WO2022176658A1 - 接着剤層および接着剤層を有する光学積層体 - Google Patents
接着剤層および接着剤層を有する光学積層体 Download PDFInfo
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- WO2022176658A1 WO2022176658A1 PCT/JP2022/004554 JP2022004554W WO2022176658A1 WO 2022176658 A1 WO2022176658 A1 WO 2022176658A1 JP 2022004554 W JP2022004554 W JP 2022004554W WO 2022176658 A1 WO2022176658 A1 WO 2022176658A1
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- adhesive layer
- adhesive
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Images
Classifications
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- G02B5/021—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures
- G02B5/0231—Diffusing elements; Afocal elements characterised by the diffusing properties the diffusion taking place at the element's surface, e.g. by means of surface roughening or microprismatic structures the surface having microprismatic or micropyramidal shape
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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]
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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
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- 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
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
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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
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
- C09J167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
- C09J167/00—Adhesives based on polyesters obtained by reactions forming a carboxylic ester link in the main chain; Adhesives based on derivatives of such polymers
- C09J167/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
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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
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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
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- G02C1/06—Bridge or browbar secured to or integral with closed rigid rims for the lenses
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/199—Acids or hydroxy compounds containing cycloaliphatic rings
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/672—Dicarboxylic acids and dihydroxy 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
- C09J2203/00—Applications of adhesives in processes or use of adhesives in the form of films or foils
- C09J2203/318—Applications of adhesives in processes or use of adhesives in the form of films or foils for the production of liquid crystal displays
-
- 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
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
-
- 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
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/12—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers
- C09J2301/122—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the arrangement of layers the adhesive layer being present only on one side of the carrier, e.g. single-sided adhesive tape
-
- 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
- C09J2301/10—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet
- C09J2301/16—Additional features of adhesives in the form of films or foils characterized by the structural features of the adhesive tape or sheet by the structure of the carrier layer
-
- 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
-
- 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
- C09J2467/00—Presence of polyester
-
- 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
- C09J2475/00—Presence of polyurethane
Definitions
- the present invention relates to an adhesive layer and an optical laminate having such an adhesive layer.
- Optical sheets e.g., microlens sheets, prism sheets, brightness enhancement films (e.g., 3M Brightness Enhancement Film: BEF (registered trademark)) are used in various optical devices (e.g., display devices and lighting devices).
- the term "optical sheet” is not limited to the above examples, but broadly includes sheet-like optical members, and further includes, for example, diffusion plates and light guide plates.
- Optical sheets are attached to other optical sheets or optical devices using, for example, an adhesive layer.
- the term “optical laminate” refers to a configuration including an optical sheet and an adhesive layer or a configuration including a plurality of optical sheets.
- the term “adhesive” is used to include pressure-sensitive adhesives (also referred to as "pressure-sensitive adhesives").
- Patent Document 1 discloses in Patent Document 1 an optical laminate (referred to as an "optical laminate sheet” in Patent Document 1) that can be used in display devices and lighting devices.
- the optical laminate of Patent Document 1 has an optical sheet (for example, a microlens sheet) having an uneven structure on its surface, and an adhesive layer provided on the surface having an uneven structure. 5% to 90% of the height of the projections of the uneven structure is filled with the adhesive layer.
- the adhesive layer is formed from an adhesive composition containing a graft polymer obtained by graft-polymerizing a chain containing a cyclic ether group-containing monomer to a (meth)acrylic polymer and a photocationic polymerization initiator or a thermosetting catalyst.
- Patent Documents 2 and 3 disclose a light distribution structure that utilizes total reflection at interfaces of a plurality of air cavities and that can be used in display devices and lighting devices. By using the light distribution structures disclosed in Patent Documents 2 and 3, the degree of freedom and accuracy of light distribution control can be improved.
- the extent to which the adhesive layer penetrates into (fills in) the recesses of the uneven structure affects the function of the optical sheet. Therefore, the extent to which the adhesive layer penetrates into the recesses of the uneven structure (the ratio of the volume of the adhesive layer existing in the space defined by the recesses of the uneven structure to the volume of the space defined by the recesses of the uneven structure) does not change over time. It is required that they do not change in actual use environments such as high-temperature, high-humidity, and high-temperature and high-humidity environments. According to the studies of the present inventors, the conventional adhesive layer may not be sufficiently inhibited from changing over time to the extent that it penetrates into the concave portions of the concave-convex structure.
- the present invention has been made to solve the above problems, and when it is attached to a surface having an uneven structure (for example, a surface having an uneven structure of an optical sheet), it is good for the surface having an uneven structure.
- Adhesive layer having good adhesiveness and suppressed change over time (including change over time in high temperature and high humidity environment) to the extent that it penetrates into recesses of uneven structure, and an optical laminate having such an adhesive layer intended to provide
- the cross-linking agent includes an isocyanate-based cross-linking agent.
- the isocyanate-based cross-linking agent includes an aliphatic isocyanate-based cross-linking agent.
- the creep deformation rate is 10% or less when a stress of 10,000 Pa is applied at 50 ° C. for 1 second, and a stress of 10,000 Pa is applied at 50 ° C. for 30 minutes.
- a first optical sheet having a first main surface having an uneven structure and a second main surface opposite to the first main surface; and an adhesive layer according to any one of items 1 to 8, disposed on the first main surface side of the first optical sheet, The optical layered body, wherein the concave-convex structure includes a flat portion in contact with the adhesive layer.
- the optical laminate according to item 9 further comprising a second optical sheet disposed on the side of the adhesive layer opposite to the first optical sheet.
- a surface having an uneven structure for example, a surface having an uneven structure of an optical sheet
- it when it is attached to a surface having an uneven structure (for example, a surface having an uneven structure of an optical sheet), it has good adhesion to the surface having an uneven structure, and has unevenness.
- an adhesive layer that is suppressed from changing over time to the extent that it penetrates into recesses in the structure, and an optical laminate having such an adhesive layer.
- FIG. 1 is a schematic cross-sectional view of an optical layered body 100A according to an embodiment of the present invention
- FIG. FIG. 10 is a schematic cross-sectional view of an optical layered body 101A according to another embodiment of the present invention
- FIG. 10 is a schematic cross-sectional view of an optical layered body 102A according to still another embodiment of the present invention
- FIG. 10 is a schematic cross-sectional view of an optical layered body 100B and an optical layered body 101B according to still another embodiment of the present invention
- 4 is a schematic perspective view of a first optical sheet 10b included in the optical layered body 100B.
- FIG. FIG. 3 is a schematic cross-sectional view of a lighting device 200 including an optical layered body 100B
- FIG. 3 is a schematic plan view of a shaped film 70 included in the optical layered body according to the embodiment of the present invention
- FIG. 3 is a schematic cross-sectional view of a shaping film 70;
- the adhesive layer according to an embodiment of the present invention is selected from the group consisting of a polyester resin that is a copolymer of polyhydric carboxylic acid and polyhydric alcohol, a cross-linking agent, an organic zirconium compound, an organic iron compound and an organic aluminum compound. It is formed by cross-linking an adhesive composition containing at least one cross-linking catalyst and a PMMA film having a gel fraction of 40% or more after being held at a temperature of 85 ° C. and a relative humidity of 85% for 300 hours.
- the 180° peel adhesive strength against is 100 mN/20 mm or more.
- the adhesive layer according to the embodiment of the present invention can be applied, for example, to the uneven surface of the optical sheet, and used to attach the optical sheet to another optical sheet, optical member, or optical device.
- a light guide layer and/or a direction changing layer having a plurality of spaces can be configured by a shaping film having a plurality of recesses on the surface and an adhesive layer according to an embodiment of the present invention.
- a light guide layer and/or a redirecting layer having multiple spaces (internal spaces) can function as a light distribution control structure.
- the adhesive layer according to the embodiment of the present invention is not limited to a surface having an uneven structure, and can be attached to a flat surface. For example, it can be attached to the flat surface of an optical sheet and used to attach the optical sheet to another optical sheet, an optical member, or an optical device.
- the present inventors found that by cross-linking an adhesive composition containing a polyester resin, a cross-linking agent, and a cross-linking catalyst, when the adhesive composition is adhered to a surface having an uneven structure, it has a good adhesion to the surface having an uneven structure. While having adhesiveness, the extent to which it penetrates into the recesses of the uneven structure (ratio of the volume of the adhesive layer existing in the space to the volume of the space defined by the recesses of the uneven structure) changes over time, especially at high temperatures The present inventors have found that an adhesive layer can be obtained in which deterioration over time in a humid environment is suppressed.
- the extent to which the adhesive layer penetrates into the recesses of the uneven structure is, for example, the depth of the recess, the adhesion It can be evaluated quantitatively by the ratio of the height of the adhesive layer that has penetrated into the recesses (the regions defined by the recesses) from the adhesive surface between the agent layer and the shaping film (optical sheet).
