A method for producing dextrin fatty acid esters, a transparent oil gel containing dextrin fatty acid esters produced by the said method, and a transparent solid cosmetic.

Abstract

To provide a method for producing dextrin fatty acid esters, and a transparent oil gel and a transparent solid cosmetic containing dextrin fatty acid esters produced by the said method. [Solution] Dextrin can be dispersed in an organic mixed solvent containing a hexane-based solvent, then a fatty acid halide is added and reacted, and after the reaction is complete, water is added to induce layer separation and separate the upper layer liquid, and crystals can be precipitated from the upper layer liquid to provide a dextrin fatty acid ester. In particular, by providing a transparent dextrin palmitate that has strong gel strength, it is possible to provide a transparent oil gel composed of the dextrin palmitate and oil, and a variety of transparent solid cosmetics using the same.

Description

Technical Field

[0001] The present invention relates to a method for producing a dextrin fatty acid ester, a transparent oil gel containing the dextrin fatty acid ester produced by the production method, and a transparent solid cosmetic. More specifically, after adding dextrin to an organic mixed solvent containing a hexane-based solvent and dispersing it, a fatty acid halide is added and reacted. After the reaction is completed, water is added to induce layer separation, and the upper layer liquid is separated. Crystals are precipitated from the upper layer liquid to provide a dextrin fatty acid ester, particularly a transparent dextrin palmitate having a hard gel strength. The present invention also relates to a transparent oil gel containing the dextrin palmitate and oil, and a transparent solid cosmetic using the same.

Background Art

[0002] Oily oils are materials for transparent cosmetics, and have advantages such as beautiful appearance and a transparent finish when applied. In particular, dextrin fatty acid esters have been used as cosmetic raw materials for forming typical transparent oil gels.

[0003] For example, Patent Document 1 discloses a transparent cosmetic realized by blending a dextrin fatty acid ester, heavy liquid isoparaffin, and a liquid oil from the viewpoint of improving the gloss during application. At this time, it is characterized by using dextrin palmitate as the dextrin fatty acid ester.

[0004] Transparent cosmetics containing 12-hydroxystearic acid or a dextrin fatty acid ester are widely known. However, in Patent Document 2, these transparent cosmetics exhibit poor continuity and a discontinuous property during application, and the finish after application is also insufficient. There is a problem that the transparency decreases over time. Furthermore, transparent cosmetics containing a dextrin fatty acid ester have insufficient formability as a stick-like preparation. When a solidifying agent such as wax is additionally blended to compensate for this, it has been pointed out that the transparency decreases instead.

[0005] To address these problems, Patent Document 2 discloses a gel composition containing a dextrin fatty acid ester in a transparent cosmetic containing 12-hydroxystearyl acid and oil. The dextrin fatty acid ester is characterized by using one or more selected from the group consisting of dextrin palmitate, dextrin 2-ethylhexanoate ester, and dextrin myristate / palmitate.

[0006] Patent Document 3 discloses oil-based solid cosmetics such as foundation, base foundation, lipstick, eyeshadow, and lip balm. Such solid cosmetics are required to have excellent transparency, no stickiness when applied, a refreshing feel after application, good spreadability, and storage stability.

[0007] To meet these requirements, Patent Document 3 discloses a transparent solid cosmetic composition containing dextrin fatty acid ester (dextrin palmitate), a liquid oil with a hydroxyl value of 20 or less, amorphous fine particle anhydrous silicic acid with a particle size of 0.001 to 0.05 μm, and spherical anhydrous silicic acid with a particle size of 0.1 to 30 μm.

[0008] Patent Document 4 discloses a cleansing cosmetic composition containing a dextrin fatty acid ester, a surfactant, and an oily component. The inclusion of the dextrin fatty acid ester maintains a non-flowing, transparent gel phase, eliminating the risk of it running off. When applied to the skin, its structure gradually melts due to body temperature and friction, providing a similar feel to conventional cleansing oils. Therefore, a transparent or translucent cleansing cosmetic composition is provided that does not run off when applied to the skin and is easy to use.

