WO2015159929A1 - 位相差フィルム、円偏光板及び画像表示装置 - Google Patents
位相差フィルム、円偏光板及び画像表示装置 Download PDFInfo
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- WO2015159929A1 WO2015159929A1 PCT/JP2015/061643 JP2015061643W WO2015159929A1 WO 2015159929 A1 WO2015159929 A1 WO 2015159929A1 JP 2015061643 W JP2015061643 W JP 2015061643W WO 2015159929 A1 WO2015159929 A1 WO 2015159929A1
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- 125000005369 trialkoxysilyl group Chemical group 0.000 description 1
- STCOOQWBFONSKY-UHFFFAOYSA-N tributyl phosphate Chemical compound CCCCOP(=O)(OCCCC)OCCCC STCOOQWBFONSKY-UHFFFAOYSA-N 0.000 description 1
- DQWPFSLDHJDLRL-UHFFFAOYSA-N triethyl phosphate Chemical compound CCOP(=O)(OCC)OCC DQWPFSLDHJDLRL-UHFFFAOYSA-N 0.000 description 1
- ZIBGPFATKBEMQZ-UHFFFAOYSA-N triethylene glycol Chemical compound OCCOCCOCCO ZIBGPFATKBEMQZ-UHFFFAOYSA-N 0.000 description 1
- RXJKFRMDXUJTEX-UHFFFAOYSA-N triethylphosphine Chemical compound CCP(CC)CC RXJKFRMDXUJTEX-UHFFFAOYSA-N 0.000 description 1
- 125000004044 trifluoroacetyl group Chemical group FC(C(=O)*)(F)F 0.000 description 1
- 125000000876 trifluoromethoxy group Chemical group FC(F)(F)O* 0.000 description 1
- IGNTWNVBGLNYDV-UHFFFAOYSA-N triisopropylphosphine Chemical compound CC(C)P(C(C)C)C(C)C IGNTWNVBGLNYDV-UHFFFAOYSA-N 0.000 description 1
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 1
- HADKRTWCOYPCPH-UHFFFAOYSA-M trimethylphenylammonium hydroxide Chemical compound [OH-].C[N+](C)(C)C1=CC=CC=C1 HADKRTWCOYPCPH-UHFFFAOYSA-M 0.000 description 1
- 125000000026 trimethylsilyl group Chemical group [H]C([H])([H])[Si]([*])(C([H])([H])[H])C([H])([H])[H] 0.000 description 1
- CNUJLMSKURPSHE-UHFFFAOYSA-N trioctadecyl phosphite Chemical compound CCCCCCCCCCCCCCCCCCOP(OCCCCCCCCCCCCCCCCCC)OCCCCCCCCCCCCCCCCCC CNUJLMSKURPSHE-UHFFFAOYSA-N 0.000 description 1
- QOQNJVLFFRMJTQ-UHFFFAOYSA-N trioctyl phosphite Chemical compound CCCCCCCCOP(OCCCCCCCC)OCCCCCCCC QOQNJVLFFRMJTQ-UHFFFAOYSA-N 0.000 description 1
- XZZNDPSIHUTMOC-UHFFFAOYSA-N triphenyl phosphate Chemical compound C=1C=CC=CC=1OP(OC=1C=CC=CC=1)(=O)OC1=CC=CC=C1 XZZNDPSIHUTMOC-UHFFFAOYSA-N 0.000 description 1
- WUUHFRRPHJEEKV-UHFFFAOYSA-N tripotassium borate Chemical compound [K+].[K+].[K+].[O-]B([O-])[O-] WUUHFRRPHJEEKV-UHFFFAOYSA-N 0.000 description 1
- KCTAHLRCZMOTKM-UHFFFAOYSA-N tripropylphosphane Chemical compound CCCP(CCC)CCC KCTAHLRCZMOTKM-UHFFFAOYSA-N 0.000 description 1
- WGKLOLBTFWFKOD-UHFFFAOYSA-N tris(2-nonylphenyl) phosphite Chemical compound CCCCCCCCCC1=CC=CC=C1OP(OC=1C(=CC=CC=1)CCCCCCCCC)OC1=CC=CC=C1CCCCCCCCC WGKLOLBTFWFKOD-UHFFFAOYSA-N 0.000 description 1
- QQBLOZGVRHAYGT-UHFFFAOYSA-N tris-decyl phosphite Chemical compound CCCCCCCCCCOP(OCCCCCCCCCC)OCCCCCCCCCC QQBLOZGVRHAYGT-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
- 239000011592 zinc chloride Substances 0.000 description 1
- 235000005074 zinc chloride Nutrition 0.000 description 1
- 150000003752 zinc compounds Chemical class 0.000 description 1
- NWONKYPBYAMBJT-UHFFFAOYSA-L zinc sulfate Chemical compound [Zn+2].[O-]S([O-])(=O)=O NWONKYPBYAMBJT-UHFFFAOYSA-L 0.000 description 1
- 229960001763 zinc sulfate Drugs 0.000 description 1
- 229910000368 zinc sulfate Inorganic materials 0.000 description 1
- 150000003755 zirconium compounds Chemical class 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/08—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of polarising materials
-
- 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
- C08G63/64—Polyesters containing both carboxylic ester groups and carbonate groups
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/85—Arrangements for extracting light from the devices
- H10K50/858—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K50/00—Organic light-emitting devices
- H10K50/80—Constructional details
- H10K50/86—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/875—Arrangements for extracting light from the devices
- H10K59/879—Arrangements for extracting light from the devices comprising refractive means, e.g. lenses
-
- H—ELECTRICITY
- H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
- H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
- H10K59/00—Integrated devices, or assemblies of multiple devices, comprising at least one organic light-emitting element covered by group H10K50/00
- H10K59/80—Constructional details
- H10K59/8791—Arrangements for improving contrast, e.g. preventing reflection of ambient light
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3033—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state in the form of a thin sheet or foil, e.g. Polaroid
Definitions
- the present invention relates to a thin retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability, and a circularly polarizing plate and an image display device obtained using the same.
- optical transparent resins used in optical systems such as optical lenses, optical films, and optical recording media.
- FPDs thin flat panel displays
- organic EL (Electro Luminescence) displays are particularly widespread, and display such as improvement of contrast and coloring, widening of viewing angle, prevention of external light reflection, etc.
- Various optical films have been developed and used for the purpose of improving quality.
- the retardation film used for the quarter-wave plate can obtain ideal retardation characteristics at each wavelength in the visible region, and has a wide-band wavelength dispersion characteristic. Is required.
- a broadband retardation film can be obtained by laminating two types of retardation films having different birefringence wavelength dispersion so that their slow axes are orthogonal to each other.
- Patent Document 1 a method obtained by laminating a half-wave plate and a quarter-wave plate so that each slow axis has a specific arrangement
- Patent Document 2 a broadband retardation film made of cellulose acetate having a specific degree of acetylation
- Patent Document 4 A retardation film exhibiting reverse wavelength dispersion is disclosed (Patent Document 4).
- Patent Document 7 discloses a diamine compound having a fluorene ring in the side chain, and further describes a stretched film of a polyimide resin using the diamine compound.
- Patent Document 8 discloses a polycarbonate resin using a fluorene compound that does not contain an aromatic ring on the main chain.
- Patent Document 9 discloses a dihydroxy compound or a diester compound having two fluorene rings in the same molecule, and further describes a stretched film of a polyester resin using the same.
- the retardation film is required to have further improved optical properties, quality, reliability and the like, and to make the film thinner. Further, there are demands for cost reduction of materials and improvement of productivity in each process such as film formation, stretching, and lamination. Accordingly, the retardation film is required to have various characteristics.
- the material used for the retardation film has the necessary wavelength dispersion and also has various physical properties such as low photoelastic coefficient, high heat resistance, melt processability, and mechanical strength. There is a demand for a material having a large birefringence, excellent flexibility and stretchability, and a high degree of molecular orientation obtained by stretching.
- Patent Document 1 and Patent Document 2 results in a thick polarizing plate. Further, each retardation film must be laminated so that the slow axis is in a specific arrangement, and there is a problem that productivity and yield of the polarizing plate deteriorate.
- the retardation films of Patent Document 3 and Patent Document 4 have reverse wavelength dispersion, and a broadband retardation characteristic can be obtained with a single film, but the cellulose acetate of Patent Document 3 has insufficient heat resistance. In addition, there is a problem that image spots are generated due to dimensional deformation due to moisture absorption.
- the retardation film made of polycarbonate resin having a fluorene ring described in Patent Documents 4 to 6 is known to be useful as a retardation film exhibiting reverse wavelength dispersion and a circularly polarizing plate for preventing external light reflection of an image display device. It has been.
- the resin using 9,9-bis (4-hydroxy-3-methylphenyl) fluorene is difficult to be stretched to obtain a high degree of orientation because the film is brittle.
- Resin using 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene is relatively excellent in stretchability, but has a slightly higher photoelastic coefficient and reliability at high temperatures. I found it inferior.
- the polycarbonate resin using a diol containing a fluorene ring described in Patent Document 8 has insufficient properties such as reverse wavelength dispersion, photoelastic coefficient, and heat resistance.
- the polyester described in Patent Document 9 describes negative refractive index anisotropy, that is, the refractive index in the stretching direction is smaller than the refractive index in the direction perpendicular to the stretching.
- the retardation film needs to have positive refractive index anisotropy, and the above-described stretched polyester film does not satisfy this requirement. Further, Patent Document 9 does not describe the wavelength dependence of the phase difference.
- the object of the present invention is to solve the above-mentioned problems and to provide a thin retardation film excellent in various properties such as optical properties, heat resistance, mechanical properties, and reliability, and a circularly polarizing plate and an image obtained using the same. It is to provide a display device.
- the inventors of the present invention have achieved excellent optical characteristics in a film containing a thermoplastic resin in which a retardation film obtained by controlling the optical characteristics within the following specific range is used.
- the present invention has been found out to show mechanical properties. That is, the gist of the present invention is as follows.
- a retardation film containing a thermoplastic resin and comprising a single layer The value of chromatic dispersion (R450 / R550), which is the ratio of the retardation (R450) at a wavelength of 450 nm and the retardation (R550) at a wavelength of 550 nm, is 0.75 or more and 0.92 or less,
- thermoplastic resin is composed of at least one linking group of a carbonate bond and an ester bond, a structural unit represented by the following general formula (1), and a structural unit represented by the following general formula (2).
- R 1 to R 3 are each independently a C 1-4 alkylene group which may have a direct bond or a substituent
- R 4 R 9 is independently a hydrogen atom, an optionally substituted alkyl group having 1 to 10 carbon atoms, an optionally substituted aryl group having 4 to 10 carbon atoms, or a substituent.
- An optionally substituted acyl group having 1 to 10 carbon atoms, an optionally substituted alkoxy group having 1 to 10 carbon atoms, and an optionally substituted aryl having 1 to 10 carbon atoms An oxy group, an optionally substituted acyloxy group having 1 to 10 carbon atoms, an amino group optionally having substituents, and a vinyl group having 1 to 10 carbon atoms optionally having a substituent , An ethynyl group having 1 to 10 carbon atoms which may have a substituent, a sulfur atom having a substituent, a substituent A silicon atom, a halogen atom having an nitro group, or a cyano group.
- at least two groups adjacent to each other among R 4 to R 9 may be bonded to each other to form a ring.
- thermoplastic resin contains the structural unit represented by the general formula (1) or the general formula (2) in a total amount of 1% by mass to 40% by mass.
- the retardation film described.
- Inclusion of a structural unit containing an aromatic group in the thermoplastic resin (excluding the structural unit represented by the general formula (1) and the structural unit represented by the general formula (2)).
- the retardation film according to [5] or [6] wherein the amount is 5% by mass or less.
- a circularly polarizing plate comprising the retardation film according to any one of [1] to [8] and a polarizer laminated on the retardation film.
- An image display device comprising the circularly polarizing plate according to [9].
- An organic EL panel comprising the circularly polarizing plate according to [9].
- the retardation film of the present invention has the specific optical characteristics. Therefore, the retardation film of the present invention can be suitably used for an image display device or the like.
- FIG. 1 is a graph plotting birefringence ( ⁇ n) and chromatic dispersion (R450 / R550) obtained in Examples and Comparative Examples.
- the “structural unit” means a partial structure sandwiched between adjacent linking groups in the polymer, a polymerization reactive group present at the terminal portion of the polymer, and the polymerization reactive group. A partial structure sandwiched between matching linking groups.
- “wt%” and “mass%”, “part by weight” and “part by mass”, and “wt ppm” and “mass ppm” have the same meaning.
- the retardation film of the present invention is a retardation film comprising a thermoplastic resin and comprising a single layer, and is characterized by satisfying all of the following (A) to (C).
- A The value of chromatic dispersion (R450 / R550), which is the ratio between the phase difference (R450) at a wavelength of 450 nm and the phase difference (R550) at a wavelength of 550 nm, is 0.75 or more and 0.92 or less.
- B Birefringence ( ⁇ n) at a wavelength of 550 nm and the chromatic dispersion (R450 / R550) satisfy the relationship of the following formula (I).
- C The photoelastic coefficient is 25 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less. ⁇ n ⁇ 0.0140 ⁇ (R450 / R550) ⁇ 0.0082 (I)
- the retardation film of the present invention is a stretched film obtained by stretching an unstretched film made of a thermoplastic resin in at least one direction by a stretching method described later, and is a film having the above characteristics in a single layer.
- the retardation film has a slow axis that coincides with the stretching direction (positive refractive index anisotropy), and a wavelength that is a ratio of a retardation (R450) at a wavelength of 450 nm to a retardation (R550) at a wavelength of 550 nm.
- the value of dispersion (R450 / R550) is 0.75 or more and 0.92 or less.
- the value of chromatic dispersion (R450 / R550) is preferably 0.78 or more and 0.91 or less, and particularly preferably 0.80 or more and 0.90 or less.
- the retardation film When the value of chromatic dispersion (R450 / R550) is within the above-mentioned specific range, the retardation film exhibits reverse wavelength dispersion in which the phase difference decreases as the wavelength becomes shorter, and each wavelength in the visible region. It is possible to obtain an ideal phase difference characteristic.
- a circularly polarizing plate that forms circularly polarized light at each wavelength in the visible region can be produced. As a result, a neutral circularly polarizing plate and a display device with little coloring can be realized.
