WO2016010134A1 - Film polyester à orientation uniaxiale ainsi que procédé de fabrication de celui-ci, film de revêtement dur, film de détection pour panneau tactile, film anti-diffusion, film anti-réflexion et panneau tactile - Google Patents

Film polyester à orientation uniaxiale ainsi que procédé de fabrication de celui-ci, film de revêtement dur, film de détection pour panneau tactile, film anti-diffusion, film anti-réflexion et panneau tactile Download PDF

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Publication number
WO2016010134A1
WO2016010134A1 PCT/JP2015/070495 JP2015070495W WO2016010134A1 WO 2016010134 A1 WO2016010134 A1 WO 2016010134A1 JP 2015070495 W JP2015070495 W JP 2015070495W WO 2016010134 A1 WO2016010134 A1 WO 2016010134A1
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WO
WIPO (PCT)
Prior art keywords
film
polyester film
oriented polyester
uniaxially oriented
stretching
Prior art date
Application number
PCT/JP2015/070495
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English (en)
Japanese (ja)
Inventor
真一 中居
宮宅　一仁
Original Assignee
富士フイルム株式会社
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Filing date
Publication date
Application filed by 富士フイルム株式会社 filed Critical 富士フイルム株式会社
Priority to JP2016534499A priority Critical patent/JP6314228B2/ja
Priority to CN201580037741.XA priority patent/CN106488839B/zh
Publication of WO2016010134A1 publication Critical patent/WO2016010134A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C55/00—Shaping by stretching, e.g. drawing through a die; Apparatus therefor
    • B29C55/02—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets
    • B29C55/04—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique
    • B29C55/08—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets uniaxial, e.g. oblique transverse to the direction of feed
    • 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
    • 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
    • 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
    • G02B5/30—Polarising elements

