Anhydrous cleansing product with warm feel

Abstract

This invention relates to the field of cosmetics technology and discloses a waterless cleansing product with a warming sensation. By weight percentage, it comprises 30%–80% polyhydroxy polyether, 1%–10% higher fatty alcohol fatty acid esters, 0.05%–10% polymeric thickener, and 1%–20% foaming surfactant. The polyhydroxy polyether is selected from at least one of dihydroxy polyether, trihydroxy polyether, or hexahydroxy polyether; the higher fatty alcohol fatty acid ester has a melting point in the range of 25–35°C. The waterless cleansing product provided by this invention achieves a warming sensation that is easily and noticeably perceived by the skin through the synergistic effect of polyhydroxy polyethers and higher fatty alcohol fatty acid esters. This warming sensation is relatively mild and long-lasting, without causing burning or stinging sensations to the skin. When the cleansing product of this invention is applied to the face, the skin pores are opened, allowing the cleansing surfactant ingredients to penetrate the pores more easily, thereby achieving deep cleansing and blackhead removal.

Description

Technical Field

[0001] This invention relates to the field of cosmetics and skincare technology, and in particular to a waterless cleansing product with a temperature-sensitive function. Background Technology

[0002] While facial cleansers can remove surface dirt and some oil, they rarely penetrate deep into pores for a thorough cleanse, let alone remove blackheads. This demand has led to the development of deep-cleansing masks that target pores. Most cleansing masks on the market use porous absorbent materials like kaolin, bentonite, and charcoal to absorb oil and blackheads. While these have some effect, they still fall short of meeting consumers' true needs. Achieving deep cleansing and even blackhead removal remains a pressing issue for the skincare industry.

[0003] Blackheads are hard, concrete-like substances formed by sebum, dead skin cells, and some fungi and bacteria intertwined. They get stuck in open pores, making them difficult to remove and clogging the pores. This prevents ordinary cleansing ingredients from penetrating and dissolving the blackheads at their root, making them difficult to remove. The most effective way to remove blackheads is to allow cleansing ingredients to penetrate the pores, dissolve the blackheads, and open the pores. Currently, using skin warming agents to apply heat to the pores is considered one of the best methods to open them.

[0004] However, the mainstream warming agents on the market are mainly neuromodulators (such as vanillyl butyl ether) or inorganic salts / zeolite materials. When these two types of materials come into contact with the skin, although they can generate heat, the former mainly relies on neuromodulation and has little effect on actually opening pores, while the latter releases heat too rapidly, often within a few seconds, resulting in excessively concentrated heat accompanied by burning and stinging sensations. This is neither gentle nor safe for the skin. Summary of the Invention

[0005] The purpose of this invention is to provide a waterless cleaning product with a temperature-sensitive function to solve the problems of skin pores and blackheads.

[0006] To address the aforementioned technical problems, this invention provides a temperature-sensitive waterless cleaning product, comprising, by weight percentage: 30%–80% polyhydroxy polyether; 1%–10% higher fatty alcohol fatty acid ester; 0.05%–10% polymeric thickener; and 1%–20% foamable surfactant; wherein the polyhydroxy polyether is selected from at least one of dihydroxy polyether, trihydroxy polyether, or hexahydroxy polyether; and the melting point of the higher fatty alcohol fatty acid ester is in the range of 25–35°C.

[0007] Compared to existing technologies, this invention provides a waterless cleansing product that can be clearly felt by the skin and provides gentle, continuous heat. In the waterless cleansing product provided by this invention, polyhydroxy polyethers within a specific content range work synergistically with higher fatty alcohol fatty acid esters to achieve a temperature sensation that is easily and clearly felt by the skin. Specifically, the skin can clearly perceive an increase in epidermal temperature. More importantly, this heat release is gentle and long-lasting, without causing burning or stinging sensations to the skin.

