TW202014300A - Infrared ray-reflecting film - Google Patents

Abstract

The present application relates to an infrared ray-reflecting film, and provides an infrared ray-reflecting film comprising an overcoating layer having excellent contamination resistance and scratch resistance as well as having a thickness of a thin film.

Description

Infrared reflective film

This application is about an infrared reflective film. [Cross-reference of related applications]

This application claims the priority right of Korean Patent Application No. 10-2018-0087745 filed on July 27, 2018, and the disclosure content of the application is incorporated herein by reference in its entirety.

According to the infrared blocking method, among the window films, the solar control film can be classified into an absorptive film and a reflective film. Among these films, reflective solar control films are usually formed in a structure in which metal oxide layers and metal layers are alternately stacked, and in addition to the inherent infrared blocking function of the film, in order to obtain hardness improvement and pollution control, the separation layer is also Included in the upper part and the lower part of alternately stacked layers.

For example, the window film is used by attaching the window film to the glass for the intended use, so there is always a risk of damage caused by external stimuli during glass installation and use, and to reduce such damage to At the very least, an outer coating with excellent anti-pollution function and scratch resistance is required. In order to effectively protect the infrared reflective layer from external factors, it is advantageous that the outer coating is thicker, but when the outer coating is too thick, there is a problem of reduced optical characteristics (such as a rainbow in appearance), and insulation is reduced. Therefore, when the overcoat layer has a thin thickness, research has been conducted to ensure its function, but when the ultraviolet curing material present in the overcoat layer is subjected to ultraviolet curing, the degree of curing is reduced due to O ₂ suppression, so it is not easy Manufacture coatings with excellent scratch resistance.

technical problem

The present application provides an outer coating layer having excellent stain resistance and scratch resistance, and an infrared reflective film having a film thickness. Technical solution

This application is about an infrared reflective film. The infrared reflective film may be a window film attached to glass. Therefore, the present application can provide windows and doors to which infrared reflecting films are attached. The infrared reflective film may be, for example, a film that is transparent to visible light but performs a function of reflecting or blocking infrared rays.

In the present application, visible light may mean, for example, light in the wavelength range of 380 nm to 780 nm, and more specifically, light having a wavelength of 550 nm unless otherwise specified. In addition, in the present application, infrared light may mean light having a wavelength longer than that of visible light, and may be used, for example, to cover near infrared rays in the wavelength range of 780 nm to 2,500 nm and wavelengths in the wavelength range of 2.5 μm to 25 μm. Far infrared. The infrared film of the present application having the following structure can block both near infrared rays and far infrared rays.

In addition, in the present application, the term "upper" or "upper" used in conjunction with the inner layer stacking position means not only the case when the structure is directly formed on another structure, but also when the third structure is inserted in The situation between these structures.

An exemplary infrared reflective film includes: a base layer; an infrared reflective layer disposed on the base layer; and an overcoat layer disposed on the infrared reflective layer and within a thickness range of 100 nm or less. The outer coating layer may include: a monomer or a polymer component; and a thiol compound. In the present application, the outer coating layer present on the infrared reflective layer may have 100 nm or less, 100 nm to 95 nm, 15 nm to 70 nm, 20 nm to 65 nm Or a film with a thickness of 28 nm to 48 nm. The present application can provide an infrared reflective film having excellent optical properties by manufacturing an outer coating into a thin film having a thickness within the above range. In general, when the thickness of the overcoat layer is increased, it has excellent scratch resistance; but in this case, the optical characteristics of the film are reduced, such as the appearance of rainbow. Therefore, through an outer coating layer having a dedicated composition, the present application can provide an infrared reflective film having excellent stain resistance and scratch resistance, and having excellent optical properties.

When it has translucency, the types of materials that can be used for the base material layer are not particularly limited. For example, a glass or resin film having a transmittance of 70% or more to visible light can be used for the base layer. In one example, a polyester-based resin such as polyethylene terephthalate resin, polyethylene naphthalate resin, or polybutylene terephthalate may be used as the resin film Resins, acetate resins, polyether resins, polycarbonate resins, polyimide resins, polyolefin resins, (meth)acrylate resins, polyvinyl chloride resins, polystyrenes Resin, polyvinyl alcohol resin, polyarylate resin or polyphenylene sulfide resin.

