CN115427007A - Transparent shampoo bar and preparation method thereof - Google Patents

Abstract

The present invention relates to a method for producing a transparent shampoo block, comprising: i) Preparing a solution i) comprising at least one N-acyl amino acid and water, said solution i) having a temperature of from 70 ℃ to 100 ℃, preferably from 75 ℃ to 90 ℃, more preferably from 80 ℃ to 88 ℃; ii) preparing a solution ii) comprising at least one base and water, said solution ii) having a temperature of from 70 ℃ to 100 ℃, preferably from 75 ℃ to 90 ℃, more preferably from 80 ℃ to 88 ℃; iii) Adding the solution ii) to the solution i) while stirring at a temperature of 70 ℃ to 100 ℃, preferably 75 ℃ to 90 ℃, more preferably 80 ℃ to 88 ℃ to obtain a homogeneous transparent solution iii); and iv) cooling the solution iii) to room temperature, wherein: a) At least one alcohol is contained in said solution i) and/or said solution ii) and/or said solution iii); b) The water is included in a total amount of no more than 40 wt.%, preferably no more than 30 wt.%, based on the total weight of the transparent shampoo block; and c) optionally, a second surfactant and/or a hair conditioning compound is contained in said solution i) and/or said solution ii) and/or said solution iii). The invention also relates to a transparent shampoo block produced by the method of the invention.

Description

Transparent shampoo bar and preparation method thereof

technical field

The present invention relates to a transparent shampoo bar in solid form and a method for its preparation.

Background technique

Shampoo is a basic hair care product that accounts for the largest part of hair care cosmetics. The main function is to remove dirt, grime and sebum from the hair and scalp. Today, some shampoos have added benefits (eg, conditioning properties to the hair and mildness to the scalp) as consumer demand (beyond cleansing) has increased.

Regular shampoos are viscous liquids that are filled in bottles or sachets and can be applied directly to wet hair. However, shampoos in liquid form are more prone to leaking from their packaging, which can be very troublesome when they come into contact with clothing (eg, during movement). Furthermore, thickeners or gelling agents are more or less required in these products in order to produce viscous liquids, which can have the disadvantage of inhibiting foam formation. Furthermore, it has been noted that thicker compositions tend to require many rinses to remove residual product from the hair. Therefore, conventional shampoos in the form of viscous liquids require more water and are therefore not environmentally friendly either during production or during use.

As the concept of sustainability increases, people turn to more sustainable and greener products, such as products that contain less water, use less packaging and have a smaller social footprint.

Accordingly, it may be advantageous to provide the shampoo product in solid form, especially as a shampoo bar. The advantages of shampoo bars are less water, easy portability, no leaking issues, and less packaging material. Furthermore, from an aesthetic point of view, there is a need in the art for clear shampoo bars that are easy to produce, have good cleansing properties and optionally have good conditioning properties.

Contents of the invention

The present invention provides a method for producing a transparent hair shampoo bar, and the method is simple, easy to operate, low in cost and can provide a hair shampoo bar with excellent transparency.

One aspect of the present invention provides a method for producing a clear shampoo bar, the method comprising:

i) preparation of a solution i) comprising at least one N-acylamino acid and water, said solution i) having a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C,

ii) preparing a solution ii) comprising at least one base and water, said solution ii) having a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C,

iii) adding said solution ii) to said solution i) while stirring at a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, to obtain a homogeneous clear solution iii); and

iv) cooling said solution iii) to room temperature,

in

a) at least one alcohol is contained in said solution i) and/or said solution ii) and/or said solution iii),

b) said water is contained in a total amount of not more than 40% by weight, preferably not more than 30% by weight, based on the total weight of said transparent shampoo bar, and

c) Optionally, a second surfactant and/or a hair conditioning compound is included in said solution i) and/or said solution ii) and/or said solution iii).

Another aspect of the invention is a transparent shampoo bar obtainable by the method of the invention.

Yet another aspect of the present invention is a clear shampoo bar comprising:

- a salt formed in situ from at least one N-acylamino acid and at least one base,

-water,

- at least one alcohol,

- optionally present a second surfactant, and

- Optionally present a hair conditioning compound.

Yet another aspect of the present invention is a bi-layer shampoo and conditioning bar comprising a clear shampoo bar of the present invention on one side and a conditioning bar on the other side. bar).

The clear shampoo bar of the present invention has an excellent clear appearance, has good cleansing properties, and optionally has good conditioning properties.

Description of drawings

Fig. 1 is a photograph showing the transparency of a transparent shampoo bar of the present invention and a commercially available LUSH shampoo bar.

Figure 2 shows the results of a wet comb test using a clear shampoo bar from Example 1 of the present invention and different shampoos from the prior art.

Figure 3 shows the results of a dry comb test using a clear shampoo bar from Example 1 of the present invention and different shampoos from the prior art.

Detailed ways

It should be understood by those of ordinary skill in the art that the present discussion is a description of exemplary embodiments only, and is not intended to limit the broader aspects of the invention. Each aspect so described may be combined with one or more of any other aspect unless clearly stated to the contrary. In particular, any feature indicated as preferred or advantageous may be combined with any other feature or features indicated as preferred or advantageous.

Unless otherwise specified, the terms used in the context of the present invention are to be interpreted in accordance with the following definitions.

All wt.% or % by weight values quoted herein are percent by weight unless otherwise specified.

As used herein, the terms "a and an" and "the" include both singular and plural referents unless specified otherwise.

As used herein, the terms "comprising and comprises" are synonymous with "including and includes" or "containing and contains", are inclusive or open-ended, and do not exclude additional, non-exclusive Enumerated members, elements or method steps.

As used herein, the term "consisting essentially of" means that the listed components make up the bulk of the composition, for example, at least 70% by weight of the composition, at least 80% by weight of the composition, at least 85% by weight of the composition % by weight, or at least 90% by weight of the composition.

As used herein, the term "consisting of" is inclusive and excludes additional non-recited members, elements or method steps.

The term "at least one" or "one or more" used herein to define a component refers to the type of component, not the absolute number of molecules. For example, "one or more polyols" means one type of polyol or a mixture of different polyols.

The terms "about", "approximately" and the like used herein in relation to numerical values refer to the numerical value ± 10%, preferably ± 5%. All numerical values herein should be construed as modified by the term "about".

As used herein, the term "room temperature" refers to a temperature of about 20°C to about 25°C.

The term "transparent shampoo bar" as used herein can be interpreted as a shampoo bar with a thickness of about 2.5 cm having a light transmittance of greater than 70%, preferably greater than 80%, more preferably greater than 85%, still more preferably greater than 90%.

Unless otherwise specified, the recitation of numerical endpoints includes all numbers and fractions contained within the corresponding range, as well as the recited endpoints.

All references cited in this specification are hereby incorporated by reference in their entirety.

Unless otherwise defined, all terms (including technical terms and scientific terms) used in this invention have the meaning commonly understood by those of ordinary skill in the art to which this invention belongs.

The method of the present invention will be described in detail as follows.

