Exfoliating scrub

Abstract

The present invention provides an exfoliating scrub, which contains a sugar alcohol as an abrasive, a polyol as a base, and a thickener. The sugar alcohol is at least one selected from erythritol and xylitol. The polyol is a polyol that is liquid at 25 °C. Based on the total amount of the exfoliating scrub, the content of the sugar alcohol is 15 to 70% by weight. The thickener is a thickener containing a structural unit represented by the following formula (1), wherein X is OH, ONa, OK, OR 1 or R 2 , R 1 may be an alkyl group, an amino group or a substituted amino group having 1 to 30 carbon atoms, and R 1 may be an amino group, a substituted amino group, a dimethyltaurinate group, a dimethyltaurate potassium group or a dimethyltaurine ammonium group. The exfoliating scrub substantially does not contain water. The exfoliating scrub of the present invention has excellent usability during use, and the product performance is stable, and the appearance or performance is not easily reduced even after long-term storage.

Description

Technical Field

[0001] The present invention relates to the field of cosmetics, and particularly to a scrub for exfoliation. Background Art

[0002] The skin of the human body is an important organ that protects the human body against and alleviates external stimuli, and is also an important factor in presenting people's images. The outermost layer of the skin is the stratum corneum, and its metabolic renewal cycle is generally about 4 weeks. If it is not updated in time, it will lead to severe hyperplasia of the stratum corneum, which not only affects the beauty of the skin, but also causes the growth of germs and thus leads to skin lesions. Therefore, it is necessary to help the skin remove the excess stratum corneum in daily life. As a method for removing the stratum corneum, the most commonly used way is to massage the skin with a scrub containing an abrasive on the skin to remove the excess stratum corneum by physical friction.

[0003] In the field of cosmetics, scrubs for exfoliation usually contain an abrasive and a base as its carrier. As a scrub for exfoliation, on the one hand, it is required to effectively remove the excess cutin, and on the other hand, users also hope to experience a good sense of use during and after use. In response to these needs, various scrubs have been developed.

[0004] For example, in Patent Document 1 (CN111346024A), a facial scrub for exfoliation using erythritol and cellulose as abrasives and an oily solvent as a base is disclosed; in Patent Document 2 (CN103462816A), an exfoliating lip balm using edible sugars or natural plant abrasive particles as abrasives and an oily base is disclosed; in Patent Document 3 (CN103349642A), a scrub using sugar as an abrasive and an aqueous base is disclosed.

[0005] Prior Art Documents

[0006] Patent Documents

[0007] Patent Document 1: CN111346024A

[0008] Patent Document 2: CN103462816A

[0009] Patent Document 3: CN103349642A Summary of the Invention

[0010] Problems to be Solved by the Invention

[0011] However, an oily base is used in the products disclosed in Patent Document 1 and Patent Document 2. When these products are used, they will bring unpleasant tactile sensations to the user, such as stickiness or greasiness, thus reducing the user's experience. In addition, a large amount of edible sugar is used as an abrasive in the products disclosed in Patent Document 2 and Patent Document 3. As sugar is a nutrient for microorganisms such as bacteria, there is a problem that microorganisms are likely to grow, which is not conducive to the preservation of the product.

[0012] On the other hand, although sugar alcohol abrasives are not likely to breed microorganisms, due to solubility, in order to maintain the granularity of the abrasive, an oily base is usually used. If an aqueous base is used, there are problems such as the abrasive particles being prone to dissolution and aggregation, which are not conducive to long-term preservation.

[0013] In addition, in the face of the fierce competition environment in the cosmetics industry, for cosmetics manufacturers, they also hope to further improve the user experience of their own products, so as to gain an advantage in the fierce market competition.

[0014] Therefore, the object of the present invention is to provide an exfoliating scrub that has a sufficient effect of removing cutin, enables the user to feel a comfortable use experience, and is easy to preserve and has good stability.

