EP2191979A2 - Scented tattoo plaster - Google Patents

Abstract

Multilayered patch contains an adhesive layer (1), a printed supporting layer (2), a lacquer layer (3) containing perfume, and a removable protective layer (4). The perfume is contained in microcapsules. The printed supporting layer has an inner surface and an outer surface, where the inner surface is aligned to the adhesive layer, while the outer surface is aligned to the lacquer layer. An independent claim is also included for a method for producing a product, preferably tattoo plaster, which involves applying fragrance containing coating layer on printed supporting layer using printing process.

Description

The subject of the present invention is a multi-layer, fragrant tattoo patches with directed, long-lasting fragrance delivery, for application to the skin.

The invention further relates to the manufacture of this tattoo plaster and its use.

US 5,817,385 discloses a removable, fragrant tattoo that combines visual and olfactory properties. The removable fragrant tattoo includes a substrate layer (16) having a printed image (18) on one surface and an adhesive (20) on the opposite surface. A scented layer (14) is applied to the tattoo. The tattoo is then applied to a body part to release the fragrance during transfer of the tattoo to the body.

In this case, a preferred embodiment of this product consists of a support layer (12) made of paper, plastic or the like, which is coated with a removable tattoo layer (10), which in turn is coated with a layer (14) containing fragrant microcapsules. The tattooing layer (10) is a substrate (16) having a printed image (18) on one surface and a pressure sensitive adhesive (20) on the other surface of the substrate (16). The substrate (16) is preferably a film or sheet material formed from any polymeric film, preferably a flexible, porous, non-woven, densified fabric or compacted fibrous material. The printed image (18) is formed by dyes and can be single or multi-colored. The adhesive (20) is preferably pressure-sensitive and moisture-permeable, for which, for example, acrylic and polyurethane pressure-sensitive adhesives are suitable. The fragrance-containing layer (14) contains capsules in the order of 5 to 150 microns. The capsules can be prepared by standard methods.

In the application, the tattoo (10) by inverting the backing layer (12) applied to the skin, wherein the fragrance-containing layer (14) and the tattoo layer (10) come into direct contact with the skin surface. Pressure is then applied to the outer surface (12a) of the backing layer (12) such that the microcapsules in the fragrance-containing layer (14) rupture and the adhesive layer (20) attaches the substrate (16) and print image (18) to the skin surface ,

In this way, by the friction in the transfer of the tattoo to the skin, the microcapsules of the fragrance-containing layer (14) broken and released the fragrance. The fragrance may then be perceived with the olfactory senses for a period of time while the printed image provides the consumer with a ready visual indication of the name or scent mark.

The disadvantage of in US 5,817,385 described products is that the fragrance release by the mechanical stress (friction, etc.) takes place at the moment of applying the tattoo. Fragrance release is dependent on the number of microcapsules destroyed during application. But this also means that the period over which the scent can be perceived depends on this.

The object of the present invention is to provide a fragrant tattoo with a long release of fragrance. In particular, the release of fragrance should take place in the environment and be controlled by the user. Preferably, the release of fragrance should take place as required, which should be possible by activating a renewed release of fragrance after application of the tattoo several times.

Also, the fragrant tattoo should be produced with a long release of fragrance in a simple and cost-effective manner.

The object is achieved by a multilayer patch for application to the skin, which a) has an adhesive layer (1), b) a printed carrier layer (2) and c) at least one fragrance-containing lacquer layer (3).

In a particular embodiment, the multi-layer patch for application to the skin may also include a peelable protective layer (4) covering the adhesive layer.

In a further particular embodiment, the fragrance of the lacquer layer containing a fragrance may also be contained in microcapsules. In this form, the usefulness of the multi-layer plaster depends essentially on the life of the microencapsulated fragrance.

In a further embodiment, the multi-layer plaster can be punched into an individual shape.

The object is further achieved by a method for producing a multilayer patch for application to the skin, which comprises a) an adhesive layer, b) a printed carrier layer and c) a lacquer layer containing at least one fragrance, this lacquer layer being applied to the Carrier layer is applied. As a pressure medium (= quasi the "printing ink") serves a flowable mixture of the at least one perfume and the paint.

The multi-layer plaster is produced in several steps, with a central step being the laminating of a first laminate and of a second laminate, wherein a permanent full-surface joining of the two previously produced laminates takes place.

