Microcapsule and method for producing the same, and consumer product including microcapsule

Abstract

To provide an environmentally friendly, novel fragrance microcapsule, containing plant-derived ingredients as the primary raw material, ensuring superior stability over time, while exhibiting sufficient fragrance performance in consumer products.SOLUTION: The present invention provides a microcapsule and a method for producing the same. The microcapsule is of the core-shell type, with a fragrance contained in the core. The shell is composed of a cellulose derivative, a polyisocyanate having at least two isocyanate functional groups, and glucomannan.SELECTED DRAWING: None

Description

[Technical field]

[0001] The present invention relates to a core-shell type microcapsule using a cellulose derivative, a method for producing the same, and a consumer product using the microcapsule. [Background technology]

[0002] The use of encapsulation technology to control the release of fragrances is well known in many industries. Capsules based on condensation polymers containing urea, melamine and formaldehyde are used in various consumer products to control the release of fragrances. However, formaldehyde is considered to be carcinogenic, and the presence of formaldehyde in the final product is a social problem. As such, microcapsules that do not use formaldehyde, such as microencapsulated fragrances using acrylic (see Patent Document 1) and urethane (see Patent Document 2), are known. On the other hand, in recent years, in consideration of the impact on the environment and human body, there has been an increasing demand to minimize the use of fossil raw materials and to use environmentally friendly materials using plant-derived ingredients in consumer products. For example, Patent Document 3 discloses a method for producing microcapsules using cellulose as a plant-derived ingredient. That is, this is a method for producing microcapsules in which cellulose is used as the wall membrane, coacervate is induced with dextrin, polyvinyl alcohol, etc., and the wall membrane is hardened with polyphenols. However, these fragrance microcapsules using plant-derived ingredients do not have sufficient fragrance-producing performance in consumer products or lack the stability over time to maintain sufficient fragrance-producing performance for a long period of time in consumer products, so there has been a demand for the development of fragrance microcapsules with excellent performance. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] International Publication No. 2015 / 016368 [Patent Document 2] JP 2019-167455 A [Patent Document 3] JP 2017-176907 A Summary of the Invention [Problem to be solved by the invention]

[0004] The inventors have investigated various methods for producing environmentally friendly fragrance microcapsules using plant-derived ingredients based on these prior art technologies that do not contain formaldehyde, but when used in consumer products such as fabric softeners, they are unable to exhibit sufficient fragrance performance, and their stability over time in consumer products is also insufficient, so they have been unable to find a production method for storing the microcapsules stably for long periods of time. [Means for solving the problem]

[0005] In order to solve the above problems, the present inventors have conducted extensive research and found that the addition of at least one polyisocyanate having at least two isocyanate groups as a reinforcing agent for the microcapsule membrane greatly improves the fragrance performance in consumer products. Furthermore, the present inventors have found that the use of glucomannan, the main component of konjac, in combination as an additive dramatically improves the stability of the fragrance microcapsules in consumer products and also dramatically improves the fragrance performance, leading to the completion of the present invention. That is, the present invention relates to the following [1] to

