Vegetable wax sunscreen synergistic composition as well as application and cosmetics thereof

Abstract

The invention relates to the field of cosmetics, in particular to a vegetable wax sunscreen synergistic composition which is composed of vegetable wax and an emulsifier. The mass ratio of the vegetable wax to the emulsifier is (0.1-1.5): (0.1-2.9); the vegetable wax is one or a combination of two of candelilla wax and synthetic candelilla wax; the emulsifying agent is one or a combination of more of stearyl alcohol polyether-21, C12-20 alkyl glucoside and PEG (Polyethylene Glycol)-100 stearate; according to the plant wax sunscreen synergistic composition provided by the invention, the specific plant wax and the emulsifier are compounded, and the synergistic effect between the plant wax and the emulsifier is utilized, so that the plant wax sunscreen synergistic composition is applied to a sunscreen product, and the sunscreen effect of the sunscreen product can be effectively improved; meanwhile, the invention further discloses application of the plant wax sunscreen synergistic composition and cosmetics containing the plant wax sunscreen synergistic composition.

Description

Technical Field

[0001] This invention relates to the field of cosmetics, specifically to a plant-based wax sunscreen enhancing composition and its uses, and to cosmetics. Background Technology

[0002] Ultraviolet (UV) radiation is a major environmental factor leading to skin photoaging, pigmentation, and even skin cancer. UVB (medium-wave UVB) with a wavelength of 280-320nm easily causes sunburn and erythema, while UVA (long-wave UVA) with a wavelength of 320-400nm has stronger penetrating power, reaching deep into the dermis and causing collagen fiber breakage, reduced elasticity, and leading to wrinkles and photoaging. With increasing public awareness of sun protection, sunscreens that offer high-efficiency protection, safety, gentleness, and a pleasant user experience have become a key focus of cosmetic research and development. Currently, sunscreens on the market are mainly divided into two categories: chemical sunscreens and physical sunscreens. Chemical sunscreens absorb UV rays and convert them into heat energy, offering advantages such as a lightweight feel and good transparency. However, most chemical sunscreens have poor photostability and are prone to degradation under long-term UV exposure, leading to a decrease in sun protection effectiveness. Some ingredients may also irritate the skin, especially posing a risk of sensitization to people with sensitive skin. Physical sunscreens, on the other hand, form a protective film on the skin surface, reflecting and scattering UV rays. Typical ingredients include zinc oxide and titanium dioxide. These types of sunscreens are characterized by high photostability and good safety. However, traditional physical sunscreens have large particle sizes, which can easily form a thick, cloudy feeling on the skin surface. They also feel sticky and have poor spreadability, making it difficult to meet consumers' needs for product usage experience.

[0003] With the increasing demand for sunscreens with high SPF or high UVA protection, adding more UVB and UVA sunscreen agents is the most direct and effective method. However, adding too many sunscreen agents can result in undesirably high viscosity, leading to a heavy feel on the skin and increasing formulation costs. Furthermore, it may cause contact dermatitis and harm the skin. Moreover, the addition of sunscreen agents must strictly adhere to cosmetic safety regulations; excessive addition is prohibited. Sunscreen enhancers are an effective way to address these issues. They are added to sunscreen products with minimal or no increase in the amount of sunscreen agent used, thereby improving the sun protection effect while optimizing the feel and safety.

[0004] Therefore, the technical problem to be solved by the present invention is: how to provide a new, safe and efficient plant wax sunscreen synergistic composition. Summary of the Invention

[0005] To address the aforementioned issues, this invention provides a plant-based wax sunscreen synergistic composition, which, when applied to sunscreen products, can effectively enhance their sun protection efficacy.

[0006] Meanwhile, the present invention also discloses the use of the plant wax sunscreen synergistic composition and cosmetics containing the plant wax sunscreen synergistic composition.

