Film laminate

Abstract

As illustrated in FIG. 1, a film laminate (100) according to the present invention includes a transparent resin layer (110), an ultraviolet-curable adhesive layer (120), and a base material resin layer (130) in this order. The transparent resin layer (110) is composed of a polyolefin-based resin. The ultraviolet-curable adhesive layer (120) includes a cured product of an isocyanate and an ultraviolet-curable resin.

Description

Film laminate

[0001] The present invention relates to a film laminate.

[0002] Since the ultraviolet curable resin cures by causing a photochemical reaction with the energy of ultraviolet rays, it has characteristics such as quick drying, high film physical properties, and no solvent, and is used as an ultraviolet curable ink (UV ink) or an ultraviolet curable adhesive in a film laminate.

[0003] Film laminates having a cured product of an ultraviolet curable resin have various structures. In Patent Document 1, a laminate for a tube including a laminated surface layer, an adhesive layer, a UV ink layer, and a base material laminate is disclosed. The surface layer contains a polyolefin, the adhesive layer is formed of a two-component adhesive of a polyol having an ester moiety and a polyisocyanate, the surface of the base material laminate that contacts the UV ink layer is formed of a polyolefin, and the UV ink layer is disposed at a location corresponding to a seal portion on the surface of the base material laminate. According to the invention of Patent Document 1, the laminate strength is improved between the surface layer and the UV ink layer, so that cohesive delamination can be prevented and laminate lifting of the surface layer due to stress can be prevented.

[0004] Further, in Patent Document 2, in a method for manufacturing a tube container web, a printing layer is formed on a single-layer sheet made of a polyethylene layer or a multilayer sheet having a polyethylene layer on the surface using an ultraviolet curable ink, an ultraviolet curable adhesive is applied on the printing layer to form an ultraviolet curable adhesive layer, and then a polyethylene film is adhered to the sheet through the ultraviolet curable adhesive layer to form a protective layer for the printing layer. A method for manufacturing a tube container web is disclosed. According to the invention of Patent Document 2, a tube container web can be manufactured with a simple manufacturing method and a small number of manufacturing steps without requiring large-scale manufacturing equipment on the printing layer of the web.

[0005] International Publication No. 2014 / 178403, Japanese Patent Application Laid-Open No. 2015-136918

[0006] In Patent Document 1, when laminating a transparent resin layer onto a base resin layer, the base resin layer and the transparent resin layer are bonded using a two-component adhesive. However, because an aging time is required to cure the two-component adhesive, productivity is reduced.

[0007] On the other hand, Patent Document 2 describes a method in which the base resin layer and the transparent resin layer are bonded together using an ultraviolet-curing adhesive, thus enabling lamination without requiring an aging time. However, ultraviolet-curing adhesives may have inferior adhesive strength compared to two-component adhesives.

[0008] Therefore, the present invention aims to provide a film laminate having high lamination strength and high productivity.

[0009] The present inventors, after diligent study, have found that the above problems can be solved by the following means, and have completed the present invention. <Aspect 1> A film laminate having a transparent resin layer, an ultraviolet-curable adhesive layer, and a base resin layer in this order, wherein the transparent resin layer is composed of a polyolefin resin, and the adhesive layer has cured products of isocyanate and ultraviolet-curable resin. <Aspect 2> The laminate according to Aspect 1, wherein the wetting tension of the surface of the transparent resin layer on the side in contact with the adhesive layer is 36 mN / m or more. <Aspect 3> The laminate according to Aspect 1 or 2, wherein the wetting tension of the surface of the base resin layer on the side in contact with the adhesive layer is 36 mN / m or more. <Aspect 4> The laminate according to any one of Aspects 1 to 3, wherein the lamination strength of the film laminate is 3.0 N / 15 mm or more. <Aspect 5> The laminate according to any one of Aspects 1 to 4, wherein the transparent resin layer is an outer sealant layer. <Aspect 6> The laminate according to any one of aspects 1 to 5, wherein the UV-curable resin is an acrylic resin. <Aspect 7> The laminate according to any one of aspects 1 to 6, wherein the isocyanate is a polyisocyanate. <Aspect 8> The laminate according to any one of aspects 1 to 7, which is a laminate for a laminate tube container. <Aspect 9> A laminate tube container having the laminate according to aspect 8.

