WO2009091072A1 - ポリエステル樹脂、その製造方法およびそれを用いた二軸配向ポリエステルフィルム - Google Patents
ポリエステル樹脂、その製造方法およびそれを用いた二軸配向ポリエステルフィルム Download PDFInfo
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- WO2009091072A1 WO2009091072A1 PCT/JP2009/050903 JP2009050903W WO2009091072A1 WO 2009091072 A1 WO2009091072 A1 WO 2009091072A1 JP 2009050903 W JP2009050903 W JP 2009050903W WO 2009091072 A1 WO2009091072 A1 WO 2009091072A1
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/02—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds
- C08G63/12—Polyesters derived from hydroxycarboxylic acids or from polycarboxylic acids and polyhydroxy compounds derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/16—Dicarboxylic acids and dihydroxy compounds
- C08G63/18—Dicarboxylic acids and dihydroxy compounds the acids or hydroxy compounds containing carbocyclic rings
- C08G63/181—Acids containing aromatic rings
- C08G63/185—Acids containing aromatic rings containing two or more aromatic rings
- C08G63/187—Acids containing aromatic rings containing two or more aromatic rings containing condensed aromatic rings
- C08G63/189—Acids containing aromatic rings containing two or more aromatic rings containing condensed aromatic rings containing a naphthalene ring
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
- C08G63/00—Macromolecular compounds obtained by reactions forming a carboxylic ester link in the main chain of the macromolecule
- C08G63/66—Polyesters containing oxygen in the form of ether groups
- C08G63/668—Polyesters containing oxygen in the form of ether groups derived from polycarboxylic acids and polyhydroxy compounds
- C08G63/672—Dicarboxylic acids and dihydroxy compounds
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- 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
- C08J3/00—Processes of treating or compounding macromolecular substances
- C08J3/005—Processes for mixing polymers
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T428/00—Stock material or miscellaneous articles
- Y10T428/29—Coated or structually defined flake, particle, cell, strand, strand portion, rod, filament, macroscopic fiber or mass thereof
- Y10T428/2982—Particulate matter [e.g., sphere, flake, etc.]
- Y10T428/2991—Coated
- Y10T428/2993—Silicic or refractory material containing [e.g., tungsten oxide, glass, cement, etc.]
- Y10T428/2995—Silane, siloxane or silicone coating
Definitions
- the present invention relates to a polyester resin copolymerized with 6,6 ′-(alkylenedioxy) di-1-naphthoic acid, a production method thereof, and a biaxially oriented polyester film using the same.
- Aromatic polyesters typified by polyethylene terephthalate and polyethylene 1,6-naphthalate have excellent mechanical properties, dimensional stability and heat resistance, and are widely used in films.
- polyethylene 1,6-naphthalate has mechanical properties, dimensional stability, and heat resistance superior to those of polyethylene terephthalate, so that it can be used in demanding applications such as high-density magnetic recording media. Used for films.
- the demand for dimensional stability in high-density magnetic recording media and the like in recent years has been increasing, and further improvement in characteristics has been demanded. ⁇
- Patent Documents 1 to 4 include 6,6 ′-(alkylenedioxy) di-2-naphthoic acid ester compound jetyl-6,6 ′-(alkylenedioxy) di-2-naphthoate.
- Polyalkylene-1,6,1 (alkylenedioxy) ge-2-naphthoate derived from straw has been proposed.
- polyethylene-6,6 '-(ethylenedioxy) G2-naphthoate which is crystalline and has a melting point of 2 94, is presented.
- the polyalkylene-1,6 '-(alkylenedioxy) -di-2-naphthoate presented in these patent documents has a very high melting point and very high crystallinity.
- To fluidity in the molten state There were problems such as poor extrusion and non-uniform extrusion, and after extrusion, crystallization progressed and fracture occurred when stretched at a high magnification.
- a film using polyethylene 1,6'1 (ethylenedioxy) G 2-naphthoate has a maximum temperature expansion coefficient of 10 to 35 (ppm Z ° C) and a maximum humidity expansion coefficient of 0. ⁇ 8 (ppmZ% RH), the difference between maximum and minimum temperature expansion coefficient is 0 ⁇ 6.0 (ppm /), and the difference between maximum and minimum humidity expansion coefficient is 0 ⁇ 4.0 (p pm /% RH) teaches that a magnetic recording flexible disk with small tracking deviation can be obtained.
- the demand for higher recording density in magnetic recording media in recent years is severe, and the dimensional stability required for the base film is not limited to polyethylene terephthalate, but also polyethylene 1,6-naphthalate and patents. Even with films such as those presented in Reference 3, the situation has become impossible to achieve.
- Patent Document 1 Japanese Patent Application Laid-Open No. 60-135428
- Patent Document 2 JP-A-60-221420
- Patent Document 3 Japanese Patent Laid-Open No. 61-145724
- Patent Document 4 Japanese Patent Laid-Open No. 6-145323 Disclosure of Invention
- An object of the present invention is to provide a polyester resin excellent in dimensional stability in environmental changes and processing steps, and a biaxially oriented polyester film using the same, while having excellent moldability.
- both the humidity expansion coefficient and the temperature expansion coefficient are very closely related to the Young's modulus, and generally the lower the Young's modulus, the lower.
- the Young's modulus is not increased as much as it can be, and there is a limit in terms of film forming properties and securing the Young's modulus in the orthogonal direction. Therefore, there has been a demand for a film having a low expansion coefficient with respect to temperature and humidity even if the Young's modulus is similar. Does the film of polyalkylene-6,6 '-(alkylenedioxy) di-2-naphtho show a low coefficient of humidity expansion even if the hang rate is low? Therefore, it was considered as a suitable film meeting this characteristic.
- the film composed of polyalkylene-1,6 '-(alkylenedioxy) ge-2-naphtho is one that has a very high yang ratio but is orthogonal to it.
- the Young's modulus in the direction of the direction becomes extremely low.
- Another problem is that the coefficient of thermal expansion is very high although the coefficient of humidity expansion is very small.
- This polyester resin containing a 6,6 ′-(alkylenedioxy) di-2-naphthoic acid component as a copolymer component is a useful resin having excellent characteristics.