[0009] Another approach to providing transparent solid cosmetics is proposed in Patent Document 5, which uses amino acid-based gelling agents dibutyl lauroyl glutamide (GP-1) and dibutyl hexanoyl glutamide (EB-21) to form an oil gel by heating the oil to 120-140°C during the gel formation process. However, when using gelling agents as described above, the high temperature required to form the gel leads to oxidation or decomposition of the cosmetic composition components, making it difficult to produce the desired cosmetic.

[0010] Furthermore, Patent Document 6 discloses a cleansing composition for makeup removal that relates to an oil-based cleansing agent composition with low frictional force, wherein the cleansing agent composition contains an ester-based oil and a dextrin-based oil thickener as active ingredients, and the dextrin-based oil thickener is dextrin palmitate / ethyl hexanoate, and its content is 0.5 to 3.0% by weight of the total weight of the composition.

[0011] Therefore, while dextrin palmitate / ethylhexanoate and dextrin myristate, among dextrin fatty acid esters, form a somewhat transparent oil gel, they have problems when used alone as oil gelling agents in multiple oils such as mineral oil, and are therefore used in mixture with dextrin palmitate.

[0012] Traditionally, dextrin fatty acid esters have been used to manufacture transparent cosmetics, and dextrin palmitate in particular is commercially available. However, while the gel strength can be maintained at around 200g with mineral oil, it has the drawback of significantly reduced transparency.

[0013] Therefore, after conducting extensive research to solve the problems of the conventional method, the inventors have found that if a transparent gel can be obtained by mixing dextrin palmitate with oil, then a transparent oil gel can be formed even when dextrin palmitate alone is mixed with oil, and strong gel strength can be achieved. This led to the completion of the present invention. [Prior art documents] [Patent Documents]

[0014] [Patent Document 1] Japanese Published Patent No. 1997-235210 (Published September 9, 1997, Title: Solid Cosmetic Composition) [Patent Document 2] Japanese Published Patent No. 2001-39817 (Published February 13, 2001, Title: Transparent Cosmetic) [Patent Document 3] Japanese Published Patent No. 1999-255616 (Published September 21, 1999, Name: Solid Cosmetic Composition) [Patent Document 4] Korean Published Patent No. 2015-0014279 (Published February 6, 2015, Title: Transparent or translucent gel-like cleansing cosmetic composition) [Patent Document 5] Korean Patent No. 2610444 (Published December 1, 2023, Title: Cosmetic Composition) [Patent Document 6] Korean Patent No. 1877252 (Published July 11, 2018, Title: Low-Friction Oil Cleaning Agent Composition) [Overview of the project] [Problems that the invention aims to solve]

[0015] The object of the present invention is to provide a method for producing dextrin fatty acid esters.

[0016] Another object of the present invention is to provide a transparent oil gel comprising a dextrin fatty acid ester produced by the above-described manufacturing method and an oil.

[0017] Another object of the present invention is to provide a transparent solid cosmetic material containing the transparent oil gel as a base material. [Means for solving the problem]

[0018] To achieve the above objective, the present invention provides a method for producing dextrin fatty acid esters, comprising: a first step of adding and dispersing dextrin in an organic mixed solvent containing a hexane-based solvent, and then adding a fatty acid halide while maintaining the temperature at 0 to 120°C to cause a reaction; a second step of adding water after the reaction is completed to induce phase separation and separate the upper layer liquid; and a third step of precipitating crystals from the upper layer liquid and drying, wherein the organic mixed solvent has different polarities, and in the second step, the hexane-based solvent remains in the upper layer liquid due to phase separation by water, thereby separating the dextrin fatty acid esters.

[0019] The organic mixed solvent comprises a first solvent selected from the group consisting of n-hexane, cyclohexane, and methylcyclohexane, and a second solvent selected from the group consisting of dimethylformamide, dimethylacetamide, dimethyl sulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP). Preferably, in embodiments of the present invention, the organic mixed solvent comprises methylcyclohexane and dimethylformamide.

[0020] In the first step, it is preferable to use dextrin having an average saccharide polymerization degree of 35 to 80.

