JP2000190430A - Infrared cutoff film - Google Patents

Abstract

(57) [Problem] To provide an infrared ray cut-off film in which transparency of a film is ensured and adhesion between an infrared ray cut-off layer and a protective layer is improved. SOLUTION: An infrared cutoff layer 2 and a protective layer 3 are laminated on a surface of a base film 1 in this order, and an adhesive layer 4 is laminated on a back surface of the base film 1. A coating for an infrared cutoff layer, in which a powder that reflects or absorbs infrared rays is mixed and dispersed in an ultraviolet-curable resin coating containing an erythritol acrylate-based polyfunctional monomer and a photopolymerization initiator, was applied to the surface of the base film 1. After curing, an infrared cutoff layer 2 is formed, and a resin coating for a protective layer containing an ultraviolet-curable resin containing an erythritol acrylate-based polyfunctional monomer and a photopolymerization initiator is applied thereon. The protective layer 3 is formed by curing.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an infrared ray cut-off film which is mainly applied to a window glass of a building or an automobile for the purpose of shielding (cutting off) infrared rays of sunlight.

[0002]

2. Description of the Related Art A functional film having an infrared cutoff function that is light-transmissive to light in the visible region and reflects or absorbs light in the infrared region is mainly composed of:
It has been conventionally used to suppress the thermal effect of radiated sunlight. For example, by sticking to a window glass of a building, a car, or the like, the heat can be suppressed even when directly receiving solar radiation through the window glass. In summer, the rise in room temperature is suppressed, and cooling efficiency is improved. In winter, indoor heat retention efficiency is improved. Further, there is an additional effect that scattering is prevented when the window glass is broken. A conventional infrared cutoff film generally has a configuration in which an infrared cutoff layer and an adhesive layer are laminated on a back surface of a base film in this order, and a protective layer is laminated on the surface of the base film. It is intended to be used by pasting it on the like.

[0003] Conventionally, the infrared cut-off layer has been formed by various infrared cut-off agents (for example, immonium, aminium,
Laminated on the base film by ZnO, SnO ₂ , ITO (tin-containing indium oxide powder), Au, etc., by vacuum evaporation, sputtering, or a method of dispersing it in a resin to form a coating for an infrared cutoff layer and applying the same. It had been.

However, in order to form the infrared cut-off agent on a base film by a vacuum evaporation method or a sputtering method, a device capable of controlling a high vacuum and a high-precision atmosphere must be used. However, there have been problems such as an increase in the mass and poor mass productivity. Therefore, as a method of forming a thin film free of such a drawback, the above-mentioned coating method is more suitable. The resin used for forming the infrared cutoff layer by the coating method has high transparency, and is an ultraviolet curable resin such as an acrylic resin, a urethane resin, an epoxy resin, or a melamine resin or a polyurethane. Resin, silicone resin, thermosetting resin such as silicone modified resin, and furthermore, acrylic, urethane, polyester-based thermoplastic resin, etc.
A general resin for forming a coating film is appropriately selected and used.

[0005]

By the way, on the surface of the infrared cut-off layer laminated on the base film by a coating method, an infrared cut-off agent is deposited to form fine irregularities. Even with the pressure-sensitive adhesive layer, the pressure-sensitive adhesive is a polymer, so it is not filled enough and air remains,
As a result, the transparency of the entire film may be deteriorated. Therefore, the present inventor has proposed a configuration in which an infrared cutoff layer is arranged on the protective layer side where a resin having a property different from that of the resin used for the adhesive layer is used, that is, an infrared cutoff layer and a protective layer are arranged in this order on the surface of the base film. We tried to make a configuration of stacking. According to this, the irregularities on the surface of the infrared cutoff layer were sufficiently filled with the resin of the protective layer to be applied, and the transparency was secured. However, according to this configuration, it was newly found that the protective layer was easily peeled off from the infrared cutoff layer, and that there was a problem in the adhesion between the infrared cutoff layer and the protective layer.

Accordingly, it is an object of the present invention to provide an infrared cut-off film which ensures the transparency of the film and improves the adhesion between the infrared cut-off layer and the protective layer.

