Reinforced basecoat compositions

Abstract

The present invention relates to a nail base coat composition having photocurable properties, characterized in that it comprises between 0.04 and 0.1 wt.% of Vitamin C, between 0.04 and 0.1 wt.% of Vitamin E and between 0.08 and 0.12 wt.% of hexanal, based on the total weight of the composition, and at least one monomer-free resin, preferably a monomer-free methacrylate resin, said monomer-free resin comprising one or more oligomers together with one or more photoinitiators. The present invention also provides a process for the manufacture of said composition and discloses a process for the application of said nail base coat composition to the nails of a user, its curing using UV or LED light.

Description

Technical Field

[0001] This invention relates to the field of cosmetic nail care products, and particularly to a light-curable strengthening nail base coat. The invention provides a novel formulation of a light-curable nail base coat composition, a method for manufacturing the light-curable base coat composition, and a method for applying the light-curable base coat composition, which enhances adhesion, durability, and overall nail health. Background Technology

[0002] A base coat composition is a clear or colored nail polish composition applied to the nail prior to a colored nail polish. Its primary purpose is to create a smooth surface for the colored nail polish composition to adhere, promoting better adhesion and the durability of the manicure. The base coat also helps protect natural nails from staining that can occur when using dark or vibrant nail polish colors.

[0003] When applied, the base coat is typically used as the first step in a three-step nail polish application process, which includes a base coat, colored nail polish, and a top coat to increase shine and durability. Using a base coat not only enhances the appearance of your manicure but also contributes to the overall health and strength of your nails.

[0004] Applying a base coat is a common step in professional or at-home manicures. It helps create a more even and glossy look and contributes to overall nail health by providing a protective barrier between natural nails and colored nail polish.

[0005] Since the base coat is applied as the first layer, followed by one or more other layers of nail polish, its drying rate is a critical factor, as it affects the overall application process and the time required for the manicure. Therefore, the use of traditional air-drying base coats is increasingly being replaced by base coats with higher drying rates, such as quick-drying base coats, UV-curable base coats, spray-on base coats, and heat-activated base coats.

[0006] Light-curable nail base coat compositions represent cutting-edge innovation in nail care, designed for rapid drying and enhanced performance. These formulations typically comprise blends of advanced light-curable polymers, adhesion enhancers, and flexibility modifiers. The light-curable polymers enable rapid curing under ultraviolet (UV) or LED light, ensuring a fast drying process. Adhesion enhancers contribute to a strong bond between the base coat and the natural nail, providing a durable base for colored nail polish.

[0007] Currently, the use of light-curable nail compositions is almost ubiquitous in nail salons, and their use in homes has also become very common, thanks to the development of devices (UV or LED technology) used for curing.

[0008] Despite their efficiency, photocurable nail base coats still have potential drawbacks, including brittleness, adhesion challenges, sensitivity to application conditions, impact on nail quality, and the risk of allergic reactions. Different ingredients have been added in an attempt to mitigate these drawbacks. However, incorporating different ingredients into photocurable nail compositions presents challenges due to the complex balance required for effective curing, where photochemical reactions must be coordinated with the different functional properties of the additives without compromising the overall integrity of the formulation while minimizing the risk of allergies.

[0009] The present invention is proposed in view of the above-mentioned disadvantages. Summary of the Invention

[0010] According to a first aspect, the present invention relates to a novel photocurable base coat composition. According to the invention, the term "photocurable base coat composition" refers to a nail base composition having photocurable properties, that is, having photocurable properties based on the presence of one or more photoinitiators. The novel photocurable base coat composition includes vitamin C, vitamin E, and hexanal as active ingredients. The inventors of the present invention have unexpectedly determined that the photocurable base coat composition comprising vitamin C, vitamin E, and hexanal produces a stable formulation that improves the holding power of the crosslinked system and nail quality. More specifically, the nail polish lasts longer without peeling, poses no risk of nail allergies, and after removal of the nail polish, the nails appear healthy and are less brittle. Furthermore, the nail polish and / or base coat applied to the base coat can be easily removed using an acetone-free nail polish remover that prevents damage to the nails.

[0011] Vitamin C (ascorbic acid) is a powerful antioxidant that helps protect nails from oxidative stress caused by free radicals. This property helps maintain the overall health and strength of nails. It also plays a role in collagen synthesis, which is essential for maintaining the structural integrity of nails. This results in improved nail flexibility and elasticity.

[0012] Vitamin E (tocopherol) is an antioxidant that helps protect nails from free radical damage, preventing problems such as brittleness and breakage. It also helps retain moisture, promoting hydrated nails. Hydrated nails are less prone to breakage and splitting.

[0013] Hexanal can help form a durable and resilient surface, reducing the likelihood of peeling. Hexanal can also increase the hardness of nails, providing a protective barrier against external stressors.

[0014] While using any of the above components alone can be beneficial for increasing nail protection and strength, caution is essential regarding the amount added. In particular, each of these components should be incorporated in an amount sufficient to maintain the intended properties of the nail base coat composition and further ensure the stability and effectiveness of the overall formulation.