The first laminate is a composite of adhesive layer (1) and peelable protective layer (4), wherein the adhesive layer may be provided with a cover layer for storage purposes. The second laminate contains the printed carrier layer (2) and the lacquer layer (3) containing the at least one perfume. The laminating of the two laminates takes place in such a way that first of all the covering layer is removed from the first laminate. The adhesive layer of the first laminate is then brought into contact with the printed backing layer (2) of the second laminate.

In the resulting composite material now predetermined contours can be punched, supernatant punching residue deducted and the resulting individual, multi-layer plaster are packed.

In a preferred embodiment of this method, the fragrance is contained in microcapsules.

The use of a multi-layer patch for application to the skin, which comprises a) an adhesive layer, b) a printed backing layer and c) a lacquer layer containing at least one fragrance for a long release of fragrance, is finally another solution according to the invention.

The adhesive layer (1) is the component of the multi-layer plaster, which causes the adhesion of the patch on the skin. The adhesive layer is therefore preferably pressure-sensitive. Preferably, it is a skin-compatible adhesive layer.
By "skin-friendly" is meant that the material causes no skin irritation or allergies.

The adhesive layer has a thickness of 40 to 100 microns, preferably from 60 to 70 microns. This layer thickness ensures that the multi-layer plaster, if necessary, safely adheres to the skin over a longer period of time.

Suitable materials for the adhesive layer are polymer materials, in particular poly (meth) acrylates, polyisobutylenes, polyterpenes (= polyisoprenes), ethylene-vinyl acetate copolymers, synthetic rubbers, styrene-isoprene-styrene block copolymers, styrene-butadiene-styrene block copolymers, Hot-melt adhesive (here: in particular ethylene-vinyl acetate copolymers, vinylpyrrolidone-vinyl acetate copolymers, resins such as rosin and its derivatives, waxes such as natural beeswax or synthetic waxes), blends of rubbers and resins, silicone pressure-sensitive adhesive, polyvinyl acetate, polyvinylpyrrolidones , Polyvinyl alcohols, polyethylene glycols, polyethylene oxides, cellulose derivatives (such as hydroxypropyl methylcellulose) and mixtures of these polymers.

Some of these polymeric materials are inherently pressure-sensitive, some only by addition of suitable excipients (e.g., tackifiers) pressure-sensitive adhesive formulations. Such pressure-sensitive adhesive formulations based on the polymer materials mentioned are generally known to the person skilled in the art and are commercially available. The polymer materials are available in this form as a pure substance, as a water-based dispersion or in solution of an organic solvent.

Particularly preferred as the material for the adhesive layer are poly (meth) acrylates and ethylene-vinyl acetate copolymers.

The adhesive layer may further comprise one or more known auxiliaries, especially those from the groups of plasticizers, emulsifiers, tackifiers, solubilizers, stabilizers, fillers and carriers.

The adhesive layer preferably has a polymer content of 10 to 100 wt .-%, in particular 70 to 100 wt .-%; the proportion of auxiliaries is preferably between 0.1 and 30 wt .-%, in particular between 0.1 and 10 wt .-%.

The adhesive layer ensures that the multi-layer plaster adheres to the skin for at least 6 hours. However, under certain circumstances it is also possible for the multi-layer plaster to have several, i.e., more than one, adhesive properties due to the adhesive properties of the adhesive layer. at least two days on the skin sticks.

The adhesive layer (1) is produced depending on the polymer material used. For this purpose, the removable protective layer (4) is coated with a solution or dispersion of the polymer material and any excipients contained therein and the solvent removed by heating in the drying channel. The result is a laminate of peelable protective layer (4) and adhesive layer (1). Another possibility is to melt the polymeric material and any excipients contained therein by heating and to coat the resulting flowable mixture on the peelable protective layer. Upon cooling, a solidification of the melt, wherein a laminate of peelable protective layer (4) and adhesive layer (1) is formed. The laminates produced in this way can be provided with a cover layer for better storage.

Under a printed carrier layer (2) is understood to mean a component which has a particular strength and gives the multilayer plaster dimensional stability. It can therefore also be regarded as a supporting layer. The printed carrier layer can be constructed of a "skin compatible" plastic material. The printed carrier layer is preferably a film.

"Printed" as an adjective in relation to the carrier layer in the sense of this description means that the carrier layer has a monochrome or multicolored image which represents the visually perceptible image of the tattoo. This image can be concrete or abstract, contain a logo or be a logo.

