WO2014209056A1 - Film de polyester et son procédé de fabrication - Google Patents

Film de polyester et son procédé de fabrication Download PDF

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Publication number
WO2014209056A1
WO2014209056A1 PCT/KR2014/005737 KR2014005737W WO2014209056A1 WO 2014209056 A1 WO2014209056 A1 WO 2014209056A1 KR 2014005737 W KR2014005737 W KR 2014005737W WO 2014209056 A1 WO2014209056 A1 WO 2014209056A1
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WIPO (PCT)
Prior art keywords
film
polyester
equation
length
polyester film
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PCT/KR2014/005737
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English (en)
Korean (ko)
Inventor
정두환
백상현
최성란
조현
송기상
김시민
Original Assignee
코오롱인더스트리 주식회사
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
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Priority claimed from KR1020130074235A external-priority patent/KR101985469B1/ko
Priority claimed from KR1020130075754A external-priority patent/KR101998344B1/ko
Priority claimed from KR1020140078719A external-priority patent/KR102186530B1/ko
Application filed by 코오롱인더스트리 주식회사 filed Critical 코오롱인더스트리 주식회사
Priority to CN201811653488.2A priority Critical patent/CN110028687B/zh
Priority to JP2016523651A priority patent/JP2016525465A/ja
Priority to CN201480046297.3A priority patent/CN105473649B/zh
Publication of WO2014209056A1 publication Critical patent/WO2014209056A1/fr

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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—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
    • B32B27/20—Layered products comprising a layer of synthetic resin characterised by the use of special additives using fillers, pigments, thixotroping agents
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • 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
    • 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
    • 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
    • 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
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2551/00—Optical elements
    • C—CHEMISTRY; METALLURGY
    • 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
    • C08J2433/06—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 of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • 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
    • C08J2467/00—Characterised by the use of polyesters obtained by reactions forming a carboxylic ester link in the main chain; Derivatives of such polymers
    • C08J2467/02—Polyesters derived from dicarboxylic acids and dihydroxy compounds

Definitions

  • the present invention relates to a polyester film and a method for producing the same. More particularly, the present invention relates to a polyester film having excellent optical properties, controlling heat shrinkage, preventing migration of oligomers upon heating, and having low haze change rate after heating, and being applicable to optical applications, and a method of manufacturing the same.
  • An optical film is a film used as an optical member for display, and is used as an optical material for LCD BLU, or as an optical member for protecting a surface of various displays such as LCD, PDP, and touch panel.
  • Such optical films require excellent transparency and visibility, and use biaxially stretched polyester films having excellent mechanical and electrical properties as base films.
  • the biaxially stretched polyester film has low surface hardness and lacks abrasion resistance or scratch resistance, surface damage may be easily caused by friction or contact with an object when used as an optical member of various displays.
  • a hard coating layer is laminated on the surface of the film, and a primer layer may be formed as an intermediate layer in order to improve adhesion between the polyester film as a substrate and the hard coating layer.
  • Polyester films applied to such displays are experiencing quality problems associated with oligomer spills. This is because the oligomer is migrated inside the polyester film as it is exposed to high temperatures in post-processing processes such as curing and aging after adhesive coating to the polyester film, causing curling due to whitening or thermal deformation. can do.
  • a diamond mark phenomenon in which a diamond pattern is formed may occur due to the pressure of the diamond pattern roll used in the slitting process after the polyester film is manufactured. When such whitening and diamond mark phenomena occur, the film roll is contaminated in the process and the optical properties of the final product are degraded.
  • Japanese Patent Laid-Open Publication No. 2007-253511 (2007.10.04) is a polyester film having a laminated film on at least one surface, and forming the laminated film on the polyester film to control the outflow of the oligomer.
  • the laminated polyester film whose average size of the oligomer particle which precipitates in a laminated film at the time of heating for 10 minutes is 10 micrometer ⁇ 2> or less, and the number is 100 or less in the 100 micrometer * 100 micrometer visual field is described.
  • This invention seeks to control the outflow of oligomers but does not completely block them.
  • polyester film In addition, high temperature aging of the polyester film is used, or high heat-resistant polymer such as polyethylene naphthalate (PEN) or polyimide (PI).
  • PEN polyethylene naphthalate
  • PI polyimide
  • the polyester film is used at high temperature aging, the production yield of the film is not sufficient and deformation occurs due to moisture, and oligomer migration does not occur when the high heat resistant polymer is used, but manufacturing cost is considerably higher than that of polyester. There was a problem that was difficult to finish.
  • touch screen panel products are required to ensure fairness in the post-processing process.
  • the touch screen panel product is used by laminating three or more films such as a heat-resistant film for ITO protection and a polyester film for hard coating coated with a double-sided rainbow reduced primer. If the heat shrinkage of the three or more films do not match, the quality of the product may be degraded as problems such as curl and wrinkles occur due to the heat shrinkage mismatch in the post-processing at high temperature.
  • the present invention has an object to provide a polyester film is completely blocked out of the oligomer.
  • an object of the present invention is to provide an optical film including the polyester film.
  • the present invention is to provide a method for producing a polyester film that can block the migration of the oligomer after heating, while controlling the heat shrinkage rate.
  • an object of the present invention is to provide a polyester multilayer film suitable for ITO process, ITO base film and base film for hard coating for touch panel.
  • Smd means the shrinkage rate (%) in the machine direction (MD) of the film
  • Std means the shrinkage rate (%) in the width direction (TD) of the film.
  • Polyester film according to an embodiment of the present invention may satisfy the following formulas 3 and 4.
  • Vmd means the deviation (%) of thermal shrinkage in the machine direction of 10 samples selected at 50 cm intervals based on the full width of the film
  • Vtd is the deviation of thermal shrinkage in the width direction of 10 samples selected at 50 cm intervals based on the full width of the film ( %).
  • Polyester film according to an embodiment of the present invention can satisfy the following formula 5 to formula 7.
  • S (45) and S (135) is a thermal shrinkage (%) of the film measured in accordance with JIS C-2318 standard after maintaining a polyester film of 10cm in width, 10cm in length for 30 minutes at 150 °C
  • the thermal contraction rate (%) (the length of the film before heat treatment-the length of the film after holding for 30 minutes at 150 °C) / the length of the film before heat treatment ⁇ 100.
  • S (45) refers to the diagonal shrinkage (%) at a 45 ° angle clockwise relative to the film width direction (TD)
  • S (135) is a clock based on the film width direction (TD)
  • Polyester film according to an embodiment of the present invention can satisfy the following formula 8 and formula 9.
  • ns ⁇ (length-direction refractive index + width-direction refractive index) / 2 ⁇ - ⁇ (length-direction thickness refractive index + width-direction thickness refractive index) / 2 ⁇ means a plane orientation coefficient
  • Hf is the haze of the film after holding at 150 ° C. for 30 minutes, and Hi represents the haze of the film before heating.
  • the polyester base film includes a base layer and a skin layer in which at least two or more layers are laminated on both sides of the base layer,
  • the oligomer content of the polyester resin constituting the skin layer may be 0.3 to 0.6% by weight, and the content of diethylene glycol may be 0.1 to 1.2% by weight.
  • the polyester base film is a co-extruded base material layer and the skin layer, the intrinsic viscosity may satisfy the following formula (10).
  • Ns is the intrinsic viscosity of the polyester resin constituting the skin layer
  • Nc is the intrinsic viscosity of the polyester resin constituting the base layer.
  • the polyester base film has an inherent viscosity of 0.5 to 1.0 of the polyester resin constituting the base layer, 0.6 to 1.0 days intrinsic viscosity of the polyester resin constituting the skin layer Can be.