- the coating film for forming the magnetic layer is applied and dried. It was found that there were problems such as the inability to uniformly apply magnetic layer force. This problem does not occur with films of polyethylene 1,6-naphthalene dicarboxylate.
- the present inventors have found that the repeating unit from the 6, 6 '-(alkylenedioxy) di-2-naphthoic acid component is adjacent to other repeating units.
- the inventors have found that by suppressing the elongation, the present invention has been achieved.
- the repeating unit (A) mainly represented by the following formula
- the repeating unit (B) represented by the following formula
- R 1 is a phenylene group or a naphthalene diyl group
- R 2 is an alkylene group having 2 to 4 carbon atoms or a hexane dimethylene group
- R 3 is represented by the following formula: (C)
- R 4 is an alkylene group having 2 to 10 carbon atoms.
- the content of repeating unit (B) is 5 mol% or more and less than 50 mol%, and the proportion of repeating units (A) and (B) adjacent to each other (C A _ B ) is A polyester resin characterized by satisfying the formula (1) is provided.
- (C A ) is the mole fraction of repeating units (A) in the polyester resin based on the total number of moles of repeating units (A) and (B),
- (C B ) is the mole fraction of repeating units (B) in the polyester resin based on the total number of moles of repeating units (A) and (B),
- (C A _ B ) is the recurring unit (A) and (A), (B) and (B), and (A) and (B). ) And (B) mean the ratio of adjacent. )
- the proportion of the repeating unit (B) is 5 mol% or more and less than 50 mol%, and the proportion of the repeating units (A) and (B) adjacent to each other is the repeating units (A) and ( It is a polyester resin that is less than 0.9 with respect to twice the product of the content ratio of B).
- R 2 is an ethylene group
- the repeating unit (A) is selected from the group consisting of ethylene 1,6-naphthalene dicarboxylate units and ethylene terephthalate units.
- a polyester resin comprising at least one selected from the group consisting of at least one selected from R 4 and an ethylene group.
- the present invention provides a polyester according to the present invention.
- a biaxially oriented polyester film made of a steal resin is also provided.
- the Young's modulus is at least 6. OGPa in at least one direction in the film surface direction, and at least one direction in the film surface direction is represented by the following formula: 2)
- cuh is the humidity expansion coefficient (ppmZ% RH)
- Y is the Young's modulus (GP a)
- the humidity expansion coefficient in at least one direction of the film is 1 to 7 Ppm / RH range
- thermal expansion coefficient in at least one direction of the film is 10 p pmZ ° C or less, used for the base film of magnetic recording media, linear recording system for magnetic recording media
- a biaxially oriented polyester film comprising at least one of the following high-density magnetic recording tapes is also provided.
- the method for producing a polyester resin of the present invention there is also provided a method for producing a polyester resin in which the mol% of the repeating unit (B) in the polyester resin A and the polyester resin B satisfies the following formula (3).
- the polyester resin is mainly composed of repeating units (A) and repeating units.
- Unit (B) the polyester resin is mainly composed of repeating units (A) and repeating units.
- Cyclohexanedicarboxylic methylene moiety of R 1 is an aromatic Jikarupon acid component is a phenylene group or a naphthalene Jiiru group, part of R 2 is alkylene Motoma other 2-4 carbon atoms cyclohexane It is obtained by reacting at least one darikol component selected from the group consisting of groups.
- Examples of the aromatic dicarboxylic acid component include a terephthalic acid component, an isophthalic acid component, a 2,6-naphthalenedicarboxylic acid component, and a 2,7-naphthalenedicarboxylic acid component. From the viewpoint of mechanical properties, a terephthalic acid component and a 2,6-naphthalenedicarboxylic acid component are preferred. In particular, 2,6-naphthalenedicarboxylic acid component is preferred.
- Examples of the Daricol component containing R 2 include ethylene glycol component, trimethylene glycol component, tetramethylene glycol component, and cyclohexane dimethanol component. From the viewpoint of mechanical properties, ethylene glycol and cyclohexane dimethanol are preferred.
- ethylene glycol particularly preferred is ethylene glycol.
- ethylene terephthalate, trimethylene terephthalate, butylene terephthalate, alkylene terephthalate, ethylene-2,6-naphthalate, trimethylene-1,6-naphthalate, butylene-1,2, 6_Naphtherate, alkylene 1,2,6-naphthalate force S is preferable.
- ethylene terephthalate and ethylene-2,6-naphthalate are preferable from the viewpoint of mechanical properties.
- Ethylene-1,6-naphthalate is particularly preferred.
- 90 mol% or more of the glycol component is preferably an ethylene glycol component, particularly preferably in the range of 95 to 100 mol%.
- R 4 in the formula (C) includes an alkylene group having 2 to 10 carbon atoms.
- the aromatic dicarboxylic acid component constituting the repeating unit (B) includes 6, 6, 1 (ethylenedioxy) di-2-naphthalic acid component, 6, 6'- (trimethylenedioxy) di-2- -Naphthoic acid component and 6,6 '-(Phylenedioxy) di-1-2-naphthoic acid component.
- R 4 has an even number of carbon atoms.
- 6,6 '-(ethylenedioxy) di-2-naphthoic acid component is preferred.
- the glycol component in the repeating unit (B) is preferably the same as the repeating unit (A).
- the total number of repeating units (A) and repeating units (B) with respect to all repeating units in the polyester resin of the present invention is preferably 90 to 100 mol%, more preferably 95 to 0 mol%.
- the content of the repeating unit (B) in the polyester resin should be 5 mol% or more and less than 50 mol% based on the total number of moles of the repeating unit (A) and the repeating unit (B). .
- the proportion of the repeating unit (B) is less than the lower limit, the effect of reducing the coefficient of humidity expansion in the present invention due to copolymerization is hardly exhibited.
- the ratio of the repeating unit (B) exceeds the upper limit, the moldability and the like tend to be impaired.
- the effect of reducing the coefficient of humidity expansion by the repeating unit (B) is expressed very efficiently even in a small amount, and is already less than the upper limit of the above-mentioned copolymerization amount, particularly in a portion below 50 mol%.