[0008] In this invention, the synergistic mechanism of the warming effect provided by the polyhydroxy polyether and higher fatty alcohol fatty acid esters is as follows: The higher fatty alcohol fatty acid esters used in this invention have melting points close to human skin temperature. When the cleansing product of this invention is applied to a dry face, the higher fatty alcohol fatty acid esters melt and absorb heat immediately upon contact with the skin, lowering the skin temperature. At this time, the polyhydroxy polyether component slowly penetrates into the skin pores, interacting with the moisture in the pores through hydrogen bonds, generating heat. There is a time difference between the melting and heat absorption of the higher fatty alcohol fatty acid ester component and the heat generation of the polyhydroxy polyether component. Thus, the skin experiences two processes: an initial temperature decrease and an increase in temperature due to external heat. This increases the temperature difference on the skin surface, resulting in a greater warming sensation than a cooling sensation, manifesting as a continuous and gentle warming feeling.

[0009] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the polyhydroxy polyether is selected from at least one of glycerol polyether-7, glycerol polyether-12, glycerol polyether-26 or methyl glucetol polyether-20; more preferably, the polyhydroxy polyether is glycerol polyether-26 to provide better skin warming effect.

[0010] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the mass percentage of the polyhydroxy polyether can be 40% to 50%.

[0011] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the higher fatty alcohol fatty acid ester is formed by the condensation of higher fatty alcohol and higher fatty acid, wherein the higher fatty alcohol has the general formula R1-OH, wherein R1 is a saturated or unsaturated C12-C30 straight-chain hydrocarbon group, and wherein R1 is unsubstituted or substituted by one or more hydroxyl groups; the higher fatty acid has the general formula R2-COOH, wherein R2 is a saturated or unsaturated C12-C30 straight-chain hydrocarbon group, and wherein R2 is unsubstituted or substituted by one or more carboxyl groups.

[0012] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the higher fatty alcohol fatty acid ester is selected from at least one of myristyl myristate, cetyl ricinoleate, isostearyl myristate, stearyl lactate, stearyl heptanoate, stearyl octanoate, or cetyl octanoate; preferably, the higher fatty alcohol fatty acid ester is a mixture of stearyl heptanoate and stearyl octanoate.

[0013] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the mass percentage of the higher fatty alcohol fatty acid ester is 3% to 5%.

[0014] When the waterless cleaning product with temperature sensitivity provided by this invention is a paste-like facial cleanser or a mud-like clay film, a polymer thickener is required for thickening. Preferably, in the waterless cleaning product with temperature sensitivity provided by this invention, the polymer thickener is selected from at least one of starch-based thickeners, natural gum-based thickeners, or ion-resistant polymer thickeners; more preferably, the polymer thickener is an ion-resistant polymer thickener, which is selected from at least one of dibutyllauroyl glutamine, dibutylethylhexanoyl glutamine, hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer, or polyacrylate crosslinker-6.

[0015] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the mass percentage of the polymer thickener is 1% to 3%.

[0016] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the foaming surfactant is selected from at least one of amphoteric or amphoteric surfactants, anionic surfactants, nonionic surfactants, or mixtures thereof; more preferably, the foaming surfactant is selected from anionic surfactants; more preferably, the foaming surfactant is one of sodium cocoyl glycinate and sodium lauroyl glutamate, or a mixture thereof, thereby enabling the waterless cleaning product with temperature sensitivity provided by the present invention to achieve better deep cleaning and blackhead removal effects.

[0017] Preferably, in the waterless cleaning product with temperature sensitivity provided by the present invention, the mass percentage of the foamable surfactant is 6% to 10%.

[0018] Preferably, the waterless cleansing product with a warming sensation provided by the present invention further includes C2-C10 polyol. Preferably, the C2-C10 polyol is selected from at least one of butylene glycol, propylene glycol, dipropylene glycol, or PEG-8. The polyhydroxy polyether and the C2-C10 polyol are compounded. The addition of the C2-C10 polyol can help to further enhance the warming effect on the skin and improve the moisturizing feel after washing.