[0007]

Means for Solving the Problems The present invention relates to a resin used for an infrared cut-off layer and a protective layer. Having a component of at least an erythritol acrylate-based polyfunctional monomer as a polymerization component, and in the case of an ultraviolet-curable resin cured using a photopolymerization initiator, particularly when the adhesion is significantly improved. I found it. Therefore, the present invention has been made based on such knowledge, the infrared cutoff layer and the protective layer are laminated in this order on the surface of the base film, while the adhesive layer is laminated on the back surface of the base film. Infrared cut-off layer has an erythritol acrylate-based polyfunctional monomer as a polymerization component, an ultraviolet-curable resin cured using a photopolymerization initiator, and a powder that reflects or absorbs infrared light. The protective layer is characterized by containing at least an erythritol acrylate-based polyfunctional monomer as a polymerization component and an ultraviolet curable resin cured by using a photopolymerization initiator.

[0008]

Next, an embodiment of the present invention will be described. FIG. 1 shows a practically preferable layer structure of the infrared cutoff film of the present invention. An infrared cutoff layer 2 and a protective layer 3 are laminated on a surface of a base film 1 in this order. The adhesive layer 4 and the separate material 5 are laminated in this order on the back surface of. In use, the separation material 5 is peeled off from the adhesive layer 4, and the adhesive layer 4 is attached to glass or the like for use.

The infrared cut-off layer 2 is obtained by mixing and dispersing an infrared cut-off agent powder in the resin of the present invention to obtain a coating for the infrared cut-off layer, and applying this coating to the surface of the base film 1. Formed by Examples of a method for applying the coating material for the infrared cutoff layer on the surface of the base film 1 include a doctor blade coating method, a gravure coating method, and a dip coating method. The thickness of the coating film is 0.5 to 10 μm, preferably 0.5 to 5 μm.

Next, the materials constituting each layer of the infrared cutoff film of the present invention having the above-mentioned structure will be described in detail. A. Base Film As the base film, a known transparent film can be used. Specific examples thereof include PET (polyethylene terephthalate), TAC (triacetyl cellulose), polyarylate, polyether, polycarbonate, polysulfone, polyethersulfone, cellophane, PEN (polyethylene naphthalate) such as polyethylene 2,6 naphthalate, and polyethylene. Various resin films such as polypropylene, polyvinyl alcohol and the like can be suitably used.

B. Infrared cut-off agent Powders as the infrared cut-off agent contained in the infrared cut-off layer of the present invention include Al, Au, Ag, SnO ₂ ,
At least one of ITO (tin-containing indium oxide), ZnO, and phthalocyanine pigments is used. From the viewpoint of transparency and dispersibility, such powders are preferably those having an average particle size of 100 nm or less, more preferably 50 nm or less, and most preferably 25 to 35 nm.
As the powder of the infrared cutoff agent, ITO powder is most preferable from the viewpoint of transparency, color, infrared cutoff function and the like.

The ITO powder is produced by a generally known production method, that is, an aqueous solution containing a small amount of a water-soluble salt of In and Sn is reacted with an alkali to co-precipitate a hydroxide of In and Sn. After that, this raw material is converted into CO, N
A material which is heated and baked in a reducing atmosphere such as H ₃ or H ₂ and converted into an oxide is used. In this case, the ITO powder is obtained by sintering the raw material under heating in a reducing atmosphere. The molar ratio of In / Sn / O ₂ is 100/5 to 10%.
/0.5-10, preferably 100 / 5-10 / 0.5
~ 2. The ITO powder thus reduced has a blue color and has a shortest infrared cutoff wavelength of 80.
It has a very good infrared cutoff function of 0 nm.

C. The resin used in the infrared cutoff layer The resin in which the powder of the infrared cutoff agent is mixed and dispersed includes at least one erythritol acrylate polyfunctional monomer as an acrylic compound as a polymerization component, a photo-radical polymerization initiator and / or Alternatively, an ultraviolet curable resin that is cured by using a cationic photopolymerization initiator is essential, and an epoxy compound may be further contained in the ultraviolet curable resin as a copolymerization component.

Examples of the epoxy compound include glycidyl ethers such as tetramethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, bisphenol A-diglycidyl ether, and 2-hydroxy-3.
-Phenoxypropyl acrylate, bisphenol A
And monomers and oligomers such as epoxy esters such as -diepoxy-acrylic acid adducts and alicyclic epoxies having the following chemical formula.

[0015]

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The erythritol acrylate polyfunctional monomer includes dipentaerythritol hexaacrylate, tripentaerythritol octaacrylate,
And tetrapentaerythritol decaacrylate.

