Phase change cosmetic composition

Abstract

To provide a phase change cosmetic composition.SOLUTION: A cosmetic composition contains a wax having a melting point of 40 to 60°C and an inulin-based surfactant, so that the composition maintains a liquid state before applied to the skin and rubbed, and changes its phase to a solid state when applied to the skin and rubbed, and thus can solve problems in terms of hygiene and use because not scooped by hand in use, and can solve the problem of dripping when applied to face or skin.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a phase-change cosmetic composition, and more specifically, to a cosmetic composition which contains a wax having a melting point of 40 to 60°C and an inulin-based surfactant, and which maintains a liquid state before being applied to the skin and rubbed, but changes phase to a solid state when applied to the skin and rubbed thereafter. [Background technology]

[0002] Generally, liquid cosmetic compositions have the disadvantage that they drip easily when applied to the face or skin, making them inconvenient to use, while solid cosmetic compositions are used in the form of a balm, which must be scooped up with the hands to be applied to the face or skin. When a solid cosmetic composition is scooped up and applied with the hands, it is disadvantageous in that it causes contamination of the container, resulting in hygiene problems, and also causes the inconvenience of having to wash the hands again if the composition gets on the hands.

[0003] As a conventional technique for solving such problems, Korean Patent Publication No. 10-1787507 discloses a cosmetic composition that maintains a solid form at low temperatures and changes into a liquid form at the temperature of human skin after a certain period of time. However, even if the cosmetic composition changes into a liquid form at the temperature of human skin, it still has a drawback in that it drips from the face or skin. Furthermore, it is inconvenient to use in that it must be stored in a refrigerator before application.

[0004] This necessitates the development of cosmetic compositions that maintain a liquid form before application and rubbing onto the skin, and then undergo a phase change to a solid form upon application to the skin. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Republic of Korea Patent Registration No. 10-1787507 (Publication date: 2017.10.18) Summary of the Invention [Problem to be solved by the invention]

[0006] The present invention has been devised to solve the above problems, and an object of the present invention is to provide a cosmetic composition which maintains a liquid form before being applied to the skin and rubbed, thereby solving problems in hygiene and use since it is not necessary to scoop it up with the hands, and which changes phase to a solid form when rubbed after application to the skin, thereby solving the problem of dripping when applied to the face or skin. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object of the present invention, the present invention provides a cosmetic composition which contains a wax having a melting point of 40 to 60°C and an inulin-based surfactant, and which maintains a liquid state before being applied to the skin and rubbed, and changes phase to a solid state when applied to the skin and rubbed. Effect of the Invention

[0008] According to the present invention, a cosmetic composition can be obtained which maintains a liquid state before being applied to the skin and rubbed, and changes phase to a solid state when rubbed after application to the skin, thereby eliminating the need to scoop it up with the hands for use, thereby solving problems in hygiene and use, and also solving the problem of dripping when applied to the face or skin. [Brief description of the drawings]

[0009] [Figure 1] FIG. 1 is a diagram showing the properties of the cosmetic composition of the present invention immediately after application to the skin. [Diagram 2] FIG. 2 is a diagram showing the properties of the cosmetic composition of the present invention when it is applied to the skin and then rubbed. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] The present invention will now be described in detail with reference to the embodiments and drawings. The phase-change cosmetic composition of the present invention is characterized by maintaining a liquid form before being applied to the skin and rubbing, and changing into a solid form when applied to the skin and rubbed. The inventors of the present invention have conducted extensive research to solve the disadvantages of liquid cosmetic compositions, which are inconvenient to use because they drip easily when applied to the face or skin, and the disadvantages of solid cosmetic compositions, which cause hygienic problems due to container contamination when scooping the cosmetic composition with hands and cause the trouble of having to wash the hands again when the composition gets on the hands, and have found that when a wax having a melting point of 40 to 60°C and an inulin-based surfactant are contained as active ingredients, the cosmetic composition maintains a liquid form before being applied to the skin and changes into a solid form when rubbed after application to the skin, and have completed the present invention.

[0011] The term "liquid form" as used herein means that the composition is fluid at room temperature and has a viscosity in the range of 150 to 250 mPa·s, more preferably 180 to 230 mPa·s, and most preferably 200 mPa·s. If the viscosity is below the lower limit, the composition may drip immediately after application to the skin, and if the viscosity is above the upper limit, the fluidity may decrease, making it difficult to apply from a container to the skin.