Suitable materials for the printed carrier layer are films made of polyester (PE) in question, such as. As polyethylene terephthalate (PET) and polybutylene terephthalate (PBT), but also those of polyvinyl chloride (PVC), ethylene-vinyl acetate copolymers (EVA), polyvinyl acetate (PVA), polylactic acid (PLA), polyethylene (PE), polypropylene (PP, here especially oriented polypropylene OPP and biaxially oriented polypropylene BOPP), polyurethane (PU), cellulose derivatives and others. Preferred are films of polyester (PE, PET and PBT) and polypropylene (PP, OPP and BOPP).

Preferred are films of materials which have a barrier effect with respect to perfume and fragrances.

The printed carrier layer has a thickness of 9 to 60 microns, preferably from 12 to 25 microns.

In a preferred embodiment, the printed carrier layer has a metal layer, which is preferably applied by vapor deposition. As the metal comes in particular aluminum in question. This metal layer is preferably located only on one surface of the film. This is the one Surface of the carrier layer (2), which faces in the multi-layer plaster of the adhesive layer (1).

By definition, this surface of the carrier layer provided with a metal layer is referred to as "inside" (2i) in this specification, while the opposite surface of the carrier layer is consequently referred to as "outside" (2a).

The outside of the carrier layer (2a) has the one or more color image. Preferably, this outer side (2a) is subjected to a corona treatment. It is a surface treatment that can increase the polarity of the surface and thus improve wettability and chemical affinity. The corona treatment can be carried out continuously at the end of the production process during film production. Preferably, however, the corona treatment is carried out immediately before the printing of the outside (2a) with the image.

A particularly suitable carrier layer (2) is a film of polyethylene terephthalate (PETP) with a layer thickness of less than 25 .mu.m, which is vapor-deposited on the inside (2i) with aluminum and prepared on the outside (2a) by corona treatment. Immediately before printing on the outside (2a), a "refreshment" can take place by a further corona treatment.

Another particularly suitable carrier layer (2) is a film of oriented polypropylene (OPP) with a layer thickness of greater than 15 .mu.m, which is vapor-deposited on the inside (2i) with aluminum and prepared on the outside (2a) by corona treatment. This film must be corona treated immediately before printing on the outside (2a).

The lacquer layer (3) containing a fragrance is the element of the multi-layer plaster which, after its application, is intended to ensure the release of fragrance into the environment. The lacquer layer is located on the side of the printed carrier layer, which faces away from the adhesive layer. Preferably, the lacquer layer containing the fragrance is directly on the printed carrier layer.

The lacquer layer is composed of a lacquer and contains at least one fragrance. The proportion of perfume in this layer may be between 0.1 and 60% by weight, preferably between 1 and 20% by weight. The proportion of the perfume is determined essentially by the purpose of the multi-layer plaster.

For the purposes of the present description, a paint is understood as meaning a liquid, pasty or pulverulent coating material which, when applied to a substrate, gives a covering coating. Preferably, a non-pigmented coating material is used for the production of the lacquer layer (3), which is also designated by the term clear lacquer.

Suitable materials for the paint are printing varnishes in question, in particular water-based printing varnishes. These lacquers are based on acrylate resin emulsions which are formed by evaporation of water and precipitation of the resins in a short time, i. H. dry within seconds. Higher gloss values can be achieved by using UV-curing paints. Here, the acrylate resin emulsion photoinitiators are added, which cause crosslinking of the acrylate oligomers by UV irradiation. The drying takes place here even faster, d. H. within fractions of a second. Preference is given to a water-based printing varnish from Ruco, Rupf & Co., Glattbrugg (Switzerland), designated WD011422.

The lacquer layer (3) containing the at least one fragrance is prepared by incorporating the at least one fragrance into the lacquer and then printing a substrate with the resulting mixture. The perfume can also be used in the form of perfume-containing microcapsules. The substrate used is preferably the printed carrier layer (2), in particular outer side (2a) of the carrier layer.

In the multi-layer plaster, the varnish layer (3) containing the at least one fragrance has a thickness as thin as possible and as thick as necessary. In this way it can be achieved that - the thinner the lacquer layer (3) is - the more flexible the multi-layer plaster can be. The thickness of the lacquer layer (3) can therefore be between 5 and 20 μm, preferably between 6 and 12 μm.

The layer thickness of the lacquer layer (3) can be varied by adjusting the coating height.

