WO2023156748A1

WO2023156748A1 - Biodegradable material comprising fragrance, process and uses thereof

Info

Publication number: WO2023156748A1
Application number: PCT/FR2023/050226
Authority: WO
Inventors: Audrey Simon; Mélanie VEILLARD; Bertrand BALICHARD; Cassandre PERRAULT
Original assignee: Lactips
Priority date: 2022-02-18
Filing date: 2023-02-17
Publication date: 2023-08-24
Also published as: FR3132909A1

Abstract

The field of the invention is that of materials enabling integration and diffusion of volatile compounds, and materials comprising fragrance. More particularly, the present invention relates to a biodegradable material enabling integration and diffusion of volatile compounds that comprises casein and/or caseinate, and starch. This material may be used as a matrix for fragranced consumer products such as fragrance diffusers or fragrance enhancers.

Description

Title: Biodegradable material comprising perfume, method and uses thereof

Technical area

The field of the invention is that of materials making it possible to integrate and diffuse volatile compounds, and materials comprising perfume. In particular, the present invention relates to a biodegradable material capable of integrating and diffusing volatile compounds, and which comprises casein and/or caseinate, and starch. This material can be used as a matrix for scented consumer products like scent diffusers or scent enhancers.

Prior technique

[0002] Scented consumer products are increasingly appreciated by consumers. These products make it possible to deliver a pleasant perfume to the environment which surrounds them, they make it possible, for example, to perfume a room by using a room perfume diffuser, or a textile by using a perfume booster. Among these products, those using a solid matrix making it possible to diffuse perfume are commonly used. They generally comprise a solid support in which odorous molecules are integrated which are released by diffusion, or by dissolution of the solid support.

[0003] Different types of solid matrices can be used in these products. In the case of home fragrance diffusers, matrices comprising ethylene-vinyl acetate (EVA), or thermoplastic elastomers (TPE) are generally used. For fragrance boosters in laundry care, some products are intended for use during the washing of textiles, such as laundry fragrance beads to be used in combination with detergent in the washing machine. Water-soluble matrices based on polyethylene glycol (PEG) are then necessary.

[0004] Nevertheless, these matrices have disadvantages. Indeed, they are neither biodegradable nor biosourced. Furthermore, when the product must be used during the washing of textiles, the odor enhancers must be water-soluble, and not release microplastics. In the current context of the decrease in non-renewable resources and the increase in pollution linked to these resources, it is therefore necessary to find alternative solutions that are less polluting and more respectful of the environment.

[0005] Thus, the present invention aims to satisfy at least one of the following objectives. [0006] One of the objectives of the present invention is to provide a biodegradable material which can integrate and/or diffuse volatile compounds.

[0007] Another objective of the present invention is to provide a biobased material that can integrate and/or diffuse volatile compounds.

[0008] One of the objectives of the present invention is to provide a biodegradable material that can be used as a matrix for diffusing perfume.

[0009] One of the objectives of the present invention is to provide a biodegradable material that can be used as a solid matrix for perfumed consumer products.

[0010] One of the objectives of the present invention is to provide a biodegradable material which can be used as a matrix in a perfume enhancer for perfuming textiles.

[0011] One of the objectives of the present invention is to provide a biodegradable material that can be used as a matrix in a room fragrance diffuser.

One of the objectives of the present invention is to provide a water-soluble biodegradable material which can integrate and/or diffuse volatile compounds.

One of the objectives of the present invention is to provide a biodegradable material which can integrate and/or diffuse volatile compounds, the production process of which is simple to implement.

One of the objectives of the present invention is to provide a biodegradable material comprising volatile compounds.

One of the objectives of the present invention is to provide a scented biodegradable material.

[0016] One of the objectives of the present invention is to provide perfumed consumer products comprising a biodegradable and/or biobased material as a solid matrix.