In the infrared cutoff layer of the present invention, in addition to these erythritol acrylate-based polyfunctional monomers,
Another acrylic compound can be contained as a copolymer component. Such acrylic compounds include lauryl acrylate, ethoxydiethylene glycol acrylate, methoxytriethylene glycol acrylate, phenoxyethyl acrylate, tetrahydrofurfuryl acrylate, isobornyl acrylate,
Monofunctional acrylates such as -hydroxyethyl acrylate, 2-hydroxypropyl acrylate and 2-hydroxy-3-phenoxy acrylate; polyfunctional acrylates such as neopentyl glycol diacrylate, 1,6-hexanediol diacrylate and trimethylolpropane triacrylate , Trimethylolpropane benzoate, acrylic acid derivatives such as trimethylpropane benzoate, 2-ethylhexyl methacrylate, n-stearyl methacrylate, cyclohexyl methacrylate, tetrahydrofurfuryl methacrylate, 2-hydroxyethyl methacrylate,
Methacrylic acid derivatives such as monofunctional methacrylates such as 2-hydroxybutyl methacrylate, polyfunctional methacrylates such as 1,6-hexanediol dimethacrylate, trimethylolpropane trimethacrylate, and glycerin dimethacrylate; glycerin dimethacrylate hexamethylene diisocyanate; pentaerythritol In addition to monomers and oligomers such as urethane acrylates such as triacrylate hexamethylene diisocyanate, those containing at least one compound having the following chemical formula are used.

[0018]

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As the photo-radical polymerization initiator, for example,
An acetophenone compound represented by the following chemical formula,

Embedded image For example, a benzoin-based compound represented by the following chemical formula can be used.

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As the cationic photopolymerization initiator, for example,
A compound having the following chemical formula can be given. These compounds may be used alone or in a mixture of two or more.

[0021]

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The amount of the photoradical polymerization initiator and / or the cationic photopolymerization initiator is 0.1 to 1 with respect to the main component.
A range of 0% by weight is desirable. The basis for this amount is 0.
If the amount is less than 1% by weight or more than 10% by weight, ultraviolet curing is insufficient.

The higher the transparency of the resin forming the infrared cutoff layer, the better, and the light transmittance according to "JISC6714" should be 80% or more, preferably 90% or more. Further, in order for the infrared cut-off layer to be easily applied to the base film and to have high adhesion, the higher the wettability, the better. Specifically, the surface is determined according to “JIS K6768”. The wetting index (surface tension: dyn / cm) may be 50 or less, and more preferably 36 to 46.

The mixing ratio of the powder of the infrared cut-off agent and the resin constituting the coating material for the infrared cut-off layer is such that the weight ratio of the powder to the resin is 90/10 to 60/40, preferably 85.
/ 15 to 65/35, more preferably 80/20 to 7
In the case of 0/30, a good infrared cutoff performance can be obtained even with a thin layer of about 1 μm, and a film having high transparency and less haze can be obtained. 9 powder mixing ratio
When the content is more than 0% by weight, the powder is colored or the degree of haze increases, and the metallic luster increases.
It causes peeling and cohesive failure of the infrared cut-off layer, and further, poor adhesion to the base film. If the mixing ratio of the powder is less than 60% by weight, the intended infrared cutoff cannot be achieved.

D. Pigment In the present invention, ZnO, Sn
Pigments such as O ₂ and TiO ₂ can be mixed. That is, these pigments are mixed with the resin together with the powder of the infrared cutoff agent to form an infrared cutoff layer. The pigment performs an infrared cutoff function together with the powder, and its infrared cutoff wavelength region is 1200 to 2500 nm. Therefore, when combined with the powder of an infrared cutoff agent, 800 to 2500 called the near infrared region is obtained.
The mixing ratio of the powder to the resin can be set lower within the above range without deteriorating the cutoff performance of the infrared wavelength of nm. Infrared cutoff agent powder is I
In the case of the TO powder, since the ITO powder is expensive, the cost can be reduced by reducing the amount of the ITO powder. Further, it is necessary that these pigments have an average particle size of 100 nm or less in order to suppress metallic luster and achieve good electromagnetic wave transmittance.

E. Protective Layer As the resin used for the protective layer, one or more erythritol acrylate-based polyfunctional monomers as an acrylic compound, which is the same as the resin used for the infrared cutoff layer, is used as a polymerization component, and a photo-radical polymerization initiator and / or An ultraviolet-curable resin cured using a cationic polymerization initiator is essential.

