WO2017082130A1 - 積層ポリエステルフィルム - Google Patents
積層ポリエステルフィルム Download PDFInfo
- Publication number
- WO2017082130A1 WO2017082130A1 PCT/JP2016/082554 JP2016082554W WO2017082130A1 WO 2017082130 A1 WO2017082130 A1 WO 2017082130A1 JP 2016082554 W JP2016082554 W JP 2016082554W WO 2017082130 A1 WO2017082130 A1 WO 2017082130A1
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- WIPO (PCT)
- Prior art keywords
- mass
- polyester film
- zirconia
- particles
- parts
- Prior art date
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/0427—Coating with only one layer of a composition containing a polymer binder
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
- B32B7/04—Interconnection of layers
- B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/11—Anti-reflection coatings
- G02B1/111—Anti-reflection coatings using layers comprising organic materials
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/10—Optical coatings produced by application to, or surface treatment of, optical elements
- G02B1/14—Protective coatings, e.g. hard coatings
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
Definitions
- the present invention relates to an easily-adhesive polyester film that can secure low interference and can solve the problem of rainbow unevenness and is excellent in transparency. More specifically, the present invention relates to an easily-adhesive polyester film that has few fine scratches and can be suitably used in high-definition optical applications.
- a hard coat film in which a transparent hard coat layer is laminated is used on the front surface of displays such as touch panels, computers, televisions, and liquid crystal display devices, and decorative materials.
- a transparent plastic film of the base material a transparent polyester film is generally used, and in order to improve the adhesion between the base material polyester film and the hard coat layer, these intermediate layers have easy adhesion.
- a coating layer is provided.
- the hard coat film is required to have temperature, humidity, light resistance, transparency, chemical resistance, scratch resistance, antifouling property, and the like. Moreover, since it is often used on the surface of a display or a decoration material, visibility and design are required. Therefore, in order to suppress glare and iris-like color caused by reflected light when viewed from an arbitrary angle, the antireflection of a multilayer structure in which a high refractive index layer and a low refractive index layer are laminated on top of the hard coat layer. It is common practice to provide a layer.
- the iris-like color (interference spots) of the hard coat film includes the refractive index (eg, 1.62-1.65) of the base polyester film and the refractive index (eg, 1.49) of the hard coat layer made of acrylic resin or the like. It is said that it occurs because of the large difference.
- a coating layer is provided on the polyester film of the base material, the refractive index difference between the polyester film and the coating layer, the refraction of the coating layer and the hard coat layer
- a method is disclosed in which the refractive index of the coating layer is controlled by the contents of the resin constituting the coating layer and the high refractive additive so as to reduce the difference in rate.
- an optically easy-adhesive polyester film having an effect of suppressing interference spots and having high adhesion to transparency and a hard coat layer without scratching the coating layer even during high-speed processing is being eagerly desired.
- the present invention has been made against the background of the problems of the prior art. That is, the object of the present invention is excellent in the balance of characteristics such as slipperiness and transparency, excellent in handling properties in manufacturing and in subsequent processes such as a polarizing plate manufacturing process of a liquid crystal display device, less scratched, and rainbow unevenness.
- An object of the present invention is to provide an easy-adhesive polyester film that can be suitably used in optical applications that are also excellent in low interference for suppression.
- this invention consists of the following structures.
- the present invention low interference that can suppress rainbow unevenness can be secured, the balance between transparency and slipperiness is excellent, scratches are small, and handling in the post-process such as the manufacturing process of a polarizing plate of a liquid crystal display device. It has become possible to provide an easy-adhesive polyester film that can be suitably used in optical applications with excellent properties.
- the polyester film used as a substrate in the present invention is a film composed of a polyester resin, and a polyester film mainly comprising at least one of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate is preferred. . Moreover, the film which a 3rd component monomer consists of copolyester in the above polyesters may be sufficient. Among these polyester films, a polyethylene terephthalate film is most preferable from the balance between physical properties and cost.
- the polyester film may be a single layer or a multilayer. Moreover, as long as it exists in the range with the effect of this invention, each of these layers can contain various additives in a polyester resin as needed.
- the additive include an antioxidant, a light resistance agent, an antigelling agent, an organic wetting agent, an antistatic agent, an ultraviolet absorber, and a surfactant.
- the easy-adhesive polyester film of the present invention is one in which an easy-adhesive coating layer is laminated on a polyester base film as described above.
- the coating layer contains zirconia / titania mixed particles A (hereinafter sometimes simply referred to as particles A), lubricant particles B (hereinafter sometimes simply referred to as particles B), and a binder resin.
- Particle A is a zirconia / titania mixed particle.
- the mixed particles referred to in the present invention are a particle group containing both zirconia and titania in an aggregated state in which zirconia and titania are each dispersed in a single liquid and do not form a complex.
- the liquid component is hardly evaporated in the drying process and the curing process.
- the liquid is preferably an aqueous liquid in order to easily form an application layer by a so-called in-line coating method described later.
- the particles A may contain other components other than zirconia / titania, and may be inorganic particles or organic particles, and are not particularly limited.
- the inorganic particles are inert to metal oxides such as titanium, zirconium oxide, talc, and kaolinite, and polyesters such as calcium carbonate, calcium phosphate, and barium sulfate.
- the ratio of the total mass of zirconia and titania to the mass of particles A is preferably 70% by mass or more, more preferably 80% by mass or more, and still more preferably 90% by mass. % Or more. Of course, it may be 100% by mass. If the ratio of the total mass of zirconia and titania in the particles A is 70% by mass or more, it is preferable that a balance between slipperiness and transparency is achieved.
- the ratio of the mass of zirconia to the total mass of zirconia and titania constituting the mixed particle A is preferably 10% by mass or more, more preferably 20% by mass or more, and further preferably 30% by mass or more. It is particularly preferably 40% by mass or more, more particularly preferably 50% by mass or more, and most preferably 55% by mass or more.
- the ratio of the mass of zirconia to the total mass of zirconia and titania is 10% by mass or more, the surface roughness does not become excessively large, the slipping property with the guide roll becomes appropriate, and it is difficult to be damaged. Therefore, the haze does not increase and the transparency is excellent.
- the ratio of the mass of zirconia to the total mass of zirconia and titania constituting the particles A is preferably 90% by mass or less, more preferably 85% by mass or less, still more preferably 80% by mass or less, particularly Preferably it is 77 mass% or less. If the ratio of the mass of zirconia to the total mass of zirconia and titania is 90% by mass or less, the surface roughness will not be too small, moderate slipperiness is maintained, handling properties are good, and unwinding Sometimes it is hard to get scratched and preferable.
- the ratio of the mass of titania to the total mass of zirconia and titania constituting the particle A is preferably 10% by mass or more, more preferably 15% by mass or more, still more preferably 20% by mass or more, and particularly preferably 23% by mass. % Or more.
- the ratio of the titania mass to the total mass of zirconia and titania is 10 mass% or more, the slipperiness is improved, the handling is improved, and the scratch resistance is improved.
- an increase in the ratio of the mass of titania to the total mass of zirconia and titania means a decrease in the ratio of the mass of zirconia, so that it is preferably 90% by mass or less, more preferably 80% by mass. Or less, more preferably 70% by mass or less, particularly preferably 60% by mass or less, still more preferably 50% by mass or less, and most preferably 45% by mass or less.
- the average particle size of the particles A is preferably 5 nm or more, more preferably 10 nm or more, still more preferably 15 nm or more, and particularly preferably 20 nm or more. It is preferable that the average particle diameter of the particles A is 5 nm or more because they are less likely to aggregate.
- the average particle diameter of the particles A is preferably 200 nm or less, more preferably 150 nm or less, still more preferably 100 nm or less, and particularly preferably 60 nm or less.
- the average particle size of the particles A is preferably 200 nm or less because of good transparency.
- Particle B consists of (1) silica, kaolinite, talc, light calcium carbonate, heavy calcium carbonate, zeolite, alumina, barium sulfate, carbon black, zinc oxide, zinc sulfate, zinc carbonate, titanium dioxide, satin white, aluminum silicate Inorganic particles such as diatomaceous earth, calcium silicate, aluminum hydroxide, hydrous halloysite, magnesium carbonate, magnesium hydroxide, (2) acrylic or methacrylic, vinyl chloride, vinyl acetate, nylon, styrene / acrylic, Styrene / butadiene, polystyrene / acrylic, polystyrene / isoprene, polystyrene / isoprene, methyl methacrylate / butyl methacrylate, melamine, polycarbonate, urea, epoxy, urethane, phenol , Diallyl phthalate, but include organic particles of polyester or the like, to give an appropriate sliding property to the coating layer
- the average particle size of the particles B is preferably 200 nm or more, more preferably 250 nm or more, still more preferably 300 nm or more, and particularly preferably 350 nm or more. It is preferable that the average particle diameter of the particles B is 200 nm or more because aggregation is difficult and slipperiness can be secured.
