Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
  • B32B7/04—Interconnection of layers
  • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B27/00—Layered products comprising a layer of synthetic resin
  • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
• • 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
  • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/0804—Manufacture of polymers containing ionic or ionogenic groups
  • C08G18/0819—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups
  • C08G18/0823—Manufacture of polymers containing ionic or ionogenic groups containing anionic or anionogenic groups containing carboxylate salt groups or groups forming them
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/08—Processes
  • C08G18/10—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step
  • C08G18/12—Prepolymer processes involving reaction of isocyanates or isothiocyanates with compounds having active hydrogen in a first reaction step using two or more compounds having active hydrogen in the first polymerisation step
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/2805—Compounds having only one group containing active hydrogen
  • C08G18/2815—Monohydroxy compounds
  • C08G18/283—Compounds containing ether groups, e.g. oxyalkylated monohydroxy compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/30—Low-molecular-weight compounds
  • C08G18/32—Polyhydroxy compounds; Polyamines; Hydroxyamines
  • C08G18/3271—Hydroxyamines
  • C08G18/3275—Hydroxyamines containing two hydroxy groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/40—High-molecular-weight compounds
  • C08G18/42—Polycondensates having carboxylic or carbonic ester groups in the main chain
  • C08G18/44—Polycarbonates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6633—Compounds of group C08G18/42
  • C08G18/6637—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38
  • C08G18/664—Compounds of group C08G18/42 with compounds of group C08G18/32 or polyamines of C08G18/38 with compounds of group C08G18/3203
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6633—Compounds of group C08G18/42
  • C08G18/6659—Compounds of group C08G18/42 with compounds of group C08G18/34
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/28—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the compounds used containing active hydrogen
  • C08G18/65—Low-molecular-weight compounds having active hydrogen with high-molecular-weight compounds having active hydrogen
  • C08G18/66—Compounds of groups C08G18/42, C08G18/48, or C08G18/52
  • C08G18/6666—Compounds of group C08G18/48 or C08G18/52
  • C08G18/6692—Compounds of group C08G18/48 or C08G18/52 with compounds of group C08G18/34
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G18/00—Polymeric products of isocyanates or isothiocyanates
  • C08G18/06—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen
  • C08G18/70—Polymeric products of isocyanates or isothiocyanates with compounds having active hydrogen characterised by the isocyanates or isothiocyanates used
  • C08G18/72—Polyisocyanates or polyisothiocyanates
  • C08G18/74—Polyisocyanates or polyisothiocyanates cyclic
  • C08G18/75—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic
  • C08G18/758—Polyisocyanates or polyisothiocyanates cyclic cycloaliphatic containing two or more cycloaliphatic rings
• • 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
  • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
  • C08J5/18—Manufacture of films or sheets
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/22—Plastics; Metallised plastics
  • C09J7/25—Plastics; Metallised plastics based on macromolecular compounds obtained otherwise than by reactions involving only carbon-to-carbon unsaturated bonds
  • C09J7/255—Polyesters
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J7/00—Adhesives in the form of films or foils
  • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
  • C09J7/29—Laminated material
• • 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
• • 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
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/02—Diffusing elements; Afocal elements
• • G—PHYSICS
  • G02—OPTICS
  • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
  • G02B5/00—Optical elements other than lenses
  • G02B5/20—Filters
  • G02B5/208—Filters for use with infrared or ultraviolet radiation, e.g. for separating visible light from infrared and/or ultraviolet radiation
• • 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
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
  • B32B2307/202—Conductive
• • 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
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/30—Properties of the layers or laminate having particular thermal properties
  • B32B2307/306—Resistant to heat
• • 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
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/40—Properties of the layers or laminate having particular optical properties
  • B32B2307/412—Transparent
• • 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
  • B32B2307/00—Properties of the layers or laminate
  • B32B2307/70—Other properties
  • B32B2307/726—Permeability to liquids, absorption
  • B32B2307/7265—Non-permeable
• • 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
  • B32B2457/202—LCD, i.e. liquid crystal displays
• • 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
  • B32B2551/00—Optical elements
• • C—CHEMISTRY; METALLURGY
  • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
  • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
  • C09J2467/00—Presence of polyester
  • C09J2467/006—Presence of polyester in the substrate

Definitions

• the present invention relates to an optically easy-adhesive polyester film excellent in adhesion and heat and moisture resistance.