- the present inventors have found that when an adhesive layer is attached to a surface having an uneven structure, the extent to which the adhesive layer penetrates into the concave portions of the uneven structure changes over time, and the gel fraction of the adhesive layer changes at high temperature and high humidity. It was found that there is a correlation with changes over time in the environment. According to the study of the present inventor, when a conventional adhesive layer formed from a polyester resin is held at a temperature of 85° C. and a relative humidity of 85% for 300 hours, hydrolysis of the ester bonds occurs, and the gel fraction is reduced to almost zero. often declining. Such an adhesive layer was not sufficiently inhibited from changing over time to the extent that it penetrated into the concave portions of the uneven structure.
- the adhesive layer according to the embodiment of the present invention has a gel fraction of 40% or more after being held at a temperature of 85° C. and a relative humidity of 85% for 300 hours.
- the gel fraction after holding the adhesive layer at a temperature of 85° C. and a relative humidity of 85% for 300 hours may be, for example, 55% or more, 60% or more, 65% or more, or 70% or more.
- the gel fraction immediately after the adhesive layer according to the embodiment of the present invention is attached to a surface having an uneven structure is preferably, for example, 50% or more.
- the gel fraction after holding the adhesive layer according to the embodiment of the present invention at a temperature of 85 ° C. and a relative humidity of 85% for 300 hours is the same as the gel fraction immediately after the adhesive layer is attached to the surface having an uneven structure. It is about the same, or even if it decreases, it maintains a gel fraction of 40% or more.
- the adhesive layer according to the embodiment of the present invention when attached to a surface having an uneven structure, is suppressed from penetrating into the recesses of the uneven structure, and Temporal change to the degree of intrusion (including temporal change in a hot and humid environment) is suppressed.
- an adhesive composition in which the adhesive layer according to an embodiment of the present invention comprises a polyester resin, a cross-linking agent, and at least one cross-linking catalyst selected from the group consisting of an organic zirconium compound, an organic iron compound and an organic aluminum compound.
- the adhesive layer according to an embodiment of the present invention has a characteristic crosslinked structure formed by crosslinking an adhesive composition containing a polyester resin, a crosslinking agent, and a crosslinking catalyst. It is conceivable that hydrolysis of the bond is suppressed.
- the change over time to the extent that the adhesive layer according to the embodiment of the present invention penetrates into the concave portions of the concave-convex structure is smaller as the temperature and/or humidity are lower. For example, under normal temperature and normal humidity environment, it is further suppressed than under high temperature and high humidity environment.
- the adhesive layer according to the embodiment of the present invention has a 180° peel adhesive strength to a PMMA film of 100 mN/20 mm or more, and thus has good adhesiveness to a surface having an uneven structure.
- the 180° peel adhesion of the adhesive layer to the PMMA film may be, for example, 500 mN/20 mm or more.
- the 180° peel adhesive strength of the adhesive layer to the PMMA film can be measured, for example, by the method of measuring the 180° peel adhesive strength of the adhesive layer to the PMMA film in Examples described later.
- the thickness of the adhesive layer according to the embodiment of the present invention is not particularly limited, and can be appropriately set depending on the form and application.
- the thickness of the adhesive layer is, for example, 3 ⁇ m or more, 4 ⁇ m or more, or 5 ⁇ m or more, and is, for example, 20 ⁇ m or less, 15 ⁇ m or less, or 10 ⁇ m or less.
- the degree of penetration into recesses and its change over time when an adhesive layer is attached to a surface having a recessed and recessed structure of an optical sheet is determined by the adhesive.
- the creep deformation rate of the layer There is a correlation between the creep deformation rate of the layer. Specifically, in a creep test using a rotational rheometer, the creep deformation rate (sometimes referred to as "creep deformation rate A") when a stress of 10,000 Pa is applied at 50 ° C. for 1 second is 10% or less.
- the adhesive layer according to the embodiment of the present invention may have the creep deformation rate described in WO 2021/167090 above. That is, the adhesive layer according to the embodiment of the present invention has a creep deformation rate of 10% or less when a stress of 10,000 Pa is applied at 50° C. for 1 second in a creep test using a rotary rheometer, and In a creep test using a rotational rheometer, the creep deformation rate may be 16% or less when a stress of 10,000 Pa is applied at 50° C. for 30 minutes.
- the creep strain rate can be measured by the measuring method described in the examples below.
- the creep deformation rate A of the adhesive layer according to an embodiment of the present invention is, for example, 10% or less, 9% or less, 8% or less, 7% or less, 6% or less, 5% or less, or 2% or less, and creep
- the deformation rate B is, for example, 16% or less, 15% or less, 14% or less, 13% or less, 12% or less, 11% or less, 10% or less, or 3% or less.
- the lower limits of the creep deformation ratios A and B are not particularly limited, they are greater than 0, for example.
- an adhesive composition further comprising a cross-linking catalyst in addition to a polyester resin and a cross-linking agent
- the present inventors found that the change over time to the extent that it penetrates into the recesses of the uneven structure, especially in a hot and humid environment. It has been found that the effect of suppressing changes in the environment can be increased.
- composition of the adhesive layer according to the embodiment of the present invention will be described below.
- polyvalent carboxylic acids include aromatic dicarboxylic acids such as terephthalic acid, isophthalic acid, benzylmalonic acid, diphenic acid, 4,4'-oxydibenzoic acid, and naphthalene dicarboxylic acid; Malonic acid, dimethylmalonic acid, succinic acid, glutaric acid, adipic acid, trimethyladipic acid, pimelic acid, 2,2-dimethylglutaric acid, azelaic acid, sebacic acid, fumaric acid, maleic acid, itaconic acid, thiodipropionic acid , aliphatic dicarboxylic acids such as diglycolic acid; Alicyclic groups such as 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1,3-cyclopentanedicarboxylic acid, 1,4-cyclohexanedicarboxylic acid, 2,5-n
- an aromatic dicarboxylic acid from the viewpoint of imparting cohesive force, it is preferable to contain an aromatic dicarboxylic acid, and it is particularly preferable to contain terephthalic acid or isophthalic acid.
- polyhydric alcohols include Ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, 1,3-propanediol, 2,4-dimethyl-2-ethylhexane-1,3-diol, 2-methyl-1,3-propanediol , 2,2-dimethyl-1,3-propanediol (neopentyl glycol), 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 1 ,3-butanediol, 1,4-butanediol, 1,5-pentanediol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2,2,4-trimethyl-1,6- Aliphatic diols such as hexane
- it preferably contains an aliphatic diol or an alicyclic diol, and more preferably contains polytetramethylene glycol, neopentyl glycol or cyclohexanedimethanol.
- the cross-linking agent is not particularly limited, and known ones can be used. Oxazoline compounds, polyfunctional aziridine compounds, metal chelate compounds, and the like can be used. In particular, it is preferable to use an isocyanate-based cross-linking agent from the viewpoint of obtaining the transparency of the adhesive layer to be obtained and the elastic modulus suitable for the adhesive layer.
- An isocyanate-based cross-linking agent refers to a compound having two or more isocyanate groups (including isocyanate-regenerative functional groups in which isocyanate groups are temporarily protected by blocking agents or quantization) in one molecule.
- isocyanate-based cross-linking agents examples include aromatic isocyanates such as tolylene diisocyanate and xylene diisocyanate, alicyclic isocyanates such as isophorone diisocyanate, and aliphatic isocyanates such as hexamethylene diisocyanate.
- lower aliphatic polyisocyanates such as butylene diisocyanate and hexamethylene diisocyanate
- alicyclic isocyanates such as cyclopentylene diisocyanate, cyclohexylene diisocyanate and isophorone diisocyanate
- 2,4-tolylene diisocyanate Aromatic diisocyanates such as 4,4′-diphenylmethane diisocyanate, xylylene diisocyanate, polymethylene polyphenyl isocyanate, trimethylolpropane/tolylene diisocyanate trimer adduct (manufactured by Tosoh Corporation, trade name Coronate L), trimethylol Propane/hexamethylene diisocyanate trimer adduct (manufactured by Tosoh Corporation, trade name Coronate HL), isocyanate adducts such as hexamethylene diisocyanate isocyanur
- the isocyanate-based cross-linking agents may be used singly or in combination of two or more.
- the lower limit of the amount of the isocyanate-based cross-linking agent is 6 parts by mass or more, preferably 7 parts by mass or more, 8 parts by mass or more, 9 parts by mass or more, or 10 parts by mass or more with respect to 100 parts by mass of the polyester resin.
- the upper limit of the amount of the system crosslinking agent is 20 parts by mass or less, preferably 15 parts by mass or less. Within this range, it is possible to prevent the adhesive layer from penetrating into the recesses of the uneven structure over time while maintaining good adhesion to the surface having the uneven structure.
- Organic aluminum compounds include aluminum trisacetylacetonate, aluminum trisethylacetoacetate, diisopropoxyaluminumethylacetoacetate and the like.