- the average particle size of the particles B is preferably 2000 nm or less, more preferably 1500 nm, still more preferably 1000 nm, and particularly preferably 700 nm. It is preferable that the average particle size of the particles B is 2000 nm or less because transparency is maintained and the particles do not fall off.
- the surface treatment of the particles A and B may be performed, and the surface treatment method includes physical surface treatment such as plasma discharge treatment and corona discharge treatment and chemical surface treatment using a coupling agent.
- a coupling agent an organoalkoxy metal compound (eg, titanium coupling agent, silane coupling agent) is preferably used.
- the particles B are silica, silane coupling treatment is particularly effective.
- the surface treatment agent for particles B may be used in advance for surface treatment prior to preparation of the layer coating solution, or may be further added as an additive during preparation of the layer coating solution and contained in the layer. Of course, it may be used for the particles A.
- the binder resin constituting the coating layer is not particularly limited as long as it provides easy adhesion, but specific examples of the polymer include polyester resin, acrylic resin, urethane resin, polyvinyl resin (polyvinyl alcohol, etc.), polyalkylene. Examples include glycol, polyalkyleneimine, methylcellulose, hydroxycellulose, and starches. Among these, it is preferable to use a polyester resin, an acrylic resin, or a urethane resin from the viewpoint of particle retention and adhesion. Moreover, when considering familiarity with a polyester film, a polyester resin is optimal. These binder resins may be used in combination.
- the polyester resin may be 100% by mass in the total solid component in the coating layer, but is preferably contained in an amount of 10% by mass to 90% by mass. More preferably, it is 20% by mass or more and 80% by mass or less.
- the content of the polyester resin is 90% by mass or less, the adhesion with the hard coat layer under high temperature and high humidity is preferably maintained.
- the content is 10% by mass or more, the adhesion with a polyester film under normal temperature and high temperature and high humidity is preferably maintained due to the presence of other urethane resins and the like.
- the coating layer may include a crosslinking agent.
- a crosslinking agent By containing a crosslinking agent, it becomes possible to further improve the adhesion under high temperature and high humidity.
- Specific examples of the crosslinking agent include urea, epoxy, melamine, isocyanate, oxazoline, and carbodiimide.
- melamine-based, isocyanate-based, oxazoline-based, and carbodiimide-based crosslinking agents are preferred because of the stability over time of the coating solution and the effect of improving adhesion under high-temperature and high-humidity treatment.
- a catalyst etc. can be used suitably as needed.
- content in the application layer of a crosslinking agent 5 mass% or more and 50 mass% or less are preferable in all the solid components. More preferably, it is 10 mass% or more and 40 mass% or less. If it is 10% by mass or more, the strength of the resin of the coating layer is maintained, the adhesiveness under high temperature and high humidity is good, and if it is 40% by mass or less, the flexibility of the resin of the coating layer is maintained, Adhesion at normal temperature and high temperature and high humidity is maintained, which is preferable.
- the content of the particles A in the coating layer is preferably 2% by mass or more, more preferably 3% by mass or more, still more preferably 4% by mass or more, and particularly preferably 5% by mass or more.
- the content of the particles A in the coating layer is 2% by mass or more, the refractive index of the coating layer can be kept high, and low interference is effectively obtained, which is preferable.
- the particle A content in the coating layer is preferably 50% by mass or less, more preferably 40% by mass or less, still more preferably 30% by mass or less, and particularly preferably 20% by mass or less.
- the particle A content in the coating layer is 50% by mass or less, the film forming property is maintained, which is preferable.
- the particle B content in the coating layer is preferably 0.1% by mass or more, more preferably 0.5% by mass or more, and further preferably 1% by mass or more.
- an appropriate slip property is maintained, which is preferable.
- the particle B content in the coating layer is preferably 20% by mass or less, more preferably 15% by mass or less, and still more preferably 10% by mass or less.
- the haze is kept low, which is preferable in terms of transparency.
- the film thickness of the coating layer is preferably 0.001 ⁇ m or more, more preferably 0.01 ⁇ m or more, still more preferably 0.02 ⁇ m or more, and particularly preferably 0.05 ⁇ m or more.
- the thickness of the coating layer is 0.001 ⁇ m or more, the adhesiveness is good, which is preferable.
- the film thickness of the coating layer is preferably 2 ⁇ m or less, more preferably 1 ⁇ m or less, still more preferably 0.8 ⁇ m or less, and particularly preferably 0.5 ⁇ m or less. It is preferable that the coating layer has a thickness of 2 ⁇ m or less because there is no risk of blocking.
- the coating layer may contain a surfactant for the purpose of improving leveling properties during coating and defoaming the coating solution.
- the surfactant may be any of cationic, anionic, and nonionic surfactants, but is preferably a silicone, acetylene glycol, or fluorine surfactant. These surfactants are preferably contained in the coating layer within a range that does not impair the effect of suppressing the iris-like color and the adhesion under a fluorescent lamp.
- additives may be included in a range that does not impair the effect of suppressing the iris-like color and the adhesiveness under a fluorescent lamp.
- the additive include fluorescent dyes, fluorescent brighteners, plasticizers, ultraviolet absorbers, pigment dispersants, foam suppressors, antifoaming agents, and preservatives.
- any of a so-called in-line coating method in which a polyester base film is simultaneously formed and a so-called off-line coating method in which a polyester base film is formed and then coated with a coater can be applied.
- An in-line coating method is more efficient and more preferable.
- any known method can be used as a method for applying a coating solution to a polyethylene terephthalate (hereinafter abbreviated as PET) film.
- PET polyethylene terephthalate
- reverse roll coating method gravure coating method, kiss coating method, die coater method, roll brush method, spray coating method, air knife coating method, wire bar coating method, pipe doctor method, impregnation coating method, curtain coating method, etc. It is done. These methods are applied alone or in combination.
- a method of providing a coating layer on a polyester film a method of coating and drying a coating solution containing a solvent, particles and a resin on the polyester film can be mentioned.
- the solvent include organic solvents such as toluene, water, and a mixed system of water and a water-soluble organic solvent.
- water alone or a mixture of a water-soluble organic solvent and water is used from the viewpoint of environmental problems. preferable.
- the solid content concentration of the coating liquid is preferably 2% by mass or more, and more preferably 4% by mass, although it depends on the type of binder resin and the type of solvent.
- the solid content concentration of the coating liquid is preferably 35% by mass or less, and more preferably 15% by mass or less.
- the drying temperature after coating also depends on the type of binder resin, the type of solvent, the presence or absence of a crosslinking agent, the solid content concentration, etc., but is preferably 80 ° C. or higher, and preferably 250 ° C. or lower.
- the surface roughness (Ra) of the coating layer is related to the slipperiness of the surface of the coating layer, and is preferably 0.01 nm or more, more preferably 0.1 nm or more, and further preferably 0.2 nm or more. And particularly preferably 0.5 nm or more.
- the upper limit of the surface roughness (Ra) of the coating layer is preferably 200 nm or less, more preferably 100 nm or less, still more preferably 80 nm or less, and particularly preferably 50 nm or less.
- the easily adhesive polyester film for optics of the present invention can be manufactured according to a general method for manufacturing a polyester film.
- the polyester resin is melted and the non-oriented polyester extruded and formed into a sheet shape is stretched in the longitudinal direction by utilizing the speed difference of the roll at a temperature equal to or higher than the glass transition temperature, and then stretched in the transverse direction by a tenter.
- the method of performing heat processing is mentioned.
- the polyester film of the present invention may be a uniaxially stretched film or a biaxially stretched film, but when the biaxially stretched film is used as a protective film on the front surface of the liquid crystal panel, it is observed from directly above the film surface. However, rainbow-like color spots are not seen, but care must be taken because rainbow-like color spots may be observed when observed from an oblique direction.
- This phenomenon is that a biaxially stretched film is composed of refractive index ellipsoids having different refractive indexes in the running direction, width direction, and thickness direction, and the retardation becomes zero depending on the light transmission direction inside the film (refractive index ellipse). This is because there is a direction in which the body appears to be a perfect circle. Therefore, when the liquid crystal display screen is observed from a specific oblique direction, a point where the retardation becomes zero may be generated, and a rainbow-like color spot is generated concentrically around that point.
