WO2023027119A1 - Stratifié optique - Google Patents

Stratifié optique Download PDF

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Publication number
WO2023027119A1
WO2023027119A1 PCT/JP2022/031909 JP2022031909W WO2023027119A1 WO 2023027119 A1 WO2023027119 A1 WO 2023027119A1 JP 2022031909 W JP2022031909 W JP 2022031909W WO 2023027119 A1 WO2023027119 A1 WO 2023027119A1
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WO
WIPO (PCT)
Prior art keywords
layer
film
polarizing plate
adhesive layer
antistatic
Prior art date
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PCT/JP2022/031909
Other languages
English (en)
Japanese (ja)
Inventor
智之 山口
Original Assignee
住友化学株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 住友化学株式会社 filed Critical 住友化学株式会社
Priority to KR1020247009591A priority Critical patent/KR20240044530A/ko
Priority to CN202280057072.2A priority patent/CN117836680A/zh
Publication of WO2023027119A1 publication Critical patent/WO2023027119A1/fr

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    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3083—Birefringent or phase retarding elements
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/26—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer which influences the bonding during the lamination process, e.g. release layers or pressure equalising layers
    • 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
    • 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
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/14—Protective coatings, e.g. hard coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
    • G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
    • G02B1/16—Optical coatings produced by application to, or surface treatment of, optical elements having an anti-static effect, e.g. electrically conducting coatings
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising elements
    • G02B5/3016—Polarising elements involving passive liquid crystal elements

Definitions

  • the present invention relates to an optical laminate.
  • a polarizing plate including a linear polarizing layer is used as one of the optical components that constitute display devices such as liquid crystal display devices and organic EL display devices.
  • the polarizing plate When incorporating a polarizing plate into a display device, the polarizing plate is usually bonded to an image display element such as a display panel via an adhesive layer.
  • an adhesive layer In order to facilitate the work of incorporating the polarizing plate into the display device, it is known to preliminarily laminate an adhesive layer and a release film that can be peeled off the adhesive layer on the polarizing plate.
  • the polarizing plate can be incorporated into a display device by peeling off the release film from the polarizing plate laminated with the pressure-sensitive adhesive layer and the release film, and adhering the exposed pressure-sensitive adhesive layer to an image display element.
  • Patent Document 1 discloses the use of a surface protection film to prevent scratches on the surface of a reinforcing film for imparting rigidity and impact resistance to optical members, electronic members, and the like.
  • a surface protective film that can be peeled off from the polarizing plate may be attached to the surface of the polarizing plate.
  • a stretched film obtained by stretching a resin film is sometimes used as the release film and the surface protection film.
  • a stretched film has an in-plane retardation. Therefore, by laminating the stretched film and the polarizing plate so that the slow axis of the stretched film and the absorption axis of the linear polarizing layer are parallel or orthogonal, light transmission observation with crossed Nicols using this laminate A polarizer can be inspected.
  • a laminate of polarizing plates and stretched films is stored in the form of a stack of multiple sheets, so when inspecting polarizing plates, the laminate is taken out one by one from the stack of laminates.
  • the effect of static electricity sometimes causes so-called multiple picking, in which two or more laminates are taken out at the same time.
  • static electricity can be suppressed by using a resin film having an antistatic layer formed on the surface.
  • a stretched film with an antistatic layer may cause in-plane retardation unevenness.
  • light transmission observation with crossed Nicols using a laminate obtained by laminating such a stretched film on a polarizing plate it is difficult to inspect the polarizing plate.
  • the present invention provides an optical laminate in which at least one of a release film having an antistatic layer and a surface protective film having an antistatic layer is laminated on a polarizing plate, and which has excellent inspection properties. aim.
  • the present invention provides the following optical layered body.
  • An optical laminate in which a polarizing plate including a linear polarizing layer, a first pressure-sensitive adhesive layer, and a release film that can be peeled from the first pressure-sensitive adhesive layer are laminated in this order,
  • the release film has, in order from the first adhesive layer side, a release treatment layer, a first base film, and a first antistatic layer containing an antistatic agent,
  • the average in-plane retardation value of the release film at a wavelength of 550 nm is 1000 nm or more
  • the optical laminate, wherein the difference between the maximum and minimum in-plane retardation values of the release film at a wavelength of 550 nm is 150 nm or less.
  • [2] further comprising a surface protective film that is peelable from the polarizing plate on the opposite side of the polarizing plate to the first pressure-sensitive adhesive layer;
  • the surface protective film has an average in-plane retardation value of 1000 nm or more at a wavelength of 550 nm
  • the optical laminate according to [2], wherein the difference between the maximum value and the minimum value of the in-plane retardation value at a wavelength of 550 nm of the surface protective film is 150 nm or less.
  • An optical laminate in which a first adhesive layer, a polarizing plate including a linear polarizing layer, and a surface protective film that can be peeled from the polarizing plate are laminated in this order,
  • the surface protective film has a second base film and a second antistatic layer containing an antistatic agent in order from the polarizing plate side,
  • the average in-plane retardation value of the surface protective film at a wavelength of 550 nm is 1000 nm or more
  • the optical laminate, wherein the difference between the maximum and minimum in-plane retardation values of the surface protection film at a wavelength of 550 nm is 150 nm or less.
  • optical laminate according to any one of [2] to [4], wherein the surface protection film further has a second adhesive layer on the polarizing plate side of the second base film.
  • a release film is provided on the side opposite to the polarizing plate side of the first pressure-sensitive adhesive layer, the release film being peelable from the first pressure-sensitive adhesive layer, [4] or [5], wherein the release film has, in order from the first adhesive layer side, a release treatment layer, a first base film, and a first antistatic layer containing an antistatic agent. optical laminate.
  • the release film has, in order from the first adhesive layer side, a release treatment layer, a first base film, and a first antistatic layer containing an antistatic agent, According to [1] to [6], the release film has a surface resistance value of 1.0 ⁇ 10 8 ⁇ / ⁇ or more and 5.0 ⁇ 10 14 ⁇ / ⁇ or less at a temperature of 23° C. and a relative humidity of 55% RH.
  • the surface protective film has a second base film and a second antistatic layer containing an antistatic agent in order from the polarizing plate side,
  • the surface resistance value of the surface protective film at a temperature of 23° C. and a relative humidity of 55% RH is 1.0 ⁇ 10 8 ⁇ / ⁇ or more and 1.0 ⁇ 10 11 ⁇ / ⁇ or less, [1] to [7].
  • the optical layered body according to any one of . [9] The optical laminate according to any one of [1] to [8], wherein the polarizing plate has a protective layer on one or both sides of the linear polarizing layer.
  • the release film includes, in order from the first pressure-sensitive adhesive layer side, a release treatment layer, a first base film, And, having a first antistatic layer containing an antistatic agent,
  • the average in-plane retardation value of the release film at a wavelength of 550 nm is 1000 nm or more
  • the surface protective film has a second base film and a second antistatic layer containing an antistatic agent in order from the polarizing plate side,
  • the average in-plane retardation value of the surface protective film at a wavelength of 550 nm is 1000 nm or more
  • an optical laminate in which at least one of a release film having an antistatic layer and a surface protective film having an antistatic layer is laminated on a polarizing plate has excellent inspection properties. can.
  • FIG. 1 is a cross-sectional view schematically showing an optical layered body according to one embodiment of the present invention
  • FIG. 1 It is sectional drawing which shows typically an example of the inspection method by cross Nicols of the optical laminated body shown in FIG.
  • FIG. 4 is a cross-sectional view schematically showing an optical layered body according to another embodiment of the present invention
  • FIG. 4 is a cross-sectional view schematically showing an example of a method for inspecting the optical layered body shown in FIG. 3 with crossed Nicols;
  • FIG. 1 is a cross-sectional view schematically showing an optical layered body according to one embodiment of the present invention.
  • FIG. 2 is a cross-sectional view schematically showing an example of a method for inspecting the optical layered body shown in FIG. 1 with crossed Nicols.
  • the optical laminate 1 includes a polarizing plate 10 including a linear polarizing layer, a first pressure-sensitive adhesive layer 11, and a release film 20 that can be peeled from the first pressure-sensitive adhesive layer 11 in this order. Laminated.
  • the polarizing plate 10 and the first pressure-sensitive adhesive layer 11 are in direct contact, and the first pressure-sensitive adhesive layer 11 and the release film 20 are in direct contact.
  • the optical laminate 1 may further have a surface protection film 30 that can be peeled off from the polarizing plate 10 on the opposite side of the polarizing plate 10 to the first adhesive layer 11 side.
  • the polarizing plate 10 of the optical laminate 1 can be incorporated into a display device and used.
  • the release film 20 is peeled off from the optical laminate 1, the exposed first pressure-sensitive adhesive layer 11 is adhered to the image display element of the display device, and then the surface protection film 30 is attached. Just peel it off.
  • Examples of display devices include liquid crystal display devices and organic EL display devices, and examples of image display devices include liquid crystal display devices and organic EL display devices.
  • the optical laminate 1 has a polarizing plate 10 .
  • the polarizing plate 10 may include at least a linear polarizing layer, and may include layers other than the linear polarizing layer.
  • the polarizing plate 10 may have, for example, a protective layer on one side or both sides of the linear polarizing layer, and may have a surface functional layer on the surface of the protective layer.
  • the protective layer may be laminated so as to be in direct contact with the linear polarizing layer, or the linear polarizing layer and the protective layer may be laminated via a bonding layer.
  • the lamination layer is a pressure-sensitive adhesive layer or an adhesive layer. Details of each layer will be described later.
  • the optical laminate 1 has a first adhesive layer 11 .
  • the first adhesive layer 11 can be used as an adhesive layer for bonding the polarizing plate 10 to an image display element or the like.
  • the first adhesive layer 11 is preferably laminated so as to be in direct contact with the polarizing plate 10 . Details of the first adhesive layer 11 will be described later.
  • the optical laminate 1 has a release film 20 .
  • the release film 20 is for covering and protecting the first pressure-sensitive adhesive layer 11 , and in the optical layered product 1 , it is laminated on the first pressure-sensitive adhesive layer 11 so as to be peelable.
