Long-lasting scented cleaning products

Abstract

The present invention provides a scented cleaning product with extended persistence. In particular, the invention provides the implementation of a combination of a first fragrance in free form, and a second microencapsulated fragrance within the composition of a biocidal, disinfectant, deodorant and / or cleaning cleaning product, and in which the microencapsulated fragrance has an optimized composition to improve the persistence of the olfactory notes of the first free fragrance. The invention also provides adapting the type of microcapsules used depending on the treated support and the desired use for the cleaning product and the stabilization in suspension of the scented microcapsules by means of a thickening gum and a micro-fibrillated cellulose.

Description

Title of the invention: Scented cleaning products with prolonged persistence TECHNICAL FIELD OF THE INVENTION

[0001] The present invention relates to the field of cleaning products incorporating perfumed microcapsules in a cationic medium.

[0002] The invention finds applications in increasing the persistence of a perfume associated with a maintenance product, such as a biocidal, disinfectant, cleaning, detergent, and / or deodorant product, etc. STATE OF THE ART

[0003] Whether it is intended to be applied to our skin or our clothes, as a room fragrance or air freshener, or for cleaning and / or disinfecting a surface, a “traditional” perfume is the result of a harmonious formulation of three types of notes, which evaporate gradually according to their volatility: the “top notes” (or flight), whose lightness leads to their total disappearance most often in less than half an hour, to allow the “heart notes” to express themselves for around 4 hours thanks to the “base notes” (or trail) which fix and enhance the fragrances of the “heart notes” (or theme). Both the most concentrated and the least volatile, the “base notes” have a lifespan of around 24 hours, or even a few days.These optimal longevity periods are only observed in ideal conditions that favor the fixation of the perfume, particularly on fibrous surfaces on which we move and / or with which we are in contact - knowing that the intensity of the trail of a perfume naturally diminishes over time.

[0004] We most often choose a perfume based on its top notes, which are at the same time very fresh, light and volatile, they constitute the most ephemeral and least concentrated part of a perfumed composition, and our olfactory memory is essentially based on the originality, intensity and persistence of the two other types of fragrances constituting a perfume: its heart and base notes.

[0005] Traditionally, the theme and the trail of a perfumed composition complement and harmoniously prolong its flight by replacing it with more persistent fragrances because they are less volatile, and clearly more concentrated: theme and trail represent approximately 80 + / - 5% VOL. of the mixture of perfumed compounds constituting the perfume base of a perfume.

[0006] The traditional composition of a perfume may possibly be modified in order to optimize its olfactory properties or the user experience. For example, patent EP 2 810 663 B1 proposes a method for preparing a composition scented allowing a user to easily distinguish two fragrance accords in a deodorant product, such as vanilla and rose. To this end, the fragrance composition would comprise at least two accords, each formulated with key fragrance raw materials, chosen to have similar odor detection thresholds, and whose concentration is controlled in the base and / or top notes of said composition.

[0007] In the field of cleaning products, the perception of the fragrance associated with the product is directly linked to the perception of cleanliness by users. It is therefore desirable to increase the persistence of the fragrance as much as possible. A known solution consists of including scented microcapsules within the composition of the product, the microcapsules allowing the fragrance to be gradually released, whether by passive diffusion or by rupture of the microcapsules. It is also known to incorporate the same fragrance into a cleaning product composition, in two forms: "free" and microencapsulated, so that the free fragrance is immediately released, and the microencapsulated fragrance is gradually released. Patent EP 2 990 471 A1 of the Applicant gives an example of a disinfectant product comprising a fragrance in free and microencapsulated form.In this document, the microcapsules are stabilized in a disinfectant product, however the fragrance of the product only has a persistence on hard surfaces of about two to four hours.

[0008] In the field of cosmetics, US patent 6,653,277 B1 proposes a perfume in which the accords are released successively by means of microcapsules, a first group of microcapsules releasing the most volatile olfactory notes, and a second group of microcapsules releasing less volatile olfactory notes, and in which the first group of microcapsules has a lesser wall thickness than those of the second group.

[0009] These solutions make it possible to prolong the persistence of a perfume in a relatively effective manner. However, there is still a need for new solutions, particularly suited to the field of cleaning products, and the maintenance of a perceptible perfume for long periods. Similarly, it is necessary to guarantee the homogeneous dispersion and stability in suspension of the microcapsules, particularly in a cationic medium. Statement of the invention

[0010] The aim of the present invention is to propose a perfumed cleaning product with prolonged persistence, making it possible to perceive the presence of the perfume for at least 6 hours, and preferably 10 hours or up to 24 hours or more.

