JP2012206430A - Laminated film - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a film that has a visible light transmission performance, a far infrared ray reflective performance, and a resistant scratch performance, and can be used outdoor for a long period of time.SOLUTION: The laminated film is characterized in that a metal layer, a carbon layer and a hard coat layer are sequentially formed on one side of the base material that includes the synthetic resin, and a UV resistance layer is formed on the other side of a base material.

Description

The present invention relates to a laminated film which is excellent in infrared reflection performance, abrasion resistance performance and ultraviolet cut performance and is suitable for agriculture.

  Agricultural films used for greenhouse cultivation, such as agricultural houses, efficiently incorporate sunlight (particularly visible light) necessary for plant growth, and reduce heating costs that occupy much of the cultivation costs in house cultivation. Therefore, it is necessary to reflect far-infrared rays that are heating heat and to improve heating efficiency. Also, in summer, agricultural houses raise the skirt of the covering material at high temperatures and humidity during the day, and adjust the temperature and humidity by lowering the skirt before the outdoor air temperature drops in the evening. Therefore, the agricultural film used as the covering material needs to have high scratch resistance so as not to be damaged by friction with the house support. Furthermore, since it is used outdoors for a long time, durability against ultraviolet rays is also required.

  However, there is no agricultural film with the required performance of the above-mentioned agricultural film, that is, excellent in visible light transmission performance and far-infrared reflection performance, and having durability such as scratch resistance and UV-cutting properties. It is.

For example, an agricultural covering material having a transmissivity of 80% or more in which a far infrared absorber is blended with a film made of a polyethylene / vinyl acetate copolymer has been proposed (see Patent Document 1). However, in this method, visible light necessary for plant growth is sufficiently transmitted, but far infrared rays as heating heat is absorbed and not reflected, so that a sufficient heat retaining effect cannot be obtained. Synthetic resins such as polyethylene / vinyl acetate copolymer are
Although excellent in scratch resistance, even when a weathering aid such as an ultraviolet absorber is added to the resin, the weather resistance is not sufficient, and it is estimated that the resin cannot withstand long-term outdoor use.

  Also, a durable reflective film in which a silver vapor deposition layer is formed on one side of a plastic film, a silver vapor deposition layer is protected on it, a corrosion prevention layer is formed to provide scratch resistance, and an ultraviolet cut layer is formed on the opposite surface A film has been proposed (Patent Document 2). However, although this method has weather resistance that can withstand outdoor use for a long time, it is difficult to express all of visible light transmission performance, far-infrared reflection performance, and abrasion resistance performance at a high level. For example, in order to improve the far-infrared reflection performance, it is necessary to increase the film thickness of the silver vapor deposition layer that reflects far-infrared light and to decrease the film thickness of the corrosion prevention layer that absorbs far-infrared light. However, in this case, the visible light transmission performance is lowered due to the thick silver deposition layer, and the abrasion resistance performance is lowered due to the thin corrosion prevention layer. On the other hand, when the silver vapor deposition layer is made thin in order to improve the visible light transmission performance, and the corrosion prevention layer is made thick in order to improve the abrasion resistance performance, the far infrared reflection performance is lowered.

JP-A-11-105215 JP 2002-122717 A

  In view of the background of such prior art, the present invention is intended to provide a film suitable for agriculture, exhibiting far-infrared reflection performance and abrasion resistance performance at a high level.

The present invention employs the following means in order to solve such problems. That is, the film of the present invention has the following configuration.
(1) A laminated film in which a metal layer / carbon layer / hard coat layer is formed in order on one side of a base material made of a synthetic resin, and an ultraviolet cut layer is formed on the other side surface of the base material.
(2) The laminated film, which is made of a cured resin.
(3) The laminated film according to any one of the above, wherein the hard coat layer has a thickness of 0.5 to 1 μm.
(4) The laminated film according to any one of the above, wherein the ultraviolet cut layer has an average of 50% or more blocking performance against ultraviolet electromagnetic waves having a wavelength of 280 to 400 nm.
(5) The laminated film according to any one of the above, wherein the metal layer has a multilayer structure comprising a far-infrared reflective layer mainly composed of silver and a dielectric layer.
(6) The laminated film according to any one of the above, wherein an undercoat layer is formed between a base material and the metal layer.
(7) The laminated film according to any one of the above, wherein the metal layer has a thickness of 5 to 20 nm, the carbon layer has a thickness of 1 to 20 nm, and the ultraviolet cut layer blocks 70% or more of electromagnetic waves having wavelengths of 315 to 400 nm at each wavelength.
(8) Any one of the above laminated films for agriculture.