  • the primer layer has a Tg of 60 ° C. or more, a swelling ratio of 30% or less, a gel fraction of 95% or more, and a density of 1.3 to 1.4. Can be.
  • Polyester film according to an embodiment of the present invention may have a haze change rate ( ⁇ H) according to the following formula 11 is 0.1% or less.
  • the water dispersible resin composition is a binder resin composed of an acrylic resin (A) copolymerized with a glycidyl group-containing radically polymerizable unsaturated monomer and a water dispersible polyester resin (B). Including;
  • the water dispersible resin composition may have a solid content of 0.5 to 10% by weight of the binder resin.
  • the water dispersible resin composition may further include a silicone-based wetting agent.
  • the water-dispersible polyester-based resin may be a copolymer of a dicarboxylic acid component containing a sulfonic acid alkali metal salt compound and a glycol component containing diethylene glycol.
  • the water-dispersible polyester-based resin may contain 20 to 80 mol% of diethylene glycol in the total glycol component.
  • the water-dispersible polyester-based resin may contain 6 to 20 mol% of the sulfonic acid alkali metal salt compound in the total acid component.
  • the acrylic resin may contain 20 to 80 mol% of the glycidyl group-containing radical polymerizable unsaturated monomer as a copolymerization monomer in all monomer components.
  • the polyester base film may be a polyethylene terephthalate film.
  • the polyester base film may have a thickness of 25 ⁇ 250 ⁇ m.
  • the primer layer may have a dry coating thickness of 20 ⁇ 150nm.
  • the polyester base film may be 70 to 90% by weight of the base layer, 10 to 30% by weight of the skin layer.
  • Polyester film according to an embodiment of the present invention may have a surface roughness (Ra) of less than 10nm.
  • the skin layer may include less than 100ppm inorganic particles.
  • the inorganic particles may have an average particle diameter of less than 3 ⁇ m.
  • the inorganic particles may be any one or a mixture of two or more selected from silica, zeolite and kaolin.
  • the present invention can provide an optical film having at least one functional coating layer selected from a hard coating layer, an adhesive layer, a light diffusion layer, an ITO layer and a printing layer on the polyester film described above.
  • the present invention comprises the steps of a) preparing a polyester base film uniaxially stretched in the machine direction;
  • a primer layer by applying a water-dispersible resin composition having oligomer barrier properties to one or both surfaces of the uniaxially stretched polyester base film;
  • the relaxation ratio (%) (travel speed of the film in the relaxation section-travel speed of the film before the relaxation section) / running speed of the film before the relaxation section ⁇ 100.)
  • step d) the relaxation of the machine direction (MD) can be carried out in a temperature range satisfying the following equation (13).
  • the polyester film may have a thermal contraction rate (%) satisfying the following Formulas 1 to 4.
  • Smd, Std, Vmd and Vtd means the thermal shrinkage (%) of the film measured according to JIS C-2318 standard after maintaining the polyester film of 10cm in width, 10cm in length for 30 minutes at 150 °C ,
  • the heat shrinkage percentage (%) (length of the film before heat treatment-the length of the film after holding for 30 minutes at 150 °C) / length of the film before heat treatment ⁇ 100,
  • Smd means the shrinkage rate (%) in the machine direction (MD) of the film
  • Std means the shrinkage rate (%) in the width direction (TD) of the film
  • Vmd is 10 samples selected at 50cm intervals based on the full width of the film
  • the deviation of thermal shrinkage in the machine direction (%), Vtd refers to the deviation (%) of thermal shrinkage in the width direction of 10 samples selected at 50cm intervals based on the full width of the film.
  • the polyester film may satisfy the following formulas 5 to 7.
  • S (45) and S (135) is a thermal shrinkage (%) of the film measured in accordance with JIS C-2318 standard after maintaining a polyester film of 10cm in width, 10cm in length for 30 minutes at 150 °C
  • the thermal contraction rate (%) (the length of the film before heat treatment-the length of the film after holding for 30 minutes at 150 °C) / the length of the film before heat treatment ⁇ 100.
  • S (45) refers to the diagonal shrinkage (%) at a 45 ° angle clockwise relative to the film width direction (TD)
  • S (135) is a clock based on the film width direction (TD)
  • the primer layer has a T g of 60 ° C. or more, a swelling ratio of 30% or less, a gel fraction of 95% or more, and a density. May be 1.3 to 1.4.
  • the polyester film may have a haze change rate ( ⁇ H) according to Equation 11 below 0.1%.
  • the present invention is a skin layer composition
  • a first polyester resin having an oligomer content of 0.3 ⁇ 0.6% by weight of polyester resin, 0.1 ⁇ 1.2% by weight of diethylene glycol, and intrinsic viscosity Melt extruding the second polyester resin for the substrate layer satisfying the following;
  • Ns is the intrinsic viscosity of the polyester resin constituting the skin layer
  • Nc is the intrinsic viscosity of the polyester resin constituting the base layer.
  • TDr means the relaxation ratio in the width direction (TD)
  • the relaxation ratio (%) ⁇ (maximum width of the width direction of the film before the relaxation section-minimum width of the width direction of the film in the relaxation section ) / The maximum width of the film before the relaxation section ⁇ ⁇ 100.
  • the skin layer composition in step a) may include less than 100ppm inorganic particles.
  • the inorganic particles may have an average particle diameter of less than 3 ⁇ m.
  • the heat shrinkage satisfies the following formula 1 to formula 2
  • the surface orientation coefficient (ns) satisfies the following formula 8
  • the haze of a film can satisfy following formula 9.
  • the plane orientation coefficient (ns) ⁇ (length direction refractive index + width direction refractive index) / 2 ⁇ - ⁇ (length direction thickness refractive index + width direction thickness refractive index) / 2 ⁇ ,
  • Hf is the haze of the film after holding at 150 ° C. for 30 minutes
  • Hi is the haze of the film before heating.
  • MDr means the relaxation ratio in the machine direction
  • the relaxation ratio (%) (travel speed of the film in the relaxation section-running speed of the film before the relaxation section) / running speed of the film before the relaxation section ⁇ 100.
  • Polyester film according to the present invention has the effect that the outflow of the oligomer is completely blocked at high temperature conditions.
  • the polyester film according to the present invention has an optical property suitable for use in heat-resistant film for ITO protection, etc. of the touch panel film, the heat shrinkage of the film width is controlled so that the post-processability, in particular ITO film, ITO heat-resistant protective film, Securing processability in the lamination process of three or more films, such as an interference pattern polyester film, is easy.
  • the oligomer means a dimer, trimer, tetramer, etc. having a weight average molecular weight of about 500 to 10,000.
  • polyester film according to the present invention includes a polyester base film made of a polyester resin, and a primer layer formed by applying a water-dispersible resin composition having an oligomer barrier property on one or both sides thereof, %) May satisfy the following Formulas 1 to 4.
  • Smd, Std, Vmd and Vtd means the heat shrinkage (%) of the film measured in accordance with JIS C-2318 standard after maintaining the polyester film of 10cm in width, 10cm in length for 30 minutes at 150 °C,
  • the heat shrinkage percentage (%) (length of film before heat treatment-length of film after holding at 150 ° C. for 30 minutes) / length of film before heat treatment ⁇ 100,
  • Smd means the shrinkage rate (%) in the machine direction (MD) of the film
  • Std means the shrinkage rate (%) in the width direction (TD) of the film
  • Vmd is 10 samples selected at 50cm intervals based on the full width of the film It means the deviation (%) of the heat shrinkage in the machine direction
  • Vtd means the deviation (%) of the heat shrinkage in the width direction of 10 samples selected at 50cm intervals based on the film full width.
