A full-physical sunscreen composition with elastic and smooth silkiness and application thereof

Abstract

The application discloses a kind of elastic silk smooth full physical sunscreen composition and its application, the mass composition of efficacy component of full physical sunscreen composition is: HDI / trimethylol hexyl lactone 2-15 parts, physical sunscreen 1-35 parts, water-in-silicon emulsifier 1-6 parts, low viscosity volatile silicon oil 1-30 parts, wherein, the mass ratio of HDI / trimethylol hexyl lactone and physical sunscreen is (1-3):(0.5-7).The application reduces the resistance in the process of coating by reasonably adjusting the ratio of HDI / trimethylol hexyl lactone crosslinking polymer and physical sunscreen, so that the sunscreen product is easier to apply, smoother, and reduces friction. Consumers feel more comfortable, more silk smooth, or more easily when applying sunscreen products.

Description

Technical Field

[0001] This invention relates to a cosmetic, specifically to an elastic, silky, all-physical sunscreen composition and its application. Background Technology

[0002] More and more consumers are using sunscreen products to protect their children outdoors. Because children's skin is thinner and the penetration of organic sunscreens is a concern, most parents tend to choose purely physical or primarily physical sunscreens. Considering children's skin condition, the physical sunscreens used in children's sunscreens mainly consist of titanium dioxide and zinc oxide.

[0003] Physical sunscreens typically use titanium dioxide and zinc oxide to reflect and scatter ultraviolet rays, thus protecting the skin. However, the crystal particles of these physical sunscreens are relatively irregular, and this irregular powder surface can cause consumers to experience some resistance during application. This means that when using sunscreens containing these ingredients, users may feel a friction or resistance, resulting in a dry and sticky feeling on the skin. Moreover, if physical sunscreens are not properly dispersed, they can cause white casts and build-up in gaps.

[0004] With the development and accumulation of technology, people have chosen to improve the performance of powders by encapsulating them. For example, different methods such as using stearic acid and triethoxyoctylsilane to treat the powder surface can reduce powder whiteness by enhancing dispersion and reducing agglomeration. However, excellent dispersion only reduces agglomeration; it cannot solve the problem of using purely physical sunscreens. Therefore, although it can reduce whiteness to some extent, further optimization of the skin feel is not possible after a certain point.

[0005] Therefore, in order to meet people's needs, it is necessary to develop a technology that can change the properties of powders and improve the user experience of a large number of physical sunscreen powders. Summary of the Invention

[0006] The purpose of this invention is to overcome at least one deficiency of the prior art and to provide an elastic, silky, all-physical sunscreen composition and its application.

[0007] The technical solution adopted in this invention is:

[0008] In a first aspect, the present invention provides an elastic and silky all-physical sunscreen composition, wherein the active ingredients are composed of: 2-15 parts of HDI / trimethylolhexyl lactone, 1-35 parts of physical sunscreen agent, 1-6 parts of silicone oil-in-water emulsifier, and 1-30 parts of low-viscosity volatile silicone oil; wherein the mass ratio of HDI / trimethylolhexyl lactone to physical sunscreen agent is (1-3):(0.5-7).

[0009] In some instances, the particle size of the HDI / trimethylolhexyl lactone is 7–15 μm.

[0010] In some instances, the physical sunscreen agents are titanium dioxide and zinc oxide.

[0011] In some instances, the mass ratio of zinc oxide to low-viscosity volatile silicone oil is 1:(0.3–6).

[0012] In some instances, the mass ratio of the silicone oil-in-water emulsifier to the low-viscosity volatile silicone oil is 1:(1-15).

[0013] In some instances, the silicone oil-in-water emulsifier is selected from any one of lauryl polymethylsiloxane copolyol, cetyl PEG / PPG-10 / 1 polydimethylsiloxane, PEG-10 polydimethylsiloxane, PEG / PPG-18 / 18 polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane ethyl polydimethylsiloxane, cyclopentamethoxysiloxane, bis-PEG / PPG-14 / 14 polydimethylsiloxane, and PEG / PPG-12 / 16 polydimethylsiloxane.

[0014] In some instances, the low-viscosity volatile silicone oil is selected from at least one of polydimethylsiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, or dodecylpentasiloxane.

[0015] In some instances, the viscosity of the low-viscosity volatile silicone oil is less than or equal to 8 cst.