[0015] The inventors of this invention have demonstrated that when a composition containing a combination of vitamin C, vitamin E, and hexanal is used in a light-curable base coat, each of these components can be used in small amounts to ensure increased stability of the overall product, while simultaneously acting synergistically in terms of benefits such as improved nail quality or healthier nails after removal. This results in a holistic nail care approach by limiting the user's allergic reaction through the use of minimum effective amounts of each component, addressing antioxidant protection, collagen synthesis, moisture retention, and enhancements due to this synergistic effect. According to the invention, the term "minimum effective amount" refers to the minimum necessary amount of each component to allow for a synergistic effect between them, maintain the stability of the nail composition, and obtain a nail composition that is hypoallergenic and capable of caring for the nails.

[0016] In a more specific manner, the composition according to the invention provides: Improved cross-linking: The combination of effective amounts of vitamin C, vitamin E, and hexanal in a light-curable base coat is likely to enhance the cross-linking of polymers in the formulation. This results in a more robust and resilient coating on the nails.

[0017] Extended nail polish lifespan: The enhanced cross-linking system, combined with the individual properties of these components, contributes to longer-lasting nail polish application. Nail polish is less prone to peeling or chipping.

[0018] Healthy nails after removal: After removing nail polish, nails appear healthier. The antioxidant properties of vitamins C and E, along with the strengthening effect of hexanal, help nails not only look aesthetically pleasing but also be more resilient and less brittle.

[0019] Limiting the risk of allergic reactions: Each component is sourced from the simplest possible source and contains no components identified as pathogens that could cause allergic side effects. Furthermore, each component, especially the active ingredient, is included in the composition in the lowest possible amount to maintain the stability and light-curing properties of the nail base composition.

[0020] It has been established that specific concentrations ensure the effectiveness of nail products throughout their entire shelf life (up to two years). Furthermore, these specific concentrations ensure ease of formulation, allowing nail products to be manufactured using standard equipment without the need for specialized facilities. Additionally, the product's stability is maintained throughout its shelf life without the formation of deposits or other alterations.

[0021] In a preferred embodiment of the invention, the content of vitamin C is between 0.04 and 0.1 wt.%, the content of vitamin E is between 0.04 and 0.1 wt.%, and the content of hexanal is between 0.08 and 0.12 wt.%, based on the total weight of the composition.

[0022] In another embodiment, the photocurable nail base coat composition includes at least one solvent, at least one film-forming agent, at least one plasticizer, at least one resin, and optionally a rheology modifier.

[0023] In a preferred embodiment, the at least one solvent may be an organic solvent, preferably ethyl acetate and / or butyl acetate and / or at least one alcohol selected from ethanol, isopropanol, and butanol. In a more preferred embodiment, the at least one solvent is derived from a vegan source.

[0024] In another preferred embodiment, the at least one film-forming agent is polyvinyl butyral.

[0025] In another preferred embodiment, the at least one plasticizer is tributyl citrate.

[0026] In another preferred embodiment, the at least one resin is selected from elemol resin, polyester resin; p-toluenesulfonamide / epoxy resin; epoxy resin; sucrose benzoate; p-toluenesulfonamide / formaldehyde resin, toluenesulfonamide / formaldehyde resin, or polymers and / or copolymers of these various resins. In a preferred embodiment, the resin is obtained from a vegan source.

[0027] In another preferred embodiment, the resin comprises one or more oligomers and one or more photoinitiators. In a more preferred embodiment, the resin is monomer-free, preferably monomer-free of methacrylate monomers.

[0028] In another embodiment, the composition is colorless. In yet another embodiment, the composition further comprises a pigment or dye.

[0029] In a second aspect, the present invention relates to a method for manufacturing a light-curable nail base coat composition according to the invention, the method comprising the step of adding a mixture of vitamin C, vitamin E and hexanal to a composition for use as a base coat, said composition for use as a base coat comprising at least one solvent, at least one film-forming agent, at least one plasticizer and at least one resin.

[0030] The manufacturing method is designed for simplicity and scalability. The use of common mixing equipment ensures availability and ease of production, making the formulation process simple and adaptable to various manufacturing environments.

[0031] The mixing device can be any common mixing equipment, such as a stainless steel bowl equipped with any mixing mechanism, including but not limited to blades, impellers, or stirrers. The simplicity and scalability of the manufacturing method contribute to cost-effectiveness and ease of production at different scales.

[0032] In a preferred embodiment, the manufacturing process is carried out at a temperature below 35°C, preferably at room temperature to avoid the decomposition of vitamin C.

[0033] In another preferred embodiment, the mixing device is a stainless steel device.

[0034] In a third aspect, the present invention relates to a method for applying a nail care product composition according to the invention, the method comprising the following steps: a) Apply a light-curable nail base coat composition to the nail; b) Curing the nail base coat composition using UV or LED light; and c) Optionally apply at least one layer of other nail product.

[0035] In another aspect, the present invention provides a method for removing a nail care product composition according to the invention from nails, the method comprising the following steps: Soak each nail in the acetone-free nail polish remover composition for at least 1 minute; Rub the nail sideways and away from the skin to remove residue.