  • the release film 20 has an in-plane retardation value of the magnitude described later, and in the optical laminate 1, the slow axis of the release film 20 and the absorption axis of the linear polarizing layer are substantially parallel or substantially orthogonal to
  • substantially parallel means that the angle formed by the slow axis of the release film 20 and the absorption axis of the linearly polarizing layer is within 0 ° ⁇ 10 °, and the angle is preferably 0 ° ⁇ 5°, more preferably 0°.
  • Substantially orthogonal means that the angle formed by the slow axis of the release film 20 and the absorption axis of the linearly polarizing layer is within 90° ⁇ 10°, and the angle is preferably within 90° ⁇ 5°. and more preferably 90°.
  • the release film 20 includes, in order from the first pressure-sensitive adhesive layer 11 side of the optical laminate 1, a release treatment layer 22, a first base film 21, and a first antistatic agent containing a antistatic agent. It has a blocking layer 23 . It is preferable that the release treatment layer 22 and the first base film 21 are in direct contact with each other. It is preferable that the first base film 21 and the first antistatic layer 23 are in direct contact with each other. Details of each layer will be described later.
  • the average in-plane retardation value Re A1 of the release film 20 at a wavelength of 550 nm is 1000 nm or more.
  • the average in-plane retardation value Re A1 may be 1500 nm or more, 1800 nm or more, or 2000 nm or more.
  • the average in-plane retardation value Re A1 is usually 5000 nm or less, may be 4000 nm or less, or may be 3000 nm or less.
  • the average in-plane retardation value Re A1 of the release film 20 can be adjusted by the in-plane retardation value of the first base film 21, for example.
  • the in-plane retardation value of the first base film 21 can be adjusted by, for example, the type of resin forming the first base film 21, the draw ratio, and the like.
  • the average in-plane retardation value Re A1 can be determined by the method described in Examples below.
  • Re ma1 is the maximum in-plane retardation value of the release film 20 at a wavelength of 550 nm
  • Re mi1 is the minimum in - plane retardation value of the release film 20 at a wavelength of 550 nm.
  • ⁇ Re mi1 is 150 nm or less.
  • the difference ⁇ Re1 may be 130 nm or less, 110 nm or less, 100 nm or less, 80 nm or less, or 60 nm or less.
  • the difference ⁇ Re1 is usually 5 nm or more, may be 10 nm or more, or may be 20 nm or more.
  • the difference ⁇ Re1 of the release film 20 can be adjusted by the method of forming the first antistatic layer 23 on the first base film 21, or the like. For example, as will be described later, it can be adjusted by the temperature for drying a coating layer formed by coating a coating liquid containing an antistatic agent on the first base film 21 .
  • the difference ⁇ Re1 can be determined by the method described in Examples below.
  • the release film 20 included in the optical layered body 1 is used for multiple removal, in which two or more optical layered bodies 1 are taken out at the same time when the optical layered bodies 1 are taken out one by one from a stack in which a plurality of optical layered bodies 1 are superimposed. It has the first antistatic layer 23 in order to suppress such as.
  • the in-plane retardation value of the release film may not be uniform within the plane and may vary.
  • the polarizing plate 10 may be inspected by transmission observation of light with crossed Nicols using the optical layered body 1 .
  • the delamination of the optical layered body 1 occurs between the linearly polarized layer of the polarizing plate 60 for inspection and the linearly polarized layer of the optical layered body 1 arranged so as to form crossed Nicols. It tends to be noticeable when the film 20 is placed. Arrows in FIG. 2 indicate directions in which light from the light source 61 is observed when the polarizing plate 10 is inspected.
  • the optical laminate 1 even if it has the first antistatic layer 23, since the difference ⁇ Re1 of the release film 20 is within the above range, the variation of the in-plane retardation value is small. In cross Nicol light transmission observation using the optical layered body 1, the unevenness of the retardation is hardly visible. Therefore, since the polarizing plate 10 can be inspected by crossed Nicol light transmission observation using the optical layered body 1, the optical layered body 1 is excellent in inspectability.
  • the surface resistance value of the release film 20 at a temperature of 23° C. and a relative humidity of 55% RH is preferably 1.0 ⁇ 10 8 ⁇ / ⁇ or more and 5.0 ⁇ 10 14 ⁇ / ⁇ or less.
  • the surface resistance value of the release film 20 may be 1.0 ⁇ 10 9 ⁇ / ⁇ or more, 1.0 ⁇ 10 10 ⁇ / ⁇ or more, or 1.0 ⁇ 10 14 It may be ⁇ / ⁇ or less, 5.0 ⁇ 10 13 ⁇ / ⁇ or less, or 1.0 ⁇ 10 13 ⁇ / ⁇ or less.
  • the surface resistance value of the release film 20 can be adjusted, for example, by the type and amount of the antistatic agent contained in the first antistatic layer 23 .
  • the surface resistance value of the release film 20 is the surface resistance value of the release film 20 on the side of the first antistatic layer 23, and can be measured by the method described in Examples below.
  • the surface resistance value of the release film 20 is within the above range, even when the optical laminate 1 is taken out one by one from a stack in which a plurality of optical laminates 1 are stacked, two or more optical laminates It is possible to suppress multiple taking out of the body 1 at the same time.
  • the optical laminate 1 may have a surface protection film 30 .
  • the surface protective film 30 is used to cover and protect the surface of the polarizing plate 10 .
  • the optical layered body 1 is detachably attached to the surface of the polarizing plate 10 .
  • the surface protection film 30 may have an in-plane retardation value as described later.
  • the slow axis of the surface protective film 30 and the absorption axis of the linearly polarizing layer can be substantially parallel or substantially orthogonal. preferable.
  • substantially parallel means that the angle formed by the slow axis of the surface protective film 30 and the absorption axis of the linearly polarizing layer is within 0° ⁇ 10°, and the angle is preferably It is within 0° ⁇ 5°, more preferably 0°.
  • Substantially orthogonal means that the angle formed by the slow axis of the surface protective film 30 and the absorption axis of the linearly polarizing layer is within 90° ⁇ 10°, and the angle is preferably 90° ⁇ 5°. within, more preferably 90°.
  • the surface protective film 30 has a second base film 31 and a second antistatic layer 33 containing an antistatic agent in order from the polarizing plate 10 side of the optical laminate 1 .
  • the surface protection film 30 further has a second adhesive layer 32 on the polarizing plate 10 side of the optical laminate 1 as shown in FIG. It may be. It is preferable that the second adhesive layer 32 and the second base film 31 are in direct contact with each other.
  • FIG. 1 shows the case where the surface protection film 30 has the second adhesive layer 32.
  • the surface protection film 30 has the second adhesive layer 32 may not have
  • the second base film 31 and the polarizing plate 10 are in direct contact with each other in the optical laminate 1 .
  • the surface protection film 30 may further have a second antistatic layer 33 containing an antistatic agent on the side of the second base film 31 opposite to the second adhesive layer 32 side. It is preferable that the second base film 31 and the second antistatic layer 33 are in direct contact with each other. Details of each layer will be described later.
  • the average in-plane retardation value Re A2 of the surface protection film 30 at a wavelength of 550 nm may be 1000 nm or more.
  • the average in-plane retardation value Re A2 may be 1500 nm or more, 1800 nm or more, or 2000 nm or more.
  • the average in-plane retardation value Re A2 is usually 5000 nm or less, may be 4000 nm or less, or may be 3000 nm or less.
  • the average in-plane retardation value Re A2 of the surface protective film 30 can be adjusted by the in-plane retardation value of the second base film 31, for example.
  • the in-plane retardation value of the second base film 31 can be adjusted by, for example, the type of resin forming the second base film 31, the draw ratio, and the like.
  • the average in-plane retardation value Re A2 can be determined in accordance with the method for determining the average in-plane retardation value Re A1 of a release film described in Examples described later.
  • the difference ⁇ Re2 may be 130 nm or less, 110 nm or less, 100 nm or less, 80 nm or less, or 60 nm or less.
  • the difference ⁇ Re2 is typically 5 nm or more, and may be 10 nm or more. Said difference ⁇ Re2 may exceed 150 nm.
  • the difference ⁇ Re2 of the surface protection film 30 can be adjusted by the method of forming the second antistatic layer 33 on the second base film 31, or the like. For example, as will be described later, it can be adjusted by drying conditions of a coating layer formed by coating on the second base film 31 to form the second antistatic layer 33 .
  • the difference ⁇ Re2 can be determined according to the method for determining the difference ⁇ Re1 for the release film described in Examples described later.
  • the surface protection film 30 included in the optical layered body 1 has a second antistatic layer 33 in order to suppress multiple picking when the optical layered body 1 is taken out from a stack in which a plurality of optical layered bodies 1 are stacked. have.
  • the in-plane retardation value of the surface protective film may not be uniform in the plane and may vary. In the inspection of the polarizing plate 10, if the variation in the in-plane retardation value within the surface of the surface protective film becomes large, unevenness in the retardation is visually recognized in light transmission observation with crossed Nicols using the optical laminate, resulting in defects, etc.
  • the optical laminate 1 has the second antistatic layer 33, if the difference ⁇ Re2 of the surface protective film 30 is 150 nm or less, the amount of variation in the in-plane retardation value is small and the optical In light transmission observation with crossed Nicols using the laminate 1, the unevenness of the retardation is difficult to be visually recognized.
  • any of the release film 20 and the surface protective film 30 of the optical layered body 1 is arranged between the linearly polarizing layer of the polarizing plate for inspection and the linearly polarizing layer of the optical layered body 1, Since the polarizing plate 10 can be inspected by crossed Nicol light transmission observation using the optical layered body 1, the optical layered body 1 with even better inspection properties can be provided.
  • the surface resistance value of the surface protective film 30 at a temperature of 23° C. and a relative humidity of 55% RH is preferably 1.0 ⁇ 10 8 ⁇ / ⁇ or more and 1.0 ⁇ 10 11 ⁇ / ⁇ or less.
