WO2021193723A1 - 層間シート、剥離ライナー付き層間シートおよび光学積層体 - Google Patents

層間シート、剥離ライナー付き層間シートおよび光学積層体 Download PDF

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WO2021193723A1
WO2021193723A1 PCT/JP2021/012260 JP2021012260W WO2021193723A1 WO 2021193723 A1 WO2021193723 A1 WO 2021193723A1 JP 2021012260 W JP2021012260 W JP 2021012260W WO 2021193723 A1 WO2021193723 A1 WO 2021193723A1
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WIPO (PCT)
Prior art keywords
monomer
weight
less
sensitive adhesive
pressure
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PCT/JP2021/012260
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English (en)
French (fr)
Japanese (ja)
Inventor
普史 形見
賢一 片岡
智哉 西野
祐輔 山本
慎太郎 野依
Original Assignee
日東電工株式会社
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Priority claimed from JP2021049063A external-priority patent/JP2022008017A/ja
Application filed by 日東電工株式会社 filed Critical 日東電工株式会社
Priority to KR1020227036305A priority Critical patent/KR20220156055A/ko
Priority to CN202180024127.5A priority patent/CN115362233A/zh
Publication of WO2021193723A1 publication Critical patent/WO2021193723A1/ja

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    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/30—Adhesives in the form of films or foils characterised by the adhesive composition
    • C09J7/38—Pressure-sensitive adhesives [PSA]
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • 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
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • 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
    • B32B7/022—Mechanical 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
    • B32B7/02—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
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
    • C09J11/02—Non-macromolecular additives
    • C09J11/06—Non-macromolecular additives organic
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J133/00—Adhesives based on homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Adhesives based on derivatives of such polymers
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J201/00—Adhesives based on unspecified macromolecular compounds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/10—Adhesives in the form of films or foils without carriers
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B5/00—Optical elements other than lenses
    • G02B5/30—Polarising 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
    • B32B2367/00—Polyesters, e.g. PET, i.e. polyethylene terephthalate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2301/00—Additional features of adhesives in the form of films or foils
    • C09J2301/30—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier
    • C09J2301/312—Additional features of adhesives in the form of films or foils characterized by the chemical, physicochemical or physical properties of the adhesive or the carrier parameters being the characterizing feature

Definitions

  • the present invention has been created in view of the above circumstances, and provides an interlayer sheet that exhibits flexibility suitable for adhering to and following adjacent members, and has a high refractive index and high transparency.
  • Another object of the present invention for the purpose of the present invention is to provide an interlayer sheet with a release liner containing the above-mentioned interlayer sheet.
  • Another related object is to provide an optical laminate that includes the interlayer sheet as a component.
  • Interlayer sheet further comprises a viscoelastic layer V 2 which is laminated on the viscoelastic layer V 1.
  • the storage elastic modulus at 25 ° C. of the viscoelastic layer V 2 G 'V2 (hereinafter, "storage modulus G' may be referred to as V2 (25)".) Is the viscoelastic layer V 1 lower than the storage modulus G 'V1 at 25 ° C..
  • Such configuration interlayer sheet is due to the contribution of the viscoelastic layer V 2, it can be excellent in more flexible.
  • the refractive index n 2 of the viscoelastic layer V 2 is lower than the refractive index n 1 of the viscoelastic layer V 1. According to the interlayer sheet having such a configuration, by utilizing the refractive index difference of the viscoelastic layer V 1, V 2, it is possible to control the behavior of light transmitted through the interlayer sheet.
  • an interlayer sheet with a release liner including any of the interlayer sheets disclosed herein and a release liner covering at least one surface of the interlayer sheet.
  • the interlayer sheet disclosed herein is manufactured, stored, distributed, processed, etc. in the form of an interlayer sheet with a release liner whose at least one surface is protected by a release liner in this way, and before being laminated with an adjacent member. It can be preferably used in the mode of peeling off the release liner.
  • an optical laminate including any of the interlayer sheets disclosed herein and a resin film laminated on the interlayer sheet is provided.
  • the advantages of the interlayer sheet disclosed herein having high refractive index, high transparency and flexibility can be preferably exhibited.
  • Interlayer sheet disclosed herein, one or both surfaces an adhesive layer (for example, pressure-sensitive adhesive layer having a single layer structure made of viscoelastic layer V 1 of the non-releasable substrate (support substrate), or viscoelastic It may be in the form of an adhesive sheet with a base material having a laminated structure (adhesive layer having a laminated structure in which two or more adhesive layers including a layer V 1 and a viscoelastic layer V 2 are directly in contact with each other).
  • an adhesive layer for example, pressure-sensitive adhesive layer having a single layer structure made of viscoelastic layer V 1 of the non-releasable substrate (support substrate), or viscoelastic It may be in the form of an adhesive sheet with a base material having a laminated structure (adhesive layer having a laminated structure in which two or more adhesive layers including a layer V 1 and a viscoelastic layer V 2 are directly in contact with each other).
  • Adhesive layer 10 may be a single layer structure made of viscoelastic layer V 1 as shown in FIG. 1, 2 or more sub-sensitive adhesive layer having a different composition (e.g., viscoelastic layer constituting the adhesive surface 10A A laminated structure in which V 1 and two sub-adhesive layers of a viscoelastic layer V 2 arranged on the support base material 20 side are directly in contact with each other (that is, without being separated by a layer of a non-adhesive material). It may be.
  • the interlayer sheet disclosed herein may be in the form of a base material-less double-sided pressure-sensitive adhesive sheet composed of a pressure-sensitive adhesive layer.
  • the base material-less double-sided adhesive sheet 2 has a first surface (first adhesive surface) 10A and a second surface (second adhesive surface) 10B of the adhesive layer 10 before use.
  • At least the adhesive layer side may be a form protected by a release liner 31 or 32 having a releaseable surface (release surface).
  • the back surface of the release liner 31 (the surface opposite to the adhesive side) is the release surface, and the adhesive surface is wound or laminated so that the adhesive surface 10B abuts on the back surface of the release liner 31.
  • 10A and 10B may be in a protected form.
  • the refractive index of the pressure-sensitive adhesive can be measured by the method described in Examples described later.
  • the refractive index of the pressure-sensitive adhesive can be adjusted, for example, by the composition of the pressure-sensitive adhesive (for example, the composition of the monomer components constituting the base polymer, additives that can be used if necessary, etc.).
  • the difference between the refractive index n 1 of the first adhesive surface of the interlayer sheet and the refractive index n 2 of the second adhesive surface, that is, n 1- n 2, is, for example, greater than 0.00. It may be 0.01 or more, preferably 0.02 or more, 0.03 or more, 0.05 or more, 0.10 or more, 0.15 or more, and 0. It may be 20 or more, or 0.25 or more. The magnitude relationship between n 1 and n 2 may be reversed. The upper limit of n 1 to n 2 is not particularly limited.
  • the lower limit of the storage elastic modulus G'V1 (50) is not particularly limited.
  • the storage modulus G 'V1 (50) may be for example 10kPa or more may be at least 15 kPa, may be more than 20 kPa, more 23kPa It may be.
  • the viscoelastic layer (adhesive layer) V 1 has the following conditions: (A) storage modulus G 'V1 (25) is 350kPa or less (preferably less than 200 kPa, for example 180kPa or less); and (b) a storage modulus G' V1 (50) is less than 60 kPa (preferably less than 50 kPa, More preferably less than 40 kPa, eg less than 38 kPa); It is preferable to satisfy at least one of the above.
  • the storage elastic moduli G'V1 (25) and G'V1 (50) can be obtained by dynamic viscoelasticity measurement, and G'V1 (50) / G'V1 (25) can be calculated from the results.
  • the dynamic viscoelasticity measurement can be performed by a conventional method using a commercially available dynamic viscoelasticity measuring device, and can be performed under the following measurement conditions using, for example, ARES manufactured by TA Instruments or an equivalent product thereof. can.
  • As the sample for measurement a sample prepared to have a thickness of about 1.5 mm by laminating the pressure-sensitive adhesive layer to be evaluated as necessary is used. [Measurement condition] Deformation mode: Torsion measurement frequency: 1Hz Temperature rise rate: 5 ° C / min Shape: Parallel plate 7.9 mm ⁇
  • Interlayer sheet disclosed herein comprises a PSA layer V 1 having a high refractive index of above and, and haze value of the interlayer sheet is 1.0% or less.
  • a highly transparent interlayer sheet can be used for applications requiring high light transmission (for example, optical applications) in a configuration having or not having a base material, and an adherend can be satisfactorily visually recognized through the interlayer sheet. It can be preferably applied to applications where performance is required.
  • the haze value of the interlayer sheet may be 0.9% or less, 0.8% or less, 0.5% or less, or 0.3% or less.
  • the lower limit of the haze value of the interlayer sheet is not particularly limited, and a smaller haze value is preferable from the viewpoint of improving transparency.
  • the haze value of the interlayer sheet may be, for example, 0.05% or more, or 0.1% or more, in consideration of the refractive index and the adhesive property. It may be 0.2% or more, 0.3% or more, or 0.4% or more.
  • These haze values for the interlayer sheet are also the haze values of the pressure-sensitive adhesive sheet when the technique disclosed herein is carried out in the form of a base material-less pressure-sensitive adhesive sheet (typically, a pressure-sensitive adhesive sheet composed of an adhesive layer). It may be preferably applied.
  • the interlayer sheet disclosed herein is in the form of a double-sided pressure-sensitive adhesive sheet with a base material having a first pressure-sensitive adhesive layer and a second pressure-sensitive adhesive layer, at least the first pressure-sensitive adhesive layer (preferably the pressure-sensitive adhesive layer V 1 ). It is preferable that the water absorption rate of the above is limited to a predetermined value or less. From the viewpoint of obtaining a higher effect, it is more preferable that the water absorption rates of the first and second pressure-sensitive adhesive layers are all limited to a predetermined value or less.
  • the gel fraction of the viscoelastic layer V 1 was, it is appropriately set depending on the intended use and mode of use, etc., but is not limited to a specific range.
  • the gel fraction is, for example, about 99% or less, and about 97% or less is appropriate. From the viewpoint of facilitating a good balance between high refractive index and adhesive properties, in some preferred embodiments, the gel fraction is about 95% or less, more preferably about 92% or less (for example, about 90% or less). Can be.
  • the fact that the gel fraction is not too high appropriately follows the unevenness that may exist on the surface of the adherend (for example, the uneven structure provided for the purpose of improving the light extraction efficiency in the light emitting device), and satisfactorily follows.
  • the gel fraction may be approximately 88% or less, approximately 75% or less, or approximately 65% or less. Further, the gel fraction is, for example, about 10% or more, and about 20% or more, from the viewpoint of imparting appropriate cohesiveness to the pressure-sensitive adhesive and appropriately expressing the adhesive characteristics, and is about 20% or more. It may be 30% or more. From the viewpoint of deformation resistance of the viscoelastic layer V 1 (prevention of air bubbles due to pressure squeeze out and foreign matter biting, etc.), the gel fraction is preferably about 30% or more, more preferably about 40% or more. , About 45% or more, about 50% or more, about 65% or more, or about 75% or more.
  • tan ⁇ tangent loss
  • the pressure-sensitive adhesive tan ⁇ has a measurement temperature range of -60 ° C while sandwiching a disk-shaped pressure-sensitive adhesive sample with a thickness of about 2 mm and a diameter of 7.9 mm between parallel plates and applying shear strain at a frequency of 1 Hz using a viscoelasticity tester.
  • Tpeak peak temperature of tan ⁇ of the pressure-sensitive adhesive
  • Tpeak of the viscoelastic layer V 1 was, is advantageously at 45 ° C. or less, or 35 ° C. or less, preferably from 30 ° C. or less (e.g., 25 ° C. or less) may be at 20 ° C. or less , 15 ° C. or lower. Adhesives with a lower Tpeak tend to provide good initial adhesiveness and adhesion in the room temperature range. On the other hand, it is preferable that the Tpeak of the pressure-sensitive adhesive is not too low from the viewpoint of imparting appropriate cohesiveness to the pressure-sensitive adhesive, and it tends to be suitable for both high refractive index and high refractive index.