In one aspect of the present invention there is provided a method for producing a clear shampoo bar, wherein said method comprises:

i) preparation of a solution i) comprising at least one N-acylamino acid and water, said solution i) having a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C,

ii) preparing a solution ii) comprising at least one base and water, said solution ii) having a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C,

iii) adding said solution ii) to said solution i) while stirring at a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, to obtain a homogeneous clear solution iii); and

iv) cooling said solution iii) to room temperature,

in

a) at least one alcohol is contained in said solution i) and/or said solution ii) and/or said solution iii),

b) said water is contained in a total amount of not more than 40% by weight, preferably not more than 30% by weight, based on the total weight of said transparent shampoo bar, and

c) Optionally, a second surfactant and/or a hair conditioning compound is included in said solution i) and/or said solution ii) and/or said solution iii).

In step i) of the present invention, solution i) is prepared by mixing its components and heating to a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C. Preferably, mixing and/or heating is performed while stirring.

The components of solution i) comprise at least one N-acylamino acid and water. Furthermore, solution i) may also comprise at least one alcohol and/or optionally one or more further ingredients which do not react with the at least one N-acylamino acid, such as secondary surfactants, conditioning compounds, preservatives, Flavors, antioxidants, and any combination thereof.

For the preparation of solution i), there is no particular restriction on the order of mixing the components of solution i), as long as a solution i is obtained at a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C ) is fine. Each component may be mixed with one or more other components and optionally preheated to a temperature within the temperature range specified above, and finally all the components, preheated or not, are placed in the above-mentioned mixed together at a temperature within the specified temperature range to obtain solution i). For example, at least one N-acyl amino acid and water may first be mixed and heated to a temperature falling within the temperature range specified above, and at least one alcohol (if present) may be mixed with or without preheating and/or said one or more other ingredients, if present, are added to the heated mixture of at least one N-acylamino acid and water, while maintaining the temperature within the specified range, to obtain solution i). Alternatively, all components (including at least one N-acylamino acid, water, at least one alcohol (if present) and/or the one or more other ingredients (if present)) can be mixed together and Heating to a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, to obtain solution i). Alternatively, at least one N-acyl amino acid may first be mixed with water and at least one alcohol (if present) and heated to a temperature falling within the temperature range specified above, and the preheated or non-preheated said one or more other ingredients, if present, are added to a heated mixture of at least one N-acylamino acid and water and at least one alcohol, if present, while maintaining the temperature within the specified range in order to obtain solution i). The order of mixing each component of solution i) is not limited to the above examples.

The at least one N-acyl amino acid useful in the present invention may be selected from N-acyl glutamic acid, N-acyl alanine, N-acyl glycine, N-acyl lysine, N-acyl proline and N-acyl Acyl sarcosine. The acyl group in the N-acyl amino acid may comprise an aliphatic acyl group having 6 to 22 carbon atoms. Specifically, at least one N-acyl amino acid useful in the present invention may be selected from cocoyl glutamic acid, lauroyl glutamic acid, stearoyl glutamic acid, myristoyl glutamic acid, palmitoyl glutamic acid , Oleoyl Glutamate, Cocoyl Alanine, Lauroyl Alanine, Stearoyl Alanine, Myristoyl Alanine, Palmitoyl Alanine, Oleoyl Alanine, Cocoyl Glycine , Lauroyl Glycine, Stearoyl Glycine, Myristoyl Glycine, Palmitoyl Glycine, Oleoyl Glycine, Cocoyl Lysine, Lauroyl Lysine, Stearoyl Lysine, Myristoyl Lysine, Palmitoyl Lysine, Oleoyl Lysine, Cocoyl Proline, Lauroyl Proline, Stearoyl Proline, Myristoyl Proline, Palmitoyl Proline, Oleoyl Proline , Cocoyl Sarcosine, Lauroyl Sarcosine, Stearoyl Sarcosine, Myristoyl Sarcosine, Palmitoyl Sarcosine, and Oleoyl Sarcosine.

In the solution i) of the present invention, there is no particular limitation on the water content, as long as at least one N-acyl amino acid can be dissolved in water at a temperature of 70°C to 100°C, and the following criteria can be met: based on transparent shampoo The total weight of the bar, the total water content in the transparent shampoo bar is not more than 40% by weight, preferably not more than 30% by weight. When the solution i) contains alcohol and/or said one or more other ingredients, the water content is sufficient to dissolve these ingredients and form a homogeneous solution i). For example, the water content in solution i) may not exceed 40% by weight, based on the total weight of solution i). The water content in solution i) can be adjusted, if desired, by evaporating excess water or adding water.

The at least one N-acylamino acid may be used in an amount of 10% to 50% by weight, preferably 15% to 40% by weight, based on the total weight of the transparent shampoo bar.

In one embodiment, solution i) comprises or consists of at least one N-acylamino acid and water.

In another embodiment, solution i) comprises or consists of at least one N-acylamino acid, water, at least one alcohol, a conditioning compound and a second surfactant.

In another embodiment, solution i) comprises or consists of at least one N-acylamino acid, water, at least one alcohol, a second surfactant, conditioning compounds, preservatives and antioxidants.

In step ii) of the present invention, solution ii) is prepared by mixing its components and heating to a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C. Preferably, mixing and/or heating is performed while stirring.

The components of solution ii) comprise at least one base and water. Furthermore, solution ii) may also comprise at least one alcohol and/or optionally one or more further ingredients which do not react with at least one base, such as secondary surfactants, conditioning compounds, preservatives, fragrances, anti Oxidizing agents and any combination thereof.

For the preparation of solution ii), there is no particular restriction on the mixing order of the components of solution ii), as long as a solution ii is obtained at a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C ) is fine. Each component may be mixed with one or more other components and optionally preheated to a temperature within the temperature range specified above, and finally all the components, preheated or not, are placed in the above-mentioned mixed together at a temperature within the specified temperature range to obtain solution ii). For example, at least one base and water may first be mixed and heated to a temperature falling within the temperature range specified above, and the preheated or non-preheated at least one alcohol (if present) and/or The one or more other ingredients, if present, are added to the above heated mixture while maintaining the temperature within the specified range to obtain solution ii). Alternatively, all components (including at least one base, water, at least one alcohol (if present) and/or the one or more other ingredients (if present)) can be mixed together and heated to 70 °C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, to obtain solution ii). Alternatively, at least one base may first be mixed with water and at least one alcohol (if present) and heated to a temperature falling within the temperature range specified above, and the preheated or non-preheated One or more other ingredients, if present, are added to the above heated mixture while maintaining the temperature within the specified range to obtain solution ii). The order of mixing each component of solution ii) is not limited to the above examples.

In the solution ii) of the present invention, there is no particular limitation on the water content, as long as at least one alkali can be dissolved in water at a temperature of 70°C to 100°C, and the following standard can be satisfied: By weight, the total content of water in the transparent shampoo bar is not more than 40% by weight, preferably not more than 30% by weight. When the solution ii) contains alcohol and/or said one or more other ingredients, the water content is sufficient to dissolve these ingredients and form a homogeneous solution ii). For example, the water content in solution ii) may not exceed 40% by weight, based on the total weight of solution ii). The water content in solution ii) can be adjusted, if desired, by evaporating excess water or adding water.

The base that can be used in the present invention can be selected from aminomethylpropanol, aminoethylpropanol, triethanolamine, ethanolamine, diethanolamine, tetrahydroxypropylethylenediamine, potassium hydroxide, sodium hydroxide and sodium bicarbonate.

