WO2014010532A1 - 誘電多層膜構造を有する赤外遮蔽フィルム - Google Patents
誘電多層膜構造を有する赤外遮蔽フィルム Download PDFInfo
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- WO2014010532A1 WO2014010532A1 PCT/JP2013/068523 JP2013068523W WO2014010532A1 WO 2014010532 A1 WO2014010532 A1 WO 2014010532A1 JP 2013068523 W JP2013068523 W JP 2013068523W WO 2014010532 A1 WO2014010532 A1 WO 2014010532A1
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- dielectric multilayer
- multilayer film
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Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/28—Interference filters
- G02B5/281—Interference filters designed for the infrared light
- G02B5/282—Interference filters designed for the infrared light reflecting for infrared and transparent for visible light, e.g. heat reflectors, laser protection
-
- 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
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/20—Filters
- G02B5/22—Absorbing filters
- G02B5/223—Absorbing filters containing organic substances, e.g. dyes, inks or pigments
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B80/00—Architectural or constructional elements improving the thermal performance of buildings
Definitions
- the present invention relates to an infrared shielding film having a dielectric multilayer structure.
- a window film that is bonded to the surface of a building window glass or a car window glass is used. Especially in the summer, energy saving is achieved by reducing the use of cooling.
- an infrared absorption type film in which an infrared absorption layer containing an infrared absorber is applied to the film
- an infrared reflection type in which an infrared reflection layer is applied to the film
- a type of film having both functions are known.
- Japanese Patent Application Laid-Open No. 2002-210855 discloses a heat ray blocking resin composition having inorganic metal fine particles (tin oxide, ATO (antimony-doped tin oxide), ITO (tin-doped indium oxide), etc.) having heat ray absorption ability.
- An infrared absorption type film coated with is disclosed.
- U.S. Pat. No. 7,632,568 discloses a film having a coating in which a high refractive index layer and a low refractive index layer are alternately laminated and further having a layer containing ATO.
- US Pat. No. 6,391,400 discloses an infrared reflective film having a multilayer film in which the wavelength ranges reflected on one surface and the other surface of a support are different.
- fine particles having heat ray absorption ability In a heat ray shielding film having fine particles of inorganic metal having heat ray absorption ability, fine particles having heat ray absorption ability often have a very wide absorption wavelength region. As a result, it was often possible to easily produce a film with a simple layer structure, and it was possible to apply it relatively easily.
- a film with heat-absorbing ability is attached to the window, the film itself absorbs infrared rays and changes to heat energy. The heat raises the temperature of the glass and increases the distortion inside the glass. In particular, a temperature difference is likely to occur between the glass at the sash portion and the solar radiation portion of the window. This is because the portion sandwiched between the sashes of the glass is not directly exposed to solar radiation, and the temperature is less likely to rise than the solar radiation part to which the film is attached due to heat radiation to the sash.
- Thermal cracking is a phenomenon caused not only by heat rays centered on near infrared rays contained in solar radiation but also by heat rays centered on far infrared rays emitted from indoor heating, especially in winter when the outside temperature is low. While the sash portion is sufficiently cooled, the glass temperature of the film pasting portion rises due to heating heat, which may cause thermal cracking.
- a film such as U.S. Pat. No. 7,632,568 has a configuration in which an infrared light absorbing nanoparticle layer is provided adjacent to the alternating reflection layer, thereby allowing light in a wide wavelength range from near infrared to far infrared. Although it is shielded, it is reflected by the reflective layer in the wavelength range from about 850 nm to 1200 nm, and since light having a wavelength longer than that is absorbed by the infrared light absorbing layer, the heat absorption amount is large. There was a problem that the risk of thermal cracking was not sufficiently eliminated.
- an object of the present invention is to provide an infrared shielding film excellent in a heat insulating effect in summer and a heat retaining effect in winter.
- a further object of the present invention is to provide an infrared shielding film in which the risk of thermal cracking is reduced even when an infrared absorber is used, the attachment is simple, and the film peeling is reduced even during storage. It is.
- An infrared absorber is contained in any one layer other than A) and the dielectric multilayer film (B), and is installed so that the surface on which the dielectric multilayer film (A) is laminated faces the outdoor side. Shielding film.
- the first embodiment of the present invention has a dielectric multilayer film (A), a dielectric multilayer film (B), and a non-interference layer disposed between the dielectric multilayer film (A) and the dielectric multilayer film (B).
- the dielectric multilayer film (A) has a reflection maximum value of 50% or more in the wavelength region of 900 to 1100 nm
- the dielectric multilayer film (B) has a reflection maximum value in the wavelength region of 1200 to 2100 nm.
- the infrared multilayer is contained in any one layer other than the dielectric multilayer film (A) and the dielectric multilayer film (B), and the surface on which the dielectric multilayer film (A) is laminated is on the outdoor side. It is an infrared shielding film installed so as to face.
- the dielectric multilayer film (A), the dielectric multilayer film (B), the non-interference layer therebetween, and the infrared absorber by containing the dielectric multilayer film (A), the dielectric multilayer film (B), the non-interference layer therebetween, and the infrared absorber, it has an excellent infrared shielding property, and can be used for annual climate change.
- a suitable film is provided. That is, an infrared reflective film excellent in a heat insulating effect in summer and a heat retaining effect in winter is provided.
- the use of the dielectric multilayer film (A) having a specific reflectance prevents heat generation of the film, thereby reducing the risk of thermal cracking.
- an infrared shielding film having a thinner thickness is realized with a simple layer structure, it can be easily attached to a window glass or the like, and film peeling during storage can be prevented.
- the infrared shielding film of the present invention includes a dielectric multilayer film (A) and a dielectric multilayer film (B), and the dielectric multilayer film (A) is interposed between the dielectric multilayer film (A) and the dielectric multilayer film (B). And a non-interference layer for preventing the optical characteristics generated from the dielectric multilayer film (B) from interfering with each other.
- the dielectric multilayer film (B) is directly formed on the dielectric multilayer film (A) without providing a non-interference layer, the reflection characteristic as a new third layer as a whole is usually due to optical interaction with each other. Indicates. Therefore, the non-interference layer is necessary for forming an infrared shielding film that independently shows the reflection characteristics of the dielectric multilayer films (A) and (B).
- the dielectric multilayer film (A) according to the present invention has a reflection maximum value of 50% or more in the wavelength region of 900 to 1100 nm
- the dielectric multilayer film (B) according to the present invention has a wavelength region of 1200 to 2100 nm.
- the reflection maximum value referred to in the present invention refers to a value when the reflectance is maximum in the reflection spectrum in the wavelength range defined above.
- the shape of the reflection spectrum is not limited, and for example, in addition to the reflection maximum value, the reflection spectrum has a plurality of smaller peaks. It may be.
- the shape of the reflection spectrum itself is not limited as long as it has a reflection maximum value in the above range.
- the dielectric multilayer films (A) and (B) may have any reflection characteristics in other wavelength regions as long as the above requirements are satisfied.
- the dielectric multilayer film (A) may exhibit a certain degree of reflectance at 1200 to 2100 nm, which is the same as that of the dielectric multilayer film (B).
- the layer structure becomes thick and complicated. Therefore, the dielectric multilayer films (A) and (B) do not need to exhibit a high reflectance other than the above-described wavelength region range from the viewpoint of ease of production of the film and ease of attachment.
- any one layer other than the dielectric multilayer films (A) and (B) according to the present invention contains an infrared absorber.
- the dielectric multilayer film (A) according to the present invention is installed so as to face the outdoor side, that is, the dielectric multilayer film according to the present invention is disposed on the surface opposite to the surface of the non-interference layer on which the dielectric multilayer film (A) is disposed.
- (B) is installed so as to face the indoor side.
- the dielectric multilayer film (A) according to the present invention reflects heat rays (particularly near infrared light) from sunlight on the outdoor (outdoor or outdoor) side. Absorption can be suppressed, the risk of thermal cracking is reduced, and the load on the cooling equipment can also be reduced. Even if there is a heat ray that is not reflected by the dielectric multilayer film (A) according to the present invention, the infrared absorber contained in the infrared shielding film of the present invention plays a role of absorbing such infrared rays, An infrared shielding film that can shield infrared rays in a wider wavelength region and is more excellent in heat insulating effect is realized.
- the present invention can prevent the problem of thermal cracking such as window glass that has occurred in an infrared shielding film containing a conventional infrared absorber.
- the dielectric multilayer film (B) according to the present invention is emitted from indoor (indoor or in-car) heating, in addition to reducing the risk of thermal cracking against heat rays from sunlight as in summer.
- the layer containing the infrared absorber When the layer containing the infrared absorber is arranged, there is no particular limitation. However, if the layer containing the infrared absorber is arranged on the indoor side of the dielectric multilayer film (A), depending on the usage environment, the layer may be exposed from the outdoors in summer. It is preferable when it is desired to shield heat rays intensively. Further, in an environment in which the heat insulation effect in winter is important, it is preferable to dispose the layer containing the infrared absorber on the outdoor side of the dielectric multilayer film (B). Therefore, most preferably, an infrared absorber is included in the non-interference layer between the dielectric multilayer film (A) and the dielectric multilayer film (B) or a functional layer described later disposed therebetween. Thus, it is possible to more reliably obtain the heat ray shielding in summer and the heat insulation effect in winter.
- the present invention can realize an infrared shielding film suitable for annual climate change.
- the infrared shielding film of the present invention essentially has a function of reflecting infrared rays and a function of absorbing infrared rays.
- the infrared shielding film of the present invention includes a dielectric multilayer film (A), a dielectric multilayer film (B), a non-interference layer disposed between the dielectric multilayer film (A) and the dielectric multilayer film (B), What is necessary is just to contain an infrared absorber as an essential component, and you may further contain various functional layers as needed. For example, it is preferable to have a functional layer outside at least one of the dielectric multilayer film (A) or the dielectric multilayer film (B) according to the present invention.
- the film of this invention is suitable for installing and using for a window glass etc., there may be an adhesive layer etc. which fix a window glass and a film.
