WO2014109350A1 - 樹脂組成物、トリアゾール化合物、光学フィルム、偏光板、光学レンズ、円偏光板及び画像表示装置 - Google Patents
樹脂組成物、トリアゾール化合物、光学フィルム、偏光板、光学レンズ、円偏光板及び画像表示装置 Download PDFInfo
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- WO2014109350A1 WO2014109350A1 PCT/JP2014/050202 JP2014050202W WO2014109350A1 WO 2014109350 A1 WO2014109350 A1 WO 2014109350A1 JP 2014050202 W JP2014050202 W JP 2014050202W WO 2014109350 A1 WO2014109350 A1 WO 2014109350A1
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Images
Classifications
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- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13363—Birefringent elements, e.g. for optical compensation
- G02F1/133638—Waveplates, i.e. plates with a retardation value of lambda/n
Definitions
- the present invention relates to a resin composition, a triazole compound contained therein, an optical film, an optical lens, a polarizing plate, a circularly polarizing plate, and an image display device produced using the resin composition. More specifically, a resin composition in which fluctuations in optical values depending on environmental humidity are suppressed, and a triazole compound contained therein, an optical film in which fluctuations in optical values depending on environmental humidity using the resin composition are suppressed, optical The present invention relates to a lens, a polarizing plate excellent in moisture resistance using the optical film, a circularly polarizing plate, and an image display device.
- Resins such as acrylic resin, polyester, polycarbonate, cellulose derivative, polyvinyl alcohol, and polyimide are highly transparent, lighter than inorganic glass, and easy to mold. Therefore, optical disks, liquid crystal display devices, and organic electroluminescence display devices (Hereinafter also referred to as organic EL display devices), such as optical films, optical lenses, and optical fibers, are widely used in the fields of optical technology and information equipment responsible for recording, displaying, and transmitting information.
- These resins include hydrogen bond donating sites (for example, hydrogen atoms of hydroxy groups and NH hydrogen atoms of amide groups) and hydrogen bond accepting sites (for example, carbonyl oxygen atoms of ester groups and aromatic heterocycles). Therefore, it has the property of adsorbing water by hydrogen bonding with water (hereinafter referred to as water adsorbing resin). For this reason, it absorbs water according to changes over time or external humidity environment, such as dimensional changes, mechanical characteristics such as rigidity and strength, electrical characteristics such as resistivity, optical characteristics such as refractive index, etc. There is a problem that changes in characteristics occur.
- the retardation film is used for the purpose of enlarging the viewing angle of the liquid crystal display device and for the purpose of preventing external light reflection of the organic EL display device, but the retardation of the film is a refraction in the direction perpendicular to the molecular orientation direction. Because it depends on the difference in rate (birefringence), it is sensitive to the amount of water adsorbed on the resin.
- the water adsorbing resin constituting the retardation film acrylic resin, polycarbonate, cellulose derivative, and the like are used.
- the cellulose derivative having high water adsorbing property (high water content) may be used in a time-dependent or external humidity environment. There is a problem that the change of the phase difference according to the change is particularly large.
- liquid crystal display devices and organic EL display devices have been expanded, and even higher quality is required for retardation films.
- liquid crystal display devices and organic EL display devices of large size and high quality are required to be used in a harsh environment as compared with the conventional case. For this reason, the retardation film used in these display devices has been desired to reduce the change in optical performance depending on the environmental humidity.
- Patent Document 1 discloses a method using a cellulose ester film containing polyester and a polyhydric alcohol ester or an aromatic terminal ester.
- Patent Document 2 discloses a method using a cellulose ester film containing a compound in which a value obtained by dividing the molecular weight by the total number of hydrogen bond donors and hydrogen bond acceptors is in a specific range.
- Patent Document 3 discloses a method using a cellulose ester film containing a highly hygroscopic compound having a moisture content difference of 2% or more.
- Patent Documents 1 to 3 The inventors have evaluated the methods described in Patent Documents 1 to 3 under conditions that are harsher than those of the prior art.
- the methods described in Patent Documents 1, 2, and 3 show a certain effect, but in recent years. It has been found that there is still insufficient improvement for use in display devices for high-quality applications, and further improvement is necessary.
- the present invention has been made in view of the above problems and situations, and a solution to that problem is to provide a resin composition in which fluctuations in optical values depending on environmental humidity are suppressed, and a triazole compound contained therein. . Moreover, it is providing the optical film and optical lens by which the optical value fluctuation
- the present inventors paid attention to the interaction mode between the water-adsorbing resin and the additive, and the hydrophobic aromatic compound having low hydrogen bondability and dipolar interaction is surprisingly well compatible with the water-adsorbing resin. Therefore, it was considered that the CH / ⁇ interaction functions between the CH portion of the water-adsorbing resin and the ⁇ electrons of the aromatic compound. If this CH / ⁇ interaction is positively utilized, the interaction between the additive and the resin becomes stronger than the interaction between the water molecule and the resin. As a result, the interaction between the water adsorbing resin and the additive is increased. It was considered that water could be prevented from entering and fluctuations in optical properties could be suppressed. Therefore, the present inventors examined means for strengthening this CH / ⁇ interaction.
- the present inventors prefer an aromatic compound having at least three specific aromatic rings having a specific NICS value and having the aromatic rings connected in close proximity. I guessed. As a result of examining various compounds based on these studies, the present inventors have found that the above compounds exhibit a particularly high inhibitory effect on optical value fluctuations depending on environmental humidity, and have reached the present invention.
- the compound having a 6-membered aromatic hydrocarbon ring or aromatic heterocycle has at least three of the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle having a NICS value smaller than or equal to that of the benzene ring. And at least one of them has a NICS value smaller than that of a benzene ring, and the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring is mutually bonded via a single bond or 2 or less atoms.