[0016] In some instances, the all-physical sunscreen composition also includes antioxidants, fragrances, preservatives, neutralizers, emollients, pH adjusters, free radical scavengers, and deodorants.

[0017] Secondly, the present invention provides an easy-to-apply elastic sunscreen skincare product, wherein the active ingredient is the all-physical sunscreen composition described in the first aspect.

[0018] The beneficial effects of this invention are:

[0019] This invention reduces resistance during application by rationally adjusting the ratio of HDI / trimethylolcaprolactone crosspolymer to physical sunscreen agents, making sunscreen products easier and smoother to apply, reducing friction. Consumers will experience greater comfort, a smoother feel, or greater ease of application when using sunscreen products. Detailed Implementation

[0020] The inventors discovered that adjusting the ratio of HDI / trimethylolcaprolactone crosspolymer powder with appropriate particle size to physical sunscreens (such as zinc oxide) can effectively improve the application performance of the sunscreen product and enhance user comfort.

[0021] When an appropriate amount of HDI / trimethylolcaprolactone crosspolymer powder is added, these particles can encapsulate and modify zinc oxide particles, making the zinc oxide particle size more uniform. This effectively reduces the friction of zinc oxide particles on the skin when applying sunscreen, resulting in a smoother application, less irritation, and reduced whitening.

[0022] Furthermore, by adjusting the ratio of HDI / trimethylolcaprolactone crosspolymer in powder form to zinc oxide, the viscosity of sunscreen products can be controlled, making them more spreadable. When the ratio of these two ingredients is appropriate, the sunscreen product will be easier to apply evenly, without feeling difficult to apply or overly greasy after application.

[0023] Therefore, rationally adjusting the ratio of powdered HDI / trimethylolcaprolactone crosslinking polymer to physical sunscreen agents can not only improve the sun protection effect of sunscreen products, but also reduce friction, making the application process more comfortable and smooth, and reducing whiteness. Consumers will feel more comfortable and silky when using such sunscreen products, and they will find it easier to apply evenly. The following disclosure provides many different embodiments or examples for implementing different schemes of the present invention.

[0024] The HDI / trimethylolcaprolactone crosslinker is added to the cosmetic composition in solid form. The term "HDI / trimethylolcaprolactone crosslinker" refers to a filler composed of a material at least partially of the polyurethane type. According to one embodiment of the invention, the polyurethane material may advantageously be in a crosslinked form. According to one embodiment of the invention, the polyurethane powder may generally be substantially spherical. The term "spherical" means substantially spherical in shape, particularly in bead form, preferably having a number-average size of 1 to 20 μm, including 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, and 19 μm, and subranges and values ​​between said values. The preferred term "number-average size" of the invention refers to the size provided by a random particle size distribution reaching half the population size, referred to as D50. Preferred sizes of the invention are 2-18 μm, particularly preferably 7-15 μm. For example, the polyurethane powder may comprise a copolymer. The copolymer may include trimethylolcaprolactone, particularly a hexamethylene diisocyanate (HDI) / trimethylolcaprolactone crosslinked polymer. Examples of copolymers include polyurethane powders sold by Toshiki Corporation under the names Plastic Powder D-400 or Plastic Powder D-800, or by Shiki Corporation under the name Plastic Powder CS-400. Most preferably, polyurethane powders sold by Kechuang Materials Technology Co., Ltd. under the names COTRUNE P600, COTRUNE P610, and COTRUNE P600W, as polyurethane powders, the compositions according to the invention contain a hexamethylene diisocyanate (HDI) / trimethylolcaprolactone crosslinked polymer, such as COTRUNE P600W. The polyurethanes used in the present invention are preferably linear molecules, but may also be branched. The number-average molecular weight of the polyurethanes used in the present invention is, for example, about 50,000-2,000,000, preferably 1,200,000 to 1,500,000.