- the infrared absorber is contained in any one layer other than the dielectric multilayer film (A) and the dielectric multilayer film (B). Therefore, when a functional layer is provided, any of them may contain an infrared absorber.
- FIG. 1 is a schematic cross-sectional view schematically showing an infrared shielding film according to an embodiment of the present invention.
- the dielectric multilayer film (A) 1 according to the present invention is installed on the surface of the non-interference layer 3 on the outdoor side, and the surface on the indoor side of the non-interference layer 3 is related to the present invention.
- a dielectric multilayer film (B) 2 is provided.
- an adhesive layer 4 as a functional layer is installed between the dielectric multilayer film (A) 1 and the window glass 6, and a hard layer as a functional layer is formed on the outer surface of the dielectric multilayer film (B) 2.
- a coat layer 5 is provided. At this time, the infrared shielding film is constructed on the indoor side surface of the window glass 6.
- the infrared shielding film of the present invention may be applied to the surface of the window glass 6 on the outdoor side, and the adhesive layer 4 and the hard coat layer 5 as the functional layer in this case. Are respectively installed on the outer surface of the dielectric multilayer film (A) 1 and on the surface between the dielectric multilayer film (B) 2 and the indoor side.
- the infrared shielding film of this invention can be used for laminated glass. That is, on the surface of the non-interference layer 3 on the outdoor side, the dielectric multilayer film (A) 1 according to the present invention and the adhesive layer 4 as a functional layer are installed in this order. The dielectric multilayer film (B) 2 according to the present invention and the adhesive layer 4 as a functional layer are installed in this order, and the infrared shielding film can be applied between two window glass plates 6 to become a laminated glass.
- the dielectric multilayer film (A) it is preferable to install the dielectric multilayer film (A) so that the surface on which the dielectric multilayer film (A) is laminated is directed to the outdoor side, and is attached indoors.
- the dielectric multilayer film (A), the non-interference layer, and the dielectric multilayer film (B) according to the present invention may be laminated in this order, and other functional layers may be arbitrarily selected as long as the effects of the present invention are not impaired.
- the layers may be laminated.
- the transmittance in the visible light region shown in JIS R3160-1998 is 40% or more, preferably 60% or more.
- the infrared shielding film has an infrared region related to a rise in indoor temperature in the incident spectrum of direct sunlight, and the rise in the room temperature can be suppressed by shielding this.
- each energy from 760 nm when the total energy of the entire infrared region from the shortest infrared wavelength (760 nm) to the longest wavelength (3200 nm) is defined as 100 Looking at the cumulative energy up to the wavelength, the total energy from 760 to 1300 nm accounts for about 75% of the entire infrared region. Therefore, shielding this wavelength region has the most efficient energy saving effect in summer due to heat ray shielding.
- the infrared shielding film of the present invention is an optical film thickness and unit of a dielectric multilayer film so that the dielectric multilayer film (A) has a maximum value of reflection exceeding 50%, particularly in the near infrared wavelength region of 900 to 1100 nm. It is preferable to design the dielectric multilayer film so that the region has a reflection maximum value having a maximum reflectance of about 80% or more.
- the reflectance in the wavelength region of 900 to 1100 nm is 50% or more, it is possible to prevent the visible light from being largely reflected due to the wavelength shift due to the incident angle of light.
- the base of the reflectance extends to 760 to 1300 nm, the reflectance does not become zero even in a region other than 900 to 1100 nm. Therefore, it is possible to effectively reflect near infrared light. That is, the normal dielectric multilayer film exhibits a reflection characteristic in which the base of the reflectance spreads around the wavelength exhibiting the reflection maximum value. Therefore, when the dielectric multilayer film exhibiting the reflection maximum value in the near infrared wavelength region of 900 to 1100 nm is used. This film exhibits a certain degree of reflectance over the range of 760 to 1300 nm, which causes an increase in the room temperature, and can exhibit a high transmittance in the visible light region.
- the dielectric multilayer film may be designed as a dielectric multilayer film (B) so as to further have a reflection maximum value in a wavelength region of 1200 to 2100 nm. Even more preferred.
- the reflectance of the dielectric multilayer film (B) in the wavelength region of 1200 to 2100 nm is 20 to 50% of the maximum reflectance of the dielectric multilayer film (A) in the wavelength region of 900 to 1100 nm. That is, the reflectance of the reflection peak in the wavelength region of 1200 to 2100 nm is 20 to 50 of the maximum reflectance of the reflection peak in the wavelength region of 900 to 1100 nm so as not to prevent the heat rays from the sun from entering the room in winter. It is most preferred to design the dielectric multilayer so that it is%. In addition, it is preferable to design the dielectric multilayer film so that there are a total of 300 nm or more of wavelength regions exceeding the reflectance of 20% in the wavelength region of 1200 to 2100 nm.
- the total thickness of the infrared shielding film of the present invention is preferably 40 to 1000 ⁇ m, more preferably 50 to 500 ⁇ m.
- the dielectric multilayer film is formed by alternately laminating a layer having a low refractive index material (also referred to as a low refractive index layer) and a layer having a high refractive index material (also referred to as a high refractive index layer). Refers to the infrared shielding layer.
- the unit thickness of the dielectric multilayer film it is necessary to design the unit thickness of the dielectric multilayer film to be used and a unit in which a high refractive index layer and a low refractive index layer are laminated.
- a high refractive index layer having a refractive index of 1.9 or more, preferably 2.0 or more is used. It has been found that excellent properties can be obtained when six or more layers are laminated.
- the refractive index of the high refractive index becomes 1.9
- the reflectance of about 80% is obtained.
- the reflectance of the dielectric multilayer film is 60%.
- a reflectance of about 80% can be obtained.
- the dielectric multilayer film (A) according to the present invention since the target wavelength of the reflected light can be controlled by changing the configuration of the dielectric multilayer film, in order to obtain a desired reflection peak in the present invention, the dielectric multilayer film (A) according to the present invention and This can be realized by changing the thickness and the number of stacked layers of the high refractive index layer and the low refractive index layer used for each of the dielectric multilayer films (B).
- the dielectric multilayer film according to the present invention efficiently reflects near infrared rays of 900 to 1100 nm having a large solar light intensity distribution on the outdoor side surface.
- (A) was designed, and the dielectric multilayer film (B) according to the present invention was designed so as to reflect mid-infrared rays of 1200 to 2100 nm, which is said to feel warm on the indoor side.
- the thickness per layer of the high refractive index layer used is preferably 50 to 1220 nm, and more preferably 70 to 1220 nm.
- the thickness per layer of the low refractive index layer used is preferably 70 to 1350 nm, and more preferably 90 to 1330 nm.
- the total thickness of the dielectric multilayer film (A) according to the present invention is preferably 1 to 8 ⁇ m, more preferably 1.2 to 6 ⁇ m.
- the total number of the high refractive index layer and the low refractive index layer constituting the dielectric multilayer film (A) according to the present invention is four or more.
- the thickness per layer of the high refractive index layer used is preferably 70 to 1300 nm, and more preferably 90 to 1250 nm.
- the thickness per layer of the low refractive index layer used is preferably 80 to 1320 nm, and more preferably 90 to 1300 nm.
- the total thickness of the dielectric multilayer film (B) according to the present invention is preferably 1 to 8 ⁇ m, more preferably 1.2 to 6 ⁇ m.
- the ratio of the total film thickness of the dielectric multilayer film (A) and the dielectric multilayer film (B) is preferably within ⁇ 20%.
- the ratio of the total film thickness of the dielectric multilayer film (A) and the dielectric multilayer film (B) according to the present invention is preferably within ⁇ 20% from the viewpoint of warpage, and within ⁇ 15%. More preferably. If the ratio of the total film thickness is within the above range, it is possible to prevent deterioration of workability due to warping to window glass etc., and also to secondary workability when a functional layer is further formed on the dielectric multilayer film. Excellent.
- the total film thickness referred to here can be calculated based on the following formula (1) by observing the cross section of the infrared shielding film of the present invention with an electron microscope and SEM.
- the total number of the high refractive index layer and the low refractive index layer constituting the dielectric multilayer film (B) according to the present invention may be the same as or different from that of the dielectric multilayer film (A) according to the present invention. Although it is good, it is preferable that it is four or more layers.
- the high refractive index layer and the low refractive index layer constituting the dielectric multilayer film (A) and the dielectric multilayer film (B) according to the present invention will be described in detail.
- the refractive index of each layer or a mutual refractive index difference, or the material which comprises each layer, or content of the material the case of the dielectric multilayer film (A) according to the present invention and the dielectric multilayer film (B ) May be the same or different.
- the lowermost layer adjacent to the non-interference layer according to the present invention is a low refractive index layer, and the outermost layer is also a low refractive index layer.
- a certain layer configuration is preferred.
- the refractive index difference is increased, the number of stacks can be reduced, so that the haze of the infrared shielding film tends to decrease.
- the refractive index difference ⁇ n between the adjacent high refractive index layer and low refractive index layer is preferably 0.05 or more. More preferably, it is 15 or more.
- the upper limit is not particularly limited, but is preferably 0.65 or less.
- ⁇ n is larger than 0.65, the reflectance can be improved with a small number of layers, so that the reflection performance is improved, but at the same time, higher-order reflection occurring in the wavelength region other than the wavelength region where the reflection is desired is increased, resulting in performance unevenness. This is undesirable because it causes a change in performance, particularly with respect to film thickness variations.
- n ⁇ d wavelength / 4 when viewed as a single layer film
- the reflected light is controlled to be strengthened by the phase difference.
- reflectivity can be increased.
- n is the refractive index
- d is the physical film thickness of the layer
- n ⁇ d is the optical film thickness.
- this relationship is used to control the refractive index and film thickness of each layer to control the reflection of visible light and infrared light. That is, the reflectance in a specific wavelength region is increased by the refractive index of each layer, the film thickness of each layer, and the way of stacking each layer.
- the preferable refractive index of the high refractive index layer according to the present invention is 1.70 to 2.50, more preferably 1.80 to 2.20. Further, the preferred refractive index of the low refractive index layer according to the present invention is 1.10 to 1.60, more preferably 1.30 to 1.50.
