Laminate film for corrosion protection and corrosion protection tape

Abstract

To provide a laminate film for corrosion protection and a corrosion protection tape which are excellent in workability, weatherability, waterproofness, and long-term durability.SOLUTION: The laminated film for corrosion protection includes a metal foil and an ultraviolet shielding layer containing one or both of carbon black and titanium oxide. The average UV transmissivity of the UV shielding layer at wavelengths from 250nm to 350nm is 50% or less. The anticorrosive tape has an adhesive layer on one surface of the anticorrosive laminate film.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a waterproofing material or a corrosion-preventing material for steel materials used in civil engineering and construction, and more particularly to a weather-resistant and waterproof anticorrosion laminate film and anticorrosion tape that can maintain waterproofing and corrosion-preventing properties for long periods of time in indoor and outdoor buildings and that are applied to the surface of steel materials used as components of structures, etc. More specifically, the present invention relates to a weather-resistant, waterproof, and anticorrosion laminate film and an anticorrosion tape that use this anticorrosion laminate film, which are suitable for preventing corrosion of steel materials used in various structures such as buildings, marine structures, steel towers, elevated water tanks, tanks, water gates, bridges, and plants. [Background technology]

[0002] Various types of steel are used as components for buildings, marine structures, steel towers, elevated water tanks, tanks, water gates, bridges, plants, etc., and their strength, corrosion resistance, heat resistance, magnetic properties, thermal expansion coefficient, etc. are adjusted by the carbon content and heat treatment method depending on the application and purpose.

[0003] If such steel materials are left as they are indoors or outdoors, they will corrode and develop red rust or yellowish-brown floating rust, which not only mars the scenery but also reduces the strength of the structure due to a decrease in thickness caused by corrosion, and in severe cases may even lead to damage.

[0004] Conventionally, as a countermeasure against corrosion of such steel materials over time, it has been common to apply a coating that has anti-corrosion or anti-rust properties, as disclosed in Patent Document 1.

[0005] On the other hand, Patent Documents 2 and 3 propose imparting corrosion resistance by attaching a waterproof film made of a resin layer or a metal layer to the surface of a steel material via an adhesive layer.

[0006] For example, Patent Document 2 describes a waterproof adhesive tape in which an adhesive layer whose main component is natural rubber, styrene-butadiene rubber, butyl rubber, or acrylic rubber is applied to a substrate made of a material with low water permeability, such as a rubber material such as butyl rubber, or a resin material such as acrylic, silicone, polyethylene, epoxy, or urethane.The waterproof adhesive tape preferably has a film thickness of 0.1 to 2.0 mm, an adhesive strength of 1 kg·cm or more, and a water absorption rate of 1.0% or less.

[0007] Patent Document 3 describes a method for protecting steel from corrosion by applying an adhesive to the surface of the steel material and attaching a resin sheet having a fiber layer or metal layer arranged inside or on the surface of a resin layer made of polyvinyl chloride that provides elasticity.

[0008] Patent Document 4 describes a heavy-duty corrosion-protective coated steel material having a vapor-deposited base film layer on which an inorganic substance is vapor-deposited.

[0009] Patent Document 5 describes a steel material repair method that includes a step of applying metal foil to the surface of the steel material so as to cover the corroded portion. [Prior art documents] [Patent documents]

[0010] [Patent Document 1] Japanese Patent Application Laid-Open No. 2004-97945 [Patent Document 2] Japanese Patent Application Laid-Open No. 2001-81800 [Patent Document 3] Japanese Patent Application Laid-Open No. 2013-71267 [Patent Document 4] Japanese Patent Application Laid-Open No. 2005-262787 [Patent Document 5] Japanese Patent Application Publication No. 2020-33730 Summary of the Invention [Problem to be solved by the invention]

[0011] The corrosion prevention method using paint, such as that described in Patent Document 1, does not provide sufficient corrosion prevention effects, and there are problems in that corrosion is likely to progress in places where moisture is likely to accumulate, places where salt is likely to adhere, and corners where the paint film is likely to thin. There are also problems in that the painting cost is high, the service life is limited, and maintenance costs are high due to the need for regular repainting.

[0012] In the method of Patent Documents 2 and 3, in which a waterproof film made of a resin layer or a metal layer is attached to the surface of a steel material via an adhesive layer, the corrosion prevention effect can be enhanced by selecting the resin layer or metal layer, but when used outdoors, there is a problem that pinholes and cracks are likely to occur when sand, pebbles, etc. collide with the film surface due to wind and rain, and the corrosion prevention properties cannot be maintained for a long period of time. If the metal layer is made thicker to prevent pinholes and cracks, the sheet becomes harder, causing problems with application to steel materials. Furthermore, waterproof resin sheets used as film substrates have poor adhesion to paints and adhesives, leading to peeling problems. In addition, the resin deteriorates due to ultraviolet and infrared rays, making it impossible to maintain waterproof properties over the long term and sometimes compromising corrosion resistance.

[0013] The heavy-duty corrosion-resistant coated steel material having an inorganic vapor-deposited base film layer described in Patent Document 4 has improved moisture barrier properties and increased durability compared to resin films, but is prone to pinholes and cracks and is insufficient for maintaining corrosion resistance over a long period of time.In addition, the resin deteriorates due to ultraviolet and infrared rays, making it impossible to maintain waterproof properties over a long period of time, and the film strength is insufficient, making it susceptible to breakage due to external forces.

[0014] In the method of applying a metal foil to cover a corroded portion of a steel surface as described in Patent Document 5, a thin metal foil has insufficient strength and is susceptible to breakage due to external force.Thick metal foil increases strength, but is too hard, resulting in problems with handling and application, and limiting the scope of application.

[0015] As described above, various corrosion prevention methods and various corrosion prevention films have been proposed in the past to impart corrosion resistance to steel materials. However, all of these methods have insufficient long-term weather resistance and water resistance, and as a result, the corrosion prevention properties of steel materials cannot be maintained for long periods of time due to deterioration of the corrosion prevention film itself over time, resulting in the problem that maintenance is required every time the steel material corrodes. Furthermore, when small stones or other debris hits the steel due to wind and rain, pinholes and cracks are formed, impairing the barrier properties and making the steel more susceptible to corrosion.

[0016] The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an anticorrosion laminate film and an anticorrosion tape that are easy to apply, and have excellent weather resistance, waterproofness, and long-term durability. [Means for solving the problem]

[0017] As a result of extensive research into the above-mentioned problems, the present inventors have found that the above-mentioned problems can be easily solved by employing a specific configuration, and have thus completed the present invention.

[0018] That is, the present invention is summarized as follows.

[0019] [1] A corrosion-resistant laminate film comprising a metal foil and an ultraviolet light-shielding layer containing one or both of carbon black and titanium oxide.

[0020] [2] A corrosion-preventing laminate film comprising a metal foil and an ultraviolet ray-shielding layer, the ultraviolet ray-shielding layer having an average ultraviolet ray transmittance of 50% or less for wavelengths of 250 nm or more and 350 nm or less.

[0021] [3] The anticorrosion laminate film according to [1] or [2], wherein the ultraviolet light-shielding layer is a layer containing a resin.

[0022] [4] The anticorrosion laminate film according to any one of [1] to [3], wherein the ultraviolet ray shielding layer contains carbon black, and the content of the carbon black is 0.05% by mass or more and 10% by mass or less relative to the ultraviolet ray shielding layer.

[0023] [5] The anticorrosion laminate film according to any one of [1] to [4], wherein the ultraviolet ray shielding layer contains titanium oxide, and the titanium oxide content is 0.3 mass % or more and 20 mass % or less relative to the ultraviolet ray shielding layer.

[0024] [6] The anticorrosion laminate film according to any one of [1] to [5], which has an adhesive layer made of a thermoplastic resin between the metal foil and the ultraviolet light-shielding layer.

[0025] [7] The anticorrosion laminate film according to any one of [1] to [6], wherein the thickness of the ultraviolet ray shielding layer is 10 μm or more and 100 μm or less.

[0026] [8] The anticorrosion laminate film according to [6] or [7], wherein one or both of the ultraviolet light-shielding layer and the adhesive layer contains a light stabilizer.

[0027] [9] The anticorrosion laminate film according to any one of [1] or [3] to [8], wherein the surface of the titanium oxide has a radical generation control coating.

[0028]

[10] The anticorrosion laminate film according to [8] or [9], wherein the light stabilizer is a polymeric hindered amine light stabilizer.

[0029]

[11] The anticorrosion laminate film according to any one of [1] to

[10] , wherein the metal foil is an aluminum foil or a SUS foil.

[0030]

[12] The anticorrosion laminate film according to any one of [1] to

[11] , wherein the metal foil has a thickness of 6 μm or more and 100 μm or less.

[0031]

[13] The anticorrosion laminate film according to

[11] or

[12] , wherein the iron content of the aluminum foil is 0.3 mass % or more and 1.7 mass % or less.

[0032]

[14] The anticorrosion laminate film according to any one of [1] or [3] to

[13] , wherein the ultraviolet ray shielding layer has an average ultraviolet ray transmittance of 50% or less at a wavelength of 250 nm or more and 350 nm or less.

[0033]

[15] An anticorrosion tape comprising the anticorrosion laminate film according to any one of [1] to

[14] and an adhesive layer provided on one surface of the anticorrosion laminate film.

[0034]

[16] The corrosion-protective tape according to

[15] , wherein the adhesive layer is a moisture-curable adhesive layer.

[0035]

[17] The anticorrosion tape according to

[15] , wherein the adhesive layer is an adhesive layer made of an acrylic foam or nonwoven fabric substrate including an acrylic adhesive layer.

[0036]

[18] The anticorrosion tape according to

[17] , wherein the adhesive layer is a double-sided tape.

[0037]

[19] The anticorrosion tape according to any one of

[15] to

[18] , wherein the ultraviolet ray blocking layer is disposed on the surface opposite to the adhesive layer. [Effects of the Invention]

[0038] According to the present invention, there are provided anticorrosion laminate films and anticorrosion tapes which are easy to apply, have excellent weather resistance, waterproofing properties and long-term durability, and can be produced inexpensively by a method which places little strain on the environment. The anticorrosion laminate film and anticorrosion tape of the present invention, which have excellent weather resistance and waterproofing properties, can be used to prevent rust and deterioration of steel materials at low cost and effectively over the long term, thereby improving the long-term durability and reliability of steel materials used in various outdoor structures in particular. [Brief explanation of the drawings]

[0039] [Figure 1] 1 is a schematic cross-sectional view showing an example of an embodiment of the anticorrosion laminate film and anticorrosion tape of the present invention. [Figure 2] FIG. 2 is a schematic cross-sectional view showing another example of an embodiment of the anticorrosion laminate film and anticorrosion tape of the present invention. [Figure 3] FIG. 2 is a schematic cross-sectional view showing another example of an embodiment of the anticorrosion laminate film and anticorrosion tape of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0040] Hereinafter, embodiments of the present invention will be described in detail with reference to Figures 1 to 3 showing examples of embodiments of the anticorrosion laminate film and anticorrosion tape of the present invention, but the present invention is not limited to the following embodiments.

[0041] [Anti-corrosion laminate film] The anticorrosion laminate film according to one embodiment of the present invention is an anticorrosion laminate film comprising a metal foil and an ultraviolet ray shielding layer (hereinafter sometimes referred to as "ultraviolet ray shielding layer I") containing one or both of carbon black and titanium oxide. Another embodiment of the anticorrosion laminate film of the present invention comprises a metal foil and an ultraviolet ray-shielding layer, and the ultraviolet ray-shielding layer (hereinafter sometimes referred to as "ultraviolet ray-shielding layer II") has an average ultraviolet ray transmittance of 50% or less for wavelengths of 250 nm or more and 350 nm or less. Hereinafter, the "ultraviolet ray shielding layer I" and the "ultraviolet ray shielding layer II" may be collectively referred to as the "ultraviolet ray shielding layer of the present invention." In the present invention, the average transmittance of the ultraviolet light-shielding layer for wavelengths of 250 nm or more and 350 nm or less is measured by the method described in the Examples section below.

