WO2010026773A1 - 積層ポリエステルフィルム - Google Patents
積層ポリエステルフィルム Download PDFInfo
- Publication number
- WO2010026773A1 WO2010026773A1 PCT/JP2009/004404 JP2009004404W WO2010026773A1 WO 2010026773 A1 WO2010026773 A1 WO 2010026773A1 JP 2009004404 W JP2009004404 W JP 2009004404W WO 2010026773 A1 WO2010026773 A1 WO 2010026773A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- layer
- polyester film
- coating
- film
- polyester
- Prior art date
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/042—Coating with two or more layers, where at least one layer of a composition contains a polymer binder
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B27/00—Layered products comprising a layer of synthetic resin
- B32B27/18—Layered products comprising a layer of synthetic resin characterised by the use of special additives
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/043—Improving the adhesiveness of the coatings per se, e.g. forming primers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J7/00—Chemical treatment or coating of shaped articles made of macromolecular substances
- C08J7/04—Coating
- C08J7/046—Forming abrasion-resistant coatings; Forming surface-hardening coatings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/35—Heterocyclic compounds having nitrogen in the ring having also oxygen in the ring
- C08K5/357—Six-membered rings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/02—Diffusing elements; Afocal elements
- G02B5/0273—Diffusing elements; Afocal elements characterized by the use
- G02B5/0284—Diffusing elements; Afocal elements characterized by the use used in reflection
-
- 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
- B32B2250/00—Layers arrangement
- B32B2250/24—All layers being polymeric
- B32B2250/244—All polymers belonging to those covered by group B32B27/36
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/26—Polymeric coating
-
- 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
- B32B2270/00—Resin or rubber layer containing a blend of at least two different 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
- B32B2307/00—Properties of the layers or laminate
- B32B2307/70—Other properties
- B32B2307/71—Resistive to light or to UV
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B2457/00—Electrical equipment
- B32B2457/20—Displays, e.g. liquid crystal displays, plasma displays
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2367/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
- C08J2367/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2433/00—Characterised by the use 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; Derivatives of such polymers
- C08J2433/04—Characterised by the use 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; Derivatives of such polymers esters
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2475/00—Characterised by the use of polyureas or polyurethanes; Derivatives of such polymers
- C08J2475/04—Polyurethanes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31551—Of polyamidoester [polyurethane, polyisocyanate, polycarbamate, etc.]
- Y10T428/31565—Next to polyester [polyethylene terephthalate, etc.]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/31504—Composite [nonstructural laminate]
- Y10T428/31786—Of polyester [e.g., alkyd, etc.]
- Y10T428/31797—Next to addition polymer from unsaturated monomers
Definitions
- the present invention relates to a laminated polyester film suitable as a base film for a light diffusing sheet, for example, a backlight unit of a liquid crystal display, etc., reducing interference unevenness due to light reflection, and a light diffusing layer or an anti-sticking layer. It is related with the laminated polyester film for various optics which requires the favorable adhesiveness of this.
- liquid crystal displays have been widely used as display devices for televisions, personal computers, digital cameras, mobile phones and the like. Since these liquid crystal displays do not have a light emitting function by a liquid crystal display unit alone, a method of displaying by irradiating light using a backlight from the back side is widespread.
- the backlight system has a structure called an edge light type or a direct type. Recently, there is a tendency to reduce the thickness of liquid crystal displays, and an edge light type is increasingly used.
- the edge light type is generally configured in the order of a reflection sheet, a light guide plate, a light diffusion sheet, and a prism sheet. As the flow of light, the light incident on the light guide plate from the backlight is reflected by the reflection sheet and emitted from the surface of the light guide plate. The light beam emitted from the light guide plate enters the light diffusion sheet, is diffused and emitted by the light diffusion sheet, and then enters the next existing prism sheet. The light beam is condensed in the normal direction by the prism sheet and emitted toward the liquid crystal layer.
- the light diffusing sheet used in this configuration is used for uniformly diffusing transmitted light in multiple directions, and needs to have high light diffusibility and high light transmittance.
- the surface of the sheet is roughened by heating and pressing during finishing, so-called embossing, or a light diffusing layer made of a transparent resin containing particles on a transparent base film
- embossing or a light diffusing layer made of a transparent resin containing particles on a transparent base film
- embossing or a light diffusing layer made of a transparent resin containing particles on a transparent base film
- a binder and a small amount of beads are used to prevent sticking (partial adhesion) between the light diffusion sheet and the light guide plate on the surface of the transparent base film opposite to the light diffusion layer. It has also been proposed to form a sticking-preventing layer containing Pt (Patent Documents 1 to 3).
- a polyester film is generally used as the transparent base film for forming the light diffusion sheet in consideration of transparency and mechanical properties, and improves the adhesion between the base polyester film and the light diffusion layer or anti-sticking layer.
- an easily adhesive coating layer is generally provided as the intermediate layer.
- the refractive index of the coating layer is not adjusted, the occurrence of uneven interference may not be sufficiently suppressed.
- various problems due to deterioration in visibility may become apparent.
- various problems caused by the deterioration of visibility caused by interference unevenness may cause eye fatigue and health problems.
- Patent Document 4 a method of increasing the refractive index of the coating layer by combining an aqueous polyester resin and a metal chelate compound such as a water-soluble titanium chelate compound has been proposed ( Patent Document 4).
- Patent Document 4 a method of increasing the refractive index of the coating layer by combining an aqueous polyester resin and a metal chelate compound such as a water-soluble titanium chelate compound.
- Patent Document 4 a method of increasing the refractive index of the coating layer by combining an aqueous polyester resin and a metal chelate compound such as a water-soluble titanium chelate compound.
- the stability of the coating solution may not be sufficient, and when performing production for a long time, there is a possibility of increasing the liquid exchange work.
- adhesiveness may not be enough depending on resin used for a light-diffusion layer, or the conditions of an endurance test.
- polyester film Furthermore, in recent price competition in liquid crystal displays, it is necessary to reduce costs, and it is very useful to reuse polyester film. However, in this coating layer configuration, it is necessary to reuse it for reuse. The color when melted is large, and the light diffusion sheet to be formed becomes yellow, and cannot be used effectively.
- Patent Documents 5 and 6 As another method for increasing the refractive index of the coating layer, it is also known to use a compound having a condensed polycyclic aromatic (Patent Documents 5 and 6).
- hard coat layers and antireflection layers formed on coating layers for antireflection films are generally refracted compared to light diffusion layers and antisticking layers formed for light diffusion films. The rate is high. Therefore, the refractive index of the coating layer suitably used for the antireflection film is very high. On the contrary, for the light diffusing sheet, the refractive index is too high, thereby causing interference unevenness.
- the hard coat layer or antireflection layer formed for the antireflection film and the light diffusion layer or antisticking layer formed for the light diffusion film have different components. Therefore, even if an application layer showing good adhesion is used for an antireflection film, it does not always show perfect adhesion for a light diffusing film.
- JP 2000-89007 A Japanese Patent Laid-Open No. 2004-4598 JP 2007-286166 A JP 2006-20993 A JP 2006-175628 A JP 2007-181994 A JP 2005-37591 A JP 2002-174704 A JP 2003-302629 A
- an object of the present invention is to provide a laminated polyester film for a light diffusion sheet that can be suitably used in a backlight unit of a liquid crystal display.
- the gist of the present invention resides in a laminated polyester film having a coating layer containing a compound having a condensed polycyclic aromatic and a urethane resin or an acrylic resin on both sides of the polyester film.
- the polyester film constituting the laminated polyester film in the present invention may have a single layer structure or a multilayer structure, and may have four or more layers as long as it does not exceed the gist of the present invention other than a two-layer or three-layer structure. It may be a multilayer, and is not particularly limited.
- an ultraviolet absorber can be contained in order to prevent the liquid crystal of the liquid crystal display from being deteriorated by ultraviolet rays.
- the ultraviolet absorber is not particularly limited as long as it is a compound having ultraviolet absorbing ability and can withstand the heat applied in the production process of the polyester film.
- an organic ultraviolet absorber there are an organic ultraviolet absorber and an inorganic ultraviolet absorber, and an organic ultraviolet absorber is preferable from the viewpoint of transparency.
- an organic type ultraviolet absorber For example, a cyclic imino ester type, a benzotriazole type, a benzophenone type etc. are mentioned. From the viewpoint of durability, a cyclic imino ester type and a benzotriazole type are more preferable. It is also possible to use two or more ultraviolet absorbers in combination.
- the benzotriazole-based ultraviolet absorber is not limited to the following, and examples thereof include 2- [2′-hydroxy-5 ′-(methacryloyloxymethyl) phenyl] -2H-benzotriazole, 2- [2 '-Hydroxy-5'-(methacryloyloxyethyl) phenyl] -2H-benzotriazole, 2- [2'-hydroxy-5 '-(methacryloyloxypropyl) phenyl] -2H-benzotriazole, 2- [2'- Hydroxy-5 '-(methacryloyloxyhexyl) phenyl] -2H-benzotriazole, 2- [2'-hydroxy-3'-tert-butyl-5'-(methacryloyloxyethyl) phenyl] -2H-benzotriazole, 2 -[2'-hydroxy-5'-tert-butyl-3 '-(methac Royloxyethyl)
- the cyclic imino ester-based ultraviolet absorber is not limited to the following, and examples thereof include 2-methyl-3,1-benzoxazin-4-one and 2-butyl-3,1-benzoxazine-4. -One, 2-phenyl-3,1-benzoxazin-4-one, 2- (1- or 2-naphthyl) -3,1-benzoxazin-4-one, 2- (4-biphenyl) -3, 1-benzoxazin-4-one, 2-p-nitrophenyl-3,1-benzoxazin-4-one, 2-m-nitrophenyl-3,1-benzoxazin-4-one, 2-p-benzoyl Phenyl-3,1-benzoxazin-4-one, 2-p-methoxyphenyl-3,1-benzoxazin-4-one, 2-o-methoxyphenyl-3,1-benzoxazin-4-one 2-cyclohexyl-3,1-benzoxazin-4-one, 2-
- a benzoxazinone-based compound which is difficult to be yellowed is preferably used.
- a compound represented by the following general formula (1) is more preferably used. It is done.