  • the Tpeak of the pressure-sensitive adhesive may be, for example, ⁇ 40 ° C. or higher, ⁇ 30 ° C. or higher, ⁇ 20 ° C. or higher, ⁇ 5 ° C. or higher, 5 ° C. or higher. However, it may be 15 ° C. or higher, and further may be 25 ° C. or higher.
  • a pressure-sensitive adhesive having a relatively high Tpeak can be preferably used in an embodiment in which one or both of the pressure-sensitive adhesive and the adherend are heated to a temperature slightly higher than room temperature, if necessary, when the pressure-sensitive adhesive is attached to the adherend.
  • the viscoelastic layer V 1) it is preferable to apply the viscoelastic layer V 1), more preferably it is applied to both the pressure-sensitive adhesive layer constituting the pressure-sensitive adhesive layer and the second adhesive surface constituting the first adhesive surface.
  • the Tpeak of the pressure-sensitive adhesive layer forming the first adhesive surface and the Tpeak of the pressure-sensitive adhesive layer forming the second adhesive surface may be the same or different.
  • the type of the pressure-sensitive adhesive constituting the pressure-sensitive adhesive layer V 1 is not particularly limited.
  • the pressure-sensitive adhesive may be an acrylic polymer, a rubber-based polymer (for example, natural rubber, synthetic rubber, a mixture thereof, etc.), a polyester-based polymer, a urethane-based polymer, a polyether polymer, or a silicone-based polymer that can be used in the field of pressure-sensitive adhesives.
  • One or more of various rubber-like polymers such as polyamide polymers and fluoropolymers are included as adhesive polymers (hereinafter, also referred to as "base polymers" in the sense of structural polymers forming adhesives).
  • an interlayer sheet in which the pressure-sensitive adhesive layer V 1 is composed of an acrylic pressure-sensitive adhesive that is, an interlayer sheet having an acrylic pressure-sensitive adhesive layer will be mainly described, but the pressure-sensitive adhesive layer V 1 in the interlayer sheet disclosed herein will be mainly described. Is not intended to be limited to the acrylic pressure-sensitive adhesive layer.
  • acrylic means acrylic and methacrylic, respectively. Therefore, the concept of the acrylic monomer here may include both a monomer having an acryloyl group (acrylic monomer) and a monomer having a methacryloyl group (methacryl monomer).
  • a pressure-sensitive adhesive composition containing substantially all of the monomer components for example, 95% by weight or more, preferably 99% by weight or more
  • a pressure-sensitive adhesive composition containing substantially all of the monomer components in the form of a polymer is preferable from the viewpoint of easily forming an interlayer sheet with less distortion and warpage.
  • a compound containing at least one aromatic ring and at least one ethylenically unsaturated group in one molecule is used.
  • the monomer (m1) one of the compounds may be used alone or in combination of two or more.
  • the aromatic ring of the compound used as the monomer (m1) is, for example, a benzene ring (which may be a benzene ring forming a part of a biphenyl structure or a fluorene structure); a naphthalene ring, an inden ring, an azulene ring, an anthracene ring, and a phenanthrene.
  • the number of carbon atoms contained in the substituent is preferably 1 to 4, more preferably 1 to 3, and may be, for example, 1 or 2.
  • the aromatic ring has one or more substituents that do not have a substituent on the ring-constituting atom or are selected from the group consisting of an alkyl group, an alkoxy group and a halogen atom (eg, a bromine atom). It can be an aromatic ring having.
  • the fact that the aromatic ring of the monomer (m1) has a substituent on its ring-constituting atom means that the aromatic ring has a substituent other than the substituent having an ethylenically unsaturated group.
  • the aromatic ring and the ethylenically unsaturated group may be directly bonded or may be bonded via a linking group.
  • the linking group is, for example, an alkylene group, an oxyalkylene group, a poly (oxyalkylene) group, a phenyl group, an alkylphenyl group, an alkoxyphenyl group, and a structure in which one or more hydrogen atoms are substituted with hydroxyl groups in these groups. It can be a group containing one or more structures selected from the group (eg, hydroxyalkylene group), oxy group (—O— group), thiooxy group (—S— group), and the like.
  • the aromatic ring and the ethylenically unsaturated group are directly bonded or bonded via a linking group selected from the group consisting of alkylene groups, oxyalkylene groups and poly (oxyalkylene) groups.
  • An aromatic ring-containing monomer having a structure having a structure can be preferably adopted.
  • the number of carbon atoms in the alkylene group and the oxyalkylene group is preferably 1 to 4, more preferably 1 to 3, and may be, for example, 1 or 2.
  • the number of repetitions of the oxyalkylene unit in the poly (oxyalkylene) group can be, for example, 2 to 3.
  • the content of the monomer (m1) in the monomer component constituting the acrylic polymer (A) is not particularly limited, and the desired refractive index and adhesive properties (for example, peel strength, flexibility, etc.) and / or optical properties (for example, all) are not particularly limited. It can be set so as to realize a pressure-sensitive adhesive layer that has both light transmittance, haze value, etc.).
  • the content of the monomer (m1) in the monomer component may be, for example, 30% by weight or more, preferably 50% by weight or more, 60% by weight or more, or 70% by weight or more. good.
  • the content of the monomer (m1) may be 93% by weight or less, 90% by weight or less, 80% by weight or less, or 75% by weight or less. In some embodiments where more adhesive and / or optical properties are emphasized, the content of the monomer (m1) in the monomer component may be 70% by weight or less, 60% by weight or less, or 45% by weight or less. good.
  • a monomer having a structure in which two or more non-condensed aromatic rings are chemically bonded directly that is, without interposing other atoms
  • a monomer having a condensed aromatic ring structure a monomer having a fluorene structure, and a monomer having a dinaphthothiophene structure.
  • the monomer containing a plurality of aromatic rings may be used alone or in combination of two or more.
  • Examples of the monomer having a dibenzothiophene structure include (meth) acryloyl group-containing dibenzothiophene, vinyl group-containing dibenzothiophene, and the like.
  • a monomer having a dibenzothiophene structure is included in the concept of a monomer having a condensed aromatic ring structure because it has a structure in which a thiophene ring and two benzene rings are condensed. Neither the dinaphthothiophene structure nor the dibenzothiophene structure corresponds to a structure in which two or more uncondensed aromatic rings are directly chemically bonded.
  • the technique disclosed herein can also be carried out in an embodiment in which the content of the monomer containing a plurality of aromatic rings in the monomer (m1) is less than 5% by weight. It is not necessary to use a monomer containing a plurality of aromatic rings.
  • the content of the aromatic ring plurality-containing monomer in the above-mentioned monomer component may be 70% by weight or less, 50% by weight or less, and 25% by weight or less in consideration of adhesive properties and / or optical properties. However, it may be 15% by weight or less, or 5% by weight or less.
  • the technique disclosed herein can also be carried out in an embodiment in which the content of the monomer containing a plurality of aromatic rings in the above-mentioned monomer component is less than 3% by weight.
  • the high refractive index monomer may be used alone or in combination of two or more.
  • the refractive index of the monomer is measured using an Abbe refractive index meter under the conditions of a measurement wavelength of 589 nm and a measurement temperature of 25 ° C.
  • As the Abbe refractive index meter a model "DR-M4" manufactured by ATAGO or an equivalent product thereof can be used. If the manufacturer or the like provides a nominal value of the refractive index at 25 ° C., the nominal value can be adopted.
  • the content of the high refractive index monomer in the monomer component constituting the acrylic polymer is not particularly limited, and the desired refractive index and adhesive properties (for example, peel strength, flexibility, etc.) and / or optical properties (for example, total light transmittance) are not particularly limited. , Haze value, etc.) can be set so as to realize a pressure-sensitive adhesive layer.
  • the content of the high refractive index monomer in the monomer component may be, for example, 3% by weight or more, 10% by weight or more, or 25% by weight or more.
  • the content of the high refractive index monomer in the above-mentioned monomer component may be, for example, more than 35% by weight, and more than 50% by weight. It may be more than 70% by weight, 75% by weight or more, 85% by weight or more, 90% by weight or more, or 95% by weight or more.
  • the content of the high refractive index monomer in the above-mentioned monomer component can be 100% by weight, but it is advantageous to make it less than 100% by weight from the viewpoint of achieving a good balance between the high refractive index and the adhesive property and / or the optical property.
  • the Tg of the monomer L may be, for example, ⁇ 70 ° C. or higher, ⁇ 55 ° C. or higher, or ⁇ 45 ° C. or higher.
  • the monomer L one type can be used alone or two or more types can be used in combination.
  • the content of the monomer L in the monomer (m1) may be less than 100% by weight from the viewpoint of achieving both flexibility suitable as a pressure-sensitive adhesive and high refractive index in a well-balanced manner. , 98% by weight or less, 90% by weight or less, 80% by weight or less, 70% by weight or less, 50% by weight or less, 25% by weight or less, or 10% by weight or less.
  • the technique disclosed herein can also be carried out in an embodiment in which the content of the monomer L in the monomer (m1) is less than 5% by weight. It is not necessary to use the monomer L.
  • the glass transition temperature Tg m1 based on the composition of the monomer (m1) is a Tg obtained by the Fox formula described later based on the composition of only the monomer (m1) among the monomer components constituting the acrylic polymer.
  • the glass transition temperature Tg m1 is a homopolymer of each aromatic ring-containing monomer used as the monomer (m1) by applying the Fox formula described later for only the monomer (m1) among the monomer components constituting the acrylic polymer. It can be calculated from the glass transition temperature and the weight fraction of each aromatic ring-containing monomer in the total amount of the monomers (m1).
  • the Tg of the homopolymer of the monomer and the glass transition temperature Tg m1 are the same.
  • the monomer L and the monomer H in combination, for example, in a configuration in which the content of the aromatic ring-containing monomer (m1) in the monomer component is relatively large, the high refractive index and flexibility of the pressure-sensitive adhesive are compatible at a higher level. Can be made to.
  • the usage amount ratio of the monomer L and the monomer H can be set so as to preferably exhibit such an effect, and is not particularly limited. For example, it is preferable to set the usage amount ratio of the monomer L and the monomer H so as to satisfy any of the above-mentioned glass transition temperatures Tg m1.
  • Limiting the amount of a compound containing a structure in which two or more non-condensed aromatic rings are directly chemically bonded in this way is a viewpoint of realizing a pressure-sensitive adhesive having a good balance of flexibility, tackiness and high refractive index. Can be advantageous from.
  • Examples of the ethylenically unsaturated group contained in the monomer (m2) include a (meth) acryloyl group, a vinyl group, a (meth) allyl group and the like.
  • a (meth) acryloyl group is preferable from the viewpoint of polymerization reactivity, and an acryloyl group is more preferable from the viewpoint of flexibility and adhesiveness.
  • a compound (that is, a monofunctional monomer) in which the number of ethylenically unsaturated groups contained in one molecule is 1 is preferably used as the monomer (m2).
  • the content of the monomer (m2) is, for example, 30% by weight or less or 25% by weight or less, and the content of the monomer (m1) is relatively increased to achieve high refraction. From the viewpoint of facilitating rate, it is preferably 20% by weight or less, more preferably 15% by weight or less, less than 12% by weight, less than 10% by weight, or less than 7% by weight. ..
  • the content of the carboxy group-containing monomer in the monomer component is not particularly limited, and is, for example, 0.01% by weight or more (preferably 0.1% by weight or more, more preferably 0.1% by weight or more). Can be 0.3% by weight or more).
  • the content of the carboxy group-containing monomer may be 1% by weight or more, 2% by weight or more, or 4% by weight or more.
  • the upper limit of the content of the carboxy group-containing monomer in the monomer component is set so that the total with the amount of other monomers used does not exceed 100% by weight, and it is appropriate to set it to, for example, 30% by weight or less or 25% by weight or less.