The peelable protective layer (4) may be included in the product to cover the adhesive layer and thus prevent unwanted sticking. Before applying the multi-layer plaster, the peelable protective layer is peeled off the adhesive layer and the remaining product is applied to the skin with the adhesive layer.

The peelable protective layer is in the form of a film. It may have a thickness of up to 150 μm or more. Preferably, the thickness of the protective layer (4) is in the range of 75 to 100 μm. In general, as the peelable protective layer (4), a film with a greater thickness is selected because this improves the processability of the other layers of the multi-layer plaster. Since the protective layer (4) is removed from the skin before application of the multi-layer plaster and discarded, this component of the multi-layer plaster is also not critical for the application of the remaining layers as a fragrant tattoo plaster.

For the peelable protective layer (4), the same materials can be used as for the carrier layer (2). Unlike the carrier layer, the protective layer is subjected to a different surface treatment, e.g. a siliconization or a fluorosiliconization. As a result, the corresponding surface of the protective layer (4) is equipped anti-adhesive. As peelable protective layers but also polytetrafluoroethylene-treated paper, cellophane, polyvinyl chloride, polystyrene or the like can be used.

Peelable protective layers are commercially available, such as those known under the name Silphan® films from the company Siliconature.

The at least one perfume is contained in the multi-layer patch to ensure olfactory perception.

The (at least one) fragrance is a uniform, defined chemical compound with odor (odoriferous substance), which preferably causes a pleasant sensation of smell in humans and therefore finds a variety of uses for the perfuming of technical and sanitary articles, soaps, cosmetics, personal care products and the like ,

For the purposes of the present description, however, also essences (a flavor extract usually obtained by alcoholic distillation) and flavors (industrially produced flavors which are chemically well defined, namely (1) natural flavoring agents, (2) nature-identical flavoring agents, (3) artificial flavorings, (4) flavoring extracts, (5) reaction flavors and (6) smoke flavors) to the fragrances.

The aroma extracts also include essential oils, d. H. plant-derived concentrates used as natural raw materials mainly in the perfumery and food industries and consisting of volatile compounds produced by steam distillation from vegetable raw materials.

In order to be perceived as an odor, fragrances must fulfill certain molecular requirements: low molecular weight (maximum 300 g / mol) with correspondingly high vapor pressure, surface activity, minimal water and high lipid solubility and weak polarity. A strongly hydrophobic and a weakly polar moiety are generally sufficient to induce sensory activity. The presence of osmophoric groups, such as. B. a partial structure with -OH, -OR, -CHO, -COR, -COOR (Euosmophore) can cause a pleasant odor effect. Furthermore, the stereochemistry, i. H. the spatial configuration of molecules, for the properties of a substance as a fragrance an important role.

Fragrances include: terpenoids, catechol derivatives, phenol derivatives, other aromatics, aliphatics, alicyclics and heterocycles.

However, fragrances are distinguished not only by their chemical structure but also by their odor properties. A systematic order does not take place here after chemical structural features, but after a smell characteristic. One arranges after "smell families" and after characteristic scents. Table: Odor classes (according to Rompp online, document RD-18-01394, Dec. 2007) odor class odoriferous characterization typical examples Flowery Floral scents (rose, jasmine, etc.) Geraniol, Jonon Citrus for citrus fruits Citral green Grass, green leaves Hex-3-en-1-ol Herbaceous green (spice) herbs thujone minty Peppermint, spearmint Menthone, (-) - carvone camphorous Celluloid, earthy camphor aldehyde greasy, waxy, ozone-like, watery Alkanals and alkene-1-ale C8-C13 Fruity fruity odors Fruit esters, lactones Süßbalsamisch after resins and chocolate vanillin Spicy spices eugenol woody after precious wood: cedar, sandalwood Santalol, Cedrol animalisch Musk, amber, civet Muscon, amber oxide, muscatel sage oil, civet

For the lacquer layer containing the at least one fragrance, suitable fragrances are, in particular, those which have a boiling point above 100 ° C. These are especially essential oils, i. Mixtures of volatile components, which are produced by steam distillation from vegetable raw materials.

Such essential oils ("fragrance oils") generally consist of volatile components whose boiling points are predominantly between 150 and 300 ° C. They contain predominantly hydrocarbons or monofunctional compounds, such as Aldehydes, alcohols, esters, ethers and ketones. Parent compounds are monoterpenes and sesquiterpenes, phenylpropane derivatives and longer chain aliphatic compounds. Accordingly, essential oils are relatively non-polar mixtures, ie they are soluble in most organic solvents. For many of the commercially important essential oils, the number of identified components is in the hundreds.