[0036] The composition is removed from the nail without the need for acetone and / or nail filing. After soaking with the acetone-free nail polish remover composition for at least 1 minute, a loose film forms on the nail base coat, which shrinks in size and can be easily removed from the nail by gentle rubbing. Detailed Implementation

[0037] For the purposes of this disclosure, the following definitions are given: As used herein, the terms “comprising,” “comprises,” and “comprised of” are synonymous with “including,” “includes,” “containing,” and “contains,” and are inclusive or open-ended, not excluding additional, non-enumerated members, elements, or method steps. The terms “comprising,” “comprises,” and “comprised of” also include the term “consisting of.”

[0038] The enumeration of numerical ranges by endpoints includes all integers and fractions, where appropriate, subdivided into the range (e.g., when referring to, for example, the number of elements, 1 to 5 may include 1, 2, 3, 4, 5, and when referring to, for example, measurements, it may also include 1.5, 2, 2.75, and 3.80). The enumeration of endpoints also includes the listed endpoint values ​​themselves (e.g., 1.0 to 5.0 includes both 1.0 and 5.0). Any numerical range enumerated herein is intended to include all subranges subdivided therein.

[0039] This invention provides a novel formulation of a light-curable nail base coat composition, a method for manufacturing the light-curable base coat composition, and a method for applying the light-curable base coat composition, which enhances adhesion, durability, and overall nail health.

[0040] Regarding the first aspect, this disclosure relates to a novel light-curable base coat composition. The novel light-curable base coat composition comprises vitamin C, vitamin E, and hexanal as active ingredients. The following detailed description highlights the synergistic effect and the resulting positive results for nail health: Improved crosslinking In a light-curable base coat, a combination of vitamin C, vitamin E, and hexanal in effective amounts for nail care is designed to enhance the cross-linking of the polymers in the formulation. Cross-linking refers to the formation of bonds between polymer chains, creating a more complex and robust network. This increased cross-linking results in a resilient coating on the nails, providing a durable and protective layer.

[0041] Extended lifespan of nail polish The enhanced cross-linking system, a result of the synergistic interaction between Vitamin C, Vitamin E, and hexanal, significantly contributes to the durability of nail polish application. The enhanced durability of the coating, combined with the individual properties of each component, results in nail polish that is less susceptible to common problems such as peeling or flaking. Users can enjoy an extended lifespan for their nail polish, maintaining a clean and well-trimmed appearance for a longer period.

[0042] Nail health after removal Beyond the duration of the manicure, the overall benefits of the synergistic composition become apparent even after the nail polish has been removed. The antioxidant properties of vitamins C and E play a crucial role in protecting nails from oxidative stress, contributing to a healthier appearance. Furthermore, the strengthening effect of hexanal reduces nail brittleness after removal, enhancing overall elasticity.

[0043] Limiting the risk of allergic reactions Each component is sourced from the simplest possible source and contains no components identified as pathogens that could cause allergic side effects. Furthermore, each component, especially the active ingredient, is present in the composition in the lowest possible amount to maintain the stability and light-curing properties of the nail base composition.

[0044] In summary, the synergistic combination of specific amounts of vitamin C, vitamin E, and hexanal in a monomer-free, light-curable base coat creates a multifaceted nail care approach. This approach not only improves nail quality during application but also extends the lifespan of the manicure and even promotes healthier nails after removal. This formulation addresses both aesthetic and structural aspects, providing users with a comprehensive solution for maintaining beautiful and resilient nails without any risk of allergic reactions.

[0045] Vitamin C (ascorbic acid) is a powerful antioxidant that helps protect nails from oxidative stress caused by free radicals. Vitamin C is a water-soluble vitamin and, due to its stability and compatibility with formulations, can be used directly or as a derivative. For example, technicians can choose between water-soluble and oil-soluble derivatives. Examples of water-soluble vitamin C derivatives are, but are not limited to, ascorbic acid, sodium ascorbate phosphate, and magnesium ascorbate phosphate. Examples of oil-soluble vitamin C derivatives are, but are not limited to, ascorbate palmitate and ascorbate tetraisopalmitate.

[0046] Vitamin E, also known as tocopherol, is a fat-soluble vitamin with powerful antioxidant properties. Vitamin E is a potent antioxidant that helps neutralize free radicals. Free radicals can damage cells, including those in the nails, leading to problems like brittleness and nail breakage. It also helps retain moisture in the nails. Well-hydrated nails are more resilient and less prone to breakage and splitting. Vitamin E can be incorporated into light-curable compositions as vitamin E oil extracted from natural sources. Alternatively, it can be incorporated as a vitamin E derivative. Examples of vitamin E derivatives are, but are not limited to, tocopherol acetate, tocopherol succinate, tocopherol linoleate, tocopherol nicotinate, and tocopherol phosphate.

[0047] Hexanal is known for its strengthening effects on nails. It helps form a durable and resilient surface, reducing the likelihood of peeling. Hexanal has been shown to increase nail hardness and provide a protective barrier against external stressors.

