WO2023111366A1

WO2023111366A1 - Medium for long-lasting fragrance

Info

Publication number: WO2023111366A1
Application number: PCT/ES2021/070892
Authority: WO
Inventors: Leonidas TORRECILLA GUMBAU; Marc SÁNCHEZ BOSCH; Alberto MAJOS CULLELL
Original assignee: Akewuele, S.L.
Priority date: 2021-12-15
Filing date: 2021-12-15
Publication date: 2023-06-22
Also published as: ES2977008A2

Abstract

The present invention relates to a medium for a long-lasting fragrance and to the method for producing same. The medium of the invention comprises at least: i) a polymer matrix containing: - an ethylene vinyl acetate copolymer, and - a polyethylene polymer; ii) a fragrance; and iii) an excipient, wherein the excipient is selected from a list consisting of benzyl benzoate and isopropyl myristate; wherein the fragrance is impregnated in the polymer matrix and wherein the excipient is present in the fragrance medium in a range of 1-35% by weight. Said medium can provide a controlled and sustained release over time, sufficient to create the desired fragrance in a large room or enclosed spaces, in containers or vessels suitable for being closed, or in different types of packaging for transport. The present invention also relates to the use of said medium to scent commercial premises or warehouses for clothing, fabrics, furniture or goods, as well as to scent containers, vessels or packaging suitable for being closed, the latter being suitable for clothing, fabrics, parts, decorative objects or furniture.

Description

QUALIFICATION

Long-lasting fragrance holder.

STATE OF THE ART

There are many devices for releasing fragrances in cabins over a period of time. In general, these devices work by allowing a fragrance contained in the device to diffuse from the device and into the atmosphere. Fragrance diffusion can be enhanced, for example, by heating the fragrance, including the fragrance in a volatile carrier, by the use of membranes, or by a combination thereof. The diffusion of fragrances and their overall intensity is governed by their equilibrium vapor pressure. Fragrances with a high equilibrium vapor pressure have high volatility and evaporate quickly.

The useful life of a fragrance device is limited by the amount of fragrance that can be dispensed from the device.

For example, one of the difficulties in selecting a carrier that allows uniform fragrance distribution at a selected rate is that some carriers and fragrances evaporate too quickly or conversely too slowly and/or insufficiently to create the desired fragrance. , in a large room.

Controlled release of fragrances may traditionally require pre-packaging of encapsulated fragrances in the final product. Although encapsulation can be functional, sometimes encapsulation can lead to unbalanced fragrance release profiles, due to chemical incompatibility of the fragrance with the encapsulating agents or maldistribution of the fragrance in the encapsulated particles or substances. Also, encapsulation is expensive and therefore increases the cost of the underlying product.

US4515909 is one of the first documents to describe a fragrance article comprising polymeric substrates. Said article comprises an ethylene-vinyl acetate (EVA) copolymer impregnated with a diffusing agent and a fragrance, wherein said copolymer contains between 15% to 30% of the vinyl acetate monomer, by weight, and about 85% to 70% ethylene monomer, by weight. The spreading agent that can be used in said article is selected from the group consisting of benzyl benzoate, benzyl salicylate and mixtures thereof, said spreading agent being absorbed in the EVA copolymer in an amount by weight of approximately 1% up to the 10%.

The patent, US4515909, also describes a method for preparing this fragrance article that first comprises mixing the EVA copolymer and the diffusing agent for a time interval between 1 to 5 hours at a temperature range between 50-76 °C, until that said diffusing agent is completely absorbed by the copolymer. Subsequently, the generated impregnated copolymer can be obtained in the form of a pellet and this is placed in contact with the fragrance at room temperature until the fragrance is absorbed by the previously impregnated copolymer (pellet). The impregnated pellets can also be molded in various shapes, such as EVA sheets with dimensions 1 cm x 1.5 cm x 0.3 cm, to be subsequently impregnated with a specific fragrance until each sheet has absorbed 30%. by weight of said fragrance, for a period of at least two hours.

Subsequently, other publications such as EP 1479757B1 (2004), described a method for imparting to fabrics that are washed in a washing machine for one or more wash cycles and/or to fabrics that are dried in a tumble dryer for one or more drying cycles. , a fragrance with long-lasting unsightly properties. To this end, EP1479757B1 describes a method for imparting said fragrance using a hollow bag/envelope/package inside that comprises multiple solid or viscoelastic particles with a total weight of 2 g to 50 g, each particle having an average effective diameter. from 0.5mm-10mm. Said unblown polymeric particles for fragrances (microporous polymeric particles) consist of a solid/viscous porous particle comprising, by weight, EVA (30%) with a ratio of ethylene:vinyl acetate units of 60:40, PE low density (50%) and a fragrance (20%).