- organic iron compounds examples include acetylacetone-iron complexes.
- organic zirconium compounds examples include zirconium tetraacetylacetonate.
- the cross-linking speed can be increased and the production lead time can be shortened.
- an adhesive composition layer is formed by applying (coating) an adhesive composition (or a solution containing the adhesive composition) onto a support (substrate) and drying if necessary.
- an adhesive composition solution layer is formed on a substrate by applying an adhesive composition solution containing a polyester resin, a cross-linking agent, a cross-linking catalyst, and a solvent onto the substrate, and the adhesive composition is An adhesive composition layer is obtained by removing the solvent of the product solution layer.
- the adhesive composition layer is subjected to cross-linking treatment (for example, heat treatment) to cross-link the polyester resin of the adhesive composition layer with a cross-linking agent, thereby forming an adhesive layer having a cross-linked structure.
- cross-linking treatment for example, heat treatment
- an adhesive layer is formed on the substrate, and a laminate having the substrate and the adhesive layer is obtained.
- a substrate a substrate having a release-treated major surface, such as a release liner, may be used.
- the adhesive layer formed on the release liner by the above method may be transferred (transferred) onto a support (or another release liner).
- the support is not particularly limited, and known ones can be used.
- it may be a plastic film or a porous material.
- the support may be, for example, the second optical sheet of the optical layered body of the present invention (for example, the second optical sheet 30 of the optical layered body 101A shown in FIG. 2 described later).
- the support may optionally contain various substances commonly used in adhesive tape substrates (substrates), such as ultraviolet absorbers, light stabilizers, antioxidants, fillers, pigments and dyes. Additives can be used.
- the surface of the support (substrate) can be subjected to a conventional surface treatment, if necessary, in order to improve the adhesion with the adhesive layer, for example, chromic acid treatment, ozone exposure, flame exposure, high-voltage shock. It may be oxidized by chemical or physical methods such as exposure and ionizing radiation treatment, or may be coated with a primer.
- the main surface of the support (base material) on the side of the adhesive layer is coated with a release agent or the like. may be subjected to coating treatment (peeling treatment).
- the release agent is not particularly limited, but examples thereof include silicone-based release agents, fluorine-based release agents, long-chain alkyl-based release agents, and fatty acid amide-based release agents.
- the thickness of the support (base material) can be appropriately selected according to its material and form.
- the release liner is not particularly limited, and known ones can be used as appropriate.
- a substrate substrate for release liner
- the substrate for release liner may be of either a single layer or multiple layers.
- the substrate for the release liner various thin sheets such as plastic films, paper, foams, and metal foils can be used, and plastic films are particularly preferred.
- raw materials for plastic films include polyesters such as polyethylene terephthalate, polyolefins such as polypropylene and ethylene-propylene copolymers, and thermoplastic resins such as polyvinyl chloride.
- the thickness of the release liner substrate can be appropriately selected according to the purpose.
- a known method for applying the adhesive composition (or adhesive composition solution) onto the substrate a known method can be adopted. Examples thereof include roll coating, gravure coating, reverse roll coating, roll brush coating, air knife coating, spray coating, and extrusion coating using a die coater.
- FIG. 1 shows a schematic cross-sectional view of an optical layered body 100A according to an embodiment of the present invention.
- the optical layered body 100A includes a first optical sheet (a first optical sheet ( Here, it has a prism sheet 10a and an adhesive layer 20a arranged on the first main surface 12s side of the first optical sheet 10a.
- Adhesive layer 20a is the adhesive layer according to the embodiments of the invention described above. That is, the adhesive layer 20a is composed of at least one compound selected from the group consisting of a polyester resin that is a copolymer of a polyhydric carboxylic acid and a polyhydric alcohol, a cross-linking agent, and an organic zirconium compound, an organic iron compound, and an organic aluminum compound.
- the 180° peel adhesive strength is 100 mN/20 mm or more.
- the adhesive layer 20a is in contact with the first major surface 12s of the first optical sheet 10a.
- the surface of the adhesive layer 20a is in contact only with the tips of the convex portions of the concave-convex structure of the first main surface 12s of the first optical sheet 10a, and the adhesive layer 20a exists in the concave portions.
- the adhesive layer 20a is not limited to this, and the adhesive layer 20a is formed so as to fill a part of the concave portion of the concave-convex structure of the first main surface 12s of the first optical sheet 10a (a part of the adhesive layer 20a is uneven). (so as to reside within a recess of the structure).
- the first optical sheet 10a is not limited to a prism sheet, and may be another optical sheet (for example, a microlens sheet).
- the pitch P, height H and apex angle ⁇ of the concave-convex structure of the first main surface 12s can be appropriately set according to, for example, the form and application of the optical layered body.
- the optical layered body 100A is manufactured by attaching the adhesive layer 20a formed by the above method to the surface 12s having the concave-convex structure of the first optical sheet 10a using, for example, a roll-to-roll method. can be done. From the viewpoint of mass productivity, it is preferable to manufacture the optical layered body 100A by a roll-to-roll method.
- FIG. 2 shows a schematic cross-sectional view of an optical layered body 101A according to an embodiment of the present invention.
- the optical layered body 101A has an optical layered body 100A and a second optical sheet 30 arranged on the opposite side of the adhesive layer 20a from the first optical sheet 10a side.
- the second optical sheet 30 has a principal surface 38s on the side of the adhesive layer 20a and a principal surface 32s opposite to the principal surface 38s. 38 s of main surfaces are flat surfaces. Any appropriate material can be adopted for the second optical sheet 30 depending on the purpose.
- Materials for the second optical sheet 30 include, for example, thermoplastic resins having optical transparency, and more specifically, for example, (meth)acrylic resins such as polymethyl methacrylate (PMMA), or polycarbonates.
- PMMA polymethyl methacrylate
- PC polycarbonates
- the optical layered body 101A for example, a first layered body in which the first optical sheet 10a and the adhesive layer 20a are laminated is produced, and the first layered body and the second optical sheet 30 are laminated by, for example, a roll-to-roll method. It is produced by pasting together.
- the optical laminate 101A is produced by forming a second laminate in which the second optical sheet 30 and the adhesive layer 20a are laminated, and the second laminate and the first optical sheet 10a are laminated by, for example, a roll-to-roll method. It may be produced by laminating.
- FIG. 3 shows a schematic cross-sectional view of an optical layered body 102A according to an embodiment of the present invention.
- the optical laminate 102A includes an optical laminate 101A and a third optical sheet 40 disposed on the side opposite to the adhesive layer 20a of the second optical sheet 30 of the optical laminate 101A.
- the third optical sheet 40 is arranged, for example, on the main surface 32s of the second optical sheet 30 opposite to the adhesive layer 20a side, with the adhesive layer 50 interposed therebetween.
- Adhesive layer 50 is, for example, an adhesive layer according to embodiments of the invention described above.
- the adhesive layer 50 may not be the adhesive layer according to the embodiment, and may be formed using a known optical adhesive.
- the third optical sheet 40 includes, for example, a diffuser plate and a light guide plate. A plurality of third optical sheets 40 may be provided.
- an optical device according to an embodiment of the present invention includes an optical laminate 101A and an optical member disposed on the side of the second optical sheet 30 of the optical laminate 101A opposite to the adhesive layer 20a.
- optical laminates 100B and 101B according to other embodiments of the present invention will be described with reference to FIGS. 4 to 6.
- FIG. Note that the description of the previous embodiment applies to components having substantially the same functions as those of the previous embodiment unless otherwise specified.
- the optical laminate 100B functions as a light distribution structure described in Patent Documents 2 and 3. The entire disclosures of US Pat.
- FIG. 4 is a schematic cross-sectional view of the optical laminates 100B and 101B, showing a state in which the first optical sheet 10b is adhered to the surface 38s of the second optical sheet 30 via the adhesive layer 20b.
- FIG. 5 is a schematic perspective view of an optical sheet 10b included in the optical laminate 100B.
- FIG. 6 is a schematic cross-sectional view of the illumination device 200 including the optical layered body 102B and the light source 60, and schematically shows the trajectory of light rays.
- the optical laminate 100B includes a first optical sheet 10b having a first principal surface 12s having an uneven structure and a second principal surface 18s opposite to the first principal surface 12s, and the first principal surface 12s of the first optical sheet 10b. and an adhesive layer 20b disposed on the side.
- Adhesive layer 20b is the adhesive layer according to the embodiments of the invention described above.
- the optical layered body 101B has an optical layered body 100B and a second optical sheet 30 arranged on the side opposite to the first optical sheet 10b side of the adhesive layer 20b.
- the uneven structure of the first main surface 12s of the first optical sheet 10b includes a plurality of recesses 14, and the surface of the adhesive layer 20b and the first main surface 12s of the first optical sheet 10b are aligned with the plurality of recesses.
- 14 defines a plurality of spaces 14 (indicated by the same reference numerals as the recesses).
