WO2021066418A1 - 폴리에스테르 다층 필름 및 그 제조방법 - Google Patents

폴리에스테르 다층 필름 및 그 제조방법 Download PDF

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WO2021066418A1
WO2021066418A1 PCT/KR2020/013113 KR2020013113W WO2021066418A1 WO 2021066418 A1 WO2021066418 A1 WO 2021066418A1 KR 2020013113 W KR2020013113 W KR 2020013113W WO 2021066418 A1 WO2021066418 A1 WO 2021066418A1
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Prior art keywords
equation
stretching
film
speed
polyester
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PCT/KR2020/013113
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English (en)
French (fr)
Korean (ko)
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조현국
김설경
박한수
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코오롱인더스트리 주식회사
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Priority to JP2022519485A priority Critical patent/JP7336592B2/ja
Priority to CN202080068744.0A priority patent/CN114466737B/zh
Publication of WO2021066418A1 publication Critical patent/WO2021066418A1/ko

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    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/001—Combinations of extrusion moulding with other shaping operations
    • B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • 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
    • B29C55/10—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial
    • B29C55/12—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial
    • B29C55/14—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively
    • B29C55/143—Shaping by stretching, e.g. drawing through a die; Apparatus therefor of plates or sheets multiaxial biaxial successively firstly parallel to the direction of feed and then transversely thereto
    • 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
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/14—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers
    • B32B37/15—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the properties of the layers with at least one layer being manufactured and immediately laminated before reaching its stable state, e.g. in which a layer is extruded and laminated while in semi-molten state
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • 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
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/0036—Heat treatment
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/03—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers with respect to the orientation of features
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00—Use of polyesters or derivatives thereof, as moulding material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/42—Polarizing, birefringent, filtering
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/514—Oriented
    • B32B2307/518—Oriented bi-axially
    • 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
    • B32B2307/50—Properties of the layers or laminate having particular mechanical properties
    • B32B2307/538—Roughness

Definitions

  • the present invention relates to a polyester multilayer film and a method of manufacturing the same.
  • An optical film is a film used as an optical material for a display. It is used as an optical material for surface protection and process carriers of various optical displays such as LCD BLU (Back Light Unit) or touch panel. As such an optical film, a polyester film is mainly used.
  • the prior art has proposed a method of lowering the orientation angle through uniaxial stretching or biaxial stretching close to uniaxial stretching in order to suppress polarization irregularities or rainbow irregularities.
  • the above method has a limitation in productivity, and there is a problem in that it is not possible to completely control the distortion of color that may decrease the inspection sensitivity when inspecting defects in the polarizing plate.
  • the orientation angle of the film could not be lowered to a desired level, and both optical properties and photofunctionality did not exhibit excellent effects.
  • Another object of the present invention is to provide a method for producing a polyester film for a polarizing plate excellent in productivity.
  • a core layer comprising a first polyester resin
  • At least one or more skin layers including a second polyester resin and an anti-blocking agent formed on both sides of the core layer,
  • Equation 1 is relational expressions for the stretching speed and stretching ratio of MD and TD, based on the width direction.
  • Equation 3 the orientation angle measured by the microwave molecular aligning machine is Equation 3
  • Equation 4 the in-plane retardation standard deviation (Re standard deviation) measured at 590 nm with a retardation meter satisfies Equation 4,
  • Polyester multilayer films are provided:
  • MDs is the stretching speed in the machine direction calculated by Equation 5 below
  • Equation 5 S 1st and S 2nd are each independently a drawing speed for each section between each drawing roll represented by the following Equations 6 and 7 in a two-stage drawing process using a device having first to third drawing rolls. (%/min),
  • E 1 and E 2 are the draw ratios (%) in each section of the two-stage stretching process, respectively.