- a humidity expansion coefficient equivalent to or lower than that of the film described in the example of Patent Document 3 has been achieved, and it can be said that the effect from the viewpoint of the humidity expansion coefficient is saturated even when the upper limit is added.
- the upper limit of the proportion of the repeating unit (B) is preferably 45 mol% or less, more preferably 40 mol% or less, even more preferably 35 mol% or less, especially 30 mol% or less, while the lower limit is 5 mol%. Further, it is 7 mol% or more, further 10 mol% or more, and especially 15 mol% or more.
- the feature of the present invention is that the ratio (C A B ) force of the repeating unit (A) and the repeating unit (B) adjoining to each other satisfies the above formula (1).
- the denominator in the above formula (1) is the probability that the repeating units (A) and (B) are adjacent to each other, and therefore the aromatic dicarboxylic acid component constituting the repeating units (A) and (B).
- such a polyester resin of the present invention is obtained by simply esterifying or transesterifying and polycondensing together an aromatic dicarboxylic acid component and a glycol component constituting the repeating units (A) and (B). It does not react.
- it can be produced by preparing polyester resin B having repeating unit (B) as a main repeating unit and polyester resin A having repeating unit (A) as a main repeating unit, and melt-kneading them.
- the polyester resin of the present invention is not limited to those produced by melt kneading as described above, and any production method can be used as long as it satisfies the above formula (1). Also good.
- the lower limit of the ratio represented by the above formula (1) is not particularly limited. Since the transesterification proceeds when at least two or more polyester resins are melt-kneaded, they usually tend to be 0.4 or more. If resin A and polyester resin B are kneaded closely, it tends to be 0.6 or more.
- the aforementioned (C A ) is the mole fraction of the repeating unit (A) based on the total number of moles of the repeating units (A) and (B), and (C B ) is the repeating unit (A) and The mole fraction of repeating unit (B) based on the total number of moles of (B), (C A — B) is the repeating units (A) and (A), (B) and (B) and ( This means the ratio of repeating units (A) and (B) next to each other, based on the total number of cases where A) and (B) are adjacent.
- the ratio of repeating units (A) and (A) may be called (C A _ A )
- the ratio of repeating units (B) and (B) may be called (C B — B).
- polyester resin of the present invention The preferred embodiment of the polyester resin of the present invention will be further described in detail.
- the polyester resin in the present invention may be copolymerized with other copolymerization components known per se within a range that does not impair the effects of the present invention, or a composition obtained by blending a polyetherimide or a liquid crystalline resin. It is good also as a thing.
- the polyester resin of the present invention has an intrinsic viscosity s measured at 35 ° C using a mixed solvent of P-chlorophenol / 1,1,2,2-tetrachloroethane (weight ratio 40/60), preferably 0 4 to 1.5 dlZg, more preferably 0.5 to 1.3 dl / g.
- the melting point measured by DSC of the polyester resin of the present invention is preferably in the range of 200 to 260 ° C, more preferably in the range of 215 to 255 ° C, particularly in the range of 225 to 253 ° C, from the viewpoint of film forming property. .
- the melting point exceeds the above upper limit, when melt extrusion is performed, the fluidity is inferior and the discharge is likely to be non-uniform.
- it is less than the above lower limit, although the film-forming property is excellent, the mechanical properties and the like of the aromatic polyester are easily impaired. That is, if other acid components are usually copolymerized and the melting point is lowered, the mechanical properties and the like are also lowered at the same time.
- the polyester resin of the present invention has a glass transition temperature (hereinafter sometimes referred to as Tg) measured by DSC.
- Tg glass transition temperature
- the force is in the range of 90 to 120, more preferably in the range of 95 to 119 ° C, particularly in the range of 100 to 118 ° C. It is preferable from the viewpoint of heat resistance and dimensional stability.
- Such a melting point and glass transition temperature can be adjusted by controlling the type and amount of copolymerization component, and the by-product dialkylene glycol.
- the biaxially oriented polyester film of the present invention is made by melting the aforementioned polyester resin. It is obtained by forming a film and extruding it into a sheet. As described above, since the fluidity at the time of melting and the subsequent crystallinity are improved, the film is excellent in film forming property, for example, a uniform film having no thickness unevenness.
- polyester resin polyalkylene-1, 6 '-(alkylenedioxy) GE-2-naphthoene and its copolymerization repeat unit (A).
- the mechanical properties of aromatic polyesters having are also provided.
- the film formed by directly forming the polyester resin of the present invention satisfies the formula (1) as with the polyester resin.
- the Young's modulus is 6. OGP in at least one direction in the film surface direction. It is preferable that it is a or more. Moreover, by having such a high Young's modulus, it is possible to sufficiently reduce the coefficient of humidity expansion even when polyalkylene-1,6,-(alkylenedioxy) G-2-naphthoate is used as a copolymerization component. I can do it.
- the upper limit of Young's modulus is not limited, but is usually 11 GPa.
- Preferred Young's modulus is 5.1 to L in the longitudinal direction of the film; moreover 5.2 to: L OGP a, particularly in the range of 5.5 to 9 GPa, and the width direction of the film is 5.0 to; GPa, further 6 to; L 0 GPa, in particular 7 to 10 GPa.
- the biaxially oriented polyester film of the present invention has a film with a coefficient of humidity expansion (ah) and a Young's modulus (at least in one direction, preferably in a direction where the Young's modulus of the film is 6 GPa or more, particularly preferably in the width direction of the film).
- Y and force It is preferable to satisfy the relationship of the following formula (2).
- the obtained biaxially oriented polyester film force does not satisfy the relationship of the above formula (2)
- the hung rate is only equivalent to h, and polyalkylene-6,6 '-(alkylenedioxy) di-2-naphthoate is used.
- the effect of reducing humidity expansion due to copolymerization is not sufficiently exhibited.
- the coefficient “1.2” in the above formula (2) is derived from the relationship between the Young's modulus and ah of the polyethylene 1,6-naphthalate film described in Comparative Examples 1 to 3 of this specification. It is a thing.
- the above-mentioned Young's modulus, ah, and the thickness t described later can be adjusted by the copolymerization described above and the stretching described later.
