Water-soluble cleaning sheet comprising biodegradable aroma capsules

Abstract

This invention relates to a detergent sheet comprising biodegradable aroma capsules. The detergent sheet includes a water-soluble film-forming agent, a surfactant mixed with the water-soluble film-forming agent, and biodegradable aroma capsules. The detergent sheet contains a pH adjuster, and the pH of the solution in which the detergent sheet is dissolved is 6 or lower. The detergent sheet of this invention exhibits excellent performance, and the biodegradable aroma capsules demonstrate excellent stability.

Description

Technical Field

[0001] This invention relates to a water-soluble sheet detergent, and more specifically, to a water-soluble sheet detergent that stably contains biodegradable fragrance capsules. Background Technology

[0002] While soluble sheet detergents are suitable for washing, their high-temperature drying process leads to fragrance loss, and they require a smaller quantity compared to other detergents, resulting in insufficient fragrance retention on clothing after washing. To address this issue, and given the increasing consumer demand for fragrance, a method of incorporating encapsulated fragrances into sheets has been developed.

[0003] However, most of these capsules are not biodegradable, resulting in microplastic residue. To address this issue, capsules using proteins such as gelatin or polysaccharides such as starch have been developed. However, when used in soluble sheet-type detergents, these capsules exhibit reduced stability and effectiveness compared to existing capsules.

[0004] This is due to the capsules being damaged in the soluble tablet formulation, and the aroma being lost from the damaged capsules during the drying process. Furthermore, there is also the issue of continued aroma loss from the capsules during room temperature storage of the soluble tablets.

[0005] Therefore, a suitable scheme was developed to improve the stability of aroma capsules during the manufacturing and storage of the sheet material. Summary of the Invention

[0006] The problem to be solved

[0007] Therefore, the problem to be solved by the present invention is to provide a washing sheet that improves the stability of fragrance capsules. Furthermore, another problem is to provide a water-soluble washing sheet that enhances fragrance retention.

[0008] Solution to the problem

[0009] To address the aforementioned issues, this invention provides a water-soluble detergent sheet in which aroma capsules are stably formulated, resulting in excellent fragrance retention.

[0010] As used in this specification, "soluble in water" means partially or completely dissolved in water. Furthermore, "water-soluble" can be understood similarly and is generally a term used in the industry. In this case, there are no major limitations on the dissolution temperature; it typically refers to the temperature conditions during the washing process of a washing machine, preferably complete dissolution at room temperature.

[0011] One embodiment of the present invention provides a water-soluble detergent sheet comprising a water-soluble film-forming agent, a surfactant mixed with the water-soluble film-forming agent, and a biodegradable fragrance capsule, wherein the detergent sheet is acidic after dissolution. The detergent sheet may further comprise a pH adjuster.

[0012] The term "acidity" as used in this invention can refer to a solution with a pH of 6 or lower obtained by dissolving 0.2 to 0.8 g of washing sheet in 1 liter of water at 25°C. Preferably, the pH under the above conditions can be 2 to 5, more preferably 2.5 to 4, and even more preferably 2.8 to 3.5.

[0013] The term "washing sheet" as used in this specification can refer to a solution prepared by combining a water-soluble film-forming agent with a surfactant as a component of a washing detergent, but is not limited to that manufacturing method. Here, the aroma capsules of the present invention can be prepared together with the above-described formulation and then partially or completely dried.

[0014] The aforementioned washing sheets may contain part or all of the aforementioned surfactants between the polymer chains, and all or part of the aforementioned fragrance capsules may also be contained between the polymer chains. The polymers constituting the aforementioned polymer chains may contain the aforementioned water-soluble film-forming agents.

[0015] The washing sheet of the present invention can be formed by completely drying the solution containing the aroma capsules, or by drying a portion of the solution to obtain a semi-dry film. The term "semi-dry" refers to a state in which the film contains a certain amount of moisture while maintaining its membrane shape. For example, it can refer to a state in which 70% or more, preferably 80% or more, and more preferably 90% or more of the moisture used in manufacturing the washing sheet has evaporated.

[0016] As an example, the aforementioned washing sheet is acidic with a pH of 6 or lower. Specifically, the pH of a solution obtained by dissolving 0.2 to 0.8 g, 0.3 to 0.6 g, or 0.3 to 0.4 g of the washing sheet in 1 liter of water at 25°C can be 6 or lower. Preferably, the pH can be 6 or lower, 5.5 or lower, 5 or lower, 4.5 or lower, 4 or lower, 3.5 or lower, 3 or lower, 2.5 or lower. Preferably, the pH of the aforementioned washing sheet after dissolving in water can be 2.5 to 4, and more preferably, the pH can be 2.8 to 3.5.

