Composite film for forming structures and self-standing bags

Abstract

To provide a composite film for structure formation which does not need to separately prepare a reinforcement material, is soft at the time of filling of a content by a hot filling method, and enables manufacture of a self-standing bag maintaining self-standing property when the content is reduced at the time of use, and a self-standing bag manufactured using the composite film for structure formation.SOLUTION: A composite film including a specific functional material layer is applied as a material constituting a self-standing bag. Specifically, the material constituting the self-standing bag is formed into a composite film for structure formation in which a base material layer, a functional material layer and a sealant layer are stacked in this order, and the functional material layer as a core material is impregnated or coated with amorphous polyester.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a composite film for forming a structure and a self-standing bag. [Background technology]

[0002] Conventionally, packaging bags filled with contents lack rigidity, and as the contents decrease, the sides may bend or otherwise deform, causing problems with the bag's ability to stand upright.

[0003] In contrast, in Patent Document 1, a cylindrical A method has been proposed for improving the self-standing ability of the self-standing bag by adhesively holding the upper horizontal seal of the package at the top of the main body.

[0004] Patent Document 2 proposes a self-standing bag that aims to stand upright by reinforcing the side edges of the packaging bag with a reinforcing material.

[0005] Patent Document 3 proposes a self-standing bag (air-hold pouch) in which an independent air chamber with a handle function is provided within the outer edge seal that forms the body of the bag. The self-standing bag described in Patent Document 3 is said to improve the ability to stand on its own when displayed as a product and the ease of handling when pouring out the contents. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] International Publication No. 2013 / 054411 [Patent Document 2] Japanese Patent Application Laid-Open No. 2007-055649 [Patent Document 3] Japanese Patent Application Laid-Open No. 2006-036213 Summary of the Invention [Problem to be solved by the invention]

[0007] The bags described in Patent Documents 1 to 3 required reinforcing materials or structural elements for reinforcement in addition to the bag itself, and required a dedicated bag-making and filling machine when filling the contents.

[0008] Furthermore, although the use of reinforcing materials improves the self-supporting ability, the rigidity is also increased to provide the self-supporting ability, which makes it difficult for the bag to expand when filled with contents, making it difficult to fill the required amount of contents.

[0009] The present invention has been made in view of the above background, and aims to provide a structure-forming composite film, which makes it possible to produce a self-standing bag that is soft when filled with contents by a hot filling method and that can maintain its self-standing ability as the contents decrease during use, without the need to prepare a reinforcing material or structural element for reinforcement separately from the bag body, and a self-standing bag produced using the structure-forming composite film. [Means for solving the problem]

[0010] The present inventors conducted extensive research to solve the above-mentioned problems, and discovered that by using a composite film containing a specific functional material layer as a constituent material of a self-standing bag, it is possible to realize a self-standing bag that is soft when filled with contents by a hot filling method and that maintains its self-standing ability during use, without the need for a reinforcing material or the like separate from the bag body, and this led to the completion of the present invention.

[0011] <<Aspect 1>> a functional material layer and a sealant layer, The functional material layer is formed by impregnating or coating a core material with an amorphous polyester. Composite film for structural formation. <<Aspect 2>> 2. The composite film for forming a structure according to aspect 1, wherein the core material is a fiber structure. Aspect 3 3. The composite film for forming a structure according to aspect 2, wherein the fiber structure is at least one selected from the group consisting of paper, nonwoven fabric, and woven fabric. Aspect 4 The structure-forming composite film according to any one of Aspects 1 to 3, wherein the amorphous polyester is an aqueous dispersion of amorphous polyester. Aspect 5 The structure-forming composite film according to any one of Aspects 1 to 3, wherein the amorphous polyester is an amorphous polyester-containing solution. Aspect 6 6. The structure-forming composite film according to any one of Aspects 1 to 5, wherein the amorphous polyester has a glass transition temperature or softening point of 30 to 80°C. Aspect 7 Loss tangent tanδ at 30℃ 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ 7. The structure-forming composite film according to any one of aspects 1 to 6, wherein is 1.04 to 5.00. Aspect 8 The structure-forming composite film according to any one of aspects 1 to 7, further comprising a substrate layer. Aspect 9 9. The structure-forming composite film according to aspect 8, wherein the base layer, the functional material layer, and the sealant layer are laminated in this order. Aspect 10 A self-standing bag, at least a portion of which is made of the composite film for forming a structure according to any one of the first to ninth embodiments. Aspect 11 A self-standing bag, at least the body of which is made of the composite film for forming a structure according to any one of the first to ninth embodiments. Aspect 12 12. The self-standing bag according to claim 10 or 11, which is used in a hot filling method. [Effects of the Invention]

[0012] According to the composite film for forming a structure of the present invention, there is no need to prepare a reinforcing material or the like in addition to the bag body, and it is possible to produce a self-standing bag that is soft when filled with contents by the hot filling method and that can maintain its self-standing ability as the contents decrease during use.

[0013] Therefore, since the bag easily expands when filling it with contents, it is easy to fill it with the required amount of contents, and at the same time, since it is rigid, it can maintain its independence as the contents are used. [Brief explanation of the drawings]

[0014] [Figure 1] 1 is a schematic cross-sectional view showing one embodiment of a composite film for structure formation of the present invention. [Figure 2] FIG. 1 is a development view of the self-standing bags produced in the examples and comparative examples. [Figure 3] 1A and 1B are diagrams showing self-standing bags produced in Examples and Comparative Examples. DETAILED DESCRIPTION OF THE INVENTION

[0015] <<Composite film for structural formation>> The composite film for forming a structure of the present invention essentially comprises a functional material layer and a sealant layer. The functional material layer is a layer in which a core material is impregnated with or coated with an amorphous polyester.