[0011] To this end, the invention proposes several solutions which can be combined with each other to increase the persistence of the perfume as much as possible. A first solution concerns the optimization of the homogeneity of the dispersion, and the stability in suspension of the perfumed microcapsules within the composition of the cleaning product. A second solution is to optimize the diameter of the microcapsules according to the concentration of microcapsules and the intended use of the cleaning product. A third solution consists of implementing a combination of a first free perfume and microcapsules containing a second perfume with reduced top notes, and the optimization of the relative contents of heart and base notes.

[0012] In particular, the invention provides a liquid and water-soluble maintenance product having a biocidal composition comprising:

[0013] -a quaternary ammonium salt preferably chosen from benzalkonium chloride, didecylammonium chloride, didecyldimethylammonium chloride or a mixture of these;

[0014] -an amino alcohol;

[0015] -an alcohol;

[0016] -a base composed of a metal hydroxide;

[0017] -a sequestering agent;

[0018] -a non-ionic surfactant; and characterized in that it comprises;

[0019] a combination of a first perfume and microcapsules containing a second perfume, and

[0020] -a rheological agent composed of diutan gum.

[0021] Advantageously, diutan gum proved to be the only one of the rheological agents tested capable of guaranteeing the homogeneous and stable dispersion of the combination of the first perfume (called "free perfume") and the perfumed microcapsules in the presence of the quaternary ammonium salt. This homogeneous dispersion makes it possible to better control the supply of perfume by users and to guarantee a stable and homogeneous suspension of the microcapsules over time. It will also be possible to increase the level of perfumed microcapsules in the product. Depending on the embodiment of the invention, the first perfume may be equal to or different from the second perfume.

[0022] In a preferred embodiment, the composition also comprises a dispersing agent chosen from a partially neutralized dispersing acrylic acid homopolymer, preferably in a mass concentration of 0.1 to 0.5%. Advantageously, this makes it possible to avoid the formation of elastic filaments of the chewing gum type when the product is discharged into the pipes.

[0023] Preferably, said disinfectant composition comprises the following mass concentrations: -0.5 to 5% of the quaternary ammonium salt; -0.5 to 5% amino alcohol; -0.1 to 15% alcohol; -0.1 to 10% of an organic solvent chosen from a glycol ether; -0.1 to 1% sodium hydroxide; -0.5 to 5% sequestering agent; -1 to 8% of non-ionic surfactants; -0.01 to 0.2% diutan gum; -0.2 to 2% of the first flavor; -0.2 to 3.5% of the microcapsules containing said second perfume. -demineralized water qsp 100%

[0024] The mass concentrations are expressed relative to the total weight of the composition, and this throughout the document. In one embodiment, the maintenance product of the invention is a concentrated biocidal product intended for dilution before use and comprises: -2 to 5% of the quaternary ammonium salt -1 to 2% of the first flavor and -2 to 3.5% of the microcapsules containing said second perfume, and characterized in that it also comprises: - 2 to 8% of micro-fibrillated cellulose, and preferably 2 to 8% of an organic solvent chosen from a glycol ether.

[0025] Advantageously, the above composition is optimized to incorporate higher concentrations of microcapsules and quaternary ammonium salt.

[0026] According to one embodiment, the microcapsules have an average diameter of between 12 and 18 μm, and particularly 15 μm. This choice is advantageous for a product concentrated in microcapsules and their maintenance in stable suspension.

[0027] According to a particular embodiment, the product comprises a mixture of scented microcapsules: - a first group of scented microcapsules called “A” having an average diameter of between 12 and 18 pm, and particularly 15 pm, -and a second group of perfumed microcapsules called “B” having an average diameter of between 6 and 12 pm, particularly 10 pm, and in which the mixture of type A microcapsules is in the majority, and preferably the mass ratio of microcapsules A:B is between 80:20 and 95:05, and is more preferably 90:10. The microcapsules B (minority) will make it possible to prolong the persistence of the perfume, without compromising the stability of the suspension.

[0028] In another embodiment, said product is a ready-to-use biocidal product and comprises: -0.5 to 1.5% of the quaternary ammonium salt -0.2 to 0.8% of the first flavor and -0.2 to 1% of the microcapsules containing said second perfume, said microcapsules having an average diameter of between 6 and 12 pm, and particularly 10 pm. This product makes it possible to prolong the persistence of the perfume for more than 24 hours.

[0029] Either, said disinfectant product comprises: - a first group of scented microcapsules called “A” having an average diameter of between 12 and 18 pm, and particularly 15 pm, -and a second group of scented microcapsules called “B” having said average diameter between 6 and 12 pm, particularly 10 pm, and in which the mixture of type B microcapsules is in the majority, and preferably the mass ratio of microcapsules A / B is between 40:60 and 05:95, and is more preferably 10:90.

