GEL device for the diffusion of at least one volatile active ingredient, a method of delivering at least one volatile active ingredient by means of a GEL device and a diffuser gel

Abstract

Gel device for the diffusion of at least one volatile active ingredient, to a method of delivering at least one volatile active ingredient by means of a gel device and to a diffuser gel The invention refers to a gel device (1) for the diffusion of at least one volatile active ingredient (8) comprising: - a container (2), made from a naturally derived and degradable material, - a diffuser gel (6) contained in the container and behaving as a solid according to test standard ASTM D4359, - with the diffuser gel (6) comprising a gel matrix (7) having at least one volatile active ingredient (8), - with the container (2) having at least one area of exchange (3) that is suitable and / or designed to release the at least one volatile active ingredient (8) into the environment of the device (1).

Description

[0001] Description

[0002] GEL DEVICE FOR THE DIFFUSION OF AT LEAST ONE VOLATILE ACTIVE INGREDIENT, A METHOD OF DELIVERING AT

[0003] LEAST ONE VOLATILE ACTIVE INGREDIENT BY MEANS OF A GEL DEVICE AND A DIFFUSER GEL

[0004] The invention refers to a gel device for the diffusion of at least one volatile active ingredient. The invention further refers to a method of delivering at least one volatile active ingredient by means of a gel device and to a diffuser gel.

[0005] Devices for the diffusion of volatile active ingredients, such as for example air fresheners, insect repellents, and pheromone dispensers, are commonly used in both domestic and commercial environments. These devices typically consist of a container housing a gel matrix that holds and gradually releases the active ingredients into the surrounding air. The gel matrix often comprises a mixture of polymers and solvents that ensure a controlled and sustained release of the volatile compounds.

[0006] Traditionally, the containers for these gel-based diffusers are made from materials such as plastics and metals, including aluminum. Plastics, especially, are favored for their versatility, durability, and cost-effectiveness. They can be easily molded into various shapes and sizes, making them suitable for mass production and a wide range of design options. Metals like aluminum are used for their sturdiness and ability to provide a barrier against environmental factors that might degrade the active ingredients.

[0007] However, the widespread use of plastic containers poses significant environmental challenges. Plastics are predominantly derived from petrochemicals, which are nonrenewable resources. The production process of plastics is highly energy-intensive and contributes to greenhouse gas emissions. Moreover, plastics are notorious for their longevity in the environment, often taking hundreds of years to decompose. During their degradation process, plastics break down into smaller particles known as microplastics. These microplastics have been found to contaminate water bodies, soil, and even the air, posing severe risks to wildlife and human health. They can enter the food chain, causing a range of health issues, from physical blockages in animals to potential toxic effects in humans.

[0008] Aluminum, while being recyclable, still presents environmental concerns. The extraction and processing of aluminum ore (bauxite) are energy-intensive and result in significant environmental degradation, including deforestation, soil erosion, and water pollution. Although recycling aluminum reduces the environmental footprint, it is not always practiced to the extent necessary to mitigate its overall impact.

[0009] It is therefore an objective of the present invention to avoid the above-mentioned disadvantages and to provide an alternative for a gel device which not only allows an effective distribution of active ingredients, but is also in line with the values of sustainability and environmental protection.

[0010] The above object is solved by means of the independent claims. Advantageous further embodiments of the invention are disclosed in the dependent claims, the description and the accompanying figures.

[0011] According to claim 1 a gel device for the diffusion of at least one volatile active ingredient comprises:

[0012] - a container, made from a naturally derived and degradable material,

[0013] - a diffuser gel contained in the container and behaving as a solid according to test standard ASTM D4359, with the diffuser gel comprising a gel matrix having at least one volatile active ingredient, and with the container having at least one area of exchange that is suitable and / or designed to release the at least one volatile active ingredient into the environment of the device.

[0014] With such a configuration, it is not only advantageously ensured that the active ingredient is effectively and controllably released into the environment, but also that almost the entire device, particularly the entire container which builds the main part of the device, is manufactured in an environmentally friendly manner. By using naturally derived and degradable materials for the container, the use of environmentally harmful materials such as plastics or aluminum can be avoided. This reduces the burden of microplastics, which often arise from the degradation of plastics and have harmful effects on ecosystems and human health. Additionally, biodegradable materials are generally less energy-intensive to produce and leave a smaller carbon footprint, contributing to the fight against climate change. The degradability of the container ensures that the device can be easily disposed of after use, without lingering in landfills or the environment for long periods. This leads to higher acceptance among environmentally conscious consumers who increasingly value sustainable and eco- friendly products. Overall, the invention promotes the development of modern, environmentally friendly, and consumer-acceptable devices that meet the growing demands for sustainability and environmental protection.

[0015] The term "naturally derived" in the present context means that the material is sourced from natural origins and is naturally degradable, thereby explicitly excluding petrochemical materials. Furthermore, the term "degradable" in the present context means that materials can be broken down by natural processes, including biological, physical, and chemical processes. These processes occur in nature and encompass actions such as for example the decomposition by microorganisms, exposure to light, and interaction with water and other environmental factors. Thus, the term "degradable" explicitly includes "naturally degradable" and "biologically degradable.