- the adhesive layer 20b is an essential component for defining the space 14 of the optical laminate 100B, and is part of the optical laminate 100B.
- the concave-convex structure of the first optical sheet 10b includes flat portions 10s in contact with the adhesive layer 20b.
- the uneven structure includes, for example, a plurality of protrusions 15 each having a trapezoidal cross section. Since the uneven structure has the flat portion 10s in contact with the adhesive layer 20b, the uneven structure of the first optical sheet 10b is more concave than the uneven structure of the prism surface 12s of the prism sheet 10a shown in FIG. It is difficult for the adhesive layer 20b to penetrate. Therefore, by using the adhesive layer described above, it is possible to obtain an optical layered body 100B in which the penetration of the adhesive layer 20b into the plurality of spaces 14 is suppressed and the degree of penetration is suppressed from changing with time. can.
- the first optical sheet 10b can be manufactured by a similar method using a material similar to that of a known prism sheet or microlens sheet.
- the size and shape of the concavo-convex structure of the first optical sheet 10b can be changed as appropriate (for example, Patent Document 3).
- the first optical sheet 10b functions as an optical laminate 100B (light distribution control structure) in which the space 14 is defined only when it is adhered to the adhesive layer 20b. Different from sheet or microlens sheet.
- the second optical sheet 30 is arranged such that its surface 38s is adhered to the surface 22s of the adhesive layer 20b opposite to the first optical sheet 10b.
- Any appropriate material can be adopted as the material forming the second optical sheet 30 depending on the purpose.
- Materials for the second optical sheet 30 include, for example, light-transmitting thermoplastic resins, and more specifically, for example, (meth)acrylic resins such as polymethyl methacrylate (PMMA), polycarbonate (PC), and the like. ) based resin.
- the optical layered body 102 has an optical layered body 100B and a light guide plate 80 provided on the side opposite to the first optical sheet 10b side of the adhesive layer 20b of the optical layered body 100B.
- the light guide plate 80 is adhered to the surface 22s of the adhesive layer 20b on the opposite side of the first optical sheet 10b.
- the light-receiving surface of the light guide plate 80 is arranged so that light from a light source (for example, an LED) 60 is incident thereon.
- Total internal reflection (TIR) is performed at interfaces 16 s and 14 s formed by the space 14 .
- the light beam totally reflected by the interface 14s (the surface 28s of the adhesive layer 20b on the side of the first optical sheet 10b) is guided through the light guide plate 80 and the adhesive layer 20b, and the light beam totally reflected by the slope 16s is The light is emitted to the outside from the surface 18s of the optical layered body 100B.
- the distribution of light rays emitted from the optical layered body 100B (light distribution) can be adjusted.
- the light guide plate 80, the adhesive layer 20b and the first optical sheet 10b have substantially the same refractive index.
- the difference (absolute value) in refractive index between the light guide plate 80 and the adhesive layer 20b and the difference (absolute value) in refractive index between the adhesive layer 20b and the first optical sheet 10b are independently, for example, 0.20 or less. is preferred, 0.15 or less is more preferred, and 0.1 or less is even more preferred.
- a space 14 of the optical laminate 100B is defined by a surface 16s and a surface 17s that are part of the first main surface 12s of the first optical sheet 10b and a surface 28s of the adhesive layer 20b.
- the surface 16s is inclined (more than 0° and less than 90°) with respect to the sheet surface (horizontal direction in the figure) and the surface 17s is substantially perpendicular to the sheet surface is shown. It is not limited and can be modified in various ways (see Patent Documents 2 and 3).
- the cross-sectional shape of the protrusion 15 is trapezoidal is shown, but the shape of the protrusion 15 is not limited to the illustrated one, and can be modified in various ways. By adjusting the shape, size, etc.
- Patent Document 2 describes an example of a laminate having a plurality of spaces inside.
- Another example of the first optical sheet 10b is a shaping film 70 shown in FIGS. 7A and 7B.
- the shaping film 70 has a plurality of concave portions 74 with triangular cross sections on its surface, and the cross-sectional shape of the spaces 74 formed by the concave portions 74 is triangular.
- the plurality of internal spaces 14, 74 included in the light distribution control structure correspond to the plurality of internal spaces 14, 74 occupying the area of the first optical sheet 10b when the first optical sheet 10b is viewed from the normal direction of the main surface.
- (occupied area ratio) is preferably 1% or more from the viewpoint of obtaining good luminance.
- the occupied area ratio of the internal spaces 14 and 74 is appropriately selected depending on the intended use. For example, in applications requiring transparency, it is preferably 1% or more and 10% or less. It is more preferably 30% or more and 80% or less in the application.
- the occupied area ratios of the internal spaces 14 and 74 may be uniform, and in order to prevent the brightness from decreasing even if the distance from the light source (for example, the light source 60 in FIG. 6) increases, The occupied area ratio may be increased.
- the length L is preferably 10 ⁇ m or more and 500 ⁇ m or less
- the width W is preferably 1 ⁇ m or more and 100 ⁇ m or less.
- the height H is preferably 1 ⁇ m or more and 100 ⁇ m or less.
- the plurality of internal spaces 14, 74 are preferably discretely and evenly distributed, and preferably arranged periodically, for example, as shown in FIG. 7A.
- the pitch Px is preferably, for example, 10 ⁇ m or more and 500 ⁇ m or less
- the pitch Py is, for example, preferably 10 ⁇ m or more and 500 ⁇ m or less.
- Example 1 (1) Preparation of polyester resin A A four-necked separable flask was equipped with a stirrer, a thermometer, a nitrogen inlet tube, and a cooling tube with a trap. 45 g of isophthalic acid (molecular weight: 166), and as alcohol components, 115 g of polytetramethylene glycol (molecular weight: 566), 4 g of ethylene glycol (molecular weight: 62), 16 g of neopentyl glycol (molecular weight: 104) and 23 g of cyclohexanedimethanol (molecular weight: 104). : 144), 0.1 g of tetrabutyl titanate was added as a catalyst, and the temperature was raised to 240°C while stirring while filling the flask with nitrogen gas, and the temperature was maintained at 240°C for 4 hours.
- polyester resin A was obtained. Polyester resin A was obtained by polymerizing the above monomers without using a solvent.
- the mass average molecular weight (Mw) of polyester resin A measured by GPC was 59,200.
- the composition and mass average molecular weight (Mw) of the polyester resin used in each experimental example are summarized in Table 1 below.
- the prepared polyester resin A was dissolved in ethyl acetate and removed from the flask to prepare a polyester resin A solution having a solid content concentration of 50% by mass.
- Adhesive Sheet The adhesive composition solution is applied to one side of a 38 ⁇ m thick polyethylene terephthalate (PET) film (trade name “MRF38”, manufactured by Mitsubishi Chemical Corporation) that has been subjected to silicone release treatment, and adhered. An agent composition solution layer was formed. The thickness of the adhesive composition solution layer was such that the thickness of the adhesive layer after the following step of treatment at 40° C. for 3 days was 7 ⁇ m. By drying the adhesive composition solution layer at 150° C. for 1 minute, the solvent in the adhesive composition solution layer was removed to obtain an adhesive composition layer.
- PET polyethylene terephthalate
- the adhesive composition layer was attached to the release-treated surface of a 38 ⁇ m silicone release-treated polyethylene terephthalate (PET) film (trade name “MRE38”, manufactured by Mitsubishi Chemical Corporation) and left at 40° C. for 3 days.
- the adhesive composition layer was treated at 40° C. for 3 days to crosslink the polyester resin A of the adhesive composition layer with a crosslinking agent to form an adhesive layer.
- an adhesive sheet (laminate) having a laminated structure of PET film/adhesive layer/PET film was produced.
- the cross-linking reaction of the polyester resin A may partially occur even in the step of treating the adhesive composition solution layer at 150° C. for 1 minute, but most of the cross-linking reaction occurs in the subsequent step of heat treatment at 40° C. for 3 days.
- "Thickness" in Table 2 is the thickness of the adhesive layer, ie after 3 days of treatment at 40°C.
- unevenness-shaped film was produced according to the method described in JP-T-2013-524288. Specifically, the surface of a polymethyl methacrylate (PMMA) film is coated with lacquer (manufactured by Sanyo Chemical Industries, Ltd., Fine Cure RM-64: acrylate-based photocurable resin), and the film surface containing the lacquer An optical pattern was embossed on the film, and then the lacquer was cured (ultraviolet irradiation conditions: D bulb, 1000 mJ/cm 2 , 320 mW/cm 2 ) to produce the desired irregular shaped film.
- the unevenness-imparting film had a total thickness of 130 ⁇ m and a haze value of 0.8%.
- FIG. 7A shows a plan view of a portion of the manufactured unevenness-shaping film 70 as viewed from the uneven surface side.
- FIG. 7B shows a 7B-7B' cross-sectional view of the concave-convex shaped film of FIG. 7A.