  • the polyester film according to an embodiment of the present invention may satisfy Equations 1 and 2, satisfy Equations 3 and 4, or satisfy Equations 1 to 4 in Equations 1 to 4 above. These physical conditions can be combined with other conditions.
  • the heat shrinkage percentage (%) in the machine direction (MD) of the film is 0 to 1.5%, preferably 0.2 to 1.5%, more preferably 0 to 1.0%. If the thermal shrinkage percentage (%) of the machine direction (MD) of the film is less than 0%, the film expands, which increases the likelihood of curling in the post process, and in the case of more than 1.5%, the shrinkage of the machine direction in the post process increases. This can increase the likelihood of occurrence. More preferably, it may be 0 to 0.9%.
  • the thermal contraction rate (%) in the width direction (TD) may be 0 to 1.0%, preferably 0 to 0.5%.
  • the thermal contraction percentage (%) of the width direction (TD) is less than 0%, expansion of the film occurs in the width direction, and when it exceeds 1.0%, the width direction shrinkage may be increased in a later process, and thus curl control may be difficult. More preferably, it is 0 to 0.4%.
  • polyester film may include those that satisfy the following formula 5 to formula 7.
  • S (45) refers to the diagonal shrinkage (%) at a 45 ° angle clockwise relative to the film width direction (TD)
  • S (135) is a clock based on the film width direction (TD) Refers to the diagonal shrinkage in% at an angle of 135 °.
  • the polyester film can maximize the heat shrinkage of the oligomer under high temperature conditions by adjusting the heat shrinkage in the diagonal direction.
  • the synergistic effect of the physical properties including the optical properties of the polyester film can be implemented.
  • the thermal contraction rate at an angle of 45 ° clockwise relative to the width direction TD of the film, which is the diagonal direction of the polyester film, and 135 ° clockwise relative to the width direction TD of the film is preferably 0. ⁇ 1.0%.
  • the absolute value of the difference in thermal shrinkage in the two diagonal directions may be preferably 0.2% or less. If the absolute value of the difference in the diagonal heat shrinkage exceeds 0.2%, a curl that curls in a diagonal direction may be generated as the balance that shrinks in the diagonal direction is broken.
  • the uniformity of the heat shrinkage rate can be ensured in the range where the deviation of the heat shrinkage rate is ⁇ 0.2% with respect to the film full width, and the curl control can be easily performed.
  • Polyester film according to an embodiment of the present invention can satisfy the following formula 8 and formula 9.
  • ns ⁇ (length-direction refractive index + width-direction refractive index) / 2 ⁇ - ⁇ (length-direction thickness refractive index + width-direction thickness refractive index) / 2 ⁇ , and means a plane orientation coefficient.
  • the Hf is the haze of the film after maintaining for 30 minutes at 150 °C
  • Hi represents the haze of the film before heating.
  • the plane orientation coefficient of the polyester film according to an embodiment of the present invention may be preferably 0.1590, more preferably 0.1590 ⁇ 0.1610. If the plane orientation coefficient is less than 0.1590, the surface structure of the film may not be dense, and thus surface migration of the oligomer may easily occur.
  • the haze is used to determine the outflow of the oligomer under high temperature conditions.
  • the haze is out of the range of Equation 9
  • the haze is severe and the haze is reduced.
  • the range that satisfies the haze range since it does not significantly affect post-processability, it has physical properties suitable for use as an optical film.
  • the polyester film according to an embodiment of the present invention may include a polyester base film including a base layer and a skin layer in which at least two layers are laminated on both surfaces of the base layer.
  • the oligomer content of the polyester resin constituting the skin layer may be 0.3 to 0.6% by weight
  • the content of diethylene glycol may be 0.1 to 1.2% by weight.
  • the polyester base film may be formed of three or more layers including a base layer, a skin layer in which at least two or more layers are laminated on both sides of the base layer, and may be formed by coextrusion.
  • Equation 10 In order to improve workability when the base layer and the skin layer are coextruded, it is preferable that the following Equation 10 is satisfied.
  • Ns is the intrinsic viscosity of the polyester resin constituting the skin layer
  • Nc is the intrinsic viscosity of the polyester resin constituting the base layer.
  • the intrinsic viscosity ratio of the skin layer and the base layer is more than 1.2, the problem of interfacial instability may occur due to coextrusion, so that the multilayer structure may not be formed, and it is preferable to satisfy the above range, more preferably 1.0 to 1.05. It is effective to improve workability.
  • the polyester base film preferably has a total thickness of 25 to 250 ⁇ m, more preferably 50 to 188 ⁇ m. If the thickness is less than 25 ⁇ m does not implement the mechanical properties suitable for the optical film, if the thickness is greater than 250 ⁇ m may cause a problem that the thickness of the film is not suitable for thinning of the display device.
  • the content of the base layer is 70 to 90% by weight of the entire film
  • the content of the skin layer is preferably 10 to 30% by weight, more preferably the content of the base layer is 70 to 80% by weight
  • the skin layer The content of 20 to 30% by weight is effective because of excellent interfacial stability during coextrusion and excellent barrier property of the oligomer.
  • the base material layer which consists of said polyester resin consists of polyethylene terephthalate (PET) resin alone.
  • PET polyethylene terephthalate
  • the polyethylene terephthalate resin used is preferably used having an intrinsic viscosity of 0.5 to 1.0, more preferably 0.60 to 0.80.
  • the intrinsic viscosity of the substrate layer polyethylene terephthalate resin is less than 0.5, the heat resistance may be reduced. If the base layer is more than 1.0, it may not be easy to process the raw material, thereby reducing workability.
  • Skin layer formed by co-extrusion of at least two or more layers on both sides of the polyester base layer has an oligomer content of 0.3 to 0.6% by weight, more preferably 0.4 to 0.6% by weight based on the total film weight, diethylene glycol (DEG ) Is preferably 0.1 to 1.1% by weight, more preferably 0.7 to 1.1% by weight.
  • DEG diethylene glycol
  • the polyester resin of the skin layer may be prepared by a synthetic method known in the art in order to have a content of the oligomer and diethylene glycol in the above range, in particular, that is prepared by the solid-phase polymerization of the oligomer and diethylene glycol Effective in reducing the content.
  • the intrinsic viscosity of the polyester resin of the skin layer is preferably 0.6 to 1.0, more preferably 0.65 to 0.85.
  • the heat resistance may be reduced, and if it is more than 1.0, it may not be easy to process the raw material, thereby reducing workability.
  • the polyester film according to an embodiment of the present invention includes a primer layer having a Tg of 60 ° C. or more, a swelling ratio of 30% or less, a gel fraction of 95% or more, and a density of 1.3 to 1.4. can do. This may lower the heat shrinkage rate while controlling the migration of the oligomer during polyester film production.
  • the haze (Haze) change before and after 60 minutes at 150 °C satisfies the physical properties of 0.1% or less, and satisfies the thermal shrinkage of the film to be achieved in the present invention Can be.
  • the haze change rate according to the following formula 11 in a range in which the physical properties of the primer layer satisfy the properties of T g of 60 ° C. or more, swelling ratio of 30% or less, gel fraction of 95% or more, and density of 1.3 or more. ( ⁇ H) can satisfy the physical properties of 0.1% or less.
  • Hf is the haze of the film after holding at 150 ° C. for 60 minutes
  • Hi is the haze of the film before heating.
  • the physical property of the primer layer is T g is 60 °C or more, more specifically 60 °C or more and the upper limit is not limited, the swelling ratio is 30% or less, more specifically 0% ⁇ 30%, Gel fraction 95 % Or more, more specifically 95 to 100%, density is 1.3 or more, and more specifically, in the range of satisfying the physical properties of 1.3 to 1.4, the structural density of the coating film and the mobility of the primer layer are lowered. And even if the pressure was applied it was confirmed that the oligomer in the polyester film does not migrate to the surface.