  • the total content of the monomer (m1) and the monomer (m2) in the monomer component constituting the acrylic polymer may be, for example, 31% by weight or more, preferably 51% by weight or more, or 61% by weight or more. , 71% by weight or more.
  • the total content of the monomer (m1) and the monomer (m2) in the monomer component constituting the acrylic polymer is, for example, 76% by weight from the viewpoint of facilitating the effect of these monomers. It may be more than 81% by weight, preferably 86% by weight or more, 91% by weight or more, 96% by weight or more, 99% by weight or more, substantially 100% by weight. But it may be.
  • the monomer component constituting the acrylic polymer may contain a monomer other than the above-mentioned monomer (m1) and the above-mentioned monomer (m2), if necessary.
  • An example of such an optional component is an alkyl (meth) acrylate (hereinafter, also referred to as “monomer (m3)”).
  • the monomer (m3) can be useful for adjusting the flexibility of the pressure-sensitive adhesive and improving the compatibility in the pressure-sensitive adhesive.
  • an alkyl (meth) acrylate having a linear or branched alkyl group having 1 to 20 carbon atoms (that is, C 1-20) at the ester terminal can be preferably used.
  • C 1-20 alkyl (meth) acrylate include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, isopropyl (meth) acrylate, and n- (meth) acrylate.
  • alkyl (meth) acrylates having a homopolymer Tg of ⁇ 20 ° C. or lower are preferably employed as at least a portion of the monomer (m3). Can be done.
  • Such low Tg alkyl (meth) acrylates can help improve the flexibility of the adhesive.
  • the lower limit of Tg of the alkyl (meth) acrylate is not particularly limited, and may be, for example, ⁇ 85 ° C. or higher, ⁇ 75 ° C. or higher, ⁇ 65 ° C. or higher, or ⁇ 60 ° C. or higher.
  • Specific examples of the low Tg alkyl (meth) acrylate include n-butyl acrylate (BA), 2-ethylhexyl acrylate (2EHA), and isononyl acrylate (iNA).
  • the content of the alkyl (meth) acrylate in the monomer component can be set so that the effect of use thereof is appropriately exhibited.
  • the content of the alkyl (meth) acrylate may be, for example, 1% by weight or more, 3% by weight or more, 5% by weight or more, or 8% by weight or more.
  • the content of the alkyl (meth) acrylate may be 15% by weight or more, 30% by weight or more, or 45% by weight or more.
  • the upper limit of the content of the monomer (m3) in the monomer component is set so that the total content with the content of other monomers does not exceed 100% by weight, and can be, for example, less than 50% by weight. In some embodiments, the content of the monomer (m3) can be, for example, less than 35% by weight.
  • the refractive index of alkyl (meth) acrylate is relatively low. Therefore, in order to increase the refractive index, the content of the monomer (m3) in the monomer component is limited, and the content of the monomer (m1) is relatively large. It is advantageous to do.
  • Examples of the above-mentioned other monomers include monomers having functional groups other than hydroxyl groups and carboxy groups (functional group-containing monomers).
  • other monomers that can improve the cohesive force and heat resistance of the pressure-sensitive adhesive include sulfonic acid group-containing monomers, phosphoric acid group-containing monomers, and cyano group-containing monomers.
  • an amide group-containing monomer for example, (meth).
  • amino group-containing monomer for example, aminoethyl (meth) acrylate, N, N-dimethylaminoethyl (meth) acrylate, etc.
  • monomer having a nitrogen atom-containing ring for example, , N-vinyl-2-pyrrolidone, N- (meth) acryloy
  • vinyl ester-based monomers such as vinyl acetate; non-aromatic ring-containing (meth) acrylates such as cyclohexyl (meth) acrylate and isobornyl (meth) acrylate; ethylene, Olefin-based monomers such as butadiene and isobutylene; Chlorine-containing monomers such as vinyl chloride; alkoxy group-containing monomers such as methoxyethyl (meth) acrylate, ethoxyethyl (meth) acrylate and ethoxyethoxyethyl (meth) acrylate; Vinyl ether such as methyl vinyl ether System monomers; and the like.
  • ethoxyethoxyethyl acrylate also known as ethyl carbitol acrylate, homopolymer Tg: ⁇ 67 ° C.
  • the amount used is not particularly limited, and can be appropriately set within a range in which the total amount of the monomer components does not exceed 100% by weight.
  • the content of the other monomer in the monomer component can be, for example, about 35% by weight or less, and is about 25, from the viewpoint of facilitating the effect of improving the refractive index by using the monomer (m1). It is appropriate to set it to about 20% by weight or less (for example, 0 to 25% by weight), and it may be about 20% by weight or less (for example, 0 to 20% by weight), about 10% by weight or less, or about 5% by weight or less. For example, it may be about 1% by weight or less.
  • the technique disclosed herein can be preferably carried out in a manner in which the monomer component is substantially free of the other monomers.
  • the monomer component constituting the acrylic polymer may have a composition in which the amount of the methacryloyl group-containing monomer used is suppressed to a predetermined value or less.
  • the amount of the methacryloyl group-containing monomer used in the monomer component may be, for example, less than 5% by weight, less than 3% by weight, less than 1% by weight, or less than 0.5% by weight. Limiting the amount of the methacryloyl group-containing monomer used in this way can be advantageous from the viewpoint of realizing a pressure-sensitive adhesive having both flexibility and adhesiveness and a high refractive index in a well-balanced manner.
  • the monomer component constituting the acrylic polymer may have a composition that does not contain a methacryloyl group-containing monomer (for example, a composition consisting of only an acryloyl group-containing monomer).
  • the monomer components constituting the base polymer of the viscoelastic layer V 1 e.g., acrylic polymers
  • the monomer components constituting the base polymer of the viscoelastic layer V 1 e.g., acrylic polymers
  • carboxy e.g., carboxy
  • the amount of the carboxy group-containing monomer used in the monomer component may be, for example, less than 1% by weight, preferably less than 0.5% by weight, more preferably less than 0.3% by weight, and 0.1. It may be less than% by weight or less than 0.05% by weight.
  • the monomer components constituting the base polymer of the viscoelastic layer V 1 was, has (other carboxyl group, a sulfonic acid group includes a phosphoric acid group.) Acidic functional groups It is preferable that the amount of the monomer used is limited. As the amount of the acidic functional group-containing monomer used in the monomer component of such an embodiment, the above-mentioned preferable amount of the carboxy group-containing monomer can be applied. Interlayer sheet disclosed herein may be preferably carried out in the manner described above monomer component does not contain an acidic group-containing monomer (i.e. aspect based polymer is an acid-free viscoelastic layer V 1).
  • the base polymer of the pressure-sensitive adhesive layer preferably has a glass transition temperature Tg T based on the composition of the monomer components constituting the polymer, which is approximately 20 ° C. or lower. , Approximately 10 ° C or lower, more preferably 0 ° C or lower, -10 ° C or lower, -20 ° C or lower, -25 ° C or lower, ⁇ 28 ° C or lower, ⁇ 28 ° C or lower, ⁇ It may be 30 ° C. or lower.
  • a low glass transition temperature Tg T can be advantageous from the viewpoint of improving the flexibility of the pressure-sensitive adhesive.
  • the glass transition temperature Tg T may be, for example, ⁇ 60 ° C. or higher, preferably ⁇ 50 ° C. or higher, and more preferably ⁇ 45 ° C. or higher, from the viewpoint of facilitating high refractive index of the pressure-sensitive adhesive. Yes, it may be above -40 ° C, above -35 ° C, above -25 ° C, above -15 ° C, or above -5 ° C. good.
  • the method for obtaining the base polymer of the pressure-sensitive adhesive layer is not particularly limited, and is a solution polymerization method or an emulsion polymerization method.
  • a known polymerization method such as a bulk polymerization method, a suspension polymerization method, and a photopolymerization method can be appropriately adopted.
  • the solution polymerization method may be preferably employed.
  • the polymerization temperature at the time of solution polymerization can be appropriately selected depending on the type of monomer and solvent used, the type of polymerization initiator, etc., and is, for example, about 20 ° C. to 170 ° C. (typically 40 ° C. to 140 ° C.). °C).
  • the desired refractive index can be achieved by using a smaller amount of the refractive index improver. This is preferable from the viewpoint of suppressing deterioration of adhesive properties and optical properties.
  • the upper limit of the refractive index of the refractive index improver is not particularly limited, but from the viewpoint of compatibility in the pressure-sensitive adhesive and the ease of compatibility between high refractive index and flexibility suitable as a pressure-sensitive adhesive, for example, 3.000 or less. It may be 2.500 or less, 2.000 or less, 1.950 or less, 1.900 or less, or 1.850 or less.
  • the molecular weight of the organic material used as an additive ( HRO ) is not particularly limited and can be selected according to the intended purpose.
  • the molecular weight of the additive (H RO ) can be selected, for example, from the range of 30,000 or less.
  • the additive ( HRO ) is preferably a polymer or non-polymer having a lower molecular weight than the base polymer.
  • the molecular weight of the additive (HRO ) is balanced from the viewpoint of achieving a good balance between the effect of increasing the refractive index and other properties (for example, flexibility suitable for an adhesive and optical properties such as haze).
  • the molecular weight of the additive (H RO) may be, for example, 130 or more, or 150 or more.
  • the compound having a fluorene structure examples include the above-mentioned monomer having a fluorene structure, an oligomer which is a homopolymer or a copolymer of such a monomer, and 9,9-bis (4-hydroxyphenyl) fluorene (Refraction rate: 1.68), 9,9-bis (4-aminophenyl) fluorene (refractive rate: 1.73), 9,9-bis (4-hydroxy-3-methylphenyl) fluorene (refractive rate: 1) .68), 9,9-bisphenylfluorene and its derivatives such as 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene (refractive index: 1.65) can be mentioned.
  • heterocyclic also called containing organic compound.
  • thioepoxy compound a compound having a triazine ring, and the like.
  • the thioepoxy compound include bis (2,3-epithiopropyl) disulfide described in Japanese Patent No. 3712653 and a polymer thereof (refractive index 1.74).
  • the compound having a triazine ring include a compound having at least one triazine ring (for example, 3 to 40, preferably 5 to 20) in one molecule.
  • the molecular weight of the plasticizing material is preferably 130 or more, preferably 150 or more, and may be 170 or more, from the viewpoint of facilitating the exertion of a sufficient plasticizing effect. , 200 or more, 250 or more, 300 or more. In some embodiments, the molecular weight of the thermoplastic material may be 500 or greater, 1000 or greater, or 2000 or greater. It is preferable that the molecular weight of the thermoplastic material is not too low from the viewpoint of the heat resistance performance of the interlayer sheet and the suppression of contamination of the adherend.
  • thermoplastic material an organic material having a refractive index of about 1.50 or more (more preferably 1.53 or more) can be preferably used.
  • specific examples of compounds that can be options for plasticizing materials include diethylene glycol dibenzoate (refraction: 1.55), dipropylene glycol dibenzoate (refraction: 1.54), 3-phenoxytoluene (refraction: 1.57), 3-Ethylbiphenyl (refraction 1.59), 3-methoxybiphenyl (refraction 1.61), 4-methoxybiphenyl (refraction 1.57), polyethylene glycol dibenzoate, 3-phenoxybenzyl alcohol (refraction 1) .59), triphenyl phosphate (refraction rate 1.56), benzyl benzoate (refraction rate 1.57), 4- (tert-butyl) phenyldiphenyl phosphate (refraction rate 1.56), trimethylphenyl phosphate (refraction rate 1.56) 1.55), butylbenzylphthalate (refraction: 1.55), di
  • Leveling agent In some embodiments, (which may be a viscoelastic layer V 1 and / or viscoelastic layer V 2.) Adhesive layer on the pressure-sensitive adhesive composition used for forming a pressure-sensitive adhesive layer formed from the composition
  • a leveling agent can be contained as necessary for the purpose of improving the appearance (for example, improving the uniformity of thickness) and improving the coatability of the pressure-sensitive adhesive composition.