[11] . [1] A core-shell type microcapsule comprising a core and a shell, The shell is Ingredient (1): Cellulose derivative Component (2): at least one polyisocyanate having at least two isocyanate groups Ingredient (3): Glucomannan in polymerized form, A microcapsule comprising a fragrance composition as the core. [2] The microcapsule according to [1] above, wherein the component (1) is selected from the group consisting of methyl cellulose, carboxymethyl cellulose, hydroxypropyl cellulose, hydroxypropyl methyl cellulose, hydroxyethyl cellulose, hydroxyethyl methyl cellulose, and mixtures thereof, and is contained in an amount of 0.1% by mass to 30% by mass of the total mass of the microcapsule. [3] The microcapsule according to any one of [1] and [2] above, wherein the component (2) is selected from the group consisting of hexamethylene diisocyanate, toluene diisocyanate, isophorone diisocyanate, pentamethylene diisocyanate, xylylene diisocyanate, or their isocyanurates, biuret forms, trimethylolpropane adducts, and combinations thereof, and is contained in an amount of 0.01% by mass to 15% by mass of the total mass of the microcapsule. [4] The microcapsule according to any one of the above [1] to [3], wherein the component (3) is contained in an amount of 0.01% by mass to 5% by mass of the microcapsule. [5] The microcapsule according to any one of the above [1] to [4], characterized in that it contains dextrins and / or polyvinyl alcohols. [6] The microcapsule according to any one of the above [1] to [5], which contains polyphenols. [7] A method for producing the microcapsules according to any one of the above [1] to [6], comprising the following steps a to f: (a) dissolving the components (1) and (3) in water; (b) mixing component (2) with a fragrance composition; (c) adding the mixture obtained in (b) to the aqueous solution obtained in (a) to emulsify or disperse the mixture to form an emulsion; (d) adding dextrins to the emulsion; (e) adding polyphenols to the emulsion; (f) forming a shell by heating the emulsion. [8] The method for producing the present invention described in [7] above, wherein the dextrins added in the step (d) have a dextrose equivalent in the range of 2 to 30. [9] The method according to any one of claims 7 to 8, wherein the polyphenols added in step (e) are selected from the group consisting of tea extract, tannic acid, and combinations thereof.

[10] An aqueous composition containing the microcapsules according to any one of [1] to [6] above.

[11] A consumer product comprising the microcapsules and / or the microcapsule-containing aqueous composition according to any one of [1] to [6] above. Effect of the Invention

[0006] According to one aspect of the present invention, it is possible to obtain novel environmentally friendly fragrance microcapsules that are made primarily from plant-derived components and that can fully exhibit fragrance-producing performance in consumer products and have excellent stability over time. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0007] In the following, unless otherwise specified, % refers to % by mass. In this specification, the term "shell" refers to the outer shell that forms a microcapsule particle, i.e., the so-called capsule membrane, and the term "core" refers to the active ingredient encapsulated by the shell. It is known that the fragrance-releasing performance of fragrance microcapsules decreases over time in consumer products such as fabric softeners. This is due to the microcapsules bursting in the consumer product and releasing the core, or due to the structure of the microcapsule shell causing the core to leak out in the consumer product. This phenomenon is known to those skilled in the art as "leakage" or "fragrance leakage." Since the fragrance leakage reduces the fragrance-releasing performance of the microcapsule over time, the ability to prevent this is an important performance for microcapsules. Hereafter, the ability to prevent fragrance leakage from microcapsules may be referred to as the "temporal stability of microcapsules."

[0008] Hereinafter, an embodiment of the method for producing microcapsules according to the present invention and the microcapsules produced by this method will be described in detail. The method for producing the microcapsules according to the present invention is carried out by using a simple coacervation method. The core of the microcapsule is generally a fragrance composition that is liquid at room temperature, and a cellulose derivative is used as the main component forming the microcapsule wall. Furthermore, a small amount of polyisocyanate and glucomannan are used as reinforcing agents for the microcapsule wall. The core preferably constitutes 50% or more of the total mass of the microcapsule, more preferably 75% or more, and even more preferably in the range of 85% to 90%. The core comprises a combination of one or more perfumes and, depending on its intended use, may also contain non-perfume substances. Hereinafter, the mixture of the perfume or perfumes and, optionally, the non-perfume substances, will be referred to as the perfume composition. The fragrance composition may contain useful ingredients other than the fragrance depending on the intended use, etc. Examples of useful ingredients include deodorants, antibacterial agents, insect repellents, cooling agents, fragrance precursors, antioxidants, moisturizers, whitening agents, anti-wrinkle agents, etc.