[0030] In a preferred embodiment for increasing the persistence of the perfume, said first perfume comprises a perfume base consisting of perfumed compounds with variable volatility and defining the olfactory notes of said first perfume, characterized in that: - the second perfume comprises a perfume base based on perfume compounds present in the first perfume, and in which perfume compounds having the highest volatility in the first perfume, called top notes, are present in the second perfume at a mass concentration reduced by at least 60% compared to their concentration in the first perfume, and preferably reduced between 60% and 95%, or between 70% and 90%.

[0031] Said top notes correspond to perfume compounds having a vapor pressure >0.01 mmHg, or no longer being able to be detected predominantly in the first olfactory notes felt from the first perfume by a "nose" after 30 minutes of its application on a perfume test cardboard strip.

[0032] Finally, the invention also relates to a method for manufacturing a perfumed cleaning product, said cleaning product being a liquid cleaning, biocidal, disinfecting and / or deodorizing composition, and comprising: - a step of obtaining said liquid cleaning, biocidal, disinfectant and / or deodorizing composition; - a step of adjusting the viscosity of said composition between 100 and 300 cP by means of a thickening gum chosen from xanthan gum and diutan gum, -a step of adding a slurry to said composition, said slurry comprising a first flavor and microcapsules containing a second flavor in said composition, and - a homogenization step by stirring and obtaining said scented cleaning product.

[0033] The invention will be better understood upon reading the following description and examining the non-limiting examples which accompany it. DETAILED DESCRIPTION OF THE INVENTION

[0034] The general objective of the invention is to improve the persistence of the olfactory notes of a perfume of a maintenance product, such as a cleaning product, biocide, deodorant, disinfectant or possibly a cosmetic product.

[0035] Another aim of the invention is to provide a perfumed cleaning product with persistent olfactory notes, concentrated or ready to use, and suitable for cleaning hard surfaces such as floors or fibrous surfaces such as textiles and leathers, i.e. a multi-purpose product suitable for both types of surfaces.

[0036] For these purposes, the invention proposes a first solution for optimizing the homogeneity of the dispersion and the stability of the suspension of perfumed microcapsules within a cleaning product. Indeed, despite the presence of emulsifying surface agents and surfactants in cleaning products, the stability and homogeneity of the distribution of the microcapsules can deteriorate over time, in particular with creaming and sedimentation of the microcapsules. In order to limit the occurrence of these phenomena, the present invention proposes increasing the viscosity of the cleaning product by means of a thickening agent of the polysaccharide polymer type. In particular, the Applicant proposes using a thickening gum to adjust the viscosity of the product to around 100-300 cP (at room temperature), and / or at a concentration of 0.01 to 0.2%.

[0037] In one embodiment, the maintenance product is in an anionic or neutral medium and the thickening gum is xanthan gum.

[0038] In another embodiment of the invention, the maintenance product is in a cationic medium and the thickening gum is advantageously diutan gum. This solution makes it possible to stabilize the microcapsules in homogeneous suspension in a cationic medium, such as in a disinfectant product incorporating a quaternary ammonium salt. On the contrary, other theoretically compatible rheological agents have not made it possible to stabilize the microcapsules in a cationic medium. For example, sodium alginates, xanthan gum, precipitated silicas, Acusol 880® (hydrophobically modified non-ionic polyol), Rheovis TT A ® (aqueous dispersion of a copolymer based on methacrylic acid and acrylic acid esters). However, a new problem arises when such a concentrated disinfectant product is discharged into the pipes and diluted with water.Indeed, the Applicant noticed that the presence of diutan gum leads to the formation of chewing gum-type filaments when the cleaning product is in a cationic medium, and that it is diluted when it is discharged into the pipes with water. In order to overcome this in . Conveniently, the invention proposes to use a partially neutralized dispersing homopolymer, such as the product marketed by BASF under the name Sokalan® PA25 CL PN, CAS number 68479-09-4 (2-Propenoic acid, telomer with sodium hydrogen sulfite, sodium salt).

[0039] The invention also provides a solution for stabilizing a concentrated disinfectant cleaning product intended for dilution before application. Indeed, this product requires a higher concentration of quaternary ammonium salt and perfumed microcapsules. In order to guarantee the homogeneous dispersion of said microcapsules, the invention proposes adjusting the rheology of the composition of the product with a mixture of diutan gum and microfibrillated cellulose. The microfibrillated cellulose is, for example, that marketed under the trade name Exilva®. The mixture of these components has proven essential for maintaining the microcapsules in stable suspension, whereas these agents used individually have not given satisfactory stability results over time. Preferably, such a product also comprises an organic solvent chosen from a glycol ether, such as butyl diglycol.The latter makes it possible to improve the stability of the microcapsule suspension, as well as to solubilize the quaternary ammonium salt and the free perfume.

