WO2011046344A2 - Infrared light shielding film - Google Patents

Infrared light shielding film Download PDF

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Publication number
WO2011046344A2
WO2011046344A2 PCT/KR2010/006966 KR2010006966W WO2011046344A2 WO 2011046344 A2 WO2011046344 A2 WO 2011046344A2 KR 2010006966 W KR2010006966 W KR 2010006966W WO 2011046344 A2 WO2011046344 A2 WO 2011046344A2
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WO
WIPO (PCT)
Prior art keywords
layer
infrared light
light shielding
shielding film
range
Prior art date
Application number
PCT/KR2010/006966
Other languages
French (fr)
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WO2011046344A3 (en
Inventor
Hyung Suk Pak
Gwan-Hyung Lee
Cheon Yong Joo
Yong Deuk Kim
Se Yoon Woo
Byoung Kuk Son
Dae Yong Shin
Original Assignee
Skc Co., Ltd.
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Publication date
Application filed by Skc Co., Ltd. filed Critical Skc Co., Ltd.
Publication of WO2011046344A2 publication Critical patent/WO2011046344A2/en
Publication of WO2011046344A3 publication Critical patent/WO2011046344A3/en

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Classifications

    • 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
    • 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
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (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
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/20—Filters
    • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/05—5 or more layers
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/24—All layers being polymeric
    • B32B2250/244—All polymers belonging to those covered by group B32B27/36
    • 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
    • B32B2250/00—Layers arrangement
    • B32B2250/42—Alternating layers, e.g. ABAB(C), AABBAABB(C)
    • 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
    • B32B2307/30—Properties of the layers or laminate having particular thermal properties
    • B32B2307/304—Insulating
    • 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
    • B32B2307/412—Transparent
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • 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
    • B32B2605/00—Vehicles
    • B32B2605/006—Transparent parts other than made from inorganic glass, e.g. polycarbonate glazings