Preferably, at least one base used in the present invention comprises triethanolamine. For example, the at least one base may be triethanolamine or a combination of triethanolamine and a base other than triethanolamine, such as a combination of triethanolamine and aminomethylpropanol, a combination of triethanolamine and aminoethylpropanol, a combination of triethanolamine and Combinations of ethanolamine and/or diethanolamine and/or tetrahydroxypropylethylenediamine.

At least one base may be used in an amount of 5% to 30% by weight, preferably 10% to 25% by weight, based on the total weight of the transparent shampoo bar.

In one embodiment, solution ii) comprises or consists of at least one base and water.

In another embodiment, the solution ii) comprises or consists of at least one base, water and at least one alcohol.

In another embodiment, the solution ii) comprises or consists of at least one base, water, at least one alcohol, a conditioning compound and a second surfactant.

In another embodiment, the solution ii) comprises or consists of at least one base, water, at least one alcohol, a second surfactant, a conditioning compound, a preservative and an antioxidant.

The at least one alcohol, conditioning compound, preservative or antioxidant used in solution ii) may be the same as the at least one alcohol, conditioning compound, preservative or antioxidant used in solution i), respectively, and/or may be different from At least one alcohol, conditioning compound, preservative or antioxidant used in solution i).

For preparing solution i) and solution ii) at a temperature of 70°C to 100°C, any conventional heating means/methods can be used herein without any particular limitation. Preferably, the heating is performed while stirring in order to obtain a homogeneous solution i) and solution ii).

In step iii) of the present invention, it is necessary to add solution ii) to solution i) while stirring (preferably, slowly) to ensure a homogeneous and transparent solution iii). During this step a reaction takes place. Without being bound by theory, it is believed that one or more salts may be formed from the reaction between at least one N-acylamino acid and at least one base, and with one or more salts added directly to solution iii) In contrast, the salt or salts formed in situ here act differently in solution iii). In fact, if the order of addition is reversed (ie solution i) is added to solution ii)), the process for producing shampoo bars with high transparency cannot be established (see comparative example 3). Meanwhile, if one or more salts of at least one N-acyl amino acid and at least one base are directly added to the system without reaction, a shampoo bar with high transparency cannot be obtained (see Comparative Example 1 and Comparative Example 1 and Scale 2).

In step iii) of the present invention, in addition to the operation of adding solution ii) to solution i), at least one preheated or non-preheated alcohol and/or the one or more other ingredients to obtain a homogeneous and transparent solution iii).

As used herein, the term "preheating" means preheating the referred substance to a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, or preheat to a temperature below the range specified above.

In order to obtain a transparent shampoo bar, the gist of the invention is to add the solution ii) comprising at least one base to the solution i) comprising at least one N-acyl amino acid, and the order of addition cannot be reversed. As for the other components in the transparent shampoo bar, their addition order or addition time are not particularly limited.

There are commercially available clear liquid shampoos. However, the formation of clear shampoo bars is very different from that of clear liquid shampoos. In clear liquid shampoos, when all components are in a dissolved state, the appearance is clear. When most of the solvent is removed, some components will precipitate and an opaque solid phase will form. During the formation of the clear shampoo bar, much less water (or solvent) is used during manufacture. At such low solvent levels, simply mixing all the ingredients together (even at elevated temperatures) will not result in a clear bar, as some of the ingredients will precipitate once the temperature returns to room temperature and thus form a bar with an opaque appearance. solid.

After step iii), the transparent solution iii) may optionally be left to stand without stirring at a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C for about 5 min to about 1 h (eg, about 15 min to 40 min). Solution iii) can then be poured into molds and cooled to room temperature, and a transparent shampoo bar is obtained in solid form. If desired, the water content in solution iii) can be adjusted by evaporating excess water or adding to water, as long as the water content in solution iii) does not exceed 40% by weight, preferably not more than 30% by weight.

As used herein, the term "solid form" refers to the state in which a block does not flow under its own weight and does not change its shape under the force by which it is picked up.

The at least one alcohol that can be used in the present invention may be those alcohols having not more than 10 carbon atoms, preferably those aliphatic alcohols, preferably those aliphatic alcohols having 2 or 3 OH groups. Examples of alcohols include ethanol (denatured or undenatured), ethylene glycol, propylene glycol (such as 1,3-propanediol), butanediol (such as 1,2-butanediol, 2,3-butanediol, 1,4 -butanediol), pentanediol (such as 1,2-pentanediol, isopentyl glycol, 1,5-pentanediol), hexanediol (such as 1,2-hexanediol, 1,6- hexanediol), octanediol, nonanediol (such as 1,9-nonanediol), decanediol (such as 1,10-decanediol), glycerin, sorbitol, diethylene glycol, dipropylene glycol, etc. .

At least one alcohol is an essential component of the present invention. Alcohol may be contained in solution i) and/or solution ii) and/or solution iii). In other words, there is no particular limitation as to in which step at least one alcohol is added to the system, as long as the alcohol exists in the system. In addition, it is feasible that alcohol exists in each solution of the system or that alcohol is added to the system in each step. Furthermore, alcohols in each solution or added in each step may be the same or different from each other.

The expression "at least one alcohol is contained in solution i) and/or solution ii) and/or solution iii)" can be interpreted as:

- at least one alcohol is contained only in solution iii),

- at least one alcohol is contained in solution i) and solution iii),

- at least one alcohol is contained in solution ii) and solution iii), and

- at least one alcohol is contained in solution i), solution ii) and solution iii).

In one embodiment of the invention, at least one alcohol may be present together with the N-acyl amino acid and water, and they may be heated together to fall between 70°C and 100°C, preferably between 75°C and 90°C, more preferably Temperatures in the range of 80°C to 88°C.

In one embodiment of the invention, solution i) may contain propylene glycol and glycerol and ethanol, solution ii) does not contain alcohol and no alcohol is incorporated during step iii).

In another embodiment of the present invention, solution i) may contain propylene glycol and glycerol, solution ii) may contain ethanol, and butanediol is incorporated during step iii).

In yet another embodiment of the present invention, solution i) may comprise propylene glycol and glycerol and ethanol, solution ii) may comprise propylene glycol and glycerol and ethanol, and no alcohol is incorporated during step iii).

Irrespective of the solution in which the at least one alcohol is present, the at least one alcohol is contained in total in an amount of 5% to 30% by weight, preferably 10% to 20% by weight, based on the total weight of the transparent shampoo bar.

Optionally, a second surfactant may be included in solution i) and/or solution ii) and/or solution iii). In other words, there is no particular limitation as to in which step the second surfactant is added to the system, as long as the second surfactant exists in the system. In addition, it is feasible that the second surfactant exists in each solution of the system or that the second surfactant is added to the system in each step. Furthermore, the second surfactants in each solution or added in each step may be the same or different from each other. From the viewpoint of better cleaning effect, it is preferable to include a second surfactant in the system in addition to the N-acyl amino acid or its in situ formed salt.

As used herein, the term "secondary surfactant" refers to those surfactants that are not N-acylamino acids as defined herein and salts formed in situ of N-acylamino acids with bases as defined herein. For example, if sodium lauryl sarcosinate is added directly to solution i), sodium lauryl sarcosinate acts as a second surfactant, but if lauryl sarcosine is added into solution i) and then reacted with the base in solution ii), lauroyl sarcosine does not act as a second surfactant. In short, if the surfactant added to the system does not participate in the reaction to form a salt, the added surfactant acts as a second surfactant.