[0010] According to the present invention, it is possible to provide a film laminate having high lamination strength and high productivity.

[0011] Figure 1 is a side cross-sectional view of one embodiment of the film laminate of the present invention.

[0012] A film laminate comprising a transparent resin layer, an ultraviolet-curable adhesive layer, and a base resin layer in that order, wherein the transparent resin layer is composed of a polyolefin resin, and the adhesive layer has cured products of isocyanate and ultraviolet-curable resin.

[0013] According to the present invention, it is possible to provide a film laminate having high lamination strength and high productivity.

[0014] The inventors have found that when a transparent resin layer and a base resin layer are bonded together using an ultraviolet-curable adhesive layer, the adhesive strength between the transparent resin layer and the ultraviolet-curable adhesive layer is low.

[0015] In contrast, the present inventors have found that when the transparent resin layer is composed of a polyolefin resin and the UV-curable adhesive layer has cured isocyanate and UV-curable resin, the adhesive strength between the transparent resin layer and the UV-curable adhesive layer is increased, and the laminate strength of the film laminate is increased. Although not limited to theory, this is thought to be because the resin constituting the transparent resin layer has hydroxyl groups, and these hydroxyl groups react with the isocyanate in the UV-curable adhesive layer and harden, thereby increasing the adhesive strength. Furthermore, since polyolefin resins have a high UV transmittance, even when UV light is irradiated onto the UV-curable resin through the transparent resin layer to form the UV-curable adhesive layer, the UV-curable adhesive layer is sufficiently hardened, and the adhesive strength is thought to be further increased.

[0016] Specifically, as shown in Figure 1, the film laminate 100 has a transparent resin layer 110, an ultraviolet-curable adhesive layer 120, and a base resin layer 130 in that order. Here, the ultraviolet-curable adhesive layer 120 has isocyanate and a cured product of ultraviolet-curable resin. It is thought that the hydroxyl groups of the resin constituting the transparent resin layer 110 and the isocyanate of the ultraviolet-curable adhesive layer 120 bond together to form a urethane bond, thereby increasing the adhesive strength between the transparent resin layer 110 and the ultraviolet-curable adhesive layer 120.

[0017] The following describes each component of the present invention.

[0018] The film laminate of the present invention comprises a transparent resin layer, an ultraviolet-curable adhesive layer, and a base resin layer in this order.

[0019] The lamination strength of the film laminate is preferably 3.0 N / 15 mm or more, 4.0 N / 15 mm or more, 5.0 N / 15 mm or more, 7.0 N / 15 mm or more, or 10.0 N / 15 mm or more. Alternatively, the lamination strength may be 30.0 N / 15 mm or less, 25.0 N / 15 mm or less, 20.0 N / 15 mm or less, or 18.0 N / 15 mm or less.

[0020] In this specification, "laminate strength" refers to the force required when a test piece is cut from the prepared film laminate to a width of 15 mm and a length of 100 mm, a certain amount of the transparent resin layer is peeled off, and the peeled transparent resin layer and the base resin layer are pinched together using a Strograph (manufactured by Toyo Seiki Seisakusho, VGF) and peeled off at a 90-degree angle in the longitudinal direction.

[0021] <Transparent Resin Layer> The transparent resin layer is made of a polyolefin resin. The function of the transparent resin layer is not particularly limited; for example, for the purpose of forming a laminate tube, the transparent resin layer may be an outer sealant layer.

[0022] As the polyolefin resin, for example, polyethylene resins and polypropylene resins can be used. When the transparent resin layer is the outer sealant layer, it is preferable that the transparent resin layer is made of polyethylene resin.