- the angle ⁇ increases as the birefringence in the film increases, and the rainbow-like color increases. Spots are difficult to see.
- the biaxially stretched film tends to reduce the angle ⁇ , and therefore the uniaxially stretched film is more preferable because rainbow-like color spots are less visible.
- the present invention has biaxiality (biaxiality) in a range that does not substantially cause rainbow-like color spots or a range that does not cause rainbow-like color spots in the viewing angle range required for a liquid crystal display screen. It is preferable.
- the laminated polyester film used mainly for optical applications of the present invention is a hard coat layer comprising an electron beam, an ultraviolet curable acrylic resin, a siloxane thermosetting resin, or the like on the coating layer of the easily adhesive polyester film of the present invention. Etc. are provided.
- Functional layers are anti-glare layers, anti-glare anti-reflection layers, anti-reflection layers, low reflection layers, and the like in addition to the hard coat layers described above for the purpose of preventing reflections, suppressing glare, suppressing rainbow unevenness, and suppressing scratches.
- a layer having functionality such as an antistatic layer.
- the functional layer various types known in the art can be used, and the type is not particularly limited. Hereinafter, each functional layer will be described.
- a known hard coat layer can be used, and is not particularly limited, but is polymerized by drying, heat, chemical reaction, or irradiation with any of electron beam, radiation, and ultraviolet rays. And / or a reactive resin compound can be used.
- curable resins include melamine-based, acrylic-based, silicone-based, and polyvinyl alcohol-based curable resins.
- a photocurable acrylic curable resin is used. Resins are preferred.
- an acrylic curable resin a polyfunctional (meth) acrylate monomer or an acrylate oligomer can be used.
- acrylate oligomer examples include polyester acrylate, epoxy acrylate, urethane acrylate, Examples include ether acrylate, polybutadiene acrylate, and silicone acrylate.
- a coating composition for forming the optical functional layer can be obtained by mixing a reactive diluent, a photopolymerization initiator, a sensitizer and the like with these acrylic curable resins.
- the hard coat layer may have an antiglare function (antiglare function) that scatters external light.
- the antiglare function (antiglare function) can be obtained by forming irregularities on the surface of the hard coat layer.
- the haze of the film is ideally preferably 0 to 50%, more preferably 0 to 40%, and particularly preferably 0 to 30%.
- 0% is ideal and may be 0.2% or more, or 0.5% or more.
- the film of the present invention is mainly used for optical films in general, such as prism lens sheets, AR (anti-reflection) films, hard coat films, diffusion plates, anti-crush films, LCDs, flat TVs, CRTs, etc. It can be suitably used for a base film for a member, a near-infrared absorbing filter as a member on a front plate for a plasma display, a transparent conductive film such as a touch panel or electroluminescence, and the like.
- the acrylic resin curable by electron beam or ultraviolet rays for forming the hard coat layer described above has an acrylate functional group, for example, a relatively low molecular weight polyester resin, polyether resin, acrylic resin. , Epoxy or urethane resins, alkyd resins, spiroacetal resins, polybutadiene resins, polythiol polyene resins, oligomers or prepolymers of polyfunctional compounds such as polyhydric alcohols or prepolymers and ethyl (meth) as a reactive diluent Monofunctional monomers such as acrylate, ethylhexyl (meth) acrylate, styrene, methylstyrene, N-vinylpyrrolidone, and polyfunctional monomers such as trimethylolpropane tri (meth) acrylate, hexanediol (meth) acrylate Relate, tripropylene glycol di (meth) acrylate, diethylene
- acetophenones acetophenones, benzophenones, Michler benzoylbenzoate, ⁇ -amyloxime ester, tetramethyltyramium monosulfide, thioxanthone
- n-butylamine, triethylamine, tri-n-butylphosphine or the like can be used as a photosensitizer.
- the silicone-based (siloxane-based) thermosetting resin can be produced by hydrolyzing and condensing a single or a mixture of two or more organosilane compounds under an acid or base catalyst.
- the above-mentioned electron beam, UV curable acrylic resin or siloxane thermosetting resin is applied to the surface of the easy-adhesive polyester film.
- the coating layer is provided on both surfaces, it is coated on at least one coating layer surface.
- an organic solvent such as the viscosity, wettability, coating thickness, etc.
- the coating layer is obtained by curing the coating layer by applying an electron beam or ultraviolet ray and heating according to the curing conditions of the coating solution after applying the coating solution to the above-mentioned film and drying it as necessary. Then, a hard coat layer is formed.
- the thickness of the hard coat layer is preferably 1 to 15 ⁇ m. It is preferable that the thickness of the hard coat layer is 1 ⁇ m or more, since the effects on the chemical resistance, scratch resistance, antifouling property, etc. as the hard coat layer are efficiently exhibited. On the other hand, when the thickness is 15 ⁇ m or less, the flexibility of the hard coat layer is maintained, and there is no possibility that cracks or the like occur, which is preferable.
- scratch resistance it is preferable that scratches are not noticeable visually when the coated surface is worn with a black mount. If scratches are not conspicuous in the above evaluation, it is difficult to be damaged when passing through the guide roll, which is preferable from the viewpoint of handling properties.
- the lower limit of the static friction coefficient ( ⁇ s) is preferably 0.3, and if it is 0.3 or more, there is no problem of slipping too much, so it is easy to wind up with a hard chrome plating roll or the like in the manufacturing process. Handling properties and blocking resistance are preferably maintained.
- the upper limit of the static friction coefficient ( ⁇ s) is preferably 0.5, and it is preferably 0.5 or less because there is no fear of scratching the film that becomes the contact surface during winding.
- the lower limit of the dynamic friction coefficient ( ⁇ d) is preferably 0.4, and if it is 0.4 or more, there is no problem of slipping too much, so that it is easy to wind up with a hard chrome plating roll or the like in the manufacturing process. Handling properties and blocking resistance are preferably maintained.
- the upper limit of the dynamic friction coefficient ( ⁇ d) is preferably 0.6, and it is preferably 0.6 or less because there is no fear of scratching the film that becomes the contact surface during winding.
- the polyester film of the present invention is mainly used as an easily adhesive film for optics, it is preferable that the polyester film has high transparency.
- the lower limit of the haze is ideally 0%, and the closer to 0%, the more preferable.
- the upper limit of haze is preferably 2%, and it is preferably 2% or less because the light transmittance is good and a clear image can be obtained in a liquid crystal display device.
- the haze of the polyester film can be measured, for example, according to a method described later.
- the lower limit of the adhesiveness between the easy-adhesive layer coating layer and the hard coat layer is preferably 80%, and the upper limit is preferably 100%, as evaluated by the measurement method described later. It can be said that the adhesiveness of a coating layer and a hard-coat layer is fully hold
- the lower limit is preferably 10%
- the upper limit of the high temperature and high humidity adhesion is preferably 100%. is there.
- it is 10% or more, the adhesiveness between the easy-adhesion layer and the hard coat layer is fully satisfied under high temperature and high humidity conditions, and the passability in the post-processing step is fully satisfied. More preferably, it is 50% or more.
- the polyester film for protecting a polarizer formed with a hard coat is preferably not able to confirm interference spots by the evaluation method described later, and if the interference spots by the evaluation method cannot be confirmed, the visibility of the liquid crystal image device becomes good. preferable.
- the easy-adhesive polyester film of the present invention can be used for various applications, but is preferably used in the production process of a polarizing plate used in a liquid crystal display device, and particularly preferably used as a protective film for a polarizer constituting the polarizing plate.
- the polarizer is often made of polyvinyl alcohol
- the easy-adhesive polyester film of the present invention is bonded to the polarizer using an adhesive made of polyvinyl alcohol or a crosslinking agent or the like, if necessary. In that case, it is more preferable to use the coating layer of the easily adhesive polyester film of the present invention not on the surface to be bonded to the polarizer but on the opposite surface.
- the surface of the easy-adhesive polyester film of the present invention to be bonded to the polarizer contains an easy-adhesion containing, for example, a polyester resin, a polyvinyl alcohol resin, and a crosslinking agent as described in International Publication No. 2012/105607. It is preferable that the layers are laminated.
- Average particle size [measurement method using a scanning electron microscope]
- the average particle diameter of the above particles can be measured by the following method. Take a picture of the particles with a scanning electron microscope (SEM) and at a magnification such that the size of one smallest particle is 2-5 mm, the maximum diameter of 300-500 particles (between the two most distant points) Distance) is measured, and the average value is taken as the average particle diameter.
- the average particle diameter of the particles present in the coating layer in the present invention can be measured by the measurement method.
- the average particle diameter of the particles can also be determined by a dynamic scattering method at the time of producing the particles and film.