[0017] Conventional detergent sheets sold in the industry are typically alkaline, while the detergent sheets of this invention are acidic. This characteristic minimizes the deformation of the aroma capsules and improves aroma persistence. The inventors of this invention have discovered that the detergent sheets under the aforementioned acidic conditions exhibit excellent stability of biodegradable aroma capsules, preventing damage to the aroma capsules during drying and thus reducing aroma loss.

[0018] The pH adjuster described above can use organic acids and their salts. Preferably, it may contain one or more acids and their salts selected from the group consisting of i) citric acid and its salts, ii) acetic acid and its salts, iii) lactic acid and its salts, iv) malic acid and its salts, and v) malonic acid and its salts. Here, the salts include one or more inorganic salts and organic salts. The inorganic salts include one or more selected from the group consisting of sodium salts, potassium salts, calcium salts, magnesium salts, aluminum salts, and zinc salts. The organic salts include one or more selected from the group consisting of organic amine salts and basic amino acid salts. The organic amine salts include one or more selected from the group consisting of ammonium salts, monoethanolamine salts, diethanolamine salts, and triethanolamine salts. The basic amino acid salts include one or more selected from the group consisting of arginine salts and lysine salts, but are not limited thereto. Preferably, the pH adjuster may contain citric acid and its salts, more preferably citric acid and sodium citrate. Citric acid and sodium citrate are preferred in terms of dosage form of sheets, stability of biodegradable capsules, and aroma diffusion power.

[0019] In one embodiment of the present invention, the content of the pH adjuster may be 8 to 25% by weight, based on the total dry weight of the washing sheet. Preferably, the content may be 10 to 23% by weight, more preferably, the content may be 11 to 20% by weight. When the above content range is present, it is suitable for the dosage form of the sheet, the stability of the capsule, the aroma dispersibility, and other objectives of the present invention.

[0020] In one embodiment of the invention, the aforementioned organic acid and its salt, used as a pH adjuster, may be contained in a weight ratio of 3:9 to 10:7. When the above ratio is achieved, the composition may have a preferred pH, and the dosage form of the sheet may be excellent.

[0021] The aforementioned biodegradable aroma capsule comprises a biodegradable membrane. Preferably, the aroma component is encapsulated by the biodegradable membrane, which may be formed of proteins and / or polysaccharides. Preferably, the biodegradability of the aforementioned biodegradable aroma capsule, according to the OECD 301F test method, is 60% or more within 60 days. Here, "biodegradable" refers to materials that can be decomposed into water and carbon dioxide (or water and methane gas) by microorganisms such as bacteria, algae, and molds found in nature. Typically, this may include proteins and / or polysaccharides. Proteins may include animal proteins, gelatin, plant proteins, etc., without limitation. Polysaccharides may include starch, and may include linear, branched, modified polysaccharides, etc., without limitation. In one implementation, the aforementioned biodegradable membrane may be a single-layer membrane or a multi-layer membrane, and the multi-layer membrane may have a core-shell structure. There are many methods for measuring biodegradability, but the inventors of this invention evaluate biodegradability based on the degree of biodegradability measured using the OECD 301F test method. When the degree of biodegradability according to the above test method is 60% or more within 60 days, it is evaluated as biodegradable.

[0022] The aforementioned biodegradable aroma capsules may be contained in a “perceptible sufficient amount,” which can be understood as 0.1 to 10% by weight, specifically 0.5 to 8% by weight, and more specifically 0.8 to 7% by weight, relative to the total weight of the sheet. The washing sheet of the present invention can stably contain an excess of biodegradable aroma capsules.

[0023] The fragrance contained in the biodegradable aroma capsules of the present invention may be any fragrance that can be contained in detergents, provided that it does not impair the purpose of the invention. The fragrance loaded in the biodegradable aroma capsules may be selected appropriately for compatibility with the biodegradable membrane. For example, compounds of the ester, ether, aldehyde, ketone, alcohol, and hydrocarbon types, or natural compounds of plant origin may be used.