- the high refractive index layer and the low refractive index layer according to the present invention preferably contain a metal oxide and a water-soluble polymer.
- Metal oxide particles Although it does not restrict
- the high refractive index material according to the present invention include titanium oxide, zirconium oxide, zinc oxide and the like, but the stability of the composition containing metal oxide particles for forming the high refractive index layer.
- titanium oxide is more preferably used.
- rutile type titanium oxide having a low photocatalytic activity and a high refractive index is particularly preferably used.
- Examples of the method for preparing titanium oxide used in the present invention are disclosed in, for example, JP-A-63-17221, JP-A-7-819, JP-A-9-165218, JP-A-11-43327, and the like. Reference can be made to the prepared preparation methods.
- the primary particle diameter of the titanium oxide fine particles used in the present invention is preferably 1 to 50 nm, more preferably 4 to 30 nm.
- a volume average particle size of 1 nm or more and 50 nm or less is preferable from the viewpoint of low haze and excellent visible light transmittance.
- the volume average particle size of the titanium oxide particles according to the present invention refers to a method of observing the particles themselves using a laser diffraction scattering method, a dynamic light scattering method, or an electron microscope, or a cross section or surface of the refractive index layer.
- the particle size of 1,000 arbitrary particles is measured by a method of observing the appearing particle image with an electron microscope, and particles having particle sizes of d1, d2,.
- titanium oxide and the above metal oxide may be mixed, or a plurality of types of titanium oxides may be mixed.
- the preferred titanium oxide content is 30 to 95% by mass, preferably 70 to 90%, based on the solid content of the high refractive index layer. % By mass. From the viewpoint of increasing the refractive index of the high refractive index layer, the higher the content of titanium oxide, the better.
- silica (silicon dioxide) particles are preferably used as the low refractive index material according to the present invention, and specific examples include synthetic amorphous silica and colloidal silica. Among them, it is particularly preferable to use an acidic colloidal silica sol.
- the silicon dioxide particles used in the present invention preferably have an average particle size of 100 nm or less.
- the average particle size of primary particles of silicon dioxide dispersed in the state of primary particles is preferably 20 nm or less, more preferably 10 nm or less.
- the average particle size of the secondary particles is preferably 30 nm or less from the viewpoint of low haze and excellent visible light transmittance.
- the content of the metal oxide in the low refractive index layer according to the present invention is preferably 30 to 95% by mass and more preferably 60 to 90% by mass with respect to 100% by mass of the solid content of the low refractive index layer.
- the content of the metal oxide as the low refractive index material is 30% by mass or more, the low refractive index layer can be lowered, and when the content is 95% by mass or less, the low refractive index layer Flexibility of the film is obtained, and it becomes easy to form a dielectric multilayer film.
- the high refractive index layer or the low refractive index layer constituting the dielectric multilayer film according to the present invention may contain a water-soluble polymer used in combination with the metal oxide particles described above.
- a common water-soluble polymer may be used for the high refractive index layer and the low refractive index layer according to the present invention.
- water-soluble polymers applicable to the present invention include synthetic polymers such as gelatin, polyvinyl alcohol, polyvinyl pyrrolidone, and polyethylene oxide, inorganic polymers, thickening polysaccharides, and the like.
- synthetic polymers such as gelatin, polyvinyl alcohol, polyvinyl pyrrolidone, and polyethylene oxide
- inorganic polymers such as polyvinyl alcohol and gelatin are particularly preferable.
- These water-soluble polymers may be one kind or a mixture of plural kinds.
- the water-soluble polymer according to the present invention is a polymer compound that dissolves 1% by mass or more in water or a warm water medium, and preferably 3% by mass or more.
- the content of the water-soluble polymer is preferably 30 to 80% by mass and more preferably 30 to 60% by mass with respect to the high refractive index layer or the low refractive index layer. If it is 30% by mass or more, the transparency of the coating tends to increase, and if it is 80% by mass or less, the high refractive index layer tends to have a higher refractive index and the low refractive index layer tends to have a lower refractive index. It is preferable.
- the weight average molecular weight of the water-soluble polymer according to the present invention is preferably 1,000 or more and 200,000 or less. Furthermore, 3,000 or more and 40,000 or less are more preferable.
- gelatin examples include acid-treated gelatin and alkali-treated gelatin, as well as enzyme-treated gelatin and gelatin derivatives that undergo enzyme treatment in the gelatin production process, that is, amino groups, imino groups, hydroxyl groups as functional groups in the molecule. It may be modified by treatment with a reagent having a group and a carboxyl group and a group obtained by reacting with it.
- Synthetic polymers applicable to the present invention include, for example, polyvinyl alcohols, polyvinyl pyrrolidones, alkylene oxides, polyacrylic acid, acrylic acid-acrylonitrile copolymer, potassium acrylate-acrylonitrile copolymer, vinyl acetate.
- -Acrylic resin such as acrylic ester copolymer or acrylic acid-acrylic ester copolymer, styrene-acrylic acid copolymer, styrene-methacrylic acid copolymer, styrene-methacrylic acid-acrylic ester copolymer Styrene acrylic acid resin such as styrene- ⁇ -methylstyrene-acrylic acid copolymer, or styrene- ⁇ -methylstyrene-acrylic acid-acrylic acid ester copolymer, styrene-sodium styrenesulfonate copolymer, styrene -2-Hydroxy Siethyl acrylate copolymer, styrene-2-hydroxyethyl acrylate-potassium styrene sulfonate copolymer, styrene-maleic acid copolymer, styren
- the polyvinyl alcohol preferably used in the present invention includes, in addition to ordinary polyvinyl alcohol obtained by hydrolyzing polyvinyl acetate, modified polyvinyl alcohol such as polyvinyl alcohol having a cation-modified terminal and anion-modified polyvinyl alcohol having an anionic group. Alcohol is also included.
- the polyvinyl alcohol obtained by hydrolyzing vinyl acetate preferably has an average degree of polymerization of 1,000 or more, and particularly preferably has an average degree of polymerization of 1,500 to 5,000.
- the degree of saponification is preferably 70 to 100%, particularly preferably 80 to 99.5%.
- Examples of the cation-modified polyvinyl alcohol have primary to tertiary amino groups and quaternary ammonium groups in the main chain or side chain of the polyvinyl alcohol as described in JP-A-61-10383.
- Polyvinyl alcohol which is obtained by saponifying a copolymer of an ethylenically unsaturated monomer having a cationic group and vinyl acetate.
- Examples of the ethylenically unsaturated monomer having a cationic group include trimethyl- (2-acrylamido-2,2-dimethylethyl) ammonium chloride and trimethyl- (3-acrylamido-3,3-dimethylpropyl) ammonium chloride.
- the ratio of the cation-modified group-containing monomer in the cation-modified polyvinyl alcohol is 0.1 to 10 mol%, preferably 0.2 to 5 mol%, relative to vinyl acetate.
- Anion-modified polyvinyl alcohol is, for example, polyvinyl alcohol having an anionic group as described in JP-A-1-206088, as described in JP-A-61-237681 and JP-A-63-307979, Examples thereof include a copolymer of vinyl alcohol and a vinyl compound having a water-soluble group, and modified polyvinyl alcohol having a water-soluble group as described in JP-A-7-285265.
- Nonionic modified polyvinyl alcohols include, for example, polyvinyl alcohol derivatives obtained by adding a polyalkylene oxide group to a part of vinyl alcohol as described in JP-A-7-9758, and described in JP-A-8-25795. And a block copolymer of a vinyl compound having a hydrophobic group and vinyl alcohol.
- Polyvinyl alcohol can be used in combination of two or more, such as the degree of polymerization and the type of modification.
- a curing agent when these polymers are used, a curing agent may be used.
- a curing agent for example, in the case of polyvinyl alcohol, boric acid and a salt thereof and an epoxy curing agent described later are preferable.
- (Curing agent) In the present invention, it is preferable to use a curing agent in order to cure the water-soluble polymer as a binder.
- the curing agent applicable to the present invention is not particularly limited as long as it causes a curing reaction with a water-soluble polymer.
- the water-soluble polymer is the aforementioned polyvinyl alcohol, boric acid and its salt are used. preferable.
- other known compounds can be used and are generally compounds having a group capable of reacting with a water-soluble polymer or compounds that promote the reaction between different groups of a water-soluble polymer.
- the polymer is appropriately selected according to the type of the conductive polymer.
- the curing agent include, for example, epoxy curing agents (diglycidyl ethyl ether, ethylene glycol diglycidyl ether, 1,4-butanediol diglycidyl ether, 1,6-diglycidyl cyclohexane, N, N-diglycidyl- 4-glycidyloxyaniline, sorbitol polyglycidyl ether, glycerol polyglycidyl ether, etc.), aldehyde curing agents (formaldehyde, glioxal, etc.), active halogen curing agents (2,4-dichloro-4-hydroxy-1,3,5) , -S-triazine, etc.), active vinyl compounds (1,3,5-trisacryloyl-hexahydro-s-triazine, bisvinylsulfonylmethyl ether, etc.), aluminum alum and the like.
- epoxy curing agents diglycidyl ethyl
- the water-soluble polymer is gelatin
- organic hardeners such as vinyl sulfone compounds, urea-formalin condensates, melanin-formalin condensates, epoxy compounds, aziridine compounds, active olefins, isocyanate compounds, etc.
- the film agent include inorganic polyvalent metal salts such as chromium, aluminum, and zirconium.
- the total amount of the curing agent used varies depending on the type of the water-soluble polymer, but is preferably 1 to 600 mg, more preferably 100 to 600 mg, per 1 g of the water-soluble polymer.
- a surfactant may be added to at least one of the high refractive layer and the low refractive index layer according to the present invention.
- the activator species any of anionic, cationic and nonionic types can be used.
- acetylene glycol-based nonionic surfactants, quaternary ammonium salt-based cationic surfactants and fluorine-based cationic surfactants are preferred.
- the addition amount of the surfactant according to the present invention is preferably in the range of 0.005 to 0.30% by mass as the solid content when each coating solution is 100% by mass, and more preferably, the amount of addition is 0.8.
