WO2015108160A1 - 透明な粘着剤層を有する粘着剤シート - Google Patents
透明な粘着剤層を有する粘着剤シート Download PDFInfo
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- WO2015108160A1 WO2015108160A1 PCT/JP2015/051131 JP2015051131W WO2015108160A1 WO 2015108160 A1 WO2015108160 A1 WO 2015108160A1 JP 2015051131 W JP2015051131 W JP 2015051131W WO 2015108160 A1 WO2015108160 A1 WO 2015108160A1
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- Prior art keywords
- refractive index
- pressure
- sensitive adhesive
- adhesive layer
- adhesive sheet
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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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/255—Polyesters
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
-
- 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
- C09J7/20—Adhesives in the form of films or foils characterised by their carriers
- C09J7/22—Plastics; Metallised plastics
- C09J7/24—Plastics; Metallised plastics based on macromolecular compounds obtained by reactions involving only carbon-to-carbon unsaturated bonds
- C09J7/241—Polyolefin, e.g.rubber
-
- 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
- C09J9/00—Adhesives characterised by their physical nature or the effects produced, e.g. glue sticks
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2237—Oxides; Hydroxides of metals of titanium
- C08K2003/2241—Titanium dioxide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2244—Oxides; Hydroxides of metals of zirconium
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/002—Physical properties
- C08K2201/005—Additives being defined by their particle size in general
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K7/00—Use of ingredients characterised by shape
- C08K7/16—Solid spheres
- C08K7/18—Solid spheres inorganic
-
- 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
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F2202/00—Materials and properties
- G02F2202/28—Adhesive materials or arrangements
Definitions
- the present invention relates to an adhesive sheet having a transparent adhesive layer.
- the present invention relates to a pressure-sensitive adhesive sheet having a transparent pressure-sensitive adhesive layer that can be used for bonding a transparent optical member to another optical member.
- a display device such as a liquid crystal display device or an organic EL display device is a pressure-sensitive adhesive for bonding a transparent cover member such as a polarizing film, a retardation film, a cover glass, and other various transparent optical members to other optical members.
- a transparent cover member such as a polarizing film, a retardation film, a cover glass, and other various transparent optical members to other optical members.
- an adhesive layer is disposed between two optical members to be bonded, and the two optical members are bonded together by pressing them together to form an optical member laminate.
- the optical member laminate having such a configuration is arranged in the display device such that the transparent optical member side is the viewing side. In this configuration, when external light enters from the viewing-side transparent optical member, there is a problem that the incident light is reflected at the interface between the adhesive layer and the non-viewing-side optical member and returns to the viewing side. This problem is particularly noticeable when the incident angle of external light is shallow.
- the surface of the bonded optical member to which the transparent optical member is bonded is made of patterned ITO (indium tin oxide) or the like.
- ITO indium tin oxide
- a transparent and conductive layer is formed.
- the pattern of the transparent conductive layer becomes visible from the viewing side due to the influence of internal reflection of incident light at the interface between the adhesive layer and the transparent conductive layer. Is pointed out.
- Patent Document 1 discloses an adhesive composition that can reduce total reflection of light at an interface between a transparent optical member and an adhesive layer and an interface between the adhesive layer and the bonded optical member. Disclose. It is described that the composition disclosed here has a high refractive index after drying and / or curing, and is close to the refractive index of the transparent optical member and the bonded optical member. The teaching of Patent Document 1 is that the entire pressure-sensitive adhesive layer that joins two optical members has a refractive index close to that of the two optical members.
- Patent Document 2 discloses a refraction having a configuration in which zirconium oxide or titanium oxide particles having a dispersion average particle diameter of 1 nm or more and 20 nm or less are dispersed over the entire thickness of a transparent adhesive made of an acrylic resin. Disclosed is an adhesive with an adjusted rate. In this pressure-sensitive adhesive, since zirconium oxide or titanium oxide particles, which are high refractive index materials, are mixed in a transparent pressure-sensitive adhesive, the refractive index of the entire pressure-sensitive adhesive layer is increased, and the above-described interface reflection can be suppressed. Conceivable.
- Patent Document 3 proposes to coat metal oxide particles dispersed in an adhesive with a polymer in order to improve the technique described in Patent Document 2.
- Patent Document 3 teaches that since the metal oxide is exposed on the surface of the pressure-sensitive adhesive layer in the pressure-sensitive adhesive layer of Patent Document 2, there is a problem that the adhesiveness is lowered. This problem is solved by coating with a polymer.
- the technique proposed by Patent Document 3 may be able to improve to some extent the adhesiveness of the pressure-sensitive adhesive layer, many of the problems pointed out in relation to Patent Document 2 cannot be solved.
- the configuration described in Patent Document 3 is more expensive than the configuration of Patent Document 2 because the metal oxide particles are coated with a specific polymer.
- the main object of the present invention is to provide a pressure-sensitive adhesive sheet including a pressure-sensitive adhesive layer that can be easily and inexpensively manufactured and can effectively suppress internal reflection when used for joining optical member laminates. To do.
- the present invention forms a refractive index adjustment section having a higher refractive index than the base material of the pressure-sensitive adhesive layer over a certain range from the surface of the pressure-sensitive adhesive layer to the thickness direction in order to achieve the above-mentioned object.
- the pressure-sensitive adhesive layer is used for joining optical members, the internal reflection in the laminate formed by these optical members is suppressed.
- the present invention provides a pressure-sensitive adhesive sheet comprising a support and a transparent pressure-sensitive adhesive layer on the support.
- the pressure-sensitive adhesive layer comprises a base pressure-sensitive adhesive layer essentially formed of a transparent pressure-sensitive adhesive base material from one main surface to the thickness direction, and a thickness direction from the other main surface of the pressure-sensitive adhesive layer.
- a transparent adhesive refractive index adjusting section formed over the refractive index adjusting section, the refractive index adjusting section having a higher refractive index than the refractive index of the adhesive base material.
- the refractive index adjusting section preferably has a thickness of 20 nm to 600 nm.
- the refractive index adjustment section is configured such that particles of a high refractive index material having a higher refractive index than the adhesive material are dispersed in the same adhesive material as the adhesive base material. It may be configured to increase the average refractive index of the product section.
- the refractive index of the particles of the high refractive index material is preferably 1.60 to 2.74.
- the particles of the high refractive index material preferably have an average primary particle diameter of 3 nm to 100 nm by TEM observation.
- the high refractive index material may be one or more compounds selected from the group consisting of TiO 2 , ZrO 2 , CeO 2 , Al 2 O 3 , BaTiO 3 , Nb 2 O 5 , and SnO 2. .
- the other main surface of the refractive index adjusting section has a region where particles of a high refractive material are exposed on the other main surface and an adhesive material of the refractive index adjusting section.
- a matrix region exposed on the other main surface can be formed.
- the region where the high refractive material particles are exposed on the main surface is preferably formed in an area ratio of 30 to 99%.
- the difference in refractive index between the particles of the high refractive index material and the adhesive base material is preferably 0.15 to 1.34.
- the total light transmittance of the pressure-sensitive adhesive layer is preferably 80% or more.
- the particles of the high refractive index material can include a portion where a plurality of particles are present in the form of an aggregate.
- the refractive index adjustment section preferably has a thickness of 20 nm to 600 nm.
- the refractive index adjusting section is configured such that particles of a high refractive index material having a higher refractive index than that of the adhesive material are dispersed in the same adhesive material as the adhesive base material.
- the average refractive index of the adjustment section can be increased.
- the refractive index of the pressure-sensitive adhesive base material is preferably 1.40 to 1.55, and the refractive index of the particles of the high refractive index material is preferably 1.60 to 2.74.
- the region where the particles of the high refractive material are in contact with the optical member and a matrix in which the adhesive material of the refractive index adjusting section is in contact with the optical member is preferably formed in an area ratio of 30 to 99%.
- the difference in refractive index between the high refractive index material particles and the adhesive base material is preferably 0.15 to 1.34.
- the refractive index adjusting section includes an organic material in the form of particles, polymer, or oligomer having a higher refractive index than the adhesive material in the same adhesive material as the adhesive base material. It may be configured to increase the average refractive index.
- the refractive index of the transparent conductive layer is set to 1.75 to 2.14.
- the refractive index of the material is preferably 1.40 to 1.55, and the refractive index of the organic material is preferably 1.59 to 2.04.
- the organic material having a high refractive index used here is not particularly limited, but in addition to a resin having an aromatic ring such as styrene, a resin containing a heteroatom such as sulfur or nitrogen (for example, a thiol or triazine ring is included).
- Polymer The particles include nanometer-sized organic nanoparticles and spherical polymers, and the particle diameter is preferably 3 nm to 100 nm in average primary particle diameter by TEM observation.
- the pressure-sensitive adhesive layer preferably has a total light transmittance of 80% or more.
- the particles of the high refractive index material can include a portion where a plurality of particles are present in the form of an aggregate.
- the particles of the high refractive material included in the refractive index adjusting section are present at irregular depths in the thickness direction of the pressure-sensitive adhesive layer.