  According to the present invention, it is possible to provide a film suitable for agriculture that exhibits all of visible light transmission performance, far-infrared reflection performance, and abrasion resistance performance at a high level and has weather resistance that can be used outdoors for a long period of time. it can.

  In the laminated film of the present invention, it is essential to sequentially form a metal layer / carbon layer / hard coat layer on one side of a base material made of a synthetic resin and to form an ultraviolet cut layer on the other side of the base material. The substrate used in the present invention is not particularly limited as long as it has excellent visible light transmission performance and weather resistance, but for example, polyethylene terephthalate, polycarbonate, acrylic, nylon and the like are preferable, and all are corona treatment, plasma treatment, A surface treatment such as saponification or an easily adhesive layer may be formed. The thickness of the base material is not particularly limited and may be properly selected depending on the application and the years of use, but it should be 10 to 150 μm from the viewpoint of handleability, mechanical strength, heat resistance, etc. when spread as an agricultural film. Is more preferable, and it is 20-100 micrometers.

  The metal layer expresses far-infrared reflection performance and is a layer containing a metal. About a metal layer, it is 1 type of metals, such as silver, copper, gold | metal | money etc. with high electrical conductivity among general metals from a viewpoint that far infrared reflective performance is excellent in the substance with high electrical conductivity, or this is included. It is preferable to use an alloy containing two or more of these metals. Among these, it is more preferable to use silver having the highest electrical conductivity for the metal layer. Furthermore, in order to suppress the corrosion of silver by sulfur, oxygen, etc. in the atmosphere, it is also a preferable usage mode that a metal having excellent corrosion resistance such as gold is mixed and alloyed. Although there is no restriction | limiting in particular in thickness, It is preferable to select suitably in the range of 5-20 nm in consideration of the far-infrared reflective performance and visible light transmission performance which are required. If the thickness is low, the visible light transmission performance shows a high value, but the far-infrared reflection performance decreases. On the other hand, if it is too thick, the transparency is lowered, and not only the visible light transmission performance necessary for plant growth is obtained, but also the amount of metal used is increased, which is not economical. The metal layer may have a single-layer structure of the above-described far-infrared reflective performance layer (hereinafter referred to as a far-infrared reflective layer), but a dielectric layer may be laminated on the far-infrared reflective layer, or a far-infrared reflective layer. A multilayer structure in which layers are sandwiched by dielectric layers may be used. The dielectric layer in the present invention is a layer made of a transparent dielectric material having a high refractive index, and examples thereof include metal oxides such as titanium oxide, zinc oxide, and tin-doped indium oxide (ITO). Forming these dielectric layers improves visible light transmission performance, which is preferable for plant growth. The thickness of the dielectric layer is preferably 10 to 100 nm, and more preferably 30 to 60 nm. If the thickness of the dielectric layer is small, the visible light transmission performance is not significantly improved. On the contrary, even if the layers are excessively laminated, not only the visible light transmission performance can be further improved, but it is economically undesirable. These metal layers can be formed using a known technique such as vacuum deposition, sputtering, or ion plating.

  Moreover, you may form an undercoat layer between a base material and a metal layer. It is preferable to form the undercoat layer because the scratch resistance as a laminated film is improved. The resin for forming the undercoat layer is not particularly limited as long as it is highly transparent and durable, for example, an acrylic resin, a urethane resin, a fluorine resin, a silicon resin, etc. Or it can be used as a mixture. These undercoat layers are applied by a known technique such as gravure coating, reverse roll coating, roll coating, dip coating, etc., dried, and then cured by irradiation with ultraviolet rays, electron beams, etc. as necessary. Can be formed. About the thickness of an undercoat layer, it is preferable that it is 0.5-5 micrometers, and it is more preferable that it is 1-3 micrometers. When the thickness of the undercoat layer is less than 0.5 μm, not only the surface of the substrate cannot be uniformly coated but also the effect of improving the scratch resistance cannot be obtained. On the other hand, even if the thickness exceeds 5 μm, no further improvement in scratch resistance is observed, which is not preferable because it is economically inferior.