Other solutions for the release of fragrances were described in WO 2008/153680 A, where methods of fragrance release using substrates in the form of strips or tapes are disclosed. Specifically, the use of strips or transparent tapes with a thickness between 1-200 thousandths of an inch (0.025-5 mm), which comprise a substrate that contains at least one copolymer of a define, at least one derivative of a define and a fragrance, wherein said substrate is substantially free of homopolymeric material, said homopolymeric material being, for example, polystyrene, polyethylene, polypropylene or other homopolymers known in the state of the art. Specifically, the copolymer is selected from the group consisting of ethylene-vinyl acetate, propylene-vinyl acetate, and a mixture thereof, and the define derivative is selected from saturated carboxylic acid vinyl esters, saturated carboxylic acid propenyl esters , olefinically unsaturated organic acids and esters, and mixtures thereof.

The method of preparing these substrates in the form of strips or tapes that is carried out by means of the homogeneous mixture of the copolymer, the perfume, a suitable solvent (such as toluene), and optionally an adjuvant. The obtained mixture is then deposited by casting or coating on a silicone release liner, followed by drying at an elevated temperature to remove the solvent. After drying, the strip or tape can be retained in the release liner, or removed from the release liner for use in the applications described herein.

The method of WO 2008/153680 A, has the disadvantage that it requires the use of organic solvents to be able to apply the perfume to the substrate, followed by the application of high temperatures for their evaporation.

Other subsequent patents, such as US 8,119,072B2, were aimed at developing devices to increase the amount of released volatile organic compound (for example, fragrances) in a room or other area. This fragrance dispensing device comprises an electrical resistance, plug or other power source and fragrance in a thermoplastic polymer or carrier. The thermoplastic polymer or carrier also has metal inclusions, such as powdered metal. The thermoplastic carrier is selected from the group consisting of ethylene vinyl acetate (EVA), ethyl vinyl alcohol, high density polyethylene, low density polyethylene, polystyrene, acrylic polymers, polycarbonates, polyurethanes, nylons, blends and copolymers of the foregoing.

The devices according to US 8,119,072B2 have the disadvantage that they need an electrical component or a power supply to release the fragrance in a room in a uniform or controlled manner. Therefore, up to now there have been several attempts to impart fragrance using synthetic resins and although some of them have been particularly successful, they also show disadvantages as mentioned above, such as incompatibilities, lengthy processes or the use of solvent-based processes. organic, undesirable for the environment

In addition, fragrance articles that are easy to hold or handle by hand, that can provide controlled and sustained release over time, as well as sufficient to create the desired fragrance in a large room or enclosed space, in containers or containers, would be desirable. containers adapted to be closed, or in the different types of packaging for transport. Especially, where the use of an electrical resistance, a plug or another power source is not necessary.

SUMMARY OF THE INVENTION

The first aspect of the invention is related to a fragrance support comprising at least:

(i) a polymer matrix containing;

- a copolymer of ethylene and vinyl acetate and

- a polyethylene polymer;

(ii) a fragrance; and

(iii) an excipient, where the excipient is selected from the list consisting of benzyl benzoate and isopropyl myristate; where the fragrance is impregnated in the polymeric matrix and where the excipient is present in the fragrance support in a weight range from 1-35%, preferably between 2-30%.

The presence of the excipient, as well as its concentrations, show good compatibility with the components of the polymeric matrix, while allowing the use of said support with both small and high amounts of fragrance. In addition, it also allows the loading of said support with a wide range of fragrances of different composition and/or nature. The good compatibility of the excipients with the polymeric matrix helps to retain and/or absorb the fragrance in the polymeric matrix, which facilitates a prolonged release of the fragrance over time. Likewise, it facilitates the release of the fragrance both during transport and during its use in open rooms and releases fragrances of a different nature in a sustained manner, such as citrus, floral, wild or marine fragrances.

The support of the first aspect of the invention does not comprise an electrical resistance, a plug or another power source.

In the context of the present invention, the term "fragrance carrier" comprises a compact solid that has no voids or spaces. In a preferred embodiment of the first aspect, the fragrance support does not comprise any envelope or bag having an interior compartment. In another preferred embodiment, the fragrance support is a compact solid that can be spherical, tablet or rectangular in shape. In a more preferred embodiment, the fragrance support is a compact solid in the shape of a sphere, the 3 dimensions that define it will have the same width or diameter (1) with a range between 1.5 and 15 cm or is a compact tablet-shaped or rectangular-shaped solid, where said support can have a width or diameter (1) within a range between 1.5 and 15 cm and/or a height (2) within a range between 0.5 up to 3 cm and/or a depth (3) in a range between 2-15 cm. The width or diameter (1) is measured taking the ends furthest from the center of the tablet as a reference point, as indicated in figures 1-3. Said dimensions facilitate its handling and that it can be used both in large spaces and in small-sized containers or packaging.