  • the primer layer may be formed by applying a water-dispersible resin composition having oligomer barrier properties.
  • a water dispersible resin composition comprising an acrylic resin copolymerized with a glycidyl group-containing radical polymerizable unsaturated monomer and a water dispersible polyester resin may be used.
  • the solids content of the water-dispersible polyester resin (B) is less than 20% by weight and the solids content of the acrylic resin (A) copolymerized with the glycidyl group-containing radically polymerizable unsaturated monomer is greater than 80% by weight, As particle size increases, staining occurs during inline coating, adhesion and transparency with polyester base film decreases, and the solid content of water-dispersible polyester resin (B) is over 80% by weight, and glycy When the solid content of the acrylic resin (A) copolymerized with a dill-containing radically polymerizable unsaturated monomer is less than 20% by weight, sufficient oligomer blocking effect cannot be expressed.
  • the water-dispersible resin composition of the present invention may be prepared by mixing a water-dispersible polyester resin (B) and a binder resin mixed with an acrylic resin (A) copolymerized with a glycidyl group-containing radically polymerizable unsaturated monomer, It is also possible to polymerize and produce the glycidyl group-containing radically polymerizable unsaturated monomer alone or the radically polymerizable unsaturated monomer copolymerizable with the glycidyl group-containing radical polymerizable unsaturated monomer in an aqueous dispersion of the water-dispersible polyester resin (B). At this time, surfactant and a polymerization initiator can be used.
  • the surfactant and the polymerization initiator may be used without limitation as long as it is conventionally used in emulsion polymerization.
  • anionic surfactants, nonionic surfactants or non-reactive surfactants can be used, and these can also be used in combination.
  • the polymerization initiator is a radically polymerizable initiator, and nitrogen compounds such as a peroxide initiator or azobis isobutyronitrile can be used.
  • the water dispersion composition of the present invention may further include an antifoaming agent, a wetting agent, a surfactant, a thickener, a plasticizer, an antioxidant, a UV absorber, a preservative, a crosslinking agent and the like as necessary.
  • the water-dispersible polyester-based resin (B) may be a copolymer of a dicarboxylic acid component containing a sulfonic acid alkali metal salt compound and a glycol component containing diethylene glycol.
  • the dicarboxylic acid component an aromatic dicarboxylic acid and a sulfonic acid alkali metal salt compound may be used, and the sulfonic acid alkali metal salt compound may contain 6 to 20 mol% of the total acid component.
  • the dicarboxylic acid component is an aromatic dicarboxylic acid such as phthalic acid, terephthalic acid, dimethyl terephthalate, isophthalic acid, dimethyl isophthalic acid, 2,5-dimethyl terephthalic acid, 2,6-naphthalene dicarboxylic acid and biphenyldicarboxylic acid.
  • aromatic dicarboxylic acids such as an acid, adipic acid, a sebacic acid, alicyclic dicarboxylic acids, such as cyclohexane dicarboxylic acid, etc. can be used.
  • the sulfonic acid alkali metal salt compound include alkali metal salts such as sulfoterephthalic acid, 5-sulfo isophthalic acid, 4-sulfo isophthalic acid, 4-sulfo naphthalic acid-2,7-dicarboxylic acid, and the like. It is preferable to use 6-20 mol%. When using less than 6 mol%, the dispersion time of resin to water becomes long, dispersibility is low, and when it uses more than 20 mol%, water resistance may fall.
  • glycol component diethylene glycol and aliphatic glycols having 2 to 8 carbon atoms or alicyclic glycols having 6 to 12 carbon atoms may be used.
  • ethylene glycol, 1,3-propanediol, 1,2-propylene glycol, neopentyl glycol, 1,4-butanediol, 1,4-cyclohexanedimethanol, 1,3-cyclohexanedimethanol , 1,2-cyclohexanedimethanol, 1,6-hexanediol, P-xylene glycol, triethylene glycol and the like can be used.
  • the number average molecular weights of the said water-dispersible polyester resin (B) are 1000-50000, More preferably, the number average molecular weights are 2000-30000. When the number average molecular weight is less than 1000, the oligomer blocking effect is insignificant, and when the number average molecular weight is more than 50000, water dispersibility may be difficult.
  • the water-dispersible polyester-based resin (B) is used by uniformly dispersing by heating and stirring the water or water containing an aqueous solvent at 50 ⁇ 90 °C.
  • the aqueous dispersion thus prepared has a solid content of 30 wt% or less, more preferably 10 to 30 wt%, for uniform dispersion.
  • the aqueous solvent may be alcohols such as methanol, ethanol, propanol, polyhydric alcohols such as ethylene glycol, propylene glycol, diethylene glycol, dipropylene glycol, glycerin, and the like.
  • Acrylic resin (A) copolymerized with a glycidyl group-containing radically polymerizable unsaturated monomer is a homopolymer of a glycidyl group-containing radically polymerizable unsaturated monomer or another radically polymerizable unsaturated monomer copolymerizable with a glycidyl group-containing radically polymerizable unsaturated monomer. It is resin copolymerized.
  • the acrylic resin may be a copolymer monomer containing 20 to 80 mol% of the glycidyl group-containing radical polymerizable unsaturated monomer in all monomer components. Since the glycidyl group-containing radically polymerizable unsaturated monomer improves the strength of the coating film of the primer layer by the crosslinking reaction and increases the crosslinking density, it is possible to block the outflow of the oligomer.
  • glycidyl ethers such as glycidyl acrylate, glycidyl methacrylate, and arylglycidyl ether can be used.
  • Radical polymerizable unsaturated monomers copolymerizable with glycidyl group-containing radical polymerizable unsaturated monomers include vinyl esters, unsaturated carboxylic acid esters, unsaturated carboxylic acid amides, unsaturated nitriles, unsaturated carboxylic acids, allyl compounds, nitrogen-containing vinyl monomers and hydrocarbon vinyl monomers. Or a vinyl silane compound. Vinyl propionate, vinyl stearate, vinyl chloride, etc. can be used as vinyl ester.
  • Unsaturated carboxylic acid esters include methyl acrylate, ethyl acrylate, butyl acrylate, 2-ethylhexyl acrylate, ethyl methacrylate, butyl methacrylate, butyl maleate, octyl maleate, butyl fumarate, octyl fumarate, hydroxyethyl methacrylate, Hydroxyethyl acrylate, methacrylate hydroxypropyl, hydroxypropyl acrylate and the like can be used.
  • unsaturated carboxylic acid amide acrylamide, methacrylamide, metyrolacrylamide, butoxy methirol acrylamide, and the like can be used. Acrylonitrile etc.
  • unsaturated nitrile can be used as unsaturated nitrile.
  • unsaturated carboxylic acid acrylic acid, methacrylic acid, maleic acid, fumaric acid, itaconic acid, maleic acid acid ester, fumaric acid acid ester, itaconic acid acid ester and the like can be used.
  • allyl compound allyl acetate, allyl methacrylate, allyl acrylate, allyl itaconic acid, diallyl itaconic acid and the like can be used.
  • Vinylpyridine, vinyl imidazole, etc. can be used as a nitrogen-containing vinyl monomer.
  • hydrocarbon vinyl monomer ethylene, propylene, hexene, octene, styrene, vinyltoluene, butadiene and the like can be used.