- the variation suppression rate of the retardation value (Ro value or Rt value) of the optical film produced using the resin composition is in the range of 20 to 100% under the following measurement conditions. 2.
- Measurement condition (A) An optical film (reference film) having the same film thickness as the produced optical film (sample film) and containing no compound having the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring, Made in the same way as the sample film, (B) The sample film and the reference film are immersed in pure water at a temperature of 23 ° C. for 24 hours. (C) About the sample film and the reference film, the retardation value Ro value and Rt value at a light wavelength of 590 nm at a temperature of 23 ° C. and a relative humidity of 55% were measured before and after water immersion, and retardation before and after water immersion. Absolute values ⁇ Ro and ⁇ Rt of the difference in values are obtained for each optical film. (D) The fluctuation suppression rate of the retardation value (Ro value and Rt value) is obtained by the following equation.
- Ro fluctuation suppression rate (%) ((reference film ⁇ Ro) ⁇ (sample film ⁇ Ro)) ⁇ (reference film ⁇ Ro) ⁇ 100
- Rt fluctuation suppression rate (%) ((reference film ⁇ Rt) ⁇ (sample film ⁇ Rt)) ⁇ (reference film ⁇ Rt) ⁇ 100 3.
- the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring is an pyrrole ring, pyrazole ring, imidazole ring, 1,2,3- Item 6.
- a 1 and A 2 each independently represents an alkyl group, a cycloalkyl group, an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- B represents an aromatic hydrocarbon ring or an aromatic heterocyclic ring.
- T 1 and T 2 each independently represents a pyrrole ring, a pyrazole ring, an imidazole ring, a 1,2,3-triazole ring or a 1,2,4-triazole ring, L 1 , L 2 , L 3 and L 4 each independently represents a single bond or a divalent linking group, and n represents an integer of 0 to 5.
- the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle is a compound having a structure represented by the following general formula (2): The resin composition as described in any one of these.
- a 1 , A 2 , T 1 , T 2 , L 1 , L 2 , L 3 and L 4 are respectively A 1 , A 2 , T 1 , T 2 , L in the general formula (1). 1, L 2, L 3 and .A 3 and T 3 L 4 as synonymous, the .L 5 and L 6 represent the same group as a 1 and T 1, respectively, in the general formula (1), the general Represents the same group as L 1 in formula (1), and m represents an integer of 0 to 4.) 11.
- the compound having the structure represented by the general formula (1) is a triazole compound having a structure represented by the following general formula (1.1). .
- a 1, B, L 1 and L 2, .k representing the A 1, B, the same group as L 1 and L 2 in formula (1) represents an integer of 1-4
- T 1 represents a 1,2,4-triazole ring.
- Z represents a structure of the following general formula (1.2a).
- Q represents an integer of 2 to 3.
- At least two Zs represent at least one Z substituted on a benzene ring. Bonded to ortho or meta position.
- R 10 represents a hydrogen atom, an alkyl group or an alkoxy group.
- P represents an integer of 1 to 5. * represents a bonding position with a benzene ring.
- T 1 represents a 1,2,4-triazole ring. Represents.) 13.
- the addition amount of the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle is in the range of 1 to 15% by mass with respect to the resin.
- the retardation value Ro in the in-plane direction represented by the following formula (I) at a light wavelength of 590 nm is within the range of 40 to 100 nm, and the following formula (II) Item 15.
- a polarizing plate wherein the optical film according to any one of items 13 to 16 is provided on at least one surface of a polarizer.
- a circularly polarizing plate wherein the optical film according to any one of items 13 to 16 is provided on at least one surface of a polarizer.
- An image display device comprising the optical film according to item 15 or 16.
- Item 20 The image display device according to item 19, wherein the image display device is a liquid crystal display device provided with the polarizing plate according to item 17 on at least one surface of a liquid crystal cell.
- Item 21 The image display device according to Item 20, wherein the liquid crystal cell is a VA type liquid crystal cell.
- Item 20 The image display device according to Item 19, wherein the image display device is an organic electroluminescence display device in which the circularly polarizing plate according to Item 18 is provided in an organic electroluminescence element.
- Z represents a structure of the following general formula (1.2a).
- Q represents an integer of 2 to 3.
- At least two Zs represent at least one Z substituted on a benzene ring. Bonded to ortho or meta position.
- R 10 represents a hydrogen atom, an alkyl group or an alkoxy group.
- P represents an integer of 1 to 5. * represents a bonding position with a benzene ring.
- the above means of the present invention it is possible to provide a resin composition in which fluctuations in optical values depending on environmental humidity are suppressed and a triazole compound contained therein. Moreover, the optical film and optical lens by which the optical value fluctuation
- the present invention relates to a technology for allowing an organic compound to coexist as an additive in a water adsorbent resin having a high affinity for water molecules, and has heretofore been a water adsorbent resin that has not been assumed as a main interaction with the resin.
- the so-called “CH / ⁇ interaction” due to the CH moiety present in the water and the ⁇ electrons of the additive is regarded as a special interaction, and by using a plurality of these in combination, water that intrudes over time or during processing We believe that we were able to suppress fluctuations in optical properties caused by molecules as much as possible.
- Schematic diagram showing an example of the configuration of a liquid crystal display device Schematic diagram showing an example of the configuration of an organic EL display device Schematic diagram explaining the antireflection function by circularly polarizing plates
- the resin composition of the present invention is a resin composition containing at least a resin and a compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle, wherein the resin is a water-adsorbing resin.
- the compound having the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle has a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle having a NICS value smaller than or equal to that of the benzene ring.
- the fluctuation suppression rate of the retardation value (Ro value or Rt value) of the optical film produced using the resin composition is within the range of 20 to 100% under the measurement conditions.
