WO2020100468A1 - Stratifié optique et dispositif d'affichage d'image le comprenant - Google Patents

Stratifié optique et dispositif d'affichage d'image le comprenant Download PDF

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Publication number
WO2020100468A1
WO2020100468A1 PCT/JP2019/039675 JP2019039675W WO2020100468A1 WO 2020100468 A1 WO2020100468 A1 WO 2020100468A1 JP 2019039675 W JP2019039675 W JP 2019039675W WO 2020100468 A1 WO2020100468 A1 WO 2020100468A1
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WIPO (PCT)
Prior art keywords
layer
mpa
front plate
thickness
film
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PCT/JP2019/039675
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English (en)
Japanese (ja)
Inventor
光 出▲崎▼
龍源 徐
大山 姜
東輝 金
ジュンソク 金
Original Assignee
住友化学株式会社
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Priority claimed from JP2019120237A external-priority patent/JP7300906B2/ja
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020217012594A priority Critical patent/KR20210091136A/ko
Priority to CN201980074493.4A priority patent/CN113015928B/zh
Publication of WO2020100468A1 publication Critical patent/WO2020100468A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/02—Physical, chemical or physicochemical properties
    • B32B7/023—Optical properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
    • G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
    • G09F9/00—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements
    • G09F9/30—Indicating arrangements for variable information in which the information is built-up on a support by selection or combination of individual elements in which the desired character or characters are formed by combining individual elements

Definitions

  • the present invention relates to an optical laminate and an image display device including the same.
  • the flexible front plate has a problem that the impact resistance is not sufficient as compared with the cover glass used as the front plate of the image display device having no flexibility.
  • the present invention is to provide an optical laminate having excellent impact resistance while having good flexibility suitable for a flexible display, and an image display device including the same.
  • the present invention provides the following optical laminate and an image display device including the same.
  • An optical laminate comprising a front plate, a circularly polarizing plate, and a first bonding layer for bonding the front plate and the circularly polarizing plate,
  • the circularly polarizing plate includes a linear polarizing plate and a retardation layer in order from the first bonding layer side
  • the front plate includes an outer layer that forms the outermost surface of the optical layered body, and an inner layer that is provided so as to contact the outer layer and the first bonding layer,
  • the outer layer is a first resin film
  • the inner layer has a thickness of 100 ⁇ m or less
  • the optical layered body has a withstand load of 20 g or more in a ball drop test.
  • the front plate has the following formula: (1) and equation (2): 2000 nm ⁇ R0 (550) ⁇ 15000 nm (1) 5000 nm ⁇ Rth (550) ⁇ 15000 nm (2)
  • the optical laminate according to [1] which satisfies the relationship of
  • the product of the tensile elastic modulus of the inner layer at a temperature of 23 ° C. and a relative humidity of 55% and the thickness of the inner layer is 80 MPa ⁇ mm or more and 700 MPa ⁇ mm or less.
  • the product of the tensile elastic modulus of the outer layer at a temperature of 23 ° C. and a relative humidity of 55% and the thickness of the outer layer is 100 MPa ⁇ mm or more and 800 MPa ⁇ mm or less.
  • optical layered body according to any one of [1] to [8], wherein the optical layered body has a limit bending number of 100,000 times or more in a bending test.
  • An image display device comprising the optical laminate according to any one of [1] to [10], and the front plate is arranged on the front surface.
  • optical layered body of the present invention it is possible to provide an image display device having excellent impact resistance while having good flexibility suitable for a flexible display.
  • FIG. 1 is a schematic cross-sectional view schematically showing an example of the optical layered body of the present embodiment.
  • the optical laminate 100 includes a front plate 10, a circularly polarizing plate 30, and a first bonding layer 20, and as shown in FIG. 1, the front plate 10, the first bonding layer 20, and the first bonding layer 20 in order from the viewing side.
  • a circular polarization plate 30 is provided.
  • the first bonding layer 20 is a layer for bonding the front plate 10 and the circularly polarizing plate 30.
  • the front plate 10 includes an outer layer 11 that forms the outermost surface of the optical layered body 100, and an inner layer 12 that is provided in contact with the outer layer 11 and the first bonding layer 20.
  • the circular polarization plate 30 includes a linear polarization plate 31 and a retardation layer 32 in order from the first bonding layer 20 side.
  • the optical laminate 100 can form an image display device as described later. Further, since the optical layered body 100 includes the circularly polarizing plate 30, it can be used as an antireflection film.
  • the outer layer 11 of the front plate 10 is the first resin film, and the inner layer has a thickness of 100 ⁇ m or less, so that the image display device (flexible display) that can be bent or wound is provided. Can be used for.
  • the optical layered body 100 preferably has flexibility such that the limit number of bends required in the bendability test in Examples described later is 100,000 or more, and the limit number of bends is more preferably 150,000 or more. More preferably, it is 200,000 times or more. Thereby, the optical laminated body 100 can be suitably applied to a flexible display.
  • the flexibility test can be carried out by the method of Examples described later.
  • polarized sunglasses Light that is incident from the circularly polarizing plate 30 side of the optical laminate 100, is emitted from the front plate 10 side, and is transmitted through the polarized sunglasses) exhibits a specific transmission color according to the phase difference value of the front plate. This allows the displayed image to be viewed even through the polarized sunglasses.
  • the image display device having the front plate having R0 (550) and Rth (550) of less than 10 nm includes the linear polarizing plate
  • the linear polarizing plate absorbs the light.
  • the brightness is greatly reduced, and a phenomenon called blackout occurs in which the displayed image is hard to see.
  • the withstand load in the ball drop test of the optical layered body 100 is 20 g or more, preferably 21 g or more, more preferably 22 g or more, and may be 25 g or more, usually 50 g or less, 40 g It may be the following.
  • excellent impact resistance can be imparted to the optical layered body 100 even when the outer layer 11 of the front plate 10 is the first resin film. Therefore, by using the optical laminate 100, it is possible to provide a flexible display having excellent impact resistance while having flexibility.
  • the withstand load in the ball drop test is measured by the method described in Examples below.
  • the withstand load of the optical layered body 100 in the ball drop test can be adjusted by the rigidity (tensile elastic modulus, thickness) of each layer forming the optical layered body 100, elongation at yield point, yield stress, and the like.
  • the rigidity of the inner layer 12 described later, the type of adhesive or adhesive forming the second bonding layer 12b described later contained in the inner layer 12, the thickness of the second bonding layer 12b, the first bonding layer 20 It can be adjusted depending on the type of adhesive or adhesive used, the thickness of the first bonding layer 20, and the like.
  • the reflectance is preferably 10% or less, more preferably 7% or less, and further preferably 5.5% or less.
  • the reflectance can be measured using a spectrocolorimeter (CM-2600d, manufactured by Konica Minolta, Inc.).
  • the thickness of the optical layered body 100 is not particularly limited, it is preferably 220 ⁇ m or less, more preferably 180 ⁇ m or less, further preferably 150 ⁇ m or less, so that good flexibility is exhibited, and usually , 40 ⁇ m or more, and may be 70 ⁇ m or more.
