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WO2012020722A1 - Film polyester stratifié et film stratifié optique utilisant celui-ci - Google Patents

Film polyester stratifié et film stratifié optique utilisant celui-ci Download PDF

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Publication number
WO2012020722A1
WO2012020722A1 PCT/JP2011/068026 JP2011068026W WO2012020722A1 WO 2012020722 A1 WO2012020722 A1 WO 2012020722A1 JP 2011068026 W JP2011068026 W JP 2011068026W WO 2012020722 A1 WO2012020722 A1 WO 2012020722A1
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WIPO (PCT)
Prior art keywords
layer
film
laminated
polyester film
resin
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Ceased
Application number
PCT/JP2011/068026
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English (en)
Japanese (ja)
Inventor
大河内基裕
松永篤
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toray Industries Inc
Original Assignee
Toray Industries Inc
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Publication date
Application filed by Toray Industries Inc filed Critical Toray Industries Inc
Priority to CN201180038985.1A priority Critical patent/CN103079825B/zh
Priority to KR1020137001089A priority patent/KR20130133159A/ko
Priority to JP2012502785A priority patent/JP5853949B2/ja
Publication of WO2012020722A1 publication Critical patent/WO2012020722A1/fr
Anticipated expiration legal-status Critical
Ceased legal-status Critical Current

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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
    • 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
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/308—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising acrylic (co)polymers
    • 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
    • B32B7/02—Physical, chemical or physicochemical properties
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L67/00—Compositions of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Compositions of derivatives of such polymers
    • C08L67/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
    • 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
    • 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
    • B32B2307/416—Reflective
    • 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
    • B32B2307/418—Refractive
    • 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
    • B32B2307/748—Releasability
    • 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
    • B32B2309/00—Parameters for the laminating or treatment process; Apparatus details
    • B32B2309/08—Dimensions, e.g. volume
    • B32B2309/10—Dimensions, e.g. volume linear, e.g. length, distance, width
    • B32B2309/105—Thickness
    • 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
    • B32B2405/00—Adhesive articles, e.g. adhesive tapes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical

Definitions

  • the present invention relates to a laminated polyester film having good suppression of interference fringes and adhesion to a hard coat agent comprising an active ray curable resin and the laminated polyester when used as a base material for an optical film for hard coat such as a touch panel.
  • the present invention relates to an optical laminated film using a film.
  • an optical film for hard coat is required to have functions such as surface scratch resistance and antifouling properties
  • a method of providing a hard coat layer on a film substrate such as polyethylene terephthalate has been performed.
  • a film substrate such as polyethylene terephthalate
  • there is a problem in visibility because there is a clear interface with a difference in refractive index between the base film made of polyethylene terephthalate and the primer layer or hard coat layer provided on the surface. That is, when viewed from a certain angle, there are problems such as partial iris-like reflection, which impairs visibility, and poor adhesion.
  • Patent Document 2 studies have been made to increase the refractive index of the resin itself by copolymerizing a monomer containing an aromatic substituent such as a fluorene group with the resin used in the easy adhesion layer.
  • Patent Document 2 the polyester film before crystal orientation is completed is subjected to corona discharge treatment as necessary, and an easy-adhesive coating agent is applied, dried, then stretched and heat treated to complete crystal orientation, so-called in-line coating method.
  • high refractive index resin often has a rigid chemical structure, and a large amount of highly hydrophilic sulfonate group is used to disperse the resin in water.
  • Patent Document 3 studies have been made to increase the refractive index of the easy-adhesion layer by providing an easy-adhesion layer containing high-refractive-index metal oxide fine particles such as titanium oxide particles on the polyester film.
  • the coating method tends to cause problems such as film haze deterioration due to surface scattering by particle protrusions and generation of aggregated particles or voids at the particle / binder interface.
  • JP 2004-107627 A Japanese Patent Laid-Open No. 10-110091 JP 2001-330708 A JP 2005-097571 A
  • An object of the present invention is an optically easy-adhesive film excellent in suppression of interference fringes and excellent adhesion to a hard coat layer when used as a substrate for an optical film for hard coat, in a high-temperature and high-humidity environment.
  • the object is to provide a laminated polyester film having both the adhesiveness and the property that realizes the applicability by the in-line coating method at a high level.
  • a polyester film in which a laminated film (C layer) is laminated on at least one surface of a layer (S layer) made of polyester as a base material layer, at a wavelength of 500 nm to 650 nm on the C layer side A laminated polyester film having a minimum value (Rmin) of spectral reflectance of 4.0% to 6.0% and a change amount ( ⁇ r) of spectral reflectance of 0.0% to 1.0%.
  • the C layer contains a polyester resin (A) having a fluorene skeleton and / or a naphthalene skeleton and an acrylic resin (Q), and the content (a) of the polyester resin (A) in the C layer and the acrylic resin
  • the laminated polyester film according to (2) or (3) wherein the wetting tension of the polyester resin (A) is higher than the wetting tension of the acrylic resin (Q), and the difference is 2 mN / m or more and 6 or less.
  • the polyester resin (A) has at least a fluorene skeleton, and the polyester resin (A) does not have a dicarboxylic acid component (Aa-3) having a sulfonate group, or the polyester resin (A
  • the laminated polyester film according to any one of (2) to (4) which is less than 0.1 mol% based on the amount of the dicarboxylic acid component (Aa) constituting (6)
  • the initial adhesion index of the surface of the C layer, the heat and heat resistance index when left in a constant temperature and humidity environment at a temperature of 80 ° C. and a relative humidity of 90%, and the adhesion index after boiling for 3 hours The laminated polyester film according to any one of (1) to (6), wherein all are 3 or more and 5 or less.
  • a hard coat layer made of an actinic radiation curable resin is laminated on the surface of layer C of the laminated polyester film according to any one of (1) to (7), and 500 nm on the hard coat layer side. To 650 nm, an optical laminated film having an average waviness amplitude of spectral reflectance of 1.0% or less.
  • the laminated polyester film of the present invention relates to a laminated polyester film for a hard coat, has good processing suitability when laminating a hard coat layer, and is particularly excellent in reducing interference fringes and color unevenness and initial adhesion to the hard coat layer.
  • a laminated polyester film excellent in moisture resistance and heat-and-heat adhesiveness in a high temperature and high humidity environment is particularly excellent.
  • ADVANTAGE OF THE INVENTION According to this invention, it is possible to provide the optical film excellent in the surface external appearance and abrasion resistance, and it becomes possible to aim at performance enhancement of optical films, such as a touchscreen.
  • FIG. 2 is an enlarged view of a metering wire bar portion of FIG. 1. It is the schematic of the coating device by the metaling wire bar which concerns on one embodiment of the lamination
  • FIG. 4 is an enlarged view of a metering wire bar portion of FIG. 3.
  • 6 is a wavelength / wave reflectance graph showing the waviness amplitude of reflectance of a hard coat film.
  • the laminated polyester film of the present invention has a laminated film (C layer) on at least one surface of a layer (S layer) made of polyester as a base material layer, and has a spectral reflectance of 500 nm to 650 nm on the C layer side.
  • the minimum value (Rmin) is preferably 4.0% or more and 6.0% or less, more preferably 4.5% or more and 5.7% or less, and 4.7% or more and 5.5% or less. It is particularly preferred.
  • the change amount ( ⁇ r) of the spectral reflectance is preferably 1.0% or less, more preferably 0.7% or less, and still more preferably 0.4% or less.
  • the optical properties of the C layer in the present invention are preferably such that the refractive index difference between the polyester film as the base material and the hard coat layer laminated thereon is small, and in order to suppress interference fringes
  • the reflectance needs to be in the above range.
  • the spectral reflectance is out of the above range, the interference fringes when the optical laminated film is formed deteriorate.
  • the method for achieving such a range is not particularly limited, but the refractive index of the C layer is continuously improved from the surface layer to the base material layer so that the refractive index is close to that of the base material layer and the hard coat layer. This is achieved by using the method.
  • the C layer contains a polyester resin (A) and an acrylic resin (Q) having a fluorene skeleton and / or a naphthalene skeleton.
  • the weight ratio (a) / (b) of the content (a) of the polyester resin (A) and the content (b) of the acrylic resin (Q) in the C layer is 40/60 or more and 95/5 or less. More preferably, it is more preferably 50/50 or more and 90/10 or less, and particularly preferably 60/40 or more and 80/20 or less.
  • the wetting tension of the polyester resin (A) is higher than the wetting tension of the acrylic resin (Q), and the difference is preferably 2 to 10 mN / m or less, more preferably 3 to 8 mN / m, and more preferably 4 to Particularly preferred is 6 mN / m.
  • the coating layer provided by applying a coating material consisting of polyester resin (A) and acrylic resin (Q) having a large difference in wetting tension on the base polyester film, due to the layer separation phenomenon due to the wetting tension difference of each resin
  • the resin with low wetting tension on the surface side and the resin with high wetting tension on the substrate side mutually exclude each other, so that both layers are selectively arranged in two layers, and a clear interface is formed to completely form two layers There is a problem that becomes a structure.
  • an incomplete layer separation phenomenon occurs, such as when the difference in wetting tension is small, there is a problem that the layers are not separated at all.
  • the laminated polyester film for optics of the present invention has a polyester resin (A) and an acrylic resin (Q), which are constituent components of the coating layer, within the above-mentioned range, so that the polyester resin ( A)
  • the layer separation between the acrylic resin (Q) and the acrylic resin (Q) is appropriately advanced, and the composition ratio of the polyester resin (A) and the acrylic resin (Q) is continuously changed from the base material layer side to the hard coat layer side.
  • a fluorene skeleton and / or naphthalene skeleton to the polyester resin (A), it becomes possible to increase the refractive index to the same degree as the base polyester layer of the polyester resin (A), and the refractive index in the thickness direction in the C layer. Can be continuously changed.
  • the polyester resin (A) has a fluorene skeleton and / or a naphthalene skeleton, which is a conventional problem, the stretchable followability is lowered, the acrylic resin component can be formed by the configuration as described above. It is considered to play a role as a stretching aid, and is preferable because stretchability is greatly improved and coating uniformity is improved.
  • the polyester resin (A) needs to be higher than the wetting tension of the acrylic resin (Q), and is an aqueous dispersion having a polyester skeleton having a hydrophilic group such as a carboxylic acid group or a sulfonic acid group.
  • the hydrophilic group having a wetting tension difference with the acrylic resin (Q) within the above range a carboxylic acid group is preferable, and when there are too many sulfonic acid groups, the surface tension difference with the acrylic resin (Q) is within the above range. May deviate.
  • the acrylic resin (Q) it is necessary that it is lower than the wetting tension of the polyester resin (A), and when used as an aqueous coating agent, it is an aqueous dispersion of acrylic particles, that is, an emulsion. preferable.
  • the layer C formed by applying the resin composition is expected to continuously improve the composition ratio of the acrylic resin (Q) from the base material layer to the hard coat layer.
  • the acrylic resin (Q) is selectively present on the side, it is preferably equal to or close to the wetting tension of the acrylic resin (Q).