[0042] In the anticorrosion laminate film of the present invention, the ultraviolet ray-shielding layer of the present invention is provided on one side of the metal foil as at least one outermost layer of the anticorrosion laminate film (on the outer surface side of the metal foil, i.e., when the anticorrosion laminate film of the present invention is provided on a material to be protected, such as steel, to be protected from corrosion, the surface opposite the material to be protected, via the metal foil. Hereinafter, this may be simply referred to as the "outermost layer"). However, it may also be provided on both sides of the metal foil via an adhesive layer described below, and three or more ultraviolet ray-shielding layers may be provided in the anticorrosion laminate film.

[0043] [mechanism] The present inventors have found that the reason why there have been no anticorrosion films or tapes capable of maintaining weather resistance and waterproofing properties over a long period of time, and that the lack of anticorrosion films or tapes with excellent long-term durability is due to the failure to take into account the combined effects of light energy, water, and oxygen. Based on this finding, they have discovered that the light energy equivalent to approximately 100 kcal / mol of the bond energy between a carbon atom C and a hydrogen atom H or the bond energy between an oxygen atom O and a hydrogen atom H is light with a wavelength of 300 nm in the ultraviolet range, and that providing at least one layer that efficiently blocks light with a wavelength of 300 nm, i.e., the ultraviolet light-shielding layer I or ultraviolet light-shielding layer II having a specific configuration according to the present invention, not only prevents film degradation due to light energy but also prevents oxidation and the formation of a hydroxide film on the metal foil surface that occurs in the presence of light, water, and oxygen, thereby preventing the cleavage of C-O bonds at the interface between the metal foil surface and the resin layer that constitutes the anticorrosion laminate film and preventing delamination between the metal foil and various resin layers and between various resin layers, thereby improving weather resistance and waterproofing. According to the anticorrosion laminate film of the present invention, which comprises a metal foil and an ultraviolet ray shielding layer I or an ultraviolet ray shielding layer II having a specific configuration, it is possible to realize an anticorrosion laminate film having excellent long-term durability in terms of weather resistance, waterproofness, and anticorrosion properties through this mechanism.

[0044] [UV light blocking layer] The ultraviolet ray shielding layer I is an ultraviolet ray shielding layer containing carbon black and / or titanium oxide, and the ultraviolet ray shielding layer II is an ultraviolet ray shielding layer having an average transmittance of 50% or less for ultraviolet rays having a wavelength of 250 nm or more and 350 nm or less. The ultraviolet ray shielding layer of the present invention may have a single layer structure or a laminated structure of two or more layers, so long as it satisfies the above requirements. The ultraviolet light blocking layer is usually formed as a resin layer.

[0045] The ultraviolet ray-shielding layer of the present invention is provided as at least the outermost layer of the anticorrosion laminate film or anticorrosion tape of the present invention, and serves to protect the metal foil and other layers interposed between the metal foil and the ultraviolet ray-shielding layer from the external environment.

[0046] The ultraviolet ray shielding layer I may contain either carbon black or titanium oxide, or both. However, if each is used alone, carbon black will result in a jet black color that is unsightly, and titanium oxide will result in a white color that makes dirt more noticeable. Therefore, it is preferable to use carbon black and titanium oxide in a mixing ratio such that the average ultraviolet transmittance of the ultraviolet ray shielding layer formed at wavelengths of 250 nm or more and 350 nm or less is 50% or less, and to adjust the color to a gray color that is an intermediate color between black and white. By doing so, it is preferable to adjust the average transmittance of ultraviolet light having a wavelength of 250 nm or more and 350 nm or less through the ultraviolet ray shielding layer I to 50% or less, particularly 40% or less, and especially 10% or less.

[0047] The ultraviolet ray shielding layer II is a resin layer having an average transmittance of 50% or less for ultraviolet rays having a wavelength of 250 nm or more and 350 nm or less. The average ultraviolet transmittance of the ultraviolet ray shielding layer II for wavelengths of 250 nm or more and 350 nm or less may be 50% or less, but from the viewpoint of obtaining the effects of the present invention more effectively, this average ultraviolet ray transmittance is preferably 40% or less, and more preferably 10% or less.

[0048] The lower the average transmittance of ultraviolet light having a wavelength of 250 nm or more and 350 nm or less of the ultraviolet light shielding layer of the present invention, the more preferable it is, and there is no particular lower limit.

[0049] The ultraviolet shading layer II having an average transmittance of 50% or less for ultraviolet rays having a wavelength of 250 nm or more and 350 nm or less can be formed by combining a resin and pigment blend and a film thickness that will provide such an average transmittance. Examples of pigments that can be used include, but are not limited to, carbon black, titanium oxide, aluminum powder, silver, and iron oxide. Particularly preferred pigments are carbon black and titanium oxide. Although any of them may be used alone, as described for the ultraviolet ray shielding layer I, it is preferable to use them in combination so that the average transmittance of ultraviolet rays having a wavelength of 250 nm or more and 350 nm or less is 50% or less.

[0050] <Resin for UV-shielding layer> Examples of resins constituting the ultraviolet light-shielding layer of the present invention include polyolefins such as polypropylene, polyethylene (high density, medium density, low density, linear low density), propylene-ethylene block or random copolymers, and acid-modified products thereof; rubber or latex components such as ethylene-propylene copolymer rubber, styrene-butadiene rubber, styrene-butadiene-styrene block copolymers or hydrogenated derivatives thereof; polybutadiene, polyisobutylene, polyvinylidene fluoride (PVDF), polyvinyl fluoride, chlorotrifluoroethylene, ethylene-tetrafluoroethylene copolymer (ETFE), polytetrafluoroethylene (PTFE), hexafluoropropylene, perfluoroalkyl vinyl ether copolymers, acrylic acid alkyl ester copolymers, polyester ester copolymers, polyether ester copolymers, polyether amide copolymers, polyurethane copolymers, vinyl chloride resins, and the like, or mixtures of two or more of these.

[0051] In particular, for the purpose of imparting impact resistance and weather resistance to protect against impact and the external environment, and because various pigments are blended as ultraviolet ray shielding agents, the resin forming the ultraviolet ray shielding layer of the present invention is preferably polypropylene, polyethylene (high density, medium density, low density, linear low density), polyolefin such as propylene-ethylene block or random copolymer, or acid-modified product thereof, rubber or latex component such as ethylene-propylene copolymer rubber, styrene-butadiene rubber, styrene-butadiene-styrene block copolymer or hydrogenated derivative thereof, polybutadiene, or polyisobutylene.

[0052] More preferred resins for forming the ultraviolet ray-shielding layer of the present invention include polyethylene resins, i.e., those primarily composed of high-density, medium-density, low-density, or linear low-density polyethylene, polyolefin resins primarily composed of random or block polypropylene, and polyolefin resins modified with acid or silane. Among these, preferred are single-layer or laminate structures containing a polyethylene resin layer primarily composed of linear low-density polyethylene (LLPE), high-density polyethylene (HDPE), or medium-density polyethylene (MDPE), and also preferred are single-layer or laminate structures containing a resin layer primarily composed of block polypropylene (BPP) or random polypropylene (RPP).

[0053] The ultraviolet ray shielding layer of the present invention may contain components other than the resins such as the polyethylene resins described above, as long as the above conditions are satisfied.

[0054] Polyethylene resin has a lower melting point than polypropylene resin, but it is a polymer whose molecules cross-link when heat is repeatedly applied. When exposed to high temperatures for long periods of time in hot outdoor environments where the temperature of steel rises to 40-80°C, its molecules are less likely to break, and it has better long-term heat resistance than polypropylene resin. Furthermore, polyethylene resin has high melt tension, flexibility, resistance to deformation, resistance to whitening during deformation, and excellent cold resistance. Polyethylene resin also has a higher density than polypropylene resin, and is highly resistant to external moisture and polar solvents contained in the adhesive layer.

[0055] In the present invention, linear low-density polyethylene (LLPE) refers to a copolymer of ethylene and an α-olefin having about 4 to 20 carbon atoms. Specific examples of the branched side chain composed of α-olefin include various comonomers such as butene-1, hexene-1, 4-methylpentene-1, octene-1, decene-1, tetracene-1, and octadecene-1. Two or more of these α-olefins may be used in combination. Furthermore, when an α-olefin having about 4 to 20 carbon atoms is used as a comonomer, propylene may also be used as a comonomer.

[0056] Any linear low-density polyethylene (LLPE) can be used as long as it can keep the MFR, density, and tensile modulus within the preferred ranges described below. Among these, linear low-density polyethylenes having at least one side chain of butene-1, hexene-1, or octene-1 are particularly preferred because they have appropriate flexibility, and hexene-1 and octene-1 are particularly preferred because they have excellent solvent resistance.

[0057] There are no particular limitations on the method for producing linear low-density polyethylene (LLPE), and any known method for producing polyolefin resins can be used. However, it is generally preferred to produce LLPE using a Ziegler catalyst, a metallocene catalyst, or the like.

[0058] The polyethylene resin of the present invention can also contain polyethylene resins other than linear low-density polyethylene (LLPE). The polyethylene resins other than linear low-density polyethylene (LLPE) are not limited, but specific examples include high-density polyethylene (HDPE), medium-density polyethylene (MDPE), and low-density polyethylene (LDPE). Low-density polyethylene (LDPE) does not include the linear low-density polyethylene (LLPE), and typically includes what is called high-pressure low-density polyethylene. The methods for producing high-density polyethylene (HDPE), medium-density polyethylene (MDPE), and low-density polyethylene (LDPE) are not limited, and known methods can be used, but production using a Ziegler catalyst, a metallocene catalyst, or the like is generally preferred.

[0059] In particular, since the ultraviolet ray shielding layer of the present invention contains a pigment, a preferred resin for forming the ultraviolet ray shielding layer is polyethylene in which LLPE is blended with LDPE at a ratio of 2% by mass to 40% by mass, which is preferable in terms of affinity with the pigment and film formation stability.

[0060] The resin constituting the ultraviolet ray shielding layer of the present invention is, for example, a polyolefin resin having a melt flow rate (MFR) of 0.1 g / 10 min or more and 20 g / 10 min or less and a density of 0.88 g / cm 3 More than 0.960g / cm 3 Hereinafter, the tensile modulus is preferably 100 MPa or more and less than 2000 MPa. The MFR, density, and tensile modulus of elasticity of the resin are measured by the methods described in the Examples section below.

[0061] If the MFR of the resin constituting the ultraviolet ray shielding layer is greater than 20 g / 10 min, the molecular weight of the polymer will be low, solvent resistance will be reduced, and weather resistance may be poor. The MFR is preferably 10 g / 10 min or less, more preferably 5 g / 10 min or less, and even more preferably 3 g / 10 min or less. The lower limit of the MFR must be at a level that does not cause problems in film formation when forming a film by inflation molding, so it is 0.1 g / 10 min or more, and in particular, 0.3 g / 10 min or more is preferred because it allows high-speed molding in inflation molding to be maintained.

[0062] In addition, the density of the resin that makes up the UV-shielding layer is 0.88 g / cm 3 If the density is smaller than this, the solvent resistance and waterproof resistance may be deteriorated. In order to block moisture from the outside and to improve resistance to solvents, the density of the ultraviolet ray shielding layer should be relatively high, and a more preferable lower limit of the density is 0.918 g / cm. 3 More preferably, 0.920 g / cm 3 More preferably, it is 0.923 g / cm 3 The upper limit of the density is preferably 0.960 g / cm as long as flexibility is not impaired. 3 or less, more preferably 0.950 g / cm 3 Taking into consideration whitening resistance, the upper limit of the density is more preferably 0.945 g / cm 3 The following is the result. The means for adjusting the density to the above range is not limited, but examples thereof include optimizing the polyethylene resin, and, as described above, using polyethylene resin and a resin other than polyethylene resin in combination and optimizing the blending ratio thereof.

[0063] The tensile modulus of the resin constituting the ultraviolet ray shielding layer of the present invention is preferably 100 MPa or more, since too much flexibility can easily cause material breakage when subjected to external forces such as deformation, and too hardness can easily make the resin brittle and prone to peeling from the metal foil in contact with the resin via an adhesive layer described below, so the tensile modulus is preferably less than 2000 MPa, and more preferably 1500 MPa or less. The tensile modulus of the resin constituting the ultraviolet ray shielding layer is more preferably 130 MPa or more and 1000 MPa or less, and even more preferably 180 MPa or more and 900 MPa or less.