[0015] Technical means for solving the problem

[0016] The inventors of the present invention conducted repeated studies on the problems existing in the prior art and found that by using erythritol and / or xylitol particles as abrasives, using polyols as the base, and substantially not containing water in the composition of the scrub, a good use experience can be achieved, and its characteristics can be maintained even after long-term preservation, thus solving the above problems. Moreover, the inventors of the present invention unexpectedly found that for the scrub having the specific composition of the present invention, the user can feel an obvious sense of heat during use, which not only improves the comfort of the user during use, but also helps the microcirculation of the skin and is beneficial to eliminating problems such as skin edema. And the user can feel a sense of coolness when rinsing. And after rinsing is completed, the user can feel an obvious sense of moisture. The inventors of the present invention completed the present invention based on the above findings.

[0017] The present invention specifically relates to the following aspects:

[0018] [1]: An exfoliating scrub, which contains sugar alcohol as an abrasive, polyol as a base, and a thickener. The sugar alcohol is at least one selected from erythritol and xylitol. The polyol is a polyol that is liquid at 25 °C. Based on the total amount of the exfoliating scrub, the content of the sugar alcohol is 15 to 70% by weight. The thickener is a thickener in which a structural unit represented by the following formula (1) is introduced, and the exfoliating scrub substantially does not contain water.

[0019]

[0020] Among them, X is OH, ONa, OK, OR 1 or R 2 ,R 1 can be an alkyl group, an amino group or a substituted amino group having 1 to 30 carbon atoms, R 2 can be an amino group, a substituted amino group, a sodium dimethyltaurate group, a potassium dimethyltaurate group or an ammonium dimethyltaurate group.

[0021] [2]: The exfoliating scrub according to the foregoing [1], wherein the polyol is at least one selected from glycerol, polyethylene glycol, butanediol, propylene glycol, dipropylene glycol and diglycerol.

[0022] [3]: The exfoliating scrub according to the foregoing [1] or [2], wherein the thickener is selected from carbomer, dimethylacrylamide / sodium acryloyldimethyltaurate cross-linked polymer, polyacrylate cross-linked polymer-11, ammonium acryloyldimethyltaurate / behenyl alcohol polyether-25 methacrylate cross-linked polymer, polyacrylic acid / C10-30 alkyl acrylate, sodium acryloyldimethyltaurate, (ammonium acryloyldimethyltaurate / vinylpyrrolidone) copolymer and (ammonium acryloyldimethyltaurate / carboxyethyl acrylate) cross-linked polymer.

[0023] Advantages of the Invention

[0024] The exfoliating scrub according to the present invention does not feel sticky or greasy during use, and the product performance is stable, and the appearance or performance is not easily reduced even after long-term storage. In addition, when using the scrub of the present invention, the user can feel heat, which helps the microcirculation of the skin and is beneficial to eliminating skin discomfort such as edema. Moreover, since sugar alcohols are used as abrasives, a cool feeling can be brought to the user after rinsing. Detailed Embodiments

[0025] Hereinafter, the composition and effects of the exfoliating scrub of the present invention will be described in detail.

[0026] The exfoliating scrub of the present invention contains sugar alcohol as an abrasive, polyol as a base, and a thickener. The sugar alcohol is at least one selected from erythritol and xylitol. The polyol is a polyol that is liquid at 25°C. Based on the total amount of the exfoliating scrub, the content of the sugar alcohol is 15 to 70% by weight. The thickener is a thickener containing the structural unit shown in the above formula (1) in its molecule. The thickener is used to make the viscosity of the scrub system at the required level, and the amount of the thickener can be appropriately determined according to the requirements for the characteristics of the final product. Substantially no water is contained in the exfoliating scrub.

[0027] (A) Abrasive

[0028] In the present invention, erythritol and / or xylitol particles are selected as the abrasive. On the one hand, because erythritol and xylitol are solid at room temperature, their particles have suitable hardness and strength for use as an exfoliating abrasive. On the other hand, erythritol and xylitol themselves have a moisturizing effect, and even after rinsing with water after use, they can bring a moist feeling and a cool feeling to the user.