The second surfactant usable in the present invention may be selected from anionic surfactants, amphoteric surfactants, glucoside derivatives and the like.

Examples of anionic surfactants include sodium laureth-11 carboxylate, ammonium laureth-12 sulfate, sodium laureth-12 sulfate, sodium laureth-13 carboxylate, Sodium Laureth-2 Sulfosuccinate/MEA, Sodium Laureth-4 Phosphate, Sodium Laureth-4 Carboxylate, Sodium Laureth-40 Sulfate, Sodium Laureth-5 Carboxylate Sodium, Disodium Laureth-6 Sulfosuccinate, Laureth-6 Carboxylic Acid, Sodium Laureth-6 Carboxylate, Magnesium Laureth-8 Sulfate, Laureth-6 Carboxylate Sodium Laureth Sulfate, Sodium Laureth-8 Carboxylate, Potassium Laureth Phosphate, Ammonium Laureth Sulfate, Magnesium Laureth Sulfate, Sodium Laureth Sulfate, Laureth Sulfate Sulfate MEA Salt, Laureth Sulfate MIPA Salt, Laureth Sulfate TEA Salt, Laureth Sulfate TIPA Salt, Disodium Laureth Sulfosuccinate, Disodium Lauryl Phosphate , Potassium Lauryl Phosphate, Sodium Lauryl Phosphate, Ammonium Lauryl Sulfate, Potassium Lauryl Sulfate, Magnesium Lauryl Sulfate, Sodium Lauryl Sulfate, MEA Lauryl Sulfate, TEA Lauryl Sulfate , Sodium Lauryl Sulfoacetate, Disodium Lauryl Sulfosuccinate, Sodium Lauryl Glycol Carboxylate, Sodium Lauryl Glucose Carboxylate, Magnesium Oleth Sulfate, Sodium Oleth Sulfate , Oleyl Sulfate TEA Salt, Sodium Oleyl Sulfate, Sodium Cocoeth-30 Sulfate, Sodium Cocoeth Sulfate, Sodium Cocoyl Sulfate, Sodium Cocoyl Isethionate , Sodium Cocoyl Isethionate, Sodium Cocoyl Isethionate, Sodium Cocoyl Isethionate, Sodium Cocoyl Isethionate, Oleamide MIPA Sulfosuccinate II Sodium, Disodium Oleamide MIPA Sulfosuccinate, Sodium Stearyl Sulfate, Sodium Steareth-4 Phosphate, Sodium PEG-7 Olive Oil Carboxylate, Sodium Trideceth-3 Carboxylate , Sodium Trideceth-4 Carboxylate, Sodium Trideceth-7 Carboxylate, Sodium Trideceth Sulfate, C10-15 Sodium Trideceth Sulfate, C10-16 Polyethers Ether-2 Sodium Sulfate, C12-13 Alcohol Phosphate Potassium, C12-13 Alcohol Sulfate TEA Salt, C12-13 Sodium Alketh Sulfate, C12-13 Sodium Alkyl Sulfate, C12-14 Alketh- Disodium 2 Sulfosuccinate, Sodium C12-14 Pareth-3 Sulfate, Sodium C12-14 Olefin Sulfonate, Ammonium C12-15 Pareth Sulfate, C12-15 Pareth-3 Sodium sulfate, C12-15 alkanol-7 sodium carboxylate, C12-15 alkanol sodium sulfate, C12-15 alkyl ammonium sulfate, C12-15 alkyl sodium sulfate, C12-18 alkyl sodium sulfate, Sodium C14-16 Olefin Sulfonate, Sodium C14-17 Secondary Alkyl Sulfonate, Sodium C14-18 Olefin Sulfonate, Sodium C16-18 Olefin Sulfonate, Sodium Methyl Cocoyl Taurate, Methyl Cocoyl Taurate Sodium Sulfonate, Sodium Methyl Cocoyl Taurate, Sodium Methyl Oleoyl Taurate, Sodium Methyl Oleoyl Taurate, Sodium Methyl Oleoyl Taurate, Ricinoleic Acid Disodium Amide MEA Sulfosuccinate, Disodium PEG-12 Dimethicone Sulfosuccinate, Trideceth-7 Carboxylic Acid, Coco-Glucoside Sulfosuccinate Disodium, Sodium Coco-Glucoside Tartrate, Disodium Coco-Glucoside Citrate, Sodium Hydroxypropyl Sulfonate Lauryl Glucoside Crosspolymer, Sodium Lauryl Sarcosinate ), ammonium lauroyl sarcosinate, potassium lauroyl sarcosinate, sodium palmitoyl sarcosinate, ammonium cocoyl sarcosinate, sodium cocoyl sarcosinate, TEA salt of cocoyl sarcosinate, lauroyl TEA Glutamate, Disodium Lauroyl Glutamate, Potassium Lauroyl Glutamate, Sodium Lauroyl Glutamate, Sodium Palmitoleic Glutamate, Potassium Myristoyl Glutamate, Myristoyl Glutamate Sodium, Disodium Cocoyl Glutamate, Potassium Cocoyl Glutamate, Sodium Cocoyl Glutamate, TEA Salt of Cocoyl Glutamate, Disodium Stearoyl Glutamate, Stearoyl Glutamine Sodium Cocoyl Glycinate, Sodium Cocoyl Glycinate, and Potassium Cocoyl Glycinate.

Examples of amphoteric surfactants include cocamidopropyl betaine, lauryl amidopropyl betaine, palm kernel oleamide propyl betaine, palmitamidopropyl betaine, babassu oleamide propyl betaine, soybean oleamide Propyl Betaine, Methoxycinnamidopropyl Hydroxysultaine, Erucamidopropyl Hydroxysultaine, Cetyl Betaine, Myristyl Betaine, Behenyl Betaine, Shea Butter Amidopropyl Betaine, Myristoamidopropyl Betaine, Undecylenamidopropyl Betaine, Wheat Germ Oleamidopropyl Betaine, Caprylyl/Caprylamidopropyl Betaine, Cocoyl Hydroxysulfo Betaine, Coco Betaine, Cocoyl/Oleamidopropyl Betaine, Cocamidopropyl Hydroxysultaine, Cocamidopropyl Betaine Amide MEA Chloride, Cocamidoethyl Betaine , Isostearamidopropyl Betaine, Stearyl Betaine, Stearamidopropyl Betaine, Oleyl Betaine, Oleamidopropyl Betaine, Lauryl Hydroxysultaine, Lauryl Betaine, Lauryl Betaine Amidopropyl Hydroxysultaine, Sodium Cocoamphopropionate, Disodium Cocoamphodipropionate, Disodium Cocoamphodiacetate, Sodium Cocoamphohydroxypropyl Sulfonate and sodium oleamphoacetate.

Examples of glucoside derivatives include C12-16 alkyl glucoside, C12-18 alkyl glucoside, C12-20 alkyl glucoside, C8-14 alkyl glucoside, decyl glucoside, arachidyl glucoside, cetyl Wax Stearyl Glucoside, Myristyl Glucoside, Capryl/Decyl Glucoside, Capryl Dimethicone Ethoxyglucoside, Capryl Glucoside, Coco Glucoside, Ethyl Glucoside Glycosides, Isostearyl Glucoside and Lauryl Glucoside.

