Film-forming composition, application thereof and sunscreen product

Abstract

The invention discloses a film-forming composition, application of the film-forming composition and a sunscreen product. The film-forming composition is prepared from the following components in parts by mass: 0.1 to 1.5 parts of silica-coated polysiloxane-15, 0.1 to 1.5 parts of trimethylsiloxy silicate ester and 0.1 to 1.5 parts of acrylic acid (ester) / polydimethylsiloxane copolymer. According to the composition disclosed by the invention, the silica-coated polysiloxane 15, the trimethylsiloxy silicate ester and the acrylic acid (ester) / polydimethylsiloxane copolymer are compounded, so that a relatively good film forming effect can be achieved by adopting a relatively small dosage of the film forming composition, and the uniformity and integrity of a sun-proof film are improved; while the waterproof performance and the sunscreen capability of the sunscreen product are improved, the sunscreen product has good skin feeling, stability and safety.

Description

Technical Field

[0001] This invention relates to a film-forming composition, its application, and sunscreen products. Background Technology

[0002] Sunscreen products, especially those with high SPF values, are typically used during outdoor activities in summer. The more intense the sunlight and the more outdoor activities, the more sunscreen consumers need to apply. Furthermore, the more intense the sunlight and the higher the outdoor temperature, the more consumers sweat, making it easier for the active ingredients of sunscreen to be washed away by sweat, resulting in a significant decrease in sun protection and requiring frequent reapplication, which is inconvenient. This necessitates that sunscreen products be waterproof and sweatproof, ensuring they maintain a certain level of sun protection even when soaked in sweat or during swimming. Therefore, it is necessary to develop waterproof and sweatproof sunscreens with high SPF values.

[0003] Currently, sunscreen formulations on the market mainly include oil-dispersible, water-in-oil, and oil-in-water types. Water-in-oil formulations, because their outer phase is water, have a relatively refreshing feel on the skin. However, in hot weather or after exercise, sweat or flowing water can cause the water-in-oil sunscreen to migrate, reducing its water resistance. This results in a difficulty in achieving both water resistance and a refreshing feel. Oil-dispersible and water-in-oil formulations use surfactants that are relatively lipophilic, so when applied to the skin, they typically offer good water resistance.

[0004] However, existing oil-dispersed sunscreens are not economical from a system development perspective, while water-in-oil sunscreens have the following problems: 1. They feel oily on the skin and are not comfortable to apply; 2. Their waterproof performance is not stable and long-lasting; 3. When conventional film-forming synergistic compositions are added to the formula, the waterproof improvement effect is generally average, and too many film-forming agents can easily lead to a sticky product formula or even a decrease in stability.

[0005] Ideally, sunscreen products should form a uniform film on the skin's surface, ensuring even distribution of the sunscreen agents. This effectively blocks harmful UV rays and provides the desired sun protection. However, due to the unevenness of the skin's surface and variations in sunscreen formulations, achieving this ideal film-forming effect is difficult in practice. Some sunscreens may accumulate in skin lines while forming a thinner film on raised areas. This leaves raised areas unprotected and more susceptible to sunburn. Summary of the Invention

[0006] The present invention aims to solve the problem of poor film-forming effect of existing sunscreen products, and thus provides a film-forming composition, its application, and a sunscreen product. The composition of the present invention has one or more of the following advantages: (1) Through the composition of a specific composition, a skin-adhering hydrophobic film can be formed on the skin, so that the sunscreen product is evenly and firmly attached to the skin, thereby obtaining good sun protection and water resistance; (2) It prolongs the effective duration of sun protection; (3) It has a relatively refreshing and non-sticky skin feel; (4) It has better gentleness; (5) It has better stability; (6) It achieves better effect with the least amount of additive.

[0007] The present invention solves the above-mentioned technical problems through the following technical solutions:

[0008] The present invention discloses a film-forming composition comprising the following components in parts by weight: 0.1-1.5 parts of silica-encapsulated polysiloxane-15, 0.1-1.5 parts of trimethylsiloxysilicate, and 0.1-1.5 parts of acrylate / polydimethylsiloxane copolymer.