[0009] It is desirable that the flavor composition does not exhibit a solid-liquid phase change at normal temperatures to which consumer products are subjected, that is, it is preferable that the flavor composition does not exhibit a phase change at temperatures from -20°C to 120°C. Since it is necessary for the fragrance composition to form a stable emulsion in the manufacturing process of the microcapsules, it is desirable that the solubility in water is low. In general, it is well known to those skilled in the art that the solubility of a substance in water can be expressed by its CLogP. In this case, CLogP refers to a calculated water / octanol partition coefficient. As an alternative to the CLogP of the fragrance composition, the sum of the products of the mass ratios of each component of the fragrance composition and its CLogP can be used. This sum is preferably in the range of 2.0 to 6.0, more preferably 3.0 to 5.0. The fragrance composition may optionally contain a diluent acceptable for fragrance. The diluent is preferably an oil-miscible solvent with a large CLogP. Preferred diluents include isopropyl myristate, benzyl benzoate, diethyl phthalate, and the like. On the other hand, water-miscible solvents such as ethanol, propylene glycol, dipropylene glycol, and butylene glycol are often not suitable for improving the performance of microcapsules, and it is desirable to use them at the lowest possible concentration. From the viewpoint of stability over time of the microcapsules, the fragrance molecules contained in the fragrance composition are preferably bulky molecules. Bulky molecules usually pass through the shell of the microcapsules and leak out less than non-bulky molecules, so the stability over time of the microcapsules is high. Specific examples of bulky molecules include, but are not limited to, the compound groups shown in Table 1.

[0010] [Table 1] TIFF2025011829000002.tif177145 TIFF2025011829000003.tif187145 TIFF2025011829000004.tif177145 TIFF2025011829000005.tif187145

[0011] The molecular weight of each component contained in the flavor composition is preferably relatively large. In the case of fragrance and flavor components, the molecular weight is about 60 to 350, and there is no particular limitation for other components, but generally, a molecular weight of about 100 to 1000 is preferably used.

[0012] The cellulose derivative may be a water-soluble cellulose ether in which the hydrogen atom of the hydroxyl group of cellulose is substituted with at least one group of an alkyl group or a hydroxyl alkyl group. Specifically, methylcellulose (MC), carboxymethylcellulose (CMC-Na), hydroxypropylcellulose (HPC), hydroxypropylmethylcellulose (HPMC), hydroxyethylcellulose (HEC), hydroxyethylmethylcellulose (HEMC), or a combination thereof may be used. The amount of the cellulose derivative added, whether excessive or insufficient, inhibits good capsule membrane formation. The amount is preferably 0.1% to 30%, more preferably 0.5 to 20%, and even more preferably 1.0 to 10% of the total mass of the microcapsule.

[0013] The polyisocyanate must have at least two isocyanate groups in order to form a film. The polyisocyanate includes aromatic polyisocyanates and aliphatic polyisocyanates, and further includes, as derivatives thereof, adducts such as biuret, isocyanurate, and trimethylolpropane adducts, but is not limited thereto. Also, a combination of a plurality of them may be used. The type and amount of polyisocyanate added greatly affect the fragrance performance and stability over time of the microcapsules. If the amount of polyisocyanate added is excessive, the core cannot be sufficiently radiated, and the desired fragrance performance cannot be achieved. On the other hand, if the amount added is insufficient, the formation of the microcapsules becomes insufficient and the stability over time of the microcapsules is greatly impaired. The appropriate amount of polyisocyanate added varies depending on the type and combination of polyisocyanates. The polyisocyanate used in the present invention is preferably toluene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate, more preferably a biuret of hexamethylene diisocyanate, toluene diisocyanate, or a combination thereof, and most preferably a biuret of hexamethylene diisocyanate. The amount of polyisocyanate added is optimal depending on the type and combination thereof, but is generally preferably 0.01% to 15% of the total mass of the microcapsule, more preferably 0.1% to 10%, and even more preferably 0.5 to 5%.