[0016] By virtue of having the above-described configuration, the composite film for forming a structure of the present invention, when made into a self-standing bag, does not require the preparation of a reinforcing material or the like in addition to the bag body, and is soft when filled with contents by the hot filling method, but is rigid enough to maintain its self-standing ability as the contents decrease during use.

[0017] <Configuration of composite film for forming structure> The configuration of the structure-forming composite film of the present invention will be described below with reference to the drawings: Fig. 1 shows a schematic cross-sectional view of one embodiment of the structure-forming composite film of the present invention.

[0018] 1 , a composite film 100 for forming a structure according to one embodiment of the composite film for forming a structure of the present invention includes a base layer 10, a functional material layer 20 laminated on the inner side of the base layer 10, and a sealant layer 30 laminated on the inner side of the functional material layer 20. The functional material layer 20 is made of a nonwoven fabric 21 and an amorphous polyester 22 impregnated into or applied to the nonwoven fabric 21, and is laminated so that the surface impregnated with or applied with the amorphous polyester 22 comes into contact with the sealant layer 30.

[0019] The structure-forming composite film of the present invention may include any other layer, such as a substrate layer or an adhesive layer, as long as it contains a functional material layer and a sealant layer as essential components.

[0020] The structure-forming composite film 100 shown in FIG. 1 has a functional material layer 20 and a sealant layer 30, which are essential constituent layers in the present invention, and also has a base layer 10 as an optional layer.

[0021] In addition, when the composite film for forming a structure of the present invention has a base material layer as an optional layer, it is preferable that the base material layer, functional material layer, and sealant layer are laminated in this order.

[0022] The thickness, shape, etc. of the composite film for forming a structure of the present invention can be appropriately determined depending on the application site in the structure to be formed, the use of the structure to be formed, etc.

[0023] <Function of composite film for structural formation> The composite film for forming a structure of the present invention has a configuration including a functional material layer and a sealant layer. In the present invention, by forming the functional material layer from a specific material, it is possible to realize, for example, a self-standing bag, which does not require the preparation of a reinforcing material in addition to the bag body, and which is soft when filled with contents by a hot filling method, but which maintains its self-standing ability due to its rigidity as the contents decrease during use.

[0024] Furthermore, the composite film for forming a structure of the present invention has a loss tangent tanδ at 30°C. 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ However, if the value is within a specific range, the above-mentioned effect can be more reliably achieved.

[0025] Specifically, the loss tangent tanδ at 30°C 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ However, when the refractive index is in the range of 1.04 to 5.00, the bag is soft and easily expands at around 60 to 90°C when the contents are filled using the hot filling method, making it easy to fill the required amount of contents, and in an environment of 30°C or less when in use, when the contents decrease with use, the bag is rigid and can maintain its independence.

[0026] Loss tangent tanδ at 30℃ 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ is preferably in the range of 1.05 to 4.00, and more preferably in the range of 1.18 to 3.50.

[0027] <Functional material layer> The functional material layer constituting the composite film for structure formation of the present invention is an essential constituent layer in the composite film for structure formation. The functional material layer is a layer in which a core material is impregnated with or coated with an amorphous polyester.

[0028] The composite film for forming a structure of the present invention has a functional material layer, and thus can meet various required properties such as self-supporting ability, handling properties, usability, and burst strength.

[0029] Furthermore, in the present invention, by adjusting the composition of the functional material layer, it is possible to control the physical properties of the entire composite film for forming a structure, and for example, it is possible to set the ratio of the loss tangent tanδ at a specific temperature within a specific range as described above. As a result, it is possible to realize a self-standing bag that is soft when filled with contents by the hot filling method and that can maintain its self-standing ability as the contents decrease during use.

[0030] (Configuration of functional material layer) The functional material layer constituting the composite film for structure formation of the present invention has a configuration in which a core material is impregnated with or coated with an amorphous polyester.

[0031] In the functional material layer, the amorphous polyester may be filled throughout the entire thickness of the core material, or part of the amorphous polyester may be disposed inside the core material and part may be disposed on the surface of the core material.

[0032] The structure-forming composite film 100 shown in FIG. 1 is a functional material layer 20 in which part of the amorphous polyester 22 is disposed inside the nonwoven fabric 21 and part is disposed on the surface of the nonwoven fabric 21 .

[0033] (Arrangement of functional material layers) 1 , in one embodiment of the composite film for forming a structure 100 of the present invention, the functional material layer 20 is disposed between the base material layer 10 and the sealant layer 30. The functional material layer 20 comprises a nonwoven fabric 21 and an amorphous polyester 22 impregnated into or coated on the nonwoven fabric 21, and is disposed so that the surface impregnated with or coated with the amorphous polyester 22 faces the sealant layer 30.

[0034] In the functional material layer 20 in the structure-forming composite film 100 according to one embodiment of the present invention shown in FIG. 1, the surface impregnated with or coated with the amorphous polyester 22 faces the sealant layer 30, but in the present invention, the surface impregnated with or coated with the amorphous polyester may be located either on the sealant layer side or on the base material layer side.