- the adhesive sheet according to the present invention is used to join the transparent first optical member to the second optical member having a transparent conductive layer constituting a touch sensor, for example, the adhesive layer is supported by the support.
- external light incident through the first optical member is divided and refracted essentially by the pressure-sensitive adhesive base material in the pressure-sensitive adhesive layer.
- the reflected light at the interface with the rate adjusting section and the reflected light at the interface between the refractive index adjusting section and the second optical member can be at least partially offset by optical interference.
- the refractive index adjustment section having a higher refractive index than the base material of the pressure-sensitive adhesive layer is formed in the thickness direction from one surface of the pressure-sensitive adhesive layer, a region having a high refractive index without increasing the haze value. Can be formed. Therefore, when the two optical members as described above are bonded using the pressure-sensitive adhesive sheet of the present invention, the refractive index adjusting section, which is a high refractive index region, is a refractive index between the second optical member. The difference can be adjusted, and thereby reflection at the interface between the pressure-sensitive adhesive layer and the second optical member can be suppressed.
- the refractive index of the refractive index adjustment section of the adhesive layer with respect to the refractive index of the transparent conductive layer and the second optical member is set.
- interface reflection can be suppressed.
- due to the canceling effect due to the phase difference between the reflected light between the reflected light on the transparent conductive layer, the reflected light on the surface of the second optical member, and the reflected light generated inside the adhesive layer It becomes possible to greatly reduce the reflected light returning.
- (A) is sectional drawing which shows one Embodiment of the adhesive sheet by this invention
- (b) is sectional drawing of the optical member laminated body which shows an example of the simplest embodiment which uses the adhesive sheet by this invention.
- It is a top view which shows the state of the main surface of the adhesive layer which contacts a 2nd optical member. 2 shows a process for producing the pressure-sensitive adhesive layer shown in FIG.
- FIG. 2 The structure of the 2nd optical member produced in the Example of this invention is shown, (a) (b) (c) shows 2nd optical member with ITO (1) (2) (3), respectively.
- the structure of the optical member laminated body by the Example of this invention is shown, (a) (b) (c) shows Example 1, 2, and 3, respectively. It is a 20000 times SEM photograph which shows the surface state of the division for refractive index adjustment of the adhesive layer produced by the Example of this invention.
- (A) and (b) are 30000 times TEM cross-sectional photographs showing the distribution of high refractive index material particles in the refractive index adjusting section in the pressure-sensitive adhesive layer obtained by different examples of the present invention.
- FIG. 1A is a cross-sectional view showing an embodiment of the pressure-sensitive adhesive sheet according to the present invention
- FIG. 1B is a cross-section of the optical member laminate 1 showing an example of the simplest embodiment using the pressure-sensitive adhesive sheet according to the present invention.
- an adhesive sheet S according to an embodiment of the present invention includes an optically transparent adhesive layer 3 and a release paper bonded to one main surface of the adhesive layer 3.
- the first support S1 and the second support S2 made of release paper bonded to the other main surface of the pressure-sensitive adhesive layer 3.
- the optical member laminate 1 is bonded to an optically transparent first optical member 2 and the first optical member 2 via an optically transparent adhesive layer 3.
- the second optical member 4 is configured.
- the pressure-sensitive adhesive layer 3 is obtained by peeling off the supports S1 and S2 from the pressure-sensitive adhesive sheet S shown in FIG. 1A and bonding them to the first and second optical members.
- the transparent first optical member 2 is composed of a polarizing film, a retardation film, an optical film used for other optical display devices, or a transparent cover member such as a viewing side cover glass of an optical display device. Can do.
- the first optical member 2 is bonded to the first main surface 5 of the pressure-sensitive adhesive layer 3, and the second optical member 4 is bonded to the second main surface 6 of the pressure-sensitive adhesive layer 3.
- the transparent pressure-sensitive adhesive layer 3 has a base pressure-sensitive adhesive section 3a essentially formed of a pressure-sensitive adhesive base material, and a refractive index adjusting section 3b having a higher refractive index than the base pressure-sensitive adhesive section 3a.
- the refractive index of the adhesive base material forming the base adhesive section 3 a preferably has a refractive index close to the refractive index of the first optical member 2.
- the adhesive base material is not particularly limited as long as it is a transparent material having adhesiveness that can be used for optical applications.
- an acrylic adhesive, a rubber adhesive, a silicone adhesive, a polyester adhesive, a urethane adhesive, an epoxy adhesive, and a polyether adhesive can be used as appropriate. From the viewpoint of transparency, workability, durability, etc., it is preferable to use an acrylic pressure-sensitive adhesive.
- the pressure-sensitive adhesive base material any one of the above-mentioned pressure-sensitive adhesives can be used alone, or two or more kinds can be used in combination.
- the acrylic polymer used as the base polymer of the acrylic pressure-sensitive adhesive is not particularly limited, but is preferably a monomer homopolymer or copolymer mainly composed of (meth) acrylic acid alkyl ester.
- (meth) acryl is used to mean one or both of “acryl” and “methacryl”, and the same applies to other cases.
- the term “acrylic polymer” is used in the sense that in addition to the above-mentioned (meth) acrylic acid alkyl ester, other monomers copolymerizable therewith are also included.
- the refractive index of the adhesive base material is generally 1.40 to 1.55.
- the thickness of the pressure-sensitive adhesive layer 3 is not particularly limited, but is usually 5 ⁇ m to 500 ⁇ m, preferably 5 ⁇ m to 400 ⁇ m, and more preferably 5 ⁇ m to 500 ⁇ m.
- the thickness of the refractive index adjusting section 3b is preferably 20 nm to 600 nm, more preferably 20 nm to 300 nm, and still more preferably 20 nm to 200 nm.
- the boundary between the refractive index adjustment section 3b and the base adhesive section 3a has an irregular uneven shape. In the present invention, the thickness of the refractive index adjustment section 3b averages the measured depth of the uneven shape.
- the thickness of the base adhesive section is a value obtained by subtracting the thickness of the refractive index adjustment section 3b from the thickness of the adhesive layer 3.
- the total light transmittance of the entire pressure-sensitive adhesive layer 3 is 80% or more, preferably 90% or more, as a value measured in accordance with JIS K7361.
- the total light transmittance of the pressure-sensitive adhesive layer 3 is preferably as high as possible.
- the haze value is preferably 1.5% or less, more preferably 1% or less.
- the refractive index adjusting section 3b is formed by, for example, applying a predetermined amount of a resin material solution having a refractive index higher than that of the pressure-sensitive adhesive base material to one surface of the pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive base material and drying the solution.
- a resin material that can be used for this purpose for example, there is a pressure-sensitive adhesive composition described in Patent Document 1.
- a method may be employed in which a dispersion in which an organic substance having a higher refractive index than that of the pressure-sensitive adhesive base material, for example, a styrene oligomer is dispersed as a solid, is applied to the surface of the pressure-sensitive adhesive base material layer and dried.
- the particles of the high refractive index material are permeated from one side of the pressure-sensitive adhesive layer formed of the pressure-sensitive adhesive base material, It is preferable that the particles of the high refractive index material are dispersed in a region adjacent to the surface.
- the pressure-sensitive adhesive layer 13 has a first main surface 15 and a second main surface 16 as well as the pressure-sensitive adhesive layer 3 of the embodiment shown in FIG. Although it is the structure which has the base adhesive classification
- the section for use 13b penetrates into the pressure-sensitive adhesive base material from the second main surface 16 to a depth in the thickness direction, and includes particles 17 of a high refractive index material dispersed in the pressure-sensitive adhesive base material. It is comprised so that it may have a refractive index higher than the agent division 13a.
- the refractive index of the high refractive index material particles 17 in the refractive index adjusting section 13b is preferably in the range of 1.6 to 2.7.
- the difference in refractive index between the high refractive index material particles and the pressure sensitive adhesive base material is preferably 0.2 to 1.3.
- the refractive index adjusting section is formed by impregnating an organic material having a refractive index higher than that of the adhesive base material, similarly, the difference in refractive index between the organic material and the adhesive base material is set to 0.1 to 0. .6 is preferable.
- High refractive index materials that can be used in this embodiment of the present invention that uses high refractive index material particles in the refractive index adjusting section include TiO 2 , ZrO 2 , CeO 2 , Al 2 O 3 , BaTiO 2 , Nb 2 O. 5 and SnO 2 , and one or more compounds selected from these groups can be used to form the high refractive index material particles 17.
- the average primary particle diameter of the high refractive index material particles 17 may be 3 nm to 100 nm, and the particles are distributed in the refractive index adjustment section 13b in a dispersed state or in a partially aggregated state. .
- the boundary between the refractive index adjusting section 13b and the base adhesive section 13a has an irregular concavo-convex shape as described with reference to FIG. 1, but in measuring the thickness of the refractive index adjusting section 13b.
- the depth range in which 90% of the high refractive index material particles 17 are present is defined as the thickness measurement value of the section 13b at the measurement position, and the measurement values at a plurality of measurement positions are averaged to adjust the refractive index.