  • the preferable wetting tension of the polyester resin (A) and the acrylic resin (Q) is 30 mN / m or more and 50 mN / m or less, and the wetting tension of any resin is 40 mN / m or less. It is preferable from the viewpoints of the moisture and heat resistant adhesion index and the adhesion index after boiling.
  • the polyester resin (A) to be described later does not have a dicarboxylic acid component (Aa-3) having a sulfonate group, or is equal to or less than the amount of the dicarboxylic acid component (Aa) constituting the polyester resin (A). It can be easily achieved by having less than 1 mol%.
  • the layer thickness of the C layer is preferably in the range of 50 to 300 nm, more preferably in the range of 70 to 170 nm, in order to suppress interference fringes with the hard coat layer.
  • the C layer hardly forms the structure as described above, and the effect of suppressing the reflected light at the interface hardly occurs, and interference fringes are easily generated when the hard coat layer is provided. .
  • the laminated polyester film of the present invention can be made into a hard coat film by laminating a hard coat layer on the surface of the C layer.
  • the initial adhesion index between the C layer surface and the hard coat layer a temperature of 80 ° C., a relative humidity. It is preferable that the moisture and heat resistant adhesion index when left in a 90% constant temperature and humidity environment for 250 hours is 3 or more and 5 or less. Furthermore, it is more preferable that the adhesion index after boiling in 3 hours, which is a technique for evaluating more severe wet heat resistance, is 3 or more and 5 or less.
  • the upper limit of the initial adhesion index, the heat-and-moisture resistant adhesion index, and the adhesion index after boiling is an evaluation index that does not peel at all.
  • Adhesiveness of the laminated polyester film of the present invention and the hard coat layer in a wet heat environment is strongly demanded particularly for a hard coat film used for a portable device.
  • condensation in a bathroom, a hot and humid area, a cold region, etc. Is required to have moisture and heat resistance.
  • a heat-and-moisture resistance test for 250 hours to 500 hours has been carried out, but in order to shorten the inspection time and to obtain the ultimate heat-and-moisture resistance, a boiling test has recently been imposed.
  • the initial adhesion index is less than 3, it is not preferable because the moisture and heat resistant adhesion index and the adhesion index after boiling tend to be 3 or more.
  • the moisture and heat resistance index is 3 or more, it is possible to suppress a decrease in adhesion between the laminated polyester film and the hard coat layer even in a high temperature and high humidity environment, and it is preferably used in applications where moisture and heat resistance is required. be able to.
  • the adhesion index after boiling for 3 hours is 3 or more, the adhesiveness is maintained even in a severer high temperature and high humidity environment, so that it can be used in a very severe environment and is particularly preferable.
  • the initial adhesion index is an index indicating the initial adhesion of the surface of the C layer with the hard coat layer. After the hard coat layer is laminated on the laminated polyester film of the present invention, the environmental load at high temperature and / or high humidity is reduced.
  • the moisture and heat resistant adhesion index when left in a constant temperature and humidity environment at a temperature of 80 ° C. and a relative humidity of 90% for 250 hours is an index indicating the moisture and heat resistance of the C layer surface to the hard coat layer.
  • the index is obtained by laminating a hard coat layer on a laminated polyester film and then measuring the adhesiveness between the laminated polyester film of the present invention and the hard coat layer by applying an environmental load of constant temperature and humidity at the high temperature and high humidity described above.
  • the adhesion index after boiling after 3 hours is an index indicating the adhesiveness after boiling on the surface of the C layer with the hard coat layer.
  • the hard coat layer is laminated on the laminated polyester film of the present invention, and 3% in boiling water. It is an index obtained by measuring the adhesion between the laminated polyester film of the present invention and the hard coat layer by applying an environmental load after immersion for a period of time.
  • the C layer contains a polyester resin (A) having a fluorene skeleton and / or a naphthalene skeleton and an acrylic resin (Q), and a polyester resin ( A) does not have a dicarboxylic acid component (Aa-3) having a sulfonate group, or has less than 0.1 mol% with respect to the amount of the dicarboxylic acid component (Aa) constituting the polyester resin (A), etc. Is mentioned. Further, by adding a cross-linking agent to the C layer, it is possible to further improve the moist heat resistance index and the boiling index after boiling (details will be described later).
  • the laminated polyester film of the present invention needs to have a C layer having the above reflectance characteristics on a hard coat processed surface of a layer (S layer) to be a base material layer.
  • a layer S layer
  • the light reflection at the interface between the hard coat layer and the laminated polyester film is suppressed, so that the rainbow color due to interference
  • An optical laminated film with a reduced pattern can be obtained.
  • a layer in which the polyester resin (A) and the acrylic resin (Q) are mixed is formed, and the polyester resin (A) This can be achieved by improving the refractive index to the same level as the base material layer.
  • a polyester resin (A) is achieved by having a fluorene skeleton and / or a naphthalene skeleton, and realizes a coating property by an in-line coating method at a high level and has a refractive index of the polyester resin (A) as a base material. In order to make it closer to the layer, it preferably has a fluorene skeleton.
  • the polyester resin (A) having a fluorene skeleton can be obtained by adjusting the copolymerization amount of the dicarboxylic acid component (Aa-1) having a fluorene skeleton and the glycol component (Ab-1) having a fluorene skeleton.
  • the polyester resin (A) having a fluorene skeleton refers to a polyester resin having an ester bond in the main chain or side chain, and can be obtained by the following method I) or II).
  • a method in which I) and II) are used together a method in which a dicarboxylic acid component (Aa), a glycol component (Ab), and a component (Ac) are used as constituent components and these are subjected to a polycondensation reaction
  • a dicarboxylic acid component (Aa) and a glycol component (Ab) are used as constituent components and both are subjected to a polycondensation reaction
  • a component (Ac) having at least one alcoholic functional group (hydroxyl group) and at least one carboxyl group is used as a component and subjected to a polycondensation reaction.
  • the dicarboxylic acid component (Aa) is classified into a dicarboxylic acid component (Aa-1) having a fluorene skeleton and a dicarboxylic acid component (Aa-2) having no fluorene skeleton.
  • the glycol component (Ab) is classified into a glycol component (Ab-1) having a fluorene skeleton and a glycol component (Ab-2) having no fluorene skeleton.
  • a dicarboxylic acid component (Aa-1) having a fluorene skeleton and / or a glycol component (Ab-1) having a fluorene skeleton are copolymerized. It is preferable.
  • the component (Ac) is classified into a component (Ac-1) having a fluorene skeleton and a component (Ac-2) having no fluorene skeleton.
  • the component (Ac-1) having a fluorene skeleton is preferably copolymerized in order to introduce the fluorene skeleton into the polyester resin (A).
  • the dicarboxylic acid component (Aa) includes an ester-forming derivative obtained by alkylating a dicarboxylic acid.
  • the dicarboxylic acid component (Aa) includes not only dicarboxylic acids in a narrow sense but also polyvalent carboxylic acids having 3 or more valences.
  • the dicarboxylic acid component (Aa) includes an acid anhydride.
  • the glycol component (Aa) includes not only a narrowly-defined glycol but also a trivalent or higher polyol.
  • Examples of the dicarboxylic acid component (Aa-1) having a fluorene skeleton include 9,9-bis (t-butoxycarbonylmethyl) fluorene, 9,9-bis [2- (t-butoxycarbonyl) ethyl] fluorene, 9 , 9-bis [1- (t-butoxycarbonyl) ethyl] fluorene, 9,9-bis [2- (t-butoxycarbonyl) -1-cyclohexylethyl] fluorene, 9,9-bis [2- (t- Butoxycarbonyl) -1-phenylethyl] fluorene, 9,9-bis [1- (t-butoxycarbonyl) propyl] fluorene, 9,9-bis [2- (t-butoxycarbonyl) propyl] fluorene, 9,9 -Bis [2- (t-butoxycarbonyl) -1-methylethyl] fluorene, 9,9-bis [2- (t-butoxy
  • dicarboxylic acid component (Aa-2) having no fluorene skeleton aromatic, aliphatic and alicyclic dicarboxylic acids having no fluorene skeleton and polyvalent carboxylic acids having 3 or more valences can be used.
  • dicarboxylic acid component (Aa-2) terephthalic acid, isophthalic acid, orthophthalic acid, phthalic acid, 2,5-dimethylterephthalic acid, 1,4-naphthalenedicarboxylic acid, biphenyldicarboxylic acid, 2,6 -Naphthalenedicarboxylic acid, 1,2-bisphenoxyethane-p, p'-dicarboxylic acid, phenylindanedicarboxylic acid and the like can be used.
  • aliphatic and alicyclic dicarboxylic acids examples include succinic acid, adipic acid, sebacic acid, dodecanedioic acid, dimer acid, 1,3-cyclopentanedicarboxylic acid, 1,2-cyclohexanedicarboxylic acid, 1, 4-Cyclohexanedicarboxylic acid and the like, and ester-forming derivatives thereof can be used.
  • glycol component (Ab-1) having a fluorene skeleton 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3-methylphenyl Fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3,5-dimethylphenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3-ethylphenyl] fluorene, 9 , 9-bis [4- (2-hydroxyethoxy) -3,5-diethylphenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3-propylphenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3,5-dipropylphenyl] fluorene, 9,9-bis [4- (2-hydroxyethoxy) -3-iso Lopyrphenyl] fluoren
  • glycol component (Ab-2) having no fluorene skeleton examples include ethylene glycol, diethylene glycol, polyethylene glycol, propylene glycol, polypropylene glycol, 1,3-propanediol, 1,3-butanediol, 1,4-butanediol, , 5-pentanediol, 1,6-hexanediol, 1,7-heptanediol, 1,8-octanediol, 1,9-nonanediol, 1,10-decanediol, 2,4-dimethyl-2-ethyl Hexane-1,3-diol, neopentyl glycol, 2-ethyl-2-butyl-1,3-propanediol, 2-ethyl-2-isobutyl-1,3-propanediol, 3-methyl-1,5- Pentanediol, 2,2,4-trimethyl
  • the copolymerization amount of the dicarboxylic acid component (Aa-1) having a fluorene skeleton in the polyester resin (A) having a fluorene skeleton is 40 mol% with respect to the amount of the dicarboxylic acid component (Aa) constituting the polyester resin (A). It is preferable that it is above, and more preferably 80 mol% or more. Although an upper limit is not specifically limited, It is preferable that it is 95 mol% or less.
  • the copolymerization amount of the glycol component (Ab-1) having a fluorene skeleton in the polyester resin (A) having a fluorene skeleton is based on the amount of the glycol component (Ab) constituting the fluorene copolymerized polyester resin (A). It is preferable that it is 40 mol% or more, More preferably, it is 80 mol% or more. The upper limit is not particularly limited, but is particularly preferably 95 mol% or less.
  • the polyester resin (A) When the copolymerization amount is less than 40 mol%, the polyester resin (A) is not sufficiently increased in refractive index, and interference fringes may occur when the hard coat layer is laminated.