- in-plane birefringence ( ⁇ n) at 550 nm and wavelength dispersion (R450 / R550) satisfy the relationship of the following formula (I). More preferably, the in-plane birefringence ( ⁇ n) and the wavelength dispersion (R450 / R550) satisfy the relationship of the following formula (II). ⁇ n ⁇ 0.0140 ⁇ (R450 / R550) ⁇ 0.0082 (I) ⁇ n ⁇ 0.0140 ⁇ (R450 / R550) ⁇ 0.0080 (II)
- phase difference is proportional to the thickness (d) and birefringence ( ⁇ n) of the film
- ⁇ n birefringence
- the retardation film of the present invention for example, as described later, by blending a resin with a structural unit derived from a fluorene-based monomer having a fluorene ring in the side chain, while minimizing the decrease in intrinsic birefringence, Reverse wavelength dispersion can be imparted. Furthermore, by using the fluorene monomer, the toughness of the resin is improved, so that it is possible to realize the high orientation as described above.
- the retardation film has a photoelastic coefficient of 25 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- the photoelastic coefficient is preferably 20 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, more preferably 15 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less, and preferably 12 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less. More preferably, it is particularly preferably 10 ⁇ 10 ⁇ 12 Pa ⁇ 1 or less.
- the photoelastic coefficient is excessively large, there is a possibility that the image quality is deteriorated such that the periphery of the screen is blurred in white when the retardation film is bonded to the polarizing plate. This problem is particularly noticeable when used in large display devices.
- the thickness of the retardation film is preferably 60 ⁇ m or less, although it depends on the design value of the retardation. Further, the thickness of the retardation film is more preferably 50 ⁇ m or less, further preferably 45 ⁇ m or less, and particularly preferably 40 ⁇ m or less. On the other hand, if the thickness is excessively thin, it becomes difficult to handle the film, and wrinkles occur during the production or breakage occurs. Therefore, the lower limit of the thickness of the retardation film is preferably 10 ⁇ m or more, more preferably Is 20 ⁇ m or more.
- the retardation film preferably has a refractive index of 1.49 to 1.56 at a sodium d line (589 nm).
- the refractive index is more preferably 1.50 to 1.55, further preferably 1.51 to 1.54, and particularly preferably 1.51 to 1.53.
- the smaller the refractive index the more the surface reflection of the retardation film can be suppressed, and the total light transmittance can be improved.
- the resin used in the present invention needs to contain an aromatic component in order to impart reverse wavelength dispersion. Therefore, although the refractive index is higher than that of the total aliphatic polymer, the refractive index can be kept within the above range by minimizing the content of the aromatic component.
- the retardation film preferably has an internal haze of 3% or less, more preferably 2% or less, and particularly preferably 1% or less.
- the lower limit value of the internal haze is not particularly defined, but is usually 0.1% or more.
- the transparent film with adhesive that had been previously measured for haze was attached to both sides of the unstretched film, and the sample with the effect of external haze removed was used. The value obtained by subtracting the haze value from the measured value of the sample is defined as the internal haze value.
- the b * value of the retardation film is preferably 3 or less. If the b * value of the film is too large, problems such as coloring occur.
- the b * value is more preferably 2 or less, particularly preferably 1 or less.
- the b * value is measured using a spectrocolorimeter CM-2600d manufactured by Konica Minolta.
- the retardation film has a total light transmittance of preferably 80% or more, more preferably 85% or more, and particularly preferably 90% or more, regardless of the thickness. If the transmittance is not less than the above lower limit, a film with little coloring is obtained, and when it is bonded to a polarizing plate, it becomes a circularly polarizing plate with a high degree of polarization and transmittance, and when used in an image display device, a high display quality. Can be realized.
- the upper limit of the total light transmittance of the film of the present invention is not particularly limited, but is usually 99% or less.
- the retardation film preferably has a retardation change rate of 5% or less in reliability evaluation described later, more preferably 4% or less, and particularly preferably 3% or less.
- rate of change is larger than the above range, for example, when used in an anti-reflection circularly polarizing plate in an organic EL panel, the optical properties of the retardation film change under the use environment, and the reflectance increases. It causes deterioration of screen quality such as color loss.
- the retardation film does not undergo brittle fracture in a bending test described later in the state of an unstretched film before stretching.
- the film In a film in which brittle fracture occurs, the film is likely to be broken at the time of film formation or stretching, and the production yield may be deteriorated.
- it is important to design the molecular weight, melt viscosity, and glass transition temperature of the resin used in the present invention within the aforementioned preferred ranges.
- a method of adjusting the characteristics of the film by copolymerizing or blending components capable of imparting flexibility is also effective.
- thermoplastic resin used for retardation film of present invention is a thermoplastic resin that can form a film by a melt film forming method and is excellent in stretch processability.
- the glass transition temperature of the resin is preferably 120 ° C. or higher and 160 ° C. or lower, more preferably 125 ° C. or higher and 155 ° C. or lower, and particularly preferably 130 ° C. or higher and 150 ° C. or lower. If the glass transition temperature is excessively low, the heat resistance tends to deteriorate, and there is a possibility that dimensional changes will occur after film formation, and the reliability of quality under the use conditions of the retardation film may deteriorate. On the other hand, if the glass transition temperature is excessively high, unevenness of the film thickness may occur during film formation, the film may become brittle, the stretchability may deteriorate, and the transparency of the film may be impaired.
- the resin preferably has an elastic modulus of 1 GPa or more and 2.5 GPa or less, more preferably 1.1 GPa or more and 2.3 GPa or less, and particularly preferably 1.2 GPa or more and 2.2 GPa or less. preferable.
- the film has excellent handling properties and strength.
- stress may remain in the stretched film, and a polarizing plate may be produced by laminating with other films or the like. Stress may be generated on the film when placed under humidity.
- the phase difference changes as shown in the following equation, which may cause an increase in reflectance and a decrease in screen quality such as color loss.
- the change in phase difference can be reduced by reducing the photoelastic coefficient.
- the elastic modulus of the resin is reduced, the generated stress can be reduced, and as a result, the change in phase difference can be suppressed to a low level.
- the elasticity modulus of a phase difference film is measured by the dynamic viscoelasticity measurement mentioned later.
- the melt viscosity of the resin is preferably 700 Pa ⁇ s or more and 5000 Pa ⁇ s or less under measurement conditions of a temperature of 240 ° C. and a shear rate of 91.2 sec ⁇ 1 . Furthermore, 800 Pa ⁇ s or more and 4000 Pa ⁇ s or less are preferable, and 900 Pa ⁇ s or more and 3500 Pa ⁇ s or less are particularly preferable.
- the resin having the melt viscosity in the specific range is excellent in film strength and stretchability, and is also excellent in melt moldability. The melt viscosity is measured using a capillary rheometer (manufactured by Toyo Seiki Co., Ltd.).
- the resin preferably has a saturated water absorption greater than 1.0% by mass. If the saturated water absorption is greater than 1.0% by mass, the adhesiveness tends to be easily secured when the film made of the resin is bonded to another film or the like. For example, since the film is hydrophilic when bonded to the polarizing plate, the contact angle of water is low, the adhesive can be easily designed freely, and a high adhesion design can be achieved. When the saturated water absorption is 1.0% by mass or less, it becomes hydrophobic and the contact angle of water is high, making it difficult to design adhesiveness.
- the film tends to be easily charged, and there is a tendency that the appearance defect is increased when the film is incorporated into a circularly polarizing plate or an image display device, such as the inclusion of foreign matter.
- the saturated water absorption is larger than 3.0% by mass, the durability of the optical characteristics in a humidity environment tends to deteriorate, which is not preferable.
- the film of the present invention preferably has a saturated water absorption rate of more than 1.0% by mass, more preferably 1.1% by mass or more, and preferably 3.0% by mass or less. More preferably, it is 5 mass% or less.
- the saturated water absorption rate may be 1.0% by mass or less depending on the use conditions of the film and the image display device using the film.
- thermoplastic resin used in the retardation film of the present invention contains at least one linking group out of a carbonate bond and an ester bond and a specific structural unit derived from a divalent oligofluorene described later. preferable. That is, as the resin, polycarbonate, polyester or polyester carbonate containing the specific structural unit can be suitably used.
- the resin having such a configuration is excellent in heat resistance, mechanical properties, melt processability, and the like, and it is easy to control the optical properties of the retardation film described above within a desired range by copolymerizing a plurality of monomers. Has the advantage.
- the retardation film of this invention may contain other synthetic resins, additives, etc. as needed other than the said resin so that it may mention later.
- the resin is one of a group consisting of a structural unit represented by the following general formula (1) and a structural unit represented by the following general formula (2) as a specific structural unit derived from the divalent oligofluorene. It is preferable to have more than one type of structural unit.
- the structural unit may be referred to as an oligofluorene structural unit.
- R 1 to R 3 are each independently an alkylene group having 1 to 4 carbon atoms which may have a direct bond or a substituent
- 4 to R 9 are each independently a hydrogen atom, an optionally substituted alkyl group having 1 to 10 carbon atoms, an optionally substituted aryl group having 4 to 10 carbon atoms, or a substituted group.
- at least two groups adjacent to each other among R 4 to R 9 may be bonded to each other to form a ring.
- R 1 and R 2 as the “optionally substituted alkylene group having 1 to 4 carbon atoms”, for example, the following alkylene groups can be employed.
- Linear alkylene group such as methylene group, ethylene group, n-propylene group, n-butylene group; methylmethylene group, dimethylmethylene group, ethylmethylene group, propylmethylene group, (1-methylethyl) methylene group, 1 -Methylethylene group, 2-methylethylene group, 1-ethylethylene group, 2-ethylethylene group, 1-methylpropylene group, 2-methylpropylene group, 1,1-dimethylethylene group, 2,2-dimethylpropylene group , A branched alkylene group such as a 3-methylpropylene group.
- the position of the branched chain in R 1 and R 2 is indicated by a number assigned so that the carbon on the fluorene ring side is in the first position.
- R 1 and R 2 has a particularly important influence on the development of reverse wavelength dispersion.
- the resin exhibits the strongest reverse wavelength dispersibility in a state where the fluorene ring is oriented perpendicular to the main chain direction (stretching direction).
- R 1 and R 2 having 2 to 3 carbon atoms on the main chain of the alkylene group. .
- the number of carbon atoms is 1, surprisingly, reverse wavelength dispersion may not be exhibited.
- the orientation of the fluorene ring is fixed in a direction that is not perpendicular to the main chain direction due to the steric hindrance of the carbonate group or ester group that is the linking group of the oligofluorene structural unit.
- the reverse wavelength dispersibility may be weakened due to weak fixation of the orientation of the fluorene ring.
- the heat resistance of the resin also decreases.
- R 1 and R 2 are either an oxygen atom or a carbonyl carbon in which one end of the alkylene group is bonded to the fluorene ring and the other end is included in the linking group. It is bound to crab. From the viewpoints of thermal stability, heat resistance, and reverse wavelength dispersion, it is preferable that the other end of the alkylene group is bonded to the carbonyl carbon.
- a diol or diester structure hereinafter, the diester also includes a dicarboxylic acid
- polymerization is preferably performed using the diester as a raw material.
- R 3 as the “optionally substituted alkylene group having 1 to 4 carbon atoms”, for example, the following alkylene groups can be employed.
- Linear alkylene group such as methylene group, ethylene group, n-propylene group, n-butylene group; methylmethylene group, dimethylmethylene group, ethylmethylene group, propylmethylene group, (1-methylethyl) methylene group, 1 -Methylethylene group, 2-methylethylene group, 1-ethylethylene group, 2-ethylethylene group, 1-methylpropylene group, 2-methylpropylene group, 1,1-dimethylethylene group, 2,2-dimethylpropylene group , An alkylene group having a branched chain such as a 3-methylpropylene group.
- R 3 preferably has 1 to 2 carbon atoms on the main chain of the alkylene group, and particularly preferably 1 carbon atom.
- R 3 having too many carbons on the main chain is adopted, the fixation of the fluorene ring is weakened similarly to R 1 and R 2 , the reverse wavelength dispersion is decreased, the photoelastic coefficient is increased, and the heat resistance is decreased. Etc. may be caused.
- the smaller the number of carbons on the main chain the better the optical properties and heat resistance, but the thermal stability deteriorates when the 9-positions of the two fluorene rings are connected by a direct bond.
- R 1 to R 3 the substituents exemplified below can be employed as the substituent that the alkylene group may have, but substituents other than these may be employed.
- a halogen atom selected from a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkoxy group having 1 to 10 carbon atoms such as a methoxy group and an ethoxy group; an acyl group having 1 to 10 carbon atoms such as an acetyl group and a benzoyl group; An acylamino group having 1 to 10 carbon atoms such as an acetamido group and a benzoylamide group; a nitro group; a cyano group; 1 to 3 by the halogen atom, the alkoxy group, the acyl group, the acylamino group, the nitro group, the cyano group, etc.
- the number of the substituents is not particularly limited, but 1 to 3 is preferable.
- the types of the substituents may be the same or different. If the number of substituents is too large, the reaction may be inhibited during the polymerization or thermally decomposed. Further, from the viewpoint that it can be produced industrially at low cost, it is preferable that R 1 to R 3 are unsubstituted.
- R 4 to R 9 as the “optionally substituted alkyl group having 1 to 10 carbon atoms”, for example, the following alkyl groups can be employed.
- Linear alkyl groups such as methyl, ethyl, n-propyl, n-butyl, n-pentyl, n-hexyl, n-decyl; isopropyl, 2-methylpropyl, 2,2- A branched alkyl group such as dimethylpropyl group or 2-ethylhexyl group; a cyclic alkyl group such as cyclopropyl group, cyclopentyl group, cyclohexyl group or cyclooctyl group;
- the carbon number of the alkyl group is preferably 4 or less, more preferably 2 or less. Within this range, steric hindrance between fluorene rings is unlikely to occur, and desired optical properties derived from the fluorene ring tend to be obtained.
- R 4 to R 9 the substituents exemplified below can be adopted as the substituent that the alkyl group may have, but substituents other than these may be adopted.
- a halogen atom selected from a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkoxy group having 1 to 10 carbon atoms such as a methoxy group and an ethoxy group; an acyl group having 1 to 10 carbon atoms such as an acetyl group and a benzoyl group; An acylamino group having 1 to 10 carbon atoms such as an acetamido group and a benzoylamide group; a nitro group; a cyano group; 1 to 3 by the halogen atom, the alkoxy group, the acyl group, the acylamino group, the nitro group, the cyano group, etc.
- the number of the substituents is not particularly limited, but 1 to 3 is preferable.
- the types of the substituents may be the same or different.
- the reaction may be inhibited during the polymerization or may be thermally decomposed. Further, from the viewpoint that it can be produced industrially at low cost, it is preferable that R 4 to R 9 are unsubstituted.
- alkyl group examples include a trifluoromethyl group, a benzyl group, a 4-methoxybenzyl group, and a methoxymethyl group.
- R 4 to R 9 as the “optionally substituted aryl group having 4 to 10 carbon atoms”, for example, the following aryl groups can be employed.
