JP6701702B2 - Photocurable resin molding, polarizing plate and transmissive liquid crystal display using the same - Google Patents

Description

  The present invention provides a photocurable resin molded product that can be used as a protective film for a liquid crystal display device, a plasma display device, a light emitting diode display device, an EL display device, a display device component such as a touch panel, or other functional film. The present invention relates to a polarizing plate and a transmissive liquid crystal display used.

  In recent years, functional films have been used in a wide range of fields including electronics, energy, medical care, foods, building materials, etc., and are used for plastic substrate films such as TAC films, PET films, PI films, and antistatic properties and barrier properties. A coating is provided for the purpose of imparting optical characteristics, thermal characteristics, and functionality.

  When a coating is applied to a plastic substrate film to produce a functional film, there is a concern that the coating layer may peel off. For example, when the solubility is low, the coating layer is likely to be peeled off from the plastic substrate film during the processing process and the like, which makes it difficult to produce the target functional film (see, for example, Patent Document 1).

  Therefore, a method is known in which an ultraviolet curable resin is used as the material of the plastic base film and the plastic base film is produced by photo-curing (see, for example, Patent Document 2). According to this method, the plastic substrate film and the resin for the purpose of imparting functionality have a wider selection range, and by adjusting the resin ratio, a film with excellent functionality can be produced, but both strength and extensibility are compatible. Is difficult. That is, those having excellent strength were liable to become brittle due to lack of extensibility, and those having excellent extensibility were often low in heat resistance and strength.

  Further, there is an optical film containing a (meth)acrylate polymer component and having both a low photoelastic coefficient and a low retardation (see, for example, Patent Document 3).

JP, 2006-58728, A Japanese Patent No. 46900053 JP, 2014-115538, A

  In view of the above problems, it is an object of the present invention to provide a photo-curable resin molding excellent in strength and extensibility, a polarizing plate and a transmissive liquid crystal display using the same.

The photocurable resin molded product according to the present invention is a photocurable resin molded product comprising a photocurable film of a coating liquid containing an ultraviolet curable monomer and an ultraviolet polymerization initiator, and the ultraviolet curable monomer is (meth)acryloyl. Having a (meth)acrylate A having a group and a double bond reaction rate represented by the following formula (1) of 20% or more and less than 60% and a (meth)acryloyl group, and having the following formula (1): The shown double bond reaction rate includes 60% or more and less than 95% of (meth)acrylate B, and the mass ratio of (meth)acrylate A and (meth)acrylate B is 20-80:80-20. , and the maximum stress in the tensile properties of the photocurable resin molded article is at 45N / mm ² or more state, and are tensile elongation is 15% or more represented by the following formula (2), the photocurable resin molding thickness is characterized 10~100μm der Rukoto.
Double bond reaction rate (%)=100×{1-(P0-P1)} Equation (1)
Tensile elongation (%)=100×{(length at break)-(initial length before tensile test)}/initial length before tensile test... Formula (2)
here,
P0: peak intensity of the absorption of 810 cm ^-1 to the coating liquid in the infrared absorption spectrum before photocuring P1: the peak intensity of the absorption of 810 cm ^-1 in the infrared absorption spectrum after the coating liquid photocuring.

  Further, the photocurable resin molding according to the present invention can be used for a polarizing plate, a transmissive liquid crystal display and the like.

  According to the present invention, it is possible to provide a photo-curable resin molded product excellent in strength and extensibility, a polarizing plate and a transmissive liquid crystal display using the same.

  Hereinafter, embodiments of the present invention will be described. Note that the embodiments of the present invention are not limited to the embodiments described below, and modifications such as design changes can be added based on the knowledge of those skilled in the art, and such modifications. The embodiments added with are also included in the scope of the embodiments of the present invention.

  The UV-curable monomer used in the present invention refers to a substance that cures through a crosslinking reaction upon irradiation with active energy rays such as ultraviolet rays and electron beams.

  The photocurable resin molded product according to the present invention is produced by photocuring a coating liquid containing an ultraviolet curable monomer and an ultraviolet polymerization initiator, and the ultraviolet curable monomer includes two types of (meth)acrylate A and ( And a (meth)acrylate B.