  • the leveling agent include an acrylic leveling agent, a fluorine-based leveling agent, a silicone-based leveling agent, and the like.
  • an appropriate leveling agent can be selected from commercially available leveling agents and used by a conventional method.
  • the functional group equivalent of the monomer S1 is the sum of the products of the functional group equivalents of each type of monomer and the weight fraction of the monomer. be able to.
  • the content of the monomer S1 in the monomer raw material B can be an appropriate value within a range in which the desired effect is exhibited by using the monomer S1, and is not limited to a specific range. In some embodiments, the content of the monomer S1 in the monomer raw material B may be, for example, 5-60% by weight, 10-50% by weight, or 15-40% by weight.
  • the monomer raw material B may contain, for example, one or more selected from methyl methacrylate (MMA), n-butyl methacrylate (BMA) and 2-ethylhexyl methacrylate (2EHMA) as the acrylic monomer.
  • MMA methyl methacrylate
  • BMA n-butyl methacrylate
  • EHMA 2-ethylhexyl methacrylate
  • acrylic monomer is a (meth) acrylic acid ester having an alicyclic hydrocarbon group.
  • cyclopentyl (meth) acrylate, cyclohexyl (meth) acrylate, isobornyl (meth) acrylate, dicyclopentanyl (meth) acrylate, 1-adamantyl (meth) acrylate and the like can be used. It is not necessary to use a (meth) acrylic acid ester having an alicyclic hydrocarbon group.
  • the Mw of the polymer (B) may be, for example, 5,000 or more, preferably 10,000 or more, and may be 15,000 or more.
  • the Mw of the polymer (B) may be, for example, 200,000 or less, preferably 100,000 or less, 50,000 or less, or 30,000 or less.
  • the polymer (B) can be produced, for example, by polymerizing the above-mentioned monomer by a known method such as a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, a suspension polymerization method, or a photopolymerization method.
  • Chain transfer agents can be used as needed to adjust the molecular weight of the polymer (B). Examples of chain transfer agents used include compounds having a mercapto group such as t-dodecyl mercaptoethanol, mercaptoethanol, ⁇ -thioglycerol; thioglycolic acid esters such as thioglycolic acid and methyl thioglycolate; ⁇ -methylstyrene.
  • the amount of the chain transfer agent used is not particularly limited, and can be appropriately set so that the polymer (B) having a desired molecular weight can be obtained.
  • the amount of the chain transfer agent used per 100 parts by weight of the monomer may be, for example, 0.1 to 5 parts by weight, 0.2 to 3 parts by weight, or 0.5 to 2 parts by weight. good.
  • the amount of the polymer (B) used with respect to 100 parts by weight of the base polymer can be, for example, 0.001 part by weight or more, and 0.01 part by weight or more from the viewpoint of obtaining a higher use effect. It may be 0.03 part by weight or more.
  • the amount of the polymer (B) used may be, for example, 3 parts by weight or less, and it is appropriate to use 1 part by weight or less from the viewpoint of reducing the influence on the refractive index, and 0.5 parts by weight or less. However, it may be 0.1 parts by weight or less.
  • inorganic particles The technique disclosed herein can be preferably carried out in a manner in which inorganic particles as a refractive index improver are substantially not used. However, it is permissible to use inorganic particles as the refractive index improver as long as the application effect of the technique disclosed herein is not significantly impaired.
  • inorganic particles that can be used as a refractive index improver include titania (titanium oxide, TiO 2 ), zirconia ( zinc oxide, ZrO 2 ), aluminum oxide, zinc oxide, tin oxide, copper oxide, barium titanate, and oxidation.
  • examples thereof include inorganic particles composed of inorganic oxides (specifically, metal oxides) such as niobium (Nb 2 O 5 and the like).
  • the amount used is preferably less than 5 parts by weight and more preferably less than 1 part by weight with respect to 100 parts by weight of the base polymer.
  • the amount of the inorganic particles, by weight is preferably not more than 2 times the amount of the additive (H RO), 1 times or less or 0. More preferably, it is 5 times or less.
  • the PSA composition used to form the pressure-sensitive adhesive layer (which may be a viscoelastic layer V 1 and / or viscoelastic layer V 2.), Adjustment of the cohesive force of the pressure-sensitive adhesive
  • a cross-linking agent can be contained if necessary.
  • a cross-linking agent known in the field of adhesives such as an isocyanate-based cross-linking agent, an epoxy-based cross-linking agent, an aziridine-based cross-linking agent, an oxazoline-based cross-linking agent, a melamine-based resin, and a metal chelate-based cross-linking agent shall be used. Can be done.
  • an isocyanate-based cross-linking agent can be preferably used.
  • Another example of the cross-linking agent is a monomer having two or more ethylenically unsaturated groups in one molecule, that is, a polyfunctional monomer.
  • the cross-linking agent may be used alone or in combination of two or more.
  • a bifunctional or higher functional isocyanate compound can be used, for example, aliphatic polyisocyanates such as trimethylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate (HDI), and dimerate diisocyanate; cyclopentylene diisocyanate.
  • aliphatic polyisocyanates such as trimethylene diisocyanate, butylene diisocyanate, hexamethylene diisocyanate (HDI), and dimerate diisocyanate
  • HDI hexamethylene diisocyanate
  • dimerate diisocyanate dimerate diisocyanate
  • Aromatic isocyanates such as XDI); polyisocyanate modified products obtained by modifying the above isocyanate compounds with allophanate bonds, biuret bonds, isocyanurate bonds, uretdione bonds, urea bonds, carbodiimide bonds, uretonimine bonds, oxadiazine trione bonds, etc.
  • the isocyanate compound may be used alone or in combination of two or more.
  • a bifunctional isocyanate compound and a trifunctional or higher functional isocyanate compound may be used in combination.
  • epoxy-based cross-linking agent examples include bisphenol A, epichlorohydrin-type epoxy resin, ethylene glycidyl ether, polyethylene glycol diglycidyl ether, glycerin diglycidyl ether, glycerin triglycidyl ether, 1,6-hexanediol glycidyl ether, and trimethylol.
  • the amount used is not particularly limited, and is, for example, in the range of about 0.001 part by weight to 5.0 parts by weight with respect to 100 parts by weight of the base polymer. can do.
  • the amount of the cross-linking agent used with respect to 100 parts by weight of the base polymer is preferably 3.0 parts by weight or less, more preferably 2.0 parts by weight or less. It may be 1.0 part by weight or less, 0.5 part by weight or less, or 0.2 part by weight or less.
  • a cross-linking catalyst may be used to allow the cross-linking reaction to proceed more effectively.
  • the cross-linking catalyst include metal-based cross-linking catalysts such as tetra-n-butyl titanate, tetraisopropyl titanate, ferric nasem, butyl tin oxide, and dioctyl tin dilaurate. Of these, tin-based cross-linking catalysts such as dioctyl tin dilaurate are preferable.
  • the amount of the cross-linking catalyst used is not particularly limited.
  • the pressure-sensitive adhesive composition can contain a compound that causes keto-enol tautomerism as a cross-linking retarder. Thereby, the effect of extending the pot life of the pressure-sensitive adhesive composition can be realized.
  • a compound that causes keto-enol tautomerism can be preferably used in a pressure-sensitive adhesive composition containing an isocyanate-based cross-linking agent.
  • Various ⁇ -dicarbonyl compounds can be used as the compound that causes keto-enol telecommunication.
  • ⁇ -diketones acetylacetone, 2,4-hexanedione, etc.
  • acetoacetic esters methyl acetoacetate, ethyl acetoacetate, etc.
  • the compounds that cause keto-enol tautomerism can be used alone or in combination of two or more.
  • the amount of the compound that causes keto-enol telecommunication can be, for example, 0.1 parts by weight or more and 20 parts by weight or less, and 0.5 parts by weight or more and 10 parts by weight or less, based on 100 parts by weight of the base polymer. It may be 1 part by weight or more and 5 parts by weight or less.
  • PSA layer in the art disclosed herein, the may contain a tackifier.
  • the pressure-sensitive adhesive include rosin-based pressure-sensitive adhesive resin, terpen-based pressure-sensitive adhesive resin, phenol-based pressure-sensitive adhesive resin, hydrocarbon-based pressure-sensitive adhesive resin, ketone-based pressure-sensitive adhesive resin, polyamide-based pressure-sensitive adhesive resin, epoxy-based pressure-sensitive adhesive resin, and elastomer.
  • a known pressure-sensitive adhesive resin such as a system-based pressure-sensitive adhesive resin can be used. These can be used alone or in combination of two or more.
  • the peel strength of the interlayer sheet with respect to the glass plate is about 1.0 N / 25 mm or more (for example, 1.5 N / 25 mm or more). Is 2N / 25mm or more, more preferably 3N / 25mm or more, 4N / 25mm or more, 6N / 25mm or more, 8N / 25mm or more, 10N / 25mm or more, 12N / 25mm or more. ..
  • the upper limit of the peel strength is not particularly limited, and may be, for example, 30 N / 25 mm or less, 25 N / 25 mm or less, or 20 N / 25 mm or less.
  • the interlayer sheet in addition to the viscoelastic layer V 1 described above, the viscoelastic layer laminated on the viscoelastic layer V 1 (adhesive layer) V 2 may be further included.
  • the viscoelastic layer V 2 is 'is V2, the storage modulus G 25 ° C. of the viscoelastic layer V 1' storage modulus G 25 ° C. is preferably lower than the V1. That is, it is preferable that G'V2 (25) ⁇ G'V1 (25).
  • Such configuration interlayer sheet is due to the contribution of the viscoelastic layer V 2, it can be excellent in more flexible.
  • Storage modulus G 'V2 (25) is not particularly limited, may be in the range, for example, 1.0 kPa ⁇ 500 kPa. From the viewpoint of enhancing the effect of the following improvement for softening or deformation due to the viscoelastic layer V 2, in some embodiments, the storage modulus G 'V2 (25) is suitably not more than 400 kPa, 300 kPa It is preferably 200 kPa or less (for example, 180 kPa or less, or 150 kPa) or less, and may be 120 kPa or less, 90 kPa or less, or 70 kPa or less.
  • the refractive index n 2 of the V 2 are viscoelastic layer (adhesive layer) lower than the refractive index n 1 of V 1.
  • the refractive index n 2 of the pressure-sensitive adhesive layer V 2 if lower than the refractive index n 1 of the pressure-sensitive adhesive layer V 1 is not particularly limited, it may be, for example, in the range of about 1.35 to 1.55 ..
  • the refractive index n 2 of the viscoelastic layer V 2 is preferably 1.49 or less, more preferably 1.47 or less (for example, 1.46 or less, or 1.45 or less), 1.43 or less, 1.41 or less, and 1 It may be .40 or less.
  • the refractive index n 2 of the viscoelastic layer V 2 may be for example 1.36 or more, 1.38 It may be more than or equal to, 1.40 or more, or 1.42 or more.
  • the type of the pressure-sensitive adhesive constituting the viscoelastic layer V 2 is not particularly limited.
  • the pressure-sensitive adhesive constituting the viscoelastic layer V 2 is an acrylic polymer, a rubber-based polymer (for example, natural rubber, synthetic rubber, a mixture thereof, etc.), a polyester-based polymer, a urethane-based polymer, or a poly, which can be used in the field of pressure-sensitive adhesives. It may contain one or more of various rubber-like polymers such as an ether-based polymer, a silicone-based polymer, a polyamide-based polymer, and a fluorine-based polymer as a base polymer.
  • the acrylic polymer includes, for example, an alkyl (meth) acrylate and may further contain another monomer (copolymerizable monomer) copolymerizable with the alkyl (meth) acrylate. Polymers are preferred.
  • the content of the alkyl (meth) acrylate in the monomer raw material may be, for example, 10% by weight or more, 25% by weight or more, 35% by weight or more, or 45% by weight or more.
