Oil-based cosmetic composition, oil-based cosmetic, and method for producing the same

Abstract

An oily cosmetic composition, an oily cosmetic, and a preparation method thereof belong to the field of cosmetics. The oily cosmetic composition does not contain water. The oily cosmetic composition includes: an oil-soluble polymer, an oil, and ascorbic acid. Among them, calculated by weight percentage, the content of ascorbic acid in the oily cosmetic composition is 1-40%. The oily cosmetic prepared from the above oily cosmetic composition can improve the long-term stability of ascorbic acid, is convenient to use, and does not affect the absorption of ascorbic acid.

Description

Technical Field

[0001] The present application relates to the field of cosmetics, and in particular, to an oily cosmetic composition, an oily cosmetic, and a preparation method thereof. Background Art

[0002] Ascorbic acid is commonly known as vitamin C. Due to the strong reducing effect of vitamin C based on the double bond structure of the second and third carbon atoms, it can effectively reduce reactive oxygen species in the body, which is beneficial to skin care and beauty. However, at the same time, due to strong oxidation reactions caused by factors such as heat, light, and oxygen in the atmosphere, its stability is impaired.

[0003] Since vitamin C is a water-soluble vitamin, when used in cosmetics, the presence of water is usually required to dissolve vitamin C and be absorbed by the skin. However, in the aqueous solution state where hydrogen ions dissociate, the problems of oxidation and poor stability of vitamin C are particularly prominent. Therefore, for cosmetic formulations prepared by dissolving high-content vitamin C in the aqueous phase, most of them have problems such as deterioration or separation of physical properties.

[0004] Therefore, in the prior art, in order to avoid the occurrence of the above problems, the usual improvement directions are: (1) developing ascorbic acid derivatives to enhance their oxidation stability while maintaining the efficacy of vitamin C. However, due to the different physical properties such as solubility characteristics of ascorbic acid derivatives depending on the types of molecules they bind to, it is difficult to maintain the original activity level achieved when applying ascorbic acid to the skin. Moreover, from a chemical perspective, the activity exhibited by the molecules bound to vitamin C is different from that of pure vitamin C. (2) Preparing ascorbic acid into forms such as nanoemulsions or nanoliposomes to minimize its exposure to water, air, heat, etc. to obtain its stability. For example, the water-in-oil emulsion cosmetic material of Korean Patent Publication No. 2000-0038845, the preparation of a bilayer cosmetic material composition containing high-content ascorbic acid of Korean Patent Publication No. 2018-0027918, the oil-in-polyol type non-aqueous emulsion cosmetic material of Korean Patent Publication No. 2002-0023574, etc. The preparation methods are complex and some have poor long-term stability. (3) To prevent the oxidation of vitamin C in end products such as cosmetics, methods such as adding antioxidants to the aqueous composition containing vitamin C and using multiple emulsion formulations are adopted. At this time, the presence of moisture in the final composition will also lead to a decrease in the long-term stability of vitamin C. Summary of the Invention

[0005] The present application provides an oily cosmetic composition, an oily cosmetic, and a preparation method thereof, which can solve the problem of poor long-term stability of high-content ascorbic acid.

[0006] The embodiments of the present application are implemented as follows:

[0007] In a first aspect, an example of the present application provides an oily cosmetic composition. The oily cosmetic composition does not contain water and includes: an oil-soluble polymer, an oil, and ascorbic acid. Among them, by weight percentage, the content of ascorbic acid in the oily cosmetic composition is 1-40%.

[0008] In the above setting, on the one hand, since the oily cosmetic composition does not contain water, it can effectively avoid the deterioration caused by the dissolution of vitamin C in water. On the other hand, using the oil-soluble polymer and the oil as the oil phase can enable ascorbic acid to be stably and uniformly dispersed in the oil phase in the form of solid small particles, isolating water, air, heat, etc., and avoiding the impairment of the stability of ascorbic acid. At the same time, when in use, just spreading it can make vitamin C evenly distributed on the skin surface, which is convenient to use. And due to the presence of the oil-soluble polymer, the oily cosmetic composition has a certain viscosity, which can make the vitamin C after spreading evenly and stably adhere to the skin surface and be dissolved and absorbed by the moisture on the skin surface. Moreover, after being applied to the skin, the oil phase has a certain water retention effect to enable vitamin C to be fully dissolved.