- the thickness of the section 13b for use is assumed.
- FIG. 3 shows a configuration in which a transparent conductive layer 7 such as a patterned ITO film is formed on the surface of the second optical member 4 on the pressure-sensitive adhesive layer side in order to configure a touch panel sensor. It is sectional drawing which shows embodiment to which the adhesive layer 13 to show is applied.
- the glass substrate of the display panel in a liquid crystal display device or an organic EL display device can be mentioned, for example.
- FIG. 4 is a plan view showing a state of the main surface 16 of the pressure-sensitive adhesive layer 13 in contact with the second optical member 4.
- a high-refractive-index material particle 17 is dispersed in an island shape in a matrix 18 of an adhesive base material, and has an island configuration, and the adhesive layer 13 contacts the second optical member 4.
- the area ratio of the high refractive index material particles 17 to the total area of the high refractive index material particles 17 and the adhesive base material at this position is preferably in the range of 30 to 99%.
- the area ratio should be the ratio of the area occupied by the high refractive index material particles 17 to the total area of the square region in a square region with a side of 10 ⁇ m to 200 ⁇ m, and measurement is performed for a plurality of rectangular regions, and the measured values are averaged. Thus, the area ratio is obtained.
- FIGS. 5 (a), 5 (b), and 5 (c) are diagrams schematically showing a process of manufacturing the pressure-sensitive adhesive layer 13 shown in FIG.
- a dispersion 19 in which the above-described high refractive index material particles 17 are dispersed in a solvent and a layer 20 of an adhesive base material are prepared.
- the dispersion 19 is applied to the surface of the pressure-sensitive adhesive base material layer 20.
- the surface of the pressure-sensitive adhesive base material layer 20 is swollen by the solvent of the dispersion liquid 19, and the high refractive index material particles 17 in the dispersion liquid 19 penetrate into the pressure-sensitive adhesive base material layer 20 in the thickness direction in the process.
- FIG. Thereafter, the pressure-sensitive adhesive base material layer 20 is dried by a drying step, whereby the solvent of the dispersion liquid 19 is evaporated and the pressure-sensitive adhesive layer 13 shown in FIG. 2 can be obtained.
- the penetration depth of the high refractive index material particles 17 into the adhesive base material layer 20 is determined by the relationship between the adhesive base material and the solvent of the dispersion liquid 19.
- the solvent can be appropriately selected so that the penetration depth becomes the value described above.
- Adsorption oligomer 60 parts by weight of dicyclopentanyl acrylate (DCPMA, dicyclopentanyl methacrylate), 40 parts by weight of methyl methacrylate (MMA, methyl methacrylate), 3.5 parts by weight of ⁇ -thioglycerol as a chain transfer agent, and a polymerization solvent 100 parts by weight of toluene was put into a four-necked flask, and these were stirred at 70 ° C. for 1 hour in a nitrogen atmosphere.
- DCPMA dicyclopentanyl acrylate
- MMA methyl methacrylate
- ⁇ -thioglycerol a polymerization solvent
- the acrylic polymer thus obtained was designated as “acrylic polymer (A-1)”.
- the acrylic polymer (A-1) had a weight average molecular weight (Mw) of 5.1 ⁇ 10 3 .
- Adhesive A A monomer mixture composed of 68 parts by weight of 2-ethylhexyl acrylate (2EHA), 14.5 parts by weight of N-vinyl-2-pyrrolidone (NVP), and 17.5 parts by weight of 2-hydroxyethyl acrylate (HEA) , 0.035 parts by weight of a photopolymerization initiator (trade name “Irgacure 184”, manufactured by BASF) and 0.035 parts by weight of a photopolymerization initiator (trade name “Irgacure 651”, manufactured by BASF) Ultraviolet rays were irradiated until the viscosity (measurement condition: BH viscometer No. 5 rotor, 10 rpm, measurement temperature 30 ° C.) reached about 20 Pa ⁇ s to obtain a prepolymer composition in which a part of the monomer component was polymerized. .
- the acrylic polymer (A-1), 0.15 parts by weight of hexanediol diacrylate (HDDA), a silane coupling agent (trade name “KBM-403”, Shin-Etsu) are added to the prepolymer composition.
- Chemical Co., Ltd. 0.3 parts by weight was added and mixed to obtain an acrylic pressure-sensitive adhesive composition.
- the acrylic pressure-sensitive adhesive composition is applied on the release-treated surface of a release film (trade name “MRF # 38”, manufactured by Mitsubishi Plastics Co., Ltd.) so that the thickness after forming the pressure-sensitive adhesive layer is 150 ⁇ m.
- an adhesive composition layer was formed, and then a release film (trade name “MRN # 38”, manufactured by Mitsubishi Plastics, Inc.) was bonded to the surface of the adhesive composition layer. Thereafter, ultraviolet irradiation was performed under the conditions of illuminance: 5 mW / cm 2 and light amount: 1500 mJ / cm 2 to photocure the pressure-sensitive adhesive composition layer to form a pressure-sensitive adhesive layer.
- a release film trade name “MRN # 38”, manufactured by Mitsubishi Plastics, Inc.
- this monomer mixture was partially photopolymerized by exposing it to ultraviolet rays under a nitrogen atmosphere to obtain a partially polymerized product (acrylic polymer syrup) having a polymerization rate of about 10% by weight.
- acrylic polymer syrup acrylic polymer syrup
- TMPTA trimethylolpropane triacrylate
- silane coupling agent trade name: KBM-403, manufactured by Shin-Etsu Chemical Co., Ltd.
- the final thickness of the monomer component prepared as described above is applied to the release-treated surface of a 38 ⁇ m-thick polyester film (trade name: Diafoil MRF, manufactured by Mitsubishi Resin Co., Ltd.) whose one side is peel-treated with silicone.
- a coating layer was formed by coating to a thickness of 100 ⁇ m.
- a 38 ⁇ m thick polyester film (trade name: Diafoil MRE, manufactured by Mitsubishi Resin Co., Ltd.) having one surface peeled with silicone on the surface of the applied monomer component, the peel-treated surface of the film is on the coating layer side It coat
- the sheet having the coating layer thus obtained was irradiated with ultraviolet rays having an illuminance of 5 mW / cm 2 (measured with Topcon UVR-T1 having a maximum sensitivity of about 350 nm) using a chemical light lamp (manufactured by Toshiba Corporation). Irradiated for 2 seconds to cure the coating layer to form a pressure-sensitive adhesive layer, and a pressure-sensitive adhesive sheet (baseless type, pressure-sensitive adhesive layer thickness: 100 ⁇ m) having release sheets provided on both sides of the pressure-sensitive adhesive layer was produced.
- Treatment liquid for coating (dispersion medium) containing zirconia particles (ZrO 2 , refractive index: 2.17, average primary particle size: 20 nm) as a dispersion containing high refractive index particles on the surface of the exposed pressure-sensitive adhesive layer : Ethanol, particle concentration: 1.5% by weight, dispersion transmittance: 75%, manufactured by CIK Nanotech Co., Ltd.), bar coater RDS No. 5 and dried in a drying oven at 110 ° C. for 180 seconds.
- a PET release sheet as a support was bonded to the surface of the pressure-sensitive adhesive layer in which zirconia (ZrO 2 ) particles were dispersed to obtain a pressure-sensitive adhesive sheet. In this way, the average primary particle diameter of the zirconia particles was measured by TEM observation.
- a pressure-sensitive adhesive sheet was similarly prepared using the following pressure-sensitive adhesive and nanoparticle dispersion liquid of a high refractive index material.
- the materials used are adhesive B (refractive index 1.48), adhesive C (refractive index 1.47), ZrO 2 nanoparticle dispersion (dispersion medium: n-propanol, particle size 20 nm), ZrO 2 nanoparticle dispersion. Liquid (dispersion medium: ethanol, particle size 30 nm) and ZrO 2 nanoparticle dispersion liquid (dispersion medium: n-propanol, particle diameter 20 nm).
- One lightly peeled PET of the pressure sensitive adhesive A (the refractive index of the pressure sensitive adhesive layer: 1.49) in a state where the thickness of the pressure sensitive adhesive layer is 150 ⁇ m and both surfaces of the pressure sensitive adhesive layer are protected by the lightly peeled PET sheet. The sheet was peeled off.
- a styrene oligomer solution (refractive index: 1.60, manufactured by Toagosei Co., Ltd., UP-1150) previously dissolved in toluene so as to have a solid content concentration of 2% by weight is applied to the surface of the exposed adhesive layer.
- a PET release sheet as a support was bonded to the surface of the pressure-sensitive adhesive layer on which styrene was arranged to obtain a pressure-sensitive adhesive sheet.
- FIGS. 9 (a) and 9 (b) A cross section in the vicinity of the surface having the high refractive index material particles of the pressure-sensitive adhesive layer of the example was observed at a magnification of 30,000 using a transmission electron microscope (TEM). The results are shown in FIGS. 9 (a) and 9 (b).