[0048] In a preferred embodiment of the invention, the content of vitamin C, vitamin E, and hexanal is between 0.04 and 0.1 wt.%, based on the total weight of the composition. The combination of 0.04 to 0.1 wt.% vitamin C, 0.04 to 0.1 wt.% vitamin E, and 0.08 to 0.12 wt.% hexanal is designed to work synergistically to enhance the overall performance of the nail product. This combination addresses antioxidant protection, collagen synthesis, moisture retention, and enhancement, providing comprehensive nail care.

[0049] The specified concentrations have been determined to ensure the effectiveness of the nail product throughout its entire shelf life (which can be extended to two years) and to minimize the amount of components as much as possible. Furthermore, they play a crucial role in maintaining the product's stability throughout its shelf life. The formulation is designed to prevent deposits or any other undesirable changes, such as yellowing, microbial contamination, or reduced light curing. This stability ensures that the product maintains consistent quality and appearance from the time of manufacture until its expiration date. This durability is essential for maintaining the product's efficacy and delivering consistent benefits to the user over the extended period.

[0050] The chosen concentration not only optimizes product performance but also simplifies the formulation process. Ease of formulation is emphasized, highlighting the use of common equipment without the need for specialized machinery. This simplifies the manufacturing process, making it accessible and cost-effective.

[0051] The photocurable nail base coat composition includes at least one solvent, at least one film-forming agent, at least one plasticizer, at least one resin, and optionally a rheology modifier.

[0052] In a preferred embodiment, the at least one solvent may be an organic solvent. The organic solvent may include one or more solvents selected from: short-chain esters having a total of 3 to 8 carbon atoms, such as ethyl acetate, methyl acetate, propyl acetate, isopropyl acetate, butyl acetate, isoamyl acetate, methoxypropyl acetate, or butyl lactate; ketones that are liquid at ambient temperature; alcohols, such as ethanol, isopropanol, butanol, or diacetone alcohol; straight-chain or branched aliphatic hydrocarbons that are saturated (such as alkanes) or unsaturated and liquid at ambient temperature; aromatic hydrocarbons, such as toluene or xylene; and mixtures thereof.

[0053] Preferably, the organic solvent is ethyl acetate and / or butyl acetate and / or at least one alcohol selected from ethanol, isopropanol, and butanol. Ethyl acetate and butyl acetate are rapidly evaporating solvents. This property allows nail products to dry quickly after application, reducing the user's waiting time. Alcohols also contribute to rapid evaporation. This is particularly important for nail products such as base coats and top coats, where rapid drying is desired. Ethyl acetate and butyl acetate are effective solvents for many nail polish resins and ingredients, providing good solubility for pigments, polymers, and additives. Alcohols can also enhance solubility. This ensures uniform formulation and uniform distribution of components. These solvents contribute to the smooth application of nail products. They help to spread the formulation evenly, promoting a uniform coating on the nails. This is essential for achieving a smooth and professional finish. In a more preferred embodiment, the organic solvent is derived from a vegan source. Non-limiting examples include ethyl acetate from sugarcane extract and butyl acetate from cassava extract.

[0054] According to the present invention, the at least one film-forming agent can be a cellulose film-forming agent, preferably selected from nitrocellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose acetate butyrate and / or cellulose acetate propionate, or polyvinyl butyral. These contribute to the adhesion, abrasion resistance, and overall durability of nail products, ensuring a smooth and protective coating on the nails. These agents play an essential role in producing an elastic film that enhances both the aesthetics and functionality of nail preparations. In a more preferred embodiment, at least one film-forming agent may be derived from a vegan source. Non-limiting examples include nitrocellulose derived from cotton extracts.

[0055] Polyvinyl butyral is a preferred film-forming agent. It offers advantages such as strong adhesion, flexibility, clarity, chemical resistance, durability, UV stability, versatility, and efficient film formation. These properties collectively contribute to the overall quality and performance of nail coatings, enhancing both aesthetics and functionality.

[0056] Plasticizers are additives commonly used in nail polish and other coatings to impart flexibility, durability, and ease of application. They work by reducing the brittleness of film-forming agents, allowing the film to bend and flex without cracking. In the context of nail products, plasticizers play a crucial role in enhancing the overall performance and appearance of nail polish. Examples of plasticizers include (but are not limited to) dibutyl phthalate, dioctyl phthalate, triphenyl phosphate, camphor, and tributyl citrate. Preferably, the plasticizer is tributyl citrate (TBC). TBC is a non-phthalate plasticizer known for its low toxicity, making it a preferred choice for formulations designed to minimize potential health risks associated with certain plasticizers. It is biodegradable, contributing to sustainability in product formulations. TBC is generally odorless and colorless and compatible with a wide variety of resins and solvents commonly used in nail polish formulations. This compatibility allows for smooth and homogeneous mixtures, contributing to the overall stability of the nail product. As a plasticizer, TBC effectively enhances the flexibility of the nail polish film, reducing the likelihood of cracking or peeling. This ensures longer-lasting and more flexible nail art.