[0019] Preferably, the waterless cleansing product with temperature sensitivity provided by the present invention may further include one or more of the following: a humectant, a colorant, a stabilizer, an exfoliant, a filler, or an adsorbent. For example, the humectant may be glycerin. Furthermore, the raw materials added in the present invention are preferably dry powders or anhydrous liquids. Preferably, the adsorbent is selected from at least one of kaolin, bentonite, or charcoal; the mass percentage of the adsorbent is 1% to 30%, more preferably 5% to 25%, and even more preferably 10% to 20%. Without the addition of an adsorbent, the waterless cleansing product with temperature sensitivity provided by the present invention is a transparent or opaque gel, or a cream / paste. When the above-mentioned adsorbent is added to the formula, it can be used as a mud-like cleansing mask.

[0020] The cleansing product provided by this invention has a unique method of use, suitable for use on dry hands and face. Specifically, first apply an appropriate amount of cleansing product to the face. A warming sensation will be generated, opening the pores and allowing the cleansing ingredients to penetrate. Then, use your hands to apply a small amount of water to the face and massage to create lather. As the product dissolves, it generates abundant foam, facilitating thorough cleansing. Finally, rinse thoroughly with plenty of water to complete the cleansing process. The skin feels very moisturized and comfortable after washing, without tightness, dryness, or a slippery residue.

[0021] When the cleansing product provided by this invention is applied to the facial skin, the skin pores are opened, making it easier for the cleansing surfactants to penetrate the pores, thereby achieving deep cleansing and blackhead removal. Once the pores are cleaned, it also helps the subsequent skin care products to be absorbed, thus achieving the best skin care effect. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the various embodiments of this invention will be described in detail below. However, those skilled in the art will understand that many technical details have been provided in the various embodiments of this invention to facilitate a better understanding of this application. However, the technical solutions claimed in this application can be implemented even without these technical details and various variations and modifications based on the following embodiments.

[0023] Waterless cleaning products

[0024] The waterless cleaning product provided according to an embodiment of the present invention comprises, by weight percentage:

[0025] a) Polyhydroxy polyether: 30%–80%;

[0026] b) Higher fatty alcohol fatty acid esters: 1%–10%;

[0027] c) Polymer thickener: 0.05%–10%;

[0028] d) Foaming surfactants: 1%–20%;

[0029] e) The remainder can be glycerol.

[0030] Polyhydroxy polyether

[0031] In embodiments of the present invention, the polyhydroxy polyether is selected from at least one of dihydroxy polyether, trihydroxy polyether, or hexahydroxy polyether.

[0032] In some preferred embodiments of the present invention, the polyhydroxy polyether is selected from at least one of glycerol polyether-7, glycerol polyether-12, glycerol polyether-26 or methyl glucetol polyether-20.

[0033] In a more preferred embodiment of the present invention, the polyhydroxy polyether is glycerol polyether-26.

[0034] In embodiments of the present invention, the polyhydroxy polyether has a mass percentage content of 40% to 50%. In some preferred embodiments of the present invention, the polyhydroxy polyether has a mass percentage content of 45%.

[0035] Higher fatty alcohol fatty acid esters

[0036] In embodiments of the present invention, the higher fatty alcohol fatty acid ester is formed by the condensation of higher fatty alcohols and higher fatty acids, and the melting point of the higher fatty alcohol fatty acid ester is in the range of 25 to 35°C.

[0037] The general formula of the higher fatty alcohol is R1-OH, wherein R1 is a saturated or unsaturated C12-C30 straight-chain hydrocarbon group, and wherein R1 is unsubstituted or substituted by one or more hydroxyl groups.

[0038] The general formula of the higher fatty acid is R2-COOH, wherein R2 is a saturated or unsaturated C12-C30 straight-chain hydrocarbon group, and wherein R2 is unsubstituted or substituted by one or more carboxyl groups.

