprises at least one of combing and brushing the hair after application of the aqueous heat protection agent formulation (preferably combing and / or brushing the hair before, during, and / or after exposure of the hair to heat from a heat-generating hair care device).

[0046] Several embodiments of the present invention will be described in detail in the following examples.

[0047] Example S1: Heat-resistant agent A 2,000 mL three-necked round-bottom flask was filled with a mixture of hydrophobically modified hydroxyethylcellulose polymer (hmHEC) (90.20 g of EMBARK® rheology modifier 160, available from The Dow Chemical Company) and 2-propanol (673.92 g) and deionized water (120.52 g). The flask was equipped with a Claisen adapter featuring a stirring paddle and motor, a rubber ceramic cap, a nitrogen inlet, and a Friedrich condenser equipped with a subsurface thermocouple and mineral oil bubbler. The thermocouple was connected to a J-KEM controller and a heating mantle.

[0048] While stirring the contents of the flask, the flask was slowly purged with nitrogen for 1 hour to remove any entrained oxygen. A nitrogen flow rate of approximately 1 bubble per second was used. After nitrogen purging was complete, 9.60 g of a 25% sodium hydroxide aqueous solution was added to the contents of the flask under nitrogen while stirring using a plastic syringe through a ceramic cap. The contents of the flask were then stirred under nitrogen for 30 minutes.

[0049] Next, using a plastic syringe, 70% aqueous glycidyltrimethylammonium chloride (60.48 g, available from QUAB Chemicals under trade name QUAB® 151) was added dropwise to the contents of the flask over several minutes while stirring under nitrogen. After the addition was complete, the contents of the flask were stirred for 5 minutes, and then the contents of the flask were heated using a J-KEM controller. The temperature setpoint was 55°C, and the contents of the flask were heated at 55°C for 1.5 hours while stirring under nitrogen.

[0050] Next, the contents of the flask were cooled to room temperature while maintaining a positive nitrogen pressure inside the flask. Then, the contents of the flask were neutralized by adding glacial acetic acid (10.0 g) using a syringe. After stirring for 10 minutes, the thermal protectant of the product was recovered by vacuum filtration through a metal frit Buchner funnel. The thermal protectant was washed with a Buchner funnel using the following mixtures: 2-propanol (656 g) and deionized water (144 g), 2-propanol (720 g) and deionized water (80 g), and 2-propanol (800 g), 40% glyoxal (1.76 g), and glacial acetic acid (0.60 g). The thermal protectant was briefly air-dried and then dried overnight in vacuum at 50°C.

[0051] The thermal protectant was manually ground using a mortar and pestle, and sieved through a #30 US standard sieve to obtain 100.22 g of product. The thermal protectant had a volatile matter content of 4.41%, an ash content of 2.70% (as sodium chloride), and a Kjeldahl nitrogen content of 1.844%.

[0052] Comparative Examples C1-C4 and Example 1: Thermal Protection Heat damage procedure Hair bundles (2 g of slightly bleached Caucasian cuta asiatica, available from International Hair Importers) were moistened in 37°C distilled water for 30 seconds, then massaged with 1.5 g of 9 wt% sodium laureth sulfate (SLES) solution, rinsed with 0.4 L / min running water for 30 seconds, detangled with a brush, and then given a final rinse with 0.4 L / min running water for 10 seconds. The hair bundles were then treated (if present) by applying and allowing to act on 100 μL / g of a 1 wt% aqueous treatment solution of the active substance shown in Table 1. Before heat treatment of the hair bundles, a flat iron was preheated to 232°C. The bundles were then treated 10 times using the flat iron for 10 seconds each. After that, the bundles were washed with 9 wt% SLES solution, and this hair bundle heat treatment and washing process was repeated three times before the following DSC test was performed.