[0016] Furthermore, a diffuser gel contained in the container and behaving as a solid according to test standard ASTM D4359 provides a crucial prerequisite for using such environmentally friendly and sustainable devices or containers. As demonstrated by the inventor's tests and experiments, this ensures that the container walls, when made from a naturally derived and degradable material, do not absorb the diffuser gel. This advantageously ensures that the integrity of the diffuser gel and the volatile active ingredients is maintained, preventing any unwanted contamination or loss through the container wall. The strength and stability of the gel, according to ASTM D4359, reliably prevent the container or container wall from becoming soaked or deformed. This ensures the long-term stability and effectiveness of the device, which is important for marketing and sales, and is a key aspect of the present invention, as it significantly improves the practicality and reliability of environmentally friendly diffuser devices. This is particularly successfully achieved with a preferred embodiment, wherein the naturally derived and degradable material is suitable and / or adapted to prevent the absorption of the diffuser gel and / or the diffusion of the diffuser gel and / or the at least one volatile active ingredient through the container wall. This helps to prevent the absorption of the diffuser gel by and / or the diffusion of the diffuser gel through the container wall. Thus, by specifically selecting suitable naturally derived and degradable materials, it is advantageously ensured that the integrity of the diffuser gel and the volatile active ingredients is maintained, preventing any unwanted contamination or loss through the container wall.

[0017] According to a particularly preferred embodiment, it is provided that the naturally derived and degradable material is a cellulose-based and / or natural material. This ensures that the container is made from renewable and environmentally friendly resources, enhancing the sustainability of the product. For example, it may be provided that the cellulose-based material is cellulose and / or paper and / or cardboard and / or carton. These readily accessible and available materials allow to produce containers that are easily recyclable and biodegradable.

[0018] This is also achieved with an optional embodiment, wherein the natural material is wood and / or natural fibers and / or bamboo and / or cork and / or plant fibers and / or mushroom-based materials and / or biodegradable polymers of natural origin and / or natural rubber, and / or composites made from these materials. Examples of natural fibers are cotton, linen, hemp, jute, and / or sisal. An example of bamboo is bamboo fibers. An example of cork is natural cork. Examples of plant fibers are coconut fibers, flax, and / or rattan. An example of mushroom-based materials is mycelium-based composites. Examples of biodegradable polymers of natural origin are polylactic acid (PLA), polyhydroxyalkanoates (PHA), and / or starch-based plastics. An example of natural rubber is latex. This versatility in material choice allows for the use of a wide range of environmentally friendly and sustainable materials, which enhances the eco- friendliness of the product.

[0019] According to another particularly preferred embodiment, it is provided that the device is a portable device. This ensures that the device can be easily transported and used in various environments. The portability of the device enhances its convenience and utility, making it suitable for a wide range of applications, from household use to travel purposes.

[0020] According to a particularly preferred embodiment, the container comprises or builds at least one receiving chamber in which the gel matrix with the at least one volatile active ingredient is contained, and wherein the receiving chamber is in communication with the at least one area of exchange to allow the release of the at least one volatile active ingredient into the environment. This specific construction ensures that the volatile active ingredient can be efficiently and controllably released into the environment, enhancing the effectiveness and reliability of the gel device.

[0021] According to another preferred embodiment, the container comprises or builds at least two receiving chambers, which are separated from each other. The separation preferably occurs by means of a simple container separation wall, which is part of the container. In this optional embodiment, the container thus comprises multiple separated receiving chambers or compartments, each filled with a diffuser gel. The diffuser gel in the multiple receiving chambers can have the same composition or alternatively different compositions, allowing for various combinations. For example, three receiving chambers can be provided, each filled with a diffuser gel of the same composition or with different diffuser gels. In another example, with three receiving chambers, two could be filled with a diffuser gel of the same composition while the third contains a diffuser gel of a different composition. The advantages of this design include the ability to use different gels for different purposes. In covered containers, there is the possibility to design the cover in such a way that the receiving chambers can be opened one by one over time. This staggered opening allows for controlled release and prolonged effectiveness of the active ingredients.

[0022] Fundamentally, the container and thus the device can have any desired shape and design. A particularly simple and functionally reliable embodiment proposes that the container is designed in a box-like manner and builds the at least one receiving chamber for accommodating the gel matrix. This further ensures that the container provides a stable and efficient structure for housing the gel matrix, facilitating the manufacture and the handling of the device. According to another advantageous embodiment, it is provided that the at least one area of exchange is formed by at least one container opening. This provides a clearly defined and easily constructed area of exchange, facilitating the design and manufacture of the container.

[0023] The gel device can be generally designed to be open due to the diffuser gel contained in the container and behaving as a solid according to test standard ASTM D4359, and thus does not necessarily require a cover to enclose the at least one area of exchange or the at least one container opening. For this reason, the gel device itself can form an independent sales unit, where the container itself may be labeled on its visible outer wall with the appropriate sales markings (barcode, ingredients, data, product name and brand, expiration date, warnings and safety instructions, usage instructions, recycling and disposal information, manufacturer information, quantity or volume, product or serial number, certifications and seals, country of origin, etc.). Alternatively, the gel device can also be packaged in a simple outer packaging, such as a pouchlike wrapper made of any suitable material, for example, a degradable plastic film or foil. In this case, the gel device along with its outer packaging constitutes the sales unit.

[0024] However, according to another preferred embodiment, it can be provided that the at least one area of exchange is covered by at least one removable cover, which is suitable and / or adapted to releasably seal the at least one area of exchange and, when removed, to expose at least a portion of the at least one area of exchange to allow the release of the at least one volatile active ingredient into the environment. This ensures that the volatile active ingredients are only released from the container when the cover is at least partially removed from the area of exchange. This prevents unnecessary loss of the active ingredients and allows for better control over their release. This cover can be made from any suitable material, whether degradable or not, although the use of a degradable material is naturally preferred. For example, the cover could be made from environmentally friendly materials, like for example from naturally derived and degradable materials, to further enhance the sustainability of the entire device.

