WO2024058100A1 - 積層フィルム、織編物、及び施設園芸用フィルム - Google Patents

積層フィルム、織編物、及び施設園芸用フィルム Download PDF

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Publication number
WO2024058100A1
WO2024058100A1 PCT/JP2023/032991 JP2023032991W WO2024058100A1 WO 2024058100 A1 WO2024058100 A1 WO 2024058100A1 JP 2023032991 W JP2023032991 W JP 2023032991W WO 2024058100 A1 WO2024058100 A1 WO 2024058100A1
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Prior art keywords
laminated film
less
wavelength
layer
film
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
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PCT/JP2023/032991
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English (en)
French (fr)
Japanese (ja)
Inventor
智子 左合
久雄 奥村
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Toyobo Co Ltd
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Toyobo Co Ltd
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Publication date
Application filed by Toyobo Co Ltd filed Critical Toyobo Co Ltd
Priority to US19/112,151 priority Critical patent/US20260021650A1/en
Priority to EP23865453.7A priority patent/EP4588653A1/en
Priority to KR1020257007275A priority patent/KR20250068617A/ko
Priority to JP2024546939A priority patent/JPWO2024058100A1/ja
Priority to CN202380065819.3A priority patent/CN119866266A/zh
Publication of WO2024058100A1 publication Critical patent/WO2024058100A1/ja
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/14—Greenhouses
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G9/00—Cultivation in receptacles, forcing-frames or greenhouses; Edging for beds, lawn or the like
    • A01G9/22—Shades or blinds for greenhouses, or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/306—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl acetate or vinyl alcohol (co)polymers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
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    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
    • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
    • B32B5/024—Woven fabric
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    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/022—Mechanical properties
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D1/00—Woven fabrics designed to make specified articles
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/283—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads synthetic polymer-based, e.g. polyamide or polyester fibres
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/20—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the material of the fibres or filaments constituting the yarns or threads
    • D03D15/292—Conjugate, i.e. bi- or multicomponent, fibres or filaments
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/40—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads
    • D03D15/44—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the structure of the yarns or threads with specific cross-section or surface shape
    • D03D15/46—Flat yarns, e.g. tapes or films
    • D—TEXTILES; PAPER
    • D03—WEAVING
    • D03D—WOVEN FABRICS; METHODS OF WEAVING; LOOMS
    • D03D15/00—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used
    • D03D15/50—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads
    • D03D15/54—Woven fabrics characterised by the material, structure or properties of the fibres, filaments, yarns, threads or other warp or weft elements used characterised by the properties of the yarns or threads coloured
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B1/00—Weft knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B1/14—Other fabrics or articles characterised primarily by the use of particular thread materials
    • D04B1/16—Other fabrics or articles characterised primarily by the use of particular thread materials synthetic threads
    • D—TEXTILES; PAPER
    • D04—BRAIDING; LACE-MAKING; KNITTING; TRIMMINGS; NON-WOVEN FABRICS
    • D04B—KNITTING
    • D04B21/00—Warp knitting processes for the production of fabrics or articles not dependent on the use of particular machines; Fabrics or articles defined by such processes
    • D04B21/14—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes
    • D04B21/16—Fabrics characterised by the incorporation by knitting, in one or more thread, fleece, or fabric layers, of reinforcing, binding, or decorative threads; Fabrics incorporating small auxiliary elements, e.g. for decorative purposes incorporating synthetic threads
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/22—Absorbing filters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/28—Interference filters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/418—Refractive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/737—Dimensions, e.g. volume or area
    • B32B2307/7375—Linear, e.g. length, distance or width
    • B32B2307/7376—Thickness
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2331/00—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products
    • D10B2331/04—Fibres made from polymers obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. polycondensation products polyesters, e.g. polyethylene terephthalate [PET]
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2401/00—Physical properties
    • D10B2401/14—Dyeability
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/18—Outdoor fabrics, e.g. tents, tarpaulins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
    • Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
    • Y02A40/25—Greenhouse technology, e.g. cooling systems therefor

Definitions

  • the present invention provides a laminated film that does not obstruct the growth of plants, has excellent heat shielding properties, and has excellent handling properties such as film fit and foldability. , woven and knitted fabrics, and films for greenhouse horticulture.
  • the present invention relates to a laminated film, a woven or knitted fabric, a film for greenhouse horticulture, etc. that does not obstruct the growth of plants and has excellent heat shielding properties.
  • films having far-infrared reflection performance and visible region transmission performance have been proposed as films for agricultural greenhouses (see, for example, Patent Documents 1 and 2).
  • it is provided with reflective performance by a metal-containing layer, and its visible region transmittance is low.
  • it has been proposed to provide a UV-cutting layer, it does not have sufficient performance.
  • NIR near-infrared
  • the present invention provides a laminated film, woven or knitted fabric, which does not obstruct the growth of plants, has excellent heat shielding properties, and has excellent handling properties such as film fit and foldability. , and films for greenhouse horticulture.
  • the present invention aims to provide a laminated film, a woven or knitted fabric, a film for greenhouse horticulture, etc. that has excellent heat shielding properties without blocking the growth of plants. purpose.
  • the present inventors have discovered that the above problems can be solved by using a predetermined laminated film, and have completed the present invention.
  • the present invention provides the following laminated film.
  • a laminated film for agricultural greenhouses that utilizes sunlight includes a multilayer laminated film in which at least two types of resin layers having different refractive indexes are alternately laminated in the thickness direction, and has the following optical properties: At an incident angle of 0°, an average transmittance of 70 at a wavelength of 430 nm or more and 680 nm or less % or more, and has an average reflectance of less than 80% at a wavelength of 800 nm or more and 1100 nm or less, The multilayer laminate film has a stiffness of less than 50.0 mN/cm.
  • the laminated film has the following optical properties: At an incident angle of 30°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average reflectance at a wavelength of 700 nm or more and 900 nm or less.
  • the laminated film has the following optical properties: At an incident angle of 0°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average reflectance at a wavelength of 700 nm or more and 900 nm or less.
  • the laminated film according to any one of [1] to [3], which has 70% or more.
  • the present invention provides the following woven or knitted fabric.
  • a woven or knitted fabric comprising a narrow tape cut from the laminated film according to any one of [1] to [6].
  • [8] [1] A woven or knitted fabric woven and knitted using a narrow strip tape cut from the laminated film according to any one of [1] to [6] as the warp or weft and using filament yarn or spun yarn as the warp or weft.
  • the present invention provides the following film for greenhouse horticulture.
  • a film for greenhouse horticulture comprising the laminated film according to any one of [1] to [6].
  • the present invention provides the following laminated film.
  • a laminated film for agricultural greenhouses that utilizes sunlight includes a multilayer laminated film in which at least two types of resin layers having different refractive indexes are alternately laminated in the thickness direction, and has the following optical properties: At an incident angle of 0°, an average transmittance of 80 at a wavelength of 430 nm or more and 680 nm or less % or more, and an average reflectance of less than 70% at a wavelength of 800 nm or more and 1100 nm or less.
  • the laminated film has the following optical properties: At an incident angle of 30°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average reflectance at a wavelength of 700 nm or more and 900 nm or less.
  • the laminated film according to [1] which has 70% or more.
  • the laminated film has the following optical properties: At an incident angle of 0°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average reflectance at a wavelength of 700 nm or more and 900 nm or less.
  • the present invention provides the following woven or knitted fabric.
  • [6] [1] A woven or knitted fabric comprising a narrow strip tape cut from the laminated film according to any one of [1] to [5].
  • [7] [1] A woven or knitted fabric woven using a narrow strip tape cut from the laminated film according to any one of items 1 to 5 as the warp or weft, and using filament yarn or spun yarn as the warp or weft.
  • the present invention provides the following film for greenhouse horticulture.
  • a film for greenhouse horticulture comprising the laminated film according to any one of [1] to [5].