[0009] In summary, for the oily cosmetic prepared from the above oily cosmetic composition, a high content of ascorbic acid can be directly added, which can effectively improve the long-term stability of ascorbic acid. At the same time, it is convenient to use and does not affect the absorption of ascorbic acid, and the oily cosmetic composition is applicable to a wider range of dosage forms.

[0010] In a second aspect, an example of the present application provides a preparation method for an oily cosmetic, which includes:

[0011] Mix the oil-soluble polymer and the oil in the above oily cosmetic composition as the oil phase; mix ascorbic acid with the oil phase at a temperature of 15-30°C to disperse ascorbic acid in the oil phase.

[0012] In the above setting, the preparation method is simple to operate. At the same time, the method of mixing ascorbic acid with the oil phase at a temperature of 15-30°C can avoid affecting the stability of ascorbic acid due to too high a temperature of the oil phase.

[0013] In a third aspect, an example of the present application provides an oily cosmetic. The oily cosmetic does not contain water and includes: an oil phase and ascorbic acid. The oil phase includes an oil-soluble polymer and an oil, and ascorbic acid is dispersed in the oil phase; among them, by weight percentage, the content of ascorbic acid in the oily cosmetic is 1-40%, and the particle size of ascorbic acid is 5-100 μm.

[0014] In the above setting, it can not only improve the long-term stability of ascorbic acid, but also the ascorbic acid particles with a particle size of 5-100 μm can further improve the comfort of use, and at the same time, it is also beneficial to rapid dissolution and does not affect the absorption of ascorbic acid. Description of the Drawings

[0015] To more clearly illustrate the technical solutions of the embodiments of the present application, the accompanying drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present application, and therefore should not be regarded as a limitation of the scope. For those of ordinary skill in the art, without creative efforts, other related drawings can also be obtained based on these drawings.

[0016] Figure 1 Optical microscope photos of ascorbic acid before and after grinding and pulverization provided for Example 1;

[0017] Figure 2 Appearance photos of the oily cosmetics prepared for Examples 1-3 and Comparative Example 1. Specific Embodiments

[0018] The following will describe the implementation schemes of the present application in detail in combination with the embodiments. However, those skilled in the art will understand that the following embodiments are only used to illustrate the present application and should not be regarded as limiting the scope of the present application. For those not specified in the embodiments, they are carried out according to the conventional conditions or the conditions recommended by the manufacturer. For the reagents or instruments not specified in the manufacturer, they are all conventional products that can be obtained through commercial purchase.

[0019] Throughout the specification of the present invention, unless otherwise required in the article, "comprising" and "including" mean including the mentioned stages or components, or a group including multiple stages or multiple components, but do not exclude any other arbitrary stages or components, or a group of multiple stages or multiple components.

[0020] Since vitamin C is a water-soluble vitamin, when used in cosmetics, the presence of water is required to dissolve vitamin C and be absorbed by the skin. However, at this time, due to the presence of water, its stability is damaged. If a solid powder mixture of vitamin C and antioxidants is directly used as a cosmetic, there is an obvious foreign body sensation when directly used, so it is not suitable for use in cosmetics. At the same time, it cannot be evenly attached to the skin surface when directly used. Therefore, it usually needs to be pre-dissolved in water and then applied to the skin surface to be evenly absorbed, which is inconvenient to use.

[0021] In view of this, the present application is hereby proposed.

[0022] In a first aspect, the present application provides an oily cosmetic composition. The oily cosmetic composition does not contain water and includes: an oil-soluble polymer, an oil, and ascorbic acid.