[0025] Further, it can be optionally provided that the at least one container opening is sealed by a diffusion-controlling first cover, which is further covered by the removable cover as a second cover. The first cover can be designed in the form of a membrane or a similar device. A membrane cover could be microporous, controlling the diffusion of the volatile active ingredient by regulating the passage rate. Such a membrane cover could be made from any suitable material, for example could be made from materials like polytetrafluoroethylene (PTFE), polyethylene (PE), or other polymeric membrane materials known for their ability to regulate molecule diffusion. Also, the membrane cover could be made from naturally derived and degradable materials, such as polylactic acid (PLA), polyhydroxyalkanoates (PHA), or other bio-based polymers. All these materials are suitable for regulating molecule diffusion and, when using naturally derived and degradable materials, are also environmentally friendly. Using a diffusioncontrolling cover ensures that the volatile active ingredient is released at a uniform and controlled rate, enhancing the effectiveness and efficiency of the diffuser gel. This also prevents the active ingredient from being released too quickly or uncontrollably, which can extend the product's usage life. The removable second cover provides additional protection against unintentional leakage of the gel or the active ingredient during storage or transport. It can be easily removed to expose the first cover and enable controlled diffusion. This ensures that the gel device is safe and user-friendly, allowing it to be activated and deactivated as needed. As mentioned before, the second cover could also be made from any suitable material, for example could be made from environmentally friendly materials, like for example from naturally derived and degradable materials, to further enhance the sustainability of the entire device.

[0026] According to a particularly preferred embodiment, it is specified that the container has a wall thickness of 0.1 mm to 4.0mm. The thicker the wall, the better the container is protected against unwanted absorption.

[0027] In a preferred, but optional embodiment of the gel device, the gel matrix could comprise a polymer basis as gelling agent, with the polymer basis being preferably at least one of polyamide, polyacrylate, polyurethane, polyvinyl alcohol (PVA), and / or polyethylene oxide (PEO). The term "polymer basis" refers to the primary structure or main component of the gel matrix, which may consist of one or more types of polymers. This polymer basis is able to define the physical and chemical properties of the gel, such as its strength, elasticity, and viscosity. Each of these polymers might contribute unique characteristics to the gel matrix: Polyamide, for example, is known for its strength and durability, making it suitable for applications requiring robust mechanical properties. Polyacrylate polymers are flexible and water-soluble, which makes them ideal for use in gels. Polyurethane is versatile and elastic. Polyvinyl alcohol is water-soluble and film-forming. Polyethylene oxide is known for its water solubility and biocompatibility. The polymer basis might not only provide the structural backbone of the gel matrix but also play a pivotal role in ensuring that the matrix can effectively carry and release the volatile active ingredients. By choosing different polymers for the basis, the properties of the gel matrix could be tailored to meet specific needs, such as controlling the release rate of active ingredients, maintaining stability under various temperatures, and achieving desired mechanical properties. In summary, the polymer basis is fundamental to the function and characteristics of the gel matrix within the gel device, offering versatility and adaptability to meet diverse application requirements.

[0028] In another advantageous embodiment, the gel matrix comprises a gelling agent in the amount of 5 to 90% by mass of the total mass of the diffuser gel, preferably in the amount of 5 to 60% by mass of the total mass of the diffuser gel. This specific concentration range ensures that the gel maintains sufficient viscosity and structural integrity to encapsulate the volatile active ingredients and release them in a controlled manner. By optimizing the gelling agent concentration within this range, the gel achieves a balance between firmness and flexibility, preventing it from becoming too brittle or too fluid. This careful adjustment is crucial for ensuring that the gel device performs as intended, providing a steady and reliable diffusion of the active ingredients.

[0029] Furthermore, the gel matrix may further comprise an organic solvent, with the preferred organic solvent being at least one of benzyl acetate, dipropylene glycol methyl ether, tripropylene glycol methyl ether, and / or combinations thereof. The inclusion of an organic solvent is important for dissolving and stabilizing the volatile active ingredients within the gel matrix. These solvents are particularly effective in this role, providing excellent solubility and maintaining the homogeneity of the gel. By incorporating an organic solvent, the gel matrix ensures that the active ingredients are uniformly distributed and readily available for diffusion, enhancing the efficacy of the gel device. According to a preferred embodiment, the gel matrix comprises an organic solvent in the amount of 5 to 95% by mass of the total mass of the diffuser gel, most preferably in the amount of 20 to 40% by mass of the total mass of the diffuser gel. This concentration is advantageous as it provides optimal solubility and stability of the volatile active ingredients, ensuring consistent performance and effectiveness of the gel device throughout its lifecycle.

[0030] Moreover, the gel matrix may further include a preservative, preferably butylated hydroxytoluene (BHT). The addition of a preservative is essential for extending the shelf life of the gel by preventing microbial contamination. Butylated hydroxytoluene (BHT) acts as antioxidant and is a highly effective preservative that ensures the gel remains free from bacteria, mold, and other microorganisms. This not only prolongs the usability of the gel device but also maintains the integrity and safety of the volatile active ingredients, ensuring consistent performance throughout the product's lifecycle. According to a preferred embodiment, the gel matrix comprises a preservative in the amount of 0.1 to 3% by mass of the total mass of the diffuser gel, most preferably in the amount of 0.1 to 1 % by mass of the total mass of the diffuser gel. This concentration range is advantageous as it provides optimal preservation efficacy without compromising the physical properties of the gel, ensuring a balanced formulation that is both effective and stable.