- the water-absorbing resin has a water absorption rate at 23 ° C. in the range of 0.5 to 10% by mass, and that the water-adsorbing resin is a cellulose derivative or a cellulose ester. It is preferable from the viewpoint of manifesting the effects of the invention.
- the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring is an pyrrole ring, pyrazole ring, imidazole ring, 1,2,3- It preferably has a triazole ring or a 1,2,4-triazole ring.
- the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle is preferably a compound having a structure represented by the general formula (1).
- L 1 , L 2 , L 3 and L 4 each independently represent a single bond.
- the T 1 and T 2 are each independently preferably represents a pyrazole ring.
- the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle is preferably a compound having a structure represented by the general formula (2).
- the compound having the structure represented by the general formula (1) is preferably a triazole compound having a structure represented by the general formula (1.1).
- the triazole compound having the structure represented is preferably a triazole compound having the structure represented by the general formula (1.2).
- the optical film is produced using the resin composition.
- This optical film has an in-plane retardation value Ro represented by the above formula (I) within a range of 40 to 100 nm with respect to light having a light wavelength of 590 nm in an environment of 23 ° C. and 55% RH.
- the retardation value Rt in the thickness direction represented by the following formula (II) is preferably in the range of 100 to 300 nm.
- the retardation values Ro in the in-plane direction at light wavelengths of 450 nm, 550 nm, and 650 nm are set to Ro (450), Ro (550), and Ro (650), respectively, in an environment of 23 ° C. and 55% RH, It is preferable that Ro (450), Ro (550), and Ro (650) satisfy the above formulas (a1) to (a3).
- the optical film can be suitably provided in a polarizing plate or a circular polarizing plate provided on at least one surface of a polarizer, and further in an image display device.
- a liquid crystal display device in which the polarizing plate is provided on at least one surface of the liquid crystal cell is preferable.
- the liquid crystal cell is preferably a VA liquid crystal cell.
- the image display device is preferably an organic EL display device in which the circularly polarizing plate is provided in an organic EL element.
- the optical lens is manufactured using the resin composition.
- ⁇ is used to mean that the numerical values described before and after it are included as a lower limit value and an upper limit value.
- the resin composition of the present invention is a resin composition containing at least a resin and a compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle, wherein the resin is a water-adsorbing resin.
- the compound having the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle has a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle having a NICS value smaller than or equal to that of the benzene ring.
- the interaction between the additive and the resin is stronger than the interaction between the water molecule and the resin, and as a result, water can be prevented from entering between the water-adsorbing resin and the additive. Therefore, it was considered that the fluctuation of the optical characteristics, which is the problem, can be suppressed. As a result of examining various compounds based on such an idea, it was found that a specific compound exhibits a high inhibitory effect, and the present invention has been achieved.
- the present invention relates to a technology for allowing an organic compound to coexist as an additive in a water-adsorbent resin having a high affinity for water molecules. From a technical idea different from the conventional one, a plurality of special interactions are used in combination. Therefore, it is an invention characterized by an additive that can exert a constant interaction force regardless of the presence of water molecules, and the essence of the technology has not been assumed as a main interaction with a resin conventionally A water molecule that intrudes with time or during treatment by considering a CH / ⁇ interaction due to a CH moiety present in the resin and a ⁇ electron of the additive as the special interaction and using a plurality of these in combination. It is estimated that the variation of the optical characteristics caused by the above has been successfully suppressed.
- a hydrogen bond donating site for example, a hydrogen atom of a hydroxy group or an NH hydrogen atom of an amide group
- a hydrogen bond accepting site for example, a carbonyl oxygen atom of an ester group
- a nitrogen atom contained in an aromatic heterocycle, etc. to form a hydrogen bond with the additive so that the additive is compatible with the water adsorbent resin and used in the optical film.
- the water adsorbent resin Even when hydrogen bonding is not used, the water adsorbent resin always has a site that localizes electrons called polar groups, so it can have a large dipole moment locally or throughout the resin, By giving the additive a corresponding dipole moment, so-called “dipole-dipole interaction” is developed, and it is used as a main stabilization means to It is also known to be compatible.
- the water-adsorbing resin is premised on using a hydrogen bond or a dipole-dipole interaction as an intermolecular force for compatibilizing the additive as described above.
- water molecules When hydrogen bonds are used as compatible intermolecular forces, water molecules have both hydrogen atoms as hydrogen bond donating moieties and oxygen atoms as hydrogen bond accepting moieties, and have a small molecular size.
- water molecules invade over time or during processing, there are an order of magnitude more than water adsorbent resins and additives in terms of the number of molecules.
- the binding sites are in a form in which water molecules are hydrogen bonded in a considerable proportion. For this reason, the hydrogen bonding property of the resin itself is weakened, and at the same time, water is hydrogen bonded to the additive, so the hydrogen bonding property is also weakened.
- the interaction between the water adsorbing resin and the additive does not function. . That is, since water molecules can easily intervene between the water-adsorbing resin and the additive, it is difficult to suppress fluctuations in optical characteristics.
- the present invention is based on the above hypothesis, if the additive can have a special interaction that does not essentially change the interaction force depending on the presence or absence of water molecules with respect to the water-adsorbing resin. It was estimated that water could be prevented from entering between the adsorbent resin and the additive, and the above-mentioned problems were overcome.
- An aromatic compound has a ring current derived from ⁇ electrons. As a result, an induced magnetic field is generated.
- a hydrogen atom usually C—H
- an attractive force is received, and a force in which the CH and the ⁇ plane are close to each other works.
- Such a force is referred to as “CH / ⁇ interaction”.
- the CH 2 proton of sulfomorpholine in the image stabilizer unit is greatly shifted due to the ⁇ current effect with the phenyl group in the opposite dye.