In particular, essential oils include those of field mint, agarwood, angelica root, anise, amyris, arnica, valerian, basil, bay, mugwort, benzoin, bergamot, birch, bitter orange, blue chamomile, blood orange, savory, bucco leaves, cajeput, calendula, cananga , Cascarilla, Cassia, Cistrose, Citronella, Clementine, Copaiva, Costus Root, Davana, Dill, Douglas Fir, Fir Fir, Oakmoss, Verbena, Elemi, Gentian, Tarragon, Eucalyptus, Fennel, Spruce, Galbanum, Galangal, Turmeric, Geranium, Ginger Grass, Gorse , Goldenrod, Grapefriut, Green anise, Guajac wood, Gurjunbalsam, Honey, Hops, Hyacinth, Immortelle, Ginger, Iris, Jasmine, St. John's wort, Cocoa, Calm, Chamomile, Camphor, Kanuka, Cardamom, Carrot, Pine needles, Garlic, Coriander, Spearmint, Cumin, caraway, larch, mountain pine, lavandin, lavender, lavender spica, lemongrass, lovage, lime, linaloe, litsea, laurel, mace, magnolia, mayonnaise, marjoram, tangerine, mandarin, manuka, sea pine, meli Mimosa, Musk, Sycamore, Myrrh, Myrtle, Nagarmotha, Nard, Narcissus, Carnation, Neroli, Niaouli, Orange, Origanum, Palmarosa, Patchouli, Peruvian Balsam, Parsley, Petit Grain, Pepper, Peppermint, Allspice, Poleyminze, Quendel , Tansy, Rhombus, Ravensara, Ravintsara, Rose, Rosewood, Rosemary, Roman Chamomile, Sage, Sandalwood, Santolin, Sassafras, Yarrow, Plum Lavender, Celery, Siamese, Styrax, Tobacco, Tagetes, Pine Cone, Tea Tree Oil, Turpentine, Thuja, Thyme, Tolubalsam, Tonka-Tonka, tuberose, vanilla, violet, vetiver, juniper, frankincense, silver fir, wormwood, meadow queen, wintergreen, worm seed, ylang-ylang, hyssop, cedar, cinnamon, stone pine, lemon, citronella, onion and cypress.

In a further preferred embodiment, in particular those fragrances are used which have no or only a low water solubility.

Furthermore, fragrances are preferred which have no alcoholic hydroxyl group.

Particularly preferred perfume are the fragrances and perfumes known in fine fragrance.

For fragrances having a boiling point lower than 100 ° C or those soluble in water, the addition of odorless, low volatility oils such as paraffins, alkylaromatics, esters or polyethylene glycols may allow their use in the perfume-containing lacquer layer (3).

Preferably, the fragrance used is also mixtures of fragrances which are referred to in the cosmetics industry as perfumes or perfume oils.

As already mentioned, in a further particular embodiment, the fragrance of the lacquer layer containing at least one fragrance may be contained in microcapsules. Processes for the preparation of perfume-filled microcapsules are disclosed in U.S. Pat US 3,516,941 . US 4,082,688 . US 4,277,364 . US 4,808,408 . US 5,043,161 and US 5,051,305 which is incorporated by reference.

The microcapsules are hollow spheres which have a hard shell ("capsule wall") and can have a diameter of between 5 and 80 μm. Usually, however, the microcapsules have a diameter below 30 microns, preferably between 6 and 15 microns. Inside the microcapsules of at least one fragrance and possibly other substances are included.

The size of the microcapsules can be adjusted continuously during production, which is influenced by the size of the droplets of the at least one perfume present as an oil-in-water emulsion in the reaction mixture. For further processing, however, the microcapsules obtained can also be given by filters with a corresponding pore size.

The capsule wall of these hollow spheres consists in a particular embodiment of a perfume-impermeable material, which prevents evaporation of the inside of the microcapsules perfume. In this case, the Fragrance can be released only after a previous mechanical destruction of the microcapsules from the multi-layer plaster.

However, it is also possible to use for the capsule wall materials which have a certain permeability to the fragrance inside the microcapsules. Such embodiments enable a time-delayed release of the fragrance from the fragrance-containing paint layer (3).

As material for the capsule walls thermosets come into question. These are plastics which are formed by irreversible and close-meshed crosslinking via covalent bonds of prepolymers, more rarely of monomers or polymers. The term "thermoset" is used both for the raw materials prior to crosslinking (reactive resins) and as a collective name for the cured, mostly completely amorphous resins.