- the biaxially oriented polyester film of the present invention has a temperature expansion coefficient (at) in at least one direction, preferably in the width direction of the film, of 10 p pm / ° C or less because it exhibits excellent dimensional stability. Is preferred. When the temperature expansion coefficient in at least one direction of the film is 10 ppm or less, excellent dimensional stability against environmental changes can be exhibited. From the results of Patent Document 3, it is expected that when polyalkylene-6,6 '-(alkylenedioxy) diol-2-naphthalate is copolymerized, the temperature expansion coefficient is expected to increase.
- the present invention has surprisingly been able to reduce the coefficient of thermal expansion by copolymerizing within the range of the copolymerization amount and stretching it.
- the lower limit of the coefficient of thermal expansion is not limited, but usually 15 ppm / ° C.
- Preferable coefficient of thermal expansion (at) is -10 ⁇ : L OppmZ, and also-7 ⁇ 7 ppmZ, especially in the range of 5 ⁇ 5 p pn ° C. This is preferable because it can exhibit excellent dimensional stability against dimensional changes due to changes in humidity.
- the biaxially oriented polyester film of the present invention has a humidity expansion coefficient (ah) in the direction satisfying the relationship of the temperature expansion coefficient in at least one direction, preferably in the film width direction, of 1 to 7 ppmZ% RH, preferably 3 to 6
- a range of p pm /% RH is preferable from the viewpoint of dimensional stability particularly when a magnetic recording tape is used.
- the direction is the width direction of a biaxially oriented polyester film because track deviation can be extremely suppressed.
- the width direction satisfies at least one direction, preferably as described above. Therefore, it is preferable that the same temperature expansion coefficient, humidity expansion coefficient, and Young's modulus are satisfied.
- 6, 6,-(alkylenedioxy) di-2-naphthoic acid is reacted with 2, 6-naphthalenedisulfonic acid, terephthalic acid or its ester-forming derivative, and ethylene glycol, for example.
- a precursor is produced. And it can manufacture by polymerizing the polyester precursor obtained in this way in presence of a polymerization catalyst, and may perform a solid phase polymerization etc. as needed. What is important at this time is to produce at least two or more polyester resins having different proportions of repeating units (A) and (B) in the resulting polyester resin, as described above. ) And a polyester resin B mainly having a repeating unit (B).
- the molar percentage of the repeating unit (B) in the polyester resin A (ACJ and the repeating unit in the polyester resin B)
- the return mole percentage of units (B) (BC B), 10 mol% or more, more 30 molar% or more, is preferably different in particular 50 mol% or more.
- the ratio of the repeating unit (B) is 50 to 100 mol%, and it can be easily adjusted to the range of the above-mentioned formula (1) while facilitating melt-kneading into the polyester resin A. Therefore, 55 mol% or more and 90 mol% or less, particularly 58 mol% or more and less than 80 mol% are preferable.
- the ratio of the repeating unit (A) is 60 mol% or more, further 70 mol% or more, particularly 80 mol% or more is adjusted to the range of the above formula (1). It is preferable because it is easy.
- the upper limit of the proportion of the repeating unit (A) in the polyester resin A is not particularly limited, and may be 100 mol% and may be fc.
- polyester resins may be melt-kneaded under conditions that do not allow the transesterification reaction to proceed completely. Specifically, the progress of the transesterification reaction can be suppressed as the temperature of the melt-kneading becomes lower and the time for the melt-kneading becomes shorter.
- the intrinsic viscosity of the aromatic polyester obtained in this way measured at 35 using a mixed solvent of P-chlorophenol; t-nol Zl, 1, 2, 2-tetrachlorophthalate (weight ratio 40Z60) is 0 From the viewpoint of the effect of the present invention, it is preferably in the range of 4 to 1.5 dlZg, and more preferably in the range of 0.5 to 1.3 dl / g.
- the glycol component is ethylene glycol in the process for producing the polyester precursor described above
- the ethylene glycol component is 1.1 to 6 times the moles of all acid components, and further 2 to 5 It is preferable from the viewpoint of productivity to use twice, particularly 3 to 5 times.
- the reaction temperature for producing the polyester precursor is preferably at or above its boiling point when the glycol component is ethylene glycol, and particularly within the range of 19: to 250 ° C. preferable. When the temperature is lower than 190 ° C, the reaction does not proceed sufficiently. When the temperature is higher than 250 ° C, dialkylene glycol, which is a side reaction product, is likely to be generated.
- the reaction can be carried out under normal pressure. In order to increase productivity, the reaction may be performed under pressure. More specifically, the reaction pressure is an absolute pressure in the range of 1 O k Pa or more and 2 0 0 k Pa or less, and the reaction temperature is usually 15 to 50 ° C. or more and 25 to 50 ° C. or less, preferably 180 to 80 ° C. or more 2 3 It is preferably carried out at 0 ° C. or less at a reaction time of 10 minutes to 10 hours, preferably 30 minutes to 7 hours. By this esterification reaction, a reactant as a polyester precursor is obtained.
- a known esterification or ester exchange reaction catalyst may be used.
- alkali metal compounds, alkaline earth metal compounds, titanium compounds and the like can be mentioned.
- the polycondensation temperature is in the range of not less than the melting point of the obtained polymer and not more than 230 to 2800 ° C, more preferably 5 ° C higher than the melting point to 3Ot higher than the melting point.
- the polycondensation reaction is usually preferably carried out under reduced pressure of 50 Pa or less. If it is higher than 50 Pa, the time required for the polycondensation reaction becomes long and it becomes difficult to obtain a copolymerized aromatic polyester resin having a high degree of polymerization.
- the polycondensation catalyst include metal compounds containing at least one metal element. The polycondensation catalyst can also be used in the esterification reaction.
- metal element examples include titanium, germanium, antimony, aluminum, nickel, zinc, tin, cobalt, rhodium, iridium, zirconium, hafnium, lithium, calcium, and magnesium. More preferred metals are titanium, germanium, antimony, aluminum, tin, etc. Among them, titanium compounds are particularly preferred because they exhibit high activity in both the esterification reaction and the polycondensation reaction.