[0031] In a further preferred embodiment, the gel matrix may further comprise a dye, preferably a food-grade dye. The incorporation of a dye enhances the visual appeal of the gel, making it more attractive and recognizable to consumers. Using a food-grade dye ensures that the coloration is safe and non-toxic, even if accidental contact with food or skin occurs. This consideration is particularly important for consumer acceptance and safety, providing an aesthetically pleasing product without compromising health standards. According to a preferred embodiment, the gel matrix comprises a dye in the amount of 0.001 to 3% by mass of the total mass of the diffuser gel, most preferably in the amount of 0.01 to 0.1 % by mass of the total mass of the diffuser gel. This concentration range is advantageous as it provides sufficient coloration to enhance the gel's visual appeal while maintaining safety and non-toxicity, ensuring the product remains attractive and consumer-friendly without health risks.

[0032] Additionally, the gel matrix may comprise a bittering agent, with denatonium benzoate being the preferred choice. The inclusion of a bittering agent serves as a deterrent against accidental ingestion of the gel. Denatonium benzoate is known for its extremely bitter taste, which discourages consumption and enhances the safety of the product. This feature is particularly important in households with children or pets, providing an additional layer of protection against accidental ingestion. According to a preferred embodiment, the gel matrix comprises a bittering agent in the amount of 0.003 to 3% by mass of the total mass of the diffuser gel, preferably in the amount of 0.003 to 0.08% by mass of the total mass of the diffuser gel. This concentration range is advantageous as it provides an effective deterrent taste without affecting the overall performance or stability of the gel, ensuring both safety and functionality are maintained.

[0033] According to another preferred embodiment, the gel matrix comprises at least one volatile active ingredient in the amount of 0.5 to 95% by mass of the total mass of the diffuser gel, preferably from 5 to 90% by mass of the total mass of the diffuser gel, most preferably from 10 to 90% by mass of the total mass of the diffuser gel. This concentration range ensures that there is a sufficient quantity of the active ingredient to achieve effective diffusion into the surrounding environment. By optimizing the amount of the volatile active ingredient within this range, the gel device is capable of providing a consistent and long-lasting release of the active compounds, enhancing the overall efficacy of the product. Especially in the case of insecticides the dosage can be very small.

[0034] Furthermore, the at least one volatile active substance can be at least one of a fragrance, an insecticide, a biocidal active ingredient, and / or a pheromone, and / or combinations thereof, that is suitable and / or adapted to diffuse into the air at room temperature. The term “active” is therefore in no way restrictive, but merely means that the ingredient can be released from the diffuser gel respectively gel matrix due to its volatility. This flexibility allows the gel device to be tailored for various applications, whether it is for ambient scenting, pest control, or influencing animal behavior. The ability to release these active substances at room temperature ensures that the device is convenient and effective under typical usage conditions, providing versatile and practical solutions for consumers.

[0035] According to another preferred embodiment, the diffuser gel has a dropping point from 50°C to 190°C, preferably from 90°C to 100°C. This thermal stability range ensures that the gel remains solid under normal and moderately elevated environmental conditions, preventing unintended melting or deformation. By maintaining its structural integrity within this temperature range, the gel device is reliable and effective, ensuring that the active ingredients are released in a controlled manner without compromising the gel's consistency or performance.

[0036] According to another preferred embodiment, the diffuser gel preferably contains less than 2% water by mass of the total mass of the diffuser gel. This low water content is beneficial for enhancing the stability and longevity of the gel, reducing the risk of microbial growth and ensuring that the volatile active ingredients are not prematurely evaporated or degraded. By minimizing the water content, the gel device can maintain its efficacy and safety over an extended period, providing consistent performance for consumers.

[0037] It goes without saying that the individual ingredients, which refer to the “total mass of the diffuser gel” or the “total mass of the diffuser gel”, must always add up to 100%. The selection of ingredients is made accordingly.

[0038] Furthermore, it can be advantageous that the diffuser gel has a compression strength from 50 to 400 mN, preferably from 100 to 300 mN. This range of compression strength indicates that the gel is sufficiently firm to maintain its shape and withstand handling during use and transport, yet flexible enough to adapt to slight pressure changes. This balance ensures that the gel is durable and user-friendly, maintaining its functional integrity throughout its lifecycle.

[0039] Furthermore, it is preferred that the diffuser gel has an elasticity modulus of 50 to 800 KPa, preferably from 100 to 400 KPa. This range ensures that the gel possesses the appropriate degree of elasticity to respond to mechanical stresses without breaking or deforming. By maintaining an elasticity modulus within this range, the gel can adapt to various environmental conditions and mechanical manipulations, providing a resilient and durable structure. This characteristic is good for maintaining the integrity of the gel during handling, transportation, and use, ensuring consistent performance over the product's lifecycle. Furthermore, an elasticity modulus in this range indicates that the gel has the flexibility to absorb and dissipate energy from impacts or pressure changes, which is essential for preventing damage to the gel matrix and the embedded volatile active ingredients. This property enhances the overall robustness of the gel device, making it suitable for various applications where durability and resilience are required. Additionally, the specified elasticity modulus supports the controlled release of the volatile active ingredients. A gel with the right balance of flexibility and firmness can maintain its structural integrity while allowing for the gradual and consistent diffusion of the active components. This ensures that the desired effect, whether it be fragrance diffusion, biocidal activity, or pheromone release, is achieved over an extended period. Thus, by designing the gel to have an elasticity modulus of 50 to 800 KPa, preferably from 100 to 400 KPa, the device offers a reliable and effective solution for delivering volatile active ingredients in a controlled and sustainable manner. This enhances the user experience by providing a product that is both efficient and long-lasting, meeting the demands of modem consumers for high-quality and resilient products.