Thermosets are steel-elastic at low temperatures, and even at higher temperatures they can not flow viscously, but behave elastically with very limited deformability. Duroplastics include, among others, the technically important substance groups of diallyl phthalate resins (DAP), epoxy resins (EP), urea-formaldehyde resins (UF), melamine-formaldehyde resins (MF), melamine-phenol-formaldehyde Resins (MPF), phenol-formaldehyde resins (PF) and unsaturated polyester resins (UP).

The materials used must be harmless from a toxicological point of view, which is ensured in the case of said thermosets. The capsule wall material can not be bacterially infested and consequently can not be a breeding ground for microorganisms.

Particular preference is given to melamine-formaldehyde resins, the curable condensation products of melamine and formaldehyde, which belong to the aminoplast. First, the melamine reacts with this aldehyde catalyzed acidic or basic to N-methylol compounds. At a longer reaction time or elevated temperature then react the methylol groups with further melamine to form methylene bridges or - in reactions of methylol groups with each other - of Methylol ether bridges. However, before these processes can lead to a closely networked, very hard, heat-resistant and completely insoluble resin, the reaction is usually maintained at the level of still soluble or meltable precondensates in order to submerge fillers. In order to improve the solubility of these precondensates, it is additionally possible to etherify a part of the still obtained methylol groups.

The final curing of the melamine-formaldehyde resins, also the modified ones, then takes place almost invariably at higher temperature in practice, i. above 100 ° C and predominantly in the presence of acidic accelerators. It proceeds with elimination of water and formaldehyde (with etherified products also with liberation of alcohol) to irreversibly crosslinked via methylene or methylene ether bridges thermosets.

Another preferred capsule wall material can be prepared by coacervation of gelatin, albumin or casein with cellulose derivatives such as methylcellulose, ethylcellulose, cellulose acetate, cellulose nitrate or carboxymethylcellulose (CMC) and a synthetic polymer such as polyamides, polyethylene glycols, polyacrylic acid copolymers, polyurethanes, epoxy resins and especially maleic anhydride, Copolymers of maleic anhydride such. Polyvinyl methyl ether / maleic anhydride copolymer (PVMMA) and ethylene-maleic anhydride copolymer (EMA). Particularly preferred is gelatin / polyvinyl methyl ether-maleic anhydride copolymer / carboxymethyl cellulose as capsule wall material.

The microcapsules are heat resistant up to 140 ° C, in the short term even up to 170 ° C.

By varying the wall thickness, the release properties of the microcapsules can be influenced in a simple manner. Thus, microcapsules can be produced which give off perfume over a long period of time, but also virtually odorless leather, which release the fragrance only under mechanical stress.

Preferred wall thicknesses of the microcapsules containing at least one perfume are in the range of 2-25 wt .-%, preferably 3-15 wt .-%, in particular 4-10 wt .-% capsule wall material, each based on the total weight of the microcapsules. The term wall thickness is to be understood as meaning the quantitative proportion of the capsule wall material based on the total weight of the microcapsules.

The microcapsules have a certain pressure stability and can therefore be used very well for printing on substrates. The microcapsules are applied in the form of a flowable mixture, preferably as a printing paste. The certain pressure stability ensures that the microcapsules in the corresponding printing process are not destroyed or only to a small extent. In the case of mechanical loading of the lacquer layer (3) containing the fragrance by the consumer - for example by rubbing - the microcapsules contained in this layer are destroyed and the fragrance is released.

In special embodiments, the microcapsules may also be perforated or depot capsules. A perforated capsule is understood to mean a microcapsule in which the capsule wall is not completely closed but has openings which facilitate the escape of the perfume contained in the microcapsules. A depot capsule is understood to be a microcapsule which, in addition to the at least one perfume, contains a carrier material which causes a delayed release of the perfume.

The microcapsules are produced by the coacervation known to the person skilled in the art or by the oil-in-water method.

The method for producing multilayer plaster with a lacquer layer containing at least one fragrance is characterized in that this lacquer layer is applied to the support layer by means of a printing process. The pressure medium used is a flowable mixture of the at least one perfume and the paint.

For the preparation of the lacquer layer, in principle, all known printing principles can be used, but "flat against round" and "round against round" are preferred. The term "flat against round" is understood to mean the principle of exerting a contact pressure on the printing material by the rotational movement of a printing cylinder onto the printing form. With the principle "around against round" the printing process works over two cylinders. The printing material is pressed via an impression cylinder to the forme cylinder and printed in this way.