Definitions

  • the present invention relates to an environmentally friendly film having a high visible light transmittance and a high shielding efficiency of infrared light, which is effective in lowering the energy consumption of various products containing glass articles.
  • a film made of a material that absorbs a specific infrared light range is attached to the glass surface for shielding heat energy.
  • a film suffers from the problems of reduced transparency caused by shielding some of the visible light region when the degree of infrared light shielding is raised, degradation of UV ray, and reduced heat shielding efficiency caused by the increased temperature of the film or glass due to the absorption of the infrared light, and, thus, it is not suitable for use as an exterior glass article of buildings or automotives.
  • an object of the present invention to provide an environmentally friendly film having a low infrared light transmittance, a high visible light transmittance, and a high heat shielding efficiency that may be coated on an exterior glass article of buildings or automotives, which lowers energy consumption by shielding the sunlight heat to reduce the interior temperature.
  • an infrared light shielding film comprising a reflective layer and a protective layer disposed on at least one side of the reflective layer, wherein:
  • the reflective layer is composed of alternating layers of layer A and layer B, the layer A being made of polyethylene terephthalate (PET) and the layer B, at least one material selected from the group consisting of poly(methyl methacrylate) (PMMA), polylactic acid (PLA), and polyethylene naphthalate (PEN), wherein:
  • the layer A to the layer B weight ratio is in the range of 1.5 : 1 to 1 : 1.5 ; and the value of Z obtained by the following formula is 1 or more,
  • X is the reflectance (%) of the film of the visible light in a wavelength in the range of 400nm to 500nm;
  • Y is the reflectance (%) of the film of the infrared light in a wavelength in the range of 900nm to l,000nm;
  • ⁇ is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 40% or more at a wavelength in the range of 300nm to 500nm;
  • Ad 2 is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 70% or more at a wavelength in the range of 900nm to l.OOOnm.
  • the infrared light shielding film in accordance with the present invention exhibits a high visible light transmittance and a high infrared light shielding efficiency since the film does not comprise a metallic material which absorbs or reflects infrared light.
  • a glass coated with the inventive film reduces the interior temperature by shielding sunlight heat and thus lowers the energy consumption by reducing the air conditioner use in buildings or automotives.
  • FIG. 1 a schematic view of an embodiment of the infrared light shielding film according to the present invention
  • FIGS. 2 to 10 results of light irradiation simulation tests of the infrared light shielding films obtained in Examples 1 to 9, respectively;
  • FIGS. 11 to 13 results of light irradiation simulation tests of the infrared light shielding films obtained in Comparative Examples 1 to 3, respectively.
  • the infrared light shielding film according to the present invention comprises a reflective layer and a protective layer disposed on at least one side of the reflective layer.
  • the protective layer comprises polyethylene terephthalate and the thickness thereof is preferably in the range of lum to 15um, more 10 006966
  • the thickness of the protective layer is within the above range, the interlayer uniformity in the reflective layer may be attained.
  • the reflective layer is composed of alternating layers of layer A and layer B, the layer A being made of polyethylene terephthalate and the layer B, at least one material selected from the group consisting of poly(methyl methacrylate), polylactic acid, and polyethylene naphthalate.
  • the layer A to the layer B weight ratio of the reflective layer is in the range of 1.5:1 to 1:1.5, preferably 1.2:1 to 1 :1.2.
  • the film may have a reflectance of 70% or more of the infrared light in a wavelength in the range of 900nm to ⁇ , ⁇ and a reflectance of less than 40% of visible light in a wavelength in the range of 400nm to 700nm.
  • the polyethylene terephthalate of the layer A in the reflective layer preferably has a crystallinity of 0% to 80%, more preferably 10% to 70%, most preferably 40% to 60%.
  • the shielding efficiency in the region of infrared light and high order or ⁇ ⁇ order reflections caused by characteristics of the light have to be considered.
  • the reflectance of the infrared light needs to be 50% or more in a wavelength in the range of 900nm to l,000nm and the visible light reflectance needs to be 40% or less in the region of high order or n* order reflection which provides the films with colors at certain wavelength as well as the reduced transparency.
  • the present invention is characterized in that the value of Z obtained by the following formula is 1 or more, preferably 1.25 or more, more preferably 1.5 or more: P T/K 2010/006966
  • X is the reflectance (%) of the film of the visible light in a wavelength in the range of 400nm to 500nm;
  • Y is the reflectance (%) of the film of the infrared light in a wavelength in the range of 900nm to l,000nm;
  • ⁇ is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 40% or more at a wavelength in the range of 300nm to 500nm;
  • Ad 2 is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 70% or more at a wavelength in the range of 900nm to l,000nm.