[0035] {Core material} The core material constituting the functional material layer is not particularly limited as long as it can be impregnated with or coated with an amorphous polyester. For example, it may be a fiber structure. The fiber structure has a large number of voids. The voids may penetrate through the layer in the thickness direction or may be discontinuous. The large number of voids present can then be impregnated with or coated with the amorphous polyester described below.

[0036] The fiber structure may be at least one selected from the group consisting of paper, nonwoven fabric, and woven fabric.

[0037] When the core material is a nonwoven fabric, any of needle-punched nonwoven fabric, water-jet punched nonwoven fabric, spunbonded nonwoven fabric, etc. When the core material is a woven fabric, any of plain weave, plain basket weave, twill weave, satin weave, cord weave, triaxial weave, tetraaxial weave, and three-dimensional weave, etc., can be used.

[0038] The material constituting the core is not particularly limited, but may be, for example, a thermoplastic or thermosetting resin such as polyesters such as polyethylene terephthalate (PET) or polylactic acid, or polyamides (PA) such as nylon-6 or nylon-66, or a natural material such as pulp.

[0039] The basis weight and thickness of the core material used in the present invention are not particularly limited, and can be appropriately selected depending on the type and amount of amorphous polyester to be impregnated or coated.

[0040] (amorphous polyester) The amorphous polyester impregnated into or coated on the core material is not particularly limited as long as it can exert the effects of the present invention.

[0041] Here, "amorphous" in the present invention means that there is no clear melting peak when the temperature is raised from -100°C to 300°C at a rate of 20°C / min using a differential scanning calorimeter (DSC).

[0042] The glass transition temperature (Tg) of the amorphous polyester that can be a constituent of the functional material layer is not particularly limited, but may be, for example, 30 to 80° C. This glass transition temperature (Tg) may be 75° C. or lower, 70° C. or lower, 65° C. or lower, 60° C. or lower, 55° C. or lower, or 50° C. or lower, or may be 35° C. or higher, or 40° C. or higher.

[0043] When the amorphous polyester has a glass transition temperature (Tg) within the above range, the loss tangent tanδ of the composite film for forming a structure at 30°C is 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ can be in the range of 1.04 to 5.00.

[0044] In this specification, the glass transition temperature (Tg) refers to the midpoint glass transition temperature (°C) determined by heat flux differential scanning calorimetry (heat flux DSC) at a heating rate of 10°C / min in accordance with JIS K7121 (1987), and the condition of the test specimen is adjusted in accordance with JIS K7121's "measurement of the glass transition temperature after a certain heat treatment."

[0045] The softening point of the amorphous polyester that can be a constituent of the functional material layer is preferably in the range of 30 to 80° C. The softening point of the amorphous polyester may be 35° C. or higher, 40° C. or higher, 45° C. or higher, or 50° C. or higher, or may be 75° C. or lower, 70° C. or lower, 65° C. or lower, 60° C. or lower, 55° C. or lower, or 50° C. or lower.

[0046] When the amorphous polyester has a softening point within the above range, the loss tangent tanδ of the composite film for forming a structure at 30°C is 30℃ Loss tangent tanδ at 80℃80℃ tanδ is the ratio of 80℃ / tanδ 30℃ can be in the range of 1.04 to 5.00.

[0047] In the present invention, the softening point refers to the Vicat softening temperature measured by the A50 method (test load 10 N and heating rate 50°C / hour) among the Vicat softening temperatures specified in JIS K7206:2016 (ISO 306:2013) ("Plastics - Thermoplastics - Determination of Vicat softening temperature (VST)").

[0048] The number average molecular weight of the amorphous polyester is not particularly limited, and may be, for example, 50,000 or less, 45,000 or less, 40,000 or less, 350,000 or less, 30,000 or less, 25,000 or less, 20,000 or less, or 150,000 or less. On the other hand, it may be 4,000 or more, 5,000 or more, 6,000 or more, 7,000 or more, 8,000 or more, 9,000 or more, or 10,000 or more.

[0049] The number average molecular weight in this specification means a number average molecular weight measured by gel permeation chromatography using tetrahydrofuran as a solvent and polystyrene as a standard.

[0050] The amorphous polyester that can be a constituent component of the functional material layer of the structure-forming composite film of the present invention may be an amorphous polyester containing 50 mol % of a dicarboxylic acid component and 50 mol % of a diol component, and may also be an amorphous polyester containing 30 mol % or more of terephthalic acid, 25 mol % or more of ethylene glycol, and 5 to 45 mol % of other dicarboxylic acid components and / or other diol components.

[0051] Examples of other dicarboxylic acid components include aromatic dibasic acids such as isophthalic acid, orthophthalic acid, 1,5-naphthalic acid, 2,6-naphthalic acid, 4,4'-diphenyldicarboxylic acid, 2,2'-diphenyldicarboxylic acid, and 4,4'-diphenyletherdicarboxylic acid; and aliphatic or alicyclic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, 1,4-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 4-methyl-1,2-cyclohexanedicarboxylic acid, and dimer acid.

[0052] Examples of other diol components include propylene glycol, 1,3-propanediol, 2-methyl-1,3-propanediol, 1,2-butanediol, 1,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, neopentyl glycol, diethylene glycol, dipropylene glycol, 2,2,4-trimethyl-1,3-pentanediol, cyclohexanedimethanol, neopentyl hydroxypivalic acid ester, 1,9-nonanediol, 2-methyloctanediol, 1,10-dodecanediol, 2-butyl-2-ethyl-1,3-propanediol, and tricyclodecane dimethanol.