[0009] In this invention, the film-forming composition preferably comprises the following components in parts by weight: 1 part of silica-encapsulated polysiloxane-15, 0.1-15 parts of trimethylsiloxysilicate, and 0.067-8 parts of acrylate / polydimethylsiloxane copolymer.

[0010] The trimethylsiloxane silicate is preferably present in an amount of 0.13-15 parts. The acrylate / polydimethylsiloxane copolymer is preferably present in an amount of 0.067-7.5 parts.

[0011] In this invention, the silica-encapsulated polysiloxane-15 preferably comprises a polysiloxane-15 core and a silica shell covering the polysiloxane-15 core. The silica shell has a porous structure, which can increase light scattering and increase the probability of encountering UV sunscreen agents, while increasing the optical path length and increasing UVA and UVB absorption, thereby improving the SPF value.

[0012] The silica mentioned is the conventional silica listed in the International Catalogue of Cosmetic Ingredients (2021 Edition) (INCI).

[0013] In this invention, the polysiloxane-15, the trimethylsiloxysilicate, and the acrylate / polydimethylsiloxane copolymer are all conventional polysiloxane-15, trimethylsiloxysilicate, and acrylate / polydimethylsiloxane copolymers listed in the International Cosmetic Ingredients Catalogue (2021 edition) (INCI).

[0014] The molecular weight of the polysiloxane-15 is greater than 6000 g / mol.

[0015] Preferably, the silica accounts for 50-80% of the mass of the polysiloxane-15 encapsulated in the silica. Preferably, the polysiloxane-15 accounts for 20-50% of the mass of the polysiloxane-15 encapsulated in the silica.

[0016] In this invention, the silica-encapsulated polysiloxane-15 can be the commercial name CMC HE UV-S15 from CM TECH.

[0017] In this invention, the polysiloxane-15 encapsulated in silica can be 0.1 parts, 0.2 parts, 0.35 parts, or 1.5 parts.

[0018] In this invention, the trimethylsilyloxysilicate can be 0.2 parts, 0.7 parts, or 1.5 parts.

[0019] In this invention, the acrylate / polydimethylsiloxane copolymer may be 0.1 parts, 0.2 parts, 0.35 parts, or 1.5 parts.

[0020] In this invention, the film-forming composition preferably comprises the following components: 0.35 parts of silica-encapsulated polysiloxane-15, 0.7 parts of trimethylsiloxysilicate, and 0.35 parts of acrylate / polydimethylsiloxane copolymer.

[0021] In this invention, the film-forming composition preferably comprises the following components: 0.1 parts of silica-encapsulated polysiloxane-15, 1.5 parts of trimethylsiloxysilicate, and 0.2 parts of acrylate / polydimethylsiloxane copolymer.

[0022] In this invention, the film-forming composition preferably comprises the following components: 0.2 parts of silica-encapsulated polysiloxane-15, 0.2 parts of trimethylsiloxysilicate, and 1.5 parts of acrylate / polydimethylsiloxane copolymer.

[0023] In this invention, the film-forming composition preferably comprises the following components: 1.5 parts of silica-encapsulated polysiloxane-15, 0.2 parts of trimethylsiloxysilicate, and 0.1 parts of acrylate / polydimethylsiloxane copolymer.

[0024] In this invention, the film-forming composition preferably consists of the following components: 0.1-1.5 parts of silica-encapsulated polysiloxane-15, 0.1-1.5 parts of trimethylsiloxysilicate, and 0.1-1.5 parts of acrylate / polydimethylsiloxane copolymer.

[0025] The film-forming composition preferably comprises the following components: 0.35 parts of silica-encapsulated polysiloxane-15, 0.7 parts of trimethylsiloxysilicate, and 0.35 parts of acrylate / polydimethylsiloxane copolymer.