[0007] To achieve this objective, the present invention adopts the following technical solution:

[0008] A plant-based wax sunscreen synergistic composition, characterized in that the composition comprises plant wax and emulsifier; wherein the mass ratio of plant wax to emulsifier is 0.1~1.5:0.1~2.9.

[0009] The plant wax is one or a combination of two of candelilla wax and synthetic candelilla wax; the emulsifier is one or a combination of one of stearyl alcohol polyether-21, C12-20 alkyl glucoside and PEG-100 stearate.

[0010] In the research of this invention, it was found that when the above-mentioned plant waxes are mixed with emulsifiers to obtain a composition, the crystals of the composition become finer as observed under a microscope, thereby increasing the sun protection effect of the product. The possible mechanism is as follows:

[0011] Compared to other high-melting-point plant waxes, candelilla wax exhibits a slower recrystallization process, sometimes requiring several days to return to its maximum hardness. Therefore, its recrystallization size is easily influenced by other components in the system. This invention has discovered that specific high-HLB emulsifiers significantly affect the particle size of candelilla wax recrystallization compared to other emulsifiers. When light enters the system, it is further refracted due to the difference in refractive index between the plant wax crystals and the non-crystalline components. Using the same mass of plant wax, smaller crystals result in a greater number of crystals, providing more interfaces for refraction, leading to more refractions and a longer optical path within the system. Therefore, reducing the crystal size for the same mass increases the opportunity for light to contact the sunscreen, thereby significantly improving the sunscreen's protective efficiency.

[0012] On the other hand, smaller crystals are more flexible, allowing them to spread more evenly on the interface, which can further improve the product's sun protection efficiency.

[0013] Preferably, the emulsifier has an HLB value of 10.3 to 18.8.

[0014] Furthermore, this invention discloses the use of the plant wax sunscreen synergistic composition described above in the preparation of cosmetics.

[0015] Preferably, the cosmetic product is a cosmetic product with sun protection function.

[0016] Finally, the present invention discloses a cosmetic containing 0.2 to 4.4 wt% of the plant wax sunscreen synergistic composition as described above.

[0017] Preferably, the cosmetics include sunscreen, sunscreen lotion, sunscreen stick, sunscreen gel, sunscreen jelly, sunscreen oil, and sunscreen base makeup.

[0018] The beneficial effects of this invention are:

[0019] The plant wax sunscreen synergistic composition provided by this invention uses specific plant waxes and emulsifiers to compound and utilize the synergistic effect between plant waxes and emulsifiers. When applied to sunscreen products, it can effectively increase the sun protection effect of sunscreen products. Attached Figure Description

[0020] Figure 1 Microscopic images of Example 1;

[0021] Figure 2 Microscopic images of Example 2;

[0022] Figure 3 Microscopic images of Example 3;

[0023] Figure 4 Microscopic images of Example 4;

[0024] Figure 5 Microscopic images of Example 5;

[0025] Figure 6 Microscopic images of Example 6;

[0026] Figure 7 The image shown is a microscope image of Comparative Example 1.

[0027] Figure 8 The image shown is a microscope image of Comparative Example 2.

[0028] Figure 9 This is a microscope image of Comparative Example 3;

[0029] Figure 10 This is a microscope image of Comparative Example 4;

[0030] Figure 11 This is a microscope image of Comparative Example 5;

[0031] Figure 12 The image shown is a microscope image of Comparative Example 6.

[0032] Figure 13 This is a microscope image of Comparative Example 7;

[0033] Figure 14 This is a microscope image of Comparative Example 8;

[0034] Figure 15 The image shown is a microscope image of Comparative Example 9;

[0035] Figure 16 The image shown is a microscope image for Comparative Example 10.

[0036] Figure 17 The image shown is a microscope image of Comparative Example 11.