[0053] The amorphous polyester may be used alone or in combination of two or more. When two or more amorphous polyesters are used in combination, for example, a mixture of amorphous polyesters having different physical properties may be used.

[0054] The form of the amorphous polyester is not particularly limited as long as the amorphous polyester is impregnated into or coated on a core material, and may be, for example, an amorphous polyester aqueous dispersion in which the amorphous polyester is dispersed in water, or an amorphous polyester-containing solution in which the amorphous polyester is dissolved in an organic solvent.

[0055] Among these, when an amorphous polyester aqueous dispersion in which an amorphous polyester is dispersed in water is used, the residual solvent in the obtained structure-forming composite film can be reduced, and therefore, when the structure-forming composite film of the present invention is used as, for example, a food packaging material, the flavor of the food contained therein is not impaired, making it preferable.

[0056] Furthermore, even when an amorphous polyester-containing solution in which an amorphous polyester is dissolved in an organic solvent is used, the residual solvent in the structure-forming composite film of the present invention can be reduced by using, as the organic solvent, an acetate ester or formate ester such as ethyl acetate, n-butyl acetate, isobutyl acetate, isopropyl acetate, methyl acetate, propyl acetate, or ethyl formate, which belongs to residual solvent class 3 (low-toxicity solvents) (Guidelines for Residual Solvents in Pharmaceuticals (ICH notification of February 4, 2011)).

[0057] Commercially available amorphous polyester water dispersions include, for example, polyester resin emulsions in the "Elitel (registered trademark)" series (Unitika Ltd.).

[0058] (Impregnation or coating method) The method for impregnating or coating the core material with the amorphous polyester is not particularly limited, and any known method can be used, such as gravure coating, dipping, suction, air knife coating, die coating, comma coating, fountain coating, gravure offset coating, and hot melt coating.

[0059] (Amount of impregnation or application) The amount of amorphous polyester to be impregnated or applied is not particularly limited, and can be appropriately selected depending on the basis weight and thickness of the core material and the type of amorphous polyester.

[0060] <Sealant layer> The sealant layer constituting the composite film for forming a structure of the present invention is a layer that is heat-sealed when forming a structure such as a self-standing bag, etc. Therefore, the sealant layer becomes the innermost layer of the composite film for forming a structure.

[0061] The material for the sealant layer is not particularly limited as long as it is heat-adhesive and can provide sufficient sealing strength to the molded structure. Known materials can be used, such as low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), polypropylene (PP), ethylene-propylene copolymer (EP), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ionomer resin, and ethylene-vinyl acetate copolymer (EVA).

[0062] For example, when forming a structure such as a self-standing bag filled with contents, the sealant layer constituting the composite film for forming a structure of the present invention is a layer that forms a space for filling the contents in. Therefore, when it is desired to impart resistance to contents, it is preferable to use, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), etc.

[0063] The sealant layer constituting the composite film for forming a structure of the present invention may be formed using a film preformed from the above-mentioned materials, or may be formed by melting and extruding a material for forming the sealant layer onto the surface of a laminate in which a functional material layer and, if necessary, other layers are laminated, and then cooling and solidifying the material.

[0064] Furthermore, the resins constituting the sealant layer may be one type or a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0065] <Base material layer> The composite film for forming a structure of the present invention has a functional material layer and a sealant layer as essential constituent layers, but may also include a base layer. When the base layer is included, it is preferable that the base layer, functional material layer, and sealant layer are laminated in this order.

[0066] In an embodiment in which the base layer, functional material layer, and sealant layer are laminated in this order, the base layer becomes the outer layer of the bag body when a structure such as a self-standing bag is formed. Therefore, it can serve as a protective layer when the sealant layer, which is the innermost layer, is heat-sealed to form a structure. It can also serve as a printing layer on which printing is performed to display the contents, etc.

[0067] The material constituting the base layer is not particularly limited as long as it is a resin, etc., particularly a resin that can be used as a protective layer and that can be printed on. Commonly used resins can be used, for example, polyesters such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), and polybutylene terephthalate (PBT), polyolefins such as polyethylene (PE), polypropylene (PP), and polystyrene (PS), polyamides (PA) such as nylon-6 and nylon-66, and polycarbonate (PC).

[0068] The resins constituting the base layer may be one type or a blend of two or more types, and additives for imparting functionality, etc. may be blended as necessary.

[0069] The substrate layer is preferably made from a preformed film. The film to be the substrate layer may be a film formed from the above-mentioned resin or the like, and may be unstretched or uniaxially or biaxially stretched. Among these, a biaxially stretched film is preferred.

[0070] Furthermore, a metal such as aluminum or an oxide such as silicon oxide or aluminum oxide may be vapor-deposited on the film that serves as the substrate layer.

[0071] <Other layers> The structure-forming composite film of the present invention may contain layers other than the functional material layer and the sealant layer as long as they are essential constituent layers. When the structure-forming composite film of the present invention contains a base layer, the base layer, the functional material layer, and the sealant layer are preferably laminated in this order, and other layers can be disposed, for example, between the base layer, the functional material layer, and the sealant layer, or on the outside of the laminate containing these layers.

[0072] The other layers are not particularly limited, and examples thereof include a barrier layer for imparting barrier properties to the structure to be produced, a reinforcing layer for reinforcing the strength of the structure, and an adhesive layer for bonding layers together.