[0026] Preferably, the film-forming composition comprises the following components: 0.1 parts of silica-encapsulated polysiloxane-15, 1.5 parts of trimethylsiloxysilicate, and 0.2 parts of acrylate / polydimethylsiloxane copolymer.

[0027] Preferably, the film-forming composition comprises the following components: 0.2 parts of silica-encapsulated polysiloxane-15, 0.2 parts of trimethylsiloxysilicate, and 1.5 parts of acrylate / polydimethylsiloxane copolymer.

[0028] The film-forming composition preferably comprises the following components: 1.5 parts of silica-encapsulated polysiloxane-15, 0.2 parts of trimethylsiloxysilicate, and 0.1 parts of acrylate / polydimethylsiloxane copolymer.

[0029] In this invention, the trimethylsiloxysilicate is available from CM TECH under the trade name CM-TMS.

[0030] In this invention, the acrylate / polydimethylsiloxane copolymer can be a product of CM TECH, traded under the name CMC KP.

[0031] The present invention also provides an application of the aforementioned composition as a raw material in a skin product; wherein the skin product may be a sunscreen product.

[0032] The present invention also provides a sunscreen product comprising the aforementioned film-forming composition and a cosmetically acceptable carrier.

[0033] In this invention, the cosmetically acceptable carrier is a carrier that is conventionally applicable to cosmetics or personal care products in the art. The cosmetically acceptable carrier may comprise one or more of water-soluble, oil-soluble, water-dispersible, and oil-dispersible substances, which are typically used in compositions and applied to the skin in amounts established in the art. For example, the cosmetically acceptable carrier may include one or more of surfactants, thickeners, emollients, conditioning agents, humectants, chelating agents, preservatives, absorbents, film-forming agents, sunscreens, pH adjusters, and additives. The additives are used to enhance the appearance, feel, or fragrance of the composition, such as colorants and / or fragrances.

[0034] In this invention, the sunscreen product may include the following components in parts by weight:

[0035] Phase A-1: ​​1 part of bis-ethylhexyloxyphenol methoxyphenyl triazine, 3 parts of diethylamino hydroxybenzoyl hexyl benzoate, 9 parts of ethylhexyl methoxycinnamate, 1 part of octyl polymethylsiloxane, 1 part of PEG-10 polydimethylsiloxane, 0.7 parts of cetyl PEG / PPG-10 / 1 polydimethylsiloxane, and 0.1-1.5 parts of silica-encapsulated polysiloxane-15;

[0036] Phase A-2: 25 parts of cyclopentamethoxysiloxane, 4 parts of titanium dioxide, and 4 parts of zinc oxide;

[0037] Phase A-3: 5 parts of cyclopentamethoxysiloxane, 0.1-1.5 parts of trimethylsiloxysilicate, and 0.1-1.5 parts of acrylate / polydimethylsiloxane copolymer;

[0038] Phase B: 2 parts glycerol, 2 parts 1,2-pentanediol, 0.02 parts sodium phytate, 1 part panthenol, 2 parts silica, and the remainder deionized water;

[0039] C phase: 5 parts of cyclopentamethoxysilane, 0.3 parts of distearate dimethylammonium lithium montmorillonite;

[0040] Phase D: 0.2 parts phenoxyethanol, 0.2 parts glyceryl caprylate, and 6 parts ethanol.

[0041] The present invention also discloses a method for preparing the aforementioned sunscreen product, which includes the following steps: mixing the film-forming composition and the cosmetically acceptable carrier to obtain the sunscreen product.

[0042] In this invention, the preparation method may include the following steps: mixing the trimethylsiloxysilicate and the acrylate / polydimethylsiloxane copolymer and adding it to the oil phase of the cosmetic-acceptable carrier, and then adding silica-encapsulated polysiloxane-15.

[0043] Wherein, when the sunscreen product includes the aforementioned A-1 phase, A-2 phase, A-3 phase, B phase, C phase, and D phase, the preparation method of the sunscreen product preferably includes:

[0044] After mixing and dissolving the raw materials in phase A-1 at 70–80°C, the mixture is cooled to room temperature to obtain the first mixture.