[0064] The above-mentioned values ​​of MFR, density, and tensile modulus refer to the properties of the resin constituting the ultraviolet ray-shielding layer, and when a plurality of polyethylene resins are used in combination as the polyethylene resin or when a resin other than polyethylene resin is contained, they refer to the values ​​as a resin composition.

[0065] In the present invention, particularly, the ultraviolet ray-shielding layer is a layer containing linear low-density polyethylene as a main component, and an acid-modified polyethylene resin layer having the above-mentioned suitable tensile modulus, density, MFR and melting point is used for the adhesive layer described below, which is the side to be attached to the metal foil, thereby making it possible to further increase strength and waterproof resistance.

[0066] The ultraviolet ray-shielding layer may also have a multilayer structure, such as a laminate structure of a layer mainly composed of linear low-density polyethylene and a random polypropylene layer or a block polypropylene layer, or a laminate structure of a layer mainly composed of linear low-density polyethylene and a layer mainly composed of medium-density polyethylene or high-density polyethylene, or may further have a multilayer laminate structure of about 3 to 5 layers.

[0067] <Pigments> As described above, the ultraviolet ray shielding layer I contains carbon black and / or titanium oxide. The ultraviolet ray shielding layer II usually contains a pigment in order to make the average transmittance of ultraviolet rays having a wavelength of 250 nm or more and 350 nm or less 50% or less. The pigment to be blended in the ultraviolet ray shielding layer of the present invention can be selected appropriately from inorganic pigments, organic pigments, etc., but inorganic pigments, which are particularly excellent in weather resistance and light shielding properties, are preferred. For example, the black pigment carbon black is preferred because of its high light-blocking properties, but black can absorb heat and accelerate heat deterioration of resins, and it is also difficult to incorporate in large quantities from the standpoint of design. Therefore, it is preferred to use titanium-based pigments such as titanium oxide, chromium-based pigments such as chromium oxide and chrome vermilion, yellow lead, iron oxide, calcium carbonate, baryte powder, aluminum powder, zinc sulfide, zinc oxide, nickel, lead, copper powder, talc, kaolin, mica, magnesium carbonate, etc. in combination with carbon black to further enhance UV light-blocking properties and improve design properties.

[0068] When exposed to high-energy light such as ultraviolet light, radicals are generated, which can cause resin degradation, so care must be taken when selecting pigments. Therefore, particularly preferred pigments are carbon black and titanium oxide pigments, and although they may be used alone, as mentioned above, it is preferable to use them in combination in terms of ultraviolet light blocking properties and design properties.

[0069] From the viewpoint of ultraviolet light blocking properties and pigment dispersibility, the carbon black preferably has a primary particle diameter of 15 nm or more and 60 nm or less. From a similar viewpoint, titanium oxide having a primary particle diameter of 50 nm or more and 450 nm or less is preferred, and among these, radical generation-suppressing coated titanium oxide, whose surface is coated with an inorganic substance (silicon dioxide, alumina, etc.) that prevents or captures radical generation, is particularly preferred in terms of light-blocking properties, heat-preventing properties, and design properties. The primary particle diameters of carbon black and titanium oxide herein are the average values ​​of the primary particle diameters of 10 particles observed under a transmission electron microscope.

[0070] The carbon black content in the ultraviolet ray shielding layer of the present invention varies depending on whether titanium oxide is used in combination, but is preferably 0.05 to 10% by mass. If the carbon black content is 0.05% by mass or more, the ultraviolet ray shielding properties are enhanced, and if it is 10% by mass or less, the mechanical properties and design properties of the film are not impaired. From this perspective, the carbon black content is more preferably 0.07 to 7% by mass, and even more preferably 0.1 to 5% by mass.

[0071] The content of titanium oxide in the ultraviolet ray shielding layer of the present invention varies depending on whether or not carbon black is used in combination, but is preferably 0.3 to 20% by mass. If the content of titanium oxide is 0.3% by mass or more, the ultraviolet ray shielding property is enhanced, and if it is 20% by mass or less, the mechanical properties of the film are not impaired. From this viewpoint, the content of titanium oxide is more preferably 0.5 to 17% by mass, and even more preferably 1 to 15% by mass.

[0072] When the ultraviolet ray shielding layer of the present invention contains both carbon black and titanium oxide, the total content thereof is preferably 1 to 25% by mass. If the total content of carbon black and titanium oxide exceeds 25% by mass, the film may become brittle, and if it is less than 1% by mass, the desired ultraviolet ray shielding properties may not be obtained. From this viewpoint, the total content of carbon black and titanium oxide is more preferably 1.2 to 20% by mass, and even more preferably 1.5 to 17% by mass. The mass ratio of carbon black to titanium oxide is preferably carbon black:titanium oxide=1:-50, particularly preferably 1:-40, from the viewpoint of more effectively obtaining the effect of using them in combination.

[0073] The ultraviolet ray shielding layer of the present invention may contain pigments other than carbon black and titanium oxide. In this case, it is preferable from the viewpoint of film formability that the total content of carbon black, titanium oxide and other pigments be 50 mass % or less.

[0074] <Other ingredients> To prevent deterioration of mechanical properties and ultraviolet degradation due to resin hardening caused by the incorporation of pigments, various additives may be added to the ultraviolet ray shielding layer of the present invention, within the range that does not impair the effects of the present invention, such as various elastomer components including olefin elastomers such as ethylene-propylene copolymer, ethylene-butene copolymer, propylene-butene copolymer, ethylene-butene-propylene copolymer, ethylene-propylene-diene copolymer, styrene elastomer, polyester elastomer, polyamide elastomer, antioxidant, heat stabilizer, various plasticizers, light stabilizer, ultraviolet absorber, neutralizing agent, lubricant, antifogging agent, antiblocking agent, crosslinking agent, crosslinking aid, colorant, flame retardant, dispersant, etc. In particular, as will be described later, it is preferable to incorporate a light stabilizer into the ultraviolet light shielding layer of the present invention in order to improve light resistance and weather resistance.

[0075] <Thickness> The thickness of the ultraviolet ray shielding layer of the present invention is preferably 5 μm or more and 200 μm or less, more preferably 10 μm or more and 150 μm or less, even more preferably 10 μm or more and 100 μm or less, and particularly preferably 15 μm or more and 100 μm or less. If the thickness of the ultraviolet ray shielding layer is thinner than the above lower limit, the weather resistance and water resistance may be insufficient, and the corrosion prevention properties may be reduced. In addition, the flexibility may be insufficient, and the workability may be poor. On the other hand, if the thickness of the ultraviolet ray shielding layer is thicker than the above upper limit, the handleability may be deteriorated. Here, the thickness of the ultraviolet ray-shielding layer refers to the thickness per layer (per location). Here, one layer refers to a layer that does not include an adhesive layer, for example, a layer adjacent to an adhesive layer. If one resin layer has a laminated structure of multiple layers, the thickness refers to the total thickness of the layers.

[0076] <Surface texture> The ultraviolet ray shielding layer of the present invention is preferably provided with an uneven surface to improve adhesion between the adhesive layer when it is attached to a material to be protected such as a steel material, and between the adhesive layer when it is attached to a highly elastic resin layer described below. In this case, the surface roughness Ra of the uneven surface is preferably about 0.1 to 1.2 μm, particularly about 0.2 to 0.8 μm. Furthermore, one or both surfaces of the ultraviolet ray-shielding layer may be subjected to treatments such as corona discharge treatment, plasma treatment, primer treatment, anchor coating treatment, etc. to improve adhesion to the pressure-sensitive adhesive layer or bonding layer and to improve paintability when painting is performed. In this case, the contact angle of the treated surface with water is preferably 50° to 115°, and particularly preferably 55° to 110°.

[0077] <Method of manufacturing the ultraviolet ray shielding layer> The ultraviolet ray-shielding layer of the present invention can be formed into a film by mixing the resin and pigment such as carbon black or titanium oxide constituting the ultraviolet ray-shielding layer of the present invention described above, and other components such as a light stabilizer used as needed, melt-kneading the resin composition in a twin-screw extruder, and then extrusion-molding the mixture by inflation molding, T-die molding, or the like. However, when an adhesive layer, which will be described later, is provided, it is preferable in terms of production efficiency to form the film by co-extrusion inflation molding with the adhesive layer. In addition, a masterbatch can be created by melt-kneading pigments at a high concentration into resins such as LDPE or LLPE in a twin-screw extruder, and then dry-blending the material with other resins to form a film using extrusion molding such as inflation molding or T-die molding.

[0078] [Adhesive layer] In the present invention, in order to strengthen the adhesion between the metal foil and the ultraviolet ray shielding layer, an adhesive layer made of a thermoplastic heat-adhesive resin or a thermosetting resin can be provided between the metal foil and the ultraviolet ray shielding layer.

[0079] In the present invention, the adhesive layer made of a thermoplastic thermal adhesive resin also functions as a protective layer for protecting the metal foil over a long period of time. Therefore, by providing an adhesive layer made of a thermoplastic thermal adhesive resin on the metal foil, it is possible to prevent pinholes and tears in the metal foil and improve its waterproofness, corrosion resistance, and strength. In addition, the adhesive layer made of a thermoplastic thermal adhesive resin also serves as a cushion to compensate for the decrease in mechanical strength of the UV-shielding layer, which contains a large amount of pigment. As a result, the waterproofness and weather resistance of the anticorrosion film can be significantly improved over a long period of time, and the anticorrosion effect can be maintained. Here, the term "thermoplastic thermal adhesive resin" refers to a resin that exhibits adhesive properties when heated and melted. Furthermore, "adhesion" refers to a condition in which the thermal adhesive resin is heated to above its melting point, melted, and adhered to a metal foil, and then exhibits an adhesive strength of 3N / 15mm or more when measured using a T-peel test method under normal temperature and humidity conditions of 23°C and 50%.

[0080] Examples of the thermoplastic thermal adhesive resin that constitutes the adhesive layer include thermoplastic resins containing the following resins as main components. Metal-modified polyolefin resin Acid-modified resins in which a portion of a thermoplastic resin is modified with acid, such as polyolefin resins modified with maleic anhydride, Polyvinyl acetate resin Epoxy-modified resin, mixed resin containing at least one of glycidyl methacrylate, vinyl acetate, methyl acrylate, etc. Resin in which ethylene and acrylic acid are copolymerized to give polar groups such as carboxyl groups Ionomer resins, for example, resins with ionic bonds between polymer structures, in which alkali metals or alkaline earth metals are bonded to copolymers of ethylene and acrylic acid or methacrylic acid to form cross-linked structures.

[0081] In the present invention, the term "main component" refers to the component that is contained in the largest amount by weight in a material containing a plurality of components. Preferably, the main component of a thermoplastic thermal adhesive resin is a component that accounts for 50% by mass or more of 100% by mass of the thermoplastic thermal adhesive resin, more preferably 70% by mass or more, and even more preferably 80% by mass or more and 100% by mass or less.

[0082] These thermoplastic thermal adhesive resins differ from the dry laminating adhesives used in laminate films for general packaging materials in that they are heated and melted, then heated and pressed against metal foil, and then cooled and solidified, causing crystalline lamellae to grow toward the metal foil, not only helping to protect the metal foil from water and UV rays, but also reacting strongly with the polar groups on the surface of the metal foil, which has barrier properties, and the flexibility unique to thermoplastic resins helps to alleviate external physical stress, protecting the metal foil and allowing it to maintain its adhesive strength and waterproof and corrosion-resistant properties for a long period of time.

[0083] Of the above-mentioned exemplary resins, the thermoplastic thermal adhesive resin is preferably an acid-modified polyolefin resin or an acid-modified fluororesin, from the viewpoint of excellent protective effect.

[0084] Examples of acid-modified polyolefin resins include acid-modified polyethylene resins containing high-, medium-, low-, or linear low-density polyethylene as the main component, and acid-modified polypropylene resins containing random or block polypropylene as the main component. As the acid-modified fluororesin, an acid-modified fluororesin copolymerized with an ethylene component is easy to use because it has a low melting point. Particularly preferred are flexible low-density polyethylene, acid-modified polyethylene resins mainly composed of linear low-density polyethylene (LLPE), acid-modified polypropylene resins mainly composed of random or block polypropylene, acid-modified ETFE obtained by acid-modifying ethylene tetrafluoroethylene (ETFE), and tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer (PFA), and acid-modified PFA.

