JP2009128770A - Anti-reflection film having uv absorption, and manufacturing method thereof - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an anti-reflection film having ultraviolet ray absorption, exhibiting the excellent UV absorption, suppressing reflection of light, and enhancing durability, and to provide a manufacturing method thereof. <P>SOLUTION: This anti-reflection film 1 having the UV absorption includes a hardcoat layer 3 and an anti-reflection layer 4 laminated in this order on a transparent base material film 2, and also includes a pressure sensitive adhesive layer 5 on the transparent base material film 2 opposite the anti-reflection layer 4. The pressure sensitive adhesive layer 5 is formed by curing a UV-curable pressure sensitive adhesive composition containing a reactive polymer (A component), a photopolymerization initiator (B component), a monomer (C component) having a polymerizable double bond, and a UV absorbent (D component). A weight-average molecular weight MW of the reactive polymer (A component) is 50,000-800,000, and an absorbance of the pressure sensitive adhesive layer 5 is set to 1.3-2.7 in 380 nm of light wavelength, by the UV absorbent (D component). <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an antireflective film having ultraviolet absorptivity using, for example, an ultraviolet curable pressure-sensitive adhesive composition that is used by sticking to a plasma display panel and including an ultraviolet absorber as an adhesive layer, and a method for producing the same. is there.

  In recent years, electronic image display devices (electronic displays) are widely used for televisions and monitors. Among them, a plasma display panel (PDP) has received much attention as being optimal for a large screen flat display panel, and an antireflection film is provided on the surface for improving visibility. On the transparent base film opposite to the antireflection layer of the antireflection film, the adhesive required for adhering to other functional films and glass used for the front plate is applied. It is common.

  As the pressure-sensitive adhesive, for example, a pressure-sensitive adhesive for optical members obtained by crosslinking reaction of a pressure-sensitive adhesive composition composed of an acrylic polymer and an isocyanate compound is known (for example, see Patent Document 1). This pressure-sensitive adhesive is obtained by aging a pressure-sensitive adhesive composition comprising an acrylic polymer and an isocyanate compound, for example, at 23 ° C. for 7 days. However, such an adhesive requires aging (curing) time of 7 days at room temperature until an acrylic polymer and an isocyanate compound are mixed and the crosslinking reaction is completed and the adhesive performance is stabilized. Therefore, in order to shorten the aging time, an ultraviolet curable pressure-sensitive adhesive that can be obtained in a short time by ultraviolet irradiation has been developed.

As such an ultraviolet curable pressure-sensitive adhesive composition, a composition containing a reactive polymer and a photopolymerization initiator as essential components is known (see, for example, Patent Document 2). According to this ultraviolet curable pressure-sensitive adhesive composition, it can be quickly cured by the irradiation of ultraviolet rays to develop an adhesive force.
JP 2004-91500 A (pages 2 and 7) JP-A-2006-282805 (page 2, page 14 and page 17)

  However, the ultraviolet curable pressure-sensitive adhesive composition described in Patent Document 2 is specifically composed of a reactive polymer, a photopolymerization initiator, and a monomer having a polymerizable double bond (Patent Document). 2 Examples 1-9). For this reason, the laminated body in which the ultraviolet curable adhesive composition which apply | coated this on a polyethylene terephthalate (PET) film and in which the adhesive layer was formed does not have ultraviolet absorptivity. Therefore, when such a laminate is applied to the back surface of the antireflection film and used for a plasma display panel or the like, there is a problem that components such as a color tone correction pigment contained in the plasma display panel are deteriorated by ultraviolet rays. Furthermore, Patent Document 2 does not specifically disclose that the ultraviolet curable pressure-sensitive adhesive composition can be applied to an antireflection film, and thus the reflectance, absorbance, light transmittance, etc. of the antireflection film are improved. I could not know about such a configuration.

  Therefore, an object of the present invention is to provide an antireflection material having an ultraviolet absorption property that can exhibit excellent ultraviolet absorption properties, can suppress reflection of light, and can improve durability. It is in providing a film and its manufacturing method.

  In the present invention, the antireflection film having ultraviolet absorptivity according to the first aspect of the present invention is formed by laminating a hard coat layer and an antireflection layer in this order on the transparent substrate film, and is on the side opposite to the side where the antireflection layer is provided. An adhesive layer is provided on the transparent substrate film. The pressure-sensitive adhesive layer contains a reactive polymer (component A), a photopolymerization initiator (component B), a monomer having a polymerizable double bond (component C), and an ultraviolet absorber (component D). The weight average molecular weight (MW) of the reactive polymer (component A) is 50,000 to 800,000, and the wavelength of light at 380 nm is increased by the ultraviolet absorber (component D). The absorbance of the pressure-sensitive adhesive layer is set to 1.3 to 2.7.

  The antireflection film having ultraviolet absorptivity according to the second invention is the anti-reflection film according to the first invention, wherein the reactive polymer (component A) forming the pressure-sensitive adhesive layer is a (meth) acrylic monomer in the main chain. It is a modified (meth) acrylic polymer containing a repeating unit derived from and having a functional group containing a (meth) acryloyl skeleton and a functional group containing an alkoxysilyl skeleton in the side chain.

  The antireflection film having ultraviolet absorptivity according to the third invention is the anti-reflection film according to the first or second invention, wherein the monomer (component C) having a polymerizable double bond forming the pressure-sensitive adhesive layer is tetrahydrofurfuryl. An acrylate (C-1 component) and 4-hydroxybutyl acrylate (C-2 component) are contained, A component is 5-30 mass% with respect to the total amount of the said A component and C component, and C component is 70-95. It is characterized by containing mass%.

  In the antireflection film having ultraviolet absorption properties according to the fourth invention, in the second or third invention, the glass transition temperature (Tg) of the modified (meth) acrylic polymer is −5 to −55 ° C. It is characterized by.

  The method for producing an antireflection film having ultraviolet absorptivity according to the fifth invention is the method for producing an antireflection film according to the first invention, wherein the ultraviolet curable pressure-sensitive adhesive composition is applied onto a release film. After curing the ultraviolet curable pressure-sensitive adhesive composition by irradiating with active energy rays, the surface opposite to the release film is reflected on the transparent substrate film on which the hard coat layer and the antireflection layer are laminated. It is characterized by being bonded to the surface opposite to the prevention layer.

According to the present invention, the following effects can be exhibited.
In the antireflective film having ultraviolet absorptivity according to the first invention, the pressure-sensitive adhesive layer can exhibit ultraviolet absorptivity because the pressure-sensitive adhesive layer contains the ultraviolet absorber. Moreover, since the mass average molecular weight (MW) of the reactive polymer (component A) forming the pressure-sensitive adhesive layer is in an appropriate range of 50,000 to 800,000, it is miscible with the monomer having a polymerizable double bond. It is good and can exhibit good adhesiveness and its durability. Furthermore, since the absorbance of the pressure-sensitive adhesive layer at a light wavelength of 380 nm is set to 1.3 to 2.7 by the ultraviolet absorber (D component), it is possible to effectively suppress the transmission of ultraviolet rays, and consequently the reflection. The characteristic as a prevention film can be maintained. In addition, the antireflection layer exhibits a function of suppressing light reflection. Therefore, the antireflection film can exhibit excellent ultraviolet absorptivity, can suppress light reflection, and can improve durability. Therefore, this antireflection film can be suitably used for an electronic display panel such as a plasma display.

  In the second invention, the reactive polymer (component A) forming the pressure-sensitive adhesive layer contains a repeating unit derived from a (meth) acrylic monomer in the main chain, and a (meth) acryloyl skeleton in the side chain. And a modified (meth) acrylic polymer having a functional group containing an alkoxysilyl skeleton. For this reason, in addition to the effect of 1st invention, since the repeating unit of the (meth) acrylic-type monomer is included in the said principal chain, it was excellent in weather resistance, optical properties (translucency, transparency, etc.) ) And a side chain contains a (meth) acryloyl-based functional group, so that the weather resistance is high and the adhesive residue at the time of peeling is small. Furthermore, since an alkoxysilyl-based functional group is contained in the side chain, adhesion, heat resistance, and moist heat resistance can be improved when glass is used as the adherend.

  In 3rd invention, the monomer (C component) which has a polymerizable double bond which forms an adhesive layer is tetrahydrofurfuryl acrylate (C-1 component) and 4-hydroxybutyl acrylate (C-2 component). 5 to 30% by mass of the A component and 70 to 95% by mass of the C component with respect to the total amount of the A component and the C component. For this reason, in addition to the effect of 1st or 2nd invention, the improvement of the applicability | paintability of an adhesive composition and the adhesive force with respect to a to-be-adhered body can be aimed at.

  In the fourth invention, the glass transition temperature (Tg) of the modified (meth) acrylic polymer is -5 to -55 ° C. Therefore, in addition to the effects of the second or third invention, suitable adhesive properties (adhesion strength, non-contamination, etc.) can be imparted to the adhesive layer.

  According to a fifth aspect of the present invention, there is provided a method for producing an antireflection film having ultraviolet absorptivity, wherein an ultraviolet curable pressure-sensitive adhesive composition is coated on a release film and irradiated with active energy rays to thereby radiate an ultraviolet ray-curable adhesive composition. After curing, the surface opposite to the release film is bonded to the surface opposite to the antireflection layer of the transparent substrate film on which the hard coat layer and the antireflection layer are laminated. For this reason, the pressure-sensitive adhesive composition can be quickly cured by irradiation with active energy rays, and a large-sized dryer that is necessary for a conventional room-temperature-curing pressure-sensitive adhesive is not necessary, and the effect of the first invention is achieved. The antireflection film can be easily produced without affecting the hard coat layer and the antireflection layer.