In one embodiment of the invention, the second surfactant may be present together with the N-acyl amino acid and water, and they may be heated together to fall in the range of 70°C to 100°C, preferably 75°C to 90°C, more preferably to a temperature in the range of 80°C to 88°C.

The expression "the second surfactant and/or the hair conditioning compound is comprised in solution i) and/or solution ii) and/or solution iii)" can be interpreted as:

- the second surfactant or hair conditioning compound is contained only in solution iii),

- a second surfactant or hair conditioning compound is contained in solution i) and solution iii),

- a second surfactant or hair conditioning compound is contained in solution ii) and solution iii),

- a second surfactant or hair conditioning compound is contained in solution i), solution ii) and solution iii),

- the second surfactant and the hair conditioning compound are contained in solution iii) only,

- a second surfactant and a hair conditioning compound are contained in solution i) and solution iii),

- a second surfactant and a hair conditioning compound are contained in solution ii) and solution iii),

- The second surfactant and the hair conditioning compound are contained in solution i), solution ii) and solution iii).

The second surfactant may be contained in the clear shampoo bar in an amount of 0% to 25% by weight, preferably 5% to 20% by weight, based on the total weight of the clear shampoo bar.

Optionally, hair conditioning compounds may be included in solution i) and/or solution ii) and/or later incorporated into solution iii). In other words, there is no particular limitation as to at which step the conditioning compound is added to the system, as long as the conditioning compound is present in the system. In addition, it is feasible that the conditioning compound is present in each solution of the system or that the conditioning compound is added to the system at each step. Furthermore, the conditioning compounds in each solution or added at each step may be the same or different from each other. From the standpoint of better conditioning benefits, it is preferred to include hair conditioning compounds.

As used herein, the term "conditioning compound" refers to those compounds that impart additional properties to the hair (eg, smoothness, combability, elasticity, shine, softness, hair damage repair, etc.) other than cleansing.

Conditioning compounds useful herein may be selected from cationic polymers, fatty acid esters with hydrophilic groups, oils, plant extracts, and the like.

Examples of cationic polymers include starch hydroxypropyltrimonium chloride, guar gum hydroxypropyltrimonium chloride, locust carob gum hydroxypropyltrimonium chloride, tara hydroxypropyltrimonium chloride Trimethylammonium Chloride, Cassia Gum Hydroxypropyltrimonium Chloride, Dextran Hydroxypropyltrimonium Chloride, Hydroxypropyl Guar Gum Hydroxypropyltrimonium Chloride, Hydroxypropyltrimonium Chloride Oxidized Starch PG-Trimethylammonium Chloride, Hydrogenated Starch Hydrolyzate Hydroxypropyltrimethylammonium Chloride, Ginseng Hydroxypropyltrimethylammonium Chloride, Lauryl Methyl Gluceth-10 Hydroxypropyl Ammonium Chloride dimethyl ammonium chloride, acrylamidopropyltrimethylammonium chloride/acrylamide copolymer, propyltrimethylammonium chloride acrylamide/dimethylacrylamide copolymer, dimethylacrylamide/ethyl Trimethylammonium chloride methacrylate copolymer, polymethacrylamidopropyltrimethylammonium chloride, acrylamidopropyltrimethylammonium chloride/acrylic acid (ester) copolymer, acrylamidopropyl trimethylammonium chloride Trimethylammonium Chloride/Acrylamide Copolymer, PG-Hydroxyethylcellulose Cocoyldimethylammonium Chloride, PG-Hydroxyethylcellulose Stearyldimethylammonium Chloride, Soybean Oleamide Propylbenzyldimethylammonium chloride, distearoyloxyethyldimethylammonium chloride, dipalmitoyloxyethyldimethylammonium chloride, polyquaternium-1, polyquaternium- 10. Polyquaternium-104, Polyquaternium-11, Polyquaternium-15, Polyquaternium-16, Polyquaternium-18, Polyquaternium-19, Polyquaternium-2 , Polyquaternium-22, Polyquaternium-24, Polyquaternium-28, Polyquaternium-30, Polyquaternium-32, Polyquaternium-33, Polyquaternium-35, Polyquaternium-37, Polyquaternium-39, Polyquaternium-4, Polyquaternium-43, Polyquaternium-44, Polyquaternium-46, Polyquaternium-47, Polyquaternium Quaternium-49, Polyquaternium-50, Polyquaternium-51, Polyquaternium-52, Polyquaternium-53, Polyquaternium-55, Polyquaternium-56, Polyquaternium Ammonium-57, Polyquaternium-6, Polyquaternium-61, Polyquaternium-62, Polyquaternium-63, Polyquaternium-64, Polyquaternium-65, Polyquaternium Salt-67, Polyquaternium-68, Polyquaternium-69, Polyquaternium-7, Polyquaternium-73, Polyquaternium-74, Polyquaternium-75, Polyquaternium -76, polyquaternium-78 and polyquaternium-80.

Examples of fatty acid esters with hydrophilic groups include PEG-7 glyceryl cocoate, PEG-7 caprylic/capric glycerides, PEG-70 mango seed oil glycerides, and PPG-3 capryl ether.

Examples of oils include vegetable oils, essential oils such as peppermint oil, silicone oils such as dimethicone, and diamino PEG/PPG-41/3 aminoethyl PG-propyl dimethicone .

The hair conditioning compound may be included in an amount of 0% to 30% by weight, preferably 0.1% to 20% by weight, more preferably 0.2% to 10% by weight, based on the total weight of the clear shampoo bar.

Furthermore, additives (eg preservatives, antioxidants, fragrances) may optionally be added at any step of the method of the invention.

In another aspect of the invention there is provided a transparent shampoo bar produced by the method according to the invention.

In yet another aspect of the present invention there is provided a clear shampoo bar wherein said bar comprises:

- a salt formed in situ from at least one N-acylamino acid and at least one base,

-water,

- at least one alcohol,

- optionally present a second surfactant, and

- Optionally present a hair conditioning compound.

In the clear shampoo bar of the present invention, the expression "salt formed in situ from at least one N-acylamino acid and at least one base" is to be understood as the salt present in place in the clear shampoo bar. formed, not added from the outside. As shown in the examples, only adding the salt of N-acyl amino acid directly to the system cannot form a transparent shampoo bar, and according to the examples, the salt of N-acyl amino acid can be added as a second surfactant, but in order to form a transparent Block, at least a portion of the salt of the N-acylamino acid should be formed in situ. Therefore, if a salt of an N-acyl amino acid is detected in a commercially available clear shampoo bar (which also contains other components of the present invention), it can be determined that the salt of the N-acyl amino acid is in situ formed, or at least a portion of the salt of the N-acyl amino acid is formed in situ, and thus commercially available clear shampoo bars should be considered within the scope of the present invention.

The salt formed in situ from at least one N-acylamino acid and at least one base is comprised in an amount of 15% to 80% by weight, preferably 20% to 55% by weight, based on the total weight of the transparent shampoo bar.