[0085] The melting point of these thermoplastic thermal adhesive resins is preferably 60° C. or higher and 250° C. or lower in terms of lamination processability and adhesion to metal foil. Furthermore, the thermoplastic thermal adhesive resin preferably has a resin fluidity, expressed as a melt flow rate (MFR), of 0.1 g / 10 min to 20 g / 10 min in terms of lamination processability and adhesion, as well as the melting point. The melting point and MFR are values ​​measured by the method described in the Examples section below.

[0086] As mentioned above, linear low-density polyethylene (LLPE) refers to a copolymer of ethylene and an α-olefin having approximately 4 to 20 carbon atoms. Specific examples of the branched side chains composed of α-olefins include one or more of various comonomers such as butene-1, hexene-1, 4-methylpentene-1, octene-1, decene-1, tetracene-1, and octadecene-1.

[0087] The reason why an acid-modified polyethylene resin is preferred as the acid-modified polyolefin resin used as the thermoplastic thermal adhesive resin is as follows. Polyethylene resin has a lower melting point than polypropylene resin, but it is a polymer whose molecules cross-link when exposed to repeated heat. It is less susceptible to molecular cleavage when exposed to harsh high-temperature environments of 80-90°C for long periods of time, and has better long-term heat resistance than polypropylene resin. Furthermore, polyethylene resin has high melt tension, is flexible, and is resistant to deformation when laminated to steel materials of any shape, does not easily turn white when deformed, and has excellent cold resistance. Polyethylene resin also has a higher density than polypropylene resin, and is highly resistant to external moisture and ultraviolet rays. Such acid-modified polyethylene resins also have excellent adhesion to metal foils, such as aluminum foil, and can achieve strong adhesion without having to subject the aluminum foil to environmentally polluting chromium-based or phosphorus-based chemical conversion treatments.

[0088] The acid-modified polyolefin resin and acid-modified fluororesin used in the present invention may be at least partially acid-modified. The acid-modified polyolefin resin and acid-modified fluororesin can be produced, for example, by modifying a polyolefin resin or a fluororesin with an unsaturated carboxylic acid and / or a derivative thereof through graft polymerization.

[0089] The unsaturated carboxylic acid or unsaturated carboxylic acid derivative used for modification is not particularly limited, and examples thereof include dicarboxylic acids such as maleic acid, fumaric acid, itaconic acid, citraconic acid, and mesaconic acid; unsaturated monocarboxylic acids such as acrylic acid, methacrylic acid, and crotonic acid; and anhydrides, amides, imides, esters, and other derivatives of dicarboxylic acids such as maleic anhydride, fumaric anhydride, itaconic anhydride, and mesaconic anhydride. Among these, it is preferable to use maleic acid, maleic anhydride, acrylic acid, and methacrylic acid, and maleic anhydride is particularly suitable.

[0090] The method for modifying a polyolefin resin is not particularly limited, but examples thereof include a solution method in which a polyolefin resin such as a polyethylene resin or a polypropylene resin is dissolved in an organic solvent and reacted with an acid (such as maleic anhydride) in the presence of a radical generator, and a melt method in which such a resin is heated and melted and reacted with an acid (such as maleic anhydride) in the presence of a radical generator.

[0091] The polyolefin resin to be subjected to acid modification may be linear low-density polyethylene (LLPE), which is suitable as a main component, or other polyethylene resins that can be used in combination therewith, such as high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), or polypropylene resins, such as random polypropylene (RPP). Here, low-density polyethylene (LDPE) does not include the linear low-density polyethylene (LLPE), and examples thereof include what is commonly called high-pressure low-density polyethylene.

[0092] In addition, an acid-modified polyolefin resin and a non-acid-modified polyolefin resin can be appropriately blended and used. When an acid-modified polyolefin is used in combination with another polyolefin resin, these polyolefin resins may be acid-modified in a mixed or coexisting state, or at least one of the polyolefin resins may be acid-modified in advance and then mixed with the other non-acid-modified polyolefin resin.

[0093] If the modification rate of the acid-modified polyolefin resin (the content of acid groups in the acid-modified polyolefin resin) is too low, the effect of improving adhesiveness due to the acid modification may not be fully obtained, and if it is too high, the heat resistance of the acid-modified polyolefin resin tends to decrease. Therefore, it is preferable that the modification rate be 0.05% by mass or more and 10% by mass or less, and particularly 0.2% by mass or more and 5% by mass or less. The modification rate of the acid-modified polyolefin resin can be confirmed by means of, for example, infrared absorption spectroscopy (IR) or titration. In addition, when an acid-modified polyolefin resin and a non-acid-modified polyolefin resin are blended and used, the modification rate refers to the modification rate in all polyolefin resins including the non-acid-modified polyolefin resin.

[0094] As the acid-modified polyolefin resin, commercially available products can be used, and for example, those corresponding to the above can be appropriately selected and used from the Modic (trade name) series manufactured by Mitsubishi Chemical Corporation and Admer (trade name) manufactured by Mitsui Chemicals, Inc.

[0095] The adhesive layer may contain a resin other than the acid-modified polyolefin resin as long as it does not impair the effects of the present invention. The resin other than the acid-modified polyolefin resin is not limited, but examples thereof include ethylene-based resins copolymerized with ethylene and a comonomer other than an α-olefin, such as glycidyl methacrylate resin, vinyl acetate resin, methyl acrylate resin, ethylene-vinyl acetate copolymer, and ethylene-vinyl alcohol copolymer; propylene-based resin, vinyl chloride resin, polyamide resin, polyester resin, and polycarbonate resin. If the adhesive layer contains a large amount of resin other than the acid-modified polyolefin resin, the effects of using the acid-modified polyolefin resin may be impaired. Therefore, it is preferable to use these resins in the adhesive layer in a range of 20% by mass or less, preferably 15% by mass or less. Furthermore, the adhesive layer may be a layer in which one or more olefin-based elastomers selected from the group consisting of ethylene-propylene copolymer, ethylene-butene copolymer, propylene-butene copolymer, ethylene-propylene-butene copolymer, and ethylene-propylene-diene copolymer are blended with the acid-modified polyolefin resin as described above, in a total amount of 5% by mass or more and 30% by mass or less, particularly 7% by mass or more and 25% by mass or less in the adhesive layer. When the adhesive layer contains these olefin-based elastomers, these elastomer components orient in the thickness direction when the layers are bonded by thermal lamination, thereby driving a wedge of the acid-modified polyolefin resin into the metal foil and promoting the crystallization of the acid-modified polyolefin resin in the adhesive layer, resulting in a corrosion-resistant laminate film with excellent long-term water resistance and weather resistance.

[0096] On the other hand, examples of acid-modified fluororesins include those obtained by acid-modifying ETFE and those obtained by acid-modifying PFA, and there are no particular limitations on them, and commercially available thermoplastic fluororesins may also be acid-modified.

[0097] Fluorine resins are particularly preferred because they inherently have excellent weather resistance, produce very little plasticizer bleeding, have high density, and are highly water-resistant. Therefore, there are few restrictions imposed by the grade characteristics of the resin, and if they can be directly bonded to metal foil, the long-term corrosion resistance of the metal foil can be dramatically improved. From the viewpoints of processability, ease of handling, and adhesiveness, it is preferable to use an acid-modified fluororesin having a melting point of 230° C. or less.

[0098] If the modification rate of the acid-modified fluororesin (the content of acid groups in the acid-modified fluororesin) is too low, the effect of improving adhesiveness due to the acid modification may not be fully obtained, and if it is too high, the heat resistance of the acid-modified fluororesin tends to decrease. Therefore, it is preferably 0.05% by mass or more and 10% by mass or less, particularly 0.2% by mass or more and 5% by mass or less. The modification rate of the acid-modified fluororesin can be confirmed by means of, for example, infrared absorption spectroscopy (IR) or titration. In addition, when an acid-modified fluororesin and a non-acid-modified fluororesin are blended and used, the modification rate refers to the modification rate in the entire fluororesin including the non-acid-modified fluororesin.

[0099] As the acid-modified fluororesin, commercially available products can be used, and for example, those corresponding to the above can be appropriately selected and used from among Neoflon (trade name) manufactured by Daikin Corporation, Fluon (trade name) manufactured by AGC Corporation, etc.

[0100] The adhesive layer may contain only one kind of such acid-modified resin, or may contain two or more kinds of such acid-modified resins.

[0101] The adhesive layer may also contain various additives such as antioxidants, heat stabilizers, various plasticizers, light stabilizers, ultraviolet absorbers, ultraviolet reflectors, radical trapping materials, neutralizing agents, lubricants, anti-fogging agents, anti-blocking agents, crosslinking agents, crosslinking aids, colorants, flame retardants, and dispersants. For example, the adhesive layer may contain a polymeric hindered amine light stabilizer, which is preferably used as a light stabilizer as described below, in a suitable content as described below.

[0102] The adhesive layer preferably has an MFR of 0.1 g / 10 min or more and 25 g / 10 min or less. If the MFR of the adhesive layer is greater than 25 g / 10 min, the molecular weight will be small, and long-term water resistance and weather resistance will tend to be poor. The MFR of the adhesive layer is more preferably 20 g / 10 min or less, and even more preferably 10 g / 10 min or less. The lower limit of the MFR of the adhesive layer is preferably 0.1 g / 10 min or more, since it is preferable that the level is at a level that does not cause problems in film formation when film is formed by inflation molding, and in particular, 0.3 g / 10 min or more is preferable, since it can maintain high-speed formability and high seal strength in inflation molding.

[0103] The density of the adhesive layer is 0.88 g / cm for polyolefin-based adhesives. 3 If the density is lower than this, the density of the adhesive layer should be higher in order to improve the water resistance that blocks moisture from the outside, and the lower limit of the preferred density is 0.91 g / cm 3 More preferably, it is 0.92 g / cm 3 The upper limit of the density of the adhesive layer is not particularly limited as long as it does not impair the flexibility of the polyolefin resin, but the upper limit of the density is usually 0.96 g / cm 3 Considering the adhesiveness to the metal foil and the resistance to whitening due to deformation during construction, the preferred thickness is 0.95 g / cm 3 The following is the result. There are no particular limitations on the means for achieving the density of the adhesive layer within the above range, but examples include optimizing the polyolefin resin, such as polyethylene resin, used for acid modification, optimizing the modification rate, and, as mentioned above, using a polyolefin resin that is not acid-modified or a resin other than a polyolefin resin in combination and optimizing the blending ratio thereof. In addition, the normal density of fluorine-based materials is 1 g / cm 3 In addition, fluororesin itself has excellent weather resistance and water resistance, so there are no particular problems. Considering copolymerization with other components and alloys with other materials, the density of fluororesin systems is 1.5 g / cm 3 It is preferable that it is 1.7 g / cm or more. 3 More than 2.2g / cm 3 If the thickness is less than this, the effect of the fluororesin is exhibited in terms of adhesion to the metal foil and water resistance, so this is particularly preferred.

[0104] The tensile modulus of the adhesive layer is preferably 100 MPa or more, since too much flexibility can easily cause material breakage when external forces such as deformation act on it, while too hardness can easily make it brittle and prone to peeling at the interface with the metal foil, so the tensile modulus is preferably 2000 MPa or less. The tensile modulus of the adhesive layer is more preferably 130 MPa or more and 800 MPa or less, and particularly preferably 180 MPa or more and 600 MPa or less.

[0105] The melting point of the adhesive layer is preferably 70°C or higher and 230°C or lower, particularly preferably 90°C or higher and 200°C or lower. Using a thermoplastic thermal adhesive resin with a melting point higher than the above temperatures is preferable because the light stabilizer and antioxidant contained therein may decompose due to the heating temperature during extrusion processing, resulting in a decrease in molecular weight and causing bleed-out and loss, and may also cause thermal degradation of the acid-modified resin.

[0106] The above-mentioned values ​​of MFR, density, tensile modulus, and melting point refer to the properties of the thermoplastic thermal adhesive resin that constitutes the adhesive layer, and when multiple resins are used in combination or when a material other than resin is contained, they refer to the values ​​as a resin composition. The methods for measuring these physical properties are as shown in the Examples section below.