Although not specifically limited, the thickness of the base layer may be, for example, 5 μm or more, 5 μm, 10 μm or more, 10 μm, 20 μm or more than 20 μm or 30 μm or more than 30 μm, and the upper limit of the thickness may be 200 μm or 150 microns.

In one example, the infrared reflective layer may include a metal layer and a metal oxide layer. The separation layer may be disposed between the metal oxide layer and the metal layer, and one side of the metal oxide layer and one side of the metal layer may also directly contact each other.

The metal layer may mean a layer containing a metal component as a main component. More specifically, the metal layer may include titanium (Ti), silver (Ag), platinum (Pt), gold (Au), copper (Cu), chromium (Cr), aluminum (Al), palladium (Pd) And one or more metal components of nickel (Ni). With respect to the components of the metal layer, the "main component" may mean that the metal content (which is the main component) in the total content of metals contained in the metal layer is about 80% to 100% by weight or less than 100 The situation at weight %. Therefore, when two or more metal components are included in the metal layer, the content of the remaining metals other than the main component metal, which excludes the content of the main component having the above range, may be included. When metal components other than the metals listed above (such as tin (Sn)) are included, the durability of the film may be deteriorated, such as not only the optical properties of the film are reduced, but also the thermal shielding or thermal insulation ability is reduced or the salt water resistance Also reduced.

The method of forming the metal layer is not particularly limited, and for example, a conventional deposition method or a wet coating method can be used. The process conditions at the time of deposition are not particularly limited, and the metal layer can be provided by a person having ordinary knowledge in the art to select appropriate conditions.

In the present application, the metal oxide layer may mean a layer containing metal oxide as a main component, which may be composed of at least one layer or at least two layers. For example, the metal oxide layer may include oxides of at least one metal selected from the group consisting of niobium (Nb), antimony (Sb), barium (Ba), gallium (Ga), and germanium ( Ge), hafnium (Hf), indium (In), lanthanum (La), magnesium (Mg), selenium (Se), silicon (Si), tantalum (Ta), titanium (Ti), vanadium (V), yttrium ( Y), zinc (Zn) and tin (Sn). In one example, the metal oxide layer may be a pure metal oxide layer composed only of a metal oxide, or may have a ratio of 80% to 100% by weight layer.

Although not specifically limited, in this application, the thickness of the metal layer may be in the range of 1 nm to 50 nm, and the thickness of the metal oxide layer may be in the range of 5 nm to 300 nm. It is possible to ensure proper transmittance and refractive index within the thickness range.

The method of forming the metal oxide layer is not particularly limited, and for example, a conventional deposition method can be used. The process conditions at the time of deposition are not particularly limited, and the metal oxide layer can be provided by those skilled in the art to select appropriate conditions.

The outer coating layer coated on the infrared reflective layer may include: a monomer or a polymer component; and a thiol compound. In the present invention, the term "polymer" is a general term for a compound in a form in which two or more monomers are polymerized, which means, for example, to also include a component commonly referred to as an oligomer. The overcoat layer may include a monomer or polymer component in a cured state, which is described below.

The outer coating layer may be composed of, for example, a photocurable composition. Here, the term "photocurable composition" means a composition in which the curing process is induced by light irradiation (ie, irradiation of electromagnetic waves). Here, the electromagnetic wave used generally refers to microwave, infrared ray (IR), ultraviolet ray (UV), X-ray, γ-ray, or particle beam, such as α particle beam, proton beam, neutron beam, and electron beam.

When the outer coating layer is composed of a photocurable type, the monomer or polymer component may include a photocurable oligomer. Here, examples of the photocurable oligomer may include all oligomer components used for manufacturing a photocurable composition such as a UV-curable type in the related art. For example, the oligomer may include: urethane acrylate obtained by reacting a polyisocyanate having two or more isocyanate groups in the molecule with a hydroxyalkyl (meth)acrylate; by An ester acrylate obtained by the dehydration condensation reaction of a polyester polyol and (meth)acrylic acid; an ester acrylate carbamate, in which an ester carbamate obtained by reacting a polyester polyol with a polyisocyanate Ester resin reacts with hydroxyalkyl acrylate; ether acrylate, such as polyalkylene glycol di(meth)acrylate; ether acrylate urethane, in which polyether polyol reacts with polyisocyanate The ether urethane resin obtained is reacted with hydroxyalkyl (meth)acrylate; or epoxy acrylate obtained by addition reaction of epoxy resin and (meth)acrylic acid, and the like, but Not limited to this.

