Sheet material and method for producing sheet material

Abstract

To provide a sheet material and a sheet material production method that do not produce an acetic acid odor irrespective of the material of a substrate, can be produced inexpensively, and are suitably applicable for cosmetic purposes.SOLUTION: This method includes: a preparation step for preparing a polymer solution KYE containing 8 mass% or less of chitosan, 2 mass% or more of polyvinyl alcohol, and citric acid in a mass% equal to or more than the mass% of chitosan and equal to or less than 8 mass%; a spinning step for forming, by a dry spinning method, an organic fiber layer 12 on one surface of a substrate layer 11 from the polymer solution KYE; a crosslinking selection step for selecting whether or not to crosslink the polyvinyl alcohol by heating the organic fiber layer 12 formed in the spinning step; and a heating step that is carried out only when crosslinking of the polyvinyl alcohol is selected in the crosslinking selection step, the heating step configured to heat the organic fiber layer 12 formed in the spinning step at 145°C to 170°C.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a sheet-like material manufactured by a dry spinning method and suitably applicable to beauty applications, and a method for manufacturing the sheet-like material.

Background Art

[0002] Chitosan is known to be excellent in antibacterial properties and biocompatibility, and fiber sheets made of chitosan are expected to be applied in various fields.

[0003] Based on the above-mentioned properties of chitosan, the applicant of this application also believes that excellent beauty (cosmetic) products can be provided by using a fiber sheet made of chitosan, and has been researching and developing the application of chitosan in the beauty field on a daily basis. In the past, an invention related to a sheet-like material using chitosan (see Patent Document 1) was made and a patent was obtained.

[0004] The sheet-like material disclosed in this Patent Document 1 (hereinafter referred to as the "old sheet-like material") is obtained by laminating a nanofiber layer on a base material (carrier) by an electrospinning method. Further, the polymer solution used for generating the nanofiber layer is a mixture of an acetic acid aqueous solution having a concentration of 4% by mass, water-soluble collagen, polyethylene glycol, and chitosan in a ratio of 100:1:3:6.

[0005] The old sheet-like material is used such that the nanofiber layer contacts the skin. For example, after applying lotion to the nanofiber layer and then sticking it to the cheek so that the nanofiber layer contacts the cheek, it can be used for moisturizing the cheek. Further, it can be said that the old sheet-like material is an excellent beauty product that is antibacterial and gentle to the user's body by using chitosan as a raw material.

[0006] Thus, although the old sheet-like material is an excellent beauty product that utilizes the properties of chitosan, the applicant for this application considered that further improvement was possible from the perspective of the flexibility of the base material. The cellophane film and polyvinyl alcohol film used for the base material of the old sheet-like material do become relatively soft by absorbing lotion, but considering application to more complex curved surfaces (for example, application to a facial pack), the flexibility is insufficient. Also, as a method of using the sheet-like material, a method such as "applying lotion through the base material after contacting the application site" can be considered, but the base material of the old sheet-like material before absorbing lotion has low flexibility, making it difficult to contact the application site.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0008] The applicant for this application was producing samples with base materials of various materials in order to change to a base material with higher flexibility, but noticed that a new problem of acetic acid odor had occurred. Theoretically, since most of the aqueous acetic acid solution contained in the polymer solution volatilizes during the spinning process and most of the remainder is removed by subsequent heat treatment, no acetic acid odor should remain, but in reality, the acetic acid odor remained. In particular, when the base material was hydrophilic, the acetic acid odor remained strongly. Since the sheet-like material may be applied to the face, such as a facial pack, eliminating the acetic acid odor is an important issue.

[0009] As a method of eliminating the acetic acid odor, a method of replacing the base material (transferring the nanofiber layer) after the normal manufacturing process can be considered, but the number of manufacturing processes increases, resulting in an increase in cost.

[0010] The present invention has been made in view of such conventional circumstances. One of the objects of the present invention is to provide a sheet-like material and a method for manufacturing the sheet-like material that do not generate an acetic acid odor regardless of the material of the base material, can be manufactured at low cost, and are suitably applicable to cosmetic use. Means for Solving the Problems and Effects of the Invention

[0011] According to the sheet-like material according to the first aspect of the present invention, it can be configured to include a sheet-like base material layer and an organic fiber layer formed in a sheet shape on one surface of the base material layer from a polymer solution containing chitosan, a water-soluble polymer, and a water-soluble organic acid excluding acetic acid by a dry spinning method.

