JP6600941B2 - Photo-curable resin molded body, polarizing plate using the same, and transmissive liquid crystal display - Google Patents

Description

  INDUSTRIAL APPLICABILITY The present invention can be used as a protective film for liquid crystal display devices, plasma display devices, electrochromic display devices, light emitting diode display devices, EL display devices, display device parts such as touch panels, and can also be used as a functional film. The present invention relates to a photocurable resin molded body, a polarizing plate using the same, and a transmissive liquid crystal display.

  Resin layers are formed on protective films for polarizing plates used in liquid crystal displays, organic EL displays and the like in order to have various functions. Examples of the resin layer include an antistatic layer for imparting an antistatic function, an antireflection layer for suppressing reflection, and a hard coat layer for improving surface hardness. In particular, the hard coat layer is indispensable for liquid crystal display applications and is used not only as a single layer but also as a lower layer of an antireflection layer.

  In recent years, there have been many demands for film thickness reduction. When thinning a film, examination etc. which apply | coat the adhesion layer for improving impact resistance to the base layer film which consists of an optical function film for liquid crystal displays are made | formed (for example, refer patent document 1).

  On the other hand, in a liquid crystal display device, it is desired to use a base film having a thickness of about half of the conventional thickness (about 60 to 120 μm) for the hard coat film. When a conventional hard coat layer is formed on such a thin substrate, a large curl is generated in the hard coat film due to curing shrinkage of the hard coat layer.

  Therefore, in order to obtain a film having high hardness and low curl, various hard coat treated products prepared using a compound containing a bulky skeleton and an aromatic ring have been studied (for example, see Patent Documents 2 and 3). .

  In Patent Document 2, a hard coat treatment in which a curable composition containing a compound having three or more ethylenically unsaturated groups and one or more isocyanurate rings in the same molecule is applied onto a substrate and cured. The product is disclosed. The photocrosslinkable polymer used in the polymerization in Patent Document 2 is a solid or a high-viscosity liquid and is difficult to apply alone, so it is usually dissolved in an organic solvent and applied. Patent Document 3 uses a coating liquid for forming a hard coat layer that includes a solvent, an ultraviolet curable substance and an ultraviolet polymerization initiator, and uses an aromatic ring compound as the ultraviolet curable substance. Is disclosed.

JP 2007-156066 A JP 2004-141732 A JP 2014-134673 A

  As described above, in order to make a curable composition into a coating liquid, the viscosity is reduced using a solvent. However, when a solvent is used in the coating liquid, the environment caused by the discharge of volatile organic compounds (VOC). There are concerns about the impact on the film, the necessity of large equipment required for drying, and the influence of the solvent remaining inside the film on the film properties.

  In order to solve the above-mentioned problems, it is required to design a solvent-free coating solution. is there.

  An object of this invention is to provide the photocurable resin formation body which can make a film | membrane characteristic and surface property make compatible, a polarizing plate using the same, and a transmissive liquid crystal display.

The present invention is a photocurable resin molded product obtained by photocuring a photopolymerizable composition, the photopolymerizable composition contains a photocurable resin and an ultraviolet polymerization initiator, and a solvent. The photo-curable resin is composed of one acrylate (A) having 2 or 3 (meth) acryloyl groups and one acrylate (B) having 1 or 2 (meth) acryloyl groups. The weight ratio of acrylate (A) to acrylate (B) is 70:30 to 80:20, and acrylate (B) contains one or more cyclic structures or one or more aromatic rings, and ether has a skeleton, thickness state, and are more 50μm or less 15 [mu] m, and a tensile strength of the photocurable resin molded product 30 N / mm ² or more, a viscosity at 25 ° C. of the photopolymerizable composition is 50 mPa · s or more 600 mP · S Ru der below.

Further, it is preferable tensile elongation as defined under Symbol formula (I) of the photocurable resin molded article is 10% or more.
Tensile elongation (%) = {(length at break) − (initial length before tension)} × 100 / initial length before tension
... Formula (I)

  In addition, the photocurable resin molded body can be used for polarizing plates, transmissive liquid crystal displays, and the like.

  ADVANTAGE OF THE INVENTION According to this invention, the photocurable resin formation body which can make film characteristics and planarity compatible, a polarizing plate using the same, and a transmissive liquid crystal display are realizable.

