Silicon-free cosmetic composition comprising isododene and hydrogenated

Abstract

The invention relates to the technical field of cosmetics, in particular to a silicon-free cosmetic composition containing isododecane and hydrogenated polydecene and a preparation method of the silicon-free cosmetic composition. The oil-based antirust agent comprises the following components in percentage by weight: 2-10% of isododecane, 0.1-2% of hydrogenated polydecene, 20-70% of polyol, 1-7% of an emulsifier, 0.1-2% of an auxiliary agent, 5-50% of an oil base, 0.1-1% of a thickening agent, 0.1-1% of a preservative and the balance of water. By using the isododecane and the hydrogenated polydecene and regulating the content ratio of the isododecane and the hydrogenated polydecene, the effect of no whitening after smearing is achieved on the basis of not adding a silicon-containing compound, and the silicone oil pollution is effectively reduced.

Description

Technical Field

[0001] This invention relates to the field of cosmetic technology, specifically to a silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene, and a method for preparing the same. Background Technology

[0002] In the cosmetics manufacturing industry, emulsification is generally considered one of the most practical preparation methods. Oil and water are inherently immiscible due to their high interfacial tension; even if temporarily mixed, they easily separate into layers. However, by adding emulsifiers that reduce interfacial tension, and combining this with mechanical stirring or other impactive actions, a stable fusion of the oil and water phases can be achieved. Silicone oil exhibits the lowest interfacial tension, a characteristic that not only provides a smooth application feel but also significantly reduces the whitening effect of emulsified creams through its encapsulating properties. However, the environmental pollution problems caused by silicone oil are becoming increasingly prominent. Furthermore, it may hinder normal skin respiration, affecting the excretion of metabolic waste and sweat, thus inducing various skin discomforts. Against this backdrop, consumer acceptance of silicone-containing cosmetics is gradually decreasing, and the market demand for the research and application of silicone-free emulsified creams is continuously rising.

[0003] Chinese invention patent application CN115634168A proposes a film-forming volatile liquid eyeshadow using acyclic pentameric dimethylsiloxane. This patent uses isododecane as the core volatile oil phase component, realizing the application of a silicone-free system in the makeup field and solving the problem of the heavy feel of traditional silicone-containing makeup. While using only isododecane as the volatile oil phase can ensure a refreshing feel, its moisturizing and long-lasting effects are insufficient. Summary of the Invention

[0004] The first aspect of the present invention provides a silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene, wherein, by weight percentage, the components include: 2-10% isododecane, 0.1-2% hydrogenated polydecene, 20-70% polyol, 1-7% emulsifier, 0.1-2% auxiliary agent, 5-50% oil base, 0.1-1% thickener, 0.1-1% preservative, and water to make up the balance.

[0005] Optionally, the oil base is present in the cosmetic composition at a content of 5-20 wt%.

[0006] Optionally, the content of isododecane in the cosmetic composition is 2-8 wt%.

[0007] Optionally, the hydrogenated polydecene is present in the cosmetic composition at a content of 0.1-1 wt%.

[0008] Optionally, the weight ratio of isododecane to hydrogenated polydecene is (7-18):1.

[0009] Optionally, the weight ratio of isododecane to hydrogenated polydecene is (8-14):1.

[0010] This invention has discovered that by using isododecane and hydrogenated polydecene, and controlling their content ratio, a non-whitening effect can be achieved after application without adding silicon-containing compounds, effectively reducing silicone oil pollution. Isododecane, as a low-viscosity, high-volatility straight-chain hydrocarbon, possesses excellent rapid spreading ability, ensuring that the system quickly and evenly covers the skin surface during application, avoiding refractive index differences caused by local component accumulation. Hydrogenated polydecene, as a high-viscosity, low-volatility polyolefin oil, not only imparts a suitable consistency to the system to optimize skin feel, but also controls the evaporation rate of isododecane through its low volatility. The two work synergistically through precise control of their content ratio: on the one hand, the rapid spreading of isododecane provides a uniform film-forming substrate for hydrogenated polydecene, avoiding the local aggregation problem that the latter is prone to due to its high viscosity; on the other hand, hydrogenated polydecene can delay the excessively rapid evaporation of isododecane, preventing premature drying of the system surface and whitening caused by rapid solvent loss and uneven film formation. At the same time, due to the structural characteristics of both being non-polar hydrocarbons, they ensure uniform surface refractive index after film formation, further suppressing whitening. This synergistic system achieves a non-whitening effect after application without relying on silicon-containing compounds, thus fundamentally avoiding the pollution problems caused by the migration and accumulation of silicone oil in the environment.

[0011] The polyols include at least one of glycerol, dipropylene glycol, diglycerol, butanediol, 1,3-propanediol, methylpropanediol, 1,2-pentanediol, 1,2-hexanediol, and 2,3-butanediol.

[0012] The emulsifier includes at least one of stearic acid, C14-22 alcohol, C12-20 alkyl glucoside, cetyl palmitate, sorbitan olive oil ester, palmitic acid, hydrogenated lecithin, cetearyl olive oil ester, sorbitan olive oil ester, glyceryl stearate SE, glyceryl stearate, stearyl alcohol, polyglycerol-6 behenate, polyglycerol-6 distearate, and candelilla wax / jojoba / rice bran polyglycerol-3.