[0057] Preferably, the plasticizer is derived from a vegan source. Non-limiting examples of plasticizers derived from vegan sources include... The at least one resin may be selected from elemol resin, p-toluenesulfonamide / epoxy resin; epoxy resin; sucrose benzoate; p-toluenesulfonamide / formaldehyde resin, toluenesulfonamide / formaldehyde resin, or polymers and / or copolymers of these various resins. The choice of resin is a key aspect of nail product formulation, significantly contributing to the performance, appearance, and durability of the final product. Each type of resin has its own advantages. Elemi resins derived from trees provide flexibility and adhesion. They contribute to the overall strength of the nail coating while enhancing its application properties. p-Toluenesulfonamide / epoxy resins are known for their toughness and adhesion; these resins are often used in nail products to produce a strong, peel-resistant film. Epoxy resins contribute to the hardness and durability of the nail coating. They are valuable because they can produce a robust film that withstands daily abrasion. Polyurethane resins are known for their flexibility and durability; polyurethane resins enhance the overall elasticity of the nail coating, contributing to long-lasting manicures. Sucrose benzoate is commonly used due to its film-forming and adhesion properties. It contributes to the overall structure and abrasion resistance of nail products. p-Toluenesulfonamide / formaldehyde resins are valuable for their adhesion and toughness, providing a robust base for nail coatings. In a more preferred embodiment, the resin is derived from a vegan source.

[0058] According to the present invention, the nail base composition contains the incorporation of a resin comprising one or more oligomers, along with the addition of a photoinitiator. This precise combination is designed to leverage the benefits of photopolymerization or photocuring processes, introducing several advantages that enhance the overall performance of the nail product and the user experience.

[0059] Oligomers are medium-sized molecules, typically composed of a small number of monomer units. Their inclusion contributes to the viscosity of the formulation, aiding in the application and adhesion of the product. This invention may utilize all oligomers known to those skilled in the art for use in nail compositions, preferably naturally derived oligomers, especially dimer, trimer, tetramer, and pentamer molecules.

[0060] Photoinitiators are compounds that promote the initiation of photopolymerization processes. When exposed to light, photoinitiators produce reactive substances that initiate crosslinking of monomers and oligomers, leading to the formation of a cured film. The rapid curing associated with photoinitiators helps minimize the risk of smudging or indentation of newly applied nail products. Examples of photoinitiators include, but are not limited to: benzoin methyl ether (BME), benzoin ethyl ether (BEE), benzoin isobutyl ether (BIE), benzoin benzyl ether (BBE), camphorquinone (CQ), Irgacure 819™ (phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide), Irgacure 184™ (1-hydroxycyclohexylphenyl ketone), Darocur 1173™ (2-hydroxy-2-methyl-1-phenyl-propane-1-one), LucirinTPO™ (2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide), Darocur 4265™ (tris(2-hydroxyethyl)isocyanurate triacrylate), thioxanone, benzoin O-ethyl ether (BOEE), ethyl 4-dimethylaminobenzoate (EDMAB), and ethyl trimethylbenzoylphenylphosphine (TPO). Preferably, the photoinitiator is ethyl trimethylbenzoylphenylphosphine.

[0061] The incorporation of oligomers and photoinitiators enhances the efficiency of the application process. Users can experience faster and easier application, reducing drying time. Advanced formulations help produce a cured film with enhanced hardness and durability. This results in longer-lasting nail polish and reduces the frequency of touch-ups or reapplication.

[0062] According to the invention, the resin is monomer-free, and particularly preferably monomer-free of methacrylate monomers. Monomers, and especially methacrylate monomers, have been identified as pathogens of allergic side effects associated with the use of curable compositions. Allergic reactions (ranging from mild irritation to more severe reactions) have been associated with the presence of these monomers in various curable formulations.

[0063] Methacrylate monomers, commonly used in the synthesis of resins and polymers, have been identified as potential allergens, triggering adverse skin reactions and sensitivities. In the context of curable compositions, these monomers can come into direct contact with the skin during application and curing, leading to undesirable health effects.

[0064] To address this concern and enhance user safety, the formulation in this embodiment excludes monomers, specifically targeting the elimination of methacrylate monomers. This not only reduces the risk of allergic reactions but also contributes to the overall biocompatibility of the curable composition and improves the synergistic effect of the active ingredients vitamin A, vitamin E, and hexanal, without affecting photocuring properties. By selecting methacrylate-free monomer resins, this formulation aims to provide a safer and more user-friendly product, minimizing the potential for skin sensitivities and adverse health effects associated with conventional curable compositions containing such monomers.

[0065] In another embodiment, the composition is colorless. According to the invention, the term "colorless" refers to a composition without pigments or dyes. In another embodiment, the composition further comprises pigments or dyes.