Hereinafter, embodiments that are considered to be the best modes of the present invention will be described in detail.
As shown in FIG. 1, an antireflection (decrease-reflective) film 1 having ultraviolet absorptivity according to this embodiment is laminated on a transparent base film 2 in the order of a hard coat layer 3 and an antireflection layer 4. The pressure-sensitive adhesive layer 5 is provided on the transparent base film 2 on the side opposite to the side on which 4 is provided. Here, the adhesive layer 5 means an adhesive / adhesive layer formed of an adhesive / adhesive having both the performance of an adhesive and an adhesive in this specification. In addition, the release film 6 is provided on the adhesive layer 5, and this release film 6 is peeled off and the antireflection film 1 is adhered to the adherend.

  The pressure-sensitive adhesive layer 5 contains a reactive polymer (component A), a photopolymerization initiator (component B), a monomer having a polymerizable double bond (component C), and an ultraviolet absorber (component D). An ultraviolet curable pressure-sensitive adhesive composition (hereinafter also simply referred to as a pressure-sensitive adhesive composition) is irradiated with ultraviolet rays and cured to exhibit an ultraviolet absorbing function. The mass (weight) average molecular weight (MW) of the reactive polymer as component A is set to 50,000 to 800,000, improving the miscibility with the monomer having a polymerizable double bond and improving the adhesive function. Can be made. Further, the absorbance of the pressure-sensitive adhesive layer 5 at a light wavelength of 380 nm is set to 1.3 to 2.7 by the ultraviolet absorber which is the D component, and can exhibit an ultraviolet transmission suppression function. The function of maintaining the characteristics can be exhibited.

  First, the transparent substrate film 2 will be described. The transparent substrate film 2 is not particularly limited as long as it has transparency. However, in order to suppress reflection, the refractive index (n) is 1.55 to 1.70. Those within the range are preferred. Examples of the transparent base film include polyesters such as polyethylene terephthalate (PET, n = 1.65), polycarbonate (PC, n = 1.59), polyarylate (PAR, n = 1.60), and polyether sulfone. (PES, n = 1.65) and the like are preferable. Among these, a polyester film, particularly a polyethylene terephthalate film is preferable in terms of ease of molding, availability, and cost.

  Moreover, the thickness of the transparent base film 2 is preferably 25 to 400 μm, more preferably 50 to 200 μm. In addition, the transparent substrate film 2 may contain various additives. Examples of such additives include stabilizers, plasticizers, lubricants, flame retardants, and the like.

Next, the hard coat layer 3 will be described.
The hard coat layer 3 is not particularly limited, and is generally formed by curing a curable composition containing an ultraviolet curable resin, a photopolymerization initiator, and the like. The ultraviolet curable resin, which is the main component of the curable composition, is a component (compound) capable of forming a cured product by causing a curing reaction upon irradiation with ultraviolet rays, and the type thereof is not particularly limited. The ultraviolet curable resin is a concept including a monomer, oligomer, polymer, or a mixture thereof having an ultraviolet curable functional group. Specifically, as the ultraviolet curable resin, monofunctional (meth) acrylate [in the present specification, (meth) acrylate means a generic name including both acrylate and methacrylate. ], Polyfunctional (meth) acrylates and the like are preferable. Among these, a composition containing an ultraviolet curable polyfunctional acrylate as a main component is more preferable from the viewpoint of achieving both productivity and hardness. Examples of such a composition containing an ultraviolet curable polyfunctional acrylate include a mixture of two or more known ultraviolet curable polyfunctional acrylates and a commercially available ultraviolet curable hard coat material.

  Examples of the ultraviolet curable polyfunctional acrylate include dipentaerythritol hexaacrylate, tetramethylol methane tetraacrylate, tetramethylol methane triacrylate, trimethylol propane triacrylate, 1,6-hexanediol diacrylate, 1,6-bis ( Acrylic derivatives of polyfunctional alcohols such as 3-acryloyloxy-2-hydroxypropyloxy) hexane, polyethylene glycol diacrylate, and urethane acrylates having various modifications or having various molecular weights are preferable.

  The photopolymerization initiator is a polymerization initiator that can exhibit photopolymerization initiating ability by light in the ultraviolet region and can cure the ultraviolet curable resin. Examples of such photopolymerization initiator include 1-hydroxy-cyclohexyl-phenyl-ketone, 2-hydroxy-2-methyl-1-phenyl-propan-1-one, and 1- [4- (2-hydroxyethoxy) -phenyl. ] -2-Hydroxy-2-methyl-1-propan-1-one, 2-methyl-1- [4- (methylthio) phenyl] -2-morpholinopropan-1-one, 2-benzyl-2-dimethyl Examples include amino-1- (4-morpholinophenyl) -butanone-1, bis (2,4,6-trimethylbenzoyl) -phenylphosphine oxide, 2,4,6 trimethylbenzoyl-diphenyl-phosphine oxide, and the like. .

  Content of a photoinitiator is 10 mass parts or less normally with respect to 100 mass parts of said ultraviolet curable resins, Preferably it is 1-5 mass parts. When the content of the photopolymerization initiator is more than 10 parts by mass, the photopolymerization initiator that has not been used for initiating the photopolymerization may remain, which may cause adverse effects such as a decrease in visible light transmittance. On the other hand, when the amount is less than 1 part by mass, the photopolymerization initiating ability is not sufficiently exhibited, and the curing of the ultraviolet curable resin tends to be insufficient.

  In addition to the above compounds, the curable composition may contain other components as long as the effects of the present invention are not impaired. The other components are not particularly limited, and for example, additives such as inorganic or organic antistatic agents, inorganic or organic near-infrared absorbers, ultraviolet absorbers, antioxidants, dispersants, surfactants, leveling agents, etc. Can be mentioned. Further, any amount of solvent can be added as long as it is dried after film formation by the wet coating method.

  The formation method of the hard-coat layer 3 is not specifically limited, For example, methods, such as a dry coating method and a wet coating method, are employ | adopted. Among these methods, the wet coating method is particularly preferable in terms of productivity and production cost. The wet coating method may be a known method, and for example, a roll coating method, a spin coating method, a coil bar method, a dip coating method, etc. are representative methods. In these, the method which can form the hard-coat layer 3 continuously, such as a roll coat method, is preferable from the point of productivity and production cost.

Next, the antireflection layer 4 will be described.
The antireflection layer 4 can have a single layer structure or a multilayer structure. In the case of a single layer configuration, one layer having a refractive index lower than that of the hard coat layer 3 (low refractive index layer) is formed on the hard coat layer 3. In the case of a multilayer structure, layers having different refractive indexes are laminated on the hard coat layer 3 in a multilayer form. By adopting a multilayer structure, the reflectance can be lowered more effectively. Specifically, the antireflection layer 4 has a two-layer configuration including a high refractive index layer and a low refractive index layer in order as viewed from the hard coat layer 3 side, a medium refractive index layer, a high refractive index layer, and a low refractive index layer. Or a four-layer configuration including a high refractive index layer, a low refractive index layer, a high refractive index layer, and a low refractive index layer. From the viewpoint of the antireflection effect, a structure of three or more layers is preferable, and from the viewpoint of productivity and production cost, a single-layer structure or a two-layer structure is preferable.

  The method for forming the antireflection layer 4 is not particularly limited, and for example, a dry coating method, a wet coating method, or the like is employed. Among these methods, the wet coating method is particularly preferable in terms of productivity and production cost. The wet coating method may be a known method, and for example, a roll coating method, a spin coating method, a coil bar method, a dip coating method, etc. are representative methods. Among these, a method capable of continuously forming the antireflection layer 4 such as a roll coating method is preferable from the viewpoint of productivity and production cost. In order to make the function of the antireflection layer 4 manifest, the refractive index of the low refractive index layer requires that the formed layer has a lower refractive index than the layer immediately below, and the refractive index is 1.20. It is preferable to be in the range of ~ 1.55. When the refractive index exceeds 1.55, it is difficult to obtain a sufficient antireflection effect by the wet coating method, whereas when it is less than 1.20, it tends to be difficult to form a sufficiently hard layer. .

  Furthermore, in the case of a two-layer structure, the refractive index of the high refractive index layer needs to be higher than that of the low refractive index layer formed immediately above, so that the refractive index is 1.65 to 1.90. It is preferable to be within the range. If the refractive index is less than 1.65, it is difficult to obtain a sufficient antireflection effect, and it tends to be difficult to form a layer exceeding 1.90 by the wet coating method. Further, in the case of a multilayer structure provided with a middle refractive index layer, any layer having a refractive index lower than that of the high refractive index layer to be laminated and higher in refractive index than that of the low refractive index layer may be used. Not.

The thickness of the antireflection layer 4 varies depending on the type and shape of the transparent base film 2 and the configuration of the antireflection layer 4, but a thickness equal to or less than the wavelength of visible light per layer is preferable. For example, when the effect of reducing reflection with respect to visible light is expressed, the optical film thickness n _H · d of the high refractive index layer is 500 ≦ 4 n _H · d (nm) ≦ 750, and the optical film of the low refractive index layer The thickness n _L · d is designed to satisfy 400 ≦ 4n _L · d (nm) ≦ 650. Here, n _H and n _L are the refractive indexes of the high refractive index layer and the low refractive index layer, respectively, and d is the thickness of the layer.

  The material constituting the high refractive index layer is not particularly limited, and an inorganic material or an organic material can be used. Specific examples of the inorganic material include zinc oxide, titanium oxide, cerium oxide (refractive index 2.30), tin oxide, aluminum oxide, silane oxide (refractive index 1.90), zirconium oxide, and indium tin oxide (refractive index 2). .00) and the like. As the organic material, specifically, a high refractive index organic monomer or polymer containing a thiol group or phenyl group having a refractive index of 1.60 to 1.80 can be used.

  The high refractive index layer containing fine particles of the inorganic material can use an organic monomer or a polymer as a binder during wet coating. The average particle diameter of the fine particles of the inorganic material preferably does not greatly exceed the thickness of the layer, and is particularly preferably 0.1 μm or less. When the average particle size of the fine particles is increased, scattering is caused and the optical function of the high refractive index layer is deteriorated. Further, the surface of the fine particles can be modified with various coupling agents as required. Examples of such a coupling agent include organically substituted silicon compounds, organic acid salts containing metal alkoxides such as aluminum, titanium, zirconium, and antimony.

