WO2016136436A1 - 粘着フィルム、粘着層付き透明面材、および表示装置 - Google Patents
粘着フィルム、粘着層付き透明面材、および表示装置 Download PDFInfo
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- WO2016136436A1 WO2016136436A1 PCT/JP2016/053566 JP2016053566W WO2016136436A1 WO 2016136436 A1 WO2016136436 A1 WO 2016136436A1 JP 2016053566 W JP2016053566 W JP 2016053566W WO 2016136436 A1 WO2016136436 A1 WO 2016136436A1
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- adhesive film
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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
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- C09J7/10—Adhesives in the form of films or foils without carriers
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- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
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- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
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- B32B17/06—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material
- B32B17/10—Layered products essentially comprising sheet glass, or glass, slag, or like fibres comprising glass as the main or only constituent of a layer, next to another layer of a specific material of synthetic resin
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- C08F—MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVING CARBON-TO-CARBON UNSATURATED BONDS
- C08F290/00—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups
- C08F290/02—Macromolecular compounds obtained by polymerising monomers on to polymers modified by introduction of aliphatic unsaturated end or side groups on to polymers modified by introduction of unsaturated end groups
- C08F290/06—Polymers provided for in subclass C08G
- C08F290/067—Polyurethanes; Polyureas
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- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
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- C08G18/08—Processes
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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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- 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
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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
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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
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- C—CHEMISTRY; METALLURGY
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- C—CHEMISTRY; METALLURGY
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Definitions
- the present invention relates to an adhesive film, a transparent surface material with an adhesive layer, and a display device.
- Patent Document 1 A display device in which a display panel and a protective plate are bonded via an adhesive film is known (see Patent Document 1).
- an autoclave treatment a treatment that is performed under high temperature and pressure after being bonded through an adhesive film has been performed.
- the present invention has been made in view of the above problems, and an object of the present invention is to provide a pressure-sensitive adhesive film in which bubbles generated at the bonding interface are likely to disappear under normal temperature and normal pressure when the pressure-sensitive adhesive film is used for bonding. To do.
- the pressure-sensitive adhesive film of the present invention is characterized by having one or more pressure-sensitive adhesive layers having the following requirements (a) to (c).
- (A) The diffusion coefficient of nitrogen gas is 1.5 ⁇ 10 ⁇ 6 cm 2 / sec or more.
- the transparent face material with an adhesive layer of the present invention is characterized by having one or more adhesive layers having the following requirements (a) to (c) on one main surface of the transparent face material.
- (A) The diffusion coefficient of nitrogen gas is 1.5 ⁇ 10 ⁇ 6 cm 2 / sec or more.
- C In the infrared absorption spectrum, it has an absorption peak at 800 to 820 cm ⁇ 1 and no absorption peak at 1000 to 1020 cm ⁇ 1 .
- the display device of the present invention is characterized in that a transparent surface material and a display panel are laminated via the adhesive film.
- a pressure-sensitive adhesive film in which bubbles disappear under normal pressure and a transparent surface material with a pressure-sensitive adhesive layer when bubbles are generated at the bonding interface when used at the time of bonding of face materials.
- a display device in which generation of bubbles is suppressed is provided.
- an adhesive layer having requirements (a) to (c) described below is referred to as an adhesive layer I, and the other adhesive layers are referred to as an adhesive layer II. Moreover, when referring both to the adhesion layer I and the adhesion layer II, it is only called the adhesion layer.
- the pressure-sensitive adhesive film of this embodiment has one or more pressure-sensitive adhesive layers I. From the viewpoint of ease of handling, the adhesive film is handled in a configuration in which the adhesive layer is sandwiched between a pair of protective films, or a configuration in which the adhesive layer is provided on one protective film and wound into a roll. It is. Thereby, the adhesion layer can be cut out and conveyed without touching the adhesion layer.
- the pressure-sensitive adhesive layer I of the present invention has the following requirements (a) to (c), that is, the characteristics (a) to (c).
- (A) The diffusion coefficient of nitrogen gas is 1.5 ⁇ 10 ⁇ 6 cm 2 / sec or more.
- C In the infrared absorption spectrum, it has an absorption peak at 800 to 820 cm ⁇ 1 and no absorption peak at 1000 to 1020 cm ⁇ 1 .
- the diffusion coefficient of nitrogen gas in the adhesive layer I is 1.5 ⁇ 10 ⁇ 6 cm 2 / sec or more, even if bubbles are generated at the bonding interface, the bubbles disappear in a short time.
- bubbles may be generated at the bonding interface.
- the present inventors eliminate bubbles generated at the bonding interface when the adhesive film is bonded to the bonded material in a short time. I found out.
- the diffusion coefficient of nitrogen gas in the adhesive layer I is preferably 1.55 ⁇ 10 ⁇ 6 cm 2 / sec or more, and particularly preferably 1.6 ⁇ 10 ⁇ 6 cm 2 / sec or more, from the viewpoint of excellent bubble disappearance characteristics. .
- the diffusion coefficient of nitrogen gas in the adhesive layer I is preferably 3.0 ⁇ 10 ⁇ 6 cm 2 / sec or less.
- the diffusion coefficient of nitrogen gas in the adhesive layer I is an unsteady state measured under the following condition 1 using a high-temperature and high-pressure gas permeability measuring device (for example, device name K-315-H manufactured by Tsukubarika Seiki Co., Ltd.) Is calculated by the equation 1 from the delay time t 0 and the thickness of the adhesive layer.
- a high-temperature and high-pressure gas permeability measuring device for example, device name K-315-H manufactured by Tsukubarika Seiki Co., Ltd.
- a sample obtained by attaching an adhesive layer to one side of a stretched polypropylene substrate having a thickness of 30 ⁇ m is used as a sample.
- the mass of nitrogen gas that has permeated through the sample sandwiched between the cells is analyzed with a mass analyzer, and the time course of mass is measured.
- Nitrogen gas is a high-purity product, the measurement temperature is 25 ° C., the pressure is 100 kPa, and the cell is ⁇ 50 mm.
- Nitrogen gas diffusion coefficient D N2 L 2 / (6 ⁇ t 0 )
- L is the thickness (unit: cm) of the adhesive layer.
- the air diffusion coefficient in the adhesive layer I is preferably 1.7 ⁇ 10 ⁇ 6 cm 2 / sec or more.
- the diffusion coefficient of air is more preferably 1.8 ⁇ 10 ⁇ 6 cm 2 / second or more, and further preferably 2 ⁇ 10 ⁇ 6 cm 2 / second or more.
- the air diffusion coefficient of the adhesive layer I is preferably 3 ⁇ 10 ⁇ 6 cm 2 / sec or less. If the air diffusion coefficient of the pressure-sensitive adhesive layer I exceeds 3 ⁇ 10 ⁇ 6 cm 2 / sec, the adhesion strength at the bonding interface of the pressure-sensitive adhesive layer I may be reduced.
- the air diffusion coefficient is measured under the same conditions as those for measuring the nitrogen gas diffusion coefficient except that the following condition 2 is used, using the same apparatus as that used for measuring the nitrogen gas diffusion coefficient.
- Condition 2 ⁇ Air is used, the measurement temperature is 25 ° C., the pressure is 100 kPa, and the cell is ⁇ 50 mm.
- the adhesive layer I more preferably has an oxygen gas diffusion coefficient of 1.9 ⁇ 10 ⁇ 6 cm 2 / sec or more. If the oxygen diffusion coefficient is 1.9 ⁇ 10 ⁇ 6 cm 2 / sec or more, most of the gas in the air diffuses quickly through the adhesive layer I, so that bubbles are formed at the interface between the adhesive film and the bonded product. Even if it occurs, bubbles disappear in a short time under normal pressure.
- Oxygen diffusion coefficient of the adhesive layer I is still more preferably 2 ⁇ 10 -6 cm 2 / sec or more, and particularly preferably 2.1 ⁇ 10 -6 cm 2 / sec or more.
- the diffusion coefficient of oxygen gas in the adhesive layer I is preferably 3 ⁇ 10 ⁇ 6 cm 2 / sec or less. When the diffusion coefficient of oxygen gas in the adhesive layer I exceeds 3 ⁇ 10 ⁇ 6 cm 2 / sec, the adhesive force at the bonding interface of the adhesive layer I may be reduced.