[0039] The melting point of higher fatty alcohol fatty acid esters is related to the diameter of their smallest structural unit, i.e., the particle size; the smaller the particle size, the lower the melting point. Higher fatty alcohol fatty acid esters with melting points in the range of 25–35°C are available commercially.

[0040] In some preferred embodiments of the present invention, the higher fatty alcohol fatty acid ester is selected from at least one of myristyl myristate, cetyl ricinoleate, isostearyl myristate, stearyl lactate, stearyl heptanoate, stearyl octanoate, or cetyl octanoate.

[0041] In a more preferred embodiment of the present invention, the higher fatty alcohol fatty acid ester is a mixture of stearyl heptanoate and stearyl octanoate. Stearyl heptanoate (available from Evonik Industries, Germany) and stearyl octanoate (available from Shanghai Chuangsai Technology Co., Ltd.) both have melting points close to those of the skin. When the raw materials come into contact with the skin, they automatically dissolve, carrying away heat from the skin and achieving a cooling sensation. This can be combined with polyhydroxy polyethers to achieve a better synergistic heating effect.

[0042] In embodiments of the present invention, the mass percentage of the higher fatty alcohol fatty acid ester is 1% to 10%.

[0043] In some preferred embodiments of the present invention, the mass percentage of the higher fatty alcohol fatty acid ester is 3% to 5%.

[0044] Polymer thickener

[0045] When the waterless cleaning product with temperature sensitivity provided by this invention is a paste-like facial cleanser or a mud-like clay film, a thickener is required for thickening. In embodiments of this invention, the polymeric thickener is selected from at least one of starch-based thickeners, natural gum-based thickeners, or ion-resistant polymer thickeners.

[0046] In some embodiments of the present invention, the polymeric thickener is an ion-resistant polymer thickener, which is selected from at least one of dibutyllauroyl glutamine, dibutylethylhexanoyl glutamine, hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer, or polyacrylate crosslinked polymer-6.

[0047] In some preferred embodiments of the present invention, the polymeric thickener is a copolymer of hydroxyethyl acrylate and sodium acryloyl dimethyl taurate.

[0048] In embodiments of the present invention, the polymeric thickener has a mass percentage content of 0.05% to 10%.

[0049] In some preferred embodiments of the present invention, the polymeric thickener has a mass percentage content of 1% to 3%.

[0050] Foaming surfactants

[0051] The foamable surfactant component ensures that the waterless cleaning product of this invention achieves better deep cleaning and blackhead removal effects. In embodiments of this invention, the foamable surfactant is selected from at least one of amphoteric or amphoteric surfactants, anionic surfactants, nonionic surfactants, or mixtures thereof.

[0052] In some preferred embodiments of the present invention, the foamable surfactant is selected from anionic surfactants.

[0053] In a more preferred embodiment of the present invention, the foamable surfactant is a mixture of sodium cocoyl glycinate and sodium lauroyl glutamate.

[0054] In embodiments of the present invention, the foamable surfactant has a mass percentage content of 1% to 20%.

[0055] In some preferred embodiments of the present invention, the foamable surfactant has a mass percentage content of 4% to 15%.

[0056] In a more preferred embodiment of the present invention, the foamable surfactant has a mass percentage content of 6% to 10%.

[0057] polyols

[0058] In a more preferred embodiment of the present invention, a C2-C10 polyol is further included, wherein the C2-C10 polyol is selected from at least one of butylene glycol, propylene glycol, dipropylene glycol, or PEG-8. The combination of polyhydroxy polyether and C2-C10 polyol helps to enhance the skin's warming effect and the moisturizing feel after washing.