  As a material constituting the low refractive index layer, for example, inorganic fine particles such as hollow silicon oxide, colloidal silicon oxide, lanthanum fluoride, and magnesium fluoride, organic polymer fine particles, or a simple substance or a mixture of a fluorine-containing organic compound is used. be able to. In addition, a simple substance, a mixture, or a polymer of an organic compound not containing fluorine (hereinafter abbreviated as a non-fluorine organic compound) can be used as the binder resin.

  The average particle diameter of the inorganic fine particles preferably does not greatly exceed the thickness of the low refractive index layer, and is particularly preferably 0.1 μm or less. When the average particle size is increased, the optical performance of the low refractive index layer is deteriorated, such as light scattering. Furthermore, the surface of the fine particles can be modified with various coupling agents as required. An example of such a coupling agent is an organically substituted silicon compound. In particular, a film having high hardness can be formed by modifying the surface with a reactive group such as a (meth) acryloyl group.

  The fluorine-containing organic compound is not particularly limited, but fluorine-containing (meth) acrylate is preferable from the viewpoint of reactivity, and fluorine-containing polyfunctional (meth) acrylate is particularly preferable from the viewpoint of hardness and refractive index. By curing these fluorine-containing organic compounds, a layer having a low refractive index and a high hardness can be formed.

  As the polymer of the above-mentioned fluorine-containing organic compound or the polymer of other fluorine-containing organic compounds, a linear polymer such as a homopolymer of a fluorine-containing organic compound, a copolymer, or a copolymer with a non-fluorine-based organic compound is used. Examples thereof include a polymer, a polymer containing a carbocyclic ring or a heterocyclic ring in the chain, a cyclic polymer, and a comb polymer. A conventionally well-known thing can be used as said non-fluorine-type organic compound, For example, silicon compounds, such as monofunctional or polyfunctional (meth) acrylate, tetraethoxysilane, etc. are mentioned.

  Further, the antireflection layer 4 may contain other components in addition to the above compounds as long as the effects of the present invention are not impaired. Other components are not particularly limited, and for example, inorganic or organic pigments, polymers, polymerization initiators, photopolymerization initiators, polymerization inhibitors, antioxidants, dispersants, surfactants, light stabilizers, leveling An additive such as an agent can be mentioned. Further, any amount of solvent can be added as long as it is dried after film formation by the wet coating method.

  The antireflection layer 4 can be formed by wet coating, and then subjected to a curing reaction by irradiation with active energy rays such as ultraviolet rays and electron beams or heating as necessary. Such a curing reaction using active energy rays is preferably performed in an atmosphere of an inert gas such as nitrogen or argon.

Next, the pressure-sensitive adhesive layer 5 formed from the pressure-sensitive adhesive composition will be described.
The pressure-sensitive adhesive composition forming the pressure-sensitive adhesive layer 5 includes a reactive polymer (component A), a photopolymerization initiator (component B), a monomer having a polymerizable double bond (component C), and an ultraviolet absorber ( D component) as an essential component. Hereinafter, it demonstrates for every component.
[Reactive polymer of component A]
As a reactive polymer, a functional group containing a (meth) acrylic monomer-derived repeating unit in the main chain and a (meth) acryloyl skeleton in the side chain [(meth) acryloyl functional group] and alkoxysilyl A modified (meth) acrylic polymer having a functional group containing a skeleton (alkoxysilyl functional group) is used.
<Main chain of modified (meth) acrylic polymer>
The reactive polymer includes a repeating unit derived from a (meth) acrylic monomer in the main chain (hereinafter, the “repeating unit derived from monomer X” may be simply referred to as “X unit”). . In other words, the modified (meth) acrylic polymer has a (meth) acrylic polymer as a basic skeleton. The reason why the (meth) acrylic monomer unit is contained in the main chain is that it makes it possible to exhibit excellent weather resistance and optical properties (translucency and transparency). In this specification, the term “main chain” means a carbon chain having the largest number of carbon atoms in the modified (meth) acrylic polymer.

  In general, “(meth) acrylic monomer” means acrylic acid, methacrylic acid, or derivatives thereof. Specifically, in addition to acrylic acid and methacrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n-butyl (meth) acrylate, i -Butyl (meth) acrylate, t-butyl (meth) acrylate, n-pentyl (meth) acrylate, i-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (meth) acrylate, 2- (Meth) acrylates such as ethylhexyl (meth) acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 3-hydroxypropyl ( Hydroxy acids such as (meth) acrylate Containing (meth) acrylates; (meth) acrylates such as ammonium (meth) acrylate, sodium (meth) acrylate, potassium (meth) acrylate; (meth) acrylamides such as (meth) acrylamide; Can be mentioned.

  Among the (meth) acrylic monomers, the reactive polymer preferably includes a repeating unit derived from ethyl acrylate, butyl acrylate or 2-ethylhexyl acrylate, and includes a repeating unit derived from ethyl acrylate or butyl acrylate. Are more preferred, and those containing repeating units derived from ethyl acrylate are particularly preferred. This is because by including these repeating units, it is possible to exhibit good adhesive performance.

  In addition, the reactive polymer may be a homopolymer whose main chain includes only one (meth) acrylic monomer unit, or two or more (meth) acrylic monomer units. It may be a copolymer. However, when the pressure-sensitive adhesive composition is used, two or more (meth) acrylic monomer units are included because it is easy to precisely adjust the physical properties of the coating film (pressure-sensitive adhesive layer 5). It is preferable that it is a copolymer containing.

  In addition, as long as the A component contains a (meth) acrylic monomer unit, it is not necessary that all repeating units are (meth) acrylic monomer units. That is, as long as the effect of this invention is not inhibited, you may contain monomer units other than a (meth) acrylic-type monomer.

  The type of “monomer other than (meth) acrylic monomer” is not particularly limited, but a monomer having a polymerizable unsaturated bond can be used. Specifically, aromatic vinyls such as styrene and α-methylstyrene; vinyl carboxylates such as vinyl acetate and vinyl propionate; unsaturated dicarboxylic acids such as maleic anhydride, itaconic acid and fumaric acid; N-vinyl N-vinyl lactams such as pyrrolidone and N-vinylcaprolactam; (meth) acrylonitriles such as (meth) acrylonitrile and the like can be mentioned.

In the (meth) acrylic monomer unit of the reactive polymer, the content of the (meth) acrylic monomer unit is that of the monomer unit constituting the main chain of the modified (meth) acrylic polymer. When the total is 100% by mass, it is preferably 50% by mass or more, more preferably 90% by mass or more, and particularly preferably 100% by mass. That is, it is most preferable that all of the main chain is composed of (meth) acryl monomer units. If the content of the (meth) acrylic monomer unit is less than 50% by mass, the adhesive performance tends to decrease, such being undesirable.
<Side chain of modified (meth) acrylic polymer>
The reactive polymer preferably has a functional group containing a (meth) acryloyl skeleton and a functional group containing an alkoxysilyl skeleton in the side chain. In other words, the (meth) acrylic polymer serving as the basic skeleton is modified by introducing a (meth) acryloyl functional group and an alkoxysilyl functional group by chemical modification. In the present specification, the term “side chain” means a carbon chain branched from the main chain of the modified (meth) acrylic polymer.

  Since the polymer having a (meth) acryloyl functional group (that is, a polymerizable functional group) in the side chain is cross-linked with each other by irradiation with ultraviolet rays, ultraviolet curability is expressed. Moreover, in addition to high weather resistance, when the adhesive layer 5 is peeled off, there is little adhesive residue on the adherend, and a preferable effect of hardly contaminating the adherend is exhibited. On the other hand, a polymer having an alkoxysilyl-based functional group in the side chain is excellent in adhesion and durability, particularly heat resistance and heat and moisture resistance when a glass material is used as an adherend. Specifically, it exhibits excellent adhesion under high temperature conditions or high temperature / high humidity conditions, and has high adhesive performance.

  In the present specification, the term “functional group including a (meth) acryloyl skeleton” means a functional group including “acryloyl skeleton” or “methacryloyl skeleton”, and all or one of hydrogen atoms constituting the acryloyl skeleton or methacryloyl skeleton It also includes substituted derivatives in which the moiety is substituted with other atoms or functional groups. In the present specification, these functional groups may be referred to as “(meth) acryloyl functional groups”. Typical examples include an acryloyl group and a methacryloyl group. An acryloyl group is preferred in that it can impart excellent polymerizability (and hence UV curable properties), and a methacryloyl group is preferred in terms of good handleability compared to an acryloyl group.

  In addition, the (meth) acryloyl functional group does not need to be a functional group having a structure in which the acryloyl skeleton or methacryloyl skeleton can be directly bonded to the main chain. It may be a functional group having a structure that can be bonded to the main chain (for example, an acryloyloxy group).

  The preferred content of the (meth) acryloyl functional group varies depending on the structure of the main chain, the mass average molecular weight, the glass transition temperature, the adhesive physical properties, etc., but is 0.1 to 100 mmol per 100 g of the modified (meth) acrylic polymer. Preferably, it is 0.3 to 50 mmol, more preferably 1 to 40 mmol. For example, a modified (meth) acrylic polymer having a mass average molecular weight of about 300,000 preferably has 0.33 to 330 (meth) acryloyl functional groups per polymer molecule. Those having 0.0 to 165 are more preferred, and those having 3.3 to 132 are particularly preferred.

  When the content is less than 0.1 mmol / 100 g, the modification effect by the (meth) acryloyl functional group (specifically, UV curability, high weather resistance, less adhesive residue on the adherend, etc.) (Effect) may not be obtained sufficiently. On the other hand, when the amount is more than 100 mmol / 100 g, although it varies depending on the polymer composition and the like, it tends to cause high viscosity and accompanying coating failure.