As the monomer component included with the oligomer, any monomer having a reactive functional group (such as a (meth)acryloyl group) in the molecular structure can be used without specific limitation. This monomer may comprise: alkyl (meth)acrylate; hydroxyl-containing monomers such as hydroxyethyl (meth)acrylate, hydroxypropyl (meth)acrylate or hydroxybutyl (meth)acrylate; containing carboxyl groups Monomers, such as (meth)acrylic acid or β-(meth)acrylic acid carboxyethyl; alkoxy-containing monomers, such as 2-(2-ethoxyethoxy)ethyl (meth)acrylate ; Monomers containing aromatic groups, such as benzyl (meth)acrylate or phenoxyethyl (meth)acrylate; monomers containing heterocyclic residues, such as tetrahydrofuran (meth)acrylate or (meth) Group) Acryloylmorpholine; or multifunctional acrylate, and the like, but not limited thereto. Here, the kind of alkyl (meth)acrylate is not particularly limited, and for example, alkyl (meth)acrylate having a linear or branched alkyl group having 1 to 14 carbon atoms can be used. Examples of this monomer may include methyl (meth)acrylate, ethyl (meth)acrylate, n-propyl (meth)acrylate, isopropyl (meth)acrylate, n-butyl (meth)acrylate, Third butyl (meth)acrylate, second butyl (meth)acrylate, pentyl (meth)acrylate, hexyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, (A Group) 2-ethylbutyl acrylate, n-octyl (meth)acrylate, isooctyl (meth)acrylate, isononyl (meth)acrylate, lauryl (meth)acrylate and (meth)acrylic acid Myristyl ester, and the like, and one or a mixture of two or more of the foregoing may be used.

Here, the specific kind and blending ratio of the monomer or polymer component and the like are not particularly limited, and they may be appropriately selected in consideration of physical properties to be implemented after curing of the desired composition or the like.

Here, the monomer or polymer component contained in the overcoat layer may be of a type including the photocurable oligomer and monomer component as described above. Here, the monomer or polymer component may include a monomer mixture of phosphoric acid (meth)acrylate or fluorine (meth)acrylate.

The monomer or polymer component may include 50 parts by weight to 99.9 parts by weight of photocurable oligomer and 0.1 parts by weight to 10 parts by weight of phosphoric acid (meth)acrylate, and may preferably include 60 parts by weight to 95 parts by weight of photocurable oligomer and 0.5 to 4 parts by weight of phosphoric acid (meth)acrylate. The weight ratio of phosphoric acid (meth)acrylate in the monomer mixture can be adjusted in consideration of the adhesion to the infrared reflective layer and the long-term reliability of the film and the like. The phosphoric acid (meth)acrylate may be a (meth)acrylate compound containing at least one or more phosphoric acid groups, which may include, for example, phosphate (meth)acrylate. In this specification, unless otherwise specified, the unit "parts by weight" means the weight ratio.

In addition, the monomer or polymer component may include 50 parts by weight to 99.9 parts by weight of the photocurable oligomer and 1 part by weight to 50 parts by weight of the fluorine-based (meth)acrylate, and may preferably include 60 parts by weight Parts to 95 parts by weight of photocurable oligomer and 5 parts by weight to 25 parts by weight of fluorine-based (meth)acrylate. By adjusting the content ratio, the present application can effectively prevent the pollution of the infrared reflective film. The fluorine-based (meth)acrylate may be a perfluoro compound, such as, for example, perfluoropolyether acrylate.

In addition, the monomer or polymer component may include 50 parts by weight to 99.9 parts by weight of the photocurable oligomer and 1 part by weight to 30 parts by weight of the thiol compound, and may preferably include 60 parts by weight to 95 parts by weight Parts of photocurable oligomer and 13 parts by weight to 28 parts by weight of thiol compound. By adjusting the content ratio, the present application can reduce O ₂ suppression during UV curing of the overcoat layer to improve scratch resistance and pencil hardness regardless of the thickness of the film.