[0107] In the present invention, when a film formed by inflation molding in which a thermoplastic thermal adhesive resin is extruded from a circular die is used as the adhesive layer, a homogeneous adhesive film can be obtained in which there is no difference in physical properties such as tensile strength and elongation in the longitudinal and transverse directions. When a high-elasticity resin layer described below is laminated as the ultraviolet ray shielding layer of the present invention or further as a protective layer, even if a uniaxially or biaxially stretched film or a non-stretched film having a difference in mechanical strength in the longitudinal and transverse directions, such as a T-die molding method, is used as the ultraviolet ray shielding layer or protective layer, defects in the longitudinal and transverse directions are unlikely to occur when the anticorrosion film is attached to the material to be protected, such as steel, and this is preferred because it increases the number of films that can be used as the ultraviolet ray shielding layer or protective layer.

[0108] In the anticorrosion laminate film of the present invention, the adhesive layer is provided on at least one side of the metal foil, i.e., between the metal foil and the ultraviolet ray shielding layer of the present invention, and may be provided on both sides of the metal foil. Furthermore, when a highly elastic resin layer is provided as a protective layer, which will be described later, it may be provided so as to be interposed between the protective layer and the metal foil, or between the protective layers. As described above, the ultraviolet ray shielding layer of the present invention is provided as the outermost layer of the anticorrosion laminate film of the present invention, but in some cases, an adhesive layer may be further provided thereon, and the adhesive layer may form the outermost layer of the anticorrosion laminate film of the present invention. In either case, when the anticorrosion laminate film of the present invention is applied to the outer surface of the metal foil, i.e., to the material to be protected, such as steel, it is preferable to have at least an adhesive layer on the side opposite the material to be protected, as this also has the effect of a protective layer.

[0109] The adhesive layer provided on the outermost layer side of the metal foil preferably contains a light stabilizer from the viewpoint of improving light resistance and weather resistance. However, if an ultraviolet ray blocking agent is added to the adhesive layer, there is a risk that the adhesive function will be impaired. Therefore, when an ultraviolet ray blocking agent is used, it is preferable to add it to an extent that does not impair the adhesive property, and in the present invention, ultraviolet rays are blocked by the ultraviolet ray blocking layer.

[0110] The thickness of the adhesive layer is preferably 2 μm to 100 μm, more preferably 5 μm to 50 μm, and particularly preferably 8 μm to 40 μm. If the thickness of the adhesive layer is thinner than the above range, sufficient adhesive strength for bonding to the metal foil may not be obtained, and if it is thicker than the above range, flexibility may be lost, causing problems in application. The thickness of the adhesive layer herein refers to the thickness of one adhesive layer (per location). Here, one adhesive layer refers to a layer that does not include a protective layer (described later), such as a metal foil or a layer adjacent to the aforementioned ultraviolet light-shielding layer or a protective layer (described later). If one adhesive layer has a laminated structure of multiple layers, the thickness refers to the total thickness of the layers.

[0111] [Metal foil] The metal foil is a layer that acts as a barrier to completely prevent moisture from penetrating the interior from the outside, and is required to be pinhole-free, have high tensile strength as a corrosion-protective laminate film, and be resistant to cracking against deformation and stretching due to external forces.

[0112] Although there are no restrictions on the metal foil, aluminum and its alloys, SUS stainless steel, and other materials that are corrosion-resistant and inexpensive are used. Furthermore, from the perspective of crack resistance, pure aluminum (aluminum) with a purity of 99% or higher, Al-Cu-Mg alloys, Al-Mn alloys, Al-Si alloys, Al-Mg alloys, Al-Mg-Si alloys, Al-Zn-Mg alloys, and Al-Fe alloys can be used. The aluminum content in the Al alloy is preferably 95% by mass or higher.

[0113] Among these, aluminum foil or SUS foil is preferred as the metal foil, and aluminum foil that is lightweight and has excellent elongation is particularly preferred. Aluminum foil containing 0.1% to 3.0% by mass of iron (alloy number 8000 series) or pure aluminum with a purity of 99% or more (alloy number 1000 series) is preferred. In the aluminum foil containing 0.1% to 3.0% by mass of iron, if the iron content is less than this range, the elongation tends to be insufficient, and if it is more than this range, the metal foil tends to corrode easily. The iron content of the iron-containing aluminum foil is preferably 0.2% to 1.7% by mass, and particularly preferably 0.3% to 1.7% by mass. Furthermore, there are hard aluminum foils and soft aluminum foils, but soft aluminum foils that have been annealed are preferred because they have flexibility.

[0114] The thickness of the metal foil such as aluminum foil is preferably 6 μm or more and 100 μm or less, particularly 9 μm or more and 60 μm or less, in order to achieve both a thin film and good barrier properties.

[0115] <Surface treatment of aluminum foil> The surface of the aluminum foil suitable as the metal foil in the present invention may be subjected to a surface treatment to impart corrosion resistance. However, in the present invention, surface treatment of the aluminum foil is not necessarily required.

[0116] When surface-treating aluminum foil, known treatments are used. Examples include chromium-based conversion treatments such as chromate chromate treatment, phosphate chromate treatment, phosphate-chromate treatment, chromate treatment, alkali chromate treatment, and coating-type chromate treatment; coating-type non-chromium-based treatments such as zirconium, titanium, and zinc phosphate; boehmite treatment; and anodizing treatment. In addition to these treatments, treatments such as corona treatment, plasma treatment, flame treatment, and primer treatment to impart polar groups to the aluminum foil surface may be used to enhance adhesion to the adhesive layer made of a thermoplastic thermal adhesive resin, thereby imparting corrosion resistance. Two or more of these treatments may also be combined. However, from an environmental perspective, it is preferable not to use chromium-based conversion treatments.

[0117] [Protective layer] The anticorrosion laminate film of the present invention may further have a coating layer, a high-elasticity resin layer, or a low-elasticity resin layer containing a weathering agent as a protective layer to improve weather resistance, etc. It is preferable that the protective layer contains a weathering agent to provide better weather resistance. In particular, it is preferable to have a highly elastic resin layer as a protective layer in order to increase the mechanical strength of the anticorrosion laminate film.

[0118] <High elasticity resin layer> The anticorrosion laminate film of the present invention may be provided with a highly elastic resin layer as a protective layer to prevent damage due to external forces such as punctures, and to prevent damage to the film itself due to external physical stress.

[0119] The highly elastic resin layer is required to have excellent mechanical strength, excellent protection of the metal foil, and barrier properties, and is preferably made of a resin film having a relatively high tensile modulus of elasticity, since this allows the film thickness to be reduced.

[0120] Examples of resins that may be used to form the highly elastic resin layer include polyamide (PA or Ny), polyamideimide (PAI), polyacetal (POM), polyarylate (Par), polycarbonate (PC), polyalkylene terephthalates (PAT) such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polytrimethylene terephthalate (PTT), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), polymethyl methacrylate (PMMA), polyphenylene oxide (PPE), polyethersulfone (PES), polymethylpentene (TPX), polyoxybenzylene (POB), polyimide (PI), liquid crystalline polyester, polysulfone (PSF), polyphenylene sulfide (PPS), polybisamidotriazole, polyaminobismaleimide, polyetherimide (PEI), and polyetheretherketone (PEEK), as well as mixtures of two or more of these. Among these, those made of polycarbonate (PC), polybutylene terephthalate (PBT), polyalkylene terephthalate (PAT) such as polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polybutylene naphthalate (PBN), polyamide (PA or Ny), polyphenylene sulfide (PPS), polyamideimide (PAI), and polyimide (PI) are preferred.

[0121] The high-elasticity resin layer may be a non-stretched film or a stretched film, but from the viewpoint of mechanical strength and heat resistance, the high-elasticity resin layer is preferably made of a stretched film, and more preferably a biaxially stretched film. In particular, those made of a biaxially stretched polyethylene terephthalate film, a biaxially stretched polyethylene naphthalate film, a biaxially stretched polyamide film, or a biaxially stretched polybutylene terephthalate film are preferred because they have a moderately high tensile modulus and are inexpensive.

[0122] Among these, biaxially oriented polyamide films and biaxially oriented polybutylene terephthalate films are more preferable because they also have a suitable degree of flexibility. Furthermore, biaxially oriented polyamide films and biaxially oriented polybutylene terephthalate films produced by the tubular method are particularly preferred, with biaxially oriented polyamide films being particularly preferred, as they have little anisotropy in the film direction (longitudinal direction, width direction).

[0123] The highly elastic resin layer must also play a role in preventing pinholes and cracks from occurring in the metal foil due to deformation caused by external punctures, etc., and must have a certain degree of elasticity and thickness to prevent damage to the anticorrosion laminate film during installation. From this viewpoint, it is preferable that the tensile modulus of the high-elasticity resin layer is 1500 MPa or more, particularly 1700 MPa or more, and especially 2000 MPa or more, as the maximum value in the plane of the film (usually either in the extrusion direction (longitudinal direction) or width direction of the film). If the tensile modulus of elasticity of the high-elasticity resin layer is less than 1500 MPa, the effect of reinforcing the metal foil tends to be reduced, and pinholes and cracks tend to be more likely to occur due to external stress.

[0124] Although there is no particular upper limit for the tensile modulus of the high-elasticity resin layer, the maximum value within the film plane is preferably 6500 MPa or less. If the tensile modulus is greater than this, the anticorrosion laminate film of the present invention becomes too hard and loses flexibility, so the thickness must be reduced, which may result in poor pinhole resistance and puncture resistance. In addition, when the anticorrosion laminate film is bent and attached to a corner or the like, the return force increases over time, which may cause peeling. The upper limit of the tensile modulus of elasticity of the high-elasticity resin layer is more preferably 5000 MPa or less, and particularly preferably 4500 MPa or less.

[0125] The thickness of the high-elasticity resin layer is preferably 5 μm or more and 50 μm or less. If the thickness of the high-elasticity resin layer is thicker than 50 μm, the corrosion-protective laminate film of the present invention becomes too rigid, making it difficult to bend and difficult to attach to the corners of steel materials, making installation difficult, and the surface density tends to increase, making it difficult to achieve weight reduction. On the other hand, if the thickness of the high-elasticity resin layer is thinner than 5 μm, puncture resistance may be affected. The thickness of the high-elasticity resin layer is particularly preferably 8 μm or more and 30 μm or less. Here, the thickness of the high-elasticity resin layer refers to the thickness of one high-elasticity resin layer (per location). Here, one high-elasticity resin layer refers to a layer that does not include an adhesive layer, for example, a layer between adhesive layers. If one high-elasticity resin layer has a laminated structure of multiple layers, it corresponds to the total thickness of the layers.

[0126] In particular, when improving the puncture resistance of the anticorrosion laminate film, it is preferable to provide the highly elastic resin layer on the outermost layer side of the metal foil, that is, on the opposite side of the metal foil from the material to be protected.

[0127] [Light stabilizer] The anticorrosion laminate film of the present invention preferably has a layer containing a light stabilizer (radical scavenger) to improve light resistance and weather resistance. The light stabilizer may be contained in the adhesive layer, or in a protective layer such as an ultraviolet ray shielding layer or a highly elastic resin layer. The light stabilizer is preferably contained in one or both of the adhesive layer and the ultraviolet ray shielding layer, and more preferably in both the adhesive layer and the ultraviolet ray shielding layer. In particular, the light stabilizer is preferably contained in the outermost layer side of the metal foil, i.e., in a layer provided on the opposite side of the metal foil from the protected material.

[0128] Although there are no particular limitations on the light stabilizer, a hindered amine light stabilizer (commonly referred to as HALS) is preferred, and a polymeric hindered amine light stabilizer is particularly preferred because of its excellent bleeding resistance. When an acid-modified PE resin, PE resin, or PP resin is used in the UV-shielding layer or adhesive layer, among the polymeric hindered amine light stabilizers, a polymeric hindered amine light stabilizer copolymerized with ethylene is preferred because it can significantly improve long-term weather resistance.

[0129] When a light stabilizer is incorporated into the ultraviolet shading layer, adhesive layer, or protective layer, there are no particular restrictions on the amount of the stabilizer incorporated; however, it is preferable that the content in the ultraviolet shading layer, adhesive layer, or protective layer be 0.01 mass % or more and 10 mass % or less from the viewpoint of weather resistance and waterproofing and corrosion resistance as an anticorrosion laminate film. A known ultraviolet absorber may be used in combination with the light stabilizer. As the light stabilizer, commercially available products can be used, such as the Tinuvin Chimassorb (trade name) series manufactured by BASF, the Adekastab (trade name) series manufactured by ADEKA, and KOKANOX (manufactured by Japan Polyethylene Corporation), and any of the above-mentioned products can be appropriately selected and used.