  • R 1, R 2 , and R 3 are each independently a rotation speed (m/min) of an individual drawing roll (R/L),
  • L 1 is the distance between the first draw roll and the second draw roll (m)
  • L 2 is the distance between the second draw roll and the third draw roll (m)
  • Equation 2 TDs is the stretching speed in the width direction calculated by Equation 8 below,
  • Equation 8 E is a stretching ratio (%) in a plurality of stretching zones in a tenter-type stretching step after a two-stage stretching step provided with the first to third stretching rolls,
  • L is the total length (m) of the plurality of stretching zones
  • LSP is the line speed (m/min) in the tenter-type drawing process
  • composition comprising a) i) a first polyester resin chip, ii) a second polyester resin chip and an anti-blocking agent, the core layer and both sides of the core layer Coextrusion and quenching at 30° C. or less to produce an unstretched sheet so that at least one or more skin layers are included in the multilayer;
  • first element may be referred to as a second element, and similarly, a second element may be referred to as a first element.
  • a core layer comprising a first polyester resin; And at least one skin layer, including a second polyester resin and an anti-blocking agent formed on both sides of the core layer, including, and the following Equations 1 and 2, which are relational expressions for the elongation rate and elongation ratio of MD and TD.
  • Equations 1 and 2 which are relational expressions for the elongation rate and elongation ratio of MD and TD.
  • the orientation angle measured by the microwave molecular aligning machine satisfies Equation 3 based on the width direction, and the in-plane retardation standard deviation (Re standard deviation) measured at 590 nm with a retardation meter.
  • a polyester multilayer film may be provided.
  • MDs is the stretching speed in the machine direction calculated by Equation 5 below
  • Equation 5 S 1st and S 2nd are each independently a drawing speed for each section between each drawing roll represented by the following Equations 6 and 7 in a two-stage drawing process using a device having first to third drawing rolls. (%/min), and
  • E 1 and E 2 are the draw ratios (%) in each section of the two-stage stretching process, respectively.
  • R 1, R 2 , and R 3 are each independently a rotation speed (m/min) of an individual drawing roll (R/L),
  • L 1 is the distance between the first draw roll and the second draw roll (m)
  • L 2 is the distance between the second draw roll and the third draw roll (m)
  • Equation 2 TDs is the stretching speed in the width direction calculated by Equation 8 below,
  • Equation 8 E is a stretching ratio (%) in a plurality of stretching zones in a tenter-type stretching step after a two-stage stretching step provided with the first to third stretching rolls,
  • L is the total length (m) of the plurality of stretching zones
  • LSP is the line speed (m/min) in the tenter-type drawing process
  • the present invention is to provide a polyester film capable of suppressing polarization unevenness, which is a major requirement for use as a protective film for a polarizing plate and a base film for a release film, among subsidiary materials used for a polarizing plate in the field of optical displays. .
  • the present invention is to provide a polyester film having excellent photofunctionality by controlling an orientation angle and a retardation deviation in order to secure excellent appearance quality and post-processing stability.
  • the present inventors appropriately adjust the stretching speed and the stretching ratio of the machine direction and the transverse direction when manufacturing the polyester film, thereby setting the TD standard, the orientation angle. It lowered and lowered the phase difference deviation to impart TD orientation, optical properties, and optical functionality.
  • the present invention reduces the orientation angle and lowers the phase difference deviation in the width direction to suppress polarization or rainbow stains, and exhibits a low thickness deviation rate and high light transmittance. Characterized in that to prepare an ester multilayer film.
  • a multi-layered polyester film with improved optical properties is prepared by applying a biaxial stretching method in which the stretching speed is controlled.
  • an aspect of the present invention relates to a biaxially stretched polyester film, wherein the polyester film includes a core layer including a first polyester resin; And at least one or more skin layers including a second polyester resin and an anti-blocking agent formed on both surfaces of the core layer.
  • the polyester multilayer film satisfies the following equations 1 to 2, which are the relational equations for the stretching speed and stretching ratio of MD and TD, and a molecular orientation angle analyzer (MOA) for the width direction of the entire film.
  • equations 1 to 2 are the relational equations for the stretching speed and stretching ratio of MD and TD, and a molecular orientation angle analyzer (MOA) for the width direction of the entire film.
  • MOA molecular orientation angle analyzer
  • the in-plane phase difference (Re) value which is the standard deviation of the value obtained by multiplying the thickness (d) by the birefringence index ( ⁇ n) expressed as a value of the difference in refractive index in the direction of the main alignment axis and in the vertical direction based on the main alignment axis, can satisfy Equation 4 below. .