- the oxygen gas diffusion coefficient is measured under the same conditions as the conditions for measuring the nitrogen gas diffusion coefficient except that the following condition 3 is used, using the same apparatus as the nitrogen gas diffusion coefficient. (Condition 3) ⁇ High-purity oxygen gas is used, the measurement temperature is 25 ° C., the pressure is 100 kPa, and the cell is ⁇ 50 mm.
- the adhesive layer I has a shear modulus G ′ (1 Hz) at a measurement temperature of 25 ° C. and a frequency of 1 Hz of 5 ⁇ 10 2 to 1 ⁇ 10 5 Pa. Since the shear elastic modulus G ′ (1 Hz) of the pressure-sensitive adhesive layer I is in the above range, when the pressure-sensitive adhesive film of this embodiment is used for bonding, the shape of the pressure-sensitive adhesive layer I is maintained and the bonded material can be fixed. When the shear elastic modulus G ′ (1 Hz) is less than 5 ⁇ 10 2 Pa, the adhesive layer I is likely to be deformed, and even if the adhesive film is used for bonding, the bonded product may not be fixed.
- the shear modulus G ′ (1 Hz) of the adhesive layer I is more preferably 1 ⁇ 10 3 to 8 ⁇ 10 4 Pa, and further preferably 5 ⁇ 10 3 to 5 ⁇ 10 4 Pa. If the shear modulus G ′ (1 Hz) of the pressure-sensitive adhesive layer I is within this range, deformation of the pressure-sensitive adhesive layer I can be suppressed, and generation of bubbles at the interface between the object and the pressure-sensitive adhesive layer during bonding can be suppressed.
- the adhesive layer I has an absorption peak at 800 to 820 cm ⁇ 1 and no absorption peak at 1000 to 1020 cm ⁇ 1 in the infrared absorption spectrum.
- the absorption peak at 800 to 820 cm ⁇ 1 is an absorption band of out-of-plane bending vibration of the vinyl group C—H.
- the absorption peak of 1000 ⁇ of 1020 cm -1 (typically, the absorption peak 1010 cm -1) absorption band of the stretching vibration of Si-O-Si is. If the pressure-sensitive adhesive layer I has Si—O—Si bonds, the pressure-sensitive adhesive layer I may become cloudy when it comes into contact with humid air or water.
- the adhesive layer becomes cloudy when the display panel and the transparent surface material are bonded together, the quality of the display device is degraded.
- the absorption at 800 to 820 cm ⁇ 1 and the absorption at 1000 to 1020 cm ⁇ 1 can be confirmed by, for example, measuring an infrared absorption spectrum using a sample having an adhesive layer I attached to a sample folder.
- the glass transition temperature of the adhesive layer I is preferably ⁇ 65 ° C. or less. If the glass transition temperature of the adhesion layer I exists in this range, adhesive force with a bonding thing will become high at normal temperature.
- the glass transition temperature of the adhesive layer I is more preferably ⁇ 70 ° C. or lower.
- the adhesive layer I preferably has a tan ⁇ of 0.01 to 1.4 at a measurement temperature of 25 ° C. and a frequency of 1 Hz. If tan ⁇ is within this range, the bonded objects can be sufficiently fixed even if the bonded objects are arranged vertically. And it can prevent that the adhesion interface shift
- tan ⁇ is more preferably 0.05 to 1, and further preferably 0.1 to 0.8.
- the thickness of the adhesive layer I is not particularly limited, and can be freely designed according to the use of the adhesive film.
- the thickness is preferably about 0.1 to 2 mm, more preferably 0.15 to 1.5 mm. If the thickness of the adhesive layer I is 0.1 mm or more, when the protective plate and the display panel of the display device are bonded, the adhesive layer effectively buffers the impact caused by external force from the protective plate side, The display device body can be protected. In addition, even if foreign matter that does not exceed the thickness of the adhesive layer is mixed between the protective plate and the display panel of the display device, the thickness of the adhesive layer does not change significantly, and the light transmission performance is less affected. .
- the protective plate can be easily bonded to the display panel of the display device via the adhesive layer, and the overall thickness of the display device can be reduced.
- bonding the above-described protective plate and the display panel of the display device means bonding the above-described protective plate and the display surface of the display panel of the display device, that is, the image display surface. The same applies to the book.
- the adhesive layer I is preferably formed by curing a resin composition described below. Below, the component of a resin composition is demonstrated.
- the resin composition contains a curable component I having photocurability as an essential component.
- the curable component I contains, as an essential compound, a compound having an absorption peak at 800 to 820 cm ⁇ 1 corresponding to the absorption band of out-of-plane variable angular vibration of the vinyl group C—H.
- the resin composition preferably contains the following non-curable component II and photopolymerization initiator III.
- the curable component I includes at least one polymer A1 having a curable group and a number average molecular weight of 1,000 to 100,000, and at least one monomer A2 having a curable group and a molecular weight of 125 to 600. It is preferable to contain. When such a curable component I is used, it is easy to adjust the viscosity of the resin composition to a preferable range, and it is easy to produce the adhesive layer I.
- Examples of the curable group of the polymer A1 or the monomer A2 include addition polymerizable unsaturated groups (acryloyloxy group, methacryloyloxy group, etc.), combinations of unsaturated groups and thiol groups, and the like.
- the curable group is preferably an acryloyloxy group or a methacryloyloxy group from the viewpoint that the curing rate is high and the highly transparent adhesive layer I is obtained.
- the curable group in the polymer A1 and the curable group in the monomer A2 may be the same as or different from each other.
- the curable group of the polymer A1 and the monomer A2 is preferably a highly reactive acryloyloxy group.
- the number average molecular weight of the polymer A1 is preferably from 1,000 to 100,000, more preferably from 10,000 to 70,000. When the number average molecular weight of the polymer A1 is within this range, it is easy to adjust the viscosity of the resin composition within the above range.
- the number average molecular weight of the polymer A1 is a polystyrene-reduced number average molecular weight obtained by gel permeation chromatography (GPC) measurement. In the GPC measurement, when a peak of an unreacted low molecular weight component (monomer or the like) appears, the number average molecular weight is determined by excluding the peak.
- the polymer A1 preferably has an average of 2 to 4 curable groups per molecule.
- the polymer A1 include a urethane polymer having a urethane bond, poly (meth) acrylate of polyoxyalkylene polyol, and poly (meth) acrylate of polyester polyol.
- a urethane polymer is preferable because the mechanical properties of the resin after curing, the adhesiveness with a bonded product, and the like can be widely adjusted by the molecular design of the urethane chain.
- the urethane polymer can be synthesized by a method in which a polyol and polyisocyanate are reacted to obtain a prepolymer having an isocyanate group, and then a monomer is reacted with the isocyanate group of the prepolymer.
- the polyol and polyisocyanate include known compounds such as polyol i and diisocyanate ii described as raw materials for urethane-based polymer a described in WO2009 / 016943, and are incorporated in the present specification. .
- the content of the polymer A1 in the curable component I is preferably 1 to 90% by mass, and more preferably 5 to 80% by mass.
- the ratio of the polymer A1 is 1% by mass or more, the heat resistance of the adhesive layer I is good.
- the ratio of the polymer A1 is 90% by mass or less, the curability of the resin composition and the adhesiveness between the bonded product and the adhesive layer I are improved.
- the molecular weight of the monomer A2 is preferably 125 to 600. When the molecular weight of the monomer A2 is within this range, an adhesive layer I having good adhesion can be obtained.
- the molecular weight of the monomer A2 is preferably 140 to 400. From the viewpoint of controlling the curability of the resin composition and the mechanical properties of the adhesive layer I, the monomer A2 preferably has 1 to 3 curable groups per molecule.
- the content ratio of the monomer A2 in the curable component I is preferably 10 to 99% by mass, and more preferably 20 to 95% by mass.
- the monomer A2 can be broadly classified into a monomer A2 ′ having a curable group and a hydroxyl group and a monomer A2 ′ ′ having a curable group but no hydroxyl group.
- a monomer A2 ′ ′ having a curable group but not having a hydroxyl group at least one selected from alkyl acrylate having an alkyl group having 8 to 22 carbon atoms and alkyl methacrylate is preferable.
- the monomer A2 include n-decyl acrylate, n-dodecyl acrylate, n-dodecyl methacrylate, isooctadecyl acrylate, n-octadecyl methacrylate, n-behenyl methacrylate, and the like.