  A monomer containing two (meth)acryloyl groups in one molecule is used as the (meth)acrylate A, and two or three (meth)acryloyl groups are contained in one molecule as the (meth)acrylate B. Use monomer. When the number of (meth)acryloyl groups is one, it is difficult to form a desired photocurable resin molded product, and tack due to insufficient curing occurs. When the number of (meth)acryloyl groups is 4 or more, curling occurs due to large curing shrinkage, and the tensile elongation of the coating film is significantly reduced. In addition, in this specification, a (meth)acrylic monomer refers to both an acrylic acid ester monomer and a methacrylic acid ester monomer. Similarly, (meth)acrylate refers to both acrylates and methacrylates.

(Meth)acrylate A mainly contributes to the strength improvement. A double bond reaction rate of a photocured product obtained by photocuring a coating liquid containing an ultraviolet polymerization initiator containing only (meth)acrylate A by irradiation with ultraviolet rays having an exposure amount of 250 mJ/cm ² is 20% or more 60. It is preferably less than %. Here, the double bond reaction rate is a value obtained by the following equation (1). When the double bond reaction rate is less than 20%, the strength of the photocurable resin molded article is insufficient due to insufficient curing, and when the double bond reaction rate is 60% or more, the photocurable resin molded article is obtained. Is easily fragile.
Double bond reaction rate (%)=100×{1-(P0-P1)} Equation (1)
here,
P0: peak intensity of the absorption of 810 cm ^-1 in the infrared absorption spectrum before photocuring the coating liquid P1: the peak intensity of the absorption of 810 cm ^-1 in the infrared absorption spectrum after photocuring the coating liquid is there.

The (meth)acrylate B mainly contributes to the improvement of extensibility. The double bond reaction rate of the photo-cured product obtained by photo-curing the coating liquid containing the ultraviolet polymerization initiator containing (meth)acrylate B alone by irradiating it with an exposure dose of 250 mJ/cm ² is 60% or more 95 It is preferably less than %. When the double bond reaction rate is less than 60%, insufficient curing of the photocurable resin molding results in poor balance between strength and extensibility.

  The mixing ratio of (meth)acrylate A and (meth)acrylate B is preferably 20:80 to 80:20 in terms of mass ratio. If this blending ratio is not satisfied, it will be difficult to impart the desired strength or extensibility.

  As the (meth)acrylate A, for example, urethane acrylate C-1 and epoxy ester 3002A (Kyoeisha Chemical Co., Ltd.) described in JP-A-2013-159691 can be used.

  Examples of the (meth)acrylate B include purple UV 7000B (Nippon Gosei Kagaku KK), UF-8001G, light acrylate 3EG-A, light acrylate DCP-4EO-A, light acrylate 1,6-HX-A (above, Kyoeisha Chemical Co., Ltd. Company) can be used.

  Further, a photopolymerization initiator is added in order to cure the UV curable monomer by UV irradiation. The photopolymerization initiator may be any one that generates a radical when irradiated with ultraviolet rays, and for example, acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, and thioxanthones can be used. Can be done.

  The amount of the polymerization initiator used is preferably 0.1 to 10% by mass based on the total solid content in the coating liquid, and if it is more or less than this range, the film hardness tends to be low. In particular, if the amount is too large, the cured resin film may be colored.

  Further, the solvent contained in the coating liquid for forming the photocurable resin molded body has good compatibility with the resin, and is appropriately selected from acetone or methyl ethyl ketone which is a ketone solvent in consideration of coating suitability and the like. .

  Additives may be used in the prepared coating liquid for the purpose of imparting antifouling properties, imparting slipperiness, preventing defects and improving the dispersibility of particles. Examples of additives include polyether-modified polymethylalkylsiloxane, polyether-modified polydimethylsiloxane, fluorine-modified polymer, acrylic copolymer, polyester-modified acryl-containing polydimethylsiloxane, and silicon-modified polyacryl.