The erythritol acrylate-based polyfunctional monomers include dipentaerythritol hexaacrylate, tripentaerythritol octaacrylate,
And tetrapentaerythritol decaacrylate. In the protective layer of the present invention, general ionizing radiation,
A resin that is cured by any of heat or a combination thereof can also be used. As the radiation-curable resin, a composition obtained by appropriately mixing monomers, oligomers, and prepolymers having a polymerizable unsaturated bond such as an acryloyl group, a methacryloyl group, an acryloyloxy group, and a methacryloyloxy group is used. Examples of the monomer include styrene, methyl acrylate, methyl methacrylate, methoxy polyethylene methacrylate, cyclohexyl methacrylate, phenoxyethyl methacrylate, ethylene glycol dimethacrylate, dipentaerythritol hexaacrylate, trimethylolpropane trimethacrylate, and the like. Oligomers,
Examples of the prepolymer include acrylates such as polyester acrylate, polyurethane acrylate, epoxy acrylate, polyether acrylate, alkitol acrylate, melamine acrylate, and silicone acrylate, unsaturated polyester, and epoxy compounds. These may be used alone or in combination of two or more. Monomers are preferred if the flexibility of the cured film is required. In order to further reduce the crosslinking density, it is preferable to use monofunctional or bifunctional acrylate monomers. When severe durability such as resistance, abrasion resistance and solvent resistance is required, it is preferable to increase the amount of the monomer and use a trifunctional or higher functional acrylate monomer.

In order to cure the ionizing radiation-curable resin as described above, radiation such as, for example, ultraviolet rays, electron beams, or X-rays may be applied. If necessary, a polymerization initiator can be appropriately added. . In the case of curing by ultraviolet rays, it is necessary to add a photopolymerization initiator. Examples of the photopolymerization initiator include diethoxyacetophenone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, benzyldimethylketal, 1-hydroxycyclohexyl-phenylketone, 2-methyl-2-morpholino (4
Acetophenones such as -thiomethylphenyl) propan-1-one; benzoin ethers such as benzoin methyl ether, benzoin ethyl ether, benzoin isopropyl ether, and benzoin isobutyl ether;
Benzophenone, methyl o-benzoylbenzoate, 4-
Phenylbenzophenone, 4-benzoyl-4'-methyl-diphenylsulfide, 4-benzoyl-N, N
-Dimethyl-N- [2- (1-oxo-2-propenyloxy) ethyl] benzenemethanaminium bromide,
Benzophenones such as (4-benzoylbenzyl) trimethylammonium chloride; thioxanthones such as 2,4-diethylthioxanthone and 1-chloro-4-dichlorothioxanthone; and 2,4,6-trimethylbenzoyldiphenylbenzoyl oxide. it can. These can be used alone or in combination of two or more. Further, N, N- is used as an accelerator (sensitizer).
Amine compounds such as dimethyl paratoluidine and 4,4'-diethylaminobenzenephenone can be mixed and used.

Further, as a resin used as a protective agent, it is particularly preferable to use an ultraviolet-curable epoxy compound in terms of excellent hardness and transparent adhesiveness. Specific epoxy compounds include glycidyl ethers such as tetramethylene glycol diglycidyl ether, propylene glycol diglycidyl ether, neopentyl glycol diglycidyl ether, bisphenol A-diglycidyl ether, 2-hydroxy-3-phenoxypropyl acrylate, Examples include epoxy esters such as bisphenol A-diepoxy-acrylic acid adducts.
As the polymerization initiator, a photoradical polymerization initiator and / or a cationic photopolymerization initiator can be used, and examples thereof include the same ones as those used for the infrared cutoff layer. The compounding amount is 0.1 to 10 with respect to the main agent.
A range of weight percent is desirable. This amount is 0.1% by weight
If less, or more than 10% by weight, UV curing is insufficient.