[0012] According to the sheet-like material according to the second aspect of the present invention, the water-soluble polymer can be configured to include at least one of polyvinyl alcohol, gelatin, collagen peptide, polyethylene glycol, and polyglutamic acid, and the organic acid can be configured to include at least one of citric acid, succinic acid, malic acid, and lactic acid.

[0013] According to the sheet-like material according to the third aspect of the present invention, the polymer solution can be configured to contain 8% by mass or less of chitosan, 2% by mass or more of polyvinyl alcohol, and citric acid in an amount of not less than the mass% of chitosan and not more than 8% by mass.

[0014] According to the above configuration, a sheet-like material that does not generate an acetic acid odor, can be manufactured at low cost, and is suitably applicable to cosmetic use can be provided.

[0015] According to the sheet-like material according to the fourth aspect of the present invention, the organic fiber layer can be configured to be heated at 145°C to 170°C. According to the above configuration, the polyvinyl alcohol contained in the organic fiber layer can be crosslinked, and the organic fiber layer can be made insoluble. Thereby, a sheet-like material applicable to a cosmetic product of the type that peels off after use can be provided.

[0016] According to the sheet-like material according to the fifth aspect of the present invention, the base material layer can be configured to have hydrophilicity. According to the above configuration, the followability of the sheet-like material to a curved surface is improved, and the impregnation of the chemical solution becomes easy, so that it can be more suitably applied to beauty applications.

[0017] According to the sheet-like material according to the sixth aspect of the present invention, the dry spinning method can be configured to be an electrospinning method.

[0018] According to the method for manufacturing a sheet-like material according to the seventh aspect of the present invention, it is a method for manufacturing a sheet-like material including a sheet-like base material layer and an organic fiber layer formed in a sheet shape on one surface of the base material layer, and includes a preparation step of preparing a polymer solution containing a water-soluble organic acid excluding chitosan, a water-soluble polymer, and acetic acid, and a spinning step of forming the organic fiber layer on one surface of the base material layer from the polymer solution by a dry spinning method.

[0019] According to the method for manufacturing a sheet-like material according to the eighth aspect of the present invention, the preparation step can include a first preparation step of preparing a first solution containing the chitosan and the organic acid, a second preparation step of preparing a second solution containing the water-soluble polymer, and a third preparation step of mixing the first solution and the second solution to prepare the polymer solution.

[0020] According to the method for manufacturing a sheet-like material according to the ninth aspect of the present invention, the water-soluble polymer can include at least one of polyvinyl alcohol, gelatin, collagen peptide, polyethylene glycol, and polyglutamic acid, and the organic acid can include at least one of citric acid, succinic acid, malic acid, and lactic acid.

[0021] According to the method for manufacturing a sheet-like material according to the tenth aspect of the present invention, the polymer solution can include 8% by mass or less of chitosan, 2% by mass or more of polyvinyl alcohol, and citric acid in an amount of not less than the mass percentage of the chitosan and not more than 8% by mass.

[0022] According to the above configuration, a method for manufacturing a sheet-like material that does not produce an acetic acid odor, can be manufactured at low cost, and can be suitably applied to beauty applications can be provided.

[0023] According to the method for manufacturing a sheet-like material according to the 11th aspect of the present invention, it can be configured to include a heating step of heating the organic fiber layer formed in the spinning step at 145°C to 170°C. According to the above configuration, the polyvinyl alcohol contained in the organic fiber layer can be crosslinked, and the organic fiber layer can be made insoluble. Thereby, a sheet-like material applicable to beauty products of the type that peels off after use can be manufactured.

[0024] According to the method for manufacturing a sheet-like material according to the 12th aspect of the present invention, a crosslinking selection step of heating the organic fiber layer formed in the spinning step to select whether to crosslink the polyvinyl alcohol, and only when it is selected in the crosslinking selection step to crosslink the polyvinyl alcohol, a second heating step of heating the organic fiber layer formed in the spinning step at 145°C to 170°C can be configured to be included. According to the above configuration, by simply switching the presence or absence of heat treatment, both a sheet-like material applicable to beauty products of the type that does not peel off after use and a sheet-like material applicable to beauty products of the type that peels off after use can be manufactured.