  • the surface resistance value of the surface protective film 30 may be 5.0 ⁇ 10 8 ⁇ / ⁇ or more, 1.0 ⁇ 10 9 ⁇ / ⁇ or more, or 5.0 ⁇ 10 ⁇ / ⁇ or more. It may be 10 ⁇ / ⁇ or less, 1.0 ⁇ 10 10 ⁇ / ⁇ or less, or 5.0 ⁇ 10 9 ⁇ / ⁇ or less.
  • the surface resistance value of the surface protective film 30 can be adjusted by, for example, the type and amount of the antistatic agent contained in the second antistatic layer 33 . Generally, as the amount of the antistatic agent contained in the second antistatic layer 33 increases, the conductivity of the second antistatic layer 33 improves, so the surface resistance value of the surface protection film 30 tends to decrease.
  • the surface resistance value of the surface protection film 30 is the surface resistance value of the surface protection film 30 on the side of the second antistatic layer 33, and can be measured by the method described in Examples below.
  • the surface resistance value of the surface protective film 30 is within the above range, even when the optical layered bodies 1 are taken out one by one from a stack in which a plurality of optical layered bodies 1 are stacked, two or more optical layered bodies 1 can be removed. It becomes even easier to suppress multiple picking in which the laminate 1 is taken out at the same time.
  • the peel force of the surface protective film 30 from the polarizing plate 10 at a temperature of 23° C. and a relative humidity of 55% is preferably 0.01 N/25 mm or more, may be 0.03 N/25 mm or more, and may be 0.08 N/ It may be 25 mm or more, preferably 0.5 N/25 mm or less, may be 0.4 N/25 mm or less, or may be 0.3 N/25 mm or less.
  • the peel force can be measured by the following procedure.
  • the release film 20 is peeled off from the optical laminate 1 including the surface protective film cut into a rectangle of 150 mm ⁇ 25 mm, and the first adhesive layer 11 is attached to the alkali-free glass substrate (thickness 0.7 mm, "Eagle XG”) to obtain a test piece.
  • the alkali-free glass substrate thinness 0.7 mm, "Eagle XG”
  • a sample for evaluation is prepared by storing it for 24 hours in an atmosphere of 23° C. and 55% RH.
  • the optical layered body 1 can be manufactured by laminating each layer so as to have the layer structure of the optical layered body 1 described above.
  • the optical laminate 1 can be produced by laminating the polarizing plate 10, the first pressure-sensitive adhesive layer 11, the release film 20, and, if necessary, the surface protection film 30.
  • the optical layered body 1 is, for example, a layered body in which the first adhesive layer 11 is layered on the release treatment layer 22 side of the release film 20, and the polarizing plate 10, or the surface protective film 30 and the polarizing plate 10 are layered. It may be obtained by laminating a laminate.
  • the optical layered body 1 is obtained by laminating the layered body of the first base film 21 and the release treatment layer 22 and the polarizing plate 10 with the first pressure-sensitive adhesive layer 11 interposed therebetween. It may be obtained by forming the first antistatic layer 23 on the side opposite to the release treated layer 22 side.
  • the first base film 21 is coated with a coating liquid containing an antistatic agent to form a first coating layer, the first coating layer is dried, forming the first antistatic layer 23 of the release film 20.
  • the coating liquid preferably contains an antistatic agent, which will be described later, and a solvent such as water or an organic solvent.
  • a release treatment layer 22 may be formed on the first base film 21 forming the first coating layer.
  • the release treatment layer 22 may be formed on the first base film 21 on which the first antistatic layer 23 is formed.
  • the release treatment layer 22, the first adhesive layer 11, and the polarizing plate 10 may be laminated on the first base film 21 forming the first coating layer.
  • the temperature when drying the first coating layer formed by applying the coating liquid is 60 ° C. or less. It may be 50° C. or lower, or 40° C. or lower, usually 5° C. or higher, preferably 10° C. or higher, and more preferably 15° C. or higher.
  • the drying time of the first coating layer may be set according to the drying temperature, the amount and type of solvent contained in the coating layer, and the like. It may be 10 minutes or more, usually 100 minutes or less, 60 minutes or less, or 30 minutes or less.
  • the release film 20 has an average in-plane retardation value Re A1 of 1000 nm or more at a wavelength of 550 nm.
  • Re A1 average in-plane retardation value
  • the first base film 21 is usually a highly stretched stretched film
  • the retardation is uneven due to stretching relaxation of the first base film 21 .
  • the drying temperature of the first coating layer is set to 60° C. or less. can be suppressed, and the difference ⁇ Re1 of the release film 20 can be reduced to, for example, 150 nm or less.
  • the second base film 31 is coated with a coating liquid containing an antistatic agent to form a second coating layer, and the second coating layer is dried to and forming the second antistatic layer 33 of the surface protection film 30 .
  • the coating liquid can contain an antistatic agent, which will be described later, and a solvent such as water or an organic solvent.
  • a second adhesive layer 32 may be formed on the second base film 31 forming the second coating layer.
  • the second adhesive layer 32 may be formed on the second base film 31 on which the second antistatic layer 33 is formed.
  • the second base film 31 forming the second coating layer may be laminated with the polarizing plate 10, and the second adhesive layer and the polarizing plate 10 are laminated in order from the second base film 31 side. good too.
  • the temperature when applying and drying the coating liquid is preferably 60 ° C. or less. , 50° C. or lower, or 40° C. or lower, usually 5° C. or higher, preferably 10° C. or higher, more preferably 15° C. or higher.
  • the drying time of the second coating layer may be set according to the drying temperature, the amount and type of solvent contained in the coating layer, and the like. It may be 10 minutes or more, usually 100 minutes or less, 60 minutes or less, or 30 minutes or less.
  • the second base film 31 is usually a highly stretched stretched film. Therefore, when the second coating layer is heated and dried in order to form the second antistatic layer 33, it is considered that the stretch relaxation of the second base film 31 causes unevenness in retardation.
  • the drying temperature of the second coating layer is set to 60° C. or less. can be suppressed, and the above-described difference ⁇ Re2 of the surface protection film 30 can be reduced to, for example, 150 nm or less.
  • FIG. 3 is a cross-sectional view schematically showing an optical layered body according to one embodiment of the present invention.
  • FIG. 4 is a cross-sectional view schematically showing an example of a method for inspecting the optical layered body shown in FIG. 3 with crossed Nicols.
  • the optical laminate 2 includes a first adhesive layer 11, a polarizing plate 10 including a linear polarizing layer, and a surface protective film 50 that can be peeled off from the polarizing plate 10, which are laminated in this order. ing.
  • the first pressure-sensitive adhesive layer 11 and the polarizing plate 10 are in direct contact, and the polarizing plate 10 and the surface protection film 50 are in direct contact.
  • the polarizing plate 10 and the first pressure-sensitive adhesive layer 11 included in the optical laminate 2 those described above can be used.
  • the optical laminate 2 may further have a release film 40 that can be peeled off from the first adhesive layer 11 on the opposite side of the first adhesive layer 11 from the polarizing plate 10 side.
  • the polarizing plate 10 of the optical layered body 2 can be used by incorporating it into a display device as described in the previous embodiments.
  • the optical layered body 2 has a surface protection film 50 .
  • the surface protective film 50 is used to cover and protect the surface of the polarizing plate 10 .
  • the optical layered body 2 is detachably attached to the surface of the polarizing plate 10 .
  • the surface protective film 50 has an in-plane retardation value as described later, and in the optical laminate 2, the slow axis of the surface protective film 50 and the absorption axis of the linear polarizing layer are substantially parallel or substantially orthogonal. The angles formed by the slow axis and the absorption axis when they are substantially parallel and when they are substantially orthogonal are as described in the previous embodiment.
  • the surface protection film 50 has a second base film 51 and a second antistatic layer 53 containing an antistatic agent in order from the polarizing plate 10 side of the optical laminate 2 .
  • the surface protective film 50 further has a second adhesive layer 52 on the polarizing plate 10 side of the optical laminate 1 as shown in FIG. It may be. It is preferable that the second adhesive layer 52 and the second base film 51 are in direct contact. It is preferable that the second base film 51 and the second antistatic layer 53 are in direct contact with each other.
  • FIG. 3 shows the case where the surface protection film 50 has the second adhesive layer 52.
  • the surface protection film 50 has the second adhesive layer 52 may not have
  • the second base film 51 and the polarizing plate 10 are in direct contact with each other in the optical laminate 2 .
  • the average in-plane retardation value Re A2 of the surface protective film 50 at a wavelength of 550 nm is 1000 nm or more.
  • the average in-plane retardation value Re A2 may be 1500 nm or more, 1800 nm or more, or 2000 nm or more.
  • the average in-plane retardation value Re A2 is usually 5000 nm or less, may be 4000 nm or less, or may be 3000 nm or less.
  • the average in-plane retardation value Re A2 of the surface protection film 50 can be adjusted by the method described in the previous embodiment, and can be determined by the method described in the previous embodiment.
  • the difference ⁇ Re2 may be 130 nm or less, 110 nm or less, 100 nm or less, 80 nm or less, or 60 nm or less.
  • the difference ⁇ Re2 is usually 5 nm or more, may be 10 nm or more, or may be 20 nm or more.
  • the difference ⁇ Re2 of the surface protective film 50 can be adjusted by the method described in the previous embodiment, and can be determined by the method described in the previous embodiment.
  • the surface protective film 50 included in the optical layered body 2 has a second antistatic layer 53 in order to suppress multiple pick-ups.
  • the in-plane retardation value of the surface protective film may not be uniform in the plane and may vary.
  • the polarizing plate 10 may be inspected by transmission observation of light with crossed Nicols using the optical layered body 2 . In this case, when the variation in the in-plane retardation value in the surface of the surface protective film increases, the retardation becomes uneven in cross Nicol light transmission observation using the optical laminate including the polarizing plate and the surface protective film. This makes it difficult to properly inspect the polarizing plate for defects. In particular, as shown in FIG.
  • the optical layered body 2 even if it has the second antistatic layer 53, the difference ⁇ Re2 of the surface protection film 50 is within the above range, so the amount of variation in the in-plane retardation value is small. , the unevenness of the retardation is difficult to be visually recognized in transmission observation of light with crossed Nicols using the optical layered body 2 . Therefore, since the polarizing plate 10 can be inspected by transmission observation of light in crossed Nicols using the optical layered body 2, the optical layered body 2 is excellent in inspectability.