[0024] The washing sheet of the present invention is formed by mixing a water-soluble film-forming agent and a surfactant. The polymer matrix formed by dissolving the water-soluble film-forming agent in water may contain the surfactant. Water-soluble film-forming agents include various polymers such as gelatin, pectin, dextran, hyaluronic acid, collagen, agar, gum arabic, acacia gum, alginate, sodium alginate, methylcellulose, ethylcellulose, hydroxyethylcellulose, sodium carboxymethylcellulose, starch, dextrin, carboxymethyl starch, polyvinylpyrrolidone, polyvinyl methacrylate, polyacrylic acid, and polyethylene oxide. Polyvinyl alcohol or polyvinyl alcohol copolymers are preferably used as water-soluble film-forming agents. In particular, polyvinyl alcohol or polyvinyl alcohol copolymers can maintain the tensile strength and other physical properties of the film without hindering the stability of the biodegradable aroma capsules. In the washing sheet of the present invention, in particular, among polyvinyl alcohol or polyvinyl alcohol copolymers having various molecular weights and degrees of saponification, when taking into account factors such as film formulation properties, solubility, storage stability, and compatibility with aroma capsules, polymers with a number average molecular weight of 10,000 to 100,000 are preferred, more preferably, the number average molecular weight can be 20,000 to 50,000, and even more preferably, it can be 20,000 to 30,000.

[0025] Furthermore, the degree of saponification of polyvinyl alcohol or polyvinyl alcohol copolymers is preferably 70-95%, more preferably 75-93%, and even more preferably 80-90%.

[0026] The total content of the water-soluble film-forming agent in the sheet after drying may be 20 to 50% by weight, preferably 22 to 40% by weight, and more preferably 23 to 35% by weight, relative to the total weight of the sheet after drying. The total content of the surfactant formulated with the water-soluble film-forming agent may be 40 to 60% by weight, relative to the total weight of the sheet after drying.

[0027] The surfactant described above may comprise, preferably, an alkyl sulfate salt having 8 to 18 carbon atoms, more preferably a dodecyl sulfate salt. Among the alkyl sulfate salts including the dodecyl sulfate salt, the salt is an alkali metal salt, preferably a sodium or potassium salt, and most preferably a sodium salt. Preferably, the surfactant may comprise sodium dodecyl sulfate.

[0028] In another embodiment, to improve washing performance, the sheet material may further include an ethoxylated alcohol surfactant as a surfactant. The ethoxylated alcohol surfactant may be included as an auxiliary surfactant.

[0029] In one embodiment of the present invention, the alkyl sulfate salt having 8 to 18 carbon atoms can be included as the main surfactant, and based on the total weight of the surfactant, the content of the main surfactant in the sheet can be 50% by weight or more, more preferably 60% by weight or more, and more preferably 70% by weight or more. The auxiliary surfactant is preferably a nonionic surfactant, and more preferably, it can include an ethoxylated alcohol surfactant. For example, it can include LA7 or LA9. Most preferably, LA7 (Lauryl Alcohol Ethoxylates 7 MOLE) can be included as the auxiliary surfactant.

[0030] In one embodiment of the present invention, the content of the auxiliary surfactant may be 3 to 15% by weight, preferably 5 to 12% by weight, relative to the total dry weight of the washing sheet.

[0031] To improve washing performance or film-forming ability without compromising the film-forming properties, storage stability, ease of manufacture, stability of fragrance capsules, and fragrance longevity of the sheet, the washing sheet of the present invention may further contain: fluorescent whitening agents; enzymes (e.g., cellulase, protease, etc.); disintegrants / disintegrant aids (e.g., starch, cellulose derivatives, sodium chloride, citric acid, glycerol, propylene glycol); fiber softeners (e.g., quaternary ammonium salt cationic surfactants, silicone fiber softening ingredients); bleaching agents (e.g., perborate, percarbonate, superphosphate, diacyl, tetraacyl peroxide); dispersants / emulsifiers (e.g., polyoxyalkylene alkylphenyl ethers, polyoxyalkylene alkyl ethers, polyoxyethylene polyoxypropylene block polymers); bactericides / disinfectants (e.g., sodium hypochlorite, hydrogen peroxide, urea peroxide); fragrances; preservatives; pigments; antibacterial agents, etc.

[0032] In one embodiment of the invention, the aforementioned washing sheet is characterized by being substantially free of alkaline detergent builders. When alkaline detergent builders are included, the pH increases, the stability of the fragrance capsules decreases, and the alkaline detergent builders contained in the compositions of the present invention may be neutralized, making it difficult to achieve their original performance.

[0033] The term "substantially not containing" as used in this invention can mean that the content of the contained ingredient is insufficient to produce the effect generally expected in the industry. The term can mean that the content of the ingredient is less than 5% by weight relative to the total dry weight of the sheet, preferably less than 3% by weight, more preferably less than 1% by weight, even more preferably less than 0.5% by weight, and most preferably not contained.

[0034] The thickness of the detergent sheet of the present invention is preferably 1 μm to 1 cm, more preferably 5 μm to 0.5 cm, and most preferably 50 μm to 1 mm. Within the above range, the stability of the aroma capsules contained in the dried detergent sheet can be easily maintained.