Summary

[0017] This disclosure improves the situation. A biodegradable material is proposed characterized in that it comprises (in % by mass): a. between 10 and 55% casein and/or caseinate, preferably between 20 and 50%, preferentially between 25 and 45%; b. between 10 and 55% starch, preferably between 15 and 45%; vs. between 8 and 20% water, preferably between 12 and 17%; d. between 15 and 25% of at least one plasticizer d) different from c), preferably between 17 and 23%; summer. between 0.5 and 6% of at least one surfactant e), preferably chosen from zwitterionic surfactants whose HLB is between 2 and 8, said material being capable of integrating and diffusing volatile compounds f), the efficiency of integration of volatile compounds preferably being greater than or equal to 50%, and preferably greater than or equal to 65%.

The biodegradable material as described in the present application has many advantages. Indeed, this material is able to integrate and diffuse perfume and it has a sufficient absorption capacity to be able to be used as a matrix for the diffusion of perfumes, in particular in linen care or home fragrance applications.

[0019] Furthermore, this material can be 100% biobased and it is biodegradable. This material also has good water solubility, so it can be used as a matrix for odor enhancers in laundry care, such as beads for perfuming textiles during machine washing. Thanks to its composition, which includes natural polymers such as casein and starch, this material is biodegradable and avoids problems with the release of microplastics when used in the washing machine.

Thus, the invention also relates to a biodegradable material characterized in that it comprises (in % by mass): a. between 10 and 55% casein and/or caseinate, preferably between 20 and 50%, preferentially between 25 and 45%; b. between 10 and 55% starch, preferably between 15 and 45%; vs. between 8 and 20% water, preferably between 12 and 17%; d. between 15 and 25% of at least one plasticizer d) different from c), preferably between 17 and 23%; e. between 0.5 and 6% of at least one surfactant e), preferably chosen from zwitterionic surfactants whose HLB is between 2 and 8; and F. between 0.1 and 30%, preferably between 5 and 15%, of volatile compounds f).

[0021] The invention also relates to an object capable of being obtained after transformation by injection or extrusion of the biodegradable material. [0022] The invention also relates to the use of the biodegradable material for perfuming laundry or for perfuming a room.

The invention also relates to a process for manufacturing a biodegradable material, characterized in that it comprises the following steps:

1 . implementation of an extruder, preferably a twin-screw extruder;

2. introduction of compounds a) to e), and volatile compounds f), into the extruder;

3. extruding the biodegradable material;

4. recovery of the biodegradable material at the exit of the extruder; And

5. optionally, drying of the biodegradable material; step 2 preferably consisting in introducing (i) in a first step, at least a part of the compounds a) to e), and f), which are in solid form, and, (ii) in a second step, in the least a part of the compounds a) to e), and f), being in liquid form.

1 . implementation of an extruder, preferably a twin-screw extruder;

2. introduction of compounds a) to e) into the extruder, by introducing (i) initially, at least a portion of compounds a) to e), in solid form, and, (ii) in a second stage, at least part of the compounds a) to e) being in liquid form;

3. extruding the biodegradable material;

4. recovery of the biodegradable material at the exit of the extruder;

5. optionally, drying of the biodegradable material; And

6. optionally, (i) a step of impregnating the biodegradable material with volatile compounds f), or (ii) a step of extruding the biodegradable material with volatile compounds f).

[0025] The invention also relates to a process for manufacturing a biodegradable material comprising perfume, characterized in that it comprises (i) a step of impregnating the biodegradable material with volatile compounds f) or (ii) a step of extrusion of the biodegradable material with volatile compounds f).

detailed description [0026] By "biodegradable" is meant, for example, a material which can be decomposed under the action of microorganisms (bacteria, fungi, algae, etc.). The result of this decomposition is the formation of water, CO2 and/or methane and possibly by-products (residues, new biomass) that are not toxic to the environment. It is, for example, a biodegradable material according to European standard ISO14851. In the present application, the expression “biodegradable material” is used to designate the material as such, that is to say without taking into account the volatile compounds f) which may optionally be present in the material.