- the amount of the catalyst is preferably from 0.001 to 0.5 mol%, more preferably from 0.05 to 0.2 mol%, based on the number of moles of the repeating unit of the copolymerized aromatic polyester.
- titanium compound as the polycondensation catalyst examples include tetra-n-methyl pyrtitanate, tetra-isopropyl titanate, tetra-n-butyl titanate, tetra-isobutyl titanate, tetra-tert-butyl titanate, and tetracyclohexyl.
- Titanate, tetraphenyl titanate, tetrabenzylthio It consists of oxalate, lithium oxalate titanate, potassium oxalate titanate, ammonium oxalate titanate, titanium oxide, titanium orthoester or condensed orthoester, titanium orthoester or condensed orthoester and hydroxycarponic acid.
- Reaction product reaction product consisting of ortho ester or condensed ortho ester of titanium, hydroxy carboxylic acid and phosphorus compound, ortho ester or condensed ortho ester of titanium and polyhydric alcohol having at least two hydroxyl groups, 2-hydroxy
- the reaction product include carboxylic acid or base.
- other thermoplastic resins, stabilizers such as UV absorbers, antioxidants, plasticizers, lubricants, flame retardants, mold release agents, as long as the effects of the present invention are not impaired.
- a pigment, a nucleating agent, a filler or glass fiber, carbon fiber, layered silicate, etc. may be blended as necessary to form a polyester resin composition.
- thermoplastic polymers include aliphatic polyester resins, polyamide resins, polycarbonate, ABS resins, polymethyl methacrylate, polyamide elastomers, polyester elastomers, polyether imides, polyimides, etc. It is done. Film manufacturing method>
- the biaxially oriented polyester film of the present invention is preferably one that has been stretched in the film forming direction and the width direction to enhance the molecular orientation in each direction.
- it can be produced by the following method, It is preferable because the Young's modulus is easily improved while maintaining the film forming property.
- the polyester resin of the present invention described above, or a polyester resin having a large number of repeating units (A) and a polyester resin having a large number of repeating units (B) before being melt-kneaded are used as raw materials. It is supplied to an extruder heated to a melting point (Tm: ° C) to (Tm + 50) ° C, and extruded in a sheet form from a die such as a T die. The extruded sheet is rapidly cooled and solidified with a rotating cooling drum or the like to form an unstretched film, and the unstretched film is further biaxially stretched. At this time, care must be taken so that the above-described transesterification reaction does not proceed during melt-kneading.
- the film-forming stability is impaired.
- the 6,6 ′-(alkylenedioxy) di-2-naphthoic acid component is copolymerized, so that the stretchability is increased. Is very high, so there is no such problem, and since the draw ratio can be increased, it is particularly useful for thin films with a thickness of 10 m or less, and even 8 m or less.
- the lower limit of the film thickness is not particularly limited, but is usually about 1 m, preferably 3 m.
- the biaxially oriented polyester film of the present invention can be produced by simultaneous biaxial stretching in which longitudinal stretching and lateral stretching are simultaneously performed, such as the stretching ratio and stretching temperature described above. Should be referred to.
- the biaxially oriented polyester film of the present invention is not limited to a single layer film, and may be a laminated film. In that case, at least one film layer may be the biaxially oriented polyester film of the present invention.
- two or more types of molten polyester are laminated in a die and then extruded into a film.
- each polyester has a melting point (Tm :) or (Tm + 70) ° C. Extrude at a temperature, or laminate two or more types of molten polyester after extrusion from a die and quench It is preferable to solidify to form a laminated unstretched film, and then to perform biaxial stretching and heat treatment in the same manner as in the case of the single-layer film described above.
- the biaxially oriented polyester film of the present invention may be provided with a coating layer known per se in order to improve adhesion and slipperiness.
- a coating layer known per se in order to improve adhesion and slipperiness.
- the biaxially oriented polyester film of the present invention is used as a base film, and a nonmagnetic layer and a magnetic layer are formed in this order on one side, and a backcoat layer is formed on the other side.
- a magnetic recording tape can be obtained.
- the intrinsic viscosity of the obtained polyester was determined by dissolving the polymer in a mixed solvent of P-chlorophenoluno1,1,2,2,2-tetrachloroethane (40 60 weight ratio) and measuring at 35 .
- the glass transition point and the melting point were measured by DSC (TA Instruments Co., Ltd., trade name: DS C 2920) at a sample weight of 20 mg and a heating rate of 1 O ⁇ Zm in.
- the obtained film was cut out with a sample width of 1 Omm and a length of 15 cm, and a universal tensile testing device (manufactured by Toyo Pole-Dwin) under the conditions of 10 Om between chucks, 10 mm / min tensile speed, and 50 Omm / min chart speed. , Product name: Tensilon).
- the Young's modulus is calculated from the tangent of the rising part of the obtained load elongation curve.
- the obtained film was cut into a length of 15 mm and a width of 5 mm so that the film forming direction or the width direction of the film would be the measurement direction, and set in a TMA300 0 manufactured by Vacuum Riko Co., Ltd. under a nitrogen atmosphere (0% RH ) Pre-treat at 60 ° C for 30 minutes, and then lower the temperature to room temperature. Then, raise the temperature from 25 to 70 ° C at 2 ° CZmin, measure the sample length at each temperature, and calculate the thermal expansion coefficient (at) from the following equation.
- the measurement direction was the longitudinal direction of the sample that was cut out, measured five times, and the average value was used.
- L 40 in the above formula is the sample length (mm) at 40 ° C
- L 60 is the sample length (mm) at 60 ° C
- 0 .5 is the temperature expansion coefficient (ppm / ° C) of quartz glass.
- the obtained film was cut into a length of 15 mm and a width of 5 mm so that the film forming direction or width direction of the film would be the measurement direction, and set in TMA 3000 manufactured by Vacuum Riko Co., Ltd. under a nitrogen atmosphere of 30 ° C. Then, measure the length of each sample at 30% RH and 70% RH, and calculate the humidity expansion coefficient by the following formula.
- the measurement direction is the longitudinal direction of the sample that was cut out, measured five times, and the average value was ah.
- the thickness of the nonmagnetic layer and the magnetic layer after drying is simultaneously 1 2.