  • the upper limit is not particularly limited, but if the copolymerization ratio exceeds 95 mol%, the glass transition temperature of the polyester resin (A) becomes high, the stretchability becomes poor, the handling property is deteriorated, When the C layer is provided by using an in-line coating method to be described later, the stretchable followability becomes poor and a uniform C layer may not be provided.
  • the amount of copolymerization of the dicarboxylic acid component (Aa-1) having a fluorene skeleton and the glycol component (Ab-1) having a fluorene skeleton in the polyester resin (A) having a fluorene skeleton is such that the fluorene copolymer polyester resin (A)
  • the total of the substance amount of the dicarboxylic acid component (Aa) and the glycol component (Ab) constituting 100 is 100 mol%, it is preferably 20 mol% or more, more preferably 40 mol% or more. Although an upper limit is not specifically limited, It is preferable that it is 50 mol% or less.
  • the dicarboxylic acid component and / or diol component having the fluorene skeleton has, for example, the naphthalene skeleton exemplified above. It can be obtained by the method.
  • the optical laminated film of the present invention can be produced by laminating the C layer by applying a water-based coating agent containing the polyester resin (A) to the surface of the S layer, followed by drying and heat treatment.
  • the polyester resin (A) is preferably water-soluble.
  • a hydrophilic component such as a compound containing a carboxylate group or a compound containing a sulfonate group into the side chain of the polyester resin (A).
  • the introduction of the hydrophilic component is achieved by using a dicarboxylic acid component (Aa-3) having a sulfonate group or a trivalent or higher polyvalent carboxylic acid component (Aa-4) as the dicarboxylic acid component (Aa). can do.
  • dicarboxylic acid component (Aa-3) having a sulfonate group examples include sulfoisophthalic acid, 5-sulfoisophthalic acid, 4-sulfophthalic acid, 4-sulfonaphthalene-2,7 dicarboxylic 5 [4-sulfophenoxy] isophthalic acid. Alkali metal salts, alkaline earth metal salts, and the like.
  • an acid anhydride may be used in addition to the polyvalent carboxylic acid such as trimellitic acid.
  • 1,2,4,5-butanetetracarboxylic dianhydride pyromellitic anhydride
  • 1,2,3,4-pentanetetracarboxylic dianhydride 3,3 ′, 4, 4′-benzophenone tetracarboxylic dianhydride
  • cyclopentanetetracarboxylic dianhydride 2,3,6,7-naphthalenetetracarboxylic dianhydride
  • 1,2,5, 6-naphthalenetetracarboxylic dianhydride 1,2,5, 6-naphthalenetetracar
  • the polyester resin (A) does not have a dicarboxylic acid component (Aa-3) having a sulfonate group, or the amount of the dicarboxylic acid component (Aa) constituting the polyester resin (A). It is preferable to have less than 0.1 mol%.
  • the amount of the dicarboxylic acid component (Aa-3) having a sulfonate group is more preferably 0.05 mol% or less, and particularly preferably not (0 mol%).
  • the polyester resin (A) when imparting hydrophilicity (water solubility) to the polyester resin (A), it is preferable to copolymerize a trivalent or higher polyvalent carboxylic acid component (Aa-4).
  • a carboxyl group By copolymerizing the trivalent or higher polyvalent carboxylic acid component (Aa-4), a carboxyl group can be introduced into the side chain of the polyester resin (A).
  • it is good also as a carboxylate group by neutralizing this carboxyl group with ammonia, sodium hydroxide, etc.
  • the hydrophilicity can be further enhanced.
  • a trivalent or higher polyvalent carboxylic acid anhydride (Aa-) is added to the polyester polyol (polyester oligomer) obtained by reacting the dicarboxylic acid component (Aa) and the glycol component (Ab). It is preferable to use a method of introducing a carboxyl group into the side chain of the polyester resin (A) by reacting 4). By using this method, a carboxyl group can be more efficiently introduced into the side chain of the polyester resin (A).
  • the substance amount (Aa-4m (mol)) of the polyvalent carboxylic acid anhydride (Aa-4) used at this time is equal to the substance amount (Aam (mol)) of the glycol component (Aa) used in the esterification reaction. It is preferable to set the substance amount to 0.5 to 1.0 times the difference (Aam ⁇ Abm (mol)) in the substance amount (Abm (mol)) of the dicarboxylic acid component. If it is less than 0.5 times, the adhesiveness of the prepared polyester resin coating film to the base material may be deteriorated in a high temperature and high humidity environment, and if it exceeds 1.0 times, the number average molecular weight of the polyester may not be increased. Yes, not preferred.
  • a trace amount of a water-soluble organic solvent may be contained from the viewpoint of improving the storage stability and handling properties of the coating material.
  • water-soluble organic solvents include water-soluble alcohols such as methyl alcohol, ethyl alcohol, and isopropyl alcohol, water-soluble ketones such as acetone, and water-soluble ethers such as methyl cellosolve, ethyl cellosolve, butyl cellosolve, carbitol, and butyl carbitol. Can be mentioned. These can be used alone or in combination.
  • the content is preferably 10% or less, preferably 7% or less, more preferably 5% or less, based on the total amount of the coating material, from the viewpoint of explosion-proof properties and environmental pollution.
  • the addition amount of 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene and ethylene glycol is 1.01 to 2.0 times mol with respect to all dicarboxylic acid components.
  • the dicarboxylic acid component since an excess glycol component is required with respect to the dicarboxylic acid component, 1.01 times mol or more of the glycol component is required with respect to the dicarboxylic acid component.
  • it exceeds 2.0 moles the number average molecular weight distribution of the polyester resin (A) may not increase, which is not preferable.
  • the catalyst examples include titanium-based catalysts such as tetraisopropyl titanate and tetra-n-butyl titanate, antimony-based compounds such as antimony trioxide, germanium-based catalysts such as germanium oxide, and catalysts such as zinc acetate, manganese acetate, and dibutyltin oxide.
  • titanium-based catalysts such as tetraisopropyl titanate and tetra-n-butyl titanate
  • antimony-based compounds such as antimony trioxide
  • germanium-based catalysts such as germanium oxide
  • catalysts such as zinc acetate, manganese acetate, and dibutyltin oxide.
  • tetra-n-butyl titanate is used.
  • the addition amount of the catalyst is preferably 10 to 1000 ppm with respect to the dicarboxylic acid component, and if it is less than 10 ppm, the reaction may not proceed. On the other hand, if it exceeds 1000 ppm, there
  • the esterification reaction at this time is not particularly limited by temperature and time, and may be carried out within a known range. For example, it is usually carried out at 160 to 240 ° C. for about 1 to 10 hours while distilling water or alcohol. Thereafter, the reaction system is gradually decompressed at about 200 to 260 ° C., and the reaction is carried out at 0.01 to 0.5 MPa for about 0.1 to 3 hours.
  • polycarboxylic acid anhydride (Aa-4) is added to the obtained polyester polyol. If this reaction is carried out at 160 to 200 ° C. for about 1 to 10 hours, the desired polyester polyol can be obtained. It is done. At this time, the catalyst may be added to the same extent.
  • the intrinsic viscosity of the polyester resin (A) is not particularly limited, but it is preferably 0.3 dl / g or more from the viewpoint that the adhesion to an adherend such as a hard coat layer is good. More preferably, it is 0.35 dl / g or more, Most preferably, it is 0.4 dl / g or more.
  • the upper limit of the intrinsic viscosity is not particularly limited, but is preferably 0.8 dl / g or less from the viewpoint of handling properties.
  • the polyester resin (A) having the intended intrinsic viscosity can be obtained by adjusting melt polymerization conditions such as polymerization time and polymerization temperature.
  • the glass transition point (hereinafter sometimes abbreviated as Tg) of the polyester resin (A) is preferably 50 to 170 ° C., more preferably 50 to 150 ° C. If the Tg is less than 50 ° C., the heat-and-moisture resistance is likely to deteriorate, whereas if it exceeds 150 ° C., the C layer may not be uniformly applied in the in-line coating method described later.
  • Tg glass transition point of the polyester resin (A) is preferably 50 to 170 ° C., more preferably 50 to 150 ° C. If the Tg is less than 50 ° C., the heat-and-moisture resistance is likely to deteriorate, whereas if it exceeds 150 ° C., the C layer may not be uniformly applied in the in-line coating method described later.
  • the acid value of the polyester resin (A) is preferably 20 mgKOH / g or more, more preferably 30 mgKOH / g or more.
  • the acid value of the polyester resin (A) is preferably 20 mgKOH / g or more, more preferably 30 mgKOH / g or more.
  • the acrylic resin (Q) is a monomer component constituting the acrylic resin, for example, alkyl acrylate, alkyl methacrylate (the alkyl group is methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, etc.) T-butyl group, 2-ethylhexyl group, lauryl group, stearyl group, cyclohexyl group, phenyl group, benzyl group, phenylethyl group, etc.), 2-hydroxyethyl acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl acrylate, Hydroxy group-containing monomers such as 2-hydroxypropyl methacrylate, acrylamide, methacrylamide, N-methylacrylamide, N-methylmethacrylamide, N-methylolacrylamide, N-methylolmethacrylamide Amide group-containing monomers such as N, N-dimethylolacrylamide, N-
  • Amino group-containing monomers glycidyl acrylate, epoxy group-containing monomers such as glycidyl methacrylate, monomers such as acrylic acid, methacrylic acid and salts thereof (lithium salt, sodium salt, potassium salt, etc.) or monomers containing such salts These may be (co) polymerized using one or more of them. Furthermore, other types of monomers other than those described above can be used in combination.
  • epoxy group containing monomers such as allyl glycidyl ether, styrene sulfonic acid, vinyl sulfonic acid, and their salts (lithium salt, sodium salt, potassium salt, ammonium salt)
  • monomers containing sulfonic acid groups or salts thereof such as crotonic acid, itaconic acid, maleic acid, fumaric acid and their salts (lithium salts, sodium salts, potassium salts, ammonium salts, etc.) or the like
  • Monomers containing salts monomers containing acid anhydrides such as maleic anhydride and itaconic anhydride, vinyl isocyanate, allyl isocyanate, styrene, vinyl methyl ether, vinyl ethyl ether, vinyl trisalkoxysilane, alkyl malein Monoesters, alkyl fumaric acid monoester, acrylonitrile, me
  • a modified acrylic copolymer for example, a block copolymer modified with polyester, urethane, epoxy or the like, a graft copolymer and the like can be included.
  • the glass transition point (Tg) of the acrylic resin (Q) used for the laminated film is not particularly limited, but is preferably 0 to 90 ° C., more preferably 10 to 80 ° C.
  • the acrylic resin (Q) having a low Tg is used, the heat-resistant adhesion tends to be inferior, and conversely, when it is too high, the film forming property may be inferior.
  • the molecular weight of the acrylic resin (Q) is preferably 100,000 or more, more preferably 300,000 or more from the viewpoint of adhesiveness.
