A high-transparency gel-type sunscreen cosmetic and a method for preparing the same

Abstract

The present application relates to a kind of high transparent gel dosage form sunscreen cosmetic and its preparation method, the component of the high transparent gel dosage form sunscreen cosmetic includes oryzanol, organic sunscreen agent, solvent and oil phase rheological modifier.The present application provides a kind of brand-new sunscreen cosmetic, appearance clear and transparent, rich visual, skin feel experience, while the sunscreen cosmetic has high sun protection factor, fills the market blank.

Description

Technical Field

[0001] This invention belongs to the field of cosmetics, and relates to a sunscreen cosmetic, and more particularly to a highly transparent gel-type sunscreen cosmetic and its preparation method. Background Technology

[0002] Ultraviolet (UV) radiation in nature primarily originates from sunlight. UV radiation is a portion of the electromagnetic waves that reach Earth from the sun; its wavelength is shorter than visible light and is imperceptible to the human eye. Based on wavelength, UV radiation can be divided into short-wave UVC (100nm-280nm), medium-wave UVB (280nm-320nm), and long-wave UVA (320nm-400nm). UVC is generally blocked by the ozone layer and rarely reaches the Earth's surface, thus having a relatively small impact on humans. However, UVB and UVA can have certain physiological effects on human skin. Excessive exposure to UV radiation can cause sunburn and redness in a short time with UVB; UVA can cause tanning. Furthermore, UVA has strong penetrating power, penetrating the epidermis and reaching the dermis, damaging collagen, elastic fibers, and other fine structures within the skin, leading to wrinkles, fine lines, and premature aging.

[0003] Sunscreen has become a crucial part of daily skincare. Sunscreen products provide effective UV protection, preventing sunburn and tanning, and combating photoaging. Currently, sunscreen products and existing technologies on the market offer two main formulation types: emulsified and non-emulsified. Emulsified formulations are the preferred choice for most sunscreens due to their superior skin feel. However, the higher the SPF of a emulsified product, the higher the risk of formulation instability, making it difficult to simultaneously achieve high SPF, stable, non-layered formulation, and a refreshing feel. Therefore, layered formulations are common in high SPF products of this type, such as shake-to-use lotions and sunscreen sprays. Users must shake well before use; failure to do so significantly reduces the product's actual sun protection efficacy. Furthermore, these products have more complex manufacturing and filling processes. Non-emulsified formulations include pure oil systems, water systems, silicone elastic systems, and powders. Pure oil-based sunscreens, also known as sunscreen oils, have a greasy feel and a poor user experience, and are commonly used in body sunscreens, which has certain limitations. Sunscreen waters have relatively simple functions and cannot achieve strong water resistance and friction resistance like other formulations. Silicone-based formulations are a relatively new type of formulation that has become popular with consumers because of their pore-minimizing effect, but currently cannot achieve a high sun protection factor of SPF50+ or ​​higher. Powder formulations, such as sunscreen powders, are difficult to achieve a high sun protection factor due to formulation limitations. Summary of the Invention

[0004] To address the shortcomings of existing technologies, the present invention aims to provide a highly transparent gel-type sunscreen cosmetic and its preparation method.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] In a first aspect, the present invention provides a highly transparent gel-type sunscreen cosmetic, wherein the components of the highly transparent gel-type sunscreen cosmetic include oryzanol, organic sunscreen agents, solvents, and oil phase flow modifiers.

[0007] The high-transparency gel-type sunscreen cosmetic described in this invention has excellent sun protection effect, and its clear and transparent appearance enriches the visual and skin-feel experience, filling a market gap.

[0008] This oil-phase rheology modifier has a soft, non-sticky texture and is compatible with most oils. The mixture primarily relies on polymer-polymer and polymer-oil hydrogen bonds to build a physical network structure within the oil phase. The oil phase is immobilized within this network structure, forming a gel phase that thickens and suspends the product. This allows for the preparation of products with high transparency, high viscosity, and high suspension properties. In this invention, the mixture exhibits good compatibility with oil-based sunscreens. By thickening the sunscreen phase, it forms a clear and transparent gel, while simultaneously reducing sunscreen migration and penetration, creating a sun-protective and water-repellent film on the skin surface, thereby increasing the sun protection factor and enhancing overall protection.