- the sol was diluted with a dispersion medium, measured with a submicron particle analyzer N4 PLUS (manufactured by Beckman Coulter, Inc.) using parameters of the dispersion medium, and calculated by a cumulant method to obtain an average particle diameter.
- the dynamic light scattering method the average particle diameter of the particles in the sol is observed. When there is aggregation between the particles, the average particle diameter of the aggregated particles is observed.
- the refractive index of the particles can be measured by the following method. After the inorganic particles are dried at 150 ° C., the powder pulverized in a mortar is immersed in the solvent 1 (having a lower refractive index than the particles), and then the solvent 2 (having a higher refractive index than the particles) is little by little transparent. Added until. The refractive index of this solution was measured using an Abbe refractometer (Abago Abbe refractometer). The measurement was performed at 23 ° C. and D line (wavelength 589 nm). The solvent 1 and the solvent 2 are selected so that they can be mixed with each other.
- the solvent include carbon, toluene, and glycerin.
- Interference fringe improvement (iris color)
- a hard coat layer was formed on the easy-adhesion layer of the optically-adhesive polyester film obtained in each Example.
- the optically easy-adhesive polyester film on which a hard coat was formed was cut into an area of 10 cm (film width direction) ⁇ 15 cm (film longitudinal direction) to prepare a sample film.
- a black glossy tape (manufactured by Nitto Denko Corporation, vinyl tape No. 21; black) was bonded to the surface opposite to the hard coat layer surface of the obtained sample film.
- the results of visual observation are ranked according to the following criteria.
- the observation is performed by five people who are familiar with the evaluation, and the highest rank is the evaluation rank. If two ranks have the same number, the center of the rank divided into three is adopted.
- ⁇ and ⁇ are 2 people each and ⁇ is 1 person
- ⁇ is ⁇
- ⁇ is 1 person
- ⁇ and ⁇ are 2 people each
- ⁇ , ⁇ and ⁇ are 2 people each and ⁇ is 1
- ⁇ is adopted.
- ⁇ Iridescent colors are not observed even when observed from all angles.
- ⁇ Some iris colors are observed at some angles.
- ⁇ Slightly iris colors are observed.
- X Clear iris colors are observed. Be done
- Resin composition The resin was dissolved in deuterated chloroform, 1H-NMR analysis was performed using a nuclear magnetic resonance analyzer (NMR) Gemini-200 manufactured by Varian, and the mol% ratio of each composition was determined from the integral ratio.
- NMR nuclear magnetic resonance analyzer
- Ra Surface roughness (Ra) Based on JIS-B0601-2001, Ra was measured with Surfcom (registered trademark) 304B (manufactured by Tokyo Seimitsu Co., Ltd.). The measurement conditions were a cutoff of 0.08 ⁇ m, a stylus radius of 2 ⁇ m, a measurement length of 0.8 mm, and a measurement speed of 0.03 mm / second.
- the temperature was raised to 255 ° C., the pressure of the reaction system was gradually reduced, and the mixture was reacted for 1 hour 30 minutes under a reduced pressure of 30 Pa to obtain a copolymerized polyester resin (I).
- the obtained copolyester resin (I) was light yellow and transparent.
- the reduced viscosity of the copolyester resin (I) was measured and found to be 0.70 dl / g.
- the glass transition temperature by DSC was 40 ° C., and the number average molecular weight was 20000.
- the composition of the copolyester resin (I) is as follows.
- Dicarboxylic acid formation terephthalic acid 49 mol%, isophthalic acid 48 mol%, 5-sodium isophthalic acid 3 mol% -Diol component: ethylene glycol 40 mol%, diethylene glycol 60 mol%
- Polymerization of block polyisocyanate crosslinking agent 100 parts by mass of a polyisocyanate compound having an isocyanurate structure using hexamethylene diisocyanate as a raw material (manufactured by Asahi Kasei Chemicals, Duranate TPA) in a flask equipped with a stirrer, a thermometer and a reflux condenser, 55 parts by mass of propylene glycol monomethyl ether acetate, 30 parts by mass of polyethylene glycol monomethyl ether (average molecular weight 750) was charged and held at 70 ° C. for 4 hours in a nitrogen atmosphere.
- a polyisocyanate compound having an isocyanurate structure using hexamethylene diisocyanate as a raw material manufactured by Asahi Kasei Chemicals, Duranate TPA
- reaction solution temperature was lowered to 50 ° C., and 47 parts by mass of methyl ethyl ketoxime was added dropwise.
- the infrared spectrum of the reaction solution was measured to confirm that the absorption of the isocyanate group had disappeared, and a block polyisocyanate aqueous dispersion (III) having a solid content of 75% by mass was obtained.
- Epoxy-based crosslinking agent Denacol EX-521 (solid content concentration 100%) manufactured by Nagase ChemteX Corporation was used as the epoxy crosslinking agent (epoxy crosslinking agent (VI)).
- melamine crosslinking agent As the melamine-based crosslinking agent, DIC's Becamine M-3 (solid content concentration 60%) was used (melamine-based crosslinking agent (VII)).
- Zirconia particles A 3 liter glass container was charged with 2283.6 g of pure water and 403.4 g of oxalic acid dihydrate and heated to 40 ° C. to prepare a 10.72 mass% oxalic acid aqueous solution. While stirring this aqueous solution, 495.8 g of zirconium oxycarbonate powder (ZrOCO 3 , manufactured by AMR International Corp., containing 39.76% by mass in terms of ZrO 2 ) was gradually added and mixed for 30 minutes. And heating at 90 ° C. for 30 minutes.
- ZrOCO 3 zirconium oxycarbonate powder
- the transmittance measured by adjusting the sol to a ZrO 2 concentration of 2.0% by mass with pure water was 88%.
- the particles were observed with a transmission electron microscope, most of the aggregated particles of ZrO 2 primary particles of around 7 nm were found.
- 4000 g of zirconia sol having a ZrO 2 concentration of 4.0% by mass obtained by performing the hydrothermal treatment was washed and concentrated while gradually adding pure water to obtain a ZrO 2 concentration.
- 953 g of zirconia sol having a transmittance of 76% when 13.1% by mass, pH 4.9, and ZrO 2 concentration of 13.1% by mass were obtained.
- titanium tetrachloride aqueous solution containing 7.75% by mass of titanium tetrachloride manufactured by Osaka Titanium Technologies Co., Ltd.
- ammonia water containing 15% by mass of ammonia manufactured by Ube Industries
- the obtained mixed aqueous solution was cooled to room temperature, and then concentrated with an ultrafiltration membrane device (ACV-3010, manufactured by Asahi Kasei Co., Ltd.).
- ACV-3010 manufactured by Asahi Kasei Co., Ltd.
- 9.90 kg of an aqueous dispersion sol containing “P-1” was obtained.
- the solids contained in the sol thus obtained were measured by the above method. As a result, they were titanium-based fine particles (primary particles) having a rutile crystal structure and composed of a composite oxide containing titanium and tin. It was. Furthermore, when the content of the metal component contained in the titanium-based fine particles was measured, 87.2% by mass of TiO 2 , 11.0% by mass of SnO 2 , and K 2 O based on the oxide conversion standard of each metal component.
- the pH of the mixed aqueous solution was 10.0.
- the water-dispersed sol containing the titanium-based fine particles is transparent milky white, the average particle size of the titanium-based fine particles contained in the water-dispersed sol is 35 nm, and coarse particles having a particle size of 100 nm or more.
- the distribution frequency was 0%.
- the refractive index of the obtained titanium-based fine particles could be regarded as 2.42.
- zirconia / titania mixed particles The zirconia / titania mixed particles having a solid content concentration of 13% by mass were prepared by mixing the zirconia particles obtained above and titania particles at respective ratios.
- a coating liquid for forming a hard coat layer having the following composition was applied to the surface of the polyester film manufactured in the examples described later on the side opposite to the surface to be bonded to the polarizer, using a # 10 wire bar, and at 70 ° C. for 1 minute. Dry and remove the solvent.
- the film coated with the hard coat layer was irradiated with 300 mJ / cm 2 ultraviolet rays using a high-pressure mercury lamp to obtain a polarizer protective film having a hard coat layer with a thickness of 5 ⁇ m.