  • More preferable acrylic resin (Q) used for the C layer is selected from methyl methacrylate, ethyl acrylate, n-butyl acrylate, 2-hydroxyethyl acrylate, acrylamide, N-methylol acrylamide, glycidyl methacrylate, and acrylic acid (co-polymer). ) Polymers can be mentioned. It is preferable to use an aqueous acrylic resin (Q) obtained by dissolving, emulsifying, or suspending the acrylic resin (Q) in water as a raw material for the C layer from the viewpoint of preventing environmental pollution and explosion-proof during application.
  • Such an aqueous acrylic resin (Q) is a copolymer of a monomer having a hydrophilic group (such as acrylic acid, methacrylic acid, acrylamide, vinyl sulfonic acid and its salt) and the above-mentioned monomers, a reactive emulsifier or a surfactant.
  • the mode of the acrylic resin (Q) used for the laminated film is not particularly limited, but is preferably an aqueous dispersion having a particle size of 100 nm, that is, an emulsion, and further an aqueous dispersion having a particle size of 60 nm or less.
  • the acrylic resin (Q) is completely dissolved in water, the layer separation action with the polyester resin (A) is reduced, and an emulsion having a particle size larger than 100 nm increases the haze of the film and is not suitable as an optical laminated film. Appropriate.
  • the C layer contains a crosslinking agent (B) in addition to the polyester resin (A) and the acrylic resin (Q) from the viewpoint of improving the heat and heat resistance.
  • a crosslinking agent (B) in addition to the polyester resin (A) and the acrylic resin (Q) from the viewpoint of improving the heat and heat resistance.
  • the total of the polyester resin (A) and acrylic resin (Q) and the cross-linking agent (B) should be adjusted to 90% by weight or more with respect to the entire C layer. Is preferred.
  • the upper limit of total content is not specifically limited, 100 weight% becomes a substantial upper limit.
  • the crosslinking agent (B) by using one or more crosslinking agents selected from the group consisting of melamine crosslinking agents, oxazoline crosslinking agents, and carbodiimide crosslinking agents, a fluorene copolymer polyester resin ( It is preferable because improvement in wet heat resistance due to deactivation of the carboxyl groups of A) and acrylic resin (Q) and improvement in wet heat resistance due to the progress of the self-crosslinking reaction of the crosslinking agent (B) are observed.
  • content in the C layer of crosslinking agents (B), such as a melamine type, an oxazoline type, a carbodiimide type is not specifically limited, You may use 2 or more types of crosslinking agents.
  • the adhesion index after boiling is remarkably improved, which is particularly preferable.
  • the crosslinkable reactive groups of the polyester resin (A) and acrylic resin (C) and the above three types of crosslinkers have no partial bias, and the entire C layer is sufficient. It is considered that the moisture and heat resistant adhesiveness is improved by the crosslinking reaction.
  • the melamine-based crosslinking agent used in the present invention is not particularly limited, but is partially or completely etherified by reacting melamine, a methylolated melamine derivative obtained by condensing melamine and formaldehyde, or a methylolated melamine with a lower alcohol.
  • a compound, a mixture thereof, and the like can be used.
  • the melamine-based crosslinking agent may be a monomer, a condensate composed of a dimer or higher polymer, or a mixture thereof.
  • As the lower alcohol used for etherification methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butanol, isobutanol and the like can be used.
  • the functional group has an imino group, a methylol group, or an alkoxymethyl group such as a methoxymethyl group or a butoxymethyl group in one molecule, and an imino group type methylated melamine resin, a methylol group type melamine resin, or a methylol group type.
  • imino group type methylated melamine resin examples include methylated melamine resins and fully alkyl type methylated melamine resins. Of these, methylolated melamine resins are most preferred.
  • an acidic catalyst such as p-toluenesulfonic acid may be used to accelerate the thermal curing of the melamine-based crosslinking agent.
  • the oxazoline-based crosslinking agent used in the present invention is not particularly limited as long as it has an oxazoline group as a functional group in the compound, but includes at least one monomer containing an oxazoline group, And what consists of an oxazoline group containing copolymer obtained by copolymerizing at least 1 type of another monomer is preferable.
  • Examples of the monomer containing an oxazoline group include 2-vinyl-2-oxazoline, 2-vinyl-4-methyl-2-oxazoline, 2-vinyl-5-methyl-2-oxazoline, 2-isopropenyl-2-oxazoline, 2-Isopropenyl-4-methyl-2-oxazoline, 2-isopropenyl-5-ethyl-2-oxazoline, and the like can be used, and one or a mixture of two or more thereof can also be used. Of these, 2-isopropenyl-2-oxazoline is preferred because it is easily available industrially.
  • the at least one other monomer used for the monomer containing the oxazoline group is not particularly limited as long as it is a monomer copolymerizable with the monomer containing the oxazoline group.
  • Acrylates or methacrylates such as methyl acrylate, methyl methacrylate, ethyl acrylate, ethyl methacrylate, butyl acrylate, butyl methacrylate, 2-ethylhexyl acrylate, 2-ethylhexyl methacrylate, etc.
  • Acids unsaturated carboxylic acids such as methacrylic acid, itaconic acid and maleic acid, unsaturated nitriles such as acrylonitrile and methacrylonitrile, acrylamide, methacrylamide, N-methylolacrylamide, N-methylolmethacrylate
  • unsaturated amides such as amides, vinyl esters such as vinyl acetate and vinyl propionate, vinyl ethers such as methyl vinyl ether and ethyl vinyl ether, olefins such as ethylene and propylene, vinyl chloride, vinylidene chloride and vinyl fluoride.
  • Halogen- ⁇ , ⁇ -unsaturated monomers, ⁇ , ⁇ -unsaturated aromatic monomers such as styrene, ⁇ -methylstyrene, etc. can be used, and these should be used alone or in a mixture of two or more. You can also.
  • the carbodiimide-based crosslinking agent used in the present invention is particularly a compound having one or two or more cyanamide groups in the molecule having a carbodiimide group or a tautomeric relationship as a functional group in the compound. It is not limited. Specific examples of such carbodiimide compounds include dicyclohexylmethane carbodiimide, dicyclohexyl carbodiimide, tetramethylxylylene carbodiimide, urea-modified carbodiimide, and the like, and these may be used alone or as a mixture of two or more. .
  • the resin constituting the C layer and the crosslinking agent in the present invention can be mixed and used at an arbitrary ratio, but the content (c) of the crosslinking agent (B) is 100% by weight of the entire C layer.
  • the addition of 5 wt% or more and 50 wt% or less is preferable from the viewpoint of improving the adhesion under normal conditions, more preferably 10 to 40 wt%, and particularly preferably 15 to 35 wt%.
  • the addition amount of the cross-linking agent is less than 5% by weight, the effect of addition is small, and the heat-and-moisture resistance to the hard coat layer is lowered, resulting in poor practicality.
  • the refractive index of the entire C layer is lowered, so that interference fringes when used as a base material for an optical hard coat film are deteriorated.
  • the heat-and-moisture resistance is remarkably improved. In some cases, it is necessary to adjust the refractive index on the resin side.
  • fine particles in the C layer are not particularly limited, but inorganic particles such as colloidal silica, titanium oxide, aluminum oxide, zirconium oxide, calcium carbonate, carbon black, zeolite particles, acrylic particles, silicone particles, polyimide particles, “Teflon (registered trademark) ) "Organic particles such as particles, cross-linked polyester particles, cross-linked polystyrene particles, cross-linked polymer particles, and core-shell particles may be used. Any of these particles may be used or a plurality of types may be used in combination.
  • inorganic particles such as colloidal silica, titanium oxide, aluminum oxide, zirconium oxide, calcium carbonate, carbon black, zeolite particles, acrylic particles, silicone particles, polyimide particles, “Teflon (registered trademark) ) "Organic particles such as particles, cross-linked polyester particles, cross-linked polystyrene particles, cross-linked polymer particles, and core-shell particles may be used. Any of these particles may be used or a plurality
  • the number average primary particle diameter of these particles is preferably in the range of 0.01 to 0.6 ⁇ m.
  • the average primary particle diameter is an average of the particle diameters of primary particles defined as particles generated by the growth of a single crystal nucleus in JIS-H7008 (2002).
  • the particle diameter of the primary particles (hereinafter referred to as the primary particle diameter) is the average value of the major axis and the minor axis.
  • SEM scanning electron microscope
  • the average primary particle diameter can be determined from the number average value obtained by measuring the primary diameter by measuring the average diameter and determining the primary particle diameter by average. If the average primary particle size of the particles is less than 0.01 ⁇ m, the particles may aggregate and deteriorate the haze of the C layer. Conversely, if it exceeds 0.6 ⁇ m, The effect of blocking resistance is difficult to obtain, and depending on the thickness of the C layer, particles may fall off.
  • the average primary particle size of the particles is more preferably in the range of 20 to 500 nm, still more preferably in the range of 20 to 400 nm.
  • the particles may be monodispersed particles or aggregated particles in which a plurality of particles are aggregated.
  • a plurality of types of particles having different average primary particle sizes may be used in combination.
  • the addition amount of the particles should be appropriately adjusted and designed according to the thickness of the C layer, the resin composition, the average primary particle size, the required slipperiness and use, etc., but is 0 for 100 parts by weight of the entire C layer. It is preferably in the range of 0.05 to 8 parts by weight, more preferably in the range of 0.1 to 5 parts by weight.
  • various additives for example, an antioxidant, a heat stabilizer, a weather stabilizer, an ultraviolet absorber, an organic lubricant, within a range not inhibiting the effects of the present invention, Pigments, dyes, organic or inorganic fine particles, fillers, antistatic agents, nucleating agents and the like may be blended.
  • examples of the method for obtaining the optical laminated film having the S layer and the C layer include a method of laminating the C layer on the S layer.
  • a method of coating (coating) a coating agent constituting the C layer on the S layer and laminating is preferable.
  • a coating method there is a method in which coating is performed in a process separate from the manufacturing process of the S layer, a so-called offline coating method, and a laminated polyester film in which coating is performed during the manufacturing process of the S layer and the C layer is laminated on the S layer.
  • a so-called offline coating method there is a so-called in-line coating method that obtains at once.
  • the solvent of the coating liquid used in that case should be an aqueous system from the viewpoint of environmental pollution and explosion-proof properties. Most preferred.
  • the application method of the aqueous coating agent is not particularly limited.
  • a reverse coating method for example, a spray coating method, a bar coating method, a gravure coating method, a rod coating method, a die coating method, etc.
  • a gravure coating method and a metalling wire bar coating method are preferable, and a metaling wire bar coating method is particularly preferable.
  • the coating agent When using the metalling wire bar coating method, it is preferable to apply the coating agent uniformly with a bar, but the coating appearance may be deteriorated if the coating liquid scraped off by the bar is poor. It is preferable to install covers as illustrated in FIGS. 1 and 2 upstream and downstream of the metering wire bar in order to smoothly remove the scraped coating liquid and prevent defects due to splashing.