  In the present specification, the term “alkoxysilyl skeleton” means a skeleton in which at least one alkoxy group is bonded to a silicon atom. Therefore, the “functional group containing an alkoxysilyl skeleton” includes a functional group in which a silicon atom is bonded to a functional group other than an alkoxy group in addition to an alkoxy group. In the present specification, these functional groups may be referred to as “alkoxysilyl functional groups”. Specific examples of the alkoxysilyl functional group include a trialkoxysilyl group, a dialkoxysilyl group, and a monoalkoxysilyl group. Among these, trialkoxysilyl groups are particularly preferable because they can be introduced using trialkoxysilane derivatives that are relatively easily available. The alkoxysilyl functional group does not need to be a functional group having a structure in which the alkoxysilyl skeleton can be directly bonded to the main chain, and the structure in which the alkoxysilyl skeleton can be indirectly bonded through any atom or functional group. (For example, a trialkoxysilylalkyl group).

  The preferred content of the alkoxysilyl functional group varies depending on the structure of the main chain, the mass average molecular weight, the glass transition temperature, etc., but is preferably 0.1 to 100 mmol per 100 g of the modified (meth) acrylic polymer, More preferably, it is 0.3-50 mmol, and it is especially preferable that it is 1-40 mmol. For example, in the case of a modified (meth) acrylic polymer having a mass average molecular weight of 300,000, those having 0.33 to 330 alkoxysilyl functional groups per polymer molecule are preferable. Those having 165 are more preferred, and those having 3.3 to 132 are particularly preferred.

When the content is less than 0.1 mmol / 100 g, the modification effect by the alkoxysilyl-based functional group (specifically, durability when a glass material is used as the adherend, in particular, excellent heat resistance and wet heat resistance) Etc.) may not be sufficiently obtained. On the other hand, when it is more than 100 mmol / 100 g, although it varies depending on the polymer composition and the like, it tends to cause high viscosity and accompanying coating failure.
<Mass average molecular weight of modified (meth) acrylic polymer>
In the present specification, the term “mass average molecular weight” means a mass average molecular weight in terms of polystyrene measured by GPC-LS method (Gel Permeation Chromatography-Light Scattering Method: GPC-light scattering method). The weight average molecular weight (Mw) of the modified (meth) acrylic polymer forming the reactive polymer is 50,000 to 800,000, preferably 100,000 to 800,000. By setting the mass average molecular weight in the range of 50,000 to 800,000, the miscibility with the monomer of component C is good and the composition becomes uniform, and the adhesive layer 5 has good adhesiveness and its Sustainability can be expressed and less adhesive remains on the adherend, making it difficult to contaminate the adherend. When the mass average molecular weight is less than 50,000, the adhesive residue on the adherend increases when the pressure-sensitive adhesive composition is formed, resulting in the result of contaminating the adherend. On the other hand, if it exceeds 800,000, the miscibility with the monomer becomes poor and the adhesiveness of the pressure-sensitive adhesive layer 5 cannot be exhibited.

The weight average molecular weight is a polymerization condition when polymerizing the (meth) acrylic polymer to be the main chain, for example, the type and amount of the polymerization initiator, the type and amount of the chain transfer agent, the type and amount of the solvent, the reaction temperature, By appropriately controlling the reaction time and the like, it can be adjusted within the above range. Moreover, you may select suitably what has a desired mass mean molecular weight from commercially available (meth) acrylic-type polymers, and you may use this for modification | denaturation.
[Glass transition temperature (Tg) of modified (meth) acrylic polymer]
In the present specification, “glass transition temperature” means a glass transition temperature measured in accordance with JIS K7121 (plastic transition temperature measurement method). The reactive polymer as component A preferably has a glass transition temperature (Tg) of -5 to -55 ° C. By setting the glass transition temperature within this range, good pressure-sensitive adhesive performance can be exhibited when the pressure-sensitive adhesive composition is prepared. When the glass transition temperature is higher than −5 ° C., the pressure-sensitive adhesive strength tends to decrease when the pressure-sensitive adhesive composition is prepared. On the other hand, when it becomes lower than −55 ° C., the adhesive residue on the adherend increases when the pressure-sensitive adhesive composition is prepared, and the adherend tends to be contaminated.
<Method for producing modified (meth) acrylic polymer>
Although the manufacturing method of a reactive polymer is not specifically limited, For example, the method of introduce | transducing a (meth) acryloyl type functional group and an alkoxy silyl type functional group by chemical modification with respect to the (meth) acrylic-type polymer used as a basic skeleton ( (Chemical modification method). Specific examples of the chemical modification method include, for example, a (meth) acrylic polymer having a hydroxyl group as a base polymer, and a (meth) acrylic compound having an isocyanate group or an alkoxy having an isocyanate group at the hydroxyl group of the base polymer. A method of introducing a (meth) acryloyl functional group and an alkoxysilyl functional group by directly bonding a silane compound can be exemplified (direct bonding method).

  The “(meth) acrylic polymer having a hydroxyl group” is obtained by copolymerizing a hydroxyl group-containing (meth) acrylic acid ester such as 2-hydroxyethyl acrylate with another (meth) acrylic monomer. Can do. Examples of the “(meth) acrylic compound having an isocyanate group” include 2-methacryloyloxyethyl isocyanate [trade name: Karenz MOI manufactured by Showa Denko KK] and 2-acryloyloxyethyl isocyanate [manufactured by Showa Denko KK]. Product name: Karenz AOI]. On the other hand, examples of the alkoxysilane compound having an isocyanate group include 3-isocyanatopropyltriethoxysilane.

  As a chemical modification method, a polyfunctional compound such as a polyisocyanate compound is bonded to a hydroxyl group of a base polymer, and a (meth) acrylic compound having a hydroxyl group or an alkoxy having a hydroxyl group through the polyfunctional compound is used. A method of introducing a (meth) acryloyl functional group and an alkoxysilyl functional group by indirectly bonding a silane compound may be employed (indirect bonding method).

  Examples of the “polyisocyanate compound” include methylene diphenyl diisocyanate (MDI), tolylene diisocyanate (TDI), isophorone diisocyanate (IPDI), and the like. Examples of the “(meth) acrylic compound having a hydroxyl group” include the hydroxyl group-containing (meth) acrylates already described. Examples of the “alkoxysilane compound having a hydroxyl group” include 3-hydroxypropyltriethoxysilane.

  In addition, as a method for producing a reactive polymer, an alkoxysilyl functional group is incorporated into a base polymer skeleton by copolymerizing a monomer having an alkoxysilyl functional group with another monomer. The (meth) acryloyl functional group may be introduced by chemical modification to the base polymer (polymerization method). This polymerization method will be described more specifically. A monomer mixture containing a (meth) acrylic monomer, a monomer having a hydroxyl group and a monomer having an alkoxysilyl functional group is subjected to a polymerization reaction, A first modified (meth) acrylic polymer having the alkoxysilyl functional group and hydroxyl group in the chain is obtained, and the first modified (meth) acrylic polymer is used as a base polymer. This is a method for obtaining a second modified (meth) acrylic polymer by introducing a (meth) acryloyl functional group into a hydroxyl group by chemical modification.

  Examples of the “monomer having an alkoxysilyl-based functional group” include methacryloyloxytrialkoxysilane, acryloyloxytrialkoxysilane, and vinyltrialkoxysilane. Among these, methacryloyloxytrialkoxysilane or acryloyloxytrialkoxysilane is preferably used, and acryloyloxytrialkoxysilane is particularly preferably used in terms of high reactivity during polymerization.

The preferred content of the reactive polymer varies depending on the structure of the reactive polymer, the type of photopolymerization initiator that is the B component, the type of adherend, the required adhesive properties, etc., but the A component and the C component The total amount is preferably 5 to 30% by mass, more preferably 10 to 25% by mass, and particularly preferably 10 to 20% by mass. When the content is less than 5% by mass, the adhesive strength of the pressure-sensitive adhesive layer 5 tends to decrease, which is not preferable. On the other hand, when the amount is more than 30 parts by mass, the miscibility with the monomer tends to decrease when the C component and other monomers are used.
(Photopolymerization initiator as component B)
The photopolymerization initiator as the component B means an additive exhibiting a catalytic action that induces a polymerization reaction by light irradiation when added to a polymerization system. This photopolymerization initiator has an absorption region at a light wavelength of 220 to 450 nm, and can exhibit its function by irradiation with ultraviolet light having a light wavelength of 200 to 450 nm. The photopolymerization initiator is not particularly limited and is selected according to a conventional method.

  Examples of the photopolymerization initiator include α-hydroxyacetophenone (trade name Irgacure 184, manufactured by Ciba Specialty Chemicals Co., Ltd.), α-aminoacetophenone, benzoin compounds, and acylphosphine oxide compounds (for example, Ciba Specialty Chemicals Co., Ltd.). Photopolymerization initiators such as trade name Irgacure 819, manufactured by BASF, trade name Lucirin TPO). Of these, α-hydroxyacetophenone, α-aminoacetophenone and acylphosphine oxide compounds are preferred, and α-hydroxyacetophenone and acylphosphine oxide compounds are particularly preferred because of their high reactivity.

The preferred content of the photopolymerization initiator varies depending on the structure of the reactive polymer as component A, the type of photopolymerization initiator as component B, the type of adherend, the required adhesive properties, etc. And when the total amount of component C is 100 parts by mass, it is preferably 0.5 to 25 parts by mass, more preferably 1 to 20 parts by mass, and 2.5 to 15 parts by mass. Is particularly preferred. When the content is less than 0.5 parts by mass, the action as a photopolymerization initiator may not be sufficiently exhibited. On the other hand, when it is more than 25 parts by mass, the performance as a pressure-sensitive adhesive tends to decrease due to the remaining photopolymerization initiator.
(Monomer having a polymerizable double bond as component C)
By containing a monomer having a polymerizable double bond as component C, it is preferable that adhesion to an adherend and durability during use are improved and coating of the pressure-sensitive adhesive composition is facilitated. The effect is demonstrated. This C component is not particularly limited as long as it is a monomer having a polymerizable double bond such as a vinyl group, and therefore has the required performance (adhesive strength, transparency, color, etc.) as an adhesive composition. What is necessary is just to select suitably according to. However, the component C is preferably a liquid and low viscosity monomer. Further, since the pressure-sensitive adhesive composition is an ultraviolet curable type, a monomer having ultraviolet curable properties is used.