[0040] In one embodiment, the maintenance product has a water-soluble liquid biocidal composition comprising:

[0041] -a quaternary ammonium salt preferably chosen from benzalkonium chloride, didecylammonium chloride, didecyldimethylammonium chloride or a mixture of these; - an amino alcohol; -an alcohol; - a base composed of a metal hydroxide; - a sequestering agent; - a non-ionic surfactant; and characterized in that it comprises; a combination of a first fragrance and microcapsules containing a second fragrance, and - a rheological agent composed of diutan gum, and preferably

[0042] a partially neutralized acrylic acid homopolymer.

[0043] The quaternary ammonium salt is used as a biocidal agent. The use of sodium hydroxide or potassium hydroxide significantly enhances the virucidal action (action against viruses), as well as giving a basic pH to the composition. Its concentration is chosen to adjust the final pH between 11 and 12. When the detergent solution is applied in contact with ambient air, carbon dioxide dissolves sufficiently quickly, producing carbonic acid and rapidly causes acidification. environmental protection.

[0044] Amino alcohols, or amino alcohols, are organic compounds that contain both an amine functional group and an alcohol functional group. Their role is to activate the disinfectant and biocidal action of the quaternary ammonium salt. The amino alcohol is preferably 2-aminoethanol, which has been determined to be the best partner for enhancing the activity of disinfectant agents, including the ammoniums and alcohols in the composition. The alcohol used is preferably ethanol. The sequestrant is a complexing agent such as ((2-(biscarboxymethylamino)ethyl)carboxymethylamino)acetic acid, or its tetrasodium salt, also known as EDTA. Preferably, the sequestrant is methyl-glycine-diacetate (MGDA), or a chelating agent such as glutamic N,N-diacetic acid (GLDA) or sodium gluconate or mixtures thereof.The surfactant is a non-ionic surfactant, for example a C12-C14 ethoxylated alcohol, such as poly(oxyethylene) lauryl ether.

[0045] The nature of the microcapsules will also be chosen to ensure compatibility with the composition of the intended maintenance product. In one embodiment, the microcapsules are of the melamine-formaldehyde type. In particular, the microcapsules contain from 20 to 40% perfume, from 1 to 2% of an emulsifying agent, from 2 to 4% of acetic acid and 2 to 4% of a polymer prepared from melamine (the weight percentages are given here relative to the total mass of the microcapsules in the composition). The polymer prepared from melamine is a methylated melamine-formaldehyde resin with an average molecular weight of approximately 432 and a linear formula (C4H8N2O)n, sold in suspension in 1% butanol under its English name “poly(melamine-co-formaldehyde) methylated” by the company ALDRICH™, and referenced under the CAS number: 68002-20-0. In another embodiment, the microcapsules are obtained from a bio-sourced material.The nature of the capsule is not limiting and can be cationic, anionic, or neutral in nature.

[0046] On the other hand, the invention proposes to define the dimensions of the microcapsules to further control the release of the microencapsulated perfume, and in particular by using a mixture of microcapsules of different average diameters. Indeed, the average diameter of the microcapsule will be decisive for its fragility, and the release mechanism of the product. For example, the Applicant has noticed that microcapsules with a thin wall, and a larger diameter are suitable for continuously diffusing a perfume, or immediately following the rupture of their wall by crushing, as well as for obtaining a stable and homogeneous dispersion of a product relatively concentrated in microcapsules (2 to 5%). On the contrary, the thickness of the wall of a microcapsule with a small diameter is greater, and these microcapsules release the fragrance very slowly by microdiffusion or following the rupture of their wall by crushing, for example when they are trampled on the ground or activated by friction. These latter microcapsules can significantly increase the persistence of the fragrance of a cleaning product, but can in certain cases compromise the stability of the product.

[0047] The invention thus proposes to define a specific ratio of microcapsules having a predefined diameter to control the release over time of the microencapsulated perfume, and to adapt this ratio to a intended use of the product.