- the term “paired” refers to a state in which CH 2 protons are present in the vicinity of the center of the phenyl group in the dye at a specific distance (a distance sufficiently close to the CH / ⁇ interaction). This phenomenon can also be confirmed in a molecular model, and the CH / ⁇ interaction between CH of the image stabilizer and the phenyl group ( ⁇ ) of the dye is an intermolecular force necessary to form this conformation. I understand that.
- the sulfomorpholine ring as described above does not face the phenyl group of the dye.
- the image stabilizer portion exists in a state far from the dye portion, that is, the CH / ⁇ interaction causes the organic compound and the organic compound to be separated. It can be considered that it can be an effective intermolecular force to connect.
- NICS nucleus-independent chemical shift
- This NICS value is an index used for quantification of aromaticity by magnetic properties. If the ring is aromatic, the ring current effect strongly shields the center of the ring, and conversely if it is antiaromatic. Anti-shielding (J. Am. Chem. Soc. 1996, 118, 6317). Depending on the magnitude of the NICS value, it is possible to determine the strength of the ring current, that is, the degree of contribution of ⁇ electrons to the aromaticity of the ring. Specifically, it represents the chemical shift (calculated value) of a virtual lithium ion arranged directly in the center of the ring, and the larger the value, the stronger the ⁇ property.
- the NICS value is calculated using Gaussian 03 (Revision B.03, US Gaussian software). Specifically, from the structure optimized using B3LYP (density functional method) as the calculation method and 6-31 + G (function in which the diffusion gauss function is added to the split valence basis set) as the basis function, the NMR shielding constant It is calculated by a calculation method (GIAO).
- GIAO a calculation method
- a 5-membered aromatic heterocyclic ring such as a pyrrole ring, a thiophene ring, or a furan ring has a negative NICS value rather than an aromatic hydrocarbon such as a benzene ring or a naphthalene ring. It is expected that the CH / ⁇ interaction can be strengthened by using such an aromatic five-membered ring.
- the intermolecular force contributed by ⁇ electrons includes ⁇ / ⁇ interaction in addition to CH / ⁇ interaction.
- the ⁇ / ⁇ interaction is an intermolecular force that acts between two aromatic rings. Since an aromatic ring has a high polarizability, it is an intermolecular force that greatly contributes to dispersion force (London dispersion force). For this reason, an aromatic ring having a wide ⁇ -conjugated system has a higher polarizability and is likely to interact with ⁇ / ⁇ .
- Benzene which is a 6 ⁇ -electron system, has the most stable structure when one benzene ring is placed perpendicular to one benzene ring and a benzene ring and a hydrogen atom interact with each other.
- Naphthalene (10 ⁇ electrons) and anthracene (14 ⁇ electrons) with a wide system are most stable when the aromatic rings are stacked by ⁇ / ⁇ interaction. Is strong.
- a compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle has a 5-membered or 6-membered aromatic carbonization whose NICS value is smaller than or equal to that of the benzene ring.
- the present invention has a CH / ⁇ interaction that does not have any relationship with water molecules or does not change its strength even when water molecules are adsorbed, with respect to a resin that is inherently adsorbed with water.
- This is a universal technique that makes it difficult to change the optical properties of the resin composition during storage or water treatment by using a plurality of interactions that have not been used so far as a means for coexistence of a resin and an additive.
- the combined use of a water adsorbent resin and an aromatic compound which happens to be described in existing literature or patent literature, is an invention with a different technical idea in the first place. It can be said that the present invention, which is highly developable and expandable in the future, and is constructed based on a new technical idea, is positioned as an advanced and universal technology.
- the variation suppression rate of the retardation value (Ro value or Rt value) of the optical film produced using the resin composition of the present invention is in the range of 20 to 100% under the following measurement conditions. To do.
- the Ro value is the retardation value in the in-plane direction of the optical film, and Rt is the retardation value in the thickness direction. Details will be described later. Measurement conditions (a) Optical film (reference film) having the same film thickness as the produced optical film (sample film) and containing no compound having the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle Is made in the same way as the sample film, (B) The sample film and the reference film are immersed in pure water at a temperature of 23 ° C. for 24 hours. (C) About the sample film and the reference film, the retardation value Ro value and Rt value at a light wavelength of 590 nm at a temperature of 23 ° C.
- Ro fluctuation suppression rate (%) ((reference film ⁇ Ro) ⁇ (sample film ⁇ Ro)) ⁇ (reference film ⁇ Ro) ⁇ 100
- Rt fluctuation suppression rate (%) ((reference film ⁇ Rt) ⁇ (sample film ⁇ Rt)) ⁇ (reference film ⁇ Rt) ⁇ 100
- the sample film and the optical film of the reference film can be produced by a known method with a constant film thickness and a constant thickness.
- the same film thickness means the range of 10 to 100 ⁇ m, and preferably 20 to 70 ⁇ m from the viewpoint of rapid measurement. More preferably, it is in the range of 30 to 50 ⁇ m.
- the content of the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring contained in the sample film used for the measurement is in the range of 1 to 15% by mass with respect to 100% of the resin. It is preferable. It is preferably in the range of 2 to 10% by mass. More preferably, it is in the range of 2 to 5% by mass. If it is in this range, there is little fluctuation of the optical value depending on the change of environmental humidity, and an optical film excellent in compatibility with the resin and bleed-out resistance can be obtained.
- the fluctuation suppression rate of the retardation value (Ro value and Rt value) of the optical film produced using the resin composition of the present invention is such that the Ro fluctuation suppression rate or the Rt fluctuation suppression rate is in the range of 50 to 100%. More preferably, the Ro variation suppression rate or the Rt variation suppression rate is more preferably in the range of 70 to 100%. In particular, it is preferable that both the Ro fluctuation suppression rate and the Rt fluctuation suppression rate are excellent.