For example, the thiol compound of the present application may undergo a chain transfer reaction through a thiol-ene reaction together with a monomer or polymer component during ultraviolet irradiation. For example, the monomer or polymer component may be an acrylic compound and may be a multifunctional acrylate, but is not limited thereto. The thiol compound is combined with the monomer mixture of the present application to achieve excellent scratch resistance and pencil hardness. The thiol-based compound may be, for example, a multifunctional primary thiol compound or a multifunctional secondary thiol compound, but is not limited thereto. In one example, the primary thiol compound has excellent reactivity, and the secondary thiol has excellent coating liquid stability. In one example, the thiol compound may include pentaerythritol (3-mercaptobutyl ester).

In the present application, the content range of each monomer or polymer component is not limited thereto, and it may be included as follows when the photocurable oligomer is 100 parts by weight. In one example, based on 100 parts by weight of the photocurable oligomer, 0.1 to 5 parts by weight, 0.5 to 4 parts by weight, 0.8 to 3 parts by weight, 1 to 2 parts by weight, Phosphoric acid (meth)acrylate is contained in an amount of 1.2 parts by weight to 1.8 parts by weight or 1.3 parts by weight to 1.5 parts by weight. In addition, based on 100 parts by weight of the photocurable oligomer, 5 to 30 parts by weight, 8 to 28 parts by weight, 10 to 23 parts by weight, 12 to 18 parts by weight, or 13 parts by weight may be used The amount to 15 parts by weight contains fluorine-based (meth)acrylate. In addition, based on 100 parts by weight of the photocurable oligomer, 10 to 50 parts by weight, 13 to 47 parts by weight, 17 to 43 parts by weight, 22 to 38 parts by weight, or 25 parts by weight The thiol compound is contained in the range of 1 part to 32 parts by weight.

In one example, if desired, the monomer or polymer component may include a multifunctional acrylate and the above-mentioned components. As the type of multifunctional acrylate, for example, bifunctional acrylates such as 1,4-butanediol di(meth)acrylate, 1,6-hexanediol di(meth)acrylate, neopentyl can be used Glycol di(meth)acrylate, polyethylene glycol di(meth)acrylate, neopentyl glycol adipate di(meth)acrylate, hydroxypivalate neopentyl glycol di(meth) ) Acrylate, dicyclopentyl di(meth)acrylate, dicyclopentenyl di(meth)acrylate modified with caprolactone, di(meth)acrylate modified with ethylene oxide, Di(meth)acryloyl isocyanurate, allylated di(meth)acrylate cyclohexyl, tricyclodecane dimethanol (meth)acrylate, dimethylol dicyclopentane Di(meth)acrylate, hexahydrophthalic acid di(meth)acrylate modified with ethylene oxide, tricyclodecane dimethanol (meth)acrylate, modified with neopentyl glycol Trimethylpropanedi(meth)acrylate, adamantane di(meth)acrylate or 9,9-bis[4-(2-propenyloxyethoxy)phenyl]fluoro; trifunctional acrylic Esters, such as trimethylolpropane tri(meth)acrylate, dipentaerythritol tri(meth)acrylate, propionic acid modified dipentaerythritol tri(meth)acrylate, pentaerythritol tri(meth)acrylate 3. Trimethylolpropane tri(meth)acrylate modified with propylene oxide, trifunctional urethane (meth)acrylate or tri(meth)acryloyl oxyethyl isocyanurate; Tetrafunctional acrylates, such as diglycerol tetra(meth)acrylate or pentaerythritol tetra(meth)acrylate; pentafunctional acrylates, such as dipentaerythritol penta(meth)acrylate modified with propionic acid; and hexafunctional Acrylic esters, such as dipentaerythritol hexa(meth)acrylate, dipentaerythritol hexa(meth)acrylate modified with caprolactone or carbamate (meth)acrylate (for example, isocyanate monomer and trimethacrylate) (Reactant of methylolpropane tri(meth)acrylate) and the like are not limited thereto.

The polyfunctional acrylate may be contained in an amount of 0.05 to 50 parts by weight or 5 to 30 parts by weight based on 100 parts by weight of the photocurable oligomer.