- R represents a divalent aromatic hydrocarbon group
- X 1 and X 2 are each independently selected from hydrogen or the following functional group group, but are not necessarily limited thereto.
- the amount of the ultraviolet absorber to be contained in the laminated polyester film of the present invention depends on the thickness of the polyester film and cannot be generally stated, but is 10.0% by weight or less, preferably 0.1 to 3.0% by weight. % In the range. When an ultraviolet absorber in an amount exceeding 10.0% by weight is contained, the ultraviolet absorber may bleed out on the surface, which may cause deterioration of surface functionality such as adhesion deterioration.
- the ultraviolet absorber is preferably blended in the intermediate layer.
- the compound can be prevented from bleeding out to the film surface, and as a result, properties such as film adhesion can be maintained.
- the light transmittance at a wavelength of 380 nm is preferably 10% or less, as a guideline, in order to prevent deterioration of liquid crystal due to ultraviolet rays. Preferably it is 5% or less.
- the polyester used in the present invention may be a homopolyester or a copolyester.
- a homopolyester those obtained by polycondensation of an aromatic dicarboxylic acid and an aliphatic glycol are preferred.
- the aromatic dicarboxylic acid include terephthalic acid and 2,6-naphthalenedicarboxylic acid
- examples of the aliphatic glycol include ethylene glycol, diethylene glycol, and 1,4-cyclohexanedimethanol.
- Typical polyester includes polyethylene terephthalate and the like.
- examples of the dicarboxylic acid component of the copolyester include isophthalic acid, phthalic acid, terephthalic acid, 2,6-naphthalenedicarboxylic acid, adipic acid, sebacic acid, and oxycarboxylic acid (for example, p-oxybenzoic acid).
- examples of the glycol component include one or more types such as ethylene glycol, diethylene glycol, propylene glycol, butanediol, 4-cyclohexanedimethanol, neopentyl glycol and the like.
- the oligomer contained in the film is deposited on the surface of the film, and may cause deterioration of the visibility of the film due to contamination of the production line or deterioration of the film haze, etc. It is also possible to use a material in which the amount of oligomer contained as a polyester forming the outermost layer of the multilayer structure film is reduced. As a method for reducing the amount of oligomer in the polyester, solid phase polymerization or the like can be used.
- the polyester layer of the film of the present invention it is preferable to blend particles for the main purpose of imparting slipperiness and preventing scratches in each step.
- the kind of the particle to be blended is not particularly limited as long as it is a particle capable of imparting slipperiness. Specific examples thereof include silica, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, calcium phosphate, and phosphoric acid. Examples of the particles include magnesium, kaolin, aluminum oxide, and titanium oxide. Further, the heat-resistant organic particles described in JP-B-59-5216, JP-A-59-217755 and the like may be used.
- thermosetting urea resins examples include thermosetting urea resins, thermosetting phenol resins, thermosetting epoxy resins, benzoguanamine resins, and the like.
- precipitated particles obtained by precipitating and finely dispersing a part of a metal compound such as a catalyst during the polyester production process can also be used.
- the shape of the particles to be used is not particularly limited, and any of a spherical shape, a block shape, a rod shape, a flat shape, and the like may be used. Moreover, there is no restriction
- the average particle size of the particles used is usually in the range of 0.01 to 3 ⁇ m, preferably 0.1 to 2 ⁇ m. If the average particle size is less than 0.01 ⁇ m, the slipperiness may not be sufficiently imparted, or the particles may be aggregated to make the dispersibility insufficient, thereby reducing the transparency of the film. On the other hand, when the thickness exceeds 3 ⁇ m, the surface roughness of the film becomes too rough, and a problem may occur when a light diffusion layer, a sticking prevention layer, or the like is formed in a subsequent process.
- the content of particles in the polyester layer is usually in the range of 0.001 to 5% by weight, preferably 0.005 to 3% by weight.
- the particle content is less than 0.001% by weight, the slipperiness of the film may be insufficient.
- the content exceeds 5% by weight, the transparency of the film is insufficient. There is.
- the method for adding particles to the polyester layer is not particularly limited, and a conventionally known method can be adopted.
- it can be added at any stage for producing the polyester constituting each layer, but it is preferably added after completion of esterification or transesterification.
- a method of blending a slurry of particles dispersed in ethylene glycol or water with a vented kneading extruder and a polyester raw material, or a blending of dried particles and a polyester raw material using a kneading extruder is done by methods.
- antioxidants In addition to the above-mentioned particles, conventionally known antioxidants, antistatic agents, thermal stabilizers, lubricants, dyes, pigments, and the like can be added to the polyester film in the present invention as necessary.
- the thickness of the polyester film in the present invention is not particularly limited as long as it can be formed as a film, but is usually in the range of 10 to 350 ⁇ m, preferably 50 to 250 ⁇ m.
- a production example of the polyester film in the present invention will be specifically described, but is not limited to the following production examples. That is, a method of using the polyester raw material described above and cooling and solidifying a molten sheet extruded from a die with a cooling roll to obtain an unstretched sheet is preferable. In this case, in order to improve the flatness of the sheet, it is preferable to improve the adhesion between the sheet and the rotary cooling drum, and an electrostatic application adhesion method and / or a liquid application adhesion method is preferably employed. Next, the obtained unstretched sheet is stretched in the biaxial direction. In that case, first, the unstretched sheet is stretched in one direction by a roll or a tenter type stretching machine.
- the stretching temperature is usually 70 to 120 ° C., preferably 80 to 110 ° C., and the stretching ratio is usually 2.5 to 7 times, preferably 3.0 to 6 times.
- the film is stretched in the direction perpendicular to the first stretching direction.
- the stretching temperature is usually 70 to 170 ° C.
- the stretching ratio is usually 3.0 to 7 times, preferably 3.5 to 6 times. is there.
- heat treatment is performed at a temperature of 180 to 270 ° C. under tension or relaxation within 30% to obtain a biaxially oriented film.
- a method in which stretching in one direction is performed in two or more stages can be employed. In that case, it is preferable to carry out so that the draw ratios in the two directions finally fall within the above ranges.
- the simultaneous biaxial stretching method can be adopted for the production of the polyester film constituting the laminated polyester film.
- the simultaneous biaxial stretching method is a method in which the above-mentioned unstretched sheet is stretched and oriented simultaneously in the machine direction and the width direction in a state where the temperature is usually controlled at 70 to 120 ° C., preferably 80 to 110 ° C. Is 4 to 50 times, preferably 7 to 35 times, and more preferably 10 to 25 times in terms of area magnification. Subsequently, heat treatment is performed at a temperature of 170 to 250 ° C. under tension or under relaxation within 30% to obtain a stretched oriented film.
- a conventionally known stretching method such as a screw method, a pantograph method, or a linear driving method can be employed.
- the coating layer constituting the laminated polyester film in the present invention
- the coating layer it may be provided by in-line coating, which treats the film surface during the stretching process of the polyester film, or may be applied off-system on the film once manufactured, and may employ both offline coating. You may use together.
- In-line coating is preferably used in that it can be applied at the same time as film formation, and thus can be manufactured at low cost, and the thickness of the coating layer can be changed by the draw ratio.
- the in-line coating is not limited to the following, for example, in the sequential biaxial stretching, a coating treatment can be performed particularly before the lateral stretching after the longitudinal stretching is finished.
- a coating layer is provided on a polyester film by in-line coating, coating can be performed simultaneously with film formation, and the coating layer can be processed at a high temperature, and a film suitable as a polyester film can be produced.
- the present invention it is an essential requirement to have a coating layer containing a compound having a condensed polycyclic aromatic and a urethane resin or an acrylic resin on both sides of the polyester film.
- the optimum refractive index of the coating layer in which interference unevenness hardly occurs is designed to be in the vicinity of the geometric mean of the refractive index of the polyester film and the refractive index of the light diffusion layer or the anti-sticking layer.
- the polyester film is positioned between these layers.
- the ideal refractive index of the coating layer is about 1.57, which is usually a high refractive index that is difficult to achieve with only urethane resin or acrylic resin as a coating layer component used for imparting easy adhesion. It is. Therefore, it is necessary to prepare a higher refractive index, and by using a condensed polycyclic aromatic capable of designing a compound that can prevent a decrease in adhesion, there is no interference unevenness and adhesion is good. A technique for forming the coating layer is effective.
- the coating layers laminated on both surfaces may be formed with the same coating layer or different coating layers as long as the gist of the present invention is not impaired.
- the coating layers are preferably the same in consideration of manufacturing convenience.
- different coating layers are required, for example, the refractive index of the light diffusion layer formed on one surface and the refractive index of the anti-sticking layer formed on the other surface are significantly different, and interference unevenness does not occur in both.
- the same coating layer provides good adhesion. There are cases where this is not possible.
- the same or similar compound as the resin for forming the light diffusion layer and the anti-sticking layer in consideration of the convenience of production. Therefore, it is possible to cope with the same coating layer, and the coating layer is also preferable because the same layer is more convenient for manufacturing.
- condensed polycyclic aromatic in the present invention are compounds having a structure represented by the following formula.
- the compound having a condensed polycyclic aromatic is preferably a polymer compound such as a polyester resin, an acrylic resin, or a urethane resin.
- polyester resins are more preferable because more condensed polycyclic aromatics can be introduced.
- a method of incorporating the condensed polycyclic aromatic into the polyester resin for example, two or more hydroxyl groups are introduced into the condensed polycyclic aromatic as a substituent to form a diol component or a polyvalent hydroxyl component, or There is a method in which two or more acid groups are introduced to prepare a dicarboxylic acid component or a polyvalent carboxylic acid component.
- the condensed polycyclic aromatic contained in the coating layer is preferably a compound having a naphthalene skeleton in that it is difficult to be colored.
- a resin incorporating a naphthalene skeleton as a polyester component is preferably used in terms of good adhesion to the light diffusion layer or anti-sticking layer formed on the coating layer and transparency.
- Representative examples of the naphthalene skeleton include 1,5-naphthalenedicarboxylic acid, 2,6-naphthalenedicarboxylic acid, and 2,7-naphthalenedicarboxylic acid.
- the condensed polycyclic aromatic has a refractive index of a refractive index by introducing a substituent containing a sulfur element, an aromatic substituent such as a phenyl group, a halogen element group, and the like. Improvements can be expected, and substituents such as alkyl groups, ester groups, and amide groups may be introduced from the viewpoints of coatability and adhesion.