  • the surface resistance value of the surface protection film 50 at a temperature of 23°C and a relative humidity of 55% RH can be within the range of the surface resistance value of the surface protection film described in the previous embodiment.
  • the peel strength of the surface protective film 50 from the polarizing plate 10 at a temperature of 23°C and a relative humidity of 55% can be within the range of the surface protective film described in the previous embodiment.
  • the optical laminate 2 may have a release film 40 .
  • the release film 40 is used to cover and protect the first adhesive layer 11 .
  • the optical layered body 2 is laminated so as to be peelable from the first pressure-sensitive adhesive layer 11 .
  • the release film 40 may have an in-plane retardation as described later.
  • the release film 40 has an in-plane retardation, in the optical laminate 2, the slow axis of the release film 40 and the absorption axis of the linearly polarizing layer are substantially parallel or substantially orthogonal. preferable.
  • the angles formed by the slow axis and the absorption axis when they are substantially parallel and substantially orthogonal are as described in the previous embodiments.
  • the release film 40 has a release treatment layer 42 and a first base film 41 in order from the first adhesive layer 11 side of the optical layered body 2 . It is preferable that the release treatment layer 42 and the first base film 41 are in direct contact with each other.
  • the release film 40 may further have a first antistatic layer 43 containing an antistatic agent on the side of the first base film 41 opposite to the release treated layer 42 side. It is preferable that the first base film 41 and the first antistatic layer 43 are in direct contact with each other.
  • the average in-plane retardation value Re A1 of the release film 40 at a wavelength of 550 nm is 1000 nm or more.
  • the average in-plane retardation value Re A1 may be 1500 nm or more, 1800 nm or more, or 2000 nm or more.
  • the average in-plane retardation value Re A1 is usually 5000 nm or less, may be 4000 nm or less, or may be 3000 nm or less.
  • the average in-plane retardation value Re A1 of the release film 40 can be adjusted by the method described in the previous embodiment, and can be determined by the method described in the previous embodiment.
  • Re ma1 is the maximum in-plane retardation value of the release film 40 at a wavelength of 550 nm
  • Re mi1 is the minimum in-plane retardation value of the release film 40 at a wavelength of 550 nm.
  • ⁇ Re mi1 is 150 nm or less.
  • the difference ⁇ Re1 may be 130 nm or less, 110 nm or less, 100 nm or less, 80 nm or less, or 60 nm or less.
  • the difference ⁇ Re1 is usually 5 nm or more, may be 10 nm or more, or may be 20 nm or more. Said difference ⁇ Re1 may exceed 150 nm.
  • the difference ⁇ Re1 of the release film 40 can be adjusted by the method described in the previous embodiment, and can be determined by the method described in the previous embodiment.
  • the release film 40 included in the optical layered body 2 has a first antistatic layer 43 in order to suppress multiple removal and the like.
  • the in-plane retardation value of the release film may not be uniform within the plane and may vary.
  • the release film 40 of the optical layered body 2 is placed in the crossed Nicols formed between the linearly polarizing layer of the polarizing plate for inspection and the linearly polarizing layer of the optical layered body 2.
  • the variation in the in-plane retardation value in the plane of the release film becomes large, the unevenness of the retardation is visually recognized in the transmission observation of light with crossed Nicols using the optical laminate, and the polarizing plate is inspected for defects.
  • the optical laminate 2 has the first antistatic layer 43, if the difference ⁇ Re1 of the release film 40 is 150 nm or less, the amount of change in the in-plane retardation value is small, and the optical laminate In light transmission observation with crossed nicols using the body 2, the unevenness of the retardation is difficult to be visually recognized.
  • any of the surface protective film 50 and the release film 40 of the optical layered body 2 is arranged between the linearly polarizing layer of the polarizing plate for inspection and the linearly polarizing layer of the optical layered body 1, Since the polarizing plate 10 can be inspected by crossed Nicol light transmission observation using the optical layered body 2, the optical layered body 2 with even better inspection properties can be provided.
  • the surface resistance value of the release film 40 at a temperature of 23°C and a relative humidity of 55% RH can be within the range of the surface resistance value of the release film described in the previous embodiment. By setting the surface resistance value of the release film 40 within the above-described range, it becomes easier to suppress multiple layers of the optical layered body.
  • the optical layered body 2 can be manufactured by laminating each layer so as to have the layer structure of the optical layered body 2 described above.
  • the optical layered body 2 can be produced by laminating the first adhesive layer 11, the polarizing plate 10, the surface protection film 50, and, if necessary, the release film 40 described above.
  • the optical laminate 2 is a laminate obtained by laminating the surface protective film 50 and the polarizing plate 10, and the first adhesive layer 11 or the first adhesive layer 11 is laminated on the release treatment layer 42 side of the release film 40. You may obtain by laminating
  • the optical laminate 2 may be obtained after obtaining a laminate in which the second base film 51 and the polarizing plate 10 are laminated, or after the second base film 51, the second pressure-sensitive adhesive layer 52, and the polarizing plate 10 are laminated.
  • the second antistatic layer 53 may be formed on the opposite side of the second base film 51 from the polarizing plate 10 side after obtaining a laminated body laminated in order.
  • the method for producing the optical laminate 2 a method of forming the second antistatic layer 53 on the second base film 51 to form the surface protection film 50, and a method of forming the first antistatic layer 43 on the first base film 41. is formed to form the release film 40, the method described in the previous embodiment can be mentioned.
  • the temperature for drying the coating liquid is also preferably within the range described in the previous embodiment from the viewpoint of reducing the variation in the in-plane retardation.
  • thermoplastic resins forming the first base film include polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyolefin resins such as polyethylene, polypropylene and ethylene/propylene copolymer; cyclic polyolefin resins having cyclo- and norbornene structures.
  • the first base film is preferably a polyester resin film, and more preferably a stretched polyester resin film that has been stretched.
  • (Meth)acryl means at least one selected from acryl and methacryl.
  • the average in-plane retardation value of the first base film at a wavelength of 550 nm is usually 1000 nm or more, may be 1500 nm or more, may be 1800 nm or more, or may be 2000 nm or more, and It is usually 5000 nm or less, may be 4000 nm or less, or may be 3000 nm or less.
  • the average in-plane retardation value can be determined according to the method for determining the average in-plane retardation value ReA1 of a release film described later in Examples.
  • the thickness of the first base film is, for example, 5 ⁇ m or more, may be 10 ⁇ m or more, may be 50 ⁇ m or more, or may be 70 ⁇ m or more, and may be, for example, 300 ⁇ m or less, or 200 ⁇ m or less. 150 ⁇ m or less, 120 ⁇ m or less, or 100 ⁇ m or less.
  • the release-treated layer included in the release film is a layer formed by subjecting one surface of the first base film to a release treatment.
  • the surface of the first base film is coated with a release agent composition containing a known release agent such as a fluorine compound, a silicone compound, a long-chain alkyl compound, a fatty acid amide compound, and the like. It is a coating layer formed by
  • the thickness of the release treatment layer can be 10 nm or more and 2000 nm or less, preferably 10 nm or more and 1000 nm or less, and more preferably 10 nm or more and 500 nm or less.
  • the first antistatic layer that the release film may contain contains an antistatic agent.
  • known antistatic agents can be used, for example, conductive polymers; conductive fine particles such as metal fine particles, metal oxide fine particles, or metal-coated fine particles; electrolyte salts and organopolysiloxanes; ionic compounds; surfactants (cationic, anionic and amphoteric surfactants); at least one of hydrolyzable organosilicon compounds and polycondensates thereof, etc. .
  • the first antistatic layer can contain one or more of the antistatic agents described above. When the antistatic layer contains an antistatic agent, the electrical resistance of the antistatic layer is lowered, so that antistatic performance can be imparted to the release film and, in turn, to the optical laminate.
  • Examples of conductive fine particles include silver powder, copper powder, nickel powder, zinc oxide (ZnO), tin oxide (SnO 2 ), antimony-doped tin oxide (ATO), and tin-doped indium oxide (ITO). .
  • Examples of the ion-conductive composition include an electrolyte salt and an organopolysiloxane represented by the following formula.
  • R 11 represents a monovalent organic group
  • R 12 to R 14 represent an alkylene group
  • R 15 represents hydrogen or a monovalent organic group.
  • m is an integer of 0-100
  • n is an integer of 1-100.
  • the arrangement order of the -(-Si(R 11 R 11 )O-)- unit and the -(-Si(R 11 R 12 )O-)- unit is arbitrary.
  • a and b are each an integer of 0 to 100 and not 0 at the same time.
  • the arrangement order of -(-R 13 O-)- and -(-R 14 O-)- is arbitrary.
  • Electrolyte salts include electrolyte salts whose cations are cations of metals belonging to Group I or Group II of the periodic table. Examples of cations include cations such as lithium, sodium, potassium, magnesium, calcium, and barium.
  • An ionic compound is, for example, a compound having an inorganic or organic cation and an inorganic or organic anion.
  • inorganic cations include alkali metal ions such as lithium cation [Li + ], sodium cation [Na + ], potassium cation [K + ], beryllium cation [Be 2+ ], magnesium cation [Mg 2+ ], calcium Examples thereof include alkaline earth metal ions such as cations [Ca 2+ ].
  • organic cations examples include imidazolium cations, pyridinium cations, pyrrolidinium cations, ammonium cations, sulfonium cations, phosphonium cations, and piperidinium cations.