[0023] Since the oily cosmetic composition does not contain water, it can effectively avoid the deterioration caused by the dissolution of vitamin C in the aqueous phase. At the same time, an oil-soluble polymer and oil are used as the oil phase, so that ascorbic acid can be stably and uniformly dispersed in the oil phase in the form of solid small particles, isolating water, air, heat, etc., preventing ascorbic acid from being oxidized when exposed to water, air, etc., and avoiding the impairment of the stability of ascorbic acid. When in use, simply spreading it can evenly distribute vitamin C on the skin surface.

[0024] Since the oil phase has a certain lubricating effect, it is convenient to spread and improve the comfort of use. Due to the presence of the oil-soluble polymer, the oily cosmetic composition has a certain viscosity, which can make the vitamin C after spreading adhere to the skin surface evenly and stably and be dissolved and absorbed by the moisture on the skin surface, making it convenient to use. At the same time, after being applied to the skin, it has a certain water retention effect, enabling vitamin C to be fully dissolved. And under the above set conditions, the oily cosmetic composition can be made into liquid, solid or semi-solid cosmetics, with a wider range of applicable dosage forms.

[0025] Among them, calculated by weight percentage, the content of ascorbic acid in the oily cosmetic composition is 1-40%, for example, the content of ascorbic acid in the oily cosmetic composition is 1%, 3%, 5%, 10%, 15%, 17%, 20%, 23%, 25%, 30%, 35%, 37% or 40%, etc.

[0026] Calculated by weight percentage, when the content of ascorbic acid in the oily cosmetic composition is less than 1%, its skin improvement effect is very slight and it is not suitable to be used as a cosmetic material composition. When the addition amount is greater than 40%, the irritation of ascorbic acid to the skin is too large, and the dosage form stability of the cosmetics prepared from the oily cosmetic composition is reduced, so it is not recommended. In other words, even if the oily cosmetic composition contains a high content of ascorbic acid, it can have excellent long-term stability.

[0027] Optionally, calculated by weight percentage, the content of ascorbic acid in the oily cosmetic composition is 1-30%. Within this range, it takes into account having lower skin irritation and better dosage form stability.

[0028] The oil can be at least one of vegetable oil, mineral oil and synthetic oil that can be used in the cosmetic field, for example, the oil is ester oil, hydrocarbon oil, mineral oil or vegetable oil, etc.

[0029] In some alternative embodiments, the oil includes at least one of C12-15 Alkyl Benzoate, Isododecane, Cetyl Ethylhexanoate, Isohexadecane, mineral oil, Hydrogenated Polydecene, Dibutyl Adipate, Octyldodecanol, jojoba oil, Caprylic / Capric Tryglycerides.

[0030] Optionally, the oil is selected from at least one of C12-15 Alkyl Benzoate, Isododecane, Cetyl Ethylhexanoate.

[0031] In some alternative embodiments, by weight percentage, the content of the oil in the oily cosmetic composition is 50-95%, for example, the content of the oil in the oily cosmetic composition is any value among 50%, 55%, 57%, 60%, 65%, 67%, 80%, 83%, 85%, 87%, 90%, 91% or 95% or any value between any two of these values. Optionally, by weight percentage, the content of the oil in the oily cosmetic composition is 60-80%. Among them, the content of the oil can be adjusted according to the desired sense of use.

[0032] The oil-soluble polymer can be any oil-soluble polymer known in the cosmetic field. For example, oil-soluble polymers including plant polymers, mineral polymers, silicone-based polymers, synthetic polymers and their copolymers can be used.

[0033] In some alternative embodiments, the oil-soluble polymer includes at least one of Hydrogenated Styrene / Isoprene Copolymer and Hydrogenated Styrene / Butadiene Copolymer. For example, the oil-soluble polymer can be Hydrogenated Styrene / Isoprene Copolymer or Hydrogenated Styrene / Butadiene Copolymer, or a mixture of the two.

[0034] Optionally, the oil-soluble polymer is Hydrogenated Styrene / Isoprene Copolymer.