[0048] In one embodiment, the invention proposes to implement a mixture of perfumed microparticles, a first group of microparticles called "A" having an average diameter preferably less than or equal to 20 pm, particularly from 12 to 18 pm, and very particularly from 12 to 16 pm, and a second group of microcapsules called "B" having a diameter preferably less than or equal to 12 pm, particularly from 4 to 10 pm, and very particularly from 6 to 10 pm. In particular, for products intended for applications on hard surfaces, the invention proposes to use a mixture of microcapsules comprising mainly microcapsules A, and comprising at least a mass fraction of 5% to 20% of microcapsules of type B, and preferably close to 10%. Microcapsules A allow the fragrance to be diffused continuously for more than 10 hours and microcapsules B allow the continuous micro-diffusion to be extended to more than 20 hours.On the contrary, a majority use of type B microcapsules leads to the phase shift of the product.

[0049] For a ready-to-use maintenance product intended for application to textiles, a majority proportion of type B capsules will be preferred. Advantageously, a mixture of microcapsules may also be used to make the product suitable for use on textiles and / or hard surfaces. The product then comprises a mixture of microcapsules comprising mainly B microcapsules, and comprising from 5% to 45% of type A microcapsules, and preferably close to 10%.

[0050] In one embodiment, an average diameter of microcapsules has a Gaussian Diameter Distribution (RGD) of ± 2 pm.

[0051] The solution of the invention can be implemented with any type of micro-encapsulation technology of an active ingredient making it possible to obtain a particle of the order of a micrometer, and including core-membrane type microcapsules, microspheres with a matrix system, micro-capsules, porous spherical particles, etc. The microencapsulation of perfumes is a ubiquitous practice in the fields of detergent and cosmetic formulation, and micro-encapsulation techniques will not be dealt with in the present invention, they further comprise polymer rization in dispersed medium by radical or anionic route (suitable for microspheres of 0.1 to 15 pm), interfacial polycondensation (suitable for microcapsules of 0.5 to 50 pm), and interfacial polyaddition (suitable for microcapsules of 0.2 to 5 pm). Documents EP2379047A1, EP3092069A1 and US 6,592,990 describe methods for manufacturing perfumed microcapsules.

[0052] Finally, the invention also proposes the implementation of a combination of a first perfume in free form, and a second microencapsulated perfume within the composition of a maintenance or cosmetic product, and in which the microencapsulated perfume has an optimized composition to improve the persistence of the olfactory notes of the first free perfume. This solution applies to any type of maintenance product, as well as cosmetic.

[0053] In the present invention, the first fragrance in free form, also called parent fragrance or "free fragrance", corresponds to a fragrance already assigned to a product known to the public and whose persistence over time is desired to be improved, or to a new fragrance that is desired to be assigned to a product, whether new or existing. By free fragrance is meant that this fragrance is incorporated freely in the composition of the product and can diffuse directly from within the composition to the environment and / or the surfaces on which the product is applied. This first fragrance has conventional formulation characteristics and according to which the perfumed composition comprises several perfuming compounds of variable volatility constituting a fragrance of said fragrance, and being chosen to act as top notes, heart notes or base notes of the fragrance.

[0054] As already mentioned, the top notes are the most quickly perceptible aromatic compounds, but which also evaporate quickly and after about 20 to 30 minutes, the heart notes persist for up to 8 hours, and the base notes for up to 24 hours or more under ideal fixation conditions. The perfumer matches the heart and base notes to the top notes, so that they constitute a lasting and harmonious olfactory relay, but different from the top notes which they replace entirely.

[0055] The “Nose”, a person skilled in the art, will naturally be able to identify which compounds are used as top notes, heart notes and base notes in one of his perfume compositions. Indeed, he himself has chosen these top, heart and base notes to create his perfume. However, when it comes to analyzing an unknown composition of a perfume, it can be more difficult to identify the compounds used as top, heart and base notes. This is because each perfume is the result of a creation for which the “Nose” also uses intermediate notes of the “top-heart” and “heart-base” type which allow him to generate new perfume compositions while achieving a harmonious olfactory accord.

[0056] For the sake of clarity and for the purposes of description, top notes, middle notes and base notes may be identified based on their vapor pressure as follows:

[0057] - Top notes: perfume compounds with a vapor pressure >0.01 mmHg, or can no longer be detected predominantly, by a trained nose, in the first olfactory notes felt by the perfume 30 minutes after its application to a perfume test strip. A trained nose is defined as the nose of an experienced perfumer.

[0058] - Heart notes: aromatic compounds with a vapor pressure between 0.01 mmHg and 1.0 x 103mmHg;

[0059] - Base notes: aromatic compounds with a vapor pressure < 1.0 x 103mm Hg.

[0060] For example, 2-undecanone (Methyl Nonyl Ketone) is a fragrance component providing a fruity, oily, citrus odor and its vapor pressure is 0.03mm Hg (20°C), this compound is therefore a top note according to the present invention.