[0027] By “biobased”, we mean, for example, a product made from materials of biological origin. The bio-based carbon content can for example be determined according to ISO 16620-2:2019.

[0028] The term "water-soluble" means, for example, which dissolves in water. The water solubility of the granules of the biodegradable material can be measured as follows: 5g of granules are added to 1.5L of demineralised water at 30°C with stirring (1200 revolutions/min). The complete dissolution time is then measured. If after an hour and a half, the granules are completely dissolved (absence of particles), they are considered water-soluble.

[0029] By “between x and y”, we mean, for example, that the limits x and y are included in the interval [x, y],

[0030] By "plasticizer" is meant, for example, a substance making it possible to lower the glass transition temperature Tg of the material.

By "hydrophobic" is meant, for example, a compound having little affinity with water and having a tendency not to dissolve therein. Typically, it is a predominantly apolar compound.

By "hydrophilic" is meant, for example, a compound having an affinity with water and having a tendency to dissolve therein. Typically, it is a compound with polar groups capable of forming hydrogen bonds.

By "surfactant" is meant, for example, an amphiphilic molecule, that is to say a molecule possessing both hydrophilic and hydrophobic properties.

By "HLB" means, for example, the hydrophilic-lipophilic balance (in English: hydrophilic-lipophilic balance). The HLB value can be calculated using the following method: HLB=20 x (Molar mass of the hydrophobic part) / (Molar mass of the molecule). [0035] The term "sequestering agent" means, for example, ligands which form chemical complexes with metal ions such as copper, iron, nickel, calcium and magnesium.

By "fatty acid" is meant, for example, an aliphatic monocarboxylic acid.

[0037] By "thermoplastic" is meant, for example, a material which becomes malleable and bendable above a given temperature, the glass transition temperature Tg, but which below this Tg becomes hard again, these transformations being reversible.

[0038] The terms “volatile compounds” are to be taken in the broad sense and refer here to compounds or compositions which are used for the main purpose of diffusing into the environment an active principle having an activity in its environment. By "volatile compounds", we mean any product consisting of one or more molecules having a vapor pressure above atmospheric pressure at room temperature. It may, for example, be a perfume, an odor masking agent, an insecticide or an antimicrobial agent. In particular, volatile compounds can be used to impart or modulate odor. These are in particular odoriferous compounds or compositions which are capable of imparting a pleasant fragrance to their environment. These compounds can be of natural or synthetic origin. It may be a perfuming compound alone or a composition comprising several perfuming compounds. These compounds and compositions are well known to those skilled in the art who are able to select them on the basis of their general knowledge and according to the intended use or application. Preferably, the volatile compounds are perfume.

[0039] By “capable of integrating and diffusing volatile compounds”, is meant a material which can integrate volatile compounds into its mass and which is capable of releasing them in a deferred manner.

[0040] By “integration efficiency”, is meant the ratio between (i) the quantity of volatile compounds integrated into the material, this quantity being determined by gas phase chromatography, and (ii) the quantity of volatile compounds placed in work during the preparation of the material comprising volatile compounds (preferably during the extrusion of the biodegradable material with the volatile compounds). This ratio is then multiplied by 100 to obtain a percentage. Thus, the efficiency of integration can be described as follows:

Integration yield = quantity of integrated volatile compounds / quantity of integrated volatile compounds used *100

Unless otherwise indicated, the percentages are expressed by mass relative to the total mass of the material. The proportions of the different constituents a), b), c), d), e), and optionally f), g), h), and i) are expressed in % by mass relative to the total mass of the biodegradable material at room temperature.

Biodegradable material

[0042] The invention relates firstly to a biodegradable material characterized in that it comprises (in % by mass): a. between 10 and 55% casein and/or caseinate, preferably between 20 and 50%, preferentially between 25 and 45%; b. between 10 and 55% starch, preferably between 15 and 45%; vs. between 8 and 20% water, preferably between 12 and 17%; d. between 15 and 25% of at least one plasticizer d) different from c), preferably between 17 and 23%; e. between 0.5 and 6% of at least one surfactant e), preferably chosen from zwitterionic surfactants whose HLB is between 2 and 8, and f. between 0.1 and 30%, preferably between 5 and 15%, of volatile compounds f).