- Aryl groups such as phenyl, 1-naphthyl and 2-naphthyl; heteroaryl groups such as 2-pyridyl, 2-thienyl and 2-furyl.
- the number of carbon atoms of the aryl group is preferably 8 or less, and more preferably 7 or less. Within this range, steric hindrance between fluorene rings is unlikely to occur, and desired optical properties derived from the fluorene ring tend to be obtained.
- R 4 to R 9 the substituents exemplified below can be employed as the substituent that the aryl group may have, but substituents other than these may be employed.
- a halogen atom selected from a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkyl group having 1 to 10 carbon atoms such as a methyl group, an ethyl group and an isopropyl group; and a C 1 to 10 carbon atom such as a methoxy group and an ethoxy group
- the number of the substituents is not particularly limited, but 1 to 3 is preferable.
- the types of the substituents may be the same or different. Further, from the viewpoint that it can be produced industrially at low cost, it is preferable that R 4 to R 9 are unsubstituted.
- aryl group examples include 2-methylphenyl group, 4-methylphenyl group, 3,5-dimethylphenyl group, 4-benzoylphenyl group, 4-methoxyphenyl group, 4-nitrophenyl group, 4-cyano Phenyl group, 3-trifluoromethylphenyl group, 3,4-dimethoxyphenyl group, 3,4-methylenedioxyphenyl group, 2,3,4,5,6-pentafluorophenyl group, 4-methylfuryl group, etc. Is mentioned.
- acyl groups such as formyl group, acetyl group, propionyl group, 2-methylpropionyl group, 2,2-dimethylpropionyl group, 2-ethylhexanoyl group; benzoyl group, 1-naphthylcarbonyl group, 2-naphthylcarbonyl group An aromatic acyl group such as 2-furylcarbonyl group.
- the number of carbon atoms of the acyl group is preferably 4 or less, and more preferably 2 or less. Within this range, steric hindrance between fluorene rings is unlikely to occur, and desired optical properties derived from the fluorene ring tend to be obtained.
- R 4 to R 9 the substituents exemplified below can be employed as the substituent that the acyl group may have, but other substituents may be employed.
- a halogen atom selected from a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkyl group having 1 to 10 carbon atoms such as a methyl group, an ethyl group and an isopropyl group; and a C 1 to 10 carbon atom such as a methoxy group and an ethoxy group
- the number of the substituents is not particularly limited, but 1 to 3 is preferable.
- the types of the substituents may be the same or different. Further, from the viewpoint that it can be produced industrially at low cost, it is preferable that R 4 to R 9 are unsubstituted.
- acyl group examples include a chloroacetyl group, a trifluoroacetyl group, a methoxyacetyl group, a phenoxyacetyl group, a 4-methoxybenzoyl group, a 4-nitrobenzoyl group, a 4-cyanobenzoyl group, and a 4-trifluoromethylbenzene.
- examples include a soil group.
- alkoxy groups having 1 to 10 carbon atoms or aryloxy group for example, the following alkoxy groups and aryloxy groups can be employed.
- Alkoxy groups such as methoxy group, ethoxy group, isopropoxy group, tert-butoxy group, trifluoromethoxy group and phenoxy group;
- the number of carbon atoms of the alkoxy group and the aryloxy group is preferably 4 or less, and more preferably 2 or less. Within this range, steric hindrance between fluorene rings is unlikely to occur, and desired optical properties derived from the fluorene ring tend to be obtained.
- a halogen atom selected from a fluorine atom, a chlorine atom, a bromine atom and an iodine atom; an alkyl group having 1 to 10 carbon atoms such as a methyl group, an ethyl group and an isopropyl group; and a C 1 to 10 carbon atom such as a methoxy group and an ethoxy group
- the number of the substituents is not particularly limited, but 1 to 3 is preferable.
- the types of the substituents may be the same or different. Further, from the viewpoint that it can be produced industrially at low cost, it is preferable that R 4 to R 9 are unsubstituted.
- alkoxy group and the aryloxy group include chloromethyl group, bromomethyl group, 2-bromoethyl group, trifluoromethyl group, methoxymethyl group, methoxyethoxymethyl group, 3-chlorophenoxy group, 3-bromophenoxy group.
- R 4 to R 9 as the “optionally substituted acyloxy group having 1 to 10 carbon atoms”, for example, the following acyloxy groups can be employed.
- An aliphatic acyloxy group such as a formyloxy group, an acetyloxy group, a propanoyloxy group, a butanoyloxy group, an acrylyloxy group and a methacrylyloxy group; an aromatic acyloxy group such as a benzoyloxy group.
- the number of carbon atoms of the acyloxy group is preferably 4 or less, and more preferably 2 or less. Within this range, steric hindrance between fluorene rings is unlikely to occur, and desired optical properties derived from the fluorene ring tend to be obtained.
- the number of the substituents is not particularly limited, but 1 to 3 is preferable.
- the types of the substituents may be the same or different. Further, from the viewpoint that it can be produced industrially at low cost, it is preferable that R 4 to R 9 are unsubstituted.
- acyloxy group examples include chloroacetyloxy group, trifluoroacetyloxy group, methoxyacetyloxy group, phenoxyacetyloxy group, 4-methoxybenzoyloxy group, 4-nitrobenzoyloxy group, 4-cyanobenzoyloxy group 4-trifluoromethyl benzoyloxy group and the like.
- amino groups can be employed, but other amino groups are employed. It is also possible to do.
- Amino group N-methylamino group, N, N-dimethylamino group, N-ethylamino group, N, N-diethylamino group, N, N-methylethylamino group, N-propylamino group, N, N-di Aliphatic amino groups such as propylamino group, N-isopropylamino group, N, N-diisopropylamino group; aromatic amino groups such as N-phenylamino group, N, N-diphenylamino group; formamide group, acetamide group, Acylamino groups such as decanoylamide group, benzoylamide group, chloroacetamide group; alkoxycarbonylamino groups such as benzyloxycarbonylamino group,
- amino group examples include N, N-dimethylamino group, N-ethylamino group, and N, N-diethylamino which do not have protons with high acidity, have a small molecular weight, and have a tendency to increase the fluorene ratio. It is preferable to employ a group, and it is more preferable to employ an N, N-dimethylamino group.
- R 4 to R 9 as the “optionally substituted vinyl group or ethynyl group having 1 to 10 carbon atoms”, for example, the following vinyl group and ethynyl group can be employed. It is also possible to employ vinyl groups other than these. Vinyl group, 2-methylvinyl group, 2,2-dimethylvinyl group, 2-phenylvinyl group, 2-acetylvinyl group, ethynyl group, methylethynyl group, tert-butylethynyl group, phenylethynyl group, acetylethynyl group, Trimethylsilylethynyl group.
- the number of carbon atoms of the vinyl group and the ethynyl group is preferably 4 or less. Within this range, steric hindrance between fluorene rings is unlikely to occur, and desired optical properties derived from the fluorene ring tend to be obtained. Further, since the conjugated system of the fluorene ring becomes longer, it becomes easier to obtain stronger reverse wavelength dispersion.
- sulfur-containing groups can be adopted, but other sulfur-containing groups can also be adopted.
- a methylsulfinyl group an ethylsulfinyl group, or a phenylsulfinyl group that does not have a proton with high acidity, has a low molecular weight, and can increase the fluorene ratio, and is a methylsulfinyl group. Is more preferable.
- R 4 to R 9 as the “substituent silicon atom”, for example, the following silyl groups can be employed.
- Trialkylsilyl groups such as trimethylsilyl group and triethylsilyl group; trialkoxysilyl groups such as trimethoxysilyl group and triethoxysilyl group.
- a trialkylsilyl group that can be handled stably is preferable.
- halogen atom a fluorine atom, a chlorine atom, a bromine atom, or an iodine atom can be employed.
- a fluorine atom, a chlorine atom, or a bromine atom which is relatively easy to introduce and has a tendency to increase the reactivity of the fluorene 9-position because it has an electron withdrawing property. It is more preferable to employ an atom or a bromine atom.
- R 4 to R 9 may be bonded to each other to form a ring.
- Specific examples thereof include substituted fluorene structures having a skeleton exemplified in the following group [A].
- the fluorene ring contained in the oligofluorene structural unit has a structure in which all of R 4 to R 9 are hydrogen atoms, or R 4 and / or R 9 are halogen atoms, acyl groups, nitro groups, cyano groups, and sulfo groups. It is preferably any one selected from the group consisting of groups, and any structure in which R 5 to R 8 are hydrogen atoms.
- the compound containing the oligofluorene structural unit can be derived from fluorene which is industrially inexpensive.
- the fluorene ring is selected from a group in which all of R 4 to R 9 are hydrogen atoms, or R 4 and / or R 9 are selected from the group consisting of a fluorine atom, a chlorine atom, a bromine atom, and a nitro group. It is more preferable that R 5 to R 8 are hydrogen atoms, and a structure in which all of R 4 to R 9 are hydrogen atoms is particularly preferable.
- a preferable structure includes a structure having a skeleton specifically exemplified in the following [B] group.
- the oligofluorene structural unit is a structural unit derived from 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene which has been widely used conventionally (the following structural formula (9)) or 9,9-bis (4 Compared with a structural unit derived from (hydroxy-methyl-3-methylphenyl) fluorene (the following structural formula (10)), it has the following characteristics.
- an aromatic component such as a phenyl ring incorporated in the main chain of the polymer is not incorporated in the main chain of the polymer, so that the photoelastic coefficient can be reduced.
- the aromatic component incorporated in the main chain exhibits positive wavelength dispersibility in which the birefringence increases as the wavelength is shorter, conventionally, the reverse wavelength dispersibility derived from the fluorene ring of the side chain is offset, and the resin The reverse wavelength dispersion as a whole has deteriorated.
- the aromatic component when the aromatic component is not incorporated into the main chain, the reverse wavelength dispersion can be expressed more strongly.
- -High heat resistance can be imparted by introducing two fluorene rings in one molecule.
- the main chain is composed of a flexible alkylene chain, flexibility and melt processability can be imparted to the resin.
- Examples of the method of introducing the oligofluorene structural unit into the resin include a method of copolymerizing a diol or diester having the oligofluorene structural unit with another diol or diester.
- a polycarbonate can be obtained by performing polymerization with a combination of a diol and a carbonic acid diester represented by the following general formula (11).
- polyester can be obtained by superposing
- polyester carbonate can be obtained by superposing
- a 1 and A 2 are each an aliphatic hydrocarbon group having 1 to 18 carbon atoms which may have a substituent, or an aromatic carbon which may have a substituent. It is a hydrogen group, and A 1 and A 2 may be the same or different.
- Examples of the monomer having an oligofluorene structural unit include a specific diol represented by the following general formula (12) and a specific diester represented by the following general formula (13).
- R 1 to R 3 are each independently a direct bond or an alkylene group having 1 to 4 carbon atoms which may have a substituent
- R 4 R 9 is independently a hydrogen atom, an optionally substituted alkyl group having 1 to 10 carbon atoms, an optionally substituted aryl group having 4 to 10 carbon atoms, or a substituent.
- An optionally substituted acyl group having 1 to 10 carbon atoms, an optionally substituted alkoxy group having 1 to 10 carbon atoms, and an optionally substituted aryl having 1 to 10 carbon atoms An oxy group, an optionally substituted acyloxy group having 1 to 10 carbon atoms, an amino group optionally having substituents, and a vinyl group having 1 to 10 carbon atoms optionally having a substituent , An optionally substituted ethynyl group having 1 to 10 carbon atoms, a sulfur atom having a substituent, A silicon atom, a halogen atom having an group, a nitro group, or a cyano group.
- a 3 and A 4 are each a hydrogen atom, an aliphatic hydrocarbon group having 1 to 18 carbon atoms which may have a substituent, or an aromatic hydrocarbon group which may have a substituent, A 3 and A 4 may be the same or different.
- the monomer having a divalent oligofluorene structural unit it is preferable to use a specific diester represented by the general formula (13).
- the specific diester is relatively better in thermal stability than the specific diol represented by the general formula (12), and the fluorene ring in the polymer is oriented in a preferred direction, resulting in stronger reverse wavelength dispersion. There is a tendency to show sex.
- polyester carbonate in which the specific diester having an oligofluorene structural unit is incorporated in the structure of polycarbonate is particularly preferable.
- a 3 and A 4 in the general formula (13) are a hydrogen atom or an aliphatic hydrocarbon group such as a methyl group or an ethyl group, the polymerization reaction is unlikely to occur under the polymerization conditions of the polycarbonate usually used. There is. Therefore, A 3 and A 4 in the general formula (13) are preferably aromatic hydrocarbon groups.
- a 1 to A 4 are particularly preferably phenyl groups.
- the component that is eliminated during the polymerization reaction is phenol.
- the retardation film of the present invention in order to obtain positive refractive index anisotropy and sufficient reverse wavelength dispersion, it has a component having positive refractive index anisotropy and a negative refractive index anisotropy. In addition, it is necessary to blend a component having a large refractive index wavelength dispersion (wavelength dependence) at an appropriate ratio. Examples of methods for adjusting these ratios include a method of copolymerizing a monomer having a positive refractive index anisotropy and a monomer having a negative refractive index anisotropy, and a resin having a positive refractive index anisotropy. And a resin having a negative refractive index anisotropy. The method of synthesizing the resin by copolymerization is preferable because the content of each component can be precisely controlled, high transparency is obtained, and uniform characteristics are obtained over the entire surface of the film.
- components constituting general-purpose linear polymers have positive refractive index anisotropy.
- the component having positive refractive index anisotropy include components constituting polyethylene, polypropylene, cycloolefin polymer, polycarbonate, polyester, nylon and the like.
- the component having negative refractive index anisotropy include 9,9-bis [4- (2-hydroxyethoxy) phenyl] fluorene, 9,9-bis (4-hydroxy-3-methylphenyl) fluorene,
- the content of the oligofluorene structural unit in the resin is 1% by mass or more and 40% by mass or less with respect to the entire resin. It is preferably 10% by mass or more and 35% by mass or less, more preferably 15% by mass or more and 30% by mass or less, and particularly preferably 18% by mass or more and 25% by mass or less. If the content of the oligofluorene structural unit is too large, the reverse wavelength dispersibility of the fluorene ring may be insufficient, and the photoelastic coefficient and reliability may deteriorate, or high birefringence may not be obtained by stretching. There is.
- the proportion of the oligofluorene structural unit in the resin is high, the molecular design range is narrowed, and it is difficult to improve when modification of the resin is required.
- the optical characteristics change sensitively according to slight variations in the content of oligofluorene. For this reason, it becomes difficult to manufacture the various characteristics within a certain range.
- the said resin can use the dihydroxy compound and diester compound which are illustrated below other than the monomer represented by the said General formula (12) and General formula (13).