- Titanium dioxide fine particles 100 parts by weight 'SREC A (Sekisui Chemical Co., Ltd. vinyl chloride Z vinyl acetate copolymer: 10 parts by weight
- Methyl isobutyl ketone 75 parts by weight -Toluene 75 parts by weight • Carbon black 2 parts by weight • Lauric acid Composition of magnetic paint
- Dimethyl 2,6-naphthalenedicarboxylate, 6, 6 '— (Ethylenedioxy) G-dinaphthoic acid and ethylene dallicol are subjected to esterification and transesterification in the presence of titanium tetraoxide.
- a polycondensation reaction was performed, and the intrinsic viscosity was 0.62 d 1 Zg, 30 mol% of the acid component was 2,6-naphthalenedicarboxylic acid component, and 70 mol% of the acid component was 6,6 '-( Alkylenedioxy) Di-2-naphthoic acid component, and aromatic polyester (PB 1) in which the glycol component is ethylene glycol was obtained.
- the aromatic polyester contains silica particles having an average particle size of 0.4 zm so that the amount is 0.3% by weight based on the weight of the obtained resin composition before the polycondensation reaction. It was.
- Dimethyl 2,6_naphthylene dicarboxylate, 6, 6,-(ethylenedioxy) di-2-naphthoic acid and ethylene glycol were subjected to esterification and transesterification in the presence of titanium tetrabutoxide, followed by After the polycondensation reaction, the intrinsic viscosity is 0.62 dl / g, 99.5 mol% of the acid component is 2,6 mononaphthalenedicarboxylic acid component, 0.5 mol% of the acid component is 6,6 ' Aromatic polyester (PA1) having 1 (alkylenedioxy) g-2-naphthoic acid component and daricol component as ethylene dallicol was obtained.
- the aromatic polyester contains silica particles having an average particle diameter of 0.4 m before the polycondensation reaction so as to be 0.3% by weight based on the weight of the obtained resin composition. It was.
- Reference example 3 6-Naphthalenediyl dimethyl sulfonate and 6,6 '-(ethylene dioxy)'-di-2-mononaphthoic acid, except that the ratio was changed to the same value as in Reference Example 1, and the intrinsic viscosity was 0. 62d lZg, 73 mol% of the acid component is 2,6-naphthalene dicarboxylic acid component, 27 mol% of the acid component is 6,6 '-(alkylenedioxy) di-2-naphthoic acid component, glycol An aromatic polyester (PA2) whose component is ethylene glycol was obtained.
- the aromatic polyester contained silica particles having an average particle size of 0.4 m before the polycondensation reaction so as to be 0.3% by weight based on the weight of the obtained resin composition. .
- Example 6 6, 6 '-(Ethylenedioxy) di 2- except that no naphthoic acid was added
- PA5 aromatic polyester
- the same operation as in Example 2 was repeated to obtain an aromatic polyester (PA5) having an intrinsic viscosity of 0.62 dLZg, an acid component of 2,6-naphthalenedisulfonic acid component, and a glycol component of ethylene glycol.
- the aromatic polyester contains silica particles having an average particle diameter of 0.4 m before the polycondensation reaction so as to be 0.3% by weight based on the weight of the resin composition to be obtained. It was.
- Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 were fed into the extruder at a weight ratio of 66:34, and 300 ° C (average residence time: 20 minutes) from the die.
- An unstretched film was extruded in the form of a sheet on a cooling drum at a temperature of 55 ° C. during rotation in the molten state. Then, between two sets of nozzles with different rotation speeds along the film forming direction, the film surface temperature is heated to 135 ° C from the top with IR heat, and the vertical direction (film forming direction) The film was stretched at a draw ratio of 5.0 times to obtain a uniaxially stretched film.
- this uniaxially stretched film was introduced into the stainless steel, and the transverse stretch temperature was 13.5 ° C, the transverse stretch ratio was 8.5 times, heat setting (205 ° C for 10 seconds) and cooling, and the thickness was 4.5. m biaxially stretched film was obtained.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- the aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 were melted from the die at a weight ratio of 52:48 and fed to the extruder at 300 (average residence time: 20 minutes).
- the sheet was extruded in the form of a sheet onto a cooling drum at a temperature of 55 ° C. during rotation to obtain an unstretched film.
- the film surface temperature is heated from the top to 130 at the top of the IR to increase the vertical direction (film forming direction). Stretching was performed at a stretching ratio of 5.7 times to obtain a uniaxially stretched film.
- this uniaxially stretched film was introduced into the stainless steel, and the transverse stretching temperature 1 was 30 ° C, the transverse stretching ratio was 8.3 times, heat setting treatment (194 ° C for 10 seconds) and cooling, and the thickness was 5.0. m biaxially stretched film was obtained.
- Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 are fed into the extruder at a weight ratio of 40:60 and 300 ° C (average residence time: 20 minutes) from the die.
- the film was extruded in the form of a sheet on a cooling drum having a temperature of 55 ° C. during rotation in a molten state to obtain an unstretched film.
- the film surface temperature is heated to 125 ° C with an IR heater from above, in the vertical direction (film forming direction). Stretching was performed at a stretch ratio of 6.2 to obtain a uniaxially stretched film.
- this uniaxially stretched film was introduced into a stainless steel, and the transverse stretching temperature was 1.25 ° C, the transverse stretching ratio was 9.5 times, heat setting treatment (190 ° C for 10 seconds) and cooling, and the thickness was 4.5.
- a biaxially stretched film of / im was obtained.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 are fed into the extruder at a weight ratio of 80:20 and 300 ° C (average residence time: 20 minutes) from the die.
- An unstretched film was formed by extruding in a sheet shape onto a cooling drum at a temperature of 55 ° C. while rotating in a molten state. Then, between two sets of rollers with different rotation speeds along the film forming direction, the film is heated from above with an IR heater so that the film surface temperature is 138, and stretched in the longitudinal direction (film forming direction) A uniaxially stretched film was obtained at a draw ratio of 4.8.