Definitions

  • the occurrence of rainbow unevenness can be suppressed, and problems such as wrinkles and breakage in the processing steps of various films used for touch panels can be eliminated, especially for use as a base material for various films for touch panels.
  • a particularly suitable thickness of the uniaxially oriented polyester film, hard coat film, sensor film for touch panel, anti-scattering film, antireflection film, touch panel and uniaxially oriented polyester film can be provided.
  • a polyester film is normally obtained by conveying and extending
  • the conveyance direction of the film is also referred to as MD (Machine Direction) direction.
  • the MD direction of the film is also referred to as the longitudinal direction of the film.
  • the film width direction is a direction orthogonal to the longitudinal direction.
  • the film width direction is also called a TD (Transverse Direction) direction in a film manufactured while transporting the film.
  • the thickness t of the uniaxially oriented polyester film is obtained by, for example, sampling 50 points at equal intervals over 0.5 m in the longitudinally stretched direction (longitudinal direction) using a contact-type film thickness meter, and further in the film width direction (longitudinal direction). After sampling 50 points at equal intervals (50 equal parts in the width direction) over the entire width of the film in the direction perpendicular to each other, the thicknesses of these 100 points were measured. The average thickness of these 100 points was determined and used as the thickness of the uniaxially oriented polyester film.
  • Re, Rth, and Nz at a wavelength ⁇ nm can be measured as follows. Using two polarizing plates, the orientation axis direction of the polyester film was determined, and a 4 cm ⁇ 2 cm rectangle was cut out so that the orientation axis directions were perpendicular to each other, and used as a measurement sample. For this sample, the biaxial refractive index (Nx, Ny) perpendicular to each other and the refractive index (Nz) in the thickness direction were determined by an Abbe refractometer (Atago Co., Ltd., NAR-4T, measurement wavelength 589 nm).
  • the ratio ETD / EMD of the elastic modulus in the TD direction to the elastic modulus in the MD direction satisfies the following formula 5.
  • EMD represents the elastic modulus in the longitudinal direction of the film, the unit is MPa, ETD represents the elastic modulus in the film width direction, and its unit is MPa.
  • the ratio ETD / EMD of the elastic modulus in the TD direction to the elastic modulus in the MD direction is more preferably 2.1 or more and 2.9 or less, and further preferably 2.2 or more and 2.8 or less.
  • the ratio ETD / EMD of the elastic modulus in the TD direction to the elastic modulus in the MD direction exceeds 3, wrinkles in the vertical direction are likely to occur.
  • the ratio ETD / EMD of the elastic modulus in the TD direction to the elastic modulus in the MD direction is less than 2, it becomes difficult to achieve both Re and Re / Rth.
  • the uniaxially oriented polyester film of the present invention contains a polyester resin.
  • the uniaxially oriented polyester film of the present invention may be a single-layer film having a polyester resin as a main component or a multilayer film having at least one layer having a polyester resin as a main component.
  • the surface treatment may be performed on both surfaces or one surface of these single layer films or multilayer films, and this surface treatment is performed by corona treatment, saponification treatment, heat treatment, ultraviolet irradiation, electron beam irradiation, or the like. Modification may be sufficient, and thin film formation by application
  • the mass ratio of the polyester resin in the entire film is usually 50% by mass or more, preferably 70% by mass or more, more preferably 90% by mass or more.
  • the uniaxially oriented polyester film of the present invention preferably has an easy adhesion layer laminated on at least one side of the uniaxially oriented polyester film described above. More preferably, the easy-adhesion layer contains particles, and the height at which the particles protrude from the surface of the easy-adhesion layer is equal to or greater than the film thickness of the easy-adhesion layer; The height at which the above-mentioned particles protrude from the surface of the above-mentioned easy adhesion layer is an average value at 5 points in the 1 mm square easy-adhesion layer.
  • the slipperiness decreases and wrinkles occur. Is likely to occur.
  • the type of particle is not particularly limited as long as it satisfies the object of the present invention. Specific examples include, for example, silica, calcium carbonate, magnesium carbonate, barium carbonate, calcium sulfate, calcium phosphate, magnesium phosphate, Examples of the particles include kaolin, aluminum oxide, titanium oxide, and zirconium oxide, and silica, aluminum oxide, titanium oxide, and zirconium oxide are preferable.
  • the intrinsic viscosity IV (Intrinsic Viscosity) of the polyester resin is preferably 0.5 or more and 0.9 or less, more preferably 0.52 or more and 0.8. Hereinafter, it is more preferably 0.54 or more and 0.7 or less. In order to obtain such an IV, solid phase polymerization may be used in combination with the melt polymerization described later when the polyester resin is synthesized.
  • the acetaldehyde content of the polyester resin is preferably 50 ppm or less. More preferably, it is 40 ppm or less, Most preferably, it is 30 ppm or less. Acetaldehyde easily causes a condensation reaction between acetaldehydes, and water is generated as a side reaction product, which may cause hydrolysis of the polyester. The lower limit of the acetaldehyde content is practically about 1 ppm.
  • Sb-based catalyst As the Sb-based catalyst, those described in JP-A-2012-41519, [0050], [0052] to [0054] can be used.
  • the method of polymerizing the polyester resin using the Sb-based catalyst is not particularly limited, but specifically, the polymerization can be performed according to [0086] to [0087] of WO2012 / 157762.