  • the shape of the optical layered body 100 in the surface direction is not particularly limited, but it is preferably a square shape, and more preferably a rectangular shape.
  • the length of the long side is preferably 50 mm to 500 mm, may be 100 mm to 400 mm, and the length of the short side is, for example, 30 mm to 400 mm. Is preferable, and may be 60 mm to 300 mm.
  • the optical layered body 100 may have a rounded rectangular shape in which at least one of the corners of the rectangular shape is rounded, or may have a rectangular shape having a cutout portion on at least one side. Further, the optical laminated body 100 may be provided with a hole penetrating in the laminating direction.
  • the front plate 10 includes an outer layer 11 that forms the outermost surface of the optical layered body 100, and an inner layer 12 that is provided so as to contact the outer layer 11 and the first bonding layer 20.
  • the front plate 10 is a plate that can transmit light.
  • the front plate 10 can function as a layer for protecting display elements and the like of the image display device.
  • the front plate 10 may have not only a function of protecting the front surface of the image display device but also a function as a touch sensor, a blue light cut function, and the like.
  • the front plate 10 may have a viewing angle adjusting function.
  • the front plate 10 when the in-plane retardation value of the front plate at a wavelength of 550 nm is R0 (550) and the thickness direction retardation value of the front plate at a wavelength of 550 nm is Rth (550), the front plate 10 has the following formula: (1) and equation (2): 2000 nm ⁇ R0 (550) ⁇ 15000 nm (1) 5000 nm ⁇ Rth (550) ⁇ 15000 nm (2) It is preferable to satisfy the relationship.
  • the image display device using the optical laminated body 100 through the polarized sunglasses can be viewed from the front direction and the oblique direction.
  • the in-plane retardation value R0 (550) of the front plate 10 is more preferably 2500 nm or more, further preferably 5000 nm or more.
  • the thickness direction retardation value Rth (550) of the front plate 10 is more preferably 8000 nm or more, further preferably 9000 nm or more, and further preferably 10000 nm or more.
  • the rigidity represented by the product of the tensile modulus of the front plate 10 at a temperature of 23 ° C. and a relative humidity of 55% and the thickness of the front plate 10 is preferably 100 MPa ⁇ mm or more, and 150 MPa ⁇ mm or more. May be 300 MPa ⁇ mm or more, preferably 5000 MPa ⁇ mm or less, preferably 4000 MPa ⁇ mm or less, and 3000 MPa ⁇ mm or less. Since the front plate 10 forms the outermost surface of the optical laminated body 100, if the rigidity of the front plate 10 decreases, it becomes difficult to obtain the surface protection function of the display panel and the like included in the image display device, and the rigidity of the front plate 10 increases. However, flexibility tends to decrease.
  • the tensile modulus of the front plate 10 at a temperature of 23 ° C. and a relative humidity of 55% is preferably 3000 MPa or more, more preferably 5000 MPa or more, and preferably 20000 MPa or less, and 15000 MPa or less. Is more preferable.
  • the tensile modulus of elasticity of the outer layer 11 at a temperature of 23 ° C. and a relative humidity of 55% can be measured by the method described in Examples below, and when the outer layer 11 has a retardation property, it is along the slow axis direction. It is the value measured by
  • the angle formed by the slow axis of the front plate 10 and the absorption axis of the linear polarizing plate 31 is preferably 0 ° or more, more preferably 30 ° or more, further preferably 35 ° or more, Further, it is preferably 65 ° or less, more preferably 60 ° or less, further preferably 55 ° or less, and most preferably 45 °.
  • the thickness of the front plate 10 is not particularly limited, but is preferably 250 ⁇ m or less, may be 200 ⁇ m or less, and is usually 40 ⁇ m or more so that good flexibility and good impact resistance can be exhibited. , 70 ⁇ m or more.
  • the outer layer 11 forming the front plate 10 serves as the outermost layer of the optical layered body 100.
  • the outer layer 11 has a function of imparting a surface hardness required for the optical layered body 100 and a function of protecting other layers laminated on the outer layer 11.
  • the first resin film forming the outer layer 11 is not limited as long as it can transmit light, and is a resin film in which a hard coat layer is provided on at least one surface of the base film to improve the surface hardness. May be.
  • the rigidity represented by the product of the tensile elastic modulus of the outer layer 11 at a temperature of 23 ° C. and a relative humidity of 55% and the thickness of the outer layer 11 is preferably 90 MPa ⁇ mm or more, and 100 MPa ⁇ mm or more. Is more preferable, 250 MPa ⁇ mm or more is more preferable, 2000 MPa ⁇ mm or less is preferable, 1200 MPa ⁇ mm or less is more preferable, 800 MPa ⁇ mm or less is further preferable, and 600 MPa is more preferable. -It may be less than or equal to mm.
  • the outer layer 11 forms the outermost surface of the optical layered body 100, if the rigidity of the outer layer 11 becomes small, it becomes difficult to obtain sufficient surface hardness of the optical layered body 100, and the abrasion resistance and the like tend to decrease. As the rigidity of the outer layer 11 increases, the flexibility tends to decrease.
  • the rigidity of the outer layer 11 is preferably higher than the rigidity of the inner layer 12, the rigidity of the first bonding layer 20, and the rigidity of the circularly polarizing plate 30.
  • the tensile elastic modulus of the outer layer 11 at a temperature of 23 ° C. and a relative humidity of 55% is preferably 3000 MPa or more, more preferably 5000 MPa or more, and preferably 20000 MPa or less and 15000 MPa or less. Is more preferable.
  • the tensile modulus of elasticity of the outer layer 11 at a temperature of 23 ° C. and a relative humidity of 55% can be measured by the method described in Examples below, and when the outer layer 11 has a retardation property, it is along the slow axis direction. It is the value measured by
  • the thickness of the outer layer 11 is usually 30 ⁇ m or more and may be 50 ⁇ m or more, and is usually 100 ⁇ m or less and may be 80 ⁇ m or less. When the thickness of the outer layer 11 is small, the impact resistance tends to decrease, and when the thickness of the outer layer 11 increases, the flexibility tends to decrease.
  • the first resin film forming the outer layer 11 may be a first retardation film having retardation characteristics.
  • the in-plane retardation value of the outer layer 11 at the wavelength of 550 nm may be, for example, 0 nm or more, may be 50 nm or more, may be 300 nm or less, and may be 200 nm or less.
  • the thickness direction retardation value of the outer layer 11 at a wavelength of 550 nm may be, for example, 0 nm or more, may be 100 nm or more, may be 3000 nm or less, and may be 2000 nm or less.
  • the first resin film is not limited as long as it is a resin film that can transmit light.
  • films formed of polymers such as terephthalate, polyethylene naphthalate, polycarbonate and polyamide imide.
  • the image display device 300 is a flexible display, it is formed of a polymer such as polyimide, polyamide, or polyamide-imide, which can be configured to have excellent flexibility, high strength, and high transparency.