As a result of intensive studies by the inventors of the present application, the photopolymerizable composition contains a photocurable resin and an ultraviolet polymerization initiator, does not contain a solvent, and has two or three (meth) photocurable resins. It consists of acrylate (A) having an acryloyl group and acrylate (B) having one or two (meth) acryloyl groups, and the weight ratio of acrylate (A) to acrylate (B) is from 30:70 to 90:10 The acrylate (B) has been invented a photo-curable resin molded product characterized in that it contains one or more cyclic structures or one or more aromatic rings and has an ether skeleton. In addition, a photocurable resin molded body having a tensile strength of 30 N / mm ² or more and a tensile elongation of 10% or more was invented. For example, a coating solution obtained by stirring and mixing the photopolymerizable composition having a viscosity at 25 ° C. of 50 mPa · s or more and 600 mPa · s or less is applied to a support such as a film or metal body with a cured film thickness of 15 μm or more and 50 μm or less. The photocurable resin molded product obtained by processing and peeling after irradiation with ultraviolet rays can achieve both film characteristics and surface properties.

  The photo-curable resin (photo-curable substance) used in the present invention refers to a resin whose main component is a resin that is cured through a crosslinking reaction by irradiation with active rays such as ultraviolet rays and electron beams.

  Further, in the present specification, acrylate and / or methacrylate are represented as (meth) acrylate, and acryloyl group and / or methacryloyl group are represented as (meth) acryloyl group.

  As the photocurable resin used in the present invention, a (meth) acrylate monomer can be used. As the acrylate (A) having 2 or 3 (meth) acryloyl groups, Aronix M-6100 (Toagosei Co., Ltd.), Shikou UV7000B (Nippon Synthetic Chemical Industry), Aronix M-208 (Toagosei), Aronix M-211B (Toagosei) etc. can be used.

  Examples of the acrylate (B) having one or two (meth) acryloyl groups include ACMO (KJ Chemicals), Aronix M-106 (Toagosei), Light acrylate DCP-4EO-A (Kyoeisha Chemical), AMP-20GY ( Shin Nakamura Chemical), Aronix M-110S (Toagosei), Light acrylate POB-A (Kyoeisha Chemical), Light Ester PO (Kyoeisha Chemical) and the like can be used.

  A monomer of (meth) acrylate containing an aromatic ring or a cyclic structure and having an ether skeleton imparts a property excellent in the balance between strength and elongation to the photocurable resin molded article.

  In addition, the ultraviolet polymerization initiator used for the coating liquid in the present invention is not particularly limited, but Irgacure 184 with particularly little coloration can be used in curing the transparent resin. Further, α-hydroxy ketones which are surface-curing polymerization initiators such as 1-hydroxycyclohexyl phenyl ketone, 2-hydroxy-2-methyl-1-phenylpropan-1-one, 1- [4- (2- Hydroxyethoxy) -phenyl] -2-hydroxy-2-methyl-1-propan-1-one, the α-aminoketone 2-methyl-1- (4-methylthiophenyl) -2-morpholinopro with high molar extinction coefficient Pan-1-one, acyl phosphine oxide which is an internal curing polymerization initiator, for example, bis (2,4,6-trimethylbenzoyl) -phenyl phosphine oxide, α-aminoketone having an absorption region in h-line, For example, 2-benzyl-2-dimethylamino-1- (4-morpholinophenyl) -butanone-1 is appropriately combined. It may be used together.

  In addition to those shown above, for example, among acetophenones, benzoins, benzophenones, phosphine oxides, ketals, anthraquinones, thioxanthones, etc., there are characteristics of surface curing systems and internal curing systems Any initiator can be selected as appropriate.

  The amount of the ultraviolet polymerization initiator used is preferably 0.5 to 15% by weight based on the total solid content of the photocurable resin, and the film hardness tends to be low even if it is more or less than this range. In particular, when the amount is too large, the coating film may be colored.

  In addition, n-butylamine, triethylamine, poly-n-butylphosphine, or the like may be used as a photosensitizer.

  In the present invention, as the support used for curing the photopolymerizable composition, a roll-shaped metal body, polyethylene terephthalate (PET film), or the like can be used. After applying the photopolymerizable composition to the support, if the resin molded body cured after ultraviolet curing can be easily peeled without deformation of the support in a process such as ultraviolet curing, the material of the support is It is not particularly limited.