  • the laminated film of the present invention can be a laminated film with excellent heat shielding properties without blocking the growth of plants.
  • the woven and knitted fabrics and films for greenhouse horticulture of the present invention use the above-mentioned laminated films, for example, in agricultural greenhouses using them, they can easily suppress the temperature rise in the greenhouse, etc., and can be used for a long period of time. It becomes possible to suitably promote plant growth over a period of time.
  • the laminated film of the present invention can be a laminated film that does not block the growth of plants, has excellent heat shielding properties, and has excellent handling properties such as film fit and foldability.
  • the woven and knitted fabrics and films for greenhouse horticulture of the present invention use the above-mentioned laminated films, for example, in agricultural greenhouses using them, they can easily suppress the temperature rise in the greenhouse, etc., and can be used for a long period of time.
  • the film can have excellent handling properties such as fit and foldability.
  • the laminated film of the present invention can be a laminated film with excellent heat shielding properties without blocking the growth of plants.
  • the woven and knitted fabrics and films for greenhouse horticulture of the present invention use the above-mentioned laminated films, for example, in agricultural greenhouses using them, they can easily suppress the temperature rise in the greenhouse, etc., and can be used for a long period of time. It becomes possible to suitably promote plant growth over a period of time.
  • FIG. 1 is a partial front view showing an embodiment of a laminated film of the present invention.
  • FIG. 6 is a partial front view showing another embodiment of the laminated film of the present invention.
  • FIG. 3 is a schematic diagram showing a mode of measuring loop stiffness in an example of the present invention.
  • a numerical range expressed using " ⁇ ” means a range that includes the numerical values written before and after " ⁇ " as the lower limit and upper limit.
  • the laminated film of the present invention is A laminated film for agricultural greenhouses that utilizes sunlight
  • the laminated film includes a multilayer laminated film in which at least two types of resin layers having different refractive indexes are alternately laminated in the thickness direction, and has the following optical properties: At an incident angle of 0°, an average transmittance of 70 at a wavelength of 430 nm or more and 680 nm or less % or more, and has an average reflectance of less than 80% at a wavelength of 800 nm or more and 1100 nm or less, The stiffness of the multilayer laminated film is less than 50.0 mN/cm.
  • the laminated film of the present invention is A laminated film for agricultural greenhouses that utilizes sunlight
  • the laminated film includes a multilayer laminated film in which at least two types of resin layers having different refractive indexes are alternately laminated in the thickness direction, and has the following optical properties: At an incident angle of 0°, an average transmittance of 80 at a wavelength of 430 nm or more and 680 nm or less % or more, and an average reflectance of less than 70% at a wavelength of 800 nm or more and 1100 nm or less.
  • visible light refers to light with a wavelength of 400 nm or more and 800 nm or less
  • heat rays refers to light with a wavelength of 800 nm or more and 1400 nm or less.
  • the laminated film includes a multilayer laminated film in which at least two types of resin layers having different refractive indexes are alternately laminated in the thickness direction.
  • the above-mentioned multilayer laminated film may include, for example, a first resin layer (hereinafter also referred to as “first layer”) and a second resin layer (hereinafter referred to as “second layer”) having different refractive indexes as the outermost layer. It is a layer in which 20 or more layers (hereinafter also referred to as “multilayer laminated structure”) are alternately laminated in the thickness direction.
  • the multilayer laminate film of the present invention preferably has a laminate structure portion in which the above-described first layer and second layer are alternately laminated for a total of 51 or more layers.
  • the upper limit of the number of layers may be, for example, 1001 layers, but from the viewpoint of productivity, it is preferably at most 900 layers.
  • the lower limit of the number of layers is more preferably 100 layers or more, still more preferably 150 layers or more. If the number of layers is less than the lower limit, selective reflection due to multiple interference may be small and sufficient near-infrared reflection performance may not be obtained.
  • resins known per se can be employed, such as polyester, polysulfone, polyamide, polyether, polyketone, polyacrylic, polycarbonate, polyacetal, polystyrene, polyamideimide, polyarylate, Examples include polyolefins, polyfluoropolymers, polyurethanes, polyarylsulfones, polyethersulfones, polyarylene sulfur, polyvinyl chloride, polyetherimides, tetrafluoroethylene, polyetherketones, etc. These are not limited to homopolymers, but can be copolymerized. There may be. These may be used alone or in combination of two or more.
  • At least one of the resin layers has a fused aromatic ring as a repeating unit, such as a naphthalene ring, which can easily increase the refractive index. It's okay.
  • thermoplastic resins with crystallinity are preferred as the resin used for the resin layer with a high refractive index (for example, as the first layer) because they tend to exhibit a high degree of molecular orientation by stretching.
  • Thermoplastic resins having a temperature of 200°C or higher are preferred. From such a viewpoint, as a specific thermoplastic resin, polyester is preferable, and polyethylene naphthalate and polyethylene terephthalate are more preferable.
  • polyethylene naphthalate those known per se can be used as appropriate.
  • polyethylene naphthalate for example, polyethylene-2,6-naphthalene dicarboxylate is preferable, and polyethylene-2,6-naphthalate having a condensed aromatic ring is particularly preferable because it has a high refractive index and can be stretched at a high stretching ratio.
  • Dicarboxylates are preferred.
  • the proportion of the ethylene naphthalene dicarboxylate component which is a monomer component in the polyethylene naphthalate, is preferably 95 mol% or more and 100 mol% or less based on all repeating units constituting the polyethylene naphthalate, and more preferably Preferably it is 96 mol% or more, more preferably 97 mol% or more. If the proportion of the ethylene naphthalene dicarboxylate component, which is the main component, is less than the lower limit, the melting point and/or glass transition point of the polyethylene naphthalate constituting the first layer will decrease, and the polyethylene constituting the second layer described below will decrease. It is difficult to obtain a temperature difference between the melting point and/or the glass transition point with terephthalate, and as a result, it may be difficult to provide a sufficient refractive index difference to the biaxially stretched laminated polyester film.
  • Copolymerization components other than the main components constituting the polyethylene naphthalate include, for example, isophthalic acid, terephthalic acid, orthophthalic acid, naphthalene dicarboxylic acids other than the main naphthalene dicarboxylic acid, aromatic carboxylic acids such as biphenyldicarboxylic acid; succinic acid, Aliphatic dicarboxylic acids such as adipic acid, azelaic acid, sebacic acid, and decanedicarboxylic acid; acid components such as alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid, diethylene glycol, propylene glycol, 1,4-butanediol, 1,5 -Aliphatic diols such as pentanediol, 1,6-hexanediol, neopentyl glycol; alicyclic diols such as 1,4-cyclohexanedimethanol
  • copolymerizable components at least one selected from the group consisting of isophthalic acid, terephthalic acid, neopentyl glycol, 1,4-cyclohexanedimethanol, and diethylene glycol is preferred.
  • isophthalic acid and terephthalic acid are particularly preferred.
  • These copolymerization components may be used alone or in combination of two or more.
  • the above polyethylene naphthalate can be produced by appropriately applying a known method.
  • it can be produced by esterifying the main diol component, dicarboxylic acid component, and, if necessary, a copolymer component, and then subjecting the resulting reaction product to a polycondensation reaction to produce a polyester.
  • the polyester may be produced by subjecting derivatives of these raw material monomers to a transesterification reaction, and then subjecting the resulting reaction product to a polycondensation reaction to obtain a polyester.
  • it may be obtained by melt-kneading two or more types of polyesters in an extruder and causing a transesterification reaction (redistribution reaction).
  • the intrinsic viscosity of the polyethylene naphthalate constituting the first layer is preferably from 0.40 dl/g to 0.80 dl/g, for example from 0.45 dl/g to 0.75 dl/g. You can. If the intrinsic viscosity of the polyethylene naphthalate constituting the first layer is not within this range, the difference between the intrinsic viscosity of the polyethylene terephthalate constituting the second layer may become large, and as a result, an alternate lamination structure is adopted. In some cases, the layer structure may be disturbed, or although a film can be formed, the film formability may deteriorate. When two or more polyesters are melt-mixed in an extruder and subjected to transesterification, the intrinsic viscosity of each polyester may be within the above range.