  • the clearance (X) between the metalling wire bar and the upstream cover is 0.7 to 2.0 mm
  • the clearance (Y) between the metalling wire bar and the downstream cover is 0.3 to 0 narrower than (X). It is preferable to set the thickness to 7 mm because it can ensure liquid drainage and prevent defects due to liquid splashing.
  • the gap (X) between the metering wire bar and the upstream cover is less than 0.7 mm, the liquid-removing property will deteriorate, so the thickness unevenness of the C layer may deteriorate. This is not preferable because the coating defects due to the coating increase. Further, when the gap (Y) between the metering wire bar and the downstream cover is less than 0.3 mm, the liquid drainage from the downstream side is deteriorated, and therefore the thickness unevenness of the C layer may be deteriorated. If it exceeds 7 mm, coating defects due to splashing increase, which is not preferable.
  • the coating liquid is directly supplied to the lower part of the metalling wire bar, the lower part of the bar is filled with the coating liquid, and the lower part of the metalling wire bar is filled with the coating liquid.
  • the thickness unevenness of the C layer can use the thickness tolerance of the C layer as an index, and the thickness tolerance of the C layer is preferably 10 nm or less.
  • the surface of the S layer as the base material layer is subjected to corona discharge treatment or the like, and the wetting tension of the surface is preferably 47 mN / m or more, more preferably 50 mN / m.
  • the wetting tension of the surface is preferably 47 mN / m or more, more preferably 50 mN / m. The above is preferable. This is because the adhesion between the C layer and the S layer is improved and the coating property is also improved.
  • the polyester constituting the layer (S layer) using the polyester used as the base material layer is a general term for polymers having an ester bond as the main bond chain of the main chain.
  • Preferred polyesters include ethylene terephthalate, At least one component selected from ethylene-2,6-naphthalate, butylene terephthalate, ethylene- ⁇ , ⁇ -bis (2-chlorophenoxy) ethane-4,4′-dicarboxylate and the like as a main component Can be used. These constituent components may be used singly or in combination of two or more. Among them, it is particularly preferable to use a polyester having ethylene terephthalate as a main constituent in view of quality, economy and the like. In applications where heat acts on the substrate, polyethylene-2,6-naphthalate having excellent heat resistance and rigidity is more preferable.
  • polyesters may be further partially copolymerized with other dicarboxylic acid components and diol components, preferably 20 mol% or less.
  • the intrinsic viscosity (measured in o-chlorophenol at 25 ° C. according to JIS K7367 (2000)) is preferably 0.4 to 1.2 dl / g, more preferably 0.5 to 0.8 dl / g. Is within the range.
  • additives such as antioxidants, heat stabilizers, weathering stabilizers, ultraviolet absorbers, organic lubricants, pigments, dyes, organic or inorganic fine particles, fillers, antistatic agents.
  • An agent, a nucleating agent, a crosslinking agent, etc. may be added to such an extent that the properties are not deteriorated.
  • an ultraviolet absorber in the polyester film in order to impart ultraviolet cutting ability.
  • Preferred examples of the ultraviolet absorber include salicylic acid compounds, benzophenone compounds, benzotriazole compounds, cyanoacrylate compounds, benzoxazinone compounds, cyclic imino ester compounds, and the like.
  • M + P and M / P of the polyester described later M is the concentration of the catalytic metal element remaining in the film (mmol%), P is the concentration of the phosphorus element remaining in the film (mmol%).
  • a benzoxazinone-based compound is most preferable from the viewpoint of the expression of the effect of improving dispersibility by controlling wrinkles. These compounds can be used alone or in combination of two or more. Further, stabilizers such as H A L S and antioxidants can be used in combination, and it is particularly preferable to use a phosphorus-based antioxidant in combination.
  • benzotriazole-based compound examples include 2- (2H-benzotriazol-2-yl) -4,6-bis (1-methyl-1-phenylethyl) phenol and 2- (2H-benzotriazole-2).
  • -Yl) -4- (1,1,3,3-tetramethylbutyl) phenol 2- (2H-benzotriazol-2-yl) -4-methylphenol
  • 2- (2H-benzotriazol-2-yl) -4,6-di-t-amylphenol 2- (2H-benzotriazol-2-yl) -4 -T-butylphenol
  • 2- (2'-hydroxy-3'-t-butyl-5'-methylphenyl) -5-chlorobenzotriazole 2- (2'-hydroxy-3) , Can be exemplified 5'-di -t- butyl-phenyl)
  • benzophenone compounds include 2-hydroxy-4-octoxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2,2'-dihydroxy-4,4'-dimethoxybenzophenone, 2,2 ', 4,4' -Tetrahydroxybenzophenone, 2,4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone-5-sulfonic acid and the like.
  • benzoxazinone compounds examples include 2-p-nitrophenyl-3,1-benzoxazin-4-one, 2- (p-benzoylphenyl) -3,1-benzoxazin-4-one, 2- ( 2-naphthyl) -3,1-benzoxazin-4-one, 2,2'-p-phenylenebis (3,1-benzoxazin-4-one), 2,2 '-(2,6-naphthylene) Examples thereof include bis (3,1-benzoxazin-4-one).
  • the transmittance at a wavelength of 380 nm is preferably 5.0% or less, and the transmittance at 380 nm is more preferably 3.0% or less.
  • the transmittance at a wavelength of 380 nm from the viewpoint of the ultraviolet protection function of other materials and other compounds, and the wavelength at a wavelength of 380 nm from the viewpoint of luminance and light transmittance is defined in the above range, and the total light transmittance, haze, and b value are also controlled while controlling the transmittance within the above range, such as LCD, electronic paper, EL display, plasma display, projection TV member, etc.
  • the addition of fine particles often reduces the properties relating to transparency such as light transmittance and haze.
  • the particle diameter is as small as possible, and preferably less than about 1 ⁇ 4 of the visible light wavelength where scattering is less likely to occur. What has a particle diameter is preferable and it is preferable that the addition amount is also a trace amount.
  • biaxial orientation refers to a pattern showing a biaxial orientation pattern by wide-angle X-ray diffraction.
  • a biaxially oriented polyester film is generally obtained by stretching an unstretched polyester sheet about 2.5 to 5 times in the longitudinal direction and width direction of the sheet, and then applying heat treatment to complete crystal orientation. Can do.
  • the S layer used in the present invention may be a laminated structure in which the S layer itself is two or more layers.
  • the laminated structure for example, a composite film having an inner layer portion and a surface layer portion, which is substantially free of particles in the inner layer portion, and provided with a layer containing particles in the surface layer portion.
  • the inner layer portion and the surface layer portion may be chemically different polymers or the same type of polymers.
  • the layer thickness of the S layer serving as the substrate is not particularly limited and is appropriately selected depending on the application, but is usually 10 to 500 ⁇ m, preferably 20 to 300 ⁇ m.
  • PET polyethylene terephthalate
  • the PET pellets having an intrinsic viscosity of 0.5 to 0.8 dl / g constituting the S layer are vacuum-dried, then supplied to an extruder, melted at 260 to 300 ° C., extruded into a sheet form from a T-shaped die, and electrostatically
  • the film was wound around a mirror casting drum having a surface temperature of 10 to 60 ° C. using an applied casting method, and cooled and solidified to produce an unstretched PET film.
  • This unstretched film is stretched 2.5 to 5 times between rolls heated to 70 to 100 ° C. in the longitudinal direction (referring to the traveling direction of the film and also referred to as “longitudinal direction”).
  • At least one surface of this film is subjected to corona discharge treatment in air, the surface has a wetting tension of 47 mN / m or more, and an aqueous coating material constituting the C layer is applied to the treated surface.
  • the coated optical laminated film is held with a clip and guided to a drying zone, dried at a temperature lower than Tg of the polyester resin (A) constituting the S layer, then raised to a temperature equal to or higher than Tg, and again in the vicinity of Tg. And then continuously stretched by 2.5 to 5 times in the transverse direction (referred to as a direction perpendicular to the film traveling direction) in a heating zone at 70 to 150 ° C., followed by 200 to Heat treatment is performed in a heating zone at 240 ° C.
  • the laminated polyester film of the present invention has a heat shrinkage rate of 0.0 to 0.7% in the width direction (TD) at 120 ° C. in order to obtain high processing suitability for a hard coat, and the width direction (TD) at 190 ° C. ) In the width direction (TD) at 120 ° C.
  • the thermal shrinkage in the width direction (TD) is preferably 0.2 to 0.5%, and at 190 ° C.
  • the thermal shrinkage in the width direction (TD) is preferably ⁇ 0.2 to 0.3%.
  • the thermal shrinkage rate in the width direction (TD) at 190 ° C. is set to a value lower than 120 ° C., which is the above range, in consideration of curling properties during long-term durability. Since it can prevent, it is preferable. This is thought to be due to the fact that the distortion due to the entanglement of amorphous molecular chains that cannot be solved in a short time is gradually released over time. By keeping the state low, it is possible to maintain the temporal stability.
  • a relaxation treatment of 4 to 12% is performed in the heating zone of 200 to 240 ° C. in the transverse stretching step, and again 0.1 to 3.0% in the cooling zone of 100 to 200 ° C. This can be achieved by performing a fine stretching.
  • the thickness of the laminated polyester film is not particularly limited, but preferably 3 to 300 ⁇ m.
  • the coating material used in this case is preferably an aqueous coating material from the viewpoint of environmental pollution and explosion-proof properties.
  • the surface of the layer C of the laminated polyester film according to one aspect of the present invention thus obtained is an initial stage with the hard coat layer using the actinic radiation curable resin because the acrylic resin (Q) is localized.
  • Excellent adhesion, and C layer contains fluorene copolymer polyester resin (A), which is a high refractive index resin, so that the difference in refractive index from the substrate layer can be reduced, and when a hard coat layer is provided on the surface of C layer The suppression of interference fringes can be made excellent.
  • Such a laminated polyester film includes a hard coat film, an antireflection film further provided with an antireflection layer, an optical laminated film for a touch panel provided with a conductive metal oxide layer, an optical laminated film for electronic paper, and the like. It can be used as an optical laminated film for display members.
  • the material constituting the hard coat layer is not particularly limited as long as it transmits visible light, but preferably has a high light transmittance.
  • materials used include acrylic resins, polycarbonate resins, vinyl chloride resins, polyester resins, urethane resins, and actinic radiation curable resins.
  • acrylic resins, urethane resins, and actinic radiation curable resins can be suitably used in terms of scratch resistance, productivity, and the like.
  • the actinic radiation curable resin used as a constituent component of the hard coat layer according to the present invention includes, for example, pentaerythritol tri (meth) acrylate and pentaerythritol tetra (meth) as monomer components constituting the actinic radiation curable resin.
  • styrene In addition to these polyfunctional (meth) acrylic compounds, styrene, chlorostyrene, dichlorostyrene, bromostyrene, dibromostyrene, divinylbenzene are used to control the hardness, transparency, strength, refractive index, etc. of actinic radiation curable resins.
  • a metal such as lead, antimony, titanium, tin, or zinc and (meth) acrylic acid can be used. These may be used alone or in combination of two or more.