- this uniaxially stretched film was introduced into a stainless steel, subjected to a transverse stretching temperature of 1 38 ° C and a transverse stretching ratio of 8.0 times, heat setting treatment (at 214 ° C for 10 seconds) and cooling to a thickness of 4.5. m biaxially stretched film was obtained.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 are 66:34 by weight and supplied to the extruder at 300 ° C (average residence time: 20 minutes) Then, it was extruded into a sheet form on a cooling drum at a temperature of 55, which was rotating in a molten state from a die, to obtain an unstretched film. Then, between two sets of nozzles with different rotational speeds along the film forming direction, the film surface temperature is heated from above with an IR heater so that the film surface temperature becomes 135 ° C. Stretching was performed at a stretch ratio of 5.8 to obtain a uniaxially stretched film.
- this uniaxially stretched film was introduced into a stainless steel, and the transverse stretching temperature was 135 ° C, the transverse stretching ratio was 8.0 times, heat setting treatment (at 205 ° C for 10 seconds) and cooling, and the thickness was 5.0. m biaxially stretched film was obtained.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 were fed into the extruder at a weight ratio of 61:39, and 295 ° C (average residence time: 20 minutes) from the die. Extruded into a sheet form on a cooling drum at a temperature of 55 while rotating in a molten state to obtain an unstretched film. Then, between two sets of nozzles with different rotation speeds along the film forming direction, the film surface temperature is heated to 133 ° C from the top with IR heat, and the vertical direction (film forming direction) The film was stretched at a draw ratio of 5.0 to obtain a uniaxially stretched film.
- this uniaxially stretched film is guided to a stenter, and at a transverse stretching temperature of 1 35 ° C, a transverse stretching ratio of 8.3 times, heat setting treatment (at 202 for 10 seconds) and cooling are performed. An axially stretched film was obtained.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Example 6 the temperature of the extruder was changed to 300 ° C (average residence time: 20 minutes), the draw ratio in the machine direction (film forming direction) was changed to 5.8 times, and the transverse draw ratio was changed to 8.0 times. The same operation was repeated outside.
- Table 1 shows the properties of the resulting biaxially oriented polyester film and the polyester resin that composes it.
- Example 8 Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 were fed to the extruder at a weight ratio of 72:28 and 300 ° C (average residence time: 20 minutes) from the die. An unstretched film was formed by extruding it onto a cooling drum having a temperature of 55 ° C. while rotating in a molten state. Then, between two pairs of rollers with different rotation speeds along the film forming direction, the film surface temperature is heated to 136 ° C from the top with IR heat, and the film in the vertical direction (film forming direction) Stretching was performed at a stretch ratio of 5.0 times to obtain a uniaxially stretched film.
- PA1 and (PB1) obtained in Reference Examples 1 and 2 were fed to the extruder at a weight ratio of 72:28 and 300 ° C (average residence time: 20 minutes) from the die.
- An unstretched film was formed by extruding it onto a cooling drum having a temperature of 55 ° C. while rotating in a
- this uniaxially stretched film was introduced into a stainless steel, subjected to a transverse stretching temperature of 1 36 ° C, a transverse draw ratio of 7.8 times, heat setting (209 ° C for 10 seconds) and cooling to a thickness of 5.0.
- a biaxially stretched film was obtained.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Example 8 the same operation was performed except that the average residence time in the extruder was changed to 15 minutes, the draw ratio in the machine direction (film forming direction) was changed to 5.2 times, and the transverse draw ratio was changed to 8.0 times. Repeated.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyesters (PA1) and (PB1) obtained in Reference Examples 1 and 2 were fed to the extruder at a weight ratio of 76:24 and melted from the die at 300 ° C (average residence time: 15 minutes).
- the sheet was extruded in the form of a sheet onto a cooling drum at a temperature of 55 ° C. during rotation to obtain an unstretched film.
- the film surface temperature is heated from above to reach 136 ° C in the vertical direction (film-forming direction).
- the film was stretched at a draw ratio of 5.2 to obtain a uniaxially stretched film.
- this uniaxially stretched film is led to a stenter, and at a transverse stretching temperature of 1 38, a transverse stretching ratio of 8.2 times, heat setting (212 for 10 seconds) and cooling are performed, and a thickness of 5.0 z / m is obtained.
- An axially stretched film was obtained.
- Example 8 the same operation was performed except that the average residence time in the extruder was changed to 20 minutes, the draw ratio in the machine direction (film forming direction) was changed to 4.8 times, and the transverse draw ratio was changed to 8.0 times. Repeated.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyester (PA2) obtained in Reference Example 3 is fed to an extruder and cooled at 300 ° C (average residence time: 20 minutes). An unstretched film was extruded onto the sheet. Then, between two pairs of rollers with different rotation speeds along the film forming direction, the film is heated from above with an IR heater so that the film surface temperature becomes 130, and stretched in the machine direction (film forming direction). The stretching ratio was 6.3, and a uniaxially stretched film was obtained.
- this uniaxially stretched film was introduced into stainless steel, and at a transverse stretching temperature of 130 ° C, a transverse stretching ratio of 9.2 times was applied, heat setting (at 82 for 10 seconds) and cooling, and a thickness of 5.0 m A biaxially stretched film was obtained.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyester (PA3) obtained in Reference Example 4 is fed to an extruder and is heated at 300 ° C (average residence time: 20 minutes) from a die in a molten state and rotating on a cooling drum at a temperature of 55 ° C.
- the sheet was extruded into an unstretched film.
- the film surface temperature is heated from the top to 125 ° C from the top to the vertical direction (film forming direction).
- the film was stretched at a stretching ratio of 6.8 to obtain a uniaxially stretched film.
- this uniaxially stretched film is led to a stenter, and at a transverse stretching temperature of 125, the transverse stretching ratio is 10.3 times, heat-fixed (at 175 for 10 seconds) and cooled, and biaxially stretched to a thickness of 5.0 m. the film Got.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyester (PA4) obtained in Reference Example 5 is fed to an extruder and is heated at 300 ° C (average residence time: 20 minutes) from a die in a molten state and rotating on a cooling drum at a temperature of 55 ° C.
- the sheet was extruded into an unstretched film.
- the film surface temperature is heated to 138 ° C from the top in the IR direction from the top to the vertical direction (film forming direction)
- the film was stretched at a stretch ratio of 4.2 to obtain a uniaxially stretched film.