- the acrylic resin in the present invention is a polymer composed of a polymerizable monomer having a carbon-carbon double bond, as typified by an acrylic or methacrylic monomer. These may be either a homopolymer or a copolymer. Moreover, the copolymer of these polymers and other polymers (for example, polyester, polyurethane, etc.) is also included. For example, a block copolymer or a graft copolymer. Alternatively, a polymer (possibly a mixture of polymers) obtained by polymerizing a polymerizable monomer having a carbon-carbon double bond in a polyester solution or a polyester dispersion is also included.
- a polymer (in some cases, a mixture of polymers) obtained by polymerizing a polymerizable monomer having a carbon-carbon double bond in a polyurethane solution or polyurethane dispersion is also included.
- a polymer (in some cases, a polymer mixture) obtained by polymerizing a polymerizable monomer having a carbon-carbon double bond in another polymer solution or dispersion is also included.
- the polymerizable monomer having a carbon-carbon double bond is not particularly limited, but particularly representative compounds include, for example, acrylic acid, methacrylic acid, crotonic acid, itaconic acid, fumaric acid, maleic acid, citracone Various carboxyl group-containing monomers such as acids, and salts thereof; 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, monobutyl hydroxyl fumarate, Various hydroxyl group-containing monomers such as monobutylhydroxy itaconate; various monomers such as methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, lauryl (meth) acrylate ( (Meth) acrylic acid esters Various nitrogen-containing vinyl monomers such as (meth) acrylamide, diacetone acrylamide, N-methylolacryl
- the acrylic resin can contain a sulfur compound, an aromatic compound, or the like as long as the adhesive properties are not impaired.
- an acrylic resin containing a functional group such as a hydroxyl group, an amino group, or an amide group.
- the urethane resin in the present invention is a polymer compound having a urethane bond in the molecule.
- a water-dispersible or water-soluble urethane resin is preferable.
- a hydrophilic group such as a hydroxyl group, a carboxyl group, a sulfonic acid group, a sulfonyl group, a phosphoric acid group, or an ether group into the urethane resin.
- a carboxylic acid group or a sulfonic acid group is preferable from the viewpoint of coating film properties and adhesion.
- One of the methods for producing a urethane resin that is a constituent component of the coating layer used in the present invention is a reaction between a hydroxyl group and an isocyanate.
- a polyol is preferably used, and examples thereof include polyether polyols, polyester polyols, polycarbonate polyols, polyolefin polyols, and acrylic polyols. These compounds may be used alone or in combination.
- polyether polyols examples include polyethylene glycol, polypropylene glycol, polyethylene propylene glycol, polytetramethylene ether glycol, polyhexamethylene ether glycol and the like.
- Polyester polyols include polycarboxylic acids (malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, fumaric acid, maleic acid, terephthalic acid, isophthalic acid, etc.) or their acid anhydrides.
- polycarboxylic acids malonic acid, succinic acid, glutaric acid, adipic acid, pimelic acid, suberic acid, sebacic acid, fumaric acid, maleic acid, terephthalic acid, isophthalic acid, etc.
- polyhydric alcohol ethylene glycol, diethylene glycol, triethylene glycol, propylene glycol, dipropylene glycol, tripropylene glycol, butanediol, 1,3-butanediol, 1,4-butanediol, 2,3-butanediol, 2-methyl-1,3-propanediol, 1,5-pentanediol, neopentyl glycol, 1,6-hexanediol, 3-methyl-1,5-pentanediol, 2-methyl-2,4-pentanediol 2-methyl-2-propyl- , 3-propanediol, 1,8-octanediol, 2,2,4-trimethyl-1,3-pentanediol, 2-ethyl-1,3-hexanediol, 2,5-dimethyl-2,5-hexane Diol, 1,9-nonanediol
- polycarbonate polyols examples include polycarbonate diols obtained by dealcoholization reaction from polyhydric alcohols and dimethyl carbonate, diethyl carbonate, diphenyl carbonate, ethylene carbonate, and the like, such as poly (1,6-hexylene) carbonate, poly ( And 3-methyl-1,5-pentylene) carbonate.
- polyisocyanate compound used to obtain the urethane resin examples include aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, methylene diphenyl diisocyanate, phenylene diisocyanate, naphthalene diisocyanate, and tolidine diisocyanate, ⁇ , ⁇ , ⁇ ′, ⁇ ′.
- aromatic diisocyanates such as tolylene diisocyanate, xylylene diisocyanate, methylene diphenyl diisocyanate, phenylene diisocyanate, naphthalene diisocyanate, and tolidine diisocyanate, ⁇ , ⁇ , ⁇ ′, ⁇ ′.
- -Aliphatic diisocyanates having aromatic rings such as tetramethylxylylene diisocyanate, aliphatic diisocyanates such as methylene diisocyanate, propylene diisocyanate, trimethylhexamethylene diisocyanate, hexamethylene diisocyanate, cyclohexane diisocyanate, methylcyclohexane diisocyanate, isophorone diisocyanate, dicyclohexyl Methanzi Isocyanate, alicyclic diisocyanates such as isopropylidene dicyclohexyl diisocyanates. These may be used alone or in combination.
- a chain extender may be used when synthesizing the urethane resin, and the chain extender is not particularly limited as long as it has two or more active groups that react with an isocyanate group. Alternatively, a chain extender having two amino groups can be mainly used.
- chain extender having two hydroxyl groups examples include aliphatic glycols such as ethylene glycol, propylene glycol and butanediol, aromatic glycols such as xylylene glycol and bishydroxyethoxybenzene, and esters such as neopentyl glycol hydroxypivalate. And glycols such as glycols.
- chain extender having two amino groups examples include aromatic diamines such as tolylenediamine, xylylenediamine, diphenylmethanediamine, ethylenediamine, propylenediamine, hexanediamine, 2,2-dimethyl-1,3- Propanediamine, 2-methyl-1,5-pentanediamine, trimethylhexanediamine, 2-butyl-2-ethyl-1,5-pentanediamine, 1,8-octanediamine, 1,9-nonanediamine, 1,10- Aliphatic diamines such as decane diamine, 1-amino-3-aminomethyl-3,5,5-trimethylcyclohexane, dicyclohexylmethanediamine, isopropylidine cyclohexyl-4,4′-diamine, 1,4-diaminocyclohexane, 1 , 3-Bisaminomethylcyclohexane Alicyclic diamines, and the like of.
- the urethane resin can contain an aromatic compound as long as the adhesive properties are not impaired.
- the aromatic compound includes a benzene skeleton or a naphthalene skeleton in that it is difficult to be colored.
- acrylic is used to improve the coated surface, improve the visibility when various light diffusing layers and anti-sticking layers are formed on the coated surface, and improve the transparency. It is also possible to use a binder polymer other than the resin and the urethane resin in combination. If the coating layer is formed only with a polyester resin without using an acrylic resin or a urethane resin as a binder, the adhesiveness with the light diffusion layer or the anti-sticking layer may not be sufficient, so the gist of the present invention is not impaired. It is necessary to use together in a range.
- the “binder polymer” used in the present invention is a number average molecular weight (Mn) measured by gel permeation chromatography (GPC) according to a polymer compound safety evaluation flow scheme (November 1985, sponsored by the Chemical Substances Council). ) Is a polymer compound having a molecular weight of 1000 or more and having a film-forming property.
- binder polymer examples include polyester resin, polyalkylene glycol, polyalkyleneimine, methylcellulose, hydroxycellulose, starches and the like. Moreover, you may use together an acrylic resin and a urethane resin.
- a cross-linking agent can be used in the coating layer as long as the gist of the present invention is not impaired. By using a cross-linking agent, the coating layer becomes stronger, so that the heat and moisture resistance may be further improved.
- Various known resins can be used as the crosslinking agent, and examples thereof include melamine compounds, epoxy compounds, oxazoline compounds, and isocyanate compounds.
- the melamine compound is a compound having a melamine skeleton in the compound.
- an alkylolated melamine derivative a compound partially or completely etherified by reacting an alcohol with an alkylolated melamine derivative, and a mixture thereof can be used.
- alcohol used for etherification methyl alcohol, ethyl alcohol, isopropyl alcohol, n-butanol, isobutanol and the like are preferably used.
- a melamine compound either a monomer or a multimer more than a dimer may be sufficient, or a mixture thereof may be used.
- a product obtained by co-condensing urea or the like with a part of melamine can be used, and a catalyst can be used to increase the reactivity of the melamine compound.
- Examples of the epoxy compound include a compound containing an epoxy group in the molecule, a prepolymer and a cured product thereof.
- a typical example is a condensate of epichlorohydrin and bisphenol A.
- a reaction product of a low molecular polyol with epichlorohydrin gives an epoxy resin having excellent water solubility.
- the oxazoline compound is a compound having an oxazoline ring in the molecule, and includes a monomer having an oxazoline ring and a polymer synthesized using the oxazoline compound as one of raw material monomers.
- an isocyanate compound it refers to a compound having an isocyanate group in the molecule.
- hexamethylene diisocyanate, trimethylhexamethylene diisocyanate, cyclohexylene diisocyanate, xylylene diisocyanate, isophorone diisocyanate, naphthalene diisocyanate, tolylene diisocyanate these Examples include block bodies and derivatives.
- cross-linking agents may be used alone or in combination of two or more. Furthermore, when consideration is given to application to in-line coating, it is preferable to have water solubility or water dispersibility.
- inert particles may be contained, and specific examples include silica, alumina, kaolin, calcium carbonate, titanium oxide, organic particles, and the like.
- an antifoaming agent a coatability improver, a thickener, an organic lubricant, an antistatic agent, an ultraviolet absorber, an antioxidant, a foaming agent, a dye, etc. May be contained.
- the proportion of the condensed polycyclic aromatic in the compound is preferably in the range of 5 to 80% by weight. More preferably, it is in the range of 10 to 60% by weight.
- the ratio of the condensed polycyclic aromatic in the entire coating layer is preferably in the range of 1 to 70% by weight, more preferably in the range of 2 to 40% by weight, and still more preferably in the range of 4 to 25% by weight. . If it falls outside these ranges, the visibility may deteriorate due to interference unevenness after the formation of the light diffusion layer or the anti-sticking layer, and the coated surface may be deteriorated.