[0021] Furthermore, in the dextrin fatty acid ester of the present invention, the fatty acid is a higher fatty acid having 12 to 22 carbon atoms, and preferably, in the embodiment of the present invention, dextrin palmitate is produced. In this case, the dextrin palmitate has an average degree of acylation substitution of 1.3 to 2.5.

[0022] The present invention provides a transparent oil gel comprising 2 to 20% by weight of a dextrin fatty acid ester produced by the method for producing the dextrin fatty acid ester and 80 to 98% by weight of an oil.

[0023] Preferably, the dextrin fatty acid ester is dextrin palmitate, and in this case, a transparent oil gel having a transmittance of 10% or more at a wavelength of 375 nm when blended with an oil is provided.

[0024] Furthermore, a transparent solid cosmetic containing a solid composition using the transparent oil gel as a base material is provided.

Effects of the Invention

[0025] The method for producing a dextrin fatty acid ester of the present invention involves introducing dextrin into an organic mixed solvent containing a hexane-based solvent and dispersing it, then adding a fatty acid halide and reacting, adding water after completion of the reaction to induce layer separation and separating the upper layer liquid, and precipitating crystals from the upper layer liquid to provide a dextrin fatty acid ester. By this method, a transparent dextrin fatty acid ester having a strong gel strength can be provided by an economical method based on the solvent fractionation method.

[0026] Therefore, by the method for producing a dextrin fatty acid ester of the present invention, a transparent oil gel can be provided by blending transparent dextrin palmitate having a strong gel strength alone with an oil, and furthermore, various transparent solid cosmetics can be provided using this.

Brief Description of the Drawings

[0027] [Figure 1] It is a diagram showing the comparison results of the transmittance by wavelength between dextrin palmitate produced by the production method of the present invention and a commercially available product. [Figure 2] It is an appearance photograph of dextrin palmitate produced by the production method of the present invention and a commercially available product. [Figure 3]This figure shows a comparison of the transparency at different wavelengths of dextrin palmitate produced by the manufacturing method of the present invention and a commercially available product applied to cleansing oil. [Modes for carrying out the invention]

[0028] The present invention will be described in detail below.

[0029] The present invention provides a method for producing dextrin fatty acid esters, comprising: a first step of adding and dispersing dextrin in an organic mixed solvent containing a hexane-based solvent, and then adding a fatty acid halide while maintaining the temperature at 0 to 120°C to allow the reaction to proceed; a second step of adding water after the reaction is complete to induce phase separation and separate the upper layer liquid; and a third step of precipitating crystals from the upper layer liquid and drying, wherein the organic mixed solvent has different polarities, and in the second step, the hexane-based solvent remains in the upper layer liquid due to phase separation by water, thereby separating the dextrin fatty acid esters.

[0030] The present invention provides a method for producing dextrin fatty acid esters using organic mixed solvents with different polarities. More specifically, the organic mixed solvent consists of a first solvent, which is a nonpolar hexane-based solvent, and a second solvent, which is a polar solvent. When the two solvents are mixed, the first solvent, which has a lower density, is located in the upper layer of liquid, and the second solvent, which has a higher density, is located in the lower layer of liquid, resulting in a solvent fractionation method that induces phase separation. In particular, when water is added to induce phase separation, the lower layer of liquid is washed away and removed along with the water, and the hexane-based solvent remains in the upper layer of liquid, thereby allowing for the separation and purification of dextrin fatty acid esters.

[0031] The first solvent, which is a hexane-based solvent, is selected from the group consisting of n-hexane, cyclohexane, and methylcyclohexane. In the embodiments of the present invention, methylcyclohexane is described as a preferred example, but the invention is not limited thereto.

[0032] Furthermore, as an example of a polar solvent, any of the following can be used: dimethylformamide, dimethylacetamide, dimethyl sulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP). In the embodiments of the present invention, an organic mixed solvent consisting of methylcyclohexane and dimethylformamide is described as the most preferred example, but the invention is not limited thereto.