[0059] Other components

[0060] The cleansing product according to embodiments of the present invention is an anhydrous formulation and may further contain one or more of a humectant, colorant, stabilizer, exfoliant, filler, or adsorbent, for example, glycerin as a humectant or solvent; further, it may also include an adsorbent selected from at least one of kaolin, bentonite, or charcoal; the adsorbent has a mass percentage of 1% to 30%, more preferably 5% to 25%, and more preferably 10% to 20%. Without the adsorbent, the temperature-sensitive anhydrous cleansing product according to embodiments of the present invention is a transparent or opaque gel or cream / cream. When the aforementioned adsorbent is added to the formulation, it can be used as a mud-like cleansing mask. Furthermore, the raw materials added in the present invention are preferably dry powders or anhydrous liquids.

[0061] Usage and Effects

[0062] The waterless cleansing product according to embodiments of the present invention is suitable for use on dry hands and face. Specifically, first apply an appropriate amount of the cleansing product to the face. At this time, a warming sensation will be generated. The continuous and perceptible warmth will open the pores, making it easier for the cleansing ingredients to enter the pores for cleansing. Then, use your hands to apply a small amount of water to the face and massage to create foam. Finally, rinse thoroughly with plenty of water to complete the entire cleansing process. The skin feels very moisturized and comfortable after washing, without tightness, dryness, or a slippery feeling.

[0063] According to an embodiment of the present invention, the cleansing product contains polyhydroxy polyethers and higher fatty alcohol esters, which work synergistically to provide a gentle and lasting warming sensation that is easily perceived by the skin. The mechanism of action is as follows: the higher fatty alcohol esters used in this invention have melting points close to human skin temperature. When the cleansing product is applied to a dry face, the higher fatty alcohol esters melt and absorb heat immediately upon contact with the skin, lowering the skin temperature. At this time, the polyhydroxy polyether components slowly penetrate into the skin pores, interacting with the moisture in the pores through hydrogen bonds, generating heat. There is a time difference between the melting and heat absorption of the higher fatty alcohol ester components and the heat generation of the polyhydroxy polyether components. Thus, the skin experiences two processes: an initial temperature decrease and an increase in temperature due to external heat, resulting in a greater change in the skin surface temperature, with the warming sensation exceeding the cooling sensation, manifesting as a continuous and gentle warming feeling.

[0064] When the cleansing product according to the embodiments of the present invention is applied to the facial skin, the skin pores are opened, and the cleansing surfactant ingredients can more easily enter the pores, thereby achieving the purpose of deep cleansing and removing blackheads; once the pores are cleaned, it also helps the absorption of subsequent skin care products, thereby achieving the best skin care effect.

[0065] Specific embodiments and comparative examples

[0066] The advantages of this application are further illustrated below with reference to specific embodiments. It should be understood that these embodiments are for illustrative purposes only and are not intended to limit the scope of this application.

[0067] preparation

[0068] The facial cleansing products of Examples 1-10 and Comparative Examples 1-7 were prepared using the following method (all raw materials can be purchased from publicly available commercial channels):

[0069] (1) Thoroughly mix glycerin and polyhydroxy polyether as humectants and heat to 80°C;

[0070] (2) Add a high molecular weight thickener, stir homogenously until the whole system becomes thicker, then add higher fatty alcohol fatty acid esters, dissolve and cool down;

[0071] (3) When the temperature drops to 60°C, add surfactants and other raw materials, and then cool to room temperature.

[0072] The ingredients and their mass percentage ratios for the facial cleansing products in Examples 1-10 and Comparative Examples 1-7 are shown in Table 1.

[0073] Effect Measurement

[0074] The temperature-sensing effect of the facial cleansing products in Examples 1-10 and Comparative Examples 1-7 was measured using the following methods:

[0075] First, the temperature of the bare skin (i.e., the skin temperature before cleansing) was measured using a CK skin tester (a sensor that measures skin surface temperature by receiving infrared rays emitted from the skin surface; it is a non-contact instrument for measuring skin surface temperature and can be used to determine changes in microcirculation on the skin surface after applying cosmetics). This initial skin temperature was recorded. Then, 1g of the sample to be tested was evenly applied to the facial skin, and the skin temperature was measured again using the CK skin tester after 30 seconds. This temperature was recorded as the temperature after application. The temperature difference results for all embodiments are shown in the table below.