- N-decyl acrylate, n-dodecyl Acrylate and n-dodecyl methacrylate are preferred.
- the monomer A2 preferably contains a monomer A2 ′ having a curable group and a hydroxyl group.
- the compatibility of the non-curable component II can be increased when the resin composition contains the non-curable component II described later.
- monomer A2 ' is included, when the bonding thing is glass, since the adhesive force of the adhesion layer I and glass improves, it is preferable.
- Monomers A2 ′ include 2-hydroxypropyl acrylate, 2-hydroxybutyl acrylate, 4-hydroxybutyl acrylate, 6-hydroxyhexyl acrylate, 2-hydroxypropyl methacrylate, 2-hydroxybutyl methacrylate, 4-hydroxybutyl methacrylate, 6- Examples include hydroxyhexyl methacrylate. Of these, hydroxyacrylates having a hydroxyalkyl group having 2 to 8 carbon atoms are preferred, and 4-hydroxybutyl acrylate is particularly preferred.
- the content ratio of the monomer A2 ′ in the curable component I is preferably 10 to 60% by mass, and more preferably 20 to 50% by mass.
- the content ratio of the monomer A2 ′ is 10% by mass or more, the effects of improving the stability of the resin composition and improving the adhesion between the adhesive layer I and the bonded product are easily obtained.
- the content ratio of the monomer A2 ′ ′ in the curable component I is preferably 10 to 60% by mass, and more preferably 20 to 50% by mass.
- the content ratio of the monomer A2 ′ ′ is 10% by mass or more, the stability of the resin composition is easily improved, and the shear elastic modulus G ′ of the adhesive layer I is easily set in the range of 5 ⁇ 10 2 to 1 ⁇ 10 5 Pa.
- the non-curable component II is a component that does not undergo a curing reaction with the curable compound I when the curable component I of the resin composition is cured.
- the non-curable component II is preferably a polymer B containing a hydroxyl group.
- the number of hydroxyl groups per molecule of the polymer B is preferably 0.8 to 3, more preferably 1.8 to 2.3.
- the number average molecular weight of the polymer B is preferably 400 to 8000, more preferably 800 to 6000.
- compatibility with the curable component I in the resin composition can be increased.
- the adhesive layer I obtained by curing the resin composition can be made transparent.
- the polymer B may be used individually by 1 type, and may use 2 or more types together.
- polymer B examples include high molecular weight polyols, and polyoxyalkylene polyols, polyester polyols, and polycarbonate polyols are preferable.
- polyoxyalkylene polyol examples include polyoxyalkylene glycols such as polyoxyethylene glycol, polyoxypropylene glycol, polyoxypropylene glycol having a branched structure, and polyoxytetramethylene glycol.
- polyoxyalkylene polyols examples include aliphatic diol residues such as ethylene glycol, propylene glycol, and 1,4-butanediol, and aliphatic dicarboxylic acid residues such as glutaric acid, adipic acid, and sebacic acid. Based polyester diol.
- polycarbonate polyol examples include an aliphatic polycarbonate diol having a diol residue such as 1,6-hexanediol, and an aliphatic polycarbonate diol such as a ring-opening polymer of an aliphatic cyclic carbonate.
- a polyoxyalkylene polyol is preferably used as the polymer B, and a polyoxypropylene polyol is particularly preferable from the viewpoint of lowering the shear modulus G ′ of the adhesive layer I after curing. Further, a part of the oxypropylene group of the polyoxypropylene polyol may be substituted with an oxyethylene group.
- the polymer A1 is a urethane polymer synthesized using a polyoxyalkylene polyol and a polyisocyanate as raw materials
- the polymer B is a polyoxyalkylene polyol
- the non-curable component II When the non-curable component II is contained in the resin composition, there is an effect of further shortening the time during which bubbles generated at the bonding interface between the adhesive layer I and the bonded material disappear under normal pressure.
- the content of the non-curable component II in the resin composition is preferably 10 to 70 parts by mass with respect to the total mass (100 parts by mass) of the curable component I. If the content of the non-curable component II in the resin composition is within this range, the effect of eliminating bubbles can be sufficiently obtained, and the adhesive layer I can be sufficiently cured.
- the said content rate is a ratio of the total amount of the non-curable components II.
- Photopolymerization initiator III examples of the photopolymerization initiator III contained in the resin composition include acetophenone, ketal, benzoin or benzoin ether, phosphine oxide, benzophenone, thioxanthone, and quinone photopolymerization initiators. Among these, phosphine oxide and thioxanthone photopolymerization initiators are preferable, and phosphine oxide is particularly preferable in terms of suppressing coloring after the photopolymerization reaction. When performing a photopolymerization reaction by high-intensity light irradiation, it is preferable to use an acetophenone-based photopolymerization initiator because the curing rate can be increased.
- the content of the photopolymerization initiator III in the resin composition is preferably 0.01 to 10 parts by mass and more preferably 0.1 to 5 parts by mass with respect to the total mass (100 parts by mass) of the curable component I. .
- the resin composition includes a chain transfer agent, a polymerization inhibitor, a photocuring accelerator, a light stabilizer (ultraviolet absorber, radical Capture agents, etc.), antioxidants, flame retardants, adhesion improvers (silane coupling agents, etc.), pigments, dyes and other various additives.
- a polymerization inhibitor an antioxidant and the like.
- the total mass of these additives is preferably 0 to 10 parts by mass and more preferably 0 to 5 parts by mass with respect to the total mass (100 parts by mass) of the curable component I.
- the chain transfer agent is a compound that receives radicals from a polymer that grows by radical polymerization and functions to suppress the elongation of the polymer. Therefore, the molecular weight of the curable component after curing can be adjusted by containing a chain transfer agent as an additive of the resin composition and adjusting the content of the chain transfer agent.
- chain transfer agent examples include compounds having a thiol group (n-octyl mercaptan, n-dodecyl mercaptan, 1,4-bis (3-mercaptobutyryloxy) butane, pentaerythritol tetrakis (3-mercaptobutyrate), etc. Is mentioned.
- the polymerization inhibitor is a compound that functions to receive radicals from a polymer that grows by radical polymerization and stop the reaction.
- a polymerization inhibitor as an additive of the resin composition and making its content less than the polymerization initiator, the stability of the resin composition can be improved and the molecular weight after curing can also be adjusted.
- the polymerization inhibitor include 2,5-di-tert-butylhydroquinone, mono-t-butylhydroquinone, pt-butylcatechol and the like.
- antioxidants When an antioxidant is included as an additive of the resin composition, the stability of the cured resin composition can be improved.
- Commercially available antioxidants that can be added to the resin composition include Irganox 1010, Irganox 1035, Irganox 1076, Irgastab PUR68, Adekastab, PEP-8, and PEP-36 / 36A manufactured by ADEKA manufactured by BASF.
- FIG. 1 is a front view of an adhesive film 10 in a form in which the adhesive layer 20 is sandwiched between protective films 30 and 31, and FIG. 2 is a cross-sectional view taken along the line II in FIG.
- the pressure-sensitive adhesive layer may have at least one pressure-sensitive adhesive layer I, and may have two or more pressure-sensitive adhesive layers.
- the adhesive film from which physical properties, such as adhesive force, differ in the surface layer and back layer of an adhesion layer, for example is obtained.
- FIG 3 is a cross-sectional view of a form having two adhesive layers, and shows the adhesive film 11 in a form in which the adhesive layers 21 and 22 are sandwiched between the protective films 30 and 31.
- the adhesive layers 21 and 22 may be the adhesive layer I, and both are preferably the adhesive layer I.
- the total thickness of the pressure-sensitive adhesive layer can be freely set according to the application to be bonded using the pressure-sensitive adhesive film.
- the thickness of the entire adhesive layer is preferably 0.15 to 2 mm, more preferably 0.3 to 1.5 mm. . If the thickness of the entire adhesive layer is 0.15 mm or more, when the protective plate and the display panel of the display device are bonded, the adhesive layer effectively buffers the impact due to external force from the protective plate side, The display device body can be protected.