[0073] Examples of barrier layers that can be used to impart barrier properties to the structure being fabricated include layers made of ethylene-vinyl alcohol copolymer (EVOH), nylon (NY), polyvinylidene chloride (PVDC), or polyacrylonitrile (PAN), which exhibit the function of blocking gases such as oxygen and water vapor.

[0074] Examples of materials for the reinforcing layer to reinforce the strength of the structure to be produced include paper, synthetic paper, nonwoven fabric, etc. These may be coated with an adhesive to provide adhesion to adjacent layers. Also, a layer made of the material that constitutes the above-mentioned base layer may be provided as a reinforcing layer, separate from the base layer.

[0075] Examples of adhesive layers for bonding layers include layers made of ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), and ionomer.

[0076] The other layer may be a layer made of an adhesive used when dry laminating or hot melt laminating the substrate layer and the functional material layer, or the functional material layer and the sealant layer, or the like.

[0077] The resins constituting the other layers may be one type or a blend of two or more types. If necessary, additives may be added to impart functionality.

[0078] <<Method for manufacturing a composite film for forming a structure>> The method for producing the composite film for structure formation of the present invention is not particularly limited, and any method capable of forming a laminated composite film can be used. Known methods can be used, such as dry lamination, hot melt lamination, extrusion lamination, and sandwich lamination.

[0079] 《Structure》 The structure formed using the composite film for structure formation of the present invention is not particularly limited. Since the composite film for structure formation of the present invention has a sealant layer as its innermost layer, structures of various shapes can be formed by heat-sealing the composite film for structure formation of the present invention to itself or to other materials.

[0080] Examples include three-sided sealed bags, four-sided sealed bags, gusseted packaging bags, pillow packaging bags, Gabeltop-type bottomed containers, Tetra Classic (registered trademark), Brick Pack (registered trademark), tube containers, lids, etc. Furthermore, a zipper can be provided on the sealant layer to form a zippered packaging bag.

[0081] In the present invention, a self-standing bag at least a part of which is made of the composite film for forming a structure of the present invention is preferred, and a self-standing bag at least the body of which is made of the composite film for forming a structure of the present invention is particularly preferred.

[0082] The self-standing bag made of the composite film for forming a structure of the present invention is soft when filled with contents by the hot filling method, and can maintain its self-standing property as the contents decrease during use, without the need for a reinforcing material separate from the bag body. Therefore, since the bag easily expands when filled with contents, it can be easily filled with the required amount of contents, and at the same time, since it is rigid when the contents are used, it can maintain its self-standing property.

[0083] Therefore, the self-standing bag made of the structure-forming composite film of the present invention is preferably a self-standing bag used in the hot filling method.

[0084] Applicable contents The contents that can be filled into the structure formed from the composite film for structure formation of the present invention are not particularly limited as long as they are liquids including gels, gels, pastes, etc. Examples of liquids include medicines, quasi-drugs, cosmetics, detergents, foods, paints, etc.

[0085] Examples of pharmaceuticals and quasi-drugs include injections, drip infusions, infusions, perfusions, decoctions, etc. Examples of cosmetics include shampoos, conditioners, hair styling products (e.g., hair water, hair liquid, grease, etc.), etc. Examples of detergents include neutral detergents, alkaline detergents, and acidic detergents. Examples of foods include beverages, cooking oils, soups, creams, liquid seasonings (e.g., soy sauce, vinegar, noodle soup, simmered sauce, mirin, Worcestershire sauce, dressings, ketchup, Tabasco, sweeteners, etc.), etc. Examples of paints include paints, varnishes, oil stains, etc.

[0086] The contents may be in the form of a gel, a gel or a paste, and examples thereof include toothpaste, wasabi, jelly, jam, miso, etc.

[0087] The structure formed from the composite film for structure formation of the present invention is easy to fill with the required amount of contents because the bag is soft at around 80° C. Therefore, it is preferable that the contents be hot-filled at a temperature of around 60 to 90° C., as this allows the effects of the present invention to be fully enjoyed. [Example]

[0088] EXAMPLES The present invention will be described in more detail below with reference to examples and comparative examples, but the present invention is not limited to these.

[0089] <Material> In the examples and comparative examples, the following materials were prepared as materials for constituting the layers.

[0090] (1) Base material layer PET-1: PET film (Emblett (registered trademark) PET, Unitika Ltd., thickness: 12 μm) PET-2: Recycled PET film (Emblett (registered trademark) CEPB, Unitika Ltd., thickness: 12 μm) Ny-1: Biomass-derived nylon film (Bioprana® DN030, Toyobo Co., Ltd., thickness: 15 μm) Ny-2: Nylon film (RX, Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm)

[0091] (2) Functional material layer Core material Nonwoven fabric 1: Polylactic acid nonwoven fabric (Terramac (registered trademark) L0303, Unitika Ltd., basis weight: 30 g / m 2 ) Nonwoven fabric-2: Polyethylene terephthalate nonwoven fabric (Dila (registered trademark) D0403, Unitika Ltd., basis weight: 40 g / m 2 ) Paper 75g: Unglazed Kraft Paper (Basis Weight: 75g / m 2 ) Coating agent Amorphous polyester resin emulsion: Elitel (registered trademark) KA-1449 (glass transition temperature (Tg): 41°C, number average molecular weight (Mn): 8,500, Unitika Ltd.) Amorphous polyester resin emulsion: Elitel (registered trademark) KT-9204 (number average molecular weight (Mn): 17,000, Unitika Ltd.) Amorphous polyester resin: Vylon (registered trademark) 600 (glass transition temperature (Tg): 47°C, number average molecular weight (Mn): 16,000, Toyobo Co., Ltd.) PCL: Polycaprolactone (Placcel (registered trademark) H1P, Daicel Corporation, melting point (mp): 60°C)