[0045] Each raw material in phase A-2, each raw material in phase A-3, and each raw material in phase C are mixed separately until there are no particles. Then, the first mixture is added to each mixture in sequence and stirred for 20-25 minutes to obtain a second mixture.

[0046] At 70-80°C, the raw materials in phase B are mixed and then cooled to 20-30°C to obtain a third mixture. At room temperature, the third mixture is mixed with the second mixture and then added to phase D to obtain a sunscreen product.

[0047] The room temperature is conventional in the art, for example, 20–30°C.

[0048] The positive and progressive effects of this invention are as follows:

[0049] The composition of the present invention, through the compounding of silica-encapsulated polysiloxane-15, trimethylsiloxysilicate, and acrylate / polydimethylsiloxane copolymer, achieves better film-forming effect with a smaller amount of film-forming composition (more film-forming agent will result in a poorer skin feel), improves the uniformity and integrity of sunscreen film formation, and enhances the waterproof performance and sun protection ability of sunscreen products while having good skin feel, stability and safety. Detailed Implementation

[0050] The present invention is further illustrated below by way of embodiments, but the invention is not limited to the scope of the embodiments described herein. Experimental methods in the following embodiments that do not specify specific conditions were performed according to conventional methods and conditions, or as selected according to the product instructions.

[0051] Raw material source description:

[0052]

[0053]

[0054] Example

[0055] The following examples and comparative examples provide sunscreen liquids with different components, and the raw material components are shown in Table 1.

[0056] The only difference between the various embodiments and comparative examples is the amount of trimethylsiloxysilicate, acrylate / polydimethylsiloxane copolymer, silica-encapsulated polysiloxane-15, water-dispersible acrylic copolymer, and polyvinylpyrrolidone.

[0057] The amounts of trimethylsiloxysilicate, acrylate / polydimethylsiloxane copolymer, silica-encapsulated polysiloxane-15, water-dispersible acrylic copolymer, and polyvinylpyrrolidone are shown in Table 2.

[0058] Table 1

[0059]

[0060]

[0061] Table 2 shows the amounts of trimethylsiloxysilicate, acrylate / polydimethylsiloxane copolymer, silica-encapsulated polysiloxane-15, water-dispersible acrylic copolymer, and polyvinylpyrrolidone in different examples and comparative examples.

[0062] Table 2

[0063]

[0064] The preparation methods of the sunscreen liquids in the above embodiments and comparative examples 1-10 are as follows:

[0065] After the A-1 phase raw material is completely dissolved and mixed into a solution in the main pot at 75±5℃, it is cooled to room temperature (25±5℃) and ready for use.

[0066] Pre-disperse phases A-2, A-3, and C separately in a mixer for 10-30 minutes until they are uniform and free of particles. Then pour them into the main pot in sequence and stir for 20 minutes to confirm uniformity.

[0067] At 75±5℃, the B phase raw materials were mixed to form a B phase solution, and then cooled to room temperature (25±5℃) for later use.

[0068] At room temperature (25±5℃), add phase B solution to the main pot and stir for 10 minutes to ensure homogeneity. Finally, add phase D and stir for 5 minutes until homogeneous. Check the state of the contents, remove bubbles, and obtain sunscreen liquid (separately separated upon standing).

[0069] Example 1

[0070] According to the Cosmetic Safety Technical Specifications (2015 Edition), clinical tests showed that the SPF and PFA of sunscreen products with added film-forming enhancement combinations were more than 100% higher than those of other comparative combinations.

[0071] Light source: Xenon arc lamp from a daylight simulator; all performance parameters meet the testing specifications.