In addition, they make it suitable so that it can be held or held in the hand, which makes it easily manageable and suitable for being deposited both in open environments or rooms, such as a room, a store, warehouses; as in environments or rooms closed or adapted to be closed. In addition, the dimensions of the previous embodiment make it possible to obtain a light support that is easy to transport and to incorporate into different types of packaging, such as envelopes, boxes, bags, cardboard tubes, or any package or container that may be included in its inside the support of the first aspect. The packaging, containers or containers, can be selected from the list consisting of cardboard, plastic, crystal, glass or metal. The use of a compact solid also facilitates the impregnation of the support and the sustained release in the long term, optimizing the amount of fragrance that is used in each support, thus avoiding unnecessary losses.

In the context of the present invention, the term polymeric matrix or substrate includes a primary phase that comprises a material composed of at least two polymers in which a secondary phase is embedded that can comprise fragrances, excipients, solid particles, liquids, or gels. The polymeric components of the primary phase must not completely dissolve or fuse with each other, they must be physically identifiable as they form a heterogeneous mixture. The terms polymer matrix or substrate can be used interchangeably.

Fragrance holder has the advantages that it can release a wide range of fragrances over a long period of time in a sustained manner. The support for fragrance of the first aspect can sustainably retain and release fragrances of different natures such as citrus, floral, wild or marine fragrances, while it can comprise a concentration by weight of each of them, to ensure long duration. both during transport and during use in open rooms.

Fragrance support also has the advantage that it can release fragrance in a controlled manner at a rate that is adequate for human sensory satisfaction and/or malodour masking.

The second aspect of the invention is related to a process for obtaining the fragrance support according to the first aspect of the invention, which comprises at least the following stages: a) the ethylene-vinyl acetate copolymer is impregnated with a mixture that it comprises a fragrance and an excipient, at a temperature in a range from 10 to 90 °C; b) the product obtained in the previous stage is mixed with polyethylene until a homogeneous mixture is obtained in a temperature range from 40 to 80 °C; c) the mixture obtained in the previous stage is injected inside an injection mould; d) is removed from the fragrance support of the finished mould, after completion of step c) of the injection mould.

The process of the second aspect allows the ethylene-vinyl acetate (EVA) copolymer to be impregnated with the fragrance and the excipient in a single stage, reducing process times while allowing the correct impregnation and absorption of both in the EVA and the matrix of the support so that the fragrances are retained and are subsequently released in a sustained manner over time for a long period of time. Preferably for at least 1 month, more preferably for at least 2 months, most preferably for at least 3 months.

The third aspect of the invention is related to the support obtainable through the process of the second aspect.

The fourth aspect of the invention is related to the use of the support for fragrance of the first aspect and of the fragrance obtainable through the process of the second aspect, in the aromatization of commercial premises, clothing, textile, furniture or merchandise stores, as well as to flavor containers, containers or packaging adapted to be closed suitable for clothing, textiles, pieces, decorative objects or furniture.

FIGURES

Figure 1: 3-dimensional representation of a particular embodiment of the support for fragrances with a spherical shape.

Figure 2: Representation in 3 dimensions of a particular embodiment of the tablet-shaped support for fragrances.

Figure 3: Representation in 3 dimensions of a particular embodiment of the support for fragrances with a rectangular shape.

DETAILED INVENTION

The first aspect of the invention is related to a fragrance support comprising at least: (i) a polymer matrix containing;

- a copolymer of ethylene and vinyl acetate and

- a polyethylene polymer;

(ii) a fragrance; and

(iii) an excipient, where the excipient is selected from the list consisting of benzyl benzoate and isopropyl myristate; where the fragrance is impregnated in the polymer matrix and where the excipient is present in the fragrance support in a weight range from 1-35%, preferably between 2-30%

In a preferred embodiment of the first aspect of the invention, the polymeric matrix does not contain metals in the form of aluminum powder.

In a preferred embodiment of the first aspect of the invention, the fragrance is impregnated and/or retained in the polymeric matrix, preferably the fragrance is impregnated and/or retained in the EVA comprised in the polymeric matrix.