[0092] (3) Sealant layer LL♯50: LLDPE film (SE625L, Tamapoly Corporation, thickness: 50 μm) LL♯70: LLDPE film (SE625L, Tamapoly Corporation, thickness: 70 μm) LL♯95: LLDPE film (SE620A, Tamapoly Corporation, thickness: 95 μm)

[0093] (4) Middle class Ny-1: Biomass-derived nylon film (Bioprana® DN030, Toyobo Co., Ltd., thickness: 15 μm) Ny-2: Nylon film (RX, Kohjin Film & Chemicals Co., Ltd., thickness: 15 μm) VM-PET: Aluminum-deposited PET film (VM-PET BR-1012, Toray Advanced Film Co., Ltd., thickness: 12 μm)

[0094] (5) Adhesive layer LDPE [Resin]: Low-density polyethylene (Suntec (registered trademark) L1850K, Asahi Kasei Corporation) EMAA [resin]: ethylene-methacrylic acid copolymer (Nucrel® AN4228C, Mitsui Dow Polychemicals Co., Ltd.) Two-component urethane adhesive (Rock Paint Co., Ltd.) (base:hardener = 10:1 (weight ratio)) Main agent: RU-50 Hardener: H-4 Two-component curing dry laminating adhesive (Mitsui Chemicals, Inc.) Main ingredient: Takelac A525 Hardener: Takenate A52

[0095] Example 1 <Preparation of composite film for structural formation> A composite film for forming a structure was produced in the layering order shown in Table 1. A low-density polyethylene (LDPE) adhesive layer was extruded and sandwiched between the Ny-1 film, which served as the intermediate layer, and the nonwoven fabric-1, which served as the core material, to produce a laminate consisting of the core material and the intermediate layer. The thickness of the low-density polyethylene (LDPE) layer was set to 20 μm.

[0096] Hereinafter, adhesive layers are indicated by " / / ".

[0097] Amorphous polyester resin emulsions Elitel (registered trademark) KA-1449 and Elitel (registered trademark) KT-9204 were mixed in a weight ratio of KA-1449:KT-9204 = 4:1 to prepare a coating liquid. The prepared coating liquid was applied to the core material (nonwoven fabric-1) of the laminate consisting of the core material / intermediate layer prepared above in a solid content of 2 g / m 2 By gravure coating the resulting mixture in the following order, a laminate consisting of a functional material layer and an intermediate layer was produced.

[0098] In Table 1, the functional material layers are listed in parentheses.

[0099] A low-density polyethylene (LDPE) adhesive layer was extruded and sandwiched between the PET-2 film substrate and the functional material layer of the laminate prepared above, resulting in a laminate consisting of the functional material layer and intermediate layer. The thickness of the LDPE layer was 20 μm.

[0100] Next, low-density polyethylene (LDPE) was extruded and sandwiched between the intermediate layer side of the laminate consisting of the base layer / functional material layer / intermediate layer and the LL#50 film that served as the sealant layer to produce a composite film for forming a structure consisting of the base layer / functional material layer / intermediate layer / sealant layer. The thickness of the low-density polyethylene (LDPE) layer was set to 20 μm.

[0101] <Measurement of loss tangent tanδ> Using a dynamic viscoelasticity apparatus (DMA Q800, TA Instruments), the loss tangent tanδ at 30°C and 80°C was measured. 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ was calculated.

[0102] Specifically, the loss tangent tanδ was measured at temperatures between 25 and 100°C, and the value at 30°C was used as the loss tangent tanδ at 30°C. 30℃ The value at 80°C is the loss tangent tanδ at 80°C. 80℃ and the ratio of these is tanδ 80℃ / tanδ 30℃ The loss tangent tanδ at 30°C was calculated. 30℃ , loss tangent tanδ at 80℃ 80℃ , and the ratio of these, tan δ 80℃ / tanδ 30℃ are shown in Table 1.

[0103] <Making a self-standing bag> A freestanding bag was made from the prepared composite film for forming a structure. Figure 2 shows the material cut out to make the freestanding bag, with Figure 2(a) being the body and Figure 2(b) being the bottom. Figure 3 shows the produced freestanding bag, with Figure 3(a) being a front view, Figure 3(b) being a side view, and Figure 3(c) being a bottom view.

[0104] In the production, first, the composite film for forming a structure 100 was cut out to produce a body portion having the dimensions shown in Fig. 2(a) and a bottom portion shown in Fig. 2(b). Next, the bottom portion was folded back along the dashed line, and the edge was heat-sealed to the body portion, and the periphery of the body portion was also heat-sealed to produce the self-standing bag shown in Fig. 3.

[0105] The dimensions of the produced self-standing bag were 135 mm high x 90 mm wide x 25 mm folded in. The width of the heat seal is shown in Figure 2(a) as heat seal part 1. A 15 mm wide opening 2 was provided in the center of the top end of the self-standing bag for filling or discharging the contents.