- the ratio of the condensed polycyclic aromatic can be determined by, for example, dissolving and extracting the coating layer with an appropriate solvent or warm water, separating by chromatography, analyzing the structure by NMR or IR, and further pyrolyzing GC-MS (gas It can obtain
- the weight ratio of the entire coating layer is usually in the range of 5 to 80%, more preferably in the range of 15 to 70%, and still more preferably. It is in the range of 25-50%. If it is less than 5%, the adhesion to the light diffusing layer or the anti-sticking layer may be poor. If it exceeds 80%, the refractive index of the coating layer cannot be increased. Visibility may not be good due to uneven interference.
- the weight ratio of the entire coating layer is usually in the range of 5 to 90%, more preferably in the range of 15 to 80%, and still more preferably. It is in the range of 25 to 70%. If it is less than 5%, the adhesion to the light diffusing layer or the anti-sticking layer may be poor. If it exceeds 90%, the visibility is not good due to interference unevenness after the formation of the light diffusing layer or the anti-sticking layer. There is.
- the component in the coating layer can be analyzed by surface analysis such as TOF-SIMS.
- a coating layer When providing a coating layer by in-line coating, apply the above-mentioned series of compounds as an aqueous solution or water dispersion on a polyester film with a coating solution adjusted to a solid content concentration of about 0.1 to 50% by weight. It is preferable to produce a laminated polyester film. Moreover, in the range which does not impair the main point of this invention, a small amount of organic solvents may be contained in the coating liquid for the purpose of improving dispersibility in water, improving film-forming properties, and the like. Only one type of organic solvent may be used, or two or more types may be used as appropriate.
- the thickness of the coating layer provided on the polyester film is usually 0.02 to 0.3 g / m 2 , more preferably 0.05 to 0.25 g / m 2 , and still more preferably.
- the range is 0.07 to 0.20 g / m 2 .
- a conventionally known coating method such as reverse gravure coating, direct gravure coating, roll coating, die coating, bar coating, curtain coating or the like can be used.
- the coating method there is an example described in “Coating Method” published by Yoji Harasaki in 1979.
- the drying and curing conditions for forming the coating layer on the polyester film are not particularly limited.
- the coating layer is provided by off-line coating, it is usually 3 to 40 at 80 to 200 ° C.
- the heat treatment should be performed for a second, preferably 100 to 180 ° C. for 3 to 40 seconds.
- the coating layer is provided by in-line coating, it is usually preferable to perform heat treatment at 70 to 280 ° C. for 3 to 200 seconds as a guide.
- polyester film constituting the laminated polyester film in the present invention may be subjected to surface treatment such as corona treatment or plasma treatment in advance.
- the coating layer in the present invention has a refractive index adjusted to suppress the occurrence of interference unevenness, and the refractive index is designed in the vicinity of the geometric mean of the polyester film of the substrate and the diffusion layer or anti-sticking layer. Is.
- the refractive index of the coating layer and the reflectance of the coating layer are closely related.
- a graph showing the wavelength on the horizontal axis and the reflectance on the vertical axis is drawn, and one minimum value of the reflectance appears in the wavelength range of 400 to 800 nm. If they appear at the same wavelength, the minimum reflectivity is high when the refractive index is high, and low when the refractive index is low.
- the reflectance of the minimum value varies depending on the wavelength range of the minimum value even if the material design of the coating layer is exactly the same. Specifically, comparing the case where the wavelength range of the minimum value exists in the short wavelength region and the case where it exists in the long wavelength region, the reflectance is lower in the case where it exists in the long wavelength region.
- the favorable reflectance means that, in the absolute reflectance, when a minimum value exists in the range of the wavelength of 350 nm or more and less than 550 nm, the value of the minimum value is preferably 3.0 to 4.5%, more preferably Is in the range of 3.3 to 4.0%, more preferably 3.4 to 3.9%.
- the minimum value is preferably Is in the range of 2.8 to 4.3%, more preferably 3.1 to 3.8%, and still more preferably 3.2 to 3.7%.
- the laminated polyester film of the present invention generally has a coating layer provided with a light diffusion layer, a sticking prevention layer and the like.
- the light diffusing layer contains particles and a binder.
- the particles to be included in the light diffusion layer may be any particles having a property of diffusing light, such as organic particles such as acrylic resin, acrylic urethane resin, urethane resin, polyester resin, and polyvinyl resin, silica, and metal oxide. And inorganic particles such as barium sulfate can be used. Of these, acrylic resins and acrylic urethane resins having good transparency are preferably used.
- the particle diameter of these particles is not particularly limited, but the average particle diameter is 1 to 50 ⁇ m, more preferably 5 to 15 ⁇ m.
- the binder contained in the light diffusing layer is used to fix particles and develop light diffusibility.
- polyester resin acrylic resin, polyurethane resin, fluororesin, silicone resin, epoxy resin, UV curable type
- resins include resins.
- a polyol compound is preferably used, and examples thereof include acrylic polyol and polyester polyol.
- a polyol compound When a polyol compound is used as a binder, it is preferable to contain isocyanate as a curing agent. By containing isocyanate, a stronger cross-linked structure can be formed, and physical properties as a light diffusion layer are improved. Further, when an ultraviolet curable resin is used as the binder, an acrylate resin is preferable, which can be used for improving the hardness of the light diffusion layer.
- the light diffusing layer may contain a surfactant, a fine inorganic filler, a plasticizer, a curing agent, an antioxidant, an ultraviolet absorber, a rust preventive agent, etc. within a range not impairing the light diffusion performance. .
- the mixing ratio of the binder and particles in the light diffusion layer can be appropriately set depending on the light diffusibility to be obtained, and is not particularly limited.
- the binder / particles are in the range of 0.1 to 50 in terms of weight ratio, More preferably, it is in the range of 0.5-20.
- a method of preparing a coating solution containing a binder and particles, coating and drying can be mentioned.
- a coating method a conventionally known coating method such as reverse gravure coating, direct gravure coating, roll coating, die coating, bar coating, curtain coating, spray coating, spin coating or the like can be used.
- the thickness of the light diffusion layer is not particularly limited, but it is in the range of 1 to 100 ⁇ m, more preferably in the range of 3 to 30 ⁇ m in consideration of light diffusibility, film strength, and the like.
- a sticking prevention layer is formed on the surface opposite to the light diffusion layer.
- the anti-sticking layer contains the same binder and particles as the light diffusion layer, and the content of the particles is not intended to be light diffusive. Therefore, a method of containing a smaller amount with a smaller particle size is generally used. It is.
- the forming method can also be formed by coating in the same manner as the light diffusion layer, and the thickness is not particularly limited, but is preferably in the range of 1 to 10 ⁇ m.
- the laminated polyester film for a light diffusing sheet of the present invention when a light diffusing layer or an anti-sticking layer is formed, there is provided a laminated polyester film that is free from interference unevenness and excellent in adhesion and reusability. And its industrial value is high.
- a black tape (vinyl tape VT-50 manufactured by Nichiban Co., Ltd.) is pasted on the measurement back side of the polyester film in advance, and a spectrophotometer (UV-spectrophotometer V-570 manufactured by JASCO Corporation) and automatic absolute reflectance measuring device AM- 500N) using a synchronous mode, an incident angle of 5 °, an N polarization, a response Fast, a data acquisition interval of 1.0 nm, a bandwidth of 10 nm, a scanning speed of 1000 m / min, and an absolute surface with a wavelength range of 300 to 800 nm. The reflectance was measured, and the wavelength (bottom wavelength) and absolute reflectance at the minimum value were evaluated.
- acrylic resin particles having an average particle diameter of 15 ⁇ m used in the coating solution for the light diffusion layer as an anti-sticking layer on the side opposite to the light diffusion layer were replaced with acrylic resin particles having an average particle diameter of 5 ⁇ m (manufactured by Sekisui Plastics MBX-5)
- a double-sided product was produced in the same manner except that a layer having a thickness of 3 g / m 2 was formed instead of 7 parts.
- a black tape (vinyl tape VT-50 manufactured by Nichiban Co., Ltd.) is attached to the light diffusion layer side of the obtained film, and interference unevenness is visually observed under a three-wavelength fluorescent lamp from the sticking prevention layer side.
- the anti-sticking layer is formed of particles and a binder in the same manner as the light diffusion layer, but generally has a smaller amount of particles and a smaller film thickness than the light diffusion layer. For this reason, the light diffusibility is lowered, and interference unevenness may be observed. Therefore, it is very important to adjust the refractive index of the coating layer.
- the peeled area was 0%, ⁇ , 0% Exceeding 5% or less, ⁇ , exceeding 5% and 20% or less, ⁇ , exceeding 20%, ⁇ .
- the anti-sticking layer has less surface irregularities, and therefore has better adhesion to the tape to be peeled, and therefore the peel area tends to be larger than the light diffusion layer.
- the film preferably has a neutral color tone
- the b * value is preferably in the range of ⁇ 4.5 to +4.5, more preferably in the range of ⁇ 3.5 to +3.5, and still more preferably ⁇ 3.
- the range is from 0.0 to +3.0.
- the case of exceeding 4.5 was rated as x. In this application, if it is 4.5 or less, it can be said that it can be used.
- the polyester used in the examples and comparative examples was prepared as follows. ⁇ Method for producing polyester (A)> Using 100 parts by weight of dimethyl terephthalate and 60 parts by weight of ethylene glycol as starting materials, adding tetrabutoxy titanate as a catalyst to the reactor, setting the reaction start temperature to 150 ° C., and gradually increasing the reaction temperature as methanol is distilled off. It was 230 degreeC after 3 hours. After 4 hours, the transesterification reaction was substantially completed, and then a polycondensation reaction was performed for 4 hours. That is, the temperature was gradually raised from 230 ° C. to 280 ° C. On the other hand, the pressure was gradually reduced from normal pressure, and finally 0.3 mmHg.
- the reaction was stopped at a time corresponding to an intrinsic viscosity of 0.63 due to a change in stirring power of the reaction vessel, and the polymer was discharged under nitrogen pressure to obtain a polyester (A) having an intrinsic viscosity of 0.63.