In another preferred embodiment of the first aspect of the invention, the excipient is selected from the list consisting of benzyl benzoate, isopropyl myristate and mixtures thereof, where the mixtures thereof comprise benzyl benzoate and isopropyl myristate in a Weight ratio from 80/20 to 20/80.

In another preferred embodiment of the first aspect of the invention, fragrance and the excipient are retained in the polymeric matrix.

In a preferred embodiment of the first aspect of the invention, the fragrance carrier further comprises one or more additives. Preferably the additives can be selected from plasticizers, diluents and/or colorants. In a preferred embodiment, the additive is a dye selected from the list consisting of, Yellow Oxide (Cl 77492), Red Oxide (Cl 77491), Green Oxide (Cl 77288), Ultramarine Blue (Cl 77007), Ultramarine Pink (Cl 77007), Ultramarine Violet (Cl 77007), Titanium Dioxide (Cl 77891), Zinc Oxide (Cl 77949), Black Oxide (Cl 77499), Charcoal (Cl 77268), Tartrazine Yellow (Cl 19140), Egg Yellow ( Cl. 19140, Cl. 16255), Sunset Yellow, Orange (Cl. 15985), Ponceau Red (Cl. 16255), Fuchsia Pink (Cl. 45100) and D&C Violet (Cl 60725). Plasticizers can also be added to polymeric materials that are used in embodiments of the invention. Plasticizers can be selected from a list consisting of; Bis(n-butyl)phthalate, polyethylene glycol with molecular weight (Mn) ranging from 200-6000, Triethylcitrate (TEC), Acetyltriethylcitrate (ATEC), Tributylcitrate (TBC), Acetyltributylcitrate (ATBC), Trioctylcitrate (TOC), Acetyltrioctylcitrate ( ATOC),

Trihexylcitrate (THC), Acetyltrihexylcitrate (ATHC), Butyryltrihexylcitrate (BTHC, trihexyl o-butyrylcitrate), Trimethylcitrate (TMC), and tricetic acid ester of glycerin and citric acid.

In another preferred embodiment of the first aspect of the invention, the polymeric matrix is present in the fragrance carrier in a percentage by weight from 45-92%, more preferably in a percentage by weight from 50-90%.

In the context of the present invention, the term polyethylene polymer includes polyethylene homopolymers and polyethylene copolymers having a density from 945-980 kg/m ³ , preferably from 950-975 kg/m ³ and/or a point of melting point measured by DSC between 120-150 °C, preferably melting point measured by DSC (differential scanning calorimetry) is between 125-140 °C. The DSC measurement was carried out with a heating rate of 10 degrees per minute. The polyethylene copolymers can be copolymers of polyethylene and polypropylene. Preferably, the polyethylene polymer used in the invention can have a hardness, measured with a durometer according to the ISO 868 method on the D scale, in a range between 75-90, preferably between 63-72.

In a preferred embodiment, the polyethylene polymer is a polyethylene homopolymer. In another more preferred embodiment the polyethylene polymer consists of a polyethylene homopolymer. In another even more preferred embodiment, the polyethylene polymer is a high density polyethylene homopolymer.

In another preferred embodiment of the first aspect of the invention, polyethylene is present in the fragrance carrier in a percentage by weight from 3-25%, more preferably in a percentage by weight from 5-20%. Surprisingly, the fragrance carrier of the first aspect has good fragrance retention and release despite its high polyethylene content.

Ethylene vinyl acetate copolymers, also commonly known as EVA, is an elastomer that is naturally odorless, and can be processed as thermoplastics. In the context of the present invention, the term ethylene vinyl acetate copolymer and (EVA) comprises between 20-40% by weight of vinyl acetate and/or between 80-60% by weight of ethylene. Preferably, the EVA used in the invention can have a hardness measured with a durometer according to the ASTM D 2240 method, on the A scale, in a range between 75-90, preferably between 78-85. The inventors of the present invention have identified that the supports that comprise a copolymer of ethylene and vinyl acetate (EVA) comprise vinyl acetate in a range between 20-40% by weight and/or ethylene in a range between 80-60% by weight. of provide better fragrance release over a long period of time without the need to use an electrical resistance, a plug or another power source. The supports that comprise a copolymer of ethylene and vinyl acetate with a range of vinyl acetate outside of those described, that is, lower or higher than the range between 20-40% by weight, provide worse releases of the fragrances of the invention.

In a preferred embodiment, the EVA copolymer has a melting point, measured by DSC, in a range between 55-85 °C, preferably between 60-80 °C. Melting point measurement by DSC was carried out at a temperature rise rate of 10 C/min.

In another preferred embodiment, the EVA copolymer has a density measured by the ASTM D 1505 method, in a range between 0.92-0.98 g/cm ³ .