F. The pressure-sensitive adhesive forming the pressure-sensitive adhesive layer is, for example, an acrylic pressure-sensitive adhesive made of a resin mainly containing an acrylic ester or a methacrylic acid ester, and if necessary, a curing agent such as a metal chelate or an isocyanate system,
One or a mixture of two or more epoxy-based crosslinking agents is used. Such an adhesive has an adhesive strength (according to JIS Z0237) as an adhesive layer of 100 to 2000 g.
/ 25 mm is practically preferable. The thickness of the adhesive layer is usually 10 to 50 after drying.
It is preferably about μm. Further, by appropriately adding an ultraviolet absorber to the adhesive layer, an ultraviolet cutoff effect can also be obtained. As the UV absorber,
pt-butylphenyl salicylate, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-
Octoxybenzophenone, 2,2'-dihydroxy-
4-methoxybenzophenone, 2 '-(2'-hydroxy-5-methylphenyl) benzotriazole, 2-
(2'-hydroxy-3'-tert-butyl-5'-methylphenyl) -5-chlorobenzotriazole, 2-
(2'-hydroxy-3 ', 5'-di-t-butylphenyl) benzotriazole and the like are preferably used.

G. Other materials・ Solvent added to paint for infrared cut-off layer Paint for infrared cut-off layer is composed of powder and resin of infrared cut-off agent, and benzene, toluene, acetone, methyl ethyl ketone, isophorone, One or more organic solvents such as cyclohexanone can be appropriately added. -Surfactant added to infrared cut-off layer paint A small amount of surfactant (for example, nonionic) is added to the infrared cut-off layer paint for the purpose of improving the dispersibility of the powder of the infrared cut-off agent. Can be.

Although the present invention is directed to a film whose main purpose is to cut off infrared rays, it is possible to appropriately add the above-mentioned ultraviolet absorber to at least one of the other layers as in the case of the above-mentioned adhesive layer. Accordingly, an ultraviolet cutoff effect can be obtained together.

[0033]

Next, the present invention will be described in more detail by way of examples. Note that “parts” means “parts by weight”.

-Formulation of paint for infrared cutoff layer and protective layer-[Example 1] A) UV curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 47 parts of pentaerythritol triacrylate-Photo radical Polymerization initiator: 3 parts Irgacure 184, manufactured by Ciba-Geigy Co., Ltd. Solvent: 50 parts of cyclohexanone B) UV-curable resin coating for protective layer • Acrylic polyfunctional monomer: 47 parts of pentaerythritol triacrylate • Photo-radical polymerization initiator: manufactured by Ciba-Geigy Irgacure 184 3 parts ・ Solvent: methyl ethyl ketone 50 parts

Example 2 A) UV-curable resin paint for infrared cut-off layer ・ Acrylic polyfunctional monomer: 47 parts of dipentaerythritol hexaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba-Geigy ・ Solvent : Cyclohexanone 50 parts B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: 47 parts of dipentaerythritol hexaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

[Example 3] A) UV-curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 32 parts of tripentaerythritol octacrylate-Epoxy monomer: 15 parts of trimethylene glycol diglycidyl ether-Photo radical polymerization initiation Agent: Ciba Geigy Co., Ltd. 3 parts Irgacure 184 ・ Solvent: Cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: Tripentaerythritol octaacrylate 47 parts ・ Photoradical polymerization initiator: Ciba Geigy Co., Ltd. Cure 184 3 parts ・ Solvent: methyl ethyl ketone 50 parts

[Example 4] A) UV-curable resin paint for infrared cut-off layer-Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol decaacrylate-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy-Solvent : Cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts of pentaerythritol tetraacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

[Example 5] A) UV-curable resin paint for infrared cut-off layer-Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol decaacrylate-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy-Solvent : Cyclohexanone 50 parts B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: 47 parts of dipentaerythritol hexaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

[Example 6] A) UV-curable resin paint for infrared cut-off layer-Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol decaacrylate-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy-Solvent : Cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: Tripentaerythritol hexaacrylate 47 parts ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts methyl ethyl ketone

Example 7 A) UV curable resin paint for infrared cut-off layer ・ Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol decaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba-Geigy ・ Solvent : Cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol decaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

Example 8 A) UV Curable Resin Paint for Infrared Cut-Off Layer ・ Acrylic polyfunctional monomer: 23 parts pentaerythritol triacrylate 23 parts dipentaerythritol tetraacrylate 23 parts ・ Photoradical polymerization initiator: Irga, manufactured by Ciba Geigy Cure 184 4 parts ・ Solvent: Cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts pentaerythritol triacrylate ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy ・ Solvent: Methyl ethyl ketone 50 parts