[0014] In the present invention, glucomannan is used as a reinforcing material for the microcapsule shell. The glucomannan is a plant-derived component, but it has the effect of reinforcing the shell of the microcapsule of the present invention and preventing the leakage of the core fragrance composition. Furthermore, it has been found that when the microcapsule of the present invention is used in a consumer product, it has the effect of improving the fragrance performance of the microcapsule. The glucomannan is purified from konjac root and has several molecular weights, including those that have been reduced in molecular weight without structural change, and the higher the molecular weight, the higher the viscosity of the aqueous solution becomes, and the less the amount of addition can be. The viscosity of the aqueous solution can also be adjusted by combining glucomannans with different molecular weights. The amount of glucomannan added varies depending on the molecular weight and combination, but is generally preferably 0.01% to 3% of the total mass of the microcapsule, more preferably 0.03% to 2%, and even more preferably 0.05% to 1%.

[0015] The production of microcapsules by the simple coacervation method is carried out as follows: (a) dissolving the components (1) and (3) in water; (b) mixing component (2) with a fragrance composition; (c) adding the mixture obtained in (b) to the aqueous solution obtained in (a) to emulsify or disperse the mixture to form an emulsion; (d) adding dextrins and / or polyvinyl alcohol to the emulsion; (e) adding polyphenols to the emulsion; (f) forming a shell by heating the emulsion. As the coacervate inducer, dextrins and / or polyvinyl alcohol can be used as described above. In particular, it is preferable to use dextrins derived from plants and which are environmentally friendly. When using dextrins, dextrins with a dextrose equivalent selected according to the particle size and shape of the microcapsules to be produced are used. Here, dextrins refer to all dextrins classified according to dextrose equivalent. Generally, those with a dextrose equivalent of 10 or less are called dextrins, those with a dextrose equivalent in the range of 10 to 20 are called maltodextrins, and those with a dextrose equivalent of 20 or more are called powdered candy. Here, dextrins are collectively referred to as such. The preferred dextrose equivalent of the present invention is 2 to 30, more preferably 5 to 25, and multiple dextrins can be used in combination. In order to harden the coacervate, polyphenols are added and heated as described above. The polyphenols are known and are not particularly limited, and may be used in combination. In the present invention, the capsule membrane can be efficiently hardened by using a plant extract containing a large amount of catechins and tannic acid in combination. Preferred are tea extract, sugar cane extract, wine polyphenol, apple polyphenol, and tannic acid, and most preferred is a combination of tea extract and tannic acid. After adding the polyphenols, the emulsion is heated to harden the shell. The hardening of the capsule shell is carried out in two stages: hardening with the polyphenols and reinforcement with the polyisocyanate. The heating temperature suitable for hardening with the polyphenols depends on the thermal gelation temperature of the cellulose derivative. In the present invention, the heating temperature is preferably 40°C or higher, more preferably 50 to 80°C, and even more preferably 60 to 70°C. The heating temperature suitable for reinforcement with the polyisocyanate depends on the type of polyisocyanate used. In the present invention, the heating temperature is preferably 50 to 80°C, and most preferably 60 to 75°C.

[0016] The microcapsules obtained by the above method are obtained in a form dispersed in water. The microcapsules can be used as they are as an aqueous composition (hereinafter, sometimes referred to as a microcapsule slurry). Alternatively, depending on the application, the water can be removed by a process such as a spray dryer or freeze drying, and the resulting microcapsules can be used as powdered microcapsules. The amount of microcapsules in the microcapsule slurry is preferably 20% or more, more preferably 30% or more of the slurry.