- Example 1 (Coating solution adjustment) A coating solution having the following composition was prepared. Water 34.94 parts by weight Isopropyl alcohol 30.00 parts by weight Particle A-1 7.24 parts by weight (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass) Particle B-1 0.90 parts by mass (silica sol with an average particle diameter of 450 nm, solid content concentration 40% by mass) Polyester aqueous dispersion (I ⁇ ) 17.92 parts by mass (solid content concentration 28.2% by mass) Block isocyanate based crosslinking agent (III) 2.90 parts by mass (solid content concentration 75% by mass) Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass) High boiling point solvent 3.00 parts by weight Dispersing aid 0.26 parts by weight
- 0.62 dl / g and substantially free of particles are obtained at 135 ° C. under a reduced pressure of 133 Pa. Dry for hours.
- the sheet was supplied to an extruder, melted and extruded into a sheet at about 280 ° C., and rapidly cooled and solidified on a rotating cooling metal roll maintained at a surface temperature of 20 ° C. to obtain an unstretched PET sheet.
- the unstretched PET sheet was heated to 100 ° C. with a heated roll group and an infrared heater, and then stretched 3.5 times in the longitudinal direction with a roll group having a difference in peripheral speed to obtain a uniaxially stretched PET film.
- Example 2 instead of the coating liquid particle A-1, an easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the ratio of the zirconia mass to the total mass of zirconia and titania was changed to the particle A-2 having a mass of 50 mass%. Got.
- Example 3 instead of the coating liquid particle A-1, an easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the ratio of the zirconia mass to the total mass of zirconia and titania was changed to the particle A-3 having a mass of 25 mass%. Got.
- Example 4 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Particle A-1 3.79 parts by mass (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Particle B-1 0.95 parts by mass (silica sol with an average particle diameter of 450 nm, solid content concentration 40% by mass)
- Block isocyanate-based crosslinking agent (III) 3.03 parts by mass (solid content concentration 75% by mass)
- Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass)
- Example 5 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Particle A-1 10.39 parts by weight (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Particle B-1 0.87 parts by mass (silica sol with an average particle diameter of 450 nm, solid concentration 40% by mass)
- Polyester aqueous dispersion (I ⁇ ) 17.15 parts by mass (solid content concentration 28.2% by mass)
- Block isocyanate-based crosslinking agent (III) 2.80 parts by mass (solid content concentration 75% by mass)
- Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass)
- Example 6 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Particle A-1 7.24 parts by weight (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Particle B-1 0.90 parts by mass (silica sol with an average particle diameter of 450 nm, solid content concentration 40% by mass)
- Polyurethane aqueous dispersion (II) 13.70 parts by mass (solid content concentration 37% by mass)
- Block isocyanate based crosslinking agent (III) 2.90 parts by mass (solid content concentration 75% by mass)
- Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass)
- Example 7 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Particle A-1 7.24 parts by weight (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Particle B-1 0.90 parts by mass (silica sol with an average particle diameter of 450 nm, solid content concentration 40% by mass)
- Polyurethane aqueous dispersion (II) 4.98 parts by mass (solid content concentration 37% by mass)
- Block isocyanate based crosslinking agent (III) 2.90 parts by mass (solid content concentration 7
- Example 8 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the blocked isocyanate-based crosslinking agent (III) in the coating solution was changed to a water-soluble resin (IV) having an oxazoline group and the content was adjusted. It was.
- Example 9 Block diisocyanate-based crosslinking agent (III) of coating solution is carbodiimide water-soluble resin (V)
- the easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the content was adjusted.
- Example 10 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the blocked isocyanate-based crosslinking agent (III) in the coating solution was changed to the melamine-based crosslinking agent (VII) and the content thereof was adjusted.
- Example 11 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the blocked isocyanate crosslinking agent (III) in the coating solution was changed to the epoxy crosslinking agent (VI) and the content thereof was adjusted.
- Example 12 An easily-adhesive polyester film was obtained in the same manner as in Example 1 except that the average particle diameter was changed to 40 nm particles A-4 instead of the coating solution particles A-1.
- Example 13 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the average particle diameter was changed to the particle A-5 having a thickness of 30 nm instead of the particle A-1 in the coating solution.
- Example 14 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the thickness of the coating layer was changed to 0.05 ⁇ m.
- Example 15 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the thickness of the coating layer was changed to 0.075 ⁇ m.
- Example 16 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the thickness of the coating layer was changed to 0.125 ⁇ m.
- Example 17 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Particle A-1 7.26 parts by mass (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Particle B-1 0.36 parts by mass (silica sol having an average particle diameter of 450 nm, solid content concentration of 40% by mass)
- Block isocyanate based crosslinking agent (III) 2.90 parts by mass (solid content concentration 75% by mass)
- Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass) High boiling
- Example 18 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Particle A-1 7.22 parts by mass (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Particle B-1 1.44 parts by mass (silica sol with an average particle diameter of 450 nm, solid concentration 40% by mass)
- Polyester aqueous dispersion (I ⁇ ) 17.88 parts by mass (solid content concentration 28.2% by mass)
- Block isocyanate based crosslinking agent (III) 2.90 parts by mass (solid content concentration 75% by mass)
- Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass)
- Example 1 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating liquid particles A-1 were replaced with non-mixed zirconia single particles A-6 containing no titania.
- Example 2 The same procedure as in Example 1 was conducted, except that the coating liquid particle A-1 was replaced with non-mixed titania-based single particle A-7 containing no zirconia and the mass% was adjusted in consideration of the solid content concentration. An easily adhesive polyester film was obtained.
- Example 3 An easy-adhesive polyester film was obtained in the same manner as in Example 1 except that the coating solution having the following composition was prepared and used instead of the coating solution prepared and used in Example 1.
- Water 35.71 parts by mass Isopropyl alcohol 30.00 parts by mass Particle A-1 7.27 parts by mass (Zirconia / titania mixed particles having an average particle diameter of 23 nm, 75% by mass of zirconia based on the total mass of zirconia / titania, Solid content concentration 13% by mass)
- Surfactant 0.30 parts by mass (Fuso-based, solid content concentration 10% by mass)
- the easy-adhesive polyester film obtained in each example has good scratch resistance, moderate static friction coefficient and dynamic friction coefficient, and is satisfactory in each evaluation item of transparency, adhesion, moist heat resistance, and low interference. A good result was obtained.
- the easily adhesive polyester film obtained in Comparative Example 1 was not satisfactory in heat and moisture resistance because the particles A in the coating layer did not contain zirconia.
- the easily adhesive polyester film obtained by Comparative Example 2 did not contain titania in the particles A in the coating layer, it was not satisfactory in scratch resistance.
- the easily adhesive polyester film obtained by the comparative example 3 does not contain the lubricant particles B in the coating layer, the coefficient of friction was large.
- Example 19 On the coating layer of the easy-adhesive polyester film obtained in Example 1, a coating solution for forming an antiglare layer having the following composition was applied using a # 5 wire bar and dried at 70 ° C. for 1 minute to remove the solvent. did. Next, the film coated with the antiglare layer was irradiated with 300 mJ / cm 2 of ultraviolet light using a high-pressure mercury lamp to obtain a laminated polyester film having an antiglare layer having a thickness of 5 ⁇ m. A preferred laminated polyester film having an antiglare property was obtained.
- Coating solution for antiglare layer formation 34 parts by mass of toluene 50 parts by mass of pentaerythritol triacrylate Silica (average particle size 1 ⁇ m) 12 parts by mass Silicone (leveling agent) 1 part by mass 1 part by weight of photopolymerization initiator (Irgacure 184 manufactured by Ciba Specialty Chemicals)
- Example 20 On the coating layer of the easily adhesive polyester film obtained in Example 1, a medium refractive index layer-forming coating solution having the following composition was coated using a bar coater, dried at 70 ° C. for 1 minute, and then using a high-pressure mercury lamp. Irradiation with ultraviolet rays of 400 mJ / cm 2 yielded a medium refractive index layer having a dry film thickness of 5 ⁇ m. Next, on the formed medium refractive index layer, using a bar coater, a coating solution for forming a high refractive index layer having the following composition is formed by the same method as that for the medium refractive index layer.
- a coating solution for forming a low refractive index layer was formed by the same method as that for the middle refractive index layer to obtain a laminated polyester film on which an antireflection layer was laminated.
- a preferred laminated polyester film having antireflection properties was obtained.