[0130] [Layer structure of anticorrosion laminate film] The anticorrosion laminate film of the present invention includes at least an ultraviolet ray-shielding layer and a metal foil, and may have the ultraviolet ray-shielding layer laminated on one or both sides of the metal foil via an adhesive layer made of a thermoplastic heat-adhesive resin. In the anticorrosion laminate film of the present invention, there are no particular restrictions on the configuration of layers other than the metal foil and the ultraviolet ray-shielding layer.

[0131] For example, as shown in FIG. 1, an anticorrosion laminate film 10 (10A) may be formed by laminating ultraviolet light-shielding layers 1 (1a, 1b) on both sides of a metal foil 3 via adhesive layers 2 (2a, 2b).

[0132] As shown in FIG. 2, a highly elastic resin layer 4 and an ultraviolet ray shielding layer 1 (1a) may be laminated on both sides of a metal foil 3 via adhesive layers 2 (2a, 2b), and then an ultraviolet ray shielding layer (1b, 1c) may be laminated on the both sides via adhesive layers (2c, 2d) to form a corrosion-resistant laminate film 10 (10B).

[0133] Furthermore, as shown in FIG. 3, it may be an anticorrosion laminate film 10 (10C) in which an ultraviolet ray shielding layer 1 is laminated on only one surface of a metal foil 3 via an adhesive layer 2.

[0134] In either case, it is preferable to have at least one adhesive layer 2 on the outermost surface of the metal foil 4, which is the surface opposite to the surface that is adhered to the protected material, from the standpoint of long-term durability and weather resistance, but the adhesive layer 2 may also be attached to the surface that is adhered to the protected material.

[0135] In the anticorrosion laminate film of the present invention, the adhesive layer, metal foil, high-elasticity resin layer, and ultraviolet ray-shielding layer may each be within the preferred thickness ranges described above, and there are no particular restrictions on their total thickness. However, in order to ensure the necessary thickness of each layer and effectively obtain each function, the lower limit of the total thickness of the anticorrosion laminate film of the present invention is preferably 50 μm or more, more preferably 75 μm or more, and particularly preferably 80 μm or more, as this makes it less likely to tear. On the other hand, in order to prevent the anticorrosion laminate film from becoming excessively thick and becoming highly rigid, which would impair workability, etc., the upper limit of the total thickness of the anticorrosion laminate film of the present invention is preferably 300 μm or less, and more preferably 250 μm or less.

[0136] [Other Processing] The outermost surface of the anticorrosive laminate film (the surface opposite to the surface to which the steel or other material to be protected is attached) may be painted (not shown) or coated to enhance the anticorrosive effect. For example, a weather-resistant coating layer may be formed to improve water resistance and weather resistance. Furthermore, in order to improve wettability with adhesives or glues used for attaching to materials to be protected such as paint or steel, the surface may be subjected to a surface treatment that results in a contact angle with water of 70° or more and 120° or less.

[0137] Furthermore, when a paint is sprayed on the outside of the anticorrosion laminate film or when an adhesive is applied to the inside, solvent resistance is required, so it is preferable to provide a hydrophobic ultraviolet ray-shielding layer with excellent solvent resistance, but good surface wettability is also important. For this reason, a primer may be applied, or as mentioned above, the surface of the ultraviolet ray-shielding layer may be made uneven, or the surface of the outermost layer of the anticorrosion laminate film may be subjected to a surface treatment such as corona discharge treatment, plasma treatment, or flame treatment to improve adhesion to the adhesive or paint.

[0138] On the other hand, since the UV-shielding layer contains pigments, the surface is uneven, which tends to have a favorable effect on adhesion; however, making the surface more uneven rather than wettable can suppress a phenomenon known as blocking, which occurs when films stick to each other after various corona treatments or plasma treatments to impart adhesion to surface paints, coatings, and adhesives, and can be preferable in terms of workability and adhesion to adhesives, glues, and paints.

[0139] The surface roughness Ra of the anticorrosive laminate film of the present invention is preferably 0.03 to 1.2 μm, and particularly preferably 0.12 to 0.8 μm. It is also possible to share appropriate wettability and appropriate unevenness in an appropriate combination.

[0140] [Method for manufacturing anticorrosive laminate film] The method for producing the anticorrosion laminate film of the present invention is not particularly limited, but at least for laminating the metal foil and the adhesive layer, the adhesive layer can be formed into a film in advance by a T-die molding method or an inflation molding method, and then the metal foil and the formed adhesive layer can be heated and bonded together by a thermal lamination method, or the adhesive layer can be directly attached to the metal foil by an extrusion lamination method. In addition, when bonding the ultraviolet ray shielding layer to the metal foil via an adhesive layer, the ultraviolet ray shielding layer and the adhesive layer can be co-extruded by inflation molding to form a laminated film, and then heated and bonded by a thermal lamination method so that the adhesive layer side of the laminated film overlaps the metal foil, or a method of bonding the ultraviolet ray shielding layer directly to the metal foil using a heat-melted adhesive layer material by a sand lamination method in which a heat-melted adhesive layer material is extruded and laminated between a previously formed ultraviolet ray shielding layer and a metal foil, and the like is preferred. A particularly preferred manufacturing method is a method in which the ultraviolet ray-shielding layer and the adhesive layer are formed into a laminated film by co-extrusion inflation molding, and then the laminated film is heated and bonded to the metal foil by thermal lamination so that the adhesive layer of the laminated film overlaps the metal foil. This method is preferred because it is excellent in the film formation stability of the ultraviolet ray-shielding layer and the film formation efficiency of the laminated film, and also because it can achieve high adhesion due to the adhesive layer.

[0141] [Anti-corrosion tape] The anticorrosion laminate film of the present invention can be coated with a pressure-sensitive adhesive or adhesive to form an anticorrosion tape, or a so-called double-sided tape, which is a film or sheet-like material impregnated with a pressure-sensitive adhesive, can be attached to the anticorrosion laminate film of the present invention to form an anticorrosion tape. Such a configuration can improve the long-term water resistance, durability, and ease of application of the anticorrosion tape.

[0142] In this case, it is preferable to use an adhesive that has a moderately low adhesive strength, particularly at the initial stage of lamination, and that improves adhesive strength after hardening due to humidity, as an anticorrosion tape and to adhere it to the anticorrosion laminate film of the present invention, which is the anticorrosion substrate. In addition, the anticorrosion laminate film must have appropriate elasticity and thickness to absorb the uneven surfaces of the material to be protected, such as steel, and to alleviate stresses applied during lamination and stresses from external impacts, thereby preventing damage to the anticorrosion laminate film over the long term. However, if the adhesive layer is too thick, it will take a long time to harden after bonding. If the tape is left in a sticky, soft state after being stuck together, it may slip off due to external forces. From this perspective, it is preferable to stick a double-sided tape made of a base material such as paper, nonwoven fabric, cotton fabric, polyethylene, or acrylic foam coated with or impregnated with an acrylic adhesive to an anticorrosion laminate film and use it as an anticorrosion tape, as this allows the thickness of the adhesive layer to be made thinner while the thickness of the adhesive layer as a whole to be made thicker, thereby achieving both unevenness absorption and appropriate adhesive hardening properties.

[0143] Figures 1 to 3 show anti-corrosion tapes 20 (20A, 20B, 20C) each made by adhering release paper or film 6 to anti-corrosion laminate films 10 (10A, 10B, 10C) using an adhesive layer 5 made of a moisture-curing adhesive (including double-sided tape in which the adhesive is applied to both sides of the substrate).

[0144] The thickness of the adhesive layer 5 or the substrate of the double-sided tape is preferably 0.1 mm or more and 2 mm or less, and the thickness of the adhesive layer is preferably 0.1 mm or less. If the thickness is greater than these, flexibility may be lost and application may be impaired. On the other hand, if the thickness is thinner than these, conformability to the unevenness of the adherend (the protected material) may be impaired and adhesive strength may be insufficient. The thickness of the adhesive layer 5 or the substrate of the double-sided tape is more preferably 0.15 mm or more and 1.5 mm or less, and particularly preferably 0.20 mm or more and 1.2 mm or less.

[0145] The modulus of elasticity of the adhesive layer 5 or double-sided tape should also be appropriately low, and it is preferable to use an adhesive double-sided tape in which an acrylic adhesive is applied to an acrylic foam substrate having a tensile modulus of elasticity of 100 MPa or less. [Example]

[0146] The present invention will be explained in more detail below by way of examples, but the present invention is not limited to the following examples as long as it does not depart from the gist of the invention.

[0147] [Evaluation method] The materials used in the following examples and comparative examples, and the methods for evaluating the produced anticorrosion laminate films and anticorrosion tapes are as follows.

[0148] <Average UV transmittance> The average ultraviolet transmittance of the ultraviolet shading layer was measured using a SHIMADZU UV-3150 manufactured by Shimadzu Corporation, with a sample 5 cm long and 4 cm wide, a slit width of 8 nm, and the transmittance measured at 1.0 nm intervals over a wavelength range of 200 nm to 800 nm at a medium scanning speed. The average value for wavelengths between 250 nm and 350 nm was calculated and used as the average ultraviolet transmittance.

[0149] <Contact angle with water> The contact angle of the sample surface with water was measured using an automatic contact angle meter (product name: DROPMASTER, manufactured by Kyowa Interface Science Co., Ltd.), and the average value of the measurements at five points was used.

[0150] <Surface roughness> Using a Keyence Corporation ultra-deep profile measuring microscope (trade name: VK8500), the surface roughness Ra of a 40 μm x 40 μm area was measured at four points under the measurement conditions of 100x lens, 0.01 μm pitch, AUTO shutter speed, and 835 gain, and the average value was used as the measured surface roughness.

[0151] <Tensile modulus> The tensile modulus of a resin or resin composition is a value measured on a 15 mm wide strip film sample at a chuck distance of 100 mm using a Tensilon type tensile tester at 1 mm / min in accordance with ISO1184-1970.

[0152] <Tensile elongation at break> The tensile elongation at break of a film is the value expressed in % when a 15 mm wide strip of film sample is measured at 100 mm / min with a Tensilon type tensile tester with a chuck distance of 100 mm, based on ISO1184-1970.

[0153] <MFR(メルトフローレート)> Acid-modified LLPE, LLPE, HDPE, and LDPE were measured at 190°C and a load of 2.16 kgf according to the JISK 7210A method.

[0154] <density> The values ​​for acid-modified LLPE, LLPE, HDPE, and LDPE were determined using the JIS K7112A method (water displacement method).

[0155] <Melting point> Based on DSC (differential scanning calorimetry) measurement. Using SSC-5200 (trade name) manufactured by Seiko Instruments Inc., the sample was heated at a heating rate of 10°C / min, and the peak temperature of crystal melting was taken as the melting point.

[0156] <Adhesion strength between metal foil and adhesive layer> The anticorrosion laminate film was cut into a 15mm x 50mm piece, and the metal foil and adhesive layer were peeled off by 20mm to prepare a test piece. A T-peel test was performed using an Imada tensile tester, peeling the interface between the metal foil and adhesive layer for a length of 30mm at a tensile speed of 50mm / min, and the minimum value was used as the measured adhesive strength. The average of the minimum values ​​for three samples was used as the measurement result.

[0157] <Accelerated hot water resistance test> A pressure cooker test was conducted as an accelerated test for the humidity resistance of anticorrosion laminate films. A high-temperature, high-density steam environment was created in the test tank, and the anticorrosion laminate film was left at 120°C and 100% humidity for 240 hours (equivalent to 15 years of exposure at 40°C and 90% humidity), after which the film was removed. After this accelerated hot water resistance test, the tensile elongation at break was measured and compared with the measurement value before the accelerated hot water resistance test to determine long-term water resistance.