In another preferred embodiment of the first aspect of the invention, the EVA is present on the fragrance carrier in a percentage by weight from 25-80%, more preferably in a percentage by weight from 30-75%.

The term fragrance comprises, fragrances or fragrance compositions, fragrances based on water or natural oils, which may be volatile and may be transmitted to the olfactory system.

In the context of the present invention, the terms "fragrance" and "perfume" will be used interchangeably. The singular terms fragrance and perfume can mean one or more different fragrance molecules as mixtures or blends of fragrance molecules.

The term fragrance can include one or more aromatic properties, such as fragrance materials such as top fragrance, mid fragrance, or base fragrance; these fragrances or their compositions are often used, such as including but not limited to essential oils, aromatic essential oils, various scents, fragrance family floral, citrus fragrance family, marine fragrance family and/or wild and floral fragrance family. Other suitable fragrances include, but are not limited to Smoky, Aldehyde, Aliaceous, Musky, Woody, Animal, Anise, Powdery, Balsamic/Menthol, Cocoa, Coffee, Coniferous, Leather, Sweet, Spicy, Fruity, Gourmande, Mushroom/Earthy, Dairy, Marine/Ozonic, Oriental, Earthy, Toasty, Green, Vinous The fragrance is preferably in liquid or oil form.

The floral family of fragrances is one of the most popular and extensive of all perfume families. This family includes all the perfumes whose main theme is the olfactory representation of a single flower (soliflore) or a set of vandalized flowers (bouquet). Enriching them with accessory notes, they give rise to subgroups such as green floral, aquatic, fruity, white flower, floral-aldehyde, spicy and floriental fragrances. The most classic and iconic floral notes are three: rose, jasmine and neroli.

The family of citrus fragrances, also known as Hespéride, is characterized by being eminently composed of top notes from citrus fruit peels such as bergamot, lemon, orange, tangerine or grapefruit. They are usually soft and fresh fragrances, with an acid touch. Probably the most iconic fragrances that can be included in this family are the traditional cologne waters, made up of fresh and volatile notes, the common notes in this type of perfume are; lemon, orange, lime, grapefruit, bergamot, tangerine, yuzu, petitgrain, neroli, orange blossom.

In a preferred embodiment of the first aspect of the invention, the fragrance is present in the fragrance carrier in a range between 3-25% by weight.

The second aspect of the invention is related to a process for obtaining the fragrance support according to the first aspect of the invention, which comprises at least the following stages: a) the ethylene-vinyl acetate copolymer is impregnated with a mixture that it comprises a fragrance and an excipient, at a temperature in a range from 10 to 90 °C; preferably in a range from 20-80 °C; b) the mixture obtained in the previous stage is maintained in a temperature range between 10 to 90 °C; preferably in a range from 20-80 °C, for a period of time between 2-7 hours; c) the product obtained in the previous stage is mixed with polyethylene until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; d) the mixture obtained in the previous stage is injected inside an injection mold at a temperature in a range between 110-140 °C; and e) is removed from the finished mold fragrance support, after completion of step c) of the injection mold.

The ethylene vinyl acetate (EVA) copolymer of step a) of the second aspect of the invention corresponds to and is the same as the EVA copolymer of the first aspect of the invention. Similarly, the polyethylene of step b) of the second aspect of the invention corresponds to and is the same as the polyethylene of the first aspect of the invention.

In another preferred embodiment of the second aspect of the invention, the excipient and fragrance are mixed in an excipient/fragrance weight ratio in a range from 2.5-0.1, preferably in a range from 2-0.3, plus preferably in a range from 2-0.5.

In another preferred embodiment of the second aspect of the invention, the impregnation step b) is carried out by spraying, pulverizing or spraying techniques.

In another preferred embodiment of the second aspect of the invention, the mixing process of stage b) is carried out in a time range from 15 to 180 min, depending on the fragrance and the composition to be prepared. Preferably, between 15 min and 120 min.

In another preferred embodiment of the second aspect of the invention, the ethylene vinyl acetate copolymer and the polyethylene polymer used are preferably in the form of a squawk.

In another preferred embodiment of the second aspect of the invention, the mold has the dimensions of the fragrance holder.