- this uniaxially stretched film was introduced into the stainless steel, and the transverse stretch temperature was 138 ° C, the transverse stretch ratio was 7.8 times, heat setting (2 14 ° C for 10 seconds) and cooling to a thickness of 4.5 m biaxially stretched film was obtained.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- the aromatic polyester (PA5) itself obtained in Reference Example 6 was used as the polyester resin.
- the PA5 is supplied to an extruder and is fed at 300 ° C (average residence time: 20 minutes) onto a cooling drum at a temperature of 60 ° C that is rotating in a molten state from the die.
- An unstretched film was extruded.
- the film surface temperature is heated to 140 at the IR heat from above to stretch in the longitudinal direction (film forming direction).
- this uniaxially stretched film was introduced into stainless steel, and at a transverse stretching temperature of 140 ° C, the transverse stretching ratio was 4.3 times, heat-fixed (at 200 ° C for 10 seconds) and cooled to a thickness of 4.5. m biaxially stretched film was obtained.
- Comparative Example 4-2 in Comparative Example 4-11, the stretching temperature in the film forming direction was 140 ° C, the stretching ratio in the film forming direction was 4.0 times, and the stretching temperature in the width direction was 140.
- a biaxially stretched film was obtained by repeating the same operation except that the stretching ratio in the width direction was changed to 4.0 times and the heat setting temperature was changed to 200 ° C.
- Comparative Example 4-3 in Comparative Example 4-1, the stretching temperature in the film forming direction was 140 ° C, the stretching ratio in the film forming direction was 4.5 times, and the stretching temperature in the width direction was 14 times.
- a biaxially stretched film was obtained by repeating the same operation except that the stretching ratio in the width direction was changed to 0, and the heat setting temperature was changed to 200 ° C.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film.
- Table 1 shows the characteristics of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- Aromatic polyester (PB 1) obtained in Reference Example 1 is fed to the extruder and cooled at 300 ° C (average residence time: 20 minutes). An unstretched film was extruded onto the sheet. Then, between two sets of rollers with different rotation speeds along the film forming direction, the film surface temperature is heated from above with an IR heater so that the film surface temperature becomes 120 ° C, and stretching in the machine direction (film forming direction) The stretching ratio was 4.5, and a uniaxially stretched film was obtained.
- this uniaxially stretched film was introduced into a stainless steel, subjected to a transverse stretching temperature of 120 ° C, a transverse stretching ratio of 9.0 times, heat setting (2 at 10 ° C for 10 seconds), and cooled to a thickness of 5.0. m biaxially stretched film was obtained.
- Table 1 shows the properties of the obtained biaxially oriented polyester film and the polyester resin constituting it.
- NA is 2, 6-naphthalenedicarboxylic acid component
- E NA is 6, 6'-one (ethylenedioxy) di-2-naphthoic acid component
- EG is ethylene dallicol component
- DEG is jetylene glycol component
- T g Is the glass transition temperature
- MD is the film forming direction
- TD is the film width direction
- TMA is the elongation ratio determined by the TMA measurement described above.
- the film-forming properties can be enhanced to a high degree, and as a result, Surprisingly, environmental changes such as excellent temperature and humidity that could not be predicted from the prior art, polyester resin that can be simultaneously provided in molded products that can obtain excellent dimensional stability in further processing steps, and biaxials composed thereof A oriented polyester film is provided.
- the biaxially oriented polyester film of the present invention seems not to be able to be achieved by conventional polyethylene terephthalate, polyethylene 1, 2, 1, 1 naphtholate or polyalkylene 1, 6, 6 '(alkylene oxy) 2-naphthoate. It has excellent dimensional stability and can be suitably used as a base film for high-density magnetic recording media, particularly for applications that require dimensional stability.
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- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
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- Magnetic Record Carriers (AREA)
Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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US12/863,303 US8168727B2 (en) | 2008-01-18 | 2009-01-15 | Polyester resin, production process therefor, and biaxially oriented polyester film comprising the polyester resin |
JP2009550084A JP5492569B2 (ja) | 2008-01-18 | 2009-01-15 | ポリエステル樹脂、その製造方法およびそれを用いた二軸配向ポリエステルフィルム |
KR1020107015121A KR101523803B1 (ko) | 2008-01-18 | 2009-01-15 | 폴리에스테르 수지, 그 제조 방법 및 그것을 사용한 2 축 배향 폴리에스테르 필름 |
EP09702326.1A EP2233509B1 (en) | 2008-01-18 | 2009-01-15 | Polyester resin, process for production of the same, and biaxially oriented polyester film comprising the same |
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JP2008-009227 | 2008-01-18 | ||
JP2008009227 | 2008-01-18 |
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EP (1) | EP2233509B1 (ja) |
JP (1) | JP5492569B2 (ja) |
KR (1) | KR101523803B1 (ja) |
WO (1) | WO2009091072A1 (ja) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2012072219A (ja) * | 2010-09-28 | 2012-04-12 | Toray Ind Inc | 二軸配向ポリエステルフィルム |
EP2272669A4 (en) * | 2008-04-21 | 2012-10-31 | Teijin Ltd | BIAXIALLY ORIENTED MULTILAYER FOIL |
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- 2009-01-15 EP EP09702326.1A patent/EP2233509B1/en not_active Not-in-force
- 2009-01-15 WO PCT/JP2009/050903 patent/WO2009091072A1/ja active Application Filing
- 2009-01-15 KR KR1020107015121A patent/KR101523803B1/ko active IP Right Grant
- 2009-01-15 JP JP2009550084A patent/JP5492569B2/ja not_active Expired - Fee Related
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JPWO2009091072A1 (ja) | 2011-05-26 |
US8168727B2 (en) | 2012-05-01 |
EP2233509A4 (en) | 2013-01-16 |
JP5492569B2 (ja) | 2014-05-14 |
EP2233509A1 (en) | 2010-09-29 |
KR101523803B1 (ko) | 2015-05-28 |
EP2233509B1 (en) | 2014-01-01 |
KR20100113507A (ko) | 2010-10-21 |
US20110060108A1 (en) | 2011-03-10 |
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