- FIG. 9A the high refractive index material particles are distributed almost uniformly over almost the entire thickness of the refractive index adjusting section.
- FIG. 9B the high refractive index material in the pressure-sensitive adhesive layer is used. It can be seen that the particle distribution is highest on the surface of the pressure-sensitive adhesive layer and has a distribution that decreases in the thickness direction of the pressure-sensitive adhesive layer.
- ⁇ Average surface refractive index> The average surface refractive index of the adhesive layers obtained in Examples and Comparative Examples was measured for the refractive index at sodium D line (589 nm) using a spectroscopic ellipsometer (EC-400, manufactured by JA Woollam).
- the average refractive index of the surface on which the particles were applied was measured in a state where the release sheets on both sides were peeled off and the blackboard was bonded to the surface on which the particles were not applied.
- the average refractive index of the pressure-sensitive adhesive layer surface was measured in a state where both the release sheets were peeled off and a blackboard was bonded to one surface.
- ⁇ Measurement of thickness of refractive index adjustment layer> The cross section in the depth direction of the pressure-sensitive adhesive layer was adjusted, and TEM observation was performed. The thickness of the refractive index adjusting layer was measured from the obtained TEM image (direct magnification: 3000 to 30000 times). The thickness of the refractive index adjustment layer is the average value of the unevenness of the interface between the adhesive base layer and the adjustment layer. If it is difficult to distinguish the interface with the adhesive base layer, the surface TEM image is converted into image processing software ( ImageJ) was subjected to binary image processing, and the depth of the region where 90% of the nanoparticles were present was defined as the thickness of the adjustment layer.
- ImageJ image processing software
- ⁇ Area ratio of high refractive index particles The surface of the pressure-sensitive adhesive layer on the particle application side was observed using an FE-SEM at an acceleration voltage of 2 kV, an observation magnification of 500 times, 2,000 times, and 5,000 times.
- image processing software image processing software
- the other release sheet is peeled off and pressure-bonded to a glass plate as a test plate (trade name: soda lime glass # 0050, manufactured by Matsunami Glass Industry Co., Ltd.) under a 2 kg roller, one reciprocating pressure condition.
- a test plate trade name: soda lime glass # 0050, manufactured by Matsunami Glass Industry Co., Ltd.
- a sample composed of a test plate / adhesive layer / PET film was prepared.
- the obtained sample was autoclaved (50 ° C., 0.5 MPa, 15 minutes), and then 23 ° C., 50% R.D. H. And allowed to cool for 30 minutes.
- a tensile tester device name: Autograph AG-IS, manufactured by Shimadzu Corporation
- JIS Z0237 23 ° C., 50% R.D. H.
- the pressure-sensitive adhesive sheet pressure-sensitive adhesive layer / PET film
- a high-refractive-index material non-coated pressure-sensitive adhesive sheet was prepared, and the high-refractive-index material non-coated pressure-sensitive adhesive sheet also had a 180-degree peel adhesive strength as described above. It was measured.
- ⁇ Transmissivity of dispersion containing high refractive index particles The transmittance of the dispersion containing the high refractive index particles was measured with a photoelectric colorimeter (AC-114, manufactured by OPTIMA) using a 530 nm filter. The transmittance (%) of the dispersion used in each Example and Comparative Example was measured with the transmittance of the dispersion solvent alone being 100%.
- One surface of the optical member laminates of Examples and Comparative Examples is used as a reflectance measurement surface, and a single-sided adhesive black PET (PET75NBPET38, manufactured by Lintec Corporation) is pasted on the opposite surface, and a sample for reflectance measurement is used. did.
- the reflectance (Y value) on the reflectance measurement surface side of the optical member laminate was measured with a reflective spectrophotometer (U4100, manufactured by Hitachi High-Technologies Corporation). The measurement was performed at both positions where the transparent conductive layer was etched and where the transparent conductive layer was not etched.
- the measurement of the etched portion (opening) of the transparent conductive layer is the reflectivity of the interface between the refractive index adjustment layer of the pressure-sensitive adhesive layer and the refractive index adjustment layer of the optical member laminate, and the portion not etched (
- the measurement of (pattern part) shows the reflectance of the refractive index adjustment layer and transparent conductive layer interface of an adhesive layer.
- the reflection suppression rate was calculated based on the following formula for each of the etched part and the non-etched part.
- “reflectance when there is no particle (%)” is the reflectance of the optical member laminate of the comparative example (when no particle is used). That is, the reflection suppression rate is an index indicating how much the reflectance can be reduced by having the refractive index adjustment layer.
- Reflection suppression rate (%) Reflectivity (%)-Reflectance without particles (%) [Preparation of laminate of adhesive with refractive index adjusting layer and transparent conductive layer]
- ⁇ Preparation of a transparent conductive layer using ZEONOR (COP) as a substrate> A plurality of particles having a diameter of 3 ⁇ m (trade name: “SSX105”) on both sides of a 100 ⁇ m-thick cycloolefin polymer film (trade name: “ZEONOR ZF16”, in-plane birefringence: 0.0001, manufactured by Nippon Zeon Co., Ltd.) “Sekisui Resin Co., Ltd.” was added to the binder resin (trade name: “Unidic RS29-120”, manufactured by DIC Corporation) in an amount of 0.07 part using a bar coater. Then, after drying in an oven at 80 ° C.
- a film having an anti-blocking layer on both sides was formed by irradiating ultraviolet rays (high pressure mercury lamp) each having an accumulated light amount of 300 mJ (hereinafter referred to as COP base material).
- a refractive index adjusting agent (trade name: “OPSTAR KZ6661”, manufactured by JSR Co., Ltd.) is applied to one side of the COP substrate with a bar coater, dried in an oven at 80 ° C. for 1 minute, A 300 mJ ultraviolet ray (high pressure mercury lamp) was irradiated to form a refractive index adjusting layer having a thickness of 100 nm and a refractive index of 1.65.
- ITO indium tin oxide layer
- ⁇ Preparation of transparent conductive layer using PET as substrate> A plurality of particles having a diameter of 3 ⁇ m (trade name: “SSX105”, manufactured by Sekisui Resin Co., Ltd.) are bonded to one side of a 50 ⁇ m thick PET film (trade name: “Lumirror: U40” manufactured by Toray Industries, Inc.). : “Unidic RS29-120” (manufactured by DIC) 100 parts of coating solution was applied using a bar coater, dried in an oven at 80 ° C. for 1 minute, An anti-blocking layer having a film thickness of 1.5 ⁇ m was formed on one side by irradiating 300 mJ ultraviolet rays (high pressure mercury lamp).
- the hard coat resin (trade name: “OPSTAR KZ7540 (silica nanoparticle-containing)”, manufactured by JSR Corporation) is adjusted to a solid content of 10% with MIBK on the opposite side to the previously coated surface.
- the coated liquid is applied using a bar coater, dried in an oven at 80 ° C. for 1 minute, and then irradiated with ultraviolet light (high-pressure mercury lamp) with an integrated light quantity of 300 mJ to form a hard coat layer with a thickness of 1.5 ⁇ m.
- the film which has it was formed (henceforth PET base material).
- a refractive index adjusting agent (trade name: “OPSTAR H0001 (containing zirconia nanoparticles)”, manufactured by JSR Co., Ltd.) is formed on the hard coat layer obtained earlier so that the solid content becomes 10% with MIBK.
- the prepared coating solution is applied using a bar coater, dried in an oven at 80 ° C. for 1 minute, and then irradiated with ultraviolet light (high pressure mercury lamp) with an integrated light amount of 300 mJ to have a film thickness of 35 nm and a refractive index of 1.63.
- the refractive index adjustment layer 2 was formed.
- a refractive index adjusting agent (trade name: “L-005 (containing hollow nanosilica particles)”, manufactured by JSR Co., Ltd.) is solidified to 1.5% with MIBK.
- the coating liquid prepared as described above was applied using a bar coater, dried in an oven at 80 ° C. for 1 minute, and then irradiated with ultraviolet light (high-pressure mercury lamp) with an integrated light quantity of 300 mJ, with a film thickness of 40 nm and a refractive index.
- a refractive index adjusting layer 1 of 1.49 was formed.
- the PET base material having the refractive index adjusting layers 1 and 2 is put into a take-up type sputtering apparatus, and an indium tin oxide layer (ITO) having a thickness of 23 nm is formed on the surface of the refractive index adjusting layer 1 as a transparent conductive layer. Laminated.
- ITO indium tin oxide layer
- the pressure-sensitive adhesive sheet was laminated so that the transparent conductive layer was in contact with the transparent conductive layer. After peeling off the PET release sheet on the opposite side of the adhesive sheet, a glass slide or a 100 ⁇ m thick cycloolefin polymer film (trade name: “Zeonor ZF16”, in-plane birefringence: for surface protection and optical measurement: 0.0001, manufactured by Nippon Zeon Co., Ltd.).
- FIG. 6A A laminated body 21 shown in FIG. 6A has a refractive index adjustment layer 23 having a refractive index of 1.65 formed on one surface of a COP base material 22 having a refractive index of 1.53.