[0012] The cosmetic composition of the present invention maintains a liquid form before being applied to the skin and rubbed as described above, which is hygienic as it eliminates the need to scoop the cosmetic composition with hands. In addition, the fact that the cosmetic composition of the present invention maintains a liquid form before being applied to the skin and rubbed as described above naturally means that the cosmetic composition exhibits fluidity and maintains a liquid form at room temperature even when stored in a container before being applied to the skin, so it does not necessarily have to be used in a balm-type form and has the advantage that it can be stored in various types of containers. Specifically, it can be stored in various containers such as bottle-type, tube-type, pot-type, rollerball-type, pen-type, stick-type, lidded / stoppered type, and pump / dispenser-type.

[0013] The term "solid form" as used herein means that the composition does not exhibit fluidity at room temperature and has a constant form, and when the hardness is measured using a hardness tester (Sun Rheo Meter, Compac CR-100D, manufactured by Sun Scientific, mode No. 20, spindle 1.5 cm, speed 1 cm / min, penetration distance 20 mm), the hardness is 60 to 100 gf / cm 2 This means that the range is 70~80gf / cm 2 More preferably, it is 75 gf / cm 2 It is most desirable that:

[0014] In the present specification, the wax having a melting point of 40 to 60°C is an active ingredient that provides a phase change effect together with the inulin-based surfactant, and may be used in combination with a low melting wax having a melting point of 50°C or less and a high melting wax having a melting point of 70°C or more, and it is more preferable to use a wax ester.

[0015] Examples of the low melting point wax include hydrogenated olive oil lauryl esters, rice bran wax, and Astrocayum Murumuru seed butter, and examples of the high melting point wax include sunflower seed wax, bees wax, candelilla wax, carnauba wax, jojoba seed wax, jasmine flower wax, ozokerite, and synthetic wax.

[0016] Examples of the wax ester include C16 to C40 alkyl stearate, C20 to C40 alkyl stearate, C20 to C40 dialkyl ester of dimer acid, C18 to C38 alkyl hydroxystearoyl stearate, C20 to C40 alkyl erucate, C30 to C50 alkyl beeswax, tristearyl citrate, triisostearyl citrate, stearyl heptanoate, stearyl octanoate, trilauryl citrate, ethylene glycol dipalmitate, ethylene glycol distearate, di(12-hydroxystearic acid) of ethylene glycol, stearyl stearate, palmityl stearate, stearyl behenate, cetyl ester, cetearyl behenate, and behenyl behenate.

[0017] The wax component can improve the stability of the cosmetic composition within the melting point range of 40 to 60° C., and can provide the phase change effect that is the objective of the present invention. It is most preferable to use cetyl ester as the wax that exhibits the above effect within the above melting point range.

[0018] In the present specification, the inulin-based surfactant is preferably at least one selected from the group consisting of inulin, stearoyl inulin, lauryl carbamate inulin, and palmitoyl inulin, as an active ingredient that provides a phase change effect together with the wax having a melting point of 40 to 60° C. In the above melting point range, it is most preferable to use lauryl carbamate inulin as an inulin-based surfactant that exhibits the above effect, which can prevent the so-called Ostwald ripening phenomenon in which relatively small particles continue to get smaller and larger particles get larger, eventually causing the small particles to disappear.

[0019] In this case, the content of the wax is preferably 15-20 wt%, more preferably 17-19 wt%, and most preferably 18 wt%, based on the total weight of the composition. The content of the inulin-based surfactant is preferably 0.125-0.5 wt%, more preferably 0.3-0.5 wt%, and most preferably 0.5 wt%, based on the total weight of the composition. Within the above content range, the phase change effect targeted by the present invention can be particularly provided.

[0020] The cosmetic composition according to an embodiment of the present invention is preferably an oil-in-water type formulation in which the internal phase is an oil phase and the external phase is an aqueous phase. In the cosmetic composition according to an embodiment of the present invention, the wax is preferably contained in the oil phase and the inulin-based surfactant is preferably contained in the aqueous phase. In this case, the content of the oil phase is preferably 16.5 to 49.5 wt% based on the total weight of the composition. Specifically, it is preferably not less than 16.5 wt%, more than 16.5 wt%, but not more than 49.5 wt%, and less than 49.5 wt%. More specifically, it is more preferably 20 to 45 wt%, even more preferably 25 to 40 wt%, and most preferably 30 to 35 wt%.

[0021] The content ratio of the oil phase to the aqueous phase is preferably 1:1 to 3, more preferably 1:1.5 to 2.5, and most preferably 1:2 to 2.3, based on weight. Within the above content range and content ratio range, the phase change effect targeted by the present invention can be particularly obtained.