  • inorganic anions include chloride anion [Cl ⁇ ], bromide anion [Br ⁇ ], iodide anion [I ⁇ ], tetrachloroaluminate anion [AlCl 4 ⁇ ], heptachlorodialuminate anion [Al 2 Cl 7 ⁇ ], tetrafluoroborate anion [BF 4 ⁇ ], hexafluorophosphate anion [PF 6 ⁇ ], perchlorate anion [ClO 4 ⁇ ], nitrate anion [NO 3 ⁇ ], hexafluoroarsenate anion [AsF 6 - ], hexafluoroantimonate anion [SbF 6 - ], hexafluoroniobate anion [NbF 6 - ], hexafluorotantalate anion [TaF 6 - ] , dicyanamide anion [(CN) 2 N - ], and the like
  • organic anions examples include acetate anion [CH 3 COO ⁇ ], trifluoroacetate anion [CF 3 COO ⁇ ], methanesulfonate anion [CH 3 SO 3 ⁇ ], trifluoromethanesulfonate anion [CF 3 SO 3 ⁇ ], p-toluenesulfonate anion [p-CH 3 C 6 H 4 SO 3 ⁇ ], bis(fluorosulfonyl)imide anion [(FSO 2 ) 2 N ⁇ ], bis(trifluoromethanesulfonyl)imide anion [(CF 3 SO 2 ) 2 N ⁇ ], tris(trifluoromethanesulfonyl)methanide anion [(CF 3 SO 2 ) 3 C ⁇ ], dimethylphosphinate anion [(CH 3 ) 2 POO ⁇ ], (poly)hydrofluorofluoride anion [ F(HF)n ⁇ ] (n is about 1 to
  • ionic compound can be appropriately selected from combinations of the above cationic components and anionic components.
  • examples of ionic compounds having an organic cation are listed below by classifying them according to the structure of the organic cation.
  • Pyridinium salt N-hexylpyridinium hexafluorophosphate, N-octylpyridinium hexafluorophosphate, N-octyl-4-methylpyridinium hexafluorophosphate, N-butyl-4-methyllupyridinium hexafluorophosphate, N-decylpyridinium bis(fluorosulfonyl)imide, N-dodecylpyridinium bis(fluorosulfonyl)imide, N-tetradecylpyridinium bis(fluorosulfonyl)imide, N-hexadecylpyridinium bis(fluorosulfonyl)imide, N-dodecyl-4-methylpyridinium bis(fluorosulfonyl)imide, N-tetradecyl-4-methylpyridinium bis(fluorosulfonyl)imide
  • Imidazolium salt 1-ethyl-3-methylimidazolium hexafluorophosphate, 1-ethyl-3-methylimidazolium p-toluenesulfonate, 1-ethyl-3-methylimidazolium bis(fluorosulfonyl)imide, 1-ethyl-3-methylimidazolium bis(trifluoromethanesulfonyl)imide, 1-butyl-3-methylimidazolium methanesulfonate, 1-Butyl-3-methylimidazolium bis(fluorosulfonyl)imide.
  • Pyrrolidinium salt N-butyl-N-methylpyrrolidinium hexafluorophosphate, N-butyl-N-methylpyrrolidinium bis(fluorosulfonyl)imide, N-Butyl-N-methylpyrrolidinium bis(trifluoromethanesulfonyl)imide.
  • Quaternary ammonium salt tetrabutylammonium hexafluorophosphate, tetrabutylammonium p-toluenesulfonate, (2-hydroxyethyl)trimethylammonium bis(trifluoromethanesulfonyl)imide, (2-hydroxyethyl)trimethylammonium dimethylphosphinate.
  • Examples of ionic compounds having inorganic cations include the following. lithium bromide, lithium iodide, lithium tetrafluoroborate, lithium hexafluorophosphate, lithium thiocyanate, lithium perchlorate, lithium trifluoromethanesulfonate, lithium bis(fluorosulfonyl)imide, lithium bis(trifluoromethanesulfonyl)imide, lithium bis(pentafluoroethanesulfonyl)imide, lithium tris(trifluoromethanesulfonyl)methanide, lithium p-toluenesulfonate, sodium hexafluorophosphate, sodium bis(fluorosulfonyl)imide, sodium bis(trifluoromethanesulfonyl)imide, sodium p-toluenesulfonate, potassium hexafluorophosphate, potassium bis(fluorosulfonyl)imide,
  • ionic compounds may be used alone or in combination of two or more.
  • surfactants examples include hydrocarbon-based surfactants, fluorine-based surfactants, and silicone-based surfactants.
  • a hydrolyzable organosilicon compound is a compound in which a non-hydrolyzable organic group and a hydrolyzable organic or inorganic group are bonded to a silicon atom, or a compound in which a hydrolyzable organic group is bonded to a silicon atom.
  • the organic group may have a carbon atom at the bonding position, or may have another atom at the bonding position.
  • the hydrolyzable organosilicon compound can be represented by the following formula. Si(T 1 ) q (T 2 ) 4-q [In the formula, T 1 represents a hydrogen atom or a non-hydrolyzable organic group, T 2 represents a hydrolyzable group, and q represents an integer of 0-3. ]
  • the non-hydrolyzable organic group represented by T 1 typically includes an alkyl group having about 1 to 4 carbon atoms, an alkenyl group having about 2 to 4 carbon atoms, and an aryl group such as a phenyl group.
  • Hydrolyzable groups represented by T2 include, for example, alkoxy groups having about 1 to 5 carbon atoms such as methoxy group and ethoxy group, acyloxy groups such as acetoxy group and propionyloxy group, chlorine atom and bromine atom. and substituted silylamino groups such as a trimethylsilylamino group.
  • the hydrolyzable organosilicon compound may be an alkoxysilane compound, a halogenated silane compound, an acyloxysilane compound, a silazane compound, or the like.
  • These hydrolyzable organosilicon compounds are aryl groups , vinyl groups, allyl groups, (meth)acryloyloxy groups, epoxy groups, amino groups, mercapto groups, fluoroalkyl It may have a substituent such as a group.
  • “(Meth)acryloyl” means at least one selected from acryloyl and methacryloyl.
  • hydrolyzable organosilicon compounds examples include halogenated silane compounds such as methyltrichlorosilane; tetramethoxysilane, tetraethoxysilane, methyltrimethoxysilane, phenyltrimethoxysilane, phenyltriethoxysilane, dimethyldimethoxysilane.
  • hydrolyzable organosilicon compound a hydrolysis product obtained by partially hydrolyzing the hydrolyzable organosilicon compound as described above may be used.
  • hydrolyzable organosilicon compound a multimer obtained by condensing the above hydrolysis product to form an oligomer or polymer may be used.
  • These hydrolysis products and polymers can be produced by adding acids such as hydrochloric acid, phosphoric acid, acetic acid and sulfuric acid, or bases such as sodium hydroxide and sodium acetate, to the hydrolyzable organosilicon compound. can.
  • a condensation polymer obtained by hydrolyzing and polycondensing the hydrolyzable organosilicon compound as described above may be used.
  • a known method can be used to hydrolyze the above hydrolyzable organosilicon compound. Specifically, a hydrolyzable organosilicon compound is dissolved in a predetermined amount of an organic solvent in an amount required for a predetermined solid content concentration to form a uniform solution, which is then hydrolyzed in the presence of a catalyst. When no organic solvent is used, a hydrolyzable organosilicon compound may be hydrolyzed by adding to a uniform solution of water and a catalyst an amount required to achieve a predetermined solid content concentration.
  • hydrolysis may be carried out by adding an amount of water required for the desired hydrolysis rate in the presence of an acid or alkali catalyst.
  • the hydrolysis catalyst include acids such as hydrochloric acid, phosphoric acid, sulfuric acid, and acetic acid, and basic hydroxide catalysts such as LiOH, NaOH, and KOH. .01 to 10% by weight is used.
  • a reaction temperature of room temperature to 50° C. is sufficient for the hydrolysis reaction, and the reaction time varies depending on the reaction temperature and amount of catalyst, but is generally 1 to 24 hours.
  • a condensation polymer of the hydrolyzable organosilicon compound is prepared by the above hydrolysis reaction.
  • the polycondensate of the hydrolyzable organosilicon compound gels on the surface to be coated, it has many silanol groups (Si—OH) containing hydroxyl groups on the surface, which is effective in developing antistatic performance. become something. Since the polycondensate of the hydrolyzable organosilicon compound is prepared by hydrolysis, the end groups of the polycondensate contain OH groups, which are also effective in exhibiting antistatic properties.
  • the hydrolyzable organosilicon compound and its condensation polymer may be used alone, or may be used in the form of a mixture of the hydrolyzable organosilicon compound and its condensate.
  • the first antistatic layer can be formed, for example, by applying a coating liquid containing an antistatic agent to the surface of the first base film.
  • the coating liquid usually contains an antistatic agent, a solvent (including water), and, if necessary, a curable resin such as a (meth)acrylic compound that is cured by heat or active energy ray irradiation.
  • the surface of the first base film may be subjected to surface activation treatment such as corona treatment, plasma treatment, primer treatment, anchor coating treatment, and the like. This improves the adhesion between the first antistatic layer and the first base film, and the wettability of the coating liquid to the first base film.
  • the solvent is used to adjust the concentration and viscosity of the coating liquid, the thickness of the coating layer, etc.
  • the solvent to be used may be appropriately selected, for example, water; alcohols such as methanol, ethanol, propanol, isopropanol, n-butanol, 2-butanol, isobutanol, tert-butanol; Alkoxy alcohols such as butoxyethanol, 3-methoxypropanol, 1-methoxy-2-propanol and 1-ethoxy-2-propanol; ketols such as diacetone alcohol; ketones such as acetone, methyl ethyl ketone and methyl isobutyl ketone; toluene , xylene and the like; esters such as ethyl acetate and butyl acetate; and ethers such as dioxane and tetrahydrofuran.
  • the amount of the solvent used is appropriately selected according to the material, shape, coating
  • Examples of methods for applying a coating liquid to the surface of the first base film include micro gravure coating, roll coating, dipping coating, flow coating, spin coating, die coating, cast transfer, and spray coating. law, etc.
  • the first antistatic layer is preferably formed by drying a coating layer formed by applying a coating liquid to the surface of the first base film.
  • the drying temperature is preferably 60° C. or lower as described above.
  • the thickness of the first antistatic layer can be 10 nm or more and 1000 nm or less. It may be 100 nm or more. If the thickness of the first antistatic layer is less than 10 nm, the adhesion, antistatic properties, and strength may not be sufficient. There is also the possibility of doing so.
  • a 1st adhesive layer is an adhesive layer formed using the adhesive composition.
  • the pressure-sensitive adhesive composition or the reaction product of the pressure-sensitive adhesive composition develops adhesiveness by attaching itself to an adherend such as a metal layer, and is referred to as a so-called pressure-sensitive adhesive. be.