  • the acrylic polymer may be a polymer of a monomer component containing an alkyl (meth) acrylate as a main monomer and further containing the copolymerizable monomer as a submonomer.
  • the main monomer means a component that occupies more than 50% by weight of the monomer composition in the above-mentioned monomer raw material. More than 55% by weight or more than 60% by weight of the above monomer composition may be alkyl (meth) acrylate.
  • the copolymerizable monomer can be useful for introducing cross-linking points into the acrylic polymer and enhancing the cohesive force of the acrylic polymer.
  • Examples of the copolymerizable monomer include a carboxy group-containing monomer, a hydroxyl group-containing monomer, an acid anhydride group-containing monomer, an amide group-containing monomer, an amino group-containing monomer, a monomer having a nitrogen atom-containing ring, a sulfonic acid group-containing monomer, and phosphorus.
  • One or more functional group-containing monomers such as an acid group-containing monomer can be used.
  • copolymerizable monomers include vinyl ester-based monomers such as vinyl acetate, aromatic vinyl compounds such as styrene, non-aromatic ring-containing (meth) acrylates, and alkoxy group-containing monomers.
  • vinyl ester-based monomers such as vinyl acetate
  • aromatic vinyl compounds such as styrene
  • non-aromatic ring-containing (meth) acrylates and alkoxy group-containing monomers.
  • alkoxy group-containing monomers Specific examples, but like those described above as monomers that may be used as the base polymer of the viscoelastic layer V 1 is mentioned, but not limited to.
  • an acrylic polymer in which a carboxy group-containing monomer and / or a hydroxyl group-containing monomer is copolymerized is preferable as the copolymerizable monomer.
  • the carboxy group-containing monomer include acrylic acid and methacrylic acid.
  • the hydroxyl group-containing monomer include 2-hydroxyethy
  • a fluorine-containing monomer can be used as the copolymerizable monomer in order to lower the refractive index n 2 of the pressure-sensitive adhesive layer V 2.
  • the content of the fluorine-containing monomer in the monomer raw material may be, for example, 10% by weight or more, 25% by weight or more, or 35% by weight or more.
  • the content of the fluorine-containing monomer is preferably 40 wt% or more, more preferably 45 wt% or more, 55 wt%
  • the above is more preferable, and it may be 60% by weight or more, 75% by weight or more, 85% by weight or more, 90% by weight or more, or 95% by weight or more.
  • the upper limit of the content of the fluorine-containing monomer in the monomer raw material is not particularly limited, and may be 100% by weight. In some embodiments, from the viewpoint of cohesiveness, etc.
  • the content of the fluorine-containing monomer is suitably to be at 99.9 wt% or less, it is 99.5 or less Preferably, it may be 99% by weight or less, 97% by weight or less, or 92% by weight or less.
  • the fluorine-containing monomer may be used alone or in combination of two or more.
  • a fluorine-containing acrylic monomer can be preferably used as the fluorine-containing monomer.
  • the fluorine-containing acrylic monomer is not particularly limited as long as it is an acrylic monomer having at least one fluorine atom in the molecule.
  • a fluorine-containing (meth) acrylic acid ester can be preferably used.
  • Preferable examples of the fluorine-containing (meth) acrylic acid ester include those having a fluorinated hydrocarbon group at the ester terminal.
  • the fluorinated hydrocarbon group include a fluorinated aliphatic hydrocarbon group, a fluorinated alicyclic hydrocarbon group, and a fluorinated aromatic hydrocarbon group.
  • a fluorinated aliphatic hydrocarbon group is suitable.
  • the fluorinated aliphatic hydrocarbon group include a fluorinated alkyl group.
  • the aliphatic hydrocarbon moiety may be linear or branched.
  • the fluorine atom may be bonded to any carbon atom of the aliphatic hydrocarbon group moiety.
  • the number of fluorine atoms bonded to one carbon atom may be singular or plural.
  • the number of carbon atoms to which the fluorine atom is bonded is not particularly limited.
  • the number of carbon atoms at the hydrocarbon group site is not particularly limited.
  • a fluorinated aliphatic hydrocarbon group having, for example, about 1 to 18 (preferably 1 to 12) carbon atoms is preferable in consideration of compatibility with other copolymerizable monomers.
  • Specific examples of the fluoride aliphatic hydrocarbon group include methyl fluoride groups such as trifluoromethyl group, difluoromethyl group and monofluoromethyl group; pentafluoroethyl group, 1,1,2,2-tetrafluoroethyl group.
  • 1,2,2,2-tetrafluoroethyl group 1,1,2-trifluoroethyl group, 1,2,2-trifluoroethyl group, 2,2,2-trifluoroethyl group, 1,1 -Difluoroethyl group, 1,2-difluoroethyl group, 2,2-difluoroethyl group, 1-monofluoroethyl group, 2-monofluoroethyl group and other ethyl fluoride groups; and the like.
  • fluorinated alkyl group having 3 or more carbon atoms as in the case of the above-exemplified methyl fluorinated group and ethyl fluorinated group, one or more carbon atoms in any one or more of the carbon atoms in the alkyl group moiety may be used.
  • Various alkyl fluorinated groups to which the fluorine atom of the above is bonded can be exemplified.
  • Examples of the fluorinated alicyclic hydrocarbon group include a fluorinated cycloalkyl group. Similar to the above-mentioned fluorinated aliphatic hydrocarbon group, in the fluorinated alicyclic hydrocarbon group, the fluorine atom may be bonded to any carbon atom of the alicyclic hydrocarbon group into one carbon atom. The bonded fluorine atom may be singular or plural. Further, the number of carbon atoms to which the fluorine atom is bonded is not particularly limited.
  • the fluorinated alicyclic hydrocarbon group includes, for example, a cyclohexyl group having one fluorine atom such as a 2-fluorocyclohexyl group, a 3-fluorocyclohexyl group, and a 4-fluorocyclohexyl group; a 2,4-difluorocyclohexyl group, 2 , A cyclohexyl group having two fluorine atoms such as a 6-difluorocyclohexyl group; a cyclohexyl group having three fluorine atoms such as a 2,4,6-trifluorocyclohexyl group and the like are included.
  • a cyclohexyl group having one fluorine atom such as a 2-fluorocyclohexyl group, a 3-fluorocyclohexyl group, and a 4-fluorocyclohexyl group
  • the fluorinated hydrocarbon group may or may not have a substituent.
  • a substituent is not particularly limited, and examples thereof include a hydrocarbon group such as an alkyl group, an alkoxy group, a hydroxy group, a carboxy group, an amino group, a nitro group, a cyano group, and a halogen atom.
  • a hydrocarbon group such as an alkyl group, an alkoxy group, a hydroxy group, a carboxy group, an amino group, a nitro group, a cyano group, and a halogen atom.
  • one type may be used alone or two or more types may be used in combination.
  • Fluorine atom-containing (meth) acrylic acid ester [fluorinated (meth) acrylate] includes, for example, fluorine atom-containing (meth) acrylic acid alkyl ester [fluorinated alkyl (meth) acrylate] and fluorine atom-containing (meth) acrylic acid.
  • Cycloalkyl esters [fluorinated cycloalkyl (meth) acrylates], fluorine atom-containing (meth) acrylic acid aryl esters [fluorinated aryl (meth) acrylates] and the like are included.
  • fluorinated alkyl (meth) acrylate As the fluorine atom-containing (meth) acrylic acid ester, fluorinated alkyl (meth) acrylate (particularly, fluorinated alkyl acrylate) is suitable.
  • alkyl fluorinated (meth) acrylate examples include 2,2,2-trifluoroethyl acrylate (trade name "Viscoat 3F" manufactured by Osaka Organic Chemical Industry Co., Ltd.), 2,2,3,3-tetrafluoro.
  • Propyl acrylate (trade name "Viscoat 4F” manufactured by Osaka Organic Chemical Industry Co., Ltd.), 1H, 1H, 5H-octafluoropentyl acrylate (trade name “Viscoat 8F” manufactured by Osaka Organic Chemical Industry Co., Ltd.), 1H, 1H, 5H-octafluoropentyl methacrylate (trade name "Viscoat 8FM” manufactured by Osaka Organic Chemical Industry Co., Ltd.), 2- (Heptadecafluorononyl) ethyl acrylate (trade name "FA-108” manufactured by Kyoeisha Chemical Co., Ltd.) Etc.), 1H, 1H, 2H, 2H-tridecafluorooctyl acrylate (trade name "Viscoat 13F” manufactured by Osaka Organic Chemical Industry Co., Ltd.), and the like.
  • the number of carbon atoms of the fluorinated alkyl group in the fluorinated alkyl (meth) acrylate is preferably 3 or more, preferably 4 or more, from the viewpoint of the effect of lowering the refractive index, flexibility, and the like.
  • the above is more preferable, 6 or more or 7 or more is further preferable, and 8 or more is particularly preferable.
  • the number of carbon atoms of the fluorinated alkyl group is preferably 18 or less, preferably 14 or less, more preferably 12 or less, and may be 10 or less. It may be 9 or less.
  • the alkyl fluorinated group may have 7 or less carbon atoms or 5 or less carbon atoms.
  • the fluorine atom-containing (meth) acrylic acid ester is preferably a fluorinated alkyl (meth) acrylate in which fluorine is not bonded to the carbon at the 1-position of the alkyl group, for example, 1H, 1H, 2H. , 2H-Tridecafluorooctyl acrylate, a fluorinated alkyl (meth) acrylate in which fluorine is not bonded to either the 1-position carbon or the 2-position carbon of the alkyl group can be preferably adopted.
  • the content of the fluorine-containing acrylic monomer in the monomer raw material may be, for example, 10% by weight or more, 25% by weight or more, or 35% by weight or more.
  • the content of the fluorine-containing acrylic monomer is preferably 40 wt% or more, more preferably 45 wt% or more, It is more preferably 55% by weight or more, 60% by weight or more, 75% by weight or more, 85% by weight or more, 90% by weight or more, or 95% by weight or more.
  • the upper limit of the content of the fluorine-containing acrylic monomer in the monomer raw material is not particularly limited, and may be 100% by weight.
  • the content of the fluorine-containing acrylic monomer is suitably to be at 99.9 wt% or less, is 99.5 or less It is preferably 99% by weight or less, 97% by weight or less, and 92% by weight or less.
  • the fluorine-containing acrylic monomer may be used alone or in combination of two or more.
  • One or more functional group-containing monomers such as N-vinyl cyclic amides such as pyrrolidone), sulfonic acid group-containing monomers, and phosphoric acid group-containing monomers can be used.
  • Other examples of copolymerizable monomers include vinyl ester-based monomers such as vinyl acetate, aromatic vinyl compounds such as styrene, and non-aromatic ring-containing (meth) such as cycloalkyl (meth) acrylate and isobornyl (meth) acrylate. Acrylate, alkoxy group-containing monomer; and the like can be mentioned.
  • the content of the hydroxyl group-containing monomer in the monomer raw material is not particularly limited, and may be, for example, 0.01% by weight or more (preferably 0.1% by weight or more, more preferably 0.5% by weight or more). In some embodiments, the content of the hydroxyl group-containing monomer may be 0.7% by weight or more, 0.9% by weight or more, or 1.5% by weight or more of the monomer raw material. There may be.
  • the upper limit of the content of the hydroxyl group-containing monomer is not particularly limited, and may be, for example, 15% by weight or less or 10% by weight or less.
  • the content of the hydroxyl group-containing monomer in the monomer raw material is preferably less than 10% by weight, preferably less than 5% by weight, and 3% by weight. It may be less than%, less than 2.5% by weight, or less than 1.5% by weight.
  • the metallic material may be disposed in contact or in proximity to the viscoelastic layer V 2 (e.g., a metal wire or a metal film that may be present on an adherend Etc.), which is also advantageous from the viewpoint of suppressing corrosion.
  • the interlayer sheet disclosed herein can be preferably carried out in a manner in which the monomer raw material does not contain a carboxy group-containing monomer.