The biodegradable material comprises a) between 10 and 55% casein and/or caseinate, preferably between 20 and 50%, preferentially between 25 and 45%. According to one embodiment, the biodegradable material comprises a) between 35 and 45% casein and/or caseinate, preferably between 40 and 45%. According to another embodiment, the biodegradable material comprises a) between 25 and 34.5% casein and/or caseinate, preferably between 28 and 33%

[0044] Casein is a protein derived from milk which is poorly soluble in water. It is mainly obtained by precipitation by adding an acid (acid casein) or rennet (rennet casein) to the milk, or by filtration (miscellar casein). Casein consists of a mixture of α-casein, P-casein and K-casein having molar masses between 19,000 and 25,000 g/mol. By caseinate is meant, for example, a casein salt whose counter cation is chosen from the group comprising - preferably consisting of - calcium, potassium, ammonium, sodium and magnesium.

According to one embodiment of the biodegradable material, a) comprises at least one casein.

According to another embodiment of the biodegradable material, a) comprises at least one caseinate, for example a sodium caseinate, or a mixture of caseinates.

According to another embodiment of the biodegradable material, a) comprises a mixture of casein and at least one caseinate. In this case, the mass ratio between the casein and the caseinate(s) may be between 5/95 and 95/5, 20/80 and 80/20 or 40/60 and 60/40.

The biodegradable material comprises b) between 10 and 55% starch, preferably between 15 and 45%. According to one embodiment, the biodegradable material comprises at least 15% starch b). According to one embodiment, the biodegradable material comprises b) between 15 and 24.5% starch, preferably between 17 and 22%. According to another embodiment, the biodegradable material comprises b) between 25 and 35% starch, preferably between 28 and 33%.

Starch is a polysaccharide present in many plants. It is a mixture of two homopolymers, amylose and amylopectin, composed of D-anhydroglucopyranose (AGll) units which belong to the family of polysaccharides with the general chemical formula (CeH OsJn. The ratio between amylose and amylopectin depends on the botanical source of the starch.It can be a pea, corn, potato, wheat or rice starch.Starches are used in many fields either in the native state as ingredients or in the modified state, as additives, under the term "modified starches". In the food industry, modified starches correspond to the E 1400 series of the list of food additives. Starches modified can be obtained by physical, enzymatic or chemical treatment of the starch, Among these treatments, mention may be made of acid treatment or pregelatinization of the starch.

In this document, by "starch" is meant native starches that have not undergone transformation and modified starches. The starch can therefore be chosen from native starches, modified starches, and mixtures thereof. The starch can be chosen from pea, corn, potato, wheat, rice starches, and mixtures thereof.

The ratio of quantities a): b) may be between 90:10 and 30:70, preferably between 80:20 and 40:60, and preferably between 75:25 and 50:50. According to a particular embodiment, the ratio a):b) is between 45:55 and 55:45. According to another particular embodiment, the ratio a):b) is between 75:25 and 65:35.

The biodegradable material comprises c) between 8 and 20% water, preferably between 12 and 17%. The amount of water can be between 13 and 15%. Water acts as a plasticizer which must be distinguished from the plasticizer d) entering into the composition of the biodegradable material according to the invention.

The latter comprises d) between 15 and 25% of at least one plasticizer different from c), preferably between 17 and 23%.

This plasticizer d) can be chosen from polyols, glycerol acetates, glycerol propionates and mixtures thereof. As examples of polyols, mention may be made of glycerol, hexanetriol, glycols, including ethylene glycol, and sugars and their derivatives.

As examples of sugars, mention may be made of disaccharides such as maltose, lactose, sucrose and monosaccharides such as fructose.