- the thickness of the adhesive layer does not change significantly, which affects the light transmission performance. Few. If the thickness of the entire adhesive layer is 2 mm or less, the protective plate can be easily bonded to the display panel of the display device via the adhesive layer, and the entire thickness of the display device can be reduced. (Protective film)
- the pressure-sensitive adhesive layer is preferably in a form in contact with the protective film or a form in which the pressure-sensitive adhesive layer is sandwiched between the protective films. This facilitates, for example, processing, transport and storage of the adhesive layer.
- the protective film preferably has a release agent on the surface of the substrate that contacts the adhesive layer.
- the release agent include silicone resin.
- the protective films in contact with the surface layer and the back layer of the laminate of the adhesive layer may be the same or different. When the adhesive film is bonded, in order to peel off the desired surface layer side, it is preferable to use a different protective film and make a difference in the adhesion between the protective film and the adhesive layer.
- Examples of the method of giving a difference in adhesion include a method of changing the thickness of the release layer of the protective film and a method of changing the type of the release agent of the protective film. These can be freely designed according to the use etc. which use an adhesive film.
- films such as PET (Polyethylene Terephthalate), polyethylene, polypropylene, and fluorine resin can be used.
- the substrate thickness of the protective film varies depending on the resin used, and when a PET film is used, it is preferably 0.025 mm to 0.175 mm, and more preferably 0.038 mm to 0.125 mm. When a polyethylene film or a polypropylene film is used, the thickness is preferably 0.04 mm to 0.2 mm, more preferably 0.06 mm to 0.1 mm.
- the protective film preferably does not transmit gas (oxygen gas, nitrogen gas, water vapor, etc.) from the outside.
- the gas permeability of the protective film is preferably 100 cc / m 2 ⁇ day ⁇ atm or less.
- gas permeation can be reduced by providing a barrier layer of an inorganic compound film such as alumina on the substrate.
- the method for producing an adhesive film of the present embodiment is a method for producing a single-layer adhesive layer I using one type of resin composition, and has at least one adhesive layer I using two or more types of resin compositions. Examples thereof include a method for producing two or more adhesive layers.
- the adhesive layer can be produced, for example, by applying a resin composition to a protective film and irradiating light to cure the resin composition.
- a production example of the pressure-sensitive adhesive film a method for producing the pressure-sensitive adhesive film 10 having one pressure-sensitive adhesive layer I using the manufacturing apparatus 100 shown in FIG. 4 will be described.
- the manufacturing apparatus 100 includes a first unwinding roll 50, a second unwinding roll 51, a coating die 40, a bonding roll 53, a curing unit 60, and a first winding roll 52. Is provided.
- the protective film 30 is sequentially unwound from the unwinding roll 50, and the first resin composition is continuously applied to the protective film 30 with the coating die 40. Then, the protective film 31 is sequentially unwound from the unwinding roll 51, and the protective film 31 is bonded to the first resin composition by the bonding roll 53.
- the first resin composition is cured by irradiating light at the curing unit 60 to form an adhesive layer (an adhesive layer corresponding to the adhesive layer 20 in FIG. 6).
- an adhesive layer an adhesive layer corresponding to the adhesive layer 20 in FIG. 6.
- the curing unit 60 includes a chamber 61 and a light source 62 disposed in the chamber 61.
- the number of light sources is one, but the number of light sources may be two or more.
- the light source 42 is a light source that can irradiate ultraviolet rays.
- one or more light sources selected from the group consisting of a high-pressure mercury lamp, a metal halide lamp, and an LED can be used.
- the position of the light source 62 may be on the protective film 30 side or on the surface side on which the resin composition is applied.
- the atmosphere in the chamber 61 is not particularly limited. If the inside of the chamber 61 is set to an inert gas atmosphere, when the resin composition described above is irradiated with ultraviolet rays (light irradiation) to cause a curing reaction, radicals generated in the resin composition by the ultraviolet irradiation are deactivated by oxygen. Since reaction can be suppressed, it is preferable.
- the inert gas atmosphere for example, the inside of the chamber 41 is preferably filled with nitrogen and the oxygen concentration is preferably 100 ppm or less.
- the manufacturing apparatus 110 includes a first unwinding roll 50, a second unwinding roll 51, a first coating die 40, a first curing unit 60, and a second coating die 41.
- the second curing unit 63 and the first winding roll 52 are provided.
- the protective film 30 is sequentially unwound from the unwinding roll 50, and the first resin composition is continuously applied to the protective film 30 in a strip shape by the first coating die 40. Then, the first resin composition is cured by irradiating light with the first curing unit 60 to form an adhesive layer (an adhesive layer corresponding to the adhesive layer 21 in FIG. 7).
- the second resin composition is continuously applied in a strip shape to the adhesive layer 21 with the second coating die 41.
- the protective film 31 is sequentially unwound from the unwinding roll 51, and the protective film 31 is bonded to the second resin composition by the bonding roll 53.
- the second curing unit 63 is irradiated with light to cure the second resin composition, thereby forming an adhesive layer (an adhesive layer corresponding to the adhesive layer 22 in FIG. 7).
- an adhesive layer an adhesive layer corresponding to the adhesive layer 22 in FIG. 7.
- the first resin composition and the second resin composition may use the same composition or different compositions. If the first and second resin compositions have the same composition, an adhesive film having a thick adhesive layer can be produced. If different compositions are used, adhesive films having different physical properties between the front layer and the back layer can be produced. Moreover, the coating thickness of the resin composition applied by the first coating die and the second coating die may be the same or different. The coating thickness is appropriately adjusted according to the design of the pressure-sensitive adhesive film to be manufactured.
- the atmosphere and light irradiation conditions of the first curing unit 60 and the second curing unit 63 are the same as those of the curing unit of the manufacturing apparatus 100.
- the first curing unit 60 and the second curing unit 63 may have the same atmosphere and light irradiation conditions, or may be different.
- the positions of the light sources 62 and 65 may be on the protective film 30 side or on the surface side on which the resin composition is applied.
- the pressure-sensitive adhesive film As another production example of the pressure-sensitive adhesive film, there is a method in which two or more pressure-sensitive adhesive films 10 manufactured by the manufacturing apparatus 100 shown in FIG. 4 are prepared, one protective film of each pressure-sensitive adhesive film 10 is peeled off, and these are laminated. It is done. If the resin composition of the pressure-sensitive adhesive layer of the pressure-sensitive adhesive film to be prepared has the same composition, the pressure-sensitive adhesive layer can be made thick with a single physical property, and if different compositions are used, pressure-sensitive adhesive films having different physical properties between the surface layer and the back layer can be produced.
- the adhesive film is cut into a desired size and used according to the application.
- a laser cutter or a rotary blade can be used for cutting the adhesive film.
- the adhesive film is soft and the shear modulus is less than 100 kPa, it is preferable to use a laser cutter from the viewpoint of preventing reattachment after cutting.
- the transparent surface material with an adhesive layer 80 of the present embodiment has one or more adhesive layers 20 on the transparent surface material 81.
- 6 and 7 show a transparent surface material with an adhesive layer that uses a transparent surface material 81 as a protective plate of the display device described below, and the adhesive layer 20 is formed on the transparent surface material 81 having a light-shielding printing portion 82 at the periphery. 1 or more layers, and the protective layer 31 is provided on the surface opposite to the transparent surface material 81 of the adhesive layer 20.
- At least one of the adhesive layers of the transparent surface material with the adhesive layer of the present embodiment is the adhesive layer I.
- at least one layer may be the adhesive layer I, and all are preferably the adhesive layer I.
- each adhesive layer may be the same or different.
- the transparent face material has transparency, and the plan view shape and the cross-sectional shape are not limited.
- the shape in plan view is designed according to the application to be used, such as a rectangle and a periphery having a straight line and a curve.
- Examples of the cross-sectional shape include a linear shape (that is, a rectangular cross-sectional shape), a curved shape, or a combination of a linear shape and a curved shape in which the central portion is a straight shape and the end portion is a curved shape.
- the material of the transparent face material includes glass and transparent resin.
- the glass material include soda lime glass and aluminosilicate glass.
- the glass for example, highly transmissive glass or tempered glass can be used. Particularly when a thin transparent surface material is used, glass subjected to chemical strengthening is preferable.
- the transparent resin material include highly transparent resin materials (acrylic resins such as polycarbonate and polymethyl methacrylate).
- the thickness of the transparent face material is preferably 0.5 to 25 mm for a glass plate, and preferably 2 to 10 mm for a transparent resin plate.