  The carbon layer formed between the metal layer and the hard coat layer is a hard film mainly composed of carbon. Carbon materials having a regular structure such as diamond and graphite can be used, but those having an amorphous structure are preferred. By providing such a carbon layer, high scratch resistance can be obtained. Although a clear reason is unknown, it is considered to improve the adhesion between the inorganic metal layer and the organic hard coat layer. By improving the adhesion between the metal layer and the hard coat layer, it is possible to develop high scratch resistance with a thin hard coat layer. In other words, by thinning the hard coat layer that absorbs far-infrared light, it is possible to thin the metal layer that prevents the transmission of visible light, and the visible light transmission performance, far-infrared reflection performance, and abrasion resistance are expressed at a high level. can do. In addition, the carbon layer may be composed of carbon alone, but it is preferable to include elements such as nitrogen, hydrogen, and oxygen in accordance with the composition of the hard coat layer in consideration of adhesion to the hard coat layer. It is. The means for forming the carbon layer can be formed by an existing method such as a sputtering method or a chemical vapor deposition method, but it is preferable to form the carbon layer together with the metal layer by a sputtering method in terms of shortening the process and manufacturing cost. It is. The thickness of the carbon layer is preferably 1 to 20 nm, more preferably 1 to 10 nm, and further preferably 1 to 5 nm. Since the carbon layer is formed for the purpose of improving the adhesion between the metal layer and the hard coat layer and improving the scratch resistance, the effect becomes weak when the film thickness is small. Further, when the film thickness is large, the visible light transmission performance is lowered, and the scratch resistance tends to be lowered.

  In the present invention, it is essential to form a hard coat layer for the purpose of protecting the metal layer and the carbon layer formed on the substrate and imparting scratch resistance. A resin is preferable as the hard coat layer. As the resin, a resin having high transparency and durability (particularly scratch resistance) is preferable. For example, resins similar to the undercoat layer, such as acrylic resin, urethane resin, fluorine resin, and silicon resin, can be used alone or as a mixture. The hard coat layer is dried by applying a resin solution by a gravure coating method, reverse roll coating method, roll coating method, dip coating method or the like. The hard coat layer is preferably cross-linked with a resin. It can be crosslinked by irradiating with ultraviolet rays, electron beams or the like. Moreover, a crosslinking agent capable of reacting with a functional group of the polymer of the resin can be added and crosslinked by a chemical reaction. About the thickness of a layer, it is preferable that it is 0.5-3 micrometers, and it is more preferable that it is 0.5-1 micrometer. If the thickness of the hard coat layer is small, the required scratch resistance may not be obtained. In addition, the hard coat layer cannot uniformly coat the metal layer and the carbon layer, and the metal layer and the carbon layer may be corroded by long-term use. Conversely, when it is thick, the far-infrared absorption amount of the hard coat layer increases and the far-infrared reflectance tends to decrease.

  Next, the UV cut layer is a known technique such as a gravure coating method, reverse roll coating method, roll coating method, dip coating method, or the like, in which a conventionally known organic UV absorber or inorganic UV blocking agent is mixed. It can be formed by coating. The organic ultraviolet absorber used in the present invention is not particularly limited, but various types such as benzophenone, benzotriazole, benzoate, and triazine can be used. Examples of the inorganic ultraviolet blocking agent include fine powders such as zinc oxide, titanium oxide, and magnesium oxide. Examples of the coating agent in which the organic ultraviolet absorber and the inorganic ultraviolet blocking agent are mixed include acrylic resins, urethane resins, fluorine resins, and silicon resins. As the ultraviolet blocking performance of the ultraviolet cut layer, the ultraviolet blocking rate at a wavelength of 280 to 400 nm is preferably 50% or more on average, more preferably 70% or more on average. Moreover, it is also a preferable aspect to have the capability of blocking 70% or more of ultraviolet light having a wavelength of 315 to 400 nm at each wavelength. In addition to improving durability by blocking ultraviolet rays with an ultraviolet cut layer, when used for agriculture, it is effective in avoiding pest damage and leads to reduction of agricultural chemicals.