  • the resin film is preferably used.
  • the first resin film may be a film in which a hard coat layer is provided on at least one surface of the base film to further improve the hardness.
  • the hard coat layer may be formed on one surface of the base film or may be formed on both surfaces.
  • a resin film having a hard coat layer is preferably used because the surface of the outer layer 11 serves as a touch surface.
  • the hard coat layer is, for example, a cured layer of an ultraviolet curable resin. Examples of the ultraviolet curable resin include (meth) acrylic resin, silicone resin, polyester resin, urethane resin, amide resin, and epoxy resin.
  • the hard coat layer may contain an additive in order to improve the strength.
  • the additive is not limited and includes inorganic fine particles, organic fine particles, or a mixture thereof.
  • the inner layer 12 that constitutes the front plate 10 is provided between the outer layer 11 and the first bonding layer 20, and is in direct contact with both the outer layer 11 and the first bonding layer 20.
  • the inner layer 12 can be provided to improve the impact resistance of the optical layered body 100.
  • the thickness of the inner layer 12 is 100 ⁇ m or less, which facilitates imparting the optical laminate 100 with flexibility suitable for a flexible display.
  • the inner layer 12 may have a retardation characteristic for imparting the retardation value represented by the above formulas (1) and (2) to the front plate 10, and the inner layer 12 may have the above formula ( It may have a phase difference value represented by 1) and (2). As shown in FIG.
  • the inner layer 12 may include a second resin film 12a and a second laminating layer 12b for laminating the second resin film 12a and the outer layer 11 together. ..
  • the side of the second resin film 12a opposite to the second bonding layer 12b may be in direct contact with the first bonding layer 20.
  • the inner layer 12 may further include two or more resin films and a bonding layer for bonding the two or more resin films.
  • the rigidity represented by the product of the tensile elastic modulus of the inner layer 12 at a temperature of 23 ° C. and a relative humidity of 55% and the thickness of the inner layer 12 is preferably 10 MPa ⁇ mm or more, and 40 MPa ⁇ mm or more. Is more preferable, 80 MPa ⁇ mm or more is more preferable, 1000 MPa ⁇ mm or less is preferable, 700 MPa ⁇ mm or less is more preferable, and 640 MPa ⁇ mm or less is further preferable.
  • the rigidity of the inner layer 12 is within the above range, it is easy to improve the impact resistance while ensuring the flexibility of the optical layered body 100.
  • the rigidity of the inner layer 12 is preferably smaller than the rigidity of the outer layer 11 and the circular polarizing plate 30, and may be larger than the rigidity of the first bonding layer 20.
  • the tensile elastic modulus of the inner layer 12 at a temperature of 23 ° C. and a relative humidity of 55% is preferably 1000 MPa or more, more preferably 1500 MPa or more, even 2000 MPa or more, and 10000 MPa or less. Is preferable, more preferably 9000 MPa or less, and even more preferably 8,000 MPa or less.
  • the tensile modulus of elasticity of the inner layer 12 at a temperature of 23 ° C. and a relative humidity of 55% can be measured by the method described in Examples described later. It is the value measured by
  • the tensile elastic modulus a [MPa] of the second resin film 12a at a temperature of 23 ° C. and a relative humidity of 55% is 1000 MPa or more. It is preferably 1500 MPa or more, more preferably 2000 MPa or more, 3000 MPa or more, 3500 MPa or more, and preferably 7000 MPa or less, and 6000 MPa or less. More preferably, it may be 5000 MPa or less.
  • the tensile elastic modulus of the second resin film 12a at a temperature of 23 ° C. and a relative humidity of 55% can be measured by the method described above.
  • the second resin film 12a has a tensile modulus of 2 or more. It refers to the overall tensile elastic modulus including the film and the bonding layer.
  • the thickness of the inner layer 12 is 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, and preferably 20 ⁇ m or more, more preferably 40 ⁇ m or more.
  • the thickness of the inner layer 12 is small, the impact resistance tends to decrease, and when the thickness of the inner layer 12 increases, the flexibility tends to decrease.
  • the second resin film 12a may be a second retardation film having retardation characteristics.
  • the in-plane retardation value of the inner layer 12 at the wavelength of 550 nm may be, for example, 100 nm or more, and may be 1000 nm or more or 3000 nm or more.
  • the thickness direction retardation value of the inner layer 12 at a wavelength of 550 nm can be, for example, 2500 nm or more, and may be 3000 nm or more.
  • the inner layer 12 includes two or more resin films and a bonding layer for bonding the two or more resin films to each other, the in-plane retardation value and the thickness direction position of the second resin film 12a described above.
  • the retardation value means the in-plane retardation value and the thickness direction retardation value of the whole including two or more resin films and the bonding layer.
  • the inner layer 12 includes the second retardation film and the outer layer 11 is the first retardation film
  • the slow axis direction of the first retardation film and the slow phase of the second retardation film it is preferable to stack the outer layer 11 and the inner layer 12 so that they are aligned in the axial direction. As a result, good visibility can be obtained when the image display device using the optical laminate 100 is viewed through the polarized sunglasses.
  • the angle formed by the slow axis of the first retardation film and the absorption axis of the circular polarizing plate 30 and the angle formed by the slow axis of the second retardation film and the absorption axis of the circular polarizing plate 30 are 25 ° or more. Is preferable, 30 ° or more is more preferable, 35 ° or more is further preferable, 65 ° or less is preferable, 60 ° or less is more preferable, 55 ° or less Is more preferable, and 45 ° is most preferable.
  • the thickness b [ ⁇ m] of the second resin film 12a is not particularly limited, but is, for example, preferably 10 ⁇ m or more, more preferably 15 ⁇ m or more, further preferably 20 ⁇ m or more, and 30 ⁇ m or more. May be 50 ⁇ m or more.
  • the thickness b [ ⁇ m] of the second resin film 12a may be 150 ⁇ m or less, may be 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, and 50 ⁇ m or less. It is more preferable that there is.
  • the inner layer 12 includes two or more resin films and a bonding layer for bonding two or more resin films to each other, the thickness of the second resin film 12a described above is two or more resin films. It means the total thickness including the bonding layer.
  • 10 ⁇ 3 ′′) [MPa ⁇ mm] is preferably 10 MPa ⁇ mm or more, more preferably 40 MPa ⁇ mm or more, further preferably 80 MPa ⁇ mm or more, and 150 MPa ⁇ mm or more. It may be 200 MPa ⁇ mm or more, or 300 MPa ⁇ mm or more.
  • the rigidity of the second resin film 12a is preferably 1500 MPa ⁇ mm or less, more preferably 1000 MPa ⁇ mm or less, 800 MPa ⁇ mm or less, or 500 MPa ⁇ mm or less. .. When the rigidity of the second resin film 12a is within the above range, it is easy to improve the impact resistance while ensuring the flexibility of the optical laminate 100.