[0072] Test method:

[0073] (1) The experiment was conducted in accordance with the specific requirements of the "Cosmetic Safety Technical Specifications" (2015 edition). Subjects were placed in a prone 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 experiment, and the ultraviolet radiation dose was adjusted accordingly for the test sample. On the day of the experiment, a normal skin area of ​​at least 30 cm² was selected on the subject's back. The sample to be tested or the standard control was evenly applied to the area at a sample dosage of (2.00±0.05) mg / cm², and the treatment was allowed to proceed for 15 minutes or as per the label instructions. Then, an appropriate ultraviolet radiation dose was selected, and irradiation was performed under three conditions: ① no sample was applied to the subject's skin; ② the standard control sample was applied; ③ the sample to be tested was applied. The experimental results were observed 24 hours later, and the MED values ​​were recorded under each of the three conditions.

[0074] SPF value calculation method: The SPF value of a sample or standard for protecting a single subject is expressed by the following formula:

[0075]

[0076] Calculate the arithmetic mean of the SPF values ​​of all subjects in the sample protection test, and take the integer part as the SPF value of the sample.

[0077] (2) The experiment was conducted in accordance with the specific requirements of the "Cosmetic Safety Technical Specifications" (2015 edition). Subjects were placed in a prone position, and their backs were irradiated. The minimum sustained melanization factor (MPPD) of the subject's skin to ultraviolet radiation was predicted 24 hours prior to the experiment. The ultraviolet radiation dose was adjusted based on the prediction results for the test sample. On the day of the experiment, a normal skin area of ​​at least 30 cm² was selected on the subject's back. The sample to be tested or the standard control was evenly applied to the area at a sample dosage of (2.00±0.05) mg / cm², and the treatment was allowed to proceed for 15 minutes or as per the label instructions. Then, an appropriate ultraviolet radiation dose was selected, and irradiation was performed under three conditions: ① no sample was applied to the subject's skin; ② the standard control sample was applied; ③ the sample to be tested was applied. The experimental results were observed 2–4 hours later, and the MPPD values ​​were recorded under each of the three conditions. PFA value calculation method: The PFA value of the sample or standard protecting a single subject is expressed by the following formula:

[0078]

[0079] Calculate the arithmetic mean of the PFA values ​​of all subjects in the sample protection test, and take the integer part as the PFA value of the sample.

[0080] The test results for each embodiment and comparative example are shown in Table 3.

[0081] Table 3

[0082]

[0083]

[0084] Example 2

[0085] According to the Cosmetic Safety Technical Specifications (2015 Edition), clinical tests showed that sunscreens with added film-forming enhancement combinations achieved general water resistance (40-minute water resistance), with a reduction in water resistance of less than 50% after bathing. Compared with other comparative combinations, the water resistance enhancement reached more than 30%, and the SPF of the skin could reach 50+ after bathing.

[0086] Light source: xenon arc lamp from a daylight simulator; ambient temperature: (23±3)℃; relative humidity: 50±10%; water temperature: (30±2)℃. All performance items meet the requirements of the testing specifications.

[0087] Test method:

[0088] (1) The experiment was conducted in accordance with the specific requirements of the "Cosmetic Safety Technical Specifications" (2015 edition). Subjects were placed in a prone 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 experiment, and the ultraviolet radiation dose was adjusted based on the prediction results for use in the test samples. On the day of the experiment, 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 Apply the sample or standard control evenly to the above-mentioned area and wait 15 minutes or as per the label instructions. The subject should engage in moderate activity or moderate swirling in the water for 20 minutes. After exiting the water, rest for 20 minutes (do not rub the test area with a towel). Then, re-enter the water for another 20 minutes of moderate activity. After finishing water activities, allow the skin to dry (do not rub the test area with a towel).

[0089] Select an appropriate UV irradiation dose and administer irradiation under three conditions: a. No test substance applied to the subject's skin; b. Control substance applied; c. Test substance applied, followed by water bath and irradiation. Observe the experimental results after 16-24 hours. SPF value calculation method: The SPF value of the sample or standard for protecting a single subject is expressed by the following formula:

[0090]

[0091] Calculate the arithmetic mean of the SPF values ​​of all subjects using the sample protection method, and take the integer part as the result of the test.