• optical functional films such as hard coat films, antireflection films, light diffusion sheets, prismatic lens sheets, near-infrared shielding films, transparent conductive films, and antiglare films, which are mainly used for displays and the like.
• the present invention relates to a suitable optically easy-adhesive polyester film.
• the base material of an optical functional film used as a member of a liquid crystal display is a transparent thermoplastic made of polyethylene terephthalate (PET), acrylic, polycarbonate (PC), triacetyl cellulose (TAC), polyolefin, or the like.
• PET polyethylene terephthalate
• PC polycarbonate
• TAC triacetyl cellulose
• polyolefin polyolefin
• thermoplastic resin film When using the thermoplastic resin film as a base material for various optical functional films, functional layers corresponding to various applications are laminated. For example, in a liquid crystal display (LCD), a protective film (hard coat layer) that prevents scratches on the surface, an antireflection layer (AR layer) that prevents reflection of external light, and a prism layer that is used to collect and diffuse light And a functional layer such as a light diffusion layer for improving luminance.
• a protective film hard coat layer
• AR layer antireflection layer
• prism layer that is used to collect and diffuse light
• a functional layer such as a light diffusion layer for improving luminance.
• a functional layer such as a light diffusion layer for improving luminance.
• polyester films are widely used as substrates for various optical functional films because they are excellent in transparency, dimensional stability and chemical resistance and are relatively inexpensive.
• thermoplastic film such as a biaxially oriented polyester film or a biaxially oriented polyamide film
• the film surface is highly crystallized, so it has good adhesion to various paints, adhesives, inks, etc.
• a method of providing easy adhesion to a base film by providing a coating layer mainly composed of various resins such as polyester, acrylic, polyurethane, and acrylic graft polyester on the surface of the base polyester film is generally used.
• the polyester film before the completion of crystal orientation is coated on the base film with an aqueous coating solution containing the resin solution or a dispersion in which the resin is dispersed in a dispersion medium, and after drying, Stretch at least uniaxially, then heat treatment to complete the orientation of the polyester film (so-called in-line coating method), after the production of the polyester film, after applying a water-based or solvent-based coating liquid to the film, A drying method (so-called off-line coating method) is industrially implemented.
• LCDs displays such as PDPs
• portable devices using hard coat films as members are used in various environments, both indoors and outdoors.
• portable devices may require moisture and heat resistance that can withstand a bathroom, a hot and humid area, and the like.
• the optical functional film used for such applications is required to have high adhesion such that delamination does not occur even under high temperature and high humidity. Therefore, in the following patent document, an easy-adhesive polyester film imparted with moisture and heat resistance is disclosed by adding a crosslinking agent to the coating solution and forming a crosslinked structure in the coating layer resin when forming the coating layer by the in-line coating method. Yes.
• the optical functional film used as a member also needs to maintain adhesiveness for a long time even under high temperature and high humidity.
• the easy-adhesion film as disclosed in the above-mentioned patent document shows good adhesion at first, but a decrease in adhesion strength is inevitable in long-term use under high temperature and high humidity. . Due to such a decrease in adhesion, there is a problem that the initial performance is not maintained for a long time.
• the present invention provides an easy-to-adhere polyester film for optical use that hardly causes a decrease in adhesion under high temperature and high humidity, which has been conventionally considered to be unavoidable.
• the adhesiveness under high temperature and high humidity referred to in the present invention is a layer of a photocurable acrylic layer, placed in an environment of 80 ° C., 95% RH, 48 hours, and using a cutter guide with a gap interval of 2 mm, Apply 100 cell-shaped cuts that penetrate the photocurable acrylic layer to the base film on the surface of the photocurable acrylic layer, then apply cellophane adhesive tape to the cell-shaped cut surface, and rub it with an eraser to complete Means the adhesiveness when the same part is peeled off 5 times vigorously, and the adhesiveness is based on stricter criteria than the evaluation method described in JIS K5600-5-6, which is generally used. Therefore, it is a problem that the adhesiveness under such high temperature and high humidity shows the adhesiveness equal to or higher than the initial adhesiveness.