[0053] [Table 1]

[0054] DSC research Samples were prepared from hair bundles processed according to each of Comparative Examples C1-C4 and Example 1 by isolating at least two different locks of hair from each bundle and trimming them into small pieces (<2 mm in length) using clippers. The entire length of the selected hair locks was cut off and randomly distributed on weighing paper to average any differences in hair properties along the length of the bundle. Then, using tweezers, 10 mg of sample was taken from each pile of the small hair pieces. The samples were placed in separate 40 μL stainless steel pans (Perkin-Elmer part number 0319-2018) and distributed uniformly to the bottom of the pans. 30 μL of deionized water was added to each pan using a pipette to plasticize the cuticle and lower the hair denaturation temperature to below the decomposition temperature. The pans were then pressed and sealed with Viton O-rings and stainless steel lids, and the total starting mass was weighed. The sealed pans were left to stand at 25°C for 12 hours to equilibrate the hair samples at hydration levels. Next, the hair samples were analyzed using a differential scanning calorimeter (DSC) paired with a refrigerated cooling system (RCS90) unit. The hair samples were equilibrated at 40°C and then analyzed by heating the samples to 200°C at a temperature gradient rate of 10°C per minute. During the analysis, the bubble flow rate was 25 mL of nitrogen per minute. Both the denaturation temperature and denaturation enthalpy were determined using instrument software (TRIOS). The denaturation temperature was determined when the denaturation enthalpy was determined by integrating the endothermic transition peak temperature and the endothermic transition. The peak temperatures in terms of the DSC curve are reported in Table 2. The denaturation enthalpy for the hair samples is also reported in Table 2.

[0055] [Table 2]

Claims

1. A process for reducing damage to hair when hair is exposed to heat, To provide an aqueous carrier that is acceptable as a cosmetic, To select a heat protectant, where the heat protectant is selected based on its ability to provide heat protection to the hair from heat exposure, the heat protectant is selected to be a modified carbohydrate polymer, the modified carbohydrate polymer is (i) formula (I): 【Chemistry 1】 (In the formula, each R １ Independently, C １～７ The modified carbohydrate polymer comprises a trialkylammonium moiety selected from the group consisting of alkyl groups, wherein the modified carbohydrate polymer has a Kjeldahl nitrogen content (TKN) corrected for ash and volatile substances of 0.75 to 2.5% by weight, and (ii) a cellulose ether substrate functionalized with hydrophobic substituents, each having 16 carbon atoms, wherein the modified carbohydrate polymer contains 0.005 to 1.5% by weight of hydrophobic substituents based on the weight of the cellulose ether substrate, wherein the hydrophobic substituents are randomly distributed throughout the backbone of the cellulose ether substrate, and the cellulose ether substrate has a weight-average molecular weight M >1,000,000 Daltons Ｗ The modified carbohydrate polymer contains, based on the weight of the modified carbohydrate polymer, <0.001% by weight of crosslinking units. To provide the selected thermal protective agent, A combination of an aqueous carrier acceptable as a cosmetic and the thermal protective agent is formed to create an aqueous thermal protective agent formulation, wherein the aqueous thermal protective agent formulation contains 0.1 to 5% by weight of the thermal protective agent based on the weight of the aqueous thermal protective agent formulation. To provide hair, Apply the aqueous heat protective agent mixture to the hair. To provide a heat-generating hair care device, and A process comprising using the heat-generating hair care device to expose the hair to heat of 50 to 300°C for 1 to 30 minutes.

2. The process according to claim 1, wherein the hair to which the aqueous heat-protective agent formulation is applied exhibits a higher denaturation temperature than hair that is similarly exposed to heat but not to which the aqueous heat-protective agent formulation is applied.

3. The process according to claim 2, wherein the hair to which the aqueous heat-protective agent formulation is applied exhibits a higher denatured enthalpy than hair that is similarly exposed to heat but not to which the aqueous heat-protective agent formulation is applied.

4. The process according to claim 3, further comprising rinsing the hair with water before applying the aqueous heat-protective agent formulation to the hair.

5. The process according to claim 4, further comprising drying the rinsed hair to remove excess water by at least one of wiping and pressing the hair with a towel before applying the aqueous heat-protecting agent formulation to the hair.

6. The process according to claim 3, further comprising at least one of combing and brushing the hair after applying the aqueous heat-protective agent formulation.

7. The process according to claim 3, wherein the aqueous heat-protective agent compound applied to the hair further comprises a thickening agent.

8. The process according to claim 7, wherein the thickening agent is a polysaccharide.

9. The process according to claim 3, wherein the hydrophobic substituent of the selected thermal protectant is bonded to the cellulose ether substrate via an ether bond or via an ether bond and a 2-hydroxypropyl group.

10. The process according to claim 9, wherein the aqueous heat-protecting agent formulation further comprises an additive selected from the group consisting of chelating agents, preservatives, emollients, cosmetically acceptable cleansing surfactants, and mixtures thereof.

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