  When the laminated film of the present invention is used in an agricultural house, the far-infrared reflectance, visible light is used in order to reduce the heating cost that occupies most of the cultivation cost and efficiently incorporate visible light necessary for plant growth. It is preferable that the transmittance performance is expressed at a high level. Specifically, the reflectance of 5.5 to 50 μm far infrared rays calculated according to JIS R3106 is 70% or more, and the transmittance of visible light of 400 to 780 nm. Is preferably 50% or more, more preferably far infrared reflectance is 80% or more, and visible light transmittance is 60% or more.

  In addition, the laminated film of the present invention preferably has an average ultraviolet blocking rate of 280 to 400 nm of 50% or more, preferably 80% or more, and more preferably 90% or more.

Hereinafter, the present invention will be described in more detail with reference to examples. The measurement and calculation methods of characteristic values shown in the examples are as follows.

A. Preparation of test specimen for evaluation A method for preparing a test specimen for use in tests of far-infrared reflectance, visible light transmittance, and scratch resistance is shown below.
(1) Cut the laminated film into 50 mm squares.
(2) A double-sided tape having a width of 7.5 mm (PROSELF No. 539R: manufactured by Nitoms Co., Ltd.) is bonded to two opposite sides of the ultraviolet cut layer surface of the film cut in the above (1).
(3) The film prepared in the item (2) is bonded to 50 mm square float glass (3 mm thickness) to obtain a test specimen for evaluation.

B. Far-infrared reflectance (1) Standard: Conforms to JIS R3106-1998 (2) Measuring method: (i) Spectrophotometer “IR Prestige-21 (manufactured by Shimadzu Corporation)”, specular reflection measuring unit “SRM-8000A” The spectral reflectance at a wavelength of 5 to 25 μm of the test specimen for evaluation is measured using “manufactured by Shimadzu Corporation”. An Al vapor deposition mirror is used for the standard plate. (ii) Extract the spectral reflectance at the selected wavelengths of λ1 (wavelength 5.5 μm) to λ30 (wavelength 50 μm) described in Appendix 3 of the JIS text from the spectral reflectance. In addition, the value of (lambda) 24 (wavelength 23.3 micrometers) is used for the reflectance of (lambda) 25 (wavelength 25.2 micrometers)-(lambda) 30 (wavelength 50 micrometers). (iii) Multiply the extracted spectral reflectance by the standard reflectance of the Al vapor deposition mirror described in Appendix 3 of the JIS text to obtain the reflectance of the evaluation specimen at the selected wavelength of λ1 to λ30. (iv) The average value of the reflectance is defined as the far-infrared reflectance.
(3) Measurement conditions: Wavelength range “5 to 25 μm”, avodis coefficient “Happ-Genzel”, integration count “10 times”, resolution “4.0 cm −1”.

C. Visible light transmittance (1) Standard: based on JIS R3106-1998 (2) Measuring method: (i) Using spectrophotometer “UV-3150 (manufactured by Shimadzu Corporation)”, wavelength of test specimen 400 to 400 The spectral transmittance at 780 nm is measured at 10 nm intervals. (ii) After multiplying the transmittance by the weight coefficient described in Appendix 1 of the JIS text, an average value was calculated to obtain the visible light transmittance (%).
(3) Measurement conditions: wavelength range “400 to 780 nm”, scan speed “high speed”,
Decomposition capacity “10 nm”.

D. Scratch resistance Using the test specimen for evaluation prepared in the above section A, evaluation was performed with the following measuring apparatus and measurement conditions.
(1) Measuring device: RT-200 (manufactured by Daiei Kagaku Seiki Seisakusho Co., Ltd.)
(2) Measurement conditions: rubbing speed “10 reciprocations / minute”, rubbing frequency “100 reciprocations”, load “500 gf / 2.5 cm 2”, friction element (steel wool) specification “Bonster # 0000 (manufactured by Nippon Steel Wool Co., Ltd.) ) "
(3) Evaluation: After completion of the test, the number of occurrences of “scratches” was visually measured. A: Less than 5/10 mm width, ○: 5 or more, less than 10/10 mm width, Δ: 10 or more / 10 mm width, x: Peeling occurred in the metal layer under the hard coat layer.