  Examples of the ultraviolet curable monomer include, in addition to acrylic acid and methacrylic acid, methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, i-propyl (meth) acrylate, n- Butyl (meth) acrylate, i-butyl (meth) acrylate, t-butyl (meth) acrylate, n-pentyl (meth) acrylate, i-pentyl (meth) acrylate, n-hexyl (meth) acrylate, n-octyl (Meth) acrylates such as (meth) acrylate, 2-ethylhexyl (meth) acrylate, lauryl (meth) acrylate, cyclohexyl (meth) acrylate; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) Acrylate, 3-hydroxypropy Hydroxyl-containing (meth) acrylates such as (meth) acrylate, tetrahydrofurfuryl acrylate, 4-hydroxybutyl acrylate; 1,6-hexanediol diacrylate, 1,9-nonanediol diacrylate, pentaerythritol triacrylate, pentaerythritol Polyfunctional acrylates such as tetraacrylate, dipentaerythritol pentaacrylate, dipentaerythritol hexaacrylate; vinyl carboxylates such as vinyl acetate and vinyl propionate; aromatic vinyls such as styrene and α-methylstyrene; be able to.

  Examples of the ultraviolet curable oligomer include a (meth) acryloyl group, a monofunctional, bifunctional or polyfunctional epoxy acrylate oligomer, urethane acrylate oligomer, polyester acrylate oligomer, polyether acrylate oligomer, polyvinyl alcohol. And oligomers such as silicone oligomers and silicone acrylate oligomers. These can be used alone or in combination of two or more.

  The epoxy acrylate oligomer includes diglycidyl ether diacrylate of bisphenol A, a reaction product of epoxy resin, acrylic acid and methyltetrahydrophthalic anhydride, a reaction product of epoxy resin and 2-hydroxyethyl acrylate, epoxy resin, Examples include reaction products with acrylic acid. Examples of the urethane acrylate oligomer include oligomers in which a polyoxyalkylene segment, a saturated polyester segment, a saturated polyether segment or both are bonded via a urethane bond, and an acryloyl group or a methacryloyl group is present at both ends. Polyester acrylate oligomers are ring-opening copolymerized ester of glycidyl diacrylate and phthalic anhydride, ester of methacrylic acid dimer and polyol, polyester obtained from acrylic acid, phthalic anhydride and propylene oxide, polyethylene glycol and anhydrous Examples thereof include oligomers such as a reaction product of maleic acid and glycidyl methacrylate.

  The polyether acrylate oligomer is a reaction product of a polyol such as trimethylolpropane or pentaerythritol, an alkylene oxide such as ethylene oxide or propylene oxide, and (meth) acrylic acid, a methyl vinyl ether maleic anhydride copolymer and 2 -A reaction product with hydroxyethyl acrylate or an oligomer such as a product obtained by further reacting this with glycidyl methacrylate. Examples of the polyvinyl alcohol oligomer include a reaction product of polyvinyl alcohol and N-methylol acrylamide, an oligomer obtained by esterifying polyvinyl alcohol with succinic anhydride and then adding glycidyl methacrylate. Examples of the silicone acrylate oligomer include an oligomer having an acryloyl group or a methacryloyl group at both ends of the silicone via a urethane bond.

  Examples of UV curable oligomers include polytetramethylene glycol diacrylate, polytetramethylene glycol triacrylate, poly castor oil-based polyol diacrylate, poly castor oil-based polyol triacrylate, trimethylolpropane ethylene oxide modified triacrylate, trimethylolpropane propylene. Oxide modified triacrylate, pentaerythritol triacrylate, dipentaerythritol hexa (penta) acrylate, phenol ethylene oxide modified acrylate, polypropylene glycol diacrylate, bisphenol A ethylene oxide modified diacrylate, acrylate of caprolactone modified dipentaerythritol, caprolactone modified tetrahydroful Frills , Caprolactone-modified hydroxypivalic acid neopentyl glycol ester diacrylate, neopentyl glycol hydroxypivalate ester diacrylate, 2-propenoic acid [2- [1,1-dimethyl-2-[(1-oxo-2 -Propenyl) oxy] ethyl] -5-ethyl-1,3-dioxane-5-yl] methyl ester, phthalic anhydride-2-hydroxyethyl acrylate adduct, and the like.

  Among these, what contains tetrahydrofurfuryl acrylate (C-1 component) and 4-hydroxybutyl acrylate (C-2 component) of hydroxyl-containing acrylates as the monomer of the C component is preferable. By containing C-1 component, while the viscosity of an adhesive composition falls and coatability improves, the adhesiveness of the adhesive layer 5 with respect to a to-be-adhered body can be improved. On the other hand, the adhesiveness and durability of the pressure-sensitive adhesive layer 5 to the adherend can be improved by containing the C-2 component.

  The preferred content of component C varies depending on the structure of the reactive polymer of component A, the type of component B, the type of adherend, the required adhesive properties, etc., but with respect to the total amount of component A and component C 70 to 95% by mass, more preferably 75 to 90% by mass, and particularly preferably 80 to 90% by mass. When the content is less than 70% by mass, the miscibility with the component A tends to decrease. On the other hand, when the amount is more than 95 parts by mass, there is a tendency that the adhesive force of the adhesive layer 5 is reduced.

  The content of the C-1 component is preferably 45 to 94% by mass, more preferably 55 to 90% by mass, and 60 to 80% by mass with respect to the total amount of the A component and the C component. It is particularly preferred. When the content is less than 45% by mass, the miscibility with the component A tends to decrease. On the other hand, when it exceeds 94 mass parts, there exists a tendency which produces the malfunction that adhesive force falls.

The content of the C-2 component is preferably 1 to 50% by mass, more preferably 2.5 to 30% by mass, and more preferably 5 to 20% by mass with respect to the total amount of the A component and the C component. It is particularly preferred that When the content is less than 1% by mass, adhesive residue is generated on the adherend when the pressure-sensitive adhesive layer 5 is peeled off from the adherend such as a glass material, and the adherend tends to be contaminated. On the other hand, when it is more than 50 parts by mass, there is a tendency to cause a problem that the adhesive strength is reduced.
(Ultraviolet absorber as D component)
The ultraviolet absorber is added for the purpose of protecting a substance from chemical action (oxidation, modification, decomposition) by ultraviolet rays, and the ultraviolet absorber absorbs light in the ultraviolet region having a light wavelength of 380 nm or less. Examples of such ultraviolet absorbers include organic ultraviolet absorbers such as benzophenone compounds and benzotriazole compounds, salicylic acid esters, triazine compounds, and cyanoacrylate compounds; inorganic ultraviolet absorbers such as zinc oxide and titanium oxide. Agents; and the like. Of these, at least one ultraviolet absorber selected from the group of benzotriazole compounds and benzophenone compounds is preferable.

  The “benzotriazole-based compound” is a compound having a benzotriazole skeleton represented by the following chemical formulas (1) to (3). That is, as long as a part of the structure has a benzotriazole skeleton represented by the following chemical formulas (1) to (3), it is included in the “benzotriazole-based compound” regardless of the structure of other parts. Examples of benzotriazole compounds include substituted derivatives of benzotriazole, that is, 2- (3-tert-butyl-2-hydroxy-5-methylphenyl) -5-cyclo-2H-benzotriazole (manufactured by Ciba Specialty Chemicals). Trade name Tinuvin 326) and the like.

また、「ベンゾフェノン系化合物」とは、下記化学式（４）に示されるベンゾフェノン骨格を有する化合物である。即ち、その構造の一部に、下記式（４）に示されるベンゾフェノン骨格を有する限り、他の部分の構造に拘らず、「ベンゾフェノン系化合物」に含まれる。ベンゾフェノン系化合物として例えば、ベンゾフェノンの置換誘導体、即ち２，２’，４，４’−テトラヒドロキシベンゾフェノン〔大和化成（株）製の商品名ダインソーブＰ−６〕、２，２’−ジヒドロキシ−４，４’−ジメトキシベンゾフェノン〔シプロ化成（株）製の商品名シーソーブ１０７〕等を挙げることができる。

The “benzophenone compound” is a compound having a benzophenone skeleton represented by the following chemical formula (4). That is, as long as a part of the structure has a benzophenone skeleton represented by the following formula (4), it is included in the “benzophenone compound” regardless of the structure of other parts. Examples of benzophenone compounds include substituted derivatives of benzophenone, that is, 2,2 ′, 4,4′-tetrahydroxybenzophenone [trade name Dynesorb P-6 manufactured by Daiwa Kasei Co., Ltd.], 2,2′-dihydroxy-4, Examples thereof include 4′-dimethoxybenzophenone [trade name Seasorb 107 manufactured by Cypro Kasei Co., Ltd.].

Ｄ成分としては、前記の化合物の１種のみを含有するものであってもよいし、２種以上を含有するものであってもよい。また、Ｄ成分は、ベンゾフェノン系化合物、ベンゾトリアゾール系化合物以外の紫外線吸収剤が含有されていてもよい。粘着剤層５にこの紫外線吸収剤を含有することにより、粘着剤層５の波長３８０ｎｍにおける吸光度を１．３〜２．７の範囲に設定することができる。吸光度をこの範囲に設定することにより、反射防止フィルム１について光の波長３８０ｎｍにおける透過率（紫外線透過率）を５％以下に抑えることができる。従って、この反射防止フィルム１を大型フラットディスプレイパネル、特にプラズマディスプレイパネルに好適に用いることができる。プラズマディスプレイパネルには、色再現性を高めるための有機系色素を用いた色調補正が施されており、係る有機系色素は紫外線に弱いため、紫外線透過抑制機能が必要である。

The component D may contain only one kind of the above-mentioned compounds, or may contain two or more kinds. Further, the component D may contain an ultraviolet absorber other than the benzophenone compound and the benzotriazole compound. By containing this ultraviolet absorber in the pressure-sensitive adhesive layer 5, the absorbance at a wavelength of 380 nm of the pressure-sensitive adhesive layer 5 can be set in a range of 1.3 to 2.7. By setting the absorbance within this range, the light transmittance (ultraviolet light transmittance) of the antireflection film 1 at a wavelength of 380 nm can be suppressed to 5% or less. Therefore, the antireflection film 1 can be suitably used for a large flat display panel, particularly a plasma display panel. The plasma display panel is subjected to color tone correction using an organic dye for enhancing color reproducibility. Since the organic dye is weak against ultraviolet rays, an ultraviolet transmission suppression function is required.