- a patterned ITO layer 24 is formed.
- the refractive index of ITO was 1.9.
- This laminate 21 is referred to as “second optical member with ITO (1)”.
- a laminated body 31 shown in FIG. 6B has a refractive index adjustment layer 33 having a refractive index of 1.63 formed on one surface of a PET base material 32 having a refractive index of 1.57. Further, another refractive index adjustment layer 33a having a refractive index of 1.49 is formed, and a patterned ITO layer 34 is formed on the refractive index adjustment layer 33a. Even in this case, the refractive index of ITO was 1.9.
- This laminate 31 is referred to as “second optical member with ITO (2)”. Further, a laminate 41 called “second optical member with ITO (3)” shown in FIG.
- the laminated body 41 of the second optical member with ITO (3) has a configuration in which an ITO layer 44 that is not patterned is formed on a glass substrate 42 having a refractive index of 1.53.
- Example 1 As shown to Fig.7 (a), the 2nd optical member (1) with ITO was joined to the glass window 26 which comprises the 1st optical member 2 via the adhesive layer 25 by one Embodiment of this invention.
- the refractive index of the glass window 26 was 1.53.
- the pressure-sensitive adhesive layer 25 has a base pressure-sensitive adhesive section 25a formed of the pressure-sensitive adhesive A and having a refractive index of 1.49, and a refractive index adjusting section 25b having a refractive index of 1.68.
- the refractive index adjusting section 25b is a dispersion of 1.5 wt% zirconium oxide particles, in which zirconium oxide particles having an average particle diameter of 20 nm are dispersed in an ethanol solution, is applied to the surface of the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive A. It is obtained by allowing zirconium oxide particles to permeate in the thickness direction from one surface of the pressure-sensitive adhesive layer and drying.
- the thickness of the pressure-sensitive adhesive layer 25 was 150 ⁇ m
- the thickness of the refractive index adjusting section 25b was 150 nm.
- a black PET film 27 was pasted on the back surface, which is the surface opposite to the refractive index adjustment layer 23 of the COP base material 22. The optical properties of the optical member laminate thus obtained were measured. The results are shown in Table 1.
- Example 2 As shown in FIG.7 (b), the 2nd optical member (2) with ITO was joined to the glass window 36 which comprises the 1st optical member 2 via the adhesive layer 35 by other embodiment of this invention. .
- the refractive index of the glass window 26 was 1.53.
- the pressure-sensitive adhesive layer 35 has a base pressure-sensitive adhesive section 35a formed of the pressure-sensitive adhesive B and having a refractive index of 1.48, and a refractive index adjusting section 35b having a refractive index of 1.62.
- a dispersion of 2.0 wt% zirconium oxide particles in which zirconium oxide particles having an average particle diameter of 20 nm are dispersed in an n-propanol liquid is applied to the surface of the adhesive layer made of the adhesive B.
- the zirconium oxide particles were obtained by infiltrating in the thickness direction from one surface of the pressure-sensitive adhesive layer and drying.
- the thickness of the pressure-sensitive adhesive layer 35 was 100 ⁇ m
- the thickness of the refractive index adjusting section 35b was 500 nm.
- a black PET film 37 was pasted on the back surface, which is the surface opposite to the refractive index adjustment layer 33 of the PET base material 32.
- the optical properties of the optical member laminate thus obtained were measured. The results are shown in Table 1.
- the 2nd optical member (3) with ITO was joined to the window 46 which comprises the 1st optical member 2 via the adhesive layer 45 by further another embodiment of this invention.
- the window 46 is a transparent member having a refractive index of 1.53 manufactured by ZEONOR film (ZF14-100, registered trademark).
- the pressure-sensitive adhesive layer 45 had a base pressure-sensitive adhesive section 45a having a refractive index of 1.46 and a refractive index adjustment section 45b having a refractive index of 1.70, formed of the pressure-sensitive adhesive C.
- the refractive index adjusting section 45b is obtained by applying a dispersion of zirconium oxide particles 1.5 wt%, in which zirconium oxide particles having an average particle diameter of 30 nm are dispersed in an ethanol liquid, to the surface of the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive C. It is obtained by allowing zirconium oxide particles to permeate in the thickness direction from one surface of the pressure-sensitive adhesive layer and drying.
- the thickness of the pressure-sensitive adhesive layer 45 was 25 ⁇ m, and the thickness of the refractive index adjusting section 45b was 200 nm.
- a black PET film 47 was pasted on the back surface of the glass substrate 42 opposite to the ITO layer 44. The optical properties of the optical member laminate thus obtained were measured. The results are shown in Table 1.
- Example 4 Using an adhesive layer having a configuration different from that of Example 1, an optical member laminate similar to that shown in FIG. In this example, the second optical member with ITO (1) was joined to the glass window 26 constituting the first optical member 2 via the adhesive layer 25 according to still another embodiment of the present invention.
- the refractive index of the glass window 26 was 1.53.
- the pressure-sensitive adhesive layer 25 has a base pressure-sensitive adhesive section 25a formed of the pressure-sensitive adhesive A and having a refractive index of 1.49, and a refractive index adjusting section 25b having a refractive index of 1.65.
- the refractive index adjusting section 25b a 0.5 wt% dispersion of titanium oxide particles in which titanium oxide particles having an average particle diameter of 20 nm are dispersed in an n-butanol solution is applied to the surface of the adhesive layer made of the adhesive A.
- the titanium oxide particles were obtained by infiltrating in the thickness direction from one surface of the pressure-sensitive adhesive layer and drying.
- the thickness of the pressure-sensitive adhesive layer 25 was 150 ⁇ m
- the thickness of the refractive index adjusting section 25b was 130 nm.
- a black PET film 27 was pasted on the back surface, which is the surface opposite to the refractive index adjustment layer 23 of the COP base material 22. The optical properties of the optical member laminate thus obtained were measured. The results are shown in Table 1.
- Example 5 By forming a refractive index adjustment section using a styrene oligomer having a refractive index of 1.60, an optical member laminate similar to that shown in FIG. In this example, the second optical member with ITO (1) was joined to the glass window 26 constituting the first optical member 2 via the adhesive layer 25 according to still another embodiment of the present invention.
- the refractive index of the glass window 26 was 1.53.
- the pressure-sensitive adhesive layer 25 had a base pressure-sensitive adhesive section 25a formed of the pressure-sensitive adhesive A and having a refractive index of 1.49, and a refractive index adjusting section 25b having a refractive index of 1.55.
- the refractive index adjusting section 25b a 2 wt% solid dispersion in which a styrene oligomer having a refractive index of 1.60 as a solid content is dispersed in a toluene liquid is applied to the surface of the pressure-sensitive adhesive layer made of the pressure-sensitive adhesive A to obtain a solid It was obtained by allowing the minute portion to permeate in the thickness direction from one surface of the pressure-sensitive adhesive layer and drying.
- the thickness of the pressure-sensitive adhesive layer 25 was 150 ⁇ m
- the thickness of the refractive index adjusting section 25b was 300 nm.
- a black PET film 27 was pasted on the back surface, which is the surface opposite to the refractive index adjustment layer 23 of the COP base material 22. The optical properties of the optical member laminate thus obtained were measured. The results are shown in Table 1.
- the refractive index is higher than the refractive index of the pressure-sensitive adhesive base material in the thickness direction from the surface on the second optical member side. Since the refractive index adjustment section having the refractive index is provided, it is possible to prevent the internally reflected light of the outside light from returning through the first optical member.
- the present invention can be applied to optical display devices such as liquid crystal display devices and organic EL display devices.
- the present invention can be advantageously applied particularly to a touch panel display device having a touch sensor.