Example 9 A) UV curable resin paint for infrared cut-off layer ・ Acrylic polyfunctional monomer: 23 parts pentaerythritol triacrylate 23 parts dipentaerythritol tetraacrylate ・ Photoradical polymerization initiator: Irga, manufactured by Ciba-Geigy Cure 184 4 parts ・ Solvent: Cyclohexanone 50 parts B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: 47 parts dipentaerythritol tetraacrylate ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy ・ Solvent : 50 parts of methyl ethyl ketone

Example 10 A) UV curable resin paint for infrared cutoff layer ・ Acrylic polyfunctional monomer: 23 parts of tripentaerythritol hexaacrylate 23 parts of tetrapentaerythritol octacrylate 23 ・ Photoradical polymerization initiator: manufactured by Ciba Geigy Irgacure 184 4 parts ・ Solvent: cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts pentaerythritol tetraacrylate ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy ・ Solvent : 50 parts of methyl ethyl ketone

[Example 11] A) UV-curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 23 parts of tripentaerythritol hexaacrylate 23 parts of tetrapentaerythritol octaacrylate 23 parts-Photoradical polymerization initiator: manufactured by Ciba Geigy Irgacure 184 4 parts ・ Solvent: cyclohexanone 50 parts B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: 47 parts dipentaerythritol pentaacrylate ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Solvent: 50 parts of methyl ethyl ketone

[Example 12] A) UV-curable resin paint for infrared cut-off layer ・ Acrylic polyfunctional monomer: 23 parts of tripentaerythritol hexaacrylate 23 parts of tetrapentaerythritol octacrylate 23 ・ Photoradical polymerization initiator: manufactured by Ciba-Geigy Irgacure 184 4 parts ・ Solvent: cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol octaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Solvent: 50 parts of methyl ethyl ketone

Example 13 A) UV-curable resin paint for infrared cut-off layer Acrylic polyfunctional monomer: 15 parts dipentaerythritol hexaacrylate 15 parts tripentaerythritol octacrylate 15 parts tetrapentaerythritol decaacrylate 17 parts photo radical Polymerization initiator: 3 parts Irgacure 184, manufactured by Ciba-Geigy Co., Ltd. Solvent: 50 parts of cyclohexanone B) UV-curable resin coating for protective layer • Acrylic polyfunctional monomer: 47 parts of pentaerythritol triacrylate • Photo-radical polymerization initiator: manufactured by Ciba-Geigy Irgacure 184 3 parts ・ Solvent: methyl ethyl ketone 50 parts

Example 14 A) UV-curable resin paint for infrared cut-off layer Acrylic polyfunctional monomer: 15 parts dipentaerythritol hexaacrylate 15 parts tripentaerythritol octaacrylate 17 parts Tetrapentaerythritol decaacrylate 17 parts Photoradical Polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy Co., Ltd. Solvent: 50 parts cyclohexanone B) UV-curable resin coating for protective layer • Acrylic polyfunctional monomer: 47 parts dipentaerythritol tetraacrylate • Photo-radical polymerization initiator: Ciba-Geigy 3 parts of Irgacure 184 ・ Solvent: 50 parts of methyl ethyl ketone

Example 15 A) UV curable resin paint for infrared cutoff layer ・ Acrylic polyfunctional monomer: 15 parts dipentaerythritol hexaacrylate 15 parts tripentaerythritol octacrylate 15 parts tetrapentaerythritol decaacrylate 17 parts ・ Photoradical Polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd. Solvent: 50 parts cyclohexanone B) UV curable resin coating for protective layer • Acrylic polyfunctional monomer: 47 parts tripentaerythritol heptaacrylate • Photo radical polymerization initiator: Ciba Geigy Co. 3 parts of Irgacure 184 ・ Solvent: 50 parts of methyl ethyl ketone

[Example 16] A) UV curable resin paint for infrared cut-off layer-Acrylic polyfunctional monomer: 15 parts of dipentaerythritol hexaacrylate 15 parts of tripentaerythritol octaacrylate 17 parts 17 parts of tetrapentaerythritol decaacrylate-Photoradical Polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd. Solvent: 50 parts cyclohexanone B) UV curable resin paint for protective layer • Acrylic polyfunctional monomer: 47 parts tetrapentaerythritol decaacrylate • Photo radical polymerization initiator: Ciba Geigy Co. 3 parts of Irgacure 184 ・ Solvent: 50 parts of methyl ethyl ketone