[0025] The sunscreen filter of this invention is a physical sunscreen. The term "physical sunscreen" generally refers to one or a mixture of titanium dioxide particles and zinc oxide particles of a certain particle size. Zinc oxide is produced using three methods: the indirect method using zinc ingots as raw materials, the direct method using zinc ore as raw materials, and the wet method, resulting in zinc oxide with different particle sizes. These range from 20 nanometers to 100 nanometers, 100 nanometers to 900 nanometers, and 900 nanometers to 10 micrometers. Zinc oxide with a particle size of 150 nanometers to 300 nanometers is preferred. Zinc oxide is an inorganic white pigment. Its tinting strength is less than that of titanium dioxide and lithopone. It is widely used for coloring foundations and sunscreens. Furthermore, nano-zinc oxide is a stable compound that provides broad-spectrum ultraviolet protection (UVA and UVB), while also possessing antibacterial and anti-inflammatory properties. It is consistently ranked as one of the safest and most effective ingredients in sunscreen evaluations across various countries. For inorganic powder physical sunscreens, smaller particle size results in better dispersibility and a finer texture in the final sunscreen product. Particle size also affects the sunscreen mechanism. Taking zinc oxide as an example, its UV protection ability and mechanism are related to its particle size: when the particle size is large, UV blocking is mainly through reflection and scattering, effective against both medium and long-wave UV rays. The sunscreen mechanism is simple coverage, belonging to general physical sunscreens, with relatively weak sun protection. As the particle size decreases, light can pass through the surface of titanium dioxide particles. Reflection and scattering of long-wave UV rays are not significant, while absorption of medium-wave UV rays is significantly enhanced. Its sunscreen mechanism is UV absorption, primarily absorbing medium-wave UV rays. To facilitate the dispersion of physical sunscreens in the formulation, surface-treated physical sunscreens are selected. This invention preferably uses powders of 150 nm to 300 nm size coated with stearic acid, ZS90S being a suitable option, which can be purchased from Kechuang Materials Co., Ltd.

[0026] "Volatile" refers to any non-aqueous medium that can evaporate within one hour of contact with skin or lips at room temperature and atmospheric pressure. Volatile oils are cosmetic volatile oils that are liquid at room temperature. More specifically, volatile silicone oils have a volatility of 0.01 mg / cm³. 2 / min and 200mg / cm 2 Evaporation rates between [values] / min, including limits. Low-viscosity volatile silicone oils are preferred. Usable volatile oils include volatile silicones, such as volatile linear or cyclic silicone oils, especially those with a viscosity ≤ 8 centistokes (cSt) (8 × 10⁻⁶ m³ / min). 2 Silicone oils containing 2 to 10 silicon atoms, particularly 2 to 7 silicon atoms, wherein the silicones may optionally include alkyl or alkoxy groups containing 1 to 10 carbon atoms.

[0027] As volatile silicone oils that can be used in this invention, polydimethylsiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, heptamethylhexyltrisiloxane, heptamethyloctyltrisiloxane, hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, and dodecylpentasiloxane and mixtures thereof with viscosities of 5 cSt and 6 cSt are particularly mentioned. Cyclopentapolydimethylsiloxane is preferred in this invention.

[0028] Examples of water-in-silicone emulsifiers include, but are not limited to, alkyl polydimethylsiloxane coethers, such as lauryl polymethylsiloxane copolyols sold by Dow Corning under the name Dow Corning 5200 Formulation Aid, cetyl PEG / PPG-10 / 1 polydimethylsiloxane sold by Evonik under the name Abil EM 90, or mixtures of polyglycerol-4 isostearate / cetyl PEG / PPG-10 / 1 polydimethylsiloxane / hexyl laurate sold by Evonik under the name Abil WE 09. Other examples include PEG-10 polydimethylsiloxane, PEG / PPG-18 / 18 polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane ethyl polydimethylsiloxane, cetyl PEG / PPG-10 / 1 polydimethylsiloxane, cyclopentamethoxysiloxane, bis-PEG / PPG-14 / 14 polydimethylsiloxane, and PEG / PPG-12 / 16 polydimethylsiloxane, all sold by Shin-Etsu Chemical Co., Ltd. under the product name KF-6017. KF-6017 is preferred in this invention.

[0029] Additional common cosmetic ingredients:

[0030] The compositions according to the invention may also contain any conventional cosmetic ingredients, particularly selected from antioxidants, fragrances, preservatives, neutralizers, surfactants, solar filters, vitamins, moisturizers, self-tanning compounds, anti-wrinkle active ingredients, emollients, hydrophilic or lipophilic active ingredients, free radical scavengers, deodorants, multivalent chelating agents, and mixtures thereof.

[0031] All percentages in this invention are by weight and are based on 100% by weight of the cosmetic composition of this invention, unless otherwise stated.