  • the difference between refractive indexes of layer A and layer B is preferably 0.05 or more.
  • the difference between refractive indexes may increase by alignment process.
  • inventive infrared light shielding film may be biaxially drawn, and the draw ratio is preferably 2 to 5, more preferably 3 to 4.5, in both the longitudinal and transverse directions.
  • the thickness of the infrared light shielding film is not limited, but, it is preferably lOum to lOOum, more preferably 20pm to 40um.
  • the layers A and B of the present invention may be laminated while the difference between thicknesses of the layers A and B is constant or gradually increased.
  • the former can increase the reflectance (%) of infrared light and the latter can extend the reflective region (nm) in the wavelength of infrared light.
  • the reflective layer is preferably composed of 50 to 400 alternating layers, more preferably 70 to 150 layers.
  • the reflective layer is within the above range, the reflectance of visible light may be minimized and the object of the present invention, i.e., reflectance of 70% or more in the specific infrared light range, may be attained.
  • the total thickness of the reflective layer is preferably ⁇ to lOOum, more preferably 14 ⁇ to 28 urn.
  • the thickness of the each layer, i.e., layer A or B, in the reflective layer is preferably 60nm to 800nm, more preferably 90nm to 200nm.
  • the inventive film can effectively shield the infrared light at a wavelength in the range of 800nm to 2,500nm.
  • the inventive film has a reflectance in a wavelength in the range of 900nm to 1 ,000nm of at least 70%, more preferably at least 80%.
  • the inventive infrared light shielding film preferably has a reflectance of less than 40%, more preferably less than 30%, in a wavelength of visible light (400-700nm.)
  • a film was cut into a 21.0cm (width) x 29.7cm (length) sample, the impurities adhered to the surface of the film were removed, and the visible light transmittance (%) was measured using a light transmission meter (NHD 5000W, Nippon Densho kukogy Co., Ltd.) in accordance with ASTM D 1003 method.
  • a film was cut into a 10cm (width) x 10cm (length) sample, the impurities adhered to the surface of the sample were removed, and the IR reflectance (%) was measured using a spectrometer (UltrascanTM pro, Hunterlab Inc.) in the reflection and transmission modes, respectively.
  • a PET resin having a crystallinity of at least 75% was vacuum-conditioned at 120°C for 2 hours or more, and further at 180°C for 3 hours or more.
  • the treated PET resin was heated to a temperature in the range of 200°C to 300°C to obtain a molten form thereof, which was introduced into a feed block using an extruder.
  • the two resins were extruded to form PET and PMMA layers.
  • the resulting PET and PMMA layers were alternately laminated to form a reflective layer composed of 143 layers, the first and last layers being PMMA layers.
  • the thickness of the reflective layer was 21 urn.
  • a 4.5um thick PET resin was coated on both sides of the reflective layer to protect the reflective layer and then drawn at a draw ratio of 3.5 in the longitudinal R2010/006966
  • Example 1 The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1.2:1.
  • Example 2 The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1 : 1.2.
  • Example 1 The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1 : 1.5.
  • Example 7 The procedures of the Example 1 were repeated except that the reflective layer was formed to be composed of 90 layers and have a thickness of 14.5um.
  • Example 7 The procedures of the Example 1 were repeated except that the reflective layer was formed to be composed of 90 layers and have a thickness of 14.5um.
  • Example 2 The procedures of the Example 1 were repeated except that the PET and PMMA layers were alternately laminated while the thickness of each pair of the two layers was gradually decreased by 2nm to form a reflective layer having a thickness of 20 ⁇ composed of 143 layers.
  • Example 1 The procedures of the Example 1 were repeated except for using a PLA resin instead of the PMMA resin.
  • Example 1 The procedures of the Example 1 were repeated except for using a PEN resin instead of the PMMA resin.
  • Example 2 The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1 :2.
  • Example 1 The procedures of the Example 1 were repeated except for using a PBT resin instead of the PMMA resin.
  • composition of the films obtained in Examples 1 to 9 and Comparative Examples 1 to 3 are shown in Table 1 below, and the results of the light irradiation simulation tests thereof are shown in FIGS. 2 to 13, respectively.
  • the visible light reflectance and infrared light reflectance of the films are shown in Table 2 below.
  • the inventive infrared light shielding film exhibits a high visible light transmittance and a high infrared light shielding efficiency, leading to a high heat shielding efficiency while a high transparency is maintained. Accordingly, the inventive film is preferred for using as a coating material on an exterior glass article of buildings or automotives. While the invention has been described with respect to the above specific embodiments, it should be recognized that various modifications and changes may be made to the invention by those skilled in the art which also fall within the scope of the invention as defined by the appended claims.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)