[0040] The above object is further solved by a method of delivering at least one volatile active ingredient by means of a gel device as described above, which comprises the following steps:

[0041] - providing a container, made from a naturally derived and degradable material,

[0042] - providing a diffuser gel in the container, with the diffuser gel behaving as a solid according to test standard ASTM D4359,

[0043] - with the diffuser gel comprising a gel matrix having at least one volatile active ingredient,

[0044] - with the container having at least one area of exchange that is suitable and / or designed to release the at least one volatile active ingredient into the environment of the device.

[0045] The resulting advantages are identical to the above-mentioned advantages of the gel device, so to avoid repetition, reference is made to the above explanations.

[0046] The above object is further solved by a diffuser gel being suitable and / or adapted:

[0047] - to behave as a solid according to test standard ASTM D4359, with the diffuser gel comprising a gel matrix having at least one volatile active ingredient,

[0048] - to be contained in a container, made from a naturally derived and degradable material. Here too, it is pointed out that the resulting advantages are identical to the above- mentioned advantages of the diffuser gel of the gel device, so to avoid repetition, reference is made to the above explanations.

[0049] Exemplary embodiment accordinq to the invention

[0050] An exemplary embodiment of the gel device according to the invention was tested in two stages to determine the behavior of the diffuser gel and its interaction with a naturally derived and degradable container.

[0051] Stage 1 : Testing the Diffuser Gel

[0052] Objective: To determine whether the diffuser gel behaves as a solid or liquid according to test standard ASTM D4359.

[0053] Composition of the Diffuser Gel: a) Gel Matrix:

[0054] • Gelling Agent: Polyether block amide (20% by mass of the total mass of the diffuser gel)

[0055] • Organic Solvent: Tripropylene glycol methyl ether (29.86% by mass of the total mass of the diffuser gel)

[0056] • Preservative: Benzoisothiazolinone (0.06% by mass of the total mass of the diffuser gel)

[0057] • Dye: Food-grade dye (trace amount of 0.005% by mass of the total mass of the diffuser gel)

[0058] • B ittering Agent: Denatonium benzoate (0.075% by mass of the total mass of the diffuser gel) b) Volatile Active Ingredient:

[0059] • Fragrance: Lavender essential oil (50% by mass of the total mass of the diffuser gel)

[0060] Test Procedure:

[0061] 1. Material Preparation: The gel matrix (quantity of 11 for ASTM D4359), comprising the volatile active ingredient, was placed in a sealed container and heated in an oven maintained at 38°C for 18 to 24 hours to reach thermal equilibrium.

[0062] 2. Inversion Test: After thermal equilibrium, the container was inverted over a tarred watch glass. The distance the material flowed from the lip of the container was measured after 3 minutes. If the material flowed more than 50 mm or if more than 1 g of material was collected on the watch glass, it was considered a liquid. Otherwise, it was considered a solid. The distance from the surface of the material inside the can to the top edge (lip) of the can was measured before and after heating to check for any changes in the material’s volume.

[0063] Test Results:

[0064] • Oven Time: 1290 minutes at 38°C.

[0065] • Initial Distance (sample surface to lip of can): 20 mm.

[0066] • Post-heating Distance (sample surface to lip of can): 20 mm.

[0067] • Flow Distance: 0 mm.

[0068] • Material Collected on Watch Glass: 0 grams.

[0069] Conclusion:

[0070] The test concluded that the gel matrix behaved as a solid under the test conditions. No flow was observed, and no material was collected on the watch glass within the 3- minute test duration, confirming that the gel matrix in the container is classified as a solid according to ASTM D4359.

[0071] Stage 2: Testing the Interaction with the container

[0072] Objective: To check if the container made from a naturally derived and degradable material absorbs the solidified diffuser gel or allows the diffusion of the volatile active ingredient through the container wall.

[0073] Composition of the Container Material:

[0074] • Material: Carton (made from recycled paper fibers)

[0075] Test Procedure:

[0076] 1 . Container Preparation: A container made from carton was used. The container had the following specifications: o Wall thickness: 0.5 mm o Volume: 10 ml

[0077] 2. Filling the Container: The solidified diffuser gel from Stage 1 was placed into the carton container. The container was sealed and subjected to the following conditions: o Temperature: 38°C (to simulate room temperature conditions and slight thermal stress) o Duration: 30 days

[0078] 3. Observation and Measurement: The container was regularly checked for any signs of absorption or diffusion of the gel. The following parameters were monitored: o Weight of the container (to detect any loss of volatile ingredients) o Visual inspection for any deformation or discoloration of the container walls o Measurement of the surface-to-lip distance to detect any volume change in the gel

[0079] Test Results:

[0080] • Weight Loss: 0 grams (indicating no significant evaporation of the volatile ingredient)

[0081] • Visual Inspection: No visible signs of absorption, deformation, or discoloration of the container walls

[0082] • Surface-to-Lip Distance: Consistent measurements, indicating no volume change in the gel

[0083] Conclusion:

[0084] The test demonstrated that the carton container did not absorb the solidified diffuser gel or allow the diffusion of the volatile active ingredient through the container wall. This confirmed that the naturally derived and degradable material is suitable for use in a gel device according to the invention, maintaining the integrity of the diffuser gel and preventing any unwanted contamination or loss through the container wall. Overall conclusion:

[0085] This detailed exemplary embodiment illustrates both the preparation and testing of the diffuser gel and its interaction with a biodegradable carton container, ensuring the reliability and environmental benefits of the invention.

[0086] An exemplary comparative embodiment of the gel device was tested to demonstrate the behavior of a diffuser gel that does not behave as a solid according to ASTM D4359, and its interaction with a naturally derived and degradable container.