  The ultraviolet curable monomer and the photopolymerization initiator can be dissolved in a solvent to adjust the solid content to 40 to 100% by mass, more preferably 60 to 95% by mass, and applied to a plastic substrate film. When the solid content is less than 40% by mass, it becomes difficult to produce a cured resin film having a desired film thickness.

As a light source for curing the ultraviolet curable monomer by a photocuring reaction to form a cured resin film, any light source that emits ultraviolet light can be used without limitation. For example, a low pressure mercury lamp, a medium pressure mercury lamp, a high pressure mercury lamp, a carbon arc lamp, a metal halide lamp, a xenon lamp, an electrodeless discharge tube, etc. can be used. The irradiation amount of ultraviolet rays is usually 100 to 800 mJ/cm ² as irradiation conditions.

  A photo-curable resin molded body is completed by sufficiently mixing the above materials and performing coating, drying and UV exposure in this order.

The photocurable resin molded product produced by the above method has a tensile property with a maximum stress of 45 N/in that the molded product does not break when the molded product is wound up and strength and extensibility as a base film are secured. and mm ² or more, it is desirable tensile elongation represented by the following formula (2) is 15% or more.
Tensile elongation (%)=100×{(length at break)-(initial length before tensile test)}/initial length before tensile test... Formula (2)

  The photocurable resin molded product according to the present invention can also be applied to optical devices such as a polarizing plate and a transmissive liquid crystal display.

  The photocurable resin molded product obtained in the present invention may have an antireflection property, an antifouling property, an antiglare property, an electromagnetic wave shielding property, an infrared absorbing property, an ultraviolet absorbing property, a color correcting property, if necessary, on the molded product. Is provided. Examples of these functional layers include an antireflection layer, an antifouling layer, an antiglare layer, an electromagnetic wave shielding layer, an infrared absorbing layer, an ultraviolet absorbing layer, and a color correction layer. Note that these functional layers may be a single layer or a plurality of layers. For example, the antireflection layer may be composed of a single layer of a low refractive index layer, or may be composed of a plurality of layers formed by repeating a low refractive index layer and a high refractive index layer. The functional layer may have a plurality of functions such as an antireflection layer having antifouling performance.

  A wet coating method can be used as a method for producing the photocurable resin molded body. Examples of wet coating methods include dip coating method, spin coating method, flow coating method, spray coating method, roll coating method, gravure roll coating method, air doctor coating method, blade coating method, wire doctor coating method, knife coating method, A reverse coating method, a transfer roll coating method, a micro gravure coating method, a kiss coating method, a cast coating method, a slot orifice coating method, a calendar coating method, a die coating method and the like can be mentioned.

  The thickness of the photocurable resin molding produced by the above method is preferably 10 to 100 μm. When the thickness of the photo-curable resin molded body is less than 10 μm, the strength is lowered and it is easy to break, and when it is more than 100 μm, the photo-curing inside the photo-curable resin molded body is likely to be insufficient. is there.

  Hereinafter, the present invention will be described more specifically by way of examples, but the present invention is not limited to these examples.

  The photocurable resin molding was evaluated according to the following method.

<Tensile properties>
A Shimadzu small bench tester EZ-L was used as a measuring device. The produced photocurable resin molded body was cut into a size of MD×TD: 75×15 mm, pulled in a MD direction with a load of 1 kN at a speed of 5 mm/min, and the maximum stress was measured. The tensile elongation (=maximum elongation at break) was calculated using the above equation (2).

In addition, the peak intensity of absorption at 810 cm ⁻¹ used for the double bond reaction rate represented by the above formula (1) is calculated by Fourier transform infrared spectrophotometer (FT-IR (JEOL Ltd.: JR-6500)). ) Was used.