Abstract

An infrared light shielding film of the present invention comprising a reflective layer and a protective layer exhibits high visible light transmittance with high infrared light shielding efficiency; wherein, the reflective layer is composed of alternating layers of layer A and layer B, wherein the layer A is made of polyethylene terephthalate and the layer B, at least one material selected from the group consisting of poly(methyl methacrylate), polylactic acid, and polyethylene naphthalate; the layer A to the layer B weight ratio is in the range of 1.5 : 1 to 1 : 1.5; and the value of Z obtained by the following formula is 1 or more: Z = (Y/X) x (Δd2-Δdi) / Δd2, wherein X, Y, Δd1, and Δd2 are specifically defined in the specification.

Description

R2010/006966
INFRARED LIGHT SHIELDING FILM
FIELD OF THE INVENTION The present invention relates to an environmentally friendly film having a high visible light transmittance and a high shielding efficiency of infrared light, which is effective in lowering the energy consumption of various products containing glass articles. BACKGROUND OF THE INVENTION
There have recently been developed various films for reducing the indoor temperature by shielding sun's heat energy. For example, a film made of a material that absorbs a specific infrared light range is attached to the glass surface for shielding heat energy. However, such a film suffers from the problems of reduced transparency caused by shielding some of the visible light region when the degree of infrared light shielding is raised, degradation of UV ray, and reduced heat shielding efficiency caused by the increased temperature of the film or glass due to the absorption of the infrared light, and, thus, it is not suitable for use as an exterior glass article of buildings or automotives.
Also, there has been developed method of depositing or coating a metallic material on the glass. However, this method has disadvantages in that the metallic material shields the electronic waves in the communication region while shielding the infrared light, to cause malfunction of electronic devices in buildings and automotives and significantly reduce visible light transmittance to lower the transparency. 2010/006966
SUMMARY OF THE INVENTION
Accordingly, it is an object of the present invention to provide an environmentally friendly film having a low infrared light transmittance, a high visible light transmittance, and a high heat shielding efficiency that may be coated on an exterior glass article of buildings or automotives, which lowers energy consumption by shielding the sunlight heat to reduce the interior temperature.
In accordance with the present invention, there is provided an infrared light shielding film comprising a reflective layer and a protective layer disposed on at least one side of the reflective layer, wherein:
the reflective layer is composed of alternating layers of layer A and layer B, the layer A being made of polyethylene terephthalate (PET) and the layer B, at least one material selected from the group consisting of poly(methyl methacrylate) (PMMA), polylactic acid (PLA), and polyethylene naphthalate (PEN), wherein:
the layer A to the layer B weight ratio is in the range of 1.5 : 1 to 1 : 1.5 ; and the value of Z obtained by the following formula is 1 or more,
Z = (Y/X) x (Ad2-Ad / Ad2, in which:
X is the reflectance (%) of the film of the visible light in a wavelength in the range of 400nm to 500nm;
Y is the reflectance (%) of the film of the infrared light in a wavelength in the range of 900nm to l,000nm;
Αάι is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 40% or more at a wavelength in the range of 300nm to 500nm; and
Ad2 is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 70% or more at a wavelength in the range of 900nm to l.OOOnm.
The infrared light shielding film in accordance with the present invention exhibits a high visible light transmittance and a high infrared light shielding efficiency since the film does not comprise a metallic material which absorbs or reflects infrared light. A glass coated with the inventive film reduces the interior temperature by shielding sunlight heat and thus lowers the energy consumption by reducing the air conditioner use in buildings or automotives.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other objects and features of the present invention will become apparent from the following description of the invention, when taken in conjunction with the accompanying drawings, which respectively show:
FIG. 1 : a schematic view of an embodiment of the infrared light shielding film according to the present invention;
FIGS. 2 to 10: results of light irradiation simulation tests of the infrared light shielding films obtained in Examples 1 to 9, respectively; and
FIGS. 11 to 13: results of light irradiation simulation tests of the infrared light shielding films obtained in Comparative Examples 1 to 3, respectively.
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a detailed description of the present invention is given.
The infrared light shielding film according to the present invention comprises a reflective layer and a protective layer disposed on at least one side of the reflective layer. The protective layer comprises polyethylene terephthalate and the thickness thereof is preferably in the range of lum to 15um, more 10 006966
preferably 3.5um to 5.0um. When the thickness of the protective layer is within the above range, the interlayer uniformity in the reflective layer may be attained.
The reflective layer is composed of alternating layers of layer A and layer B, the layer A being made of polyethylene terephthalate and the layer B, at least one material selected from the group consisting of poly(methyl methacrylate), polylactic acid, and polyethylene naphthalate.
The layer A to the layer B weight ratio of the reflective layer is in the range of 1.5:1 to 1:1.5, preferably 1.2:1 to 1 :1.2. When the weight ratio is within the above range, the film may have a reflectance of 70% or more of the infrared light in a wavelength in the range of 900nm to Ι,ΟΟΟηιη and a reflectance of less than 40% of visible light in a wavelength in the range of 400nm to 700nm.
The polyethylene terephthalate of the layer A in the reflective layer preferably has a crystallinity of 0% to 80%, more preferably 10% to 70%, most preferably 40% to 60%.
In order that an infrared light shielding film is commercially available, there are various physical properties to be considered. Particularly, the shielding efficiency in the region of infrared light and high order or ηΛ order reflections caused by characteristics of the light have to be considered. Preferably, the reflectance of the infrared light needs to be 50% or more in a wavelength in the range of 900nm to l,000nm and the visible light reflectance needs to be 40% or less in the region of high order or n* order reflection which provides the films with colors at certain wavelength as well as the reduced transparency.
Accordingly, the present invention is characterized in that the value of Z obtained by the following formula is 1 or more, preferably 1.25 or more, more preferably 1.5 or more: P T/K 2010/006966