  • the second resin film 12a is not limited as long as it is a film that can transmit light, and examples thereof include a film formed of a polymer as the first resin film forming the outer layer 11.
  • a film formed of a polymer such as polyethylene naphthalate or polyethylene terephthalate can be preferably used as the second resin film 12a.
  • the second bonding layer 12b may be an adhesive layer, but is preferably an adhesive layer. Since the second bonding layer 12b is the pressure-sensitive adhesive layer, the rigidity of the inner layer 12 can be easily adjusted within the above range, and the impact resistance of the optical layered body 100 can be easily improved.
  • the pressure-sensitive adhesive layer and the adhesive layer can be formed using the materials described below.
  • the thickness c [ ⁇ m] of the second bonding layer 12b is not particularly limited, but can be, for example, 1 ⁇ m or more, 3 ⁇ m or more, 5 ⁇ m or more, or 10 ⁇ m or more. , 15 ⁇ m or more, 20 ⁇ m or more, usually 50 ⁇ m or less, and preferably 30 ⁇ m or less.
  • the tensile elastic modulus a [MPa] of the second resin film 12a of the inner layer 12 constituting the front plate 10 described above, the thickness b [ ⁇ m] of the second resin film 12a, and the thickness c of the second bonding layer 12b. [ ⁇ m] is the following formula (3): (A ⁇ b ⁇ 10 ⁇ 3 ) + (c / 2) ⁇ 55 (3) It is preferable to satisfy the relationship.
  • the durability of the optical laminate 100 in the pen drop test it is possible to improve the durability of the optical laminate 100 in the pen drop test. It is considered that the pressure applied to the bottom surface side (circular polarizing plate 30 side) of the optical laminate 100 can be reduced by improving the durability against the pen drop test. Therefore, when a touch panel sensor or a display laminated body is provided on the bottom surface side of the optical laminated body 100 like a composite optical laminated body or an image display device described later, by using the optical laminated body satisfying the relationship of the above formula (3), the durability of the composite optical layered body and the image display device can be improved.
  • the composite optical layered body it is easy to suppress the malfunction of the touch panel sensor provided on the bottom surface side (circular polarizing plate 30 side) of the optical layered body 100. Further, by satisfying the formula (3), it is possible to improve the durability against the ball drop test.
  • the durability to the pen drop test can be evaluated by the method described in Examples below.
  • the value on the left side of the above formula (3) is more preferably 60 or more, more preferably 80 or more, 100 or more, 200 or more, and 250 or more. Is more preferable, and may be 300 or more.
  • the value on the left side of the above formula (3) is usually 500 or less, and may be 400 or less.
  • the pressure-sensitive adhesive layer forming the second bonding layer 12b is composed of a pressure-sensitive adhesive composition containing a resin such as a (meth) acrylic resin, a rubber resin, a urethane resin, an ester resin, a silicone resin, or a polyvinyl ether resin as a main component.
  • a resin such as a (meth) acrylic resin, a rubber resin, a urethane resin, an ester resin, a silicone resin, or a polyvinyl ether resin
  • a pressure-sensitive adhesive composition containing a (meth) acrylic resin as a base polymer which is excellent in transparency, weather resistance, heat resistance, etc., is preferable.
  • the pressure-sensitive adhesive composition may be thermosetting.
  • Examples of the (meth) acrylic resin (base polymer) used in the pressure-sensitive adhesive composition include butyl (meth) acrylate, ethyl (meth) acrylate, isooctyl (meth) acrylate, and 2- (meth) acrylic acid.
  • a polymer or copolymer having one or more (meth) acrylic acid ester monomers such as ethylhexyl as a monomer is preferably used. It is preferable to copolymerize a polar monomer with the base polymer.
  • Examples of polar monomers include (meth) acrylic acid, 2-hydroxypropyl (meth) acrylate, hydroxyethyl (meth) acrylate, (meth) acrylamide, N, N-dimethylaminoethyl (meth) acrylate, glycidyl ( Examples thereof include monomers having a carboxyl group, a hydroxyl group, an amide group, an amino group, an epoxy group and the like such as (meth) acrylate.
  • the pressure-sensitive adhesive composition may contain only the above base polymer, but usually further contains a crosslinking agent.
  • a cross-linking agent a metal ion having a valence of 2 or more and forming a carboxylic acid metal salt with a carboxyl group; a polyamine compound forming an amide bond with a carboxyl group; Examples thereof include epoxy compounds and polyols that form an ester bond with a carboxyl group; and polyisocyanate compounds that form an amide bond with a carboxyl group. Of these, polyisocyanate compounds are preferable.
  • the pressure-sensitive adhesive composition includes fine particles for imparting light-scattering properties, beads (resin beads, glass beads, etc.), glass fibers, resins other than base polymers, tackifiers, fillers (metal powder and other inorganic powders). Etc.), antioxidants, ultraviolet absorbers, dyes, pigments, colorants, defoamers, corrosion inhibitors, photopolymerization initiators, and other additives.
  • It can be formed by applying an organic solvent diluted solution of the above-mentioned pressure-sensitive adhesive composition onto a substrate and drying.
  • the formed pressure-sensitive adhesive layer can be irradiated with an active energy ray to obtain a cured product having a desired degree of curing.
  • the adhesive layer forming the second bonding layer 12b can be composed of an adhesive composition.
  • an adhesive composition a water-based adhesive composition such as a polyvinyl alcohol-based resin aqueous solution or a water-based two-component urethane-based emulsion adhesive; an active energy ray-curable adhesive that is cured by irradiation with active energy rays such as ultraviolet rays A composition etc. can be mentioned.
  • the first bonding layer 20 is a layer that is interposed between the inner layer 12 of the front plate 10 and the circularly polarizing plate 30 to bond them, and is a pressure-sensitive adhesive layer or an adhesive layer.
  • the pressure-sensitive adhesive layer and the adhesive layer can be formed using the above-mentioned materials.
  • the second bonding layer 12b is preferably a pressure-sensitive adhesive layer from the viewpoint of improving the impact resistance while ensuring the flexibility of the optical layered body 100.
  • the storage elastic modulus of the first bonding layer 20 at a temperature of 23 ° C. and a relative humidity of 55% is preferably 0.001 MPa or more, may be 0.01 MPa or more, and may be 0.1 MPa or more. Further, it is preferably 0.5 MPa or less, and may be 0.3 MPa or less.
  • the storage elastic modulus of the first bonding layer 20 at a temperature of 23 ° C. and a relative humidity of 55% can be measured by the method described in Examples described later.
  • the thickness of the first bonding layer 20 may be, for example, 1 ⁇ m or more, may be 3 ⁇ m or more, may be 5 ⁇ m or more, may be 10 ⁇ m or more, and is usually 100 ⁇ m or less. , 50 ⁇ m or less, and may be 30 ⁇ m or less.
  • the circular polarization plate 30 includes a linear polarization plate 31 and a retardation layer 32 in order from the first bonding layer 20 side. Further, since the circularly polarizing plate 30 can suppress the emission of the reflected light of the external light, the function as an antireflection film can be imparted to the optical laminate 100.