[0092] Determine the SPF value of the sample.

[0093] If the value measured after 40 minutes of bathing decreases by no more than 50%, it is considered to have general water resistance.

[0094] The test results for each embodiment and comparative example are shown in Table 4.

[0095] Table 4

[0096]

[0097] Example 3: Safety and stability test of the patch

[0098] (1) Human skin patch test

[0099] Test method: A closed patch test was conducted on 30 Asian adult subjects aged 18-60 years, and the skin reaction was observed.

[0100] Testing was conducted in accordance with the Cosmetic Safety Technical Specifications (2015 Edition).

[0101] Test environment: Temperature: 21±1℃, Relative humidity: 50±10%;

[0102] Instructions for use: Place 22mg of the product into the plaster applicator. Apply the plaster applicator containing the test substance to the flexor side of the subject's forearm using non-irritating adhesive tape, and gently press with the palm of your hand to ensure even adhesion to the skin. Leave on for 24 hours. Observe skin reactions according to the skin adverse reaction grading standard (Cosmetic Safety Technical Specification, 2015 edition) at 30 minutes (after the indentation disappears), 24 hours, and 48 hours after removing the plaster applicator to determine whether the product has any adverse reactions on human skin.

[0103] The test results for each embodiment and comparative example are shown in Table 5.

[0104] Table 5

[0105] sample Number of subjects Observation time Patch test with different skin reactions. Example 1 30 30min, 24h, 48h 0 Example 2 30 30min, 24h, 48h 0 Example 3 30 30min, 24h, 48h 0 Example 4 30 30min, 24h, 48h 0 Comparative Example 1 30 30min, 24h, 48h 0 Comparative Example 2 30 30min, 24h, 48h 0 Comparative Example 3 30 30min, 24h, 48h 0 Comparative Example 4 30 30min, 24h, 48h 0 Comparative Example 5 30 30min, 24h, 48h 0 Comparative Example 6 30 30min, 24h, 48h 0 Comparative Example 7 30 30min, 24h, 48h 0 Comparative Example 8 30 30min, 24h, 48h 0 Comparative Example 9 30 30min, 24h, 48h 0 Comparative Example 10 30 30min, 24h, 48h 0 Comparative Example 11 30 30min, 24h, 48h 0

[0106] The results showed that no adverse skin reactions occurred in any of the 30 subjects at 30 min, 24 h and 48 h after removal of the test substance plaque.

[0107] (2) Stability test

[0108] Test basis: Stability test was conducted using a more stringent standard than GB / T 29665-2013, referring to GB / T 29665-2013.

[0109] Test content includes heat resistance, cold resistance, cycling, and centrifugation tests.

[0110] The heat resistance test conditions were: 40±1℃, 30 days, constant temperature and protection from light;

[0111] The cold resistance test conditions are: -18±2℃, 30 days, constant temperature and protection from light;

[0112] The cyclic test conditions were: alternating hot and cold cycles at 40°C and -18°C for 24 hours for 7 days;

[0113] After the sample is brought back to room temperature for more than 8 hours, observe whether the sunscreen composition is unevenly shaken, or whether there is precipitation of sunscreen agent or powder.

[0114] In the above tests, if the sunscreen composition does not exhibit uneven shaking, sunscreen agent precipitation, or powder precipitation, the stability test is passed; otherwise, the stability test is failed.

[0115] The test results for each embodiment and comparative example are shown in Table 6.

[0116] Table 6

[0117]

[0118]

[0119] Experimental results: Except for Comparative Example 6, all results passed.