- the fluctuation of the phase difference value according to the change of the environmental humidity is evaluated by the difference in the phase difference value between the low humidity condition and the high humidity condition at a constant temperature.
- Evaluation was based on the difference in phase difference value after soaking in water for a certain period of time. Since the film is directly exposed to water, the evaluation conditions of the present invention are harsher than conventional ones.
- the retardation value can be measured at an optical wavelength of 590 nm using an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments).
- the optical film in an environment of 55% RH, subjected to refractive index measurement of three-dimensional at 10 locations in the optical wavelength 590 nm, the average value of the refractive index n x, n y, n z Thereafter, the retardation value Ro in the in-plane direction and the retardation value Rt in the thickness direction can be calculated according to the following formulas (I) and (II).
- n x a refractive index in the direction x in which the refractive index is maximized in the plane direction of the film.
- n y in-plane direction of the film, the refractive index in the direction y perpendicular to the direction x.
- nz represents the refractive index in the thickness direction z of the film.
- d represents the thickness (nm) of the film.
- the resin is a water-adsorbing resin and the compound having a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle has a NICS value smaller than or equal to that of the benzene ring. It has at least three of either a 5-membered or 6-membered aromatic hydrocarbon ring or an aromatic heterocycle, and at least one of them has a NICS value smaller than that of a benzene ring, and the 5-membered or 6-membered aromatic Group hydrocarbon rings or aromatic heterocycles connected to each other through a single bond or 2 or less atoms (hereinafter also referred to as additive N).
- Such additives are coordinated by a plurality of CH / ⁇ interaction forces with respect to the water-adsorbing resin, so that water molecules can be prevented from entering between the water-adsorbing resin and the additive.
- it is preferable because fluctuations in optical characteristics can be reduced.
- the 5-membered or 6-membered aromatic ring having a NICS value equal to or lower than the benzene ring may be a single ring or may have a substituent.
- the substituents may be bonded to each other to form a ring, and the formed ring may have ⁇ electrons.
- the 5-membered or 6-membered aromatic ring having a NICS value of a benzene ring or less is preferably a 6 ⁇ electron system.
- a wide ⁇ -conjugated aromatic ring such as naphthalene ring (10 ⁇ ), benzoxazole ring (10 ⁇ ), anthracene ring (14 ⁇ ), etc. has a strong ⁇ / ⁇ interaction as described above. Since the ⁇ / ⁇ interaction between the additives is larger than the CH / ⁇ interaction, the 6 ⁇ -electron aromatic ring is more compatible with the water-adsorbing resin and causes a bleed-out during the passage. Even when they are compatible, since the distance between the water-adsorbing resin and the additive is close, the optical characteristics are less likely to fluctuate.
- the structure of the aromatic ring is not limited as long as the NICS value is smaller than that of the benzene ring.
- an aromatic ring containing only a nitrogen atom as a hetero atom other than the carbon atom forming the aromatic ring is preferable because it has a smaller NICS value and is excellent in an effect of suppressing fluctuations in optical
- an aromatic ring containing only a nitrogen atom as a hetero atom other than a carbon atom forming an aromatic ring is less likely to cause reaction or decomposition in the coexistence with a water-adsorbing resin, and has a resin composition with excellent durability. Obtained and preferred.
- the aromatic ring having a smaller NICS value than the benzene ring is preferably a pyrrole ring, a pyrazole ring, an imidazole ring, a 1,2,3-triazole ring or a 1,2,4-triazole ring.
- a 5-membered or 6-membered aromatic ring having a NICS value of at least three benzene rings or less is connected to each other via a single bond or two or less atoms, whereby the water adsorbent resin and the additive CH / It is preferable because the ⁇ interaction becomes strong and fluctuations in optical properties can be suppressed.
- the term “linked through two or less atoms” means that the minimum number of atoms existing between the connected substituents among the atoms constituting the linking group is two or less.
- the number of connecting atoms of the ether group (—O—) is 1, the number of connecting atoms of the ester group (—CO—O—) is 2, and the number of connecting atoms of the carbonate group (—O—CO—O—). Is 3. In order to further suppress variation in optical characteristics, a single bond is more preferable.
- a 5-, 6-membered aromatic ring having a NICS value of at least 3 benzene rings or less is set as A, B, C, and when A, B, B, and C are connected, A, B, B, and C
- a smaller dihedral angle is preferable because each aromatic ring can simultaneously form a CH / ⁇ interaction. If the dihedral angle is too small, the ⁇ / ⁇ interaction tends to be dominant. For this reason, the dihedral angles of A and B and B and C are each preferably 0 ° to 45 °, more preferably 5 ° to 40 °, and more preferably 10 ° to 35 °. Is preferred.
- the additive N is particularly preferably a compound having a structure represented by the following general formula (1).
- a 1 , A 2 and B are each independently an alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2- An ethenyl group), a cycloalkyl group (cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group, etc.), an aromatic hydrocarbon ring or an aromatic heterocycle.
- an aromatic hydrocarbon ring or an aromatic heterocyclic ring is preferable, and a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring having a NICS value smaller than or equal to that of the benzene ring is particularly preferable.
- the structure of the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocyclic ring is not limited.
- the 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle having a NICS value equal to or lower than the benzene ring represented by A 1 , A 2 and B may have a substituent.
- a halogen atom fluorine atom, chlorine atom, bromine atom, iodine atom, etc.
- alkyl group methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2 -Ethylhexyl group etc.
- cycloalkyl group cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group etc.
- alkenyl group vinyl group, allyl group etc.
- cycloalkenyl group (2-cyclopenten-1-yl, 2 -Cyclohexen-1-yl group)
- a 1 , A 2 and B may represent a benzene ring, a pyrrole ring, a pyrazole ring, an imidazole ring, a 1,2,3-triazole ring or a 1,2,4-triazole ring. It is preferable because a resin composition having excellent optical property variation effects and excellent durability can be obtained.