[0029] In the exfoliating scrub of the present invention, regarding the content of the abrasive, when the total amount of the scrub is regarded as 100% by weight, the content range of the abrasive is 15 to 70% by weight, preferably 20 to 60% by weight, and more preferably 30 to 50% by weight.

[0030] By making the content of the abrasive within the above range, the scrub can have sufficient exfoliating ability and it is easy to obtain a stable scrub.

[0031] Regarding the particle size of the abrasive particles used in the present invention, there is no particular limitation. From the viewpoints of exfoliating effect and use feeling, it is preferably in the range of 50 to 2000 μm, and more preferably 100 to 1000 μm.

[0032] (B) Base

[0033] In the exfoliating scrub of the present invention, a polyol is used as the base. Since the polyol is hydrophilic, an unpleasant touch such as a greasy feeling or stickiness is not felt during use. Moreover, the polyol itself has the function of a moisturizer, so the user can maintain a moist feeling and a cool feeling on the skin after use. In particular, since the abrasive used in the present invention also has a moisturizing effect, the user can feel a sufficient moist feeling and a cool feeling even after rinsing with water after use.

[0034] As such a polyol, as long as it is a polyol that is liquid at 25°C, there is no particular limitation. For example, a diol, a polyol with three or more hydroxyl groups can be used.

[0035] Examples of the diol may include ethylene glycol, diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, 1,2-propanediol, 1,3-propanediol, dipropylene glycol, polypropylene glycol, 1,3-butanediol, 1,2-butanediol, 1,4-butanediol, 2,3-butanediol, etc. Examples of the polyol having three or more hydroxyl groups may include glycerin, diglycerin, etc. These polyols may be used alone or in combination of two or more.

[0036] Among them, from the viewpoints of usability and stability, polyethylene glycol, butanediol, propanediol, dipropylene glycol, diglycerin, and glycerin are preferred. In addition, for the scrub cream of the present invention containing these polyols and the above-mentioned abrasive, when the user massages the skin with the scrub cream, an obvious sense of heat can be felt, which can not only make the user feel more comfortable, but also contribute to improving the microcirculation of the skin, and is also beneficial to eliminating discomfort such as skin edema.

[0037] It should be noted here that the "base agent" in this article refers to the solvent component used as the carrier for carrying the abrasive.

[0038] In the present invention, the above-mentioned polyol is used as the base agent, and the scrub cream substantially does not contain water. Here, "substantially does not contain water" means that the water content in the scrub cream is less than 5% by weight, preferably less than 2% by weight, and more preferably less than 1% by weight. This is because the abrasive used in the present invention is erythritol and / or xylitol, which is water-soluble. When the water content in the scrub cream is too high, it will promote the dissolution of the abrasive particles, or cause particle aggregation due to partial dissolution-reprecipitation of the particles, thereby reducing the stability of the scrub cream and being unfavorable for the preservation of the scrub cream. In addition, the water content here not only refers to the water added alone in the scrub cream, but also includes the water contained in the solution when other components are aqueous solutions.

[0039] (C) Thickener

[0040] In the scrub cream of the present invention, the thickener is used to make the viscosity of the scrub cream system at the required level, and the amount of the thickener can be appropriately determined according to the needs of the characteristics of the final product. In addition, since both the abrasive and the base agent used in the present invention belong to alcohols, from the viewpoints of the appearance and storage stability of the scrub cream, the thickener used in the present invention is a thickener in which a structural unit represented by the following formula (1) is introduced into the thickener molecule.

[0041]

[0042] Among them, X is OH, ONa, OK, OR 1 or R 2 , R 1 may be an alkyl group, an amino group or a substituted amino group having 1 to 30 carbon atoms, R2 It can be an amino group, a substituted amino group, a sodium dimethyltaurate group, a potassium dimethyltaurate group or an ammonium dimethyltaurate group.