The definition and selection of at least one N-acylamino acid and at least one base that can be used in the transparent shampoo bar of the present invention are the same as those described above for at least one N-acylamino acid and at least one base in the method according to the present invention. Definition and selection are the same.

Water is contained in a total amount of not more than 40% by weight, preferably not more than 30% by weight, based on the total weight of the transparent shampoo bar.

At least one alcohol is an essential component of the clear shampoo bars according to the invention. The definition and selection of the at least one alcohol which can be used in the transparent shampoo bar according to the invention is the same as the definition and selection of the at least one alcohol mentioned above in the method according to the invention. At least one alcohol is contained in an amount of 5% to 30% by weight, preferably 10% to 20% by weight, based on the total weight of the transparent shampoo bar.

Optionally, a second surfactant may be included in the clear shampoo bar. From the viewpoint of better cleaning effect, it is preferable to include a second surfactant in the system in addition to the N-acyl amino acid or its in situ formed salt. The definition and selection of the second surfactant that can be used in the clear shampoo bar of the present invention is the same as the definition and selection of the second surfactant described above in the method according to the invention. The second surfactant may be contained in the clear shampoo bar in an amount of 0% to 25% by weight, preferably 5% to 20% by weight, based on the total weight of the clear shampoo bar.

Optionally, hair conditioning compounds may be included in clear shampoo bars. From the standpoint of better conditioning benefits, it is preferred to include hair conditioning compounds. The definition and selection of hair conditioning compounds useful in the clear shampoo bars of the present invention are the same as defined and selected above for hair conditioning compounds in the method according to the present invention. The hair conditioning compound may be contained in the clear shampoo bar in an amount of 0% to 30% by weight, preferably 0.1% to 20% by weight, more preferably 0.2% to 10% by weight, based on the total weight of the bar middle.

In addition, additives (such as preservatives, antioxidants, fragrances) may optionally be included in the clear shampoo bar of the present invention.

The transparent shampoo bar of the present invention can be in any shape (such as any common shape of soap), and can be in any size (such as any common size of soap), for example, for use in several (such as only one to five) shampoos size, or for use in relatively long washes).

In addition, the present invention provides a double layer shampoo and conditioning bar comprising a clear shampoo bar of the invention on one side and a conditioning bar on the other side. Conditioning bars useful in the present invention can be in any color as desired, such as white conditioning bars.

For the conditioning block that can be used in the present invention, the entire content of the patent application with application number PCT/CN2018/124871 is incorporated herein by reference.

Example

The invention will now be described by the following examples. The following examples are intended to help those skilled in the art better understand and implement the present invention. The scope of the present invention is not limited to the embodiments, but is defined in the appended claims. All parts and percentages are by weight unless otherwise indicated.

raw material

Example 1:

Table 1: Components used to prepare clear shampoo bars

method:

1. Mix components Nos. 1 to 6 together and heat them to a temperature of about 85°C;

2. Add component No. 7 to the heated components No. 1 to 6 while stirring, while maintaining a temperature of about 85°C;

3. Mix components Nos. 8 to 11 together and add them to the heated components Nos. 1 to 7 while stirring to obtain a solution i) at a temperature of about 85° C.;

4. Mix components no. 12 to 13 and heat them to a temperature of about 85° C. to obtain solution ii);

5. Slowly add solution ii) to solution i) over about 2 min to 5 min while stirring while maintaining a temperature of about 85°C;

6. Then add components no. 14 to 16 while stirring to obtain solution iii);

7. Stop stirring and maintain the temperature at about 85 °C for about 20 min;

8. Pour the solution iii) into the mold, and let it cool down to room temperature naturally to obtain a uniform transparent shampoo block.

The shampoo bar obtained has excellent transparency, see Figure 1, which shows a shampoo bar according to Example 1 with a thickness of 2.5 cm, and the letters below the bar can be clearly seen with the naked eye through the bar. In contrast, commercially available LUSH shampoo bars are completely opaque.

Example 2: Double Layer Shampoo Conditioning Bar

Table 2: Components Used to Prepare Dual Layer Shampoo Conditioning Bars

Components Nos. 1 to 11 were used to prepare the conditioning layer; and Components Nos. 12 to 22 were used to prepare the clear shampoo layer.

White conditioning layer preparation:

1. Mix components no. 5 to 11 and heat them to a temperature of about 85°C;

2. Add components Nos. 1 to 4 to the heated components Nos. 5 to 11 while stirring at a temperature of about 85°C;

3. cooling to a temperature of 60-65°C; and

4. Pour the mixture into the mold and fully cure the mixture.

Clear Shampoo Layer Preparation:

1. Mix components no. 12 to 17 together and heat them to a temperature of about 85° C. to obtain solution i);

2. Mix components no. 18 to 19 and heat them to a temperature of about 85° C. to obtain solution ii);

3. Slowly add solution ii) to solution i) over about 2 min to 5 min while stirring while maintaining a temperature of about 85°C;

4. Add components no. 20 to 22 while stirring to obtain solution iii);

5. Stop stirring and maintain the temperature at about 85°C for about 20 min.

Double layer preparation:

The solution iii) obtained above was poured into the same mold of the conditioning layer, and cooled naturally to room temperature to form a double-layer shampoo conditioning block with a transparent shampoo block on one side and a white conditioning block on the other side.

Example 3:

Table 3: Components used to prepare clear shampoo bars

method:

1. Mix components no. 1 to 6 together and heat them to a temperature of about 85° C. to obtain solution i);

2. Mix components no. 7 to 9 together and heat them to a temperature of about 85° C. to obtain solution ii);

3. Slowly add solution ii) to solution i) for about 2 min to 5 min while stirring while maintaining a temperature of about 85° C. to obtain solution iii);

4. Stop stirring and maintain the temperature at about 85 °C for about 20 min;

5. Pour the solution iii) into a mold, and let it cool down to room temperature naturally to obtain a uniform transparent shampoo block.

The obtained shampoo bar has excellent transparency, see Figure 1, which shows the shampoo bar of Example 3 with a thickness of 2.5 cm, and the letters below the bar can be clearly seen with the naked eye through the bar.

Example 4:

Table 4: Components used to prepare clear shampoo bars

method:

1. Mix components Nos. 1 to 6 together and heat them to a temperature of about 85°C;

2. Mix components Nos. 7 to 11 together and add them to the heated components Nos. 1 to 6 while stirring to obtain a solution i) at a temperature of about 85° C.;

3. Mix components no. 12 to 13 and heat them to a temperature of about 85° C. to obtain solution ii);

4. Slowly add solution ii) to solution i) over about 2 min to 5 min while stirring while maintaining a temperature of about 85°C;

5. Then add components no. 14 to 16 while stirring to obtain solution iii);

6. Stop stirring and maintain the temperature at about 85 °C for about 20 min;

7. Pour the solution iii) into a mold and let it cool down to room temperature naturally to obtain a uniform transparent shampoo block.

The obtained shampoo bar has excellent transparency, see Figure 1, which shows the shampoo bar of Example 4 with a thickness of 2.5 cm, and the letters below the bar can be clearly seen with the naked eye through the bar.