[0017] Consumer products in which the microcapsules of the present invention can be used include home care products such as laundry detergents, personal care products such as cosmetics, fragrances, quasi-drugs, pharmaceuticals, etc. Their formulations and ingredients are well known to those skilled in the art. Examples of these products include, but are not limited to, the following. Examples of personal care products such as cosmetics include cosmetics, products for removing cosmetics, shaving agents, hair care products, skin cleansers such as shampoos, hair conditioners, body washes or soaps, leave-in skin care products, moistened body paper, body sprays, deodorants and antiperspirants, cooling products such as sheets or sprays, sunbathing products, products for tanning, etc. Examples of cosmetics include skin powders, creams, emulsions, lotions, gels and oils. Examples of shaving agents include cream or mousse shaving agents, shaving aids or depilatories, etc. Examples of hair care products include liquid and paste hair dyes and bleaches, permanent wave agents, curl removers, hair styling agents, hair tonics, etc. Skin cleansers such as shampoos, hair conditioners, body washes or soaps may be liquid, solid, gel or foam, may be used for beauty and hygiene purposes, and may be rinsed off or not rinsed off. Leave-on skin care products include hand lotions, body lotions, makeup removers, skin creams, sun protection products, sunless tanning products, etc. Moistened tissues include skin cleansing fabrics, baby wipes, makeup removal fabrics, and lotion fabrics. Body sprays, deodorants, and antiperspirants include sticks, liquid roll-on adapters, and pressurized sprays. Specific examples of home care products such as laundry detergents for clothing include detergents for cleaning floors, walls, tiles, mirrors, glass and other hard surfaces, detergents for washing dishes by hand or machine, mists and sprays for indoor decorations, furniture, fabrics, etc., other deodorants, air fresheners, tissue paper, toilet paper, liquid laundry detergents, concentrated liquid detergents, powder detergents, laundry tablets, bar-shaped laundry detergents, tumble dryer sheets, ironing water, laundry softeners, finishing agents, pre-wash and post-wash treatment agents, laundry fragrances, etc. Regardless of the purpose, the home care products may be in the form of creams, foams, liquids, sprays, or may be pre-moistened surface cleaning fabrics. Specific examples of the air freshener include candles, sticks, sprays, and heating types, and may be used in combination with useful ingredients such as deodorants and mosquito repellents. EXAMPLES

[0018] The present invention will be specifically described below with reference to examples and comparative examples, but the present invention is not limited thereto. Unless otherwise specified, "%" is based on mass. <Fragrance composition A> Fragrance composition A was prepared using the following ingredients and proportions.

[0019] [Table 2]

[0020] <Fragrance composition B> Fragrance composition B was prepared using the following ingredients and proportions.

[0021] [Table 3]

[0022] Example 1 Hydroxypropylmethylcellulose (Metolose 60SH50: manufactured by Shin-Etsu Chemical Co., Ltd.), which is a cellulose derivative, was dissolved in ion-exchanged water to prepare 93.6 g of a 3% aqueous solution as component (1). 1.5 g of a biuret of hexamethylene diisocyanate (Desmodur N3200A: manufactured by Sumika Covestro Urethane Co., Ltd.: hereinafter referred to as HDI) was added to 45 ml of the fragrance composition A as component (2), and the mixture was stirred for 10 minutes to dissolve. Glucomannan (Reolex RS: manufactured by Shimizu Chemical Co., Ltd.) was dissolved in ion-exchanged water as component (3), to prepare 13.0 g of a 1% aqueous solution. 15.1 g of ion-exchanged water was further added to the mixed solution, and the mixture was dispersed in a homomixer to obtain an emulsion of droplets with a particle size of 20 μm to prepare an oil-in-water (O / W) emulsion. After slowly adding 8.4g of dextrin (Sandek #180: Sanwa Starch Industry Co., Ltd.) to the emulsion, it was heated to 60°C and stirred for 20 minutes. 6.2g of 14% aqueous solution of tea extract (Sunphenon 90S: Taiyo Kagaku Co., Ltd.) was slowly added dropwise, followed by 12.5g of 5% aqueous solution of tannic acid (Hi tannic acid: Sumitomo Pharma Food & Chemical Co., Ltd.) to harden the wall membrane. The temperature was raised to 70°C and stirred for 75 minutes to react with HDI. Heating was stopped and stirring was continued overnight to obtain a microcapsule slurry.