[0087] Stage 1 : Testing the Diffuser Gel

[0088] Objective: To determine whether the modified diffuser gel behaves as a solid or liguid according to test standard ASTM D4359.

[0089] Composition of the Diffuser Gel: a) Gel Matrix:

[0090] • Gelling Agent: Carrageenan (1 ,5% by mass of the total mass of the of the total mass of the diffuser gel)

[0091] • Organic Solvent: Isopropanol (4% by mass of the total mass of the diffuser gel)

[0092] • Organic Solvent: Dipropylene glycol methyl ether (20% by mass of the total mass of the diffuser gel)

[0093] • Solvent: Demineralized water (68.18% by mass of the total mass of the diffuser gel)

[0094] • Preservative: 1 ,2-Benzisothiazolin-3-on (BIT) (0.18% by mass of the total mass of the diffuser gel)

[0095] • pH Adjuster I Chelating agent: Citric acid (0.05% by mass of the total mass of the diffuser gel)

[0096] • Dye: Food-grade dye (trace amount of 0.01 % by mass of the total mass of the diffuser gel)

[0097] • Bittering Agent: Denatonium benzoate (0.08% by mass of the total mass of the diffuser gel) b) Volatile Active Ingredient:

[0098] • Fragrance: Lavender (6% by mass of the total mass of the diffuser gel) Test Procedure:

[0099] 1. Material Preparation: The gel matrix (quantity of 11 for ASTM D4359), comprising the volatile active ingredient, was placed in a sealed container and heated in an oven maintained at 38°C for 18 to 24 hours to reach thermal equilibrium.

[0100] 2. Inversion Test: After thermal equilibrium, the container was inverted over a tarred watch glass. The distance the material flowed from the lip of the container was measured after 3 minutes. If the material flowed more than 50 mm or if more than 1 g of material was collected on the watch glass, it was considered a liquid. Otherwise, it was considered a solid. The distance from the surface of the material inside the can to the top edge (lip) of the can was measured before and after heating to check for any changes in the material’s volume.

[0101] Test Results:

[0102] • Oven Time: 1290 minutes at 38°C.

[0103] • Initial Distance (sample surface to lip of can): 20 mm.

[0104] • Post-heating Distance (sample surface to lip of can): 20 mm.

[0105] • Flow Distance: 60 mm.

[0106] • Material Collected on Watch Glass: 2 grams.

[0107] Conclusion:

[0108] The test concluded that the gel matrix behaved as a liquid under the test conditions. The material flowed significantly, and more than 1 g of material was collected on the watch glass within the 3-m inute test duration, confirming that the gel matrix in the container is classified as a liquid according to ASTM D4359.

[0109] Stage 2: Testing the Interaction with the container

[0110] Objective: To check if the container made from a naturally derived and degradable material absorbs the liquid diffuser gel or allows the diffusion of the volatile active ingredient through the container wall.

[0111] Composition of the Container Material:

[0112] • Material: Carton (made from recycled paper fibers) Test Procedure:

[0113] 1. Container Preparation: A container made from carton was used. The container had the following specifications: o Wall thickness: 0.5 mm o Volume: 10 ml

[0114] 2. Filling the Container: The liquid diffuser gel from Stage 1 was placed into the carton container. The container was sealed and subjected to the following conditions: o Temperature: 38°C (to simulate room temperature conditions and slight thermal stress) o Duration: 30 days

[0115] 3. Observation and Measurement: The container was regularly checked for any signs of absorption or diffusion of the gel. The following parameters were monitored: o Weight of the container (to detect any loss of volatile ingredients) o Visual inspection for any deformation or discoloration of the container walls o Measurement of the surface-to-lip distance to detect any volume change in the gel

[0116] Test Results:

[0117] • Weight Loss: 1 grams (indicating significant evaporation of the volatile ingredient)

[0118] • Visual Inspection: Visible signs of absorption, deformation, and discoloration of the container walls

[0119] • Surface-to-Lip Distance: Decrease in measurements, indicating volume loss in the gel

[0120] Conclusion:

[0121] The test demonstrated that the carton container absorbed the liquid diffuser gel and allowed the diffusion of the volatile active ingredient through the container wall. This confirmed that a liquid diffuser gel is not suitable for use with a container made from a naturally derived and degradable material, as it led to unwanted contamination and loss through the container wall. This comparison emphasizes the importance of using a solidified diffuser gel together with a naturally derived and degradable material for a container.

[0122] The invention is further explained in more detail and by way of example only with reference to drawings. These drawings show:

[0123] Figure 1 shows a schematic side view of an exemplarily cuboid-shaped container of an exemplary portable gel device in an unused state, in which a container opening forming an area of exchange is tightly sealed by a removable cover 4;

[0124] Figure 2 shows a schematic longitudinal section through the container of the gel device of Figure 1 with the container opening partially uncovered by the partially removed removable cover, exposing the area of exchange;

[0125] Figure 3 shows a perspective top view of an exemplary container of a second embodiment of an exemplary portable gel device having two receiving chambers for diffuser gels, which are tightly sealed by a removable cover;

[0126] Figure 4 shows the container of the gel device of Figure 3, wherein the container opening of the first receiving chamber is uncovered, while the second receiving chamber is sealed by the partially removed removable cover.

[0127] Figure 1 shows a schematic side view of an exemplarily cuboid-shaped container 2 of an exemplary portable gel device 1 in an unused state. The container 2 is made from a naturally derived and degradable material, such as a cellulose-based, natural material, for example, cellulose, paper, cardboard, and / or carton. Alternatively, it can be made from wood, natural fibers, bamboo, cork, plant fibers, mushroom-based materials, biodegradable polymers of natural origin, natural rubber, and / or composites made from these materials.