[0158] <Accelerated weather resistance test> Using a Suga Test Instruments SX75 (product name) Super Xenon Weather Meter, in accordance with JIS K7350-2, a corrosion-resistant laminate film was used as a daylight filter, 180W / m 2 The film was then removed after 300 hours of exposure at 60°C in a cycle mode with 18 minutes of rainfall out of a total of 120 minutes (equivalent to approximately 8 months of outdoor exposure). After this accelerated weathering test, the tensile elongation at break was measured and compared with the measurement value before the accelerated weathering test to determine long-term weathering resistance. Furthermore, a long-life test up to 5000 hours was conducted to observe the time until delamination of the laminate film occurred.

[0159] <Comprehensive evaluation of anticorrosion laminate film> The overall evaluation of the anticorrosion laminate film was judged according to the following criteria. ◯: Both the tensile breaking elongation after the accelerated hot water resistance test and the tensile breaking elongation after the accelerated weather resistance test are maintained at 80% or more of the tensile breaking elongation before the test. △: Both the tensile breaking elongation after the accelerated hot water resistance test and the tensile breaking elongation after the accelerated weather resistance test are 20% or more and less than 80% of the tensile breaking elongation before the test. ×: Both the tensile breaking elongation after the accelerated hot water resistance test and the tensile breaking elongation after the accelerated weather resistance test are less than 20% of the tensile breaking elongation before the test.

[0160] <Tape peel strength> Anticorrosion tape was applied to a 0.1 mm thick SUS430 sheet, and the peel strength of the sample was measured using the 180° peel strength test method after it had been left at 23°C and 50% humidity for 24 hours (initial), and after conditioning at 45°C and 75% humidity for 20 hours and then left at 23°C and 50% humidity for 48 hours (humidity cured) to evaluate its humidity curability. Specifically, test pieces cut into 15 mm wide strips were used from each sample, and the interface between the SUS sheet and the adhesive side of the corrosion protection tape was measured using an Orientec tensile testing machine "STA1225" at a pulling speed of 50 mm / min while peeling for 1 cm, and the maximum load during this peeling was taken as the peel strength.

[0161] <Super xenon long life test> In a long-life test of Super Xenon, the time to delamination was investigated. The relationship between the time until delamination in this long life test and the expected life is as follows: Time until delamination: 4000 hours = Lifespan: Equivalent to over 8 years Time until delamination: 2500 hours = Lifespan: 5 years Time until delamination: 2000 hours = Lifespan: 4 years Time until delamination: 1500 hours = Lifespan: 3 years Time until delamination: 500 hours = Lifespan: 1 year

[0162] <Overall evaluation of anticorrosion tape> The overall evaluation of the anticorrosion tape was judged according to the following criteria. Good: The value obtained by dividing the peel strength after humidity curing by the initial peel strength is more than 1.2 times, and the time until delamination in the long-life test is 4000 hours or more. △: The value obtained by dividing the peel strength after humidity curing by the initial peel strength exceeds 1.2 times, but the time until delamination in the long-life test is 1000 hours or more but less than 4000 hours. ×: Neither ○ nor △ above is satisfied.

[0163] [Physical properties of resin] In the examples and comparative examples, the properties of the resins used in the adhesive layer, high elasticity resin layer, ultraviolet light shielding layer or low elasticity resin layer are as shown in Table 1 below.

[0164] [Table 1]

[0165] [Materials of each layer] The constituent materials of each layer used in the production of the anticorrosion laminate film and anticorrosion tape in the Examples and Comparative Examples are as follows.

[0166] <High elasticity resin layer> Ny-15: Biaxially stretched polyamide (Ny) film produced by the tubular method (thickness: 15 μm, tensile modulus: 2300 MPa, surface roughness Ra: 0.04 μm, double-sided corona treatment)

[0167] <Adhesive layer> Acid-modified PE-15: An inflation film (thickness: 15 μm) made from acid-modified PE blended at a ratio of 90% by mass of acid-modified LLPE and 10% by mass of LDPE, with a light stabilizer concentration of 1% by mass.

[0168] <Light stabilizer> Polymeric hindered amine light stabilizers copolymerized with ethylene

[0169] <Pigments> Carbon black: Carbon black with a primary particle diameter of 30 nm Titanium dioxide: SiO2 and Al2O3 coated titanium dioxide (primary particle size: 250nm)

[0170] <Metal foil> AL-25: Untreated JIS 1N30H-O material (soft aluminum foil containing 0.4% iron by mass) with a thickness of 25 μm

[0171] <Double-sided tape> Double-sided tape A: Double-sided tape made of acrylic foam with a thickness of 0.15 mm and coated with an acrylic adhesive (3M VHB tape, product name Y4914, tensile modulus: 10 MPa or less) Double-sided tape B: Double-sided tape made of acrylic foam with a thickness of 0.25 mm and coated with an acrylic adhesive (3M VHB tape, product name Y4914, tensile modulus: 10 MPa or less)

[0172] [Example 1] <Preparation of film for bonding the surface side and the protected material side> The material used for the UV-shielding layer was a blend of 94 parts by mass of PE (70% by mass of LLPE, 20% by mass of HDPE, and 10% by mass of LDPE), 0.2 parts by mass of carbon black, and 5.8 parts by mass of titanium oxide, with a light stabilizer concentration of 1% by mass. The adhesive layer material used was an acid-modified PE blended at a ratio of 90% by mass of acid-modified LLPE and 10% by mass of LDPE, to which a light stabilizer was added so as to have a concentration of 1% by mass. The materials for the ultraviolet light-shielding layer and the adhesive layer were co-extruded by inflation molding to form a film, to obtain the following two-layer film IA. The average UV transmittance of the adhesive layer at wavelengths of 250 nm to 350 nm was measured on a film formed by inflation molding only the adhesive layer material in the same manner as above to the same thickness as the adhesive layer in the two-layer film, and was 90%. In the following examples and comparative examples, the average UV transmittance of the adhesive layer was measured in the same manner. Total thickness: 50 μm Adhesive layer [acid-modified PE-12] (acid-modified LLPE + LDPE layer) thickness: 12 μm UV-shielding layer [PE-A38] (LLPE + HDPE + LDPE layer) thickness: 38 μm Average UV transmittance for wavelengths between 250nm and 350nm: 3.3% (The average UV transmittance of [acid-modified PE-12] is 90%)

[0173] <Production of anticorrosion laminate film> Two-layer film IA was bonded to both sides of AL-25 using thermal lamination, with the acid-modified LLPE+LDPE layer side of the adhesive layer facing the AL-25 side, to obtain a five-layer laminated film with a total thickness of 125 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film was Ra 0.45 μm on both sides. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosion laminated film with a water contact angle of 107° on the plasma-treated surface on the ultraviolet light-shielding layer side and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosion laminate film was 12 N / 15 mm on the surface to be bonded to the front side, and 12 N / 15 mm on the surface to be bonded to the material to be protected.

[0174] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape B was attached to this anticorrosion laminate film to form an anticorrosion tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 2.

[0175] [Example 2] <Preparation of films for bonding the surface side and the protected material side> The material used for the UV-shielding layer was a mixture of 93.8 parts by mass of PE (70% by mass of LLPE, 20% by mass of HDPE, and 10% by mass of LDPE), 0.4 parts by mass of carbon black, and 5.8 parts by mass of titanium oxide, with a light stabilizer concentration of 1% by mass. The adhesive layer material used was an acid-modified PE blended at a ratio of 90% by mass of acid-modified LLPE and 10% by mass of LDPE, to which a light stabilizer was added so as to have a concentration of 1% by mass. The material for the ultraviolet light shielding layer and the material for the adhesive layer were formed into a film by co-extrusion inflation molding to obtain the following two-layer film IB. Total thickness: 50 μm Adhesive layer [acid-modified PE-12] (acid-modified LLPE + LDPE layer) thickness: 12 μm UV-shielding layer [PE-B38] (LLPE+HDPE+LDPE layer) thickness: 38 μm Average UV transmittance for wavelengths between 250nm and 350nm: 4.5% (The average UV transmittance of [acid-modified PE-12] is 90%)

[0176] <Production of anticorrosion laminate film> Two-layer film IB was bonded to both sides of AL-25 by thermal lamination, with the acid-modified LLPE+LDPE layer side of the adhesive layer facing the AL-25 side, to obtain a five-layer laminated film with a total thickness of 125 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film was Ra 0.4 μm on both sides. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosion laminated film with a water contact angle of 107° and a surface roughness Ra of 0.4 μm on the plasma-treated surface of the LLPE layer side. The adhesive strength between the metal foil and adhesive layer of this anticorrosive laminate film was 11 N / 15 mm on both the surface to be bonded to the surface to be protected and the surface to be bonded to the material to be protected.

[0177] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape B was attached to this anticorrosion laminate film to form an anticorrosion tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 2.

[0178] [Example 3] <Preparation of films for bonding the surface side and the protected material side> The same materials as in Example 1 for the ultraviolet ray shielding layer and adhesive layer were used, except that the thicknesses were changed, and film formation was carried out by co-extrusion inflation molding to obtain the following two-layer film II-A. Total thickness: 80 μm Adhesive layer [acid-modified PE-20] (acid-modified LLPE + LDPE layer) thickness: 20 μm UV-shielding layer [PE-A60] (LLPE + HDPE + LDPE layer) thickness: 60 μm Average UV transmittance for wavelengths between 250nm and 350nm: 0.2% (The average UV transmittance of [acid-modified PE-20] is 90%)

[0179] <Production of anticorrosion laminate film> Two-layer film II-A was bonded to both sides of AL-25 using thermal lamination, with the acid-modified LLPE+LDPE layer side of the adhesive layer facing the AL-25 side, to obtain a five-layer laminated film with a total thickness of 185 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film was Ra 0.45 μm on both sides. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosion laminated film with a water contact angle of 99° on the plasma-treated surface on the ultraviolet light-shielding layer side and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosion laminate film was 12 N / 15 mm on the surface to be bonded to the front side, and 12 N / 15 mm on the surface to be bonded to the material to be protected.

[0180] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Double-sided tape B was applied to the surface of this anticorrosive laminate film facing the material to be protected to form an anticorrosive tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 2.

[0181] [Example 4] <Preparation of films for bonding the surface side and the protected material side> The same film was produced by coextrusion inflation molding in the same manner as in Example 2, except that the materials for the ultraviolet ray shielding layer and adhesive layer were used and the thicknesses were changed, to obtain the following two-layer film II-B. Total thickness: 80 μm Adhesive layer [acid-modified PE-20] (acid-modified LLPE + LDPE layer) thickness: 20 μm UV-shielding layer [PE-B60] (LLPE+HDPE+LDPE layer) thickness: 60 μm Average UV transmittance for wavelengths between 250nm and 350nm: 0.2% (The average UV transmittance of [acid-modified PE-20] is 90%)

[0182] <Production of anticorrosion laminate film> Two-layer film II-B was bonded to both sides of AL-25 using thermal lamination, with the acid-modified LLPE+LDPE layer side of the adhesive layer facing the AL-25 side, to obtain a five-layer laminated film with a total thickness of 185 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film was Ra 0.45 μm on both sides. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosion laminated film with a water contact angle of 108° on the plasma-treated surface on the ultraviolet light-shielding layer side and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosion laminate film was 12 N / 15 mm on the surface to be bonded to the front side, and 12 N / 15 mm on the surface to be bonded to the material to be protected.

[0183] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape B was attached to this anticorrosion laminate film to form an anticorrosion tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 2.

[0184] [Example 5] The two-layer film IA produced in Example 1 was used as the two-layer film consisting of the ultraviolet light-shielding layer and the adhesive layer. Two-layer film IA, Ny-15 corona-treated on both sides as the film for the high-elasticity resin layer, and acid-modified PE-15 as the film for the adhesive layer were used, and these were laminated to both sides of AL-25 using a thermal lamination method in the order of acid-modified PE-15, Ny-15, two-layer film 1-A (adhesive layer, UV-shielding layer), to obtain an eight-layer laminate film with a total thickness of 185 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film would be Ra: 0.45 μm. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosive laminated film with a water contact angle of 80° and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosive laminate film was 6 N / 15 mm on the surface to be bonded to the front side, and 6 N / 15 mm on the surface to be bonded to the material to be protected.

[0185] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape A was attached to this anticorrosive laminate film to form an anticorrosive tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 3.