[0009] Oryzanol, also known as rice bran extract, is found in cereal grains and is non-irritating and harmless to the skin. It has a broad absorption spectrum, absorbing both UVA and UVB rays. When used in sunscreen products, it can alleviate and repair skin discomfort caused by organic sunscreens and ultraviolet radiation. Furthermore, oryzanol possesses anti-inflammatory, whitening, and antioxidant properties, and numerous studies have demonstrated its effectiveness against inflammation caused by sun exposure and ultraviolet radiation.

[0010] Preferably, the solvent includes any one or a combination of at least two of neopentyl glycol diheptanoate, isopropyl isostearate, or C12-15 alcohol benzoate.

[0011] Preferably, the high-transparency gel-type sunscreen cosmetic comprises, by weight percentage, 0.01%-5% oryzanol, 7%-26.5% organic sunscreen agent, 2%-40% oil phase rheology modifier, and 28.5%-90.99% solvent.

[0012] When the four components in the highly transparent gel-form sunscreen cosmetic are added at the specific mass percentages mentioned above, the sunscreen effect can be maximized.

[0013] The mass percentage of oryzanol can be selected from 0.01%, 0.1%, 0.5%, 1%, 1.5%, 2%, 2.5%, 3%, 3.5%, 4%, 4.5%, 5%, etc.; the mass percentage of the organic sunscreen agent can be selected from 7%, 9%, 11%, 13%, 15%, 17%, 19%, 21%, 23%, 25%, 26.5%, etc.; and the mass percentage of the oil phase rheology modifier can be selected from 2%, 4%, 6%, 8%, 10%, 1%, etc. 2%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, 30%, 32%, 34%, 36%, 38%, 40%, etc., and the mass percentage content of the solvent can be selected from 28.5%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, 85%, 90%, 90.99%, etc. Other specific point values ​​within the above range can be selected, and will not be elaborated here.

[0014] Preferably, the organic sunscreen agent comprises any one or a combination of at least two of the following: isoamyl methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl triazine ketone, ethylhexyl salicylate, or diethylhexyl butamidotriazine ketone. More preferably, it is a combination of isoamyl methoxycinnamate, hexyl diethylamino hydroxybenzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexyl butamidotriazine ketone.

[0015] This application creatively discovers that isoamyl p-methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexyl butamidotriazinone among organic sunscreens have a certain synergistic effect in enhancing sun protection efficacy.

[0016] Preferably, the mass ratio of isoamyl p-methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexyl butamidotriazinone in the organic sunscreen is (3-8):(1-4.5):(1-5):(1-5):(1-4).

[0017] When the five components of the organic sunscreen are combined in the specific mass ratio described above, the sunscreen effect can be maximized.

[0018] The specific point values ​​in (3-8) can be selected from 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 7.5, 8, etc.; the specific point values ​​in (1-4.5) can be selected from 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, etc.; the specific point values ​​in (1-5) can be selected from 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, etc.; the specific point values ​​in (1-4) can be selected from 1, 1.5, 2, 2.5, 3, 3.5, 4, etc. Other specific point values ​​within the above range can be selected, which will not be elaborated here.

[0019] Preferably, the oil phase rheology modifier includes hydrogenated C6-20 polyolefin, HDI / trimethylolhexyl lactone crosspolymer, and caprylic / capric triglyceride.

[0020] Preferably, the highly transparent gel-form sunscreen cosmetic also includes walnut oil.

[0021] The addition of walnut oil can further enhance the sun protection effect of this product, and walnut oil and oryzanol have a certain synergistic effect in improving the sun protection effect.

[0022] Preferably, the mass percentage of walnut oil in the high-transparency gel-type sunscreen cosmetic is 0.01%-2%, such as 0.01%, 0.1%, 0.5%, 1%, 1.5%, 2%, etc. Other specific values ​​within the above range can be selected, and will not be elaborated here.

[0023] The sun protection effect is most significantly enhanced when walnut oil is added at the specific mass percentage mentioned above.

[0024] In a second aspect, the present invention provides a method for preparing a highly transparent gel-type sunscreen cosmetic according to the first aspect, the method comprising:

[0025] (1) Mix the oil-phase rheology modifier, solvent and organic sunscreen agent;

[0026] (2) Mix the product obtained in step (1) with oryzanol, cool it down, and evacuate it to obtain the final product.

[0027] Preferably, step (1) is performed at 90-95℃, such as 90℃, 91℃, 92℃, 93℃, 94℃, 95℃, etc. Other specific point values ​​within the above range can be selected, and will not be described in detail here.