[0025] According to the method for manufacturing a sheet-like material according to the 13th aspect of the present invention, the base material layer can be configured to have hydrophilicity. According to the above configuration, the followability of the manufactured sheet-like material to a curved surface is improved, and the impregnation of the chemical solution becomes easy, so it is more suitably applicable to beauty applications.

[0026] According to the method for manufacturing a sheet-like material according to the 14th aspect of the present invention, the dry spinning method can be configured to be the electrospinning method.

Brief Description of the Drawings

[0027]

Figure 1

Embodiments for Carrying Out the Invention

[0028] Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiments shown below are examples for embodying the technical idea of the present invention, and the present invention is not limited to the following. Also, this specification does not in any way specify the members shown in the claims as the members of the embodiments. In particular, the dimensions, materials, shapes, relative arrangements, etc. of the components described in the embodiments are not intended to limit the scope of the present invention only to those, but are merely illustrative examples. Note that the sizes and positional relationships of the members shown in each drawing may be exaggerated for clarity of explanation. In the following description, the same names and reference numerals indicate the same or equivalent members, and detailed descriptions will be omitted as appropriate. Also, each element constituting the present invention may be configured such that a plurality of elements are constituted by the same member and one member serves as a plurality of elements, or conversely, the functions of one member may be shared and realized by a plurality of members. In addition, the functions or processes of each element constituting the present invention can also be realized by artificial intelligence (AI: Artificial Intelligence) within a possible range. [Sheet-like object 1]

[0029] The sheet-like object 1 is a sheet-like object suitably applicable for cosmetic use, and includes a base material layer 11 and an organic fiber layer 12.

[0030] Hereinafter, each member will be described. 〔Base material layer 11〕

[0031] The base material layer 11 is a sheet-like member serving as the base material of the sheet-like object 1, and the organic fiber layer 12 is formed on one surface thereof.

[0032] Since the sheet-like material 1 has solved the problem of acetic acid odor (details will be described later), the material of the base material layer 11 is not particularly limited. For example, in the conventional technology, a hydrophilic base material with a strong remaining acetic acid odor can also be selected. Since the hydrophilic base material has high flexibility, its followability to a curved surface is improved, and since it is easy to impregnate with a chemical solution, the sheet-like material 1 can be more suitably applied to beauty applications. 〔Organic fiber layer 12〕

[0033] The organic fiber layer 12 is a sheet-like member formed on one surface of the base material layer 11. The organic fiber layer 12 is nanofibers formed from a polymer solution KYE (see Table 1) composed of 1.67% by mass of chitosan, 5.60% by mass of polyvinyl alcohol, 5.00% by mass of citric acid, and 87.73% by mass of ion-exchanged water by the dry spinning method.

Table 1

[0034] Thus, since the organic fiber layer 12 does not contain acetic acid in its raw materials, naturally, the problem of acetic acid odor is also solved.

[0035] In addition, since the organic fiber layer 12 contains polyvinyl alcohol and citric acid, by heating, the hydroxyl group of polyvinyl alcohol and the carboxyl group of citric acid can be ester-bonded (esterified). As a result, polyvinyl alcohol is crosslinked and the organic fiber layer becomes insoluble. In other words, the sheet-like material 1 according to the present invention can easily switch the presence or absence of insolubility depending on the presence or absence of heat treatment.

[0036] In addition, the mode of the organic fiber 12 is not limited to the above-mentioned one. For example, the content of chitosan can be appropriately changed as long as it is 8% by mass or less, the content of polyvinyl alcohol can be appropriately changed as long as it is 2% by mass or more, and the content of citric acid can be appropriately changed as long as it is not less than the content of chitosan and not more than 8% by mass.

[0037] The aforementioned numerical ranges were set based on the ability of citric acid to dissolve chitosan and the antibacterial properties of chitosan. Specifically, citric acid has a weaker ability to dissolve chitosan than acetic acid, and it may be difficult to dissolve chitosan unless the citric acid content is equal to or greater than the chitosan content. Furthermore, the inclusion of chitosan in the polymer solution KYE can impart antibacterial properties to the organic fiber layer 12, and keeping the content of each component within the aforementioned numerical ranges improves continuous productivity.