  • the monomer raw material for preparing the base polymer of the viscoelastic layer V 2 are acidic functional groups (including other carboxyl group, a sulfonic acid group, a phosphoric acid group or the like.) It is preferable that the content of the monomer having is limited. As the content of the acidic functional group-containing monomer in the monomer raw material of such an embodiment, the above-mentioned preferable content of the carboxy group-containing monomer can be applied. Interlayer sheet disclosed herein may be preferably carried out in the manner described above monomer raw material does not contain an acidic group-containing monomer (i.e. aspect based polymer is an acid-free viscoelastic layer V 2).
  • the base polymer of the pressure-sensitive adhesive layer V 2 can be prepared by appropriately adopting a known polymerization method like the base polymer of the pressure-sensitive adhesive layer V 1.
  • the weight average molecular weight of the base polymer (Mw) of not particularly limited, for example, may range approximately of 10 ⁇ 10 4 ⁇ 500 ⁇ 10 4, be in the range of about 20 ⁇ 10 4 ⁇ 200 ⁇ 10 4 good.
  • Mw of the base polymer of the pressure-sensitive adhesive layer V 2 is suitably not less 0.99 ⁇ 10 4 or less, 120 ⁇ 10 4 or less (e.g.
  • the amount of the isocyanate-based cross-linking agent used per 100 parts by weight of the base polymer may be, for example, 0.005 parts by weight or more. It may be 01 parts by weight or more, 0.05 parts by weight or more, or 0.08 parts by weight or more.
  • a viscoelastic material constituting each of the viscoelastic layer V 1, V 2, respectively, solvent type, active energy ray-curable, aqueous dispersion type pressure-sensitive adhesive in the form of a hot melt type or the like It can be a pressure-sensitive adhesive obtained by curing the agent composition by drying, cross-linking, polymerization, cooling, or the like, that is, a cured product of the pressure-sensitive adhesive composition.
  • the curing means for example, drying, cross-linking, polymerization, cooling, etc.
  • only one type may be applied, or two or more types may be applied simultaneously or in multiple stages.
  • either one or both of the viscoelastic layers V 1 and V 2 may be a post-curable pressure-sensitive adhesive layer, which is a non-post-curable pressure-sensitive adhesive layer.
  • the pressure-sensitive adhesive layer having post-curability refers to a pressure-sensitive adhesive layer that can be further cured by irradiation with heat or active energy rays (for example, ultraviolet rays).
  • the post-curable pressure-sensitive adhesive layer include a pressure-sensitive adhesive layer having an unreacted ethylenically unsaturated group in the side chain of the base polymer, and a pressure-sensitive adhesive layer containing an unreacted polyfunctional monomer.
  • the thickness of the viscoelastic layer V 1 is not particularly limited, and can be, for example, 3 ⁇ m or more, preferably 5 ⁇ m or more. According to the thickness 5 ⁇ m or more viscoelastic layers V 1, good adhesion properties can be easily obtained. Further, the viscoelastic layer V 1 of the such thickness tends to bond with good adhesion to the adherend by absorbing irregularities that may be present in the adherend surfaces. It is preferable that the thickness of the viscoelastic layer V 1 is 5 ⁇ m or more from the viewpoint of preventing coloring and color unevenness due to light interference.
  • the technique disclosed herein can be preferably carried out, for example, in an embodiment in which the thickness of the viscoelastic layer V 1 is in the range of 3 ⁇ m to 200 ⁇ m (more preferably 5 ⁇ m to 100 ⁇ m).
  • the thickness of the viscoelastic layer V 2 can be selected from the same range as the thickness of the viscoelastic layer V 1 exemplified above.
  • the thickness of the viscoelastic layer V 1 and the thickness of the viscoelastic layer V 2 may be about the same or different.
  • the thickness of the pressure-sensitive adhesive layer is the thickness of the interlayer sheet.
  • the interlayer sheet (adhesive sheet) according to some aspects may be in the form of a pressure-sensitive adhesive sheet with a base material having an pressure-sensitive adhesive layer on one side or both sides of the support base material.
  • the material of the supporting base material is not particularly limited, and can be appropriately selected depending on the purpose of use, the mode of use, and the like of the adhesive sheet.
  • Non-limiting examples of base materials that can be used include polyester films containing polyester as a main component such as polypropylene (PP) and ethylene-propylene copolymer, polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene na.
  • Polyester film containing polyester as the main component such as phthalate (PEN), plastic film such as polyvinyl chloride film containing polyvinyl chloride as the main component; foams such as polyurethane foam, polyethylene (PE) foam, and polychloroprene foam.
  • Foam sheet woven fabrics and non-woven fabrics made of various fibrous substances (natural fibers such as hemp and cotton, synthetic fibers such as polyester and vinylon, semi-synthetic fibers such as acetate, etc.) alone or in a blended manner; Papers such as Japanese paper, high-quality paper, kraft paper, and crepe paper; metal foils such as aluminum foil and copper foil; and the like can be mentioned.
  • a base material having a composite structure of these may be used. Examples of such a composite base material include a base material having a structure in which a metal foil and the plastic film are laminated, a plastic base material reinforced with an inorganic fiber such as glass cloth, and the like.
  • the film base material may be a porous base material such as a foam film or a non-woven fabric sheet, or may be a non-porous base material, and may be a porous layer and a non-porous layer. May be a base material having a laminated structure.
  • the film base material those containing an independently shape-maintainable (self-supporting or independent) resin film as a base film can be preferably used.
  • the "resin film” means a resin film (of voidless) having a non-porous structure and typically containing substantially no bubbles. Therefore, the resin film is a concept that is distinguished from foam films and non-woven fabrics.
  • the resin film one that can independently maintain its shape (self-supporting or independent) can be preferably used.
  • the resin film may have a single-layer structure or a multi-layer structure having two or more layers (for example, a three-layer structure).
  • Examples of the material constituting the resin film include a polyester-based resin containing a polyester as a main component, such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), polyethylene (PE), and polypropylene (PP).
  • PET polyethylene terephthalate
  • PBT polybutylene terephthalate
  • PEN polyethylene naphthalate
  • PE polyethylene
  • PP polypropylene
  • the resin film may be formed by using a resin material containing one kind of such a resin alone, or may be formed by using a resin material in which two or more kinds are blended. May be good.
  • the resin film may be unstretched or stretched (for example, uniaxially stretched or biaxially stretched).
  • a blended film or the like can be preferably used.
  • preferable resin films from the viewpoint of strength and dimensional stability include PET film, PEN film, PPS film and PEEK film. From the viewpoint of availability, PET film and PPS film are particularly preferable, and PET film is particularly preferable.
  • Known resin films include light stabilizers, antioxidants, antistatic agents, colorants (dyees, pigments, etc.), fillers, slip agents, antiblocking agents, etc., as long as the effects of the present invention are not significantly impaired.
  • Additives can be blended as needed.
  • the blending amount of the additive is not particularly limited, and can be appropriately set according to the use of the pressure-sensitive adhesive sheet and the like.
  • the manufacturing method of the resin film is not particularly limited.
  • conventionally known general resin film molding methods such as extrusion molding, inflation molding, T-die casting molding, and calendar roll molding can be appropriately adopted.
  • the transmittance meter As the transmittance meter, the product name "HAZEMETER HM-150" manufactured by Murakami Color Technology Research Institute or its equivalent is used.
  • a preferable example of the light-transmitting base material is a resin film having light-transmitting property.
  • the light-transmitting substrate may be an optical film.
  • the thickness of the base material is not particularly limited and can be selected according to the purpose and mode of use of the interlayer sheet.
  • the thickness of the base material may be, for example, 500 ⁇ m or less, preferably 300 ⁇ m or less from the viewpoint of handleability and processability of the interlayer sheet, 150 ⁇ m or less, 100 ⁇ m or less, 50 ⁇ m or less, and 25 ⁇ m. It may be less than or equal to 10 ⁇ m or less. As the thickness of the base material becomes smaller, the ability to follow the surface shape of the adherend tends to improve. Further, from the viewpoint of handleability, processability and the like, the thickness of the base material may be, for example, 2 ⁇ m or more, 10 ⁇ m or more, or 25 ⁇ m or more.
  • the thickness of the interlayer sheet may be, for example, 1000 ⁇ m or less, 350 ⁇ m or less, 200 ⁇ m or less, 120 ⁇ m or less. It may be 75 ⁇ m or less, or 50 ⁇ m or less. Further, the thickness of the interlayer sheet may be, for example, 10 ⁇ m or more, 25 ⁇ m or more, 80 ⁇ m or more, or 130 ⁇ m or more from the viewpoint of handleability and the like.
  • the thickness of the interlayer sheet means the thickness of the portion to be attached to the adherend. For example, in the interlayer sheet 1 having the configuration shown in FIG. 1, it refers to the thickness from the first surface (adhesive surface) 10A of the pressure-sensitive adhesive layer to the second surface 20B of the supporting base material, and does not include the thickness of the release liner 30. ..
  • the interlayer sheet (adhesive sheet) disclosed herein may take the form of an adhesive product in which the surface (adhesive surface) of the adhesive layer is brought into contact with the release surface of the release liner. Therefore, the present specification provides an interlayer sheet (adhesive product) with a release liner including any of the interlayer sheets disclosed herein and a release liner having a release surface that abuts on the adhesive surface of the interlayer sheet. NS.
  • the release liner is not particularly limited, and for example, a release liner having a release treatment layer on a release liner base material such as a resin film or paper (paper in which a resin such as polyethylene is laminated) or a fluorine-based release liner.
  • a release liner base material such as a resin film or paper (paper in which a resin such as polyethylene is laminated) or a fluorine-based release liner.
  • a release liner made of a resin film formed of a low adhesive material such as a polymer (polytetrafluoroethylene or the like) or a polyolefin resin (polyethylene, polypropylene, etc.) can be used.
  • the peeling treatment layer may be formed by surface-treating the peeling liner base material with a peeling treatment agent.
  • the stripping agent may be a known stripping agent such as a silicone-based stripping agent, a long-chain alkyl-based stripping agent, a fluorine-based stripping agent, or molybdenum sulfide (IV).
  • a release liner having a release treatment layer with a silicone-based release treatment agent can be preferably adopted.
  • the thickness and forming method of the peeling treatment layer are not particularly limited, and can be set so that appropriate peeling property is exhibited on the adhesive surface side surface of the peeling liner.
  • a release liner having a release treatment layer on a resin film (hereinafter, also referred to as a release film base material) as a release liner base material (hereinafter, peeling).
  • a release film base material a resin film
  • peeling a release liner base material
  • a film a release liner base material
  • Various plastic films can be used as the release film base material.
  • a plastic film is typically a non-porous sheet, a concept that distinguishes it from, for example, non-woven fabrics (ie, does not include non-woven fabrics).
  • polyester resins such as polyethylene terephthalate (PET), polybutylene terephthalate (PBT), and polyethylene naphthalate (PEN), polyethylene (PE), polypropylene (PP), and ethylene-propylene co-weight.
  • polyolefin resin such as ethylene-butene copolymer, cellulose resin such as triacetyl cellulose, acetate resin, polysulfone resin, polyether sulfone resin, polycarbonate resin, polyamide resin, polyimide resin, norbornene resin
  • Cyclic polyolefin resin such as resin, (meth) acrylic resin, polyvinyl chloride resin, polyvinylidene chloride resin, polystyrene resin, polyvinyl alcohol resin, ethylene-vinyl acetate copolymer resin, ethylene-vinyl alcohol co-weight Examples thereof include a coalesced resin, a polyarylate resin, and a polyphenylene sulfide resin.
  • a release film base material formed from any one or a mixture of two or more of these resins can be used.
  • a preferable release film base material includes a polyester-based resin film (for example, PET film) formed from a polyester-based resin.
  • the plastic film used as the above-mentioned release film base material may be any of a non-stretched film, a uniaxially stretched film, and a biaxially stretched film. Further, the plastic film may have a single-layer structure or a multi-layer structure including two or more sub-layers.