[0037] Figure 18 This is a graph showing the SPF value test results for Example 1;

[0038] Figure 19 This is a graph showing the SPF value test results for Example 2;

[0039] Figure 20 This is a graph showing the SPF value test results for Example 3;

[0040] Figure 21 This is a graph showing the SPF value test results for Example 4;

[0041] Figure 22 This is a graph showing the SPF value test results for Example 5;

[0042] Figure 23 This is a graph showing the SPF value test results for Example 6;

[0043] Figure 24 The SPF value test chart is for Comparative Example 1;

[0044] Figure 25 This is a graph showing the SPF value test results for Comparative Example 2.

[0045] Figure 26 The SPF value test chart is for Comparative Example 3;

[0046] Figure 27 This is a graph showing the SPF value test results for Comparative Example 4.

[0047] Figure 28 The SPF value test chart is for Comparative Example 5;

[0048] Figure 29 This is a graph showing the SPF value test results for Comparative Example 6;

[0049] Figure 30 This is a graph showing the SPF value test results for Comparative Example 7;

[0050] Figure 31 The SPF value test chart is for Comparative Example 8;

[0051] Figure 32 This is a graph showing the SPF value test results for Comparative Example 9;

[0052] Figure 33 The SPF value test chart is for Comparative Example 10;

[0053] Figure 34 This is a graph showing the SPF value test results for Comparative Example 11. Detailed Implementation

[0054] The technical solution of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0055] Raw material source description:

[0056] Candelilla wax: Cerafumei® candelilla wax 5501 (Cerafumei Biotechnology);

[0057] Synthetic candelilla wax: Synfumei® Synthetic Candelilla Wax 6702 (Fumei Biotechnology);

[0058] Stearyl alcohol polyether-21: SP BRIJ S721 MBAL-PA-(SG) (Crod Chemicals (Shanghai) Co., Ltd.), HLB value 15.5;

[0059] C12-20 alkyl glucoside: MONTANOV L (SEPPIC SA), composed of 20 wt% emulsifier C12-20 alkyl glucoside and 80 wt% C14-22 alcohol, with an HLB value of 10.3;

[0060] PEG-100 stearate: TEGO CARE 165 MB (Evonik Goldschmidt GmbH), composed of 50 wt% emulsifier PEG-100 stearate and 50 wt% glyceryl stearate, with an HLB value of 18.8;

[0061] Glyceryl stearate SE: NIKKOL MGS-BSEV (NIPPON SURFACTANT INDUSTRIES CO.,LTD.), HLB value 8;

[0062] PEG-12 polydimethylsiloxane: KF-6017 (SHIN-ETSU chemical CO.,LTD.), HLB value 4.5;

[0063] It should be noted that the technical solution of this application can be achieved by purchasing other commercially available raw materials, and is not limited to the aforementioned raw material suppliers.

[0064] The proportions of the embodiments and comparative examples of the present invention are shown in Table 1.

[0065] Table 1. Formulation Table (parts by weight)

[0066] plant wax Quality emulsifier Quality Example 1 Candelilla wax 1 Stearyl alcohol polyether-21 2 Example 2 Candelilla wax 0.1 Stearyl alcohol polyether-21 2.9 Example 3 Candelilla wax 1.5 Stearyl alcohol polyether-21 0.1 Example 4 Candelilla wax 1 C12-20 alkyl glucoside 2 Example 5 Candelilla wax 1 PEG-100 stearate 2 Example 6 Synthetic candelilla wax 1 C12-20 alkyl glucoside 2 Comparative Example 1 Candelilla wax 3 / / Comparative Example 2 / / Stearyl alcohol polyether-21 3 Comparative Example 3 / / C12-20 alkyl glucoside 3 Comparative Example 4 / / PEG-100 stearate 3 Comparative Example 5 Synthetic candelilla wax 3 / / Comparative Example 6 Wild lacquer fruit wax 1 C12-20 alkyl glucoside 2 Comparative Example 7 Wild lacquer fruit wax 3 / / Comparative Example 8 Candelilla wax 1 PEG-10 polydimethylsiloxane 2 Comparative Example 9 / / PEG-10 polydimethylsiloxane 3 Comparative Example 10 Candelilla wax 1 Glyceryl stearate SE 2 Comparative Example 11 / / Glyceryl stearate SE 3

[0067] The plant wax sunscreen synergistic compositions obtained in each embodiment and comparative example were added to the full formula of the sunscreen lotion to prepare the corresponding sunscreen lotion. The full formula of the sunscreen lotion is shown in Table 2.