  • Equation 1 the value of MDs is 45,000%/min. If it is smaller than, it is difficult to ensure thickness uniformity due to insufficient orientation crystal, and if it is larger than 55,000%/min., MD orientation crystal becomes high and it is difficult to lower the orientation angle.
  • Equation 2 the value of TDs is 4,500%/min. If it is smaller than that, it is difficult to secure the thickness uniformity due to insufficient uniformity of stress transfer to the TD, and if it is greater than 5,500%/min. There is a fear of lowering productivity.
  • the TD reference orientation angle in Equation 3 is more than 12°, when applied as a protective film or release film for a polarizing plate, the detection sensitivity of foreign matters or defects is significantly lowered due to color distortion, so it is necessary to manage less than 12°. .
  • Equation 4 measured based on the width direction of the entire film, if the standard deviation of Re, which is the in-plane phase difference value, is greater than 100 based on the TD, the uniformity of light transmittance is insufficient, making it difficult to increase the optical functionality.
  • MDs is the drawing speed in the machine direction (MD drawing speed)
  • TDs is the drawing speed in the width direction (TD drawing speed)
  • each drawing speed is calculated by the following Equations 5 to 8. I can.
  • the stretching speed in the machine direction can be calculated by Equation 5 below.
  • Equation 5 S 1st and S 2nd are each independently stretching by section between each of the drawing rolls represented by the following Equations 6 and 7 in a two-stage drawing process using an apparatus having first to third drawing rolls. Is the speed (%/min),
  • E 1 and E 2 are the draw ratios (%) in each section of the two-stage stretching process, respectively.
  • R 1, R 2 , and R 3 are each independently a rotation speed (m/min) of an individual drawing roll (R/L),
  • L 1 is the distance between the first draw roll and the second draw roll (m)
  • L 2 is the distance between the second draw roll and the third draw roll (m))
  • FIG. 1 An example of a two-stage drawing roll provided with the first to third drawing rolls is as shown in FIG. 1.
  • the stretching speed in the machine direction represents the MD stretching speed in the Roll to Roll MD stretching process using the circumferential speed difference.
  • this stretching process may be calculated according to the parameters of Equations 5 to 7 described above based on the stretching process diagram during two-stage stretching of the MD Flat.
  • the stretching step is divided, the stretching speed of each section is calculated, and the finally obtained average value is defined as the MD stretching speed.
  • the stretching speed in the width direction can be calculated by Equation 8 below.
  • E is the draw ratio (%) in the plurality of draw zones in the tenter-type drawing process after the two-stage drawing process with the first to third drawing rolls
  • L is the total length (m) of the plurality of stretching zones
  • LSP is the line speed (m/min) in the tenter-type drawing process
  • the polyester multilayer film may be provided through a two-stage stretching process provided with at least one plurality of draw rolls or first to third draw rolls and at least one draw zone.
  • FIG. 2 is a schematic diagram of a tenter-type stretching process including a plurality of stretching zones.
  • the draw ratio of longitudinal drawing refers to the ratio of the length after drawing to the length before drawing, that is, (length after drawing/length before drawing), but when calculated in an actual continuous process, roll-to-roll longitudinal drawing (machine direction In the case of stretching), the ratio of the roll speed after stretching to the roll speed before stretching can be used as the stretching ratio.
  • the ratio of the width of the outlet to the width of the entrance of the tenter may be defined as the stretching ratio.
  • the polyester multilayer film exhibits a lower thickness deviation ratio than the conventional one, and thus optical properties can be improved.
  • the present invention it is possible to provide a biaxially oriented polyester film having excellent high-speed processing and running performance by suppressing polarization unevenness and having an Ra value, which is the surface roughness of the center line of the irregularities generated by organic/inorganic particles, satisfies the following Equation 9 .
  • the polyester film having the above characteristics may have a thickness of 19 to 75 ⁇ m.
  • Equation 9 if the value of the surface roughness (surface roughness) is less than 15 nm, the probability of causing scratches in the process of passing the roll in the stretching process increases, and if it is greater than 25 nm, the air layer between the film and the film in the winding process Due to the excessive formation, there is a high probability that the foaming phenomenon will occur, resulting in a high probability of winding defects.