- the resin contains a structural unit represented by the following general formula (3) as a copolymerization component from the viewpoint of optical properties, mechanical properties, heat resistance, and the like.
- Examples of the dihydroxy compound into which the structural unit represented by the general formula (3) can be introduced include isosorbide (ISB), isomannide, and isoide which are related to stereoisomers. These may be used individually by 1 type and may be used in combination of 2 or more type. Among these, it is most preferable to use ISB from the viewpoint of availability and polymerization reactivity.
- the structural unit represented by the general formula (3) is preferably contained in the resin in an amount of 5% by mass to 70% by mass, and preferably 10% by mass to 65% by mass. More preferably, it is particularly preferably 20% by mass or more and 60% by mass or less.
- the structural unit represented by the said General formula (3) is preferably contained in the resin in an amount of 5% by mass to 70% by mass, and preferably 10% by mass to 65% by mass. More preferably, it is particularly preferably 20% by mass or more and 60% by mass or less.
- the structural unit represented by the general formula (3) is a highly hygroscopic structure, when the content is excessively large, the water absorption rate of the resin becomes high, and the dimensional deformation occurs in a high humidity environment. There is a concern that will happen.
- the resin may further contain another structural unit in combination with the structural unit of the general formula (3) or without using the structure of the general formula (3). (Hereinafter, such a structural unit may be referred to as “other structural unit”.)
- the other structural units described above have structural units represented by the following general formulas (4) to (8) that do not contain an aromatic component.
- R 10 represents an alkylene group having 2 to 20 carbon atoms which may have a substituent.
- dihydroxy compound into which the structural unit of the general formula (4) can be introduced for example, the following dihydroxy compounds can be employed.
- Dihydroxy compounds of linear aliphatic hydrocarbons such as diol, 1,9-nonanediol, 1,10-decanediol, 1,12-dodecanediol; dihydroxy compounds of branched aliphatic hydrocarbons such as neopentyl glycol and hexylene glycol Compound.
- R 11 represents a cycloalkylene group having 4 to 20 carbon atoms which may have a substituent.
- dihydroxy compound into which the structural unit of the general formula (5) can be introduced for example, the following dihydroxy compounds can be employed.
- R 12 represents a cycloalkylene group having 4 to 20 carbon atoms which may have a substituent.
- dihydroxy compound into which the structural unit of the general formula (6) can be introduced for example, the following dihydroxy compounds can be employed.
- 1,2-cyclohexanedimethanol, 1,3-cyclohexanedimethanol, 1,4-cyclohexanedimethanol, tricyclodecane dimethanol, pentacyclopentadecane dimethanol, 2,6-decalin dimethanol, 1,5-decalindi Examples include dihydroxy compounds derived from terpene compounds such as methanol, 2,3-decalin dimethanol, 2,3-norbornane dimethanol, 2,5-norbornane dimethanol, 1,3-adamantane dimethanol and limonene.
- a dihydroxy compound which is a primary alcohol of an alicyclic hydrocarbon for example, the following dihydroxy compounds can be employed.
- R 13 represents an optionally substituted alkylene group having 2 to 10 carbon atoms, and p is an integer of 1 to 40.
- dihydroxy compound into which the structural unit of the general formula (7) can be introduced for example, the following dihydroxy compounds can be employed.
- Oxyalkylene glycols such as diethylene glycol, triethylene glycol, tetraethylene glycol, polyethylene glycol, and polypropylene glycol.
- R 14 represents a group having an acetal ring having 2 to 20 carbon atoms which may have a substituent.
- Examples of the dihydroxy compound capable of introducing the structural unit represented by the general formula (8) include, for example, spiroglycol represented by the following structural formula (14), dioxane glycol represented by the following structural formula (15), and the like. Can do.
- a dihydroxy compound containing an aromatic component exemplified below may be used.
- dicarboxylic acids can be employed as a diester compound that can be used for copolymerization of the resin.
- dicarboxylic acids Terephthalic acid, phthalic acid, isophthalic acid, 4,4'-diphenyldicarboxylic acid, 4,4'-diphenyl ether dicarboxylic acid, 4,4'-benzophenone dicarboxylic acid, 4,4'-diphenoxyethanedicarboxylic acid, 4,4 '-Diphenylsulfone dicarboxylic acid, aromatic dicarboxylic acid such as 2,6-naphthalenedicarboxylic acid; 1,2-cyclohexanedicarboxylic acid, 1,3-cyclohexanedicarboxylic acid, alicyclic dicarboxylic acid such as 1,4-cyclohexanedicarboxylic acid Acid; aliphatic dicarboxylic acids such as malonic acid, succinic acid, glutaric acid, adipic acid,
- dicarboxylic acid components can be used as the raw material of the polyester carbonate as the dicarboxylic acid itself.
- dicarboxylic acid esters such as methyl ester and phenyl ester
- dicarboxylic acids such as dicarboxylic acid halides
- An acid derivative can also be used as a raw material.
- those other structural units that do not contain an aromatic component are preferable to use. If the main chain of the polymer contains an aromatic component, the reverse wavelength dispersion of the fluorene ring is offset as described above, so the content of oligofluorene structural units must be increased, and photoelasticity There is concern that the coefficient will deteriorate.
- the other structural unit that does not contain an aromatic component it is possible to prevent the aromatic component from being incorporated into the main chain derived from the structural unit.
- the aromatic component can be introduced into the polymer by the other structural unit containing the aromatic component.
- the structural unit containing an aromatic group in the resin excluding the structural unit represented by the general formula (1) and the structural unit represented by the general formula (2)) .
- 1,4-cyclohexanedimethanol tricyclodecane dimethanol, spiroglycol, 1,4-cyclohexanedicarboxylic acid (and its derivatives) as the monomer having the other structural units listed above.
- Resins containing structural units derived from these monomers have an excellent balance of optical properties, heat resistance, mechanical properties, and the like.
- the diester compound has relatively low polymerization reactivity, when synthesizing a polyester carbonate using the specific diester represented by the general formula (13), from the viewpoint of increasing the reaction efficiency, It is preferable not to use a diester other than a specific diester.
- ⁇ Dihydroxy compounds and diester compounds for introducing other structural units may be used alone or in combination of two or more according to the required performance of the obtained resin.
- the content of other structural units in the resin is preferably 1% by mass or more and 60% by mass or less, more preferably 5% by mass or more and 55% by mass or less, and particularly preferably 10% by mass or more and 50% by mass or less.
- Other structural units play a role in adjusting the heat resistance of the resin and imparting flexibility and toughness, so if the content is too small, the mechanical properties and melt processability of the resin will deteriorate, and the content will be too high. And heat resistance and optical characteristics may be deteriorated.
- the polycarbonate, polyester, and polyester carbonate used in the present invention can be produced by a generally used polymerization method. That is, the resin can be produced using, for example, a solution polymerization method or an interfacial polymerization method using phosgene or a carboxylic acid halide, or a melt polymerization method in which a reaction is performed without using a solvent. Among these production methods, it is preferable to produce by a melt polymerization method that can reduce environmental burden because it does not use a solvent or a highly toxic compound, and is excellent in productivity.
- the glass transition temperature of the resin is lowered due to the plasticizing effect of the residual solvent in the resin, so that it is difficult to control the molecular orientation uniformly in the stretching step described later.
- a halogen-based organic solvent such as methylene chloride
- the resin obtained by the melt polymerization method does not contain a solvent, it is advantageous for stabilization of processing steps and product quality.
- the resin is produced by the melt polymerization method
- a monomer used as a raw material and a polymerization catalyst are mixed, subjected to a transesterification reaction under melting, and the reaction rate is increased while removing a desorbing component out of the system.
- the reaction proceeds to the target molecular weight under conditions of high temperature and high vacuum.
- the reaction is completed, the molten resin is extracted from the reactor to obtain a resin raw material used for the retardation film.
- Examples of the carbonic acid diester used in the polycondensation reaction include those represented by the general formula (11) described above. These carbonic acid diesters may be used alone or in combination of two or more.
- a 1 and A 2 are each an aliphatic hydrocarbon group having 1 to 18 carbon atoms which may have a substituent, or an aromatic carbon which may have a substituent. It is a hydrogen group, and A 1 and A 2 may be the same or different.
- a 1 and A 2 are preferably substituted or unsubstituted aromatic hydrocarbon groups, more preferably unsubstituted aromatic hydrocarbon groups.
- substituent of the aliphatic hydrocarbon group include an ester group, an ether group, a carboxylic acid, an amide group, and a halogen.
- substituent of the aromatic hydrocarbon group include an alkyl group such as a methyl group and an ethyl group. Is mentioned.
- Examples of the carbonic acid diester represented by the general formula (11) include substituted diphenyl carbonates such as diphenyl carbonate (DPC) and ditolyl carbonate, dimethyl carbonate, diethyl carbonate, and di-tert-butyl carbonate. Diphenyl carbonate and substituted diphenyl carbonate are preferable, and diphenyl carbonate is particularly preferable.
- Carbonic acid diesters may contain impurities such as chloride ions, which may inhibit the polymerization reaction or worsen the hue of the resulting polycarbonate. It is preferable to use one.
- the reaction rate and the molecular weight of the resulting resin can be controlled by strictly adjusting the molar ratio of all dihydroxy compounds and diester compounds used in the reaction.
- the molar ratio of the carbonic acid diester to the total dihydroxy compound is preferably adjusted to 0.90 to 1.10, more preferably 0.96 to 1.05, and 0.98 to 1. It is particularly preferable to adjust to 03.
- the molar ratio of all diester compounds to all dihydroxy compounds is preferably adjusted to 0.70 to 1.10, more preferably 0.80 to 1.05, and more preferably 0.85 to 1. It is particularly preferable to adjust to 0.00.
- the molar ratio of the total amount of carbonic diester and all diester compounds to all dihydroxy compounds is preferably adjusted to 0.90 to 1.10, and can be adjusted to 0.96 to 1.05. More preferably, adjustment to 0.98 to 1.03 is particularly preferable.
- the molar ratio deviates greatly in the vertical direction, a resin having a desired molecular weight cannot be produced. Moreover, when the said molar ratio becomes small too much, the hydroxyl-group terminal of manufactured resin will increase and the thermal stability of resin may deteriorate. If the molar ratio is too large, the rate of the transesterification reaction decreases under the same conditions, or the residual amount of carbonic diester or diester compound in the produced resin increases. Volatilization may occur during film formation or stretching, leading to film defects.
- the melt polymerization method is usually carried out in a multistage process of two or more stages.
- the polycondensation reaction may be carried out in two or more steps by changing the conditions sequentially using one polymerization reactor, or two or more steps by changing the respective conditions using two or more reactors.
- the polycondensation reaction may be any of a batch system, a continuous system, or a combination of a batch system and a continuous system, but a continuous system is preferable from the viewpoint of production efficiency and quality stability.
- the polymerization rate of the polycondensation reaction is controlled by the balance between the hydroxy group end and the ester group end or carbonate group end. Therefore, particularly in the case of performing polymerization in a continuous manner, if the balance of the end groups varies due to the distillation of unreacted monomers, it is difficult to control the polymerization rate to be constant, and the variation in the molecular weight of the resulting resin may increase. There is. Since the molecular weight of the resin correlates with the melt viscosity, when melt-forming the obtained resin, the melt viscosity fluctuates, making it difficult to keep the film thickness and other quality constant. It causes a decline in sex.
- the wavelength dispersion of retardation which will be described later, is controlled by the ratio of each structural unit in the resin. If the ratio is lost during polymerization, optical characteristics as designed cannot be obtained. If the film is trapped or a long film is obtained, the optical characteristics may change depending on the position of the film, and a polarizing plate with a certain quality may not be manufactured.
- the maximum internal temperature of the polymerization reactor is usually 130 ° C or higher, preferably 150 ° C or higher, more preferably 170 ° C or higher, and usually 250 ° C or lower, preferably 240 ° C or lower, more preferably 230 ° C or lower. Set within the range.
- the pressure in the polymerization reactor is usually 70 kPa or less (hereinafter, pressure represents an absolute pressure), preferably 50 kPa or less, more preferably 30 kPa or less, and usually 1 kPa or more, preferably 3 kPa or more, more preferably 5 kPa. Set in the above range.
- the reaction time is usually set in the range of 0.1 hour or longer, preferably 0.5 hour or longer, and usually 10 hours or shorter, preferably 5 hours or shorter, more preferably 3 hours or shorter.
- the first-stage reaction is carried out while distilling out the generated monohydroxy compound derived from the diester compound to the outside of the reaction system.
- the monohydroxy compound distilled out of the reaction system in the first stage reaction is phenol.
- the lower the reaction pressure the more the polymerization reaction can be promoted.
- the unreacted monomer is distilled off more.
- it is effective to use a reactor equipped with a reflux condenser In order to achieve both suppression of unreacted monomer distillation and promotion of reaction by reduced pressure, it is effective to use a reactor equipped with a reflux condenser. In particular, it is preferable to use a reflux condenser at the beginning of the reaction with a large amount of unreacted monomers.
- the pressure of the reaction system is gradually lowered from the pressure of the first stage, and the monohydroxy compound generated subsequently is removed from the reaction system, and finally the pressure of the reaction system is 5 kPa or less. , Preferably 3 kPa or less, more preferably 1 kPa or less.
- the maximum internal temperature is usually set to 210 ° C. or higher, preferably 220 ° C. or higher, and usually 270 ° C. or lower, preferably 260 ° C. or lower.
- the reaction time is usually 0.1 hours or longer, preferably 0.5 hours or longer, more preferably 1 hour or longer, and usually 10 hours or shorter, preferably 5 hours or shorter, more preferably 3 hours or shorter. Set.
- the maximum internal temperature in all reaction stages is 270 ° C. or lower, preferably 260 ° C. or lower, more preferably 250 ° C. or lower. Good.
- the transesterification catalyst that can be used at the time of polymerization can greatly affect the reaction rate and the color tone and thermal stability of a resin obtained by polycondensation.
- the catalyst used is not limited as long as it can satisfy the transparency, hue, heat resistance, thermal stability, and mechanical strength of the produced resin, but it is not limited to Group 1 or Group 2 in the long-period periodic table.
- Group 1 and Group 2 include basic compounds such as metal compounds, basic boron compounds, basic phosphorus compounds, basic ammonium compounds, and amine compounds.
- at least one metal compound selected from the group consisting of a metal of Group 2 of the long-period periodic table and lithium is used.
- Group 1 metal compound for example, the following compounds can be employed, but other Group 1 metal compounds can also be employed.
- the group 2 metal compound for example, the following compounds can be employed, but other group 2 metal compounds can also be employed.
- a basic compound such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, and an amine compound in combination with the above-mentioned Group 1 metal compound and / or Group 2 metal compound.