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Abstract
Description
1. 少なくとも片面に塗布層を有するポリエステルフィルムであって、前記塗布層が、ジルコニア/チタニア混合粒子A、滑剤粒子B、及びバインダー樹脂を含有し、前記ジルコニア/チタニア混合粒子Aにおけるジルコニアとチタニア合計質量に対するジルコニアの含有率が10~90質量%であり、前記滑剤粒子Bの平均粒径が200nm以上である易接着性ポリエステルフィルム。
2. ジルコニア/チタニア混合粒子Aの平均粒径が、5~200nmである上記第1に記載の易接着性ポリエステルフィルム。
3. 塗布層の固形分に対する滑剤粒子Bの含有率が、0.1~20質量%である上記第1又は第2に記載の易接着性ポリエステルフィルム。
4. 塗布層の固形分に対するジルコニア/チタニア混合粒子Aの含有率が、2~50質量%である上記第1~第3のいずれかに記載の易接着性ポリエステルフィルム。
5. 上記第1~第4のいずれかに記載の易接着性ポリエステルフィルムの塗布層上に、ハードコート層、防眩層、防眩性反射防止層、反射防止層及び低反射層からなる群より選択される1以上の機能層を有する積層ポリエステルフィルム。
本発明で基材として用いるポリエステルフィルムは、ポリエステル樹脂より構成されるフィルムであり、主に、ポリエチレンテレフタレート、ポリプロピレンテレフタレート、ポリブチレンテレフタレート、ポリエチレンナフタレートの少なくとも1種を構成成分とするポリエステルフィルムが好ましい。また、前記のようなポリエステルに第三成分モノマーが共重合ポリエステルからなるフィルムであってもよい。これらのポリエステルフィルムの中でも、物性とコストのバランスからポリエチレンテレフタレートフィルムが最も好ましい。
本発明の易接着性ポリエステルフィルムは、上記のようなポリエステル製の基材フィルム上に易接着性の塗布層が積層されているものである。塗布層中は、ジルコニア/チタニア混合粒子A(以下、単に粒子Aと記す場合がある)、滑剤粒子B(以下、単に粒子Bと記す場合がある)、及びバインダー樹脂を含んでいる。
本発明の光学用易接着性ポリエステルフィルムは、一般的なポリエステルフィルムの製造方法に従って製造することができる。例えば、ポリエステル樹脂を溶融し、シート状に押出し成形された無配向ポリエステルをガラス転移温度以上の温度において、ロールの速度差を利用して縦方向に延伸した後、テンターにより横方向に延伸し、熱処理を施す方法が挙げられる。
本発明の主に光学用途に用いられる積層ポリエステルフィルムは、本発明の易接着性ポリエステルフィルムの塗布層上に、電子線または紫外線硬化型アクリル樹脂またはシロキサン系熱硬化性樹脂等からなるハードコート層等を設けることにより得られる。
本発明における積層ポリエステルフィルムの製造方法について、易接着性ポリエステルフィルムを例にして説明するが、当然これに限定されるものではない。
〔走査型電子顕微鏡による測定法〕
上記の粒子の平均粒径の測定は下記の方法により行うことができる。粒子を走査型電子顕微鏡(SEM)で写真を撮り、最も小さい粒子1個の大きさが2~5mmとなるような倍率で、300~500個の粒子の最大径(最も離れた2点間の距離)を測定し、その平均値を平均粒径とする。本発明における塗布層中に存在する粒子の平均粒径は当該測定方法により測定できる。
粒子の平均粒径は、粒子やフィルムの製造時においては動的散乱法により求めることもできる。ゾルを分散媒で希釈し、分散媒のパラメーターを用いてサブミクロン粒子アナライザーN4 PLUS(ベックマン・コールター社製)にて測定し、キュムラント法にて演算することで平均粒子径を得た。動的光散乱法ではゾル中の粒子の平均粒子径が観測され、粒子同士の凝集があるときは、それらの凝集粒子の平均粒子径が観測される。
粒子の屈折率測定は下記の方法により行うことができる。無機粒子を150℃で乾燥後、乳鉢で粉砕した粉末を、溶媒1(粒子より低屈折率のもの)に浸漬した後、溶媒2(粒子より高屈折率のもの)を少量ずつ微粒子がほぼ透明になるまで添加した。この液の屈折率をアッベの屈折計(株式会社アタゴ製アッベ屈折率計)を用いて測定した。測定は23℃、D線(波長589nm)で行われた。上記溶媒1と溶媒2は互いに混合可能なものを選定し、屈折率に応じて、例えば1,1,1,3,3,3-ヘキサフルオロ-2-プロパノール、2-プロパノール、クロロホルム、四塩化炭素、トルエン、グリセリン等の溶媒が挙げられる。
易接着性ポリエステルフィルムのヘイズはJIS K 7136:2000に準拠し、濁度計(日本電色製、NDH2000)を用いて測定した。
実施例で得られたポリエステルフィルムの易接着層上に、前述のハードコート層の形成の項目で記述したハードコート層を形成した。ハードコートを形成した易接着用ポリエステルフィルムをJIS-K5400-1990の8.5.1の記載に準拠し、ハードコート層と基材フィルムとの密着性を求める。
密着性(%)={1-(剥がれたマス目の数/100)}×100
前記のハードコートを形成した偏光子保護用積層フィルムを、高温高湿槽中で85℃、85RH%の環境下500時間放置し、次いで、ハードコート積層偏光子保護フィルムを取りだし、室温で12時間放置した。その後、前記と同様の方法でハードコート層と基材フィルムとの密着性を求めて、耐湿熱性とした。
実施例で得られたポリエステルフィルムの摩擦係数はJIS K7125-1999 プラスチック-フィルムおよびシート摩擦係数試験方法に準拠し、テンシロン(東洋ボールドウィン、RTM-100)を用いて測定した。
各実施例で得られた光学用易接着ポリエステルフィルムの易接着層上にハードコート層を形成した。ハードコートを形成した光学用易接着ポリエステルフィルムを10cm(フィルム幅方向)×15cm(フィルム長手方向)の面積に切り出し、試料フィルムを作成した。得られた試料フィルムのハードコート層面とは反対面に、黒色光沢テープ(日東電工株式会社製、ビニルテープ No21;黒)を貼り合わせた。この試料フィルムのハードコート面を上面にして、3波長形昼白色(ナショナル パルック、F.L 15EX-N 15W)を光源として、斜め上から目視でもっとも反射が強く見える位置関係(光源からの距離40~60cm、15~45°の角度)で観察した。
◎:あらゆる角度からの観察でも虹彩状色彩が見られない
○:ある角度によっては僅かに虹彩状色彩が見られる
△:僅かに虹彩状色彩が観察される
×:はっきりとした虹彩状色彩が観察される
摩擦堅牢度試験機(大栄科学精器製作所製、RT-200)に光学用易接着性ポリエステルフィルムを3cm(フィルム幅方向)×20cm(フィルム長手方向)を取り付け、おもり(300g)を付けた荷重ヘッド部(2cmx2cm、200g)と試料フィルムの接触部に黒台紙(厚さ80μm、算術的平均表面粗さ0.03μm)を用い、10c
mの距離を1往復20秒の速度で3往復させた。黒台紙の上に得られた試料フィルムを
のせ、傷が付いているか目視で確認した。
○:黒台紙上で傷付きが確認できない、又は場所によってわずかな傷付きが確認できる
△:黒台紙上で全体的にわずかな傷付きが確認できる
×:黒台紙上で傷付きがはっきりと確認できる
JIS K7121-1987に準拠し、示差走査熱量計(セイコーインスツルメンツ製、DSC6200)を使用して、樹脂サンプル10mgを25~300℃の温度範囲にわたって20℃/minで昇温させ、DSC曲線から得られた補外ガラス転移開始温度をガラス転移温度とした。
樹脂0.03gをテトラヒドロフラン 10ml に溶かし、GPC-LALLS装置低角度光散乱光度計 LS-8000(東ソー株式会社製、テトラヒドロフラン溶媒、リファレンス:ポリスチレン)を用い、カラム温度30℃、流量1ml/分、カラム(昭和電工社製shodex KF-802、804、806)を用い、数平均分子量を測定した。
樹脂を重クロロホルムに溶解し、ヴァリアン社製核磁気共鳴分析計(NMR)ジェミニ-200を用いて、1H-NMR分析を行ってその積分比より各組成のモル%比を決定した。
JIS-B0601-2001に基づいて、サーフコム(登録商標)304B(株式会社東京精密製)にてRaを測定した。なお測定条件は、カットオフ0.08μm、触針半径2μm、測定長0.8mm、測定速度0.03mm/秒で行った。
攪拌機、温度計、および部分還流式冷却器を具備するステンレススチール製オートクレーブに、ジメチルテレフタレート194.2質量部、ジメチルイソフタレート184.5質量部、ジメチルー5-ナトリウムスルホイソフタレート14.8質量部、ジエチレングリコール233.5質量部、エチレングリコール136.6質量部、およびテトラーnーブチルチタネート0.2質量部を仕込み、160℃から220℃の温度で4時間かけてエステル交換反応を行なった。次いで255℃まで昇温し、反応系を徐々に減圧した後、30Paの減圧下で1時間30分反応させ、共重合ポリエステル樹脂(I)を得た。得られた共重合ポリエステル樹脂(I)は、淡黄色透明であった。共重合ポリエステル樹脂(I)の還元粘度を測定したところ,0.70dl/gであった。DSCによるガラス転移温度は40℃、数平均分子量は20000であった。
共重合ポリエステル樹脂(I)の組成は以下の通りである。
・ジカルボン酸成:分テレフタル酸49モル%、イソフタル酸48モル%、5-ナトリウムイソフタル酸3モル%
・ジオール成分:エチレングリコール40モル%、ジエチレングリコール60モル%
攪拌機、温度計と還流装置を備えた反応器に、共重合ポリエステル樹脂(I)30質量部、エチレングリコール-n-ブチルエーテル15質量部を入れ、110℃で加熱、攪拌し樹脂を溶解した。樹脂が完全に溶解した後、水55質量部をポリエステル溶液に攪拌しつつ徐々に添加した。添加後、液を攪拌しつつ室温まで冷却して、固形分28.2質量%の乳白色のポリエステル水分散体(Iα)を作製した。