[0023] In this specification, polyethylene resins are resins containing more than 50 mol%, 60 mol%, 70 mol%, or 80 mol% of repeating ethylene groups in the main chain of the polymer, and are selected from the group consisting of, for example, low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), medium-density polyethylene (MDPE), high-density polyethylene (HDPE), ethylene-acrylic acid copolymer (EAA), ethylene-methacrylic acid copolymer (EMAA), ethylene-ethyl acrylate copolymer (EEA), ethylene-methyl acrylate copolymer (EMA), and derivatives thereof, as well as mixtures thereof.

[0024] In this specification, polypropylene resins are resins that contain more than 50 mol%, 60 mol%, 70 mol%, or 80 mol% of repeating propylene groups in the main chain of the polymer, and include, for example, polypropylene (PP) homopolymers, random polypropylene (random PP), blocked polypropylene (block PP), chlorinated polypropylene, acid-modified polypropylene, and derivatives thereof, as well as mixtures thereof.

[0025] The wetting tension of the surface of the transparent resin layer that is in contact with the UV-curable adhesive layer may be 36 mN or higher. The higher the wetting tension, the more hydroxyl groups the adhesive surface of the transparent resin layer has, and the stronger the adhesion to the UV-curable adhesive layer. Here, the wetting tension can be adjusted by modifying the adhesive surface of the transparent resin layer by, for example, corona discharge radiation, plasma treatment, flame treatment, etc. The wetting tension may be 37 mN / m or higher, 38 mN / m or higher, 39 mN / m or higher, or 40 mN / m or higher, and may be 60 mN / m or lower, 55 mN / m or lower, 52 mN / m or lower, 50 mN / m or lower, 48 mN / m or lower, or 46 mN / m or lower.

[0026] Wetting tension can be determined by preparing a test piece of transparent resin layer, applying a wetting tension test mixture to the adhesive surface according to JIS-K-6768, and observing the shape of the applied liquid film.

[0027] The thickness of the transparent resin layer is not particularly limited, but from the viewpoint of ensuring strength, it is preferable that it is, for example, 30 μm or more, 50 μm or more, 60 μm or more, 70 μm or more, or 80 μm or more. Furthermore, from the viewpoint of improving the handling of the film laminate, it is preferable that it is 200 μm or less, 190 μm or less, 180 μm or less, 170 μm or less, 160 μm or less, 150 μm or less, 140 μm or less, 130 μm or less, 125 μm or less, 120 μm or less, 115 μm or less, 110 μm or less, or 105 μm or less.

[0028] <UV-curing adhesive layer> The UV-curing adhesive layer is a layer that adheres the transparent resin layer to the substrate resin layer.

[0029] The UV-curable adhesive layer has cured products of isocyanate and UV-curable resin.

[0030] In this specification, "cured product of isocyanate and UV-curable resin" refers to the cured product produced by irradiating a mixture of isocyanate and UV-curable resin with ultraviolet light, causing a photochemical reaction of the UV-curable resin. Here, it is believed that the isocyanate forms urethane bonds by bonding with the hydroxyl groups of the resins constituting the transparent resin layer and the UV-curable adhesive layer. In other words, the resins are crosslinked by urethane bonds due to the isocyanate. Then, the intermolecular forces in the urethane bonds (e.g., hydrogen bonds) improve the laminate strength and the strength of the resin itself.

[0031] In this specification, "ultraviolet-curable resin" means a resin that has the property of hardening when irradiated with ultraviolet light, that is, a resin before curing.

[0032] The UV-curing resin may be an acrylic resin. The acrylic resin is not particularly limited, but for example, polyurethane acrylate, epoxy acrylate, acrylic resin acrylate, and polyester acrylate can be used.

[0033] Examples of polyurethane acrylates that can be used include aromatic polyurethane acrylates and aliphatic polyurethane acrylates.