[0035] In some alternative embodiments, the content of the oil-soluble polymer in the oily cosmetic composition is 1-10% by weight; for example, by weight percentage, the content of the oil-soluble polymer in the oily cosmetic composition is 1%, 2%, 3%, 5%, 7%, 8%, 9% or 10%, etc. The above content is reasonable, taking into account the usability and stability. When the content of the polymer in the oily cosmetic composition is less than 1%, the dosage form stability of the cosmetic material composition will decrease, so it is not recommended. When it is greater than 10%, due to the difficulty in applying to the high viscosity and sticky usability of the cosmetic material composition, it is not suitable for use as a cosmetic material composition.

[0036] Optionally, by weight percentage, the content of the oil-soluble polymer in the oily cosmetic composition is 2-6%. Within the above range, better usability and better stability are taken into account.

[0037] It should be noted that in the above-mentioned oily cosmetic composition, in addition to containing no water and containing an oil-soluble polymer, oil and ascorbic acid as essential components, it can also be appropriately selected and formulated according to the actual types of external dosage forms, appearance, taste, and usage purposes, etc. That is, within the range that does not weaken the effects of the present application, components conventionally used in existing products can be added. For example, carriers, fragrances, dispersants, solubilizers, surfactants, preservatives, etc. can be used.

[0038] It should be noted that the oily cosmetic composition provided by the present application can be prepared into any dosage form conventionally manufactured in the art, such as gels, creams, ointments, oils, etc., but is not limited thereto. More specifically, it can be made into nourishing creams, massage creams, essential oils, eye creams, etc.

[0039] For example, when the dosage form is an emulsion, cream or gel, the carrier component can be selected from animal oils, vegetable oils, waxes, paraffins, starches, celluloses, polyethylene glycols, silicones, bentonites, silica, talc or zinc oxide, etc.

[0040] In a second aspect, the present application provides a method for preparing an oily cosmetic, which includes:

[0041] S1. Dissolve the oil-soluble polymer in the oily cosmetic composition provided in the first aspect in oil to form an oil phase.

[0042] Among them, in order to dissolve the oil-soluble polymer in oil, optionally, the oil is first heated to 75-85 °C and then mixed, or the oil-soluble polymer and oil are mixed and then heated to 75-85 °C, so that the oil-soluble polymer is uniformly dissolved and dispersed in the oil by using the increase in temperature.

[0043] S2. Mix ascorbic acid with an oil phase at a temperature of 15 - 30°C to disperse the ascorbic acid in the oil phase.

[0044] Since the particle size of the ascorbic acid powder commonly sold on the market is usually large, or there are some particles with a particle size greater than 100 μm, in some alternative embodiments, the step of mixing ascorbic acid with the oil phase includes: obtaining a slurry after adding ascorbic acid to the oil phase; grinding and pulverizing the slurry so that the particle size of the ground and pulverized ascorbic acid is 5 - 100 μm, for example, the particle size of the ground and pulverized ascorbic acid is 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm, etc. The ascorbic acid has a smaller particle size within the above range, and there is basically no foreign body sensation during use, improving the comfort of use. At the same time, it can be quickly dissolved and absorbed by the moisture on the skin surface after being spread.

[0045] Further optionally, the particle size of the ground and pulverized ascorbic acid is 5 - 50 μm. There is no foreign body sensation during use within this range, and it is convenient to be quickly dissolved and absorbed by the moisture on the skin surface.

[0046] Among them, grinding and pulverizing can be carried out using grinders such as a three - roll mill, a jet mill, a ball mill, etc.