[0028] Preferably, the product obtained in step (1) is mixed with oryzanol at a temperature of 50-60°C, such as 50°C, 51°C, 52°C, 53°C, 54°C, 55°C, 56°C, 57°C, 58°C, 59°C, 60°C, etc. Other specific values ​​within the above range can be selected, and will not be described in detail here.

[0029] Preferably, the vacuuming is performed at 40-50°C, such as 40°C, 41°C, 42°C, 43°C, 44°C, 45°C, 46°C, 47°C, 48°C, 49°C, 50°C, etc. Other specific values ​​within the above range can be selected, and will not be elaborated here.

[0030] Compared with the prior art, the present invention has the following beneficial effects:

[0031] This invention provides a novel sunscreen cosmetic formulation: a non-emulsifying, highly transparent gel formulation. The highly transparent gel sunscreen cosmetic of this invention has a clear and transparent appearance, enriching the visual and skin-feel experience. At the same time, this sunscreen cosmetic has a high sun protection factor, filling a market gap. Detailed Implementation

[0032] To further illustrate the technical means and effects of the present invention, the following describes the technical solution of the present invention in conjunction with preferred embodiments of the present invention. However, the present invention is not limited to the scope of the embodiments.

[0033] The sources of the active ingredients in the products involved in the following examples and comparative examples are as follows (only the active ingredients are shown; the necessary excipients contained in other commercially available raw materials are not described):

[0034] Oryzanol was purchased from a product called γ-ORYZANOL from Tsukino Rice Chemical Co., Ltd. in Japan.

[0035] The flat-kernel wood oil was purchased from a product called Qingci fruit oil from Shanghai Guzidi Industrial Co., Ltd.

[0036] C12-15 alcohol benzoate was obtained from a product called SPCRODAMOL AB MBAL purchased from Croda Chemicals (Shanghai) Co., Ltd.

[0037] The oil phase rheology modifier was purchased from Lubrizol Specialty Chemicals Ltd. and its trade name is OILKEMIA. TM 5SCC products.

[0038] Example 1

[0039] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which comprises, by weight percentage, 1.5% oryzanol, 6% isoamyl p-methoxycinnamate, 2.5% hexyl diethylamino hydroxybenzoyl benzoate, 3% bis-ethylhexyloxyphenol methoxyphenyl triazine, 3% ethylhexyl salicylate, 2% diethylhexylbutamidotriazine, 22% oil phase rheology modifier, and the balance being neopentyl glycol diheptanoate.

[0040] Its preparation method is as follows:

[0041] (1) The oil phase rheology modifier, neopentyl glycol diheptanoate, p-methoxycinnamate isoamyl ester, diethylamino hydroxybenzoyl benzoate hexyl ester, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate and diethylhexylbutamidotriazine ketone are mixed at 93°C. The oil phase rheology modifier includes hydrogenated C6-20 polyolefin, HDI / trimethylolhexyl lactone crosspolymer and caprylic / capric triglyceride.

[0042] (2) Mix the product obtained in step (1) with oryzanol at 55°C, cool to 45°C, and vacuum to obtain the final product.

[0043] Example 3

[0044] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which comprises, by weight percentage, 1% oryzanol, 1.5% isoamyl p-methoxycinnamate, 2% diethylamino hydroxybenzoyl benzoate, 2% bis-ethylhexyloxyphenol methoxyphenyl triazine, 2% ethylhexyl salicylate, 2% diethylhexylbutamidotriazine, 40% oil phase rheology modifier, and the balance being C12-15 alcohol benzoate.

[0045] Its preparation method is as follows:

[0046] (1) The oil phase rheology modifier, C12-15 alcohol benzoate, p-methoxycinnamate isoamyl ester, diethylamino hydroxybenzoyl benzoate hexyl ester, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate and diethylhexylbutamidotriazine ketone are mixed at 90°C. The oil phase rheology modifier includes hydrogenated C6-20 polyolefin, HDI / trimethylolhexyl lactone crosspolymer and caprylic / capric triglyceride.

[0047] (2) Mix the product obtained in step (1) with oryzanol at 60°C, cool to 50°C, and vacuum to obtain the product.

[0048] Example 4

[0049] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which differs from Example 1 only in that it does not contain isoamyl p-methoxycinnamate. The reduced mass of isoamyl p-methoxycinnamate is proportionally allocated to the mass of diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexyl butamidotriazine ketone, while other ingredients and contents remain unchanged.