[0034] In this specification, "aromatic polyurethane acrylate" refers to polyurethane acrylate having a benzene ring, and "aliphatic polyurethane acrylate" refers to polyurethane acrylate not having a benzene ring.

[0035] In this specification, "isocyanate" means a compound having at least one isocyanate group.

[0036] The isocyanate may be a polyisocyanate. In this specification, "polyisocyanate" means a compound having at least two isocyanate groups. The polyisocyanate may be, for example, an aliphatic polyisocyanate or an aromatic polyisocyanate.

[0037] Examples of aliphatic polyisocyanates include trimethylene diisocyanate, tetramethylene diisocyanate, hexamethylene diisocyanate, pentamethylene diisocyanate, 1,2-propylene diisocyanate, 1,2-butylene diisocyanate, 2,3-butylene diisocyanate, 1,3-butylene diisocyanate, 2,4,4- or 2,2,4-trimethylhexamethylene diisocyanate, dimer acid diisocyanate, and 2,6-diisocyanatohexanoate. Examples include aliphatic diisocyanates such as 2-isocyanatoethyl 2,6-diisocyanatohexanoate, 1,6-diisocyanato-3-isocyanatomethylhexane, 1,4,8-triisocyanatooctane, 1,6,11-triisocyanatoundecane, 1,8-diisocyanato-4-isocyanatomethyloctane, 1,3,6-triisocyanatohexane, and 2,5,7-trimethyl-1,8-diisocyanato-5-isocyanatomethyloctane.

[0038] Examples of aromatic polyisocyanates include aromatic diisocyanates such as m-phenylenediisocyanate, p-phenylenediisocyanate, 4,4'-diphenyldiisocyanate, 1,5-naphthalenediisocyanate, 2,4-tolylenediisocyanate or 2,6-tolylenediisocyanate, 4,4'-toluidinediisocyanate, and 4,4'-diphenyletherdiisocyanate; aromatic triisocyanates such as triphenylmethane-4,4',4''-triisocyanate, 1,3,5-triisocyanatobenzene, and 2,4,6-triisocyanatotoluene; and aromatic tetraisocyanates such as 4,4'-diphenylmethane-2,2',5,5'-tetraisocyanate.

[0039] The amount of the additive containing isocyanate is not particularly limited and may be any amount that can enhance the adhesion between the transparent resin layer and the UV-curable adhesive layer. For example, the amount of the additive containing isocyanate may be 1% by mass or more, 2% by mass or more, 3% by mass or more, 4% by mass or more, 5% by mass or more, 6% by mass or more, 7% by mass or more, or 8% by mass or more relative to the UV-curable adhesive layer, or it may be 30% by mass or less, 25% by mass or less, or 20% by mass or less.

[0040] The isocyanate content of the additive containing isocyanate is not particularly limited and may be, for example, 1% or more by mass, 10% or more by mass, 30% or more by mass, or 50% or more by mass, relative to the mass of the additive containing isocyanate, and may also be 100% or less by mass, 80% or less by mass, or 60% or less by mass.

[0041] The thickness of the UV-curable adhesive layer is not particularly limited, but from the viewpoint of ensuring strength, it is preferable that it is, for example, 0.5 μm or more, 1.0 μm or more, 1.5 μm or more, or 2.0 μm or more. Furthermore, from the viewpoint of improving the handling of the film laminate, it is preferable that the thickness of the UV-curable adhesive layer is 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, 15 μm or less, or 12 μm or less.

[0042] <Substrate Resin Layer>The substrate resin layer is a non - permeable substrate with an ultraviolet - curable adhesive layer laminated on its surface. The substrate resin layer has resin at least in part. The substrate layer may be a single layer or a laminate in which a plurality of layers are laminated, and may include a plurality of layers of the same type.