  • the glass transition temperature of the polyethylene naphthalate constituting the first layer is preferably higher than the glass transition temperature of the polyethylene terephthalate constituting the second layer.
  • the resin used for the resin layer with a low refractive index should be able to express a sufficient difference in refractive index from the resin layer with a high refractive index and maintain the necessary adhesion.
  • a resin in which a copolymer component capable of lowering the refractive index is copolymerized with the resin used for the resin layer having a high refractive index can also be used.
  • an amorphous resin or a resin having a sufficiently lower melting point than the resin of the resin layer having a high refractive index since there is no need to increase the refractive index by stretching or the like, it is also possible to use an amorphous resin or a resin having a sufficiently lower melting point than the resin of the resin layer having a high refractive index.
  • amorphous polyester containing an ethylene terephthalate component can be suitably used.
  • polylactic acid, acrylic resin, polycarbonate, and polystyrene can also be used as the resin for the resin layer with a low refractive index.
  • the polyethylene terephthalate mentioned above it is possible to increase the initial transparency and reflectance of the film by selecting the processing conditions during film formation, but it crystallizes due to heating during post-processing and reduces the transparency and reflectance characteristics. May be accompanied by a decrease.
  • amorphous polyester as the polyethylene terephthalate in the second layer, the high transparency and reflectance at the initial stage of the film can be maintained even after heating during post-processing.
  • ethylene terephthalate examples include polyesters containing an ethylene terephthalate component of 50 mol% or more and 80 mol% or less based on all repeating units of the polyethylene terephthalate constituting the second layer, and more preferably 55 mol% or more of an ethylene terephthalate component.
  • Copolymerized polyethylene terephthalate having a copolymerization content of mol % or more and 75 mol % or less that is, the copolymerized component is preferably 20 mol % or more and 50 mol % or less, more preferably 25 mol % or more and 45 mol % or less) can be mentioned. can.
  • the copolymerization amount may be adjusted depending on the type of copolymerization component used. For example, if the copolymerization component of copolymerized PET is isophthalic acid or naphthalene dicarboxylic acid, it is approximately 30 mol%. That's all.
  • the amount of copolymerization is less than the lower limit, crystallization and orientation will occur easily during film formation, making it difficult to create a difference in refractive index with the first layer, and the near-infrared reflective ability will tend to decrease. Further, haze increases due to crystallization during film formation.
  • the amount of copolymerization exceeds the upper limit, heat resistance and film formability during film formation (especially during extrusion) tend to decrease, and if the copolymerization component is a component that imparts high refractive index properties, The difference in refractive index with the first layer tends to become smaller due to an increase in refractive index.
  • Copolymerization components preferably used in the polyethylene terephthalate constituting the second layer include aromatic dicarboxylic acids such as isophthalic acid, 2,6-naphthalene dicarboxylic acid, and 2,7-naphthalene dicarboxylic acid, adipic acid, and azelaic acid.
  • aromatic dicarboxylic acids such as isophthalic acid, 2,6-naphthalene dicarboxylic acid, and 2,7-naphthalene dicarboxylic acid, adipic acid, and azelaic acid.
  • aliphatic dicarboxylic acids such as sebacic acid and decanedicarboxylic acid
  • alicyclic dicarboxylic acids such as cyclohexanedicarboxylic acid
  • aliphatic diols such as butanediol and hexanediol
  • alicyclic diols such as cyclohexanedimethanol
  • spiroglycol Glycol components such as Among these, isophthalic acid, 2,6-naphthalene dicarboxylic acid, cyclohexanedimethanol, and spiroglycol are preferred, and when copolymerization components other than these are included, the amount of copolymerization is preferably 10 mol % or less.
  • the copolymerization component of the polyethylene terephthalate is preferably 1,4-cyclohexanedimethanol from the viewpoint of having a low refractive index and a small decrease in molecular weight during extrusion
  • the intrinsic viscosity of the polyethylene terephthalate is preferably 0.4 dl/g or more and 1.0 dl/g or less, for example, 0.45 dl/g or more and 0.95 dl/g or 0.5 dl/g or more and 0.95 dl /g or less. If the intrinsic viscosity of the polyethylene terephthalate constituting the second layer is not within this range, the difference between the intrinsic viscosity of the polyethylene naphthalate constituting the first layer may become large, and as a result, the alternating layer structure In this case, the layer structure may be disturbed, and although a film can be formed, the film formability may deteriorate.
  • the above polyethylene terephthalate can be produced by appropriately applying a known method.
  • it can be produced by esterifying the main acid component, glycol component, and copolymerization component, and then subjecting the resulting reaction product to polycondensation reaction to obtain a polyester.
  • the polyester may be produced by subjecting derivatives of these raw material monomers to a transesterification reaction, and then subjecting the resulting reaction product to a polycondensation reaction to obtain a polyester.
  • it may be obtained by melt-kneading two or more types of polyesters in an extruder and causing a transesterification reaction (redistribution reaction).
  • first layer and the second layer may contain a small amount of additives as long as the object of the present invention is not impaired, such as lubricants such as inert particles, colorants such as pigments and dyes, Examples include additives such as stabilizers, flame retardants, and blowing agents.
  • lubricants such as inert particles
  • colorants such as pigments and dyes
  • additives such as stabilizers, flame retardants, and blowing agents.
  • each of the first layer and the second layer is preferably such that an effect of selectively reflecting near-infrared light is obtained due to optical interference between the layers.
  • the reflection wavelength of the multilayer laminated film corresponds to twice the total optical thickness of the adjacent first layer and second layer.
  • the optical thickness is expressed as the product of the refractive index and the thickness of each layer, and it is preferable to adjust the thickness of each layer depending on the refractive index of the resin used and the desired reflection wavelength.
  • the optical thickness and its ratio are determined by the following formula.
  • Optical thickness ratio (n1 x d1)/(n2 x d2) n1 Refractive index of the first layer n2 Refractive index of the second layer d1 Thickness of the first layer d2 Thickness of the second layer
  • the thickness of the second layer is set to 1.0 with respect to the thickness of the adjacent first layer, taking into consideration the refractive index of the layers of the multilayer laminated film. It is preferable to make the adjustment so that the peaks are close to each other, in particular, because it is possible to prevent the appearance of secondary reflection peaks in the visible light region from affecting the decline in photosynthesis.
  • the optical thickness ratio of the multilayer laminate film is 0.60 or more and less than 1.0.
  • the lower limit of the optical thickness ratio of the multilayer laminated film depends on the purpose and application, for example, 0.65 or more, 0.70 or more, 0.75 or more, 0.77 or more, 0.79 or more, Or it may be 0.8 or more, and the upper limit may be 099 or less, 0.98 or less, 097 or less, 0.95 or less, 0.93 or less, 0.91 or less, or 0.90 or less. good.
  • the first layer is polyethylene-2,6-naphthalate (hereinafter referred to as "PEN")
  • the second layer is a copolymerized copolymer of 30 mol% cyclohexanedimethanol.
  • CHDM30PET polymerized polyethylene terephthalate
  • each layer of the second layer is preferably in the range of 0.09 ⁇ m or more and 0.18 ⁇ m or less, and the thickness of each layer of the second layer is preferably in the range of 0.09 ⁇ m or more and 0.23 ⁇ m or less, particularly 0.10 ⁇ m or more and 0.20 ⁇ m or less. Preferably, the range is within the range.
  • the laminated film may include, for example, a protective layer on at least one outermost layer of the multilayer laminated structure.
  • the protective layer preferably contains the resin used for the first layer.
  • the protective layer is preferably a layer mainly composed of polyethylene naphthalate.
  • polyethylene naphthalate etc.
  • the description in the column for the first layer can be used in the same manner as appropriate.