In another preferred embodiment of the process of the second aspect for obtaining the fragrance support, said process comprises at least the following stages: a) the ethylene-vinyl acetate copolymer is impregnated with a mixture comprising a fragrance and an excipient, a a temperature in a range from 10 to 90 °C; preferably in a range from 20-80 °C, where the excipient is selected from the list consisting of benzyl benzoate and isopropyl myristate; and where optionally weight ratio of ethylene vinyl acetate copolymer to excipient is from 20:1 to 1:1; b) the product obtained in the previous stage is mixed with a polyethylene polymer until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; c) the product obtained in the previous stage is mixed with polyethylene until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; d) the mixture obtained in the previous stage is injected inside an injection mold at a temperature in a range between 110-140 °C; and e) is removed from the finished mold fragrance support, after completion of step c) of the injection mold.

In another preferred embodiment of the process of the second aspect for obtaining the fragrance support, said process comprises at least the following stages: a) the ethylene-vinyl acetate copolymer is impregnated with a mixture comprising a fragrance and an excipient, a a temperature in a range from 10 to 90 °C; preferably in a range from 20-80 °C, where the excipient is selected from the list consisting of benzyl benzoate and isopropyl myristate; where the weight ratio of ethylene vinyl acetate copolymer to excipient is from 20:1 to 1:1 and where the mixture of fragrance and excipient comprises a weight concentration of the excipient in the mixture from 35% to 65% ; b) the product obtained in the previous stage is mixed with a polyethylene polymer until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; c) the product obtained in the previous stage is mixed with polyethylene until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; d) the mixture obtained in the previous stage is injected inside an injection mold at a temperature in a range between 110-140 °C; and e) is removed from the finished mold fragrance support, after completion of step c) of the injection mold.

In another preferred embodiment of the process of the second aspect for obtaining the fragrance support, said process comprises at least the following stages: a) the ethylene-vinyl acetate copolymer is impregnated with a mixture comprising a fragrance and an excipient, a a temperature in a range from 10 to 90 °C; preferably in a range from 20-80 °C; where the excipient is selected from the list consisting of benzyl benzoate and isopropyl myristate; where the weight ratio of the ethylene vinyl acetate copolymer to the mixture, fragrance and excipient, is from 8:1 to 0:4; and optionally where the mixture of fragrance and excipient comprises a weight concentration of the excipient in the mixture from 35% to 65%, b) the product obtained in the previous stage is mixed with a polyethylene polymer until a homogeneous mixture in a temperature range from 10 to 90 °C; preferably from 20-80 °C; c) the product obtained in the previous stage is mixed with polyethylene until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; d) the mixture obtained in the previous stage is injected inside an injection mold at a temperature in a range between 110-140 °C; and e) is removed from the finished mold fragrance carrier, after completion of step c) of the injection mold.

In a preferred embodiment of the process of the second aspect, the weight ratio of the ethylene and vinyl acetate copolymer to the mixture, fragrance and excipient, is from 8:1 to 0:4 and/or the fragrance and excipient mixture comprises a weight concentration of the excipient in the mixture from 35% to 65%.

In a preferred embodiment of the process of the second aspect, the fragrance is mixed with the excipient in the appropriate proportions as described in the first aspect of the invention. Once said mixture is obtained, the EVA copolymer is impregnated with the newly obtained mixture of fragrance and excipient, for a time range from 15 min to 90 min in a mixer at a temperature in a range between 10-90 °C, preferably between 15-75°C. Next, the polyethylene polymer is added to the same mixer, where they are mixed for a period of time between 15-60 min at a temperature in a range between 10-60 °C, preferably between 15-40 °C. The mixture obtained is injected into an injection mold that works at an injection temperature range between 110-140 °C. The fragrance support obtained has the advantage that it retains both the fragrance and the excipient once the last stages d) and e) have been completed, providing a fragrance support that allows the prolonged release of the fragrance over time for at least 1 month, more preferably for 2 months, without the need to heat the support or connect said support to any electrical device.

The process of the second aspect allows the ethylene-vinyl acetate (EVA) copolymer to be impregnated with the fragrance and the excipient in a single stage, reducing process times while allowing the correct impregnation and absorption of both in the EVA and the matrix of the support so that they are retained and are released in a sustained manner over time for a long period of time. Preferably for at least 1 month, more preferably for at least 2 months, most preferably for at least 3 months. The correct impregnation and absorption, as well as its sustained release, are carried out even after the injection and extraction stages of the mold c) and d) respectively. Carrying out stage a) in which the impregnation of the EVA copolymer with the excipient and the fragrance is carried out in a single stage also facilitates the retention of the fragrance in the polymeric matrix during and after the injection process, obtaining shorter processes, reducing fragrance loss during injection, obtaining better retention and absorption of the fragrance and better release of the fragrance in the final fragrance support once the process is completed.

In addition, the process of the second aspect allows the preparation of these supports with polyethylene polymers, which showed incompatibility, as indicated in the state of the art, in the preparation of articles, supports or substrates for fragrances.