[0061] In particular, the present invention proposes to modify the composition of a first conventional perfume, also called parent perfume, so as to obtain a modified perfume making it possible to increase the olfactory persistence of the parent perfume. In particular, the invention proposes to reduce the relative content of top notes of said first parent perfume by at least an AT of -60% compared to its mass concentration in the perfuming base of the parent perfume (mass percentage, weight by weight, expressed without solvent or additives). It is however desirable to retain at least 5 or 10% of the content of top notes of the parent perfume, so that the modified perfume provides a pleasant and natural experience of the parent perfume when it is released late.

[0062] Advantageously, the Applicant has demonstrated that the controlled release of this modified perfume makes it possible to significantly increase the persistence of the heart and base notes of the first parent perfume, and in particular when the modified perfume is microencapsulated and incorporated into a cleaning product containing the first parent perfume in free form.

[0063] A cleaning product thus perfumed is particularly advantageous in professional use for cleaning premises by an external service provider during off-peak hours. In this case, personnel entering the cleaned or treated area perceive the olfactory notes even several hours after the application of the product. The solution of the invention therefore makes it possible to retain the perception of a perfume, and this several hours after the application of the cleaning product.

[0064] It would also appear that the solution of the invention makes it possible to improve the stability of the microcapsules. Indeed, the high volatility of the top notes is

[0065]

[0066] suspected of reducing the tightness of the microcapsule membrane, thus leading to early release of the perfume. The microencapsulated perfume of the invention having a reduced content of top notes, would thus prevent the early release of the perfume from the microcapsule. Preferably, the modified perfume, by reducing the relative content of top notes, makes it possible to increase the relative contents of heart and / or base notes. The relative contents of heart notes "C" and base notes "F" being increased proportionally to the reduction in the relative content of top notes, the ACF percentage therefore depends on the initial relative content of top notes of the first perfume. In a preferred embodiment, the content of base notes and heart notes is increased by an ACF between 1% and 20%. Table I below shows examples of parent fragrances and their modified fragrances according to the invention, and demonstrates an increase in their persistence when incorporated in the form of scented microencapsules in a cleaning product. The scented compositions are expressed in relative mass contents (weight by weight) and considering only the concentrations of the fragrance compounds without the solvent or any additives.

[0067] Perfume Type Olfactory Notes Parent Perfume % Mass Modified Perfume % Mass %A 1 Spicy Perfume Top Notes (T) 18.9 4.7 AT= -75.1 % Heart Notes (C) 46.2 51.7 Base Notes (F) 34.9 43.6 Heart & Base Notes C+F 81.1 95.3 ACF= +17.5 % 2 Oriental Perfume Top Notes (T) 6.7 2 AT= -70.1 % Heart Notes (C) 45.8 29.4 Base Notes (F) 47.5 68.6 Heart & Base Notes C+F 93.3 98 ACF= +7.2 % 3 Woody Perfume Top Notes (T) 0.193 0.045 AT= - 76.7 % Heart Notes (C) 66.92 62.29 Base Notes (F) 32.89 37.67 Heart & base notes C+F 99.81 99.96 ACF= +0.15%

[0068] EXPERIMENTAL PART

[0069] 1. Formulation of a disinfectant maintenance product comprising a combination of free perfume and microencapsulated perfume in the form of a stable suspension.

[0070] Table 2 below shows examples of formulation of disinfectant cleaning products based on a quaternary ammonium salt, and comprising a combination of free perfume and microencapsulated perfume in suspension. Formula I is suitable for disinfectant cleaning products for hard surfaces to be diluted before application. Formula II is intended for a ready-to-use disinfectant cleaning product for use on textiles and / or hard surfaces. The free perfume and the microencapsulated perfume are incorporated into the cleaning product in the form of a so-called "slurry" mixture generally comprising 40% to 50% (weight by weight) of said microcapsules in suspension in an aqueous solution or in 40 to 50% of free perfume and approximately 10% of emulsifying surfactants.Preferably, the slurry comprises a mass fraction of 10 to 40%, and in particular 15 to 35% of microcapsules suspended within a perfumed composition whose viscosity is adjusted to be close to that of the intended cleaning product. The microcapsules contain approximately 85% perfume (weight for weight). The slurry is homogenized before incorporation with moderate stirring into the product in its final preparation phase.