[0066] Regarding a second aspect of the invention, it relates to a method for manufacturing a photocurable nail base coat composition according to the invention, wherein the method comprises the steps of: adding a mixture and at least one monomer-free resin to a composition for the base coat, said mixture comprising, based on the total weight of said mixture, 0.04 to 0.1 wt.% vitamin C, 0.04 to 0.1 wt.% vitamin E, and 0.08 to 0.12 wt.% hexanal, said at least one monomer-free resin comprising one or more oligomers together with one or more photoinitiators, said composition for the base coat comprising at least one solvent, at least one film-forming agent, and at least one plasticizer. The manufacturing method is designed for simplicity and scalability. The use of common mixing equipment ensures availability and ease of production, making the formulation process simple and adaptable to different manufacturing environments.

[0067] To begin the manufacturing process, the components of the nail product composition (including solvents, film-forming agents, plasticizers, and other optional ingredients) are carefully measured and added to the mixing equipment in the appropriate steps. The order of addition and mixing duration are optimized to ensure uniformity and distribution of the components.

[0068] Mixing devices, such as stainless steel bowls equipped with mixing mechanisms, facilitate thorough blending of components. The choice of mixing equipment allows for flexibility to accommodate different production volumes while maintaining consistent product quality.

[0069] Once all components are added, the mixing process is initiated to ensure uniform dispersion of the ingredients and that the formulation achieves the desired consistency.

[0070] After the mixing process is complete, the resulting formulation is ready for further processing. The formulation is then dispensed into appropriate packaging, such as bottles or tubes, ready for distribution and use.

[0071] The simplicity of the manufacturing method, combined with the use of common mixing equipment, not only simplifies production but also enables manufacturers of all sizes to produce nail product compositions. This adaptability allows for efficient manufacturing in both small-batch and large-scale production environments.

[0072] The mixing device can be any common mixing equipment, such as a stainless steel bowl equipped with any mixing mechanism, including but not limited to blades, impellers, or stirrers. The simplicity and scalability of the manufacturing method contribute to cost-effectiveness and ease of production at different scales.

[0073] In a preferred embodiment, the manufacturing process is carried out at a temperature below 35°C, preferably at room temperature, to avoid the decomposition of vitamin C and the denaturation or destruction of vitamin E, hexanal, and other components.

[0074] In another preferred embodiment, the mixing device is a stainless steel device.

[0075] Regarding a third aspect, the present invention relates to a method for applying the nail base coating composition of the present invention having photocurable properties, the method comprising the following steps: a) Applying a nail base coat composition with photocurable properties to the nail; b) Curing the nail base coat composition using UV or LED light; and c) Optionally apply at least one layer of other nail product.

[0076] This method is designed to provide a systematic and effective approach to achieve optimal results in nail care.

[0077] Regarding step a), the nail base coat composition having photocurable properties is applied to the nail.

[0078] The base coat is applied to the nail in a thin, even layer using a brush to cover virtually the entire nail surface. Careful and precise application of the light-curable nail base coat is crucial for optimal results. Even coverage ensures uniform curing and nail strengthening.

[0079] Before applying the base coat, this step may include first preparing the nails, ensuring they are clean and dry. Applying a treatment agent to the nail surface is also envisioned.

[0080] Regarding step b), the nail base coating composition is cured using UV or LED light: After applying the photocurable nail base coat, the next step involves the curing process. This is achieved by exposing the coated nail to a UV or LED light source. Exposure to UV or LED light triggers a photopolymerization process, resulting in the formation of a durable and resilient film on the nail.

[0081] UV curing involves the use of ultraviolet light, typically in the UVA spectrum (320 nm). In the UV light spectrum (around 400 nm), traditional UV lamps emit a broad spectrum of UV light, with a significant portion falling within the UVA range. The optimal wavelength for UV curing in the nail industry is approximately 365 nm. Compared to LED curing, UV curing can be time-consuming, typically ranging from 2 to 4 minutes. However, advancements in UV lamp technology have led to faster curing times in some cases.

[0082] LED curing utilizes light-emitting diodes (LEDs) that emit light at specific wavelengths. In the context of nail care, LED lamps primarily emit light in the UVA range, typically around 365 nm, similar to UV lamps. LED lamps used for nail care are designed to emit light at the specific wavelengths required for the curing of photopolymerizable nail products. LED curing is known for its rapid curing time. The process is significantly faster than traditional UV curing, with typical curing times ranging from 30 seconds to 1 minute. LED lamps are more energy efficient than traditional UV lamps, consuming less power and generating less heat during the curing process. LED lamps also have a longer lifespan compared to traditional UV lamps, making them a durable and cost-effective option.

[0083] In a more preferred embodiment, curing is performed using LED light. Preferred examples of voltage and time are 24 W LED light for 2 minutes, 36 W LED light for 1 minute, or 36 W LED light for 1 minute. The nail composition is sufficiently strengthened to remain on the nail for at least 2 weeks without peeling.

[0084] Regarding step c), optionally apply at least one layer of other nail product: This step allows for further customization and creativity in nail styling. After the base coat has cured, users have the option to apply additional layers of different nail products. Users can choose to apply colored nail polish, nail art designs, or additional protective layers according to their preferences. The cured base coat provides a stable foundation for the application of other nail products.