- a basic compound such as a basic boron compound, a basic phosphorus compound, a basic ammonium compound, and an amine compound in combination with the above-mentioned Group 1 metal compound and / or Group 2 metal compound.
- at least one metal compound selected from the group consisting of a metal of Group 2 of the long-period periodic table and lithium is particularly preferable to use at least one metal compound selected from the group consisting of a metal of Group 2 of the long-period periodic table and lithium.
- the basic phosphorus compound for example, the following compounds can be used, but other basic phosphorus compounds can also be used. Triethylphosphine, tri-n-propylphosphine, triisopropylphosphine, tri-n-butylphosphine, triphenylphosphine, tributylphosphine, or quaternary phosphonium salt.
- the basic ammonium compound for example, the following compounds can be employed, but other basic ammonium compounds can also be employed. Tetramethylammonium hydroxide, tetraethylammonium hydroxide, tetrapropylammonium hydroxide, tetrabutylammonium hydroxide, N, N, N-trimethylethanolamine (choline), trimethylethylammonium hydroxide, trimethylbenzylammonium hydroxide, trimethylphenyl Ammonium hydroxide, triethylmethylammonium hydroxide, triethylbenzylammonium hydroxide, triethylphenylammonium hydroxide, tributylbenzylammonium hydroxide, tributylphenylammonium hydroxide, tetraphenylammonium hydroxide, benzyltriphenylammonium hydroxide, methyltriphenyl Ammoniu Hydroxide, butyl tripheny
- amine compound for example, the following compounds can be used, but amine compounds other than these can also be used.
- the amount of the polymerization catalyst used is usually 0.1 ⁇ mol to 300 ⁇ mol, preferably 0.5 ⁇ mol to 100 ⁇ mol, per 1 mol of all dihydroxy compounds used in the polymerization.
- the polymerization catalyst when using at least one metal compound selected from the group consisting of metals of Group 2 of the long-period periodic table and lithium, particularly when using a magnesium compound and / or a calcium compound, the amount of metal is The polymerization catalyst is usually used in an amount of 0.1 ⁇ mol or more, preferably 0.3 ⁇ mol or more, particularly preferably 0.5 ⁇ mol or more, per 1 mol of the total dihydroxy compound.
- the amount of the polymerization catalyst used is preferably 30 ⁇ mol or less, preferably 20 ⁇ mol or less, particularly preferably 10 ⁇ mol or less.
- Transesterification catalysts such as lead compounds, osmium compounds, zinc compounds and manganese compounds can also be used.
- the amount of these transesterification catalysts used is usually in the range of 1 ⁇ mol to 1 mmol, preferably in the range of 5 ⁇ mol to 800 ⁇ mol, particularly preferably in terms of the amount of metal with respect to 1 mol of all dihydroxy compounds used in the reaction. 10 ⁇ mol to 500 ⁇ mol.
- the amount of the catalyst is too small, the polymerization rate is slowed down. Therefore, in order to obtain a resin having a desired molecular weight, the polymerization temperature must be increased accordingly. For this reason, there is a high possibility that the hue of the resulting resin will deteriorate, and the unreacted raw material may volatilize during the polymerization, causing the molar ratio of the dihydroxy compound and the diester compound to collapse, and the desired molecular weight may not be reached. is there. On the other hand, if the amount of the polymerization catalyst used is too large, undesirable side reactions may occur, which may lead to deterioration of the hue of the resulting resin or coloring of the resin during molding.
- the total amount of these metal compounds in the resin is preferably 2 ⁇ mol or less, preferably 1 ⁇ mol or less, more preferably 0.5 ⁇ mol or less, per 1 mol of the total dihydroxy compound as the metal amount.
- the resin used in the present invention can be polymerized as described above, and then usually cooled and solidified, and pelletized with a rotary cutter or the like.
- the method of pelletization is not limited, but it is extracted from the final stage polymerization reactor in a molten state, cooled and solidified in the form of a strand and pelletized, uniaxially or in a molten state from the final stage polymerization reactor.
- the resin is supplied to a twin-screw extruder, melt-extruded, cooled and solidified into pellets, or extracted from the polymerization reactor in the final stage in a molten state, cooled and solidified in the form of strands, and pelletized once. Examples thereof include a method in which the resin is supplied again to the single-screw or twin-screw extruder, melt-extruded, and then cooled, solidified, and pelletized.
- the molecular weight of the resin thus obtained can be expressed by reduced viscosity. If the reduced viscosity of the resin is too low, the mechanical strength of the molded product may be reduced. Therefore, the reduced viscosity is usually 0.20 dL / g or more, and preferably 0.30 dL / g or more. On the other hand, if the reduced viscosity of the resin is too large, the fluidity during molding decreases, and the productivity and moldability tend to decrease. Therefore, the reduced viscosity is usually 1.20 dL / g or less, preferably 1.00 dL / g or less, and more preferably 0.80 dL / g or less.
- the reduced viscosity is measured by using a Ubbelohde viscometer at a temperature of 20.0 ° C. ⁇ 0.1 ° C., precisely adjusting the polycarbonate concentration to 0.6 g / dL using methylene chloride as a solvent.
- the reduced viscosity has a correlation with the melt viscosity of the resin
- the stirring power of the polymerization reactor, the discharge pressure of the gear pump for transferring the molten resin, and the like can be used as indicators for operation management. That is, when the indicated value of the operating device reaches the target value, the polymerization reaction is stopped by returning the pressure of the reactor to normal pressure or by extracting the resin from the reactor.
- DPC diphenyl carbonate
- the monohydroxy compound derived from carbonic acid diester contained in the resin is preferably 1500 ppm by mass or less. Furthermore, 1000 mass ppm or less is preferable, and 700 mass ppm or less is particularly preferable.
- the content of the monohydroxy compound is preferably as low as possible. However, it is difficult to make the monohydroxy compound remaining in the polymer zero by the melt polymerization method. Requires excessive effort. Usually, the above-mentioned problem can be sufficiently suppressed by reducing the content of the monohydroxy compound to 1 mass ppm.
- the resin is degassed with an extruder as described above, or the pressure at the end of polymerization is 3 kPa.
- the pressure at the end of polymerization is 3 kPa.
- it is effective to set the pressure to 2 kPa or less, more preferably 1 kPa or less.
- the hydroxyl group terminal amount is preferably 50 mol / ton or less, particularly 40 mol / ton or less.
- the terminal amount of the hydroxy group can be quantified by 1 H-NMR or the like.
- the amount of terminal hydroxyl groups can be adjusted by the molar ratio of the total dihydroxy compound and the total diester compound.
- a heat stabilizer can be blended with the resin as necessary in order to prevent a decrease in molecular weight and a deterioration in hue at the time of molding or the like.
- heat stabilizers include conventionally known hindered phenol heat stabilizers and / or phosphorus heat stabilizers.
- hindered phenol compound for example, the following compounds can be employed. 2,6-di-tert-butylphenol, 2,4-di-tert-butylphenol, 2-tert-butyl-4-methoxyphenol, 2-tert-butyl-4,6-dimethylphenol, 2,6-di- tert-butyl-4-methylphenol, 2,6-di-tert-butyl-4-ethylphenol, 2,5-di-tert-butylhydroquinone, n-octadecyl-3- (3 ′, 5′-di- tert-butyl-4′-hydroxyphenyl) propionate, 2-tert-butyl-6- (3′-tert-butyl-5′-methyl-2′-hydroxybenzyl) -4-methylphenyl acrylate, 2,2 ′ -Methylene-bis- (4-methyl-6-tert-butylphenol), 2,2'-methylene-bis- (6-cyclohex
- phosphorus compound for example, the following phosphorous acid, phosphoric acid, phosphonous acid, phosphonic acid, and esters thereof can be adopted, but phosphorus compounds other than these compounds can also be adopted. Is possible. Triphenyl phosphite, tris (nonylphenyl) phosphite, tris (2,4-di-tert-butylphenyl) phosphite, tridecyl phosphite, trioctyl phosphite, trioctadecyl phosphite, didecyl monophenyl phosphite , Dioctyl monophenyl phosphite, diisopropyl monophenyl phosphite, monobutyl diphenyl phosphite, monodecyl diphenyl phosphite, monooctyl diphenyl phosphite, bis (2,6
- Such a thermal stabilizer may be added to the reaction solution during melt polymerization, or may be added to the resin using an extruder and kneaded.
- the heat stabilizer or the like may be added to the extruder to form a film, or the extruder may be used in advance to add the heat stabilizer or the like into the resin.
- a pellet or the like may be used.
- the amount of these heat stabilizers is preferably 0.0001 parts by mass or more, more preferably 0.0005 parts by mass or more, and 0.001 parts by mass or more when the resin used in the present invention is 100 parts by mass. More preferably, it is preferably 1 part by mass or less, more preferably 0.5 part by mass or less, and further preferably 0.2 part by mass or less.
- the resin may be blended with an antioxidant that is usually known for the purpose of preventing oxidation.
- an antioxidant for example, the following compounds can be employed, but compounds other than these can also be employed.
- Pentaerythritol tetrakis (3-mercaptopropionate), pentaerythritol tetrakis (3-laurylthiopropionate), glycerol-3-stearylthiopropionate, triethylene glycol-bis [3- (3-tert-butyl- 5-methyl-4-hydroxyphenyl) propionate], 1,6-hexanediol-bis [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionate], pentaerythritol-tetrakis [3- ( 3,5-di-tert-butyl-4-hydroxyphenyl) propionate], octadecyl-3- (3,5-di-tert-butyl)
- the said antioxidant may be used individually by 1 type, and may use 2 or more types together.
- the blending amount of these antioxidants is preferably 0.0001 parts by mass or more, and more preferably 0.5 parts by mass or less, when the resin of the present invention is 100 parts by mass.
- ultraviolet absorbers such as ultraviolet absorbers, mold release agents, antistatic agents, lubricants, lubricants, plasticizers, compatibilizers, nucleating agents, flame retardants, Inorganic fillers, impact modifiers, foaming agents, dyes and pigments may be included.
- the resin is an aromatic polycarbonate, aromatic polyester, aliphatic polyester, polyamide, polystyrene, polyolefin, acrylic, amorphous polyolefin, ABS, AS for the purpose of modifying the mechanical properties and solvent resistance of the resin.
- it may be a polymer alloy obtained by kneading with one or more of synthetic resins such as polylactic acid and polybutylene succinate and rubber.
- the additives and modifiers may be added to the resin used in the present invention simultaneously or in any order by a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, or extruder. Although it can manufacture by mixing, it is preferable to knead
- a mixer such as a tumbler, V-type blender, nauter mixer, Banbury mixer, kneading roll, or extruder.
- the resin obtained as described above has low birefringence, excellent heat resistance and moldability, less coloring, and high transparency, it is used for optical films, optical disks, optical prisms, pickup lenses, and the like. In particular, it is preferably used as a retardation film.
- Examples of a method for forming an unstretched film using the resin include a casting method in which the resin is dissolved in a solvent and cast, and then the solvent is removed, or the resin is melted without using a solvent to form a film.
- the melt film forming method can be employed. Specific examples of the melt film forming method include a melt extrusion method using a T die, a calender molding method, a heat press method, a coextrusion method, a comelting method, a multilayer extrusion method, and an inflation molding method.
- the method for forming an unstretched film is not particularly limited. However, the casting method may cause a problem due to the residual solvent. Therefore, a T-die is preferably used because of the melt film-forming method, particularly ease of subsequent stretching treatment. The melt extrusion method used is preferred.
- the molding temperature is preferably 270 ° C. or less, more preferably 265 ° C. or less, and particularly preferably 260 ° C. or less.
- the molding temperature is too high, defects due to generation of foreign matters and bubbles in the obtained film may increase or the film may be colored.
- the molding temperature is too low, the melt viscosity of the resin becomes too high, making it difficult to mold the original film, and it may be difficult to produce an unstretched film with a uniform thickness.
- the lower limit is usually 200 ° C. or higher, preferably 210 ° C. or higher, more preferably 220 ° C. or higher.
- the molding temperature of the unstretched film is a temperature at the time of molding in the melt film-forming method, and is usually a value obtained by measuring the temperature at the die outlet for extruding the molten resin.
- a defect such as light leakage when used as a polarizing plate.
- a method in which a polymer filter is attached after the extruder, the resin is filtered, and then extruded from a die to form a film is preferable. At that time, it is necessary to connect the extruder, polymer filter, and die with piping and transfer the molten resin, but in order to suppress thermal deterioration in the piping as much as possible, arrange each facility so that the residence time is minimized. This is very important. Further, the steps of conveying and winding the film after extrusion are performed in a clean room, and the best care is required so that no foreign matter adheres to the film.
- the thickness of the unstretched film is determined according to the design of the film thickness of the retardation film after stretching and stretching conditions such as the stretching ratio. Therefore, it is usually 30 ⁇ m or more, preferably 40 ⁇ m or more, more preferably 50 ⁇ m or more, and usually 200 ⁇ m or less, preferably 160 ⁇ m or less, more preferably 120 ⁇ m or less.
- the thickness of the portion used as the retardation film is preferably set thickness ⁇ 3 ⁇ m or less, and set thickness ⁇ 2 ⁇ m or less. It is more preferable that the thickness is set to be ⁇ 1 ⁇ m or less.
- the length in the longitudinal direction of the unstretched film is preferably 500 m or more, more preferably 1000 m or more, and particularly preferably 1500 m or more. From the viewpoint of productivity and quality, when producing the retardation film of the present invention, it is preferable to continuously stretch, but usually it is necessary to adjust the conditions to match the predetermined retardation at the start of stretching. If the length of the film is too short, the amount of product that can be obtained after adjusting the conditions is reduced.
- the term “long” means that the dimension in the longitudinal direction is sufficiently larger than the width direction of the film, and is substantially capable of being coiled by being wound in the longitudinal direction. means. More specifically, it means that the dimension in the longitudinal direction of the film is 10 times or more larger than the dimension in the width direction.
- a retardation film can be obtained by stretching and orienting the unstretched film.
- the stretching method a known method such as longitudinal uniaxial stretching, lateral uniaxial stretching using a tenter or the like, or simultaneous biaxial stretching and sequential biaxial stretching in combination thereof can be used. Stretching may be performed batchwise, but it is preferable in terms of productivity to be performed continuously. Further, a continuous retardation film with less variation in retardation within the film surface can be obtained compared to a batch system.
- the stretching temperature is in the range of (Tg ⁇ 20 ° C.) to (Tg + 30 ° C.), preferably (Tg ⁇ 10 ° C.) to (Tg + 20 ° C.) with respect to the glass transition temperature (Tg) of the resin used as a raw material. Preferably, it is within the range of (Tg ⁇ 5 ° C.) to (Tg + 15 ° C.).