- the pressure was gradually reduced from normal pressure, and finally 0.3 mmHg.
- the reaction was stopped at a time corresponding to an intrinsic viscosity of 0.65 due to a change in stirring power in the reaction vessel, and the polymer was discharged under nitrogen pressure to obtain a polyester (B) having an intrinsic viscosity of 0.65.
- polyester (C) ⁇ Method for producing polyester (C)>
- 0.2 part of silica particles having an average particle diameter of 2.0 ⁇ m dispersed in ethylene glycol was added and the polycondensation reaction was stopped at a time corresponding to an intrinsic viscosity of 0.66.
- Polyester (A) was subjected to a vented twin-screw extruder and 2,2- (1,4-phenylene) bis [4H-3,1-benzoxazin-4-one] (CYTECOR manufactured by CYTEC) as an ultraviolet absorber.
- UV-3638 molecular weight 369 benzoxazinone
- UV absorbent master batch polyester (D) was prepared.
- the intrinsic viscosity of the obtained polyester (D) was 0.60.
- Examples of compounds constituting the coating layer are as follows.
- (Compound example) ⁇ Compound having condensed polycyclic aromatics>
- Example 1 A mixed raw material obtained by mixing polyesters (A), (B), and (C) at a ratio of 85%, 5%, and 10%, respectively, is used as a raw material of the outermost layer (surface layer), and polyesters (A) and (B) are each 95 %, 5% mixed raw materials were used as intermediate layer raw materials, each was supplied to two extruders, melted at 293 ° C., and then on a cooling roll set at 40 ° C. It was coextruded with a layer structure of a layer (surface layer / intermediate layer / surface layer) and cooled and solidified to obtain an unstretched sheet. Next, the film was stretched 3.4 times in the longitudinal direction at a film temperature of 85 ° C.
- Thickness having a coating layer in which the film is stretched 4.0 times at 120 ° C. in the transverse direction and heat-treated at 225 ° C. and then relaxed by 2% in the transverse direction and the coating amount (after drying) is 0.10 g / m 2.
- a polyester film having a thickness of 188 ⁇ m (surface layer: 9 ⁇ m, intermediate layer: 170 ⁇ m) was obtained.
- the absolute reflectance of the obtained polyester film was measured in the wavelength range of 300 to 800 nm, the wavelength (bottom wavelength) at the minimum value was 440 nm and the absolute reflectance was 3.8%. There was no interference unevenness after forming the anti-sticking layer, and the visibility was good. In addition, adhesion and reusability were also good.
- Table 2 The properties of this film are shown in Table 2 below.
- Example 1 In Example 1, it manufactured similarly to Example 1 except having changed the coating agent composition into the coating agent composition shown in Table 1, and obtained the polyester film.
- the finished polyester film is as shown in Table 2.
- the interference unevenness after forming the anti-sticking layer was evaluated, the visibility was good, and the adhesion and reusability were also good.
- Example 1 In Example 1, it manufactured similarly to Example 1 except having changed the coating agent composition into the coating agent composition shown in Table 1, and obtained the polyester film. When the completed laminated polyester film was evaluated, it was as shown in Table 2. The interference unevenness level was not good, the adhesion was weak, and the reusability was poor.
- the concentration of the coating solution was a 10% by weight aqueous solution.
- Example 9 In Example 1, it manufactured similarly to Example 1 except having changed a coating agent composition into the coating agent composition shown in following Table 3, and obtained the polyester film.
- the absolute reflectance of the obtained polyester film was measured in the wavelength range of 300 to 800 nm, the wavelength (bottom wavelength) at the minimum value was 430 nm, and the absolute reflectance was 3.7%. There was no interference unevenness of the anti-sticking layer, and the visibility was good. Also, the adhesion was good.
- Table 4 The properties of this film are shown in Table 4 below.
- Example 9 In Example 9, it manufactured like Example 9 except having changed a coating agent composition into the coating agent composition shown in following Table 3, and obtained the polyester film.
- the finished polyester film is as shown in Table 4 below.
- Comparative Example 4 A polyester film was obtained in the same manner as in Example 9 except that the coating agent composition was changed to the coating agent compositions shown in Tables 2 and 3 in Example 9. The finished laminated polyester film was evaluated as shown in Table 4.
- the concentration of the coating solution was a 10% by weight aqueous solution.
- Example 15 Polyesters (A), (B), and (C) are mixed at a ratio of 85%, 5%, and 10%, respectively, to form a raw material for the outermost layer (surface layer), and polyesters (A), (B), (D ) Were mixed at a ratio of 92%, 5%, and 3%, respectively, as intermediate layer raw materials, each was supplied to two extruders, melted at 293 ° C, and then cooled to 40 ° C. On the roll, it was co-extruded in a layer configuration of two types and three layers (surface layer / intermediate layer / surface layer) and cooled and solidified to obtain an unstretched sheet. Next, the film was stretched 3.4 times in the machine direction at a film temperature of 85 ° C.
- the absolute reflectance of the obtained polyester film was measured in the wavelength range of 300 to 800 nm, the wavelength (bottom wavelength) at the minimum value was 440 nm and the absolute reflectance was 3.8%. There was no interference unevenness after forming the anti-sticking layer, and the visibility was good. Also, the adhesion was good. Further, the transmittance at 380 nm was 4%, and it was confirmed that ultraviolet rays were absorbed. The properties of this film are shown in Table 5 below.
- Example 15 it manufactured similarly to Example 15 except having changed the coating composition into the coating composition shown in Table 1, and obtained the polyester film.
- the finished polyester film is as shown in Table 5.
- Example 15 is the same as Example 15 except that a mixed raw material in which polyesters (A), (B), and (D) are mixed in proportions of 91%, 5%, and 4%, respectively, is used as a raw material for the intermediate layer. To obtain a polyester film. The completed polyester film is as shown in Table 5. The transmittance at 380 nm was 1%, and it was confirmed that ultraviolet rays were absorbed.
- Example 15 is the same as Example 15 except that a mixed raw material in which polyesters (A), (B), and (D) are mixed at a ratio of 93%, 5%, and 2%, respectively, is used as an intermediate layer raw material. To obtain a polyester film. The completed polyester film was as shown in Table 5. The transmittance at 380 nm was 9%, and it was confirmed that ultraviolet rays were absorbed.
- Example 15 it manufactured similarly to Example 15 except having changed the coating composition into the coating composition shown in Table 1, and obtained the polyester film.
- the completed laminated polyester film was evaluated, it was as shown in Table 5, and the level of interference unevenness was not good or the adhesion was weak.
- Example 25 In Example 15, it manufactured like Example 15 except changing a coating agent composition into the coating agent composition shown in Table 3, and obtained the polyester film.
- the absolute reflectance of the obtained polyester film was measured in the wavelength range of 300 to 800 nm, the wavelength (bottom wavelength) at the minimum value was 430 nm, and the absolute reflectance was 3.7%. There was no interference unevenness after forming the anti-sticking layer, and the visibility was good. Also, the adhesion was good. Further, the transmittance at 380 nm was 4%, and it was confirmed that ultraviolet rays were absorbed.
- Table 6 The properties of this film are shown in Table 6 below.
- Example 25 a polyester film was obtained in the same manner as in Example 25 except that the coating composition was changed to the coating composition shown in Table 3.
- the completed polyester film is as shown in Table 6.
- Example 31 In Example 23, it manufactured similarly to Example 25 except having changed the coating agent composition into the coating agent composition shown in Table 3, and obtained the polyester film.
- the completed polyester film was as shown in Table 6.
- the transmittance at 380 nm was 1%, and it was confirmed that ultraviolet rays were absorbed.
- Example 32 In Example 24, it manufactured similarly to Example 25 except having changed the coating composition into the coating composition shown in Table 3, and obtained the polyester film. The completed polyester film was as shown in Table 6. The transmittance at 380 nm was 9%, and it was confirmed that ultraviolet rays were absorbed.
- Example 25 a polyester film was obtained in the same manner as in Example 25 except that the coating composition was changed to the coating composition shown in Table 3. When the completed laminated polyester film was evaluated, it was as shown in Table 6, and the level of interference unevenness was not good or the adhesion was weak.
- the film of the present invention can be suitably used for an application that needs to reduce interference unevenness due to light reflection, such as a backlight unit of a liquid crystal display.