  To the paint prepared by stirring and mixing the photocurable resin and the ultraviolet polymerization initiator, additives for imparting antifouling properties, slipperiness, defect prevention, and particle dispersibility may be added. For example, polyether-modified polymethylalkylsiloxane, polyether-modified polydimethylsiloxane, fluorine-modified polymer, acrylic copolymer, polyester-modified acrylic-containing polydimethylsiloxane, silicon-modified polyacryl, and the like can be used.

  Moreover, a well-known method can be used as the coating method of the said coating material to the support body. Specifically, bar coating, dip coating, spin coating, flow coating, spray coating, roll coating, gravure roll coating, air doctor coating, blade coating, wire doctor coating, knife coating Methods, reverse coating method, transfer roll coating method, micro gravure coating method, kiss coating method, cast coating method, slot orifice coating method, calendar coating method, die coating method and the like can be used.

The light source for curing the photocurable resin by a photocuring reaction to form a cured film is not particularly limited as long as it is a light source that generates ultraviolet rays. 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, or the like can be used. As irradiation conditions, the ultraviolet irradiation amount can be set to 100 to 800 mJ / cm ² .

  The photocurable resin molded product obtained by coating the above-mentioned coating material on a support, irradiating ultraviolet rays, and then peeling off the photocured resin molded product has anti-blocking, hardness imparting, antiglare property and antistatic performance. Fine particles of inorganic or organic compounds can be included for imparting or adjusting the refractive index.

  As inorganic fine particles used, oxides such as silicon oxide, titanium oxide, aluminum oxide, zirconium oxide, magnesium oxide, tin oxide, and antimony pentoxide, and composite oxides such as antimony-doped tin oxide and phosphorus-doped tin oxide should be used. Can do. In addition, calcium carbonate, talc, clay, kaolin, calcium silicate, aluminum silicate, magnesium silicate, calcium phosphate, and the like can be used.

  The organic fine particles include polymethyl methacrylate acrylate resin powder, acrylic-styrene resin powder, polymethyl methacrylate resin powder, silicon resin powder, polystyrene powder, polycarbonate powder, melamine resin powder, polyolefin resin powder, etc. Can be used.

  The average particle size of these fine particle powders is preferably 5 nm to 20 μm, and more preferably 10 nm to 10 μm. These fine particles can be used in combination of two or more.

  The photo-curable resin molded product (photo-curable resin film) obtained in the present invention has antireflection performance, antistatic performance, antifouling performance, antiglare performance, electromagnetic wave shielding performance, infrared absorption performance, ultraviolet rays as necessary. A functional layer having absorption performance, color correction performance, or the like may be laminated. The functional layer 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 by repeating a low refractive index layer and a high refractive index layer. In addition, this functional layer may have a plurality of functions in one layer, for example, an antireflection layer having antifouling performance.

  As described above, according to the photocurable resin molded body according to the present invention, the photocurable resin includes one or more cyclic structures or one or more aromatic rings and has an ether skeleton. By being a monofunctional resin or a bifunctional resin, it becomes possible to obtain a tough photocurable resin molded product (photocurable resin film). Moreover, since the photocurable resin molding (photocurable resin film) itself according to the present invention can be used as a hard coat film, the hard coat film can be thinned. In addition, the mechanical characteristics are improved, the workability and the conveyance efficiency in the manufacturing process are improved, and it can be mounted on a polarizing plate or a transmissive liquid crystal display.

  Moreover, since the photocurable resin used for the photocurable resin molding (photocurable resin film) according to the present invention has a low resin viscosity and does not need to be made into a solution using a diluting solvent, a volatile organic compound ( Films with good surface quality without impact on the environment due to VOC emissions and on the film properties due to the solvent remaining inside the film, and without the need for installation of large-scale drying equipment Can be obtained.

  Specific examples of the present invention will be described below. However, the present invention is not limited to the following examples.

(1) Tensile property test 100 mm × 15 mm from the photocurable resin films obtained in Example 1 , Example 2, Example 5 to Example 12 , Reference Example 3, Reference Example 4 and Comparative Example 1 to Comparative Example 4. A strip-shaped film sample was formed, and the test was performed using a small tabletop testing machine EZ-L manufactured by Shimadzu Corporation with a distance between chucks of 50 mm at the start of measurement and a tensile speed of 5 mm / min. The tensile elongation was calculated using the formula (I).
Tensile elongation (%) = {(length at break) − (initial length before tension)} × 100 / initial length before tension
... Formula (I)

(2) Viscosity Using a Thermo HAAKE Viscotester 550 (visco tester) rotary viscometer, the viscosity at 25 ° C. and a shear rate of 100 s ⁻¹ was measured.