  • the orientation angle defined in Equation 3 means an orientation angle based on TD
  • Re described in Equation 4 means an in-plane phase difference, and can be calculated by Equation 10.
  • the standard deviation (Re standard deviation) of the in-plane phase difference of Equation 4 can be calculated by Equation 11.
  • nx is the refractive index in the direction of the main orientation axis
  • ny is the refractive index corresponding to the vertical direction in the main orientation axis direction
  • d is the thickness of the film.
  • the film has excellent runability and winding property within the range of the surface roughness that satisfies Equation 9, so that scratches can be prevented when the film passes through the roll, and the foam can be prevented from falling out due to an excessive air layer when winding. It is preferable because it has excellent coating properties during post-processing, so that the coating stability required by the user can be satisfied, and the release agent can be applied uniformly and at high speed. More preferably, Ra may be 16 to 23 nm.
  • the core layer may be 70 to 90% by weight of the total film, and the skin layer may be 10 to 30% by weight of the total film.
  • the anti-blocking agent may include organic particles, inorganic particles, or mixtures thereof.
  • the polyester resin used for the core layer and the skin layer and constituting the polyester film of the present invention is not particularly limited, and a conventional polyester resin may be used.
  • the polyester resin is obtained by condensation polymerization of an acidic component containing a dicarboxylic acid as a main component and a glycol component containing an alkylene glycol as a main component.
  • the dicarboxylic acid is not limited, but terephthalic acid or its alkyl ester or phenyl ester may be used, and some are difunctional carboxylates such as isophthalic acid, oxyethoxy benzoic acid, adipic acid, sebacic acid and 5-sodium sulfoisophthalic acid.
  • glycol component ethylene glycol is mainly used, and propylene glycol, neopentyl glycol, trimethylene glycol, 1,4-cyclohexanediol, 1,4-cyclohexanedimethanol, 1,4-bisoxy Ethoxybenzene, bisphenol, and polyoxyethylene glycol may be mixed and used, and a monofunctional compound or a trifunctional compound may be partially used in combination.
  • additives commonly used in the film field that is, pinning, antistatic agents, ultraviolet stabilizers, waterproofing agents, slip agents, and thermal stabilizers when polymerizing polyester resins.
  • additives commonly used in the film field that is, pinning, antistatic agents, ultraviolet stabilizers, waterproofing agents, slip agents, and thermal stabilizers when polymerizing polyester resins.
  • the polyester resin may be prepared by terephthalic acid (TPA) polymerization or dimethyl terephthalate (DMT) polymerization, which are conventional polymerization methods in the art, but is not limited thereto.
  • TPA terephthalic acid
  • DMT dimethyl terephthalate
  • the polyester resin may be polyethylene terephthalate. That is, the polyester resin may be polyethylene terephthalate prepared using terephthalic acid as a dicarboxylic acid and ethylene glycol as a glycol.
  • the polyester film of the present invention contains particles as an anti-blocking agent in order to form a uniform surface roughness.
  • the anti-blocking agent is added to form scratch resistance and uniform surface roughness, and may be any one or a mixture of two or more selected from organic particles and inorganic particles.
  • the inorganic particles any particles that are obviously used in the art may be used without limitation.
  • any one or two or more selected from calcium carbonate, silica, titanium dioxide, kaolin, barium sulfate, alumina silicate, calcium carbonate, etc. may be mixed and used, but is not limited thereto.
  • the organic particles are silicone resin, crosslinked divinylbenzene polymethacrylate, crosslinked polymethacrylate, crosslinked polystyrene resin, benzoguanamine-formaldehyde resin, benzoguanamine-melamine-formaldehyde resin, and melamine-formaldehyde resin. It may be any one or a mixture of two or more selected from the group consisting of, but is not limited thereto.
  • the content of the anti-blocking agent is not limited, but may be included as 200 to 2,000 ppm in the entire film, and more specifically, may be included in 400 to 1,000 ppm.
  • the size of the anti-blocking agent is not limited, but may have an average particle diameter of 0.01 to 5 ⁇ m, more specifically 0.1 to 3 ⁇ m.