[Example 17] A) UV-curable resin coating material for infrared cut-off layer-Acrylic polyfunctional monomer: 15 parts of dipentaerythritol hexaacrylate 15 parts of tripentaerythritol octacrylate 15 parts of tetrapentaerythritol decaacrylate-Photoradical Polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy Co., Ltd. Solvent: 50 parts cyclohexanone B) UV-curable resin coating for protective layer-Acrylic polyfunctional monomer: 23 parts pentaerythritol acrylate 23 parts tetrapentaerythritol decaacrylate 23 parts-Photoradical polymerization Initiator: 4 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd.Solvent: 50 parts methyl ethyl ketone

Example 18 A) UV Curable Resin Paint for Infrared Cutoff Layer Acrylic Polyfunctional Monomer: 12 parts of pentaerythritol triacrylate 12 parts of dipentaerythritol pentaacrylate 12 parts of tripentaerythritol hexaacrylate 12 parts of tetrapentaerythritol octa 12 parts of acrylate ・ Photoradical polymerization initiator: 2 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of cyclohexanone B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts of pentaerythritol triacrylate ・ Photoradical polymerization Initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy ・ Solvent: 50 parts methyl ethyl ketone

Example 19 A) UV Curable Resin Paint for Infrared Cutoff Layer Acrylic polyfunctional monomer: 12 parts pentaerythritol triacrylate 12 parts dipentaerythritol pentaacrylate 12 parts tripentaerythritol hexaacrylate 12 parts tetrapentaerythritol octa 12 parts of acrylate-Photoradical polymerization initiator: 2 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd.-Solvent: 50 parts of cyclohexanone B) UV-curable resin coating for protective layer-Acrylic polyfunctional monomer: 47 parts of tetrapentaerythritol octacrylate-Photoradical Polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd.Solvent: 50 parts methyl ethyl ketone

Example 20 A) UV-curable resin paint for infrared cut-off layer Acrylic polyfunctional monomer: pentaerythritol triacrylate 12 parts dipentaerythritol pentaacrylate 12 parts tripentaerythritol hexaacrylate 12 parts tetrapentaerythritol octa 12 parts of acrylate ・ Photoradical polymerization initiator: 2 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of cyclohexanone B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 15 parts of dipentaerythritol pentaacrylate 15 parts of tripentaerythritol Hexaacrylate 15 parts Tetrapentaerythritol octaacrylate 17 parts-Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba-Geigy-Solvent: methyl Ethyl ketone 50 parts

[Comparative Example 1] A) UV-curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 47 parts of 2-ethylhexyl-diglycol acrylate-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba-Geigy・ Solvent: 50 parts of cyclohexanone B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: 47 parts of pentaerythritol tetraacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

[Comparative Example 2] A) UV-curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 47 parts of dipentaerythritol tetraacrylate-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd.-Solvent : Cyclohexanone 50 parts B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts of trimethylolpropane triacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

[Comparative Example 3] A) UV-curable resin paint for infrared cut-off layer-Acrylic polyfunctional monomer: 23 parts pentaerythritol triacrylate 23 parts dipentaerythritol tetraacrylate-Photoradical polymerization initiator: Irga manufactured by Ciba Geigy Cure 184 4 parts ・ Solvent: Cyclohexanone 50 parts B) UV-curable resin coating for protective layer ・ Acrylic polyfunctional monomer: Trimethylolpropane triacrylate 47 parts ・ Photoradical polymerization initiator: Ciba Geigy Co., Ltd. Irgacure 184 3 parts ・ Solvent : 50 parts of methyl ethyl ketone

[Comparative Example 4] A) UV-curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 23 parts pentaerythritol triacrylate 23 parts dipentaerythritol tetraacrylate-Photoradical polymerization initiator: Irga, manufactured by Ciba Geigy Cure 184 4 parts ・ Solvent: Cyclohexanone 50 parts B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: 47 parts of ditrimethylolpropane tetraacrylate ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent : 50 parts of methyl ethyl ketone

[Comparative Example 5] A) UV curable resin paint for infrared cut-off layer-Acrylic polyfunctional monomer: 47 parts of trimethylene glycol diglycidyl ether-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba-Geigy Solvent: 50 parts of cyclohexanone B) UV curable resin paint for protective layer ・ Acrylic polyfunctional monomer: 47 parts of dipentaerythritol hexaacrylate ・ Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts of methyl ethyl ketone