[0013] The oil base includes emulsifying stabilizers, emollients, and skin conditioning agents.

[0014] The emulsifying stabilizer, emollient, and skin conditioning agent are all selected from at least one of the following: plant-derived, synthetic-derived, and fermentation-derived.

[0015] The plant sources include one or more of olive oil, coconut oil, castor oil, apple oil, camellia oil, almond oil, avocado oil, rosehip oil, green tea seed oil, sunflower seed oil, argan oil, macadamia oil, palm oil, and jojoba oil.

[0016] The synthetic sources include one or more of cetyl ethylhexanoate, propyl heptyl octanoate, ethylhexyl palmitate, triglyceride (ethylhexanoate), isopropyl myristate, isopropyl palmitate, octyl dodecanol, cocoyl octanoate / decanoate, isononyl isononanoate, and diisostearyl malate.

[0017] The adjuvants include one or more of the following: stabilizers, regulators, chelating agents, and neutralizing agents.

[0018] Optionally, the chelating agent includes one or more of the following groups: sodium phytate, tetrasodium pyrophosphate, disodium EDTA, sodium citrate, trisodium EDTA, and tetrasodium EDTA.

[0019] Optionally, the stabilizer and preservative include one or more of 1,2-hexanediol, ethylhexylglycerin, caprylyl glycol, capryloyl hydroxamic acid, glyceryl caprylate, phenoxyethanol, and p-hydroxyacetophenone.

[0020] Optionally, the neutralizing agent includes one or more of tromethamine, arginine, potassium hydroxide, triethanolamine, aminomethylpropanediol, L-arginine, sodium hydroxide, and sodium citrate.

[0021] Optionally, the regulator and thickener include one or more of xanthan gum, stearyl alcohol, acrylate / C10-30 alkanol acrylate crosspolymer, sodium polyacrylamide dimethyl taurate, hydroxyethyl acrylate / sodium acrylamide dimethyl taurate copolymer, hydroxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose.

[0022] A second aspect of the present invention provides a method for preparing a silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene, comprising the following steps: mixing water, polyol, emulsifier and auxiliary agent uniformly to obtain an aqueous phase; mixing isododecane, hydrogenated polydecene and oil base uniformly to obtain an oil phase; mixing the aqueous phase and oil phase uniformly to obtain a mixture; and adding a thickener and a preservative sequentially to the mixture to obtain the cosmetic composition.

[0023] Beneficial effects 1. The composition of the present invention does not contain any silicon compounds, thereby reducing environmental pollution caused by silicone oil from the source. At the same time, it avoids the problem of silicone oil coating the skin, hindering normal breathing, affecting the excretion of metabolic waste and sweat, and reducing the risk of skin discomfort.

[0024] 2. The composition of the present invention achieves a non-whitening or low-whitening effect after application of the silicone-free formulation by adjusting the specific content of isododecane and hydrogenated polydecene.

[0025] 3. The composition of the present invention, by limiting the weight ratio of isododecane and hydrogenated polydecene to (7-18):1, not only retains the refreshing feel of hydrocarbon oils, but also makes up for the lack of long-lasting moisturizing effect of a single volatile oil phase, thus improving the user experience.

[0026] 4. The composition of the present invention uses a specific oil base and is combined with low-irritant additives and preservatives to effectively improve its mildness.

[0027] 5. The composition of the present invention is simple to prepare and the system is stable, which is conducive to industrial mass production. Attached Figure Description

[0028] Figure 1 Evaluation of skin whitening after application to the examples and comparative cosmetic samples - skin appearance photographs.

[0029] Figure 2 The skin appearance whitening after applying the cosmetic samples to the examples and comparative examples is evaluated using the L value (brightness). Detailed Implementation

[0030] Examples 1-3, Comparative Examples 1-2 A silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene, the components of which are shown in Table 1 by weight percentage, "-" indicating no addition.

[0031] Table 1

[0032] The raw material grades for isododecane and hydrogenated polydecene are BST-AS.

[0033] A method for preparing a silicone-free cosmetic composition containing isododecane and hydrogenated polydecene: As shown in Table 1, the components are divided into an aqueous phase, an oil phase, a thickener, and a preservative; the specific steps are as follows: the aqueous phase and the oil phase are stirred and heated to 70°C separately, and set aside; the prepared aqueous phase and oil phase are mixed to prepare a mixture. Subsequently, the thickener is heated to 70°C, dissolved, and added to the mixture to adjust the viscosity of the mixture. Finally, the preservative is heated to 70°C, dissolved, and added to the mixture, and then cooled to 45°C to obtain the cosmetic composition.

[0034] Performance testing methods Performance Test 1: After applying the cosmetic sample, the degree of whitening was evaluated by comparing the skin appearance. After applying the cosmetic compositions of Examples 1-3 and Comparative Examples 1-2, the changes in skin whitening were observed with the naked eye.