  • (meth) acrylic compound is an abbreviation of “methacrylic compound and acrylic compound”, and the same applies to other compounds.
  • a method for curing the actinic radiation curable resin in the present invention for example, a method of irradiating with ultraviolet rays can be used. In this case, about 0.01 to 10 parts by weight of photopolymerization is started with respect to the compound. It is desirable to add an agent.
  • the actinic radiation curable resin used in the present invention is not limited to isopropyl alcohol, ethyl acetate, methyl ethyl ketone, etc. within the range that does not impair the effects of the present invention for the purpose of improving workability during coating and controlling the coating film thickness.
  • An organic solvent can be blended.
  • active rays mean electromagnetic waves that polymerize acrylic vinyl groups such as ultraviolet rays, electron beams, and radiation ( ⁇ rays, ⁇ rays, ⁇ rays, etc.), and practically, ultraviolet rays are simple and preferable.
  • an ultraviolet ray source an ultraviolet fluorescent lamp, a low-pressure mercury lamp, a high-pressure mercury lamp, an ultra-high pressure mercury lamp, a xenon lamp, a carbon arc lamp, or the like can be used.
  • the electron beam method is advantageous in that the apparatus is expensive and requires operation under an inert gas, but it does not need to contain a photopolymerization initiator or a photosensitizer.
  • the refractive index of the hard coat layer in the present invention can be adjusted so that the refractive index difference at the interface with the surface of the C layer is small, thereby suppressing light reflection that causes interference fringes.
  • the refractive index of such a hard coat layer is preferably 1.43 to 1.60, and more preferably 1.45 to 1.55.
  • the thickness of the hard coat layer should be appropriately adjusted and designed according to the intended use and is not particularly limited, but is usually 1 to 10 ⁇ m, preferably 2 to 5 ⁇ m. When the thickness of the hard coat layer is within such a preferable range, the hard coat properties are sufficiently expressed, and on the other hand, the film is not curled due to shrinkage at the time of curing of the hard coat layer.
  • an antireflection layer for suppressing flickering is provided on the surface of the hard coat layer, or an antifouling treatment for preventing contamination is performed.
  • a high refractive index hard coat layer and a low refractive index layer which are antireflection layers, are laminated in this order on the hard coat layer and used as an antireflection film.
  • the antireflection layer is not particularly limited, but can be formed by laminating a low refractive index compound or sputtering or vapor deposition of an inorganic compound such as magnesium fluoride or silicon oxide.
  • an antifouling treatment an antifouling treatment with a silicone resin, a fluorine resin or the like can be performed.
  • the interference fringes generated at each interface of the optical laminated film as described above can be reduced by reducing the waviness amplitude of the spectral reflectance spectrum on the hard coat layer side.
  • the average waviness amplitude of the reflectance at a wavelength of 500 to 600 nm described in the present invention is measured as follows. First, the surface on which the hard coat layer of the optical laminated film is laminated is used as the measurement surface, and the opposite surface is a black glossy tape (Yamato Co., Ltd.) having a width of 50 mm so that the average visible light transmittance at a wavelength of 500 to 600 nm is 5% or less. ) Made of vinyl tape No. 200-50-21: black) is used as a measurement sample so that air bubbles are not caught.
  • FIG. 5 shows the results observed when the measurement surface of the optical laminated film is measured with a spectrophotometer at an incident angle of 5 degrees from the measurement surface. In FIG.
  • the curve represents the relationship between the wavelength and the measured reflectance.
  • the average waviness amplitude of the reflectance on the hard coat layer side is preferably 1.0% or less.
  • the average waviness amplitude is more preferably 0.7% or less, and still more preferably 0.4% or less.
  • the thickness tolerance of the C layer is the maximum and minimum of the measured values obtained by sampling three points at the center and both ends in the width direction of the product roll at three points every 1 m in the flow direction, and using a total of nine points as measurement samples. The difference in values.
  • variety of a product roll is not specifically limited, It will be 300 mm or more from a normal film forming apparatus, and it is about 1.5 m at the maximum.
  • Measurement device Transmission electron microscope (H-7100FA type, manufactured by Hitachi, Ltd.)
  • Measurement conditions Acceleration voltage 100kV -Sample preparation: frozen ultrathin section method-Magnification: 300,000 times.
  • the direction in which the sample was set in the measuring instrument was aligned with the longitudinal direction of the sample in the front-rear direction toward the front of the measuring instrument.
  • an attached Al 2 O 3 plate was used as a standard reflecting plate.
  • the average value of 9 points was used for the measured value.
  • the amount of change in reflectance at a wavelength of 500 nm to 650 nm can be obtained from the difference between the maximum value and the minimum value of the reflectance in the wavelength region.
  • the integrated irradiation intensity was 300 mJ / cm 2 .
  • ultraviolet rays were irradiated and cured, and a hard coat layer was laminated on the laminated polyester film to obtain an optical laminated film.
  • an industrial UV checker UVR-N1 manufactured by Nippon Batteries Co., Ltd. was used for measuring the cumulative irradiation intensity of ultraviolet rays.
  • the refractive index of the hard coat layer was measured at a refractive index of 633 nm with a phase difference measuring device (NPDM-1000 manufactured by Nikon Corporation) for the coating film formed on the silicon wafer by a spin coater. As a result, the refractive index of the hard coat layer was 1.50.
  • the tape was affixed by using a hand roller (HP 515, manufactured by Audio Technica Co., Ltd.) by reciprocating it at a load of 19.6 N / m at a roller moving speed of 5 cm / sec. Subsequently, the tape was peeled off at a speed of 10 cm / second in a direction of 90 ° with respect to the surface direction of the hard coat layer, and a five-step evaluation was performed based on the remaining number of lattices provided in the hard coat layer. Initial adhesion was very good when 5 or more, good when 4 or more, 3 as practical level, and poor initial adhesion as 2 or less.
  • Adhesion index after boiling An optical laminated film was obtained in the same manner as in (4). The obtained optical laminated film was cut into a size of 100 mm ⁇ 100 mm, and the film piece was immersed in boiling water (100 ° C.) made of pure water for 3 hours. Thereafter, the film piece was taken out and dried, and an adhesion test was performed in the same manner as in (6). A five-step evaluation was performed based on the number of remaining lattices, and the adhesion index after boiling was obtained. Adhesiveness after boiling 5 or more was very good, 4 or more was good, 3 was a practical level, and 2 or less was poor adhesion after boiling. In addition, the adhesion test after boiling is a very severe test, and even if this test is poor, there is no practical problem as long as the moisture and heat resistant adhesion index of item (7) is at a practical level.
  • the copolymerization amount of the glycol component (Ab-1) having a fluorene skeleton of the fluorene copolymerized polyester resin (A-1) is the sum of the amount of the dicarboxylic acid component (Aa) and the amount of the glycol component (Ab).
  • the fluorene copolymerized polyester resin (A-1) is a polyester resin that does not have a dicarboxylic acid component (Aa-3) having a sulfonate group.
  • aqueous dispersion (A-1aq) of a fluorene copolymerized polyester resin The composition of the aqueous dispersion (A-1aq) of the fluorene copolymerized polyester resin is shown below.
  • the wetting tension of the resin solid obtained by heating and drying A-1aq was 40 mN / m.
  • Fluorene copolymer polyester resin (A-1) 100 parts (14.993% by weight) Water: 533.1 parts (79.925% by weight) Ammonia: 0.5 part (0.075% by weight) Butyl cellosolve: 33.4 parts (5.007% by weight)
  • (Reference Example 2-1) Preparation of fluorene copolymerized polyester resin (A-2) The following copolymer composition was added all at once, and transesterification and polycondensation were carried out in the same manner as polyester resin (A-1). A copolyester resin (A-2) was obtained. The Tg of the polyester resin was 130 ° C.
  • the copolymerization amount of the glycol component (Ab-1) having a fluorene skeleton of the fluorene copolymerized polyester resin (A-2) is the sum of the amount of the dicarboxylic acid component (Aa) and the amount of the glycol component (Ab). When mol% is assumed, it is 40 mol%.
  • the copolymerization amount of the dicarboxylic acid component (Aa-3) having a sulfonate group is 5 mol% with respect to the amount of the dicarboxylic acid component (Aa).
  • dicarboxylic acid component (Aa-2) having no fluorene skeleton 90 mol parts of dimethyl 2,6-naphthalenedicarboxylate, 5 mol parts of dimethyl isophthalate.
  • glycol component (Ab-1) having a fluorene skeleton 9, 80 mol parts of 9-bis [4- (2-hydroxyethoxy) phenyl] fluorene / glycol component (Ab-2) having no fluorene skeleton, 10 mol parts of ethylene glycol, 10 mol parts of diethylene glycol / dicarboxylic acid having a sulfonate group
  • an acid component (Aa-3) 5 mol parts of dimethyl 5-sodiumsulfoisophthalate.
  • the copolymerization amount of the dicarboxylic acid component (Aa-3) having a sulfonate group is 10 mol% with respect to the amount of the dicarboxylic acid component (Aa).
  • the dicarboxylic acid component (Aa-2) having no fluorene skeleton 90 mole parts of dimethyl 2,6-naphthalenedicarboxylate
  • the glycol component (Ab-1) having a fluorene skeleton 9,9-bis [4- ( 2-hydroxyethoxy) phenyl] fluorene 80 mol part / glycol component (Ab-2) having no fluorene skeleton, ethylene glycol 10 mol part, diethylene glycol 10 mol part / sulfonic acid group-containing dicarboxylic acid component (Aa-3)
  • 10 parts by weight of dimethyl 5-sodiumsulfoisophthalate As 10 parts by weight of dimethyl 5-sodiumsulfoisophthalate.
  • trimellitic acid as a trivalent or higher polyvalent carboxylic acid component (Aa-4) and 100 parts by weight of tetrabutyl titanate with respect to 1 million parts by weight of the total dicarboxylic acid were added at 240 ° C.
  • a polycondensation reaction was performed under reduced pressure at 220 to 280 ° C. to obtain a polyester resin (P-1).
  • the Tg of the polyester resin was 20 ° C.
  • the polyester resin (P-1) is a polyester resin in which a component having a fluorene skeleton is not copolymerized.
  • the polyester resin (P-1) is a polyester resin that does not have a dicarboxylic acid component (Aa-3) having a sulfonate group.
  • polyester resin (P-1)> Dicarboxylic acid component and polycarboxylic acid component) ⁇ 60 mol parts of terephthalic acid ⁇ 15 mol parts of isophthalic acid ⁇ 5 mol parts of sebacic acid ⁇ 20 mol parts of trimellitic acid (glycol component) -40 mol part of diethylene glycol-35 mol part of 1,4-butanediol-25 mol part of ethylene glycol
  • Polyester Resin (P-1) Water Dispersion (P-1aq) Water dispersion was carried out in the same manner as the fluorene copolymerized polyester resin (A-1), and the polyester resin aqueous dispersion ( P-1aq) was obtained. The wetting tension of the resin solid obtained by heating and drying P-1aq was 40 mN / m. The composition of the polyester resin aqueous dispersion (P-1aq) is shown below. Polyester resin (P-1): 100 parts (25.000% by weight) Water: 299.9 parts by weight (74.975% by weight) -Ammonia: 0.1 weight part (0.025 weight%).