  • the thickness of the circularly polarizing plate 30 is usually 5 ⁇ m or more, 20 ⁇ m or more, 25 ⁇ m or more, 30 ⁇ m or more, and preferably 80 ⁇ m or less, and 60 ⁇ m or less. Is more preferable.
  • the thickness of the circularly polarizing plate 30 is within the above range, the influence of the optical laminated body 100 on the load resistance in the ball drop test is smaller than that of the other layers forming the optical laminated body 100, and the influence is ignored. be able to.
  • the linearly polarizing plate 31 has a function of selectively transmitting linearly polarized light in one direction from unpolarized light such as natural light.
  • Examples of the linear polarizing plate 31 include a stretched film having a dye having absorption anisotropy adsorbed thereon, or a film including a film obtained by coating and curing a dye having absorption anisotropy as a polarizer.
  • Examples of the dye having absorption anisotropy include dichroic dyes. Specifically, iodine or a dichroic organic dye is used as the dichroic pigment.
  • the dichroic organic dye includes a dichroic direct dye composed of a disazo compound such as CIDIRECT RED 39 and a dichroic direct dye composed of a compound such as trisazo and tetrakisazo.
  • the film coated with a dye having absorption anisotropy which is used as a polarizer, is a stretched film having a dye having absorption anisotropy adsorbed thereon, or a composition or a dichroic dye containing liquid crystallinity. Examples thereof include a film having a layer obtained by applying a composition containing a colorant and a polymerizable liquid crystal and curing the composition.
  • a film coated with a dye having absorption anisotropy and cured is preferable because it has no limitation in the bending direction as compared with a stretched film to which a dye having absorption anisotropy is adsorbed.
  • the visibility-corrected polarization degree (Py) of the polarizer included in the linear polarizing plate 31 is usually 97% or higher, preferably 98% or higher, and more preferably 99% or higher. Further, the visibility correction transmittance (Ty) of the polarizer is usually 40% or more, preferably 41% or more, more preferably 42% or more, and may be 44% or more.
  • the stretched film which is a polarizer and has a dye having absorption anisotropy adsorbed, is usually a step of uniaxially stretching a polyvinyl alcohol-based resin film, by staining the polyvinyl alcohol-based resin film with a dichroic dye, It is manufactured through a step of adsorbing a dichroic dye, a step of treating the polyvinyl alcohol-based resin film on which the dichroic pigment is adsorbed with an aqueous solution of boric acid, and a step of washing with water after the treatment with the aqueous solution of boric acid.
  • Such a polarizer may be used as it is as a linear polarizing plate, or one having a transparent protective film laminated on one side or both sides may be used as a linear polarizing plate.
  • the thickness of the polarizer thus obtained is preferably 2 ⁇ m to 40 ⁇ m.
  • Polyvinyl alcohol resin is obtained by saponifying polyvinyl acetate resin.
  • polyvinyl acetate-based resin in addition to polyvinyl acetate which is a homopolymer of vinyl acetate, a copolymer of vinyl acetate and another monomer copolymerizable therewith is used.
  • examples of other monomers copolymerizable with vinyl acetate include unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and (meth) acrylamides having an ammonium group.
  • the saponification degree of the polyvinyl alcohol resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • the polyvinyl alcohol-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes can also be used.
  • the degree of polymerization of the polyvinyl alcohol-based resin is usually about 1,000 to 10,000, preferably 1,500 to 5,000.
  • a film made of such a polyvinyl alcohol resin is used as a raw film for a polarizer.
  • the method for forming a film of the polyvinyl alcohol-based resin is not particularly limited, and the film can be formed by a known method.
  • the thickness of the polyvinyl alcohol-based raw film can be set to, for example, about 10 ⁇ m to 150 ⁇ m.
  • the uniaxial stretching of the polyvinyl alcohol resin film can be performed before dyeing with the dichroic dye, simultaneously with dyeing, or after dyeing.
  • the uniaxial stretching may be performed before the boric acid treatment or during the boric acid treatment. It is also possible to carry out uniaxial stretching in these plural stages.
  • stretching may be uniaxial between rolls having different peripheral speeds, or uniaxial stretching may be performed using a heat roll.
  • the uniaxial stretching may be dry stretching in which stretching is performed in the atmosphere, or wet stretching in which a polyvinyl alcohol-based resin film is swollen using a solvent.
  • the draw ratio is usually about 3 to 8 times.
  • the material of the protective film to be attached to one side or both sides of the polarizer is not particularly limited, for example, cyclic polyolefin resin film, triacetyl cellulose, cellulose acetate-based resin consisting of diacetyl cellulose.
  • Films known in the art such as resin films, polyester resin films made of resins such as polyethylene terephthalate, polyethylene naphthalate, polybutylene terephthalate, polycarbonate resin films, (meth) acrylic resin films, polypropylene resin films, etc. Can be mentioned.
  • the thickness of the protective film is usually 100 ⁇ m or less, preferably 80 ⁇ m or less, more preferably 60 ⁇ m or less, and usually 5 ⁇ m or more, preferably 20 ⁇ m or more. ..
  • the protective film may or may not have a retardation.
  • a linear polarizing plate having a film formed from liquid crystal layer as a polarizer will be described.
  • a film coated with a dye having absorption anisotropy used as a polarizer a composition containing a dichroic dye having liquid crystallinity, or a composition containing a dichroic dye and a liquid crystal compound is used as a base material. Examples thereof include a film obtained by applying and curing.
  • the film may be used as a linear polarizing plate after peeling the base material or together with the base material, or may be used as a linear polarizing plate with a structure having a protective film on one side or both sides thereof.
  • the protective film the same one as the linear polarizing plate including the above-mentioned stretched film as a polarizer can be used.
  • the film obtained by applying a dye having absorption anisotropy and curing the film is thin, but if it is too thin, the strength tends to decrease and the processability tends to deteriorate.
  • the thickness of the film is usually 20 ⁇ m or less, preferably 5 ⁇ m or less, more preferably 0.5 ⁇ m or more and 3 ⁇ m or less.
  • Specific examples of the film obtained by coating the dye having the absorption anisotropy include films described in JP2013-37353A and JP2013-33249A.
  • the retardation layer 32 may be one layer or two or more layers.
  • the retardation layer 32 includes a ⁇ / 4 layer, and may further include a ⁇ / 2 layer and a positive C layer.
  • a ⁇ / 2 layer When the retardation layer 32 includes a ⁇ / 2 layer, a ⁇ / 2 layer and a ⁇ / 4 layer are sequentially stacked from the linear polarizing plate 31 side.
  • a ⁇ / 4 layer and a positive C layer may be sequentially stacked from the linear polarizing plate 31 side, and the positive C layer and the ⁇ / 4 layer may be sequentially stacked from the linear polarizing plate 31 side. You may laminate.
  • the retardation layer 32 may be formed of the resin film exemplified as the material of the protective film, or may be formed of a layer in which a polymerizable liquid crystal compound is cured.