  • the protective layer contains polyethylene naphthalate in an amount of 50% by mass or more, for example, it may be 80% by mass or more. , 90% by mass or more.
  • the thickness of the protective layer is 10 ⁇ m or less, but may be, for example, 1 ⁇ m or more and 9 ⁇ m or less, 2 ⁇ m or more and 8 ⁇ m or less, 3 ⁇ m or more and 7 ⁇ m or less, or 4 ⁇ m or more and 5 ⁇ m or less.
  • the thickness of the protective layer refers to the thickness of each of them.
  • the surface functional layer of the present invention is, for example, a layer provided on at least one surface of the laminated film, and is made of a resin composition containing particles and resin.
  • the above particles may be inorganic particles, organic particles, or organic-inorganic composite particles. Specifically, particles of silica, acrylic resin, styrene resin, acrylic/styrene copolymer resin, silicone, melamine resin, benzoguanamine resin, and the like can be used. These may be used alone or in combination of two or more.
  • the above-mentioned particles are preferably organic particles, specifically organic particles among the above-mentioned examples, and acrylic resins, styrene-based resins, and acrylic/styrene-based copolymer resins are more preferable, and are heat resistant or resistant. Acrylic resin particles are particularly preferred from the viewpoint of solvent properties.
  • the above particles have an average particle diameter of 4 ⁇ m or more and 10 ⁇ m or less, for example, 4.5 ⁇ m or more and 9.5 ⁇ m or less, 5 ⁇ m or more and 9 ⁇ m or less, 5.5 ⁇ m or more and 8.5 ⁇ m or less, 6 ⁇ m or more and 8 ⁇ m or less, and 6.5 ⁇ m or more. It may be 7.5 ⁇ m or less, or 6.7 ⁇ m or more and 7 ⁇ m or less.
  • the average particle diameter of the above particles is measured by the following method.
  • a cross-section of the surface functional layer is cut out parallel to the vertical direction using a microtome method, and an extremely thin layer of metal is sputtered onto the particle surface to provide conductivity.
  • the content of particles in the surface functional layer is 0.3 parts by mass or more and 1.5 parts by mass or less, for example, 0.4 parts by mass or more and 1.4 parts by mass, based on 100 parts by mass of the resin contained in the surface functional layer.
  • the particles preferably spherical particles are used.
  • the particles are preferably colorless and transparent particles.
  • colorless and transparent means that there is no coloring that would substantially reduce the color purity of the three primary colors and that the material has excellent light transmittance.
  • the ratio of the thickness of the surface functional layer to the average particle diameter of the particles contained in the surface functional layer is 0.5 or more.
  • the upper limit value of the above thickness ratio is not particularly limited, but from the viewpoint of suppressing material costs, it is preferably 3 or less, more preferably 2.5 or less, and 2 or less. It is even more preferable that there be.
  • the thickness of the surface functional layer refers to the area where no particles are present. This is what was measured.
  • the above resin composition contains a resin that is a binder component.
  • a resin that is a binder component include acrylic resin, polyester resin, polyolefin resin, urethane resin, and fluororesin. These may be used alone or in combination of two or more.
  • the resin is a main component (that is, contains 50% by mass or more) in the resin composition, and preferably contains 70% by mass or more, 90% by mass or more, or 95% by mass of the entire resin composition. It may contain more than that.
  • the above resin can contain a known ultraviolet absorber as appropriate, but preferably contains an ultraviolet absorber having a triazine skeleton.
  • the surface functional layer contains the ultraviolet absorber, it may be referred to as an ultraviolet absorbing layer.
  • any known ultraviolet absorber having a triazine skeleton in the molecule can be used as appropriate.
  • Examples of the ultraviolet absorber having a triazine skeleton include 2-(2-hydroxy-4-hexyloxyphenyl)-4,6-diphenyl-s-triazine, 2-(2-hydroxy-4-propoxy-5-methyl phenyl)-4,6-bis(2,4-dimethylphenyl)-s-triazine, 2-(2-hydroxy-4-hexyloxyphenyl)-4,6-diviphenyl-s-triazine, 2,4- Diphenyl-6-(2-hydroxy-4-methoxyphenyl)-s-triazine, 2,4-diphenyl-6-(2-hydroxy-4-ethoxyphenyl)-s-triazine, 2,4-diphenyl-6- (2-hydroxy-4-propoxyphenyl)-s-triazine, 2,4-diphenyl-6-(2-hydroxy-4-butoxyphenyl)-s-triazine, 2,4-bis(2-hydroxy-4- octoxyphenyl)-6-
  • the content of the ultraviolet absorber in the weather-resistant resin layer is preferably 8 parts by mass or more and 45 parts by mass or less, for example, 10 parts by mass or more and 40 parts by mass, based on 100 parts by mass of the resin contained in the surface functional layer.
  • the amount may be less than or equal to 12 parts by mass, 12 parts by mass or more and 35 parts by mass or less, 13 parts by mass or more and 30 parts by mass or less, 14 parts by mass or more and 25 parts by mass or less, or 15 parts by mass or more and 20 parts by mass or less.
  • the thickness of the surface functional layer is adjusted depending on the application, and is, for example, in the range of 1 ⁇ m or more and 125 ⁇ m or less, for example, 2 ⁇ m or more and 100 ⁇ m or less, 3 ⁇ m or more and 90 ⁇ m or less, 5 ⁇ m or more and 80 ⁇ m or less, or 10 ⁇ m.
  • the thickness may be greater than or equal to 60 ⁇ m.
  • the above-mentioned surface functional layer may contain a small amount of additives within a range that does not impair the purpose of the present invention, such as lubricants such as inert particles other than the above-mentioned particles, leveling agents for improving the quality of film formation, pigments, etc.
  • lubricants such as inert particles other than the above-mentioned particles
  • leveling agents for improving the quality of film formation pigments, etc.
  • colorants such as dyes, stabilizers, flame retardants, foaming agents, and other additives.
  • Heat ray reflective layer The above-mentioned multilayer laminated film itself has a heat ray reflection function, but may further be provided with a separately known heat ray reflection layer if necessary.
  • the laminated film of the present invention includes the multilayer laminated film described above, and has the following optical properties: At an incident angle of 0°, an average transmittance of 70% or more at a wavelength of 430 nm or more and 680 nm or less, and an average reflectance of 80% at a wavelength of 800 nm or more and 1100 nm or less. have less than The stiffness of the multilayer laminated film is less than 50.0 mN/cm.
  • spectral transmittance refers to a value measured with a spectrophotometer, and the spectral transmittance at wavelengths of 300 nm or more and 1800 nm or less was measured at 2 nm intervals, and the spectral transmittance of each wavelength was measured. Then, the average transmittance in each wavelength range was calculated. Note that the measurement is performed in the atmosphere at 25° C., and the incident angle of the measurement light is set to 0° or 30°.
  • the laminated film of the present invention has an average transmittance of 70% in the wavelength range of 430 nm or more and 680 nm at an incident angle of 0° from the viewpoint of obtaining high total light transmittance in a wavelength range useful for plant growth while having a heat ray reflecting function. It is designed to have optical properties as described above and an average reflectance of less than 80% at wavelengths of 800 nm or more and 1100 nm or less.
  • the average transmittance at a wavelength of 430 nm or more and 680 nm or less at an incident angle of 0° is, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76% or more, depending on the purpose and application. , 77% or more, 78% or more, 79% or more, 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, or 87% or more. .
  • the average reflectance at a wavelength of 800 nm or more and 1100 nm or less at an incident angle of 0° is, for example, 79% or less, 78% or less, 77% or less, 76% or less, 75% or less, 74% or less, depending on the purpose and application. , 73% or less, 72% or less, 71% or less, 70% or less, 69% or less, 68% or less, 67% or less, 66% or less, 65% or less, 60% or less, 55% or less, or 50% or less There may be.