- a plurality of concave portions 74 having a triangular cross section and having a length L of 80 ⁇ m, a width W of 14 ⁇ m, and a depth H of 10 ⁇ m were arranged at intervals of a width E (155 ⁇ m) in the X-axis direction. Furthermore, such a pattern of recesses 74 was arranged at intervals of width D (100 ⁇ m) in the Y-axis direction.
- the density of the concave portions 74 on the concave-convex shaped film surface was 3612/cm 2 .
- Both ⁇ a and ⁇ b in FIG. 7B were 41°, and the occupied area ratio of the concave portions 74 when the film was viewed from the uneven surface side was 4.05%.
- Example 2 Per 100 parts by mass of the solid content of the polyester resin A solution prepared in the same manner as in Example 1, 30 parts by mass of a terpene phenol-based tackifying resin ("YS Polystar T130" manufactured by Yasuhara Chemical Co., Ltd.) was blended as an additive. , to obtain a polyester resin B solution.
- a terpene phenol-based tackifying resin (“YS Polystar T130" manufactured by Yasuhara Chemical Co., Ltd.
- an acetylacetone metal complex iron compound (trade name “Nasem ferric”, manufactured by Nippon Kagaku Sangyo Co., Ltd. as a crosslinking catalyst. “Nasem” is a registered trademark. Hereinafter, “Nasem ) is 0.066 parts by mass, and a trimethylolpropane / tolylene diisocyanate trimer adduct as a cross-linking agent (trade name “Coronate L”, manufactured by Tosoh Corporation. Hereinafter referred to as “Coronate L” 5 parts by mass, and ethyl acetate was further added so that the solid content concentration was 20% by mass, to prepare an adhesive composition solution.
- a trimethylolpropane / tolylene diisocyanate trimer adduct (trade name “Coronate L”, manufactured by Tosoh Corporation.
- Coronate L” 5 parts by mass and ethyl acetate was further added so that the solid content concentration was 20% by mass, to prepare an adhesive composition
- An adhesive sheet and an optical laminate were produced in the same manner as in Example 1, except that the adhesive composition solution was prepared as described above. However, the thickness of the adhesive layer was adjusted to the value shown in Table 2.
- Example 3 Solid content of polyester resin C containing aromatic dicarboxylic acid, aliphatic dicarboxylic acid and aliphatic diol as monomer components (Mitsubishi Chemical Corporation "Nichigo Polyester NP-110S50EO", “Nichigo Polyester” is a registered trademark.)
- zirconium tetraacetylacetonate (trade name "Orgatics ZC-700", manufactured by Matsumoto Fine Chemical Co., Ltd., hereinafter sometimes referred to as "ZC-700) as a crosslinking catalyst is 0.02.
- An adhesive sheet and an optical laminate were produced in the same manner as in Example 1, except that the adhesive composition solution was prepared as described above. However, the thickness of the adhesive layer was adjusted to the value shown in Table 2.
- Polyester resin D containing aromatic dicarboxylic acid, aliphatic dicarboxylic acid and aliphatic diol as monomer components (“Vylon 550” manufactured by Toyobo Co., Ltd., "Vylon” is a registered trademark.)
- Per 100 parts by mass of solid content 0.07 parts by mass of zirconium tetraacetylacetonate (trade name “Orgatics ZC-162”, manufactured by Matsumoto Fine Chemical Co., Ltd.) as a cross-linking catalyst, and a trimethylolpropane/tolylene diisocyanate trimer adduct (trade name 3 parts by mass of "Coronate L” manufactured by Tosoh Corporation) was blended, and ethyl acetate was further added so that the solid content concentration was 20% by mass to prepare an adhesive composition solution.
- the component composition of polyester resin D is shown in Table 1.
- An adhesive sheet and an optical laminate were produced in the same manner as in Example 1, except that the adhesive composition solution was prepared as described above. However, the thickness of the adhesive layer was adjusted to the value shown in Table 2.
- Polyester resin C containing aromatic dicarboxylic acid, aliphatic dicarboxylic acid and aliphatic diol as monomer components (manufactured by Mitsubishi Chemical Corporation "Nichigo Polyester NP-110S50EO”) for 100 parts by mass of solid content, as a crosslinking catalyst 0.02 parts by mass of zirconium tetraacetylacetonate (trade name “Orgatics ZC-700”, manufactured by Matsumoto Fine Chemicals Co., Ltd.), and an isocyanurate of hexamethylene diisocyanate as a cross-linking agent (trade name “Coronate HX”, Tosoh Corporation 10 parts by mass of the adhesive composition (manufactured by Ajinomoto Co.), and ethyl acetate was further added so that the solid content concentration was 20% by mass, to prepare an adhesive composition solution.
- An adhesive sheet and an optical laminate were produced in the same manner as in Example 1, except that the adhesive composition solution was prepared as described above. However, the thickness of the adhesive layer was adjusted to the value shown in Table 2.
- An adhesive sheet and an optical laminate were produced in the same manner as in Example 1, except that the adhesive composition solution was prepared as described above. However, the thickness of the adhesive layer was adjusted to the value shown in Table 2.
- polyester resin Table 1 shows the compositions and mass average molecular weights (Mw) of the polyester resins A to D used in Examples 1 to 3 and Comparative Examples 1 to 3.
- the mass average molecular weight (Mw) of polyester resins A to D was determined by GPC.
- evaluation method The evaluation method for each evaluation item is as follows. Table 2 shows the evaluation results.
- PET film (trade name “Lumirror S-10” manufactured by Toray Industries, Inc.) to obtain a test piece.
- the test piece was cut to a width of 20 mm, the other peeled PET film was peeled off, and the surface of the exposed adhesive layer was coated with a polymethyl methacrylate (PMMA) plate (thickness 2 mm, trade name “Acrylite”). , manufactured by Mitsubishi Chemical Corporation) to prepare a test piece, and the adhesive strength (mN/20 mm) to the PMMA plate was measured.
- PMMA polymethyl methacrylate
- the pressure bonding when bonding to the PMMA plate is performed by reciprocating a 2 kg roller once, and after 30 minutes of bonding, using a tension compression tester (device name "AGS-50NX", manufactured by Shimadzu Corporation), The 180° peel adhesion was measured under the following conditions.
- a 180° peel adhesive strength of 100 mN/20 mm or more was evaluated as “good (good)”, and a 180° peel adhesive strength of less than 100 mN/20 mm was evaluated as “x (NG)”.
- Peeling speed 300 mm/min Measurement conditions: temperature: 23 ⁇ 2° C., humidity: 65 ⁇ 5% RH
- the obtained gel fraction was judged according to the following criteria. ⁇ (Excellent): 70% or more ⁇ (Good): 40% or more and less than 70% ⁇ (NG): less than 40%
- the cut test piece was embedded in a block of resin (manufactured by ITW Performance Polymers & Fluids Japan Co., Ltd., S-31), and the sample temperature was stabilized at -80 ° C. so as not to cause shape change.
- a cross-sectional observation sample was prepared with a microtome. The sample was observed with a laser microscope (manufactured by Keyence Corporation, VK-X1000, 1100) to measure the height of the adhesive layer in the concave portion 74 . The height of the adhesive layer was judged according to the following criteria. ⁇ (Excellent): 1 ⁇ m or less ⁇ (Good): More than 1 ⁇ m and less than 2 ⁇ m ⁇ (NG): More than 2 ⁇ m
- Table 2 also shows the ratio (%) of the height of the adhesive layer existing in the recess 74 with respect to the depth H (10 ⁇ m) of the recess 74 .
- the ratio of the height of the adhesive layer existing within the recess 74 to the depth H of the recess 74 was determined according to the following criteria. ⁇ (Excellent): 10% or less ⁇ (Good): More than 10% and 20% or less ⁇ (NG): More than 20%
- the adhesive layer ( A laminate of adhesive layers (thickness: 1 mm, size: 4 cm x 6 cm) was obtained by laminating 100 adhesive layers in total. A cylinder having a diameter of 8 mm (height of 1 mm) was punched out from the adhesive layer laminate (thickness of 1 mm) obtained as described above to prepare a test piece. A stress of 10,000 Pa is applied to the test piece for 30 minutes at a measurement temperature of 50 ° C. using a viscoelasticity measuring device (device name “ARES G-2”, manufactured by TA Instruments Japan Co., Ltd.). Then, the deformation rate was measured after 1 second and 30 minutes.
- a viscoelasticity measuring device device name “ARES G-2”, manufactured by TA Instruments Japan Co., Ltd.
- the "creep deformation rate" of the adhesive layer is the “creep deformation rate” obtained by the above method using a laminate (thickness of 1 mm) of the adhesive layer.
- the creep deformation rate of a laminate with a thickness of 1 mm is as follows: a laminate formed by laminating 20 adhesive layers with a thickness of 50 ⁇ m No significant difference was observed between the laminate formed by laminating 100 layers and the laminate formed by laminating 200 adhesive layers with a thickness of 5 ⁇ m.