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Manufacturing & Machinery (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Laminated Bodies (AREA)
Abstract
Description
本発明における積層ポリエステルフィルムを構成するポリエステルフィルムは単層構成であっても多層構成であってもよく、2層、3層構成以外にも本発明の要旨を越えない限り、4層またはそれ以上の多層であってもよく、特に限定されるものではない。
ポリエステルに非相溶な他のポリマー成分および顔料を除去したポリエステル1gを精秤し、フェノール/テトラクロロエタン=50/50(重量比)の混合溶媒100mlを加えて溶解させ、30℃で測定した。
遠心沈降式粒度分布測定装置(株式会社島津製作所社製SA-CP3型)を使用して測定した等価球形分布における積算(重量基準)50%の値を平均粒径とした。
あらかじめ、ポリエステルフィルムの測定裏面に黒テープ(ニチバン株式会社製ビニールテープVT―50)を貼り、分光光度計(日本分光株式会社製 紫外可視分光光度計 V-570 および自動絶対反射率測定装置 AM-500N)を使用して同期モード、入射角5°、N偏光、レスポンス Fast、データ取区間隔1.0nm、バンド幅10nm、走査速度1000m/minで、塗布層表面を波長範囲300~800nmの絶対反射率を測定し、その極小値における波長(ボトム波長)と絶対反射率を評価した。
光拡散層用塗布液として、アクリルポリオール(大日本インキ化学工業製 アクリディック A-801)60部、ポリイソシアネート(三井化学ポリウレタン製、タケネートD110N)15部、平均粒径15μmのアクリル樹脂粒子(積水化成品工業製 MBX-15)25部、トルエン 100部、メチルエチルケトン 100部を調製し、塗布・加熱硬化させることにより、厚さ15g/m2光拡散層を形成した。また、光拡散層とは反対面側にスティッキング防止層として、上記光拡散層用塗布液に用いた平均粒径15μmのアクリル樹脂粒子を、平均粒径5μmのアクリル樹脂粒子(積水化成品工業製 MBX-5)7部に変えて、厚さ3g/m2の層を形成した以外は同様な方法で、両面加工品を作成した。得られたフィルムに対して、光拡散層側に黒テープ(ニチバン株式会社製ビニールテープVT―50)を貼り付け、スティッキング防止層側から3波長光域型蛍光灯下で目視にて、干渉ムラを観察し、干渉ムラが確認できないものを◎、色が不明瞭な干渉ムラが確認されるものを○、色を判別できる干渉ムラが確認されるものを△、色を判別できる強い干渉ムラが確認され、白色蛍光灯下においても干渉ムラ確認されるものを×として評価した。通常の光拡散層の場合は、上記の光拡散層と同様に光拡散性が高いため、ほとんど干渉ムラは観察されない。ところが、光拡散性が低い光拡散層の場合は、干渉ムラが観察される可能性があるため、塗布層の屈折率調製がより重要となる。一方、スティッキング防止層は、光拡散層と同様、粒子とバインダーにより形成されているが、光拡散層に比べて、粒子の配合量が少なく、かつ膜厚が薄いのが一般的である。そのため、光拡散性が低くなり、干渉ムラが観察される場合があるので、塗布層の屈折率調製が非常に重要となる。
干渉ムラの評価方法と同様な方法により、積層ポリエステルフィルムの片面に光拡散層、他方面にスティッキング防止層を形成した。その後、恒温恒湿槽中で、80℃、85%RHの環境下で50時間放置した後、光拡散層、およびスティッキング防止層各々に対して、18mm幅のテープ(ニチバン株式会社製セロテープ(登録商標)CT-18)を貼り付け、180度の剥離角度で急激にはがした後、剥離面を観察し、より剥離面積が大きい方に対して、剥離面積が0%ならば◎、0%を超え5%以下なら○、5%を超え20%以下ならば△、20%を超えるならば×とした。通常は、スティッキング防止層の方が、表面凹凸が少ないため、剥離するテープとの接着が良いので、光拡散層に比べて剥離面積が大きくなる傾向にある。
フィルム小片をエポキシ樹脂にて固定成形した後、ミクロトームで切断し、フィルムの断面を透過型電子顕微鏡写真にて観察した。その断面のうちフィルム表面とほぼ平行に2本、明暗によって界面が観察される。その2本の界面とフィルム表面までの距離を10枚の写真から測定し、平均値を層厚さとした。
ポリエステルフィルムの中間層の原料として、実施例で用いたポリエステル(A)、(B)、再利用するポリマーとして各実施例で得られたポリマーをそれぞれ66%、4%、30%の割合で混合したものを用いたこと、および塗布層を設けなかったこと以外は、実施例1と同様にして厚さ188μmのポリエステルフィルムを得た。でき上がったポリエステルフィルムの反射法5枚によるb*値を分光測色計(コニカミノルタセンシング株式会社製 CM-3700d)を使用して測定した。フィルムとしてはニュートラルな色調であることが好ましく、b*値としては、好ましくは-4.5~+4.5の範囲、より好ましくは-3.5~+3.5の範囲、さらに好ましくは-3.0~+3.0の範囲である。b*値の絶対値で、3.0以下の範囲であれば◎、3.0を超え3.5以下の範囲であれば○、3.5を超え4.5以下の範囲であれば△、4.5を超える場合を×とした。なお、本用途では、4.5以下であれば使用可能レベルといえる。
分光光度計(株式会社島津製作所社製UV-3100PC型)により、スキャン速度を低速、サンプリングピッチを2nm、波長300~700nm領域で連続的に光線透過率を測定し、380nm波長での光線透過率を検出した。
<ポリエステル(A)の製造方法>
テレフタル酸ジメチル100重量部とエチレングリコール60重量部とを出発原料とし、触媒としてテトラブトキシチタネートを加えて反応器にとり、反応開始温度を150℃とし、メタノールの留去とともに徐々に反応温度を上昇させ、3時間後に230℃とした。4時間後、実質的にエステル交換反応を終了させた後、4時間重縮合反応を行った。
すなわち、温度を230℃から徐々に昇温し280℃とした。一方、圧力は常圧より徐々に減じ、最終的には0.3mmHgとした。反応開始後、反応槽の攪拌動力の変化により、極限粘度0.63に相当する時点で反応を停止し、窒素加圧下ポリマーを吐出させ、極限粘度0.63のポリエステル(A)を得た。
テレフタル酸ジメチル100重量部とエチレングリコール60重量部とを出発原料とし、触媒として酢酸マグネシウム・四水塩を加えて反応器にとり、反応開始温度を150℃とし、メタノールの留去とともに徐々に反応温度を上昇させ、3時間後に230℃とした。4時間後、実質的にエステル交換反応を終了させた。この反応混合物を重縮合槽に移し、正リン酸を添加した後、二酸化ゲルマニウム加えて、4時間重縮合反応を行った。すなわち、温度を230℃から徐々に昇温し280℃とした。一方、圧力は常圧より徐々に減じ、最終的には0.3mmHgとした。反応開始後、反応槽の攪拌動力の変化により、極限粘度0.65に相当する時点で反応を停止し、窒素加圧下ポリマーを吐出させ、極限粘度0.65のポリエステル(B)を得た。
ポリエステル(A)の製造方法において、エチレングリコールに分散させた平均粒子径2.0μmのシリカ粒子を0.2部を加えて、極限粘度0.66に相当する時点で重縮合反応を停止した以外は、ポリエステル(A)の製造方法と同様の方法を用いて、極限粘度0.66のポリエステル(C)を得た。
ポリエステル(A)をベント付き二軸押出機に供して、紫外線吸収剤として2,2-(1,4-フェニレン)ビス[4H-3,1-ベンゾオキサジン-4-オン](CYTEC社製 CYASORB UV-3638 分子量369 ベンゾオキサジノン系)を10重量%濃度となるように供給して溶融混練りしてチップ化を行い、紫外線吸収剤マスターバッチポリエステル(D)を作成した。得られたポリエステル(D)の極限粘度は、0.60であった。
(化合物例)
<縮合多環式芳香族を有する化合物>
(I)下記組成で共重合したポリエステル樹脂の水分散体:
モノマー組成:(酸成分)2,6-ナフタレンジカルボン酸/イソフタル酸/5-ソジウムスルホイソフタル酸//(ジオール成分)エチレングリコール/ジエチレングリコール=84/13/3//80/20(mol%)
<アクリル樹脂>
(IIA)下記組成で重合したアクリル樹脂の水分散体:
エチルアクリレート/n-ブチルアクリレート/メチルメタクリレート/N-メチロールアクリルアミド/アクリル酸=65/21/10/2/2(重量%)の乳化重合体(乳化剤:アニオン系界面活性剤)
<アクリル樹脂>
(IIB)下記組成で重合したアクリル樹脂の水分散体:
エチルアクリレート/メチルメタクリレート/2-ヒドロキシエチルメタクリレート/N-メチロールアクリルアミド/アクリル酸=65/28/3/2/2(重量%)の乳化重合体(乳化剤:アニオン系界面活性剤)
<ウレタン樹脂>
(IIC)DMSネオレジン製「ネオレッツ R-960」
<ウレタン樹脂>
(IID)DIC製「ハイドラン AP-40」
<ポリエステル樹脂>
(III)下記組成で共重合したポリエステル樹脂の水分散体:
モノマー組成:(酸成分)テレフタル酸/イソフタル酸/5-ソジウムスルホイソフタル酸//(ジオール成分)エチレングリコール/1,4-ブタンジオール/ジエチレングリコール=56/40/4//70/20/10(mol%)
<エポキシ化合物>
(IVA)エチレングリコールジグリシジルエーテル
<メラミン化合物>
(IVB)ヘキサメトキシメチルメラミン
<粒子>
(V)平均粒径65nmのシリカゾル
<金属キレート化合物>
(VI)チタントリエタノールアミネート
ポリエステル(A)、(B)、(C)をそれぞれ85%、5%、10%の割合で混合した混合原料を最外層(表層)の原料とし、ポリエステル(A)、(B)をそれぞれ95%、5%の割合で混合した混合原料を中間層の原料として、2台の押出機に各々を供給し、各々293℃で溶融した後、40℃に設定した冷却ロール上に、2種3層(表層/中間層/表層)の層構成で共押出し冷却固化させて未延伸シートを得た。次いで、ロール周速差を利用してフィルム温度85℃で縦方向に3.4倍延伸した後、この縦延伸フィルムの両面に、下記表1に示す塗布液1を塗布し、テンターに導き、横方向に120℃で4.0倍延伸し、225℃で熱処理を行った後、横方向に2%弛緩し、塗工量(乾燥後)が0.10g/m2の塗布層を有する厚さ188μm(表層9μm、中間層170μm)のポリエステルフィルムを得た。
実施例1において、塗布剤組成を表1に示す塗布剤組成に変更する以外は実施例1と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表2に示すとおりであり、スティッキング防止層を形成後の干渉ムラを評価したところ、視認性は良好であり、また、密着性や再利用性も良好であった。
実施例1において、塗布剤組成を表1に示す塗布剤組成に変更する以外は実施例1と同様にして製造し、ポリエステルフィルムを得た。でき上がった積層ポリエステルフィルムを評価したところ、表2に示すとおりであり、干渉ムラのレベルが良くなかったり、密着性が弱かったり、再利用性が悪いものであった。
実施例1において、塗布剤組成を下記表3に示す塗布剤組成に変更する以外は実施例1と同様にして製造し、ポリエステルフィルムを得た。得られたポリエステルフィルムの絶対反射率を波長範囲300~800nmで測定したところ、極小値における波長(ボトム波長)は430nmでその絶対反射率は3.7%であった。スティッキング防止層の干渉ムラはなく、視認性は良好であった。また、密着性も良好であった。このフィルムの特性を下記表4に示す。
実施例9において、塗布剤組成を下記表3に示す塗布剤組成に変更する以外は実施例9と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは下記表4に示すとおりであり、スティッキング防止層を形成後の干渉ムラを評価したところ、視認性は良好であり、また、密着性も良好であった。
実施例9において、塗布剤組成を表2および3に示す塗布剤組成に変更する以外は実施例9と同様にして製造し、ポリエステルフィルムを得た。でき上がった積層ポリエステルフィルムを評価したところ、表4に示すとおりであった。
ポリエステル(A)、(B)、(C)をそれぞれ85%、5%、10%の割合で混合した混合原料を最外層(表層)の原料とし、ポリエステル(A)、(B)、(D)をそれぞれ92%、5%、3%の割合で混合した混合原料を中間層の原料として、2台の押出機に各々を供給し、各々293℃で溶融した後、40℃に設定した冷却ロール上に、2種3層(表層/中間層/表層)の層構成で共押出し冷却固化させて未延伸シートを得た。次いで、ロール周速差を利用してフィルム温度85℃で縦方向に3.4倍延伸した後、この縦延伸フィルムの両面に、表1に示す塗布液1を塗布し、テンターに導き、横方向に120℃で4.0倍延伸し、225℃で熱処理を行った後、横方向に2%弛緩し、塗工量(乾燥後)が0.10g/m2の塗布層を有する厚さ188μm(表層9μm、中間層170μm)のポリエステルフィルムを得た。
実施例15において、塗布剤組成を表1に示す塗布剤組成に変更する以外は実施例15と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表5に示すとおりであり、スティッキング防止層を形成後の干渉ムラを評価したところ、視認性は良好であり、また、密着性や紫外線吸収能も良好であった。
実施例15において、ポリエステル(A)、(B)、(D)をそれぞれ91%、5%、4%の割合で混合した混合原料を中間層の原料として使用する以外は実施例15と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表5に示すとおりであり、380nmにおける透過率は1%であり、紫外線を吸収していることが確認できた。