  • the addition of the anti-blocking agent in the form of a slurry dispersed in glycols when synthesizing a polyester resin is effective because it has excellent dispersibility and can prevent re-aggregation between particles, but is not limited thereto. It may be added when manufacturing a chip.
  • the biaxially stretched polyester film may be a multilayer film in which at least two or more layers are stacked, and the multilayer film includes a core layer and at least one layer on both sides of the core layer, respectively. It may include a laminated skin layer.
  • the polyester multilayer film may be a three-layer film in which a skin layer/core layer/skin layer is sequentially stacked.
  • the core layer is 70 to 90% by weight of the total film
  • the skin layer is 10 to 30% by weight
  • the skin layer contains an anti-blocking agent
  • the interfacial stability is excellent during coextrusion, so that the film formation is easy and the haze is reduced. It is low, satisfies Equations 1 to 3 described above, and can produce a film with little shrinkage.
  • the core layer may be made of a polyester resin, more specifically a polyethylene terephthalate resin alone.
  • an anti-blocking agent may be included, but from the viewpoint of improving film forming stability and film running property, the anti-blocking agent is preferably included in the skin layer.
  • the polyethylene terephthalate resin used for the core layer has an intrinsic viscosity of 0.6 to 0.7 dl/g, which is excellent in heat resistance, and interfacial instability does not occur during coextrusion, but is not limited thereto.
  • the skin layer contains a polyester resin having an intrinsic viscosity of 0.6 ⁇ 0.7 dl/g and an anti-blocking agent, and interfacial instability does not occur within the range of the intrinsic viscosity satisfying the above range, and is stably laminated with the core layer
  • the skin layer may improve film forming stability and film running property by using an anti-blocking agent.
  • the biaxially stretched polyester film may have a total thickness of 19 to 75 ⁇ m, more preferably 38 to 50 ⁇ m, and a base for electronic materials, which is a thin film within the above range. It can be suitably used as a film.
  • a) i) a first polyester resin chip, ii) a second polyester resin chip, and a composition comprising an anti-blocking agent are used to provide a core layer and both sides of the core layer. Coextrusion and quenching at 30° C. or less to produce an unstretched sheet so that at least one or more skin layers are included in the multilayer; And b) sequentially biaxially stretching the unstretched sheet to prepare a film. And c) heat setting the biaxially stretched film; including, wherein the step of producing a film by sequentially biaxially stretching the unstretched sheet at 85 to 110° C. in the machine direction of 45,000 to 55,000%/min. 2 to 5 times the primary longitudinal stretching at a speed; And secondary transverse stretching of the firstly stretched sheet at a rate of 4,500 to 5,500%/min. in the width direction at 95 to 140° C.; Can be.
  • the biaxially stretched polyester film includes any one or two or more anti-blocking agents selected from organic particles and inorganic particles, and may be a single layer or a multilayer film in which two or more layers are laminated. More specifically, it includes a core layer and a skin layer in which at least one or more layers are stacked on both sides of the core layer, respectively, the core layer is 70 to 90% by weight of the total film, and the skin layer is 10 to 30% by weight,
  • the skin layer may include any one or two or more anti-blocking agents selected from organic particles and inorganic particles.
  • one aspect of the method for producing a biaxially stretched polyester film of the present invention includes a first polyester resin chip including a polyester resin having an intrinsic viscosity of 0.6 to 0.7 dl/g, and an intrinsic viscosity of 0.6 to 0.7 dl/g.
  • a composition containing a second polyester resin chip containing g of polyester resin and an anti-blocking agent melt at 260 ⁇ 300°C and coextrusion, then discharge through a die in a single layer or in multiple layers of two or more layers, and then 30°C or less To prepare an unstretched sheet by rapid cooling.
  • the step of heat setting the film may include heat setting the secondly stretched film in a total of 5 heat treatment zones including the first heat treatment zone to the fifth heat treatment zone at 200 to 250°C, and from the fourth heat treatment zone to the fifth heat treatment zone. It may include the step of relaxing so that the total relaxation rate of the MD relaxation rate and the TD relaxation rate of 1 to 5%.