E. Ultraviolet ray blocking performance (1) Measuring method: (i) Using a spectrophotometer “UV-3150 (manufactured by Shimadzu Corporation)”, the spectral transmittance at a wavelength of 280 to 400 nm of the test specimen for evaluation is measured at intervals of 5 nm. (ii) The ultraviolet blocking rate at each wavelength is calculated based on the following formula, and the average value is defined as the ultraviolet blocking performance.
UV blocking rate (%) of laminated film = (1−transmittance of laminated film / transmittance when laminated film is not inserted) × 100
UV blocking rate (%) of UV cut layer = (1−transmittance of laminated film / transmittance of laminated film before UV cut layer lamination) × 100
(2) Measurement conditions: wavelength range “280 to 400 nm”, scan speed “high speed”,
Decomposition capacity "5nm".

F. Metal layer, carbon layer, hard coat layer thickness Using a high-speed spectroscopic ellipsometer, the change in the polarization state of the reflected light is measured, and the MSE (least square error) is minimized for the refractive index, extinction coefficient, and film thickness. Fitting analysis was performed to determine the film thickness of each layer.
(1) Measuring device: M-2000 (manufactured by JA Woollam)
(2) Measurement conditions: incident angle “65, 70, 75 degrees”, measurement wavelength “195 to 1680 nm”, beam meter “12 nm”.
[Example 1] A layer (1 µm thickness) made of an acrylic resin to which a benzophenone ultraviolet absorber was added was formed on one side of a PET film (100 µm thickness) to form an ultraviolet cut layer. Next, a silver metal layer (12 nm thickness) and a carbon layer (3 nm thickness) are sputtered in order on the opposite surface of the PET film, and a photocurable acrylic resin “OPSTAR (registered trademark) Z7535: JSR” is further formed on the carbon layer. "(Co., Ltd.)" was coated, dried, and then irradiated with UV to form a hard coating layer having a thickness of 0.8 µm to obtain a multilayer film.

  [Example 2] The same as Example 1 except that an acrylic resin "OPSTAR (registered trademark) Z7535: manufactured by JSR Corporation" was formed to a thickness of 3 µm as an undercoat layer between the PET film and the silver layer. A multilayer film was obtained by this method.

  [Example 3] A multilayer film was obtained in the same manner as in Example 2 except that the thickness of the silver layer was changed to 10 nm.

  [Example 4] A multilayer film was obtained in the same manner as in Example 2 except that the thickness of the silver layer was changed to 15 nm.

  [Example 5] A multilayer film was obtained in the same manner as in Example 2 except that the thickness of the carbon layer was changed to 1 nm.

  [Example 6] A multilayer film was obtained in the same manner as in Example 2 except that the thickness of the carbon layer was changed to 5 nm.

  [Example 7] An agricultural film was obtained in the same manner as in Example 2 except that the thickness of the hard coat layer was changed to 0.6 µm.

  [Example 8] A multilayer film was obtained in the same manner as in Example 2 except that the thickness of the hard coat layer was changed to 1.0 µm.

  Example 9 An agricultural film was obtained in the same manner as in Example 2 except that an ITO layer (50 nm) was sputtered as a dielectric layer between the metal layer and the carbon layer.

  [Comparative Example 1] An acrylic resin layer (thickness: 1 µm) mixed with an organic ultraviolet absorbent was formed on one side of a PET film (thickness: 100 µm) in the same manner as in Example 1 to obtain an ultraviolet cut layer. Next, a metal layer (12 nm thick) made of silver is sputtered on the opposite surface of the PET film. Further, an acrylic resin “OPSTAR Z7535: manufactured by JSR Corporation” is coated on the silver layer, dried, and then irradiated with UV. An agricultural film was obtained by forming a hard coat layer having a thickness of 8 μm.

  [Comparative Example 2] In addition to forming an acrylic resin “OPSTAR (registered trademark) Z7535: made by JSR Corporation” as a thickness of 3 μm between the PET film and the silver layer, the thickness of the hard coat layer was A test specimen was obtained in the same manner as in Comparative Example 1 except that the thickness was changed to 2.5 μm.

  [Comparative Example 3] In addition to forming an acrylic resin “OPSTAR (registered trademark) Z7535: manufactured by JSR Corporation” as a thickness of 0.8 μm as an undercoat layer between the PET film and the silver layer, the thickness of the silver layer A test specimen was obtained in the same manner as in Comparative Example 1 except that was changed to 25 nm.

  Tables 1 and 2 show the evaluation results of the far-infrared reflectance, visible light transmittance, and scratch resistance of each specimen.