[0032] All weights referred to in this invention are the weights of the effective substance. For substances in dispersion form, the weights referred to in this invention are the actual weights of the substance, excluding the weight of the carrier. That is, the weight of the substance in dispersion form as referred to in this invention = weight of the dispersion × content of solid components in the dispersion. For solid substances containing water of crystallization, the weights referred to in this invention are the weights after removing the water of crystallization.

[0033] Some of the raw materials and reagents are shown in Table 1:

[0034] Table 1

[0035] Trade Name Description LEXGARD H INCI Name 1,2-Hexanediol. Available from Intergard Chemicals, Inc. GM-0800 INCI Name Poly(methyl methacrylate), average particle size 8 μm. Available from Akzo Nobel Chemicals, Inc. SI-045 INCI Name Polymethylsilsesquioxane, average particle size 4 μm. Available from Akzo Nobel Chemicals, Inc. GPA-1000 INCI Name Nylon-12, average particle size 10 μm. Available from Akzo Nobel Chemicals, Inc. KF-6017 INCI Name PEG-10 Dimethicone. Available from Shin-Etsu Chemical Co., Ltd. COTRUNE P600W (hereinafter P600W) INCI Name HDI / trimethylhexyl lactone, bis-aminopropyl dimethicone, average particle size 7-15 μm. Available from Guangzhou COTRUNE Materials Technology Co., Ltd. P590 INCI Name HDI / trimethylhexyl lactone, bis-aminopropyl dimethicone, average particle size 2 μm. Test sample provided by Guangzhou COTRUNE Materials Technology Co., Ltd. P591 INCI Name HDI / trimethylhexyl lactone, bis-aminopropyl dimethicone, average particle size 25 μm. Test sample provided by Guangzhou COTRUNE Materials Technology Co., Ltd. SZ90S INCI Name Zinc oxide, silica, alumina, stearic acid. Available from Guangzhou COTRUNE Materials Technology Co., Ltd. VCG38 INCI Name Disteardimonium hectorite. Available from Azurée International Trading (Shanghai) Co., Ltd. DC200 INCI Name Dimethicone. Available from Dow Corning. F995 INCI Name Cyclopentasiloxane. Available from Shin-Etsu Chemical Co., Ltd.

[0036] The preparation method includes mixing and homogenizing all raw materials. For ease of comparison, the common components in each example and comparative example are shown in Table 2. The amount of each component added is in parts by mass. NaCl is added in appropriate amount as an osmotic pressure regulator, cyclopentamethoxysiloxane is added as a low-viscosity volatile silicone oil, PEG-10 polydimethylsiloxane is added as a silicone oil-in-water emulsifier, and water is added to 100 parts.

[0037] Table 2

[0038] Trade Name Amount 1,2-Hexanediol Lexgrad H Glycerin 0.5 Glycerin 1,3-Butylene glycol 1 1,3-Butylene glycol Sodium chloride 5 Sodium chloride PEG-10 Dimethicone 1.0 KF-6017 Disteardimonium hectorite 2.2 VCG38 Cyclopentasiloxane 0.65 DC200 F995 10

[0039] The differences in components among the different examples are shown in Table 3. Note that all powders in Table 3 of this invention, except for P600W, are added to the oil phase of the formulation, while P600W needs to be dispersed in the aqueous phase to participate in the emulsification of the formulation.