- the draw ratio is determined by the target retardation value, it is 1.2 times to 4 times, more preferably 1.5 times to 3.5 times, and further preferably 2 times to 3 times in the vertical and horizontal directions. . When the draw ratio is too small, the effective range in which the desired degree of orientation and orientation angle can be obtained becomes narrow. On the other hand, if the stretch ratio is too large, the film may be broken or wrinkles may occur during stretching.
- heat setting treatment may be performed by a heating furnace, or the relaxation step may be performed by controlling the width of the tenter or adjusting the roll peripheral speed.
- the temperature of the heat setting treatment is 60 ° C. to (Tg) ° C., preferably 70 ° C. to (Tg ⁇ 5) ° C. with respect to the glass transition temperature (Tg) of the resin used for the unstretched film. If the heat treatment temperature is too high, the orientation of the molecules obtained by stretching is disturbed, and there is a possibility that the desired retardation will be greatly reduced.
- a relaxation step is provided, the stress generated in the stretched film can be removed by shrinking to 95% to 100% with respect to the width of the film widened by stretching.
- the treatment temperature applied to the film at this time is the same as the heat setting treatment temperature.
- the retardation film of the present invention can be produced by appropriately selecting and adjusting the processing conditions in such a stretching process.
- the retardation film is laminated and bonded to a known polarizing film and cut into a desired dimension to form a circularly polarizing plate.
- Such circularly polarizing plates are used, for example, for viewing angle compensation of various displays (liquid crystal display devices, organic EL display devices, plasma display devices, FED field emission display devices, SED surface field display devices), antireflection of external light, color It can be used for compensation, conversion of linearly polarized light into circularly polarized light, and the like.
- a clear black display is possible and the quality reliability is excellent. Furthermore, it has the performance that can cope with future thinning of equipment.
- polarizing film a polarizing film having an absorption axis in either the width direction or the longitudinal direction can be employed.
- dichroic substances such as iodine and dichroic dyes on hydrophilic polymer films such as polyvinyl alcohol films, partially formalized polyvinyl alcohol films, ethylene / vinyl acetate copolymer partially saponified films, etc.
- polyene-based oriented films such as polyvinyl alcohol dehydrated products and polyvinyl chloride dehydrochlorinated products.
- a long polarizing film obtained by adsorbing a dichroic substance such as iodine to a polyvinyl alcohol film and uniaxially stretching is particularly preferable because of its high polarization dichroic ratio.
- the thickness of these long polarizing films is not particularly limited, but is generally about 1 to 80 ⁇ m.
- a polarizing film uniaxially stretched by adsorbing iodine to a polyvinyl alcohol film can be produced, for example, by dyeing polyvinyl alcohol by immersing it in an aqueous solution of iodine and stretching it 3 to 7 times the original length.
- the aqueous solution may contain boric acid, zinc sulfate, zinc chloride or the like as necessary.
- polyvinyl alcohol can also be immersed in aqueous solutions, such as potassium iodide.
- the polyvinyl alcohol film may be immersed in water and washed before dyeing. By washing the polyvinyl alcohol film with water, the surface of the polyvinyl alcohol film and the anti-blocking agent can be washed. Furthermore, since the polyvinyl alcohol film swells, it also has an effect of preventing unevenness such as stained spots. Stretching may be performed after dyeing with iodine, or may be performed while dyeing, or may be performed with dyeing after iodine. The film can be stretched in an aqueous solution of boric acid or potassium iodide or in a water bath.
- the angle formed by the slow axis of the retardation film and the width direction of the polarizing film is preferably 38 ° or more and 52 ° or less, and preferably 40 ° or more and 50 ° or less. More preferably, it is 42 ° or more and 48 ° or less.
- the external light reflectance described later increases or the reflected light is colored, so that the display quality of the image may be deteriorated.
- the retardation film and the polarizing film may be laminated via an adhesive.
- an adhesive a known adhesive can be used as long as the optical properties of the laminated film are not impaired.
- the circularly polarizing plate has sufficient optical characteristics and is configured to be suitably used for equipment that requires precision, thinness, and homogeneity. Therefore, the said circularly-polarizing plate can be used suitably for the liquid crystal panel used for a liquid crystal display, the organic electroluminescent panel used for an organic electroluminescent display, etc., for example.
- the organic EL panel includes a metal layer that easily reflects external light, problems such as external light reflection and background reflection tend to occur. In order to prevent such reflection of external light, it is effective to provide the circularly polarizing plate on the light emitting surface.
- reflectance and reflection hue can be employed as an index of characteristics for preventing external light reflection and the like in the organic EL panel.
- the reflectivity affects the brightness of the display color when displaying black, that is, with the organic EL element turned off. The lower the reflectivity, the clearer the black color is obtained and the visibility of the display is improved.
- the reflectance is excessively high, even when trying to display black, the brightness of the display color may increase due to the reflection of external light, so that the bright room contrast may be lowered and the visibility may be lowered.
- the reflected hue affects the color tone of the display color when black is displayed, and a clearer black color is obtained as the color tone is closer to an achromatic color. If the reflected color tone is tinged, black may not be displayed.
- fluorene-based monomer Quality evaluation of monomers containing a fluorene ring (hereinafter referred to as fluorene-based monomer) and characteristics evaluation of the resin and the transparent film were performed by the following methods.
- the characteristic evaluation method is not limited to the following method and can be appropriately selected by those skilled in the art.
- Thermal decomposition temperature of fluorene monomer The glass transition temperature of the fluorene monomer was measured using a differential thermogravimetric simultaneous analyzer TG-DTA6300 manufactured by SII Nanotechnology. About 4 mg of fluorene monomer was sealed in an aluminum pan manufactured by the same company, and the temperature was raised from room temperature (20 to 30 ° C.) to 600 ° C. at a heating rate of 10 ° C./min under a nitrogen stream of 200 mL / min. From the obtained TG data (thermogravimetric data), the temperature at which the sample weight decreased by 5% by weight was defined as the 5% by weight weight decrease temperature.
- the initial weight is defined as the weight at the time when the weight does not change after the solvent weight estimated from 1 H-NMR decreases from the weight at the start of measurement.
- the temperature decreased by 5% by weight was defined as a 5% weight decrease temperature.
- TG data thermogravimetric data
- UV-Vis ultraviolet-visible region
- UV-Vis ultraviolet-visible region
- the absorption maximum wavelength in the ultraviolet-visible region (UV-Vis: 280 to 800 nm) of the fluorene monomer is the ultraviolet-visible absorption manufactured by Shimadzu Corporation. Measurement was performed using a spectrophotometer UV-1650PC. The measurement solution was precisely prepared using tetrahydrofuran as a solvent and a concentration of 10 ⁇ M as a fluorene ring. A 1 cm square quartz cell was used as the measurement cell, and the measurement was performed in an environment at a temperature of 23 ⁇ 5 ° C. The absorption spectrum of the measurement solution was measured in the range of 280 to 800 nm, and the maximum absorption value was defined as the absorption maximum wavelength ( ⁇ max ).
- Glass transition temperature (Tg) of resin The glass transition temperature of the resin was measured using a differential scanning calorimeter DSC 6220 manufactured by SII Nanotechnology. About 10 mg of resin was sealed in an aluminum pan manufactured by the same company, and the temperature was raised from 30 ° C. to 250 ° C. at a temperature rising rate of 20 ° C./min under a nitrogen stream of 50 mL / min. After maintaining the temperature for 3 minutes, it was cooled to 30 ° C. at a rate of 20 ° C./min. The temperature was maintained at 30 ° C. for 3 minutes, and the temperature was increased again to 200 ° C. at a rate of 20 ° C./min.
- the thickness accuracy is calculated by the following equation. That is, thickness accuracy measures the thickness of each position of a film, and shows the ratio with respect to the average value of the difference of the maximum value or minimum value of a fluctuation
- variation range, and an average value. Thickness accuracy [%]
- Photoelastic coefficient A sample was prepared by cutting an unstretched film into a rectangular shape having a width of 20 mm and a length of 100 mm. This sample was measured with an ellipsometer M-150 manufactured by JASCO Corporation with light having a wavelength of 550 nm to obtain a photoelastic coefficient.
- Elastic modulus A rectangular test piece having a width of 5 mm and a length of 50 mm was cut out from the film obtained by the above-described method, and the storage elastic modulus (E ′) and the loss elastic modulus (E ′′) were measured.
- a rheometer RSA-III manufactured by TA Instruments was used, and the temperature was 0 in a tensile mode under conditions of a distance between chucks of 20 mm, a heating rate of 3 ° C./min, a frequency of 1 Hz, and a strain of 0.1%. The temperature was raised from 0 ° C. to the glass transition temperature of each sample or more, and measurement was performed until the sample was cut and stopped.
- the storage elastic modulus at 30 ° C. was used as the elastic modulus in the present invention.
- test piece bends into two pieces (or more than three pieces) at the bent part until the joint surfaces are completely in close contact with each other, it is “cracked”. When it was bent without breaking, it was judged as “no crack”. The same type of film was tested 5 times. Of those, “X: Brittle Fracture” was given 4 times or more, “X: Brittle Fracture”, and “No Crack” 3 times or less. : No brittle fracture ”.
- Whether the refractive index anisotropy is positive or negative can be determined from the relationship between the orientation angle (slow axis) and the stretching direction. In this phase difference measurement, when the slow axis coincides with the stretching direction, the refractive index anisotropy of the resin is positive.
- Retardation change rate A sample in which a retardation film with an adhesive was bonded to glass was prepared, and the retardation was measured by the same method as the measurement of the retardation. The sample after measurement was put into a heating oven at 85 ° C. for 180 hours, then the sample was taken out, the phase difference was measured again, and the change rate of R550 was determined.
- toluene 100 ml was added and cooled to 50 ° C.
- Methanol 250 ml was added thereto, and after cooling to 5 ° C., suction filtration was performed.
- the obtained white solid was dispersed in toluene (100 ml) and heated to reflux for 30 minutes. After cooling to 50 ° C., methanol (200 ml) was added.
- Example 1 Polymerization was carried out using a batch polymerization apparatus comprising two vertical reactors equipped with a stirring blade and a reflux condenser controlled at 100 ° C.
- Bis [9- (2-phenoxycarbonylethyl) fluoren-9-yl] methane (Compound 3) 36.94 parts by mass (0.058 mol), ISB 64.02 parts by mass (0.438 mol), DPC 82.43 parts by mass Parts (0.385 mol) and calcium acetate monohydrate 3.86 ⁇ 10 ⁇ 4 parts by mass (2.19 ⁇ 10 ⁇ 6 mol) were charged as a catalyst.
- a long unstretched film having a length of 3 m, a width of 200 mm, and a thickness of 77 ⁇ m was prepared using the above-described melt extrusion method.
- the long unstretched film was subjected to longitudinal uniaxial stretching at a stretching temperature of 161 ° C. and a stretching ratio of 2.52 to prepare a retardation film.
- the circularly-polarizing plate was produced using the obtained retardation film, and it mounted in the organic electroluminescent panel. Table 1 shows the results of various evaluations.
- the retardation film of this example showed reverse wavelength dispersion and was excellent in all properties such as orientation, photoelastic coefficient, reliability, heat resistance and toughness.
- the reflectance of outside light was kept low, and the hue was also beautiful black.
- the retardation film of this example has a larger birefringence value than that of Example 1, it can be understood that the degree of orientation of the polymer is high. Moreover, the characteristic which was excellent also in the mounting evaluation of the organic electroluminescent panel was shown.
- the retardation film of this example showed a lower photoelastic coefficient than that of Example 1. Moreover, the characteristic which was excellent also in the mounting evaluation of the organic electroluminescent panel was shown.
- the retardation film of this example was able to increase the birefringence value of Example 1 and to improve the degree of orientation of the polymer by weakening the reverse wavelength dispersion as compared with Example 2. .
- the hue of the panel is farther from the neutral point than in Example 2, but when the film thickness is important depending on the application, the retardation film of Example 4 is preferably used. it can.
- the retardation film of this example has a lower orientation than the examples, and it was necessary to make the film thicker in order to obtain a predetermined retardation. Moreover, it can be understood that the retardation film of this example has a large retardation change rate and low reliability. Moreover, in the mounting evaluation of the organic EL panel, the result was worse than that of the example.
- the retardation film of this example tried to increase the birefringence by weakening the reverse wavelength dispersion as compared with Comparative Example 1. However, the film could not be thinned to the level of the example. Moreover, in the mounting evaluation of the organic EL panel, a bad result was obtained as compared with the example.
- the retardation film of this example has a small birefringence and a low degree of polymer orientation compared to the examples. Therefore, the film thickness of the film could not be reduced to the level of the example. Moreover, it can be understood that the toughness is inferior to the examples. Moreover, in the mounting evaluation of the organic EL panel, a bad result was obtained as compared with the example.
- the retardation film of this example was inferior in orientation and reliability as compared with the examples. Moreover, it can be understood that the toughness is inferior to the examples.
- the retardation film of this example could not be reduced to the film thickness as in the example by laminating two retardation plates. Also, the panel mounting evaluation was worse than that of the example.
- the retardation film of this example did not show reverse wavelength dispersion. Moreover, in the mounting evaluation of the organic EL panel, a bad result was obtained as compared with the example.
- FIG. 1 is a graph plotting birefringence ( ⁇ n) and chromatic dispersion (R450 / R550) obtained in Examples and Comparative Examples.
- the vertical axis in FIG. 1 is birefringence ( ⁇ n), and the horizontal axis is chromatic dispersion (R450 / R550).
- the straight lines (symbol I and II) shown in FIG. 1 are straight lines represented by the following formula (I ′) and the following formula (II ′), respectively.
- plot points corresponding to Examples 1 to 4 are indicated by symbols E1 to E4, respectively, and plot points corresponding to Comparative Examples 1 to 4 are respectively indicated by symbols C1 to C4.
- ⁇ n 0.0140 ⁇ (R450 / R550) ⁇ 0.0082 (I ′)
- ⁇ n 0.0140 ⁇ (R450 / R550) ⁇ 0.0080 (II ′)
- Examples 1 to 4 satisfy the relationship in which birefringence and wavelength dispersion are expressed by the above formula (I).
- Table 1 “ ⁇ ” in “determination of formula (I)” satisfies the relationship represented by formula (I), and “x” does not satisfy the relationship represented by formula (I). Represents that.