[0022] The oil phase contains an oil component, and various oils known in the art may be used as the oil component. Specifically, hydrocarbon oils such as hexadecane and paraffin, ester-based synthetic oils such as isopropyl myristate, silicone oils such as demethicone and cyclomethicone, animal and vegetable oils such as corn oil, soybean oil, avocado oil, sesame oil, jojoba oil, sunflower oil, nut oil, squalene and fish oil, ethoxylated alkyl ether oils, propoxylated alkyl ether oils, and the like may be used.

[0023] The oil phase may further contain a lipid component, and the lipid component may be ceramide, cholesterol, stearic acid, etc. The ceramide may be a natural ceramide or a synthetic ceramide, and the synthetic ceramide includes a pseudoceramide. It is most preferable to use hydroxypropyl bispalmitamide MEA, which is a type of pseudoceramide, as the lipid component exhibiting the above effect.

[0024] According to a preferred embodiment of the present invention, the phase change cosmetic composition of the present invention is produced by a high-pressure emulsification method. Specifically, the method includes the steps of producing an oil phase containing a wax having a melting point of 40 to 60°C, producing an aqueous phase containing an inulin-based surfactant, adding the oil phase to the aqueous phase so that the content ratio of the oil phase to the aqueous phase is 1:1 to 3 by weight, and then mixing the mixture obtained by the mixing, and subjecting the mixture to a high-pressure emulsification treatment at a pressure of 500 to 1,500 bar.

[0025] In addition to the above ingredients, the cosmetic composition may further contain moisturizers, anti-inflammatory agents, antibacterial agents, antifungal agents, UV blocking agents, UV absorbing agents, or antibiotics depending on the purpose. The moisturizers include glycerin, 1,3-butylene glycol, dipropylene glycol, propylene glycol, sorbitol, or extracts from natural products that are commonly used in cosmetics. In addition, the cosmetic composition may contain common auxiliary agents such as stabilizers, solvents, vitamins, dyes, pigments, and fragrances that are commonly used in the field of cosmetic compositions. EXAMPLES

[0026] The present invention will be described in detail below with reference to examples. However, the following examples are merely illustrative to aid in a general understanding of the present invention, and the content of the present invention is not limited to the following examples.

[0027] <Production Example 1> Production of composition Compositions of Example 1, Comparative Example 1 (formulation in which the wax content is below the preferred range), Comparative Example 2 (formulation in which the wax content exceeds the preferred range), Comparative Example 3 (formulation in which the oil phase content is below the preferred range), Comparative Example 4 (formulation in which the oil phase content exceeds the preferred range), Comparative Example 5 (formulation containing carnauba wax instead of cetyl ester as the wax), Comparative Example 6 (formulation containing PPG-13-decyltetradeceth-24 instead of lauryl carbamate inulin as the surfactant), Comparative Example 7 (formulation in which the lauryl carbamate inulin content is below the preferred range), and Comparative Example 8 (formulation in which the lauryl carbamate inulin content exceeds the preferred range) were prepared with the compositions and contents in Table 1 below (unit: weight %).

[0028] [Table 1]

[0029] The method for producing the composition is as follows. Raw materials No. 1 to No. 4 in Table 1 were mixed and heated to 70°C to produce an oil phase, and raw materials No. 5 to No. 8 in Table 1 were mixed and heated to 70°C to produce an aqueous phase. The oil phase was gradually added to the aqueous phase while stirring to homogenize and form a primary emulsion, and the primary emulsion was passed through a high-pressure homogenizer at a pressure of 1,000 bar three times to produce the compositions of Example 1 and Comparative Examples 1 to 8.

[0030] <Experimental Example 1> Evaluation of composition properties First, in the case of Comparative Example 2, which is a formulation in which the wax content exceeds the preferred range, the stability is so poor that particles are visible from the beginning, and it was found that a stable composition cannot be produced by the above-mentioned manufacturing method.In the case of Comparative Example 5, which is a formulation containing carnauba wax, not cetyl ester, as the wax, it is produced in a solid state from the beginning, and it was found that a stable liquid composition cannot be produced.

[0031] In the case of Comparative Example 3, in which the content of the oil phase was less than the preferred range, the product was prepared in the form of a skin lotion rather than a milky lotion, and when applied to the skin and rubbed, there was no tendency for the product to precipitate as a solid, which is a characteristic of the present invention.

[0032] In the case of Comparative Example 4, in which the content of the oil phase exceeded the preferred range, the product was prepared in a sticky form with a high viscosity rather than in the form of a soft emulsion, and tended to precipitate in a solid form before being applied to the skin.