  • dimethyl 5-sodiumsulfoisophthalate as a dicarboxylic acid component (Aa-3) having a sulfonate group and 100 parts by weight of tetrabutyl titanate are further added to 1 million parts by weight of the total dicarboxylic acid component.
  • a polycondensation reaction was performed under reduced pressure at 220 to 280 ° C. to obtain a polyester resin (P-2).
  • the Tg of the polyester resin was 20 ° C.
  • the polyester resin (P-2) is a polyester resin in which a component having a fluorene skeleton is not copolymerized.
  • the copolymerization amount of the dicarboxylic acid component (Aa-3) having a sulfonate group is 10 mol% with respect to the amount of the dicarboxylic acid component (Aa).
  • Polyester resin (P-2) 100 parts (25% by weight) -Water: 300 parts (75 weight%).
  • Polyester resin (P-3) was prepared by the transesterification and polycondensation in the following copolymer composition in the same manner as polyester resin (P-2). Obtained.
  • the Tg of the polyester resin was 100 ° C.
  • the polyester resin (P-3) is a polyester resin in which a component having a fluorene skeleton is not copolymerized.
  • the copolymerization amount of the dicarboxylic acid component (Aa-3) having a sulfonate group is 1 mol% with respect to the amount of the dicarboxylic acid component (Aa).
  • polyester resin (P-3)> Dicarboxylic acid component and polycarboxylic acid component) ⁇ 99 parts by mole of 2,6-naphthalenedicarboxylic acid ⁇ 1 mole part of 5-sodiumsulfoisophthalic acid (glycol component) -Ethylene glycol 90 mol part-Diethylene glycol 10 mol part (Reference Example 11-2)
  • Preparation of polyester resin (P-3) aqueous dispersion (P-3aq) 100 parts by weight of polyester resin (P-3) and 400 parts of tetrahydrofuran were dissolved at 80 ° C., and then 500 parts by weight of water at 80 ° C.
  • polyester resin (P-3). 100 parts by weight (10% by weight)
  • -Butyl cellosolve 50 weight part (5 weight%).
  • PET pellets (intrinsic viscosity 0.63 dl / g) substantially free of externally added particles are sufficiently vacuum-dried, then supplied to an extruder, melted at 285 ° C., and sintered by compressing stainless steel fibers. After filtering with a 5 ⁇ m filter and then with a sintered filter of stainless steel powder with an average opening of 14 ⁇ m, it is extruded into a sheet form from a T-shaped die, and mirror casting with a surface temperature of 25 ° C. using an electrostatic application casting method. It was wound around a drum and solidified by cooling. This unstretched film was heated to 90 ° C. and stretched 3.4 times in the longitudinal direction to obtain a uniaxially oriented (uniaxially stretched) film.
  • aqueous dispersions prepared in the above reference examples were mixed at the ratios shown in Table 3 and Table 5 (comparative examples are shown in Table 7 and Table 9), and the aqueous coating composition constituting the C layer was changed to Table 4 and The compositions shown in Table 6 (comparative examples are shown in Tables 8 and 10) were prepared.
  • the obtained aqueous coating material was applied to the uniaxially stretched film using the bar coating method shown in FIG. At this time, the gap (X) between the metalling wire bar and the upstream cover was 1.2 mm, and the gap (Y) between the metalling wire bar and the downstream cover was 0.5 mm.
  • a uniaxially stretched film coated with a water-based coating was held with a clip and guided to a preheating zone, dried and preheated at an atmospheric temperature of 120 ° C., and continuously stretched 3.5 times in the width direction in a 120 ° C. stretching zone.
  • the obtained biaxially oriented (biaxially stretched) film was subsequently heat treated in a heating zone at 230 ° C. for 10 seconds, then subjected to a 7% relaxation treatment while cooling from 230 ° C. to 160 ° C., and subsequently from 160 ° C. to 120 ° C. Re-stretching of 0.5% was performed while cooling to ° C.
  • a laminated polyester film in which the C layer was laminated on the S layer in which crystal orientation was completed by the above method was obtained.
  • the thickness of this laminated polyester film was 125 ⁇ m, the TD heat yield at 120 ° C. for 30 minutes was 0.4%, the TD heat yield at 190 ° C. for 20 minutes was 0.1%, the thickness of the C layer was 128 nm, and the tolerance was 8 nm. .
  • Table 2 shows the characteristics of the obtained laminated polyester film.
  • the interference fringes of the optical laminated film were at a practical level and the average waviness amplitude was good.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Example 2 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the thickness of this laminated polyester film was 125 ⁇ m
  • the thickness of the C layer was 122 nm
  • the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were also very good.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Example 3 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this optical laminated film are shown in Table 2.
  • the interference fringes of the optical laminated film were at a practical level and the average waviness amplitude was good.
  • the wetting tension on the surface of the C layer was 2 mN / m higher than that of the acrylic resin (Q-1) composition film (Comparative Example 7), but both the initial adhesion index with the hard coat layer and the wet heat resistance index were good. However, the adhesion index after boiling was at a practical level.
  • Example 4 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 128 nm, and the tolerance was 8 nm.
  • Table 2 shows the characteristics of the obtained laminated polyester film.
  • the interference fringes of the optical laminated film were at a practical level and the average waviness amplitude was good.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-4) composition film (Comparative Example 9), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are both very good. there were.
  • Example 5 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the thickness of this laminated polyester film was 125 ⁇ m
  • the thickness of the C layer was 122 nm
  • the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were also very good.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-4) composition film (Comparative Example 9), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are both very good. there were.
  • Example 6 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this optical laminated film are shown in Table 2.
  • the interference fringes of the optical laminated film were at a practical level and the average waviness amplitude was good.
  • the wetting tension on the surface of the C layer was 1 mN / m higher than that of the acrylic resin (Q-4) composition film (Comparative Example 9), but both the initial adhesion index to the hard coat layer and the wet heat resistance index were good. However, the adhesion index after boiling was at a practical level.
  • Example 7 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 128 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were practical levels. Further, the wetting tension on the surface of the C layer was the same as that of the acrylic resin (Q-2) composition film (Comparative Example 8), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling were all very good. It was.
  • Example 8 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 122 nm, and the tolerance was 8 nm. The properties of this laminated film are shown in Table 2. The interference fringes and average waviness amplitude of the optical laminated film were also very good. Further, the wetting tension on the surface of the C layer was equivalent to that of the acrylic resin (Q-2) composition film (Comparative Example 8), and both the initial adhesion index and the wet heat resistance index with the hard coat layer were very good. The adhesion index of was good.
  • Example 9 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 123 nm, and the tolerance was 8 nm.
  • the properties of this laminated film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were also very good. Further, since an oxazoline-based crosslinking agent and a carbodiimide-based crosslinking agent were used in addition to the melamine-based crosslinking agent, the adhesion index after boiling with the hard coat layer was improved to a very good level.
  • Example 10 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 3 and 4 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. The minimum value was a practical level, the interference fringes of the optical laminated film were a practical level, and the average waviness amplitude was good. Further, the wetting tension on the surface of the C layer was 1 mN / m higher than that of the acrylic resin (Q-2) composition film (Comparative Example 8), but both the initial adhesion index to the hard coat layer and the wet heat resistance index were good. However, the adhesion index after boiling was at a practical level.
  • Example 11 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 128 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were practical levels.
  • the wetting tension on the surface of the C layer was equivalent to that of the acrylic resin (Q-2) composition film (Comparative Example 8), and the initial adhesion index with the hard coat layer was very good, but the polyester resin having a sulfonic acid group was formed. Although it was a component, the adhesion index after boiling was a rejected level, but the moisture and heat resistance index was good.
  • Example 12 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were practical levels.
  • the wetting tension on the surface of the C layer was 1 mN / m higher than that of the acrylic resin (Q-2) composition film (Comparative Example 8), and the initial adhesion index with the hard coat layer was good.
  • the initial adhesion index was good because it has polyester resin as the main component, but the moisture and heat resistance index is a failure level, and the adhesion index after boiling is not measurable because the hard coat peeled off in the boiling process there were.
  • Example 13 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 128 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were practical levels. Further, the wetting tension on the surface of the C layer was equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index with the hard coat layer was very good, but it constituted a polyester resin having a sulfonic acid group. Although it was a component, the adhesion index after boiling was a rejected level, but the moisture and heat resistance index was good.
  • Example 14 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the thickness of this laminated polyester film was 125 ⁇ m
  • the thickness of the C layer was 122 nm
  • the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were good.
  • the wetting tension on the surface of the C layer was equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index with the hard coat layer was very good, but it constituted a polyester resin having a sulfonic acid group. Since it was a component, the adhesion index after boiling was at a rejected level, but the moist heat resistant index was at a practical level.
  • Example 15 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 123 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. The interference fringes and average waviness amplitude of the optical laminated film were good.
  • an oxazoline-based crosslinking agent and a carbodiimide-based crosslinking agent were used, but because the polyester resin having a sulfonic acid group is a constituent component, the adhesion index after boiling was a failure level, The moisture and heat resistance index was good.
  • Example 16 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were practical levels.
  • the wetting tension on the surface of the C layer was 1 mN / m higher than that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index with the hard coat layer was good.
  • the initial adhesion index was good because it has polyester resin as the main component, but the moisture and heat resistance index is a failure level, and the adhesion index after boiling is not measurable because the hard coat peeled off in the boiling process there were.
  • Example 17 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the thickness of this laminated polyester film was 125 ⁇ m
  • the thickness of the C layer was 81 nm
  • the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were also good.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Example 18 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the thickness of this laminated polyester film was 125 ⁇ m
  • the thickness of the C layer was 162 nm
  • the tolerance was 10 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were also at a practical level.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Example 19 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used and the coating was performed by the bar coating method shown in FIG. At this time, the gap (a) between the metalling wire bar and the upstream cover was 1.2 mm, and the gap (b) between the metalling wire bar and the downstream cover was 0.5 mm. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 122 nm, and the tolerance was 15 nm. The properties of this laminated polyester film are shown in Table 2. Although the average waviness amplitude of the optical laminated film was very good, the interference fringes were partially observed at a slightly stronger level as compared with Example 2.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Example 20 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used and the coating was performed using the gravure coating method.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 122 nm, and the tolerance was 30 nm.
  • the properties of this laminated polyester film are shown in Table 2. Although the average waviness amplitude of the optical laminated film was very good, the interference fringes were partially observed at a slightly stronger level as compared with Example 2.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Example 21 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 5 and 6 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 117 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the interference fringes and average waviness amplitude of the optical laminated film were also at a practical level.
  • the wetting tension on the surface of the C layer was 1 mN / m higher than that of the acrylic resin (Q-1) composition film (Comparative Example 7), but both the initial adhesion index to the hard coat layer and the wet heat resistance index were good. Met. However, the adhesion index after boiling was a failure level.