  • vinyl silane compound dimethyl vinyl methoxy silane, dimethyl vinyl ethoxy silane, methyl vinyl dimethoxy silane, methyl vinyl diethoxy silane, gamma-methacryloxy propyl trimethoxy silane, gamma-methacryloxy propyl dimethoxy silane, etc. Can be used.
  • Water-dispersible resin composition is a water content of 0.5 to 10% by weight of the solid content of the acrylic resin (A) and the water-dispersible polyester resin (B) copolymerized with a glycidyl group-containing radically polymerizable unsaturated monomer It is preferably an acidic or water soluble composition. More specifically, the solid content of the acrylic resin (A) and the water-dispersible polyester resin (B) copolymerized with the glycidyl group-containing radically polymerizable unsaturated monomer is 0.5 to 10% by weight, and the remainder includes water. It may further include additives such as a wetting agent, a dispersing agent. The wetting agent is used to improve the coating property.
  • a modified silicone wetting agent such as Dow Corning's Q2-5212, ENBODIC's TEGO WET 250, BYK CHEMIE's BYK 348, etc. may be used. It doesn't happen.
  • Wetting agent is preferably used in 0.1 to 0.5% by weight, it is possible to achieve the desired coating properties in the above range.
  • the primer layer may be a dry coating thickness of 20 ⁇ 150nm. If the dry coating thickness is less than 20nm, the oligomer blocking properties may not be sufficiently exhibited. If the dry coating thickness is greater than 150nm, coating stains may appear, and a blocking phenomenon of sticking primer layers after the winding of the film may increase.
  • the water-dispersible resin composition may be applied by an in-line coating method of the polyester film manufacturing process.
  • the polyester base film may be prepared by applying an in-line coating method before stretching or before the second stretching after the primary stretching, or by stretching. Water is evaporated by heating during the secondary stretching and heat setting. Layers can be formed.
  • the coating method is not limited as long as it is a known coating method.
  • a primer layer by applying a water-dispersible resin composition having oligomer barrier properties to one or both surfaces of the uniaxially stretched polyester base film;
  • the relaxation ratio (%) (travel speed of the film in the relaxation section-travel speed of the film before the relaxation section) / running speed of the film before the relaxation section ⁇ 100.)
  • the relaxation of the machine direction (MD) may be performed in a temperature range satisfying the following equation (13).
  • the oligomer after stretching as described above, by performing heat setting and relaxation in the machine direction, and performing the conditions in the conditions satisfying the above formulas 9 and 10 during relaxation, the oligomer does not migrate under high temperature conditions, the shrinkage of the film Since this does not occur, it is possible to produce a film advantageous for the post-process.
  • the step a) is a polyester chip into an extruder and melt extrusion and then quenched and solidified in a casting drum to produce a polyester sheet, which is then machined at 80 ⁇ 100 °C It is a step of performing uniaxial stretching in the direction MD. At this time, the stretching ratio is preferably 2 to 4 times.
  • Step b) is a process of coating the water-dispersible resin composition on the uniaxially stretched polyester base film, it can be coated using a method known to those skilled in the art.
  • Step c) is a process of performing biaxial stretching in the width direction (TD) of the polyester base film on which the primer coating layer is formed, preferably stretching 2 to 4 times at 110 to 150 ° C.
  • Step d) is a process of performing heat setting and relaxation
  • step d) may be performed in a tenter.
  • the heat setting temperature may be carried out at 200 ⁇ 240 °C, the temperature at the time of relaxation is preferably performed in the range satisfying the following equation (13).
  • the relaxation may be performed by using the MD Relax facility in the machine direction (MD direction), and may be performed by changing a passing path to the Clip in the width direction (TD direction).
  • MD Relax facility can control the shrinkage performance in the MD direction in the future by providing a speed difference of about 1.1% to 2.5% between nine rails after the heat treatment period. Preferably a speed difference of 1.2 to 2.0%, more preferably 1.25 to 2.0% is good.
  • the heat shrinkage rate in the MD direction at 150 ° C. and 30min standing conditions is in the range of 0 to 1.0%, more preferably in the range of 0.3 to 0.9%.
  • the heat shrinkage in the TD direction under the above conditions is in the range of 0 to 0.5%, more preferably in the range of 0.0 to 0.4%.
  • the deviation of the thermal contraction rate is within ⁇ 0.2% of the MD / TD direction based on the master roll full width reference.
  • the skin layer may include inorganic particles, it is preferable to use so that the initial haze of the film satisfies the range of less than 1.5% haze. Moreover, it is preferable that the surface roughness of a film is 10 nm or less. If the surface roughness exceeds 10nm may result in smoothness of the final product after hard coating.
  • the inorganic particles may be any particles used in the film, such as silica, zeolite and kaolin. These inorganic particles come out to the surface of the film through the stretching process to improve the slip properties and winding properties of the film.
  • the particle size is 3 ⁇ m or more, even if the particle content is 100 ppm or less, the transparency of the film is much lowered, and the roughness (Ra) is lowered to 10 nm or more, so that it is difficult to use for optical, especially for the touch panel.
  • the particle content is 100ppm or more
  • the transparency of the film is lowered, which is not suitable for the touch panel.
  • the haze is 1.5% or more, the transparency and the light transmittance drop sharply when used for the optical and the touch panel, and it is difficult to use the optical for the BLU evaluation with the naked eye.
  • the production of the polyester multilayer film including the base layer and the skin layer of the present invention is not limited, but may be obtained by extrusion fusion and casting by biaxial stretching in at least two melt extruders.
  • one extruder is used to extrude polyester, and another extruder is melt extruded simultaneously with additives such as polyester, inorganic particles such as silica, kaolin, and zeolite, and each melt is coextruded in the feed block. After casting, casting, cooling and then biaxial stretching in sequence.
  • the polyester film is formed of:
  • a skin layer composition comprising a first polyester resin having an oligomer content of 0.3 to 0.6% by weight and a diethylene glycol content of 0.1 to 1.2% by weight, and an intrinsic viscosity satisfying Melting and extruding the second polyester resin for the base layer;
  • Ns is the intrinsic viscosity of the polyester resin constituting the skin layer
  • Nc is the intrinsic viscosity of the polyester resin constituting the base layer.
  • TDr means the relaxation ratio in the width direction (TD)
  • the relaxation ratio (%) ⁇ (maximum width of the width direction of the film before the relaxation section-minimum width of the width direction of the film in the relaxation section ) / The maximum width of the film before the relaxation section ⁇ ⁇ 100.
  • the oligomer after stretching as described above, by performing heat setting and longitudinal relaxation, and performing the conditions in the condition that satisfies Equation 6 at the time of relaxation, the oligomer does not migrate under high temperature conditions, the shrinkage of the film occurs Since it is not possible to produce a film advantageous for the post-process.
  • step a) is a step of preparing a polyester sheet by co-extrusion of a polyester resin constituting the base layer and the skin layer, followed by quenching and solidifying with a casting drum. It is preferable that the intrinsic viscosity of the polyester resin used for a layer and a base material layer is a range which satisfy
  • Ns is the intrinsic viscosity of the polyester resin constituting the skin layer
  • Nc is the intrinsic viscosity of the polyester resin constituting the base layer.
  • step b) is a step of stretching the coextruded sheet into a film, which may be uniaxially or biaxially stretched, and preferably biaxially stretched.
  • uniaxial stretching is performed in the longitudinal direction (MD) at 80 to 100 ° C, and the stretching ratio is preferably 2 to 4 times.
  • TD width direction
  • Step c) is a process of performing heat setting and relaxation
  • step d) may be performed in a tenter.
  • the heat setting temperature may be performed at 200 to 240 ° C.
  • the thermal contraction rate may be controlled by performing the relaxation rate in the width direction during relaxation to satisfy Equation 14 below.