The structures or compound names of the main components of the resin materials (trade names) used in Examples and Comparative Examples are as follows.
-Urethane acrylate A: Synthesized as follows with reference to urethane acrylate C-1 described in JP2013-159691A. 31.5 parts by mass of isophorone diisocyanate and 0.1 part by mass of dibutyltin dilaurate were charged into a reaction vessel equipped with a cooling tube, a stirrer and a thermometer, and the temperature was raised to 50°C. Next, 68.4 parts by mass of ε-caprolactone 1 mol-modified 2-hydroxyethyl acrylate (“PLACCEL FA1DDM” manufactured by Daicel Chemical Industries, Ltd.) was added dropwise over 1 hour, and after the addition, the reaction was carried out by stirring at 90° C. for 10 hours. It was When the amount of residual isocyanate in this reaction solution was measured by using FT-IR, the amount of isocyanate was finally almost zero because the urethanization reaction proceeded quantitatively. The obtained urethane acrylate was 99.9 parts by mass. (In the formula, A is an acryloyloxy group.)

・UF-8001G: Urethane acrylate (Kyoeisha Chemical Co., Ltd.)
・Purple UV 7000B: Urethane acrylate (Nippon Gosei Kagaku)
・Light acrylate 3EG-A: ethylene glycol acrylate (Kyoeisha Chemical Co., Ltd.)
Light acrylate DCP-4EO-A: tricyclodecane skeleton-containing acrylate (Kyoeisha Chemical Co., Ltd.)
Light acrylate 1,6-HX-A: 1,6-hexanediol diacrylate (Kyoeisha Chemical Co., Ltd.)
Epoxy ester 3002A: diglycidyl ether acrylic acid adduct (Kyoeisha Chemical Co., Ltd.)
・UA-306H: Urethane acrylate (Kyoeisha Chemical Co., Ltd.)
A-TMMT: pentaerythritol tetraacrylate (Shin Nakamura Chemical Co., Ltd.)
Irgacure 184: 1-hydroxy-cyclohexyl-phenylketone (BASF, "Irgacure" is a registered trademark)
ESACURE ONE: 2-hydroxy-1-{1-[4-(2-hydroxy-2-methyl-propionyl)-phenyl]-1,3,3-trimethyl-indan-5-yl}-2-methyl- Propan-1-one (DKSH Japan, "ESACURE ONE" is a registered trademark)

<Example 1>
A PET film having a thickness of 75 μm, which is a plastic substrate film, was coated with the following photo-curable resin molding composition by a die coating method and dried, and then irradiated with ultraviolet rays of 250 mJ/cm ² by a metal halide lamp. The coating was cured. The cured film was peeled off from the PET film to obtain a photocurable resin molding having a thickness of 45 μm. After forming the photocurable resin molded body, it was allowed to stand for 1 day in an environment of a temperature of 23° C. and a humidity of 50%, and the tensile properties were evaluated. The maximum stress was 50 N/mm ² , and the tensile elongation was 25%. It was possible to obtain a photocurable resin molded product having good tensile properties.
・Acrylic resin: Urethane acrylate A 41.59 parts by mass
UF-8001G ・・・17.82 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass ・Solvent: MEK (methyl ethyl ketone) ・・・40 parts by mass

<Example 2>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 52 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 25% and good tensile properties.
・Acrylic resin: Urethane acrylate A 41.59 parts by mass
Light acrylate 3EG-A ・・・17.82 parts by mass Photo radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass Solvent: MEK ・・・40 parts by mass

<Example 3>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 55 N/mm ^2. Thus, it was possible to obtain a photocurable resin molded product having a tensile elongation of 20% and good tensile properties.
・Acrylic resin: Urethane acrylate A 41.59 parts by mass
Purple UV-7000B ・・・17.82 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Example 4>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 48 N/mm ^2. Thus, it was possible to obtain a photocurable resin molded body having a tensile elongation of 28% and good tensile properties.
・Acrylic resin: Urethane acrylate A 41.59 parts by mass
Light acrylate DCP-4EO-A ・・・17.82 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Example 5>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 57 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 15% and good tensile properties.
・Acrylic resin: Urethane acrylate A 41.59 parts by mass
Light acrylate 1,6-HX-A ・・・17.82 parts by mass Photo radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass Solvent: MEK ・・・40 parts by mass