  • the laminated film preferably has, for example, the following optical properties: an average reflectance of 70% or more at a wavelength of 700 nm or more and 900 nm or less at an incident angle of 30°.
  • the average transmittance at a wavelength of 700 nm or more and 900 nm or less at an incident angle of 30° is, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76% or more, depending on the purpose and application. , 77% or more, 78% or more, 79% or more, 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, or 87% or more. .
  • the above laminated film has the following optical properties: At an incident angle of 30°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average transmittance at a wavelength of 700 nm or more and 900 nm or less. It is preferable to have a reflectance of 70% or more.
  • the average transmittance at a wavelength of 450 ⁇ 20 nm at an incident angle of 30° is, depending on the purpose and application, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, It may be 87% or more, 88% or more, or 89% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average transmittance at a wavelength of 660 ⁇ 20 nm at an incident angle of 30° is, depending on the purpose and application, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76% or more, It may be 77% or more, 78% or more, 79% or more, 80% or more, or 81% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average reflectance at a wavelength of 700 nm or more and 900 nm or less at an incident angle of 30° is, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, depending on the purpose and application. , 87% or more, 88% or more, 89% or more, 90% or more, 91% or more, 92% or more, 93% or more, 94% or more, 95% or more, 96% or more, 97% or more, or 98% or more There may be.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the above laminated film has the following optical properties: At an incident angle of 0°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average transmittance at a wavelength of 700 nm or more and 900 nm or less. It is preferable to have a reflectance of 70% or more.
  • the average transmittance at a wavelength of 450 ⁇ 20 nm at an incident angle of 0° is, depending on the purpose and application, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, It may be 87% or more, 88% or more, or 89% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average transmittance at a wavelength of 660 ⁇ 20 nm at an incident angle of 0° is, depending on the purpose and application, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76% or more, It may be 77% or more, 78% or more, 79% or more, 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, or 86% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average reflectance at a wavelength of 700 nm or more and 900 nm or less is, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76 % or more, 77% or more, 78% or more, 79% or more, 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, 87% or more, 88% or more , 89% or more, 90% or more, 91% or more, or 92% or more.
  • the above configuration is effective in providing a heat shielding effect from sunlight.
  • the optical thickness ratio of the laminated film is preferably 0.60 or more and less than 1.0.
  • the lower limit of the optical thickness ratio of the laminated film is, for example, 0.65 or more, 0.67 or more, 0.70 or more, 0.75 or more, or 0.8 or more, depending on the purpose and application.
  • the upper limit may be 099 or less, 0.98 or less, 097 or less, 0.95 or less, 0.93 or less, 0.91 or less, or 0.90 or less.
  • the larger the optical thickness value, the higher the film stiffness, and the smaller the optical thickness value, the lower the film stiffness, and the lower the loop stiffness value especially for agricultural greenhouse applications. When used, it can improve handling and make it easier to store when opening and closing.
  • the stiffness of the laminated film is less than 50.0 mN/cm.
  • the stiffness in the present invention can be measured by loop stiffness measurement as shown in the examples.
  • the above-mentioned loop stiffness refers to the repulsive force of the loop, which is measured by forming a loop using a film cut into strips of predetermined dimensions and compressing the loop by a predetermined amount in the radial direction, and represents the rigidity of the film. It serves as an indicator.
  • a test piece is a film cut into a strip of a predetermined size, the test piece is clamped and fixed between chucks so as to form a loop, and an indenter is placed on the loop part of the test piece.
  • the loop is compressed at a predetermined speed, etc., and the repulsive force against the indenter is measured at that time, and this is taken as the loop stiffness.
  • the laminated film of the present invention When the laminated film of the present invention is applied to, for example, a film for greenhouse horticulture, it is possible to sufficiently supply visible light, which serves as a driving source for photosynthesis, to plants. Furthermore, since the laminated film of the present invention has a high total light transmittance, it is considered that it can sufficiently promote the growth of plants.
  • the laminated film of the present invention when applied to a film for greenhouse horticulture, it is possible to sufficiently shield heat rays that increase the temperature inside the agricultural greenhouse. Furthermore, since the film itself, such as a heat ray absorbing film, generates less heat, it is possible to suppress the rise in temperature within the agricultural greenhouse, and it is possible to reduce the cost required for dehumidifying and cooling. In addition, the film has excellent handling properties such as fit and foldability, making it particularly suitable as a film for greenhouse horticulture used in applications with opening/closing parts, folding parts, etc. .
  • the laminated film of the present invention includes the multilayer laminated film described above, and has the following optical properties: At an incident angle of 0°, an average transmittance of 80% or more at a wavelength of 430 nm or more and 680 nm or less, and an average reflectance of 70% at a wavelength of 800 nm or more and 1100 nm or less. have less than
  • spectral transmittance refers to a value measured with a spectrophotometer, and the spectral transmittance at wavelengths of 300 to 1800 nm was measured at 2 nm intervals, and the spectral transmittance at each wavelength was measured. Then, the average transmittance in each wavelength range was calculated. Note that the measurement is performed in the atmosphere at 25° C., and the incident angle of the measurement light is set to 0° or 30°.
  • the laminated film of the present invention has an average transmittance of 80% in the wavelength range of 430 nm or more and 680 nm at an incident angle of 0° from the viewpoint of obtaining high total light transmittance in a wavelength range useful for plant growth while having a heat ray reflecting function. It is designed to have optical properties as described above and an average reflectance of less than 70% at wavelengths of 800 to 1100 nm.
  • the average transmittance at a wavelength of 430 nm or more and 680 nm or less at an incident angle of 0° is, depending on the purpose and application, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more. , or 87% or more.
  • the average reflectance at a wavelength of 800 nm or more and 1100 nm or less at an incident angle of 0° is, for example, 69% or less, 68% or less, 67% or less, 66% or less, 65% or less, 60% or less, depending on the purpose and application. , 55% or less, or 50% or less.
  • the altitude of the sun varies depending on latitude and time of year, considering the effect of heat shielding materials during the hot seasons of the vernal and autumnal equinox in hot regions south of Tokyo, it is recommended to Designing with this in mind will be more effective in terms of light transmission that contributes to photosynthesis and heat shielding effect. Therefore, by adopting the above configuration, it is possible to effectively prevent the influence on the decline in photosynthesis due to the appearance of the secondary reflection peak in the visible light region in the coherent multilayer laminated film.
  • the above laminated film has the following optical properties: at an incident angle of 30°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average reflection at a wavelength of 700 to 900 nm. It is preferable to have a ratio of 70% or more.
  • the average transmittance at a wavelength of 450 ⁇ 20 nm at an incident angle of 30° is, depending on the purpose and application, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, It may be 87% or more, 88% or more, or 89% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average transmittance at a wavelength of 660 ⁇ 20 nm at an incident angle of 30° is, depending on the purpose and application, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76% or more, It may be 77% or more, 78% or more, 79% or more, 80% or more, or 81% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average reflectance at a wavelength of 700 nm or more and 900 nm or less at an incident angle of 30° is, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, depending on the purpose and application. , 87% or more, 88% or more, 89% or more, 90% or more, 91% or more, 92% or more, 93% or more, 94% or more, 95% or more, 96% or more, 97% or more, or 98% or more There may be.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the above laminated film has the following optical properties: At an incident angle of 0°, an average transmittance of 80% or more at a wavelength of 450 ⁇ 20 nm, an average transmittance of 70% or more at a wavelength of 660 ⁇ 20 nm, and an average transmittance at a wavelength of 700 nm or more and 900 nm or less. It is preferable to have a reflectance of 70% or more.
  • the average transmittance at a wavelength of 450 ⁇ 20 nm at an incident angle of 0° is, depending on the purpose and application, for example, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, It may be 87% or more, 88% or more, or 89% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average transmittance at a wavelength of 660 ⁇ 20 nm at an incident angle of 0° is, depending on the purpose and application, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76% or more, It may be 77% or more, 78% or more, 79% or more, 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, or 86% or more.