  • the retardation layer 32 may further include an alignment film or a substrate film, and may have a bonding layer for bonding the ⁇ / 4 layer and the ⁇ / 2 layer or the positive C layer. ..
  • the laminating layer is a pressure-sensitive adhesive layer or an adhesive layer, and those mentioned above can be used.
  • the composite optical layered body includes the optical layered body 100 and a touch panel sensor.
  • the touch panel sensor is provided on the circularly polarizing plate 30 side of the optical laminate 100.
  • the optical laminate 100 and the touch panel sensor can be laminated, for example, via a bonding layer for the touch panel sensor.
  • the laminating layer is a pressure-sensitive adhesive layer and an adhesive layer, and the pressure-sensitive adhesive layer and the adhesive layer can be configured using the above-mentioned materials.
  • FIG. 2 is a schematic cross-sectional view schematically showing an example of the image display device of this embodiment.
  • the image display device includes an optical layered body 100 including the front plate 10 arranged on the front surface (viewing side) thereof, a display layered body 200 including a display unit, and a third bonding layer 40.
  • the display laminated body 200 is laminated on the circular polarizing plate 30 side of 100 with the third bonding layer 40 interposed therebetween.
  • the third bonding layer 40 is for bonding the circularly polarizing plate 30 in the optical laminate 100 and the display laminate 200.
  • the third laminating layer 40 is provided on the circularly polarizing plate 30 of the optical laminated body 100, and the display laminating layer is provided on the third laminating layer 40.
  • the bodies 200 may be stacked.
  • the laminating layer for the display laminate is a pressure-sensitive adhesive layer or an adhesive layer, and the pressure-sensitive adhesive layer and the adhesive layer can be formed using the above-mentioned materials.
  • the image display device 300 may be a flexible display panel.
  • the image display device which is a flexible display, may be configured to be foldable with the surface on the viewing side facing inward, or may be configured to be rollable.
  • the image display device 300 can be configured as a touch panel type image display device.
  • a touch panel type image display device can be configured by using the above-described composite optical laminate, and the touch panel sensor side of the composite optical laminate and the display laminate 200 are, for example, via a bonding layer for the display laminate. Can be laminated.
  • the laminating layer for the display laminate is a pressure-sensitive adhesive layer and an adhesive layer, and the pressure-sensitive adhesive layer and the adhesive layer can be formed using the above-mentioned materials.
  • the front plate 10 included in the optical laminated body 100 of the composite optical laminated body constitutes the touch surface.
  • the display unit included in the display laminate 200 includes, for example, a display unit including a display element such as a liquid crystal display element, an organic EL display element, an inorganic EL display element, a plasma display element, and a field emission display element.
  • a display element such as a liquid crystal display element, an organic EL display element, an inorganic EL display element, a plasma display element, and a field emission display element.
  • the image display device 300 can be used as a mobile device such as a smartphone or a tablet, a television, a digital photo frame, an electronic signboard, a measuring instrument or measuring instrument, an office device, a medical device, a computer device, or the like.
  • the thickness of each layer was measured using an ellipsometer (M-220, manufactured by JASCO Corporation) or a contact type film thickness meter (MH-15M, Nikon Co., Ltd., counter TC101, MS-5C).
  • the tensile modulus was measured at a temperature of 23 ° C. and a relative humidity of 55% using a tensile tester (AG-1S, manufactured by Shimadzu Corporation). When the measurement target is a retardation film, the tensile elastic modulus in the slow axis direction was measured.
  • the in-plane retardation value and the thickness direction retardation value were measured using a birefringence measuring device (Axo Sacn, manufactured by Axometrics).
  • Test balls (1), 1g, 3g, 4g, 7g, 12g, 16g, 19g, 22g, 25g, 32g, 36g were used, and the test sample (1) (optical laminate or alkali-free
  • the maximum value among the weights of the test spheres in which cracks, scratch marks and dents were not found in the glass) was called the ball drop test withstand load (g) and was used as an index of impact resistance.
  • a flexural evaluation device (CFT-150AC, manufactured by Covotech, Inc.) was provided on the circularly polarizing plate side of the optical laminates obtained in each of the examples and the comparative examples via an acrylic adhesive (manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 20 ⁇ m. After fixing it in a flat state (not bent), bend it so that the front plate side will be the inner side at a rate of 30 times per minute under the conditions of a radius of curvature of 3 mm and a temperature of 25 ° C.
  • the bending operation for returning to the original flat state was repeated, and the number of times of bending when a crack or whitening occurred at the bending position was counted as the limit number of bending.
  • the occurrence of cracks and floating of the bonding layer (adhesive layer) in the bent area due to the bending operation If it is not seen even after the number of flexing reaches 200,000 (the limit number of flexing is 200,000 or more), A, When the number of flexing is 100,000 or more and less than 200,000 (the limit number of flexing is 100,000 or more and less than 200,000), B, C when the number of flexing times is less than 100,000 times (the limit number of flexing times is less than 100,000 times), As a result, the flexibility test was evaluated.
  • an evaluation pen weighing about 5.6 g (the diameter of the pen tip: at a distance of 10 cm from the outermost surface of the front plate of the test sample (2): (0.75 mm) was held so that the pen tip was positioned and the tip was directed downward, and the evaluation pen was dropped from that position toward the front plate side.
  • the bridge wiring (wiring that electrically connects the touch electrodes) of the conductive layer of the touch panel sensor is marked, and the pen tip falls on the marked bridge portion.
  • the evaluation pen was dropped was dropped.
  • the test sample (2) with the evaluation pen dropped was observed with a scanning electron microscope (SEM) (SU8010, manufactured by Horiba), and the touch panel sensor function was confirmed. Based on the occurrence of cracks and the operation of the touch panel sensor, If there is no crack and the touch panel sensor operates normally, A, If there is a crack and the touch panel sensor operates normally, B, If there is a crack and the touch panel sensor does not operate normally, C, As a result, the pen drop test was evaluated.
  • SEM scanning electron microscope
  • Example 1 (Preparation of front panel)
  • the outer layer a 60 ⁇ m-thick first resin film having a hard coat layer formed on one surface of a substrate film was prepared.
  • the base film was a polyimide resin film having a thickness of 50 ⁇ m.
  • the hard coat layer had a thickness of 10 ⁇ m and was a layer formed from a composition containing a dendrimer compound having a polyfunctional acrylic group at the end.
  • the obtained outer layer had an in-plane retardation value at a wavelength of 550 nm of 133 nm, a thickness direction retardation value at a wavelength of 550 nm of 1754 nm, and a tensile elastic modulus of 8000 MPa.
  • the inner layer a laminate having a second bonding layer formed on a second resin film was prepared.
  • the second resin film is a 34 ⁇ m thick polyethylene naphthalate (PEN) film (“Teonex”, manufactured by Teijin Limited), and the second bonding layer is a 5 ⁇ m thick acrylic adhesive (Sumitomo Chemical Co., Ltd.). )Met.