- the creep deformation rate of a laminate having a thickness of 1 mm does not depend on the thickness of the adhesive layer, provided that the thickness of each adhesive layer constituting the laminate is in the range of at least 5 ⁇ m to 50 ⁇ m. According to the study of the present inventors, if the thickness of each adhesive layer is 0.1 ⁇ m or more, the creep deformation rate of the laminate having a thickness of 1 mm is considered to take a substantially constant value.
- All of the adhesive layers of Examples 1 to 3 have a 180° peel adhesive force to the PMMA film of 100 mN/20 mm or more, so they have good adhesiveness.
- the adhesive layers of Examples 1 and 2 are particularly excellent in adhesiveness.
- the 180° peel adhesive strength of the adhesive layer to the PMMA film is preferably, for example, 600 mN/20 mm or more, and more preferably, for example, 1000 mN/20 mm or more.
- the height of the adhesive layer that penetrated into the concave portions of the optical sheet was 0 after being held for 6 hours under normal temperature and normal humidity. .1 ⁇ m or less, and was suppressed to 0.3 ⁇ m or less even after being held at a temperature of 85° C. and a relative humidity of 85% for 300 hours.
- all of the adhesive layers of Examples 1 to 3 had a thickness of 6 in a normal temperature and normal humidity environment.
- All of the adhesive layers of Examples 1 to 3 had a gel fraction of 40% or more after being held at a temperature of 85° C. and a relative humidity of 85% for 300 hours, and the degree of penetration into the recesses in a high temperature and high humidity environment. was suppressed.
- the adhesive layers of Comparative Examples 1 and 3 had a gel fraction of less than 40% (26% or less) after being held at a temperature of 85° C. and a relative humidity of 85% for 300 hours. The change over time in the degree of penetration into the concave portion was not sufficiently suppressed. The gel fraction after holding the adhesive layer at a temperature of 85 ° C.
- the gel fraction after holding the adhesive layer at a temperature of 85° C. and a relative humidity of 85% for 300 hours is, for example, preferably 55% or more, and more preferably 65% or more. More preferably, it is, for example, 85% or more.
- All of the adhesive layers of Examples 1 to 3 had a creep deformation rate (creep deformation rate A) of 10% when a stress of 10,000 Pa was applied at 50°C for 1 second in a creep test using a rotary rheometer. and a creep deformation rate (creep deformation rate B) when a stress of 10,000 Pa is applied at 50° C. for 30 minutes in a creep test using a rotary rheometer is 16% or less.
- all of the adhesive layers of Examples 1 to 3 are inhibited from penetrating into the concave portions of the optical sheet and from changing over time in the normal temperature and normal humidity environment and in the high temperature and high humidity environment.
- the creep deformation rate of the adhesive layer may be, for example, a creep deformation rate A of 2% or less and a creep deformation rate B of 3% or less.
- the adhesive layers of Comparative Examples 1 to 3 were not measured for creep deformation rate.
- the adhesive layers of Comparative Examples 1 and 3 the height of the adhesive layer in the recesses after the high-temperature and high-humidity endurance test is large, and the optical sheet (unevenness-shaping film) in the high-temperature and high-humidity environment. invasion was not sufficiently suppressed.
- the adhesive layers of Comparative Examples 1 and 3 had low gel fractions of 0% and 26%, respectively, after holding at a temperature of 85° C. and a relative humidity of 85% for 300 hours.
- the adhesive layer of Comparative Example 3 formed without using a cross-linking catalyst has a cross-linking treatment step (a step of treating at 40 ° C. for 3 days) compared to the adhesive layers of Examples 1 to 3 using a cross-linking catalyst. ), the polyester resin was not sufficiently crosslinked, and the hydrolysis of the ester bond was not sufficiently suppressed.
- the adhesive layer of Comparative Example 2 suppresses penetration into the concave portions of the optical sheet (concavo-convex forming film) in a high-temperature and high-humidity environment, and the gel content after holding for 300 hours at a temperature of 85° C. and a relative humidity of 85%. Although the rate was maintained as high as 94%, the 180° peel adhesive strength to the PMMA film was 80 mN/20 mm or more, indicating insufficient adhesion.
- the adhesive layer and optical laminate of the present invention are widely used in optical devices such as display devices and lighting devices.
Abstract
Description
多価カルボン酸と多価アルコールの共重合体であるポリエステル樹脂と、架橋剤と、有機ジルコニウム化合物、有機鉄化合物および有機アルミニウム化合物からなる群から選択される少なくとも1つの架橋触媒とを含む接着剤組成物を架橋させることによって形成されており、
温度85℃かつ相対湿度85%で300時間保持した後のゲル分率が40%以上であり、
PMMAフィルムに対する180°ピール接着力が100mN/20mm以上である、接着剤層。
[項目2]