[0071] [Tables2] Name Function Formula I in % mass fraction Formula II in % mass fraction Quaternary ammonium ion compounds, C8-C[8]alkyl benzyldimethyl chlorides Biocide 0 to 1 0 to 0.5 Quaternary ammonium salt, didecyldimethylammonium chloride DDAC Biocide 2 to 3 0.5 to 1 Lauryl poly(oxyethylene) ether Non-ionic surfactants 2 to 3 1 to 2 capryl / capryl methyl glucamide Non-ionic surfactant 1.5 to 2 0.1 to 0.6 Sodium hydroxide Base 0.1 to 1 0.1 to 0.5 Ethanol 1% MEK Alcohol 1 to 10 1 to 10 Butyldiglycol Solvent 1 to 10 1 to 10 Monoethanolamine amino alcohol 0.5-1.5 0.1-1 Diutane gum Agent rheological 0.05-0.3 0.03-0.1 Microfibrillated cellulose Rheological agent 5 to 10 - Acrylic acid homopolymer Dispersing agent 0.2 to 0.5 0.1 to 0.3 “Free” perfume Perfume 0.7 to 2 0.2-0.8 Perfumed microcapsules “microencapsulated perfume” Perfume 2.0 to 3.5 0.2 to 1 Water Diluent qsp 100 qsp 100

[0072] Comparative tests were carried out to evaluate the persistence of the perfume of a cleaning product according to formula I of table 2 above, and using the 3 types of perfume from Table I. In particular, products were formulated by incorporating a combination of free perfume and microencapsulated perfume modified or not according to the invention. These products are applied diluted to 5% on tiled floors (see Table 3) and the perception of their perfume in the cleaned room is determined 2, 4, and 6 hours after its application. The results show that the perfume of the control product (combination of free perfume and unmodified microencapsulated perfume) is perceptible in the treated room after 2 hours, and sometimes up to 4 hours after application. In comparison, a perfume persistence of up to 6 hours is observed for the cleaning products incorporating the combination of free perfume and perfume modified according to the invention, as well as a greater perception of perfume after 2 hours and 4 hours compared to the control product.Therefore, these results demonstrate that microencapsulation of a fragrance modified to reduce the top note content of the parent fragrance can significantly extend the persistence of the olfactory notes of a cleaning product's fragrance.

[0073] 2. Optimization of the release of the perfume of a cleaning product according to its destination of use.

[0074] Maintenance products were formulated according to Table 2, formula I and formula II with microcapsules of different average diameters. A first group of microcapsules called A has an average diameter of 15 μm, and the second group of microcapsules called B has an average diameter of 10 μm (RGD ±2 μm).

[0075] Initial tests (not shown) have shown that type A microcapsules are best suited for formulating concentrated products of formula I (intended for aqueous dilution before use) and for increasing the persistence after cleaning of hard surfaces such as the floor. In addition, type A microcapsules prove to be best suited for obtaining a stable dispersion of microcapsules in a “concentrated to diluter” cleaning product and therefore more concentrated in perfumed microcapsules. In contrast, the majority use of type B microcapsules in a product of formula I leads to a phase shift of the product.

[0076] Similarly, type B microcapsules prove to be the best suited for diffusing a perfume onto a textile when activated by friction or crushing, as well as for increasing the persistence of a perfume from a product of formula II (ready to use). In comparison, a majority use of type A microcapsules in this same product results in a significantly lower persistence of perfume.

[0077] It is however possible to optimize the release of the microencapsulated perfume by using a mixture of microcapsules A and B containing a modified perfume. Table 3 shows examples of cleaning products of formula I and II, and having an optimized ratio of microcapsules of type A and B. Formula I is diluted to 5% in water and applied using a mop on tiled floors. Formula II is sprayed directly onto textiles (chairs, carpets, rugs).

[0078] [Tables3] Test Formula Concentration in the formulation of the cleaning product Ratio microcapsules A / B 1 Formula I Free perfume 0.7%, perfumed microcapsules 2.5% 70 / 30 2 Formula I Free perfume 1.2%, perfumed microcapsules 2.2% 80 / 20 3 Formula I Free perfume 1.2%, perfumed microcapsules 2.2% 90 / 10 4 Formula II Free perfume 0.3%, perfumed microcapsules 0.4% 10 / 90 5 Formula II Free perfume 0.5%, perfumed microcapsules 0.8% 10 / 90 6 Formula II Free perfume 0.6%, perfumed microcapsules 0.7% 10 / 90

[0079] Table 4 below shows the results on the persistence of the perfume following the application of the products in Table 3. In particular, the persistence is rated from 0 to 3, and in which: 0 = no scent perception; 1 = pleasant atmosphere, feeling of freshness; 2 = slight perception of a scent; and 3 = pronounced perception of perfume.

[0080] The perception of the scent is noted by the users of the room near the cleaned surface, in particular at about 50 cm from the surface, and in interaction with the surface. For example, for the floor this interaction corresponds to walking on the floor, and on textiles to changing position on a chair or even walking on a carpet or a previously treated rug.