[0106] <Measurement of swelling thickness> Hot water at 80°C was filled into the bag through a 15mm wide opening, and the thickness of the body of the self-standing bag after filling was measured using a vernier caliper. The bag was then cooled to 30°C, the contents were then removed, and the thickness of the body of the self-standing bag after removal was measured. The measurement results and shape retention are shown in Table 1.

[0107] <Evaluation of independence> After cooling to 30°C and discharging the contents, the self-standing bag was evaluated for its ability to stand up according to the following criteria. The results are shown in Table 1. ○: After the contents are discharged, the self-standing bag stands up easily when placed down. △: After emptying the contents, the self-standing bag will stand upright if placed down with a little care. ×: After the contents are removed, the self-standing bag falls over immediately when placed down.

[0108] Example 2 <Preparation of composite film for structural formation> A composite film for forming a structure was produced so as to have the layering order shown in Table 1. The composite film for forming a structure produced in Example 2 has a structure that does not have an intermediate layer.

[0109] A low-density polyethylene (LDPE) adhesive layer was extruded and sandwiched between the PET-2 film substrate and the nonwoven fabric-1 core to produce a laminate consisting of the substrate layer and the core. The thickness of the LDPE layer was 20 μm.

[0110] A coating solution of an amorphous polyester resin emulsion having the same composition as in Example 1 was applied to the core material (nonwoven fabric-1) of the laminate consisting of the base layer / core material in a solid content of 2 g / m 2 A laminate consisting of a base material layer / functional material layer was produced by gravure coating.

[0111] The LL#50 film, which serves as the sealant layer, and the amorphous polyester resin-coated surface of the functional material layer of a laminate consisting of a base layer / functional material layer were dry-laminated with an adhesive to produce a composite film for forming a structure consisting of a base layer / functional material layer / sealant layer.

[0112] Dry lamination was performed using a two-component urethane adhesive (Rock Paint Co., Ltd.) Specifically, a mixture of 10 parts by weight of RU-50 as the adhesive base and 1 part by weight of H-4 as the curing agent was used.

[0113] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0114] Example 3 A composite film for forming a structure was produced so as to have the lamination order shown in Table 1. Specifically, the composite film for forming a structure was produced in the same manner as in Example 2, except that an Ny-1 film was used as the base layer instead of the PET-2 film.

[0115] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0116] Example 4 <Preparation of composite film for structural formation> A composite film for forming a structure was produced so as to have the layering order shown in Table 1. The composite film for forming a structure produced in Example 4 has a structure having an intermediate layer.

[0117] A low-density polyethylene (LDPE) adhesive layer was extruded and sandwiched between the PET-1 film substrate and the nonwoven fabric-2 core to produce a laminate consisting of the substrate layer and the core. The thickness of the LDPE layer was 20 μm.

[0118] Elitel (registered trademark) KA-1449, an amorphous polyester resin emulsion, was used as the coating liquid, and a solid content of 13.8 g / m was applied to the surface of the core material side of the laminate consisting of the base layer / core material. 2 A laminate consisting of a base material layer / functional material layer was produced by gravure coating.

[0119] A laminate consisting of a base material layer / / functional material layer was produced by dry laminating the functional material layer side of the laminate consisting of a base material layer / / functional material layer and an Ny-2 film, which serves as an intermediate layer, using an adhesive.

[0120] Next, the surface of the intermediate layer of the laminate consisting of the base material layer / / functional material layer / / intermediate layer was dry laminated with an LL#70 film, which would serve as the sealant layer, using an adhesive to produce a composite film for forming a structure.

[0121] The dry lamination in Example 4 was carried out using the same two-component urethane adhesive (Rock Paint Co., Ltd.) as in Example 2. Specifically, a mixture of 10 parts by weight of RU-50 as the adhesive base and 1 part by weight of H-4 as the curing agent was used.

[0122] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0123] Example 5 A composite film for structure formation was produced in the lamination order shown in Table 1. Specifically, Elitel (registered trademark) KT-9204 was used as the amorphous polyester resin emulsion instead of Elitel (registered trademark) KA-1449, and the nonwoven fabric-2 was coated with 12.9 g / m2 of solid content. 2 A composite film for forming a structure was produced in the same manner as in Example 4, except that gravure coating was performed so that the thickness of the film was as follows:

[0124] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0125] Example 6 A composite film for structure formation was prepared in the lamination order shown in Table 1. Specifically, Vylon (registered trademark) 600 was used as the amorphous polyester resin instead of Elitel (registered trademark) KA-1449, and a coating liquid was prepared by dissolving Vylon (registered trademark) 600 in ethyl acetate. The prepared coating liquid was applied to nonwoven fabric-2 in a solid content of 12.6 g / m. 2 A composite film for forming a structure was produced in the same manner as in Example 4, except that gravure coating was performed so that the thickness of the film was as follows:

[0126] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0127] 《Reference example 1》 <Preparation of composite film for structural formation> A structure-forming composite film was produced so as to have the layering order shown in Table 1. The structure-forming composite film produced in Reference Example 1 has a structure having an intermediate layer.

[0128] An adhesive layer of ethylene-methacrylic acid copolymer (EMAA) was extruded and sandwiched between the PET-1 film substrate and the nonwoven fabric-1 core to produce a laminate consisting of the substrate layer and the core. The thickness of the EMAA layer was 20 μm.