  In the configuration of the ultraviolet cut layer (1 μm) / PET (100 μm) / metal layer (12 nm) / carbon (3 nm) / hard coat layer (0.8 μm) of Example 1, far-red reflectance 87%, visible light transmittance The scratch resistance was “◯” at 55%. The ultraviolet blocking rate of the ultraviolet blocking layer was 97%, and the ultraviolet blocking rate as a laminated film was 99%. In Example 2, acrylic resin (3 μm) was laminated as an undercoat layer between PET and the silver layer. As a result, the far-red reflectance was 85% and the visible light transmittance was 56%, and the scratch resistance was “◎”. It was confirmed that the scratch resistance was improved by the introduction of the undercoat layer.

The ultraviolet blocking rate of the ultraviolet blocking layer was 97%, and the ultraviolet blocking rate as a laminated film was 99%. In Example 3 and Example 4, the thickness of the silver layer was changed to 10 nm and 15 nm, respectively. As a result, it was confirmed that the far-red reflectance was increased and the visible light transmittance was decreased in proportion to the thickness of the silver layer. The UV blocking rate of the UV blocking layer was 97% in Example 3 and 97% in Example 4. The UV blocking rate as a laminated film was 99% in Example 3 and 99% in Example 4. It was. In Example 5 and Example 6, the thickness of the carbon layer was changed to 1 nm and 5 nm, respectively, but the scratch resistance was “◯” or more. The UV blocking rate of the UV blocking layer was 97% in Example 5 and 96% in Example 6. The UV blocking rate as a laminated film was 99% in Example 5 and 98% in Example 6. It was. In Example 7 and Example 8, the acrylic resin film thickness of the hard coat layer was changed to 0.6 μm and 1.0 μm, respectively. As a result, the far-red reflectance was 89% and 80%, the visible light transmittance was 54% and 55%, and the scratch resistance was “◯” or more. The UV blocking rate of the UV cut layer was 96% in Example 7 and 96% in Example 8. The UV blocking rate as a laminated film was 98% in Example 7 and 98% in Example 8. It was. In Example 9, it was confirmed that the visible light transmittance was improved to 65% by laminating ITO (tin-doped indium oxide) 50 nm between the hard coat layer and the silver layer as the dielectric layer. The ultraviolet blocking rate of the ultraviolet blocking layer was 96%, and the ultraviolet blocking rate as a laminated film was 99%.
On the other hand, Comparative Example 1 has the same configuration as Example 1 except that there was no carbon layer, but the scuff resistance evaluation was “x”. The ultraviolet blocking rate of the ultraviolet blocking layer was 95%, and the ultraviolet blocking rate as a laminated film was 98%.

  In addition, it is set as the structure as shown in Table 2 as the comparative example 2, and it shows in Table 2 about the physical property. In contrast to the above-mentioned Examples and Comparative Examples, the present invention improves the scratch resistance performance due to the presence of the carbon layer between the metal layer and the hard coat layer, and is a multilayer excellent in far-infrared reflection performance and ultraviolet cut performance. A film is obtained.

  Since the multilayer film of the present invention is excellent in far-infrared reflection performance, ultraviolet cut performance and scratch resistance, it is suitable for agricultural films such as greenhouses.

Claims (8)

A laminated film, wherein a metal layer / carbon layer / hard coat layer is formed in order on one side of a base material made of synthetic resin, and an ultraviolet cut layer is formed on the other side surface of the base material. The laminated film according to claim 1, wherein the hard coat layer is made of a cured resin.   The laminated film according to claim 1 or 2, wherein the hard coat layer has a thickness of 0.5 to 1 µm. The laminated film according to any one of claims 1 to 3, wherein the ultraviolet cut layer has an average blocking performance of 50% or more against ultraviolet electromagnetic waves having a wavelength of 280 to 400 nm. The laminated film according to any one of claims 1 to 4, wherein the metal layer has a multilayer structure including a far-infrared reflective layer mainly composed of silver and a dielectric layer.   The laminated film according to claim 1, wherein an undercoat layer is formed between the base material and the metal layer. The thickness of the metal layer is 5 to 20 nm, the thickness of the carbon layer is 1 to 20 nm, and the ultraviolet ray cut layer blocks 70% or more of ultraviolet rays having wavelengths of 315 to 400 nm at each wavelength. Laminated film.   The laminated film according to any one of claims 1 to 7, which is used for agriculture.