The third aspect of the invention is related to the support obtainable through the process of the second aspect. The fourth aspect of the invention is related to the use of the support for fragrance of the first aspect in the aromatization of commercial premises, clothing stores, textiles, furniture or merchandise, as well as to aromatize containers, containers or packaging adapted to be closed suitable for clothing, textiles, pieces, decorative objects or furniture.

The support of the first aspect, as well as the support obtained from the process of the second aspect, has the advantage that it does not leave residues on clothing, textiles, packaging or materials that are in its vicinity, therefore it does not cause deterioration to said items. materials or packaging.

The fourth aspect of the invention is related to the use of the support for fragrance of the first aspect or the support for fragrance obtained from the second aspect in the aromatization of commercial premises, clothing, textiles, furniture or merchandise stores, as well as to aromatize containers, containers or packaging adapted to be closed, being these suitable for clothing, textiles, pieces, decorative objects or furniture.

examples

Example 1: support composition for fragrance comprising fragrance from the wild family.

¹ % by weight refers to the total fragrance support.

The wild fragrance is mixed with the excipient. Once said mixture is obtained, the EVA copolymer is impregnated with the newly obtained mixture of fragrance and excipient, for 25 min in a mixer at a temperature in a range between 21-48 °C. The mixture is then kept at that temperature for 4 hours. Next, the polyethylene polymer is added to the same mixer and this is mixed for 30 min at a temperature in a range between 21-48 °C. The mixture obtained is injected into an injection mold that works at a temperature range between 110-140 °C.

The EVA used has a ratio of % VA (vinyl acetate) between 25-30%.

Example 2: Support composition for fragrance comprising fragrance from the marine family.

The Marina fragrance is mixed with the excipient. Once said mixture is obtained, the EVA copolymer is impregnated with the newly obtained mixture of fragrance and excipient, for 25 min in a mixer at a temperature in a range between 21-55 °C, the mixture is maintained at that temperature for 4 hours. . Next, the polyethylene polymer is added to the same mixer and this is mixed for 30 min at a temperature in a range between 21-55 °C. The mixture obtained is injected into an injection mold that works at a temperature range between 110-140 °C. The EVA used has a ratio of % VA (vinyl acetate) between 25-30%.

Example 3: Support composition for fragrance comprising fragrance from the citrus family.

¹ % by weight refers to the total fragrance support.

The citrus fragrance is mixed with the excipient. Once said mixture is obtained, the EVA copolymer is impregnated with the newly obtained mixture of fragrance and excipient, for 25 min in a mixer at a temperature in a range between 21-35 °C and a stirring speed in a range from 200- 1000 rpm. The mixture is then kept at that temperature for 5 hours. Next, the polyethylene polymer is added to the same mixer and this is mixed for 30 min at a temperature in a range between 21-35 °C. The mixture obtained is injected into an injection mold that works at a temperature range between 110-140 °C. The EVA used has a ratio of % VA (vinyl acetate) between 25-30%.

Example 4: support composition for fragrance comprising fragrance of the floral family.

¹ % by weight refers to the total fragrance support.

The floral fragrance is mixed with the excipient. Once said mixture is obtained, the EVA copolymer is impregnated with the newly obtained mixture of fragrance and excipient, for 25 min in a mixer at a temperature in a range between 21-70 °C. the mixture is then maintained at that temperature for 3.5 hours. Next, the Polyethylene polymer is added to the same mixer and this mixture is mixed for 30 min at a temperature in a range between 21-70 °C. The mixture obtained is injected into an injection mold that works at a temperature range between 110-140 °C. The EVA used has a ratio of % VA (vinyl acetate) between 25-30%.

Claims

1. Fragrance support comprising at least: i) a polymeric matrix containing;

- a copolymer of ethylene and vinyl acetate and

- a polyethylene polymer;

ii) a fragrance; and iii) an excipient, where the excipient is selected from the list consisting of benzyl benzoate and isopropyl myristate; where the fragrance is impregnated in the polymeric matrix and where the excipient is present in the fragrance carrier in a weight range from 1-35%.

2. Support according to the preceding claim, wherein said support does not include an electrical resistance, a plug or any other power source.

Support according to any of the preceding claims, wherein the polyethylene polymer is a polyethylene homopolymer, preferably the polyethylene polymer consists of a polyethylene homopolymer.

4. Support according to any of the preceding claims, wherein the polyethylene polymer is a high-density polyethylene homopolymer and/or has a density from 945-980 kg/m ³ .

5. Support according to any of the preceding claims, wherein the polyethylene polymer is present in the fragrance support in a weight range, w/w%, from 3-25%, more preferably in a weight range from 5-20 %.