  • the adhesive layer formed using the active-energy-ray-curable adhesive composition mentioned later can adjust a crosslinking degree and adhesive strength by irradiating an active-energy-ray.
  • the adhesive composition conventionally known adhesives having excellent optical transparency can be used without particular limitation.
  • adhesives containing base polymers such as acrylic polymers, urethane polymers, silicone polymers, and polyvinyl ethers.
  • Compositions can be used.
  • the adhesive composition may also be an active energy ray-curable adhesive composition, a heat-curable adhesive composition, or the like.
  • a pressure-sensitive adhesive composition using an acrylic resin as a base polymer which is excellent in transparency, adhesive strength, removability (reworkability), weather resistance, heat resistance, etc.
  • the pressure-sensitive adhesive layer preferably comprises a reaction product of a pressure-sensitive adhesive composition containing a (meth)acrylic resin, a cross-linking agent and a silane compound, and may contain other components.
  • the adhesive composition for forming the first adhesive layer can contain, for example, base polymers such as acrylic polymer, urethane polymer, silicone polymer and polyvinyl ether.
  • the adhesive composition may be an active energy ray-curable adhesive, a heat-curable adhesive, or the like.
  • a pressure-sensitive adhesive containing a (meth)acrylic resin as a base polymer which is excellent in transparency, adhesive strength, removability (reworkability), weather resistance, heat resistance, etc., is preferable.
  • the pressure-sensitive adhesive layer is preferably composed of a reaction product of a pressure-sensitive adhesive containing a (meth)acrylic resin, a cross-linking agent, and a silane compound, and may contain other components.
  • the first adhesive layer may be formed using an active energy ray-curable adhesive.
  • the active energy ray-curable pressure-sensitive adhesive is obtained by blending an ultraviolet-curable compound such as a polyfunctional acrylate into the above-described pressure-sensitive adhesive composition, forming a layer using this, and then irradiating it with ultraviolet rays to cure it. A harder adhesive layer can be formed.
  • Active energy ray-curable pressure-sensitive adhesives have the property of being cured by being irradiated with energy rays such as ultraviolet rays and electron beams. Since the active energy ray-curable adhesive has adhesiveness even before energy ray irradiation, it adheres to the adherend and has the property that it can be cured by energy ray irradiation to adjust the adhesive strength. .
  • the thickness of the first pressure-sensitive adhesive layer is not particularly limited, but is preferably 5 ⁇ m or more, may be 10 ⁇ m or more, may be 15 ⁇ m or more, may be 20 ⁇ m or more, or may be 25 ⁇ m or more. Well, it is usually 300 ⁇ m or less, may be 250 ⁇ m or less, may be 100 ⁇ m or less, or may be 50 ⁇ m or less.
  • the linear polarizing layer included in the polarizing plate has the property of transmitting linearly polarized light having a vibration plane perpendicular to the absorption axis when unpolarized light is incident.
  • the linear polarizing layer may be a polyvinyl alcohol-based resin film (hereinafter sometimes referred to as "PVA-based film”) in which iodine is adsorbed and oriented, and has a composition containing a compound having absorption anisotropy and liquid crystallinity. It may be a film containing a liquid crystalline polarizing layer formed by applying a substance to a substrate film.
  • the compound having absorption anisotropy and liquid crystallinity may be a mixture of a dye having absorption anisotropy and a compound having liquid crystallinity, or may be a dye having absorption anisotropy and liquid crystallinity.
  • the linear polarizing layer is preferably a PVA-based film in which iodine is adsorbed and oriented.
  • the linear polarizing layer which is a PVA-based film, is obtained by subjecting a PVA-based film such as a polyvinyl alcohol film, a partially formalized polyvinyl alcohol film, an ethylene-vinyl acetate copolymer-based partially saponified film, to a dyeing treatment with iodine and a stretching treatment. and the like.
  • the PVA-based film having iodine adsorbed and oriented by the dyeing treatment may be treated with an aqueous boric acid solution, followed by a washing step of washing off the aqueous boric acid solution.
  • a known method can be adopted for each step.
  • Polyvinyl alcohol-based resin (hereinafter sometimes referred to as "PVA-based resin”) can be produced by saponifying polyvinyl acetate-based resin.
  • the polyvinyl acetate-based resin may be polyvinyl acetate, which is a homopolymer of vinyl acetate, or may be a copolymer of vinyl acetate and another monomer that can be copolymerized with vinyl acetate.
  • Other monomers copolymerizable with vinyl acetate include, for example, unsaturated carboxylic acids, olefins, vinyl ethers, unsaturated sulfonic acids, and acrylamides having an ammonium group.
  • the saponification degree of the PVA-based resin is usually about 85 to 100 mol%, preferably 98 mol% or more.
  • the PVA-based resin may be modified, and for example, polyvinyl formal or polyvinyl acetal modified with aldehydes may be used.
  • the average degree of polymerization of the PVA-based resin is usually about 1,000 to 10,000, preferably about 1,500 to 5,000.
  • the degree of saponification and average degree of polymerization of the PVA-based resin can be obtained according to JIS K 6726 (1994). If the average degree of polymerization is less than 1,000, it is difficult to obtain desirable polarizing performance, and if it exceeds 10,000, film workability may be poor.
  • a method for producing a linear polarizing layer involves preparing a base film, applying a solution of a resin such as a PVA-based resin on the base film, and performing drying or the like to remove the solvent. may include a step of forming a resin layer on the substrate.
  • a primer layer can be formed in advance on the surface of the substrate film on which the resin layer is formed.
  • the base film a film using a resin material described as a thermoplastic resin used for forming the first protective film, which will be described later, can be used. Examples of the material for the primer layer include a resin obtained by cross-linking the hydrophilic resin used for the linear polarizing layer.
  • the amount of solvent such as moisture in the resin layer is adjusted as necessary, then the base film and the resin layer are uniaxially stretched, and then the resin layer is dyed with iodine to adsorb and align iodine on the resin layer. .
  • the resin layer in which iodine is adsorbed and oriented is treated with an aqueous boric acid solution, followed by a washing step of washing off the aqueous boric acid solution.
  • a resin layer in which iodine is adsorbed and oriented that is, a PVA-based film to be a linear polarizing layer is produced.
  • a known method can be adopted for each step.
  • the amount of boric acid in the boric acid-containing aqueous solution for treating the PVA-based film or resin layer in which iodine is adsorbed and oriented is usually about 2 to 15 parts by mass, preferably 5 to 12 parts by mass, per 100 parts by mass of water.
  • This boric acid-containing aqueous solution preferably contains potassium iodide.
  • the amount of potassium iodide in the boric acid-containing aqueous solution is usually about 0.1 to 15 parts by mass, preferably about 5 to 12 parts by mass, per 100 parts by mass of water.
  • the immersion time in the boric acid-containing aqueous solution is usually about 60 to 1,200 seconds, preferably about 150 to 600 seconds, more preferably about 200 to 400 seconds.
  • the temperature of the boric acid-containing aqueous solution is usually 50°C or higher, preferably 50 to 85°C, more preferably 60 to 80°C.
  • Uniaxial stretching of the PVA-based film, the substrate film and the resin layer may be performed before dyeing, during dyeing, or during boric acid treatment after dyeing. Uniaxial stretching may be performed in each of a plurality of stages.
  • the PVA-based film, the base film and the resin layer may be uniaxially stretched in the MD direction (film transport direction). You may stretch
  • the PVA-based film, the base film and the resin layer may be uniaxially stretched in the TD direction (the direction perpendicular to the film transport direction), in which case a so-called tenter method can be used.
  • the stretching may be dry stretching in which the film is stretched in the atmosphere, or may be wet stretching in which the PVA-based film or resin layer is swollen with a solvent and then stretched.
  • the draw ratio is 4 times or more, preferably 5 times or more, and particularly preferably 5.5 times or more. Although there is no particular upper limit for the draw ratio, it is preferably 8 times or less from the viewpoint of suppressing breakage and the like.
  • a linear polarizing layer produced by a manufacturing method using a base film can be obtained by peeling off the base film after laminating a protective layer.
  • the thickness of the linear polarizing layer which is a PVA-based film, is preferably 1 ⁇ m or more, may be 2 ⁇ m or more, or may be 5 ⁇ m or more, and is preferably 30 ⁇ m or less, and 15 ⁇ m or less. is more preferable, and may be 10 ⁇ m or less, or may be 8 ⁇ m or less.
  • a film containing a liquid crystalline polarizing layer is obtained by coating a base film with a composition containing a dye having liquid crystallinity and absorption anisotropy, or a composition containing a dye having absorption anisotropy and a polymerizable liquid crystal.
  • a linear polarizing layer obtained by As the base film for example, a film using a resin material described as a thermoplastic resin used for forming a protective layer to be described later can be used.
  • the film containing a liquid crystalline polarizing layer include the polarizing layer described in JP-A-2013-33249.
  • the total thickness of the substrate film and the linearly polarizing layer formed as described above is preferably as small as possible. It is 30 ⁇ m or less, more preferably 0.5 ⁇ m or more and 25 ⁇ m or less.
  • the protective layer that may be included in the polarizing plate may be laminated so as to be in direct contact with the linearly polarizing layer, but is preferably laminated via a bonding layer.
  • the protective layer is preferably a resin layer, more preferably a resin film.
  • resin films include films formed from thermoplastic resins that are excellent in transparency, mechanical strength, thermal stability, water barrier properties, isotropy, stretchability, and the like.
  • thermoplastic resins include cellulose resins such as triacetyl cellulose; polyester resins such as polyethylene terephthalate and polyethylene naphthalate; polyethersulfone resins; polysulfone resins; polycarbonate resins; polyamide resins such as nylon and aromatic polyamides; Resin; polyolefin resin such as polyethylene, polypropylene, ethylene/propylene copolymer; cyclic polyolefin resin having cyclo-type and norbornene structure (also referred to as norbornene-based resin); (meth)acrylic resin; polyarylate resin; polystyrene resin; polyvinyl alcohol Resins, as well as mixtures thereof, may be mentioned.