• the present inventor has achieved adhesion at high temperature and high humidity by using a coating layer containing a urethane resin having a polycarbonate polyol as a constituent and a resin having an oxazoline group.
• the present inventors have found that it has been improved and have arrived at the present invention.
• Easy-adhesive polyester film for optics (2) The easily adhesive polyester film for optics, wherein the urethane resin has a polyoxyalkylene group.
• the easily adhesive polyester film for optics, wherein the resin having an oxazoline group is water-soluble and has a haze of 2.5% or less.
• At least one layer selected from a hard coat layer, a light diffusion layer, a prismatic lens layer, an electromagnetic wave absorption layer, a near-infrared shielding layer, and a transparent conductive layer is formed on the coating layer of the optically easily adhesive polyester film.
• An optical laminated polyester film obtained by laminating optical functional layers.
• the easily adhesive polyester film for optics of the present invention is excellent in adhesiveness (wet heat resistance) with an optical functional layer under high temperature and high humidity. Therefore, as a preferred embodiment, the adhesion at the high temperature and high humidity treatment is equal to or improved from the initial adhesion. As a preferred embodiment of the present invention, when the optically easy-adhesive polyester film of the present invention is used as a substrate for a lens sheet, the adhesion with the lens layer under high temperature and high humidity is good.
• the polyester resin constituting the polyester film used as a substrate in the present invention includes polyethylene terephthalate, polybutylene terephthalate, polyethylene-2,6-naphthalate, polymethylene terephthalate, and copolymer components such as diethylene glycol, neopentyl glycol, poly
• a polyester resin obtained by copolymerizing a diol component such as alkylene glycol or a dicarboxylic acid component such as adipic acid, sebacic acid, phthalic acid, isophthalic acid, or 2,6-naphthalenedicarboxylic acid can be used.
• the polyester resin suitably used in the present invention mainly contains at least one of polyethylene terephthalate, polypropylene terephthalate, polybutylene terephthalate, and polyethylene naphthalate as a constituent component.
• polyethylene terephthalate is most preferable from the balance between physical properties and cost.
• these polyester films can improve chemical resistance, heat resistance, mechanical strength, etc. by biaxially stretching.
• the biaxially stretched 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. Examples of 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 film of the present invention is used as a base film for an optical member, it is required to have excellent handling properties while maintaining high transparency.
• the total light transmittance of the optically easy-adhesive polyester film is preferably 85% or more, more preferably 87% or more, and 88% or more. More preferably, 89% or more is further more preferable, and 90% or more is particularly preferable.
• the content of inert particles in the base film is as small as possible. Therefore, it is a preferred embodiment that a multilayer structure in which particles are contained only in the surface layer of the film is used, or that the particles are substantially not contained in the film and fine particles are contained only in the coating layer.
• an inorganic and / or heat-resistant polymer particle is contained in the aqueous coating solution in order to improve the handleability of the film. It is also preferable to form irregularities on the surface of the coating layer.
• substantially no inert particles means, for example, in the case of inorganic particles, when the element derived from the particles is quantitatively analyzed by fluorescent X-ray analysis, 50 ppm or less, preferably 10 ppm or less, Preferably, the content is below the detection limit. This means that even if particles are not actively added to the base film, contaminants derived from foreign substances and raw material resin or dirt adhering to the line or equipment in the film manufacturing process will be peeled off and mixed into the film. It is because there is a case to do.
• Coating layer It is important to provide a coating layer containing, as main components, a urethane resin containing polycarbonate polyol as a constituent component and a resin having an oxazoline group in the easily adhesive polyester film for optics of the present invention.
• the “main component” means that 50% by mass or more is contained in the total solid component contained in the coating layer.