[0038] The organic fiber layer 12 is not limited to the above-described embodiments. For example, instead of polyvinyl alcohol, water-soluble polymers such as gelatin, collagen peptide, polyethylene glycol, and polyglutamic acid can be used, and instead of citric acid, water-soluble organic acids such as succinic acid, malic acid, and lactic acid (excluding acetic acid) can be used, or a combination of two or more of these can be used. [Sheet-like product manufacturing method]

[0039] A method for producing a sheet material according to one embodiment of the present invention will be described below with reference to the flowchart of FIG.

[0040] 1, the method for producing a sheet-like material according to one embodiment of the present invention comprises a preparation step ST101, a spinning step ST102, a cross-linking selection step ST103, and a heating step ST104. The heating step ST104 is performed only when it is selected to cross-link the polyvinyl alcohol in the cross-linking selection step ST103, and is not performed when it is selected not to cross-link the polyvinyl alcohol (details will be described later). [Preparation process ST101]

[0041] The preparation step ST101 is a step of preparing a polymer solution KYE to be used in the spinning step ST102, and includes a first preparation step ST101-1, a second preparation step ST101-2, and a third preparation step ST101-3. <First preparation step ST101-1>

[0042] In the first preparation step ST101-1, as shown in Table 2, 5.00% by mass of chitosan, 15.00% by mass of citric acid, and 80.00% by mass of ion-exchanged water are mixed to prepare a first solution YE1.

Table 2

[0043] In the second preparation step and ST101-2, as shown in Table 3, 8.40% by mass of polyvinyl alcohol and 91.60% by mass of ion-exchanged water are mixed to prepare a second solution YE2.

Table 3

[0044] In the third preparation step ST101-3, the first solution YE1 and the second solution YE2 are mixed at a ratio of 1:2 to complete the polymer solution KYE shown in Table 1.

[0045] Note that the mode of the preparation step ST101 is not particularly limited and can be changed as appropriate. Also, the preparation step ST101 described here is for the case of preparing the polymer solution KYE shown in Table 1. When changing the content of each component, the amount of each component in each step is adjusted accordingly. Additionally, other arbitrary components may be included. 〔Spinning step ST102〕

[0046] The spinning step ST102 is a step of forming an organic fiber layer 12 on one surface of a base material layer 11 by a dry spinning method. More specifically, by the dry spinning method, ion-exchanged water, which is a solvent, is vaporized from the polymer solution KYE to spin an organic fiber composed of chitosan, citric acid, and polyvinyl alcohol, and the organic fiber layer 12 is formed from the organic fiber.

[0047] Since acetic acid is not contained in the polymer solution KYE, naturally, there is no acetic acid odor in the organic fiber layer 12 or the base material layer 11.

[0048] The type of dry spinning method is not particularly limited, but for example, an electrospinning method can be used to form an organic fiber layer made of nanofibers. [Crosslinking Selection Step ST103]

[0049] The cross-linking selection step ST103 is a step of selecting whether or not to heat the organic fiber layer 12 formed in the spinning step ST102 to cross-link the polyvinyl alcohol.

[0050] If cross-linking is selected, a heating step ST104, which will be described later, is carried out, whereas if cross-linking is not selected, the sheet material 1 is completed at this point.

[0051] In this way, the sheet material 1 according to the present invention can be easily switched between insoluble and insoluble state depending on whether or not it is heat-treated. That is, the sheet material 1 according to the present invention is applicable to both beauty products that do not need to be peeled off after use (they dissolve and disappear) and beauty products that do need to be peeled off after use.

[0052] The manner of "selection" here is not particularly limited, and includes, for example, a decision by a manager of the production of the sheet-like material 1 as to whether or not to perform a heat treatment, operation of a device by a person who operates a device for performing the heating step ST104 described below, and selection of whether or not to make the sheet-like material 1 insoluble by a purchaser of the sheet-like material 1. [Heating process ST104]

[0053] The heating step ST104 is a step of heating the organic fiber layer 12 at 145°C to 170°C.

[0054] Since the organic fiber layer 12 contains polyvinyl alcohol and citric acid, when the organic fiber layer 12 is heated, the hydroxyl groups of the polyvinyl alcohol and the carboxyl groups of the citric acid form ester bonds, the polyvinyl alcohol is crosslinked, and the organic fiber layer becomes insoluble.