[0047] In addition to the grinding method during the above - mentioned preparation process, it is also possible to customize or self - make ascorbic acid ultrafine powder with a particle size of 5 - 100 μm. At this time, there is no need for grinding treatment, and direct mixing, such as stirring and dispersing, can be carried out. Therefore, in some other alternative embodiments, among the raw materials used in the oily cosmetic composition, the particle size of ascorbic acid is 5 - 100 μm; the particle size of ascorbic acid is 5 μm, 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 60 μm, 70 μm, 75 μm, 80 μm, 85 μm, 90 μm, 95 μm or 100 μm, etc. The ascorbic acid has a smaller particle size within the above range, and there is basically no foreign body sensation during use, improving the comfort of use, and it can be quickly dissolved and absorbed by the moisture on the skin surface. Optionally, the particle size of ascorbic acid is 5 - 50 μm.

[0048] In a third aspect, the present application provides an oil-based cosmetic, which does not contain water. The oil-based cosmetic includes: an oil phase and ascorbic acid. The oil phase includes an oil-soluble polymer and oil, and ascorbic acid is dispersed in the oil phase. Among them, by weight percentage, the content of ascorbic acid in the oil-based cosmetic is 1-40%, and the particle size of ascorbic acid is 5-100 μm. Optionally, the particle size of ascorbic acid is 5-50 μm, which improves the comfort of use. The above-mentioned oil-based cosmetic can not only improve the stability of ascorbic acid and the comfort of use, but also the ascorbic acid in the oil-based cosmetic can be quickly dissolved and absorbed by the moisture on the skin surface.

[0049] Among them, the content of the oil-soluble polymer in the oil-based cosmetic is 1-10%, and the content of the oil in the oil-based cosmetic is 50-95%. The above-mentioned oil-based cosmetic not only has viscosity, but also has excellent long-term stability even when it contains a high content of ascorbic acid.

[0050] Optionally, the dosage form of the oil-based cosmetic includes but is not limited to a gel, and can also be a cream, ointment, oil, etc., but is not limited thereto. More specifically, it can be made into a nutritional cream, massage cream, essence oil, eye cream, etc.

[0051] The following further describes in detail the oil-based cosmetic composition, oil-based cosmetic and its preparation method of the present application in combination with examples.

[0052] In the following Examples 1-3 and Comparative Example 1, the appropriate amount of the additive phase means that the content and ratio of the additive phase in Examples 1-3 and Comparative Example 1 are the same. However, since it does not affect the final result, as long as it meets the addition requirements of cosmetics, it is acceptable.

[0053] Example 1

[0054] According to the components of the cosmetic composition shown in Table 1, the following method is used to prepare the oil-based cosmetic:

[0055] First, the oil phase components are mixed and heated to 80 °C to mix the components of the oil phase in a uniformly dissolved manner. After uniform dissolution, it is cooled to room temperature (25 °C), and ascorbic acid and the additive phase are added and uniformly dispersed to obtain a slurry. The slurry is processed by a three-roll mill to grind and crush ascorbic acid and disperse it in the oil phase.

[0056] Among them, Figure 1 (a) is an optical microscope photograph of ascorbic acid before grinding and crushing by a three-roll mill, and (b) is an optical microscope photograph of ascorbic acid after grinding and crushing by a three-roll mill. Among them, the scale bars in the lower right corners of (a) and (b) are both 50 μm.

[0057] According to Figure 1 , it can be clearly seen that using a three-roll mill to process the slurry can effectively refine ascorbic acid.

[0058] Example 2-3 and Comparative Example 1

[0059] The differences between Example 2-3 and Comparative Example 1 and Example 1 are only the different raw material ratios in Table 1.

[0060] Table 1 Composition of Cosmetic Composition

[0061]

[0062] The oily cosmetics prepared in Examples 1-3 and Comparative Example 1 were respectively packed in transparent sample bottles, and their appearances are as Figure 2 shown.

[0063] According to Figure 2 , it can be seen that the oily cosmetics prepared in Examples 1-3 are all uniformly distributed white, and as the content of ascorbic acid increases, the white color of the oily cosmetics deepens, while the oily cosmetics of Comparative Example 1 are transparent. Based on the fact that ascorbic acid powder is white powder, therefore, those skilled in the art can undoubtedly determine that ascorbic acid in Examples 1-3 is actually uniformly dispersed in the oil phase in the form of solid, rather than in a dissolved form.