[0033] In the case of Comparative Example 6, which is a formulation containing PPG-13-decyltetradeceth-24 instead of lauryl carbamate inulin as the surfactant, the characteristic phase inversion feeling was inferior and the stability also tended to decrease.

[0034] In the case of Comparative Example 7, in which the content of inulin lauryl carbamate was below the preferred range, the stability tended to decrease, and in the case of Comparative Example 8, in which the content of inulin lauryl carbamate was above the preferred range, the specific phase inversion sensation tended to be inferior.

[0035] In contrast, in the case of Example 1, after preparation, the product was prepared in a milky liquid form as shown in FIG. 1 before being applied to the skin and rubbed, but when applied to the skin and rubbed, it tended to precipitate in a solid form as shown in FIG. 2.

[0036] <Experimental Example 2> Evaluation of immediate phase inversion sensation of the composition The immediate phase inversion sensation of the prepared compositions was expressed as the average value (on a 5-point scale) of the evaluation values ​​obtained by carrying out a sensation test by a professional panel.

[0037] <Evaluation criteria on a 5-point scale> 5 points: Strongly agree, 4 points: Agree, 3 points: Neither agree nor disagree, 2 points: Not really agree, 1 point: Strongly disagree

[0038] [Table 2]

[0039] From the results in Table 2, it can be seen that Example 1 has an excellent immediate phase change sensation, and in particular, Comparative Example 1, which is a formulation in which the wax content is below the preferred range, has a poor phase change sensation, and Comparative Example 4, which is a formulation in which the oil phase content exceeds the preferred range, has a poor phase change sensation, with an excessive filmy sensation felt when rubbed after application to the skin. In addition, Comparative Examples 3 and 6 to 8 showed a significantly poor phase change sensation.

[0040] Although the present invention has been described with reference to the preferred embodiment, various modifications and variations can be made without departing from the spirit and scope of the invention, and therefore, the appended claims are intended to cover such modifications and variations as fall within the spirit and scope of the invention.

Claims

1. It contains a wax having a melting point of 40 to 60°C and an inulin-based surfactant, A phase-change cosmetic composition that maintains a liquid state before being applied to the skin and rubbed, and changes phase to a solid state when applied to the skin and rubbed, The content of the wax is 15 to 20 wt % and the content of the inulin-based surfactant is 0.125 to 0.5 wt % based on the total weight of the cosmetic composition; The wax is a mixture of a low-melting wax having a melting point of 50° C. or less and a high-melting wax having a melting point of 70° C. or more, or a wax ester; The inulin-based surfactant is at least one selected from the group consisting of inulin, stearoyl inulin, lauryl carbamate inulin, and palmitoyl inulin; The cosmetic composition has an oil-in-water formulation in which the internal phase is an oil phase and the external phase is an aqueous phase, and the wax is contained in the oil phase and the inulin-based surfactant is contained in the aqueous phase, forming a phase-change cosmetic composition.

2. The composition maintains a liquid state with a viscosity of 150 to 250 mPa·s before being applied to the skin and rubbed, and has a hardness of 60 to 100 gf / cm after being applied to the skin and rubbed. ２ 2. The phase change cosmetic composition of claim 1, which undergoes a phase change to a solid state where

3. 10. The phase change cosmetic composition of claim 1, wherein said wax is a cetyl ester.

4. The phase change cosmetic composition of claim 1 , wherein the inulin-based surfactant is inulin lauryl carbamate.

5. 2. The phase-change cosmetic composition according to claim 1, wherein the wax content is 17-19 wt % and the inulin-based surfactant content is 0.3-0.5 wt %, based on the total weight of the composition.

6. The phase-change cosmetic composition according to claim 1 , wherein the content of the oil phase portion is more than 16.5% by weight and less than 49.5% by weight, based on the total weight of the composition.

7. The phase-change cosmetic composition according to claim 1, wherein the content ratio of the oil phase and the aqueous phase is 1:1 to 3 by weight.

8. Producing an oil phase containing a wax having a melting point of 40 to 60°C; Producing an aqueous phase containing an inulin-based surfactant; adding the oil phase to the aqueous phase so that the content ratio of the oil phase to the aqueous phase is 1:1 to 3 by weight; and subjecting the mixture obtained by the mixing to a high-pressure emulsification treatment at a pressure of 500 to 1,500 bar. The method for producing the phase-change cosmetic composition according to any one of claims 1 to 7, which maintains a liquid form before being applied to the skin and rubbed, and changes phase to a solid form when rubbed after application to the skin.

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