[0050] The preparation method is the same as in Example 1.

[0051] Example 5

[0052] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which differs from Example 1 only in that it does not contain diethylaminobenzoylhexyl benzoate. Instead, the reduced mass of diethylaminobenzoyl hexyl benzoate is proportionally allocated to the mass of isoamyl p-methoxycinnamate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexylbutamidotriazinone, while the other ingredients and contents remain unchanged.

[0053] The preparation method is the same as in Example 1.

[0054] Example 6

[0055] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which differs from Example 1 only in that it does not contain bis-ethylhexyloxyphenol methoxyphenyl triazine. The reduced mass of bis-ethylhexyloxyphenol methoxyphenyl triazine is proportionally allocated to the mass of isoamyl p-methoxycinnamate, diethylaminohydroxybenzoylhexyl benzoate, ethylhexyl salicylate, and diethylhexylbutamidotriazinone, while the other ingredients and contents remain unchanged.

[0056] The preparation method is the same as in Example 1.

[0057] Example 7

[0058] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which differs from Example 1 only in that it does not contain ethylhexyl salicylate. Instead, the reduced mass of ethylhexyl salicylate is proportionally allocated to the mass of isoamyl p-methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, and diethylhexylbutamidotriazinone, while the other ingredients and contents remain unchanged.

[0059] The preparation method is the same as in Example 1.

[0060] Example 8

[0061] This embodiment provides a highly transparent gel-type sunscreen cosmetic, which differs from Example 1 only in that it does not contain diethylhexylbutamidotriazine. The reduced mass of diethylhexylbutamidotriazine is proportionally allocated to the mass of isoamyl p-methoxycinnamate, diethylaminohydroxybenzoylhexylbenzoate, bis-ethylhexyloxyphenol methoxyphenyltriazine, and ethylhexyl salicylate, while the other ingredients and contents remain unchanged.

[0062] The preparation method is the same as in Example 1.

[0063] Example 9

[0064] This embodiment provides a highly transparent gel-form sunscreen cosmetic, which comprises, by weight percentage, 1% oryzanol, 0.5% walnut oil, 6% isoamyl p-methoxycinnamate, 2.5% diethylaminobenzoyl benzoate, 3% bis-ethylhexyloxyphenol methoxyphenyl triazine, 3% ethylhexyl salicylate, 2% diethylhexylbutamidotriazine, 22% oil phase rheology modifier, and the balance being neopentyl glycol diheptanoate.

[0065] Its preparation method is as follows:

[0066] (1) The oil phase rheology modifier, neopentyl glycol diheptanoate, p-methoxycinnamate isoamyl ester, diethylamino hydroxybenzoyl benzoate hexyl ester, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate and diethylhexylbutamidotriazine ketone are mixed at 93°C. The oil phase rheology modifier includes hydrogenated C6-20 polyolefin, HDI / trimethylolhexyl lactone crosspolymer and caprylic / capric triglyceride.

[0067] (2) The product obtained in step (1) is mixed with oryzanol and walnut oil at 55°C, cooled to 45°C, and vacuumed to obtain the final product.

[0068] Comparative Example 1

[0069] This comparative example provides a highly transparent gel-type sunscreen cosmetic, which differs from Example 9 only in that it does not contain oryzanol, and the reduced mass of oryzanol is allocated to the mass of walnut oil, while other ingredients and contents remain unchanged.

[0070] The preparation method is the same as in Example 9.

[0071] Test Example 1

[0072] Sunscreen cosmetics sun protection factor (SPF) value determination

[0073] (1) Experimental basis: The method of Section 2, Chapter 8 of the Cosmetic Safety Technical Specifications (2015 Edition) was used to test the sun protection factor (SPF value) of the human body. The SPF value reflects the sun protection efficacy.

[0074] (2) Subject selection: 40 healthy men and 60 women aged 18-60 were recruited and divided into 10 groups, each group consisting of 4 men and 6 women, meeting the subject selection criteria.