[0033] The present invention provides a manufacturing method that produces a dextrin fatty acid ester represented by the following chemical formula 1, which is synthesized by reacting dextrin with a fatty acid halide.

[0034] [ka]

[0035] In the above formula, A represents a fatty acid, and n represents the degree of polymerization of dextrin.

[0036] In the first step, the dextrin preferably has an average saccharide polymerization degree of 35 to 80. In this case, if the polymerization degree of the dextrin is less than 35, it is transparent, but the oil separates when forming the gel with the oil. If the polymerization degree exceeds 80, it is transparent, but hardens when forming the gel with the oil, causing the gel to shrink and making it difficult to form a gel suitable for cosmetics.

[0037] The aforementioned fatty acid is a higher fatty acid having 12 to 22 carbon atoms, preferably selected from the group consisting of lauric acid (C12), myristic acid (C14), palmitic acid (C16), stearic acid (C18), arachidic acid (C20), behenic acid (C22), and coconut oil fatty acid (containing 64% medium-chain fatty acids of C8 to C12). Preferably, in embodiments of the present invention, palmitic acid will be described as an example, but the invention is not limited thereto.

[0038] More preferably, dextrin palmitate is produced by the manufacturing method of the present invention, and the gel strength varies depending on the acyl groups on the dextrin fatty acid ester, with longer linear fatty acid groups and saccharide chains producing an even stronger oil gel.

[0039] The dextrin palmitate of the present invention has an average degree of acylation substitution of 1.3 to 2.5. When the degree of substitution is less than 1.3, it is difficult to form an oil gel and solubility tends to decrease, while when the degree of substitution exceeds 2.5, it dissolves well in oil and forms a gel, but has the disadvantage of reduced gel strength.

[0040] Therefore, the dextrin palmitate produced by the manufacturing method of the present invention satisfies the gel strength requirements depending on the concentration used and the type of oil, and provides excellent stability in oils, along with the gelation properties of various hydrocarbons and esters.

[0041] In the manufacturing method of the present invention, the organic mixed solvent in the first step can further contain a catalyst, and as an example, picoline-based catalysts such as pyridine and 3-methylpyridine can be used alone or in combination.

[0042] After dispersing dextrin in the aforementioned organic mixed solvent, fatty acid halides are added dropwise at 10-minute intervals over 15 hours while maintaining the temperature at 0°C to 120°C, and the reaction is carried out for 1 to 24 hours.

[0043] Subsequently, after the reaction in the first step is complete, in the second step, water is added and the mixture is stirred for 10 minutes to 6 hours, followed by layer separation. In the third step, a solvent is added to the separated upper layer (oil layer), and the precipitated crystals are filtered to produce the target product, dextrin fatty acid ester. At this time, acetone, methanol, etc., are used as the solvent.

[0044] At this stage, the polar second solvent is washed away with water into the lower layer (aqueous solution layer) separated by water, while the hexane-based solvent remains in the upper layer (oil layer), separating the dextrin fatty acid ester.

[0045] Figure 1 shows a comparison of wavelength-specific transmittances between dextrin palmitate produced by the manufacturing method of the present invention and commercially available dextrin palmitate (KL2 manufactured by Chiba Flour Milling Co., Ltd.), confirming that the dextrin palmitate of the present invention has remarkably high transparency.

[0046] Specifically, the dextrin palmitate of the present invention showed a transmittance of 23.8% at a wavelength of 375 nm (1 cm cell), while commercially available products showed 4.8% under the same wavelength conditions. This approximately 5.0 times higher transmittance confirms that the gel is 5 times more transparent.

[0047] Figure 2 is a photograph of the dextrin palmitate shown in Figure 1, allowing for a visual (with the naked eye) comparison of the transparency of a commercially available product (KL2 manufactured by Chiba Flour Milling Co., Ltd.) dextrin palmitate with the transparency of the dextrin palmitate of Example 1. Therefore, in a mineral oil gel using 10% of the dextrin palmitate of the present invention, the gel strength is maintained at approximately 200g while the transparency is more than five times higher than that of the comparative example (Leopal KL2 manufactured by Chiba Flour Milling Co., Ltd.).