[0068] The preparation method of sunscreen lotion is as follows:

[0069] Step 1: Mix the B phase components and heat to above 80°C to ensure complete dissolution of all components;

[0070] Step 2: Add the plant wax sunscreen synergist composition and homogenize for 3 minutes to obtain a homogeneous and complete oil phase;

[0071] Step 3: Slowly add the uniformly dissolved A phase, then homogenize for 3 minutes;

[0072] Step 4: Cool to below 45℃, discharge to obtain sunscreen lotion, and conduct corresponding tests.

[0073] Table 2. Sunscreen Lotion Formula Table

[0074]

[0075] Performance testing

[0076] Security test

[0077] For the sunscreens in Examples 1-3, the "Human Skin Patch Test" method in the "Cosmetic Safety Technical Specifications (2015 Edition)" was used to recruit 10 volunteers to conduct a closed patch test on the skin and score them according to the scoring criteria in Table 3.

[0078] Table 3. Scoring Criteria for Patching Test

[0079] Rating levels Skin reaction 0 negative reaction 1 Suspicious reaction: only slight erythema 2 Weak positive reaction: erythema, infiltration, edema, and papules may be present. 3 Strong positive reaction: erythema, infiltration, edema, papules, vesicles, which may extend beyond the tested area. 4 Extremely positive reaction: obvious erythema, severe infiltration, edema, confluent herpes, extending beyond the test area.

[0080] Grain observation test

[0081] The plant wax sunscreen synergistic compositions of each embodiment and comparative example were completely dissolved and mixed according to the formulation in Table 2, and the crystal size of the compositions was observed under a microscope.

[0082] Sun protection performance

[0083] Referring to ISO 24443:2021, the in vitro sunscreen test method, a PMMA plate conforming to the standard was used to apply 1.3 mg / cm² of sunscreen. 2After the samples were tested, the SPF (Sun Protection Factor) of the corresponding samples (sunscreen lotions corresponding to each example and comparative example) were tested using Labsphere's UV-2000S.

[0084] Test Results

[0085] The results of the patch test are shown in Table 4.

[0086] Table 4. Patch Test Results

[0087]

[0088] Patch results showed that 0 adverse reactions occurred in 10 people who used sunscreen lotions with or without the plant-based wax sunscreen synergist composition, indicating that sunscreen lotions containing this plant-based wax sunscreen synergist composition have lower skin irritation.

[0089] The results of microscope and SPF value tests are shown in Table 5.

[0090] Table 5 SPF Values

[0091] SPF value Microscope Figure Number SPF value corresponds to the attached figure number Example 1 44.08 1 18 Example 2 31.08 2 19 Example 3 45.24 3 20 Example 4 61.32 4 21 Example 5 35.97 5 22 Example 6 44.03 6 23 Comparative Example 1 20.82 7 24 Comparative Example 2 13.13 8 25 Comparative Example 3 32.28 9 26 Comparative Example 4 8.55 10 27 Comparative Example 5 10.98 11 28 Comparative Example 6 20.64 12 29 Comparative Example 7 8.15 13 30 Comparative Example 8 12.29 14 31 Comparative Example 9 11.19 15 32 Comparative Example 10 24.4 16 33 Comparative Example 11 30.91 17 34

[0092] Analysis of the microscopic images reveals that:

[0093] The crystals in Examples 1-3 were compared to those in Comparative Examples 1 and 2 to show that the combination of candelilla wax and stearyl alcohol polyether-21 can make the crystals finer, which may improve the sun protection effect of the composition.