- T 1 and T 2 preferably each independently represent a pyrrole ring, a pyrazole ring, an imidazole ring, a 1,2,3-triazole ring or a 1,2,4-triazole ring. .
- a pyrazole ring or a 1,2,4-triazole ring is preferable because a resin composition particularly excellent in the effect of suppressing fluctuation in optical properties and particularly excellent in durability can be obtained.
- the pyrazole ring, imidazole ring, 1,2,3-triazole ring or 1,2,4-triazole ring represented by T 1 and T 2 may be a tautomer. Specific structures of the pyrrole ring, pyrazole ring, imidazole ring, 1,2,3-triazole ring or 1,2,4-triazole ring are shown below.
- R 5 represents a hydrogen atom or a non-aromatic substituent.
- the non-aromatic substituent represented by R5 include the same groups as the non-aromatic substituent among the substituents that A 1 in the general formula (1) may have.
- R 5 is preferably a hydrogen atom, an alkyl group having 1 to 5 carbon atoms or an acyl group having 1 to 5 carbon atoms, and particularly preferably a hydrogen atom.
- T 1 and T 2 may have a substituent, and examples of the substituent include the substituent that A 1 and A 2 in the general formula (1) may have Similar groups can be mentioned.
- L 1 , L 2 , L 3 and L 4 each independently represent a single bond or a divalent linking group, and are 5 or 6 via 2 or less atoms. Membered aromatic hydrocarbon rings or aromatic heterocycles are linked.
- the term “via two or less atoms” refers to the minimum number of atoms existing between the connected substituents among the atoms constituting the linking group.
- the divalent linking group having 2 or less linking atoms is not particularly limited, but includes an alkylene group, an alkenylene group, an alkynylene group, O, (C ⁇ O), NR, S, and (O ⁇ S ⁇ O). It is a divalent linking group selected from the group consisting of or a linking group in which two of them are combined.
- R represents a hydrogen atom or a substituent.
- substituent represented by R include an alkyl group (methyl group, ethyl group, n-propyl group, isopropyl group, tert-butyl group, n-octyl group, 2-ethylhexyl group, etc.), cycloalkyl group ( Cyclohexyl group, cyclopentyl group, 4-n-dodecylcyclohexyl group, etc.), aromatic hydrocarbon ring group (phenyl group, p-tolyl group, naphthyl group, etc.), aromatic heterocyclic group (2-furyl group, 2-thienyl group, etc.) Group, 2-pyrimidinyl group, 2-benzothiazolyl group, 2-pyridyl group, etc.), cyano group and the like.
- the divalent linking group represented by L 1 , L 2 , L 3 and L 4 may have a substituent, and the substituent is not
- L 1 , L 2 , L 3, and L 4 are CH / ⁇ mutual with the water-adsorbing resin by increasing the planarity of the compound represented by the general formula (1). Since the action becomes stronger and fluctuations in optical properties are suppressed, a single bond, or O, (C ⁇ O) —O, O— (C ⁇ O), (C ⁇ O) —NR or NR— (C ⁇ O), and more preferably a single bond.
- n represents an integer of 0 to 5.
- the plurality of A 2 , T 2 , L 3 and L 4 in the general formula (1) may be the same or different.
- n increases, the CH / ⁇ interaction between the compound represented by the general formula (1) and the water-adsorbing resin becomes stronger, so that the effect of suppressing fluctuations in optical properties is better. Excellent compatibility with functional resin.
- n is preferably an integer of 1 to 3, more preferably an integer of 1 to 2.
- the compound represented by the general formula (1) is preferably a compound represented by the general formula (2).
- a 1 , A 2 , T 1 , T 2 , L 1 , L 2 , L 3 and L 4 are respectively A 1 , A 2 , T 1 , T 2 , L in the general formula (1). 1, L 2, L 3 and .A 3 and T 3 L 4 as synonymous, the .L 5 and L 6 represent the same group as a 1 and T 1, respectively, in the general formula (1), the general Represents the same group as L 1 in formula (1), and m represents an integer of 0 to 4.
- a smaller m is superior in compatibility with the cellulose ester, and therefore m is preferably an integer of 0 to 2, more preferably an integer of 0 to 1.
- the compound having a structure represented by the general formula (1) is preferably a triazole compound having a structure represented by the following general formula (1.1).
- the triazole compound having a structure represented by the general formula (1.1) is preferably a triazole compound having a structure represented by the following general formula (1.2).
- Z represents a structure of the following general formula (1.2a).
- Q represents an integer of 2 to 3.
- At least two Zs represent at least one Z substituted on a benzene ring. Bonded to ortho or meta position.
- R 10 represents a hydrogen atom, an alkyl group or an alkoxy group.
- P represents an integer of 1 to 5.
- * represents a bonding position with a benzene ring.
- T 1 represents a 1,2,4-triazole ring.
- the compound represented by the general formula (1), (2), (1.1) or (1.2) may form a hydrate, a solvate or a salt.
- the hydrate may contain an organic solvent
- the solvate may contain water. That is, “hydrate” and “solvate” include mixed solvates containing both water and organic solvents. Salts include acid addition salts formed with inorganic or organic acids.
- inorganic acids include, but are not limited to, hydrohalic acids (hydrochloric acid, hydrobromic acid, etc.), sulfuric acid, phosphoric acid, and the like.
- organic acids include acetic acid, trifluoroacetic acid, propionic acid, butyric acid, oxalic acid, citric acid, benzoic acid, alkylsulfonic acid (methanesulfonic acid, etc.), allylsulfonic acid (benzenesulfonic acid, 4-toluene) Sulfonic acid, 1,5-naphthalenedisulfonic acid, and the like), but are not limited thereto.