6. Support according to any of the preceding claims, where the fragrance support is a compact three-dimensional solid in the shape of a sphere, tablet or rectangular shape, and/or when the fragrance support is a compact three-dimensional solid in the form of a sphere. diameter (1) is within a range between 1.5 and 15 cm and or when the support is a compact three-dimensional solid with the shape of a tablet or rectangular shape, the dimensions of said support have a diameter (1) in a range from 1.5-20 cm, a height (2) from 0.5 to 3 cm and a depth (3) from 2-15 cm.

7. Support according to any of the preceding claims, wherein the ethylene and vinyl acetate copolymer comprises vinyl acetate in a w/w% weight range, between 20 to 40%. Support according to any of the preceding claims where the polymeric matrix consists of a copolymer of ethylene and vinyl acetate and a polyethylene polymer. Support according to any of the preceding claims where the polymeric matrix is present in a range by weight, w/w% in relation to the fragrance support from 45-92%. Support according to any of the preceding claims, wherein the ethylene vinyl acetate copolymer is present in the fragrance support in a weight range, w/w%, from 25-80%, more preferably in a weight percentage from 30- 75% Support according to any of the preceding claims, where the fragrance is impregnated in the ethylene-vinyl acetate copolymer contained in the polymer matrix. Support according to any of the preceding claims, where the fragrance is selected from the list consisting of Wild, Smoked, Aldehyde, Aliaceous, Musky, Woody, Animal, Aniseed, Powdery, Balsamic/menthol, Cocoa, Coffee, Citrus, Coniferous, Leather , Sweet, Spicy, Floral, Fruity, Gourmande, Mushroom/Earthy, Dairy, Marine/Ozonic, Oriental, Earthy, Toasted, Green, Vinous Support according to any of the preceding claims, where the fragrance is present in the support for fragrances in a range by weight between 3-25%. Support according to any of the preceding claims, wherein the excipient is present in the fragrance support in a weight range from 2-30%. Support according to any of the preceding claims, wherein said polymeric matrix does not comprise metallic inclusions, selected from the group consisting of aluminum, nickel, gold, silver, copper, platinum and mixtures thereof. Support according to any of the preceding claims, where the fragrance is impregnated in the polymeric matrix. Process for obtaining the support for fragrance according to claims 1-16 comprising at least the following stages: a) the ethylene and vinyl acetate copolymer is impregnated with a mixture comprising a fragrance and an excipient, at a temperature in a range from 10 to 90 °C; preferably from 20-80 °C; b) the product obtained in the previous stage is mixed with a polyethylene polymer until a homogeneous mixture is obtained in a temperature range from 20 to 90 °C; preferably from 20-80 °C; c) the product obtained in the previous stage is mixed with polyethylene until a homogeneous mixture is obtained in a temperature range from 10 to 90 °C; preferably in a range from 20-80 °C; d) the mixture obtained in the previous stage is injected inside an injection mould; e) is removed from the fragrance support of the finished mould, after completion of step c) of the injection mould.

18. Process for obtaining the fragrance support according to claim 17, wherein the ethylene-vinyl acetate copolymer is impregnated with the mixture obtained in step a) for at least 20 min and/or the mixing process of the stage b) is carried out in a time range from 15 to 180 min.

19. Process for obtaining the fragrance support according to any of claims 17-18, wherein the mold has the dimensions of the fragrance support.

20. Process for obtaining the fragrance support according to any of claims 17-19, wherein the impregnation step b) is carried out by means of spraying, pulverizing or spraying techniques.

21. Process for obtaining the support for fragrance according to any of claims 17-20, where the injection temperature is in a range from 100 to 140 °C;

22. Process for obtaining the support for fragrance according to any of claims 16-21, wherein the excipient and fragrance are mixed in step a) in a weight ratio of excipient to fragrance from 2.5 to 0.1, preferably in a range from 2 to 0.3.

23. Process for obtaining the support for fragrance according to any of claims 16-22, wherein the weight ratio of ethylene and vinyl acetate copolymer to excipient is from 20:1 to 1:1.

24. Support for fragrances obtainable through the process according to any of claims 17-23.

25. Use of the support for fragrance according to any of claims 1-16 or of the support for fragrance obtained from the process according to claims 17-23, or the fragrance carrier obtainable according to claim 24, for scenting clothing, textiles, a room, clothing parcels for mailing, shops, clothing stores, furniture or merchandise, as well as for aromatize containers, containers or packaging adapted to be closed, these being suitable for clothing, textiles, pieces, decorative objects or furniture.