  • TDr means the relaxation ratio in the width direction (TD)
  • the relaxation ratio (%) ⁇ (maximum width of the width direction of the film before the relaxation section-minimum width of the width direction of the film in the relaxation section ) / The maximum width of the film before the relaxation section ⁇ ⁇ 100.
  • MDr means the relaxation ratio in the machine direction
  • the relaxation ratio (%) (travel speed of the film in the relaxation section-travel speed of the film before the relaxation section) / travel speed of the film before the relaxation section ⁇ 100.)
  • the shrinkage ratio of the film after maintaining for 30 minutes at 150 ° C can satisfy the equations (1) and (2).
  • Hard coating layer, pressure-sensitive adhesive layer, light diffusing layer, ITO layer, printing layer, etc. may be formed on the polyester film of the present invention, and even after heating the functional coating layer, the outflow of the oligomer is blocked to provide optical properties. Since it can be maintained, the polyester film of this invention is suitable for use as an optical film.
  • the physical properties were measured by the following measurement method.
  • the dimension change after leaving for 30 minutes in the hot air oven in which the conditions of 150 degreeC conditions are maintained is measured according to JIS C-2318 standard.
  • the film is measured at 50cm intervals with respect to the full width roll, and the dimensional change is measured in the clockwise 45 degree direction and 135 degree direction in the MD direction, the TD direction, and the TD direction, respectively.
  • Thermal shrinkage (%) (length of film before heat treatment-length of film after holding at 150 ° C. for 30 minutes) / length of film before heat treatment ⁇ 100
  • C represents the concentration of the sample.
  • oligomer By quantitative method, chloroform is added to HFIP (1,1,1,3,3,3-hexafluoro-2-propanol) as a sample solvent to dissolve at room temperature, and then acetonitrile is precipitated as a polymer. Then, the calibration curve of the standard material (cyclic oligomer) is prepared by using LC analysis equipment, and the cyclic oligomer purity is determined through sample analysis. As analytical equipment, LC (liquid chromatography) and Agilent's 1100 series were used.
  • Diethylene Glycol (DEG) content is 1 g of a sample in a 50 mL container, 3 mL of monoethanolamine is added and heated using a hot plate to completely dissolve the sample, then cooled to 100 °C 1
  • a solution of 0.005 g of 6-hexanediol dissolved in 20 mL of methanol was added, followed by neutralization by addition of 10 g of terephthalic acid.
  • the obtained neutralized liquid was filtered using a funnel and filter paper, and the filtrate was subjected to gas chromatography (Gas Chromatography) to measure the DEG content (% by weight).
  • GC analysis was measured using a Shimadzu GC analyzer and in accordance with the Shimazu GC manual.
  • Specimens of the film formed were measured according to JIS K 715 using a HAZE METER (model name: Nipon denshoku, Model NDH 5000).
  • the film was placed in a box having a height of 3 cm, a width of 21 cm, and a height of 27 cm, and heat-treated at 150 ° C. for 60 min to migrate the oligomer to the film surface, and to leave for 5 min.
  • the value was measured using HAZE METER (Nipon denshoku, Model NDH 5000) according to JIS K 715 standard.
  • the haze change amount was calculated according to the following formula (11).
  • Hf is the haze of the film after holding at 150 ° C. for 60 minutes
  • Hi is the haze of the film before heating.
  • the cross section of the film was measured by SEM (Hitachi S-4300) by designating 5 points at 1m intervals in the vertical direction (TD) of the machine direction to which the coating composition was coated. The average value was calculated after 30 point measurement.
  • Ra center line roughness
  • the refractive index in the longitudinal direction, width direction and thickness direction is measured and calculated as follows.
  • Plane orientation coefficient (ns) ⁇ (lengthwise refractive index + widthwise refractive index) / 2 ⁇ - ⁇ (lengthwise thickness refractive index + widthwise refractive index / 2 ⁇
  • 2nd Run. -40 degreeC-200 degreeC, and it measures on 20 degree-C / min conditions.
  • the film is cut to a size of A4 size (width 29.7 cm, length 21.0 cm) in the width direction. Then, the dimensional change after standing for 12 hours in a hot air oven in which the condition of 80 ° C is maintained is measured. Dimensional changes are measured for the height of the four corners of the A4 film off the floor.
  • Curl occurrence was determined as no curl when the height from the bottom to the edge of the film is 3mm or less.
  • binder resins used in the following Examples and Comparative Examples are as follows.
  • the acrylic resin contains 50 mol% of the glycidyl group-containing radical polymerizable unsaturated monomer as a copolymerization monomer in all monomer components,
  • the water-dispersible polyester resin contains 50 mol% of diethylene glycol in the total glycol component and 10 mol% of the sulfonic acid alkali metal salt compound in the total acid component.
  • Rohm & Haas Co., Ltd. a binder containing 40% by weight of methyl methacrylate, 40% by weight of ethyl acrylate and 20% by weight of melamine.
  • the acrylic resin (A) was a copolymer of 60 mol% glycidyl acrylate and 40 mol% vinyl propionate, and a weight average molecular weight of 35000 was used.
  • the water-dispersible polyester-based resin (B) is 50 mol% of sulfoterephthalic acid and 85 mol% of terephthalic acid with respect to 50 mol% of diethylene glycol and 50 mol% of ethylene glycol 50 mol%.
  • As the resin polymerized using a weight average molecular weight of 14000 was used.
  • a water-dispersible resin composition (1) having a total solid content of 0.8 wt%.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded. Is 0.67, the diethylene glycol content of 0.8% by weight, the oligomer content of the polyethylene terephthalate chip prepared by the solid phase polymerization of 0.5% by weight, the silica particles with a particle size of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A.
  • the prepared water-dispersible resin composition (1) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 80 wt% of the total film weight, the skin layer was 20 wt% of the total film weight, and the dry coating thickness of the primer layer of the composition was 20 nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • a binder having a solid content weight ratio of acrylic resin (A) copolymerized with a glycidyl group-containing radical polymerizable unsaturated monomer and a water-dispersible polyester resin (B) (A) / (B) 70/30 was used.
  • the acrylic resin (A) was a copolymer of 60 mol% glycidyl acrylate and 40 mol% vinyl propionate, and a weight average molecular weight of 30000 was used.
  • the water-dispersible polyester-based resin (B) is 50 mol% of sulfoterephthalic acid and 85 mol% of terephthalic acid with respect to 50 mol% of diethylene glycol and 50 mol% of ethylene glycol 50 mol%.
  • As the resin polymerized using a weight average molecular weight of 12000 was used.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded.
  • the prepared water-dispersible resin composition (1) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 80 wt% of the total film weight, the skin layer was 20 wt% of the total film weight, and the dry coating thickness of the primer layer of the composition was 20 nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded.
  • the prepared water-dispersible resin composition (2) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 80% by weight of the total film weight, the skin layer was 20% by weight of the total film weight, the dry coating thickness of the primer layer of the composition was 110nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded. Is 0.67, the diethylene glycol content of 0.8% by weight, the oligomer content of 0.4% by weight of polyethylene terephthalate chip prepared by solid phase polymerization, the silica particles with a particle size of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A.
  • the prepared water-dispersible resin composition (1) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 80 wt% of the total film weight, the skin layer was 20 wt% of the total film weight, and the dry coating thickness of the primer layer of the composition was 20 nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded. Is 0.67, the diethylene glycol content of 0.8% by weight, the oligomer content of 0.4% by weight of polyethylene terephthalate chip prepared by solid phase polymerization, the silica particles with a particle size of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A.