<Example 1>
Aronix M-6100 (Toagosei Co., Ltd.) 66.67 parts by weight ACMO (KJ Chemicals) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition was added to a PET film ( Lumirror T60-75myuemu: the coating is a cured film thickness of 40μm by a bar coating method Toray) was irradiated with ultraviolet rays of 400 mJ / cm ² by a metal halide lamp, and separating the light cured coating, the photocurable resin formed Got the body. This photocurable resin molding (film) had a tensile strength of 65 N / mm ² and a tensile elongation of 20%, and a film having good tensile properties and surface properties could be formed.

<Example 2>
Aronix M-6100 (Toagosei) 66.67 parts by weight Aronix M-106 (Toagosei) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition, A PET film (Lumirror T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 45 μm, irradiated with UV light of 400 mJ / cm ² with a metal halide lamp, the photocured coating film was peeled off, and photocured. A functional resin formed body was obtained. The photocurable resin molded body (film) had a tensile strength of 30 N / mm ² and a tensile elongation of 40%, and a film having good tensile properties and surface properties could be formed.

< Reference Example 3>
Purple light UV7000B (Nippon Synthetic Chemical Industry) 28.57 parts by weight ACMO (KJ Chemicals) 66.67 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition was added to a PET film ( Lumirror T60-75myuemu: the coating is a cured film thickness of 40μm by a bar coating method Toray) was irradiated with ultraviolet rays of 400 mJ / cm ² by a metal halide lamp, and separating the light cured coating, the photocurable resin formed Got the body. This photocurable resin molded product (film) had a tensile strength of 70 N / mm ² and a tensile elongation of 80%, and a film having good tensile properties and surface properties could be formed.

< Reference Example 4>
Purple light UV7000B (Nippon Synthetic Chemical Industry) 28.57 parts by weight ACMO (KJ Chemicals) 66.67 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition was added to a PET film ( Lumirror T60-75myuemu: the coating is a cured film thickness of 15μm by a bar coating method Toray) was irradiated with ultraviolet rays of 400 mJ / cm ² by a metal halide lamp, and separating the light cured coating, the photocurable resin formed Got the body. The photocurable resin molded body (film) had a tensile strength of 40 N / mm ² and a tensile elongation of 15%, and a film having good tensile properties and surface properties could be formed.

<Example 5>
Aronix M-208 (Toagosei) 66.67 parts by weight Aronix M-106 (Toagosei) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition, A PET film (Lumirror T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 45 μm, irradiated with UV light of 400 mJ / cm ² with a metal halide lamp, the photocured coating film was peeled off, and photocured. A functional resin formed body was obtained. This photocurable resin molding (film) had a tensile strength of 40 N / mm ² and a tensile elongation of 30%, and a film having good tensile properties and surface properties could be formed.

<Example 6>
Aronix M-208 (Toagosei Co., Ltd.) 76.19 parts by weight Light acrylate DCP-4EO-A (Kyoeisha Chemical) 19.05 parts by weight Irgacure 184 (BASF) 4.76 parts by weight The above composition was stirred and mixed. The liquid was applied to a PET film (Lumirror T60-75 μm: Toray) with a bar coating method to a cured film thickness of 40 μm, irradiated with 400 mJ / cm ² ultraviolet rays with a metal halide lamp, and the photocured coating film was peeled off. A photocurable resin formed body was obtained. This photocurable resin molding (film) had a tensile strength of 30 N / mm ² and a tensile elongation of 20%, and a film having good tensile properties and surface properties could be formed.

<Example 7>
Aronix M-211B (Toagosei) 76.19 parts by weight AMP-20GY (Shin Nakamura Chemical) 19.05 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A PET film (Lumirror T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 42 μm, irradiated with UV light of 400 mJ / cm ² with a metal halide lamp, the photocured coating film was peeled off, and photocured. A functional resin formed body was obtained. This photocurable resin molded body (film) had a tensile strength of 40 N / mm ² and a tensile elongation of 11%, and a film having good tensile properties and surface properties could be formed.

<Example 8>
Aronix M-211B (Toagosei) 66.67 parts by weight Aronix M-106 (Toagosei) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition, A PET film (Lumirror T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 40 μm, irradiated with 400 mJ / cm ² of ultraviolet light with a metal halide lamp, the photocured coating film was peeled off, and photocured. A functional resin formed body was obtained. The photocurable resin molded body (film) had a tensile strength of 50 N / mm ² , a tensile elongation of 10%, and was able to form a film having good tensile properties and surface properties.