Particularly suitable as printing processes are all high-pressure processes which are known to the person skilled in the art and which can be carried out with suitable printing machines. These machines include: (1) crucible presses, (2) stop cylinder presses, (3) rotary presses, and (4) Cameron high-pressure roll presses. But gravure printing methods are also suitable for producing the perfume-containing lacquer layer.

A particularly suitable form of a high-pressure process is flexographic printing. It is a web-fed rotary printing process in which the flexible carrier layer is printed with the printing medium (i.e., a flowable mixture of perfume and varnish). Since a short inking unit without numerous rollers is used in flexographic printing, it is also related to gravure printing. In this type of printing, the printing medium can also be applied through an anilox roller on the carrier layer (raster flexographic printing).

As a pressure medium serves - as I said - a flowable mixture of at least one perfume and the paint. If desired, this mixture may contain additives such as color pigments, solvents, other auxiliaries, drying accelerators, such as, for example, As alcohols, drying retarder such. As glycols, additives for abrasion resistance, flexibility and sliding behavior such. B. waxes and binders such. B. soluble resins. Preferably, the printing medium is free of color pigments.

In the printing medium, the fragrance may be present in a concentration of up to 35% by weight. Preferably, the content is between 1 and 30 wt .-%, more preferably between 5 and 25 wt .-%.

If the fragrance is present in microcapsules, its content in the printing medium can increase significantly. Fragrance-filled microcapsules may be present in the print medium in a proportion of up to 55% by weight, preferably between 2 and 35% by weight, and more preferably between 10 and 30% by weight.

The density of the pressure medium can be changed by adding fragrance-containing microcapsules. It can be between 650 and 1,400 kg m ^-3 , preferably between 850 and 1,200 kg m ^-3 .

The quantity of perfume transferred during the printing operation depends primarily on the concentration of the perfume or on the concentration of the microcapsules containing the at least one perfume in the printing medium. But also the fineness of the anilox rolls and the layer thickness influence the amount of perfume per multi-layer plaster.

The lacquer layer (3) containing the at least one perfume should generally be carried out over as few sharp edges as possible or between rollers, since any mechanical stress could cause bursting of the microcapsules and thus premature release of the perfume. The separate production of two laminates-wherein the first laminate contains the adhesive layer (1) and the peelable protective layer (4) and the second laminate the printed carrier layer (2) and the perfume-containing lacquer layer (3) - and the laminating of these two laminates ensures a particularly gentle production of the multi-layer plaster.

The multi-layer patch for application to the skin, which contains a) an adhesive layer, b) a printed backing layer and c) a lacquer layer containing at least one fragrance, can be used for the release of the fragrance into the environment, in particular after it has been applied to the skin a user was glued. The skin does not come into contact with the lacquer layer (3) containing the at least one fragrance.

In a preferred embodiment, the actual fragrance release is effected by mechanical stress by the user who destroys for this purpose microcapsules in the lacquer layer which contain the at least one fragrance, for example by rubbing.

Preferably, the fragrance release can be done as needed, which is possible after the application of the multi-layer plaster by more than one-time mechanical stress by the user.

The release of the fragrance may last up to 2 hours, preferably up to 6 hours, after a single mechanical stress. The period of fragrance release can be extended by a renewed mechanical stress and with a concomitant destruction of the microcapsules.

The product according to the invention can, of course, be glued to other surfaces besides the skin, for example to textiles, furniture, jewelery, paper etc.

Examples of production Example 1:

130 g of a 50% strength solution of Durotak 387-2287 in ethyl acetate are applied to a 760 mm wide sheet of Silphan 100 μm with a basis weight of 140 g / m ² . After removal of the solvent in the drying channel at a temperature of 30 to 90 ° C, a 65 micron thick adhesive layer (1), which is covered with a HDPE film. In this first laminate, the sheet of Silphan serves as a peelable protective layer (4) for the multi-layer plaster.

To produce the microcapsules, 1 kg of perfume oil is mixed with capsule material. Stirring produces a fine dispersion. This results in 800 g of microcapsules with a diameter of 8 microns, which are added to 3.12 kg of water-based paint. This gives 3.2 kg of a paste-like mass which can subsequently be used as the pressure medium.