• Patent Documents 1 to 3 in the conventional technical common sense, it was considered desirable to positively introduce a crosslinked structure in the formation of the coating layer from the viewpoint of improving the heat and moisture resistance of the coating layer.
• the present invention by combining a polyurethane resin and a resin having an oxazoline group, a remarkable effect that adhesion is improved under wet heat has been found, and the present invention has been achieved.
• the mechanism by which the adhesiveness under high temperature and high humidity is improved by such a configuration is not well understood, the present inventor thinks as follows.
• the polyester resin constituting the base material is hydrolyzed under a high temperature and high humidity environment, the ester bond is broken, and a carboxylic acid group terminal is generated.
• the unreacted oxazoline group remaining in the coating layer reacts with the generated carboxylic acid terminal to form a crosslink.
• the more excellent heat-and-moisture resistance can be exhibited by using the polycarbonate-type urethane resin excellent in durability.
• the present invention can improve the adhesion (humidity heat resistance) to the lens layer and other optical functional layers under high temperature and high humidity according to the above-described embodiment. Further, the configuration of the present invention will be described in detail below.
• the urethane resin of the present invention includes at least a polyol component and a polyisocyanate component as constituent components, and further includes a chain extender as necessary.
• the urethane resin of the present invention is a polymer compound in which these constituent components are mainly copolymerized by urethane bonds.
• it has the polycarbonate polyol as a structural component of a urethane resin, It is characterized by the above-mentioned.
• Moisture heat resistance can be improved by including a urethane resin containing polycarbonate as a constituent component in the coating layer of the present invention.
• the components of these urethane resins can be specified by nuclear magnetic resonance analysis or the like.
• polycarbonate diol examples include ethylene glycol, propylene glycol, 1,3-propanediol, 1,4-butanediol, 1,5-pentanediol, and 3-methyl-1,5.
• a polycarbonate diol obtained by reacting one or more diols such as bisphenol-A with carbonates such as dimethyl carbonate, diphenyl carbonate, ethylene carbonate, and phosgene. And the like.
• the number average molecular weight of the polycarbonate diol is preferably 300 to 5000, and more preferably 500 to 3000.
• the composition molar ratio of the polycarbonate polyol which is a constituent component of the urethane resin, is preferably 3 to 100 mol% when the total polyisocyanate component of the urethane resin is 100 mol%, preferably 5 to 50 mol%. More preferably, it is 6 to 20 mol%.
• the composition molar ratio is low, the durability effect by the polycarbonate polyol may not be obtained.
• the said composition molar ratio is high, initial adhesiveness may fall.
• aromatic diisocyanates such as 4,4-diphenylmethane diisocyanate
• aromatic aliphatic diisocyanates such as x
• Chain extenders include glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and 1,6-hexanediol, polyhydric alcohols such as glycerin, trimethylolpropane, and pentaerythritol, ethylenediamine Diamines such as hexamethylenediamine and piperazine, aminoalcohols such as monoethanolamine and diethanolamine, thiodiglycols such as thiodiethylene glycol, and water.
• glycols such as ethylene glycol, diethylene glycol, 1,4-butanediol, neopentyl glycol and 1,6-hexanediol
• polyhydric alcohols such as glycerin, trimethylolpropane, and pentaerythritol
• ethylenediamine Diamines such as hexamethylenediamine and piperazine
• the coating layer of the present invention is preferably provided by an in-line coating method described later using an aqueous coating solution. Therefore, it is desirable that the urethane resin of the present invention is water-soluble.
• a water-soluble urethane resin is used, compatibility with a resin having an oxazoline group increases, and transparency can be improved.
• the “water-soluble” means that it dissolves in water or an aqueous solution containing less than 50% by mass of a water-soluble organic solvent.
• a sulfonic acid (salt) group or a carboxylic acid (salt) group can be introduced (copolymerized) into the urethane molecular skeleton. Since the sulfonic acid (salt) group is strongly acidic and it may be difficult to maintain moisture resistance due to its hygroscopic performance, it is preferable to introduce a weakly acidic carboxylic acid (salt) group.