  • the second resin film had an in-plane retardation value at a wavelength of 550 nm of 6933 nm, a thickness direction retardation value at a wavelength of 550 nm of 8959 nm, and a tensile elastic modulus of 2400 MPa.
  • the tensile elastic modulus of the inner layer was 2500 MPa and the rigidity was 98 MPa ⁇ mm.
  • the front plate was obtained by bonding the surface of the outer layer opposite to the side on which the hard coat layer was formed and the second bonding layer of the inner layer to each other.
  • the outer layer and the inner layer were laminated so that the slow axis direction of the first resin film forming the outer layer and the slow axis direction of the second resin film forming the inner layer coincided with each other.
  • the in-plane retardation value R0 (550) at the wavelength of 550 nm and the thickness direction retardation value Rth (550) at the wavelength of 550 nm were measured for the obtained front plate. The results are shown in Table 1.
  • a polyvinyl alcohol (PVA) film having an average degree of polymerization of about 2,400, a degree of saponification of 99.9 mol% or more and a thickness of 20 ⁇ m was prepared. After immersing the PVA film in pure water at 30 ° C., it was immersed in an aqueous solution having a mass ratio of iodine / potassium iodide / water of 0.02 / 2/100 at 30 ° C. to perform iodine dyeing (iodine dyeing step). ..
  • the PVA film that had been subjected to the iodine dyeing step was immersed in an aqueous solution having a potassium iodide / boric acid / water mass ratio of 12/5/100 at 56.5 ° C. to perform boric acid treatment (boric acid treatment step). ..
  • the PVA film that had been subjected to the boric acid treatment step was washed with pure water at 8 ° C and then dried at 65 ° C to obtain a polarizer in which iodine was adsorbed and oriented in polyvinyl alcohol.
  • the stretching of the PVA film was performed in the iodine dyeing step and the boric acid treatment step.
  • the total draw ratio of the PVA film was 5.3 times.
  • the thickness of the obtained polarizer was 8 ⁇ m.
  • the polarizer obtained above and a cycloolefin polymer (COP) film having a thickness of 13 ⁇ m are nip rolls via an aqueous adhesive. Pasted together. While maintaining the tension of the obtained bonded product at 430 Nm, it was dried at 60 ° C. for 2 minutes to obtain a linear polarizing plate having a COP film on one surface.
  • COP cycloolefin polymer
  • the water-based adhesive is 100 parts of water, 3 parts of a carboxyl group-modified polyvinyl alcohol (“Kuraray Poval KL318”, manufactured by Kuraray Co., Ltd.), and a water-soluble polyamide epoxy resin (“Sumiraz resin 650” (solid content concentration 30% Aqueous solution), manufactured by Taoka Chemical Co., Ltd.) and 1.5 parts.
  • Kuraray Poval KL318 carboxyl group-modified polyvinyl alcohol
  • Sumiraz resin 650 solid content concentration 30% Aqueous solution
  • NMP N-methyl-2-pyrrolidone
  • Leveling agent (1 part): F-556 (manufactured by DIC Corporation) -Polymerization initiator (6 parts): 2-Dimethylamino-2-benzyl-1- (4-morpholinophenyl) butan-1-one (Irgacure 369, manufactured by BASF Japan Ltd.)
  • a cyclic olefin resin (COP) film (ZF-14-50, manufactured by Zeon Corporation) was subjected to corona treatment.
  • the corona treatment was performed once using TEC-4AX (manufactured by USHIO INC.) Under the conditions of an output of 0.78 kW and a treatment speed of 10 m / min.
  • the composition for forming a horizontal alignment film obtained above was applied to the corona-treated surface of this COP film with a bar coater and dried at 80 ° C. for 1 minute.
  • the axial angle was set to 45 ° so that the integrated light amount at a wavelength of 313 nm was 100 mJ / cm 2 . And exposed to polarized UV to obtain a horizontal alignment film having a thickness of 100 nm.
  • the composition for forming a horizontal alignment liquid crystal layer obtained above was applied to this horizontal alignment film using a bar coater, and dried at 120 ° C. for 1 minute. Irradiate the coating film with ultraviolet rays using a high-pressure mercury lamp (“Unicure VB-15201BY-A”, manufactured by Ushio Inc.) (in a nitrogen atmosphere, integrated light amount at wavelength 365 nm: 500 mJ / cm 2 ). Thus, a ⁇ / 4 retardation layer which is a horizontally aligned liquid crystal layer was formed to obtain a retardation layer. The thickness of the ⁇ / 4 retardation layer was 2.3 ⁇ m. The obtained retardation layer has a COP film, a horizontal alignment film, and a ⁇ / 4 retardation layer in this order.
  • a 5 ⁇ m-thick acrylic pressure-sensitive adhesive (Sumitomo Chemical Co., Ltd.) was laminated on the ⁇ / 4 phase-difference layer side of the obtained retardation layer, and after bonding this pressure-sensitive adhesive and glass, the COP film was peeled off. Then, a measurement sample was obtained.
  • the ⁇ / 4 retardation layer was a positive A plate satisfying the relationship of nx> ny ⁇ nz.
  • Rth p (450) 61 nm
  • Rth p (550) 71 nm
  • Rth p (650) 73 nm Met.
  • the polarizer side of the linear polarizing plate obtained above and the ⁇ / 4 retardation layer side of the retardation layer obtained above were pasted together with an acrylic pressure-sensitive adhesive (manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 5 ⁇ m. Then, the COP film of the retardation layer was peeled off to obtain a circularly polarizing plate.
  • the linear polarizing plate and the retardation layer were attached so that the angle formed by the absorption axis of the polarizer and the slow axis of the ⁇ / 4 retardation layer was 45 °.
  • the circularly polarizing plate has a COP film (COP film of a linear polarizing plate), a polarizer, an acrylic pressure sensitive adhesive, and a ⁇ / 4 retardation layer in this order.
  • Example 2 As the second resin film forming the inner layer, a high birefringence polyethylene terephthalate (PET) film (“Cosmoshine SRF”, manufactured by Toyobo Co., Ltd.) having a thickness of 80 ⁇ m was used in the same manner as in Example 1, The front plate was obtained to obtain an optical laminate.
  • the second resin film had an in-plane retardation value at a wavelength of 550 nm of 6187 nm, a thickness direction retardation value at a wavelength of 550 nm of 6320 nm, and a tensile elastic modulus of 3800 MPa.
  • the tensile elastic modulus of the inner layer was 3900 MPa, and the rigidity was 332 MPa ⁇ mm.
  • the in-plane retardation value R0 (550) at a wavelength of 550 nm and the thickness direction retardation value Rth (550) at a wavelength of 550 nm were measured for the obtained front plate.
  • a ball drop test, a bending test, a visibility test, and a pen drop test were performed using the obtained optical layered body. The results are shown in Table 1.
  • Example 3 A front plate was prepared in the same manner as in Example 1 except that a biaxially stretched polyethylene terephthalate (PET) film having a thickness of 45 ⁇ m (“Lumirror”, manufactured by Toray Industries, Inc.) was used as the second resin film forming the inner layer.