  • the prepared water-dispersible resin composition (2) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 80% by weight of the total film weight, the skin layer was 20% by weight of the total film weight, the dry coating thickness of the primer layer of the composition was 110nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded. Is 0.67, the diethylene glycol content of 0.8% by weight, the oligomer content of the polyethylene terephthalate chip prepared by the solid phase polymerization of 0.5% by weight, the silica particles with a particle size of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A.
  • the prepared water-dispersible resin composition (1) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 70% by weight of the total film weight, the skin layer was 30% by weight of the total film weight, and the dry coating thickness of the primer layer of the composition was 20 nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded. Is 0.67, the diethylene glycol content of 0.8% by weight, the oligomer content of the polyethylene terephthalate chip prepared by the solid phase polymerization of 0.5% by weight, the silica particles with a particle size of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A.
  • the prepared water-dispersible resin composition (2) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 70% by weight of the total film weight, the skin layer was 30% by weight of the total film weight, and the dry coating thickness of the primer layer of the composition was 110nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded. Is 0.67, the diethylene glycol content of 0.8% by weight, the oligomer content of the polyethylene terephthalate chip prepared by the solid phase polymerization of 0.5% by weight, the silica particles with a particle size of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A. Thereafter, the temperature was increased by 1 ° C.
  • the prepared polyester multilayer film was 80% by weight of the total film weight, the skin layer was 20% by weight of the total film weight.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyethylene terephthalate having an intrinsic viscosity of 0.65, a diethylene glycol content of 1.2% by weight, and an oligomer content of 1.4% by weight was added to an extruder, and melted and extruded.
  • a polyethylene terephthalate chip of 0.67, diethylene glycol content of 0.8% by weight, oligomer content of 1.4% by weight of the solid phase polymerization, and silica particles having a particle diameter of 0.7 ⁇ m 50ppm relative to the total weight of polyethylene terephthalate Using to prepare a sheet co-extruded to three layers of A / B / A.
  • the prepared water-dispersible resin composition (1) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and then 3.5 times in the transverse direction (TD). Stretched. Thereafter, heat treatment was performed at 230 ° C. in a 5-stage tenter, followed by heat setting at 10 ° C. in the longitudinal and transverse directions at 200 ° C. to prepare a biaxially stretched film of 188 ⁇ m coated on both sides.
  • the prepared polyester multilayer film was 80 wt% of the total film weight, the skin layer was 20 wt% of the total film weight, and the dry coating thickness of the primer layer of the composition was 20 nm.
  • the physical properties of the polyester film thus obtained are shown in Table 2 below.
  • polyester-based polyol polyethylene adipate diol having a weight average molecular weight of 1000
  • reactive emulsifier having an ionic group Asahi Denka, polyoxy ethylene allyl glycidyl nonyl phenyl ether
  • An aqueous polyurethane binder having a solid content of 20% by weight was prepared by reacting 1% by weight of adecaria shop SETM), which is a sulfonic acid ester, and 80% by weight of water.
  • Example 1 Table 1 division Layer composition Chip raw material composition Water dispersion resin composition Skin layer composition Core layer composition Base layer (% by weight) Skin layer (wt%) Intrinsic viscosity DEG (% by weight) Oligomer (% by weight) Intrinsic viscosity DEG (% by weight) Oligomer (% by weight) Tg (°C) Gel fraction Swell ratio density
  • Example 1 80 20 0.67 0.8 0.5 0.65 1.2 1.4 67 96 7 1.311
  • Example 2 80 20 0.67 0.8 0.5 0.65 1.2 1.4 67 96 7 1.311
  • Example 3 80 20 0.67 0.8 0.5 0.65 1.2 1.4 67 96 7 1.311
  • Example 4 80 20 0.67 0.8 0.5 0.65 1.2 1.4 67 96 27 1.368
  • Example 5 80 20 0.67 0.8 0.5 0.65 1.2 1.4 67 96 7 1.311
  • Example 6 80 20 0.67 0.8 0.4 0.65 1.2 1.4 67 96 7 1.368
  • Example 7
  • the polyester multilayer film according to the present invention exhibits characteristics suitable for use as an optical film due to a low haze change rate before and after heat treatment.
  • Comparative Example 1 was found that the haze change rate is high only by improving the polymerized chip of the base film without the primer coating treatment, a large amount of oligomers in the process of laminating with other films in the subsequent process does not satisfy the properties of the present invention As can be seen, in the case of Comparative Example 2, as the oligomer content of the skin layer is 1.4%, it can be confirmed that the haze is out of the required physical property range. In Comparative Examples 3, 4, and 5, it was confirmed that the haze change rate was affected by the composition of the primer layer.
  • a silicone wetting agent Dow Corning, polyester siloxane copolymer, Q2-5212
  • 16 wt% of KLX-007 binder solid content 25% water dispersion composition
  • colloidal silica particles having an average particle diameter of 140 nm It was added to water and stirred for 2 hours to prepare a water dispersible resin composition (6) having a total solid content of 4.6% by weight.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 7 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 40 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition (8) was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 160 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 245 ° C. in a 5-stage tenter, followed by heat setting to 10% in the width direction at 200 ° C., followed by adjustment of the relaxation rate of the MD Relax facility to 1.25% to form a 125 ⁇ m biaxially stretched film coated on both sides. Prepared.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 237 ° C. in a 5-stage tenter, followed by heat setting to relax 10% in the width direction at 200 ° C., followed by adjusting the relaxation ratio of the MD Relax facility to 2.0% to form a 125 ⁇ m biaxially stretched film coated on both sides. Prepared.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment is performed at 244 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 9 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • the polyethylene terephthalate chip was removed from the moisture in the extruder and melt-extruded, and then quenched and solidified in a casting drum having a surface temperature of 20 °C to prepare a polyethylene terephthalate sheet having a thickness of 1500 ⁇ m.
  • the prepared polyethylene terephthalate sheet was stretched 3.5 times in the machine direction (MD) at 80 ° C. and then cooled to room temperature. Thereafter, the prepared water-dispersible resin composition 6 was coated on both sides by a bar coating method, and then heated to 1 ° C. per second to 110 to 150 ° C., preheated and dried, and 3.5 times in the width direction (TD). Stretched. Thereafter, heat treatment was performed at 235 ° C.
  • the dry coating thickness of the primer coating layer of the composition was 80 nm.
  • the physical properties of the thus obtained polyester film are shown in Tables 3 and 4 below.
  • Example 9 45 0.7 0.7 0.8 0.7 0.6 0.6 0.7 0.8 0.7 0.7 135 0.6 0.6 0.6 0.6 0.6 0.6 0.7 0.6 0.6 Difference 0.1 0.1 0.2 0.1 0 0 0.1 0.1 0.1 Twist Curl occurrence Nil Nil Nil Nil Nil Nil Nil Nil Nil Nil Comparative Example 9 45 0.4 0.7 0.8 0.7 0.6 0.7 0.7 0.7 0.8 0.8 135 0.8 1.0 0.7 0.6 0.7 0.5 0.5 0.5 0.5 Difference 0.4 0.3 0.1 0 0 0 0.2 0.2 0.3 0.3 Twist Curl occurrence Occur Occur Nil Nil Nil Nil Nil Nil Occur Occur
  • the polyester film according to the present invention exhibits excellent characteristics as an optical film due to the low haze change rate before and after heat treatment.
  • Comparative Example 6 it can be seen that affect the haze change rate according to the composition of the primer coating layer. That is, it can be seen that a difference in the degree of oligomer blocking performance may occur through the selection of the composition of the coating layer.