撹拌機、ジムロート冷却器、窒素導入管、シリカゲル乾燥管、及び温度計を備えた4つ口フラスコに、4,4-ジシクロヘキシルメタンジイソシアネート43.75質量部、ジメチロールブタン酸12.85質量部、数平均分子量2000のポリヘキサメチレンカーボネートジオール153.41質量部、ジブチルスズジラウレート0.03質量部、及び溶剤としてアセトン84.00質量部を投入し、窒素雰囲気下、75℃において3時間撹拌し、反応液が所定のアミン当量に達したことを確認した。次に、この反応液を40℃にまで降温した後、トリエチルアミン8.77質量部を添加し、ポリウレタンプレポリマー溶液を得た。次に、高速攪拌可能なホモディスパーを備えた反応容器に、水450gを添加して、25℃に調整して、2000min-1で攪拌混合しながら、ポリウレタンプレポリマー溶液を添加して水分散した。その後、減圧下で、アセトンおよび水の一部を除去することにより、固形分37質量%の水溶性ポリウレタン樹脂溶液(II)を調製した。得られたポリウレタン樹脂(II)のガラス転移点温度は-30℃であった。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネートを原料としたイソシアヌレート構造を有するポリイソシアネート化合物(旭化成ケミカルズ製、デュラネートTPA)100質量部、プロピレングリコールモノメチルエーテルアセテート55質量部、ポリエチレングリコールモノメチルエーテル(平均分子量750)30質量部を仕込み、窒素雰囲気下、70℃で4時間保持した。その後、反応液温度を50℃に下げ、メチルエチルケトオキシム47質量部を滴下した。反応液の赤外スペクトルを測定し、イソシアネート基の吸収が消失したことを確認し、固形分75質量%のブロックポリイソシアネート水分散液(III)を得た。
温度計、窒素ガス導入管、還流冷却器、滴下ロート、および攪拌機を備えたフラスコに水性媒体としてのイオン交換水58質量部とイソプロパノール58質量部との混合物、および、重合開始剤(2,2’-アゾビス(2-アミジノプロパン)・二塩酸塩)4質量部を投入した。一方、滴下ロートに、オキサゾリン基を有する重合性不飽和単量体としての2-イソプロペニル-2-オキサゾリン16質量部、メトキシポリエチレングリコールアクリレート(エチレングリコールの平均付加モル数・9モル、新中村化学製)32質量部、およびメタクリル酸メチル32質量部の混合物を投入し、窒素雰囲気下、70℃において1時間にわたり滴下した。滴下終了後、反応溶液を9時間攪拌し、冷却することで固形分濃度40質量%のオキサゾリン基を有する水溶性樹脂(IV)を得た。
撹拌機、温度計、還流冷却管を備えたフラスコにヘキサメチレンジイソシアネート168質量部とポリエチレングリコールモノメチルエーテル(M400、平均分子量400)220質量部を仕込み、120℃で1時間、撹拌し、更に4,4’-ジシクロヘキシルメタンジイソシアネート26質量部とカルボジイミド化触媒として3-メチル-1-フェニル-2-フォスフォレン-1-オキシド3.8質量部(全イソシイアネートに対し2質量%)を加え、窒素気流下185℃で更に5時間撹拌した。反応液の赤外スペクトルを測定し、波長2200~2300cm-1の吸収が消失したことを確認した。60℃まで放冷し、イオン交換水を567質量部加え、固形分40質量%のカルボジイミド水溶性樹脂(V)を得た。
エポキシ系架橋剤として、ナガセケムテックス社製 デナコールEX-521(固形分濃度100%)を使用した(エポキシ系架橋剤(VI))。
メラミン系架橋剤として、DIC社製 ベッカミンM-3(固形分濃度60%)を使用した(メラミン系架橋剤(VII))。
3リットルのガラス製容器に、純水2283.6gとシュウ酸二水和物403.4gとを投入し、40℃に加熱して10.72質量%シュウ酸水溶液を調製した。この水溶液を撹拌しながら、オキシ炭酸ジルコニウム粉末(ZrOCO3、AMR International Corp.製、ZrO2に換算して39.76質量%を含有する。)495.8gを徐々に添加し30分間混合した後、90℃で30分の加熱を行った。次いで、25.0質量%水酸化テトラメチルアンモニウム水溶液(多摩化学工業(株)製)1747.2gを1時間かけて徐々に添加した。この時点で混合液はスラリー状であり、ZrO2換算で4.0質量%含有した。このスラリーをステンレス製オートクレーブ容器に移し替え、145℃で5時間の水熱処理を行った。この水熱処理後の生成物は、未解膠物がなく完全にゾル化した。得られたゾルは、ZrO2として4.0質量%含有し、pH6.8、動的光散乱法による平均粒子径は19nmであった。また、ゾルをZrO2濃度2.0質量%に純水で調整して測定した透過率は88%であった。透過型電子顕微鏡により粒子を観察したところ、7nm前後のZrO2一次粒子の凝集粒子がほとんどであった。上記の水熱処理を行って得られたZrO2濃度4.0質量%のジルコニアゾル4000gを限外濾過装置を使用して、純水を徐々に添加しながら洗浄及び濃縮を行って、ZrO2濃度13.1質量%、pH4.9、ZrO2濃度13.1質量%のときの透過率76%のジルコ
ニアゾル953gが得られた。
四塩化チタン(大阪チタニウムテクノロジ-ズ(株)製)をTiO2換算基準で7.75質量%含む四塩化チタン水溶液12.09kgと、アンモニアを15質量%含むアンモニア水(宇部興産(株)製)4.69kgとを混合し、pH9.5の白色スラリー液を調製した。次いで、このスラリーを濾過した後、純水で洗浄して、固形分含有量が10質量%の含水チタン酸ケーキ9.87kgを得た。次に、このケーキに、過酸化水素を35質量%含む過酸化水素水(三菱瓦斯化学(株)製)11.28kgと純水20.00kgとを加えた後、80℃の温度で1時間、撹拌下で加熱し、さらに純水57.52kgを加えて、過酸化チタン酸をTiO2換算基準で1質量%含む過酸化チタン酸水溶液を98.67kg得た。この過酸化チタン酸水溶液は、透明な黄褐色でpHは8.5であった。
上記で得られたジルコニア粒子とチタニア粒子をそれぞれの比率で混合することで固形分濃度13質量%のジルコニア/チタニア混合粒子を作成した。
後述する実施例で製造したポリエステルフィルムの偏光子と接着する面とは反対側の面に、下記組成のハードコート層形成用塗布液を#10ワイヤーバーを用いて塗布し、70℃で1分間乾燥し、溶剤を除去した。次いで、ハードコート層を塗布したフィルムに高圧水銀灯を用いて300mJ/cm2の紫外線を照射し、厚み5μmのハードコート層を有
する偏光子保護フィルムを得た。
・ハードコート層形成用塗布液
メチルエチルケトン 65.00質量%
ジペンタエリスリトールヘキサアクリレート 27.20質量%
(新中村化学製A-DPH)
ポリエチレンジアクリレート 6.80質量%
(新中村化学製A-400)
光重合開始剤 1.00質量%
(チバスペシャリティーケミカルズ社製イルガキュア184)
(塗布液の調整)
下記の組成の塗布液を調整した。
水 34.94質量部
イソプロピルアルコール 30.00質量部
粒子A-1 7.24質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 0.90質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリエステル水分散体(Iα) 17.92質量部
(固形分濃度28.2質量%)
ブロックイソシアネート系架橋剤(III) 2.90質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.26質量部
フィルム原料ポリマーとして、固有粘度(溶媒:フェノール/テトラクロロエタン=60/40)が0.62dl/gで、かつ粒子を実質上含有していないPET樹脂ペレットを、133Paの減圧下、135℃で6時間乾燥した。その後、押し出し機に供給し、約280℃でシート状に溶融押し出しして、表面温度20℃に保った回転冷却金属ロール上で急冷密着固化させ、未延伸PETシートを得た。
塗布液の粒子A-1の代わりに、ジルコニアとチタニアの合計質量に対するジルコニアの質量の割合が50質量%の粒子A-2に変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液の粒子A-1の代わりに、ジルコニアとチタニアの合計質量に対するジルコニアの質量の割合が25質量%の粒子A-3に変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 37.23質量部
イソプロピルアルコール 30.00質量部
粒子A-1 3.79質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 0.95質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリエステル水分散体(Iα) 18.77質量部
(固形分濃度28.2質量%)
ブロックイソシアネート系架橋剤(III) 3.03質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.27質量部
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 32.85質量部
イソプロピルアルコール 30.00質量部
粒子A-1 10.39質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 0.87質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリエステル水分散体(Iα) 17.15質量部