  • cellulose resins such as triacetyl cellulose
  • polyester resins such as polyethylene terephthalate and polyethylene naphthalate
  • polyethersulfone resins polysulfone resins
  • polycarbonate resins polyamide resins such as nylon and aromatic polyamide
  • the protective layer may have antireflection properties, antiglare properties, hard coat properties, etc. (Hereinafter, a protective film having such properties may be referred to as a "functional protective film”.).
  • a surface functional layer such as an antireflection layer, an antiglare layer, or a hard coat layer may be laminated on the linearly polarizing layer or the protective layer.
  • the surface functional layer is preferably provided so as to be in direct contact with the protective layer.
  • the surface functional layer is preferably provided on the side of the protective layer opposite to the linearly polarizing layer side, and is preferably provided on the side of the polarizing plate opposite to the first pressure-sensitive adhesive layer side.
  • the thickness of the protective layer is preferably 3 ⁇ m or more, more preferably 5 ⁇ m or more, and is preferably 50 ⁇ m or less, more preferably 30 ⁇ m or less.
  • Examples of the bonding layer that the polarizing plate may have include a pressure-sensitive adhesive layer and an adhesive layer.
  • the adhesive layer include an adhesive layer formed using the adhesive composition described for the first adhesive layer.
  • the thickness of the adhesive layer is not particularly limited, but is preferably 5 ⁇ m or more, may be 10 ⁇ m or more, may be 15 ⁇ m or more, may be 20 ⁇ m or more, or may be 25 ⁇ m or more, It is usually 300 ⁇ m or less, may be 250 ⁇ m or less, may be 100 ⁇ m or less, or may be 50 ⁇ m or less.
  • the adhesive layer can be formed by curing the curable component in the adhesive composition.
  • the adhesive composition for forming the adhesive layer include adhesives other than pressure-sensitive adhesives (adhesives), such as water-based adhesives and active energy ray-curable adhesives.
  • water-based adhesives include adhesives in which polyvinyl alcohol resin is dissolved or dispersed in water.
  • the method of drying when a water-based adhesive is used is not particularly limited. For example, a method of drying using a hot air dryer or an infrared ray dryer can be employed.
  • Active energy ray-curable adhesives include, for example, solvent-free active energy ray-curable adhesives containing curable compounds that are cured by irradiation with active energy rays such as ultraviolet rays, visible light, electron beams, and X-rays. mentioned. Adhesion between layers can be improved by using a non-solvent active energy ray-curable adhesive.
  • the active energy ray-curable adhesive preferably contains either one or both of a cationic polymerizable curable compound and a radically polymerizable curable compound because it exhibits good adhesiveness.
  • the active energy ray-curable adhesive can further contain a cationic polymerization initiator such as a photocationic polymerization initiator or a radical polymerization initiator for initiating the curing reaction of the curable compound.
  • Examples of cationic polymerizable curable compounds include alicyclic epoxy compounds having an epoxy group bonded to an alicyclic ring, and polyfunctional aliphatic epoxy compounds having two or more epoxy groups and no aromatic ring. , monofunctional epoxy groups having one epoxy group (excluding those contained in alicyclic epoxy compounds), polyfunctional aromatic epoxy compounds having two or more epoxy groups and aromatic rings, etc. compounds; oxetane compounds having one or more oxetane rings in the molecule; and combinations thereof.
  • radically polymerizable curable compounds include (meth)acrylic compounds (compounds having one or more (meth)acryloyloxy groups in the molecule), other radically polymerizable double bonds. vinyl-based compounds, or combinations thereof.
  • the active energy ray-curable adhesive can contain a sensitizer such as a photosensitizer as needed.
  • a sensitizer By using a sensitizer, the reactivity is improved, and the mechanical strength and adhesive strength of the adhesive layer can be further improved.
  • a known sensitizer can be appropriately applied.
  • the blending amount is preferably in the range of 0.1 to 20 parts by mass with respect to 100 parts by mass as the total amount of the active energy ray-curable adhesive.
  • Active energy ray-curable adhesives may optionally contain ion trapping agents, antioxidants, chain transfer agents, tackifiers, thermoplastic resins, fillers, flow control agents, plasticizers, antifoaming agents, and antistatic agents. Additives such as agents, leveling agents, solvents and the like can be included.
  • an adhesive layer can be formed by irradiating an active energy ray such as ultraviolet rays, visible light, electron beams, and X-rays to cure the adhesive coating layer.
  • an active energy ray such as ultraviolet rays, visible light, electron beams, and X-rays
  • ultraviolet rays are preferable, and as a light source in this case, a low-pressure mercury lamp, a medium-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high-pressure mercury lamp, a chemical lamp, a black light lamp, a microwave-excited mercury lamp, a metal halide lamp, etc. can be used. can.
  • the thickness of the adhesive layer is preferably 0.1 ⁇ m or more, and may be 0.5 ⁇ m or more, and preferably 10 ⁇ m or less, and may be 5 ⁇ m or less.
  • thermoplastic resin forming the first base film A film formed from a thermoplastic resin can be used as the second base film contained in the surface protection film, and is usually a stretched film that has undergone a stretching treatment.
  • thermoplastic resin forming the first base film examples include those described as the thermoplastic resin forming the first base film.
  • the second base film may be formed of a self-adhesive film.
  • a self-adhesive film is a film that adheres by itself without providing a means for adhesion such as a second adhesive layer and that can maintain the adhered state.
  • a self-adhesive film can be formed using, for example, a polypropylene-based resin, a polyethylene-based resin, or the like.
  • the thickness of the second base film is, for example, 5 ⁇ m or more, may be 10 ⁇ m or more, may be 50 ⁇ m or more, or may be 70 ⁇ m or more, and may be, for example, 300 ⁇ m or less, or 200 ⁇ m or less. 150 ⁇ m or less, 120 ⁇ m or less, or 100 ⁇ m or less.
  • the average in-plane retardation value of the second base film at a wavelength of 550 nm is usually 1000 nm or more, may be 1500 nm or more, may be 1800 nm or more, or may be 2000 nm or more, and It is usually 5000 nm or less, may be 4000 nm or less, or may be 3000 nm or less.
  • the average in-plane retardation value can be determined according to the method for determining the average in-plane retardation value Re A1 of a release film described later in Examples.
  • the 2nd adhesive layer contained in a surface protection film is an adhesive layer formed using the adhesive composition.
  • the adhesive composition include those described as the adhesive composition for forming the first adhesive layer.
  • the thickness of the second pressure-sensitive adhesive layer is not particularly limited, but is preferably 5 ⁇ m or more, may be 10 ⁇ m or more, may be 15 ⁇ m or more, may be 20 ⁇ m or more, or may be 25 ⁇ m or more. Well, it is usually 300 ⁇ m or less, may be 250 ⁇ m or less, may be 100 ⁇ m or less, or may be 50 ⁇ m or less.
  • the second antistatic layer that the surface protection film may contain contains an antistatic agent.
  • the antistatic agent includes the antistatic agent used for forming the first antistatic layer.
  • the second antistatic layer can contain one or more of the antistatic agents described above. When the antistatic layer contains an antistatic agent, the electrical resistance of the antistatic layer is lowered, so that the surface protection film and, in turn, the optical laminate can be provided with antistatic performance.
  • the second antistatic layer can be formed, for example, in the same manner as the first antistatic layer, except that the second base film is used instead of the first base film.
  • the second antistatic layer is preferably formed by drying a coating layer formed by coating a coating liquid on the surface of the second base film. From the viewpoint of reducing variations in in-plane retardation of the surface protective film, the drying temperature is preferably 60° C. or lower as described above.
  • the thickness of the second antistatic layer can be 10 nm or more and 1000 nm or less. It may be 100 nm or more. If the thickness of the second antistatic layer is less than 10 nm, the adhesion, antistatic properties, and strength may not be sufficient. There is also the possibility of doing so.
  • the in-plane retardation value at a wavelength of 550 nm was measured by the following procedure using a retardation measuring device (KOBRA-WPR manufactured by Oji Scientific Instruments Co., Ltd.).
  • Table 1 shows the results.
  • Example 1 (Preparation of release film (1)) A polyethylene terephthalate (PET) film (manufactured by Lintec Corporation: trade name “PLR-382190”) having a release treatment layer formed on one side thereof was prepared. A coating solution containing an antistatic agent (manufactured by Colcoat Co., Ltd.: trade name “Colcoat WAS-15SF”) was applied to the surface of the PET film opposite to the release treatment layer side, and the coating was applied at a temperature of 23°C for 10 minutes. A release film (1) was obtained by drying for minutes to form a first antistatic layer. The layer structure of the release film (1) was release layer/PET film (first base film)/first antistatic layer.
  • PTR-382190 polyethylene terephthalate
  • a coating solution containing an antistatic agent manufactured by Colcoat Co., Ltd.: trade name “Colcoat WAS-15SF”
  • (Formation of first adhesive layer) 81.8 parts of ethyl acetate, 96 parts of butyl acrylate, 3 parts of 2-hydroxyethyl acrylate, and 1 part of acrylic acid were added as solvents to a reaction vessel equipped with a condenser, a nitrogen inlet, a thermometer, and a stirrer. The mixed solution was charged, and the internal temperature was raised to 55° C. while replacing the air in the reaction vessel with nitrogen gas to make it oxygen-free. Thereafter, a solution obtained by dissolving 0.14 parts of azobisisobutyronitrile (polymerization initiator) in 10 parts of ethyl acetate was added to the whole amount.
  • azobisisobutyronitrile polymerization initiator
  • This temperature was maintained for 1 hour after the addition of the polymerization initiator, and then ethyl acetate was continuously added into the reaction vessel at an addition rate of 17.3 parts/hr while maintaining the internal temperature at 54 to 56°C to obtain a concentration of the acrylic resin.
  • concentration reached 35%
  • the addition of ethyl acetate was stopped, and the mixture was maintained at this temperature until 12 hours had passed since the addition of ethyl acetate.
  • ethyl acetate was added to adjust the concentration of the acrylic resin to 20% to prepare an ethyl acetate solution of the acrylic resin.
  • the obtained acrylic resin had a polystyrene-equivalent weight average molecular weight Mw of 1,470,000 and an Mw/Mn of 5.5 by GPC.