[0023] (Examples 2 to 6) A microcapsule slurry was obtained in the same manner as in Example 1, except that the components (1), (2), and (3) in Example 1 were changed as shown in Table 4.

[0024] (Examples 7 to 8) A microcapsule slurry was obtained in the same manner as in Example 1, except that the fragrance composition in Example 1 was changed to B and the components (1), (2), and (3) were changed as shown in Table 5.

[0025] (Comparative Examples 1 to 3) A microcapsule slurry was obtained in the same manner as in Example 1, except that the components (1), (2), and (3) in Example 1 were changed as shown in Table 5.

[0026] [Table 4]

[0027] [Table 5]

[0028] Example 9 The microcapsules obtained in Examples 1 to 8 and Comparative Examples 1 to 3 were evaluated by the following method. <Softener Composition> A fabric softener composition was made with the following ingredients and proportions:

[0029] [Table 6]

[0030] <Evaluation of fragrance intensity> The obtained microcapsule slurry was added to the softener composition and thoroughly mixed. The amount of the microcapsule slurry added was adjusted so that the concentration of the encapsulated fragrance composition in the softener composition was 0.1%. Cotton towels were washed using the obtained softener composition and dried overnight. The dried towels were lightly rubbed to rupture the microcapsules, and the odor intensity was evaluated on a 6-point scale from 0 to 5 by a panel of 10 experts. The average evaluation results are shown in Table 7. The odor intensity index is as follows: 5: Very strong 4: Strong 3: Somewhat strong 2: Somewhat weak 1: Weak 0: Odorless

[0031] [Table 7]

[0032] From Table 7, it can be seen that all of Examples 1 to 6 had a fragrance intensity of 2.5 or more, which is clearly superior to the Comparative Examples. In particular, Example 1 showed a very strong fragrance intensity of 3.8. Examples 7 and 8, which used different fragrance compositions, also showed a similarly strong fragrance intensity.

[0033] Example 10 <Storage test in fabric softener base for 1 month at 40℃> The long-term storage stability of the microcapsules prepared in the above Examples 1 to 8 and Comparative Examples 1 to 3 in a fabric softener composition was examined. The microcapsules obtained in each Example and Comparative Example were added to the fabric softener composition and thoroughly mixed. The amount of microcapsules added was adjusted so that the concentration of the encapsulated fragrance composition in the fabric softener composition was 0.1%. The fabric softener composition obtained was stored in a thermostatic chamber at 40°C and removed after 4 weeks. The fragrance intensity was evaluated using this fabric softener composition and compared with that before the long-term storage test. The change in fragrance intensity due to the long-term storage test is shown in Table 8. The symbols in the table are as follows: ◎: Almost no decrease in fragrance intensity was observed and it was stable. 〇: There is a slight decrease in fragrance intensity, but the fragrance is still strong enough. △: A clear decrease in fragrance intensity is observed, and the fragrance intensity is insufficient. ×: Fragrance intensity significantly decreased or almost no fragrance was detected

[0034] [Table 8]

[0035] In all of Examples 1 to 6, the deterioration in fragrance intensity was hardly observed or was sufficiently small after long-term storage in the fabric softener composition. On the other hand, in all of Comparative Examples 1 to 3, the deterioration in fragrance intensity was significant, making them unsuitable for use in fabric softener consumer products. In Examples 7 to 8, in which the fragrance composition was changed, the deterioration in fragrance intensity was also sufficiently small.

[0036] Example 11 <Skin cream composition> A skin cream as shown in Table 9 was prepared according to a conventional method. 0.044 g of the microcapsule slurry prepared in Example 1 was added to 100 g of this skin cream and mixed thoroughly. The prepared skin cream was applied to the skin, and when the applied area was rubbed after drying, a strong odor of the fragrance encapsulated in the microcapsules was confirmed.