  When the absorbance is lower than 1.3, the ultraviolet absorption of the pressure-sensitive adhesive layer 5 is lowered, and harmful effects due to ultraviolet rays occur, resulting in insufficient durability of the antireflection film 1. On the other hand, when the absorbance is higher than 2.7, the content of the ultraviolet absorber is large, the ultraviolet curable property of the adhesive composition is lowered, the adhesive strength of the adhesive layer 5 is insufficient, and the transparent substrate film 2 and the adhesion of the pressure-sensitive adhesive layer 5 to the adherend and its durability are lacking.

  In order to set the absorbance at a wavelength of 380 nm of the pressure-sensitive adhesive layer 5 to a range of 1.3 to 2.7, the content of the ultraviolet absorber is 5 parts by mass with respect to 100 parts by mass of the total amount of the A component and the C component. It is preferable that it is below, and it is still more preferable that it is 1-5 mass parts. When the content of the ultraviolet absorber is more than 5 parts by mass, the ultraviolet curable property of the pressure-sensitive adhesive composition is inhibited, and the pressure-sensitive adhesive force of the pressure-sensitive adhesive layer 5 tends to be insufficient. On the other hand, when the amount is less than 1 part by mass, the ultraviolet absorptivity of the pressure-sensitive adhesive layer 5 decreases.

  It should be noted that the content of the ultraviolet absorbent as component D is such that the molar absorption coefficient of the ultraviolet absorbent at a wavelength of 380 nm is ε, the molar concentration of the ultraviolet absorbent in the adhesive composition is c, and the thickness of the adhesive layer 5 is When it is set to 1, it is preferable to mix | blend so that a following formula may be satisfy | filled.

1.3 ≦ ε × c × l ≦ 2.7
(Other additives as E component)
In addition to the above components, the pressure-sensitive adhesive composition includes a tackifier, an anti-aging agent, a colorant, a light stabilizer, a coupling agent, a thermal polymerization inhibitor, a leveling agent, a surfactant, a storage stabilizer, and a plasticizer. Additives generally blended into the pressure-sensitive adhesive composition such as a filler may be blended.

  Examples of the tackifier include rosin [trade name Neotol 101K manufactured by Harima Chemical Co., Ltd.], hydrogenated rosin [trade name Pine Crystal KE-100 manufactured by Arakawa Chemical Industries, Ltd.], ester gum, polyterpene resin [ Yashara Chemical Co., Ltd. trade name Clearon P125], polyolefin resin, polystyrene resin, aromatic petroleum resin [trade name Alcon SM-10 made by Arakawa Chemical Industries, Ltd.], alicyclic hydrogenated petroleum resin Etc. Examples of the anti-aging agent include 245, 259, 565, 1010, 1035, 1076, 1081, 1098, 1222, and 1330 of trade name Irganox series manufactured by Ciba Specialty Chemicals.

Examples of the light stabilizer include trade names Tinuvin series 292, 144, and 622LD manufactured by Ciba Specialty Chemicals Co., Ltd., trade names Sanol series LS770 and LS440 manufactured by Daiichi Sankyo Co., Ltd., Sumitomo Chemical Co., Ltd. The product name Sumisorb TM-061 and the like can be mentioned. Examples of the coupling agent include γ-aminopropyltrimethoxysilane, γ-mercaptopropyltriethoxysilane, and γ-methacryloxypropyltriethoxysilane. Commercially available coupling agents include Toray Dow Corning Silicone Co., Ltd. trade name SH series 6020, 6020P, 6062, 6030, Shin-Etsu Chemical Co., Ltd. trade name KBE series 903, 603, 403, etc. Can be mentioned. The pressure-sensitive adhesive composition can be obtained by mixing other additives in a predetermined ratio in addition to the essential components A, B, C and D.
(Method for producing antireflection film 1)
The antireflection film 1 is a surface opposite to the release film 6 after coating the adhesive composition on the release film 6 and curing the adhesive composition by irradiating active energy rays. Is bonded (transferred) to the surface opposite to the antireflection layer 4 of the transparent base film 2 on which the hard coat layer 3 and the antireflection layer 4 are laminated. Examples of the method for applying the pressure-sensitive adhesive composition include a curtain coating method, a roll coating method, a flow coating method, a spray coating method, and a dipping method. Examples of the active energy rays include electromagnetic waves such as far ultraviolet rays, ultraviolet rays, near ultraviolet rays, X rays and γ rays, electron beams, proton rays, and neutron rays. Among these, it is advantageous to employ ultraviolet rays as energy rays because of the film formation rate, that is, the curing rate of the pressure-sensitive adhesive composition, the availability of the energy ray irradiation device, the price, and the like.

  This ultraviolet ray is mainly composed of light having a wavelength range of 150 to 450 nm, and can be generated from a chemical lamp, a high-pressure mercury lamp, a metal halide lamp, a xenon lamp or the like. In this case, the photopolymerization initiator has an absorption region at a light wavelength of 220 to 450 nm, and the absorption region of the ultraviolet absorber contained in the pressure-sensitive adhesive composition is 150 nm or less. The pressure-sensitive adhesive composition can be sufficiently cured by irradiating with ultraviolet rays having a wavelength range of ˜450 nm. The pressure-sensitive adhesive composition can be applied as it is without dissolving in the organic solvent, but the pressure-sensitive adhesive composition contains an organic solvent as long as the effects of the present invention are not impaired. Also good. The antireflection film 1 thus obtained is used by peeling the release film 6 and sticking it to the front surface of the plasma display panel, for example.

The actions and effects exhibited by the above embodiment will be described collectively below.
In the antireflection film 1 according to this embodiment, the ultraviolet absorbing property is expressed by the ultraviolet absorber contained in the pressure-sensitive adhesive layer 5. Moreover, since the reactive polymer which is the component A has a mass average molecular weight (MW) set to 50,000 to 800,000, the miscibility with the monomer of the component C is good, and excellent adhesiveness and its persistence. Sex is expressed. Furthermore, since the absorbance of the pressure-sensitive adhesive layer 5 at a light wavelength of 380 nm is set to 1.3 to 2.7, it is possible to effectively suppress the transmission of ultraviolet rays, and thus retain the characteristics of the antireflection film 1. it can. Further, reflection of light is suppressed by the antireflection layer 4. Therefore, the antireflection film 1 can exhibit excellent ultraviolet absorptivity, can suppress reflection of light, and can improve durability. Therefore, this antireflection film 1 can be suitably used for an electronic display panel such as a plasma display.

  In addition, the reactive polymer of component A includes a repeating unit of a (meth) acrylic monomer in the main chain, and thus exhibits excellent weather resistance and optical properties (translucency, transparency, etc.) In addition, since the side chain contains a (meth) acryloyl functional group, the weather resistance is high, and the adhesive residue on the adherend can be reduced during peeling. Furthermore, since an alkoxysilyl-based functional group is contained in the side chain, adhesion, heat resistance, and moist heat resistance can be improved when glass is used as the adherend.

  -Monomer of component C contains tetrahydrofurfuryl acrylate (component C-1) and 4-hydroxybutyl acrylate (component C-2), and component A is added to the total amount of component A and component C. 5-30 mass% and 70-95 mass% of C components are contained. For this reason, the improvement of the applicability | paintability of an adhesive composition and the adhesive force with respect to a to-be-adhered body can be aimed at.

-Since the glass transition temperature (Tg) of the modified (meth) acrylic polymer is -5 to -55 ° C, suitable adhesive properties (adhesion strength, non-contamination, etc.) can be imparted to the adhesive layer 5. it can.
The antireflection film 1 is manufactured by coating the pressure-sensitive adhesive composition on the release film 6 and curing the pressure-sensitive adhesive composition by irradiating active energy rays, and then opposite to the release film 6. The side surface is bonded to the surface opposite to the antireflection layer 4 of the transparent base film 2 on which the hard coat layer 3 and the antireflection layer 4 are laminated. For this reason, the pressure-sensitive adhesive composition can be quickly cured by irradiation with active energy rays, and a large-sized dryer required for a conventional room-temperature-curing pressure-sensitive adhesive is not required, and the antireflection film 1 is hard-coated. It can be easily produced without affecting the layer 3 and the antireflection layer 4.