[0075] (3) Experimental Method: Subjects were positioned in a forward-leaning position, and their backs were irradiated. The minimum erythema dose (MED) of the subject's skin to ultraviolet radiation was predicted 24 hours prior to the test, and the ultraviolet radiation dose was adjusted based on the prediction results for sample testing. On the day of the test, a spot no less than 30cm long was first selected on the subject's back. 2 In normal skin areas, at (2.00±0.05) mg / cm² 2 The sample to be tested or the standard control was evenly applied to the above-mentioned area, and then an appropriate ultraviolet irradiation dose was selected. Irradiation was carried out under three conditions: ① no sample was applied to the subject's skin; ② the standard control was applied; ③ the sample to be tested was applied. The experimental results were observed after 24 hours, and the MED values ​​were recorded under each of the three conditions. The standard control was a high SPF standard (P2), prepared according to the "Cosmetic Safety Technical Specifications (2015 Edition)". The SPF value of the standard control was 16.1 ± 2.4, and the SPF value of the standard protection for the subjects was within this range.

[0076] SPF value calculation method: SPF = MED value of protected skin / MED value of unprotected skin.

[0077] The SPF value for each test sample is the average of 10 subjects, accurate to one decimal place. The sampling error of the mean can be estimated by calculating the standard deviation and standard error of the data set. The 95% confidence interval (95% CI) of the mean should not exceed 17% of the mean; otherwise, the number of subjects should be increased (not exceeding 25) until the above requirement is met.

[0078] Table 1

[0079] Group Sample SPF value Example 1 45.6 Example 3 44.2 Example 4 40.9 Example 5 41.3 Example 6 38.4 Example 7 42.1 Example 8 38.8 Example 9 49.6 Comparative Example 1 35.6

[0080] As shown in Table 1, the transparent sunscreen gel of this invention has good sun protection effect. Furthermore, the organic sunscreen agents—isoamyl methoxycinnamate, diethylamino hydroxybenzoyl hexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexylbutamidotriazinone—have a certain synergistic effect in enhancing the sun protection effect. The addition of walnut oil can further improve the sun protection effect of the sunscreen gel, and oryzanol and walnut oil also have a certain synergistic effect on the above-mentioned effects.

[0081] Test Example 2

[0082] Long-wave ultraviolet protection index (PFA value) determination

[0083] (1) Experimental basis: The method of Section 4, Chapter 8 of the "Cosmetic Safety Technical Specifications (2015 Edition)" was used to test the long-wave ultraviolet protection index (PFA value), and the PFA value reflects the long-wave ultraviolet sun protection efficacy.

[0084] (2) Subject selection: 40 healthy men and 60 women aged 18-60 were recruited and divided into 10 groups, each group consisting of 4 men and 6 women, meeting the subject selection criteria.

[0085] (3) Experimental Method: Subjects were positioned in a forward-leaning position, and their backs were irradiated. The minimum melanization potential (MPPD) of the subject's skin to ultraviolet radiation was predicted 24 hours prior to the test, and the ultraviolet radiation dose was adjusted based on the prediction results for sample testing. On the day of the test, a spot no less than 30cm long was first selected on the subject's back. 2 In normal skin areas, at (2.00±0.05) mg / cm² 2 The sample to be tested or the standard control was evenly applied to the above-mentioned area. Then, an appropriate UVA irradiation dose was selected, and irradiation was carried out under three conditions: ① no sample was applied to the subject's skin; ② the standard control was applied; ③ the sample to be tested was applied. The experimental results were observed after 3 hours, and the MPPD values ​​under the three conditions were recorded. The standard control was prepared according to the "Cosmetic Safety Technical Specifications (2015 Edition)". The PFA value of the standard control was 4.4 ± 0.6, and the PFA values ​​of the subjects protected by the standard were all within this range.

[0086] PFA value calculation method: PFA = MMPD value of protected skin / MMPD value of unprotected skin

[0087] The MMPD value for each test sample is the average of 10 subjects, accurate to one decimal place. The sampling error of the mean can be estimated by calculating the standard deviation and standard error of the data set. The 95% confidence interval (95% CI) of the mean should not exceed 17% of the mean; otherwise, the number of subjects should be increased (not exceeding 25) until the above requirement is met.

[0088] Table 2

[0089]

[0090]

[0091] As shown in Table 2, the transparent sunscreen gel described in this invention has a good protective effect against long-wave ultraviolet (UV) radiation. Furthermore, the organic sunscreen agents—isoamyl methoxycinnamate, diethylaminobenzoylhexyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate, and diethylhexylbutamidotriazinone—exhibit a certain synergistic effect in protecting against UV radiation. The addition of walnut oil further enhances the protective effect against UV radiation, and oryzanol and walnut oil also exhibit a certain synergistic effect in the aforementioned effects.