[0085] The method outlined in the third aspect of the invention provides a systematic approach to nail care that emphasizes strengthening, durability, and creative expression. By applying a light-curable base coat and optional additional layers, users can achieve enhanced nail aesthetics while benefiting from the protective and strengthening characteristics of the formulated base coat.

[0086] Regarding a fourth aspect of the invention, namely a method for gently and effectively removing a nail care product composition according to the invention from nails, the method comprising the following steps: Soak each nail in the acetone-free nail polish remover composition for at least 1 minute; Rub the nail sideways and away from the skin to remove residue.

[0087] The acetone-free nail polish remover composition may be any known acetone-free removal composition suitable for removing cured compositions. Non-limiting examples include compositions based on ethyl acetate, alcohols, or combinations thereof. In a further preferred embodiment, the acetone-free nail polish remover composition is rich in castor oil.

[0088] In another embodiment, impregnation is performed by applying a material impregnated with the acetone-free nail polish remover composition. The material may be a textile material, such as cotton. In a further preferred embodiment, the impregnated material is secured to the nail plate, preferably using pliers.

[0089] Experimental Section To evaluate the stability of the nail base coating composition with photocurable properties of the present invention, the applicant tested the different compositions shown in Table 1, which were based on a reference control composition called Green Flash™ with different components added.

[0090] The Green Flash TM The base coat composition comprises the following: ethyl acetate, butyl acetate, polyvinyl butyral, bis-hema poly(1,4-butanediol)-9 / IPDI copolymer, p-toluenesulfonamide / epoxy resin, styrene / acrylate copolymer, trimethylbenzoylphenylphosphine ethyl ester, tributyl citrate, isopropanol, phosphoric acid, and BHT. In this Green Flash... TM In the base coating composition, trimethylbenzoylphenylphosphine ethyl ester corresponds to the photoinitiator. In the following text, Table 1 shows the compositions for each test in Green Flash. TM The amounts of other components added to the primer composition are expressed as wt% based on the total weight of the final composition.

[0091] Table 1

[0092] In other words, for this experimental test, the data was sent to Green Flash. TMVitamin C, vitamin E, and hexanal are added to the base coat composition (comprising: ethyl acetate, butyl acetate, polyvinyl butyral, bis-hema poly(1,4-butanediol)-9 / ipdi copolymer, p-toluenesulfonamide / epoxy resin, styrene / acrylate copolymer, trimethylbenzoylphenylphosphine ethyl ester, tributyl citrate, isopropanol, phosphoric acid, and BHT) in amounts of 0.05 wt.%, 0.05 wt.%, and 0.1 wt.%, respectively, based on the total weight of the final composition, to obtain the composition according to the invention.

[0093] More specifically, the following tests can be used to evaluate the stability of the products of the present invention: To test general stability: Each of compositions 1 to 8 mentioned in Table 1 was packaged in a glass bottle and stored in an oven at 50°C for one month. The color of each composition was then compared with Green Flash. TM The primer coating composition was compared with a reference control (composition 1 in Table 1), which did not contain an active ingredient.

[0094] Under the test conditions, after one month in an oven at 50°C, the color of each of compositions 2 to 7 showed a significant change compared to the reference control. As used herein, the term "significant change" refers to a visible color change in the composition, such as in conjunction with a cloudy visual appearance. Conversely, composition 8 according to the invention, with Green flash... TM The base coat composition did not exhibit any undesirable transformation compared to the reference composition. Therefore, the general stability of the composition according to the invention is similar to that of the reference control.

[0095] To test yellowing stability: Each of compositions 1 to 8 mentioned in Table 1 was packaged in a glass bottle, placed in an oven at 50°C, and kept at ambient temperature (20°C) for one month for a comparative stability study. This stability was evaluated visually (color / yellowing). Under the test conditions, the color and yellowing of each of compositions 2 to 7 showed significant changes compared to the reference control composition 1. The results show that composition 8 according to the invention exhibits good stability compared to Green flash. TM The base coat composition 1 does not exhibit any significant color or yellowing change. In fact, significant yellowing is visible in compositions 2 to 7, particularly in the compositions containing vitamin C and / or E. Therefore, the compositions according to the invention comprising vitamin C, vitamin E, hexanal, and monomer-free resins containing (one or more) oligomers along with (one or more) photoinitiators do not yellow under the test conditions.

[0096] To test the stability against deposition: the products packaged in glass bottles were placed in a 50°C oven and then at ambient temperature (20°C) for one month for a comparative stability study. This stability was evaluated visually (the presence of particles at the bottom of the bottle). A pearly hue was particularly suitable for this type of monitoring. At the end of the test, each of compositions 1 to 7 had numerous particles in the bottle, unlike composition 8 of the present invention. Therefore, the compositions of the present invention are stable and do not exhibit deposition instability.

[0097] When with Green flash TM Compared to the base coat composition, the composition according to the invention is stable and does not undergo any undesirable transformation.

[0098] The same experiment was performed with component amounts outside the % range for vitamin C, vitamin E, and hexanal. The results showed that for percentages outside the range, the formulation balance was altered, causing instability of the composition over time.