  • a core layer comprising a first polyester resin; And at least one or more skin layers including a second polyester resin and an anti-blocking agent formed on both sides of the core layer, and satisfying all parameter properties according to the above-described formula may be provided.
  • polarization mura is significantly suppressed by minimizing the deviation of low orientation angle and phase difference, and excellent optical properties and optical functionality and excellent appearance It has quality, minimizes thickness variation, has excellent productivity, and can manufacture a polyester film having a running property suitable for high-speed processing.
  • FIG. 1 is a schematic diagram of a roll-to-roll process diagram of an MD Flat for calculating an MD stretching speed according to an embodiment of the present invention.
  • FIG. 2 is a simplified illustration of a stretching zone in a tenter-type stretching facility for calculating a TD stretching speed according to an embodiment of the present invention.
  • FIG. 3 is a simplified illustration of a polarizing mirror rainbow spot evaluation method.
  • the core layer uses a polyethylene terephthalate (PET) chip with an intrinsic viscosity of 0.65 dl/g that does not contain inorganic particles, and the skin layer has an intrinsic viscosity of 0.65 dl containing 400-1000 ppm of silica particles with an average particle diameter of 2.6 ⁇ m.
  • PET polyethylene terephthalate
  • a polyethylene terephthalate chip of /g a three-layer film in which a skin layer/core layer/skin layer was sequentially laminated was prepared. Thereafter, the laminated film was coextruded and cast on a cooling roll controlled to 30° C. or less to prepare an unstretched sheet. At this time, the core layer was made to be 80% by weight of the total film weight, and the skin layer was made to be 20% by weight of the total film weight.
  • the unstretched sheet was stretched using the two-stage stretching process of the MD flat including the configuration of FIG. 1 and the tenter-type process of FIG. 2. Accordingly, the unstretched sheet was stretched 3.2 times at a rate of 54631%/min. in the machine direction (MD), and then stretched at 4.5 times at a rate of 4,875%/min. in the width direction (TD), and then at 215°C. Heat treated.
  • a multilayer film was prepared in the same manner as in Example 1, except that the MD draw ratio and the MD draw speed, the TD draw ratio and the TD draw speed, and the film thickness were changed.
  • Each manufactured film was measured according to the ASTM D-1003 measurement method using a Haze Meter (NIPPON DENSHOKU, NDH-5000, Japan).
  • Each film sample was mounted on a dedicated sample holder using a microwave molecular aligner (Oji Scientific Instruments, MOA-7015, Japan), and then inserted into the molecular aligner to measure the orientation angle. Since the orientation angle value is based on the MD, the absolute value of the value obtained by subtracting the actual measured value from 90° to have the orientation angle based on the TD is shown in Table 2.
  • the retardation value was measured at a measurement wavelength of 590 nm using a parallel Nicole rotation type retardation meter (Oji Scientific Instruments, KOBRA-WPR, Japan).
  • Films manufactured with an electric micrometer measuring device (Mahr, Millimar-1240, Germany) were measured at intervals of 5 cm in the width direction, and the measured thickness was calculated by Equation 12 below to calculate the thickness deviation R value.
  • the polyester film prepared based on JIS-B0601 was cut into an A4 size in the transverse reference center of the entire width, and then cut into a size of 30 mm ⁇ 30 mm with scotch tape on the sample stand of the surface roughness meter. After attaching, the surface roughness was measured under the conditions of a measurement speed of 0.05 mm/sec and a reference length (Cut-Off) of 0.08 mm.
  • the average value was calculated by selecting a reference length of 1.5mm in the direction of the center line from the curve of the film cross section and measuring a total of 5 times, and the Arithmetical Average Roughness (Ra) is the average height from the center line to the cross section curve as the center line average roughness value.
  • the length from which the film came out from the end face of the rolled roll was measured after setting the zero point with a length measuring machine (Mitutoyo, CA-30PSX, Japan).
  • the polyester film of the present invention has excellent optical properties and photofunctionality, has excellent appearance properties, and has a low thickness variation ratio, and thus can be used for a polarizing plate in an optical display field to contribute to performance improvement.