[0076] The results of the temperature sensitivity test of the facial cleansing products in Examples 1-10 and Comparative Examples 1-7 are shown in Table 2. The components in each example and comparative example are expressed as a percentage by mass. Furthermore, the conventional raw material components in each example and comparative example include: moisturizers, colorants, stabilizers, exfoliants, and fillers in the same proportions; these conventional raw material components do not affect the temperature sensitivity.

[0077] Table 1

[0078]

[0079] Table 2

[0080]

[0081] As shown in Tables 1 and 2, Examples 1-10 are cleansing products provided according to embodiments of the present invention. The polyhydroxy polyethers and higher fatty alcohol fatty acid esters in their components work synergistically to cause the skin to undergo two processes: an initial temperature decrease and an increase in temperature due to external heat. This increases the temperature difference on the skin surface, resulting in a greater sensation of heat than coolness, manifesting as a temperature sensation easily perceived by the skin. Therefore, after the cleansing products of Examples 1-10 are applied to the facial skin, the pores are opened, allowing the cleansing surfactants to more easily penetrate the pores, thereby achieving deep cleansing and blackhead removal. Once the pores are cleaned, it also helps in the absorption of subsequent skincare products, thus achieving the best skincare effect. In contrast, the cleansing products in Comparative Examples 1-7 did not follow the composition and proportioning of raw materials according to the technical solution provided by the present invention, and their skin temperature sensation efficacy is significantly inferior to that of Examples 1-10.

[0082] Those skilled in the art will understand that the above embodiments are specific examples of implementing the present invention, and in practical applications, various changes in form and detail may be made without departing from the spirit and scope of the present invention.

Claims

1. A waterless cleaning product with temperature sensitivity, characterized in that, In terms of mass percentage, it includes: Polyhydroxy polyether: 30%~80%; Higher fatty alcohol fatty acid esters: 1%~10%; Polymer thickener: 0.05%~10%; Foaming surfactant: 6%~10%; The melting point of the higher fatty alcohol fatty acid ester is in the range of 25~35℃; The polyhydroxy polyether is selected from at least one of glycerol polyether-7, glycerol polyether-12, glycerol polyether-26 or methyl glucetol polyether-20; The higher fatty alcohol fatty acid ester is selected from at least one of myristyl myristate, cetyl ricinoleate, isostearyl myristate, stearyl lactate, stearyl heptanoate, stearyl octanoate, or cetyl octanoate; The polymeric thickener is selected from at least one of butyllauroyl glutamine, butylethylhexanoyl glutamine, hydroxyethyl acrylate / sodium acryloyl dimethyl taurate copolymer or polyacrylate crosspolymer-6; The foaming surfactant is selected from one or a mixture of sodium cocoyl glycinate and sodium lauroyl glutamate.

2. The waterless cleaning product with temperature sensitivity according to claim 1, characterized in that, The mass percentage of the polyhydroxy polyether is 40% to 50%.

3. The waterless cleaning product with temperature sensitivity according to claim 1, characterized in that, The higher fatty alcohol fatty acid ester is a mixture of stearyl heptanoate and stearyl octanoate.

4. The waterless cleaning product with temperature sensitivity according to claim 1, characterized in that, The mass percentage of the higher fatty alcohol fatty acid ester is 3% to 5%.

5. The waterless cleaning product with temperature sensitivity according to claim 1, characterized in that, The polymeric thickener has a mass percentage content of 1% to 3%.

6. The waterless cleaning product with temperature sensitivity according to claim 1, characterized in that, It also includes C2-C10 polyols; the C2-C10 polyols are selected from at least one of butanediol, propylene glycol, and dipropylene glycol.

7. The waterless cleaning product with temperature sensitivity according to claim 1, characterized in that, It also contains one or more of the following: moisturizers, colorants, stabilizers, exfoliants, fillers, or absorbents.

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