[0037] [Table 9]

[0038] Example 12 <Skin lotion composition> A skin lotion as shown in Table 10 was prepared according to a conventional method. 0.044 g of the microcapsule slurry prepared in Example 4 was added to 100 g of this skin lotion and mixed thoroughly to prepare a skin lotion containing fragrance microcapsules.

[0039] [Table 10]

[0040] Example 13 <Shampoo Composition> The shampoo shown in Table 11 was prepared in a conventional manner. 0.87 g of the microcapsule slurry prepared in Example 6 was added to 100 g of this shampoo and mixed thoroughly to prepare a shampoo containing perfume microcapsules.

[0041] [Table 11]

[0042] Example 14 <Hair conditioner composition> A hair conditioner as shown in Table 12 was prepared in a conventional manner. 0.87 g of the microcapsule slurry prepared in Example 7 was added to 100 g of this hair conditioner and mixed thoroughly. The prepared hair conditioner was applied evenly to wet hair after washing in a conventional manner, rinsed off with water, and the hair was rubbed after drying. The release of the fragrance encapsulated in the microcapsules was confirmed.

[0043] [Table 12]

[0044] Example 15 <Body soap composition> The body soap shown in Table 13 was prepared in a conventional manner. 0.87 g of the microcapsule slurry prepared in Example 1 was added to 100 g of this body soap and mixed thoroughly to prepare a body soap containing fragrance microcapsules.

[0045] [Table 13]

Claims

1. A core-shell type microcapsule comprising a core and a shell, The aforementioned shell, Ingredient (1): Cellulose derivative Component (2): At least one polyisocyanate having at least two isocyanate groups Ingredient (3): Glucomannan A monomer mixture containing the above is included in a polymerized form, A microcapsule containing a fragrance composition as the core.

2. The microcapsule according to claim 1, wherein the component (1) is selected from the group consisting of methylcellulose, carboxymethylcellulose, hydroxypropylcellulose, hydroxypropylmethylcellulose, hydroxyethylcellulose, hydroxyethylmethylcellulose, and mixtures thereof, and is contained in an amount of 0.1% to 30% by mass of the total mass of the microcapsule.

3. The microcapsule according to claim 1, wherein the component (2) is selected from the group consisting of hexamethylene diisocyanate, toluene diisocyanate, isophorone diisocyanate, pentamethylene diisocyanate, xylene diisocyanate, or their isocyanurates, biuretes, trimethylolpropane adducts, and combinations thereof, and is contained in an amount of 0.01% to 15% by mass of the total mass of the microcapsule.

4. The microcapsule according to claim 1, wherein the component (3) is contained in an amount of 0.01% to 5% by mass of the mass of the microcapsule.

5. The microcapsule according to claim 1, characterized by containing dextrins and / or polyvinyl alcohols.

6. The microcapsule according to claim 1, characterized by containing polyphenols.

7. A method for producing microcapsules according to any one of claims 1 to 6, comprising the steps a to f below: (a) A step of dissolving component (1) and component (3) in water, (b) A step of mixing component (2) with the fragrance composition, (c) Add the mixture obtained in (b) to the aqueous solution obtained in (a), emulsify or disperse to form an emulsion. (d) A step of adding dextrins to the emulsion, (e) A step of adding polyphenols to the emulsion, (f) A step in which the emulsion is heated to form a shell.

8. The manufacturing method according to claim 7, characterized in that the dextrose equivalent of the dextrins added in step (d) is in the range of 2 to 30.

9. The manufacturing method according to claim 7, characterized in that, in step (e), the polyphenols to be added are selected from the group consisting of tea extract, tannic acid, and combinations thereof.

10. An aqueous composition containing microcapsules according to any one of claims 1 to 6.

11. A consumer product characterized by comprising microcapsules and / or a microcapsule-containing aqueous composition according to any one of claims 1 to 6.