前記多価カルボン酸は、芳香族ジカルボン酸を含む、項目1に記載の接着剤層。
[項目3]
前記多価アルコールは、脂肪族ジオールまたは脂環族ジオールを含む、項目1または2に記載の接着剤層。
[項目4]
前記架橋剤は、イソシアネート系架橋剤を含む、項目1から3のいずれか1つに記載の接着剤層。
[項目5]
前記イソシアネート系架橋剤は、脂肪族イソシアネート系架橋剤を含む、項目4に記載の接着剤層。
[項目6]
厚さが3μm以上20μm以下である、項目1から5のいずれか1つに記載の接着剤層。
[項目7]
温度85℃かつ相対湿度85%で300時間保持した後のゲル分率が55%以上である、項目1から6のいずれか1つに記載の接着剤層。
[項目8]
回転式レオメータを用いたクリープ試験において、50℃で10,000Paの応力を1秒間印加したときのクリープ変形率が10%以下であり、かつ、50℃で10,000Paの応力を30分間印加したときのクリープ変形率が16%以下である、項目1から7のいずれか1つに記載の接着剤層。
[項目9]
凹凸構造を有する第1主面および前記第1主面と反対側の第2主面を有する第1光学シートと、
前記第1光学シートの前記第1主面側に配置された、項目1から8のいずれか1つに記載の接着剤層と
を有し、
前記凹凸構造は、前記接着剤層と接する平坦部を含む、光学積層体。
[項目10]
前記接着剤層の前記第1光学シートと反対側に配置された第2光学シートをさらに有する、項目9に記載の光学積層体。
まず、本発明の実施形態による接着剤層について説明する。本発明の実施形態は、以下で例示するものに限定されない。
多価カルボン酸としては、例えば、
テレフタル酸、イソフタル酸、ベンジルマロン酸、ジフェン酸、4,4′-オキシジ安息香酸、ナフタレンジカルボン酸等の芳香族ジカルボン酸;
マロン酸、ジメチルマロン酸、コハク酸、グルタル酸、アジピン酸、トリメチルアジピン酸、ピメリン酸、2,2-ジメチルグルタル酸、アゼライン酸、セバシン酸、フマル酸、マレイン酸、イタコン酸、チオジプロピオン酸、ジグリコール酸等の脂肪族ジカルボン酸;
1,3-シクロペンタンジカルボン酸、1,2-シクロヘキサンジカルボン酸、1,3-シクロペンタンジカルボン酸、1,4-シクロヘキサンジカルボン酸、2,5-ノルボルナンジカルボン酸、アダマンタンジカルボン酸等の脂環族ジカルボン酸;
などが挙げられる。これらは単独でもしくは2種以上併せて用いることができる。
多価アルコールとしては、例えば、
エチレングリコール、ジエチレングリコール、トリエチレングリコール、プロピレングリコール、ジプロピレングリコール、1,3-プロパンジオール、2,4-ジメチル-2-エチルヘキサン-1,3-ジオール、2-メチル-1,3-プロパンジオール、2,2-ジメチル-1,3-プロパンジオール(ネオペンチルグリコール)、2-エチル-2-ブチル-1,3-プロパンジオール、2-エチル-2-イソブチル-1,3-プロパンジオール、1,3-ブタンジオール、1,4-ブタンジオール、1,5-ペンタンジオール、1,6-ヘキサンジオール、3-メチル-1,5-ペンタンジオール、2,2,4-トリメチル-1,6-ヘキサンジオール、ポリテトラメチレングリコールなどの脂肪族ジオール;
1,2-シクロヘキサンジメタノール、1,3-シクロヘキサンジメタノール、1,4-シクロヘキサンジメタノール、スピログリコール、トリシクロデカンジメタノール、アダマンタンジオール、2,2,4,4-テトラメチル-1,3-シクロブタンジオールなどの脂環族ジオール;
4,4′-チオジフェノール、4,4′-メチレンジフェノール、4,4′-ジヒドロキシビフェニル、o-,m-及びp-ジヒドロキシベンゼン、2,5-ナフタレンジオール、p-キシレンジオール及びそれらのエチレンオキサイド、プロピレンオキサイド付加体などの芳香族ジオール;
などが挙げられる。これらは単独でもしくは2種以上併せて用いることができる。
架橋剤としては、特に限定されるものではなく、公知のものを使用することができ、例えば、多価イソシアヌレート、多官能性イソシアネート、多官能性メラミン化合物、多官能性エポキシ化合物、多官能性オキサゾリン化合物、多官能性アジリジン化合物、金属キレート化合物などを用いることができる。特に、得られる接着剤層の透明性や、接着剤層に適した弾性率を得るという観点からは、イソシアネート系架橋剤を用いることが好ましい。
有機アルミニウム化合物としては、アルミニウムトリスアセチルアセトネート、アルミニウムトリスエチルアセトアセテート、ジイソプロポキシアルミニウムエチルアセトアセテートなどが挙げられる。
接着剤層の形成方法としては、公知の方法を採用することができる。たとえば、以下の方法が挙げられる。まず、接着剤組成物(または接着剤組成物を含む溶液)を支持体(基材)上に付与(塗布)し、必要に応じて乾燥させることによって、接着剤組成物層を形成する。典型的には、ポリエステル樹脂と架橋剤と架橋触媒と溶媒とを含む接着剤組成物溶液を基材上に付与することによって、基材上に接着剤組成物溶液層を形成し、接着剤組成物溶液層の溶媒を除去することによって接着剤組成物層を得る。次いで、接着剤組成物層に架橋処理(例えば加熱処理)を施すことによって接着剤組成物層のポリエステル樹脂を架橋剤で架橋させ、架橋構造を有する接着剤層を形成する。このようにして、基材上に接着剤層が形成され、基材と接着剤層とを有する積層体が得られる。基材として、例えば剥離ライナーなどの、剥離処理された主面を有する基材を用いてもよい。上記の方法で剥離ライナー上に形成した接着剤層を支持体(あるいは他の剥離ライナー)上に移着(転写)してもよい。
図面を参照しながら、本発明の実施形態による接着剤層を有する光学積層体を説明する。
(1)ポリエステル樹脂Aの調製
4つ口セパラブルフラスコに攪拌機、温度計、窒素導入管、及びトラップ付き冷却管を取り付け、このフラスコ内に、カルボン酸成分としてテレフタル酸47g(分子量:166)およびイソフタル酸45g(分子量:166)と、アルコール成分として、ポリテトラメチレングリコール115g(分子量:566)、エチレングリコール4g(分子量:62)、ネオペンチルグリコール16g(分子量:104)およびシクロヘキサンジメタノール23g(分子量:144)と、触媒としてテトラブチルチタネート0.1gを投入し、フラスコ内を窒素ガスで満たした状態で撹拌しながら、240℃まで昇温し、240℃で4時間保持した。
上記で調製したポリエステル樹脂A溶液の固形分100質量部に対して、架橋触媒としてジルコニウムテトラアセチルアセトナート(商品名「オルガチックスZC-162」、マツモトファインケミカル株式会社製。「オルガチックス」は登録商標。以下、「ZC-162」と呼ぶことがある。)を0.07質量部、架橋剤としてヘキサメチレンジイソシアネートのイソシアヌレート体(商品名「コロネートHX」、東ソー株式会社製。「コロネート」は登録商標。以下、「コロネートHX」と呼ぶことがある。)を12質量部、触媒反応抑制剤としてアセチルアセトンを20質量部配合して、固形分濃度が20質量%となるように酢酸エチルをさらに加えて、接着剤組成物溶液を調製した。
接着剤組成物溶液を、シリコーン剥離処理した厚さ38μmのポリエチレンテレフタレート(PET)フィルム(商品名「MRF38」、三菱ケミカル株式会社製)の片面に塗布して、接着剤組成物溶液層を形成した。接着剤組成物溶液層の厚さは、下記の40℃で3日間処理する工程の後の接着剤層の厚さが7μmとなるように塗布した。接着剤組成物溶液層を150℃で1分間乾燥させることによって、接着剤組成物溶液層の溶媒を除去し、接着剤組成物層を得た。次いで、シリコーン剥離処理した38μmのポリエチレンテレフタレート(PET)フィルム(商品名「MRE38」、三菱ケミカル株式会社製)の剥離処理面に接着剤組成物層を貼り合わせて、40℃で3日間放置した。接着剤組成物層を40℃で3日間処理することによって、接着剤組成物層のポリエステル樹脂Aを架橋剤で架橋させ、接着剤層を形成した。このようにして、PETフィルム/接着剤層/PETフィルムの積層構造を有する接着剤シート(積層体)を作製した。接着剤組成物溶液層を150℃で1分間処理する工程においてもポリエステル樹脂Aの架橋反応が部分的に生じ得るが、架橋反応の大部分はその後の40℃で3日間加熱処理する工程において生じる。表2の「厚さ」は、接着剤層の厚さ、すなわち、40℃で3日間処理した後の厚さである。
特表2013-524288号公報に記載の方法にしたがって凹凸賦形フィルムを製造した。具体的には、ポリメタクリル酸メチル(PMMA)フィルムの表面をラッカー(三洋化成工業株式会社製、ファインキュアー RM-64:アクリレート系の光硬化性樹脂)でコーティングし、当該ラッカーを含むフィルム表面上に光学パターンをエンボス加工し、その後ラッカーを硬化(紫外線照射条件:Dバルブ、1000mJ/cm2、320mW/cm2)させることによって目的の凹凸賦形フィルムを製造した。凹凸賦形フィルムの総厚さは130μmであり、ヘイズ値は0.8%であった。
上記(3)で得られた接着剤シートから一方の剥離処理されたPETフィルムを剥離し、露出させた接着剤層の表面を、アクリル系樹脂フィルム(厚さ:30μm)に貼り合わせ、さらに他方のセパレータ(PETフィルム)を剥離して、(4)の凹凸賦形フィルムに貼り合わせ、アクリル系樹脂フィルム/接着剤層/凹凸賦形フィルムの積層構造を有する光学積層体を得た。
実施例1と同じように調製したポリエステル樹脂A溶液の固形分100質量部に対して、添加剤としてテルペンフェノール系粘着付与樹脂(ヤスハラケミカル株式会社製「YSポリスターT130」)30質量部を配合して、ポリエステル樹脂B溶液を得た。
芳香族ジカルボン酸、脂肪族ジカルボン酸および脂肪族ジオールをモノマー成分として含有するポリエステル樹脂C(三菱ケミカル株式会社製「ニチゴーポリエスターNP―110S50EO」、「ニチゴーポリエスター」は登録商標。)の固形分100質量部に対して、架橋触媒としてジルコニウムテトラアセチルアセトネート(商品名「オルガチックスZC-700」、マツモトファインケミカル株式会社製。以下、「ZC-700」と呼ぶことがある。)を0.02質量部、架橋剤としてトリメチロールプロパン/トリレンジイソシアネート3量体付加物(商品名「コロネートL」、東ソー株式会社製)1質量部を配合して、固形分濃度が20質量%となるように酢酸エチルをさらに加えて、接着剤組成物溶液を調製した。なおポリエステル樹脂Cの成分組成は表1の通りである。
芳香族ジカルボン酸、脂肪族ジカルボン酸および脂肪族ジオールをモノマー成分として含有するポリエステル樹脂D(東洋紡株式会社製「バイロン550」、「バイロン」は登録商標。)の固形分100質量部に対して、架橋触媒としてジルコニウムテトラアセチルアセトナート(商品名「オルガチックスZC-162」、マツモトファインケミカル株式会社製)を0.07質量部、架橋剤としてトリメチロールプロパン/トリレンジイソシアネート3量体付加物(商品名「コロネートL」、東ソー株式会社製)3質量部を配合して、固形分濃度が20質量%となるように酢酸エチルをさらに加えて、接着剤組成物溶液を調製した。なおポリエステル樹脂Dの成分組成は表1の通りである。