[0186] [Example 6] The material used for the UV-shielding layer was a blend of 98.5 parts by mass of PE (70% by mass of LLPE, 20% by mass of HDPE, and 10% by mass of LDPE) and 1.5 parts by mass of titanium oxide, with a light stabilizer concentration of 1% by mass. The adhesive layer material used was an acid-modified PE blended at a ratio of 90% by mass of acid-modified LLPE and 10% by mass of LDPE, to which a light stabilizer was added so as to have a concentration of 1% by mass. The material for the ultraviolet light shielding layer and the material for the adhesive layer were formed into a film by co-extrusion inflation molding to obtain the following two-layer film IC. Total thickness: 50 μm Adhesive layer [acid-modified PE-12] (acid-modified LLPE + LDPE layer) thickness: 12 μm UV-shielding layer [PE-C38] (LLPE+HDPE+LDPE layer) thickness: 38 μm Average UV transmittance for wavelengths between 250nm and 350nm: 38.3% (The average UV transmittance of [acid-modified PE-12] is 90%)

[0187] Two-layer film IC, Ny-15 corona-treated on both sides as the film for the high-elasticity resin layer, and acid-modified PE-15 as the film for the adhesive layer were used, and these were laminated to both sides of AL-25 using thermal lamination in the order of acid-modified PE-15, Ny-15, two-layer film IC (adhesive layer, UV-shielding layer), to obtain an eight-layer laminate film with a total thickness of 185 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film would be Ra: 0.45 μm. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosive laminated film with a water contact angle of 80° and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosive laminate film was 6 N / 15 mm on the surface to be bonded to the front side, and 6 N / 15 mm on the surface to be bonded to the material to be protected.

[0188] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape A was attached to this anticorrosive laminate film to form an anticorrosive tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 3.

[0189] [Example 7] The material used for the UV-shielding layer was a mixture of 98 parts by mass of PE (70% by mass of LLPE, 20% by mass of HDPE, and 10% by mass of LDPE), 0.2 parts by mass of carbon black, and 1.8 parts by mass of titanium oxide, with a light stabilizer concentration of 1% by mass. The adhesive layer material used was an acid-modified PE blended at a ratio of 90% by mass of acid-modified LLPE and 10% by mass of LDPE, to which a light stabilizer was added so as to have a concentration of 1% by mass. The material for the ultraviolet light shielding layer and the material for the adhesive layer were formed into a film by co-extrusion inflation molding to obtain the following two-layer film ID. Total thickness: 50 μm Adhesive layer [acid-modified PE-12] (acid-modified LLPE + LDPE layer) thickness: 12 μm UV-shielding layer [PE-D38] (LLPE+HDPE+LDPE layer) thickness: 38 μm Average UV transmittance for wavelengths between 250nm and 350nm: 8.6% (The average UV transmittance of [acid-modified PE-12] is 90%)

[0190] Using two-layer film ID, Ny-15 corona-treated on both sides as the film for the high-elasticity resin layer, and acid-modified PE-15 as the film for the adhesive layer, the films were laminated to both sides of AL-25 using thermal lamination in the order of acid-modified PE-15, Ny-15, two-layer film ID (adhesive layer, UV-shielding layer), to obtain an eight-layer laminate film with a total thickness of 185 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film was Ra: 0.45 μm. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosive laminated film with a water contact angle of 80° and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosive laminate film was 6 N / 15 mm on the surface to be bonded to the front side, and 6 N / 15 mm on the surface to be bonded to the material to be protected.

[0191] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape A was attached to this anticorrosive laminate film to form an anticorrosive tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 3.

[0192] [Comparative Example 1] The material used for the pigment-free low-elasticity resin layer was a PE blend of 70% by mass of LLPE, 20% by mass of HDPE, and 10% by mass of LDPE, with a light stabilizer concentration of 1% by mass. The adhesive layer material used was an acid-modified PE blended at a ratio of 90% by mass of acid-modified LLPE and 10% by mass of LDPE, to which a light stabilizer was added so as to have a concentration of 1% by mass. The material for the low elasticity resin layer and the material for the adhesive layer were formed into a film by co-extrusion inflation molding to obtain the following two-layer film IE without an ultraviolet light-shielding layer. Total thickness: 50 μm Adhesive layer [acid-modified PE-12] (acid-modified LLPE + LDPE layer) thickness: 12 μm Low-elasticity resin layer [PE-38] (LLPE + HDPE + LDPE layer) thickness: 38 μm Average UV transmittance for wavelengths between 250nm and 350nm: 88.9% (The average UV transmittance of [acid-modified PE-12] is 90%)

[0193] <Production of anticorrosion laminate film> Two-layer films IE were bonded to both sides of AL-25 using thermal lamination, with the acid-modified LLPE+LDPE layer side of the adhesive layer facing the AL-25 side, to obtain a five-layer laminated film with a total thickness of 125 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film was Ra 0.45 μm on both sides. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosion laminated film with a water contact angle of 80° on the plasma-treated surface on the ultraviolet light shielding layer side and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosion laminate film was 12 N / 15 mm on the surface to be bonded to the front side, and 12 N / 15 mm on the surface to be bonded to the material to be protected.

[0194] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape B was attached to this anticorrosion laminate film to form an anticorrosion tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 3.

[0195] Comparative Example 2 The two-layer film IE produced in Comparative Example 1, Ny-15 corona-treated on both sides as the film for the high-elasticity resin layer, and acid-modified PE-15 as the film for the adhesive layer were bonded to both sides of AL-25 using a thermal lamination method in the order of acid-modified PE-15, Ny-15, two-layer film IE (adhesive layer, low-elasticity resin layer), to obtain an eight-layer laminate film with a total thickness of 185 μm. The surface roughness of the roll and release film during thermal lamination was adjusted so that the surface roughness of this laminated film would be Ra: 0.45 μm. Both sides of this laminated film were subjected to plasma treatment to produce an anticorrosive laminated film with a water contact angle of 80° and a surface roughness Ra of 0.45 μm. The adhesive strength between the metal foil and adhesive layer of this anticorrosive laminate film was 6 N / 15 mm on the surface to be bonded to the front side, and 6 N / 15 mm on the surface to be bonded to the material to be protected.

[0196] This anticorrosion laminate film was subjected to an accelerated hot water resistance test and an accelerated weather resistance test, and the tensile elongation at break was measured before and after the tests. Furthermore, double-sided tape A was attached to this anticorrosive laminate film to form an anticorrosive tape, and the tape peel strength was measured and a long life test was carried out. These results are shown in Table 3.

[0197] Tables 2 and 3 show the average UV transmittance of the two-layer film for wavelengths of 250 nm to 350 nm, but as mentioned above, the average UV transmittance of [Acid-modified PE-12] and [Acid-modified PE-20] for wavelengths of 250 nm to 350 nm is 90%, so it can be said that the average UV transmittance of the two-layer film is nearly equal to the average UV transmittance of the UV-shielding layer. Strictly speaking, the average UV transmittance of the UV-shielding layer is 1 / 0.9 times the average UV transmittance of the two-layer film.

[0198] [Table 2]

[0199] [Table 3]

[0200] [Consideration] From Tables 2 and 3, the following can be seen: In Examples 1 to 7, the ultraviolet ray shielding layer is disposed on the outermost layer side of the metal foil (the side opposite the protected material), thereby preventing a decrease in the adhesive strength between the thermoplastic thermal adhesive resin layer and the metal foil, and a corrosion-resistant laminate film with long-term weather resistance is obtained. In addition, by using a thermoplastic thermal adhesive resin for the adhesive layer and using materials containing a light stabilizer for the ultraviolet ray shielding layer and the thermoplastic thermal adhesive resin layer, and attaching them to at least the outermost layer side of the metal foil (the side opposite the protected material), a corrosion-resistant laminate film with weather resistance and waterproof properties that can withstand accelerated hot water resistance tests and accelerated weather resistance tests is obtained. Furthermore, in Examples 1 to 4, although polyolefin-based materials are used, a light stabilizer is incorporated into at least one layer, resulting in a weather-resistant, waterproof, and corrosion-resistant laminate film that can withstand accelerated hot water resistance tests and accelerated weather resistance tests.

[0201] In Examples 5, 6, and 7, a highly elastic resin layer is included, but an ultraviolet light-shielding layer is provided on the outside of it. Therefore, the laminate film is slightly more prone to interlayer delamination than in Examples 1 to 4. However, a weather-resistant, waterproof, and corrosion-resistant laminate film capable of withstanding accelerated hot water resistance tests and accelerated weather resistance tests is obtained.

[0202] In contrast, in Comparative Examples 1 and 2, although light stabilizers were incorporated into each layer, no UV-shielding layer was provided, so the bond between the metal foil and adhesive layer was easily broken, and the self-formation of oxide and hydroxide films on the surface of the metal foil in the presence of water and oxygen further weakened the bonding strength between the adhesive resin and the metal foil.Although the film appeared to withstand accelerated hot water resistance tests and accelerated weather resistance tests, it was unable to withstand long-term weather resistance tests, and interlayer delamination occurred after 500 hours (equivalent to one year). [Explanation of symbols]

[0203] 1(1a,1b,1c) UV shielding layer 2(2a,2b,2c,2d) Adhesive layer 3 Metal foil 4 High elastic resin layer 5 Adhesive layer 6 Release paper or release film 10(10A, 10B, 10C) Anticorrosive laminate film 20(20A, 20B, 20C) Anti-corrosion tape

Claims

1. A corrosion-preventing laminate film comprising a metal foil and an ultraviolet light-shielding layer containing one or both of carbon black and titanium oxide.

2. A corrosion-preventing laminate film comprising a metal foil and an ultraviolet ray-shielding layer, wherein the ultraviolet ray-shielding layer has an average ultraviolet ray transmittance of 50% or less for wavelengths of 250 nm or more and 350 nm or less.

3. 3. The anticorrosion laminate film according to claim 1, wherein the ultraviolet light-shielding layer is a layer containing a resin.

4. 2. The anticorrosion laminate film according to claim 1, wherein the ultraviolet ray shielding layer contains carbon black, and the content of the carbon black is 0.05% by mass or more and 10% by mass or less relative to the ultraviolet ray shielding layer.

5. 2. The anticorrosion laminate film according to claim 1, wherein the ultraviolet ray shielding layer contains titanium oxide, and the titanium oxide content is 0.3 mass % or more and 20 mass % or less with respect to the ultraviolet ray shielding layer.

6. 3. The anticorrosion laminate film according to claim 1, further comprising an adhesive layer made of a thermoplastic resin between the metal foil and the ultraviolet light-shielding layer.

7. 3. The anticorrosion laminate film according to claim 1, wherein the ultraviolet ray shielding layer has a thickness of 10 μm or more and 100 μm or less.

8. The anticorrosion laminate film according to claim 6 , wherein one or both of the ultraviolet light-shielding layer and the adhesive layer contains a light stabilizer.

9. 2. The corrosion-resistant laminate film according to claim 1, wherein the surface of the titanium oxide has a radical generation control coating.

10. 9. The anticorrosion laminate film according to claim 8, wherein the light stabilizer is a polymeric hindered amine light stabilizer.

11. 3. The corrosion-preventing laminate film according to claim 1, wherein the metal foil is an aluminum foil or a stainless steel foil.

12. 3. The anticorrosion laminate film according to claim 1, wherein the metal foil has a thickness of 6 μm or more and 100 μm or less.

13. The corrosion-resistant laminate film according to claim 11, wherein the iron content of the aluminum foil is 0.3 mass% or more and 1.7 mass% or less.

14. 2. The anticorrosion laminate film according to claim 1, wherein the ultraviolet ray shielding layer has an average ultraviolet ray transmittance of 50% or less at wavelengths of 250 nm or more and 350 nm or less.

15. 3. A corrosion-preventing tape comprising the corrosion-preventing laminate film according to claim 1 or 2 and an adhesive layer provided on one surface of the corrosion-preventing laminate film.

16. The corrosion protection tape according to claim 15, wherein the adhesive layer is a moisture-curable adhesive layer.

17. The corrosion protection tape according to claim 15, wherein the adhesive layer is an adhesive layer made of an acrylic foam or nonwoven fabric substrate including an acrylic adhesive layer.

18. The anticorrosion tape according to claim 17, wherein the adhesive layer is a double-sided tape.

19. The corrosion protection tape according to claim 15 , further comprising the ultraviolet light-blocking layer on a surface opposite to the adhesive layer.

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