Abstract
Description
即ち、本発明は以下を要旨とする。
波長450nmにおける位相差(R450)と、波長550nmにおける位相差(R550)との比である波長分散(R450/R550)の値が0.75以上、0.92以下であり、
波長550nmにおける複屈折(Δn)及び前記波長分散(R450/R550)が下記数式(I)の関係を満足し、かつ
光弾性係数が25×10-12Pa-1以下である、位相差フィルム。
Δn ≧ 0.0140×(R450/R550)-0.0082 (I)
[3]前記熱可塑性樹脂のガラス転移温度が120℃以上、160℃以下である、前記[1]または[2]に記載の位相差フィルム。
[4]前記熱可塑性樹脂の弾性率が1GPa以上、2.5GPa以下である、前記[1]~[3]のいずれか1に記載の位相差フィルム。
[7]前記熱可塑性樹脂における、芳香族基を含む構造単位(但し、前記一般式(1)で表される構造単位及び前記一般式(2)で表される構造単位を除く。)の含有量が5質量%以下である、前記[5]または[6]に記載の位相差フィルム。
[8]前記熱可塑性樹脂は、下記一般式(3)で表される構造単位を含有している、前記[1]~[6]のいずれか1に記載の位相差フィルム。
[10]前記[9]に記載の円偏光板を備えた画像表示装置。
[11]前記[9]に記載の円偏光板を備えた有機ELパネル。
なお、本明細書において“重量%”と“質量%”、“重量部”と“質量部”、“重量ppm”と“質量ppm”とは、それぞれ同義である。
(A)波長450nmにおける位相差(R450)と、波長550nmにおける位相差(R550)との比である波長分散(R450/R550)の値が0.75以上、0.92以下であること。
(B)波長550nmにおける複屈折(Δn)及び前記波長分散(R450/R550)が下記数式(I)の関係を満足すること。
(C)光弾性係数が25×10-12Pa-1以下であること。
Δn ≧ 0.0140×(R450/R550)-0.0082 (I)
本発明の位相差フィルムは、熱可塑性樹脂からなる未延伸フィルムを、後述する延伸方法によって、少なくとも一方向に延伸して得られる延伸フィルムであり、単一層で上記の特性を有するフィルムである。
Δn ≧ 0.0140×(R450/R550)-0.0082 (I)
Δn ≧ 0.0140×(R450/R550)-0.0080 (II)
前記位相差フィルムに用いられる樹脂は、溶融製膜法によってフィルムを成形することができ、延伸加工性にも優れる熱可塑性樹脂である。
位相差変化 = 複屈折変化×フィルム厚み
= 光弾性係数×応力×フィルム厚み
= 光弾性係数×弾性率×歪み×フィルム厚み
本発明の位相差フィルムに用いられる熱可塑性樹脂は、カーボネート結合及びエステル結合のうち少なくとも1種の結合基と、後述する2価のオリゴフルオレンに由来する特定の構造単位を含有していることが好ましい。即ち、前記樹脂としては、前記特定の構造単位を含有するポリカーボネート、ポリエステルまたはポリエステルカーボネートを好適に用いることができる。かかる構成を有する樹脂は、耐熱性、機械物性、溶融加工性等に優れており、また、複数のモノマーを共重合することで、前述した位相差フィルムの光学特性を所望の範囲に制御しやすいという利点を有する。尚、本発明の位相差フィルムは、後述するように、前記樹脂の他に、必要に応じてその他の合成樹脂や添加剤等を含んでいてもよい。
・従来、ポリマーの主鎖に組み込まれていたフェニル環等の芳香族成分がポリマーの主鎖に組み込まれなくなるため、光弾性係数を低減できる。
・主鎖に組み込まれた前記芳香族成分が、短波長ほど複屈折が大きくなる正の波長分散性を示すため、従来は、側鎖のフルオレン環に由来する逆波長分散性が相殺され、樹脂全体としての逆波長分散性が低下してしまっていた。これに対し、芳香族成分が主鎖に組み込まれなくなることにより、逆波長分散性をより強く発現させることができる。
・一分子中にフルオレン環を二つ導入することで、高い耐熱性を付与できる。
・主鎖が柔軟なアルキレン鎖で構成されるため、樹脂に柔軟性や溶融加工性を付与することができる。
一方、光学特性を確保しつつ、耐熱性や機械特性等とのバランスをとるために、ポリマーの主鎖や側鎖に芳香族成分を組み込むことが有効な場合もある。この場合には、例えば、芳香族成分を含有する前記その他の構造単位により、ポリマーに芳香族成分を導入することができる。
諸特性のバランスをとる観点から、前記樹脂における、芳香族基を含む構造単位(但し、前記一般式(1)で表される構造単位及び前記一般式(2)で表される構造単位を除く。)の含有量が5質量%以下であることが好ましく、3質量%以下であることがより好ましい。
本発明に用いられるポリカーボネート、ポリエステル、ポリエステルカーボネートは、一般に用いられる重合方法で製造することができる。即ち、前記樹脂は、例えば、ホスゲンやカルボン酸ハロゲン化物を用いた溶液重合法又は界面重合法や、溶媒を用いずに反応を行う溶融重合法を用いて製造することができる。これらの製造方法のうち、溶媒や毒性の高い化合物を使用しないことから環境負荷を低減することができ、また、生産性にも優れる溶融重合法によって製造することが好ましい。
前記樹脂を用いて未延伸フィルムを製膜する方法としては、前記樹脂を溶媒に溶解させてキャストした後、溶媒を除去する流延法や、溶媒を用いずに前記樹脂を溶融させて製膜する溶融製膜法を採用することができる。溶融製膜法としては、具体的にはTダイを用いた溶融押出法、カレンダー成形法、熱プレス法、共押出法、共溶融法、多層押出、インフレーション成形法等がある。未延伸フィルムの製膜方法は特に限定されないが、流延法では残存溶媒による問題が生じるおそれがあるため、好ましくは溶融製膜法、中でも後の延伸処理のし易さから、Tダイを用いた溶融押出法が好ましい。
前記未延伸フィルムを延伸配向させることにより、位相差フィルムを得ることができる。延伸方法としては縦一軸延伸、テンター等を用いる横一軸延伸、あるいはそれらを組み合わせた同時二軸延伸、逐次二軸延伸等、公知の方法を用いることができる。延伸はバッチ式で行ってもよいが、連続で行うことが生産性において好ましい。さらにバッチ式に比べて、連続の方がフィルム面内の位相差のばらつきの少ない位相差フィルムが得られる。
歪み速度(%/分)={延伸速度(mm/分)/原反フィルムの長さ(mm)}×100
前記位相差フィルムは、公知の偏光フィルムと積層貼合し、所望の寸法に切断することにより円偏光板となる。かかる円偏光板は、例えば、各種ディスプレイ(液晶表示装置、有機EL表示装置、プラズマ表示装置、FED電界放出表示装置、SED表面電界表示装置)の視野角補償用、外光の反射防止用、色補償用、直線偏光の円偏光への変換用等に用いることができる。特に有機ELディスプレイの外光反射防止用の円偏光板に用いると、きれいな黒表示が可能となり、品質の信頼性にも優れている。さらに今後の機器の薄型化にも対応し得る性能を有している。
前記偏光フィルムとしては、幅方向または長手方向のいずれかに吸収軸を有する偏光フィルムを採用することができる。具体的には、ポリビニルアルコール系フィルム、部分ホルマール化ポリビニルアルコール系フィルム、エチレン・酢酸ビニル共重合体系部分ケン化フィルム等の親水性高分子フィルムに、ヨウ素や二色性染料等の二色性物質を吸着させて一軸延伸したフィルム、ポリビニルアルコールの脱水処理物やポリ塩化ビニルの脱塩酸処理物等ポリエン系配向フィルム等が挙げられる。これらの中でも、ポリビニルアルコール系フィルムにヨウ素などの二色性物質を吸着させて一軸延伸した長尺偏光フィルムが、偏光二色比が高く特に好ましい。これら長尺偏光フィルムの厚さは特に制限されないが、一般的に1~80μm程度である。
(1)フルオレン系モノマーの熱分解温度
フルオレン系モノマーのガラス転移温度は、エスアイアイ・ナノテクノロジー社製示差熱重量同時分析装置TG-DTA6300を用いて測定した。約4mgのフルオレン系モノマーを同社製アルミパンに入れて密封し、200mL/分の窒素気流下、昇温速度10℃/分で室温(20~30℃)から600℃まで昇温した。得られたTGデータ(熱重量データ)より、試料重量が5重量%減少した温度を5重量%重量減少温度とした。溶媒を含有しているモノマーに関しては、測定開始時の重量から1H-NMRより見積もられた溶媒重量が減少した後、重量変化がなくなった時点での重量を初期重量とし、その初期重量が5重量%減少した温度を5重量%重量減少温度とした。また、得られたTGデータ(熱重量データ)より、重量の減少が認められず、かつ、急峻な吸熱ピークが観測された、そのピークトップを試料の融点とした。
フルオレン系モノマーの紫外可視領域(UV-Vis:280~800nm)における吸収極大波長は、(株)島津製作所製紫外可視吸収分光光度計UV-1650PCを用いて測定した。測定溶液は、溶媒としてテトラヒドロフランを用い、フルオレン環として濃度が10μMとなるように、精密に調製した。測定セルには1cm角の石英セルを用い温度23±5℃の環境で測定した。測定溶液の吸収スペクトルを280~800nmの範囲で測定し、吸収の極大値を吸収極大波長(λmax)とした。
前記樹脂を塩化メチレンに溶解させ、0.6g/dLの濃度の樹脂溶液を調製した。森友理化工業社製ウベローデ型粘度管を用いて、温度20.0℃±0.1℃で測定を行い、溶媒の通過時間t0及び溶液の通過時間tを測定した。得られたt0及びtの値を用いて次式(i)により相対粘度ηrelを求め、更に、得られた相対粘度ηrelを用いて次式(ii)により比粘度ηspを求めた。
ηrel=t/t0 ・・・(i)
ηsp=(η-η0)/η0=ηrel-1 ・・・(ii)
その後、得られた比粘度ηspを濃度c(g/dL)で割って、還元粘度ηsp/cを求めた。この値が高いほど分子量が大きい。
ペレット状の樹脂を90℃で5時間以上、真空乾燥させた。乾燥したペレットを用いて、東洋精機(株)製キャピラリーターで測定を行った。測定温度は240℃とし、剪断速度9.12~1824sec-1間で溶融粘度を測定し、91.2sec-1における溶融粘度の値を用いた。なお、オリフィスには、ダイス径が1mmφ、ダイス長が10mmのものを用いた。
前記樹脂のガラス転移温度は、エスアイアイ・ナノテクノロジー社製示差走査熱量計DSC6220を用いて測定した。約10mgの樹脂を同社製アルミパンに入れて密封し、50mL/分の窒素気流下、昇温速度20℃/分で30℃から250℃まで昇温した。3分間温度を保持した後、30℃まで20℃/分の速度で冷却した。30℃で3分保持し、再び200℃まで20℃/分の速度で昇温した。2回目の昇温で得られたDSCデータより、低温側のベースラインを高温側に延長した直線と、ガラス転移の階段状変化部分の曲線の勾配が最大になるような点で引いた接線との交点の温度である、補外ガラス転移開始温度を求め、それをガラス転移温度とした。
(6)フィルムの成形
以下のようにして、溶融押出法によって長尺の未延伸フィルムを作製した。90℃で5時間以上、真空乾燥をした樹脂のペレットを、いすず化工機(株)製単軸押出機(スクリュー径25mm、シリンダー設定温度:220℃~250℃)を用い、Tダイ(幅200mm、設定温度:200~240℃)から押し出した。押し出したフィルムを、チルロール(設定温度:120~150℃)により冷却しつつ巻取機でロール状にし、長尺未延伸フィルムを作製した。Tダイのリップ幅やチルロールの温度、Tダイとチルロールとの距離等を調整することにより、5%以下のフィルムの厚み精度を実現することができた。なお、本明細書において、厚み精度は下記式で計算される。即ち、厚み精度は、フィルムの各位置の厚みを計測し、変動範囲の最大値又は最小値と平均値との差の、平均値に対する比率を示す。
厚み精度[%]=|厚みの最大値又は最小値-平均値|/平均値×100
未延伸フィルムから、長さ40mm、幅8mmの長方形の試験片を切り出して測定試料とした。波長656nm(C線)、589nm(D線)、486nm(F線)の干渉フィルターを用いて、(株)アタゴ製多波長アッベ屈折率計DR-M4/1550により各波長の屈折率nC、nD、nFを測定した。測定は界面液としてモノブロモナフタレンを用い、20℃で行った。アッベ数νdは次の式で計算した。
νd=(1-nD)/(nC-nF)
アッベ数が大きいほど、屈折率の波長依存性が小さいことを表す。
前述の溶融押出法により、膜厚約100μmの未延伸フィルムを作製し、日本電色工業(株)製濁度計COH400を用いて全光線透過率を測定した。
未延伸フィルムを幅20mm、長さ100mmの長方形状に切り出して試料を作製した。この試料を日本分光(株)製エリプソメータM-150により波長550nmの光で測定し、光弾性係数を得た。
前述の方法により、厚さ100~300μmの未延伸フィルムを作製し、縦100mm、横100mmの正方形に切り出して試料を作製した。この試料を用いてJIS K 7209(1984年版)に記載の「プラスティックの吸水率及び沸騰吸水率試験方法」に準拠して吸水率を測定した。
前述の方法で取得したフィルムから幅5mm、長さ50mmの長方形の試験片を切り出し、貯蔵弾性率(E’)と損失弾性率(E’’)を測定した。測定には、TA Instruments社製レオメーターRSA-IIIを用いて、引っ張りモードにて、チャック間距離20mm、昇温速度3℃/分、周波数1Hz、歪み0.1%の条件で、温度は0℃から各サンプルのガラス転移温度以上まで昇温し、サンプルが切れて停止するまで測定を行った。本発明における弾性率には、30℃における貯蔵弾性率を用いた。
前述の方法により、厚み100~200μmの未延伸フィルムを作製し、このフィルムから長さ40mm、幅10mmの長方形の試験片を作製した。万力の左右の接合面の間隔を40mmに開き、試験片の両端を接合面内に固定した。次に左右の接合面の間隔を2mm/秒以下の速度で狭めていき、フィルムが万力の接合面の外にはみ出さないようにしながら、略U字状に折れ曲がったフィルム全体を該接合面内で圧縮していった。接合面間が完全に密着する迄に試験片が折れ曲がり部で2片(又は3片以上の破片)に割れた場合を「割れあり」、接合面間が完全に密着してもなお試験片が割れずに折り曲げられた場合「割れなし」とした。同一の種類のフィルムについて5回繰り返して試験を実施し、そのうち4回以上「割れあり」となったものを「×:脆性破壊する」、3回以下「割れあり」となったものを「○:脆性破壊しない」とした。
(13)フィルムの延伸
溶融押出法によって作製した長尺の未延伸フィルムから幅120mm、長さ150mmの長方形状のフィルム片を切り出した。Bruckner社製テンター延伸装置KAROIVを用いて、300%/分の延伸速度で、延伸方向に対して直角方向は保持せずに前記フィルム片の一軸延伸を行い、位相差フィルムを得た。なお、延伸温度や倍率等の条件は後述の各実施例、及び比較例で記述する。
位相差フィルムから、幅4cm、長さ4cmのサンプルを切り出した。Axometrics社製AxoScanを用いて、23℃の室内で、前記サンプルの波長450nmの位相差R450、550nmの位相差R550、及び波長650nmの位相差R650を測定した。そして、得られた位相差の値を用い、位相差R450と位相差R550の比である波長分散(R450/R550)の値及び位相差R650と位相差R550の比(R650/R550)を計算した。屈折率異方性の正負は、配向角(遅相軸)と延伸方向との関係から判定することができる。この位相差の測定において、遅相軸が延伸方向と一致した場合、この樹脂の屈折率異方性は正である。
尾崎製作所(株)製接触式厚み測定機PEACOCKを使用して、位相差フィルムの厚みを測定した。また、前記の位相差測定において得られた550nmの位相差R550と、位相差フィルムの厚みを用い、次の式により複屈折(Δn)を求めた。
複屈折=R550[nm]/(フィルム厚み[mm]×106)
複屈折の値が大きいほど、ポリマーの配向度が高いことを示す。また、複屈折の値が大きいほど、所望の位相差値を得るためのフィルムの厚みを薄くすることができる。
粘着剤付き位相差フィルムをガラスに貼り合わせたサンプルを作製し、前記位相差の測定と同様の方法で位相差を測定した。測定後のサンプルを85℃の加熱オーブンに180時間投入後、サンプルを取り出し、再度位相差を測定し、R550の変化率を求めた。
(17)円偏光板の作製
前記位相差フィルムにアクリル系粘着フィルムを塗工し、粘着剤付き位相差フィルムを作製した。次いで、日東電工(株)製粘着剤付き偏光板MCIG1481DUARC9の吸収軸が、前記粘着剤付き位相差フィルムの延伸軸と45°の角度をなすようにして、これらを貼り合せ、円偏光板を作製した。
LG社製有機ELディスプレイ15EL9500より有機ELパネルを取り出した。この有機ELパネルに貼り付けられている偏光板を剥がし、代わりに前記円偏光板を貼り合わせて被験体である有機ELパネルを作製した。
前述のごとく作製した有機ELパネルを試料とし、コニカミノルタ(株)製分光測色計CM-2600dを用いて反射率と反射色相とを測定した。反射色相は、下記式で表されるu´v´色度図上における無彩色からの距離Δu´v´で示した。尚、下記式におけるu´及びv´は、前述の測定によって得られるu´v´色度図上における色座標の値である。
以下に、樹脂の製造に用いたモノマーの合成方法を説明する。
1H-NMR(400MHz,CDCl3)δ7.83(d,J=7.6Hz,4H),7.56(dd,J1=7.6Hz,J2=0.8Hz,4H),7.41(t,J=7.3Hz,4H),7.29(dt,J1=7.3Hz,J2=1.3Hz,4H),4.42(t,J=7.6Hz,2H),2.24(d,J=7.6Hz,2H).