  • PET polyethylene terephthalate
  • the second resin film had an in-plane retardation value of 2655 nm at a wavelength of 550 nm, a thickness direction retardation value of 3455 nm at a wavelength of 550 nm, and a tensile elastic modulus of 4000 MPa.
  • the tensile elastic modulus of the inner layer was 4100 MPa, and the rigidity was 205 MPa ⁇ mm.
  • the in-plane retardation value R0 (550) at a wavelength of 550 nm and the thickness direction retardation value Rth (550) at a wavelength of 550 nm were measured for the obtained front plate.
  • a ball drop test, a bending test, a visibility test, and a pen drop test were performed using the obtained optical layered body. The results are shown in Table 1.
  • Example 4 As the second resin film forming the inner layer, a uniaxially stretched cycloolefin polymer (COP) film (“ZF-14-23”, manufactured by Nippon Zeon Co., Ltd.) having a thickness of 23 ⁇ m is used, and the second laminating layer forming the inner layer. As described above, a front plate was obtained and an optical laminate was obtained in the same manner as in Example 1 except that an acrylic adhesive (manufactured by Sumitomo Chemical Co., Ltd.) having a thickness of 20 ⁇ m was used.
  • COP cycloolefin polymer
  • the second resin film had an in-plane retardation value at a wavelength of 550 nm of less than 1 nm, a thickness direction retardation value at a wavelength of 550 nm of less than 1 nm, and a tensile elastic modulus of 2100 MPa.
  • the tensile elastic modulus of the inner layer was 2300 MPa, and the rigidity was 99 MPa ⁇ mm.
  • the in-plane retardation value R0 (550) at a wavelength of 550 nm and the thickness direction retardation value Rth (550) at a wavelength of 550 nm were measured for the obtained front plate.
  • a ball drop test, a bending test, a visibility test, and a pen drop test were performed using the obtained optical layered body. The results are shown in Table 1.
  • Example 1 A front plate was obtained and an optical laminate was obtained in the same manner as in Example 1 except that the inner layer was not provided.
  • the in-plane retardation value R0 (550) at the wavelength of 550 nm and the thickness direction retardation value Rth (550) at the wavelength of 550 nm were measured for the obtained front plate.
  • a ball drop test, a bending test, a visibility test, and a pen drop test were performed using the obtained optical layered body. The results are shown in Table 1.
  • Example 2 Same as Example 1 except that a uniaxially stretched cycloolefin polymer (COP) film (“ZF-14-23”, manufactured by Nippon Zeon Co., Ltd.) having a thickness of 23 ⁇ m was used as the second resin film forming the inner layer. Then, the front plate was obtained to obtain an optical laminate.
  • the second resin film had an in-plane retardation value at a wavelength of 550 nm of less than 1 nm, a thickness direction retardation value at a wavelength of 550 nm of less than 1 nm, and a tensile elastic modulus of 2100 MPa.
  • the tensile elastic modulus of the inner layer was 2200 MPa, and the rigidity was 62 MPa ⁇ mm.
  • the in-plane retardation value R0 (550) at a wavelength of 550 nm and the thickness direction retardation value Rth (550) at a wavelength of 550 nm were measured for the obtained front plate.
  • a ball drop test, a bending test, a visibility test, and a pen drop test were performed using the obtained optical layered body. The results are shown in Table 1.
  • a uniaxially stretched cycloolefin polymer (COP) film (“ZF-14-23”, manufactured by Nippon Zeon Co., Ltd.) having a thickness of 23 ⁇ m and an acrylic soft coat layer having a thickness of 80 ⁇ m (“ UF8003G ", manufactured by Kyoeisha Chemical Co., Ltd.) was used, and a front plate was obtained in the same manner as in Example 1 to obtain an optical laminate.
  • COP cycloolefin polymer
  • the second resin film had an in-plane retardation value at a wavelength of 550 nm of less than 1 nm, a thickness direction retardation value at a wavelength of 550 nm of less than 1 nm, and a tensile elastic modulus of 2100 MPa.
  • the tensile elastic modulus of the inner layer was 2300 MPa, and the rigidity was 248 MPa ⁇ mm.
  • the in-plane retardation value R0 (550) at a wavelength of 550 nm and the thickness direction retardation value Rth (550) at a wavelength of 550 nm were measured for the obtained front plate.
  • a ball drop test, a bending test, a visibility test, and a pen drop test were performed using the obtained optical layered body. The results are shown in Table 1.

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  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Theoretical Computer Science (AREA)
  • Optics & Photonics (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)
  • Electroluminescent Light Sources (AREA)

Abstract

L'invention concerne un stratifié optique ayant une résistance aux chocs supérieure tout en ayant également une bonne flexibilité appropriée à un affichage souple ; et un dispositif d'affichage d'image équipé de celui-ci. Le stratifié optique comprend une plaque avant, une plaque de polarisation circulaire et une première couche de liaison pour lier la plaque avant et la plaque de polarisation circulaire. La plaque de polarisation circulaire est pourvue d'une plaque de polarisation linéaire et d'une couche de retardement, dans cet ordre, à partir de la première couche de liaison. La plaque avant comprend une couche externe formant la surface la plus à l'extérieur du stratifié optique et une couche interne disposée de façon à entrer en contact avec la couche externe et la première couche de liaison. La couche externe est constituée d'un premier film de résine et la couche interne a une épaisseur de 100 µm ou moins. Le stratifié optique a une charge de tenue de 20 g ou plus dans un test de chute de balle.
PCT/JP2019/039675 2018-11-16 2019-10-08 Stratifié optique et dispositif d'affichage d'image le comprenant WO2020100468A1 (fr)

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KR1020217012594A KR20210091136A (ko) 2018-11-16 2019-10-08 광학 적층체 및 이것을 구비한 화상 표시장치
CN201980074493.4A CN113015928B (zh) 2018-11-16 2019-10-08 光学层叠体和具备该光学层叠体的图像显示装置

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007233215A (ja) * 2006-03-03 2007-09-13 Nippon Zeon Co Ltd 偏光板
JP2014089270A (ja) * 2012-10-29 2014-05-15 Dainippon Printing Co Ltd 光学積層体、並びにこれを用いた表示素子の前面板、表示装置、抵抗膜式タッチパネル及び静電容量式タッチパネル
JP2014215501A (ja) * 2013-04-26 2014-11-17 東洋紡株式会社 デジタル画像表示装置

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2007233215A (ja) * 2006-03-03 2007-09-13 Nippon Zeon Co Ltd 偏光板
JP2014089270A (ja) * 2012-10-29 2014-05-15 Dainippon Printing Co Ltd 光学積層体、並びにこれを用いた表示素子の前面板、表示装置、抵抗膜式タッチパネル及び静電容量式タッチパネル
JP2014215501A (ja) * 2013-04-26 2014-11-17 東洋紡株式会社 デジタル画像表示装置

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