[0035] As an example, the washing sheet of the present invention may further include a bubbling process. The bubbling process improves the stability of the aroma capsules dispersed in the sheet.

[0036] According to one implementation example, the aforementioned washing sheet may further contain a plasticizer. By further containing a plasticizer, the flexibility of the sheet is improved, thereby making it less prone to breakage. The plasticizer may be any one or more selected from the group consisting of sorbitol, mannitol, glycerol, glycol, pentaerythritol, and polyols, but is not limited thereto. The content of the plasticizer relative to the total weight of the washing sheet may be 2 to 8% by weight, preferably 3 to 6% by weight.

[0037] In one embodiment of the present invention, the washing sheet may include tear lines.

[0038] In one embodiment of the present invention, the washing sheet can be used in two or more layers. It can have the following forms: layers of identical washing sheets, or layers of washing sheets with different compositions, physical properties, colors, etc., or containing an active substance between the washing sheets. The active substance can be fragrance, cleaning agent, bleach, etc., as long as it can be manufactured into granular or solid forms commonly used in the industry.

[0039] Invention Effects

[0040] This invention provides a soluble detergent sheet with excellent aroma retention. This invention improves the problem of aroma loss during storage by stably maintaining biodegradable aroma capsules. Attached Figure Description

[0041] The following figures accompanying this specification illustrate preferred embodiments of the invention and, together with the foregoing description of the invention, serve to further illustrate the technical concept of the invention. Therefore, the invention should not be interpreted as limited to the matters described in these figures.

[0042] Figure 1 These are the fragrance panel test results for Example 1 and Comparative Example 1. The results for Example 1 are excellent, while those for Comparative Example 1 are less satisfactory.

[0043] Figure 2 These are microscope photographs of the time-dependent stability evaluation based on Example 1 and Comparative Example 1. Detailed Implementation

[0044] The present invention will now be described in detail with reference to embodiments, etc., to aid in understanding. However, the embodiments of the present invention can be modified in various different forms, and the scope of the present invention should not be construed as limited to the following embodiments. The embodiments of the present invention are provided to provide a more complete explanation of the present invention to those skilled in the art. In this specification, % is understood to mean weight percentage, unless otherwise specified.

[0045] Manufacturing Example 1. Manufacturing of detergent sheets containing fragrance capsules

[0046] (1) Manufacturing method

[0047] Dissolve the components listed in Tables 1 and 2 below in water at 60°C according to the weight ratios described below to produce a final solution with a water content of 48% by weight. Units are expressed as % by weight.

[0048] [Table 1]

[0049]

[0050] [Table 2]

[0051]

[0052] Polyvinyl alcohol, plasticizer, surfactants (SLS and LA), pH adjuster (soda ash or sodium citrate / citric acid), and aroma capsules were sequentially added to water and mixed. The mixture was then applied to release paper to a thickness of 1.5 mm using a comma-shaped scraper. The mixture was dried in a 125°C oven for 7 minutes and 30 seconds, and then separated from the release paper to obtain a sheet.

[0053] Purchase Givaudan's Protein Flavor Capsules here on PlanetCaps. TM For product use. Non-protein aroma capsules use DaeHa ManTech's MS51-308P01490 CAP.

[0054] (2) Evaluation

[0055] A. Method for evaluating the long-term stability of fragrance components in detergent sheets

[0056] 1) After adding aroma capsules to 100g of soluble sheet preparation solution (dissolved in water so that the total raw material content in the solution accounts for 50%), the solution is dried at high temperature (125°C, 7 minutes and 30 seconds) to manufacture sheets using the comparative example / example.

[0057] 2) Dissolve a portion of the prepared sheet in water at a concentration of 1g / 50ml, then observe it using an optical microscope (OLYMPUSBX53M) at 10X magnification and take photographs for record-keeping. (RT, 40%)

[0058] 3) The remaining sheets are stored in a 50°C chamber.

[0059] 4) Take the sheet out of the room every week and go through the process in 2).

[0060] 5) The stability was evaluated based on the morphological changes of the aroma capsules over time.

[0061] The evaluation criteria are as follows.

[0062] X: After one week of storage, the altered aroma capsules (with the fragrance exhausted and in a crescent shape) retain more than 50% of the aroma compared to the unaltered aroma capsules.

[0063] △: After four weeks of storage, the denatured aroma capsules retain more than 50% of the aroma compared to the undenatured aroma capsules.

[0064] O: After four weeks of storage, the denatured aroma capsules retain 20% to less than 50% of the aroma compared to the undenatured aroma capsules.

[0065] ◎: After four weeks of storage, the denatured aroma capsules showed less than 20% of the same properties as the undenatured aroma capsules.