[0099] When the amounts of vitamin C, vitamin E, and hexanal are outside these ranges, the composition exhibits numerous deposited particles, yellowing, and loss of photocurability under the conditions described in the tests.

[0100] The experimental results show that specific components of vitamin C, vitamin E, and hexanal, in specific weight percentages, together with a monomer-free resin containing oligomers along with one or more photoinitiators, constitute a stable nail care base coat composition with photocurable properties and no significant risk of allergic reactions to users.

[0101] In addition, specific amounts of active ingredients allow for nail care while increasing the stability of the composition.

[0102] The nail base coat composition of the present invention provides a strengthening, stable, hypoallergenic, and caring composition for nails, and is a good alternative to existing light-curable nail compositions.

Claims

1. A nail base coating composition having photocurable properties, characterized in that, It includes, as active ingredients, between 0.04 and 0.1 wt.% vitamin C, between 0.04 and 0.1 wt.% vitamin E, and between 0.08 and 0.12 wt.% hexanal, based on the total weight of the composition; and at least one monomer-free resin, preferably a methacrylate-free monomer-free resin, said monomer-free resin comprising one or more oligomers together with one or more photoinitiators.

2. The composition according to claim 1, wherein, Based on the total weight of the composition, the content of vitamin C is 0.05 wt.%, the content of vitamin E is 0.05 wt.%, and the content of hexanal is 0.1 wt.%.

3. The composition according to any one of claims 1 or 2, wherein, The composition includes at least one solvent, at least one film-forming agent, at least one plasticizer, at least one resin, and optionally a rheology modifier.

4. The composition according to claim 3, wherein, The at least one solvent is an organic solvent, preferably ethyl acetate and / or butyl acetate and / or at least one alcohol selected from ethanol, isopropanol and butanol.

5. The composition according to any one of claims 3 or 4, wherein, The at least one film-forming agent is a cellulose film-forming agent, preferably selected from nitrocellulose, carboxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cellulose acetate butyrate and / or cellulose acetate propionate, or polyvinyl butyral.

6. The composition according to any one of claims 3 to 5, wherein, The at least one plasticizer is tributyl citrate.

7. The composition according to any one of claims 3 to 6, wherein, The at least one monomer-free resin is selected from polyvinyl butyral resin, shellac resin, elemi resin, alkyd resin, polyester resin; p-toluenesulfonamide / epoxy resin; epoxy resin; acrylate resin; styrene-acrylate resin; polyurethane resin; sucrose benzoate; p-toluenesulfonamide / formaldehyde resin, toluenesulfonamide / formaldehyde resin, or polymers and / or copolymers of these various resins.

8. The composition according to any one of the preceding claims, wherein, The photoinitiator is selected from the group consisting of: benzoin methyl ether (BME), benzoin ethyl ether (BEE), benzoin isobutyl ether (BIE), benzoin benzyl ether (BBE), camphorquinone (CQ), Irgacure 819™ (phenyl bis(2,4,6-trimethylbenzoyl)phosphine oxide), Irgacure 184™ (1-hydroxycyclohexylphenyl ketone), Darocur 1173™ (2-hydroxy-2-methyl-1-phenyl-propane-1-one), Lucirin TPO™ (2,4,6-trimethylbenzoyl-diphenyl-phosphine oxide), Darocur 4265™ (tris(2-hydroxyethyl)isocyanurate triacrylate), thioxanone, benzoin O-ethyl ether (BOEE), ethyl 4-dimethylaminobenzoate (EDMAB), and ethyl trimethylbenzoylphenylphosphinate (TPO), or mixtures thereof.

9. The composition according to any one of the preceding claims, wherein, The composition further includes pigments or dyes.

10. The composition according to any one of claims 1 to 9, wherein, The composition does not contain any pigments or dyes.

11. A method for manufacturing a nail base coating composition according to any one of the preceding claims, comprising the following steps: The mixture and at least one monomer-free resin are added to the composition for use as a primer coating, the mixture comprising, based on the total weight of the mixture, between 0.04 and 0.1 wt.% vitamin C, between 0.04 and 0.1 wt.% vitamin E, and between 0.08 and 0.12 wt.% hexanal, the at least one monomer-free resin comprising one or more oligomers together with one or more photoinitiators, and the composition for use as a primer coating comprising at least one solvent, at least one film-forming agent, and at least one plasticizer.

12. The method according to claim 12, wherein the method is carried out at a temperature below 35°C, preferably at room temperature.

13. A method for applying a nail base coat composition according to any one of claims 1 to 11 to a user's nail, the method comprising the steps of: a) Applying the nail base coat composition to the nail; b) Curing the nail base coating composition using UV or LED light; as well as c) Optionally apply at least one layer of other nail product.

14. A method for removing nail care product compositions according to any one of claims 1-11 from nails, comprising the following steps: a) Soak each nail in the acetone-free nail polish remover composition for at least 1 minute; b) Rub sideways and away from the skin to remove residue from the nail.

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