[0043] As specific examples of the thickener that can be used in the abrasive cream of the present invention, carbomers having an acrylic acid structure ( Lubrizol Specialty Chemicals), dimethylacrylamide / sodium acryloyldimethyltaurate cross-linked polymer having an acrylamide structure (SUpolymer G-1, Toho Chemical), polyacrylate cross-linked polymer-11 having an acrylate structure (Aristoflex (registered trademark) Velvet, Clariant Japan Co., Ltd.), acryloyldimethyltaurine ammonium / behenyl alcohol polyether-25 methacrylate cross-linked polymer (Aristoflex (registered trademark) HMB, Clariant Japan Co., Ltd.), polyacrylic acid / C10-30 alkyl acrylate (Ultrez, Lubrizol Specialty Chemicals), sodium acryloyldimethyltaurate (Aristoflex (registered trademark) silk, Clariant Japan Co., Ltd.), (acryloyldimethyltaurine ammonium / vinylpyrrolidone) copolymer (Aristoflex (registered trademark) AVC, Clariant Japan Co., Ltd.), (acryloyldimethyltaurine ammonium / carboxyethyl acrylate) cross-linked polymer (Aristoflex (registered trademark) TAC, Clariant Japan Co., Ltd.). At the same time, it is not limited to polyacrylic acid, and neutralized polyacrylate salts are also included.

[0044] Regarding the amount of the thickener used, it should be noted that the addition amount of the thickener in the abrasive cream is related to the content of the abrasive particles. As long as the final viscosity of the abrasive cream can meet the viscosity requirements for cosmetic use, it can be adjusted according to actual needs. Therefore, the content of the thickener is not specifically limited here. However, as an exemplary range of the thickener content, ranges such as 1.75% by weight or less, 0.2 - 1.0% by weight, 0.4 - 0.6% by weight, etc. relative to the whole abrasive cream can be cited.

[0045] (D) Other components

[0046] In the present invention, in addition to the above components, components commonly used in cosmetics can be blended within the range that does not impair the effects of the present invention. As other components, for example, surfactants, skin conditioners, moisturizers, preservatives, metal ion chelators, pigments, pH regulators, skin nutrients, vitamins, fragrances, etc. can be cited. These components and their addition amounts can be selected according to actual needs.

[0047] The preparation method of the scrub of the present invention is not particularly limited. For example, a method of uniformly mixing the above-mentioned components to form a scrub can be used. The appearance of the scrub of the present invention can be a transparent or semi-transparent fluid state, a transparent or semi-transparent gel state, or a moist granular state.

[0048] The scrub of the present invention can be used in a conventional manner. For example, the scrub can be directly applied to the skin, massaged for a certain period of time, and then washed off with water. It is preferred to first clean the skin or wet the skin with water before using the scrub.

[0049] Examples

[0050] The present invention will be described in more detail below through specific examples, but the present invention is not limited to the following specific examples.

[0051] <Preparation of scrub>

[0052] Measure each component according to the components and compounding amounts shown in Table 1 and Table 2 below, and then uniformly mix the components to form a uniform composition, thereby obtaining Examples 1 to 5 and Comparative Examples 1 to 5. The content of each component in the following table is expressed in "wt%". Then, the obtained composition was evaluated according to the following evaluation method, and the evaluation results are shown in Tables 3 and 4. All raw materials used in the examples are commercially available products.

[0053] Table 1-1

[0054]

[0055]

[0056] Table 1-2

[0057]

[0058] Table 2

[0059]

[0060]

[0061] <Evaluation of usability>

[0062] Twenty reviewers used the test samples, applied the test samples on the skin, massaged them, and then washed off the test samples. A questionnaire survey was conducted on the feelings during and after use, and the evaluation was carried out according to the following criteria.