  • the base layer uses a PET chip having an intrinsic viscosity of 0.65, a diethylene glycol (DEG) content of 1.2% by weight, and an oligomer content of 1.4% by weight, and the skin layer has a specific viscosity of 0.67, a DEG content of 0.8% by weight, and an oligomer content.
  • the 0.5% solid-phase polymerized PET chip was used, and the particles having a particle diameter of 0.7 ⁇ m were co-extruded using 30 ppm. Thereafter, the film was sequentially stretched 3.2 times and 3.2 times in the longitudinal and transverse directions, and heat-treated at 230 ° C., thereby giving a 3% widthwise relaxation to prepare a 125 ⁇ m multilayer film. At this time, in the width direction, the three sections of the heat treatment zone inside the tenter were sequentially relaxed at the maximum width after stretching, but the width length was reduced by 3% of the maximum width direction.
  • Particle composition and content of the skin layer are shown in Table 6.
  • the base layer of the multilayer film was 80% by weight of the total film weight
  • the skin layer was 20% by weight of the total film weight was measured oligomer surface migration, surface roughness, haze, surface orientation coefficient, shrinkage of the film after production.
  • the oligomer surface migration, surface roughness, haze, surface orientation coefficient, and shrinkage rate of the film were measured.
  • Example 15 It was carried out in the same manner as in Example 15 by changing only the oligomer content of the raw material of the skin layer as shown in Table 6.
  • the oligomer surface migration, surface roughness, haze, surface orientation coefficient, and shrinkage rate of the film were measured.
  • Example 15 The same procedure as in Example 15 was performed except that only the weight of the skin layer was changed as in Table 6 below.
  • Example 15 was carried out in the same manner as in Example 15 except that only the particle content of the skin layer was changed as shown in Table 6.
  • Example 15 was carried out in the same manner as in Example 15, but at the same time as the relaxation in the width direction to give 1.5% in the longitudinal direction.
  • Example 15 The same procedure as in Example 15 was carried out, except that the skin layer was made of PET having an intrinsic viscosity of 0.65 and an oligomer content of 1.4%, and only particles were used in the skin layer as in Example 16. , Surface orientation coefficient, and shrinkage were measured.
  • Example 15 The same procedure as in Example 15 was performed except that the DEG content of the skin layer was changed as shown in Table 6.
  • the oligomer surface migration, surface roughness, haze, surface orientation coefficient, and shrinkage rate of the film were measured.
  • Example 15 The same procedure as in Example 15 was carried out, except that the oligomer content of the skin layer was changed as shown in Table 6. The oligomer surface migration, surface roughness, haze, plane orientation coefficient, and shrinkage of the film were measured.
  • Example 15 The same process as in Example 15 was performed except that the weight of the skin layer was changed as in Table 6 below.
  • Example 15 was carried out in the same manner as in Example 15 except that only the particle content of the skin layer was changed as shown in Table 6 below.
  • the composition was carried out in the same manner as in Example 16 except that the heat treatment temperature was 200, 210 ° C., and the widthwise relaxation was 1% and 1.5%.
  • the embodiment of the present invention after maintaining for 30 minutes at 150 °C low thermal shrinkage of the film to satisfy the formula 1 and 2, the surface orientation coefficient is 0.1590 or more, the surface roughness It was confirmed that it was 10 nm or less, and the haze (Hi) of the film before heating was less than 1.5%, and it maintained for 150 minutes at 150 degreeC, and the haze of the film satisfy

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  • Health & Medical Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

La présente invention porte sur un film de polyester et sur un procédé pour la fabrication de celui-ci. Plus précisément, la présente invention porte sur un film de polyester qui a d'excellentes caractéristiques optiques et une contraction thermique limitée, qui permet d'éviter la migration d'oligomères lorsqu'il est chauffé et qui peut être utilisé à des fins optiques du fait d'un faible changement de trouble après chauffage ; et sur un procédé pour la fabrication de celui-ci.
PCT/KR2014/005737 2013-06-27 2014-06-27 Film de polyester et son procédé de fabrication WO2014209056A1 (fr)

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CN107267079A (zh) * 2016-03-31 2017-10-20 可隆工业株式会社 聚酯膜
JP2018538162A (ja) * 2015-10-16 2018-12-27 トーレ・フィルムズ・ヨーロッパ 粘着性であり、気体に対して不透過性である改良されたポリエステル／プライマー／金属複合体フィルム、その製造方法、及びかかる方法において用いるプライマー
US10286597B2 (en) * 2015-10-02 2019-05-14 Unitika Ltd. Polyester film, laminate, and method for producing polyester film
KR102052843B1 (ko) * 2019-01-07 2019-12-06 도레이첨단소재 주식회사 편광자 보호용 폴리에스테르 필름과 그 제조방법 및 이를 구비하는 편광판
CN113861475A (zh) * 2021-09-28 2021-12-31 中国科学技术大学 光学显示用聚酯薄膜及其制备方法
CN113861465A (zh) * 2021-09-28 2021-12-31 中国科学技术大学 光学聚酯薄膜及其制备方法
CN114196052A (zh) * 2020-09-16 2022-03-18 南亚塑胶工业股份有限公司 聚酯薄膜及涂液
CN114728498A (zh) * 2019-11-20 2022-07-08 东洋纺株式会社 层叠薄膜

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JP2007253511A (ja) * 2006-03-24 2007-10-04 Toray Ind Inc 積層ポリエステルフィルム及びそれを用いたディスプレイ用部材
JP2009292949A (ja) * 2008-06-05 2009-12-17 Toyobo Co Ltd 成型用延伸ポリエステルフィルム
KR20110051801A (ko) * 2009-11-11 2011-05-18 도레이첨단소재 주식회사 공중합 폴리에스테르 수지를 포함하는 표면 레벨링성이 향상된 이축배향 폴리에스테르 이접착필름
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US10286597B2 (en) * 2015-10-02 2019-05-14 Unitika Ltd. Polyester film, laminate, and method for producing polyester film
JP2018538162A (ja) * 2015-10-16 2018-12-27 トーレ・フィルムズ・ヨーロッパ 粘着性であり、気体に対して不透過性である改良されたポリエステル／プライマー／金属複合体フィルム、その製造方法、及びかかる方法において用いるプライマー
CN107267079A (zh) * 2016-03-31 2017-10-20 可隆工业株式会社 聚酯膜
CN107267079B (zh) * 2016-03-31 2020-07-24 可隆工业株式会社 聚酯膜
KR102052843B1 (ko) * 2019-01-07 2019-12-06 도레이첨단소재 주식회사 편광자 보호용 폴리에스테르 필름과 그 제조방법 및 이를 구비하는 편광판
WO2020145451A1 (fr) * 2019-01-07 2020-07-16 도레이첨단소재 주식회사 Film polyester pour la protection d'un polariseur, son procédé de fabrication et film polarisant le comprenant
CN114728498A (zh) * 2019-11-20 2022-07-08 东洋纺株式会社 层叠薄膜
CN114728498B (zh) * 2019-11-20 2024-01-12 东洋纺株式会社 层叠薄膜
CN114196052A (zh) * 2020-09-16 2022-03-18 南亚塑胶工业股份有限公司 聚酯薄膜及涂液
CN113861465A (zh) * 2021-09-28 2021-12-31 中国科学技术大学 光学聚酯薄膜及其制备方法
CN113861475A (zh) * 2021-09-28 2021-12-31 中国科学技术大学 光学显示用聚酯薄膜及其制备方法
CN113861475B (zh) * 2021-09-28 2022-12-30 中国科学技术大学 光学显示用聚酯薄膜及其制备方法
CN113861465B (zh) * 2021-09-28 2023-06-20 中国科学技术大学 光学聚酯薄膜及其制备方法

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