(固形分濃度28.2質量%)
ブロックイソシアネート系架橋剤(III) 2.80質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.25質量部
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 39.17質量部
イソプロピルアルコール 30.00質量部
粒子A-1 7.24質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 0.90質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリウレタン水分散体(II) 13.70質量部
(固形分濃度37質量%)
ブロックイソシアネート系架橋剤(III) 2.90質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.26質量部
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 34.94質量部
イソプロピルアルコール 30.00質量部
粒子A-1 7.24質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 0.90質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリエステル水分散体(Iα) 13.27質量部
(固形分濃度28.2質量%)
ポリウレタン水分散体(II) 4.98質量部
(固形分濃度37質量%)
ブロックイソシアネート系架橋剤(III) 2.90質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.26質量部
塗布液のブロックイソシアネート系架橋剤(III)をオキサゾリン基を有する水溶性樹
脂(IV)に変更して、その含有量を調節した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液のブロックイソシアネート系架橋剤(III)をカルボジイミド水溶性樹脂(V)
に変更して、その含有量を調節した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液のブロックイソシアネート系架橋剤(III)をメラミン系架橋剤(VII)に変更して、その含有量を調節した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液のブロックイソシアネート系架橋剤(III)をエポキシ系架橋剤(VI)に変更し
て、その含有量を調節した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液の粒子A-1の代わりに、平均粒径を40nmの粒子A-4に変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液の粒子A-1の代わりに、平均粒径を30nmの粒子A-5に変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布層の膜厚を0.05μmに変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布層の膜厚を0.075μmに変更した以外は、実施例1と同様にして易接着性ポリ
エステルフィルムを得た。
塗布層の膜厚を0.125μmに変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 35.40質量部
イソプロピルアルコール 30.00質量部
粒子A-1 7.26質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 0.36質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリエステル水分散体(Iα) 17.98質量部
(固形分濃度28.2質量%)
ブロックイソシアネート系架橋剤(III) 2.90質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.26質量部
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 34.48重量部
イソプロピルアルコール 30.00質量部
粒子A-1 7.22質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
粒子B-1 1.44質量部
(平均粒径450nmのシリカゾル、固形分濃度40質量%)
ポリエステル水分散体(Iα) 17.88質量部
(固形分濃度28.2質量%)
ブロックイソシアネート系架橋剤(III) 2.90質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.26質量部
塗布液の粒子A-1の代わりに、チタニアを含有しない非混合ジルコニア単独粒子A-6に変更した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
塗布液の粒子A-1の代わりに、ジルコニアを含有しない非混合チタニア系単独粒子A-7に変更し、固形分濃度を考慮して質量%を調整した以外は、実施例1と同様にして易接着性ポリエステルフィルムを得た。
実施例1で調整、使用した塗布液に代えて、下記の組成の塗布液を調整、使用した他は実施例1と同様にして易接着性ポリエステルフィルムを得た。
水 35.71質量部
イソプロピルアルコール 30.00質量部
粒子A-1 7.27質量部
(平均粒径23nmのジルコニア/チタニア混合粒子、
ジルコニア/チタニア合計質量に対するジルコニア質量75質量%、
固形分濃度13質量%)
ポリエステル水分散体(Iα) 28.58質量部
(固形分濃度28.2質量%)
ブロックイソシアネート系架橋剤(III) 1.38質量部
(固形分濃度75質量%)
界面活性剤 0.30質量部
(フッソ系、固形分濃度10質量%)
高沸点溶媒 3.00質量部
分散助剤 0.26質量部
実施例1において得られた易接着性ポリエステルフィルムの塗布層上に、下記組成の防眩層形成用塗布液を#5ワイヤーバーを用いて塗布し、70℃で1分間乾燥し、溶剤を除去した。次いで、防眩層を塗布したフィルムに高圧水銀灯を用いて300mJ/cm2の
紫外線を照射し、厚み5μmの防眩層を有する積層ポリエステルフィルムを得た。防眩性の付与された好ましい積層ポリエステルフィルムが得られた。
・防眩層形成用塗布液
トルエン 34質量部
ペンタエリスリトールトリアクリレート 50質量部
シリカ(平均粒径1μm) 12質量部
シリコーン(レベリング剤) 1質量部
光重合開始剤 1質量部
(チバスペシャリティーケミカルズ社製イルガキュア184)
実施例1において得られた易接着性ポリエステルフィルムの塗布層上に、下記組成の中屈折率層形成用塗布液をバーコーターを用いて塗布し、70℃1分間乾燥後、高圧水銀灯を用いて400mJ/cm2の紫外線を照射し、乾燥膜厚5μmの中屈折率層を得た。次
に、形成した中屈折率層の上に、バーコーターを用いて、下記組成の高屈折率層形成用塗布液を中屈折率層と同様の方法で形成し、さらにその上に下記組成の低屈折率層形成用塗布液を中屈折率層と同様の方法で形成し、反射防止層を積層した積層ポリエステルフィルムを得た。反射防止性を有する好ましい積層ポリエステルフィルムが得られた。
・中屈折率層形成用塗布液(屈折率1.52)
ジペンタエリスリトールヘキサアクリレート 70質量部
1,6-ビス(3-アクリロイルオキシ-2-ヒドロキシプロピルオキシ)ヘキサン
30質量部
光重合開始剤 4質量部
(チバスペシャルティケミカルズ(株)製、イルガキュア184)
イソプロパノール 100質量部
・高屈折率層形成用塗布液(屈折率1.64)
ITO微粒子(平均粒径0.07μm) 85質量部
テトラメチロールメタントリアクリレート 15質量部
光重合開始剤(KAYACURE BMS、日本化薬製) 5質量部
ブチルアルコール 900質量部
・低屈折率層形成用塗布液(屈折率1.42)
1,10-ジアクリロイルオキシ-2,2,3,3,4,4,5,5,6,6,7,7,8,8,9,9-ヘキサデカフルオロデカン 70質量部
ジペンタエリスリトールヘキサアクリレート 10質量部
シリカゲル微粒子(XBA-ST、日産化学製) 60質量部
光重合開始剤(KAYACURE BMS、日本化薬製) 5質量部
Claims (5)
- 少なくとも片面に塗布層を有するポリエステルフィルムであって、前記塗布層が、ジルコニア/チタニア混合粒子A、滑剤粒子B、及びバインダー樹脂を含有し、前記ジルコニア/チタニア混合粒子Aにおけるジルコニアとチタニア合計質量に対するジルコニアの含有率が10~90質量%であり、前記滑剤粒子Bの平均粒径が200nm以上である易接着性ポリエステルフィルム。
- ジルコニア/チタニア混合粒子Aの平均粒径が、5~200nmである請求項1に記載の易接着性ポリエステルフィルム。
- 塗布層の固形分に対する滑剤粒子Bの含有率が、0.1~20質量%である請求項1又は2に記載の易接着性ポリエステルフィルム。
- 塗布層の固形分に対するジルコニア/チタニア混合粒子Aの含有率が、2~50質量%である請求項1~3のいずれかに記載の易接着性ポリエステルフィルム。
- 請求項1~4のいずれかに記載の易接着性ポリエステルフィルムの塗布層上に、ハードコート層、防眩層、防眩性反射防止層、反射防止層及び低反射層からなる群より選択される1以上の機能層を有する積層ポリエステルフィルム。
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