[0048] Based on the above, the method for producing dextrin fatty acid esters of the present invention makes it possible to provide a transparent dextrin fatty acid ester, preferably dextrin palmitate, while maintaining strong gel strength.

[0049] Therefore, the present invention provides a transparent oil gel containing 2-20% by weight of dextrin fatty acid ester and 80-98% by weight of oil, produced by the above manufacturing method.

[0050] Specifically, the dextrin fatty acid ester is dextrin palmitate, and in this case, when blended with oil, it has a transmittance of 10% or more at a wavelength of 375 nm, and preferably, in the embodiment, a gel blended with 10% (w / w) mineral oil has a transmittance of 23.8%.

[0051] Based on embodiments of the present invention, the transparent oil gel is produced by mixing 10% by weight of dextrin palmitate with 90% by weight of mineral oil (Lilly 70), raising the temperature to 90°C to dissolve the mixture, and then allowing it to stand for 24 hours. At this time, a stable oil gel can be easily obtained by dissolving the dextrin palmitate at a high temperature and can be produced by cooling without stirring. After the 24 hours of standing, the gel strength and transparency are measured.

[0052] In addition to the aforementioned oils, remarkably high transparency was also observed with ethylhexyl palmitate and sunflower oil, a natural oil.

[0053] The oils used in this invention are not particularly limited, but include triethylhexanoin, hexyl laurate, diethylhexyl succinate, isotridecyl isononanoate, neopentyl glycol diethylhexanoate, isobutyl isostearate, cetyl ethylhexanoate, ethylhexyl palmitate, isostearyl neopentanoate, neopentyl glycol dicaprate, neopentyl glycol diisononanoate, caprylic / capric triglyceride, triethylhexanoin, tricyclodecanemethyl isononanoate, trimethylolpropane triethylhexanoate, octyldodecanol, and hydroxystearin. Ethylhexyl acid, isostearic acid, octyldodecyl stearoyloxystearate, diisopropyl dilinolenate, triisostearin, trimethylolpropane triisostearate, pentaerythritol tetraisostearate, polyglyceryl-2 triisostearate, polyglyceryl-2 diisostearate, dipentaerythrityl hexasiononanoate, diisostearyl marate, diisobutyl adipate, hexyldecyl ethylhexanoate, ethylhexyl isononanoate, isodecyl isononanoate, isotridecyl isononanoate, isopropyl myristate, isopropyl palmitate, ethylhexyl palmitate,Dipentaerythrityl (hydroxystearate / isostearate / rosin acid, hydrogenated castor oil isostearate, hydrogenated castor oil dimer linoleate, (polyglyceryl-2 isostearate / dimer linoleate) copolymer, (polyglyceryl-2 diisostearate / dimer linoleate) copolymer, dimer linoleate (phytosteryl / isostearyl / cetyl / stearyl / behenyl), dimer linoleyl bis(phytosteryl / behenyl / isostearyl), dimer linoleate Di(isostearyl / phytosteryl) dimer linoleate, hydrogenated rosin dimer dilinoleyl condensate, dimer dilinoleyl diisostearate, dimer dilinoleyl dimer dilinoleate, di(cholesteryl / behenyl / octyldodecyl) lauroyl glutamate, di(octyldodecyl / phytosteryl / behenyl) lauroyl glutamate, myristoyl methylalanine (phytosteryl / decyltetradecyl), (diglycerin / dimer linoleic acid / hydroxystearic acid) copolymer, etc. can be used.

[0054] Furthermore, the present invention provides a transparent solid cosmetic containing the transparent oil gel as a base material.

[0055] The transparent solid cosmetic composition using the aforementioned dextrin palmitate can be applied to transparent cosmetic compositions in various dosage forms, such as transparent lipstick, transparent lip gloss, transparent lip balm, transparent eyeshadow, transparent hair stick, transparent gel perfume, and transparent makeup stick.