実施例15において、ポリエステル(A)、(B)、(D)をそれぞれ93%、5%、2%の割合で混合した混合原料を中間層の原料として使用する以外は実施例15と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表5に示すとおりであり、380nmにおける透過率は9%であり、紫外線を吸収していることが確認できた。
実施例15において、塗布剤組成を表1に示す塗布剤組成に変更する以外は実施例15と同様にして製造し、ポリエステルフィルムを得た。でき上がった積層ポリエステルフィルムを評価したところ、表5に示すとおりであり、干渉ムラのレベルが良くなかったり、密着性が弱かったりするものであった。
実施例15において、塗布剤組成を表3に示す塗布剤組成に変更する以外は実施例15と同様にして製造し、ポリエステルフィルムを得た。得られたポリエステルフィルムの絶対反射率を波長範囲300~800nmで測定したところ、極小値における波長(ボトム波長)は430nmでその絶対反射率は3.7%であった。スティッキング防止層を形成後の干渉ムラはなく、視認性は良好であった。また、密着性も良好であった。さらに、380nmにおける透過率は4%であり、紫外線を吸収していることが確認できた。このフィルムの特性を下記表6に示す。
実施例25において、塗布剤組成を表3に示す塗布剤組成に変更する以外は実施例25と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表6に示すとおりであり、スティッキング防止層を形成後の干渉ムラを評価したところ、視認性は良好であり、また、密着性や紫外線吸収能も良好であった。
実施例23において、塗布剤組成を表3に示す塗布剤組成に変更する以外は実施例25と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表6に示すとおりであり、380nmにおける透過率は1%であり、紫外線を吸収していることが確認できた。
実施例24において、塗布剤組成を表3に示す塗布剤組成に変更する以外は実施例25と同様にして製造し、ポリエステルフィルムを得た。でき上がったポリエステルフィルムは表6に示すとおりであり、380nmにおける透過率は9%であり、紫外線を吸収していることが確認できた。
実施例25において、塗布剤組成を表3に示す塗布剤組成に変更する以外は実施例25と同様にして製造し、ポリエステルフィルムを得た。でき上がった積層ポリエステルフィルムを評価したところ、表6に示すとおりであり、干渉ムラのレベルが良くなかったり、密着性が弱かったりするものであった。
Claims (4)
- ポリエステルフィルムの両面に、縮合多環式芳香族を有する化合物と、ウレタン樹脂またはアクリル樹脂とを含有する塗布層を有することを特徴とする積層ポリエステルフィルム。
- ポリエステルフィルムが紫外線吸収剤を含有する請求項1記載の積層ポリエステルフィルム。
- 紫外線吸収剤がベンゾオキサジノン系である請求項2記載の積層ポリエステルフィルム。
- 請求項1~3のいずれかの積層ポリエステルフィルムからなる光拡散シート用積層ポリエステルフィルム。
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CN200980133216.2A CN102131642B (zh) | 2008-09-08 | 2009-09-07 | 叠层聚酯膜 |
EP09811303.8A EP2325006B1 (en) | 2008-09-08 | 2009-09-07 | Multilayer polyester film |
US13/061,309 US20110189489A1 (en) | 2008-09-08 | 2009-09-07 | Laminated polyester film |
Applications Claiming Priority (8)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2008229916A JP5174592B2 (ja) | 2008-09-08 | 2008-09-08 | 光拡散シート用積層ポリエステルフィルム |
JP2008229909A JP5174591B2 (ja) | 2008-09-08 | 2008-09-08 | 光拡散シート用積層ポリエステルフィルム |
JP2008-229909 | 2008-09-08 | ||
JP2008-229916 | 2008-09-08 | ||
JP2009104668A JP5174734B2 (ja) | 2009-04-23 | 2009-04-23 | 積層ポリエステルフィルム |
JP2009104669A JP5476031B2 (ja) | 2009-04-23 | 2009-04-23 | 積層ポリエステルフィルム |
JP2009-104669 | 2009-04-23 | ||
JP2009-104668 | 2009-04-23 |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2010026773A1 true WO2010026773A1 (ja) | 2010-03-11 |
Family
ID=41796952
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2009/004404 WO2010026773A1 (ja) | 2008-09-08 | 2009-09-07 | 積層ポリエステルフィルム |
Country Status (5)
Country | Link |
---|---|
US (1) | US20110189489A1 (ja) |
EP (1) | EP2325006B1 (ja) |
KR (1) | KR20110063429A (ja) |
CN (1) | CN102131642B (ja) |
WO (1) | WO2010026773A1 (ja) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011132495A1 (ja) * | 2010-04-19 | 2011-10-27 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP2011224849A (ja) * | 2010-04-19 | 2011-11-10 | Mitsubishi Plastics Inc | 積層ポリエステルフィルム |
JP2011224852A (ja) * | 2010-04-19 | 2011-11-10 | Mitsubishi Plastics Inc | 積層ポリエステルフィルム |
JP2013018281A (ja) * | 2011-03-05 | 2013-01-31 | Mitsubishi Plastics Inc | 二軸配向ポリエステルフィルム |
Families Citing this family (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2010122949A1 (ja) * | 2009-04-22 | 2010-10-28 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP5271204B2 (ja) * | 2009-05-25 | 2013-08-21 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
CN102905898A (zh) * | 2010-05-29 | 2013-01-30 | 三菱树脂株式会社 | 叠层聚酯膜 |
JP2011245809A (ja) * | 2010-05-29 | 2011-12-08 | Mitsubishi Plastics Inc | 積層ポリエステルフィルム |
WO2013058315A1 (ja) * | 2011-10-22 | 2013-04-25 | 三菱樹脂株式会社 | 塗布フィルム |
KR101217592B1 (ko) * | 2011-11-16 | 2013-01-02 | 김종율 | 광확산판 및 그 제조 방법 |
JP5934533B2 (ja) * | 2012-03-23 | 2016-06-15 | 富士フイルム株式会社 | 複層フィルム及び光学シート |
CN104245806B (zh) * | 2012-08-10 | 2016-08-17 | 东丽株式会社 | 层合聚酯膜 |
GB201409063D0 (en) * | 2014-05-21 | 2014-07-02 | Dupont Teijin Films Us Ltd | Coated polyester films |
CN111993739B (zh) * | 2019-05-27 | 2023-10-03 | 宁波长阳科技股份有限公司 | 一种多层共挤光学用透明聚酯薄膜及其制备方法 |
TWI750810B (zh) * | 2020-09-16 | 2021-12-21 | 南亞塑膠工業股份有限公司 | 聚酯薄膜及塗液 |
CN114578465B (zh) * | 2022-04-08 | 2022-08-26 | 绍兴翔宇绿色包装有限公司 | 一种pet基扩散膜及其制备方法 |
Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS595216B2 (ja) | 1979-01-25 | 1984-02-03 | ダイアホイル株式会社 | ポリエステルフイルム |
JPS59217755A (ja) | 1983-04-16 | 1984-12-07 | ヘキスト・アクチエンゲゼルシヤフト | ポリエステル原料及びフイルム |
JP2000089007A (ja) | 1998-09-17 | 2000-03-31 | Keiwa Inc | 光拡散シート及びこれを用いたバックライトユニット |
JP2002174704A (ja) | 2000-12-06 | 2002-06-21 | Fuji Photo Film Co Ltd | 光拡散フィルムの製造方法 |
JP2003302629A (ja) | 2002-04-08 | 2003-10-24 | Daicel Chem Ind Ltd | 光拡散フィルム |
JP2004004598A (ja) | 2002-03-26 | 2004-01-08 | Keiwa Inc | 光拡散シート及びこれを用いたバックライトユニット |
JP2005037591A (ja) | 2003-07-18 | 2005-02-10 | Idemitsu Petrochem Co Ltd | 光反射シート及びその成形品 |
JP2006175628A (ja) | 2004-12-21 | 2006-07-06 | Mitsubishi Polyester Film Copp | 反射防止フィルム用ポリエステルフィルムおよび反射防止フィルム |
JP2006206771A (ja) * | 2005-01-28 | 2006-08-10 | Toyobo Co Ltd | 光学用易接着性ポリエステルフィルム及び光学用積層ポリエステルフィルム |
JP2006208993A (ja) | 2005-01-31 | 2006-08-10 | Toyobo Co Ltd | 光拡散性フィルム |
JP2007181994A (ja) | 2006-01-09 | 2007-07-19 | Mitsubishi Polyester Film Copp | 積層ポリエステルフィルム |
JP2007216528A (ja) * | 2006-02-17 | 2007-08-30 | Mitsubishi Polyester Film Copp | 光学用積層ポリエステルフィルム |
JP2007286166A (ja) | 2006-04-13 | 2007-11-01 | Dainippon Ink & Chem Inc | 光拡散フィルム |
Family Cites Families (23)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6251505B1 (en) * | 1999-04-01 | 2001-06-26 | E. I. Du Pont De Nemours And Company | Backlit display composite film |
EP1178075B1 (en) * | 2000-02-10 | 2006-09-20 | Teijin Limited | Polyester film composite, light diffuser plate, and utilization thereof |
DE10019199C2 (de) * | 2000-04-17 | 2003-07-17 | Webasto Vehicle Sys Int Gmbh | Fahrzeug-Karosserieteil in Sandwich-Bauweise |
WO2001096451A1 (fr) * | 2000-06-15 | 2001-12-20 | Teijin Limited | Film polyester oriente bi-axialement pour plaque de diffuseur de lumiere et plaque de diffuseur de lumiere |
US6926945B2 (en) * | 2001-08-07 | 2005-08-09 | Teijin Dupont Films Japan Limited | Biaxially oriented layered polyester film and film with hard coat layer |
KR100467822B1 (ko) * | 2002-02-15 | 2005-01-24 | 주식회사 엘지화학 | 눈부심 방지 코팅 조성물 |