[0063] (Regarding the heat sensation during use): If 16 or more reviewers felt a heat sensation, it was evaluated as "○"; if 10 to 15 reviewers felt a heat sensation, it was evaluated as "△"; if 9 or fewer reviewers felt a heat sensation, it was evaluated as "×".

[0064] (Regarding graininess during use): If more than 16 reviewers feel obvious graininess, it is evaluated as "○"; if 10 - 15 reviewers feel graininess, it is evaluated as "△"; if less than 9 reviewers feel graininess, it is evaluated as "×".

[0065] (Regarding cool feeling during rinsing): If more than 16 reviewers feel obvious cool feeling, it is evaluated as "○"; if 10 - 15 reviewers feel cool feeling, it is evaluated as "△"; if less than 9 reviewers feel cool feeling, it is evaluated as "×".

[0066] (Regarding moisturizing feeling after rinsing): If more than 16 reviewers feel obvious moisturizing feeling, it is evaluated as "○"; if 10 - 15 reviewers feel moisturizing feeling, it is evaluated as "△"; if less than 9 reviewers feel moisturizing feeling, it is evaluated as "×".

[0067] (Regarding no sticky feeling after rinsing): If more than 16 reviewers feel no sticky feeling, it is evaluated as "○"; if 10 - 15 reviewers feel no sticky feeling, it is evaluated as "△"; if less than 9 reviewers feel no sticky feeling, it is evaluated as "×".

[0068] <Stability evaluation>

[0069] Put the test sample into a transparent glass bottle, place it in an oven at 60°C for 7 days, then take it out and let it return to room temperature. Observe the state visually, take out the sample in the bottle and apply it on a blackboard to observe the grain condition. Evaluate according to the following criteria.

[0070] If no obvious change is seen, it is evaluated as "○"

[0071] If grain melting or grain aggregation and sedimentation occur, it is evaluated as "×".

[0072] As can be seen from Tables 1 - 3 above, when using the scrub cream of the present invention in the present invention, the subjects can feel excellent use feeling, and the scrub cream has excellent storage stability.

[0073] In addition, in the case of Comparative Example 1 using sorbitol as a base, the subjects do not feel a sense of heat, and the scrub cream becomes uneven. In the case of Comparative Example 2 using trehalose as an abrasive, the graininess is weak, and the grains melt after high-temperature storage. In the case of Comparative Example 3 with an increased water content in the system, the composition becomes turbid and cannot achieve the use feeling of the present invention. In the case of Comparative Example 4 using xanthan gum as a thickener, the composition becomes turbid and cannot achieve the use feeling of the present invention. In the case of Comparative Example 5 using dextrin palmitate as a thickener, the thickener cannot dissolve and the composition cannot achieve the use feeling of the present invention.

[0074] Although the composition and effects of the present invention have been described above with specific embodiments, those skilled in the art can make substitutions and changes in components and contents based on the idea of the present invention without departing from the idea of the present invention, and the solutions after these substitutions and changes are also included within the scope of the present invention.

Claims

1. An exfoliating scrub, which contains sugar alcohol as an abrasive, polyol as a base, and a thickener. The sugar alcohol is at least one selected from erythritol and xylitol, and the polyol is a polyol that is liquid at 25 °C. Based on the total amount of the exfoliating scrub, the content of the sugar alcohol is 15 to 50% by weight, and the content of the thickener is 0.2 to 1.0% by weight. The thickener is a thickener selected from carbomer, dimethylacrylamide / sodium acryloyldimethyltaurate cross-linked polymer, acrylic acid / C10-30 alkyl acrylate cross-linked polymer, and sodium polyacryloyldimethyltaurate. The content of water in the exfoliating scrub is less than 5% by weight.

2. The exfoliating scrub according to claim 1, wherein the polyol is at least one selected from glycerol, polyethylene glycol, butanediol, propylene glycol, dipropylene glycol, and diglycerol.

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