[0043] The wetting tension of the surface of the substrate resin layer on the side in contact with the ultraviolet - curable adhesive layer may be 36 mN or more. The greater the wetting tension, the more hydroxyl groups the adhesive surface of the substrate resin layer has, and the higher the adhesive force with the ultraviolet - curable adhesive layer. Here, the wetting tension can be adjusted, for example, by subjecting the adhesive surface of the substrate resin layer to corona discharge radiation, plasma treatment, frame treatment, etc. for modification. The wetting tension may be 37 mN / m or more, 38 mN / m or more, 39 mN / m or more, or 40 mN / m or more, and may also be 60 mN / m or less, 55 mN / m or less, 52 mN / m or less, 50 mN / m or less, 48 mN / m or less, or 46 mN / m or less.

[0044] The wetting tension can be determined by preparing a test piece of the substrate resin layer, applying a wetting - tension test mixture to the adhesive surface in accordance with JIS - K - 6768, and judging from the shape of the applied liquid film.

[0045] The substrate resin layer may have, for example, a printing layer, a printed layer, a barrier layer, a reinforcing layer, and an inner sealant layer. These layers may be laminated by any optional lamination means.

[0046] (Printing Layer) The printing layer is not particularly limited. For example, when laminated by flexographic printing, it may be a low - viscosity and fast - drying flexographic ink.

[0047] (Printed Layer) The printed layer is not particularly limited as long as it has a non - permeable property to the extent that the printing layer can be printed. For example, it may be a resin layer.

[0048] As the printable layer, thermoplastic resins such as polyolefin resins, vinyl polymers, polyesters, and polyamides can be used individually or in combination of two or more types in a multilayer structure. Such thermoplastic resins can be used in the form of a film or an extruded resin. Furthermore, the film may be a stretched film or an unstretched film.

[0049] Examples of polyolefin resins that can be used include polyethylene resins and polypropylene resins. For details regarding polyolefin resins, please refer to the description of the transparent resin layer above.

[0050] Examples of vinyl polymers include polyvinyl chloride (PVC).

[0051] Examples of polyesters include polyethylene terephthalate (PET) and polybutylene terephthalate.

[0052] Examples of polyamides include nylons such as nylon (registered trademark) 6 and nylon MXD6.

[0053] (Barrier layer) As the barrier layer, for example, an inorganic vapor deposition layer, a metal foil layer, an organic coating layer, etc., can be used.

[0054] Examples of inorganic vapor-deposited layers include silica vapor-deposited films, aluminum vapor-deposited films, alumina vapor-deposited films, and silica-alumina vapor-deposited films.

[0055] As the metal foil layer, for example, single metal foils such as aluminum foil, copper foil, and titanium foil, or alloy foils such as aluminum alloy foil and stainless steel foil can be used.

[0056] For example, a vinylidene chloride coating layer or a polyvinylidene fluoride coating layer can be used as the organic coating layer.

[0057] When an inorganic vapor-deposited film or an organic coating layer is used as the barrier layer, the thickness of the barrier layer is preferably 100 nm or more, 200 nm or more, 300 nm or more, 500 nm or more, 700 nm or more, or 1 μm or more from the viewpoint of ensuring strength and barrier properties, and is preferably 5 μm or less, 4 μm or less, 3 μm or less, or 2 μm or less from the viewpoint of improving the handlingability of the film laminate.

[0058] When a metal foil layer is used as the barrier layer, the thickness of the barrier layer is preferably 3 μm or more, 5 μm or more, 7 μm or more, 10 μm or more, or 15 μm or more from the viewpoint of ensuring strength and barrier properties. Furthermore, a thickness of 100 μm or less, 80 μm or less, 60 μm or less, 55 μm or less, 50 μm or less, 45 μm or less, 40 μm or less, or 35 μm or less is preferable from the viewpoint of improving the handlingability of the film laminate.

[0059] (Reinforcement layer) The reinforcement layer may be a layer made of stretched film.

[0060] The reinforcing layer may be a stretched film composed of, for example, a polyolefin resin, a polyamide resin, etc. For polyolefin resins and polyamide resins, refer to the description of the printed layer above.