[0066] B. Biodegradability Measurement Method

[0067] Perform the OECD 301F test [>60% degraded in 60 days] and evaluate according to the following benchmarks.

[0068] X: After 60 days, the degradation rate did not exceed 60%.

[0069] O: After 60 days, the degradation rate exceeds 60%.

[0070] Experiment Example 1. Group Test of Fragrance Dispersion Ability

[0071] (1) Method

[0072] 1) Wash two towels (Matsugetsu towels, top grade 30 count) once in an LG front-loading washing machine (model: F21VDD) using the following detergent in a standard program (wash: standard, rinse: twice, spin: strong, water temperature: 40℃).

[0073] Experiment A. Evaluation was conducted after washing with a soluble sheet detergent (Comparative Example 1, 6 g) that did not contain fragrance capsules.

[0074] Experiment B. Evaluation was conducted after washing with a soluble sheet detergent containing aroma capsules (4 g each from Example 1 and Comparative Example 1).

[0075] Experiment C. Each of Example 1 (excluding the aroma capsules) and Comparative Example 1 was simultaneously immersed in 1% by weight (0.04 g) of aroma capsules, washed, and then evaluated.

[0076] 2) After drying on an indoor drying rack for 12 hours (RT, 40%) and rubbing the dried towels (folding the towels together and rubbing them three times), a team of 10 professionals conducted group tests according to the conditions in Table 3, and the results are presented below. Figure 1 .

[0077] [Table 3]

[0078]

[0079] (2) Results

[0080] The results of Comparative Example 1 showed that, despite the addition of fragrance, no strong aroma was perceived, while the results of Example 1 showed that a strong aroma, similar in intensity to that when fragrance was added alone, was perceived. Figure 1 The results confirmed that the fragrance dispersing ability of acidic detergent sheets containing fragrance capsules did not change significantly even after heating. Therefore, detergent sheets capable of stable fragrance dispersing can be provided.

Claims

1. A detergent sheet comprising a water-soluble film-forming agent, a surfactant mixed with the water-soluble film-forming agent, and a biodegradable fragrance capsule, characterized in that, The washing sheet contains a pH adjuster. The pH of the solution containing the washing sheet is below 6.

2. The washing sheet according to claim 1, characterized in that, The pH of the solution containing the washing sheet is between 2 and 5.

3. The washing sheet according to claim 1, wherein, The pH adjuster comprises any one or more organic acids and their salts selected from the group consisting of citric acid and its salts, acetic acid and its salts, lactic acid and its salts, malic acid and its salts, and malonic acid and its salts.

4. The washing sheet according to claim 3, wherein, The pH adjuster is citric acid and sodium citrate.

5. The washing sheet according to claim 1, characterized in that, The biodegradable aroma capsule comprises a biodegradable membrane formed of proteins and / or polysaccharides.

6. The washing sheet according to claim 1, wherein, The water-soluble film-forming agent comprises any one or more selected from the group consisting of polyvinyl alcohol, polyvinyl alcohol copolymers, gelatin, pectin, dextran, hyaluronic acid, collagen, agar, gum arabic, farnesian gum, alginate, sodium alginate, methylcellulose, ethylcellulose, hydroxyethylcellulose, carboxymethylcellulose, sodium carboxymethylcellulose, starch, dextrin, carboxymethyl starch, polyvinylpyrrolidone, polyvinyl methacrylate, polyacrylic acid, and polyethylene oxide.

7. The washing sheet according to claim 1, characterized in that, The water-soluble film-forming agent comprises polyvinyl alcohol, wherein the number average molecular weight of the polyvinyl alcohol is 20,000 to 50,000.

8. The washing sheet according to claim 1, characterized in that, The washing sheet does not actually contain alkaline detergent additives.

9. The washing sheet according to claim 1, wherein, The total content of water-soluble film-forming agent in the sheet is 20 to 50% by weight relative to the total weight of the dried sheet.

10. The washing sheet according to claim 1, wherein, The total content of surfactant in the sheet is 40 to 60% by weight relative to the total weight of the dried sheet.

11. The washing sheet according to claim 1, wherein, The surfactant comprises an alkali metal salt of an alkyl sulfate having 8 to 18 carbon atoms.

12. The washing sheet according to claim 11, wherein, The surfactant contains sodium dodecyl sulfate.

13. The washing sheet according to claim 1, wherein, The washing sheet has a biodegradability of more than 60% within 60 days according to the OECD 301F test method.

14. The washing sheet according to claim 3, wherein, The organic acids and their salts are contained in a weight ratio of 3:9 to 10:7.

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