[0128] The container 2 has an exemplary wall thickness of 2.0 mm. The container 2 has a container opening 3 that forms an area of exchange. This container opening 3 is tightly sealed by a removable cover 4, which is suitable and / or adapted to releasably seal the area of exchange and, when removed, to expose at least a portion of the area of exchange to allow the release of the volatile active ingredient into the environment (see Figure 2).

[0129] Figure 2 shows a schematic longitudinal section through the container 2 of Figure 1. In this figure, the container opening 3 is partially uncovered by the partially removed removable cover 4, exposing the area of exchange. Inside the container 2 is a receiving chamber 5 that accommodates the diffuser gel 6. The diffuser gel 6 is shown to behave as a solid according to test standard ASTM D4359. The gel matrix 7 within the diffuser gel 6 comprises at least one volatile active ingredient 8. The diffuser gel 6 has, for example, a compression strength between 50 to 400 mN and / or an elasticity modulus of 50 to 800 KPa.

[0130] The naturally derived and degradable material of the container 2 is suitable and / or adapted to prevent the absorption of the diffuser gel 6 and / or the diffusion of the diffuser gel 6 and / or the at least one volatile active ingredient 8 through the container wall.

[0131] Optionally, the at least one area of exchange, respectively container opening 3, can be further covered by a diffusion-controlling first cover 9, which is permeable to the volatile active ingredient 8 (see arrows in Figure 2). This first cover 9 is further covered by the removable cover 4 as a second cover (see Figure 1 ), ensuring that no diffusion takes place when the device is not in use. The removable cover 4 is for example a film or foil, preferably a degradable film or foil.

[0132] By structuring the gel device 1 this way, it is ensured that the volatile active ingredient 8 is effectively and controllably released into the environment while maintaining the environmental friendliness of the container 2, as it is made from a biodegradable and / or natural material. This also helps in avoiding the use of environmentally harmful materials such as plastics or aluminum, which reduces the burden of microplastics and promotes sustainability. This embodiment of the portable gel device 1 provides a reliable and eco-friendly solution for the controlled release of volatile active ingredients, meeting the growing demand for sustainable and environmentally friendly products.

[0133] Figures 3 and 4 show a perspective top view of an exemplary container 2 of a second embodiment of an exemplary portable gel device 1. The container 2 comprises or forms / builds several, in this exemplary case two, receiving chambers 5, which are separated from each other by means of a container separation wall 10 being part of the container 2. The container separation wall 10 is shown completely dashed in Figure 3 and only partially dashed in Figure 4.

[0134] In the initial state, the two receiving chambers 5 are tightly sealed by a removable cover 4 (Figure 3). Also here, the container 2 is made from a naturally derived and degradable material, such as a cellulose-based, natural material, for example, cellulose, paper, cardboard, and / or carton. Alternatively, it can be made from wood, natural fibers, bamboo, cork, plant fibers, mushroom-based materials, biodegradable polymers of natural origin, natural rubber, and / or composites made from these materials.

[0135] The container 2 has an exemplary wall thickness of 1 .5 mm.

[0136] Figure 4 shows the container 2 of the gel device 1 , wherein the container opening 3 of a first one of the receiving chambers 5 is uncovered, while a container opening 3 of a second one of the receiving chambers 5 is still sealed by the removable cover 4. This allows the filling of the receiving chambers 5 with different or the same diffuser gels 6, and the receiving chambers 5 can be opened sequentially. Also here, the diffuser gels 6 behave as a solid according to test standard ASTM D4359. The gel matrix 7 within the diffuser gels 6 comprises at least one volatile active ingredient 8. The diffuser gels 6 have, for example, a compression strength between 50 to 400 mN and / or an elasticity modulus of 50 to 800 KPa.

[0137] The cover 4 can here be made from the same material as the cover 4 of the embodiment shown in Figures 1 and 2. In contrast to the embodiment of Figures 1 and 2, no diffusion-controlling first cover 9 is provided here. List of reference symbols

[0138] 1 gel device

[0139] 2 container

[0140] 3 container opening (area of exchange)

[0141] 4 removable cover 5 receiving chamber

[0142] 6 diffuser gel

[0143] 7 gel matrix

[0144] 8 volatile active ingredient

[0145] 9 diffusion-controlling cover 10 container separation wall

Claims

Claims1. A gel device (1 ) for the diffusion of at least one volatile active ingredient (8) comprising:- a container (2), made from a naturally derived and degradable material,- a diffuser gel (6) contained in the container and behaving as a solid according to test standard ASTM D4359,- with the diffuser gel (6) comprising a gel matrix (7) having at least one volatile active ingredient (8),- with the container (2) having at least one area of exchange (3) that is suitable and / or designed to release the at least one volatile active ingredient (8) into the environment of the device (1 ).

2. A gel device according to claim 1 , wherein the naturally derived and degradable material is suitable and / or adapted to prevent the absorption of the diffuser gel (6) and / or the diffusion of the diffuser gel (6) and / or the at least one volatile active ingredient (8) through the container wall.

3. A gel device according to claim 1 or 2, wherein the naturally derived and degradable material is a cellulose-based and / or natural material.

4. A gel device according to claim 3, wherein the cellulose-based material is cellulose and / or paper and / or cardboard and / or carton.

5. A gel device according to claim 3 or 4, wherein the natural material is wood and / or natural fibers and / or bamboo and / or cork and / or plant fibers and / or mushroom-based materials and / or biodegradable polymers of natural origin and / or natural rubber, and / or composites made from these materials.