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Abstract
Description
面積比は、一辺が10μm~200μmの方形領域において、該方形領域の全体面積に対する高屈折率材料粒子17の占める面積の割合とし、複数の方形領域について測定を行い、その測定値を平均することにより面積比が求められる。
[粘着剤ベースの作製]
(アクリルオリゴマー)
ジシクロペンタニルアクリレート(DCPMA、メタクリル酸ジシクロペンタニル)60重量部、メチルメタクリレート(MMA、メタクリル酸メチル)40重量部、連鎖移動剤としてのα-チオグリセロール3.5重量部、及び重合溶媒としてのトルエン100重量部を、4つ口フラスコに投入し、これらを窒素雰囲気下において70℃で1時間撹拌した。次に、重合開始剤としての2,2´-アゾビスイソブチロニトリル0.2重量部を4つ口フラスコに投入し、70℃で2時間反応させ、続いて、80℃で2時間反応させた。その後、反応液を130℃温度雰囲気下に投入し、トルエン、連鎖移動剤及び未反応モノマーを乾燥除去させ、固形状のアクリル系ポリマーを得た。このようにして得られたアクリル系ポリマーを「アクリル系ポリマー(A-1)」とした。このアクリル系ポリマー(A-1)の重量平均分子量(Mw)は5.1×103であった。
アクリル酸2-エチルヘキシル(2EHA)68重量部、N-ビニル-2-ピロリドン(NVP)14.5重量部、及びアクリル酸2-ヒドロキシエチル(HEA)17.5重量部から構成されるモノマー混合物に、光重合開始剤(商品名「イルガキュア184」、BASF社製)0.035重量部、及び光重合開始剤(商品名「イルガキュア651」、BASF社製)0.035重量部を配合した後、粘度(計測条件:BH粘度計No.5ローター、10rpm、測定温度30℃)が約20Pa・sになるまで紫外線を照射して、上記モノマー成分の一部が重合したプレポリマー組成物を得た。
2-エチルヘキシルアクリレート(2EHA)32重量部、イソステアリルアクリレート(ISTA)48重量部、2-ヒドロキシプロピルアクリレート(2HPA)20重量部、2種の光重合開始剤(商品名:イルガキュア184、BASF製)0.05重量部、及び光重合開始剤(商品名:イルガキュア651、BASF製)0.05重量部を、4つ口フラスコに投入してモノマー混合物を調製した。次いで、このモノマー混合物を窒素雰囲気下で紫外線に曝露して部分的に光重合させることにより、重合率約10重量%の部分重合物(アクリル系ポリマーシロップ)を得た。このようにして得られたアクリル系ポリマーシロップの100重量部に、トリメチロールプロパントリアクリレート(TMPTA)0.02重量部、シランカップリング剤(商品名:KBM-403、信越化学工業(株)製)を0.3部添加した後、これらを均一に混合してモノマー成分を調製した。
温度計、攪拌機、還流冷却管及び窒素ガス導入管を備えたセパラブルフラスコに、モノマー成分として、ブチルアクリレート(BA)99部、4ヒドロキシブチルアクリレート(4HBA1部、重合開始剤としてアゾビスイソブチロニトリル0.2部及び重合溶媒として酢酸エチルを固形分が30%になるように投入した後、窒素ガスを流し、攪拌しながら約1時間窒素置換を行った。その後60℃にフラスコを加熱し、7時間反応させて重量平均分子量(Mw)110万のアクリル系ポリマーを得た。このアクリル系ポリマーの溶液(固形分100部)に、イソシアネート系架橋剤としてトリメチロールプロパンキシリレンジイソシアネート(三井化学(株)製「タケネートD110N」)0.1部、シランカップリング剤(信越化学(株)製「KBM-403」)0.1部を加えて粘着剤組成物(溶液)を調製した。このようにして調製した粘着剤溶液を、剥離シートの離型処理面に乾燥後の厚さが25μmとなるように塗布し、常圧下、60℃で1分間及び150℃で1分間加熱乾燥し、さらに23℃で120時間エージングを行って粘着剤層を作成した。
〈粘着剤A/高屈折率材料のナノ粒子分散液を使用する事例〉
(粘着剤A/ナノ粒子分散液(分散媒:エタノール)を使用した事例)
粘着剤層の厚さが150μmであって、該粘着剤層の両面が軽剥離PETシートで保護されている状態の粘着剤A(粘着剤層の屈折率:1.49)の一方の軽剥離PETシートを剥離した。露出した粘着剤層の表面に、高屈折率粒子を含有する分散液としてのジルコニア粒子(ZrO2、屈折率:2.17、平均一次粒子径:20nm)を含有する塗布用処理液(分散媒:エタノール、粒子濃度:1.5重量%、分散液の透過率:75%、CIKナノテック(株)製)を、屈折率調整区分の厚さが20nm~300nmになるようにバーコーターRDS No.5で塗布し、110℃の乾燥オーブンで180秒間乾燥させた。次いで、ジルコニア(ZrO2)粒子が分散された粘着剤層表面に、支持体としてPET剥離シートを貼り合わせ、粘着剤シートを得た。なお、このようにしてジルコニア粒子の平均一次粒子径を、TEM観察により計測した。
上記の事例と同様にして、下記の粘着剤及び高屈折率材料のナノ粒子分散液を使用して、同様に粘着剤シートを作製した。使用材料は、粘着剤B(屈折率1.48)、粘着剤C(屈折率1.47)、ZrO2ナノ粒子分散液(分散媒:n-プロパノール、粒径20nm)、ZrO2ナノ粒子分散液(分散媒:エタノール、粒径30nm)、及びZrO2ナノ粒子分散液(分散媒:n-プロパノール、粒径20nm)であった。
粘着剤層の厚さが150μmであって、該粘着剤層の両面が軽剥離PETシートで保護された状態の粘着剤A(粘着剤層の屈折率:1.49)の一方の軽剥離PETシートを剥離した。露出した粘着剤層の表面に、予め固形分濃度2重量%となるようにトルエンに溶解したスチレンオリゴマー溶液(屈折率:1.60、東亜合成製、UP-1150)を、屈折率調整層の厚さが20nm~300nmになるようにバーコーターRDS No.5で塗布し、110℃の乾燥オーブンで180秒間乾燥させた。次いで、スチレンを配置した粘着剤層表面に、支持体としてPET剥離シートを貼り合わせ、粘着剤シートを得た。
<粘着剤層の表面状態の観察>
実施例のそれぞれにおける粘着剤層の高屈折率材料粒子を有する側の表面を、FE-SEMを用いて、加速電圧2kV、観察倍率500倍、2,000倍、5,000倍、及び20,000倍で観察した。図8にその20,000倍写真を示す。高屈折率材料粒子が均一に分散されていることが分かる。
実施例の粘着剤層の高屈折率材料粒子を有する側の表面近傍の断面を、透過型電子顕微鏡(TEM)を用いて、倍率30,000倍で観察した。その結果を図9(a)(b)に示す。図9(a)では、屈折率調整用区分の厚みのほぼ全体にわたって高屈折率材料粒子がほぼ均一に分布しているが、図9(b)の例では、粘着剤層における高屈折率材料粒子の分布が、粘着剤層の表面で最も高く、粘着剤層の厚さ方向に従って減少していく分布を有することが分かる。
実施例及び比較例で得られた粘着層の平均表面屈折率を、分光エリプソメーター(EC-400、JA.Woolam製)を用いてナトリウムD線(589nm)における屈折率を測定した。実施例及び比較例の粘着層では、両面の剥離シートを剥離して、粒子を塗布していない面に黒板を貼り合わせた状態で、粒子が塗布されている面の平均屈折率を測定した。比較例の粘着シートでは、両方の剥離シートを剥離して、一方の面に黒板を貼り合わせた状態で、粘着剤層表面の平均屈折率を測定した。
粘着剤層の深さ方向の断面を調整し、TEM観察を行った。得られたTEM像(直接倍率3000~30000倍)から屈折率調整層の厚さの測定を計測した。屈折率調整層の厚みは、粘着剤ベース層との調整層との界面の凸凹の平均値とし、粘着剤ベース層との界面の判別が困難な場合には、表面TEM像を画像処理ソフト(ImageJ)で二値化画像処理し、ナノ粒子の90%が存在する領域の深さを調整層の厚みとした。
粘着剤層の粒子塗布側の表面を、FE-SEMを用いて、加速電圧2kV、観察倍率500倍、2,000倍、5,000倍で観察した。得られた表面SEM像を画像処理ソフト(ImageJ)で二値化画像処理することで、長辺23μm、短辺18μmの長方形領域における全体面積に対する面積として高屈折率粒子の占める面積比率(%)を求めた。
実施例及び比較例で得られた粘着シートでは、高屈折率材料を塗布した側の剥離シートを剥離して、スライドガラス(商品名:白研磨 No.1、厚さ:0.8~1.0mm、全光線透過率:92%、ヘイズ:0.2%、松浪硝子工業(株)製)に貼り合わせた。さらに他方の剥離シートを剥離して、ベース粘着剤層/粘着性の屈折率調整用層/スライドガラスの層構成を有する試験片を作製した。また、比較例の粘着シートでは、一方の剥離シートを剥離して、スライドガラス(商品名:白研磨 No.1、厚さ:0.8~1.0mm、全光線透過率:92%、ヘイズ:0.2%、松浪硝子工業(株)製)に貼り合わせ、さらに他方の剥離シートを剥離して、ベース粘着剤層/スライドガラスの層構成を有する試験片を作製した。上記試験片の可視光領域における全光線透過率、ヘイズ値を、ヘイズメーター(装置名:HM-150、(株)村上色彩研究所製)を用いて測定した。