[0120] Example 4: Sensory Evaluation of Skin Feel

[0121] Testing Method: Ten volunteers were recruited. They used the sunscreen products from Examples 1-4 and Comparative Examples 1-10 respectively. After application, volunteers' evaluations were collected, and the average score for each item was calculated. 1. Spreadability and shine upon initial application: scored from 1-15 points. Higher scores indicate easier spread and a more matte finish. 2. Oiliness and moisture during application: scored from 1-15 points. Higher scores indicate a lighter and more moisturizing feel. 3. Residue, stickiness, and shine after application: scored from 1-15 points. Higher scores indicate less residue, a drier feel, and less shine. 4. Overall preference, categorized by intensity into five levels: very much liked, generally liked, neither liked nor disliked, generally disliked, and very disliked.

[0122] The results are shown in Table 7 below.

[0123] Table 7

[0124]

[0125]

[0126] It can be seen that, except for Comparative Example 6 which had uneven coating and Comparative Example 11 which had a slightly thicker skin feel, the examples and the other comparative examples all had a good skin feel.

[0127] The above tests show that the film-forming synergistic combination in the embodiments has good sun protection synergistic effect, waterproof synergistic effect, skin feel, stability and safety.

[0128] Comparative Example 1 is a comparative example without any film-forming synergistic ingredients. It can be seen that both the SPF and PFA values ​​are relatively low, and the waterproof data is not ideal. The values ​​measured after 40 minutes of bathing decreased by more than 50%, indicating that it does not have general water resistance.

[0129] Comparative Examples 2 and 3, based on Comparative Example 1, added silica-encapsulated polysiloxane-15 and acrylate / polydimethylsiloxane copolymer, respectively, which enhanced the sun protection and water resistance to some extent. However, the SPF and PFA values ​​before and after bathing did not reach 50+ PA++++.

[0130] Comparative Example 4 added silica-encapsulated polysiloxane-15 and acrylate / polydimethylsiloxane copolymer to Comparative Example 1, but the test results showed that it still did not achieve the expected high sun protection value (SPF50+ PA++++ before bathing).

[0131] Comparative Example 5 increased the content compared to Comparative Example 4, but the film formation was still not very complete and uniform.

[0132] Comparative Examples 6 and 7, based on Comparative Example 4, used two water-dispersible / water-soluble film-forming agents: a water-dispersible acrylic copolymer and a polyvinylpyrrolidone derivative. The results showed that Comparative Examples 6 and 7 did not further improve upon Comparative Example 4; in fact, their waterproofing effect and stability were worse, with waterproofing even lower than Comparative Example 1. Furthermore, the inconsistent distribution of the aqueous phase within the water-in-oil system may have resulted in poor overall product dispersion, leading to colored spots and uneven mixing.

[0133] The results of Comparative Example 8 and Example 1 clearly show that the sun protection and waterproofing enhancement effects of the hard film component trimethylsiloxysilicate alone are average. However, when used in combination with silica-encapsulated polysiloxane-15 and acrylate / polydimethylsiloxane copolymer, a synergistic effect is achieved, with SPF and PFA enhancements exceeding 100%. The post-bath SPF value also reaches 50+, and the waterproofing enhancement exceeds 30% with no negative impact on skin feel.

[0134] Comparative Examples 9 and 10 show that the absence of any one of the following components—silica-encapsulated polysiloxane-15, trimethylsiloxysilicate, or acrylate / polydimethylsiloxane copolymer—results in poor sun protection and water resistance enhancement. The three components—trimethylsiloxysilicate, silica-encapsulated polysiloxane-15, and acrylate / polydimethylsiloxane copolymer—complement each other, maximizing their respective advantages and ensuring the uniformity and integrity of the sunscreen film.

[0135] A comparison of Comparative Example 11 and Example 1 shows that even with equal substitutions, using an acrylate / polytrimethylsiloxane methacrylate copolymer with a similar acrylate / polydimethylsiloxane structure cannot achieve the expected enhanced sun protection and water resistance. This further demonstrates that the silica-encapsulated polysiloxane-15, trimethylsiloxysilicate, and acrylate / polydimethylsiloxane copolymer work synergistically.

Claims

1. A film-forming composition, characterized by, It comprises the following components in mass parts: silica-coated polysilicone-15 0.1-1.5 parts, trimethylsiloxysilicate 0.1-1.5 parts, acrylate / polydimethylsiloxane copolymer 0.1-1.5 parts.