The overcoat layer may further include a photoinitiator, where the degree of polymerization can be controlled according to the amount of components used. As the photoinitiator, any photoinitiator can be used as long as it can initiate a polymerization reaction via light irradiation or the like. For example, it may include: Alpha hydroxy ketone compounds (such as IRGACURE 184, IRON REINFORCEMENT 500, IRON REINFORCEMENT 2959, DAROCUR 1173; manufactured by Ciba Specialty Chemicals); Phenylglyoxalic acid compounds (such as Yanjian 754, Dekang MBF; manufactured by Ciba Refining); benzyl dimethyl ketal compounds (such as Yanjian 651; manufactured by Ciba); a-amine Ketone-based compounds (such as Yanjian 369, Yanjian 907, Yanjian 1300, manufactured by Ciba Refining); monoacylphosphine-based compounds (MAPO) (such as Deqiang TPO; by Ciba Chemical manufacturing); bisacylphosphine-based compound (BAPO) (such as Yanjian 819, Yanjian 819DW; manufactured by Ciba Refining); phosphine oxides (such as Yanjian 2100; made by Ciba Chemical manufacturing); metallocene compounds (such as Yanjian 784; manufactured by Ciba Refining); iodine salts (such as Yanjian 250; manufactured by Ciba); and mixtures of one or more of them (such as Dejian 4265, Yanjian 2022, Yanjian 1300, Yanjian 2005, Yanjian 2010, Yanjian 2020; manufactured by Ciba Refinery), and the like, and one or two or more of the foregoing can be used, not Limited to this.

The photoinitiator may be included in an amount of 0.05 to 20 parts by weight or 1 to 9 parts by weight based on 100 parts by weight of the photocurable oligomer.

In the embodiment of the present application, the outer coating layer may further include an inorganic filler. In this application, the specific types of fillers that can be used are not particularly limited, and for example, one or two or more of clay, talc, alumina, calcium carbonate, zirconia or silica, and the like can be used A mixture of the two.

The inorganic filler of the present application may be included in an amount of 1 part by weight to 70 parts by weight or 25 parts by weight to 50 parts by weight based on 100 parts by weight of the solid content in the outer coating layer. In addition, the inorganic filler may have an average particle diameter in the range of 5 nm to 100 nm or 8 nm to 40 nm as measured by the D50 particle size analyzer. In addition, the inorganic filler may have a refractive index in the range of 1.2 to 2.0 or 1.4 to 1.7. Since the outer coating of the present application includes an inorganic filler, it is possible to produce a cured product with desired physical properties.

In one example, the present application may further include a hard coat layer disposed between the base layer and the infrared reflective layer. The hard coat layer is a cured layer of the resin composition, which may be a layer having transparency. For example, the hard coat layer may be a layer obtained by curing a composition having a (meth)acrylate monomer or its polymer or a composition having an epoxy resin. The composition may further include inorganic fillers, such as silica, zirconia, or alumina. The inorganic filler may have a particle diameter in the range of 0.01 micrometer to 1 micrometer or 0.1 micrometer to 0.5 micrometer, and may be included as an inorganic filler having a single diameter, or two or more inorganic fillers having different diameters may be mixed Agent. The specific composition of the hard coat layer may be the same as or different from the composition of the overcoat layer as described above. The thickness of the hard coat layer may be in the range of 0.5 to 10 microns, and the refractive index may be in the range of 1.4 to 1.7. Favorable effect

The present application provides an outer coating layer having excellent stain resistance and scratch resistance, and an infrared reflective film having a film thickness.

Hereinafter, the present invention will be described in detail by means of examples according to the present invention and comparative examples not according to the present invention, but the scope of the present invention is not limited by the following examples.