Z = (Y/X) x (Ad2-Adi) / Ad2, in which:
X is the reflectance (%) of the film of the visible light in a wavelength in the range of 400nm to 500nm;
Y is the reflectance (%) of the film of the infrared light in a wavelength in the range of 900nm to l,000nm;
Αάι is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 40% or more at a wavelength in the range of 300nm to 500nm; and
Ad2 is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 70% or more at a wavelength in the range of 900nm to l,000nm.
According to the infrared light shielding film of the present invention, the difference between refractive indexes of layer A and layer B is preferably 0.05 or more. The difference between refractive indexes may increase by alignment process.
Further, the inventive infrared light shielding film may be biaxially drawn, and the draw ratio is preferably 2 to 5, more preferably 3 to 4.5, in both the longitudinal and transverse directions.
The thickness of the infrared light shielding film is not limited, but, it is preferably lOum to lOOum, more preferably 20pm to 40um. The layers A and B of the present invention may be laminated while the difference between thicknesses of the layers A and B is constant or gradually increased. The former can increase the reflectance (%) of infrared light and the latter can extend the reflective region (nm) in the wavelength of infrared light.
According to the infrared light shielding film of the present invention, the reflective layer is preferably composed of 50 to 400 alternating layers, more preferably 70 to 150 layers. When the reflective layer is within the above range, the reflectance of visible light may be minimized and the object of the present invention, i.e., reflectance of 70% or more in the specific infrared light range, may be attained.
The total thickness of the reflective layer is preferably ΙΟμιτι to lOOum, more preferably 14μιτι to 28 urn.
Further, the thickness of the each layer, i.e., layer A or B, in the reflective layer is preferably 60nm to 800nm, more preferably 90nm to 200nm.
The inventive film can effectively shield the infrared light at a wavelength in the range of 800nm to 2,500nm. Preferably, the inventive film has a reflectance in a wavelength in the range of 900nm to 1 ,000nm of at least 70%, more preferably at least 80%.
Further, the inventive infrared light shielding film preferably has a reflectance of less than 40%, more preferably less than 30%, in a wavelength of visible light (400-700nm.)
Hereinafter, the present invention is described more specifically by the following examples but these are provided only for illustrations and the present invention is not limited thereto. Evaluation methods
Each of the films obtained in Examples 1 to 9 and Comparative Examples 1 to 3 was evaluated by the following methods. (1) Visible light reflectance
A film was cut into a 21.0cm (width) x 29.7cm (length) sample, the impurities adhered to the surface of the film were removed, and the visible light transmittance (%) was measured using a light transmission meter (NHD 5000W, Nippon Densho kukogy Co., Ltd.) in accordance with ASTM D 1003 method. The visible light reflectance was calculated using the following equation: Reflectance (%) = 100 - Transmittance (%).
(2) IR reflectance
A film was cut into a 10cm (width) x 10cm (length) sample, the impurities adhered to the surface of the sample were removed, and the IR reflectance (%) was measured using a spectrometer (Ultrascan™ pro, Hunterlab Inc.) in the reflection and transmission modes, respectively.
Example 1
A PET resin having a crystallinity of at least 75% was vacuum-conditioned at 120°C for 2 hours or more, and further at 180°C for 3 hours or more. The treated PET resin was heated to a temperature in the range of 200°C to 300°C to obtain a molten form thereof, which was introduced into a feed block using an extruder. A PMMA resin (normal grade, LG Chem.) obtained by heating at a temperature in the range of 200°C to 260°C was also introduced into the feed block using an extruder.
While keeping the weight ratio of the two resins at 1:1, the two resins were extruded to form PET and PMMA layers. The resulting PET and PMMA layers were alternately laminated to form a reflective layer composed of 143 layers, the first and last layers being PMMA layers. The thickness of the reflective layer was 21 urn.
A 4.5um thick PET resin was coated on both sides of the reflective layer to protect the reflective layer and then drawn at a draw ratio of 3.5 in the longitudinal R2010/006966
direction and at a draw ratio of 4.5 in the transverse direction to obtain a biaxially drawn film having a thickness of 30μηι.
Example 2
The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1.2:1.
Example 3
The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1.5:1.
Example 4
The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1 : 1.2.
Example 5
The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1 : 1.5.
Example 6
The procedures of the Example 1 were repeated except that the reflective layer was formed to be composed of 90 layers and have a thickness of 14.5um. Example 7
The procedures of the Example 1 were repeated except that the PET and PMMA layers were alternately laminated while the thickness of each pair of the two layers was gradually decreased by 2nm to form a reflective layer having a thickness of 20μιη composed of 143 layers.
Example 8
The procedures of the Example 1 were repeated except for using a PLA resin instead of the PMMA resin.
Example 9
The procedures of the Example 1 were repeated except for using a PEN resin instead of the PMMA resin.
Comparative Example 1
The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 1 :2.
Comparative Example 2
The procedures of the Example 1 were repeated except that the weight ratio of the PET to PMMA resins was 2:1. Comparative Example 3
The procedures of the Example 1 were repeated except for using a PBT resin instead of the PMMA resin.
The composition of the films obtained in Examples 1 to 9 and Comparative Examples 1 to 3 are shown in Table 1 below, and the results of the light irradiation simulation tests thereof are shown in FIGS. 2 to 13, respectively. The visible light reflectance and infrared light reflectance of the films are shown in Table 2 below.
Table 1
Figure imgf000011_0001
P T/KR2010/006966
Table 2
Figure imgf000012_0001
As shown in Table 2, the inventive infrared light shielding film exhibits a high visible light transmittance and a high infrared light shielding efficiency, leading to a high heat shielding efficiency while a high transparency is maintained. Accordingly, the inventive film is preferred for using as a coating material on an exterior glass article of buildings or automotives. While the invention has been described with respect to the above specific embodiments, it should be recognized that various modifications and changes may be made to the invention by those skilled in the art which also fall within the scope of the invention as defined by the appended claims.