[0094] Comparing the crystals of Example 4, Comparative Example 1 and Comparative Example 3, comparing the crystals of Example 5, Comparative Example 1 and Comparative Example 4, and comparing the crystals of Example 6, Comparative Example 3 and Comparative Example 5, it can be seen that the crystals become finer.

[0095] Comparing the crystals of Comparative Examples 6, 3, and 7, Comparative Examples 8, 1, and 9, and Comparative Examples 10, 1, and 11, no reduction in crystal size was observed. This indicates that not all plant waxes combined with emulsifiers can result in finer crystals; this phenomenon only occurs when the specific plant waxes and emulsifiers described in this invention are combined.

[0096] Analysis of the SPF values ​​for each case leads to the following conclusions:

[0097] Comparing the data of Example 1, Comparative Example 1, and Comparative Example 2, when the composition contains only candelilla wax or stearyl alcohol polyether-21, its SPF value is 20.82 or 13.13. However, Example 1 uses both raw materials in combination while maintaining a consistent total mass, resulting in an SPF value as high as 44.08, which is much higher than that of Comparative Example 1 and Comparative Example 2. This indicates that the combination of candelilla wax and stearyl alcohol polyether-21 in Example 1 has a synergistic effect in improving the SPF value of the composition, thereby enhancing the sun protection effect of the composition.

[0098] Comparing the data from Example 4, Comparative Example 1, and Comparative Example 3; comparing the data from Example 5, Comparative Example 1, and Comparative Example 4; and comparing the data from Example 6, Comparative Example 3, and Comparative Example 5, it is shown that the combined use of candelilla wax and C12-20 alkyl glucoside, candelilla wax and PEG-100 stearate, and synthetic candelilla wax and C12-20 alkyl glucoside also has the effect of synergistically improving the SPF value of the composition.

[0099] Comparing the data of Comparative Example 6, Comparative Example 3, and Comparative Example 7, it can be seen that Comparative Example 6 is simply a superposition of the effects of Comparative Example 3 and Comparative Example 7, indicating that it does not have a synergistic effect. Comparing the data of Comparative Example 8, Comparative Example 1, and Comparative Example 9, and comparing the data of Comparative Example 10, Comparative Example 1, and Comparative Example 11, it is also a simple superposition of the effects.

[0100] In summary, only when the specific plant waxes and emulsifiers in the technical solution of this invention are compounded can the composition synergistically improve the SPF value.

[0101] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. Therefore, the embodiments should be considered in all respects as exemplary and non-limiting, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within the present invention.

Claims

1. A plant-based wax sunscreen synergistic composition, characterized in that, The plant wax sunscreen synergistic composition comprises plant wax and emulsifier; the mass ratio of plant wax to emulsifier is 0.1~1.5:0.1~2.

9. The plant wax is one or a combination of two of candelilla wax and synthetic candelilla wax; the emulsifier is one or a combination of one of stearyl alcohol polyether-21, C12-20 alkyl glucoside and PEG-100 stearate.

2. The plant wax sunscreen synergistic composition according to claim 1, characterized in that, The emulsifier has an HLB value of 10.3 to 18.

8.

3. Use of the plant wax sunscreen synergistic composition as described in any one of claims 1 to 2 in the preparation of cosmetics.

4. The use according to claim 3, characterized in that, The cosmetic mentioned is one with sun protection properties.

5. A cosmetic product, characterized in that, The cosmetic contains 0.2 to 4.4 wt% of the plant wax sunscreen synergistic composition as described in any one of claims 1 to 2.

6. The cosmetic product according to claim 5, characterized in that, The cosmetics include sunscreen, sunscreen lotion, sunscreen stick, sunscreen gel, sunscreen oil, and sunscreen base makeup.

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