  • Example 22 Except for applying the corona discharge treatment to both surfaces of the uniaxially stretched film using the aqueous coating agents shown in Tables 5 and 6, and applying the both surfaces using the bar coating method shown in FIG. A laminated polyester film was obtained. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 122 nm on both sides, and the tolerance was 8 nm on both sides. The properties of this laminated polyester film are shown in Table 2. The interference fringes and average waviness amplitude of the optical laminated film were also very good.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Comparative Example 1 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 115 nm, and the tolerance was 25 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. The initial adhesion index was at a practical level, but the moisture and heat resistance adhesion index and the adhesion index after boiling were at a rejected level.
  • Comparative Example 2 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 115 nm, and the tolerance was 20 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. In addition, both the initial adhesion index and the moisture and heat resistance adhesion index were unacceptable levels, and the adhesion index after boiling was not measurable because the hard coat was peeled off during the boiling process.
  • Comparative Example 3 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 115 nm, and the tolerance was 15 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. In addition, both the initial adhesion index and the moisture and heat resistance adhesion index were unacceptable levels, and the adhesion index after boiling was not measurable because the hard coat was peeled off during the boiling process.
  • Comparative Example 4 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 115 nm, and the tolerance was 8 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. The initial adhesion index was at a practical level, but the moisture and heat resistance adhesion index and the adhesion index after boiling were at a rejected level.
  • Comparative Example 5 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 115 nm, and the tolerance was 8 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. In addition, both the initial adhesion index and the moisture and heat resistance adhesion index were unacceptable levels, and the adhesion index after boiling was not measurable because the hard coat was peeled off during the boiling process.
  • Comparative Example 6 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m and the C layer had a thickness of 115 nm.
  • the properties of this laminated polyester film are shown in Table 2. Since the polyester resin having a naphthalene skeleton is the main composition of the layer C of this laminated polyester film, the stretchability of the layer C is poor and whitening occurred in the stretching step, so the predetermined evaluation was not performed.
  • Comparative Example 7 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 136 nm, and the tolerance was 8 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. Further, the initial adhesion index, the moist heat resistance index and the adhesion index after boiling were all very good.
  • Comparative Example 8 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 136 nm, and the tolerance was 8 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. Further, the initial adhesion index, the moist heat resistance index and the adhesion index after boiling were all very good.
  • Comparative Example 9 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 136 nm, and the tolerance was 8 nm. The properties of this laminated polyester film are shown in Table 2. Both the average swell amplitude and the fringe pattern of the optical laminated film were unacceptable. Moreover, both the initial adhesion index and the moist heat resistance index were very good, and the adhesion index after boiling was good.
  • Comparative Example 10 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 7 and 8 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 130 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are all very good. there were.
  • Comparative Example 11 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the wetting tension on the surface of the C layer is equivalent to that of the polyester resin (A-1) composition film (Comparative Example 1), and the initial adhesion index with the hard coat layer is a practical level, the moisture and heat resistance index and the adhesion index after boiling are rejected. It was a level.
  • Comparative Example 12 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 130 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-4) composition film (Comparative Example 9), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are both very good. there were.
  • Comparative Example 13 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 130 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels. Further, the wetting tension on the surface of the C layer was equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index with the hard coat layer was very good, but the moisture and heat resistance index was good. However, the adhesion index after boiling was not acceptable.
  • Comparative Example 14 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the wetting tension on the surface of the C layer is similar to that of the polyester resin (A-3) composition film (Comparative Example 1), the initial adhesion index with the hard coat layer is a practical level, and the moisture and heat resistance index is a reject level. The adhesion index after boiling was not measurable because the hard coat was peeled off during the boiling process.
  • Comparative Example 15 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 128 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels. Moreover, both the initial adhesion index with the hard coat layer and the wet heat resistance index were good, and the adhesion index after boiling was at a practical level.
  • Comparative Example 16 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the initial adhesion index with the hard coat layer and the moisture and heat resistance adhesion index were practical levels, but the boiling index after boiling was a failure level.
  • Comparative Example 17 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 128 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the wetting tension on the surface of the C layer was equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index with the hard coat layer was very good. Since the resin contains a large amount of sulfonate group, the moisture and heat resistance index was unacceptable, and the adhesion index after boiling was not measurable because the hard coat was peeled off during the boiling process.
  • Comparative Example 18 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m, the C layer had a thickness of 116 nm, and the tolerance was 8 nm.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the wetting tension on the surface of the C layer is the same as that of the acrylic resin (Q-1) composition film (Comparative Example 7).
  • the main component of the C layer is a polyester resin, the initial adhesion index with the hard coat layer is extremely high. Since the polyester resin contains a large amount of sulfonate group, the moisture and heat resistance index is unacceptable, and the adhesion index after boiling was not measurable because the hard coat was peeled off during the boiling process. .
  • Comparative Example 19 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used. The thickness of this laminated polyester film was 125 ⁇ m, the thickness of the C layer was 122 nm, and the tolerance was 8 nm. The properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels. Further, the wetting tension on the surface of the C layer is equivalent to that of the acrylic resin (Q-1) composition film (Comparative Example 7), and the initial adhesion index to the hard coat layer, the moisture and heat resistance index, and the adhesion index after boiling are extremely good. It was.
  • Comparative Example 20 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the laminated polyester film had a thickness of 125 ⁇ m and the C layer had a thickness of 122 nm.
  • the properties of this laminated polyester film are shown in Table 2.
  • the ratio of the polyester resin having a naphthalene skeleton as a constituent component of the C layer is high, but since the acrylic resin (Q-1) is added, the stretchability of the C layer is improved and the whitening tends to be improved. However, since the coating unevenness of the appearance of the C layer remained, it could not be used as an optical film, so the predetermined evaluation was not performed.
  • Comparative Example 21 A laminated polyester film was obtained in the same manner as in Example 1 except that the aqueous coating agents shown in Tables 9 and 10 were used.
  • the thickness of this laminated polyester film was 125 ⁇ m
  • the thickness of the C layer was 115 nm
  • the tolerance was 8 nm.
  • Part of the polyester resin having a naphthalene skeleton was contained as a component of the C layer, but no whitening occurred because the polyester resin (P-1) was the main component.
  • the properties of this laminated polyester film are shown in Table 2. Both the interference fringes and the average waviness amplitude of the optical laminated film were unacceptable levels.
  • the adhesion index after boiling was a failure level.
  • the laminated polyester film of the present invention is useful for a hard coat film because of its excellent adhesion to a hard coat layer in a high temperature and high humidity environment. In particular, it is excellent in reducing iris patterns and is suitable as a laminated film for display members such as touch panels.

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  • Physics & Mathematics (AREA)
  • Chemical & Material Sciences (AREA)
  • Medicinal Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Laminated Bodies (AREA)
  • Coating Of Shaped Articles Made Of Macromolecular Substances (AREA)
  • Polyesters Or Polycarbonates (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

[Problème] L'invention a pour objet de fournir un film polyester stratifié qui constitue un film hautement adhésif pour un usage optique, qui dispose d'une excellente capacité de traitement et d'une excellente adhésion à une couche de revêtement dur, tout en supprimant des motifs d'interférence lorsqu'il est utilisé comme base pour un film de revêtement dur à usage optique, ledit film polyester stratifié supprimant non seulement les motifs d'interférence mais réalisant aussi une adhésion dans des environnements de haute température et haute humidité, et pouvant être revêtu par un procédé de revêtement en ligne à nivaux élevés. [Solution] L'invention met en oeuvre un film polyester stratifié obtenu par laminage d'une couche stratifiée (couche C) sur au moins une surface d'un film polyester, qui est caractérisé en ce que la valeur minimale de la réflectance spectrale (Rmin) sur le côté de la couche C à une longueur d'onde de 500 nm à 650 nm est de 4,0 à 6,0 % (inclusifs) et la quantité de changement (?r) de la réflectance spectrale est de 0,0 à 1,0 % (inclusif).
PCT/JP2011/068026 2010-08-10 2011-08-08 Film polyester stratifié et film stratifié optique utilisant celui-ci Ceased WO2012020722A1 (fr)

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WO2012144418A1 (fr) * 2011-04-18 2012-10-26 三菱樹脂株式会社 Film revêtu
WO2015098477A1 (fr) * 2013-12-27 2015-07-02 東レ株式会社 Film polyester multicouche
JPWO2013137101A1 (ja) * 2012-03-16 2015-08-03 東レ株式会社 積層フィルムおよびその製造方法
CN104995240A (zh) * 2013-03-26 2015-10-21 东丽株式会社 层合聚酯膜
JP2016014085A (ja) * 2014-07-01 2016-01-28 東レ株式会社 積層ポリエステルフィルムおよびその製造方法
JP2016210039A (ja) * 2015-05-01 2016-12-15 三菱樹脂株式会社 ハードコートフィルム
JP2016210040A (ja) * 2015-05-01 2016-12-15 三菱樹脂株式会社 両面ハードコートフィルム
WO2025197272A1 (fr) * 2024-03-22 2025-09-25 東洋紡エムシー株式会社 Composition pour matériau de revêtement aqueux utilisant une résine de polyester

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KR102032316B1 (ko) * 2018-07-09 2019-10-15 에스케이씨 주식회사 광학 다층 필름, 이를 포함하는 광학 부품 및 표시장치

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WO2012144418A1 (fr) * 2011-04-18 2012-10-26 三菱樹脂株式会社 Film revêtu
JP2012224696A (ja) * 2011-04-18 2012-11-15 Mitsubishi Plastics Inc 塗布フィルム
JPWO2013137101A1 (ja) * 2012-03-16 2015-08-03 東レ株式会社 積層フィルムおよびその製造方法
CN104995240A (zh) * 2013-03-26 2015-10-21 东丽株式会社 层合聚酯膜
CN104995240B (zh) * 2013-03-26 2017-09-22 东丽株式会社 层合聚酯膜
WO2015098477A1 (fr) * 2013-12-27 2015-07-02 東レ株式会社 Film polyester multicouche
JPWO2015098477A1 (ja) * 2013-12-27 2017-03-23 東レ株式会社 積層ポリエステルフィルム
TWI633010B (zh) * 2013-12-27 2018-08-21 東麗股份有限公司 Laminated polyester film
JP2016014085A (ja) * 2014-07-01 2016-01-28 東レ株式会社 積層ポリエステルフィルムおよびその製造方法
JP2016210039A (ja) * 2015-05-01 2016-12-15 三菱樹脂株式会社 ハードコートフィルム
JP2016210040A (ja) * 2015-05-01 2016-12-15 三菱樹脂株式会社 両面ハードコートフィルム
WO2025197272A1 (fr) * 2024-03-22 2025-09-25 東洋紡エムシー株式会社 Composition pour matériau de revêtement aqueux utilisant une résine de polyester

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TW201210823A (en) 2012-03-16
CN103079825B (zh) 2015-04-29

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