- the transparent surface material may be subjected to a surface treatment in order to improve the interfacial adhesive force with the transparent surface material of the adhesive layer.
- a surface treatment method include a method of treating the surface of the transparent surface material with a silane coupling agent, a method of forming a silicon oxide thin film by an oxidation flame using a frame burner, and the like.
- the said transparent surface material can be conveniently used as a protective plate used for protection of the display panel of a display apparatus.
- a protective plate in addition to being transparent to the light emitted from the display panel and reflected light, it has light resistance, low birefringence, plane accuracy, surface scratch resistance, and high mechanical strength.
- the material of the protective plate is preferably a glass plate.
- an antireflection layer When used as a protective plate, an antireflection layer may be provided on the surface opposite to the surface on which the adhesive layer of the protective plate is formed in order to increase the contrast of the display image.
- the antireflection layer include a method in which an inorganic thin film having a low refractive index is directly formed on the surface of the protective plate, and a method in which a transparent resin film provided with the antireflection layer is bonded to the protective plate.
- Part or all of the protective plate is colored, or part of or the entire surface of the protective plate is polished to form a glass to scatter light, or fine irregularities are formed on part or all of the surface of the protective plate.
- the transmitted light may be refracted or reflected.
- you may stick a coloring film, a light-scattering film, a photorefractive film, a light reflection film, etc. to a part or all of the surface of a protective plate.
- the thickness of the protective plate when the transparent surface material is used as the protective plate is preferably 0.5 to 6 mm for the purpose of reducing the weight of the display device in applications such as television receivers and PC displays, and is installed outdoors. For public display applications, 3-20 mm is preferred. When chemically strengthened glass is used as the protective plate, the thickness of the protective plate is preferably about 0.4 to 1.5 mm.
- the protective plate is provided with a light-shielding portion at the periphery of the protective plate (transparent surface material) so that the area other than the image display area of the display panel cannot be seen from the protective plate side, that is, transparent as shown in FIGS. It is preferable to provide a light-shielding printing part 82 at the peripheral part of the face material 81. Thereby, the wiring member etc. which are connected to the display panel can be concealed.
- the light shielding part is preferably formed on the surface of the protective plate on which the adhesive layer is formed.
- Examples of the method for forming the light shielding part include a method of printing a ceramic paint containing a black pigment, a method of attaching a transparent film provided with a light shielding part in advance, and the like.
- a method for producing a transparent surface material with an adhesive layer of the present embodiment a method for producing an adhesive film by transferring an adhesive film to the transparent surface material, a resin composition is directly coated on the transparent surface material, and this is cured and adhered. Examples include a method of forming a layer.
- the adhesive film of this embodiment is cut into a desired size, and one or more of these are transferred to the transparent surface material. And a method of pasting the adhesive film of the present embodiment in advance, cutting it into a desired size, and transferring it to a transparent surface material.
- Examples of the method of directly forming the adhesive layer by coating the resin composition on the transparent surface material include a die coating method or a method using a dispenser. After the resin composition is applied to the transparent surface material, a protective film is bonded to the resin composition and cured by irradiating with ultraviolet rays to form an adhesive layer.
- the method and conditions for irradiating ultraviolet rays are preferably the same methods and conditions as those for ultraviolet irradiation in the method for producing an adhesive film of the present embodiment.
- the pressure-sensitive adhesive film of the present invention is suitably used when a laminate is produced by bonding face materials together.
- a laminated glass can be manufactured by bonding together a pair of glass plates using an adhesive film.
- a protective plate and a display panel can be bonded together using an adhesive film, and a display apparatus can be manufactured.
- the transparent surface material with the adhesion layer of this invention can be used when bonding together to a display panel and manufacturing a display apparatus, for example.
- a display apparatus is demonstrated as an example which uses an adhesive film and the transparent surface material with an adhesion layer.
- FIG. 8 is a cross-sectional view illustrating an example of an embodiment of a display device.
- a display panel 90 and a protective plate 81 that is, a transparent surface material
- an adhesive layer 20 interposed therebetween.
- the adhesive layer I is used as the adhesive layer 20 of the present embodiment.
- a transparent substrate 92 provided with a color filter and a transparent substrate 94 provided with a TFT (thin film transistor) are bonded via a liquid crystal layer 96 and sandwiched between a pair of polarizing plates 98. It is the liquid crystal panel of a structure.
- the pressure-sensitive adhesive film of the present embodiment having protective films on both sides is prepared, one protective film is peeled off, and bonded to a transparent surface material as the protective plate 81, A method of peeling off the other protective film and bonding it to the display surface of the display panel can be mentioned. Moreover, the method of preparing the transparent surface material with the adhesion layer of this embodiment, peeling off a protective film and bonding and manufacturing to the display surface of a display panel is mentioned.
- Examples 1 to 5 are examples of the present invention, and examples 6 and 7 are comparative examples.
- Example 1 A resin composition for forming an adhesive layer was produced as follows. Bifunctional polypropylene glycol having a molecular end modified with ethylene oxide (number average molecular weight calculated from hydroxyl value: 4000) and isophorone diisocyanate were mixed at a molar ratio of 4: 5, and in the presence of a tin compound catalyst, 70 A prepolymer was obtained by reaction at 0 ° C. This prepolymer and 2-hydroxyethyl acrylate were mixed at a molar ratio of approximately 1: 2, and reacted at 70 ° C. to obtain a urethane acrylate polymer (hereinafter abbreviated as UA). The number of curable groups of UA was 2, the number average molecular weight was about 24,000, and the viscosity at 25 ° C. was about 830 Pa ⁇ s.
- UA urethane acrylate polymer
- a bifunctional polypropylene glycol (number average molecular weight: 4000) whose molecular terminal is modified with ethylene oxide and a bifunctional polypropylene glycol (number average molecular weight: 7000) whose molecular terminal is modified with ethylene oxide are prepared. did. This was added to and mixed with the mixture at a mass part ratio shown in Table 1 with respect to 100 parts by mass of the curable component I to obtain a resin composition 1.
- a silicone sheet (thickness 0.5 mm) having a hollowed central portion was placed on a release PET film (150 mm ⁇ 150 mm, thickness 125 ⁇ m) as a protective film, and the resin composition 1 was applied to the central portion by bar coating. .
- a release PET film (150 mm ⁇ 150 mm, thickness 75 ⁇ m) was overlaid on the resin composition 1.
- the laminate was irradiated with ultraviolet rays with a mercury lamp (integrated light quantity 1500 mJ / cm 2 ) to cure the resin composition 1, thereby obtaining an adhesive film 1 having one adhesive layer.
- the thickness of the adhesive layer was 0.5 mm.
- Example 2 Resin composition 2 was obtained in the same manner as in Example 1 except that the proportion by mass of each component of the resin composition was as described in Table 1. Using the resin composition 2, an adhesive film 2 having one adhesive layer was obtained in the same manner as in Example 1.
- Example 3 The polymerization initiator III was changed to 1-hydroxycyclohexyl phenyl ketone (product name IRGACURE 184, manufactured by BASF), the antioxidant was changed to product name IRGASTAB PUR68, manufactured by BASF, and the ultraviolet absorber and the non-curable component II were changed.
- Resin composition 3 was obtained in the same manner as in Example 1 except that the proportion by mass of each component was as described in Table 1 without using.
- a pressure-sensitive adhesive film 3 having one pressure-sensitive adhesive layer was obtained in the same manner as in Example 1.
- Example 4 Resin composition 4 was obtained in the same manner as in Example 3 except that non-curable component II was used and the proportion by mass was as shown in Table 1. Using the resin composition 4, a pressure-sensitive adhesive film 4 having one pressure-sensitive adhesive layer was obtained in the same manner as in Example 1.
- Example 5 A resin composition 5 was obtained in the same manner as in Example 3 except that the mass parts ratio shown in Table 1 was used. Using the resin composition 5, an adhesive film 5 having one adhesive layer was obtained in the same manner as in Example 1.
- Example 6 Three commercially available highly transparent pressure-sensitive adhesive films having a thickness of 0.175 mm (manufactured by 3M, trade name CEF03A07) were stacked to obtain a pressure-sensitive adhesive film 6 having three pressure-sensitive adhesive layers.
- Example 7 Three commercially available highly transparent adhesive films with a thickness of 0.175 mm (trade name CEF0507, manufactured by 3M) were stacked to obtain an adhesive film 7 having three adhesive layers.