[0056] Figure 3 shows a comparison of the transparency at different wavelengths of dextrin palmitate produced by the manufacturing method of the present invention and a cleansing oil in which a commercially available product was applied. It can be confirmed that the cleansing oil containing dextrin palmitate produced by the manufacturing method of the present invention has 2.8 times the transparency at a wavelength of 375 nm (1 cm cell) compared to the commercially available product.

[0057] The present invention will be described in more detail below based on examples.

[0058] These embodiments are provided to illustrate the present invention in more detail, and the scope of the present invention is not limited to these embodiments.

[0059] <Example 1> Production of dextrin palmitate 1 To a mixed solvent of 390 g of pyridine, 550 g of dimethylformamide, and 500 g of methylcyclohexane, 165 g of dextrin with an average saccharide degree of polymerization of 40 was added, and then 570 g of palmitoyl chloride was added dropwise over 30 minutes. After the dropwise addition was complete, the reaction solution was heated to a reaction temperature of 90°C and stirred for 10 hours to complete the reaction. 1000 ml of purified water was added to the reaction solution and stirred for 30 minutes to separate the layers. The lower layer was separated and discarded, and 50 g of MgSO4 was added to the upper layer and stirred. After stirring, the water was removed by filtration. Acetone was added to the separated upper layer solution to precipitate crystals. The precipitated crystals were filtered. This was washed with acetone and dried to obtain 600 g of white powder. At this time, the obtained dextrin palmitate had a gel strength of 232 g in 10% (w / w) mineral oil.

[0060] <Example 2> Production of dextrin palmitate 2 The procedure was the same as in Example 1, except that dextrin with an average saccharide polymerization degree of 60 was used.

[0061] <Example 3> Production of dextrin palmitate 3 The procedure was the same as in Example 1, except that dimethyl sulfoxide was used instead of dimethylformamide.

[0062] <Comparative Example 1> Production of dextrin palmitate To a mixed solvent of 390 g of pyridine and 550 g of dimethylformamide, 165 g of dextrin with an average saccharide degree of polymerization of 40 was added, and then 570 g of palmitoyl chloride was added dropwise over 30 minutes. After the dropwise addition was complete, the reaction solution was heated to a reaction temperature of 90°C and stirred for 10 hours to complete the reaction. The reaction solution was filtered, and methanol was added to precipitate crystals. The precipitated crystals were filtered, washed with methanol, and dried to obtain 610 g of a white powder. At this time, the gel strength was 225 g in 10% (w / w) mineral oil.

[0063] <Experimental Example 1> Evaluation of Transparency 1 The transparency of the dextrin palmitate obtained in Example 1 and Comparative Example 1 was measured according to the transmittance measurement method.

[0064] In this case, the transmittance measurement method involved dissolving 5 g of dextrin palmitate obtained in Example 1 and Comparative Example 1 in 45 g of mineral oil (Lilly 70 manufactured by Kyokuto Yuka Kogyo Co., Ltd.) at 90°C. This was placed in a 1 cm cell, then in an incubator and kept at 25°C for 24 hours to gel, and then the transmittance at 350-500 nm was measured using a spectrophotometer.

[0065] The results are shown in Table 1 below.

[0066] [Table 1]

[0067] From the results in Table 1, when the dextrin palmitate produced in Example 1 was added to mineral oil at a concentration of 10% (w / w) to form a gel, the transmittance at a wavelength of 375 nm (1 cm cell) was 23.8%, whereas the transmittance of the gel produced in Comparative Example 1 was measured to be 3.5%. Therefore, the gel of Example 1 showed approximately 6.8 times higher transmittance, confirming the transparency of the gel.

[0068] <Experimental Example 2> Evaluation of Transparency 2 To compare the transparency of the dextrin palmitate obtained in Example 1, the transmittance of the most widely available commercially sold dextrin palmitate (KL2 manufactured by Chiba Flour Milling Co., Ltd.) was measured using the same method as in Experimental Example 1.

[0069] The results are shown in Table 2 below, and the comparison results are shown in Figures 1 and 2.