6. A gel device according to any one of the preceding claims, wherein the device (1 ) is a portable device.

7. A gel device according to any one of the preceding claims, wherein the container(2) comprises or builds at least one receiving chamber (5) in which the gel matrix(7) with the at least one volatile active ingredient (8) is contained, and wherein the receiving chamber (5) is in communication with the at least one area of exchange (3) to allow the release of the at least one volatile active ingredient(8) into the environment.

8. A gel device according to claim 7, wherein the container (2) comprises or builds at least two receiving chambers (5), which are separated from each other, preferably by means of a container separation wall (10) being part of the container.

9. A gel device according to claim 7 or 8, wherein the container (2) is designed in a box-like manner and builds the at least one receiving chamber (5) for accommodating the gel matrix (7).

10. A gel device according to any one of the preceding claims, wherein the at least one area of exchange (3) is formed by at least one container opening.11 . A gel device according to any one of the preceding claims, wherein the at least one area of exchange (3) is covered by at least one removable cover (4), which is suitable and / or adapted to releasably seal the at least one area of exchange(3) and, when removed, to expose at least a portion of the area of exchange (3) to allow the release of the at least one volatile active ingredient (8) into the environment.

12. A gel device according to claims 10 and 11 , wherein the at least one container opening is sealed by a diffusion-controlling first cover (9), which is further covered by the at least one removable cover (4) as a second cover.

13. A gel device according to any one of the preceding claims, wherein the container (2) has a wall thickness of 0.1 mm to 4.0mm.

14. A gel device according to any one of the preceding claims, wherein the gel matrix (7) comprises a polymer basis as a gelling agent, preferably with the polymer basis being at least one of polyamide, polyacrylate, polyurethane, polyvinyl alcohol (PVA), polyethylene oxide (PEO), and / or combinations thereof.

15. Agel device according to claim 14, wherein the gel matrix (7) comprises a gelling agent in the amount of 5 to 90% by mass of the total mass of the diffuser gel, preferably in the amount of 5 to 60% by mass of the total mass of the diffuser gel.

16. A gel device according to any one of the preceding claims, wherein the gel matrix (7) further comprises an organic solvent, preferably with the organic solvent being at least one of benzyl acetate, dipropylene glycol methyl ether, tripropylene glycol methyl ether, and / or combinations thereof, preferably in the amount of 5 to 95% by mass of the total mass of the diffuser gel, most preferably in the amount of 20 to 40% by mass of the total mass of the diffuser gel.

17. A gel device according to any one of the preceding claims, wherein the gel matrix (7) further comprises a preservative, preferably butylated hydroxytoluene (BHT) as a preservative, preferably in the amount of 0.1 to 3% by mass of the total mass of the diffuser gel, most preferably in the amount of 0.1 to 1% by mass of the total mass of the diffuser gel.

18. A gel device according to any one of the preceding claims, wherein the gel matrix (7) further comprises a dye, preferably a food-grade dye, preferably in the amount of 0.001 to 3% by mass of the total mass of the diffuser gel, preferably in the amount of 0.01 to 0.1 % by mass of the total mass of the diffuser gel.

19. A gel device according to any one of the preceding claims, wherein the gel matrix (7) comprises a bittering agent, preferably denatonium benzoate as bittering agent, preferably in the amount of 0.003 to 3% by mass of the total mass of the diffuser gel, most preferably in the amount of 0.003 to 0.08% by mass of the total mass of the diffuser gel.

20. A gel device according to any one of the preceding claims, wherein the gel matrix (7) comprises at least one volatile active ingredient (8) in the amount of 0.5 to 95% by mass of the total mass of the diffuser gel, preferably from 5 to 90% by mass of the total mass of the diffuser gel, most preferably from 10 to 90% by mass of the total mass of the diffuser gel.21 . A gel device according to any one of the preceding claims, wherein the at least one volatile active substance (8) is at least one of a fragrance, an insecticide, a biocidal active ingredient and / or a pheromone, and / or combinations thereof, that is suitable and / or adapted to diffuse into the air at room temperature.

22. A gel device according to any one of the preceding claims, wherein the diffuser gel (6) has a dropping point from 50°C to 190°C, preferably from 90°C to 100°C.

23. A gel device according to any one of the preceding claims, wherein the diffuser gel (6) contains less than 2% water by mass of the total mass of the diffuser gel (6).

24. A gel device according to any one of the preceding claims, wherein the diffuser gel (6) has a compression strength of 50 to 400 mN, preferably of 100 to 300 mN.

25. A gel device according to any one of the preceding claims, wherein the diffuser gel (6) has an elasticity modulus of 50 to 800 KPa, preferably of 100 to 400KPa.

26. A method of delivering at least one volatile active ingredient (8) by means of a gel device (1 ) according to any one of the preceding claims, comprising the steps of:- providing a container (2), made from a naturally derived and degradable material,- providing a diffuser gel (6) in the container (2), with the diffuser gel (6) behaving as a solid according to test standard ASTM D4359,- with the diffuser gel (6) comprising a gel matrix (7) having at least one volatile active ingredient (8),- with the container (2) having at least one area of exchange (3) that is suitable and / or designed to release the at least one volatile active ingredient (8) into the environment of the device (1 ).

27. A diffuser gel (6) being suitable and / or adapted:- to behave as a solid according to test standard ASTM D4359, with the diffuser gel (6) comprising a gel matrix (7) having at least one volatile active ingredient (8),- to be contained in a container (2), made from a naturally derived and degradable material.

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