  • additive It is also preferable to add a known additive to the uniaxially oriented polyester film of the present invention.
  • a known additive include ultraviolet absorbers, particles, lubricants, antiblocking agents, heat stabilizers, antioxidants, antistatic agents, light resistance agents, impact resistance improvers, lubricants, dyes, pigments and the like.
  • the polyester film generally requires transparency, it is preferable to keep the additive amount to a minimum.
  • 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. Absent.
  • the amount of the ultraviolet absorber contained in the uniaxially oriented polyester film of the present invention is usually 10.0% by mass or less, preferably 0.3 to 3.0% by mass.
  • the ultraviolet absorber may bleed out on the surface, which may cause deterioration of surface functionality such as adhesion deterioration.
  • a film having at least a three-layer structure is preferable, and the ultraviolet absorber is preferably blended in the intermediate layer.
  • this compound can be prevented from bleeding out to the film surface, and as a result, characteristics such as film adhesion can be maintained.
  • the masterbatch method described in [0050] to [0051] of WO2011 / 162198 can be used for these formulations.
  • melt containing the polyester resin melt-kneaded from the die it may be extruded as a single layer or as a multilayer.
  • a layer containing an ultraviolet grade agent (UV agent) and a layer not containing it may be laminated.
  • UV agent ultraviolet grade agent
  • the bleed-out UV agent is undesirably easily transferred to a pass roll in the film-forming process, increasing the coefficient of friction between the film and the roll, and causing scratches.
  • a polymer layer (preferably an easy-adhesion layer) may be formed by coating on the substantially unstretched polyester film that has been melt-extruded before or after stretching described below.
  • the polymer layer include functional layers that the polarizing plate may generally have, and among them, it is preferable to form an easy adhesion layer as the polymer layer.
  • the easy-adhesion layer can be applied by the method described in [0062] to [0070] of WO2012 / 157762.
  • the above-mentioned composition for forming an easy-adhesion layer (preferably a coating solution) contains particles, and the height at which the above-mentioned particles protrude from the surface of the above-mentioned easy-adhesion layer is as described above. It is preferable to form the easy-adhesion layer by controlling the thickness of the easy-adhesion layer and the average particle diameter of the particles so that the film thickness is equal to or greater than the thickness.
  • the production method of the present invention uses a tenter-type stretching device having a clip that travels along a pair of rails installed on both sides of a film conveyance path, and grips a substantially unstretched polyester film with the aforementioned clip. A step of transverse stretching.
  • the film surface temperature in the range of 1 to 2 times the draw ratio is preferably 80 ° C. or more and 92 ° C. or less, more preferably 82 ° C. or more and 91 ° C. or less in the above-described transverse stretching step. It is preferably 84 ° C. or higher and 91 ° C. or lower.
  • the film surface temperature in the range of 1 to 2 times the draw ratio is 80 ° C. or higher, the orientation and orientation crystallization do not proceed excessively in the drawing stage, Rth is difficult to increase, and the Re / Rth ratio is 0.7 or more.
  • the manufacturing method of the uniaxially oriented polyester film of this invention includes the heat setting process which heats the polyester film after the above-mentioned transverse stretching to the highest temperature in the above-mentioned tenter. After stretching, a heat treatment called “heat setting” is performed to promote crystallization. By performing at a temperature exceeding the stretching temperature, crystallization can be promoted and the strength of the film can be increased. In heat setting, volume shrinks due to crystallization.
  • a heat fixing method several slits for sending hot air to the extending portion are provided in parallel to the width direction. This can be achieved by making the temperature of the gas blown out from the slit higher than the stretched portion. Further, a heat source (IR heater, halogen heater, etc.) may be installed near the drawing (part) exit to raise the temperature.
  • the antireflection film of the present invention is an antireflection film in which an antiglare layer is laminated on at least one surface of the uniaxially oriented polyester film of the present invention.
  • the uniaxially oriented polyester film of the present invention can be used for an antireflection film.
  • the antiglare layer may be formed by either a wet coating method or a dry coating method.
  • the material for forming the transparent conductive layer is not particularly limited, and examples thereof include indium / tin composite oxide (ITO), tin oxide, copper, silver, aluminum, nickel, chromium, and the like. May be formed in an overlapping manner.
  • the transparent conductive layer may be provided with an undercoat layer for improving transparency and optical characteristics before forming the transparent conductive layer.
  • a metal layer made of a single metal element or an alloy of two or more metal elements may be provided between the undercoat layer and the uniaxially oriented polyester film. It is desirable to use a metal selected from the group consisting of silicon, titanium, tin and zinc for the metal layer.
  • the layer structure of the touch panel sensor electrode part in the touch panel is a bonding method in which two transparent electrodes are bonded, a method in which transparent electrodes are provided on both surfaces of a single substrate, a single-sided jumper or a through-hole method, or a single-area layer method. But you can.