[0055] The heating step ST104 may be performed in any manner. [Effects of the present invention]

[0056] As described above, the sheet-like material 1 and the method for manufacturing the sheet-like material according to an embodiment of the present invention do not generate an acetic acid odor and can be manufactured at low cost. Further, since no acetic acid odor is generated, a hydrophilic base material can be used. In this case, the followability to a curved surface is improved and the impregnation of the chemical solution becomes easy, so that it can be suitably applied to beauty applications. Further, by simply switching the presence or absence of heat treatment, it is possible to manufacture both a sheet-like material applicable to a beauty product that does not peel off after use and a sheet-like material applicable to a beauty product that peels off after use.

Explanation of Signs

[0057] 1... Sheet-like material 11... Base material layer 12... Organic fiber layer KYE... Polymer solution YE1... First solution YE2... Second solution

Claims

1. A sheet-shaped base material layer, An organic fiber layer formed in a sheet shape on one surface of the base material layer from a polymer solution containing chitosan, a water-soluble polymer, and a water-soluble organic acid excluding acetic acid by a dry spinning method, A sheet-shaped article comprising the same.

2. The sheet-shaped article according to Claim 1, The water-soluble polymer contains at least one of polyvinyl alcohol, gelatin, collagen peptide, polyethylene glycol, and polyglutamic acid, The organic acid contains at least one of citric acid, succinic acid, malic acid, and lactic acid, Sheet-shaped article.

3. The sheet-shaped article according to Claim 1, The polymer solution, Contains 8% by mass or less of chitosan, Contains 2% by mass or more of polyvinyl alcohol, Contains citric acid in an amount of not less than the mass% of the chitosan and not more than 8% by mass, Sheet-shaped article.

4. The sheet-shaped article according to Claim 3, The sheet-shaped article in which the organic fiber layer is heated at 145°C to 170°C.

5. The sheet-shaped article according to Claim 1, The sheet-shaped article in which the base material layer has hydrophilicity.

6. The sheet-shaped article according to Claim 1, The sheet-shaped article in which the dry spinning method is an electrospinning method.

7. A method for manufacturing a sheet-shaped article comprising a sheet-shaped base material layer and an organic fiber layer formed in a sheet shape on one surface of the base material layer, A preparation step of preparing a polymer solution containing chitosan, a water-soluble polymer, and a water-soluble organic acid excluding acetic acid, A spinning step of forming the organic fiber layer on one surface of the base material layer from the polymer solution by a dry spinning method, A method for manufacturing a sheet-shaped article including the above.

8. The method for manufacturing a sheet-shaped article according to Claim 7, The preparation step, A first preparation step of preparing a first solution containing the chitosan and the organic acid, A second preparation step of preparing a second solution containing the water-soluble polymer, A third preparation step of mixing the first solution and the second solution to prepare the polymer solution, A method for manufacturing a sheet-shaped article including the above.

9. The method for manufacturing a sheet-shaped article according to Claim 7, The water-soluble polymer contains at least one of polyvinyl alcohol, gelatin, collagen peptide, polyethylene glycol, and polyglutamic acid, The organic acid contains at least one of citric acid, succinic acid, malic acid, and lactic acid, Method for manufacturing a sheet-shaped article.

10. The method for manufacturing a sheet-like material according to claim 7, wherein the polymer solution contains chitosan at 8% by mass or less, contains polyvinyl alcohol at 2% by mass or more, contains citric acid at a mass percentage equal to or more than the mass percentage of the chitosan and 8% by mass or less, A method for manufacturing a sheet-like material.

11. The method for manufacturing a sheet-like material according to claim 10, further comprising a heating step of heating the organic fiber layer formed in the spinning step at 145°C to 170°C, A method for manufacturing a sheet-like material comprising the above.

12. The method for manufacturing a sheet-like material according to claim 10, further comprising a crosslinking selection step of heating the organic fiber layer formed in the spinning step to select whether to crosslink the polyvinyl alcohol, a heating step of heating the organic fiber layer formed in the spinning step at 145°C to 170°C, which is only carried out when it is selected to crosslink the polyvinyl alcohol in the crosslinking selection step, A method for manufacturing a sheet-like material comprising the above.

13. The method for manufacturing a sheet-like material according to claim 7, wherein the base material layer has hydrophilicity. A method for manufacturing a sheet-like material.

14. The method for manufacturing a sheet-like material according to claim 7, wherein the dry spinning method is an electrospinning method. A sheet-like material.

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