Hereinafter, although the said embodiment is described further more concretely by giving an Example and a comparative example, this invention is not limited to the range of these Examples.
(A) Optical characteristics (a-1) Measurement of minimum reflectance As an adherend, a glass plate coated with black paint to eliminate the influence of back reflection is separated from the surface opposite to the surface coated with black paint. A sample in which the antireflection film 1 for PDP (plasma display panel) from which the mold film 6 was removed was attached was prepared. Using the UV-visible spectrophotometer (manufactured by JASCO Corporation, V-560), the spectral reflectance spectrum of 5 ° and −5 ° at a wavelength of 400 to 800 nm was measured for the obtained sample, and the reflectance spectrum The minimum reflectance (%) was read.
(A-2) Measurement of absorbance A sample in which an antireflection film 1 for PDP from which the release film 6 was removed was attached to a glass plate as an adherend was prepared. This sample was measured using an ultraviolet-visible spectrophotometer (manufactured by Shimadzu Corporation, UV-1600PC), and the absorbance at a wavelength of 380 nm was read.
(A-3) Measurement of haze value The sample which stuck the antireflection film 1 for PDP which removed the release film 6 to the glass plate as a to-be-adhered body was produced. About this sample, haze value (%) was measured using the haze meter [Nippon Denshoku Industries Co., Ltd. make, NDH2000].
(A-4) Measurement of total light transmittance The sample which stuck the antireflection film 1 for PDP which removed the release film 6 to the glass plate as a to-be-adhered body was produced. About this sample, the total light transmittance (%) was measured using the haze meter (Nippon Denshoku Industries Co., Ltd. product, NDH2000).
(A-5) Measurement of transmission color difference The sample which stuck the antireflection film 1 for PDP which removed the release film 6 to the glass plate as a to-be-adhered body was produced. The transmission color difference (b *) was measured for this sample using a color difference meter (Nippon Denshoku Industries Co., Ltd., SQ2000).
(B) Durability test The sample which stuck the antireflection film 1 for PDP which removed the release film 6 to the glass plate as a to-be-adhered body was produced. This sample was left in an environment of 60 ° C. and 90% RH for 1000 hours, and the minimum reflectance (%), absorbance, haze value (%), total light transmittance (%), color difference, adherend (glass) and The adhesion was evaluated. Adhesion was judged to be good when the antireflective film 1 was not misaligned or peeled off from the glass (O), and was judged as poor when misalignment or peeling was seen (X).
(C) Measurement method for synthesis of UV-curable pressure-sensitive adhesive composition (c-1) (meth) acryloyl group content and triethoxysilane group content methacryloyl group content and triethoxysilyl group content of the obtained polymer The amount was quantified by acid-base titration. Specifically, the obtained polymer is mixed with di-n-butylamine (DBA), unreacted isocyanate groups of (meth) acrylic compounds and alkoxysilane compounds are reacted with DBA, and the consumed DBA The amount was quantified by back titration with hydrochloric acid.
(C-2) Mass average molecular weight The mass average molecular weight is a polystyrene-reduced mass average molecular weight measured by a GPC-LS method.
(C-3) Glass transition temperature (Tg)
The glass transition temperature can be adjusted within the range of −5 to −55 ° C. by appropriately controlling the type and ratio of the repeating units constituting the (meth) acrylic polymer serving as the main chain. The glass transition temperature (theoretical value) of the polymer P composed of repeating units derived from the monomers M1, M2,... Mn can be calculated from Fox's formula (formula (1) shown below). Therefore, the type and ratio of the repeating units may be adjusted with reference to this formula.

1 / TgP = r1 / TgM1 + r2 / TgM2 .. + rn / TgMn (1)
(However, TgP: Glass transition temperature (K) of polymer P, TgM1: Glass transition temperature (K) of homopolymer of monomer M1, TgM2: Glass transition temperature of homopolymer of monomer M2 (K ), TgM3: Glass transition temperature (K) of homopolymer of monomer Mn, r1: Mass fraction of monomer M1 unit in polymer P, r2: Mass fraction of monomer M2 unit in polymer P Rate, rn: mass fraction of monomeric Mn units in polymer P)
Specifically, since the above-mentioned modified (meth) acrylic polymer has a relatively low glass transition temperature of −5 to −55 ° C., the glass transition temperature of the homopolymer is relatively low during the polymerization. Monomers such as butyl acrylate (Tg: −55 ° C.), ethyl acrylate (Tg: −24 ° C.), 2-ethylhexyl acrylate (Tg: −85 ° C.), etc. A monomer having a relatively high glass transition temperature, for example, methyl methacrylate (Tg: 105 ° C.), styrene (Tg: 100 ° C.), or the like is appropriately added to the polymerization reaction to have a desired glass transition temperature. A polymer can be obtained. Moreover, you may select suitably what has a desired glass transition temperature from commercially available (meth) acrylic-type polymers, and you may use this for modification | denaturation.

In this specification, “glass transition temperature” means a glass transition temperature measured in accordance with JIS K7121 (plastic transition temperature measurement method).
(appearance)
When the pressure-sensitive adhesive layer 5 of the antireflection film 1 is visually observed and judged to be good when there are no coating lines, repellency, unevenness, etc. (○), when coating lines, repellency, unevenness, etc. are observed Judged as bad (×).
(Preparation of hard coat layer coating solution A)
Urethane acrylate [manufactured by Nippon Synthetic Chemical Industry Co., Ltd., trade name: UV-7600B] 80 parts by mass, photopolymerization initiator [manufactured by Ciba Specialty Chemicals Co., Ltd., trade name: Irgacure 184] and 80 parts by mass of methyl alcohol The parts were stirred and mixed to obtain a hard coat layer coating solution A.
(Preparation of low refractive index layer coating solution A)
104 parts by mass of perfluoro- (1,1,9,9-tetrahydro-2,5-bisfluoromethyl-3,6-dioxanonenol) and bis (2,2,3,3,4,4,4) 5,5,6,6,7,7-dodecafluoroheptanoyl) peroxide-containing fluorine-containing allyl ether polymer (number average molecular weight 72) obtained by polymerization reaction of 11 parts by mass of an 8% by mass perfluorohexane solution Fluorine-containing reactive heavy having a polymerizable double bond from 5 parts by mass, 43 parts by mass of methyl ethyl ketone (MEK), 1 part by mass of pyridine, and 1 part by mass of α-fluoroacrylic acid fluoride. A combined solution (solid content: 15% by mass, α-fluoroacryloyl group introduction rate: 50 mol%) was prepared.

Further, hollow silica sol [manufactured by Catalyst Kasei Kogyo Co., Ltd., trade name: ELCOM NY-1001SIV, 25 mass% dispersion of hollow silica sol with isopropyl alcohol, average particle size: 60 nm] 2000 parts by mass, γ-acryloyloxypropyltrimethoxy 70 parts by mass of silane (manufactured by Shin-Etsu Chemical Co., Ltd., KBM5103) and 80 parts by mass of distilled water were mixed to prepare modified hollow silica fine particles (sol) (average particle size: 60 nm). And, 333 parts by mass of the fluorine-containing reactive polymer solution, 200 parts by mass of the modified hollow silica fine particles, 5 parts by mass of a photopolymerization initiator [Ciba Specialty Chemicals Co., Ltd., Irgacure 907], and isopropyl alcohol 2000 The low refractive index layer coating liquid A was obtained by mixing with parts by mass.
(Preparation of antireflection film A)
Biaxially stretched polyester film as the transparent base film 2 [polyethylene terephthalate film with adhesive layers on both sides, manufactured by Toyobo Co., Ltd., Cosmo Shine A4300, thickness 100 μm, refractive index n = 1.65] The hard coat layer coating solution A was applied by a gravure coating method so that the dry film thickness was 2 μm, and then cured by irradiating ultraviolet rays with an energy of 400 mJ / cm ² . Thereafter, the low refractive index layer coating solution A is applied by a gravure coating method so that the optical film thickness becomes 100 to 160 nm, dried, and then cured by irradiation with ultraviolet rays at an energy of 400 mJ / cm ^{2 in} a nitrogen atmosphere. Thus, an antireflection film A (one not provided with the pressure-sensitive adhesive layer 5) was produced. The refractive index of the low refractive index layer was n = 1.35.
(Preparation of UV curable adhesive composition)
[Synthesis of component A]
First, a modified (meth) acrylic polymer of component A was synthesized.
(Synthesis of A-1)
A four-necked flask (2 L) equipped with a cooler, a dropping funnel and a thermometer, an acrylic copolymer shown below (trade name: Paracron AW4500H, solid content 40%, toluene solvent, manufactured by Negami Kogyo Co., Ltd.) 586 g, solvent (ethyl acetate) 890 g, and reaction catalyst (dibutyltin laurate) 0.3 g were charged and heated to 40 ° C. with stirring. The acrylic copolymer contains a butyl acrylate unit, an ethyl acrylate unit, a methyl methacrylate unit, a hydroxybutyl acrylate unit and a hydroxyethyl acrylate unit, and has a mass average molecular weight of about 330,000 and a glass transition temperature of −8 ° C. Met. Moreover, the hydroxyl group content of this acrylic copolymer was 15 mmol per 100 g of acrylic copolymer (50 per molecule of acrylic copolymer).

(Meth) acrylic compound (2-methacryloyloxyethyl isocyanate, trade name: Karenz MOI manufactured by Showa Denko KK) 1.8 g prepared in advance and alkoxysilane compound (3-isocyanatopropyltriethoxysilane) A mixed solution prepared by dissolving 1.1 g of trade name: KBE-9007) manufactured by Shin-Etsu Chemical Co., Ltd. in 120 g of a solvent (ethyl acetate) was dropped into a four-necked flask through the dropping funnel. This dropping was performed over about 1 hour while maintaining the temperature inside the four-necked flask at 40 ° C. The reaction was continued at a temperature of 40 ° C. even after completion of the dropwise addition, and when the disappearance of the isocyanate group was confirmed by titration analysis of the reaction solution, the reaction was terminated and a modified (meth) acrylic polymer was obtained. The reaction time was 5 hours from the start of the dropwise addition of the mixed solution. The results are shown in Table 1.
(Synthesis of A-2 to A-5)
A modified (meth) acrylic polymer was obtained in the same manner as in A-1, except that the conditions such as the type of base polymer, the modification rate of the methacryloyl group, the modification rate of the triethoxysilyl group were changed. The results are shown in Table 1.