<Example 6>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 48 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 19% and good tensile properties.
-Acrylic resin: Epoxy ester 3002A... 41.59 parts by mass
UF-8001G: 17.82 parts by mass Photo-radical polymerization initiator: Irgacure 184: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Example 7>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 50 N/mm ^2. Thus, it was possible to obtain a photocurable resin molded product having a tensile elongation of 20% and good tensile properties.
-Acrylic resin: Epoxy ester 3002A... 41.59 parts by mass
Light acrylate 3EG-A ・・・17.82 parts by mass Photo radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Example 8>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 50 N/mm ^2. Thus, it was possible to obtain a photocurable resin molded product having a tensile elongation of 20% and good tensile properties.
-Acrylic resin: Epoxy ester 3002A... 41.59 parts by mass
Purple UV-7000B ・・・17.82 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Example 9>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 45 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 23% and good tensile properties.
-Acrylic resin: Epoxy ester 3002A... 41.59 parts by mass
Light acrylate DCP-4EO-A ・・・17.82 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Example 10>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 55 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 16% and good tensile properties.
-Acrylic resin: Epoxy ester 3002A... 41.59 parts by mass
Light acrylate 1,6-HX-A ・・・17.82 parts by mass Photo radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass Solvent: MEK ・・・40 parts by mass

<Example 11>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 55 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 15% and good tensile properties.
-Acrylic resin: Urethane acrylate A... 40.00 parts by mass
UF-8001G ・・・17.14 parts by mass Photo radical polymerization initiator: Irgacure 184 ・・・2.86 parts by mass Solvent: MEK ・・・40 parts by mass

<Example 12>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 46 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 18% and good tensile properties.
-Acrylic resin: Urethane acrylate A... 38.18 parts by mass
UF-8001G: 16.37 parts by mass Photo-radical polymerization initiator: Irgacure 184: 5.45 parts by mass Solvent: MEK: 40 parts by mass

<Example 13>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 52 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 22% and good tensile properties.
・Acrylic resin: Urethane acrylate A 41.59 parts by mass
UF-8001G: 17.82 parts by mass Photo radical polymerization initiator: ESACURE ONE: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Example 14>
A photocurable resin molded body was produced in the same manner as in Example 1 except that the thickness of the photocurable resin molded body was 10 μm, and the tensile properties were evaluated. The maximum stress was 50 N/mm ² , It was possible to obtain a photocurable resin molded product having an elongation of 23% and good tensile properties.

<Example 15>
A photocurable resin molded body was prepared in the same manner as in Example 1 except that the thickness of the photocurable resin molded body was 80 μm, and the tensile properties were evaluated. The maximum stress was 56 N/mm ² , It was possible to obtain a photocurable resin molded product having an elongation of 20% and good tensile properties.

<Example 16>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 58 N/mm ^2. It was possible to obtain a photocurable resin molded product having a tensile elongation of 16% and good tensile properties.
-Acrylic resin: Urethane acrylate A... 47.53 parts by mass
UF-8001G: 11.88 parts by mass Photo-radical polymerization initiator: Irgacure 184: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Example 17>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 45 N/mm ^2. Thus, it was possible to obtain a photocurable resin molded product having a tensile elongation of 20% and good tensile properties.
-Acrylic resin: Urethane acrylate A... 11.88 parts by mass
UF-8001G: 47.53 parts by mass Photo-radical polymerization initiator: Irgacure 184: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Comparative Example 1>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 55 N/mm ^2. Since the tensile elongation was 12%, a photocurable resin molding having a sufficient tensile elongation could not be obtained.
-Acrylic resin: Epoxy ester 3002A... 37.5 parts by mass
Purple UV-7000B ・・・16.1 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・6.4 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Comparative example 2>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 55 N/mm ^2. Since the tensile elongation was 13%, a photocurable resin molding having a sufficient tensile elongation could not be obtained.
-Acrylic resin: Urethane acrylate A... 37.5 parts by mass
Purple UV-7000B ・・・16.1 parts by mass ・Radical radical polymerization initiator: Irgacure 184 ・・・6.4 parts by mass ・Solvent: MEK ・・・40 parts by mass