Example 5:

Table 5: Components used to prepare clear shampoo bars

method:

1. Mix components Nos. 1 to 5 together and heat them to a temperature of about 85°C;

2. Mix components Nos. 6 to 10 and 13 to 15 together and add them to the heated components Nos. 1 to 5 while stirring to obtain a solution i) at a temperature of about 85°C;

3. Mix components no. 11 to 12 and heat them to a temperature of about 85° C. to obtain solution ii);

4. Slowly add solution ii) to solution i) over about 20 min while stirring while maintaining a temperature of about 85° C. to obtain solution iii);

5. Stop stirring and maintain the temperature at about 85 °C for about 20 min;

6. Pour the solution iii) into the mold and let it cool down to room temperature naturally to obtain a uniform transparent shampoo block.

The obtained shampoo bar has excellent transparency, see Figure 1, which shows the shampoo bar of Example 5 with a thickness of 2.5 cm, and the letters below the bar can be clearly seen with the naked eye through the bar.

Comparative example 1:

Table 6: Components used to prepare shampoo

method:

1. Mix components Nos. 1 to 6 together and heat them to a temperature of about 85°C;

2. Add component No. 7 to the heated components No. 1 to 6 while stirring, while maintaining a temperature of about 85°C;

3. Mix components Nos. 8 to 11 together and add them to the heated components Nos. 1 to 7 while stirring to obtain a first solution at a temperature of about 85°C; the first solution is opaque solution, because the components cannot be completely dissolved;

4. Heating component No. 12 to a temperature of about 85° C. to obtain a second solution;

5. Slowly add the second solution to the first solution for about 20 minutes while stirring, while maintaining a temperature of about 85° C. to obtain a third solution; the third solution is an opaque solution;

6. Stop stirring and maintain the temperature at about 85 °C for about 20 min;

7. Pour the third solution into a mold and cool to room temperature to obtain a non-uniform white shampoo bar with a brittle texture.

Comparative example 2:

Table 7: Components used to prepare shampoo

method:

1. Mix components Nos. 1 to 6 together and heat them to a temperature of about 85°C;

2. Add components No. 7-10 to the heated components No. 1 to 6 while stirring while maintaining a temperature of about 85°C;

3. Evaporate about 82.7 g of excess water to obtain a solution;

4. The solution was poured into a mold and allowed to cool to room temperature to obtain a biphasic product (wherein the upper phase was a soft film and the lower phase was a flowable viscous liquid) and no lumps in solid form formed.

Comparative example 3

Table 8: Components used to prepare shampoo

method:

1. Mix components Nos. 1 to 6 together and heat them to a temperature of about 85°C;

2. Add component No. 7 to the heated components No. 1 to 6 while stirring, while maintaining a temperature of about 85°C;

3. Mix components Nos. 8-11 and 14-16 together and add them to the heated components Nos. 1 to 7 while stirring to obtain a solution i) at a temperature of about 85°C;

4. Mix components no. 12 to 13 and heat them to about 85° C. to obtain solution ii);

5. Slowly add solution i) to solution ii) while stirring while maintaining a temperature of about 85°C; as solution i) is added, solid matter immediately forms and aggregates in solution ii); in solution i ) was complete, a non-uniform, partially clear, solid shampoo bar formed in the container and could not be discharged into the mold.

conditioning properties

A. Wet combability

Material:

Shampoo bar produced according to Example 1,

· SK EC Hydro force shampoo, liquid,

SK beology aqua shampoo, liquid,

· Hair sample: Kerling International (Backnang, Germany), Chinese natural hair, lot number 04/2016, N142, length 12cm, weight 1+/-0.05g,

(Hamburg，Germany)，硬橡胶梳，细齿Comb: Hercules

(Hamburg, Germany), ebonite comb, fine teeth

· Installation: Custom machine for automatic carding.

Test procedure:

• Pretreatment of the tresses: 10 tresses were used for reference and another 10 tresses were used for product application. Hair was moderately bleached and stored at 25°C and 25% RH for at least 48 hours. Shortly before the determination of the combing force, the reference tresses were soaked in water for 5 minutes.

・Application of shampoo

Shampoo Bar: Dissolve 0.17g/g of hair shampoo in water (3.4g in 10ml) and apply to damp hair and work in thoroughly. After 2 min, the tresses were rinsed for 18 seconds under standard conditions (tap water at 32°C, 0.5 L/min) while being automatically combed. Apply the shampoo block twice.

Liquid Shampoo: 0.25g/g hair shampoo is applied to damp hair. After 2 min, the tresses were rinsed for 18 seconds under standard conditions (tap water at 32°C, 0.5 L/min) while being automatically combed. Apply shampoo twice.

·Measurement of wet combing work

Each tress was combed and wetted for 2 seconds before the measurement began.

After three pre-comb strokes, each tress was combed 10 times while slowly rotating the tresses. The average value of the work of combing was determined (see Figure 2).

The smaller the work value, the better the wet combability. As shown in Figure 2, the clear bar showed better wet combability than the other two liquid shampoos of the prior art.

B. Dry combability

Except for SK beology aqua shampoo, the material and pretreatment of the hair tresses and the application of the shampoo were the same as those stated in wet combing.

The tresses were stored at 25°C and 25% RH for at least 24 hours before measurement. Before measuring, remove each tress.

After the three precombing passes, each tress was combed 10 times while rotating the tresses slowly. The median value of the combing work was determined (see Figure 3). It can be seen that the clear bar of the present invention has comparable dry combability to prior art liquid shampoos.

C. Smoothness of hair

raw material:

Shampoo bar produced according to Example 1,

· LUSH Shampoo,

· Hair bundle from Hai chuan jin rong fa zhi pin, Shandong China.

Two tresses (length: 25 cm, weight: 4 g) were bleached once, towel-dried and blow-dried, then left at room temperature for at least 48 hours. Apply 0.5g shampoo bars directly to damp hair and mix well. Then, the hair tresses were rinsed for 1 minute under the same conditions (tap water at 32° C., 0.5 L/min). Apply the shampoo block twice.

10 volunteers evaluated two wet hair tresses treated with different shampoo blocks by their fingers and combs, and selected the better tress (smoother or softer), 3 times per volunteer .

All 10 agreed that, for wet hair, the hair treated with the shampoo bar according to Example 1 was smoother than the hair treated with the Lush shampoo bar.

D. Detergency

raw material:

Shampoo bars produced according to Examples 1 and 3-5,

· LUSH Shampoo,

SK beology aqua shampoo, liquid,

· Hair bundle from Hai chuan jin rong fa zhi pin, Shandong China.

Weigh and record the weight of the hair tress (M1), then apply 0.5g (M2) of artificial sebum evenly on the dry hair, then wet the hair tress with the same amount of water, and apply 0.3g of shampoo (M3) Apply to damp hair, wash hair gently for 30 seconds, then rinse under the same conditions for 1 minute. The treated tresses were stored at 25°C and 25% RH for at least 48 hours and weighed (M4).

Calculate the amount of sebum removed by using the following formula:

DP=(M1+M2-M4)/M3

in,

-DP is detergency, which means the amount of sebum that can be washed off per gram of shampoo,

- M1 is the weight of the tress,

- M2 is the weight of artificial sebum actually applied,

-M3 is the weight of the shampoo actually used,

- M4 is the weight of the hair tress after drying.

The test results are shown below.