[0035] Adult women with sensitive skin were selected to evaluate the whitening effect before and after applying the cosmetic sample. After the test area was washed with Ivory soap, the subjects waited for 10 minutes in a constant temperature and humidity room (22±2℃, 40%~60%RH) before taking a photo of their skin before applying the cosmetic composition.

[0036] Next, 25 μl of the cosmetic compositions from Examples 1-3 and Comparative Examples 1-2 were applied to the test site (inner lower part of the skin (25 mm)). The product was then applied in a clockwise circular motion 10 times. Skin photographs were then taken using the same method as before application. Photographs were taken using a VISIA-CR (Canfield Scientific, Inc., USA).

[0037] like Figure 1 As shown, in Example 1, which used isododecane and hydrogenated polydecene as hydrocarbon oils, no whitening occurred after the subjects applied the cosmetic sample. In Comparative Example 1, which used silicone oil (polydimethylsiloxane), no whitening occurred after the subjects applied the cosmetic sample. However, in Comparative Example 2, which used methyl heptyl isostearate (a type of hydrocarbon oil), the subjects experienced very high skin whitening after applying the cosmetic sample. Compared to Example 1, in Examples 2 and 3, which used less isododecane and hydrogenated polydecene, although whitening occurred, the degree of whitening was lower than in Comparative Example 2. Therefore, it can be concluded that by using isododecane and hydrogenated polydecene, a cosmetic composition that does not cause whitening can be manufactured even without the use of silicone components.

[0038] Performance Test 2: After applying the cosmetic sample, the whiteness was evaluated by measuring the L value (brightness). After applying the cosmetic compositions of Examples 1-3 and Comparative Examples 1-2, the L value was measured to observe changes in skin whitening. The L value represents the degree of color brightness; the higher the skin whitening, the higher the L value.

[0039] Five adult men and women with sensitive skin (mean age 29.8 years) were selected to evaluate the whitening effect of the cosmetic sample before and after application. Skin photos before and after application were taken in the same manner as in Example 1. The average L value before and after application was compared using Image Pro Analyzer (Media Cybernetics, Inc., USA) to evaluate the change in skin whitening.

[0040] Depend on Figure 2It was found that Example 1, using isododecane and hydrogenated polydecene as hydrocarbon oils, confirmed that the L value of the test area decreased by 0.3% after applying the cosmetic sample, confirming that no whitening occurred. Furthermore, Comparative Example 1, using silicone oil, showed almost no change in L value after applying the cosmetic sample, but Comparative Example 2, using methyl heptyl isostearate, showed a very high increase in L value after applying the cosmetic sample. Compared to Example 1, Example 2, using a lower content of isododecane and hydrogenated polydecene, showed an increase in L value of 2.3%, but this value was lower than the 3.4% of Comparative Example 2. Therefore, it can be confirmed that by using isododecane and hydrogenated polydecene, a cosmetic composition that does not cause whitening can be manufactured even without the use of silicone components.

Claims

1. A silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene, characterized in that, By weight percentage, the components include: 2-10% isododecane, 0.1-2% hydrogenated polydecene, 20-70% polyol, 1-7% emulsifier, 0.1-2% additives, 5-50% oil base, 0.1-1% thickener, 0.1-1% preservative, and water to make up the balance.

2. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 1, characterized in that, The content of isododecane in the cosmetic composition is 2-8 wt%.

3. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 2, characterized in that, The hydrogenated polydecene is present in the cosmetic composition at a content of 0.1-1 wt%.

4. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 2 or 3, characterized in that, The weight ratio of isododecane to hydrogenated polydecene is (7-18):

1.

5. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 4, characterized in that, The weight ratio of isododecane to hydrogenated polydecene is (8-14):

1.

6. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 1 or 5, characterized in that, The polyols include at least one of glycerol, dipropylene glycol, diglycerol, butanediol, 1,3-propanediol, methylpropanediol, 1,2-pentanediol, 1,2-hexanediol, and 2,3-butanediol.

7. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 6, characterized in that, The emulsifier includes at least one of stearic acid, C14-22 alcohol, C12-20 alkyl glucoside, cetyl palmitate, sorbitan olive oil ester, sorbitan palmitate, palmitic acid, hydrogenated lecithin, cetearyl olive oil ester, glyceryl stearate SE, glyceryl stearate, stearyl alcohol, polyglycerol-6 behenate, polyglycerol-6 distearate, and candelilla wax / jojoba / rice bran polyglycerol-3.

8. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 1 or 7, characterized in that, The oil base includes emulsifying stabilizers, emollients, and skin conditioning agents.

9. The silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to claim 8, characterized in that, The emulsifying stabilizer, emollient, and skin conditioning agent are all selected from at least one of the following: plant-derived, synthetic-derived, and fermentation-derived.

10. A method for preparing a silicone-free cosmetic composition comprising isododecane and hydrogenated polydecene according to any one of claims 1-9, characterized in that, The process includes the following steps: mixing water, polyol, emulsifier and additives evenly to obtain an aqueous phase; mixing isododecane, hydrogenated polydecene and oil base evenly to obtain an oil phase; mixing the aqueous phase and oil phase evenly to obtain a mixture; and adding thickener and preservative to the mixture in sequence to obtain a cosmetic composition.

Images