[0040] Table 3

[0041] SZ90S GM0800 SI-045 GPA-1000 P600W Comparative Example 1 Comparative Example 2 8 1 Comparative Example 3 12 9 Comparative Example 4 16 17 Comparative Example 5 20 25 Comparative Example 6 24 33 Comparative Example 7 8 1 3 Comparative Example 8 12 9 3 Comparative Example 9 16 17 3 Comparative Example 10 20 25 3 Comparative Example 11 24 33 3 Comparative Example 12 8 1 8 Comparative Example 13 12 9 8 Comparative Example 14 16 17 8 Comparative Example 15 20 25 8 Comparative Example 16 24 33 8 Comparative Example 17 8 1 13 Comparative Example 18 12 9 13 Comparative Example 19 16 17 13 Comparative Example 20 20 25 13 Comparative Example 21 24 33 13 Comparative Example 22 8 1 3 Comparative Example 23 12 9 3 Comparative Example 24 16 17 3 Comparative Example 25 20 25 3 Comparative Example 26 24 33 3 Comparative Example 27 8 1 8 Comparative Example 28 12 9 8 Comparative Example 29 16 17 8 Comparative Example 30 20 25 8 Comparative Example 31 24 33 8 Comparative Example 32 8 1 13 Comparative Example 33 12 9 13 Comparative Example 34 16 17 13 Comparative Example 35 20 25 13 Comparative Example 36 24 33 13 Comparative Example 37 8 1 3 Comparative Example 38 12 9 3 Comparative Example 39 16 17 3 Comparative Example 40 20 25 3 Comparative Example 41 24 33 3 Comparative Example 42 8 1 8 Comparative Example 43 12 9 8 Comparative Example 44 16 17 8 Comparative Example 45 20 25 8 Comparative Example 46 24 33 8 Comparative Example 47 8 1 13 Comparative Example 48 12 9 13 Comparative Example 49 16 17 13 Comparative Example 50 20 25 13 Comparative Example 51 24 33 13 Comparative Example 52 20 25 3 Comparative Example 53 24 33 3 Comparative Example 54 8 1 8 Example 1 8 1 13 Example 2 8 1 3 Example 3 12 9 3 Example 4 16 17 3 ​ 12 9 8 Example 5 16 17 8 Example 6 20 25 8 Example 7 24 33 8 Example 8 12 9 13 Example 9 16 17 13 Example 10 20 25 13 Example 11 24 33 13

[0042] Evaluation Experiment 1: Powder Particle Size and Performance Testing

[0043] Polymer powders of different particle sizes were selected and applied to leather for coating tests. The powders were dispersed in the volatile silicone oil of this invention, and the volatile silicone oil was gradually added dropwise until the powders became a non-oily viscous liquid. The powder amount was controlled at 0.2g and applied to a 3*3cm dark leather surface. The changes in the leather texture were observed to observe the performance of powders of different particle sizes on the surface and to observe the powder coating performance of the volatile silicone oil of this invention. The clarity of the leather texture (10 points for no coating and 1 point for no visible texture) and the powder accumulation (0 points for no coating and 10 points for the texture appearing white after complete washing) were observed. The results are shown in Table 4 below:

[0044] Table 4

[0045] Particle size μm Texture clarity Powder accumulation GM0800 8 7 3.5 SI-045 4 7.5 3 GPA-1000 10 6.5 3.5 P600W 7-15 6.5 3 P590 2 9.5 2 P591 25 5.5 8

[0046] Tests revealed that the clarity of the texture is directly related to the particle size. Larger particle sizes result in lower texture clarity. For example, P590 particles with a diameter of <3μm cannot effectively reduce the clarity. However, one cannot simply increase the particle size. For example, P591 particles with a diameter of >20μm can further reduce the clarity of the texture, but excessively large particle sizes will cause a large amount of powder to accumulate in the texture, resulting in a whitening effect. Therefore, the polymer powder particle size range recommended in the following experiments is selected within the range of 3-20μm.

[0047] Evaluation Experiment 2: Powder Elasticity Test

[0048] A fixed weight of 100g of polymer powder and physical sunscreen agent was weighed into a metal container with a bottom diameter of 10cm, mixed evenly in a 1:4 ratio using a powder mixer. A circular rod, just deep enough to reach the container, was gradually pressed down. The point at which the pressure suddenly increases was recorded. The height of the powder at this point was recorded, and then the mixture was compressed to 90% of its original height, with the corresponding stress recorded. Higher stress values ​​indicate a harder powder mixture, and vice versa. The results for the polymer powder selected according to this invention are shown in Table 4 below.

[0049] Table 5

[0050] Inflection point stress 90% high stress GM0800 158N 173N SI-045 8N 11N GPA-1000 112N 122N P600W 74N 82N

[0051] Table 4 shows that the powder with added polymethylsilsesquioxane is the softest, followed by HDI / trimethylolpropionic acid hexyl lactone, while the corresponding polymethyl methacrylate is the hardest.

[0052] When applying a product by hand, the compressive stress on the powder is approximately 100N. At this stress, polymethylsilsesquioxane is too soft and deforms severely, resulting in a highly irregular shape that makes it difficult to achieve an elastic feel during application. Nylon-12 or polymethyl methacrylate, on the other hand, maintains a relatively spherical powder shape, providing a rolling sensation but lacking elasticity. Therefore, the HDI / trimethylolpropionic acid lactone selected in this invention possesses excellent elasticity.