  • the plastic film is an adhesive sheet containing antioxidants, antioxidants, heat stabilizers, light stabilizers, ultraviolet absorbers, colorants such as pigments and dyes, lubricants, fillers, antioxidants, nucleating agents, etc.
  • a known additive that can be used for the release film base material of the above may be blended. In the multi-layered plastic film, each additive may be blended in all sublayers or only in some sublayers.
  • a release liner (hereinafter, also referred to as one release liner) arranged on one adhesive surface and the other.
  • the release liner (hereinafter, also referred to as the other release liner) arranged on the adhesive surface of the above may have the same material and composition, or may have a different material and composition. ..
  • the thickness of the release liner (preferably the release film) is not particularly limited, and may be, for example, about 10 ⁇ m to 500 ⁇ m. From the viewpoint of the strength and dimensional stability of the release liner, the thickness of the release liner is preferably 20 ⁇ m or more, preferably 30 ⁇ m or more, 35 ⁇ m or more, 40 ⁇ m or more, or 45 ⁇ m or more. good. Further, from the viewpoint of handleability of the release liner (for example, ease of winding), the thickness of the release liner is preferably 300 ⁇ m or less, preferably 250 ⁇ m or less, and may be 200 ⁇ m or less. It may be 150 ⁇ m or less, or 130 ⁇ m or less.
  • the thickness of the release liner is approximately 125 ⁇ m or less, may be approximately 115 ⁇ m or less, may be approximately 105 ⁇ m or less, may be approximately 90 ⁇ m or less, and may be approximately 70 ⁇ m or less.
  • the thicknesses of the release liners may be the same or different. In some aspects, from the viewpoint of peeling workability and the like, it is preferable that one peeling liner and the other peeling liner have different thicknesses, for example, the thicker peeling liner has a thinner thickness.
  • the thickness of the release liner is preferably about 1.1 times or more (for example, about 1.25 times or more. The upper limit is not particularly limited, but for example, 5 times or less).
  • the release liner (preferably the release film) is often limited in that the arithmetic mean roughness Ra of the surface on the adhesive surface side is limited to a predetermined value or less (for example, about 100 nm or less, further less than 50 nm). It is preferable from the viewpoint of realizing an adhesive surface having surface smoothness.
  • the arithmetic mean roughness Ra of the adhesive surface side surface of the release liner is, for example, preferably about 30 nm or less, more preferably about 25 nm or less, about 20 nm or less, and about 18 nm or less. It may be.
  • the arithmetic mean roughness Ra may be, for example, about 5 nm or more, about 10 nm or more, or about 15 nm or more. ..
  • both the adhesive surface side surfaces of both release liners satisfy any of the above-mentioned arithmetic mean roughness Ra. Is preferable.
  • the arithmetic mean roughness Ra of the adhesive surface side surfaces of both release liners may be about the same or different.
  • the release liner (preferably a release film) preferably has a maximum height Rz of the surface on the adhesive surface side of 700 nm or less from the viewpoint of realizing an adhesive surface having high surface smoothness.
  • the maximum height Rz of the adhesive surface side surface of the release liner is preferably about 600 nm or less, may be about 500 nm or less, may be about 400 nm or less, and may be about 300 nm or less.
  • the maximum height Rz may be, for example, about 50 nm or more, about 80 nm or more, or about 100 nm or more. It may be about 200 nm or more, and may be about 300 nm or more.
  • the adhesive surface side surfaces of both release liners satisfy any of the above-mentioned maximum heights Rz. Is preferable.
  • the maximum height Rz of the adhesive surface side surfaces of both release liners may be about the same or different.
  • the arithmetic mean roughness Ra and the maximum height Rz of the back surface (opposite surface of the adhesive layer side) of the release liner (preferably the release film) are not particularly limited.
  • the arithmetic mean roughness Ra on the back surface of the peeling liner may be, for example, more than 30 nm (for example, more than 35 nm, more preferably about 50 nm or more) from the viewpoint of productivity and the like.
  • the maximum height Rz of the back surface of the release liner may be, for example, more than 400 nm (for example, about 500 nm or more) or more than 800 nm (for example, 1000 nm or more) from the viewpoint of productivity and the like.
  • the arithmetic mean roughness Ra and the maximum height Rz of the peeled film surface can be adjusted by the selection of the film material, the molding method, the surface treatment such as the peeling treatment, and the like. For example, adjusting the smoothness of the layers constituting the peelable surface (anti-blocking layer, hard coat layer, oligomer prevention layer, etc.), reducing the amount of filler particles in the surface layer or the release film base material, or eliminating the use (particle-free). ), In addition, adjustment of stretching conditions and the like can be mentioned.
  • the arithmetic mean roughness Ra and the maximum height Rz of the surface of the release liner (preferably the release film) are measured using a non-contact type surface roughness measuring device.
  • a non-contact type surface roughness measuring device a light interference type surface roughness measuring device is used, and for example, a three-dimensional optical profiler (trade name "NewView7300", manufactured by ZYGO) or an equivalent product thereof can be used.
  • a glass plate sida lime glass plate manufactured by MATSUNAMI, thickness 1.3 mm
  • the surface shape can be measured using a three-dimensional optical profiler (trade name "NewView7300", manufactured by ZYGO).
  • the interlayer sheet disclosed herein can be used by being bonded to various adherends.
  • the constituent material (adhesion material) of the adherend is not particularly limited, but for example, copper, silver, gold, iron, tin, palladium, aluminum, nickel, titanium, chromium, indium, and zinc. Etc., or metal materials such as alloys containing two or more of these, for example, polyimide-based resin, acrylic-based resin, polyether nitrile-based resin, polyether sulfone-based resin, polyester-based resin (PET-based resin, polyethylene naphthalate-based).
  • Polyvinyl chloride resins Polyphenylene sulfide resins, polyether ether ketone resins, polyamide resins (so-called aramid resins, etc.), polyarylate resins, fluorine resins, polycarbonate resins, diacetyl celluloses and triacetyls.
  • Various resin materials such as cellulose-based polymers such as cellulose, vinyl butyral polymers, liquid crystal polymers, and carbon materials such as graphene, alumina, zirconia, titania, SiO 2 , ITO (indium tin oxide), Metal oxides such as ATO (antimonated tin oxide) and their mixtures, nitrides such as aluminum nitride, silicon nitride, titanium nitride, gallium nitride, indium nitride and their composites, alkaline glass, non-alkali glass, quartz glass, hokei Examples thereof include inorganic materials such as acid glass and sapphire glass.
  • the interlayer sheet disclosed herein can be used by being attached to a member (for example, an optical member) whose surface is at least composed of the above materials.
  • the interlayer sheet disclosed here can be used in a bonding mode that does not require a treatment of heating to a temperature higher than a temperature range of about room temperature (for example, 20 ° C. to 35 ° C.) after being bonded to an adherend. Further, if it is permissible depending on the constituent material of the interlayer sheet (for example, the material of the base material) and the type of the adherend, after bonding to the adherend, at the time of bonding, and before bonding, The heat treatment may be performed at at least any timing. The heat treatment can be performed for the purpose of improving the adhesion of the pressure-sensitive adhesive to the adherend and promoting adhesion.
  • the member or material to which the interlayer sheet is attached or laminated may have light transmission.
  • the total light transmittance of the adherend may be, for example, more than 50%, and may be 70% or more.
  • the total light transmittance of the adherend is 80% or more, more preferably 90% or more, still more preferably 95% or more (for example, 95 to 100%).
  • the interlayer sheet disclosed herein can be preferably used in a mode of being attached or laminated on an adherend (for example, an optical member) having a total light transmittance of a predetermined value or more.
  • a viscoelastic layer e.g. viscoelastic layer V 1 which is arranged in contact with the adherend, may be viscoelastic layer V 2 is in a form having a viscoelastic layer V 2.
  • the refractive index of the viscoelastic layer typically the pressure-sensitive adhesive layer
  • the viscoelastic layer typically, the pressure-sensitive adhesive layer
  • the viscoelastic layer is incident on the pressure-sensitive adhesive layer from the adherend side at an angle equal to or less than the critical angle.
  • the light to be emitted can be refracted to the front side to increase the front brightness.
  • the refractive index of the adherend may be, for example, 1.55 or less, 1.50 or less, 1.48 or less, 1.45 or less, less than 1.45, or, for example, 1. It can be .10 or higher, 1.20 or higher, 1.30 or higher, or 1.35 or higher.
  • the adherend having a relatively high refractive index with respect to the pressure-sensitive adhesive layer the light incident on the adherend from the pressure-sensitive adhesive layer side can be refracted to the front side to increase the front luminance.
  • the refractive index of the adherend may be, for example, 1.60 or more, 1.65 or more or 1.70 or more, and for example, 3.00 or less, 2.50 or less or 2.00 or less. Can be.
  • the refractive index of the adherend may be about 1.55 to 1.80, about 1.55 to 1.75, or about 1.60 to 1.70.
  • the refractive index of the adherend can be measured in the same manner as the refractive index of the pressure-sensitive adhesive.
  • the adherend may have any of the refractive indexes described above and any of the total light transmittances described above.
  • the effects of the techniques disclosed herein are particularly preferred in aspects of attachment or stacking to such adherends.
  • An example of a preferable application is an optical application. More specifically, it is disclosed herein as, for example, an optical adhesive sheet used for bonding optical members (for bonding optical members), manufacturing products using the above optical members (optical products), and the like.
  • the interlayer sheet to be used can be preferably used.
  • the optical member is not particularly limited, and examples thereof include members made of glass, acrylic resin, polycarbonate, polyethylene terephthalate, a metal thin film, and the like (for example, sheet-shaped, film-shaped, and plate-shaped members).
  • the "optical member” in this specification also includes a member (design film, decorative film, surface protective film, etc.) that plays a role of decoration and protection while maintaining the visibility of the display device and the input device.
  • Viscoelastic layer (preferably the adhesive layer of the interlayer sheet disclosed herein. Including for example, pressure-sensitive adhesive layer having a single layer structure made of viscoelastic layer V 1, or a viscoelastic layer V 1 and viscoelastic layer V 2
  • the adhesive layer having a laminated structure in which two or more adhesive layers are directly in contact with each other) is, for example, an optical of a light guide film, a diffusion film, a fluorescent film, a toning film, a prism sheet, a lenticular film, a microlens array film, or the like. It can be preferably used for bonding films. In these applications, thinning and improvement of light extraction efficiency are required from the viewpoint of miniaturization and high performance of optical members.
  • the scattering component can be reduced and the light transmittance can be improved by appropriately adjusting the refractive index of the pressure-sensitive adhesive so that the difference in the refractive index from the toning pigment is small.
  • the diffraction of light can be controlled by appropriately adjusting the refractive index of the pressure-sensitive adhesive, which can contribute to the improvement of brightness and / or viewing angle.
  • the interlayer sheet disclosed herein is preferably used in a manner of being attached to an adherend having a high refractive index (which may be a layer or a member having a high refractive index), and is used to cause interfacial reflection with the adherend. It can be suppressed.
  • an adherend having a high refractive index which may be a layer or a member having a high refractive index
  • the adhesion at the interface with the adherend is high.
  • the thickness of the pressure-sensitive adhesive layer is high, and for example, the surface smoothness of the pressure-sensitive adhesive surface is high.
  • the thickness of the adherend with a high refractive index is relatively small (for example, when it is 5 ⁇ m or less, 4 ⁇ m or less, or 2 ⁇ m or less), from the viewpoint of suppressing coloring and color unevenness due to the interference of reflected light, at the interface. Suppressing reflexes is especially meaningful.
  • an interlayer sheet disclosed herein because it comprises a viscoelastic layer V 1 of the high refractive index, bonded to the light-emitting layer of an optical semiconductor such as (e.g., mainly the light emitting layer of the high refractive constituted by an inorganic material) It can be preferably used in the attached embodiment.