  • the above configuration is effective because it allows the transmission of light necessary for photosynthesis of plants.
  • the average reflectance at a wavelength of 700 nm or more and 900 nm or less is, for example, 71% or more, 72% or more, 73% or more, 74% or more, 75% or more, 76 % or more, 77% or more, 78% or more, 79% or more, 80% or more, 81% or more, 82% or more, 83% or more, 84% or more, 85% or more, 86% or more, 87% or more, 88% or more , 89% or more, 90% or more, 91% or more, or 92% or more.
  • the above configuration is effective in providing a heat shielding effect from sunlight.
  • the optical thickness ratio of the laminated film is preferably 0.60 or more and less than 1.0.
  • the lower limit of the optical thickness ratio of the laminated film is, for example, 0.65 or more, 0.67 or more, 0.70 or more, 0.75 or more, or 0.8 or more, depending on the purpose and application.
  • the upper limit may be 099 or less, 0.98 or less, 097 or less, 0.95 or less, 0.93 or less, 0.91 or less, or 0.90 or less.
  • the laminated film of the present invention When the laminated film of the present invention is applied to, for example, a film for greenhouse horticulture, it is possible to sufficiently supply visible light, which serves as a driving source for photosynthesis, to plants. Furthermore, since the laminated film of the present invention has a high total light transmittance, it is considered that it can sufficiently promote the growth of plants.
  • the laminated film of the present invention when applied to a film for greenhouse horticulture, for example, it is possible to sufficiently shield the heat rays that increase the temperature inside the agricultural greenhouse. Furthermore, since the film itself, such as a heat ray absorbing film, generates less heat, it is possible to suppress the rise in temperature inside the agricultural greenhouse, and it is possible to reduce the cost required for dehumidifying and cooling.
  • the above-mentioned laminated film may be appropriately provided with other known films or layers as long as they do not impede the effects of the present invention.
  • a lubricity imparting layer, a diffusion layer, etc. can be mentioned.
  • a lubricity imparting layer having a function of imparting lubricity may be appropriately provided.
  • a lubricity imparting layer can be provided on at least one surface, preferably both surfaces, of the laminated film.
  • the above-mentioned lubricity imparting layer is formed by coating a resin layer containing a lubricant such as fine particles or wax with an average particle size of 0.05 ⁇ m or more and 0.5 ⁇ m or less on a multilayer laminate structure, or by laminating them by coextrusion. can do.
  • the slipperiness of the film tends to be insufficient depending on the amount of particles, while if it is larger than 10 ⁇ m, particles may fall off from the coating film, which is not preferable.
  • the above-mentioned fine particles include, for example, polystyrene, polymethyl methacrylate, methyl methacrylate copolymer, methyl methacrylate copolymer crosslinked product, polytetrafluoroethylene, polyvinylidene fluoride, polyacrylonitrile, benzoguanamine resin, and polystyrene particles whose outer shell is acrylic.
  • examples include organic fine particles such as core-shell type particles covered with resin, and inorganic fine particles such as silica, alumina, titanium dioxide, kaolin, talc, graphite, calcium carbonate, feldspar, molybdenum disulfide, carbon black, and barium sulfate. Among these, organic fine particles are preferred.
  • the laminated film of the present invention can be used, for example, in the field of greenhouse horticulture, particularly in coverings and curtains for outdoor facilities such as agricultural greenhouses that utilize sunlight (for example, in invention aspect 1, especially opening/closing parts, folding parts, etc.). It can be suitably used in applications such as those in which
  • the laminated film of the present invention can be used as it is in the form of a film, or can be used by appropriately processing the laminated film.
  • a specific example of using the laminated film as it is is a form in which the laminated film is used by pasting it on an object (for example, a window material such as glass).
  • an object for example, a window material such as glass.
  • processing and using the laminated film there can be mentioned the form of using it as a woven or knitted fabric shown below.
  • the laminated film of the present invention includes the multilayer laminated film described above and has the optical properties described above.
  • a method for manufacturing a multilayer laminate film will be described, taking as an example the case where the multilayer laminate film has a multilayer laminate structure in which at least two types of resin layers having different refractive indexes are alternately laminated.
  • the multilayer laminate structure of one embodiment of the present invention is obtained by alternately overlapping a polymer constituting the first layer and a polymer constituting the second layer in a molten state using a multilayer feedblock device, for example, in a total amount of It can be obtained by creating an alternately laminated structure of 99 or more layers and providing protective layers on both sides.
  • the multilayer laminated structure described above may be laminated so that the thickness of each of the first layer and the second layer has a desired gradient structure. This can be achieved, for example, by varying the spacing and length of the slits in a multilayer feedblock device. This makes it possible to reflect a wide range of light having a wavelength of 700 nm or more and 900 nm or less.
  • the multilayer unstretched film has at least the axial direction of the film-forming machine (sometimes referred to as the longitudinal direction, longitudinal direction, or MD), or the direction orthogonal thereto in the film plane (sometimes referred to as the lateral direction, width direction, or TD). It is preferable to stretch in a uniaxial direction (the uniaxial direction is a direction along the film surface). From the viewpoint of improving mechanical properties, it is more preferable to stretch biaxially in the longitudinal direction and the transverse direction.
  • the stretching temperature is preferably in the range of the glass transition temperature (Tg) of the first layer polymer to (Tg+20)°C.
  • the stretching ratio is preferably 2.0 to 6.5 times, more preferably 3.0 to 5.5 times in both the longitudinal and transverse directions. Within this range, the larger the stretching ratio is, the smaller the variation in the refractive index of the individual layers in the first and second layers in the plane direction becomes. This is preferable because it is made uniform and the difference in refractive index in the stretching direction between the first layer and the second layer becomes large.
  • Stretching methods include uniaxial stretching in the longitudinal or transverse directions only, sequential biaxial stretching in which the longitudinal and transverse directions are stretched separately, and simultaneous biaxial stretching in which the longitudinal and transverse directions are stretched at the same time. can.
  • tenter stretching For each stretching method in the longitudinal and transverse directions, known stretching methods such as heating stretching using a rod heater, roll heating stretching, and tenter stretching can be used, but from the viewpoint of reducing scratches due to contact with the rolls and stretching speed, etc. , tenter stretching is preferred.
  • the thermal stability of the resulting multilayer laminate structure was improved by further heat-setting at a temperature of (Tg) to (Tg + 30) °C and toe-in (relaxation) in the stretching direction within a range of 1 to 15%. (for example, thermal shrinkage rate) can be highly controlled.
  • the surface functional layer is provided on at least one surface of the multilayer laminate film, and may be provided directly on the multilayer laminate film, or may be provided via another layer.
  • the surface functional layer can be formed by coating methods, spin coating methods, transfer methods, etc., but is not particularly limited, and is preferably formed by coating.
  • a method for coating and forming a surface functional layer on the surface of a multilayer laminated film specifically, known coating techniques such as a bar coating method, a roll coating method, a knife edge coating method, a gravure coating method, and a curtain coating method are used. Can be used.
  • the multilayer laminated film may be subjected to surface treatment (flame treatment, corona treatment, plasma treatment, ultraviolet treatment, etc.) before coating the surface functional layer.
  • the coating liquid used in coating is one in which the above-mentioned particles and resin are dispersed, and may be an aqueous dispersion or a dispersion dispersed in an organic solvent.
  • the coating on the multilayer laminate film can be carried out at any stage, but it is preferably carried out after the manufacturing process of the multilayer laminate structure.
  • FIG. 1 is a schematic diagram showing an example of an agricultural house provided with the laminated film of the present invention.
  • the laminated film 3 of the present invention is stretched over the upper part, and the CO2 supply means 2 , which is an arbitrary means, for supplying carbon dioxide into the inside of the agricultural house 1 is installed at the lower part.
  • a dehumidifying cooling means 4 for cooling the inside of the agricultural house 1 is provided.