<Comparative example 3>
An attempt was made to produce a photocurable resin molded article in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, but UA-306H had 6 functional groups. However, the photocurable resin molded body was fragile and ruptured during winding, so that the photocurable resin molded body could not be obtained.
-Acrylic resin: UA-306H... 41.59 parts by mass
UF-8001G: 17.82 parts by mass Photo-radical polymerization initiator: Irgacure 184: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Comparative example 4>
An attempt was made to prepare a photocurable resin molded body in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, but A-TMMT had four functional groups. However, the photocurable resin molded body was fragile and ruptured during winding, so that the photocurable resin molded body could not be obtained.
-Acrylic resin: A-TMMT... 41.59 parts by mass
UF-8001G: 17.82 parts by mass Photo-radical polymerization initiator: Irgacure 184: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Comparative Example 5>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 55 N/mm ^2. Since the tensile elongation was 13%, a photocurable resin molding having a sufficient tensile elongation could not be obtained.
-Acrylic resin: urethane acrylate A... 50.50 parts by mass
UF-8001G ・・・8.91 parts by mass Photo radical polymerization initiator: Irgacure 184 ・・・0.59 parts by mass Solvent: MEK ・・・40 parts by mass

<Comparative example 6>
A photocurable resin molding was prepared in the same manner as in Example 1 except that the composition for photocurable resin molding had the following composition, and the tensile properties were evaluated. The maximum stress was 40 N/mm ^2. Since the tensile elongation was 25%, it was not possible to obtain a photocurable resin molded body having sufficient tensile strength.
-Acrylic resin: Urethane acrylate A... 8.91 parts by mass
UF-8001G: 50.50 parts by mass Photo radical polymerization initiator: Irgacure 184: 0.59 parts by mass Solvent: MEK: 40 parts by mass

<Comparative Example 7>
An attempt was made to prepare a photocurable resin molded body in the same manner as in Example 1 except that the thickness of the photocurable resin molded body was 8 μm. For this reason, the photocurable resin molded body could not be obtained because breakage occurred during winding.

<Comparative Example 8>
An attempt was made to prepare a photocurable resin molded body in the same manner as in Example 1 except that the thickness of the photocurable resin molded body was 105 μm, but due to insufficient internal curing of the photocurable resin molded body, Since it was difficult to wind the film, a photocurable resin molding could not be obtained.

  Table 1 shows the photocurable resin molding compositions used in Examples and Comparative Examples. Table 2 shows the film thickness and the tensile properties of the photocurable resin molding thus produced.

  From Table 1, it was confirmed that the photocurable resin molded products according to Examples 1 to 17 were excellent in strength and extensibility.

  The photocurable resin molded product according to the present invention can be used as a protective film for optical devices such as polarizing plates and transmissive liquid crystal displays.

Claims (3)

A photocurable resin molded article comprising a photocurable film of a coating liquid containing an ultraviolet curable monomer and an ultraviolet polymerization initiator,
The UV-curable monomer has a (meth)acryloyl group, and the double bond reaction rate represented by the following formula (1) is 20% or more and less than 60% (meth)acrylate A and (meth)acryloyl. A (meth)acrylate B having a group and having a double bond reaction rate represented by the following formula (1) of 60% or more and less than 95%,
The mass ratio of the (meth)acrylate A and the (meth)acrylate B is 20 to 80:80 to 20,
Maximum stress in the tensile properties of the photocurable resin molded article is not less 45N / mm ² or more state, and are tensile elongation is 15% or more represented by the following formula (2),
The thickness of the photocurable resin molded body, characterized in 10~100μm der Rukoto photocurable resin molding.
Double bond reaction rate (%)=100×{1-(P0-P1)} Equation (1)
Tensile elongation (%)=100×{(length at break)-(initial length before tensile test)}/initial length before tensile test... Formula (2)
here,
P0: peak intensity of the absorption of 810 cm ^-1 in the infrared absorption spectrum before photocuring the coating liquid P1: the peak intensity of the absorption of 810 cm ^-1 in the infrared absorption spectrum after photocuring the coating liquid is there. A polarizing plate comprising the photocurable resin molding according to claim 1 . A transmissive liquid crystal display comprising the photocurable resin molding according to claim 1 .