In a further step, a one-sided aluminized PET film with a width of 760 mm is used as a printed carrier layer (2). On the printed side (2a), the previously prepared, containing microcapsules printing medium is then applied with a layer thickness of 0.01 mm. The water contained in it is removed by gentle drying. This results in a second laminate of printed carrier layer (2) and a lacquer layer (3) containing a fragrance, which has a layer thickness of 30 μm therein.

From the first laminate, the HDPE film serving as the cover layer is removed and the exposed adhesive layer is glued onto the aluminized inside (2i) of the unilaterally aluminized PET film of the second laminate.

Contours are then punched into the resulting product in such a way that the peelable protective layer is not severed. Overhanging punching residues are removed. After this "lattice", the peelable protective film (4) provided with the contour cut, individual, multi-layer plaster is cut transversely, placed on a lower packaging material web, covered with an upper packaging material web and guided into a sealing station. You get sealed bags containing at least one multi-layer plaster.

Description of the pictures

• FIG. 1 shows the schematic structure of a multi-layer plaster in cross section.
• FIG. 2 shows a multilayer plaster in plan view. The layers (1) to (3) are congruent and form the shape of a motif. The protective layer (4) is rectangular.

LIST OF REFERENCE NUMBERS

1. (1) = Kleberschicht
2. (2) = bedruckte Trägerschicht
3. (3) = Duftstoff enthaltende Lackschicht
4. (4) = abziehbare Schutzschicht

In the figures, the numbers have the following meaning:

1. (1) = adhesive layer
2. (2) = printed carrier layer
3. (3) = fragrance-containing varnish layer
4. (4) = peelable protective layer

Claims (11)

Multilayer patch for application to the skin, which contains an adhesive layer (1), a printed carrier layer (2), a lacquer layer (3) containing at least one fragrance, and a peelable protective layer (4). Product according to claim 1, characterized in that the at least one perfume is contained in microcapsules. Product according to claim 1 or 2, characterized in that the printed carrier layer (2) has an inner side (2i) which is aligned with the adhesive layer (1) and has an outer side (2a) which is aligned with the lacquer layer (3). Product according to one or more of claims 1 to 3, characterized in that the adhesive layer at least one polymer material from the group of poly (meth) acrylates, polyisobutylenes, polyterpenes, polyisoprenes, ethylene-vinyl acetate copolymers, synthetic rubbers, the Styrene-isoprene-styrene block copolymers, the styrene-butadiene-styrene block copolymers, hot-melt adhesives, vinylpyrrolidone-vinyl acetate copolymers, resins, waxes, mixtures of rubbers and resins, silicone pressure-sensitive adhesives, polyvinyl acetates, polyvinylpyrrolidones, polyvinyl alcohols, the polyethylene glycols containing polyethylene oxides and the cellulose derivatives. Product according to one or more of claims 1 to 4, characterized in that the printed carrier film comprises a film of polyester (PE), polyethylene terephthalate (PET), polybutylene terephthalate (PBT), polyvinyl chloride (PVC), ethylene-vinyl acetate copolymers (EVA), Polyvinyl acetate (PVA), polylactic acid (PLA), polyethylene (PE), polypropylene (PP), polyurethane (PU), cellulose derivatives or a laminate of at least one of these materials. Product according to one or more of claims 1 to 5, characterized in that the lacquer layer is produced from a printing lacquer, preferably from a water-based printing lacquer. Product according to one or more of Claims 1 to 6, characterized in that the fragrance has a uniform, defined chemical Compound with smell is, or at least one essence or at least one flavoring. Product according to one or more of Claims 2 to 7, characterized in that the microcapsules are produced from a duroplastic, preferably from a substance from the group consisting of diallyl phthalate resins (DAP), epoxy resins (EP), urea-formaldehyde resins ( UF), melamine-formaldehyde resins (MF), melamine-phenol-formaldehyde resins (MPF), phenol-formaldehyde resins (PF) and unsaturated polyester resins (UP). Method for producing a product which contains an adhesive layer (1), a printed carrier layer (2) and a lacquer layer (3) containing at least one fragrance and a peelable protective layer (4), characterized in that the lacquer layer (3 ) is applied to the printed carrier layer (2) by means of a printing process. A method according to claim 9, characterized in that a high-pressure process, in particular flexographic printing, is used as the printing process. Use of a product comprising an adhesive layer (1), a printed carrier layer (2) and a lacquer layer containing at least one perfume for releasing the at least one perfume into the environment.

Images