JP2004010875A (ja) * | 2002-06-12 | 2004-01-15 | Mitsubishi Polyester Film Copp | ディスプレイ用ポリエステルフィルム |
TWI295303B (en) * | 2003-08-21 | 2008-04-01 | Toyo Boseki | Optical-use adhesive polyester film and optical-use laminatede film |
JP4597127B2 (ja) * | 2004-05-28 | 2010-12-15 | 帝人デュポンフィルム株式会社 | 積層ポリエステルフィルムおよびその製造法 |
JP2006169467A (ja) * | 2004-12-20 | 2006-06-29 | Mitsubishi Polyester Film Copp | 光学用ポリエステルフィルム |
US7390099B2 (en) * | 2004-12-22 | 2008-06-24 | Nitto Denko Corporation | Hard-coated antiglare film and method of manufacturing the same |
US20060270806A1 (en) * | 2005-05-26 | 2006-11-30 | Hale Wesley R | Miscible high Tg polyester/polymer blend compositions and films formed therefrom |
JP5210858B2 (ja) * | 2006-03-17 | 2013-06-12 | 株式会社きもと | ポリエステル系フィルム用バインダー組成物及びこれを用いた光学フィルム |
EP2335924B1 (en) * | 2008-10-06 | 2014-02-12 | Mitsubishi Plastics, Inc. | Multilayer polyester film |
JP5467752B2 (ja) * | 2008-10-06 | 2014-04-09 | 三菱樹脂株式会社 | 二軸延伸ポリエステルフィルム |
WO2010122949A1 (ja) * | 2009-04-22 | 2010-10-28 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP5271204B2 (ja) * | 2009-05-25 | 2013-08-21 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
KR101767912B1 (ko) * | 2009-06-12 | 2017-08-14 | 미쯔비시 케미컬 주식회사 | 적층 폴리에스테르 필름 |
WO2011001971A1 (ja) * | 2009-07-01 | 2011-01-06 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP5349172B2 (ja) * | 2009-07-01 | 2013-11-20 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP5441583B2 (ja) * | 2009-09-18 | 2014-03-12 | 三菱樹脂株式会社 | 両面積層ポリエステルフィルム |
KR20160091451A (ko) * | 2009-09-23 | 2016-08-02 | 미쓰비시 쥬시 가부시끼가이샤 | 적층 폴리에스테르 필름 |
JP5553627B2 (ja) * | 2010-02-07 | 2014-07-16 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
-
2009
- 2009-09-07 CN CN200980133216.2A patent/CN102131642B/zh active Active
- 2009-09-07 WO PCT/JP2009/004404 patent/WO2010026773A1/ja active Application Filing
- 2009-09-07 EP EP09811303.8A patent/EP2325006B1/en active Active
- 2009-09-07 KR KR1020117002616A patent/KR20110063429A/ko not_active Application Discontinuation
- 2009-09-07 US US13/061,309 patent/US20110189489A1/en not_active Abandoned
Patent Citations (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS595216B2 (ja) | 1979-01-25 | 1984-02-03 | ダイアホイル株式会社 | ポリエステルフイルム |
JPS59217755A (ja) | 1983-04-16 | 1984-12-07 | ヘキスト・アクチエンゲゼルシヤフト | ポリエステル原料及びフイルム |
JP2000089007A (ja) | 1998-09-17 | 2000-03-31 | Keiwa Inc | 光拡散シート及びこれを用いたバックライトユニット |
JP2002174704A (ja) | 2000-12-06 | 2002-06-21 | Fuji Photo Film Co Ltd | 光拡散フィルムの製造方法 |
JP2004004598A (ja) | 2002-03-26 | 2004-01-08 | Keiwa Inc | 光拡散シート及びこれを用いたバックライトユニット |
JP2003302629A (ja) | 2002-04-08 | 2003-10-24 | Daicel Chem Ind Ltd | 光拡散フィルム |
JP2005037591A (ja) | 2003-07-18 | 2005-02-10 | Idemitsu Petrochem Co Ltd | 光反射シート及びその成形品 |
JP2006175628A (ja) | 2004-12-21 | 2006-07-06 | Mitsubishi Polyester Film Copp | 反射防止フィルム用ポリエステルフィルムおよび反射防止フィルム |
JP2006206771A (ja) * | 2005-01-28 | 2006-08-10 | Toyobo Co Ltd | 光学用易接着性ポリエステルフィルム及び光学用積層ポリエステルフィルム |
JP2006208993A (ja) | 2005-01-31 | 2006-08-10 | Toyobo Co Ltd | 光拡散性フィルム |
JP2007181994A (ja) | 2006-01-09 | 2007-07-19 | Mitsubishi Polyester Film Copp | 積層ポリエステルフィルム |
JP2007216528A (ja) * | 2006-02-17 | 2007-08-30 | Mitsubishi Polyester Film Copp | 光学用積層ポリエステルフィルム |
JP2007286166A (ja) | 2006-04-13 | 2007-11-01 | Dainippon Ink & Chem Inc | 光拡散フィルム |
Non-Patent Citations (3)
Title |
---|
COUNCIL OF CHEMICAL SUBSTANCES, 1997 |
See also references of EP2325006A4 |
YUJI HARAZAKI: "Coating Methods", 1979, MAKI-SHOTEN |
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2011132495A1 (ja) * | 2010-04-19 | 2011-10-27 | 三菱樹脂株式会社 | 積層ポリエステルフィルム |
JP2011224849A (ja) * | 2010-04-19 | 2011-11-10 | Mitsubishi Plastics Inc | 積層ポリエステルフィルム |
JP2011224852A (ja) * | 2010-04-19 | 2011-11-10 | Mitsubishi Plastics Inc | 積層ポリエステルフィルム |
JP2013018281A (ja) * | 2011-03-05 | 2013-01-31 | Mitsubishi Plastics Inc | 二軸配向ポリエステルフィルム |
WO2013047370A1 (ja) * | 2011-10-01 | 2013-04-04 | 三菱樹脂株式会社 | 二軸配向ポリエステルフィルム |
Also Published As
Publication number | Publication date |
---|---|
KR20110063429A (ko) | 2011-06-10 |
US20110189489A1 (en) | 2011-08-04 |
CN102131642B (zh) | 2016-06-08 |
CN102131642A (zh) | 2011-07-20 |
EP2325006A1 (en) | 2011-05-25 |
EP2325006A4 (en) | 2013-08-28 |
EP2325006B1 (en) | 2015-03-25 |
Similar Documents
Publication | Publication Date | Title |
---|---|---|
JP4916339B2 (ja) | 反射防止フィルム用積層ポリエステルフィルム | |
WO2010026773A1 (ja) | 積層ポリエステルフィルム | |
JP5009648B2 (ja) | 反射防止フィルム用積層ポリエステルフィルム | |
JP5174606B2 (ja) | 積層ポリエステルフィルム | |
JP5005927B2 (ja) | 光学用積層ポリエステルフィルム | |
WO2010122949A1 (ja) | 積層ポリエステルフィルム | |
JP2011088429A (ja) | 積層ポリエステルフィルム | |
JP5140212B2 (ja) | 光学用積層ポリエステルフィルム | |
JP5281344B2 (ja) | 光拡散シート用積層ポリエステルフィルム | |
JP2010253720A (ja) | 積層ポリエステルフィルム | |
JP5174592B2 (ja) | 光拡散シート用積層ポリエステルフィルム | |
JP5174734B2 (ja) | 積層ポリエステルフィルム | |
JP5476031B2 (ja) | 積層ポリエステルフィルム | |
JP5174591B2 (ja) | 光拡散シート用積層ポリエステルフィルム | |
JP4758738B2 (ja) | 光学用積層ポリエステルフィルム | |
JP5385581B2 (ja) | 積層ポリエステルフィルム | |
JP5366414B2 (ja) | 積層ポリエステルフィルム | |
JP5608005B2 (ja) | 積層ポリエステルフィルム | |
JP5455315B2 (ja) | 積層ポリエステルフィルム | |
JP2015166193A (ja) | 積層ポリエステルフィルム | |
JP2015214158A (ja) | 積層ポリエステルフィルム | |
JP2008064882A (ja) | 反射防止フィルム用積層ポリエステルフィルム | |
JP5819465B2 (ja) | 積層ポリエステルフィルム | |
JP2009208338A (ja) | 積層ポリエステルフィルム | |
JP2018165827A (ja) | 偏光板 |
Legal Events
Date | Code | Title | Description |
---|---|---|---|
WWE | Wipo information: entry into national phase |
Ref document number: 200980133216.2 Country of ref document: CN |
|
121 | Ep: the epo has been informed by wipo that ep was designated in this application |
Ref document number: 09811303 Country of ref document: EP Kind code of ref document: A1 |
|
ENP | Entry into the national phase |
Ref document number: 20117002616 Country of ref document: KR Kind code of ref document: A |
|
WWE | Wipo information: entry into national phase |
Ref document number: 2009811303 Country of ref document: EP |
|
NENP | Non-entry into the national phase |
Ref country code: DE |
|
WWE | Wipo information: entry into national phase |
Ref document number: 13061309 Country of ref document: US |