- the content is preferably from 01 to 0.10% by mass.
- examples of the high refractive index layer and the low refractive index layer according to the present invention include those disclosed in JP-A-57-74193, JP-A-57-87988, and JP-A-62-261476.
- UV absorber sulfuric acid, phosphoric acid, acetic acid, citric acid, sodium hydroxide, potassium hydroxide, potassium carbonate and other pH adjusters, antifoaming agents, diethylene glycol and other lubricants, preservatives, antistatic agents, mats
- Various known additives such as an agent can also be contained.
- Non-interference layer In the non-interference layer according to the present invention, an arbitrary layer may be laminated between the dielectric multilayer film (A) according to the present invention and the non-interference layer, and the dielectric multilayer film (B) according to the present invention. An arbitrary layer may be laminated between the non-interfering layer and the non-interfering layer, but the dielectric multilayer film does not interfere with the optical characteristics generated from the dielectric multilayer film (A) and the dielectric multilayer film (B). It is essential to dispose the non-interference layer according to the present invention between (A) and the dielectric multilayer film (B).
- the dielectric multilayer film (A) and the dielectric multilayer film (B) are used in the present invention so as to reflect infrared rays in different wavelength regions.
- light has a coherence length (coherence distance), and it is known that interference does not occur when the optical path difference is sufficiently longer than the coherence length.
- Infrared light has a short coherence length and is said to be about a few microns. That is, in order to prevent interference between the reflected light generated in the dielectric multilayer film (A) according to the present invention and the reflected light generated in the dielectric multilayer film (B) according to the present invention, the optical path difference is set to be larger than several microns. do it.
- the thickness of the non-interference layer according to the present invention is 5 ⁇ m or more.
- the upper limit of the thickness is not particularly defined in terms of optical performance, it is preferably 500 ⁇ m or less, more preferably 100 ⁇ m or less from the viewpoint of flexibility as a film.
- the non-interference layer according to the present invention has a visible light transmittance of 85% or more, more preferably 90% or more, as shown in JIS R3106-1998. If the visible light transmittance is 85% or more, the transmittance in the visible light region shown in JIS R3106-1998 when the infrared shielding film of the present invention is used is 40% or more, preferably 60% or more. It is advantageous.
- the non-interference layer according to the present invention can be formed of a transparent material, and has a role of preventing the reflected light from the dielectric multilayer film (A) and the dielectric multilayer film (B) according to the present invention from interacting with each other. If it is a thing, it will not specifically limit, The structure formed by mixing and laminating
- Transparent materials applicable to the non-interference layer according to the present invention include, for example, methacrylic acid ester, polyethylene terephthalate (PET), polyethylene naphthalate (PEN), polycarbonate (PC), polyarylate, polystyrene (PS), aromatic
- the resin film include polyamide, polyether ether ketone, polysulfone, polyether sulfone, polyimide, and polyetherimide, and a resin film obtained by laminating two or more layers of the resin.
- the material described in the item of the above-mentioned water-soluble polymer can also be used preferably.
- the non-interference layer according to the present invention may be applied at the same time as the production of the dielectric multilayer film (A) and the dielectric multilayer film (B) according to the present invention, or may be applied separately by a method such as extrusion molding. Good.
- non-interference layer according to the present invention may contain an infrared absorber described later, and may also serve as a functional layer.
- a functional layer is provided outside at least one of the dielectric multilayer film (A) or the dielectric multilayer film (B).
- the infrared shielding film of the present invention has a conductive layer, an antistatic layer, a gas barrier layer, an easy adhesion layer (adhesion layer), an antifouling layer, a deodorizing layer, a droplet layer, an easy slip for the purpose of adding further functions.
- Layer abrasion-resistant layer, hard coat layer, antireflection layer, electromagnetic wave shielding layer, ultraviolet absorption layer, printing layer, fluorescent light emitting layer, hologram layer, release layer, adhesive layer, adhesive layer, high refractive index layer of the present invention and It has at least one functional layer such as an infrared cut layer (metal layer, liquid crystal layer) other than the low refractive index layer, a colored layer (visible light absorption layer), and an intermediate film layer used for laminated glass. These functional layers may also serve as the incoherent layer of the present invention. Moreover, it is preferable to have a functional layer outside at least one of the dielectric multilayer film (A) and the dielectric multilayer film (B) according to the present invention. For example, as shown in FIG.
- the window glass when the infrared film of the present invention is applied to an indoor window glass, the window glass may have an adhesive layer outside the corresponding dielectric multilayer film (A). It is preferable from the viewpoint of construction that is easy to adhere to, and having a hard coat layer outside the corresponding dielectric multilayer film (B) is preferable from the viewpoint of surface protection for enhancing the friction resistance.
- An adhesive layer can be provided on any outermost surface of the infrared shielding film of the present invention.
- Examples of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer according to the present invention include acrylic pressure-sensitive adhesives, silicon-based pressure-sensitive adhesives, urethane-based pressure-sensitive adhesives, polyvinyl butyral-based pressure-sensitive adhesives, and ethylene-vinyl acetate-based pressure-sensitive adhesives.
- the infrared shielding film of the present invention When the infrared shielding film of the present invention is pasted on a window glass, water is sprayed on the window, and the pasting method of matching the adhesive layer of the infrared shielding film on the wet glass surface, the so-called water pasting method is re-stretched, It is preferably used from the viewpoint of repositioning and the like. For this reason, an acrylic pressure-sensitive adhesive that has a weak adhesive force in the presence of water is preferably used.
- the acrylic pressure-sensitive adhesive to be used may be either solvent-based or emulsion-based, but a solvent-based pressure-sensitive adhesive is preferable because it can easily increase the adhesive strength and the like, and among them, those obtained by solution polymerization are preferable.
- This adhesive layer contains additives such as stabilizers, surfactants, UV absorbers, flame retardants, antistatic agents, antioxidants, thermal stabilizers, lubricants, fillers, coloring, adhesion modifiers, etc. It can also be made.
- additives such as stabilizers, surfactants, UV absorbers, flame retardants, antistatic agents, antioxidants, thermal stabilizers, lubricants, fillers, coloring, adhesion modifiers, etc.
- an ultraviolet absorber is also effective for suppressing deterioration of the infrared shielding film due to ultraviolet rays.
- the thickness of the pressure-sensitive adhesive layer according to the present invention is preferably 1 ⁇ m to 100 ⁇ m, more preferably 3 to 50 ⁇ m. If it is 1 micrometer or more, there exists a tendency for adhesiveness to improve and sufficient adhesive force is acquired. On the other hand, if the thickness is 100 ⁇ m or less, not only the transparency of the infrared shielding film is improved, but further, when the film is attached to the window glass and then peeled off, no cohesive failure occurs between the adhesive layers, and the glass surface is removed. There is a tendency for the adhesive material of this material to lose its stiffness.
- the adhesive layer according to the present invention may contain an infrared absorber described later.
- the hard coat layer according to the present invention may be laminated on both sides of the infrared shielding film of the present invention, or may be laminated on one side.
- Examples of the curable resin used in the hard coat layer according to the present invention include a thermosetting resin and an ultraviolet curable resin. From the viewpoint of easy molding, an ultraviolet curable resin is preferable, and among them, pencil hardness Is more preferably at least 2H. Such cured resins can be used singly or in combination of two or more.
- Examples of such an ultraviolet curable resin are synthesized from a polyfunctional acrylate resin such as acrylic acid or methacrylic acid ester having a polyhydric alcohol, and acrylic acid or methacrylic acid having a diisocyanate and a polyhydric alcohol.
- a polyfunctional acrylate resin such as acrylic acid or methacrylic acid ester having a polyhydric alcohol, and acrylic acid or methacrylic acid having a diisocyanate and a polyhydric alcohol.
- Examples of such polyfunctional urethane acrylate resins examples.
- polyether resins, polyester resins, epoxy resins, alkyd resins, spiroacetal resins, polybutadiene resins or polythiol polyene resins having an acrylate-based functional group can also be suitably used.
- these resins may contain a photosensitizer (radical polymerization initiator).
- These radical polymerization initiators are used in an amount of 0.5 to 20 parts by weight, preferably 1 to 15 parts by weight, based on 100 parts by weight of the polymerizable component of the resin.
- the above-mentioned curable resin may be blended with known general paint additives as necessary.
- a silicone-based or fluorine-based additive that imparts leveling, surface slip properties, etc. is effective in preventing scratches on the surface of the cured film, and when using ultraviolet rays as active energy rays, the additive air Bleeding to the interface can reduce the inhibition of curing of the resin by oxygen, and an effective degree of curing can be obtained even under low irradiation intensity conditions.
- the hard coat layer preferably contains inorganic fine particles.
- Preferable inorganic fine particles include fine particles of an inorganic compound containing a metal such as titanium, silica, zirconium, aluminum, magnesium, antimony, zinc or tin.
- the average particle size of the inorganic fine particles is preferably 1000 nm or less, and more preferably in the range of 10 to 500 nm, from the viewpoint of ensuring visible light transmittance.
- the inorganic fine particles have a higher bond strength with the cured resin forming the hard coat layer, and can be prevented from falling off the hard coat layer. Therefore, a photosensitive group having photopolymerization reactivity such as monofunctional or polyfunctional acrylate. Those in which is introduced into the surface are preferred.
- the thickness of the hard coat layer is preferably 0.1 ⁇ m to 50 ⁇ m, more preferably 1 to 20 ⁇ m. If it is 0.1 ⁇ m or more, the hard coat property tends to be improved. Conversely, if it is 50 ⁇ m or less, the transparency of the infrared shielding film tends to be improved.
- the hard coat layer may contain an infrared absorber described later.
- the method for forming the hard coat layer is not particularly limited. For example, after preparing a coating liquid for hard coat layer containing the above components, the coating liquid is applied with a wire bar or the like, and the coating liquid is cured with heat and / or UV. And a method of forming a hard coat layer.
- an infrared absorber is included in any one layer other than the dielectric multilayer film (A) and dielectric multilayer film (B) which concern on this invention.