[Comparative Example 6] A) UV-curable resin paint for infrared cutoff layer-Acrylic polyfunctional monomer: 47 parts of pentaerythritol tetraacrylate-Photoradical polymerization initiator: 3 parts of Irgacure 184 manufactured by Ciba Geigy Co.-Solvent: Cyclohexanone 50 parts B) UV curable resin coating for protective layer ・ Acrylic polyfunctional monomer: trimethylene glycol diglycidyl ether 47 parts ・ Photoradical polymerization initiator: 3 parts Irgacure 184 manufactured by Ciba Geigy Co., Ltd. ・ Solvent: 50 parts methyl ethyl ketone

-Preparation of infrared cut-off film- Infrared cut-off agent (ITO powder: average primary particle diameter: about 50 nm, component molar ratio: In / Sn / O ₂ = 100/5)
/0.9) was added to the resin coating of the infrared cutoff layer of Examples 1 to 20 and Comparative Examples 1 to 6,
The resin was mixed at a weight ratio of 80/20 to prepare a coating for the infrared cutoff layer, and the coating for the infrared cutoff layer was coated with a 50 μm thick PET film (manufactured by Unitika).
The thickness after drying is 0.5-3 on the surface of the emblem MS).
It was applied to a thickness of μm. After that, it is dried with hot air of 105 ° C., and further cured by irradiating with 120 W of ultraviolet light,
An infrared cutoff layer was formed. Next, these Examples 1
On the surfaces of the infrared cut-off layers of Comparative Examples 1 to 6 and Comparative Examples 1 to 6, the resin coatings of the protective layers of Examples 1 to 20 and Comparative Examples 1 to 6 were applied so that the thickness after drying would be 2 to 3 µm. After that, drying with hot air of 105 ° C.
The protective layer was formed by irradiating with UV light of 0 W and curing.
Thereby, the infrared cutoff films of Examples 1 to 20 and Comparative Examples 1 to 6 were produced.

-Test- Adhesion The adhesion of the infrared cut-off layer or the protective layer immediately after the production was examined by a grid test specified in "JIS K5600". The evaluation is as follows. ◎: very excellent adhesion (number of crosscuts that cannot be peeled / total number of crosscuts (100) = 100/100)…: sufficient adhesion (90 to 99/100)…: some problem in practical use ( 80 ~ 89/100) ×… There is a problem in practical use (79 or less / 100) Weather resistance UV long life fade meter (FAL-AU)
The degree of deterioration of the adhesiveness of the infrared cutoff layer or the protective layer 200 hours after the production of the film using the mold was examined and evaluated by a grid test in the same manner as described above. Haze value The transparency of the infrared cut-off film is measured according to “JIS K7
105 ". Table 1 shows the evaluation results of the above tests.

[0062]

[Table 1]

As is clear from Table 1, it was confirmed that the infrared cutoff films of the examples according to the present invention had high adhesiveness and satisfactory transparency.
On the other hand, in each comparative example in which the infrared cutoff layer and the protective layer do not contain a common erythritol acrylate polyfunctional monomer as a polymerization component, adhesion and transparency are insufficient, and the effects of the present invention are apparent. It became.

[0064]

As described above, according to the infrared cutoff film of the present invention, the erythritol acrylate polyfunctional monomer common to the infrared cutoff layer and the protective layer is contained as a polymerization component. This has the effect of greatly improving the adhesion between the two layers and ensuring the transparency.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an example of a layer configuration of an infrared cutoff film according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Base film, 2 ... Infrared cutoff layer, 3 ... Protective layer, 4 ... Adhesive layer, 5 ... Separate material.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) G02B 5/26 G02B 5/26 // C09J 7/02 C09J 7/02 Z

Claims (1)

[Claims] 1. An infrared cutoff layer and a protective layer are laminated on a surface of a base film in this order, while an adhesive layer is laminated on a back surface of the base film, wherein the infrared cutoff layer is formed of at least erythritol. An acrylate-based polyfunctional monomer as a polymerization component, containing an ultraviolet-curable resin cured by using a photopolymerization initiator, and a powder that reflects or absorbs infrared rays, wherein the protective layer is at least an erythritol acrylate-based polyfunctional monomer. An infrared cut-off film comprising: a polymerizable component; and an ultraviolet curable resin cured by using a photopolymerization initiator.