実施例及び比較例で得られた粘着シートから、長さ100mm、幅20mmのシート片を切り出した。次いで、実施例及び比較例のシート片では、粒子が塗布されていない側の剥離シートを剥離して、PETフィルム(商品名:ルミラー S-10、厚さ:25μm、東レ(株)製)を貼付(裏打ち)した。また、比較例1、2のシート片では、一方の剥離シートを剥離して、PETフィルム(商品名:ルミラー S-10、厚さ:25μm、東レ(株)製)を貼付(裏打ち)した。次に、他方の剥離シートを剥離して、試験板としてのガラス板(商品名:ソーダライムガラス ♯0050、松浪硝子工業(株)製)に、2kgローラー、1往復の圧着条件で圧着し、試験板/粘着剤層/PETフィルムから構成されるサンプルを作製した。
高屈折率粒子を含有する分散液の透過率は、光電比色計(AC-114、OPTIMA社製)で530nmのフィルターを用いて測定した。分散溶媒単独の透過率を100%として、各実施例、比較例で使用した分散液の透過率(%)を測定した。
実施例及び比較例の光学部材積層体の一方の面を反射率測定面とし、反対側の面に片面粘着付黒色PET(PET75NBPET38、リンテック(株)製)を貼って反射率測定用の試料とした。光学部材積層体の反射率測定面側の反射率(Y値)を反射型分光光度計(U4100、(株)日立ハイテクノロジーズ製)により測定した。測定は、透明導電層をエッチングした部分と、エッチングしていない部分の双方の位置で行った。すなわち、透明導電層をエッチングした部分(開口部)の測定は、粘着剤層の屈折率調整層と光学部材積層体の屈折率調整層との界面の反射率であり、エッチングしていない部分(パターン部)の測定は、粘着剤層の屈折率調整層と透明導電層界面の反射率を示す。
反射抑制率(%)=反射率(%)-粒子がない場合の反射率(%)
[屈折率調整層付粘着剤と透明導電層の積層体の作製]
厚さ100μmのシクロオレフィンポリマーフィルム(商品名:「ゼオノアZF16」、面内複屈折率:0.0001、日本ゼオン(株)製)の両面に、直径3μmの複数の粒子(商品名:「SSX105」、積水樹脂(株)製)を、バインダー樹脂(商品名:「ユニディックRS29-120」、DIC社製)100部に対して0.07部添加した塗工液をバーコーターを用いて塗布し、80℃のオーブン下で1分間乾燥後、積算光量各300mJの紫外線(高圧水銀灯)を照射することで両面にアンチブロッキング層を有するフィルムを形成した(以下、COP基材)。次に、COP基材の片面に、屈折率調整剤(商品名:「オプスター KZ6661」、JSR(株)製)をバーコーターにより塗布し、80℃のオーブン下で1分間乾燥後、積算光量各300mJの紫外線(高圧水銀灯)を照射することで、厚さ100nm、屈折率1.65の屈折率調整層を形成した。得られたCOP基材の屈折率調整層の表面に、巻き取り式スパッタ装置において、透明導電層として厚さ23nmのインジウムスズ酸化物層(ITO)を積層した。
厚さ50μmのPETフィルム(商品名:「ルミラー:U40」東レ社製)の片面に直径3μmの複数の粒子(商品名:「SSX105」、積水樹脂(株)製)を、バインダー樹脂(商品名:「ユニディックRS29-120」、DIC社製)100部に対して0.1部添加した塗工液を、バーコーターを用いて塗布し、80℃のオーブン下1分間乾燥後、積算光量各300mJの紫外線(高圧水銀灯)を照射することで片面に膜厚1.5μmのアンチブロッキング層を形成した。次に、先ほど塗工した面とは逆面に、ハードコート用樹脂(商品名:「オプスター KZ7540(シリカナノ粒子含有)」、JSR(株)製)をMIBKで固形分10%になるように調整した塗工液を、バーコーターを用いて塗工し、80℃のオーブン下で1分間乾燥後、積算光量300mJの紫外線(高圧水銀灯)を照射することで膜厚1.5μmのハードコート層を有するフィルムを形成した(以下、PET基材)。
無アルカリガラス(屈折率1.53)の一方の面に、スパッタリング法によりITO膜を形成し、非結晶化ITO膜(屈折率1.85)を有する透明導電性基材を作製した。この非結晶性ITO薄膜のSn比率は、3重量%であった。なお、ITO薄膜のSn比率は、Sn原子の重量/(Sn原子の重量+In原子の重量)から算出した。
上記透明導電層上の一部にフォトレジスト膜を形成した後、これを25℃、5重量%の塩酸(塩化水素水溶液)に1分間浸漬して、透明導電層のエッチングを行った。これにより電極配線パターンに相当する透明導電層が存在する部分(パターン部)と、除去された部分(開口部)とを作製した。上述した粘着剤シートの高屈折率材料粒子を有する側のPET剥離シートを剥離し、パターニングされた透明導電層の上に、該粘着剤シートの粘着剤層(前記高屈折率粒子を有する側)と該透明導電層とが接触するように、該粘着剤シートを積層した。粘着剤シートの反対側のPET剥離シートを剥離した後に、表面保護及び光学測定のためにスライドガラスもしくは、厚さ100μmのシクロオレフィンポリマーフィルム(商品名:「ゼオノアZF16」、面内複屈折率:0.0001、日本ゼオン(株)製)を貼り合せた。
第2光学部材4として、図6(a)に示す積層体21と図6(b)に示す積層体31を準備した。図6(a)に示す積層体21は、屈折率1.53のCOP基材22の一表面上に屈折率1.65の屈折率調整層23が形成され、該屈折率調整層23の上に、パターン化されたITO層24が形成された構成である。ITOの屈折率は、1.9であった。この積層体21を「ITO付第2光学部材(1)」と呼ぶ。
さらに、図6(c)に示す「ITO付第2光学部材(3)」と呼ぶ積層体41を作製した。このITO付第2光学部材(3)の積層体41は、屈折率1.53のガラス基板42にパターン付けされていないITO層44を形成した構成である。
図7(a)に示すように、ITO付第2光学部材(1)を、本発明の一実施形態による粘着剤層25を介して第1光学部材2を構成するガラスウインドウ26に接合した。ガラスウインドウ26の屈折率は1.53であった。粘着剤層25は、粘着剤Aにより形成された屈折率1.49のベース粘着剤区分25aと、屈折率1.68の屈折率調整用区分25bを有するものであった。屈折率調整用区分25bは、平均粒径20nmの酸化ジルコニウム粒子をエタノール液に分散させた、酸化ジルコニウム粒子1.5wt%の分散液を、粘着剤Aからなる粘着剤層の表面に塗布し、酸化ジルコニウム粒子を粘着剤層の一方の表面から厚み方向に浸透させ、乾燥させることによって得られたものである。粘着剤層25の厚みは150μmであり、屈折率調整用区分25bの厚みは150nmであった。反射率測定のために、COP基材22の屈折率調整層23とは反対側の面である裏面には、黒色のPETフィルム27を貼った。このようにして得られた光学部材積層体の光学特性を測定した。結果を表1に示す。
図7(b)に示すように、ITO付第2光学部材(2)を、本発明の他の実施形態による粘着剤層35を介して第1光学部材2を構成するガラスウインドウ36に接合した。ガラスウインドウ26の屈折率は1.53であった。粘着剤層35は、粘着剤Bにより形成された屈折率1.48のベース粘着剤区分35aと、屈折率1.62の屈折率調整用区分35bを有するものであった。屈折率調整用区分35bは、平均粒径20nmの酸化ジルコニウム粒子をn‐プロパノール液に分散させた、酸化ジルコニウム粒子2.0wt%の分散液を、粘着剤Bからなる粘着剤層の表面に塗布し、酸化ジルコニウム粒子を粘着剤層の一方の表面から厚み方向に浸透させ、乾燥させることによって得られたものである。粘着剤層35の厚みは100μmであり、屈折率調整用区分35bの厚みは500nmであった。反射率測定のために、PET基材32の屈折率調整層33とは反対側の面である裏面には、黒色のPETフィルム37を貼った。このようにして得られた光学部材積層体の光学特性を測定した。結果を表1に示す。
図7(c)に示すように、ITO付第2光学部材(3)を、本発明のさらに他の実施形態による粘着剤層45を介して第1光学部材2を構成するウインドウ46に接合した。ウインドウ46は、ゼオノアフィルム(ZF14-100、登録商標)により作製した、屈折率1.53の透明部材である。粘着剤層45は、粘着剤Cにより形成された屈折率1.46のベース粘着剤区分45aと、屈折率1.70の屈折率調整用区分45bを有するものであった。屈折率調整用区分45bは、平均粒径30nmの酸化ジルコニウム粒子をエタノール液に分散させた、酸化ジルコニウム粒子1.5wt%の分散液を、粘着剤Cからなる粘着剤層の表面に塗布し、酸化ジルコニウム粒子を粘着剤層の一方の表面から厚み方向に浸透させ、乾燥させることによって得られたものである。粘着剤層45の厚みは25μmであり、屈折率調整用区分45bの厚みは200nmであった。反射率測定のために、ガラス基板42のITO層44とは反対側の面である裏面には、黒色のPETフィルム47を貼った。このようにして得られた光学部材積層体の光学特性を測定した。結果を表1に示す。
実施例1とは異なる構成の粘着剤層を使用して、図7(a)に示すものと同様な光学部材積層体を作製した。この実施例においては、ITO付第2光学部材(1)を、本発明のさらに別の実施形態による粘着剤層25を介して第1光学部材2を構成するガラスウインドウ26に接合した。ガラスウインドウ26の屈折率は1.53であった。粘着剤層25は、粘着剤Aにより形成された屈折率1.49のベース粘着剤区分25aと、屈折率1.65の屈折率調整用区分25bを有するものであった。屈折率調整用区分25bは、平均粒径20nmの酸化チタン粒子をn‐ブタノール液に分散させた、酸化チタン粒子0.5wt%の分散液を、粘着剤Aからなる粘着剤層の表面に塗布し、酸化チタン粒子を粘着剤層の一方の表面から厚み方向に浸透させ、乾燥させることによって得られたものである。この実施例における粘着剤層25の厚みは150μmであり、屈折率調整用区分25bの厚みは130nmであった。反射率測定のために、COP基材22の屈折率調整層23とは反対側の面である裏面には、黒色のPETフィルム27を貼った。このようにして得られた光学部材積層体の光学特性を測定した。結果を表1に示す。