Claims

WHAT IS CLAIMED IS
1. An infrared light shielding film comprising a reflective layer and a protective layer disposed on at least one side of the reflective layer, wherein:
the reflective layer is composed of alternating layers of layer A and layer B, the layer A being made of polyethylene terephthalate and the layer B, at least one material selected from the group consisting of poly(methyl methacrylate), polylactic acid, and polyethylene naphthalate;
the layer A to the layer B weight ratio is in the range of 1.5:1 to 1 :1.5; and the value of Z obtained by the following formula is 1 or more,
Z = (Y/X) x (Ad2-Ad / Αά2, in which:
X is the reflectance (%) of the film of the visible light in a wavelength in the range of 400nm to 500nm;
Y is the reflectance (%) of the film of the infrared light in a wavelength in the range of 900nm to l.OOOnm;
Ad1 is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 40% or more at a wavelength in the range of 300nm to 500nm; and
Ad2 is the difference (nm) between the maximum and minimum wavelengths at which the film shows a reflectance of 70% or more at a wavelength in the range of 900nm to l,000nm.
2. The infrared light shielding film of claim 1, wherein Z is 1.25 or more.
3. The infrared light shielding film of claim 1, wherein Z is 1.5 or more.
4. The infrared light shielding film according to any one of claims 1 to 3, wherein the difference between refractive indexes of the layer A and the layer B is 0.05 or more.
5. The infrared light shielding film according to any one of claims 1 to 3, wherein the polyethylene terephthalate of the layer A in the reflective layer has a crystallinity of 0% to 80%.
6. The infrared light shielding film according to any one of claims 1 to 3, which is biaxially drawn at a draw ratio of 3 to 4.5 in both the longitudinal and transverse directions.
7. The infrared light shielding film according to any one of claims 1 to 3, wherein the layer A to the layer B weight ratio is in the range of 1.2: 1 to 1 : 1.2.
8. The infrared light shielding film according to any one of claims 1 to 3, wherein the thickness of the infrared light shielding film is ΙΟμηι to ΙΟΟμηι.
9. The infrared light shielding film according to any one of claims 1 to 3, wherein the difference between the thickness of the layers A and B is constant or gradually increased.
10. The infrared light shielding film according to any one of claims 1 to 3, wherein the reflective layer is composed of 50 to 400 alternating layers of layer A and layer B.
11. The infrared light shielding film according to any one of claims 1 to 3, wherein the thickness of the reflective layer is lOnm to lOOum.
PCT/KR2010/006966 2009-10-12 2010-10-12 Infrared light shielding film WO2011046344A2 (en)

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