Among the sugar derivatives, mention may be made of their hydrogenated derivatives such as sorbitol, maltitol, mannitol, and xylitol, or even the transformation products of these hydrogenated derivatives such as sorbitan.

According to one embodiment of the biodegradable material, the plasticizer d) is chosen from glycerol, sorbitol, mannitol, ethylene glycol and mixtures thereof. Preferably, the plasticizer d) is chosen from glycerol, sorbitol, and mixtures thereof. According to one embodiment, the plasticizer d) is glycerol.

The plasticizer d) makes it possible to lower the viscosity of the product by increasing the mobility of the molecular chains.

Advantageously, the plasticizer d) is a hydrophilic plasticizer.

The biodegradable material comprises between 0.5 and 6% of at least one surfactant e), preferably chosen from zwitterionic surfactants whose HLB is between 2 and 8, and preferably the surfactant e) is lecithin .

Advantageously, the biodegradable material comprises between 1 and 5% of at least one surfactant e), preferably between 1.5 and 4.5%, and even more preferably between 2 and 4%.

Among the preferred surfactants, mention may be made of lecithin and/or its analogues such as diacetylene phosphonates and polysorbates. Polysorbates are fatty acid esters of polyoxyethylene sorbitan. Among the polysorbates, mention may be made of polysorbate 20, polysorbate 40, polysorbate 60, and polysorbate 80.

The biodegradable material can comprise g) between 0.1 and 8% of a hydrophobic agent, preferably between 1 and 4%. Advantageously, the biodegradable material comprises between 0.5 and 6%, preferably between 1 and 3%, of a hydrophobic agent g).

The hydrophobic agent g) can be chosen from:

- polycarboxylic acid esters;

- C3-C33 carboxylic acids, preferably C4-C28 fatty acids, and even more preferably C6-C28 unsaturated fatty acids;

- and mixtures thereof. The polycarboxylic acid esters can be derived from at least one polycarboxylic acid and from at least one alcohol, preferably a Ci-C alcohol.

Among the polycarboxylic acids preferably retained in the context of the invention, mention may be made of citric acid, hydroxycitric acid, tartaric acid, malic acid, oxalic acid, malonic acid, succinic acid, glutaric acid, adipic acid, maleic acid, fumaric acid.

Among the preferred alcohols in accordance with the invention, mention may be made of C2-C6 alcohols, such as for example ethanol, n-propanol, /so-propanol, n-butanol and tert- butanol.

According to one embodiment of the biodegradable material, the hydrophobic agent g) is chosen from triethyl citrate, tributyl O-acetyl citrate, tributyl citrate and mixtures thereof.

According to one embodiment, the hydrophobic agent g) is a C3-C33 carboxylic acid, preferably a C4-C28 fatty acid, and even more preferably an unsaturated C6-C28 fatty acid.

Among the C4-C28 fatty acids used in the context of the invention, mention may be made of caprylic acid, capric acid, lauric acid, myristic acid, palmitic acid, stearic acid, and mixtures thereof.

Among the C6-C28 unsaturated fatty acids of particular interest, mention may be made of palmitoleic acid, oleic acid, linoleic acid, and mixtures thereof.

According to one embodiment of the biodegradable material, the ratio of the quantities of g) to e) is greater than or equal to 1. For example, this ratio can be between 1.3 and 3; preferably between 1.5 and 2.5.

According to one embodiment of the biodegradable material, said material also comprises an additive h) chosen from dyes, pigments, protein coagulants, anti-caking agents, slip agents and mixtures thereof. Examples of coagulants include citric acid and acetic acid. Among the anti-caking agents, mention may be made of colloidal silica. Among the slip agents, mention may be made of polyethylene glycols and compounds with fatty chains, preferably C12-C28, having an amide termination. The biodegradable biodegradable material may comprise between 0.01% and 5% h).