<Example 9>
Aronix M-211B (Toagosei) 66.67 parts by weight Aronix M-110S (Toagosei) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A PET film (Lumirror T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 45 μm, irradiated with UV light of 400 mJ / cm ² with a metal halide lamp, the photocured coating film was peeled off, and photocured. A functional resin formed body was obtained. The photocurable resin molded body (film) had a tensile strength of 50 N / mm ² , a tensile elongation of 10%, and was able to form a film having good tensile properties and surface properties.

<Example 10>
Aronix M-211B (Toagosei Co., Ltd.) 66.67 parts by weight Light acrylate POB-A (Kyoeisha Chemical Co., Ltd.) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition , Applied to a PET film (Lumirror T60-75 μm: Toray) with a bar coating method to a cured film thickness of 40 μm, irradiated with 400 mJ / cm ² ultraviolet rays with a metal halide lamp, peeled off the photocured coating film, A curable resin formed body was obtained. The photocurable resin molded body (film) had a tensile strength of 50 N / mm ² , a tensile elongation of 10%, and was able to form a film having good tensile properties and surface properties.

<Example 11>
Aronix M-211B (Toagosei) 66.67 parts by weight Light Ester PO (Kyoeisha Chemical) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight It is applied to a film (Lumirror T60-75 μm: Toray) with a bar coating method to a cured film thickness of 40 μm, irradiated with 400 mJ / cm ² of ultraviolet light with a metal halide lamp, the photocured coating film is peeled off, and photocurability A resin formed body was obtained. This photocurable resin molding (film) had a tensile strength of 40 N / mm ² and a tensile elongation of 15%, and a film having good tensile properties and surface properties could be formed.

<Example 12>
Aronix M-211B (Toagosei Co., Ltd.) 66.67 parts by weight Light acrylate DCP-4EO-A (Kyoeisha Chemical Co., Ltd.) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight The above composition was stirred and mixed. The liquid was applied to a PET film (Lumirror T60-75 μm: Toray) with a bar coating method to a cured film thickness of 45 μm, irradiated with 400 mJ / cm ² of ultraviolet light with a metal halide lamp, and the photocured coating film was peeled off. A photocurable resin formed body was obtained. This photocurable resin molding (film) had a tensile strength of 40 N / mm ² and a tensile elongation of 20%, and a film having good tensile properties and surface properties could be formed.

<Comparative Example 1>
Aronix M-6100 (Toagosei Co., Ltd.) 76.19 parts by weight A-TMPT-3EO (Shin Nakamura Chemical Co., Ltd.) 19.05 parts by weight Irgacure 184 (BASF) 4.76 parts by weight The above composition was stirred and mixed. Is applied to a PET film (Lumirror T60-75 μm: Toray) by a bar coating method to a cured film thickness of 45 μm, irradiated with 400 mJ / cm ² of ultraviolet rays with a metal halide lamp, and the photocured coating film is peeled off. A photocurable resin formed body was obtained. The tensile strength of this photocurable resin molding (film) was 50 N / mm ² and the tensile elongation was 3%. A-TMPT-3EO, which is an acrylate (B), is a trifunctional acrylate, so it is difficult to balance strength and elongation, curling occurs due to curing shrinkage, and a film is formed that is cracked due to hardness even during peeling. It was done.

<Comparative Example 2>
Violet UV7000B (Nippon Synthetic Chemical Industry) 28.57 parts by weight ACMO (KJ Chemicals) 66.67 parts by weight Irgacure 184 (BASF) 4.76 parts by weight of the mixed coating solution was mixed with a PET film (Lumirror T60-75 μm). : Toray) was applied by a bar coating method so as to have a cured film thickness of 100 μm, irradiated with 400 mJ / cm ² of ultraviolet rays with a metal halide lamp, and the photocured coating film was peeled off to obtain a photocurable resin formed body. . The tensile strength of this photocurable resin molded product (film) was 20 N / mm ² and the tensile elongation was 80%. Since the film thickness was 100 μm, curing did not progress uniformly to the inside of the film, and a low-strength film was formed.