[0053] Evaluation Experiment 3: Using Sensory Testing

[0054] For the "sensory evaluation" experiment, a standardized skin washing procedure was first performed. Skin softened in water for 15 minutes was then washed for 2 minutes with a 12 wt% sodium lauryl sulfate solution, thoroughly rinsed with warm water, and dried on a cool setting. A test area was demarcated, selecting a 3cm x 3cm area on the smooth inner arm for testing. 0.3g of the sample was applied evenly to the skin, and the formula was evaluated based on four dimensions: ease of application, lightness, silkiness, and elasticity. The average score from two sensory evaluation experts was used; a higher score indicated better performance in that area. The evaluations were grouped according to different zinc oxide contents, as shown in Tables 6-10.

[0055] Table 6 (Zinc oxide content is 1%)

[0056] Easy to apply Whiteness silky smooth elasticity Comparative Example 1 9 3.5 4 2.5 Comparative Example 6 9 2.75 5.5 3 Comparative Example 11 8.75 3 5.75 3.25 Comparative Example 16 8.5 3.25 6 3.75 Comparative Example 21 8.5 2.5 4.75 4.5 Comparative Example 26 8.25 2.75 5 5 Comparative Example 31 8 3 5.25 5.25 Comparative Example 36 9 2.75 5.75 5.5 Comparative Example 41 8.75 3 6.25 6 Comparative Example 46 8.5 3.25 6 6.25 Comparative Example 53 9 2.75 7.25 7.25 Comparative Example 54 8.75 3.25 7 7.5 Example 1 9.5 2.25 7.5 7

[0057] This group has a low zinc oxide content, so the spreadability is relatively good, and the whiteness is also low, so the differences are not significant. However, for such a system, the addition of GM0800 (Comparative Examples 6, 11, 16) will increase the whiteness with increasing dosage. Although adding a large amount can improve the silkiness and elasticity, the whiteness and spreadability will decrease. Similarly, SI-045 (Comparative Examples 21, 26, 31) has better silkiness and elasticity than PMMA powder, but because the powder is softer, the spreadability is worse. GPA-1000 (Comparative Examples 36, 41, 46) is even better, with good silkiness and elasticity, but higher whiteness than SI-045. P600W has the best effect, but the effect is best when the mass ratio of HDI / trimethylolpropionate to physical sunscreen is in the range of (1-3):(0.5-7), for example (Example 1). Outside the range, although the results are good, there will still be some loss in terms of spreadability and whiteness.

[0058] Table 7 (Zinc oxide content is 9%)

[0059] Easy to apply Whiteness silky smooth elasticity Comparative Example 2 7.5 6.5 3 1.5 Comparative Example 7 8 6 4.75 2.5 Comparative Example 12 7.75 5.75 5 2.75 Comparative Example 17 7.5 5.25 5.25 3.25 Comparative Example 22 7.5 5.5 4 4 Comparative Example 27 7.25 5.75 4.25 4.5 Comparative Example 32 7 6 4.5 4.75 Comparative Example 37 8 5.25 5 5 Comparative Example 42 7.75 5.5 5.5 5.5 Comparative Example 47 7.5 5.75 5.25 5.75 Example 2 8.25 4.75 7.5 7.5 Example 4 8.75 4.25 7.25 7.75 Example 8 8.5 4.5 7.75 7.25

[0060] This group had a zinc oxide content of 9% and a significant improvement in whiteness. However, for such a system, the addition of GM0800 (Comparative Examples 7, 12, 17) resulted in decreased whiteness with increasing dosage, improved smoothness and slight elasticity, but reduced ease of application. Similarly, SI-045 (Comparative Examples 22, 27, 32) offered better smoothness and elasticity than PMMA powder, but due to its softer texture, it had poorer application and, ironically, better whiteness than the lower physical sunscreen content. GPA-1000 (Comparative Examples 37, 42, 47) performed even better, offering good smoothness and elasticity, with a slight reduction in whiteness. P600W showed the best results, but the optimal ratio of HDI / trimethylolpropionate to physical sunscreen was (1–3):(0.5–7), as in Examples 2, 4, and 8. A significant reduction in whiteness was achieved while maintaining better smoothness and elasticity without sacrificing application.