- hydrochloride, acetate, propionate and butyrate are preferable.
- salts are those in which the acidic moiety present in the parent compound is a metal ion (eg, an alkali metal salt, such as sodium or potassium salt, an alkaline earth metal salt, such as calcium or magnesium salt, an ammonium salt, an alkali metal ion, alkaline earth And salts formed when substituted with organic bases (ethanolamine, diethanolamine, triethanolamine, morpholine, piperidine, etc.) It is not limited. Of these, sodium salts and potassium salts are preferred.
- a metal ion eg, an alkali metal salt, such as sodium or potassium salt, an alkaline earth metal salt, such as calcium or magnesium salt, an ammonium salt, an alkali metal ion, alkaline earth
- organic bases ethanolamine, diethanolamine, triethanolamine, morpholine, piperidine, etc.
- sodium salts and potassium salts are preferred.
- Examples of the solvent contained in the solvate include any common organic solvent. Specifically, alcohol (eg, methanol, ethanol, 2-propanol, 1-butanol, 1-methoxy-2-propanol, t-butanol), ester (eg, ethyl acetate), hydrocarbon (eg, toluene, hexane) , Heptane), ether (eg, tetrahydrofuran), nitrile (eg, acetonitrile), ketone (acetone) and the like.
- alcohol eg, methanol, ethanol, 2-propanol, 1-butanol, 1-methoxy-2-propanol, t-butanol
- ester eg, ethyl acetate
- hydrocarbon eg, toluene, hexane
- Heptane Heptane
- ether eg, tetrahydrofuran
- nitrile
- solvates of alcohols eg, methanol, ethanol, 2-propanol, 1-butanol, 1-methoxy-2-propanol, t-butanol.
- solvents may be a reaction solvent used at the time of synthesizing the compound, a solvent used at the time of crystallization purification after synthesis, or a mixture thereof.
- two or more kinds of solvents may be included at the same time, or a form containing water and a solvent (for example, water and alcohol (for example, methanol, ethanol, t-butanol, etc.), etc.).
- a solvent for example, water and alcohol (for example, methanol, ethanol, t-butanol, etc.), etc.).
- the molecular weight of the compound represented by the general formula (1), (2), (1.1) or (1.2) is not particularly limited. However, the smaller the molecular weight, the better the compatibility with the resin, and the larger the environmental weight. In view of the high effect of suppressing the fluctuation of the optical value with respect to the change, the value is preferably 150 to 2000, more preferably 200 to 1500, and more preferably 300 to 1000.
- the compound represented by the general formula (1) can be synthesized by a known method.
- any compound having a 1,2,4-triazole ring may be used, but there is a method of reacting a nitrile derivative or imino ether derivative with a hydrazide derivative. preferable.
- the solvent used for the reaction may be any solvent as long as it does not react with the raw material, but may be any ester type (eg, ethyl acetate, methyl acetate), amide type (dimethylformamide, dimethylacetamide, etc.), ether type (Ethylene glycol dimethyl ether, etc.), alcohols (eg, methanol, ethanol, propanol, isopropanol, n-butanol, 2-butanol, ethylene glycol, ethylene glycol monomethyl ether, etc.), aromatic hydrocarbons (eg, toluene, xylene, etc.) ), Water can be mentioned.
- an alcohol solvent is preferable. These solvents may be used as a mixture.
- the amount of the solvent used is not particularly limited, but is preferably in the range of 0.5 to 30 times the amount of the hydrazide derivative used, more preferably 1.0 to 25 times the amount. Yes, particularly preferably in the range of 3.0 to 20 times the amount.
- a catalyst When reacting a nitrile derivative and a hydrazide derivative, it is not necessary to use a catalyst, but it is preferable to use a catalyst in order to accelerate the reaction.
- a catalyst to be used an acid may be used and a base may be used.
- the acid include hydrochloric acid, sulfuric acid, nitric acid, acetic acid and the like, preferably hydrochloric acid.
- the acid may be added after diluted in water, or may be added by a method of blowing a gas into the system.
- Bases include inorganic bases (potassium carbonate, sodium carbonate, potassium bicarbonate, sodium bicarbonate, potassium hydroxide, sodium hydroxide, etc.) and organic bases (sodium methylate, sodium ethylate, potassium methylate, potassium ethylate, Sodium butyrate, potassium butyrate, diisopropylethylamine, N, N′-dimethylaminopyridine, 1,4-diazabicyclo [2.2.2] octane, N-methylmorpholine, imidazole, N-methylimidazole, pyridine, etc.) Any of them may be used, and the inorganic base is preferably potassium carbonate, and the organic base is preferably sodium ethylate, sodium ethylate or sodium butyrate.
- the inorganic base may be added as a powder or may be added in a state dispersed in a solvent.
- the organic base may be added in a state dissolved in a solvent (for example, a
- the amount of the catalyst used is not particularly limited as long as the reaction proceeds, but it is preferably in the range of 1.0 to 5.0 moles relative to the formed triazole ring, and more preferably 1.05 to 3. A range of 0-fold mole is preferable.
- the target product can be obtained by heating in a solvent.
- the addition method of the raw material, solvent and catalyst used for the reaction is not particularly limited, and the catalyst may be added last, or the solvent may be added last. Also preferred is a method of dispersing or dissolving a nitrile derivative in a solvent, adding a catalyst, and then adding a hydrazide derivative.
- the solution temperature during the reaction may be any temperature as long as the reaction proceeds, but is preferably in the range of 0 to 150 ° C., more preferably in the range of 20 to 140 ° C. Moreover, you may react, removing the water to produce
- any method may be used for treating the reaction solution, but when a base is used as a catalyst, a method of neutralizing the reaction solution by adding an acid is preferable.