  • the present invention provides a method for producing a polyester film having superior productivity and running properties suitable for high-speed processing, and economical effects can be achieved.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Laminated Bodies (AREA)
  • Polarising Elements (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
PCT/KR2020/013113 2019-09-30 2020-09-25 폴리에스테르 다층 필름 및 그 제조방법 WO2021066418A1 (ko)

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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010046816A (ja) * 2008-08-19 2010-03-04 Toyobo Co Ltd 二軸配向積層ポリエステルフィルム
JP2012166555A (ja) * 2012-03-30 2012-09-06 Toyobo Co Ltd 偏光板保護用または位相差板保護用離型用ポリエステルフィルム、離型フィルム、及びその製造方法
KR20140053000A (ko) * 2011-08-30 2014-05-07 도레이 카부시키가이샤 편광판 이형 필름용 2축 배향 폴리에스테르 필름 및 그것을 사용한 적층체, 및 편광판의 제조방법
JP2017102442A (ja) * 2015-11-20 2017-06-08 東レ株式会社 二軸配向ポリエステルフィルム
KR20180077585A (ko) * 2016-12-29 2018-07-09 코오롱인더스트리 주식회사 이축연신 폴리에스테르 필름 및 이의 제조방법

Family Cites Families (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2825904B2 (ja) * 1990-01-30 1998-11-18 三菱化学株式会社 積層二軸延伸フィルムの製造方法
US6319587B1 (en) * 1998-09-24 2001-11-20 Toray Industries, Inc. Biaxially-oriented polyester film
JP2006334842A (ja) * 2005-05-31 2006-12-14 Fujifilm Holdings Corp 熱可塑性フィルムの製造方法及びそれを用いて製造した液晶表示板用光学補償フィルム
JP2008290388A (ja) * 2007-05-25 2008-12-04 Fujifilm Corp 二軸延伸熱可塑性樹脂フィルムの製造方法及び光学フィルム用ベースフィルム
CN102036818B (zh) * 2008-03-31 2014-04-02 可隆工业株式会社 用于光学应用的聚酯膜
JP5077143B2 (ja) * 2008-08-19 2012-11-21 東洋紡績株式会社 二軸配向積層ポリエステルフィルム
KR101976118B1 (ko) * 2012-06-29 2019-09-10 코오롱인더스트리 주식회사 폴리에스테르 필름의 제조방법
JP2013139151A (ja) 2013-03-11 2013-07-18 Toyobo Co Ltd 二軸配向ポリエステルフィルム
CN104395790B (zh) * 2013-06-18 2017-05-10 Lg化学株式会社 具有优异的光学性能的薄膜偏光片、其制造方法和包括所述薄膜偏光片的偏光板和显示装置
JP6297379B2 (ja) * 2014-03-26 2018-03-20 富士フイルム株式会社 ポリエステル樹脂フィルム、ポリエステル樹脂フィルムの製造方法、偏光板、画像表示装置、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、ガラス飛散防止フィルム、およびタッチパネル
KR102397408B1 (ko) * 2016-06-24 2022-05-11 코오롱인더스트리 주식회사 폴리에스테르 다층필름 및 이의 제조방법
KR102466413B1 (ko) * 2016-09-29 2022-11-11 코오롱인더스트리 주식회사 폴리에스테르 다층필름 및 이의 제조방법

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2010046816A (ja) * 2008-08-19 2010-03-04 Toyobo Co Ltd 二軸配向積層ポリエステルフィルム
KR20140053000A (ko) * 2011-08-30 2014-05-07 도레이 카부시키가이샤 편광판 이형 필름용 2축 배향 폴리에스테르 필름 및 그것을 사용한 적층체, 및 편광판의 제조방법
JP2012166555A (ja) * 2012-03-30 2012-09-06 Toyobo Co Ltd 偏光板保護用または位相差板保護用離型用ポリエステルフィルム、離型フィルム、及びその製造方法
JP2017102442A (ja) * 2015-11-20 2017-06-08 東レ株式会社 二軸配向ポリエステルフィルム
KR20180077585A (ko) * 2016-12-29 2018-07-09 코오롱인더스트리 주식회사 이축연신 폴리에스테르 필름 및 이의 제조방법

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