According to one embodiment of the biodegradable material, said material comprises between 1 and 5% of an additive i) chosen from sequestering agents. Among the sequestering agents, mention may be made of diammonium citrate, EDTA, phosphates, citric acid, pyrophosphates, and mixtures thereof. Advantageously, the biodegradable material is capable of integrating and diffusing volatile compounds f), the yield of incorporation of volatile compounds preferably being greater than or equal to 50%, preferably greater than or equal to 65%. The yield of incorporation of the volatile compounds can be greater than or equal to 55%, 60%, 65%, 70% or 75%. It can for example be between 65 and 95% or between 75 and 90%.

As the biodegradable material is capable of integrating volatile compounds f), it can therefore contain volatile compounds f), preferably perfume, in certain cases.

The invention therefore also relates to a biodegradable material characterized in that it comprises (in % by mass): a. between 10 and 55% casein and/or caseinate, preferably between 20 and 50%, preferentially between 25 and 45%; b. between 10 and 55% starch, preferably between 15 and 45%; vs. between 8 and 20% water, preferably between 12 and 17%; d. between 15 and 25% of at least one plasticizer d) different from c), preferably between 17 and 23%; e. between 0.5 and 6% of at least one surfactant e), preferably chosen from zwitterionic surfactants whose HLB is between 2 and 8, and f. between 0.1 and 30%, preferably between 5 and 15%, of volatile compounds f).

According to one embodiment, the biodegradable material comprises volatile compounds f), for example it contains more than 0.1% of volatile compounds f), preferably between 0.1 and 30%, and preferably between 5 and 15%. The content of volatile compounds f) depends on the desired use, the person skilled in the art can therefore adjust it accordingly.

When the material comprises volatile compounds f), these can be in several forms, they can for example be encapsulated, or be in free form. Volatile materials in free form can be in liquid form. According to one embodiment, the material comprises volatile compounds f) in free form, the volatile compounds are then dispersed in the biodegradable material. According to one embodiment, the material comprises volatile compounds f), and at least part of the volatile compounds f) is encapsulated. In some cases, it can be advantageous if all of the volatile compounds f) are encapsulated, for example, this can help the volatile compounds to deposit on the textiles.

[0081] The fact of using encapsulated volatile compounds for perfumed consumer products is well known to those skilled in the art and is for example described in WO2021185736. It is in particular known to use volatile compounds contained in microcapsules, where the microcapsule is a polymer matrix.

According to a second embodiment, the biodegradable material does not contain volatile compounds f), for example it contains less than 0.1% of volatile compounds f).

[0083] The biodegradable material can be water-soluble. According to a particular embodiment, the biodegradable material does not comprise volatile compounds f) and it is more than 80% biobased, preferably more than 90%, and more preferably 100%.

According to one embodiment, the biodegradable material, which comprises volatile compounds f), is more than 80% biobased, preferably more than 90%, and more preferably 100%. This percentage is understood to exclude the content of volatile compounds f).

Use of biodegradable material

The biodegradable material can be in several forms, it can for example be in the form of granules or in the form of a film. The invention also relates to granules of biodegradable material. The invention also relates to a film of biodegradable material.

The biodegradable material can be thermoplastic. Thus, the invention also relates to an object capable of being obtained after transformation by flat die extrusion, blow extrusion, inflation extrusion, solvent route, calendering, injection, thermoforming or spinning of the biodegradable material. In particular, mention may be made of the films likely to be obtained from the thermoplastic material.

The biodegradable material can be used as a solid matrix in consumer products, that is to say products making it possible to deliver an active principle to the environment which surrounds them. Mention may be made in particular of scented consumer products, i.e. products that deliver a pleasant scent to the environment that surrounds them. Thus, the present invention also relates to a consumer product, preferably a scented consumer product, preferably a room fragrance diffuser or an odor enhancer for laundry care, comprising the biodegradable material.

According to one embodiment, the biodegradable material is used to perfume laundry or perfume a room.

The biodegradable material can be used in a room fragrance diffuser, for example to perfume a room or the passenger compartment of a car. [0090] Thanks to its good water solubility, the biodegradable material can also be used in a perfume booster for laundry care, such as laundry perfume beads for use in the washing machine.