[0064] Test Example

[0065] The oily cosmetics prepared in Examples 1-3 were divided into two groups. One group was stored in a constant temperature bath at 4°C for four weeks (28 days), and the other group was stored in a constant temperature bath at 45°C (high temperature) for four weeks (28 days). After the experiment, ascorbic acid was quantitatively analyzed by HPLC. The results are shown in Table 2.

[0066] Table 2 Results of Long-term Stability Test

[0067]

[0068] According to Table 2, the titer evaluation was carried out on the samples stored under the conditions of 4°C and 45°C, and it was confirmed that ascorbic acid can be maintained long-term and stably at high temperature. At the same time, according to Example 2 and Example 3, it can be seen that the oily cosmetics can have excellent long-term stability even if they contain a high content of ascorbic acid.

[0069] In summary, the present application provides an oily cosmetic composition, an oily cosmetic and a preparation method thereof, which can avoid the problem of poor long-term stability of ascorbic acid, enable ascorbic acid to maintain long-term stability at high temperature, and are convenient to use without affecting the absorption of ascorbic acid.

[0070] The above are only specific embodiments of the present application and are not intended to limit the present application. For those skilled in the art, various modifications and changes can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An oil-based cosmetic composition, characterized in that, The oil-based cosmetic composition does not contain water, and the oil-based cosmetic composition includes: an oil phase and ascorbic acid. The oil phase consists of an oil-soluble polymer and an oil. The oil-soluble polymer includes at least one of a hydrogenated styrene / isoprene copolymer and a hydrogenated styrene / butadiene copolymer. The oil is selected from ester oils; Wherein, by weight percentage, the content of ascorbic acid in the oil-based cosmetic composition is 1-40%. The ascorbic acid is dispersed in the oil phase in a solid form, and the particle size of the ascorbic acid is 5-100 μm.

2. The oily cosmetic composition according to claim 1, characterized in that, By weight percentage, the content of ascorbic acid in the oil-based cosmetic composition is 1-30%.

3. The oily cosmetic composition according to claim 1, characterized in that, The oil-soluble polymer is a hydrogenated styrene / isoprene copolymer.

4. The oily cosmetic composition according to claim 1, characterized in that, By weight percentage, the content of the oil-soluble polymer in the oil-based cosmetic composition is 1-10%.

5. The oily cosmetic composition according to claim 1, characterized in that, By weight percentage, the content of the oil-soluble polymer in the oil-based cosmetic composition is 2-6%.

6. The oil-based cosmetic composition according to claim 1, wherein The oil includes C12-15 alkyl benzoate and cetyl alcohol ethylhexanoate.

7. The oily cosmetic composition according to claim 1, characterized in that, By weight percentage, the content of the oil in the oil-based cosmetic composition is 50-95%.

8. The oil-based cosmetic composition according to claim 1, characterized in that, By weight percentage, the content of the oil in the oil-based cosmetic composition is 60-80%.

9. A method for preparing an oily cosmetic, characterized in that, Including: Mixing the oil-soluble polymer and the oil in the oil-based cosmetic composition according to any one of claims 1-8 as the oil phase; Mixing the ascorbic acid with the oil phase at a temperature of 15-30 °C to disperse the ascorbic acid in the oil phase.

10. The preparation method according to claim 9, characterized in that, The step of mixing the ascorbic acid with the oil phase includes: obtaining a slurry after adding the ascorbic acid to the oil phase; grinding and pulverizing the slurry so that the particle size of the ground and pulverized ascorbic acid is 5-100 μm.

11. The preparation method according to claim 10, characterized in that, The particle size of the ground and pulverized ascorbic acid is 5-50 μm.

12. The preparation method according to claim 9, wherein The particle size of the ascorbic acid is 5-100 μm.

13. The preparation method according to claim 9, characterized in that, The particle size of the ascorbic acid is 5-50 μm.

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