屈折率1.60のスチレンオリゴマーを使用して屈折率調整用区分を形成することにより、図7(a)に示すものと同様な光学部材積層体を作製した。この実施例においては、ITO付第2光学部材(1)を、本発明のさらに別の実施形態による粘着剤層25を介して第1光学部材2を構成するガラスウインドウ26に接合した。ガラスウインドウ26の屈折率は1.53であった。粘着剤層25は、粘着剤Aにより形成された屈折率1.49のベース粘着剤区分25aと、屈折率1.55の屈折率調整用区分25bを有するものであった。屈折率調整用区分25bは、固形分として屈折率1.60のスチレンオリゴマーをトルエン液に分散させた固形分2wt%の分散液を、粘着剤Aからなる粘着剤層の表面に塗布し、固形分を粘着剤層の一方の表面から厚み方向に浸透させ、乾燥させることによって得られたものである。この実施例における粘着剤層25の厚みは150μmであり、屈折率調整用区分25bの厚みは300nmであった。反射率測定のために、COP基材22の屈折率調整層23とは反対側の面である裏面には、黒色のPETフィルム27を貼った。このようにして得られた光学部材積層体の光学特性を測定した。結果を表1に示す。
ITO付第2光学部材(1)を、粘着剤Aのみからなる粘着剤層を介して第1光学部材2を構成する屈折率1.53のガラスウインドウ26に接合して、比較例1の光学部材積層体を作製した。
ITO付第2光学部材(2)を、粘着剤Bのみからなる粘着剤層を介して第1光学部材2を構成する屈折率1.53のガラスウインドウ26に接合して、比較例2の光学部材積層体を作製した。
S1、S2・・・支持体
1・・・光学部材積層体
2・・・第1光学部材
3,13・・・透明な粘着剤層
3a、13a・・・ベース粘着剤区分
3b、13b・・・屈折率調整用区分
4・・・第2光学部材
7・・・透明導電性層
17・・・高屈折率材料粒子
19・・・分散液
20・・・粘着剤ベース材料
21、31・・・積層体
22・・・COP基材
23・・・屈折率調整層
24・・・ITO層
25・・・粘着剤層
26・・・ガラスウインドウ
Claims (16)
- 支持体と、該支持体上の透明な粘着剤層とからなる粘着剤シートであって、前記粘着剤層は、一方の主面から厚み方向にわたって透明な粘着剤ベース材料により本質的に形成されるベース粘着剤区分と、該粘着剤層の他方の主面から厚み方向にわたって形成された透明な粘着性の屈折率調整用区分とを含み、該屈折率調整用区分は、前記粘着剤ベース材料の屈折率より高い屈折率を有することを特徴とする粘着剤シート。
- 請求項1に記載した粘着剤シートであって、前記屈折率調整用区分は、厚みが20nm~600nmであることを特徴とする光学部材積層体。
- 請求項1又は請求項2に記載した粘着剤シートであって、前記屈折率調整用区分は、前記粘着剤ベース材料と同じ粘着性材料に、該粘着性材料より高い屈折率を有する高屈折率材料の粒子が分散されて該屈折率調整用区分の平均屈折率を高めるように構成されたことを特徴とする粘着剤シート。
- 請求項3に記載した粘着剤シートであって、前記高屈折率材料の粒子の屈折率は1.60~2.74であることを特徴とする粘着剤シート。
- 請求項3又は請求項4に記載した粘着剤シートであって、前記屈折率調整用区分の前記他方の主面には、前記高屈折材料の粒子が該他方の主面に露出する領域と、該屈折率調整用区分の粘着性材料が該他方の主面に露出するマトリクス領域とが形成されていることを特徴とする粘着剤シート。
- 請求項3から請求項5までのいずれか1項に記載した粘着剤シートであって、前記高屈折率材料は、TEM観察による平均一次粒子径が3nm~100nmであることを特徴とする粘着剤シート。
- 請求項3から請求項6までのいずれか1項に記載した粘着剤シートであって、前記高屈折率材料の粒子と前記粘着剤ベース材料の屈折率の差が0.15~1.34であることを特徴とする粘着剤シート。
- 請求項3から請求項7までのいずれか1項に記載した粘着剤シートであって、前記高屈折率材料は、TiO2、ZrO2、CeO2、Al2O3、BaTiO3、Nb2O5、及びSnO2からなる群から選択された1又は複数の化合物であることを特徴とする粘着剤シート。
- 請求項1又は請求項2に記載した粘着剤シートであって、前記屈折率調整用区分は、前記粘着剤ベース材料と同じ粘着性材料に該粘着性材料より高い屈折率を有する粒子、ポリマー又はオリゴマーの形態の有機材料が含まれることによって該屈折率調整用区分の平均屈折率を高めるように構成されたことを特徴とする粘着剤シート。
- 請求項9に記載した粘着剤シートであって、前記粘着剤ベース材料の屈折率は1.40~1.55であり、前記有機材料の屈折率は1.59~2.04であることを特徴とする光学部材積層体。
- 請求項1から請求項10までのいずれか1項に記載した粘着剤シートであって、前記粘着剤層の全光線透過率が80%以上であることを特徴とする粘着剤シート。
- 請求項3から請求項8までのいずれか1項に記載した粘着剤シートであって、前記高屈折率材料の粒子は、複数の粒子が凝集した凝集体の形態で存在する部分を含むことを特徴とする粘着剤シート。
- 請求項3から請求項12までのいずれか1項に記載した粘着剤シートであって、前記屈折率調整用区分は、前記粘着剤層の厚み方向に、不規則な深さで存在することを特徴とする粘着剤シート。
- 支持体上に、透明な粘着剤ベース材料により本質的に形成される粘着剤層を形成し、
前記粘着剤ベース材料より高い屈折率を有する屈折率調整材料を分散させた分散液を準備し、
前記粘着剤層の一方の面に前記分散液を塗布して、該塗工液に含まれる前記屈折率調整材料を、前記粘着剤層の前記一方の面から厚み方向に浸透させ、
前記粘着剤層を乾燥させることによって前記分散液の液体部分を蒸発させ、
前記粘着剤層の前記支持体とは反対側の表面に剥離シートを貼り合わせる
段階を含むことを特徴とする粘着剤シートの製造方法。 - 請求項13に記載した粘着剤シートの製造方法であって、前記屈折率調整用材料は、粘着性材料より高い屈折率を有する高屈折率材料の粒子であることを特徴とする粘着剤シートの製造方法。
- 請求項13に記載した粘着剤シートの製造方法であって、前記屈折率調整用材料は、粘着剤ベース材料より高い屈折率を有する粒子、ポリマー又はオリゴマーの形態の有機材料であることを特徴とする粘着剤シートの製造方法。
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| JP2015526816A JP6194358B2 (ja) | 2014-01-17 | 2015-01-16 | 透明な粘着剤層を有する粘着剤シート |
| KR1020157023867A KR101797081B1 (ko) | 2014-01-17 | 2015-01-16 | 투명한 점착제층을 가지는 점착제 시트 |
| US14/890,470 US10072184B2 (en) | 2014-01-17 | 2015-01-16 | Pressure-sensitive adhesive sheet having a transparent pressure-sensitive adhesive layer |
| CN201580000701.8A CN105189678B (zh) | 2014-01-17 | 2015-01-16 | 具有透明粘合剂层的粘合片 |
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| Publication number | Publication date |
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| CN105189678A (zh) | 2015-12-23 |
| US10072184B2 (en) | 2018-09-11 |
| TW201542749A (zh) | 2015-11-16 |
| JPWO2015108160A1 (ja) | 2017-03-23 |
| KR101797081B1 (ko) | 2017-11-13 |
| CN105189678B (zh) | 2018-09-18 |
| TWI600742B (zh) | 2017-10-01 |
| JP2017165984A (ja) | 2017-09-21 |
| US20160115357A1 (en) | 2016-04-28 |
| JP6194358B2 (ja) | 2017-09-06 |
| JP2020015915A (ja) | 2020-01-30 |
| JP2018159081A (ja) | 2018-10-11 |
| KR20150114548A (ko) | 2015-10-12 |
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