  • the skylight 5 is closed during the day to maintain the carbon dioxide concentration within the agricultural house at an economically high concentration, and the skylight 5 is opened at night to lower the temperature inside the agricultural house. be able to.
  • the woven or knitted fabric of the present invention includes a narrow tape cut from the laminated film.
  • the woven or knitted fabric of the present invention has the above-mentioned structure, so it does not obstruct the growth of plants, has excellent heat shielding properties, and has particularly excellent handling properties such as film fit and foldability. Become. Therefore, it is particularly suitable as a woven or knitted fabric used for applications having opening/closing parts, folding parts, etc., among other things.
  • the above-mentioned woven or knitted fabric may include a thin strip-shaped tape cut from a laminated film, and may be composed only of the above-mentioned narrow strip-shaped tape, or may be provided with other known tapes or layers.
  • the woven or knitted fabric is, for example, a flat-knitted or warp-knitted fabric using the narrow strip tape. Further, as another example, the woven or knitted fabric is a warp-knitted fabric using the narrow band-like tape as an insertion yarn.
  • the woven or knitted fabric may be a woven or knitted fabric in which, for example, the narrow strip tape cut from the laminated film is used as the warp or weft, and filament yarn or the like is used as the weft or warp.
  • the above-mentioned woven or knitted fabric should have better mechanical strength such as windability, blocking resistance, tear resistance, and durability of the laminated film, compared to, for example, when a film with only a heat ray reflective layer is used alone. Can be done.
  • the above-mentioned woven or knitted fabric can ensure air permeability due to the openings formed between the narrow strip tapes, filament yarns, etc.
  • the above-mentioned woven and knitted fabrics generally have better air permeability than when laminated films are used alone, so there is a large temperature difference between the cultivation area and the ceiling at night, especially in the morning.
  • dew condensation occurs on the lower surface of the film, forming water droplets that hit the plants, thereby preventing discoloration and deterioration of fruits, leaves, flowers, etc. of the plants.
  • the woven or knitted fabric has openings formed therein, it is possible to avoid excessively blocking ultraviolet rays. Avoiding excessive shielding of ultraviolet rays may be effective, for example, in improving the coloration of fruits such as eggplants during growth, and in supporting normal pollination activities performed by bees in agricultural greenhouses.
  • the thickness of the filament yarn or the like is 0.01 to 0.30 times the width of the narrow strip tape, and the interval between adjacent narrow strip tapes is 0.01 to 0.30 times the width of the narrow strip tape. It can be increased by 1 to 0.5 times.
  • filament yarn etc. refers to filament yarn or spun yarn.
  • the filament yarn may be either a monofilament yarn or a multifilament yarn, and is not particularly limited.
  • a thin strip tape (warp) 11 obtained by cutting a laminated film into strips (slit processing) is woven with filament threads or the like (weft) 12. .
  • filament threads or the like (weft) 12 Specify the thickness A of the filament yarn, etc. (weft) 12, the width B of the narrow strip tape (warp) 11, the interval C between adjacent filament yarns, etc. (weft) 12, and the interval D between adjacent narrow strip tapes (warp) 11.
  • the thickness of the filament yarn etc. (weft) 12 is set to 0.01 to 0.30 times the width of the narrow strip-like tape (warp) 11, and ) 11 is set to 0.1 to 0.5 times the width of the narrow strip tape (warp) 11, the porosity is set within an appropriate range, and compared to when the laminated film is used alone as it is, While ensuring comparably high total light transmittance and heat ray reflectance, ultraviolet transmittance can be set within an appropriate range.
  • the interval between adjacent filament yarns, etc. (weft yarns) 12 is in the range of 1.0 mm or more and 10 mm or less.
  • the width of the narrow strip tape (warp) 11 is preferably 1 mm or more and 10 mm or less, more preferably 2 mm or more and 6 mm or less, and even more preferably 3 mm or more and 5 mm or less.
  • the interval between the narrow strip tapes (warps) 11, that is, the distance between the edges of adjacent narrow strip tapes (warps) 11 is preferably 0.2 mm or more and 1.0 mm or less, more preferably 0.4 mm or more and 0.8 mm or less. , more preferably 0.5 mm or more and 0.7 mm or less.
  • (weft) 12 is preferably 0.05 mm or more and 0.35 mm or less, more preferably 0.1 mm or more and 0.3 mm or less, and even more preferably 0.15 mm or more and 0.25 mm or less.
  • the woven or knitted fabric of the present invention can be made by setting the width of the narrow strip tape, the thickness of the filament threads, the spacing between adjacent filament threads, and the spacing between adjacent strip tapes as described above. It is possible to set the ultraviolet transmittance within an appropriate range while ensuring high total light transmittance and heat ray reflectance that are comparable to those when the laminated film is used alone.
  • the porosity of the woven or knitted fabric formed from the laminated film is preferably 10% or more and 30% or less.
  • the "porosity" in the present invention is defined as the porosity of a 10 cm square part (area 100 cm 2 ) on one surface of a woven or knitted material when the back side is observed when the surface of this part is observed from the direction perpendicular to the surface.
  • the area that can be seen without obstruction is defined as an aperture, and the total area (Scm 2 ) of the aperture (referred to as the aperture area) is calculated using the formula: [S (cm 2 )/100 (cm 2 )] ⁇ 100. It's what I asked for.
  • the woven or knitted fabric of the present invention when the porosity is 10% or more, the woven or knitted fabric can have good air permeability.
  • the air heated during the day in the lower part of the agricultural greenhouse is can escape to the outside through the woven or knitted fabric.
  • the condensation that forms on the underside of the woven or knitted fabric becomes water droplets and hits the plants, causing discoloration and deterioration of the fruits, leaves, flowers, etc. of the plants.
  • the porosity is 30% or less, since the high total light transmittance and heat ray reflectance provided by the laminated film can be ensured.
  • the film for greenhouse horticulture of the present invention includes the above laminated film.
  • the above-mentioned film for greenhouse horticulture may contain the above-mentioned laminated film, and may be composed only of the above-mentioned laminated film, or may be provided with other known films or layers.
  • the film for greenhouse horticulture of the present invention has the above-mentioned configuration, so it does not block the growth of plants, has excellent heat shielding properties, and has particularly excellent handling properties such as film fit and foldability. Become something. Therefore, it is particularly suitable as a film for greenhouse horticulture, which is used for applications having opening/closing parts, folding parts, etc., among other things.
  • each layer of the film was determined by cutting out the laminated film to a length of 2 mm in the longitudinal direction and 2 cm in the width direction, fixing it in an embedding capsule, and then embedding it in an epoxy resin (manufactured by Refinetech Co., Ltd., Epomount).
  • the embedded sample was cut perpendicularly to the width direction using a microtome (ULTRACUT UCT, manufactured by LEICA) to obtain thin film sections with a thickness of 5 nm. It was observed and photographed using a transmission electron microscope (Hitachi S-4300) at an accelerating voltage of 100 kV, and the thickness (physical thickness) of each layer was measured from the photograph.
  • the thickness of each layer was measured, with the layer existing inside the multilayer structure being defined as the intermediate layer, and the layer existing on the outermost layer being defined as the outermost layer.
  • the layer is the first layer or the second layer can be determined by the aspect of the refractive index, but if this is difficult, it is also possible to determine by the electronic state by NMR analysis or TEM analysis. Moreover, the refractive index of each layer can also be determined from a single layer film having the same composition as each layer but having a thicker thickness.
  • the measurement was performed at 25° C. in an air atmosphere, and the incident angle of the measurement light was set to 0° or 30°.
  • the refractive index of the polyester constituting the first layer and the second layer was determined by measuring at a wavelength of 633 nm using a prism coupler manufactured by Metricon. The refractive index of each layer was measured by peeling off the film interface so that the layer concerned was exposed on the surface.
  • the cut out strip-shaped film was set in a loop stiffness tester (manufactured by Toyo Seiki Co., Ltd.), and the repulsive force due to the crushing resistance of the loop was measured at a chuck distance of 50 mm and a compression speed of 3.3 mm/sec (see FIG. 4).