As shown in the table, the detergency of each bar of the present invention is good and comparable to the prior art shampoos.

While a few preferred embodiments have been described, many modifications and variations are possible in light of the above teachings. It is therefore to be understood that the invention may be practiced otherwise than as specifically described without departing from the scope of the appended claims.

Claims (20)

1. A method for producing transparent shampoo bars, said method comprising: i) preparation of a solution i) comprising at least one N-acylamino acid and water, said solution i) having a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, ii) preparing a solution ii) comprising at least one base and water, said solution ii) having a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, iii) adding said solution ii) to said solution i) while stirring at a temperature of 70°C to 100°C, preferably 75°C to 90°C, more preferably 80°C to 88°C, to obtain a homogeneous clear solution iii); and iv) cooling said solution iii) to room temperature, in a) at least one alcohol is contained in said solution i) and/or said solution ii) and/or said solution iii), b) said water is contained in a total amount of not more than 40% by weight, preferably not more than 30% by weight, based on the total weight of said transparent shampoo bar, and c) Optionally, a second surfactant and/or a hair conditioning compound is included in said solution i) and/or said solution ii) and/or said solution iii). 2. A transparent shampoo block, the transparent shampoo block comprising: - a salt formed in situ from at least one N-acylamino acid and at least one base, -water, - at least one alcohol, - optionally present a second surfactant, and - Optionally present a hair conditioning compound. 3. A method according to claim 1 or a clear shampoo bar according to claim 2, wherein said at least one N-acyl amino acid is selected from the group consisting of N-acyl glutamic acid, N-acyl alanine, N - Acylglycine, N-acyllysine, N-acylproline and N-acylsarcosine. 4. A method according to claim 1 or 3 or a clear shampoo bar according to claim 2 or 3, wherein the acyl group in the N-acyl amino acid is an aliphatic having 6 to 22 carbon atoms Acyl. 5. A method according to any one of claims 1 and 3 to 4 or a clear shampoo bar according to any one of claims 2 to 4, wherein the at least one N-acylamino acid is selected from the group consisting of coconut Oleoyl glutamate, lauroyl glutamate, stearoyl glutamate, myristoyl glutamate, palmitoyl glutamate, oleoyl glutamate, cocoyl alanine, lauroyl alanine , Stearoyl Alanine, Myristoyl Alanine, Palmitoyl Alanine, Oleoyl Alanine, Cocoyl Glycine, Lauroyl Glycine, Stearoyl Glycine, Myristoyl Glycine, Palmitoyl Glycine, Oleoyl Glycine, Cocoyl Lysine, Lauroyl Lysine, Stearoyl Lysine, Myristoyl Lysine, Palmitoyl Lysine, Oleoyl Lysine, Cocoyl Proline, Lauroyl proline, stearoyl proline, myristoyl proline, palmitoyl proline, oleoyl proline, cocoyl sarcosine, lauroyl sarcosine, stearoyl sarcosine Acid, Myristoyl Sarcosine, Palmitoyl Sarcosine, and Oleoyl Sarcosine. 6. A method according to any one of claims 1 and 3 to 5 or a clear shampoo bar according to any one of claims 2 to 5, wherein the at least one base is selected from aminomethylpropane Alcohol, Aminoethyl Propanol, Triethanolamine, Ethanolamine, Diethanolamine, Tetrahydroxypropylethylenediamine, Potassium Hydroxide, Sodium Hydroxide, and Sodium Bicarbonate. 7. A method according to any one of claims 1 and 3 to 6 or a clear shampoo bar according to any one of claims 2 to 6, wherein said at least one alcohol is selected from aliphatic alcohols with carbon atoms. 8. A method according to any one of claims 1 and 3 to 7 or a clear shampoo bar according to any one of claims 2 to 7, wherein the at least one alcohol is selected from ethanol (denatured) , ethylene glycol, propylene glycol such as 1,3-propanediol, butanediol such as 1,2-butanediol, 2,3-butanediol, 1,4-butanediol, such as 1,2-pentanediol Alcohols, isopentyl glycol, pentanediol of 1,5-pentanediol, hexanediol of 1,2-hexanediol, hexanediol of 1,6-hexanediol, octanediol, such as 1,9-nonanediol Diols such as nonanediol, decanediol such as 1,10-decanediol, glycerin, sorbitol, diethylene glycol, and dipropylene glycol. 9. A method according to any one of claims 1 and 3 to 8 or a transparent shampoo bar according to any one of claims 2 to 8, wherein based on the total weight of the transparent shampoo bar, the The at least one alcohol is contained in an amount of 5% to 30% by weight, preferably 10% to 20% by weight. 10. A method according to any one of claims 1 and 3 to 9 or a clear shampoo bar according to any one of claims 2 to 9, wherein the hair conditioning compound is selected from cationic polymers, Fatty acid esters, oils and plant extracts with hydrophilic groups. 11. A method according to any one of claims 1 and 3 to 10 or a clear shampoo bar according to any one of claims 2 to 10, wherein the second surfactant is selected from anionic surfactants agents, amphoteric surfactants and glucoside derivatives. 12. A method according to any one of claims 1 and 3 to 11 or a transparent shampoo bar according to any one of claims 2 to 11, wherein based on the total weight of the transparent shampoo bar, the The hair conditioning compound is included in an amount of 0% to 30% by weight, preferably 0.1% to 20% by weight, more preferably 0.2% to 10% by weight. 13. A method according to any one of claims 1 and 3 to 12 or a clear shampoo bar according to any one of claims 2 to 12, wherein based on the total weight of the clear shampoo bar, the The second surfactant is included in an amount of 0% to 25% by weight, preferably 5% to 20% by weight. 14. A method according to any one of claims 1 and 3 to 13 or a clear shampoo bar according to any one of claims 2 to 13, wherein the at least one base comprises triethanolamine. 15. A method according to any one of claims 1 and 3 to 14 or a clear shampoo bar according to any one of claims 2 to 14, wherein the at least one base is triethanolamine or triethanolamine Combinations with bases other than triethanolamine, such as triethanolamine with aminomethylpropanol, triethanolamine with aminoethylpropanol, or triethanolamine with ethanolamine and/or diethanolamine and/or tetrahydroxypropanol Combinations of ethylenediamines. 16. The method according to any one of claims 1 and 3 to 15, wherein the at least one base is present in an amount of 5% to 30% by weight, preferably 10% by weight, based on the total weight of the transparent shampoo bar Amounts of from 25% to 25% by weight are used. 17. The method according to any one of claims 1 and 3 to 16, wherein said at least one N-acyl amino acid is present in an amount of 10% to 50% by weight, preferably An amount of 15% to 40% by weight is used. 18. The transparent shampoo bar according to any one of claims 2 to 15, wherein said transparent shampoo bar is formed in situ from at least one N-acylamino acid and at least one base, based on the total weight of said transparent shampoo bar. The salt of is contained in an amount of 15% to 80% by weight, preferably 20% to 55% by weight. 19. A transparent shampoo bar produced by the method according to any one of claims 1 and 3 to 17. 20. A two-layer shampoo and conditioning bar comprising on one side a hair dryer according to any one of claims 2 to 15 and 18 to 19 or any one of claims 1 and 3-17 A clear shampoo block and a hair conditioning block on the other side produced by the method described in item 1.

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