Examples 1

A hard coat layer having a thickness of 2 μm was formed on a PET base material having a thickness of 50 μm, and a first metal oxide layer was formed on the hard coat layer. The hard coat layer is an organic-inorganic mixed layer set by the following steps: a composition containing silicon dioxide inorganic particles is applied to a multifunctional (meth)acrylate monomer with a bar coater, and then it is allowed to stand at 80°C It was dried under high temperature, and it was cured with ultraviolet light under a nitrogen atmosphere using a high-pressure mercury lamp with a cumulative light quantity of 600 mJ/cm 2. A metal oxide layer was formed from a ZnO layer with a thickness of 15 nm using a DC sputtering method under the conditions of 1.5 W/cm 2 and 3 mtorr. By using the DC sputtering method to deposit an Ag metal layer with a thickness of 13 nm on the first metal oxide layer under the conditions of 1.5 W/cm 2 and 3 mTorr, and set a thickness of 15 nm on the metal layer ZnO layer as the second metal oxide layer. The second metal oxide layer was also deposited using the DC sputtering method under the conditions of 1.5 W/cm 2 and 3 mtorr.

Finally, an infrared reflective film is produced by forming an outer coating with a thickness of 38 nm on the second metal oxide layer. The overcoat layer is produced by preparing an overcoat solution as follows and then coating it with a bar coater. By mixing 60 parts by weight of the monomer or polymer component and 38 parts by weight of the inorganic filler (MEK-AC-2140Z, Nissan Chemical) by mixing 100 parts by weight of the solid content in the outer coating, it is dispersed in Prepared by colloidal silica in an organic solvent, 10 nm to 15 nm in diameter, dispersing solvent: MEK) and 2 parts by weight of photoinitiator (color reinforcement 127, BASF, hydroxyacetophenone) Overcoat solution. When 60 parts by weight of the monomer or polymer component is regarded as 100 parts by weight, the monomer or polymer component consists of 1 part by weight of the phosphate compound (trademark MIRAMER SC1400, Miwon, phosphate methyl ester) Acrylate), 10 parts by weight of fluoroacrylate (DAC-HP, Daikin, perfluoropolyether acrylate), 20 parts by weight of thiol compound (Karenz MT PE1, Showa Electrician (SHOWA DENKO), tetrafunctional secondary SH, pentaerythritol (3-mercaptobutyl ester)) and 69 parts by weight of acrylic urethane oligomer (Miramer PU340, Meiyuan, aliphatic trifunctional acrylate) constitute. The overcoat solution thus prepared was coated on the second metal oxide layer with a bar coater, and then dried at 80°C, and was performed with ultraviolet rays using an ultra-high pressure mercury lamp with a cumulative light amount of 400 mJ/cm 2. Curing to form an overcoat layer as an organic-inorganic hybrid layer.

Examples 2

An infrared reflective film was produced in the same manner as in Example 1 except that 10 parts by weight of thiol-based compound was added.

Examples 3

An infrared reflective film was produced in the same manner as in Example 1 except that 30 parts by weight of thiol-based compound was added.

Comparative example 1

An infrared reflective film was produced in the same manner as in Example 1, except that no thiol compound was added.

Comparative example 2

An infrared reflective film was produced in the same manner as in Example 1, except that the thickness of the overcoat layer was set to 155 nm.

Comparative example 3

An infrared reflective film was produced in the same manner as in Example 2 except that the thickness of the overcoat layer was set to 155 nm.

Comparative example 4

An infrared reflective film was produced in the same manner as in Example 3 except that the thickness of the overcoat layer was set to 155 nm.

Comparative example 5

An infrared reflective film was produced in the same manner as in Comparative Example 1 except that the thickness of the overcoat layer was set to 155 nm.

Experimental example 1- Scratch resistant Sex

By applying ethanol to the dust-free cloth (Hansong Miraclean Cleanroom Wiper, polyester) with a load of 500 g and reciprocating the cloth 1000 times at a speed of 27 rpm, The surface of the outer coating of each of the infrared reflective films obtained in Examples and Comparative Examples was rubbed. When the outer coating is peeled off, it is classified as X; when one or more scratches of 1 cm or less are observed with the naked eye, it is classified as Δ; and when no scratches appear on the outer coating and When there is no change in appearance, it is classified as O.

Experimental example 2- Pencil hardness measurement

By preparing ASTM D 638 tensile specimens of infrared reflective films produced in Examples and Comparative Examples and using a pencil hardness tester from JUNGDO TESTING INSTRUMENT and pencils from Mitsubishi on the basis of ASTM D3362 On the measurement, where the load is 500 grams during the measurement. The pencil hardness is judged visually based on whether scratches appear.

The pencil hardness ratings are classified as follows.