[0061] Table 8 (Zinc oxide content is 17%)

[0062] Easy to apply Whiteness silky smooth elasticity Comparative Example 3 6.5 7.5 2 1 Comparative Example 8 7 7 4 2 Comparative Example 13 6.75 6.75 4.25 2.25 Comparative Example 18 6.5 6.25 4.5 2.75 Comparative Example 23 6.5 6.5 3.25 3.5 Comparative Example 28 6.25 6.75 3.5 4 Comparative Example 33 6 7 3.75 4.25 Comparative Example 38 7 6.25 4.25 4.5 Comparative Example 43 6.75 6.5 4.75 5 Comparative Example 48 6.5 6.75 4.5 5.25 Example 3 7.25 5.25 7.25 7.25 Example 5 7.75 4.75 7 7.5 Example 9 7.5 5 7.5 7

[0063] This group of zinc oxide contains 17% and has a higher whiteness enhancement. In this system, the addition of GM0800 (Comparative Examples 8, 13, 18) reduces whiteness with increasing dosage, improves silkiness and slightly enhances elasticity, but reduces spreadability. Similarly, SI-045 (Comparative Examples 23, 28, 33) has better whiteness, silkiness, and elasticity than PMMA powder, but due to its softer texture, it has poorer spreadability. GPA-1000 (Comparative Examples 38, 43, 48) performs even better, with good silkiness and elasticity, and a slight reduction in whiteness. P600W is the most effective, but the best results are achieved when the mass ratio of HDI / trimethylolpropionate to physical sunscreen is within the range of (1–3):(0.5–7), for example (Examples 3, 5, 9). A significant reduction in whiteness is achieved while maintaining better silkiness and elasticity without sacrificing spreadability.

[0064] Table 9 (Zinc oxide content is 25%)

[0065] Easy to apply Whiteness silky smooth elasticity Comparative Example 4 5.5 8.5 1.25 0.5 Comparative Example 9 6 8 3.25 1.5 Comparative Example 14 5.75 7.75 3.5 1.75 Comparative Example 19 5.5 7.25 3.75 2.25 Comparative Example 24 5.5 7.5 2.5 3 Comparative Example 29 5.25 7.75 2.75 3.5 Comparative Example 34 5 8 3 3.75 Comparative Example 39 6 7.25 3.5 4 Comparative Example 44 5.75 7.5 4 4.5 Comparative Example 49 5.5 7.75 3.75 4.75 Comparative Example 51 5.75 7 5.25 5 Example 6 7 5.25 6.75 7.25 Example 10 6.75 5.5 7.25 6.75

[0066] This group of zinc oxide contains 25% and has further increased whiteness. With the addition of GM0800 (Comparative Examples 9, 14, 19), the whiteness decreases with increasing dosage, improving smoothness and slightly increasing elasticity, but reducing ease of application. Similarly, SI-045 (Comparative Examples 23, 28, 33) has better whiteness, smoothness, and elasticity than PMMA powder, but due to its softer texture, it has poorer application. GPA-1000 (Comparative Examples 38, 43, 48) performs even better, with good smoothness and elasticity and reduced whiteness. However, starting with this high content of physical sunscreen, the improvement in elasticity and smoothness of these three powders becomes very limited and they no longer provide significant benefits. P600W is the most effective, but the best results are achieved when the mass ratio of HDI / trimethylolpropionate to physical sunscreen is within the range of (1–3):(0.5–7), for example (Examples 6, 10). It significantly reduces whiteness while maintaining better silkiness and elasticity without sacrificing spreadability. However, there are cases where the amount added is too small or outside the recommended proportion, which may prevent it from effectively improving spreadability and elasticity, and also prevent it from significantly reducing whiteness.