Method of manufacturing a biodegradable material

The invention also relates to a process for manufacturing a biodegradable material, comprising the following steps:

1 . implementation of an extruder, preferably a twin-screw extruder;

2. introduction of the compounds a) to e), and of the volatile compounds f), into the extruder;

3. extruding the biodegradable material;

4. recovery of the biodegradable material at the exit of the extruder; And

5. optionally, drying of the biodegradable material, step 2 preferably consisting in introducing (i) initially, at least some of the compounds a) to e), and f), which are in solid form, and, ( ii) secondly, at least part of the compounds a) to e), and f), being in liquid form.

1 . implementation of an extruder, preferably a twin-screw extruder;

3. extruding the biodegradable material;

4. recovery of the biodegradable material at the exit of the extruder;

5. optionally, drying of the biodegradable material; And

Advantageously, step 1) consists in operating the extruder with the following parameters: speed of rotation between 100 and 300 rpm, and at a temperature between 50 and 120°C. In step 2), compounds a) to e) are introduced simultaneously or successively, preferably successively.

In a preferred embodiment, the compounds in solid form, advantageously in powder form, are compounds a), b) and e); while the compounds in liquid form are compounds c), d).

The biodegradable material recovered in step 4 can be in the form of a rod. In this case, the method can also comprise a step of drying the rod and/or a step of cutting the rod into granules.

When the material contains volatile compounds f), it is possible to incorporate them in several ways.

According to a first embodiment, the volatile compounds f) are introduced into the extruder at the same time as the compounds a) to e) which are in liquid form.

According to a second embodiment, the thermoplastic material is first manufactured without adding the volatile compounds f). The material obtained is then returned to the extruder with the volatile compounds f) to be re-extruded.

According to a third embodiment, the thermoplastic material is first manufactured without adding the volatile compounds f). The material obtained is then impregnated with the volatile compounds f) according to techniques well known to those skilled in the art. Among the possible techniques, mention may in particular be made of soaking in a bath comprising the volatile compounds f) or spraying. Impregnation can also be done in a mixer.

According to one embodiment, the yield of incorporation of volatile compounds f) is preferably greater than or equal to 50%, preferably greater than or equal to 65%. The incorporation yield of volatile compounds can be greater than or equal to 55%, 60%, 65%, 70% or 75%. It can for example be between 65 and 95% or between 75 and 90%.

Examples

[0102] Granules were prepared by extrusion as follows.

The extruder used is a BC 21 co-rotating twin-screw extruder of the Clextral® brand, with a diameter of 25 mm, a center distance of 21 mm and a length of 900 mm. This extruder comprises at least 4 zones: a first introduction zone, a second introduction zone comprising a degassing zone, and a third die zone. The rotational speed of the twin screws is 175 and 320 rpm and the temperatures of the different zones are between 30 and 120°C.

The first zone of the extruder is a zone for introducing the powders: caseinate, lecithin, and pea starch if necessary. The liquids (plasticizers and perfume if applicable) are introduced into the second zone. The extruder further comprises a third zone consisting of a cylindrical rod die with a diameter of 4 mm.

The auger profile is as follows: 750 mm direct pitch auger, 50 mm mixing auger, 100 mm reverse pitch auger.

On leaving the extruder, the rod is dried and introduced into a granulator to give granules 2 to 3 mm in diameter.

[0105] Example 1

[0106] Fragrance-free granules are prepared. The composition of the granules obtained is given in Table 1.

[0107] [Table 1]

The dissolution time of these granules was measured as follows:

5g of granules are added to 1.5L of demineralized water at 30°C with stirring (1200 rpm). The complete dissolution time is then measured.

[0109] [Table 2]

The results show that the biodegradable material according to the invention, comprising caseinate and starch, makes it possible to reduce the dissolution time of the granules, compared to those not comprising starch.