[0092] Test Example 3

[0093] Skin occlusive patch test

[0094] (1) Experimental principle: Refer to Chapter 7 of the "Cosmetic Safety Technical Specifications (2015 Edition)" and Part 5 of the "Cosmetic Hygiene Specifications (2007 Edition)".

[0095] (2) Test material: area not exceeding 50 mm² 2 Qualified spot testing equipment with a depth of approximately 1mm

[0096] (3) Experimental methods:

[0097] Volunteers: A total of 34 people, 6 men and 28 women, aged 20-50, who met the inclusion criteria for subjects.

[0098] Test site: Inner side of the arm

[0099] Test period: 4 days

[0100] Negative control: blank, no treatment

[0101] Test time points: 0.5 hours, 24 hours, and 48 hours after patch removal.

[0102] Test Procedure: Eligible volunteers were selected for the test. A qualified patch applicator was used, and a closed patch test method was employed. Approximately 0.02 mL to 0.025 mL of the test substance was placed in the patch applicator chamber. The patch applicator was then applied to the inside of the subject's arm using hypoallergenic adhesive tape, and the palm was gently pressed to ensure even application to the skin. This process was continued for 24 hours. Skin reactions were observed according to the standards in Table 3 at 30 minutes (after the indentation disappeared), 24 hours, and 48 hours after removing the patch applicator, and the results were recorded. The test results are shown in Table 4.

[0103] Table 3

[0104]

[0105] Since the "Cosmetic Safety Technical Specifications (2015 Edition)" does not include the evaluation criteria for occlusive patch tests, this embodiment adopts the evaluation criteria for occlusive patch tests in the "Cosmetic Hygiene Specifications (2007 Edition)": if more than 5 out of 30 subjects have a grade 1 adverse skin reaction, or more than 2 out of 30 subjects have a grade 2 adverse skin reaction (more than 5 out of 30 subjects have a grade 2 adverse skin reaction in deodorant patch tests), or if any one subject has a grade 3 or higher adverse skin reaction, the test substance is determined to have an adverse skin reaction on the human body.

[0106] Table 4

[0107]

[0108] As shown in Table 4, after removing the patch, all 34 subjects using the transparent sunscreen gel described in the examples and comparative examples showed negative reactions at three observation time points: 0.5h, 24h, and 48h. This indicates that the present invention is gentle on the skin and has no adverse reactions.

[0109] The applicant declares that this invention illustrates a highly transparent gel-type sunscreen cosmetic and its preparation method through the above embodiments, but this invention is not limited to the above embodiments, that is, it does not mean that this invention must rely on the above embodiments to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of the raw materials of this invention, addition of auxiliary ingredients, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

[0110] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0111] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

Claims

1. A highly transparent gel-type sunscreen cosmetic, characterized in that, The components of the high-transparency gel-type sunscreen cosmetic, by weight percentage, include 0.01%-5% oryzanol, 0.01%-2% walnut oil, 7%-17% organic sunscreen agent, 2%-40% oil phase rheology modifier, and 28.5%-90.99% solvent; The organic sunscreen agent is a combination of isoamyl p-methoxycinnamate, hexyl diethylamino hydroxybenzoyl benzoate, bis-ethylhexyloxyphenol methoxyphenyl triazine, ethylhexyl salicylate and diethylhexylbutamidotriazine ketone in a mass ratio of (3-7):(2-4):(3-5):(2-4):(2-4) in (2-4). The solvent includes any one or a combination of at least two of neopentyl glycol diheptanoate, isopropyl isostearate, or C12-15 alcohol benzoate. The oil phase rheology modifier includes hydrogenated C6-20 polyolefin, HDI / trimethylolhexyl lactone crosspolymer, and caprylic / capric triglyceride.

2. The preparation method of the high-transparency gel-type sunscreen cosmetic according to claim 1, characterized in that, The preparation method includes: (1) Mix the oil-phase rheology modifier, solvent and organic sunscreen agent; (2) Mix the product obtained in step (1) with oryzanol and walnut oil, cool down, and vacuum to obtain the final product.

3. The preparation method of the high-transparency gel-type sunscreen cosmetic according to claim 2, characterized in that, Step (1) is carried out at 90-95℃.

4. The preparation method of the high-transparency gel-type sunscreen cosmetic according to claim 2, characterized in that, The product obtained in step (1) is mixed with oryzanol and walnut oil and carried out at 50-60℃.

5. The preparation method of the high-transparency gel-type sunscreen cosmetic according to claim 2, characterized in that, The vacuuming is performed at 40-50°C.

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