- the infrared absorber is contained in a layer between the dielectric multilayer film (A) and the dielectric multilayer film (B). That is, it is more preferable that an infrared absorber is included in the layer between the dielectric multilayer film (A) and the dielectric multilayer film (B) according to the present invention. Furthermore, by including an infrared absorber in the non-interference layer according to the present invention, the remaining infrared rays not reflected among the infrared rays incident on the dielectric multilayer film (A) or (B) include the infrared absorber.
- the amount of infrared absorption in the entire film can be reduced, and the temperature rise can be reduced, which is most preferable.
- an infrared absorber in combination, infrared rays that cannot be reflected by the dielectric multilayer film (A) or (B) can be blocked, so that an infrared blocking effect in a wider wavelength range can be obtained as an infrared shielding film.
- the dielectric multilayer film (A) has a near-infrared reflectance of a specific value or more, even if an infrared absorber is used in combination with an infrared shielding film, The risk of cracking is very low.
- the reflection band of the dielectric multilayer film is usually narrower than that of the infrared region. It is necessary to devise a way to stack and expand the band. For this reason, the number of manufacturing steps is increased and complicated, and the cost is increased.
- an infrared absorber is used in combination.
- the infrared absorber used in the present invention is not particularly limited as long as it is an infrared absorber generally used by adding to a transparent resin, but a solution in which 0.1 part by weight of a compound is dissolved in 100 parts by weight of a good solvent.
- a compound having a light transmittance of 50% or less, more preferably 30% or less, in the near infrared wavelength region of 600 to 2500 nm, in the whole or in the whole region, with respect to the good solvent is preferable.
- infrared absorbers examples include cyan near infrared absorbers, pyrylium near infrared absorbers, squarylium near infrared absorbers, croconium near infrared absorbers, and azurenium near infrared absorbers.
- Agent phthalocyanine near infrared absorber, dithiol metal complex near infrared absorber, naphthoquinone near infrared absorber, anthraquinone near infrared absorber, indophenol near infrared absorber, and adi near infrared Examples thereof include infrared absorbers disclosed in JP-A-6-2001113, such as an external absorber.
- KAYASORB IR-750 KAYASORB IRG-002, KAYASORB IRG-023, IR-820B, KAYASORB IRG-022, KAYASORB IRG-023, KAYASORB CY-2, KAYASORB cCY-4, KAYOR9 Can also be used.
- infrared absorbers other than the above, tin-doped indium oxide (ITO), antimony-doped tin oxide (ATO), zinc antimonate, lanthanum hexaboride (LaB 6 ), tungsten cesium oxide (Cs 0.33 WO 3 ), etc.
- ITO tin-doped indium oxide
- ATO antimony-doped tin oxide
- LaB 6 zinc antimonate
- LaB 6 lanthanum hexaboride
- Cs 0.33 WO 3 tungsten cesium oxide
- the content of the infrared absorber used in the present invention in the corresponding layer depends on the extinction coefficient that varies depending on the type of infrared absorber, the particle size, and the like, so that the amount added can be controlled as necessary. .
- ATO antimony-doped tin oxide
- it is preferably 3 g / m 2 or more.
- the method for producing the infrared shielding film of the present invention is not particularly limited, and the dielectric multilayer film (A) and the high refractive index layer in which the high refractive index layer and the low refractive index layer are alternately laminated on both surfaces of the non-interference layer. Any method can be used as long as the dielectric multilayer film (B) can be formed by alternately laminating and low refractive index layers.
- a non-interference layer according to the present invention is formed from the material of the non-interference layer, and then a dielectric multilayer film in which high refractive index layers and low refractive index layers are alternately laminated ( Apply either A) or dielectric multilayer film (B) and dry, then apply the other dielectric multilayer film to the back side of the non-interference layer and dry it as necessary on each side (2) Dielectric multilayer films (A) and (B) are simultaneously applied to both sides of the formed non-interference layer and dried, and then applied to the respective surfaces.
- Examples of the coating method include a roll coating method, a rod bar coating method, an air knife coating method, a spray coating method, a curtain coating method, or US Pat. Nos. 2,761,419 and 2,761,791.
- a slide bead coating method using an hopper, an extrusion coating method, or the like is preferably used.
- polystyrene film polyethylene, polypropylene, etc.
- polyester film polyethylene terephthalate, polyethylene naphthalate, etc.
- Polyvinyl chloride, cellulose triacetate and the like can be used, and a polyester film is preferable.
- the thickness of the support used in the present invention is preferably 10 to 300 ⁇ m, particularly 20 to 150 ⁇ m.
- the support body of this invention may be what piled up two sheets, and the kind may be the same or different in this case.
- a support may be placed between the non-interference layer and the dielectric multilayer film (A) or (B).
- the solvent for preparing the coating solution for forming the high refractive index layer and the coating solution for forming the low refractive index layer is not particularly limited, but water, an organic solvent, or a mixed solvent thereof is preferable. From the viewpoint of environment and simplicity of operation, the solvent of the coating solution is preferably water or a mixed solvent of water and methanol, ethanol, or ethyl acetate, and more preferably water.
- the concentration of the water-soluble polymer in the coating solution for forming a high refractive index layer is preferably 1 to 10% by mass.
- the concentration of the metal oxide particles in the coating solution for forming a high refractive index layer is preferably 1 to 50% by mass.
- the concentration of the water-soluble polymer in the coating solution for forming the low refractive index layer is preferably 1 to 10% by mass.
- the concentration of the metal oxide particles in the coating solution for forming the low refractive index layer is preferably 1 to 50% by mass.
- the viscosity of the coating solution for forming a high refractive index layer and the coating solution for forming a low refractive index layer when performing simultaneous multilayer coating is preferably in the range of 5 to 100 mPa ⁇ s when the slide bead coating method is used.
- the range is preferably 10 to 50 mPa ⁇ s.
- the range of 5 to 1200 mPa ⁇ s is preferable, and the range of 25 to 500 mPa ⁇ s is more preferable.
- a water-based coating solution for forming a high refractive index layer and a coating solution for forming a low refractive index layer are heated to 30 ° C. or more and applied, and then the temperature of the formed coating film is set to 1. It is preferable that the temperature is once cooled to -15 ° C and dried at 10 ° C or more, and more preferably, the drying conditions are wet bulb temperature 5-50 ° C and film surface temperature 10-50 ° C. . Moreover, as a cooling method immediately after application
- Any known method can be used as a method for applying the adhesive. These can be appropriately formed into a solution in a solvent capable of dissolving the pressure-sensitive adhesive, or can be applied using a dispersed coating solution, and known solvents can be used.
- the pressure-sensitive adhesive layer according to the present invention may be applied directly to the infrared shielding film of the present invention, or once coated on the release film and dried, the infrared shielding film of the present invention is then applied. In addition, the adhesive may be transferred.
- the formation method of other functional layers such as a hard coat layer according to the present invention is not particularly limited, but any known method can be used.
- ultraviolet rays in a wavelength region of 100 to 400 nm emitted from an ultra high pressure mercury lamp, a high pressure mercury lamp, a low pressure mercury lamp, a carbon arc, a metal halide lamp, etc. are irradiated, or a scanning type or curtain type electron beam accelerator.
- the infrared shielding body of the present invention represents an embodiment in which the infrared shielding film of the present invention is provided on at least one surface of a substrate.
- the substrate a plastic substrate, a metal substrate, a ceramic substrate, a cloth substrate and the like are preferable, and the infrared shielding film of the present invention is applied to a substrate in various forms such as a film shape, a plate shape, a spherical shape, a cubic shape, and a rectangular parallelepiped shape.
- a plate-shaped ceramic substrate is preferable, and an infrared shielding body in which the infrared shielding film of the present invention is provided on a glass plate is preferable.
- the glass plate include float plate glass and polished plate glass described in JIS R3202, for example, and the glass thickness is preferably 0.01 mm to 20 mm.
- an infrared shielding film may be attached to the base provided on the main body (window frame or the like).
- an infrared shielding film may be pasted on a substrate (for example, glass) provided in advance on a window or the like to form a shielding body, and the shielding body may be installed as a building window glass or an automobile glass in the main body.
- the dielectric multilayer film (A) is installed so as to face outdoors, but the infrared shielding film may be indoor or outdoor. From the viewpoint of durability and indoor heat retention, it is better to dispose an infrared shielding film on the indoor side.
- a method for providing the infrared shielding film of the present invention on the substrate a method in which an adhesive layer is coated on the infrared shielding film as described above and then attached to the substrate via the adhesive layer is preferably used.
- a dry pasting method in which a film is pasted on a substrate as it is, and a water pasting method as described above can be applied, but in order to prevent air from entering between the substrate and the infrared shielding film, From the viewpoint of ease of construction, such as positioning of the infrared shielding film on the substrate, it is more preferable to bond by a water bonding method.
- the infrared shielding film be manufactured with as little deflection and warp as possible.
- the ratio of the thickness of the dielectric multilayer film (A) to the dielectric multilayer film (B) is 20% or less. It is preferable that it is 15% or less.
- the dielectric multilayer films (A) and (B) may cause deflection and warping due to different linear expansion coefficients, but if the film thickness ratio is in the above range, the deflection and warping are effective. Can be prevented.
- the infrared shielding body of the present invention may be in a state where the infrared shielding film of the present invention is provided on a plurality of surfaces of the substrate, or in a state where a plurality of substrates are provided on the infrared shielding film of the present invention.
- a laminated glass-like embodiment may be used.
- the dielectric multilayer film (A) that reflects near infrared rays is installed on the outdoor side
- the dielectric multilayer film (B) that reflects middle-far infrared rays is installed on the indoor side.
- the infrared shielding film of the present invention can be applied to a wide range of fields. For example, pasting to windows exposed to sunlight such as outdoor windows of buildings and automobile windows, film for window pasting that gives infrared reflection effect to suppress excessive rise in indoor temperature, film for agricultural greenhouse, etc. As, it is mainly used for the purpose of an agricultural film provided with an infrared shielding effect for suppressing an excessive increase in the temperature in the house.
- the infrared shielding film of the present invention is sandwiched between glasses and used as an infrared shielding film for automobiles.