芳香族ジカルボン酸、脂肪族ジカルボン酸および脂肪族ジオールをモノマー成分として含有するポリエステル樹脂C(三菱ケミカル株式会社製「ニチゴーポリエスターNP―110S50EO」)の固形分100質量部に対して、架橋触媒としてジルコニウムテトラアセチルアセトネート(商品名「オルガチックスZC-700」、マツモトファインケミカル株式会社製)を0.02質量部、架橋剤としてヘキサメチレンジイソシアネートのイソシアヌレート体(商品名「コロネートHX」、東ソー株式会社製)10質量部を配合して、固形分濃度が20質量%となるように酢酸エチルをさらに加えて、接着剤組成物溶液を調製した。
ポリエステル樹脂A溶液の固形分100質量部に対して、架橋触媒を使用せず、架橋剤としてヘキサメチレンジイソシアネートのイソシアヌレート体(商品名「コロネートHX」、東ソー株式会社製)2質量部を配合して、固形分濃度が20質量%となるように酢酸エチルをさらに加えて、接着剤組成物溶液を調製した。
実施例1~3および比較例1~3で用いたポリエステル樹脂A~Dの組成および質量平均分子量(Mw)を表1に示す。ポリエステル樹脂A~Dの質量平均分子量(Mw)はGPCで求めた。
各評価項目の評価方法は以下の通りである。評価結果を表2に示す。
実施例1~3および比較例1~3のそれぞれについて、得られた接着剤シートから一方の剥離処理されたPETフィルムを剥離し、露出させた接着剤層の表面を厚さが25μmのポリエチレンテレフタレート(PET)フィルム(商品名「ルミラー S-10」、東レ株式会社製)に貼り合わせて試験片を得た。
引き剥がし速度:300mm/分
測定条件:温度:23±2℃、湿度:65±5%RH
実施例1~3および比較例1~3のそれぞれについて、得られた接着剤シートの接着剤層から約0.1gとり、あらかじめ質量を測定したフッ素樹脂フィルム(TEMISH NTF-1122、日東電工株式会社製)(質量:Wa)に包み、接着剤が漏れないように縛り、測定サンプルとした。測定サンプルの質量を測定し(質量:Wb)、瓶にいれ、酢酸エチルを40cc加えて、7日間放置した。その後、測定サンプルを取り出し、当該測定サンプルを130℃で2時間乾燥させた。乾燥後の測定サンプルの質量を測定し(質量:Wc)、以下の式によりゲル分率を求めた。
ゲル分率[質量%]={(Wc-Wa)/(Wb-Wa)}×100
◎(Excellent):70%以上
○(Good):40%以上70%未満
×(NG):40%未満
実施例1~3および比較例1~3のそれぞれについて、得られた光学積層体の凹凸賦形フィルム70の断面(例えば図7Bに示す断面)を観察し、凹部74内(凹部74によって画定される領域内)に存在する接着剤層の高さを測定した。接着剤層の高さは、凹部74の深さ方向において測定した。具体的には、まず、各実施例および比較例で作製された光学積層体から3mm角のサイズで切り出した。その後、切り出した試験片を樹脂(株式会社ITWパフォーマンスポリマーズ&フルイズジャパン製、S-31)でブロック状に包埋し、形状変化が生じないよう-80℃でサンプル温度を安定させた後、ミクロトームで断面観察サンプルを作製した。当該サンプルをレーザー顕微鏡(株式会社キーエンス製、VK-X1000、1100)で観察して凹部74内の接着剤層の高さを測定した。
接着剤層の高さを以下の基準で判定した。
◎(Excellent):1μm以下
○(Good):1μm超2μm以下
×(NG):2μm超
◎(Excellent):10%以下
○(Good):10%超20%以下
×(NG):20%超
実施例1~3および比較例1~3のそれぞれについて、接着剤層の積層体(厚さ1mm)を以下のように作製した。上記の接着剤シートと同様に、ただし接着剤層の厚さを10μmとして、PETフィルム/接着剤層(厚さ10μm)/PETフィルムの積層構造を有する接着剤シートを幅20cm、長さ30cmのサイズで4個作製した。得られた接着剤シートの接着剤層を複数積層させる工程と、接着剤層の積層体を複数の試験片に分割する(複数の試験片を切り出す)工程とを繰り返すことによって、接着剤層(厚さ10μm)を合計で100層積層させた接着剤層の積層体(厚さ1mm、サイズ4cm×6cm)を得た。上記のようにして得られた接着剤層の積層体(厚さ1mm)から、直径8mmの円柱体(高さ1mm)を打ち抜き、試験片を作製した。上記試験片に、粘弾性測定装置(装置名「ARES G-2」、ティー・エイ・インスツルメント・ジャパン株式会社製)を用いて、測定温度50℃にて、30分間10000Paの応力を印加し、1秒後および30分後の変形率を測定した。
(1)ゲル分率の測定
各実施例及び比較例で作製された接着剤シートから20cm四方の大きさで切り出したものを、試験片として用いた。試験片を温度85℃かつ相対湿度85%で安定した状態の試験機(ヤマト科学株式会社製の恒温恒湿器、IH400)内で300時間保持した。試験機内では、試験片が試験機内部の金属部に接触しないよう、試験機内の棚から試験片をクリップでぶらさげた。300時間経過後に試験片を取り出し、当該試験片中の接着剤層を用いて上記と同様にゲル分率を測定した。
各実施例及び比較例で作製された光学積層体から20cm四方の大きさで切り出したものを、試験片として用いた。試験片を温度85℃かつ相対湿度85%で安定した状態の試験機(ヤマト科学株式会社製の恒温恒湿器、IH400)内で300時間保持した。試験機内では、試験片が試験機内部の金属部に接触しないよう、試験機内の棚から試験片をクリップでぶらさげた。300時間経過後に試験片を取り出し、当該試験片の中央部を3mm角のサイズで切り出した。その後、切り出した試験片を用いて、上記と同様に凹凸賦形フィルムの凹部内の接着剤層の高さを測定した。
12s、18s 主面(表面)
20a、20b 接着剤層
30 第2光学シート
32s、38s 主面(表面)
50 導光板
60 光源
100A、100B、101A、102A、101B、102B 光学積層体
200 照明装置
Claims (10)
- 多価カルボン酸と多価アルコールの共重合体であるポリエステル樹脂と、架橋剤と、有機ジルコニウム化合物、有機鉄化合物および有機アルミニウム化合物からなる群から選択される少なくとも1つの架橋触媒とを含む接着剤組成物を架橋させることによって形成されており、
温度85℃かつ相対湿度85%で300時間保持した後のゲル分率が40%以上であり、
PMMAフィルムに対する180°ピール接着力が100mN/20mm以上である、接着剤層。 - 前記多価カルボン酸は、芳香族ジカルボン酸を含む、請求項1に記載の接着剤層。
- 前記多価アルコールは、脂肪族ジオールまたは脂環族ジオールを含む、請求項1または2に記載の接着剤層。
- 前記架橋剤は、イソシアネート系架橋剤を含む、請求項1から3のいずれか1項に記載の接着剤層。
- 前記イソシアネート系架橋剤は、脂肪族イソシアネート系架橋剤を含む、請求項4に記載の接着剤層。
- 厚さが3μm以上20μm以下である、請求項1から5のいずれか1項に記載の接着剤層。
- 温度85℃かつ相対湿度85%で300時間保持した後のゲル分率が55%以上である、請求項1から6のいずれか1項に記載の接着剤層。
- 回転式レオメータを用いたクリープ試験において、50℃で10,000Paの応力を1秒間印加したときのクリープ変形率が10%以下であり、かつ、50℃で10,000Paの応力を30分間印加したときのクリープ変形率が16%以下である、請求項1から7のいずれか1項に記載の接着剤層。
- 凹凸構造を有する第1主面および前記第1主面と反対側の第2主面を有する第1光学シートと、
前記第1光学シートの前記第1主面側に配置された、請求項1から8のいずれか1項に記載の接着剤層と
を有し、
前記凹凸構造は、前記接着剤層と接する平坦部を含む、光学積層体。 - 前記接着剤層の前記第1光学シートと反対側に配置された第2光学シートをさらに有する、請求項9に記載の光学積層体。
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US18/277,410 US20240124755A1 (en) | 2021-02-19 | 2022-02-04 | Adhesive agent layer and optical layered body having adhesive agent layer |
KR1020237026948A KR20230146017A (ko) | 2021-02-19 | 2022-02-04 | 접착제층 및 접착제층을 갖는 광학 적층체 |
JP2023500728A JPWO2022176658A1 (ja) | 2021-02-19 | 2022-02-04 | |
EP22755979.6A EP4296328A1 (en) | 2021-02-19 | 2022-02-04 | Adhesive agent layer and optical layered body having adhesive agent layer |
CN202280015792.2A CN116867864A (zh) | 2021-02-19 | 2022-02-04 | 粘接剂层及具有粘接剂层的光学层叠体 |
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2022
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- 2022-02-04 CN CN202280015792.2A patent/CN116867864A/zh active Pending
- 2022-02-04 JP JP2023500728A patent/JPWO2022176658A1/ja active Pending
- 2022-02-04 WO PCT/JP2022/004554 patent/WO2022176658A1/ja active Application Filing
- 2022-02-04 EP EP22755979.6A patent/EP4296328A1/en active Pending
- 2022-02-04 KR KR1020237026948A patent/KR20230146017A/ko unknown
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WO2011124765A1 (en) | 2010-04-06 | 2011-10-13 | Kari Rinko | Laminate structure with embedded cavities and related method of manufacture |
JP2012007046A (ja) | 2010-06-23 | 2012-01-12 | Nitto Denko Corp | 光学積層シート、光学積層シートの製造方法、光学積層シート付光源、および光学積層シート付画像表示装置 |
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JPWO2022176658A1 (ja) | 2022-08-25 |
EP4296328A1 (en) | 2023-12-27 |
TW202248005A (zh) | 2022-12-16 |
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