2. The film-forming composition of claim 1, wherein The film-forming composition consists of the following components: silica-coated polysilicone-15 0.1-1.5 parts, trimethylsiloxysilicate 0.1-1.5 parts, acrylate / polydimethylsiloxane copolymer 0.1-1.5 parts.

3. The film-forming composition of claim 1, wherein The film-forming composition comprises the following components in mass parts: silica-coated polysilicone-15 1 part, trimethylsiloxysilicate 0.1-15 parts, acrylate / polydimethylsiloxane copolymer 0.067-8 parts; The trimethylsiloxysilicate is preferably 0.13-15 parts, and the acrylate / polydimethylsiloxane copolymer is preferably 0.067-7.5 parts; And / or, the silica-coated polysilicone-15 comprises a polysilicone-15 core and a silica shell coated on the polysilicone-15 core, and the silica shell is a porous structure; The molecular weight of the polysilicone-15 is preferably greater than 6000 g / mol; The mass of the silica is preferably 50-80% of the mass of the silica-coated polysilicone-15; The mass of the polysilicone-15 is preferably 20-50% of the mass of the silica-coated polysilicone-15.

4. The film-forming composition according to any one of claims 1 to 3, wherein The silica-coated polysilicone-15 is 0.1 part, 0.2 part, 0.35 part, or 1.5 part; And / or, the trimethylsiloxysilicate is 0.2 part, 0.7 part, or 1.5 part; And / or, the acrylate / polydimethylsiloxane copolymer is 0.1 part, 0.2 part, 0.35 part, or 1.5 part.

5. The film-forming composition of claim 1, wherein The film-forming composition comprises the following components: silica-coated polysilicone-15 0.35 parts, trimethylsiloxysilicate 0.7 parts, acrylate / polydimethylsiloxane copolymer 0.35 parts; Or, the film-forming composition comprises the following components: silica-coated polysilicone-15 0.1 part, trimethylsiloxysilicate 1.5 parts, acrylate / polydimethylsiloxane copolymer 0.2 parts; Or, the film-forming composition comprises the following components: silica-coated polysilicone-15 0.2 part, trimethylsiloxysilicate 0.2 part, acrylate / polydimethylsiloxane copolymer 1.5 parts; Or, the film-forming composition comprises the following components: silica-coated polysilicone-15 1.5 parts, trimethylsiloxysilicate 0.2 parts, acrylate / polydimethylsiloxane copolymer 0.1 parts.

6. The film-forming composition according to any one of claims 1 to 3, wherein The trimethylsiloxysilicate is a product with the trade name CM-TMS from CM TECH Co., Ltd.; And / or, the acrylate / polydimethylsiloxane copolymer is a product with the trade name CMCKP from CM TECH Co., Ltd.; and / or the silica-encapsulated polysiloxane-15 is preferably CMC HE UV-S15 from CMTech.

7. Use of a film-forming composition according to any one of claims 1 to 6 as a raw material in a skin product; the skin product can be a sunscreen product.

8. A sunscreen product characterized in that, which comprises a film-forming composition according to any one of claims 1 to 6 and a cosmetically acceptable carrier.

9. The sunscreen product of claim 8, wherein, The cosmetically acceptable carrier comprises any one or more of a surfactant, a thickening agent, an emollient, a conditioning agent, a humectant, a chelating agent, a preservative, an absorbent, a film-forming agent, a sunscreen, a pH adjuster, and an additive.

10. A method of preparing a sunscreen product as claimed in claim 8 or 9, characterised in that, which comprises the steps of: mixing the composition and the cosmetically acceptable carrier to obtain the sunscreen product; The method of preparation preferably comprises the step of mixing the trimethylsiloxysilicate and the acrylates / dimethicone copolymer before adding them to an oil phase in the cosmetically acceptable carrier, and adding the silica-encapsulated polysiloxane-15.

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