  • the projected capacitive touch panel is preferably AC driven rather than DC driven, and more preferably is a drive system that requires less time to apply voltage to the electrodes.
  • Example 1 [Examples 2 to 8, 10 and Comparative Examples 1 to 5]
  • a uniaxially oriented polyester film of each example and comparative example was produced in the same manner as in Example 1 except that the size (organosilica sol manufactured by Nissan Chemical Industries, Ltd., primary average particle size 60 nm) was changed.
  • Example 9 A uniaxially oriented polyester film of Example 9 was produced in the same manner as Example 1 except that the easy adhesion layer was not provided.
  • the transverse stretch ratio, the transverse stretch film temperature (film surface temperature), the maximum reached film surface temperature during heat setting / relaxation, the MD relaxation rate, the TD relaxation rate, and the film thickness are changed.
  • a uniaxially oriented polyester film of Comparative Example 6 was produced in the same manner as in Example 1 except that the easy adhesion layer was not provided.
  • Comparative Example 6 a uniaxially oriented polyester film was produced by a similar method based on the description in Example 2 of JP2012-230390A.
  • MD breaking strength TBMD The MD breaking strength TBMD of the film was measured according to the measurement method of JIS K 7127. At the center position in the film width direction, a test piece TB1 was cut out with a size of 150 mm in the MD direction and 10 mm in the TD direction. A tensile test was performed on the sample piece TB1 using a strograph R2 manufactured by Toyo Seiki Seisakusho. The distance between chucks was 100 mm, and the tensile speed was 10 mm / min. This test was repeated five times, and the average value of the obtained tensile breaking strengths was defined as MD breaking strength TBMD. The results are shown in Table 2 below.
  • ⁇ Measurement of MD thermal shrinkage> At the center position in the film width direction, a test piece M1 was cut out with a size of 30 mm in the TD direction and 120 mm in the MD direction. Two reference lines were put on the sample piece M1 so as to have an interval of 100 mm in the MD direction. This was left in a heating oven at 150 ° C. for 30 minutes under no tension. After this standing, the sample piece M1 was cooled to room temperature, and the interval between the two reference lines was measured. This value was defined as A1 (unit: mm), and the numerical value calculated from the measured A1 and the formula of “100 ⁇ (100 ⁇ A1) / 100” was defined as the MD heat shrinkage rate. The results are shown in Table 2 below.
  • a polarizing plate is placed on a continuous light source (white LED), and a uniaxially stretched polyester film of each Example and Comparative Example is laminated thereon, and the blackout generated when observed while rotating polarized sunglasses is as follows. Evaluated by criteria. In addition, it bonded together so that the angle of the slow axis of a film with respect to the absorption axis of a polarizing plate might turn into the angle as described in an Example.
  • D Blackout occurs Evaluation results are shown in Table 2 below.
  • the direction of the scratch was not limited, and both the scratch in the TD direction and the scratch in the MD direction were included in the break when penetrating in the film thickness direction.
  • the results evaluated according to the following criteria are shown in Table 2 below.
  • ⁇ Touch panel thickness suitability The touch panel thickness suitability was evaluated according to the following criteria.
  • the uniaxially oriented polyester film produced in each example satisfying the production conditions specified in the present invention satisfies all the above formulas 1 to 7, can suppress the occurrence of rainbow unevenness, and is used for a touch panel. It was found that the thickness was particularly suitable for use as a base material for various films for touch panels. On the other hand, it was found that the uniaxially oriented polyester of Comparative Example 1 in which the range of the thickness t exceeds the upper limit value defined in the present invention and Re exceeds the upper limit value defined in the present invention is inferior in touch panel thickness suitability.
  • TD tear strength is lower than the lower limit specified in the present invention
  • MD fracture strength is less than the lower limit specified in the present invention
  • uniaxially oriented polyester film rainbow unevenness is visible, many wrinkles during processing It occurred, and it was found that breaking during processing was frequent.
  • the film surface temperature at the start of transverse stretching exceeds the upper limit specified in the present invention
  • the film surface temperature at the end of transverse stretching is lower than the lower limit defined in the present invention
  • the film surface temperature is increased from the start of stretching to the end of stretching.
  • the film surface temperature at the start of transverse stretching exceeds the upper limit defined in the present invention, and the uniaxially oriented polyester film produced in Comparative Example 6 without gradually increasing the film surface temperature from the start of stretching to the end of stretching, It was found that the TD tear strength was lower than the lower limit value defined in the present invention, the MD fracture strength was lower than the lower limit value defined in the present invention, and the fracture during processing was frequent. Therefore, from Comparative Example 6, the uniaxially oriented polyester film of the present invention has a problem of breakage in the processing steps of various films used for the touch panel, compared to the uniaxially oriented polyester film described in the examples of JP 2012-230390 A. It turned out that it was excellent in the point which can be eliminated.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)
  • Surface Treatment Of Optical Elements (AREA)