- Mass spectrometer analyzes time changes in nitrogen gas, oxygen gas, and air pressure introduced through a sample sandwiched between cells by introducing nitrogen gas, oxygen gas, or air from the OPP substrate side at 25 ° C. and 100 kPa A transmission curve was obtained.
- the diffusion coefficient D of nitrogen, oxygen, and air was calculated from the delay time t 0 in the unsteady state of the obtained permeation curve according to Equation 2, respectively.
- the delay time t 2 in the non-steady state transmission curve of the sample of OPP substrate was set as the delay time t 0 .
- D L 2 / (6 ⁇ t 0 ) ... Formula 2
- L is the film thickness (unit: cm) of the adhesive layer.
- each diffusion coefficient (cm 2 / sec) is expressed in units of “cm 2 / sec”.
- the shear modulus and loss tangent (tan ⁇ ) of the adhesive layer were measured as follows using a trade name ARES-G2 rheometer manufactured by TA Instruments. A parallel plate of 25 mm was used at 25 ° C., a frequency of 0.01-100 Hz, a strain of 3%. The shear modulus and loss tangent (tan ⁇ ) at a frequency of 1 Hz were taken as the shear modulus and loss tangent (tan ⁇ ) at 25 ° C.
- Example 6 and 7 do not laminate
- Glass transition temperature measurement The glass transition temperatures of the adhesive layers of the adhesive films 1 to 7 were measured using a product name DVA-200 manufactured by IT Measurement & Control Co., Ltd. Measurement temperature is -120 to 180 ° C, heating rate is 3 ° C / min, frequency is 1 Hz, low temperature side tangent of tensile dynamic elastic modulus E 'on the chart of temperature change of tensile dynamic elastic modulus E' And the intersection of the tangents in the region where the tensile dynamic elastic modulus E ′ elastic modulus drops sharply was defined as the glass transition temperature of the adhesive layer.
- a glass plate (dimensions: 55 mm ⁇ 120 mm ⁇ 0.7 mm, opening 49 mm ⁇ 90 mm) having a light-shielding printing portion having a height of 80 ⁇ m at the periphery was prepared.
- one release PET of the adhesive films 1 to 7 was peeled off and pasted to obtain glass plates 1 to 7 with an adhesive layer.
- the other release PET is peeled from the glass plates 1 to 7 with the adhesive layer, and the adhesive layer is placed on the surface of the polarizing plate of glass with a polarizing plate having a thickness of 0.2 mm (53 mm ⁇ 96 mm, thickness 0.7 mm).
- the adhesive layers of the adhesive films of Examples 1 to 7 are not shown in the table, but all have an absorption peak at 800 to 820 cm ⁇ 1 and an absorption peak at 1000 to 1020 cm ⁇ 1 in the infrared absorption spectrum. I didn't.
- the pressure-sensitive adhesive films of Examples 1 to 5 have a nitrogen gas diffusion coefficient and shear modulus G ′ (1 Hz) in the pressure-sensitive adhesive layer within a predetermined range and a high nitrogen gas diffusion coefficient. The bubbles generated in disappeared in a short time.
- Example 6 using the conventional adhesive film although the shear elastic modulus G ′ (1 Hz) of the adhesive layer is in a predetermined range, the diffusion coefficient of nitrogen gas in the adhesive layer is low, so Bubbles generated at the interface did not disappear after 168 hours.
- Example 7 since the diffusion coefficient of nitrogen gas in the adhesive layer was low and the shear modulus G ′ (1 Hz) of the adhesive layer was also high, bubbles generated at the interface between the adhesive layer and the polarizing plate passed for 168 hours. It did not disappear at that time.
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Abstract
Description
(a)窒素ガスの拡散係数が1.5×10-6cm2/秒以上。
(b)測定温度25℃、周波数1Hzにおけるせん断弾性率G’(1Hz)が5×102~1.0×105Pa。
(c)赤外線吸収スペクトルにおいて、800~820cm-1に吸収ピークを有し、1000~1020cm-1に吸収ピークを有さない。
(a)窒素ガスの拡散係数が1.5×10-6cm2/秒以上。
(b)測定温度25℃、周波数1Hzにおけるせん断弾性率G’(1Hz)が5×102~1.0×105Pa。
(c)赤外線吸収スペクトルにおいて、800~820cm-1に吸収ピークを有し、1000~1020cm-1に吸収ピークを有さない。
また、本発明の表示装置は、透明面材と表示パネルとが上記粘着フィルムを介して積層されていることを特徴とする。
なお、本発明の範囲は、以下の実施の形態に限定されるものではなく、本発明の技術的思想の範囲内で任意に変更できる。また、以下の図面においては、各構成をわかりやすくするために、実際の構造と各構造における縮尺や数等が異なる場合がある。
本実施形態の粘着フィルムは、粘着層Iを1層以上有する。粘着フィルムは、取り扱い易さの観点から、1対の保護フィルムで粘着層が挟持された構成、または、1枚の保護フィルム上に粘着層を有しロール状に巻き取られた構成等で取り扱われる。これにより、粘着層に触れることなく粘着層の切り出しや搬送を行える。
本発明の粘着層Iは、下記(a)~(c)の要件、すなわち(a)~(c)の特性を備える。