• a polyol compound having a carboxylic acid group such as dimethylolpropionic acid or dimethylolbutanoic acid is introduced as a copolymer component to form a salt.
• the salt forming agent include trialkylamines such as ammonia, trimethylamine, triethylamine, triisopropylamine, tri-n-propylamine, and tri-n-butylamine, N such as N-methylmorpholine and N-ethylmorpholine.
• -N-dialkylalkanolamines such as alkylmorpholines, N-dimethylethanolamine and N-diethylethanolamine. These can be used alone or in combination of two or more.
• the composition molar ratio of the polyol compound having a carboxylic acid (salt) group in the urethane resin is the same as that of the urethane resin.
• the total polyisocyanate component is 100 mol%, it is preferably 3 to 60 mol%, and more preferably 10 to 40 mol%. If the composition molar ratio is less than 3 mol%, water dispersibility may be difficult.
• the said composition molar ratio exceeds 60 mol%, since the residual oxazoline group at the time of coating layer formation reduces, heat-and-moisture resistance may fall.
• a urethane resin into which a carboxylic acid is introduced when used as the urethane resin as described above, it may react with the oxazoline group in the coating solution, and the unreacted oxazoline group may be reduced when the coating layer is formed. Therefore, it is desirable that the coating layer has substantially no carboxylic acid (salt) group. Therefore, in order to impart water solubility to the urethane resin, it is a preferred embodiment of the present invention to introduce a polyoxyalkylene group instead of the carboxylate group.
• a coating layer does not have a carboxyl group substantially. Therefore, an unreacted oxazoline group remains stably, and more excellent heat and humidity resistance can be exhibited.
• Examples of the polyoxyalkylene group introduced into the urethane resin include a polyoxyethylene group, a polyoxypropylene group, and a polytetramethylene glycol chain, and these can be used alone or in combination of two or more. Among these, a polyoxyethylene group can be preferably used.
• polyisocyanate and one-end blocked polyoxyethylene glycol (alkoxyethylene glycol whose one end is blocked with an alkyl group having 1 to 20 carbon atoms) are blocked at one end.
• the polyoxyethylene chain-containing monoisocyanate was obtained by removing the unreacted polyisocyanate if necessary. Then, the obtained polyoxyethylene chain-containing monoisocyanate and diisocyanate can be obtained by an allophanatization reaction.
• the composition molar ratio of the polyoxyethylene groups in the urethane resin is 100 mol% of the total polyisocyanate component of the urethane resin. It is preferably 3 mol% or more, more preferably 10 mol% or more, and further preferably 20 mol% or more. If the composition molar ratio is less than 3 mol%, water dispersibility may be difficult.
• the urethane resin is preferably contained in the coating layer in an amount of 10% by mass to 90% by mass.
• it is more preferably 20% by mass or more and 80% by mass or less.
• a resin other than the urethane resin may be contained in order to improve adhesion.
• an acrylic resin, a polyester resin, etc. are mentioned.
• the carboxylic acid group content is low. More preferably, it does not contain a carboxylic acid group. When there are many carboxylic acid groups, it will react with an oxazoline group, and the oxazoline group which reacts with the carboxylic acid group generated from a urethane resin under high temperature and high humidity will decrease.
• Resin having an oxazoline group In the present invention, it is necessary to contain a resin having an oxazoline group.
• the resin having an oxazoline group include a polymer having an oxazoline group, for example, a polymerizable unsaturated monomer having an oxazoline group, and other polymerizable unsaturated monomers as required, and a conventionally known method (for example, solution polymerization). And a polymer obtained by copolymerization by emulsion polymerization or the like.
• Examples of the polymerizable unsaturated monomer having an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-vinyl Examples thereof include isopropenyl-2-oxazoline, 2-isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-ethyl-2-oxazoline and the like.