  • the loop stiffness (mN/cm) was defined as the maximum value of the repulsive force obtained in the measurement divided by the width.
  • Loop stiffness refers to the repulsive force of the loop, which is measured by forming a loop using a film cut into strips of predetermined dimensions and compressing the loop by a predetermined amount in the radial direction. It serves as an indicator to represent.
  • polyester for the first layer and the protective layer is polyethylene-2,6-naphthalate (hereinafter referred to as "PEN") with an inherent viscosity (orthochlorophenol, 35°C) of 0.62 dl/g
  • polyester for the second layer is Cyclohexane dimethanol copolymerized polyethylene terephthalate (hereinafter referred to as "PETG”) having an intrinsic viscosity (orthochlorophenol, 35° C.) of 0.77 dl/g, which was prepared by copolymerizing 30 mol% of cyclohexanedimethanol, was prepared.
  • PETG Cyclohexane dimethanol copolymerized polyethylene terephthalate
  • the polyester for the first layer and the protective layer After drying the polyester for the first layer and the protective layer at 180°C for 5 hours, it was supplied to an extruder, and the PEN for the first layer was brought into a molten state at 290°C. After drying the second layer of PETG at 120° C. for 10 hours, it was fed into an extruder and heated to 230° C. to melt it.
  • the first layer of PEN and the second layer of PETG are alternately stacked, and the first layer and the PETG layer are stacked alternately.
  • the material was laminated using a multi-layer feedblock device, and while the layered state was maintained, it was guided to a die and cast onto a casting drum.
  • an unstretched multilayer laminate film having a protective layer consisting of a PEN layer as the outermost layer on both sides of the film and having a total number of layers in the laminate structure of 275 was prepared. Note that the supply amount was adjusted so that the thickness of the protective layer after stretching was as shown in Table 1. Further, the discharge amounts of the resins of the first layer and the second layer were adjusted so that the optical thickness ratio of the first layer and the second layer of the laminated structure excluding the protective layer were equal.
  • the unstretched film obtained as described above was preheated at 120°C, and further stretched 3.5 times in the longitudinal direction by heating with an IR heater at 900°C from 15 mm above between low speed and high speed rolls. . Subsequently, it was supplied to a tenter and stretched 4.5 times in the transverse direction at 140°C.
  • the obtained biaxially oriented film was heat-set at a temperature of 190° C. for 30 seconds, and then subjected to 1.5% toe-in (relaxation) in the transverse direction.
  • the in-plane average refractive index after forming a film with this first layer resin was 1.760.
  • the in-plane average refractive index after forming a film with the resin for the second layer was 1.580.
  • the obtained multilayer laminated polyester film had a total thickness of 50 ⁇ m, a multilayer laminated part was 35 ⁇ m, and the protective layers on the front and back sides were each 7.5 ⁇ m thick, so that the total thickness was 50 ⁇ m.
  • the front surface here refers to the casting roll side (Front surface), and the back surface refers to the opposite side (Back surface).
  • the thickness of the protective layer on the front and back surfaces is the same. Note that these thicknesses can be adjusted by adjusting the supply amount, the discharge amount of the first and second layers, and the flow path diameter.
  • the transmittance of the obtained multilayer laminated polyester film at a wavelength of 700 nm at an incident angle of 0° was 76.5%, and the transmittance at each other wavelength is shown in Table 1. Further, the layer structure, film forming conditions, and physical properties of the obtained film are shown in Table 1.
  • Examples 2 to 13, Comparative Example 1 The same operations as in Example 1 were repeated, except that the protective layer thickness, the thickness of the multilayer laminate part, and the ratio of the optical thickness were adjusted as shown in Table 1. The obtained film was evaluated in the same manner as in Example 1.
  • the laminated film of the example of the present invention has higher visible region transmission performance than the film of the comparative example, and effectively transmits near ultraviolet light with high solar heat energy without blocking the growth of plants. It was found that it can be cut, has excellent heat shielding properties, and has excellent handling properties.
  • polyester for the first layer and the protective layer is polyethylene-2,6-naphthalate (hereinafter referred to as "PEN") with an inherent viscosity (orthochlorophenol, 35°C) of 0.62 dl/g
  • polyester for the second layer is Cyclohexane dimethanol copolymerized polyethylene terephthalate (hereinafter referred to as "PETG”) having an intrinsic viscosity (orthochlorophenol, 35° C.) of 0.77 dl/g, which was prepared by copolymerizing 30 mol% of cyclohexanedimethanol, was prepared.
  • PETG Cyclohexane dimethanol copolymerized polyethylene terephthalate
  • the polyester for the first layer and the protective layer After drying the polyester for the first layer and the protective layer at 180°C for 5 hours, it was supplied to an extruder, and the PEN for the first layer was brought into a molten state at 290°C. After drying the second layer of PETG at 120° C. for 10 hours, it was fed into an extruder and heated to 230° C. to melt it.
  • the first layer of PEN and the second layer of PETG are alternately stacked, and the first layer and the PETG layer are stacked alternately.
  • the material was laminated using a multi-layer feedblock device, and while the layered state was maintained, it was guided to a die and cast onto a casting drum.
  • an unstretched multilayer laminate film having a protective layer consisting of a PEN layer as the outermost layer on both sides of the film and having a total number of layers in the laminate structure of 275 was prepared. Note that the supply amount was adjusted so that the thickness of the protective layer after stretching was as shown in Table 1. Further, the discharge amounts of the resins of the first layer and the second layer were adjusted so that the optical thickness ratio of the first layer and the second layer of the laminated structure excluding the protective layer were equal.
  • the unstretched film obtained as described above was preheated at 120°C, and further stretched 3.5 times in the longitudinal direction by heating with an IR heater at 900°C from 15 mm above between low speed and high speed rolls. . Subsequently, it was supplied to a tenter and stretched 4.5 times in the transverse direction at 140°C.
  • the obtained biaxially oriented film was heat-set at a temperature of 190° C. for 30 seconds, and then subjected to 1.5% toe-in (relaxation) in the transverse direction.
  • the resulting multilayer laminated polyester film had a total thickness of 50 ⁇ m, a multilayer laminated portion of 35 ⁇ m, and a total thickness of 50 ⁇ m was achieved by providing protective layers on the front and back surfaces each with a thickness of 7.5 ⁇ m.
  • the front surface here refers to the casting roll side (front surface), and the back surface is the opposite side (back surface), and unless otherwise specified, the protective layers on the front and back surfaces are the same thickness. These thicknesses can be adjusted by adjusting the supply amount, the discharge amount of the first and second layers, and the flow path diameter.
  • the transmittance of the obtained multilayer laminated polyester film at a wavelength of 700 nm at an incident angle of 0° was 76.5%, and the transmittance at each other wavelength is shown in Table 1. Further, the layer structure, film forming conditions, and physical properties of the obtained film are shown in Table 1.
  • Examples 2 to 12, Comparative Examples 1 to 3 The same operations as in Example 1 were repeated, except that the protective layer thickness, the thickness of the multilayer laminate part, and the ratio of the optical thickness were adjusted as shown in Table 1. The obtained film was evaluated in the same manner as in Example 1.
  • the laminated film of the example of the present invention has higher visible region transmission performance than the film of the comparative example, and effectively transmits near ultraviolet light with high solar heat energy without blocking plant growth. It was found that it can be cut and has excellent heat shielding properties.

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PCT/JP2023/032991 2022-09-14 2023-09-11 積層フィルム、織編物、及び施設園芸用フィルム Ceased WO2024058100A1 (ja)

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EP23865453.7A EP4588653A1 (en) 2022-09-14 2023-09-11 Laminated film, woven/knitted fabric, and film for protected horticulture
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KR20250068617A (ko) 2025-05-16
TW202417253A (zh) 2024-05-01
US20260021650A1 (en) 2026-01-22

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