  • Weight-average molecular weight and number-average molecular weight were measured by adding 4 columns of "TSK gel XL (manufactured by Tosoh Corporation)" and 1 column of "Shodex GPC KF-802 (manufactured by Showa Denko K.K.)" to the GPC apparatus.
  • a total of 5 tubes are connected in series, and tetrahydrofuran is used as the eluent, the sample concentration is 5 mg/mL, the sample introduction amount is 100 ⁇ L, the temperature is 40° C., and the flow rate is 1 mL/min. bottom.
  • a cross-linking agent manufactured by Tosoh Corporation: trade name "Coronate L", an ethyl acetate solution of an isocyanate compound, 0.3 parts of active ingredient 75%) and 0.5 parts of a silane compound (manufactured by Shin-Etsu Chemical Co., Ltd.: product name "KBM403") were mixed, and ethyl acetate was added so that the solid content concentration was 14%. to obtain an adhesive composition.
  • the compounding amount of the said crosslinking agent is the number of mass parts as an active ingredient.
  • the pressure-sensitive adhesive composition obtained above was applied to the surface of the release film (1) on the release layer side using an applicator so that the thickness after drying was 25 ⁇ m, and dried at a temperature of 50° C. for 60 minutes.
  • a release film (1) with a pressure-sensitive adhesive layer was obtained in which the first pressure-sensitive adhesive layer was formed on the release treatment layer side of the release film (1).
  • polarizing plate Preparation of polarizing plate
  • a 20 ⁇ m-thick triacetyl cellulose (TAC) film and a 29 ⁇ m-thick norbornene-based resin film having a hard coat layer formed on one side thereof were prepared.
  • TAC triacetyl cellulose
  • a linear polarizing layer a PVA-based resin film in which iodine, which is a dichroic dye, was adsorbed and oriented was prepared. The thickness of the linear polarizing layer was 8 ⁇ m.
  • the TAC film prepared above was saponified.
  • the side of the norbornene-based resin film prepared above opposite to the hard coat layer side and both surfaces of the linearly polarizing layer prepared above were subjected to corona treatment.
  • a saponified TAC film is laminated via the water-based adhesive obtained above, and on the other surface of the linear polarizing layer, via the water-based adhesive obtained above.
  • the corona-treated surface (the side opposite to the hard coat layer side) of the norbornene-based resin film was adhered, followed by drying treatment to form an adhesive layer, thereby obtaining a polarizing plate.
  • the layer structure of the polarizing plate was TAC film (protective layer)/adhesive layer/linear polarizing layer/adhesive layer/norbornene-based resin film (protective layer)/hard coat layer.
  • a surface protective film in which an acrylic pressure-sensitive adhesive layer (thickness 15 ⁇ m) is formed on the side opposite to the second antistatic layer side of a polyester resin film (second base film, thickness 38 ⁇ m) having a second antistatic layer on the surface (thickness 53 ⁇ m) was prepared.
  • the layer structure of the surface protective film was second antistatic layer/second base film/acrylic pressure-sensitive adhesive layer (second pressure-sensitive adhesive layer).
  • the acrylic pressure-sensitive adhesive layer of this surface protective film was adhered to the hard coat layer side of the norbornene resin film of the polarizing plate obtained above to obtain a polarizing plate with a surface protective film.
  • the layer structure of the optical laminate (1) is: surface protective film (second antistatic layer/second base film/second adhesive layer)/polarizing plate (hard coat layer/protective layer/adhesive layer/linearly polarized light layer/adhesive layer/protective layer)/first pressure-sensitive adhesive layer/release film (releasing layer/first base film/first antistatic layer).
  • the slow axis of the surface protective film and the absorption axis of the linear polarizing layer were orthogonal, and the slow axis of the release film and the absorption axis of the linear polarizing layer were orthogonal.
  • the optical layered body (1) the following evaluation of inspection property and evaluation of multiple picking were performed. Table 1 shows the results.
  • Release films (2) to (4) were prepared in the same manner as the release film (1) of Example 1, except that the coating amount of the coating liquid containing the antistatic agent was changed to form the first antistatic layer. ).
  • the optical laminate (2) was prepared in the same manner as the optical laminate (1) of Example 1, except that the release films (2) to (4) obtained above were used instead of the release film (1). ) to (4) were obtained.
  • the following evaluation of inspection property and evaluation of multiple picking were performed. Table 1 shows the results.
  • a polyethylene terephthalate (PET) film (manufactured by Lintec Co., Ltd.: trade name “PLR-382190”) having one side subjected to mold release treatment was prepared.
  • a coating solution containing an antistatic agent (manufactured by Takamatsu Yushi Co., Ltd.: product name “ASA-2050”) was applied to the surface opposite to the release-treated surface of the PET film, and the temperature was 130°C. and dried by heating for 10 minutes to form a first antistatic layer to obtain a release film (5).
  • An optical laminate (5) was obtained in the same manner as the optical laminate (1) of Example 1, except that the release film (5) obtained above was used instead of the release film (1). .
  • the following inspection evaluation and multiple picking evaluation were performed. Table 1 shows the results.
  • a laminate in which a surface protective film having an antistatic layer, a polarizing plate, an adhesive layer, and a release film were laminated in this order was prepared as a laminate (40 mm ⁇ 40 mm) for evaluation.
  • the antistatic layer is formed on the opposite side of the surface protection film to the polarizing plate.
  • a laminate for evaluation is placed on a rubber base so that the release film side faces the base, and the surface protection film and the examples and comparisons are placed on the surface protection film side of the laminate for evaluation.
  • the optical layered body was laminated so that the release film side of the optical layered body obtained in the example faced each other.
  • the layered body for evaluation and the optical layered body were rubbed back and forth three times.
  • the load was applied using a rubber-made part in contact with the optical layered body.
  • the surfaces of the laminate for evaluation and the optical laminate are tilted so that they are perpendicular to the horizontal plane, and the optical laminate falls off. I checked the presence or absence of This test was performed 3 times, and multiple picking was evaluated according to the following criteria. a: The optical layered body fell off in all three tests. b: The optical layered body fell off twice in 3 tests. c: The optical layered body fell off once in 3 tests. d: The optical laminate did not come off even once in the three tests.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Chemical & Material Sciences (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Polarising Elements (AREA)
  • Laminated Bodies (AREA)

Abstract

Le problème décrit par la présente invention est de fournir un stratifié optique dans lequel un film pelable ayant une couche antistatique est empilé sur une plaque de polarisation et qui a une excellente aptitude à l'inspection. La solution selon l'invention porte sur un stratifié optique qui est configuré par empilement d'une plaque de polarisation comprenant une couche de polarisation linéaire, une première couche adhésive et un film pelable qui est pelable à partir de la première couche adhésive dans cet ordre. Le film pelable a une couche de traitement de libération, un premier film de matériau de base et une première couche antistatique contenant un agent antistatique dans l'ordre à partir du premier côté de couche adhésive. La valeur moyenne de retard dans le plan à une longueur d'onde de 550 nm du film pelable est de 1000 nm ou plus. La différence entre la valeur maximale et la valeur minimale de la valeur de retard dans le plan à une longueur d'onde de 550 nm du film pelable est inférieure ou égale à 150 nm. [Dessin sélectionné] FIG. 1
PCT/JP2022/031909 2021-08-27 2022-08-24 Stratifié optique WO2023027119A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000044841A1 (fr) * 1999-01-27 2000-08-03 Toyo Boseki Kabushiki Kaisha Film de protection de surface
JP2010113367A (ja) * 2009-12-28 2010-05-20 Toyobo Co Ltd 光学用部材およびこれに用いる表面保護フィルム
JP2014168857A (ja) * 2013-03-01 2014-09-18 Nitto Denko Corp 積層体
JP2015169848A (ja) * 2014-03-07 2015-09-28 富士フイルム株式会社 反射防止フィルム、偏光板、画像表示装置、及び反射防止フィルムの製造方法
JP2016006508A (ja) * 2010-09-21 2016-01-14 大日本印刷株式会社 帯電防止性ハードコートフィルム、その製造方法、偏光板及び画像表示装置
WO2018181070A1 (fr) * 2017-03-30 2018-10-04 日本ゼオン株式会社 Film antistatique, plaque de polarisation, panneau tactile et dispositif d'affichage à cristaux liquides
JP2020160421A (ja) * 2019-03-22 2020-10-01 住友化学株式会社 検査方法及び検査装置
WO2020241589A1 (fr) * 2019-05-31 2020-12-03 東洋紡株式会社 Film de matériau de base pour film de protection de surface d'un dispositif d'affichage d'image équipé d'un capteur d'authentification d'empreinte digitale, film de protection de surface et dispositif d'affichage d'image

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP7253391B2 (ja) 2019-01-21 2023-04-06 日東電工株式会社 補強用積層フィルム

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2000044841A1 (fr) * 1999-01-27 2000-08-03 Toyo Boseki Kabushiki Kaisha Film de protection de surface
JP2010113367A (ja) * 2009-12-28 2010-05-20 Toyobo Co Ltd 光学用部材およびこれに用いる表面保護フィルム
JP2016006508A (ja) * 2010-09-21 2016-01-14 大日本印刷株式会社 帯電防止性ハードコートフィルム、その製造方法、偏光板及び画像表示装置
JP2014168857A (ja) * 2013-03-01 2014-09-18 Nitto Denko Corp 積層体
JP2015169848A (ja) * 2014-03-07 2015-09-28 富士フイルム株式会社 反射防止フィルム、偏光板、画像表示装置、及び反射防止フィルムの製造方法
WO2018181070A1 (fr) * 2017-03-30 2018-10-04 日本ゼオン株式会社 Film antistatique, plaque de polarisation, panneau tactile et dispositif d'affichage à cristaux liquides
JP2020160421A (ja) * 2019-03-22 2020-10-01 住友化学株式会社 検査方法及び検査装置
WO2020241589A1 (fr) * 2019-05-31 2020-12-03 東洋紡株式会社 Film de matériau de base pour film de protection de surface d'un dispositif d'affichage d'image équipé d'un capteur d'authentification d'empreinte digitale, film de protection de surface et dispositif d'affichage d'image

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