[0081] [Tables4] Olfactory test Perfume persistence After 10h After 24h After 48h Test Near the surface In interaction with the surface Near the surface In interaction with the surface In interaction with the surface El 2 2 NA 1 NA E2 2 2 1 1 NA E3 2 2 1 1 NA E4 3 3 2 2 2 E5 1 1 NA 2 2 E6 1 1 2 2 2

[0082] These results show that all of the products formulated according to the invention allow for a perfume persistence after 10 h and up to 24 h. In particular, the majority use of microcapsules with an average diameter of 10 μm allows the persistence of the product to be extended up to 48 h.

Claims

Claims

1. Maintenance product having a liquid biocidal composition comprising: - a quaternary ammonium salt preferably chosen from benzalkonium chloride, didecylammonium chloride, didecyldimethylammonium chloride or a mixture thereof; - an amino alcohol; - an alcohol; - a base composed of a metal hydroxide; - a sequestering agent; - one or more non-ionic surfactants; and characterized in that it comprises; a combination of a first perfume and microcapsules containing a second perfume, and - a rheological agent composed of diutan gum.

2. A product according to claim 1, said composition comprising a dispersing agent selected from a partially neutralized acrylic acid homopolymer.

3. A cleaning product according to claim 1 or 2, said biocidal composition comprising the following mass concentrations: - 0.5 to 5% of the quaternary ammonium salt; - 0.5 to 5% of amino alcohol; - 0.1 to 15% of alcohol; - 0.1 to 10% of an organic solvent chosen from a glycol ether; - 0.1 to 1% of sodium hydroxide; - 0.5 to 5% of sequestering agent; - 1 to 8% of non-ionic surface agent(s); - 0.01 to 0.2% of diutane gum; - 0.2 to 2% of the first perfume; - 0.2 to 3.5% of microcapsules containing said second perfume; and demineralized water.

4. Maintenance product according to one of the preceding claims, in which said product is a concentrated biocidal disinfectant product intended for its dilution before use and comprises the following mass concentrations: -2 to 5% of the quaternary ammonium salt -1 to 2% of the first perfume and -2 to 3.5% of microcapsules containing said second perfume, and characterized in that it also comprises: -2 to 8% of a micro-fibrillated cellulose.

5. A cleaning product according to claim 4, also comprising from 2 to 8% of an organic solvent chosen from a glycol ether.

6. Product according to one of claims 4 or 5, in which the microcapsules have an average diameter of between 12 and 18 pm, and particularly 15 pm.

7. Product according to one of claims 4 or 5, said product comprising a mixture of scented microcapsules: - a first group of scented microcapsules called "A" having an average diameter of between 12 and 18 pm, and particularly 15 pm, - and a second group of scented microcapsules called "B" having an average diameter of between 6 and 12 pm, particularly 10 pm, and in which mixture the microcapsules of type A are in the majority, and preferably the mass ratio of microcapsules A:B is between 55:45 and 95:05, and more preferably 90:

10.

8. Maintenance product according to one of claims 1 to 3, in which said product is a ready-to-use biocidal product and comprises: - 0.5 to 1.5% of the quaternary ammonium salt - 0.2 to 0.8% of the first perfume and - 0.2 to 1% of microcapsules containing said second perfume, said microcapsules having an average diameter of between 6 and 12 pm, and particularly 10 pm.

9. Maintenance product according to claim 8, said product comprising a mixture of microcapsules: - a first group of perfumed microcapsules called "A" having an average diameter of between 12 and 18 pm, and particularly 15 pm, - and a second group of perfumed microcapsules called "B" having said average diameter of between 6 and 12 pm, particularly 10 pm, and in which mixture the microcapsules of type B are in the majority, and preferably the mass ratio of microcapsules A / B is between 45:55 to 05:95, and more preferably 90:

10.

10. Maintenance product according to one of the preceding claims, in which said first perfume comprises a perfume base consisting of perfumed compounds with variable volatilities and defining the ol- notes factors of said first perfume, characterized in that: - the second perfume comprises a perfume base based on perfume compounds present in the first perfume, and in which perfume compounds having the highest volatility in the first perfume, called top notes, are present in the second perfume at a mass concentration reduced by at least 60% compared to their concentration in the first perfume, and preferably reduced between 60% and 95%, or between 70% and 90%.

11. A product according to claim 10, wherein said top notes correspond to fragrance compounds having a vapor pressure >0.01 mmHg, or no longer predominantly detectable in the first olfactory notes sensed of the first fragrance by a nose 30 minutes after its application to a fragrance test cardboard strip.