• Examples of the other polymerizable unsaturated monomers include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, and cyclohexyl (meth) ) Acrylate, lauryl (meth) acrylate, isobornyl (meth) acrylate and other (meth) acrylic acid alkyl or cycloalkyl esters having 1 to 24 carbon atoms; 2-hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate Hydroxyalkyl esters of 2 to 8 carbon atoms of (meth) acrylic acid; vinyl aromatic compounds such as styrene and vinyltoluene; (meth) acrylamide, dimethylaminopropyl (meth) acrylamide, dimethylaminoethyl (Meth) acrylate
• composition molar ratio of the polymerizable unsaturated monomer having an oxazoline group and the copolymer of the other polymerizable unsaturated monomer is such that the polymerizable unsaturated monomer having an oxazoline group is 30 to 70 mol%. It is preferably 40 to 65 mol%.
• the resin having an oxazoline group used in the present invention includes water dispersibility and water solubility. Water solubility is preferred because it is highly compatible with other water-soluble resins and improves the transparency of the coating layer and the crosslinking reaction efficiency.
• hydrophilic monomers include 2-hydroxyethyl (meth) acrylate, methoxypolyethylene glycol (meth) acrylate, and monomers having a polyethylene glycol chain such as a monoester compound of (meth) acrylic acid and polyethylene glycol, (Meth) acrylic acid 2-aminoethyl and its salts, (meth) acrylamide, N-methylol (meth) acrylamide, N- (2-hydroxyethyl) (meth) acrylamide, (meth) acrylonitrile, sodium styrenesulfonate, etc.
• the monomer which has polyethyleneglycol chains such as (meth) acrylic-acid methoxypolyethylene glycol with high solubility to water, and the monoester compound of (meth) acrylic acid and polyethyleneglycol.
• the molecular weight of the polyethylene glycol chain to be introduced is preferably 200 to 900, and more preferably 300 to 700.
• the resin having an oxazoline group is preferably contained in the coating layer in an amount of 5% by mass to 90% by mass.
• it is more preferably 10% by mass or more and 70% by mass or less.
• the coating layer may contain a crosslinking agent different from the resin having an oxazoline group or a resin having a crosslinking group.
• the crosslinking agent include urea, epoxy, melamine, isocyanate, and silanol.
• a catalyst etc. are used suitably as needed.
• particles may be contained in the coating layer.
• Particles are (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, diatomaceous earth
• Inorganic particles such as soil, 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, di Rirufutareto systems include organic particles of polyester
• the particles preferably have an average particle diameter of 1 to 500 nm.
• the average particle size is not particularly limited, but is preferably 1 to 100 nm from the viewpoint of maintaining the transparency of the film.
• the particles may contain two or more kinds of particles having different average particle diameters.
• said average particle diameter measures the maximum diameter of the 10 or more particle
• the particle content is preferably 0.5% by mass or more and 20% by mass or less.
• the amount is small, sufficient blocking resistance cannot be obtained. Further, scratch resistance is deteriorated.
• the amount is large, not only the transparency of the coating layer is deteriorated but also the coating strength is lowered.
• 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 silicon-based, acetylene glycol-based or fluorine-based surfactant. These surfactants are preferably contained in a range that does not impair the adhesion to the optical functional layer, for example, 0.005 to 0.5% by mass in the coating solution.
• the optically easy-adhesive polyester film of the present invention preferably has a haze value of 2.5% or less, more preferably 2.0% or less, and even more preferably 1.5% or less.
• Such an easily adhesive polyester film for optics can be improved in compatibility with other resins by making the resin having an oxazoline group contained in the coating layer described above water-soluble.
• additives may be contained within a range that does not impair adhesion with the optical functional layer.
• the additive include fluorescent dyes, fluorescent brighteners, plasticizers, ultraviolet absorbers, pigment dispersants, foam suppressors, antifoaming agents, preservatives, and antistatic agents.
• 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 optically laminated polyester film of the present invention is selected from a hard coat layer, a light diffusing layer, a prismatic lens layer, an electromagnetic wave absorbing layer, a near-infrared blocking layer, and a transparent conductive layer on at least one side of the polyester film coating layer. It is obtained by at least one optical functional layer.
• the material used for the optical functional layer is not particularly limited.