(a)窒素ガスの拡散係数が1.5×10-6cm2/秒以上。
(b)測定温度25℃、周波数1Hzにおけるせん断断弾性率G’(1Hz)が5×102~1.0×105Pa。
(c)赤外線吸収スペクトルにおいて、800~820cm-1に吸収ピークを有し、1000~1020cm-1に吸収ピークを有さない。
・厚さ30μmの延伸ポリプロピレン基材の片面に粘着層を貼り付けたものを試料とする。
・試料をセルに挟み、基材側から窒素ガスを導入する。
・セルに挟んだ試料を介して透過してきた窒素ガスの質量を質量分析器で分析し、質量の時間経過を測定する。
・窒素ガスは高純度品を使用し、測定温度は25℃、圧力は100kPa、セルはφ50mmを用いる。
・式1:窒素ガスの拡散係数DN2=L2/(6×t0)
ただし、遅れ時間t0は、試料の透過曲線の非定常状態での遅れ時間t1から、基材のみの透過曲線の非定常状態での遅れ時間t2を引いた値(t0=t1-t2)であり、Lは粘着層の膜厚(単位:cm)である。
(条件2)
・空気を使用し、測定温度は25℃、圧力は100kPa、セルはφ50mmを用いる。
(条件3)
・酸素ガスは高純度品を使用し、測定温度は25℃、圧力は100kPa、セルはφ50mmを用いる。
なお、上記800~820cm-1の吸収、及び1000~1020cm-1の吸収は、例えば粘着層Iを試料フォルダに貼付した試料を用いて赤外線吸収スペクトル測定を行うことで確認できる。
粘着層Iは、以下で説明する樹脂組成物を硬化して形成されることが好ましい。以下に、樹脂組成物の成分について説明する。
樹脂組成物は、光硬化性を有する硬化性成分Iを必須成分として含む。硬化性成分Iは、ビニル基C-Hの面外変角振動の吸収バンドに相当する800~820cm-1に吸収ピークを有する化合物を必須化合物として含む。
樹脂組成物は、下記する非硬化性成分IIおよび光重合開始剤IIIを含むことが好ましい。
硬化性成分Iは、硬化性基を有し、数平均分子量が1000~100000であるポリマーA1の1種以上と、硬化性基を有し分子量が125~600であるモノマーA2の1種以上とを含むことが好ましい。このような硬化性成分Iを用いると、樹脂組成物の粘度を好ましい範囲に調整しやすく、粘着層Iを製造しやすい。
硬化反応に必要な時間を短縮させるため、ポリマーA1とモノマーA2の硬化性基を反応性の高いアクリロイルオキシ基とすることが好ましい。
ポリマーA1の数平均分子量は、1000~100000が好ましく、10000~70000がより好ましい。ポリマーA1の数平均分子量がこの範囲であると、樹脂組成物の粘度を前記範囲に調整しやすい。ポリマーA1の数平均分子量は、ゲル浸透クロマトグラフィー(GPC)の測定によって得られた、ポリスチレン換算の数平均分子量である。なお、GPCの測定において、未反応の低分子量成分(モノマー等)のピークが現れる場合は、ピークを除外して数平均分子量を求める。
ポリマーA1としては、ウレタン結合を有するウレタンポリマー、ポリオキシアルキレンポリオールのポリ(メタ)アクリレート、ポリエステルポリオールのポリ(メタ)アクリレート等が挙げられる。ウレタン鎖の分子設計等によって硬化後の樹脂の機械的特性、貼合物との密着性等を幅広く調整できる点から、ウレタンポリマーが好ましい。
モノマーA2の分子量は、125~600が好ましい。モノマーA2の分子量がこの範囲にあれば、密着性が良好な粘着層Iが得られる。モノマーA2の分子量は、140~400が好ましい。モノマーA2は、樹脂組成物の硬化性、粘着層Iの機械的特性を制御する観点から、硬化性基を1分子あたり1個~3個有するものが好ましい。
硬化性成分I中のモノマーA2の含有割合は、10~99質量%が好ましく、20~95質量%がより好ましい。
硬化性基を有するが水酸基を有さないモノマーA2’ ’としては、炭素数8~22のアルキル基を有するアルキルアクリレート、およびアルキルメタクリレートから選ばれる1種以上が好ましい。モノマーA2としては、具体的に、n-デシルアクリレート、n-ドデシルアクリレート、n-ドデシルメタクリレート、イソオクタデシルアクリレート、n-オクタデシルメタクリレート、n-ベヘニルメタクリレート等が挙げられ、n-デシルアクリレート、n-ドデシルアクリレート、n-ドデシルメタクリレートが好ましい。
モノマーA2’としては、2-ヒドロキシプロピルアクリレート、2-ヒドロキシブチルアクリレート、4-ヒドロキシブチルアクリレート、6-ヒドロキシヘキシルアクリレート、2-ヒドロキシプロピルメタクリレート、2-ヒドロキシブチルメタクリレート、4-ヒドロキシブチルメタクリレート、6-ヒドロキシヘキシルメタクリレートなどが挙げられる。その中でも、炭素数2~8のヒドロキシアルキル基を有するヒドロキシアクリレートが好ましく、4-ヒドロキシブチルアクリレートが特に好ましい。
また、硬化性成分I中のモノマーA2’ ’の含有割合は、10~60質量%が好ましく、20~50質量%がより好ましい。モノマーA2’ ’の含有割合が10質量%以上であると、樹脂組成物の安定性向上、および粘着層Iのせん断弾性率G´を5×102~1×105Paの範囲にしやすい。
非硬化性成分IIは、樹脂組成物の硬化性成分Iを硬化させる時に硬化性化合物Iと硬化反応しない成分である。本実施形態においては、非硬化性成分IIは、水酸基を含有するポリマーBであることが好ましい。
ポリマーBの1分子当たりの水酸基数は、0.8~3個が好ましく、1.8~2.3個がより好ましい。ポリマーBの数平均分子量は、400~8000が好ましく、800~6000がより好ましい。
ポリマーBの数平均分子量が400~8000であれば、樹脂組成物中の硬化性成分Iとの相溶性を高くできる。その結果、樹脂組成物を硬化して得られる粘着層Iを透明にできる。
ポリマーBは、1種を単独で用いてもよく、2種類以上を併用してもよい。
ポリカーボネートポリオールとしては、1,6-ヘキサンジオールなどのジオール残基を有する脂肪族ポリカーボネートジオール、脂肪族環状カーボネートの開環重合体などの脂肪族ポリカーボネートジオールが挙げられる。
樹脂組成物に含まれる光重合開始剤IIIとしては、アセトフェノン系、ケタール系、ベンゾインまたはベンゾインエーテル系、フォスフィンオキサイド系、ベンゾフェノン系、チオキサントン系、キノン系等の光重合開始剤が挙げられる。これらの中でも、フォスフィンオキサイド系、チオキサントン系の光重合開始剤が好ましく、光重合反応後に着色を抑える面ではフォスフィンオキサイド系が特に好ましい。高強度の光照射による光重合反応を行う場合には、アセトフェノン系の光重合開始剤を用いると、硬化速度を高めることができるため好ましい。樹脂組成物における光重合開始剤IIIの含有量は、硬化性成分Iの合計質量(100質量部)に対して、0.01~10質量部が好ましく、0.1~5質量部がより好ましい。
重合禁止剤としては、例えば、2,5-ジ-tert-ブチルハイドロキノン、モノ-t-ブチルヒドロキノン、p-t-ブチルカテコール等が挙げられる。
本発明の粘着フィルムは、粘着層は少なくとも1層が粘着層Iであればよく、粘着層を2層以上有してもよい。粘着層を2層以上設ける構成にすると、例えば、粘着層の表層と裏層とで密着力等の物性が異なる粘着フィルムが得られる。図3は、粘着層を2層有する形態の断面図であり、粘着層21、22を保護フィルム30、31で挟持した形態の粘着フィルム11を示す。この場合、粘着層21および22の少なくとも一方が粘着層Iであればよく、両方が粘着層Iであることが好ましい。
(保護フィルム)
本発明の粘着フィルムにおいて、粘着層は、保護フィルムと接した形態又は粘着層が保護フィルムで挟持された形態とすることが好ましい。これにより、例えば粘着層の加工、搬送および保管が容易になる。
本実施形態の粘着フィルムの製造方法は、1種の樹脂組成物を用いて単層の粘着層Iを製造する方法、2種以上の樹脂組成物を用いて少なくとも1層の粘着層Iを有する2層以上の粘着層を製造する方法等が挙げられる。
製造装置110は、図5に示すように、第1の巻出しロール50、第2の巻出しロール51、第1の塗工ダイ40、第1の硬化部60、第2の塗工ダイ41、第2の硬化部63と、第1の巻取りロール52を備える。
また、第1の塗工ダイと第2の塗工ダイで塗工する樹脂組成物の塗工厚みは、同一でもよく、異なってもよい。製造する粘着フィルムの設計により、塗工厚みを適宜調整する。
本実施形態の粘着層付き透明面材80は、図6または図7に示すように、透明面材81上に粘着層20を1層以上有する。図6および図7は、下記説明する表示装置の保護板として透明面材81を使用する粘着層付き透明面材であり、周縁部に遮光印刷部82を有する透明面材81上に粘着層20を1層以上有し、粘着層20の透明面材81とは逆の面に保護フィルム31を有する形態を示す。
透明面材は、透明性を有し、平面視形状や断面形状は、限定されない。平面視形状は、矩形、周辺が直線と曲線のものなど、用いる用途に応じて設計される。断面形状は、直線形状(すなわち、矩形状断面形状)、湾曲形状、または、中央部が直線形状で端部が湾曲形状であるような直線形状と湾曲形状の組合せが挙げられる。
前記透明面材は、表示装置の表示パネルの保護に使用される保護板として好適に使用できる。保護板として使用する場合、表示パネルからの射出光や反射光に対して透明性を有することに加え、耐光性、低複屈折性、平面精度、耐表面傷付性、高い機械的強度を有する点から、保護板の材質は、ガラス板が好ましい。
保護板には、表示パネルの画像表示領域以外が保護板側から視認できないように、保護板(透明面材)の周縁に遮光部を設けること、すなわち、図6および図7のように、透明面材81の周縁部に遮光印刷部82を設けることが好ましい。これにより、表示パネルに接続されている配線部材等を隠蔽できる。遮光部は、保護板の粘着層が形成される面に形成することが好ましい。