6B-5B-4B-3B-2B-B-HB-F-H-2H-3H-4H-5H-6H-

[Table 1]

Here, Comparative Example 2 to Comparative Example 5 are excellent in scratch resistance, but it can be seen that the optical properties are reduced (such as the appearance of rainbow in appearance). When the thickness of the overcoat layer exceeds 100 nm, the far-infrared absorption increases, making it possible to confirm the tendency of the insulation of the entire film to decrease. In addition, when the thickness of the overcoat layer is thick, it can overlap with the wavelength range of visible light, and in this case, it can be confirmed that the pink phenomenon is caused by multiple reflections and interference at the interface.

10: Infrared reflective film 11: basal layer 12: Infrared reflection layer 13: outer coating

FIG. 1 is a cross-sectional view of an infrared reflective film according to an example of the present application.

10: Infrared reflective film

11: basal layer

12: Infrared reflection layer

13: outer coating

Claims (17)

An infrared reflective film, including: Basal layer An infrared reflecting layer provided on the base layer; and The outer coating layer is provided on the infrared reflective layer and is within a thickness range of 100 nm or less, The outer coating layer includes: a monomer or a polymer component; and a thiol compound. The infrared reflective film according to item 1 of the patent application range, wherein the infrared reflective layer includes a metal layer and a metal oxide layer. The infrared reflective film as described in item 2 of the patent application scope, wherein the metal layer includes titanium (Ti), silver (Ag), platinum (Pt), gold (Au), copper (Cu), chromium (Cr), Aluminum (Al), palladium (Pd) or nickel (Ni). The infrared reflective film as described in item 2 of the patent application range, wherein the metal oxide layer includes an oxide of at least one metal selected from the group consisting of: niobium (Nb), antimony (Sb), barium (Ba), gallium (Ga), germanium (Ge), hafnium (Hf), indium (In), lanthanum (La), magnesium (Mg), selenium (Se), silicon (Si), tantalum (Ta), titanium (Ti), vanadium (V), yttrium (Y), zinc (Zn), and tin (Sn). The infrared reflective film as described in item 1 of the patent application range, wherein the monomer or polymer component includes a photocurable oligomer. The infrared reflective film according to item 5 of the patent application scope, wherein the monomer or polymer component includes a monomer mixture, and the monomer mixture includes phosphoric acid (meth)acrylate; or fluorine (meth) )Acrylate. The infrared reflective film according to item 6 of the patent application range, wherein the monomer or polymer component includes 50 parts by weight to 99.9 parts by weight of the photocurable oligomer and 0.1 parts by weight to 10 parts by weight The phosphoric acid (meth)acrylates are described. The infrared reflective film according to item 6 of the patent application scope, wherein the monomer or polymer component includes 50 parts by weight to 99.9 parts by weight of the photocurable oligomer and 1 part by weight to 50 parts by weight The fluorine (meth)acrylate is described. The infrared reflective film according to item 6 of the patent application scope, wherein the monomer or polymer component includes 50 parts by weight to 99.9 parts by weight of the photocurable oligomer and 1 part by weight to 30 parts by weight. The thiol compounds. The infrared reflective film as described in item 1 of the patent application range, wherein the thiol compound is a multifunctional primary thiol compound or a polyfunctional secondary thiol compound. The infrared reflective film according to item 11 of the patent application range, wherein the thiol compound undergoes a chain transfer reaction by a thiol-ene reaction together with the monomer or polymer component. The infrared reflective film as described in item 1 of the patent application range, wherein the monomer or polymer component further includes a multifunctional acrylate. The infrared reflective film as described in item 1 of the patent application range, wherein the overcoat layer further includes an inorganic filler. The infrared reflective film according to item 13 of the patent application range, wherein the inorganic filler has an average particle diameter in the range of 5 nm to 100 nm as measured by a D50 particle size analyzer. The infrared reflective film according to item 13 of the patent application range, wherein the content of the inorganic filler is 1 part by weight to 70 parts by weight based on 100 parts by weight of the solid content in the overcoat layer. The infrared reflective film according to item 1 of the patent application scope, wherein the overcoat layer further includes a photoinitiator. The infrared reflective film as described in item 1 of the patent application scope further includes a hard coat layer disposed between the base layer and the infrared reflective layer.

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