[0129] Polycaprolactone (PCL) was dissolved in toluene to prepare a coating solution, and the coating amount was 5 g / m2 on the core material (nonwoven fabric-1) of the laminate consisting of the base layer / core material. 2 A laminate consisting of a base material layer / functional material layer was produced by gravure coating.

[0130] An adhesive layer of ethylene-methacrylic acid copolymer (EMAA) was extruded and sandwiched between the functional material layer side of the laminate and the Ny-1 film that served as the intermediate layer to produce a laminate consisting of a base layer / functional material layer / intermediate layer. The thickness of the EMAA layer was set to 20 μm.

[0131] Next, an ethylene-methacrylic acid copolymer (EMAA) adhesive layer was extruded and sandwiched between the intermediate layer side of the laminate consisting of the base layer / functional material layer / intermediate layer and the LL#50 film sealant layer to produce a composite film for forming structures. The thickness of the ethylene-methacrylic acid copolymer (EMAA) layer was adjusted to 20 μm.

[0132] <Measurement of loss tangent tanδ> The loss tangent tanδ at 30°C and 80°C was measured for the prepared composite film for forming a structure in the same manner as in Example 1. 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of80℃ / tanδ 30℃ The results are shown in Table 1.

[0133] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0134] Comparative Example 1 <Preparation of composite film for structural formation> A structure-forming composite film was produced so as to have the layering order shown in Table 1. The structure-forming composite film produced in Comparative Example 1 has a structure in which no coating agent is applied to the functional material layer.

[0135] A laminate consisting of a base layer and a core material was prepared by dry laminating 75 g of paper onto a PET-1 film base layer. A two-component dry laminating adhesive (Takelac A525 / Takenate A52, Mitsui Chemicals, Inc.) was used as the dry laminating adhesive.

[0136] Next, a sealant layer (LL#50) was dry laminated onto the core side of the laminate consisting of the base layer / core material to prepare a composite film for forming a structure. The dry lamination adhesive used was a two-component curing dry lamination adhesive (Takelac A525 / Takenate A52, Mitsui Chemicals, Inc.).

[0137] <Measurement of loss tangent tanδ> The loss tangent tanδ at 30°C and 80°C was measured for the prepared composite film for forming a structure in the same manner as in Example 1. 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ The results are shown in Table 1.

[0138] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0139] Comparative Example 2 <Preparation of composite film for structural formation> A structure-forming composite film was produced so as to have the layering order shown in Table 1. The structure-forming composite film produced in Comparative Example 2 has a structure that does not have a functional material layer.

[0140] The VM-PET film was dry laminated onto the Ny-2 film as the base layer. A two-component dry lamination adhesive (Takelac A525 / Takenate A52, Mitsui Chemicals, Inc.) was used as the dry lamination adhesive.

[0141] Next, a sealant layer (LL#95) was applied by dry lamination to prepare a composite film for forming a structure. The dry lamination adhesive used was a two-component curing dry lamination adhesive (Takelac A525 / Takenate A52, Mitsui Chemicals, Inc.).

[0142] <Measurement of loss tangent tanδ> The loss tangent tanδ at 30°C and 80°C was measured for the prepared composite film for forming a structure in the same manner as in Example 1. 30℃ Loss tangent tanδ at 80℃ 80℃ tanδ is the ratio of 80℃ / tanδ 30℃ The results are shown in Table 1.

[0143] <Production and evaluation of self-standing bags> Using the produced structure-forming composite film, a self-standing bag was produced in the same manner as in Example 1, and the produced self-standing bag was measured and evaluated in the same manner as in Example 1. The results are shown in Table 1.

[0144] [Table 1] [Explanation of symbols]

[0145] 100 Composite film for structural formation 10 Base material layer 20 Functional material layer 21 Nonwoven fabric 22 Amorphous polyester 30 Sealant Layer 1 Heat seal section 2 Opening

Claims

1. a functional material layer and a sealant layer, The functional material layer is formed by impregnating or coating a core material with an amorphous polyester, and The amorphous polyester has a glass transition temperature or softening point of 30 to 80°C. Composite film for structural formation.

2. a functional material layer and a sealant layer, The functional material layer is formed by impregnating or coating a core material with an amorphous polyester, and the ratio of the loss tangent tanδ 80°C at 80°C to the loss tangent tanδ 30°C at 30°C, tanδ 80°C / tanδ 30°C, is 1.04 to 5.00; Composite film for structural formation.

3. The composite film for forming a structure according to claim 1 or 2, wherein the core material is a fiber structure.

4. 4. The composite film for forming a structure according to claim 3, wherein the fiber structure is at least one selected from the group consisting of paper, nonwoven fabric, and woven fabric.

5. 5. The structure-forming composite film according to claim 1, wherein the amorphous polyester is an aqueous dispersion of amorphous polyester.

6. 5. The structure-forming composite film according to claim 1, wherein the amorphous polyester is an amorphous polyester-containing solution.

7. The composite film for forming a structure according to any one of claims 1 to 6, further comprising a substrate layer.

8. The composite film for forming a structure according to claim 7 , wherein the base material layer, the functional material layer, and the sealant layer are laminated in this order.

9. A self-standing bag, at least a portion of which is made of the composite film for forming a structure according to any one of claims 1 to 8.

10. A self-standing bag, at least the body of which is made of the composite film for forming a structure according to any one of claims 1 to 8.

11. The self-standing bag according to claim 9 or 10, which is used in a hot filling method.

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