• PET film Polyethylene terephthalate
• the PET resin After sufficiently drying the PET resin in a vacuum, it is supplied to an extruder, melted and extruded at about 280 ° C. from a T-die into a rotating cooling roll into a sheet, cooled and solidified by an electrostatic application method, and unstretched PET. Get a sheet.
• the unstretched PET sheet may have a single layer structure or a multilayer structure by a coextrusion method. Moreover, it is preferable not to contain an inert particle substantially in PET resin.
• the obtained unstretched PET sheet is stretched 2.5 to 5.0 times in the longitudinal direction with a roll heated to 80 to 120 ° C. to obtain a uniaxially stretched PET film. Further, the end of the film is gripped with a clip, led to a hot air zone heated to 70 to 140 ° C., and stretched 2.5 to 5.0 times in the width direction. Subsequently, the film is guided to a heat treatment zone of 160 to 240 ° C., and heat treatment is performed for 1 to 60 seconds to complete crystal orientation.
• a coating solution is applied to at least one surface of the PET film to form the coating layer.
• the solid concentration of the resin composition in the coating solution is preferably 2 to 35% by weight, particularly preferably 4 to 15% by weight.
• any known method can be used as a method for applying this coating solution to the PET film.
• 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.
• the coating layer is formed by applying the coating solution to an unstretched or uniaxially stretched PET film, drying it, stretching it at least in a uniaxial direction, and then performing a heat treatment.
• the thickness of the finally obtained coating layer is preferably 20 to 350 nm, and the coating amount after drying is preferably 0.02 to 0.5 g / m 2 .
• the coating amount of the coating layer is less than 0.02 g / m 2 , the effect on adhesiveness is almost lost.
• the coating amount exceeds 0.5 g / m 2 , haze increases.
• the coating layer of the optically easy-adhesive thermoplastic resin film obtained in the present invention is good for a hard coat layer, a light diffusion layer, a prismatic lens layer, an electromagnetic wave absorption layer, a near infrared ray blocking layer, and a transparent conductive layer.
• Adhesive By laminating these optical functional layers, it is possible to provide an optical laminated thermoplastic resin film that can maintain an initial function for a long period of time even in a moisture and heat resistant environment. Also, good adhesive strength can be obtained even for applications other than optical applications.
• adhesion such as photographic photosensitive layer, diazo photosensitive layer, matte layer, magnetic layer, inkjet ink receiving layer, hard coat layer, UV curable resin, thermosetting resin, printing ink and UV ink, dry laminate, extrusion laminate, etc.
• adhesion such as photographic photosensitive layer, diazo photosensitive layer, matte layer, magnetic layer, inkjet ink receiving layer, hard coat layer, UV curable resin, thermosetting resin, printing ink and UV ink, dry laminate, extrusion laminate, etc.
• examples thereof include vacuum deposition, electron beam deposition, sputtering, ion plating, CVD, plasma polymerization and the like of an agent, a metal or an inorganic substance, or an oxide thereof, and an organic barrier layer.
• Total light transmittance of the easily adhesive polyester film for optics The total light transmittance of the obtained easily adhesive polyester film for optics is based on JIS K 7105, and a turbidimeter (Nippon Denshoku, NDH2000) is used. And measured.
• Adhesiveness 100 squares reaching the base film through the photocurable acrylic layer on the photocurable acrylic layer surface of the obtained optically laminated polyester film using a cutter guide with a gap interval of 2 mm Make a cut.
• a cellophane adhesive tape manufactured by Nichiban Co., Ltd., No. 405; 24 mm width
• the cellophane pressure-sensitive adhesive tape was peeled off from the surface of the optically curable acrylic layer of the optically laminated polyester film five times, and then the number of grids peeled off from the surface of the optically laminated polyester film was visually checked.
• Adhesiveness (%) (1 ⁇ number of peeled squares / 100) ⁇ 100 ⁇ : 100% or photocuring acrylic layer material failure ⁇ : 99-90% ⁇ : 89-70% ⁇ : 69 to 0%
• water-soluble polyurethane resins (A-2) to (A-3) having different compositions were obtained.