1H-NMR(400MHz,CDCl3)δ7.03(d,J=7.6Hz,4H),6.97(dt,J1=7.6Hz,J2=1.5Hz,4H),6.82(dt,J1=7.6Hz,J2=1.3Hz,4H),6.77(d,J=7.6Hz,4H),3.88(q,J=7.1Hz,4H),3.12(s,2H),2.23(m,4H),1.13(m,4H),1.02(t,J=7.1Hz,6H).
また、化合物2の5重量%重量減少温度(窒素雰囲気下)は295℃であり、融点は141℃であった。
1H-NMR(400MHz,CDCl3)δ7.23-7.28(m,4H),7.07-7.16(m,6H),7.03(dt,J1=6.9Hz,J2=2.0,4H),6.78-6.90(m,12H),3.20(s,2H),2.37(t,J=8.3Hz,4H),1.40(t,J=8.3Hz,4H).
また、化合物3の5重量%重量減少温度(窒素雰囲気下)は336℃であり、融点は176℃であった。
以下の実施例、及び比較例で用いた化合物の略号等は以下の通りである。
・BHEPF:9,9-ビス[4-(2-ヒドロキシエトキシ)フェニル]-フルオレン(大阪ガスケミカル(株)製)
・BCF:9,9-ビス(4-ヒドロキシ-3-メチルフェニル)-フルオレン(大阪ガスケミカル(株)製)
・DPC:ジフェニルカーボネート(三菱化学(株)製)
・ISB:イソソルビド(ロケットフルーレ社製、商品名:POLYSORB)
・CHDM:1,4-シクロヘキサンジメタノール(シス、トランス混合物、SKケミカル社製)
・SPG:スピログリコール(三菱ガス化学(株)製)
・BPA:2,2-ビス[4-ヒドロキシフェニル]プロパン(三菱化学(株)製)
・PEG:ポリエチレングリコール 数平均分子量:1000(三洋化成(株)製)
撹拌翼および100℃に制御された還流冷却器を具備した縦型反応器2器からなるバッチ重合装置を用いて重合を行った。ビス[9-(2-フェノキシカルボニルエチル)フルオレン-9-イル]メタン(化合物3)36.94質量部(0.058mol)、ISB 64.02質量部(0.438mol)、DPC 82.43質量部(0.385mol)、及び触媒として酢酸カルシウム1水和物3.86×10-4質量部(2.19×10-6mol)を仕込んだ。反応器内を減圧窒素置換した後、熱媒で加温を行い、内温が100℃になった時点で撹拌を開始した。昇温開始40分後に内温を220℃に到達させ、この温度を保持するように制御すると同時に減圧を開始し、220℃に到達してから90分で13.3kPaにした。重合反応とともに副生するフェノール蒸気を100℃の還流冷却器に導き、フェノール蒸気中に若干量含まれるモノマー成分を反応器に戻し、凝縮しないフェノール蒸気は45℃の凝縮器に導いて回収した。第1反応器に窒素を導入して一旦大気圧まで復圧させた後、第1反応器内のオリゴマー化された反応液を第2反応器に移した。次いで、第2反応器内の昇温および減圧を開始して、50分で内温240℃、圧力0.2kPaにした。その後、所定の攪拌動力となるまで重合を進行させた。所定動力に到達した時点で反応器に窒素を導入して復圧し、生成したポリエステルカーボネートを水中に押し出し、ストランドをカッティングしてペレットを得た。
ビス[9-(2-フェノキシカルボニルエチル)フルオレン-9-イル]メタン(化合物3)38.06質量部(0.059mol)、ISB 43.06質量部(0.295mol)、CHDM 20.28質量部(0.141mol)、DPC 81.46質量部(0.380mol)、酢酸カルシウム1水和物3.83×10-4質量部(2.18×10-6mol)を用いたこと、未延伸フィルムの厚みを68μmとしたこと、延伸温度を129℃、延伸倍率を2.4倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
ビス[9-(2-フェノキシカルボニルエチル)フルオレン-9-イル]メタン(化合物3)29.60質量部(0.046mol)、ISB 29.21質量部(0.200mol)、SPG 42.28質量部(0.139mol)、DPC 63.77質量部(0.298mol)、酢酸カルシウム1水和物1.19×10-2質量部(6.78×10-5mol)を用いたこと、未延伸フィルムの厚みを61μmとしたこと、延伸温度を134℃、延伸倍率を3.15倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
ビス[9-(2-フェノキシカルボニルエチル)フルオレン-9-イル]メタン(化合物3)37.43質量部(0.058mol)、ISB 43.31質量部(0.296mol)、CHDM 20.40質量部(0.141mol)、DPC 82.20質量部(0.380mol)、酢酸カルシウム1水和物3.86×10-4質量部(2.19×10-6mol)を用いたこと、未延伸フィルムの厚みを38μmとしたこと、延伸温度を130℃、延伸倍率を2.4倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
BHEPF 68.07質量部(0.155mol)、ISB 22.84質量部(0.156mol)、PEG 0.97質量部(9.75×10-4mol)、DPC 67.60質量部(0.316mol)、酢酸マグネシウム4水和物5.36×10-4質量部(2.50×10-6mol)を用いたこと、未延伸フィルムの厚みを101μmとしたこと、延伸温度を149℃、延伸倍率を2.4倍にしたこと以外は実施例1と同様にして長尺位相差フィルムを作製した。各種評価の結果を表1に示す。
BHEPF 63.72質量部(0.145mol)、ISB 26.74質量部(0.183mol)、PEG 0.97質量部(9.75×10-4mol)、DPC 71.24質量部(0.333mol)、酢酸マグネシウム4水和物7.06×10-4質量部(3.29×10-6mol)を用いたこと、未延伸フィルムの厚みを80μmとしたこと、延伸温度を149℃、延伸倍率を2.2倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
BCF 32.20質量部(0.085mol)、SPG 60.43質量部(0.199mol)、DPC 64.40質量部(0.301mol)、酢酸カルシウム1水和物5.00×10-3質量部(2.84×10-5mol)を用い、最終重合温度を260℃としたこと、未延伸フィルムの厚みを100μmとしたこと、延伸温度を145℃、延伸倍率を2倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
BHEPF 80.49質量部(0.184mol)、BPA 13.23質量部(0.058mol)、DPC 53.29質量部(0.249mol)、酢酸カルシウム1水和物2.13×10-3質量部(1.21×10-5mol)を用い、最終重合温度を260℃としたこと、未延伸フィルムの厚みを102μmとしたこと、延伸温度を153℃、延伸倍率を2倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
延伸温度141.5℃、延伸倍率1.5倍の条件で(株)日本ゼオン社製ZF14-040(未延伸膜厚:40μm、Tg:134℃)に延伸を行い、位相差140nmの位相差フィルムを得た。
また、延伸温度140.5℃、延伸倍率2.2倍の条件で(株)日本ゼオン社製ZF14-050(未延伸膜厚:50μm、Tg:134℃)に延伸を行い、位相差270nmの位相差フィルムを得た。
これら2つの位相差フィルムにアクリル製粘着剤を塗布し、粘着剤付き位相差フィルムを得た。次に円偏光板を作製する際、偏光板の吸収軸と、270nmの位相差フィルムの延伸方向とのなす角度が15°となるようにして貼り合せ、楕円偏光板を作製した。次いで、その楕円偏光板の位相差フィルム側に、偏光板の吸収軸と、140nmの位相差フィルムを延伸方向とのなす角度が75°となるようにさらに貼り合せ、円偏光板を作製した。有機ELパネルの作製、反射率および反射色相の測定は実施例1と同様に行った。
ISB 84.90質量部(0.581mol)、DPC 125.69質量部(0.587mol)、酢酸カルシウム1水和物8.19×10-5質量部(4.65×10-7mol)を用いたこと、未延伸フィルムの厚みを17μmとしたこと、延伸温度を166℃、延伸倍率を2倍にしたこと以外は実施例1と同様にして位相差フィルムを作製した。各種評価の結果を表1に示す。
Δn = 0.0140×(R450/R550)-0.0082 (I’)
Δn = 0.0140×(R450/R550)-0.0080 (II’)
Claims (11)
- 熱可塑性樹脂を含有し、単一層からなる位相差フィルムであって、
波長450nmにおける位相差(R450)と、波長550nmにおける位相差(R550)との比である波長分散(R450/R550)の値が0.75以上、0.92以下であり、
波長550nmにおける複屈折(Δn)及び前記波長分散(R450/R550)が下記数式(I)の関係を満足し、かつ
光弾性係数が25×10-12Pa-1以下である、位相差フィルム。
Δn ≧ 0.0140×(R450/R550)-0.0082 (I) - 前記熱可塑性樹脂のナトリウムd線(589nm)における屈折率が1.49~1.56である、請求項1に記載の位相差フィルム。
- 前記熱可塑性樹脂のガラス転移温度が120℃以上、160℃以下である、請求項1または2に記載の位相差フィルム。
- 前記熱可塑性樹脂の弾性率が1GPa以上、2.5GPa以下である、請求項1~3のいずれか1項に記載の位相差フィルム。
- 前記熱可塑性樹脂は、カーボネート結合及びエステル結合のうち少なくとも1種の結合基と、下記一般式(1)で表される構造単位及び下記一般式(2)で表される構造単位からなる群のうち1種以上の構造単位とを含む、請求項1~4のいずれか1項に記載の位相差フィルム。
(前記一般式(1)及び一般式(2)中、R1~R3は、それぞれ独立に、直接結合、置換基を有していてもよい炭素数1~4のアルキレン基であり、R4~R9は、それぞれ独立に、水素原子、置換基を有していてもよい炭素数1~10のアルキル基、置換基を有していてもよい炭素数4~10のアリール基、置換基を有していてもよい炭素数1~10のアシル基、置換基を有していてもよい炭素数1~10のアルコキシ基、置換基を有していてもよい炭素数1~10のアリールオキシ基、置換基を有していてもよい炭素数1~10のアシルオキシ基、置換基を有していてもよいアミノ基、置換基を有していてもよい炭素数1~10のビニル基、置換基を有していてもよい炭素数1~10のエチニル基、置換基を有する硫黄原子、置換基を有するケイ素原子、ハロゲン原子、ニトロ基、又はシアノ基である。但し、R4~R9のうち隣接する少なくとも2つの基が互いに結合して環を形成していてもよい。) - 前記熱可塑性樹脂は、前記一般式(1)又は前記一般式(2)で表される構造単位を合計で1質量%以上40質量%以下含有している、請求項5に記載の位相差フィルム。
- 前記熱可塑性樹脂における、芳香族基を含む構造単位(但し、前記一般式(1)で表される構造単位及び前記一般式(2)で表される構造単位を除く。)の含有量が5質量%以下である、請求項5または6に記載の位相差フィルム。
- 請求項1~8のいずれか1項に記載の位相差フィルムと、該位相差フィルムに積層された偏光子とを有する円偏光板。
- 請求項9に記載の円偏光板を備えた画像表示装置。
- 請求項9に記載の円偏光板を備えた有機ELパネル。
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Also Published As
Publication number | Publication date |
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EP3133424A1 (en) | 2017-02-22 |
CN106461836B (zh) | 2020-11-06 |
KR20160145582A (ko) | 2016-12-20 |
EP3133424A4 (en) | 2017-11-15 |
KR102285517B1 (ko) | 2021-08-03 |
EP3133424A8 (en) | 2017-04-12 |
TWI613466B (zh) | 2018-02-01 |
TW201546504A (zh) | 2015-12-16 |
JP2015212817A (ja) | 2015-11-26 |
US10754065B2 (en) | 2020-08-25 |
JP6823899B2 (ja) | 2021-02-03 |
US20170031061A1 (en) | 2017-02-02 |
CN106461836A (zh) | 2017-02-22 |
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