<Comparative Example 3>
Aronix M-208 (Toagosei) 9.52 parts by weight Aronix M-106 (Toagosei) 85.72 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A coating solution obtained by stirring and mixing the above composition, A PET film (Lumirror T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 40 μm, irradiated with 400 mJ / cm ² of ultraviolet light with a metal halide lamp, the photocured coating film was peeled off, and photocured. A functional resin formed body was obtained. The tensile strength of this photocurable resin molding (film) was 10 N / mm ² and the tensile elongation was 60%. Since the amount of Aronix M-106, which is an acrylate (B), is as large as 90%, a film having low strength was formed.

<Comparative Example 4>
Aronix M-211B (Toagosei) 66.67 parts by weight light ester BZ (Kyoeisha Chemical) 28.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight A film (Lumilar T60-75 μm: Toray) was applied by a bar coating method to a cured film thickness of 45 μm, irradiated with 400 mJ / cm ² ultraviolet rays with a metal halide lamp, the photocured coating film was peeled off, and photocurability was obtained. A resin formed body was obtained. The tensile strength of this photocurable resin molded product (film) was 50 N / mm ² and the tensile elongation was 5%. Since light ester BZ having no ether skeleton was used in acrylate (B), a film having low elongation characteristics was formed.

<Comparative Example 5>
Aronix M-211B (Toagosei Co., Ltd.) 86.67 parts by weight Light acrylate DCP-4EO-A (Kyoeisha Chemical) 8.57 parts by weight Irgacure 184 (BASF) 4.76 parts by weight The above composition was stirred and mixed. The liquid was applied to a PET film (Lumirror T60-75 μm: Toray) with a bar coating method to a cured film thickness of 45 μm, irradiated with 400 mJ / cm ² of ultraviolet light with a metal halide lamp, and the photocured coating film was peeled off. A photocurable resin formed body was obtained. The tensile strength of this photocurable resin molded body (film) was 60 N / mm ² and the tensile elongation was 2%. Since the ratio of high-viscosity M-211B was 91% and the coating liquid viscosity was as high as 1000 mPa · s, streaky unevenness was observed in the film.

The evaluation results of the above Example 1 , Example 2, Example 5 to Example 12 , Reference Example 3, Reference Example 4 and Comparative Example 1 to Comparative Example 5 are shown together in Table 1.

When comparing Example 1 , Example 2, Example 5 to Example 12 , Reference Example 3, Reference Example 4 and Comparative Examples 1 to 5, one or more ring structures or one or more fragrances In Example 1 , Example 2, Example 5 to Example 12 , Reference Example 3, and Reference Example 4 in which a monofunctional resin or a bifunctional resin containing a ring and having an ether skeleton was used at a predetermined weight ratio, It can be seen that it is possible to achieve both film characteristics and surface properties.

  The photocurable resin molded product (photocurable resin film) according to the present invention is a thin film because it does not include a base material layer, and the liquid crystal display can be reduced in weight and thickness.

  Moreover, since the photocurable resin molding (photocurable resin film) according to the present invention has good tensile properties, it can be expected to improve workability in the manufacturing process.

  The photocurable resin molded product (photocurable resin film) according to the present invention is a display device such as a liquid crystal display device, a plasma display device, an electrochromic display device, a light emitting diode display device, an EL display device, or a touch panel. It can be used as a protective film for functional parts or a functional film.

Claims (4)

A photocurable resin molding obtained by photocuring a photopolymerizable composition,
The photopolymerizable composition contains a photocurable resin and an ultraviolet polymerization initiator, and does not contain a solvent.
The photocurable resin is composed of one acrylate (A) having 2 or 3 (meth) acryloyl groups and one acrylate (B) having 1 or 2 (meth) acryloyl groups,
The weight ratio of the acrylate (A) to the acrylate (B) is 70:30 to 80:20,
The acrylate (B) includes one or more cyclic structures or one or more aromatic rings, and has an ether skeleton,
Thick state, and are more 50μm or less 15 [mu] m,
The tensile strength of the photocurable resin molding is 30 N / mm ² or more,
Viscosity at 25 ℃ is characterized by the following der Rukoto 50 mPa · s or higher 600 mPa · s, photocurable resin molded article of the photopolymerizable composition. And a tensile elongation as defined under Symbol formula (I) is 10% or more, photo-curable resin molded article according to claim 1.
Tensile elongation (%) = {(length at break) − (initial length before tension)} × 100 / initial length before tension
... Formula (I) A polarizing plate provided with the photocurable resin molding of Claim 1 or 2 . Comprising a photocurable resin molded article according to claim 1 or 2, transmission type liquid crystal display.