本実施形態の粘着層付き透明面材の製造方法としては、透明面材に粘着フィルムを転写して製造する方法、透明面材上に樹脂組成物を直接塗工し、これを硬化して粘着層を形成する方法等が挙げられる。
本発明の粘着フィルムは、面材同士を貼り合わせて積層体を製造する場合に好適に使用される。例えば、粘着フィルムを用いて、一組のガラス板を貼り合わせることで、合わせガラスを製造できる。また、粘着フィルムを用いて保護板と表示パネルとを貼り合わせて、表示装置を製造できる。
また、本発明の粘着層付き透明面材は、例えば、表示パネルに貼り合わせて、表示装置を製造する場合に使用できる。
以下に、粘着フィルムおよび粘着層付き透明面材を使用する例として、表示装置について説明する。
本実施形態の表示装置1000は、表示パネル90と保護板81(すなわち、透明面材)が、粘着層20を介して貼り合わされている。本実施形態の粘着層20は、粘着層Iが使用されている。
粘着層を形成する樹脂組成物を以下のようにして製造した。
分子末端をエチレンオキシドで変性した2官能のポリプロピレングリコール(水酸基価より算出した数平均分子量:4000)と、イソホロンジイソシアネートとを、4:5のモル比で混合し、錫化合物の触媒存在下で、70℃で反応させてプレポリマーを得た。このプレポリマーと2-ヒドロキシエチルアクリレートとをほぼ1:2のモル比で混合し、70℃で反応させて、ウレタンアクリレートポリマー(以下、UAと略す。)を得た。UAの硬化性基数は2であり、数平均分子量は約24000であり、25℃における粘度は約830Pa・sであった。
粘着層の厚みは、0.5mmであった。
樹脂組成物の各成分の質量部割合を表1に記載のとおりとすること以外は例1と同様にして樹脂組成物2を得た。樹脂組成物2を使用して例1と同様の方法で粘着層を1層有する粘着フィルム2を得た。
重合開始剤IIIを1‐ヒドロキシシクロヘキシルフェニルケトン(BASF社製、製品名IRGACURE184)に変更し、酸化防止剤をBASF社製の製品名IRGASTAB PUR68に変更し、紫外線吸収剤と非硬化性成分IIを使用せず、各成分の質量部割合を表1に記載のとおりとすること以外は例1と同様にして、樹脂組成物3を得た。樹脂組成物3を使用して例1と同様の方法で粘着層を1層有する粘着フィルム3を得た。
非硬化性成分IIを使用し、表1に記載の質量部割合とすること以外は例3と同様にして、樹脂組成物4を得た。樹脂組成物4を使用して例1と同様の方法で粘着層を1層有する粘着フィルム4を得た。
表1に記載の質量部割合とすること以外は例3と同様にして、樹脂組成物5を得た。樹脂組成物5を使用して例1と同様の方法で粘着層を1層有する粘着フィルム5を得た。
市販されている厚さ0.175mmの高透明粘着フィルム(3M社製、商品名CEF03A07)を3枚重ねて、粘着層を3層有する粘着フィルム6を得た。
市販されている厚さ0.175mmの高透明粘着フィルム(3M社製、商品名CEF0507)を3枚重ねて、粘着層を3層有する粘着フィルム7を得た。
高温高圧気体透過率測定装置 (ツクバリカセイキ社製、製品名K-315-H) を用いて、以下の方法により、窒素ガス、酸素ガスおよび空気の透過係数測定を行った。
測定サンプルは、粘着フィルムの離型PETを一枚剥離し、厚さ30μmの延伸ポリプロピレン(OPP)基材に粘着フィルムを貼り合わせ、次に、もう一枚の離型PETを剥離し、φ50mmのセルに挟んで作製した。
測定に当たっては、高純度品の窒素ガスおよび酸素ガスと、空気をそれぞれ使用した。
25℃、100kPaでOPP基材側から、窒素ガス、酸素ガス、または空気を導入し、セルに挟んだ試料を介して透過してきた窒素ガス、酸素ガスおよび空気の圧力の時間変化を質量分析器で測定することにより透過曲線を得た。
得られた透過曲線の非定常状態での遅れ時間t0から式2により、窒素、酸素および空気の拡散係数Dをそれぞれ算出した。なお、粘着層に基材をつけた試料での透過曲線の非定常状態での遅れ時間t1から、OPP基材のみの試料での透過曲線の非定常状態での遅れ時間t2を引いた値(t0=t1-t2)を遅れ時間t0とした。
D=L2/(6×t0) … 式2
ただし、Lは粘着層の膜厚(単位:cm)である。
なお、表2において、各拡散係数(cm2/秒)は、「cm2/sec」の単位をもって表記されている。
ティー・エイ・インスツルメント社製、商品名ARES-G2レオメータを用いて粘着層のせん断弾性率および損失正接(tanδ)の測定を以下の通りに行った。25℃、周波数0.01-100Hz、歪3%とし、パラレルプレート25mmを用いた。周波数1Hzでのせん断弾性率および損失正接(tanδ)を25℃のせん断弾性率および損失正接(tanδ)とした。なお、せん断弾性率および損失正接(tanδ)の値には、粘着フィルムの厚さは影響しないことから、例6および7は、市販の高透明粘着フィルムを積層せず1枚(厚さ0.175μm)で測定した。
アイティー計測制御社製、商品名DVA-200を用いて粘層フィルム1~7の粘着層のガラス転移温度を測定した。測定温度は-120~180℃、昇温速度は3℃/分、周波数は1Hzの条件で行い、引張動的弾性率E’の温度変化のチャートで引張動的弾性率E’の低温側接線と引張動的弾性率E’弾性率が急激に下がる領域の接線の交点をその粘着層のガラス転移温度とした。
周辺部に高さ80μmの遮光印刷部を有するガラス板(寸法:55mm×120mm×0.7mm、開口部49mm×90mm)を準備した。これに、粘着フィルム1~7の離型PETを1枚剥離して貼り付けて、粘着層付きガラス板1~7を得た。粘着層付きガラス板1~7から他の離型PETを剥離して、厚さ0.2mmの偏光板付きガラス(53mm×96mm、厚さ0.7mm)の偏光板の面に粘着層を介して、トルクは0.4N・mで貼り付けて評価用サンプルを得た。粘着層と偏光板との界面に発生した気泡が消失する時間を測定し、泡消え特性としてその時間を表記した。気泡が消失する時間は、最大168時間計測した。
なお、2015年2月24日に出願された日本特許出願2015-033448号の明細書、特許請求の範囲、図面および要約書の全内容をここに引用し、本発明の開示として取り入れるものである。
Claims (8)
- 下記(a)~(c)の要件を備える粘着層を1層以上有することを特徴とする粘着フィルム。
(a)窒素ガスの拡散係数が1.5×10-6cm2/秒以上。
(b)測定温度25℃、周波数1Hzにおけるせん断弾性率G’(1Hz)が5×102~1.0×105Pa。
(c)赤外線吸収スペクトルにおいて、800~820cm-1に吸収ピークを有し、1000~1020cm-1に吸収ピークを有さない。 - 前記粘着層のガラス転移温度が-65℃以下である請求項1に記載の粘着フィルム。
- 前記粘着層の測定温度25℃、周波数1Hzにおけるtanδが0.01~1.4である請求項1または2に記載の粘着フィルム。
- 透明面材と、下記(a)~(c)の要件を備える粘着層を1層以上有することを特徴とする粘着層付き透明面材。
(a)窒素ガスの拡散係数が1.5×10-6cm2/秒以上。
(b)測定温度25℃、周波数1Hzにおけるせん断弾性率G’(1Hz)が5×102~1.0×105Pa。
(c)赤外線吸収スペクトルにおいて、800~820cm-1に吸収ピークを有し、1000~1020cm-1に吸収ピークを有さない。 - 前記粘着層のガラス転移温度が-65℃以下である請求項4に記載の粘着層付き透明面材。
- 前記粘着層の測定温度25℃、周波数1Hzにおけるtanδが0.1~1.4である請求項4または5に記載の粘着層付き透明面材。
- 透明面材が、表示装置の保護板である請求項4~6のいずれか1項に記載の粘着層付き透明面材。
- 透明面材と表示パネルとが、請求項1~3のいずれか1項に記載の粘着フィルムを介して積層されていることを特徴とする表示装置。
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CN201680011725.8A CN107250303A (zh) | 2015-02-24 | 2016-02-05 | 粘接膜、带粘接层的透明面材、以及显示装置 |
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JP2018039999A (ja) * | 2016-09-05 | 2018-03-15 | 荒川化学工業株式会社 | 紫外線硬化型粘着剤、硬化物、粘着シート |
JP2018100403A (ja) * | 2016-12-20 | 2018-06-28 | 荒川化学工業株式会社 | 紫外線硬化型粘着剤、硬化物、及び粘着シート |
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KR20180052810A (ko) * | 2016-11-10 | 2018-05-21 | 삼성디스플레이 주식회사 | 표시 장치용 커버 윈도우 및 이를 포함하는 표시 장치 |
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US20170313039A1 (en) | 2017-11-02 |
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US10675846B2 (en) | 2020-06-09 |
KR20170121153A (ko) | 2017-11-01 |
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