[0070] [Table 2]

[0071] From the results in Table 2 above, when the dextrin palmitate produced in Example 1 was added to mineral oil at a concentration of 10% (w / w) to form a gel, the transmittance at a wavelength of 375 nm (1 cm cell) was 23.8%, whereas the transmittance of the commercially available product (KL2 manufactured by Chiba Flour Milling Co., Ltd.) was measured at 4.8% under the same wavelength conditions. Therefore, the gel of Example 1 showed approximately 5.0 times higher transmittance, confirming that the gel was 5 times more transparent.

[0072] Figure 1 shows the transmittance of the aforementioned samples at different wavelengths, confirming that the transparency of the dextrin palmitate produced by the manufacturing method of the present invention is remarkably high. Figure 2 shows a visual comparison of both samples.

[0073] <Experimental Example 3> Evaluation of the transparency of product dosage forms In Example 1, 10 g each of the dextrin palmitate produced and the commercially available product (KL2 manufactured by Chiba Flour Milling Co., Ltd.) were dissolved at 90°C along with 90 g of ethylhexyl palmitate, which is widely used as a cleansing oil. The mixture was then placed in a 1 cm cell and kept in a 25°C incubator for 24 hours to induce gelation. Subsequently, the transmittance was measured at 350-500 nm using a spectrophotometer.

[0074] The results are shown in Table 3 below, and the transmittance results are compared in Figure 3.

[0075] [Table 3]

[0076] As shown in Table 3 above, the cleansing oil containing dextrin palmitate produced in Example 1 was confirmed to have 2.8 times greater transparency at a wavelength of 375 nm (1 cm cell) compared to commercially available products.

[0077] Although the present invention has been described in detail only with respect to the specific examples described above, it will be obvious to those skilled in the art that various modifications and alterations are possible within the scope of the technical concept of the present invention, and it is natural that these modifications and alterations fall within the scope of the appended claims.

Claims

1. The first step involves adding dextrin to an organic mixed solvent containing a hexane-based solvent and dispersing it, then adding a fatty acid halide while maintaining the temperature at 0 to 120°C and allowing it to react. A second step involves adding water after the above reaction is complete to induce layer separation and separate the upper layer liquid, A third step involves precipitating crystals from the upper liquid and drying it, Includes, The organic mixed solvents have different polarities, and in the second step, the hexane-based solvent remains in the upper layer due to phase separation by water, thus separating the dextrin fatty acid ester. A method for producing dextrin fatty acid esters, characterized by the following:

2. The organic mixed solvent comprises a first solvent selected from the group consisting of n-hexane, cyclohexane, and methylcyclohexane, and a second solvent selected from the group consisting of dimethylformamide, dimethylacetamide, dimethyl sulfoxide (DMSO), and N-methyl-2-pyrrolidone (NMP). A method for producing dextrin fatty acid ester according to claim 1.

3. The aforementioned organic mixed solvent consists of methylcyclohexane and dimethylformamide. A method for producing dextrin fatty acid ester according to claim 1.

4. In the first step described above, the average degree of saccharide polymerization of the dextrin is 35 to 80. A method for producing dextrin fatty acid ester according to claim 1.

5. The aforementioned fatty acid is a higher fatty acid having 12 to 22 carbon atoms. A method for producing dextrin fatty acid ester according to claim 1.

6. The dextrin fatty acid ester is dextrin palmitate. A method for producing dextrin fatty acid ester according to claim 1.

7. The average degree of acylation substitution of the dextrin palmitate is 1.3 to 2.

5. A method for producing dextrin fatty acid ester according to claim 6.

8. A mixture comprising 2 to 20% by weight of dextrin fatty acid ester and 80 to 98% by weight of oil, produced by the method for producing dextrin fatty acid ester according to any one of claims 1 to 7. A transparent oil gel characterized by the following features.

9. The dextrin fatty acid ester is dextrin palmitate, and when blended with oil, it has a transmittance of 10% or more at a wavelength of 375 nm. The transparent oil gel according to claim 8.

10. A solid composition containing the transparent oil gel described in claim 8 as a base material. A transparent solid cosmetic characterized by the following features.

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