Abstract

Selon l'invention, un film polyester à orientation uniaxiale permet d'empêcher l'apparition d'irrégularités iridescentes, permet de résoudre les plis et fissures d'un processus de d'usinage, présente une épaisseur adaptée à un matériau de base pour panneau tactile, et satisfait les formules suivantes. 20μm≦t≦60μm ; 2000nm≦Re≦6500nm ; 0,7≦Re/Rth≦1,4 ; 2000MPa≦EMD ; 2≦ETD/EMD≦3 ; 5g.cm/cm≦TRTD ; et 50MPa≦TBMD. t représente l'épaisseur de film ; Re représente le retard à l'intérieur du plan du film ; Rth représente le retard dans la direction de l'épaisseur du film ; EMD représente le module d'élasticité dans la direction longitudinale du film ; ETD représente le module d'élasticité dans la direction latérale du film ; TRTD représente la résistance à la déchirure dans la direction latérale du film ; et TBMD représente la résistance à la déchirure dans la direction longitudinale du film. Enfin, l'invention concerne un film de revêtement dur, un film de détection pour panneau tactile, un film anti-diffusion, un film anti-réflexion, un panneau tactile, et le film polyester à orientation uniaxiale.
PCT/JP2015/070495 2014-07-18 2015-07-17 Film polyester à orientation uniaxiale ainsi que procédé de fabrication de celui-ci, film de revêtement dur, film de détection pour panneau tactile, film anti-diffusion, film anti-réflexion et panneau tactile WO2016010134A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP2016534499A JP6314228B2 (ja) 2014-07-18 2015-07-17 一軸配向ポリエステルフィルム、ハードコートフィルム、タッチパネル用センサーフィルム、飛散防止フィルム、反射防止フィルム、タッチパネルおよび一軸配向ポリエステルフィルムの製造方法
CN201580037741.XA CN106488839B (zh) 2014-07-18 2015-07-17 单轴取向聚酯薄膜、硬涂层薄膜、触摸面板用传感器薄膜、防飞散膜、防反射膜、触摸面板及单轴取向聚酯薄膜的制造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2014-148113 2014-07-18
JP2014148113 2014-07-18

Publications (1)

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WO2016010134A1 true WO2016010134A1 (fr) 2016-01-21

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JP (1) JP6314228B2 (fr)
CN (1) CN106488839B (fr)
WO (1) WO2016010134A1 (fr)

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WO2020085307A1 (fr) * 2018-10-26 2020-04-30 東洋紡株式会社 Film d'alignement permettant de transférer une couche d'alignement de composé de cristaux liquides
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