- the infrared shielding film can be sealed from outside air gas. From the viewpoint of durability, it is preferable.
- the present invention has a glass frame provided with the infrared shielding film of the present invention, and is installed so that the surface on which the dielectric multilayer film (A) is laminated faces the outdoor side. Also provide.
- the present invention provides a window frame that has a glass provided with the infrared shielding film of the present invention and is installed so that the surface on which the dielectric multilayer film (A) is laminated faces the outdoor side. It also provides a way to set up the body.
- Example 1> [Preparation of coating solution for forming low refractive index layer] 15.0 parts by weight of partially saponified polyvinyl alcohol (water-soluble resin JP45 (manufactured by Nippon Vinegar Bipovar, saponification degree 88%, polymerization degree 4500)) was added to 500 parts by weight of pure water with stirring, and then modified. An aqueous solution of a water-soluble resin was obtained by dissolving 2.0 parts by mass of polyvinyl alcohol (water-soluble resin AZF8035 (manufactured by Nippon Synthetic Chemical)) at 70 ° C. while mixing.
- water-soluble resin JP45 manufactured by Nippon Vinegar Bipovar, saponification degree 88%, polymerization degree 4500
- the entire amount of the aqueous water-soluble resin solution obtained above was added and mixed in 350 parts by mass of 10% by mass acidic silica sol (Snowtex OXS: manufactured by Nissan Chemical Co., Ltd.) containing silica fine particles having an average particle diameter of 5 nm. Furthermore, 10 parts by mass of a 4% by mass aqueous solution of boric acid was added and stirred for 1 hour, and then finished to 1000.0 g with pure water to prepare a coating solution L1 for forming a low refractive index layer.
- 10% by mass acidic silica sol Snowtex OXS: manufactured by Nissan Chemical Co., Ltd.
- boric acid 10 parts by mass of a 4% by mass aqueous solution of boric acid was added and stirred for 1 hour, and then finished to 1000.0 g with pure water to prepare a coating solution L1 for forming a low refractive index layer.
- titanium oxide sol volume average particle diameter 5 nm, rutile type titanium oxide particles (manufactured by Sakai Chemical Co., Ltd .: trade name SRD-W)
- SRD-W rutile type titanium oxide particles
- a silica-modified titanium oxide particle dispersion H1 was prepared by mixing 28.9 parts of the silica-attached titanium oxide sol aqueous dispersion having a solid content concentration of 20.0% by weight obtained above with 9.0 parts of a 4% by weight boric acid aqueous solution. Was prepared.
- the refractive indexes of the high refractive index layer and the low refractive index layer manufactured by the above-described method were measured, they were 1.9 and 1.45, respectively.
- Thermoplastic saturated norbornene resin (ZEONEX 280, manufactured by Nippon Zeon Co., Ltd., glass transition temperature of about 140 ° C., number average molecular weight of about 28,000) using a twin screw extrusion kneader (TEM-35B, manufactured by Toshiba Machine Co., Ltd.) having a diameter of 35 mm.
- TEM-35B twin screw extrusion kneader
- 1 part by weight of near infrared absorber SIR-128 manufactured by Mitsui Toatsu Dye Co., Ltd., absorption wavelength region of about 700 to about 1000 nm
- This pellet was molded at a resin temperature of 260 ° C. to form a non-interference layer N1 containing an infrared absorber.
- the separator film As the separator film, a 25 ⁇ m-thick polyester film (therapy: manufactured by Toyo Metallizing Co., Ltd.) was used. On this separator film, the adhesive coating liquid was applied with a wire bar and dried at 80 ° C. for 2 minutes to produce a film with an adhesive layer. The adhesive layer surface of this film was bonded to a predetermined position by a bonding machine. At this time, the tension at the time of bonding on the infrared shielding film side was 10 kg / m, and the tension at the time of bonding of the film with the adhesive layer was 30 kg / m.
- UV curable hard coat material (UV-7600B: manufactured by Nippon Synthetic Chemical Co., Ltd.) is added to 90 parts by mass of methyl ethyl ketone solvent, and then a photopolymerization initiator (Irgacure 184: manufactured by Ciba Specialty Chemicals).
- a coating liquid for forming a hard coat layer was obtained by adding and mixing 5 parts by mass with stirring.
- a hard coat layer coating solution was applied to a predetermined position with a wire bar, and dried with hot air at 70 ° C. for 3 minutes. Thereafter, a hard coat layer was formed by curing under a curing condition: 400 mJ / cm 2 with a UV curing apparatus (using a high-pressure mercury lamp) manufactured by Eye Graphics Co., Ltd. in the atmosphere.
- the dielectric multilayer film (A1) corresponds to the dielectric multilayer film (A) of the present invention
- the dielectric multilayer film (B1) corresponds to the dielectric multilayer film (B) of the present invention.
- the film thickness (excluding the thick film layer) of the low refractive index layer and the high refractive index layer of the dielectric multilayer film (A1) was 147 to 325 nm and 113 to 130 nm, respectively.
- the total film thickness was 2.39 ⁇ m.
- the film thicknesses (excluding the thick film layer) of the low refractive index layer and the high refractive index layer of the dielectric multilayer film (B1) were 90 to 290 nm and 192 to 237 nm, respectively, and the total film thickness was 2.30 ⁇ m. It was.
- the film thicknesses of the high refractive index layer and the low refractive index layer are shown in Table 1.
- Example 2 Using a slide hopper coating apparatus capable of simultaneous multi-layer coating on a 50 ⁇ m thick polyethylene terephthalate (PET) support, while maintaining the temperature at 45 ° C., the above-prepared coating solution for forming a low refractive index layer and high refractive index layer formation The coating solution for coating was simultaneously applied in multiple layers. At this time, the layer structure was a low refractive index layer on the film surface side, and four low refractive index layers and three high refractive index layers were laminated alternately, for a total of seven layers. Immediately after that, after setting the film surface by blowing cold air for 1 minute under the condition that the film surface was 15 ° C. or less, the film was dried by blowing hot air of 80 ° C. to produce a dielectric multilayer film (B2).
- PTT polyethylene terephthalate
- a non-interfering layer N2 is produced by an extruder so that the film thickness after drying a solution in which butyral resin (manufactured by Sekisui Chemical Co., ESREC BM-S) is dissolved in methyl ethyl ketone solution and ATO is dispersed is 10 ⁇ m.
- ESREC BM-S butyral resin
- the film thicknesses of the formed high refractive index layer and low refractive index layer are shown in Table 1, respectively.
- the dielectric multilayer film (A2) corresponds to the dielectric multilayer film (A) of the present invention
- the dielectric multilayer film (B2) corresponds to the dielectric multilayer film (B) of the present invention.
- Example 3 In the formation of the infrared shielding film 1, an infrared shielding film 3 was obtained in the same manner except that the dielectric multilayer film (B2) was used instead of the dielectric multilayer film (B1).
- the non-interference layer N1 does not contain the near infrared absorber SIR-128, and the hard coat layer has an infrared absorber (ATO powder, ultrafine particle ATO, Sumitomo Metal Mining Co., Ltd.) Infrared shielding film 4 was obtained in the same manner except that it was incorporated.
- ATO powder ultrafine particle ATO, Sumitomo Metal Mining Co., Ltd.
- Comparative Example 1 In the formation of the infrared shielding film 1, a hard coat layer is applied on the dielectric multilayer film (A1), and an adhesive layer is applied on the dielectric multilayer film (B1). Comparative film 1 was obtained in the opposite manner.
- ⁇ Comparative Example 2> In the formation of the infrared shielding film 1, a comparative film 2 was obtained in the same manner except that the dielectric multilayer film (B1) was not used, that is, the hard coat layer was directly coated on the non-interference layer N1.
- the non-interference layer N1 is referred to in this way for convenience, but since the dielectric multilayer film (B) is not provided in the comparative example 2, the function as the original non-interference layer is not achieved.
- the layer structure of Comparative Example 2 is shown in FIG.
- Comparative Example 3 In the formation of the infrared shielding film 1, the dielectric multilayer film (B1), the dielectric multilayer film (A1), and the adhesive layer are coated on the non-interference layer N1 in this order, and the hard coat is applied to the opposite side of the non-interference layer N1. Comparative film 3 was obtained in the same manner except that the layers were applied directly. Although the non-interference layer N1 is referred to as such for convenience, in the comparative example 3, since it is not installed between the dielectric multilayer films (A) and (B), interference between the dielectric multilayer films (A) and (B) is prevented. The function is not fulfilled.
- the layer structure of Comparative Example 3 is shown in FIG.
- ⁇ Comparative example 4> In the formation of the infrared shielding film 1, a comparative film 4 was obtained in the same manner except that the dielectric multilayer film (A1) was not provided, that is, the adhesive layer was directly applied to the non-interference layer N1.
- the non-interference layer N1 is referred to in this way for convenience, but since the dielectric multilayer film (A) is not provided in Comparative Example 4, the function as the original non-interference layer is not achieved.
- the layer structure of Comparative Example 4 is shown in FIG.
- ⁇ Comparative Example 5> In the formation of the infrared shielding film 1, the dielectric multilayer film (A1) and the dielectric multilayer film (B1) are not used, and the adhesive layer and the hard coat layer are directly coated on the non-interference layer N1. Similarly, a comparative film 5 was obtained. Although the non-interference layer N1 is referred to in this manner for convenience, the dielectric multilayer films (A) and (B) are not provided in the comparative example 5, and thus the original function as the non-interference layer is not achieved.
- Infrared shielding films each having a dielectric multilayer film A1 formed on one side of PET (Ayoyobo A4300: double-sided easy-adhesion layer) were prepared, and a spectrophotometer (integrated sphere, manufactured by JASCO Corporation, model V-670) was used. The reflectance in the region of 850 to 2500 nm was measured. The film was placed so that light intrusion during the measurement was from the reflective layer side. The results are shown in A in the graph of FIG. A reflection maximum having a reflectance of 94% was exhibited at a wavelength of 950 nm.