[01111 Example 2

[0112] Granules comprising perfume were also prepared, using formulation 1 and the comparative formulation. Perfume was added during extrusion. The same quantity of perfume was added in both cases for a target quantity of perfume of 8%. The results are shown in Table 3. [0113] The quantity of perfume integrated is determined by assay by GC/MS/FID.

The integration efficiency is then calculated as follows: quantity of perfume measured/quantity of perfume used *100

[0115] [Table 3]

The results show that the biodegradable material according to the invention, comprising caseinate and starch, makes it possible to improve the amount of perfume incorporated into the material. Thus, the biodegradable material according to the invention comprising perfume can be used in perfumed consumer products.

[0117] Tests were also carried out to determine whether it was possible to incorporate the perfume in different ways:

1. in a first step, manufacture of the perfume-free granules (formulation 1 according to the invention), then in a second step, the granules are put back into the extruder with the perfume and re-extruded in the same way as above.

2. firstly, manufacture of perfume-free granules (formulation 1 according to the invention), then impregnation of the granules by soaking in perfume.

In both cases, it is possible to obtain a biodegradable material comprising perfume.

Claims

[Claim 1] Biodegradable material characterized in that it comprises (in % by mass): a. between 10 and 55% casein and/or caseinate, preferably between 20 and 50%, preferentially between 25 and 45%; b. between 10 and 55% starch, preferably between 15 and 45%; vs. between 8 and 20% water, preferably between 12 and 17%; d. between 15 and 25% of at least one plasticizer d) different from c), preferably between 17 and 23%; summer. between 0.5 and 6% of at least one surfactant e), preferably chosen from zwitterionic surfactants whose HLB is between 2 and 8; f. between 0.1 and 30%, preferably between 5 and 15%, of volatile compounds f).

[Claim 2] Biodegradable material according to Claim 1, characterized in that at least a part of the volatile compounds f) is encapsulated.

[Claim 3] Biodegradable material according to one of the preceding claims, characterized in that the mass ratio a) casein and/or caseinate: b) starch is between and 90:10 and 30:70, preferably between 80:20 and 40:60, and preferably between 75:25 and 50:50.

[Claim 4] Biodegradable material according to one of the preceding claims, characterized in that the starch is chosen from native starches, modified starches, and mixtures thereof.

[Claim 5] Biodegradable material according to one of the preceding claims, characterized in that the plasticizer d) is chosen from polyols, glycerol acetates, glycerol propionates, and mixtures thereof, preferably d) is chosen from glycerol , sorbitol, and mixtures thereof.

[Claim 6] Biodegradable material according to one of the preceding claims, characterized in that the surfactant e) is lecithin.

[Claim 7] Biodegradable material according to one of the preceding claims, characterized in that it is water-soluble.

[Claim 8] Granules of the biodegradable material according to one of the preceding claims.

[Claim 9] Object obtainable after transformation by injection or extrusion of the biodegradable material according to any one of Claims 1 to 7, or of the granules according to Claim 8.

[Claim 10] Use of the biodegradable material according to any one of Claims 1 to 7, or of the granules according to Claim 8, for perfuming laundry or for perfuming a room.

[Claim 11] A scented consumer product, preferably a room fragrance diffuser or laundry care odor enhancer, comprising the biodegradable material according to any one of claims 1 to 7, or granules according to claim 8.

[Claim 12] Process for manufacturing a biodegradable material according to any one of claims 1 to 7, characterized in that it comprises the following steps:

1 . implementation of an extruder, preferably a twin-screw extruder;

3. extruding the biodegradable material;

4. recovery of the biodegradable material at the exit of the extruder; And

[Claim 13] Process for manufacturing a biodegradable material according to any one of claims 1 to 7, characterized in that it comprises the following steps:

1 . implementation of an extruder, preferably a twin-screw extruder;

3. extruding the biodegradable material;

4. recovery of the biodegradable material at the exit of the extruder;

5. optionally, drying of the biodegradable material; And

6. (i) a step of impregnating the biodegradable material with volatile compounds f), or (ii) a step of extruding the biodegradable material with volatile compounds f).