[0067] Table 10 (Zinc oxide content is 33%)

[0068] Easy to apply Whiteness silky smooth elasticity Comparative Example 5 4.5 9.5 0.5 0 Comparative Example 10 5.25 8.75 2.75 1 Comparative Example 15 5 8.5 3 1.25 Comparative Example 20 4.75 8 3.25 1.75 Comparative Example 25 4.75 8.25 2 2.5 Comparative Example 30 4.5 8.5 2.25 3 Comparative Example 35 4.25 8.75 2.5 3.25 Comparative Example 40 5.25 8 3 3.5 Comparative Example 45 5 8.25 3.5 4 Comparative Example 50 4.75 8.5 3.25 4.25 Comparative Example 52 5.5 7.75 4.5 4.5 Example 7 6.5 5.75 6.25 7 Example 11 6.25 6 6.5 6.5

[0069] This group of zinc oxide contains 33% and has the highest whiteness. Adding GM0800 (comparative examples 10, 15, 20), SI-045 (comparative examples 23, 28, 33), and GPA-1000 (comparative examples 38, 43, 48) to this system did not effectively improve the silky feel and elasticity, and it was difficult to suppress the whiteness. Only GPA-1000 slightly improved the spreadability. Using P600W yielded the best results, but the best effect was achieved when the mass ratio of HDI / trimethylolpropionate to physical sunscreen was within the range of (1-3):(0.5-7), for example (Examples 7, 11). It significantly reduced whiteness while maintaining better silky feel and elasticity without sacrificing spreadability. However, there were cases where the amount added was too small and outside the ratio range, which failed to effectively improve spreadability and elasticity, and also failed to significantly suppress whiteness.

[0070] In summary, when the mass ratio of HDI / trimethylolhexyl lactone to physical sunscreen is (1-3):(0.5-7), the mass ratio of silicone oil-in-water emulsifier to low-viscosity volatile silicone oil is 1:(1-15), and the mass ratio of zinc oxide to low-viscosity volatile silicone oil is 1:(0.3-6), P600W offers the best skin feel improvement compared to other powders.

[0071] The above is a further detailed description of the present invention and should not be considered as a limitation on the specific implementation of the present invention. For those skilled in the art, simple deductions or substitutions without departing from the concept of the present invention are all within the protection scope of the present invention.

Claims

1. A flexible, silky, all-physical sunscreen composition, characterized in that, Its active ingredient composition is as follows: 2-15 parts HDI / trimethylolhexyl lactone, 1-35 parts physical sunscreen, 1-6 parts silicone oil-in-water emulsifier, and 1-30 parts low-viscosity volatile silicone oil. The mass ratio of HDI / trimethylolhexyl lactone to physical sunscreen is (1-3):(0.5-7), the viscosity of the low-viscosity volatile silicone oil is less than or equal to 8 cst, the particle size of HDI / trimethylolhexyl lactone is 7-15 μm, the mass ratio of silicone oil-in-water emulsifier to low-viscosity volatile silicone oil is 1:(1-15), the physical sunscreen is a 150-300 nm powder coated with stearic acid, the physical sunscreen is zinc oxide, and the mass ratio of zinc oxide to low-viscosity volatile silicone oil is 1:(0.3-6).

2. The all-physical sunscreen composition according to claim 1, characterized in that, The silicone oil-in-water emulsifier is selected from any one of lauryl polymethylsiloxane copolyol, cetyl PEG / PPG-10 / 1 polydimethylsiloxane, PEG-10 polydimethylsiloxane, PEG / PPG-18 / 18 polydimethylsiloxane, lauryl PEG-9 polydimethylsiloxane ethyl polydimethylsiloxane, bis-PEG / PPG-14 / 14 polydimethylsiloxane, and PEG / PPG-12 / 16 polydimethylsiloxane.

3. The all-physical sunscreen composition according to claim 1, characterized in that, The low-viscosity volatile silicone oil is selected from at least one of cyclopentasiloxane, polydimethylsiloxane, octamethylcyclotetrasiloxane, decamethylcyclopentasiloxane, dodecylcyclohexasiloxane, heptamethylhexyltrisiloxane, and heptamethyloctyltrisiloxane.

4. The all-physical sunscreen composition according to claim 1, characterized in that, The low-viscosity volatile silicone oil is selected from at least one of hexamethyldisiloxane, octamethyltrisiloxane, decamethyltetrasiloxane, or dodecylpentasiloxane.

5. The all-physical sunscreen composition according to claim 1, characterized in that, The all-physical sunscreen composition also includes antioxidants, fragrances, preservatives, emollients, pH adjusters, and deodorants.

6. An easy-to-apply, elastic sunscreen skincare product, characterized in that, The active ingredient is the all-physical sunscreen composition as described in any one of claims 1 to 5.