- the reflectance of the dielectric multilayer film B1 was measured. The results are shown in B in the graph of FIG. A reflection maximum value of 46% reflectance (49% of the maximum reflectance of the dielectric multilayer film A1) was exhibited at a wavelength of 1300 nm. The wavelength region exceeding the reflectance of 20% was 1000 nm from 1180 nm to 2180 nm.
- the dielectric multilayer film A2 exhibits a reflection maximum value of 84% reflectance at a wavelength of 990 nm
- the dielectric multilayer film B2 exhibits a reflection maximum value of 41% (49% of the maximum reflectance of the dielectric multilayer film A2) at a wavelength of 1750 nm. It was.
- the wavelength region of the dielectric multilayer film B having a reflectance exceeding 20% was 750 nm, which is 1200 nm to 1350 nm and 1500 nm to 2100 nm.
- Total film thickness ratio The cross section of the prepared infrared shielding film was observed with an electron microscope and SEM, and the total film thicknesses of the dielectric multilayer film (A1 or A2) and the dielectric multilayer film (B1 or B2) were obtained, respectively, and this ratio was calculated by the formula (1). Calculated as follows.
- ⁇ Indoor warming effect> An infrared reflective film is attached to the indoor side of the window held by an aluminum sash of 60cm x 60cm, and a far infrared heater as a heating heat source is irradiated from the indoor side for 10 minutes, and 1cm away from the glass by a space thermometer. The indoor and outdoor temperatures were measured. It can be said that the greater the temperature difference, the higher the heat retention effect.
- the obtained infrared shielding film was cut into a size of 60 cm ⁇ 60 cm, wound around a paper core having a diameter of 3 inches, and then stored in a thermostat at 58 ° C. for 3 days in a plastic bag. Then, take it out, roll it up from the paper core on the desk so that the inside of the firewood is up, let it stand for 30 minutes, measure the rising height from the desk surface at the four corners of the film with a ruler, and calculate the average Then, the amount of warping was evaluated according to the following criteria.
- any of the infrared shielding films 1 to 4 of the present invention has a small temperature difference between the glass center and the sash, and the risk of thermal cracking is higher than that of the comparative films 1, 4 and 5 of the comparative example. It was shown to be reduced.
- Comparative Examples 2 and 3 are inferior to the present invention in terms of preventing warpage.
- any of the infrared shielding films 1 to 4 of the present invention has a large temperature difference between the indoor side and the outdoor side. It was shown that the effect is excellent.
- both of the infrared shielding films 1 and 2 when the ratio of the total film thickness of the dielectric multilayer film (A) and the dielectric multilayer film (B) is within ⁇ 20% There was little curvature and it showed that there was little curvature than the comparative films 2, 3, and 4 of a comparative example, and it was shown that it is excellent in the construction property to glass. Moreover, since there is little curvature, the risk of film peeling is also reduced.
- Dielectric multilayer film A
- 2 Dielectric multilayer film B
- 3 non-interference layer 4
- functional layer adheresive layer
- 5 functional layer hard coat layer
- 6 Window glass 7 Non-interference layer N1.
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Abstract
Description
本発明の赤外遮蔽フィルムは、赤外線を反射する機能と吸収する機能を必須として有している。本発明の赤外遮蔽フィルムは、誘電多層膜(A)と、誘電多層膜(B)と、当該誘電多層膜(A)および誘電多層膜(B)の間に配置される非干渉層と、赤外吸収剤と、を必須成分として含むものであればよく、また必要により各種の機能性層をさらに含んでもよい。たとえば、本発明に係る誘電多層膜(A)または誘電多層膜(B)の少なくとも1方の外側に機能性層を有することが好ましい。機能性層の具体例については後述するが、本発明のフィルムが窓ガラス等に設置して使用するのに好適であるため、窓ガラスとフィルムとを固定する粘着剤層等があり得る。また、赤外吸収剤は、誘電多層膜(A)および誘電多層膜(B)以外のいずれか1層に含まれる。したがって、機能性層を設けた場合にそのいずれかが赤外吸収剤を含んでもよい。
本発明において、誘電多層膜とは、低屈折率材料を有する層(低屈折率層とも称する)と、高屈折率材料を有する層(高屈折率層とも称する)とを交互に積層してなる赤外遮蔽層のことをいう。
本発明に係る誘電多層膜(A)において、用いられる高屈折率層の1層あたりの厚さは、50~1220nmであることが好ましく、70~1220nmであることがより好ましい。用いられる低屈折率層の1層あたりの厚さは、70~1350nmであることが好ましく、90~1330nmであることがより好ましい。
本発明に係る誘電多層膜(B)において、用いられる高屈折率層の1層あたりの厚さは、70~1300nmであることが好ましく、90~1250nmであることがより好ましい。用いられる低屈折率層の1層あたりの厚さは、80~1320nmであることが好ましく、90~1300nmであることがより好ましい。
本発明に係る誘電多層膜(A)または誘電多層膜(B)に使用できる金属酸化物として、特に制限されないが、透明な誘電体材料であることが好ましい。例えば、酸化チタン、酸化ジルコニウム、酸化亜鉛、合成非晶質シリカ、コロイダルシリカ、アルミナ、コロイダルアルミナ、チタン酸鉛、鉛丹、黄鉛、亜鉛黄、酸化クロム、酸化第二鉄、鉄黒、酸化銅、酸化マグネシウム、水酸化マグネシウム、チタン酸ストロンチウム、酸化イットリウム、酸化ニオブ、酸化ユーロピウム、酸化ランタン、ジルコン、酸化スズ等を挙げることができ、低屈折率層、高屈折率層いずれも屈折率を調整するために適宜併用しても構わない。
本発明に係る誘電多層膜を構成する高屈折率層または低屈折率層には、上述した金属酸化物粒子と組み合わせて使用する水溶性高分子が含まれてもよい。本発明に係る高屈折率層と低屈折率層とで共通の水溶性高分子を使用してもよい。
本発明に係るゼラチンとしては、酸処理ゼラチン、アルカリ処理ゼラチンの他に、ゼラチンの製造過程で酵素処理をする酵素処理ゼラチン及びゼラチン誘導体、すなわち分子中に官能基としてのアミノ基、イミノ基、ヒドロキシル基、カルボキシル基を持ち、それと反応して得る基を持った試薬で処理し改質したものでもよい。
本発明に適用可能な合成ポリマーとしては、例えば、ポリビニルアルコール類、ポリビニルピロリドン類、アルキレンオキサイド類、ポリアクリル酸、アクリル酸-アクリルニトリル共重合体、アクリル酸カリウム-アクリルニトリル共重合体、酢酸ビニル-アクリル酸エステル共重合体、若しくはアクリル酸-アクリル酸エステル共重合体などのアクリル系樹脂、スチレン-アクリル酸共重合体、スチレン-メタクリル酸共重合体、スチレン-メタクリル酸-アクリル酸エステル共重合体、スチレン-α-メチルスチレン-アクリル酸共重合体、若しくはスチレン-α-メチルスチレン-アクリル酸-アクリル酸エステル共重合体などのスチレンアクリル酸樹脂、スチレン-スチレンスルホン酸ナトリウム共重合体、スチレン-2-ヒドロキシエチルアクリレート共重合体、スチレン-2-ヒドロキシエチルアクリレート-スチレンスルホン酸カリウム共重合体、スチレン-マレイン酸共重合体、スチレン-無水マレイン酸共重合体、ビニルナフタレン-アクリル酸共重合体、ビニルナフタレン-マレイン酸共重合体、酢酸ビニル-マレイン酸エステル共重合体、酢酸ビニル-クロトン酸共重合体、酢酸ビニル-アクリル酸共重合体などの酢酸ビニル系共重合体及びそれらの塩が挙げられる。これらの中で、特に好ましい例としては、ポリビニルアルコール類及びそれを含有する共重合体が挙げられる。