  • an optical semiconductor such as (e.g., mainly the light emitting layer of the high refractive constituted by an inorganic material)
  • Interlayer sheet used in such manner as the viscoelastic layer V 1, it is preferable to provide a pressure-sensitive adhesive layer having a high refractive index.
  • the interlayer sheet is preferably low in color. This can also be advantageous from the viewpoint of suppressing unintentional coloring caused by the interlayer sheet.
  • Viscoelastic layer V 1 disclosed herein have since suitable high refractive index, a high refractive index of the lens (e.g., lens or constituted by the high refractive index resin, the surface layer made of a high refractive index resin Even if it is placed in contact with the lens), the difference in refractive index from the lens can be reduced. This is advantageous from the viewpoint of reducing the thickness of the lens and the product provided with the lens, and can also contribute to the suppression of aberration and the improvement of the Abbe number.
  • the mode in which the optical members are bonded using the interlayer sheet disclosed herein is not particularly limited, and examples thereof include (1) a mode in which the optical members are bonded to each other via the interlayer sheet disclosed here, and (2).
  • the optical member may be attached to a member other than the optical member via the interlayer sheet disclosed here, or (3) the interlayer sheet disclosed here includes the optical member.
  • the interlayer sheet may be attached to an optical member or a member other than the optical member.
  • the interlayer sheet in the form including the optical member may be, for example, an interlayer sheet in which the support is an optical member (for example, an optical film).
  • the interlayer sheet in the form of including the optical member as the support can also be grasped as an adhesive type optical member (for example, an adhesive type optical film).
  • an adhesive type optical member for example, an adhesive type optical film
  • the interlayer sheet disclosed here is a type of adhesive sheet having a support and the functional film is used as the support, the interlayer sheet disclosed here is the functional film. It can also be grasped as a "adhesive type functional film" having an adhesive layer disclosed herein on at least one side.
  • an optical laminate including the interlayer sheet disclosed here and a member (for example, a resin film such as an optical film) to which the interlayer sheet is attached is provided. ..
  • the member to which the interlayer sheet is attached may have the refractive index of the adherend material described above.
  • the difference (refractive index difference) between the refractive index of the member layers constituting the adhesive surface of the interlayer sheet (e.g. viscoelastic layer V 1), the refractive index of the adhesive layer and the adherend mentioned above It can be a difference. Since the members constituting the laminated body have been described as the above-mentioned members, materials, and adherends, the overlapping description will not be repeated.
  • An adhesive sheet containing an adhesive layer It has an adhesive surface composed of the above adhesive layer and has an adhesive surface.
  • the pressure-sensitive adhesive layer is a pressure-sensitive adhesive sheet having a refractive index of more than 1.570, a total light transmittance of 86% or more, and a haze value of 3.0% or less.
  • the additive (H RO ) according to any one of the above [11] to [13], which comprises at least one compound selected from the group consisting of an aromatic ring-containing compound and a heterocyclic ring-containing compound.
  • Adhesive composition [15] The pressure-sensitive adhesive composition according to any one of [11] to [14] above, wherein the additive (H RO) contains a compound having two or more aromatic rings in one molecule.
  • the additive ( HRO ) is a compound having two or more aromatic rings in one molecule. (I) Containing a structure in which two non-condensed aromatic rings are directly chemically bonded, and (ii) Containing a structure in which two non-condensed aromatic rings are condensed.
  • the content of the aromatic ring-containing monomer (m1) is more than 70% by weight and less than 100% by weight.
  • An interlayer sheet used by arranging between layers of a laminated body in optical applications Refractive index n 1 comprises a viscoelastic layer V 1 is 1.570 or more, and the total light transmittance is 86% or more; Haze value is 1.0% or less; and The storage modulus G'at 25 ° C. is 30 kPa to 700 kPa; An interlayer sheet that meets the requirements.
  • the interlayer sheet according to the above [24] which has a thickness of 5 ⁇ m or more.
  • the acrylic polymer A1 has a Tg (that is, Tg T ) based on the composition of the monomer component at ⁇ 35 ° C. and a Tg (that is, Tg m1 ) based on the composition of the aromatic ring-containing monomer at ⁇ 35 ° C.
  • the solution (50%) of the acrylic polymer A1 is diluted to 30% with ethyl acetate, and an isocyanurate compound of hexamethylene diisocyanate (manufactured by Toso Co., Ltd., trade name) is added to 334 parts (nonvolatile content 100 parts) of this solution as a cross-linking agent.
  • oligomer B After adding 3.5 parts of ⁇ -thioglycerol and 67 parts of methyl ethyl ketone as the transfer agent, nitrogen gas was flowed and nitrogen substitution was carried out for about 1 hour with stirring. Then, the flask was heated to 70 ° C. and reacted for 12 hours to obtain an acrylic oligomer (oligomer B) having a weight average molecular weight (Mw) of 4000 and a refractive index of 1.63.
  • Mw weight average molecular weight
  • the solution (50%) of the acrylic polymer A2 is diluted to 30% with ethyl acetate, and 20 parts of the oligomer B prepared above is added to 334 parts (100 parts of non-volatile content) of this solution, and hexamethylene diisocyanate as a cross-linking agent.
  • a solution (33%) of the acrylic polymer A3 is diluted to 30% with ethyl acetate, and an isocyanurate compound of hexamethylene diisocyanate as a cross-linking agent (manufactured by Tosoh Corporation, trade name " 10 parts (0.1 part of non-volatile content) of a 1% ethyl acetate solution of "Coronate HX" (trifunctional isocyanate compound) was added and mixed by stirring to prepare an acrylic pressure-sensitive adhesive composition C3.
  • an isocyanurate compound of hexamethylene diisocyanate as a cross-linking agent
  • Example 1 The acrylic pressure-sensitive adhesive composition C1 prepared above is applied to the silicone-treated surface of polyethylene terephthalate (PET) film R1 (thickness 50 ⁇ m) having a silicone treatment on one side, and heated at 130 ° C. for 2 minutes. A pressure-sensitive adhesive layer having a thickness of 25 ⁇ m was formed. A silicone-treated surface of PET film R2 (thickness 38 ⁇ m) having been treated with silicone on one side was bonded to the surface of the pressure-sensitive adhesive layer. In this way, both sides to obtain a PET film (release liner) R1, the form of the pressure-sensitive adhesive layer protected by R2 (the pressure-sensitive adhesive layer V 1).
  • PET polyethylene terephthalate
  • the peeling liner R2 is relatively light peeling as compared with the peeling liner R1. Further, the acrylic pressure-sensitive adhesive composition C3 prepared above is applied to the silicone-treated surface of PET film R1 (thickness 50 ⁇ m) having a silicone treatment on one side, and heated at 130 ° C. for 2 minutes to increase the thickness. to form a pressure-sensitive adhesive layer V 2 of 10 [mu] m. A silicone-treated surface of PET film R2 (thickness 38 ⁇ m) having been treated with silicone on one side was bonded to the surface of the pressure-sensitive adhesive layer. In this way, both sides obtain PET film (release liner) R1, the form of the pressure-sensitive adhesive layer protected by R2 (pressure-sensitive adhesive layer V 2).
  • Example 2 The pressure-sensitive adhesive layer V 1 is the same as in Example 1 except that the types of pressure-sensitive adhesive compositions used to form the pressure-sensitive adhesive layers V 1 and V 2 and the thickness of each pressure-sensitive adhesive layer are changed as shown in Table 1. An interlayer sheet (base-less double-sided adhesive sheet) having a two-layer structure of / V 2 was obtained.
  • the obtained interlayer sheet was sufficiently acclimatized to an environment of 23 ° C. and 50% RH, and then used for the following measurements and evaluations.
  • Total light transmittance and haze value Using a test piece in which the interlayer sheets according to each example were bonded to non-alkali glass (thickness 0.8 to 1.0 mm, total light transmittance 92%, haze 0.4%), under a measurement environment of 23 ° C. , Haze meter (manufactured by Murakami Color Technology Laboratory, trade name "HAZEMETER HM-150") was used to measure the total light transmittance and haze of the above test piece. The value obtained by subtracting the total light transmittance and haze of the non-alkali glass from the measured value was taken as the total light transmittance and haze value of the interlayer sheet. The results are shown in Table 1.
  • interlayer sheet of Examples 1-4 the refractive index n 1 is 1.570 or more, the storage elastic modulus G 'V1 is (25) comprises the following adhesive layer V 1 700 kPa, and the It showed high transparency in the interlayer sheet.
  • These interlayer sheets exhibited practical peel strength suitable for bonding between layers of optical members.
  • the adhesive layer (adhesive layer V 2 ) of Example 5 having a low refractive index and the adhesive layer (adhesive layer V 1 ) of Examples 3 and 4 having a high refractive index were combined.
  • the interlayer sheets of Examples 1 and 2 having the pressure-sensitive adhesive layer having a laminated structure an effect of improving the front brightness by 10% or more was observed as compared with the case where the interlayer sheet was not used.
  • the pressure-sensitive adhesive layer of the interlayer sheet has a single-layer structure, the effect of improving the front luminance by the interlayer sheet alone was not observed.
  • the effect of improving the front luminance can be exhibited in the laminated body with the member.
  • the interlayer sheet of Example 5 on a member having a higher refractive index (for example, a resin film), the effect of improving the front luminance can be exhibited in the laminated body with the member.
  • ⁇ Preparation of acrylic pressure-sensitive adhesive composition C4> In a four-necked flask equipped with a stirring blade, a thermometer, a nitrogen gas introduction tube and a cooler, 79 parts of POB-A, 20 parts of n-butyl acrylate (BA), and 1 part of 4HBA as monomer components, polymerization started. 0.2 part of AIBN as an agent and 100 parts of toluene as a polymerization solvent were charged, nitrogen gas was introduced while gently stirring, and the polymerization reaction was carried out for 6 hours while keeping the liquid temperature in the flask at around 60 ° C. to carry out an acrylic polymer. A solution of A4 (50%) was prepared. The Mw of this acrylic polymer A4 was 520,000.
  • the solution (50%) of the acrylic polymer A4 is diluted to 30% with ethyl acetate, and 10 parts (nonvolatile content) of 1% ethyl acetate solution of coronate HX as a cross-linking agent is added to 334 parts (nonvolatile content 100 parts) of this solution. 0.1 part), 2 parts of acetylacetone as a cross-linking retardant, and 1 part (0.01 part of non-volatile content) of 1% ethyl acetate solution of Nasem ferric iron as a cross-linking catalyst are added and mixed by stirring to form an acrylic pressure-sensitive adhesive.
  • Object C4 was prepared.
  • P2HA in the composition of the above-mentioned monomer component is phenoxydiethylene glycol acrylate (manufactured by Kyoeisha Chemical Co., Ltd., trade name "light acrylate P2HA", refractive index: 1.510, homopolymer Tg: -35 ° C.). show.
  • the Mw of this acrylic polymer A6 was 1 million.
  • Acrylic pressure-sensitive adhesive composition C8 Acrylic pressure-sensitive adhesive in the same manner as the preparation of the acrylic pressure-sensitive adhesive composition C7, except that 10 parts of POB-A was changed to 10 parts of 3-phenoxybenzyl alcohol (manufactured by Tokyo Chemical Industry Co., Ltd., refractive index 1.59).
  • the agent composition C8 was prepared.
  • Example 6 ⁇ Preparation of interlayer sheet> (Examples 6 to 10) Except that the kind of the pressure-sensitive adhesive composition used for forming the pressure-sensitive adhesive layer V 1, V 2 and the thickness of each adhesive layer were as shown in Table 3 in the same manner as Example 1, the adhesive layer V 1 / to obtain an interlayer sheet having a two-layer structure of the adhesive layer V 2 (substrate-less double-sided pressure-sensitive adhesive sheet).
  • interlayer sheet Examples 6-10 the refractive index n 1 is 1.570 or more, the storage elastic modulus G 'V1 is (25) comprises the following adhesive layer V 1 700 kPa, and the It showed high transparency in the interlayer sheet. These interlayer sheets exhibited practical peel strength suitable for bonding between layers of optical members.

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