[0061] If the reinforcing layer is composed of a stretched film, the stretched film constituting the reinforcing layer may be a stretched film obtained, for example, by flat stretching, and may be a uniaxially stretched film or a biaxially stretched film. The biaxially stretched film may be a sequentially stretched biaxially stretched film or a simultaneously stretched biaxially stretched film, or a stretched film obtained by performing these stretching operations multiple times.

[0062] From the viewpoint of ensuring strength, the thickness of the reinforcing layer is preferably 5 μm or more, 7 μm or more, 10 μm or more, 12 μm or more, or 25 μm or more. Furthermore, from the viewpoint of not making the total thickness of the film laminate excessively large, the thickness of the reinforcing layer is preferably 50 μm or less, 40 μm or less, 30 μm or less, 20 μm or less, 15 μm or less, or 12 μm or less.

[0063] (Inner sealant layer) The inner sealant layer may be made of polyethylene resin. For polyethylene resins, refer to the description of the transparent resin layer above.

[0064] The thickness of the inner sealant layer is not particularly limited, but from the viewpoint of ensuring strength, it is preferable that it is, for example, 50 μm or more, 60 μm or more, 70 μm or more, 80 μm or more, 85 μm or more, 90 μm or more, or 95 μm or more. Furthermore, from the viewpoint of improving the handling of the film laminate, it is preferable that it is 200 μm or less, 190 μm or less, 180 μm or less, 170 μm or less, 160 μm or less, 150 μm or less, 140 μm or less, 130 μm or less, 125 μm or less, 120 μm or less, 115 μm or less, 110 μm or less, or 105 μm or less.

[0065] <Method for Manufacturing Film Laminates> The method for manufacturing film laminates is not particularly limited and may include, for example, a lamination step of laminating an ultraviolet-curable adhesive layer and a transparent resin layer onto a base resin layer. For details on film laminates, refer to the above description of film laminates.

[0066] In the lamination process, after the printing process, an adhesive containing an ultraviolet-curable resin and isocyanate may be applied to the surface of the base resin layer, and a transparent resin layer may be further laminated on the adhesive. By irradiating the surface of the transparent resin layer with ultraviolet light, the ultraviolet-curable resin may be cured to form an ultraviolet-curable adhesive layer and a transparent resin layer.

[0067] It is preferable to improve the wetting tension of the adhesive surface of the transparent resin layer before lamination by corona discharge irradiation or the like.

[0068] The UV-curing resin and adhesive containing isocyanate are not particularly limited, and may, for example, be a generally known UV-curing adhesive to which an isocyanate-containing additive has been added to make it contain isocyanate.

[0069] The method of applying the adhesive is not particularly limited and may include, for example, flexographic printing.

[0070] The amount of ultraviolet radiation is, for example, 25 mJ / cm².２ Above, 30mJ / cm ２ 35 mJ / cm ２ , or 40 mJ / cm ２ The above is preferable from the viewpoint of ensuring the strength of the UV-curable adhesive layer.

[0071] 《Laminate for Laminate Tube Containers》 The film laminate of the present invention may also be a laminate for laminate tube containers.

[0072] According to the present invention, it is possible to provide a laminate for laminate tube containers that has high lamination strength and high productivity.

[0073] When the film laminate of the present invention is applied to a laminate for a laminate tube container, the transparent resin layer has an outer sealant layer, and the base resin layer has an inner sealant layer. The cylindrical body of the laminate tube container can be manufactured by heat-sealing a portion of the outer sealant layer and the inner sealant layer (side seam portion).

[0074] Laminated Tube Container The laminated tube container has a laminate for laminated tube containers according to the present invention.

[0075] According to the present invention, it is possible to provide a laminate tube container having high lamination strength and high productivity.

[0076] The laminate tube container of the present invention may have a head portion having a shoulder portion and a cap portion, and a tail seal portion located on the opposite side of the head portion.