本発明に係る高屈折率層および低屈折率層には適用可能な各種の添加剤を以下に例挙する。
本発明において、バインダーである水溶性高分子を硬化されるために、硬化剤を使用することが好ましい。
本発明に係る高屈折層および低屈折率層の少なくとも1層に、界面活性剤を添加しても良い。活性剤種としてはアニオン系、カチオン系、ノニオン系のいずれの種類も使用することができる。特にアセチレングリコール系ノニオン性界面活性剤、4級アンモニウム塩系カチオン性界面活性剤及びフッ素系カチオン性界面活性剤が好ましい。
本発明に係る非干渉層においては、本発明に係る誘電多層膜(A)と当該非干渉層との間に任意の層を積層してもよく、また本発明に係る誘電多層膜(B)と当該非干渉層との間にも任意の層を積層してもよいが、誘電多層膜(A)および誘電多層膜(B)から生じる光学的な特性を互いに干渉しないように、誘電多層膜(A)と誘電多層膜(B)との間に、本発明に係る非干渉層を配置することが必須である。
本発明において、前記誘電多層膜(A)または前記誘電多層膜(B)の少なくとも1方の外側に機能性層を有することが好ましい。
〔粘着層〕
本発明の赤外遮蔽フィルムのいずれかの最表層面に粘着層を設けることが出来る。
本発明に係るハードコート層は、本発明の赤外遮蔽フィルムの両面に積層してもよく、片面に積層してもよい。
本発明の赤外遮蔽フィルムにおいては、本発明に係る誘電多層膜(A)および誘電多層膜(B)以外のいずれか1層に赤外吸収剤を含む。
本発明の赤外遮蔽フィルムの製造方法について特に制限はなく、非干渉層の両面に高屈折率層と低屈折率層とを交互に積層してなる誘電多層膜(A)および高屈折率層と低屈折率層とを交互に積層してなる誘電多層膜(B)がそれぞれ形成することができるのであれば、いかなる方法でも用いられる。
本発明の赤外遮蔽体とは、本発明の赤外遮蔽フィルムを基体の少なくとも一方の面に設けられた態様を表す。
本発明の赤外遮蔽フィルムは、幅広い分野に応用することができる。例えば、建物の屋外の窓や自動車窓等太陽光に晒らされる窓ガラスに貼り合せ、室内温度の過上昇を抑える赤外反射効果を付与する窓貼用フィルム、農業用ビニールハウス用フィルム等として、主としてハウス内温度の過上昇を抑える赤外遮蔽効果を付与した農業用フィルムの目的で用いられる。
〔低屈折率層形成用塗布液の調製〕
500質量部の純水に、部分ケン化ポリビニルアルコール(水溶性樹脂JP45(日本酢ビポバール社製、ケン化度88%、重合度4500))15.0質量部を攪拌しながら添加し、次いで変性ポリビニルアルコール(水溶性樹脂AZF8035(日本合成化学社製))2.0質量部を混合しながら70℃に昇温溶解させることにより、水溶性樹脂の水溶液を得た。
[二酸化チタンゾル水系分散液の調製]
まず、ケイ酸ソーダ4号(日本化学社製)をSiO2に換算した時の濃度が2.0質量%であるように純水で希釈し、ケイ酸水溶液を調製した。
直径35mmの二軸押出混練機(TEM-35B、東芝機械社製)で熱可塑性飽和ノルボルネン系樹脂(ZEONEX 280、日本ゼオン株式会社製、ガラス転移温度約140℃、数平均分子量約28,000)100重量部に近赤外線吸収剤SIR-128(三井東圧染料株式会社製、吸収波長領域約700~約1000nm)1重量部を添加し、樹脂温度220℃で混練し、ペレタイザーでペレット化した。このペレットを、樹脂温度260℃で成形し、赤外吸収剤を含有する非干渉層N1を形成した。
酢酸エチル60質量部およびトルエン20質量部を混合し、さらにアクリル系粘着剤(アロンタックM-300、東亞合成社製)20質量部を攪拌しながら添加し、混合することにより粘着剤塗布液を得た。
メチルエチルケトン溶媒90質量部にUV硬化型ハードコート材(UV-7600B:日本合成化学社製)7.5質量部を添加し、次いで光重合開始剤(イルガキュア184:チバ・スペシャリティ・ケミカルズ製)0.5質量部を攪拌しながら添加し混合することによりハードコート層形成用塗布液を得た。
上記製造した赤外吸収剤を含有する非干渉層N1の上に、多層同時塗布可能なスライドホッパー塗布装置を用い、45℃に保温しながら、上記調製した低屈折率層形成用塗布液及び高屈折率層形成用塗布液を同時重層塗布した。この際、層の構成は、フィルム表面側に低屈折率層とし、それぞれ交互に低屈折率層は7層、高屈折率層は6層、計13層を積層した。その直後、膜面が15℃以下となる条件で冷風を1分間吹き付けてセットさせた後、80℃の温風を吹き付けて乾燥させ、誘電多層膜(A1)を作製した。
厚さ50μmのポリエチレンテレフタレート(PET)支持体上に、多層同時塗布可能なスライドホッパー塗布装置を用い、45℃に保温しながら、上記調製した低屈折率層形成用塗布液及び高屈折率層形成用塗布液を同時重層塗布した。この際、層の構成は、フィルム表面側に低屈折率層とし、それぞれ交互に低屈折率層は4層、高屈折率層は3層、計7層を積層した。その直後、膜面が15℃以下となる条件で冷風を1分間吹き付けてセットさせた後、80℃の温風を吹き付けて乾燥させ、誘電多層膜(B2)を作製した。
上記赤外遮蔽フィルム1の形成において、誘電多層膜(B1)の代わりに誘電多層膜(B2)を用いること以外は同様にして、赤外遮蔽フィルム3を得た。
上記赤外遮蔽フィルム4の形成において、非干渉層N1の中に近赤外線吸収剤SIR-128を含有させないこと、およびハードコート層に赤外吸収剤(ATO粉末、超微粒子ATO、住友金属鉱山株式会社製)を含有させること以外は同様にして、赤外遮蔽フィルム4を得た。
上記赤外遮蔽フィルム1の形成において、誘電多層膜(A1)の上にハードコート層、誘電多層膜(B1)の上に粘着層を塗工し、本発明の赤外遮蔽フィルム1の設置方向とは逆になるような比較フィルム1を得た。
上記赤外遮蔽フィルム1の形成において、誘電多層膜(B1)を用いず、すなわち、ハードコート層を非干渉層N1上に直接塗工すること以外は同様にして、比較フィルム2を得た。非干渉層N1は便宜上このように称するが、比較例2では誘電多層膜(B)を設けていないため、本来の非干渉層としての機能は果たしていない。比較例2の層構成は図4に示す。
上記赤外遮蔽フィルム1の形成において、非干渉層N1に上に誘電多層膜(B1)、誘電多層膜(A1)、および粘着層の順に塗工し、非干渉層N1の反対側にハードコート層を直接塗工すること以外は同様にして、比較フィルム3を得た。非干渉層N1は便宜上このように称するが、比較例3では誘電多層膜(A)および(B)の間に設置されていないため、誘電多層膜(A)および(B)の干渉を防止する機能は果たしていない。比較例3の層構成は図6に示す。
上記赤外遮蔽フィルム1の形成において、誘電多層膜(A1)を設けず、すなわち、粘着層を非干渉層N1に直接塗工すること以外は同様にして、比較フィルム4を得た。非干渉層N1は便宜上このように称するが、比較例4では誘電多層膜(A)を設けていないため、本来の非干渉層としての機能は果たしていない。比較例4の層構成は図5に示す。
上記赤外遮蔽フィルム1の形成において、誘電多層膜(A1)および誘電多層膜(B1)を共に使用せず、粘着層をおよびハードコート層は非干渉層N1上に直接塗工すること以外は同様にして、比較フィルム5を得た。非干渉層N1は便宜上このように称するが、比較例5では誘電多層膜(A)および(B)を設けていないため、本来の非干渉層としての機能は果たしていない。
誘電多層膜A1をPET(東洋紡製A4300:両面易接着層)の片面に形成した赤外遮蔽フィルムをそれぞれ作製し、分光光度計(積分球使用、日本分光社製、V-670型)を用い、850~2500nmの領域における反射率を測定した。測定時光の侵入は反射層側からになるようにして、フィルムを設置した。その結果を図7のグラフ中Aに示す。波長950nmに反射率94%の反射極大値を示した。
作製した赤外遮蔽フィルムの断面を電子顕微鏡およびSEMで観察し、誘電多層膜(A1またはA2)および誘電多層膜(B1またはB2)の総膜厚をそれぞれ求め、この比を数式(1)の通りに算出した。
60cm×60cmのアルミサッシで保持された窓の屋内側の面に赤外反射フィルムを貼りつけ、屋外側から太陽に見立てた白熱灯を10分間照射し、接触式温度計によりガラス中央部とサッシ付近の温度を測定した。この温度差が小さいほど、熱割れのリスクが低いと言える。
60cm×60cmのアルミサッシで保持された窓の屋内側の面に赤外反射フィルムを貼りつけ、屋内側から暖房熱源となる遠赤外線ヒーターを10分間照射し、空間温度計によりガラスからそれぞれ1cm離れた屋内側、屋外側の温度を測定した。この温度差が大きいほど、保温効果が高いと言える。
得られた赤外遮蔽フィルムを60cm×60cmの大きさに切り出し、径が3インチの紙コアに巻き取った後、ビニール袋に入れた状態で、58℃の恒温槽に3日間、保管した。その後、取り出し、机の上で、まき内側が上になるように紙コアから巻きだし、30分放置した後、フィルムの四隅の机表面からの立ちあがり高さを定規で測定し、その平均を計算して反りあがり量を以下の基準で評価した。
○ :反りあがり量が3mm以下
○△:反りあがり量が3mm超~7mm以下
△ :反りあがり量が7mm超~15mm以下
△×:反りあがり量が15mm超~30mm以下
× :反りあがり量が30mm超。
2 誘電多層膜(B)、
3 非干渉層、
4 機能性層(粘着層)、
5 機能性層(ハードコート層)、
6 窓ガラス、
7 非干渉層N1。
Claims (8)
- 誘電多層膜(A)、誘電多層膜(B)、および前記誘電多層膜(A)と前記誘電多層膜(B)との間に配置される非干渉層を有し、
前記誘電多層膜(A)が、900~1100nmの波長領域に反射率が50%以上の反射極大値を持ち、前記誘電多層膜(B)が、1200~2100nmの波長領域に反射極大値を持ち、
前記誘電多層膜(A)および前記誘電多層膜(B)以外のいずれか1層に赤外吸収剤を含有し、
前記誘電多層膜(A)が積層されている面を屋外側に向けるように設置する、赤外遮蔽フィルム。 - 前記誘電多層膜(B)の1200~2100nmの波長領域における反射率が、前記誘電多層膜(A)の900~1100nmの波長領域における最大反射率の20~50%である、請求項1に記載の赤外遮蔽フィルム。
- 前記誘電多層膜(A)または前記誘電多層膜(B)の少なくとも1方の外側に機能性層を有する、請求項1または2に記載の赤外遮蔽フィルム。
- 前記赤外吸収剤が、前記誘電多層膜(A)と前記誘電多層膜(B)との間の層に含有される、請求項1~3のいずれか1項に記載の赤外遮蔽フィルム。
- 前記誘電多層膜(A)と前記誘電多層膜(B)の総膜厚の比が、±20%以内である、請求項1~4のいずれか1項に記載の赤外遮蔽フィルム。
- 前記誘電多層膜(A)が積層されている面を屋外側に向けるように設置し、かつ屋内に貼られる、請求項1~5のいずれか1項に記載の赤外遮蔽フィルム。
- 請求項1~6のいずれか1項に記載の赤外遮蔽フィルムを設けたガラスを有し、
前記誘電多層膜(A)が積層されている面が屋外側に向けるように設置される、窓枠体。 - 請求項1~6のいずれか1項に記載の赤外遮蔽フィルムを設けたガラスを有する窓枠体を前記誘電多層膜(A)が積層されている面が屋外側に向くように設置する、窓枠体の設置方法。
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Also Published As
Publication number | Publication date |
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JP6112112B2 (ja) | 2017-04-12 |
CN104428698A (zh) | 2015-03-18 |
US20150192718A1 (en) | 2015-07-09 |
JPWO2014010532A1 (ja) | 2016-06-23 |
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