• Table 1 shows the composition (mol% ratio) and other characteristics of these water-soluble polyurethane resins measured by 1 H-NMR.
• Example 1 Adjustment of coating liquid The following coating agent was mixed and the coating liquid was created. 51.00% by mass of water Isopropanol 30.00% by mass Polyurethane resin (A-1) 12.58% by mass Resin (B) having oxazoline group 4.72 mass% Particles 1.57% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) 0.08% by mass of particles (Silica sol with an average particle size of 450 nm, solid content concentration of 40% by mass) Surfactant 0.05% by mass (Silicon, solid content concentration of 100% by mass)
• PET resin pellets having an intrinsic viscosity of 0.62 dl / g and substantially free of particles are obtained at 135 ° C. under a reduced pressure of 133 Pa. Dry for hours. Thereafter, 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.
• a film sample having a photocurable acrylic layer having a thickness of 20 ⁇ m was peeled from the SUS plate to obtain an optical laminated polyester film.
• Photo-curing acrylic coating liquid 54.00% by mass (Arakawa Chemical Beam Set 505A-6)
• Comparative Example 1 An optically easily adhesive polyester film and an optically laminated polyester film were obtained in the same manner as in Example 1 except that the polyurethane resin was changed to a polyurethane resin (A-5) containing polyester polyol as a constituent component.
• Comparative Example 2 An optically easily adhesive polyester film and an optically laminated polyester film were obtained in the same manner as in Example 1 except that the polyurethane resin was changed to a polyurethane resin (A-6) containing polyether polyol as a constituent component.
• Example 2 An optically easily adhesive polyester film and an optically laminated polyester film were obtained in the same manner as in Example 1 except that the polyurethane resin was changed to a polyurethane resin (A-2) containing polycarbonate polyol as a constituent component.
• Example 3 An optically easy-adhesive polyester film and an optically laminated polyester film were obtained in the same manner as in Example 1 except that the polyurethane resin was changed to a polyurethane resin (A-3) containing polycarbonate polyol as a constituent component.
• Example 4 Optically easy-adhesive polyester film and optical laminate in the same manner as in Example 1 except that the polyurethane resin is changed to a urethane resin (A-4) having polycarbonate polyol as a constituent component and having a polyoxyethylene glycol chain in the side chain. A polyester film was obtained.
• Example 5 Except having changed the coating liquid into the following, it carried out similarly to Example 1, and obtained the easily adhesive polyester film for optics, and the laminated polyester film for optics.
• Polyurethane resin (A-1) 17.07 mass%
• Surfactant 0.05% by mass (Silicon, solid content concentration of 100% by mass)
• Example 6 Except having changed the coating liquid into the following, it carried out similarly to Example 1, and obtained the easily adhesive polyester film for optics, and the laminated polyester film for optics.
• Polyurethane resin (A-1) 5.39% by mass
• Resin (B) having oxazoline group 1.01% by mass Particles 1.57% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) 0.08% by mass of particles (Silica sol with an average particle size of 450 nm, solid content concentration of 40% by mass)
• Surfactant 0.05% by mass (Silicon, solid content concentration of 100% by mass)
• Example 7 Except having changed the coating liquid into the following, it carried out similarly to Example 1, and obtained the easily adhesive polyester film for optics, and the laminated polyester film for optics.
• Polyurethane resin (A-1) 14.38% by mass
• Resin (B) having oxazoline group 3.14% by mass Particles 1.57% by mass (Silica sol with an average particle size of 40 nm, solid content concentration of 40% by mass) 0.08% by mass of particles (Silica sol with an average particle size of 450 nm, solid content concentration of 40% by mass)
• the easily adhesive polyester film for optics of the present invention is excellent in adhesion with an optical functional layer and adhesion under high temperature and high humidity (moisture and heat resistance). Therefore, a hard coat film mainly used for displays and the like is used. It is suitable as a base film for optical functional films such as antireflection films, light diffusion sheets, prismatic lens sheets, near-infrared shielding films, transparent conductive films, and antiglare films.

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