[0077] Laminated tube containers can be filled with contents such as pharmaceuticals, cosmetics, and food. Examples of contents include toothpaste, moisturizing cream, and sunscreen.

[0078] Laminated tube containers can be manufactured by a method including, for example, the following steps: forming a side seam by forming a body portion by overlapping and heat-sealing the ends of a laminated tube while rolling it so that the base material, particularly the sealant layer of the base material, is on the inside; and attaching a head portion having a shoulder portion and a cap portion to the periphery of the opening of the body portion to obtain a laminated tube container.

[0079] The present invention will be specifically described by examples and comparative examples, but the present invention is not limited thereto.

[0080] 《Preparation of Film Laminates》 A base resin layer, whose surface layer is composed of polyolefin resin, was coated with an ultraviolet-curable resin (Daido Chemical Co., Ltd., SCK-16D) containing an isocyanate additive (Toyo Ink Co., Ltd., FDSS additive) as shown in Table 1, using an anilox roll to achieve a film thickness of 0.5 to 3 μm. A transparent resin layer of LLDPE film (80 μm), polyethylene terephthalate (PET) film (Toyobo Co., Ltd., E5100), or PET film (Annex Co., Ltd., G2000) was then laminated to the thickness shown in Table 1. The ultraviolet-curable resin was cured by irradiating it with ultraviolet light from the transparent resin layer side, thereby producing the film laminates of Examples 1 to 3 and Comparative Examples 1 to 3. In all cases, the surface of the transparent resin layer that is in contact with the ultraviolet-curable adhesive layer is a corona-treated surface.

[0081] 《Evaluation of Lamination Strength of Film Laminates》 The film laminates of Examples 1-3 and Comparative Examples 1-3 were cut into 15 mm wide x 100 mm long test pieces. A certain amount of the transparent resin layer was peeled off, and the force required to pinch the peeled transparent resin layer and the base resin layer and peel them 90 degrees in the length direction was measured and evaluated using a Strograph (VGF, manufactured by Toyo Seiki Seisakusho). The evaluation results are shown in Table 1.

[0082]

[0083] From Examples 1-3 and Comparative Examples 1-2 in Table 1, it can be seen that by composing the transparent resin layer with a polyolefin resin, the adhesion between the transparent resin layer and the UV-curable adhesive layer is enhanced, and the film laminate has high lamination strength.

[0084] From Examples 1 to 3 and Comparative Example 3 in Table 1, it can be seen that the presence of isocyanate and cured products of UV-curable resin in the UV-curable adhesive layer enhances the adhesion between the transparent resin layer and the UV-curable adhesive layer, resulting in a film laminate with high lamination strength.

[0085] 100 Film laminate 110 Transparent resin layer 120 UV-curable adhesive layer 130 Base resin layer

Claims

1. A film laminate comprising a transparent resin layer, an ultraviolet-curable adhesive layer, and a base resin layer in that order, wherein the transparent resin layer is composed of a polyolefin resin, and the adhesive layer has cured products of isocyanate and ultraviolet-curable resin.

2. The laminate according to claim 1, wherein the wetting tension of the surface of the transparent resin layer that is in contact with the adhesive layer is 36 mN / m or more.

3. The laminate according to claim 1 or 2, wherein the wetting tension of the surface of the base resin layer that is in contact with the adhesive layer is 36 mN / m or more.

4. The laminate according to any one of claims 1 to 3, wherein the lamination strength of the film laminate is 3.0 N / 15 mm or more.

5. The laminate according to any one of claims 1 to 4, wherein the transparent resin layer is an outer sealant layer.

6. The laminate according to any one of claims 1 to 5, wherein the ultraviolet-curable resin is an acrylic resin.

7. The laminate according to any one of claims 1 to 6, wherein the isocyanate is a polyisocyanate.

8. The laminate according to any one of claims 1 to 7, which is a laminate for a laminate tube container.

9. A laminate tube container having the laminate described in claim 8.

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