（実施例１）
変性（メタ）アクリル系重合体（Ａ−１成分）７質量部、光重合開始剤（Ｂ成分）〔チバスペシャルティケミカルズ（株）製の商品名：イルガキュア８１９〕１０質量部、テトラヒドロフルフリルアクリレート（Ｃ−１成分）〔大阪有機化学工業（株）製、商品名：ビスコート＃１５０〕７８質量部及び４−ヒドロキシブチルアクリレート（Ｃ−２成分）〔日本化成（株）製、商品名：４ＨＢＡ〕１５質量部、ベンゾトリアゾール〔チバスペシャルティケミカルズ（株）製、商品名:チヌビン３２６〕５質量部を混合し、有機溶剤を除去して濃縮することにより、紫外線硬化型粘着剤組成物を調製した。

(Example 1)
7 parts by mass of modified (meth) acrylic polymer (component A-1), photopolymerization initiator (component B) [trade name: Irgacure 819 manufactured by Ciba Specialty Chemicals Co., Ltd.], 10 parts by mass, tetrahydrofurfuryl acrylate ( C-1 component) [manufactured by Osaka Organic Chemical Industry Co., Ltd., trade name: Biscoat # 150] 78 parts by mass and 4-hydroxybutyl acrylate (C-2 component) [manufactured by Nippon Kasei Co., Ltd., trade name: 4HBA] An ultraviolet curable pressure-sensitive adhesive composition was prepared by mixing 15 parts by mass and 5 parts by mass of benzotriazole [trade name: Tinuvin 326, manufactured by Ciba Specialty Chemicals Co., Ltd.], removing the organic solvent, and concentrating.

This ultraviolet curable pressure-sensitive adhesive composition was applied onto the release film 6 by a die coating method to form a coating film having a thickness of 15 μm. Next, the photopolymerizable compound is polymerized by irradiating ultraviolet rays with an integrated light amount of 500 mJ / cm ² with a high-pressure mercury lamp, and then transferred to the surface opposite to the antireflection layer 4 of the antireflection film A according to a conventional method. Thus, an antireflection film 1 was produced. And he was cured for one day. The antireflection film 1 thus obtained was measured for the minimum reflectance, absorbance, haze value, total light transmittance, color difference, and durability regarding their physical properties, and the results are shown in Table 2.
(Examples 2-7 and Comparative Examples 1-3)
An antireflection film 1 was produced in the same manner as in Example 1 except that the type and content of the A component, the content of the C-1 component and the C-2 component, and the type of the D component were changed. And the physical property was measured similarly to Example 1 about the obtained antireflection film 1, and those results were shown in Table 2.
(Comparative Example 4)
The antireflection film 1 was produced in the same manner as in Example 1 except that the content of the ultraviolet absorber as the D component was increased and the absorbance of the pressure-sensitive adhesive layer 5 was set to a high value of 3.1. And the physical property was measured similarly to Example 1 about the antireflection film 1, and those results were shown in Table 2.
(Comparative Example 5)
For 100 g of commercially available acrylic copolymer [manufactured by Negami Kogyo Co., Ltd., trade name: Paracron AW4500H, solid content 40%, toluene solvent], hardener [manufactured by Nippon Polyurethane Industry Co., Ltd., trade name: Coronate L] 0.5g was mixed and the thermosetting adhesive was prepared. Then, the thermosetting pressure-sensitive adhesive is applied on the release film 6 by a die coating method and dried to form a coating film having a film thickness of 25 μm, which is transferred to the surface of the antireflection film A opposite to the antireflection layer 4. By doing so, the antireflection film 1 was produced.

  In addition, content of each component in Table 2 represents a mass part.

表２に示した結果より、実施例１〜７の反射防止フィルム１は、養生日数が短くても、紫外線吸収性、反射率、全光線（可視光線）透過率などの初期性能及びそれらの物性についての耐久性能に優れ、さらに密着性についての耐久性能にも優れていることが明らかになった。

From the results shown in Table 2, the antireflection films 1 of Examples 1 to 7 have initial performances such as ultraviolet absorptivity, reflectance, and total light (visible light) transmittance and their physical properties even when the curing days are short. It was clarified that it was excellent in durability performance with respect to, and also excellent in durability performance regarding adhesion.

  On the other hand, in Comparative Example 1, since the mass average molecular weight of the modified (meth) acrylic polymer (component A) constituting the pressure-sensitive adhesive composition is high, the compatibility with other components is low, and coating is performed. The result was a lot of streaks, repellency and unevenness. In Comparative Example 2, since the mass average molecular weight of the modified (meth) acrylic polymer (component A) is low, the adhesive strength is not sufficiently exhibited, and the pressure-sensitive adhesive layer 5 is peeled off from the transparent base film 2 and a positional shift occurs. I arrived. In Comparative Example 3, since the ultraviolet ray absorber was not contained in the pressure-sensitive adhesive layer 5, the absorbance was as low as 0.01 and the ultraviolet absorptivity was not expressed. In Comparative Example 4, the content of the ultraviolet absorber in the pressure-sensitive adhesive layer 5 was large, the absorbance was increased, the pressure-sensitive adhesiveness was lowered, the pressure-sensitive adhesive layer 5 was peeled off from the transparent substrate film 2, and a displacement occurred. In Comparative Example 5, since the curing required for the thermosetting pressure-sensitive adhesive was not sufficient, the adhesive force was not sufficiently developed, and the pressure-sensitive adhesive layer 5 was peeled off from the transparent substrate film 2 and the position shift occurred. .

  Incidentally, as seen in Comparative Example 3, since the absorbance when the UV light absorber is not contained in the pressure-sensitive adhesive layer 5 is a small value of 0.01, the transparent base film 2 other than the pressure-sensitive adhesive layer 5, The absorbance of the hard coat layer 3 and the antireflection layer 4 is small, and the absorbance of the antireflection film 1 and the absorbance of the adhesive layer 5 are substantially the same.

It should be noted that the above embodiment can be modified as follows.
A plurality of reactive polymers as the component A constituting the pressure-sensitive adhesive composition can be used to adjust the molecular weight and the glass transition temperature.

  -At least one layer of the transparent base film 2, the hard coat layer 3 and the antireflection layer 4 contains an ultraviolet absorber, and together with the ultraviolet absorber contained in the adhesive layer 5, synergistically absorbs the ultraviolet light of the antireflection film 1. It is also possible to configure so as to be exhibited.

  -The near-infrared absorber can be contained in at least one layer of the transparent substrate film 2, the hard coat layer 3, and the antireflection layer 4 so that the antireflection film 1 can exhibit a near infrared absorption effect.

-It is possible to provide a glare-preventing layer or the like on the hard coat layer 3 or the like.
-As a manufacturing method of the anti-reflective film 1, an adhesive composition is directly applied on the transparent base film 2 on the opposite side of the anti-reflective layer 4 of the transparent base film 2 on which the hard coat layer 3 and the anti-reflective layer 4 are laminated. It is also possible to employ a method in which the pressure-sensitive adhesive layer 5 is formed by coating, irradiating with active energy rays and curing.

Furthermore, the technical idea grasped from the embodiment will be described below.
-Content of the said ultraviolet absorber (D component) is 1-5 mass with respect to 100 mass parts of total amounts of the reactive polymer (A component) and the monomer (C component) which has a polymerizable double bond. The antireflective film having ultraviolet absorptivity according to any one of claims 1 to 4, wherein the antireflective film has ultraviolet absorption properties. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-4, the ultraviolet-ray absorptivity of an antireflection film and the adhesiveness of the adhesive layer with respect to a transparent base film are exhibited with sufficient balance. be able to.

  The antireflection film having ultraviolet absorptivity according to any one of claims 1 to 4, wherein the transmittance of light at a wavelength of 380 nm is 5% or less. When comprised in this way, in addition to the effect of the invention which concerns on any one of Claims 1-4, the ultraviolet absorptivity of an antireflection film can be improved.

  The method for producing an antireflection film having ultraviolet absorptivity according to claim 5, wherein the active energy rays are ultraviolet rays. When comprised in this way, in addition to the effect of the invention which concerns on Claim 5, the hardening rate of an adhesive composition can be improved with a simple method.

Sectional drawing which shows the antireflection film which has the ultraviolet absorptivity in embodiment of this invention.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Antireflection film, 2 ... Transparent base film, 3 ... Hard-coat layer, 4 ... Antireflection layer, 5 ... Adhesive layer, 6 ... Release film.

Claims (5)

Reflection is made by laminating a hard coat layer and an antireflection layer in this order on a transparent base film, and an adhesive layer is provided on the transparent base film opposite to the side where the antireflection layer is provided. Prevention film,
The pressure-sensitive adhesive layer contains a reactive polymer (component A), a photopolymerization initiator (component B), a monomer having a polymerizable double bond (component C) and an ultraviolet absorber (component D). A pressure-sensitive adhesive formed from a curable pressure-sensitive adhesive composition and having a reactive polymer (component A) having a mass average molecular weight (MW) of 50,000 to 800,000 and an ultraviolet absorber (component D) at a light wavelength of 380 nm An antireflection film having ultraviolet absorptivity, wherein the layer has an absorbance of 1.3 to 2.7. The reactive polymer (component A) forming the pressure-sensitive adhesive layer contains a repeating unit derived from a (meth) acrylic monomer in the main chain, and a functional group containing a (meth) acryloyl skeleton in the side chain; The antireflective film having ultraviolet absorptivity according to claim 1, which is a modified (meth) acrylic polymer having a functional group containing an alkoxysilyl skeleton. The monomer (component C) having a polymerizable double bond forming the pressure-sensitive adhesive layer contains tetrahydrofurfuryl acrylate (component C-1) and 4-hydroxybutyl acrylate (component C-2), The ultraviolet ray absorbing property according to claim 1 or 2, comprising 5 to 30% by mass of the A component and 70 to 95% by mass of the C component with respect to the total amount of the A component and the C component. Antireflection film. The glass transition temperature (Tg) of the modified (meth) acrylic polymer is -5 to -55 ° C, and the antireflection film having ultraviolet absorptivity according to claim 2 or 3. It is a manufacturing method of the reflection preventing film of Claim 1, Comprising: The said ultraviolet curable adhesive composition is coated on a release film, and an ultraviolet curable adhesive composition is irradiated by irradiating an active energy ray. After curing, an ultraviolet ray characterized in that the surface opposite to the release film is bonded to the surface opposite to the antireflection layer of the transparent substrate film on which the hard coat layer and the antireflection layer are laminated. A method for producing an antireflection film having absorptivity.

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