- the acid used for neutralization include hydrochloric acid, sulfuric acid, nitric acid, and acetic acid. Acetic acid is particularly preferable.
- the amount of the acid used for neutralization is not particularly limited as long as the pH of the reaction solution is in the range of 4 to 9, but is preferably 0.1 to 3 moles, particularly preferably, relative to the base used. , In the range of 0.2 to 1.5 moles.
- the appropriate organic solvent is a water-insoluble solvent such as ethyl acetate, toluene, dichloromethane, ether, or a mixed solvent of the water-insoluble solvent and tetrahydrofuran or an alcohol solvent, preferably Ethyl acetate.
- Exemplified Compound 1 can be synthesized by the following scheme.
- the precipitate collected by filtration was dissolved in 80 ml of methanol, 300 ml of pure water was added, and acetic acid was added dropwise until the pH of the solution reached 7.
- the precipitated crystals were collected by filtration, washed with pure water, and blown dry at 50 ° C. to obtain 38.6 g of Exemplified Compound 1.
- the yield was 70% based on benzoylhydrazine.
- the 1 H-NMR spectrum of the obtained exemplary compound 176 is as follows. In order to avoid complication of chemical shift due to the presence of tautomers, the measurement was performed by adding a few drops of trifluoroacetic acid to the measurement solvent.
- the compound represented by the general formula (1) according to the present invention can be appropriately adjusted to be contained in the optical film, but the added amount is a resin (for example, cellulose ester) that forms the optical film.
- the content is preferably 1 to 15% by mass, more preferably 2 to 10% by mass.
- only 1 type of compound which has a structure represented by the said General formula (1) may be used, and the multiple types of compound which has a structure represented by the said General formula (1) may be used together. If it is in this range, the fluctuation of the optical value depending on the change of the environmental humidity can be reduced without impairing the mechanical strength of the optical film of the present invention.
- the compound represented by the general formula (1) it may be added to the resin forming the optical film as a powder, or after being dissolved in a solvent, it is added to the resin forming the optical film. May be.
- the present invention changes the optical properties of the resin composition during storage or water treatment by using a plurality of interactions that have not been used as a means for coexistence of resin and additive, that is, CH / ⁇ interaction. It is a universal technology that makes it difficult.
- the combined use of a water adsorbent resin and an aromatic compound, which happens to be described in existing literature or patent literature, is an invention with a different technical idea in the first place. It can be said that the present invention, which is highly developable and expandable in the future, and is constructed based on a new technical idea, is positioned as an advanced and universal technology.
- Patent Document 4 JP 2012-215817 A discloses a retardation of a cellulose acylate film depending on environmental humidity by adding a highly hygroscopic compound having a water content difference of 2% or more in an amorphous state.
- a method for reducing the change is disclosed. This is because, in a cellulose acylate film under a high humidity environment, a highly hygroscopic compound having a triazine structure coordinates preferentially with water molecules, thereby coordinating water molecules to the carbonyl group of cellulose acylate.
- a technical idea for reducing the change in retardation due to environmental humidity is described.
- the triazine structure has low aromaticity as suggested by the value of NICS larger than that of the benzene ring, and sufficient CH / ⁇ interaction cannot be obtained with the resin. For this reason, in the presence of water molecules, water molecules cannot be prevented from entering between the water-adsorbing resin and the additive, and the effects of the present application cannot be obtained.
- JP-A-2004-243628 discloses a method of adding a retardation increasing agent to a cellulose ester to suppress bleed out of the retardation increasing agent. This describes a technical idea of suppressing bleeding out by using a triazine compound as a retardation increasing agent and controlling the step of casting a cellulose ester solution and the first half of drying before peeling.
- the triazine compounds used in the patent also disclose those containing a pyrazole structure as a substituent.
- the patent does not include a description suggesting the CH / ⁇ interaction, which is the technical idea of the present application, and the triazine structure has an aromatic fragrance as suggested by a large NICS value.
- the affinity is low, and sufficient CH / ⁇ interaction cannot be obtained with the resin. For this reason, in the presence of water molecules, water molecules cannot be prevented from entering between the water-adsorbing resin and the additive, and the effects of the present application cannot be obtained.
- Patent Document 6 JP 2000-1191414 A discloses a retardation increasing agent for a lower fatty acid ester film of cellulose having at least two aromatic rings. This describes a technical idea in which at least two aromatic rings have a structure that does not sterically hinder the conformation, so that the two aromatic rings are positioned on the same plane and increase retardation.
- the pyrazole ring (a) and the 5-position benzene ring (d) also have a structure twisted about 45 degrees. Therefore, a and b can form a CH / ⁇ interaction simultaneously with the resin, but c and d are twisted about 45 degrees with respect to the plane of the pyrazole ring, so that the resin and CH simultaneously with a and b.
- the / ⁇ interaction cannot be formed. Therefore, in the presence of water molecules, a CH / ⁇ interaction sufficient to prevent water molecules from entering between the water-adsorbing resin and the additive cannot be imparted, and the effect of the present application is significantly reduced.
- the patent describes a compound having a 10 ⁇ -electron aromatic ring such as benzoxazole or benzotriazole, but as described above, such a compound has a ⁇ / ⁇ mutual relationship between compounds. Since the action is more dominant than the CH / ⁇ interaction between the resin and the compound, the CH / ⁇ interaction is provided so as to suppress the penetration of water molecules between the water-adsorbing resin and the additive. I can't.
- Patent Document 7 discloses an additive for increasing the wavelength dispersion of retardation in an optical anisotropic film, and the absorption peak of the additive is disclosed as follows. It is described that it is preferably in the range of 250 nm to 400 nm. In the examples, compounds having an oxadiazole ring as an aromatic heterocycle are described.
- Patent Document 8 a compound containing at least two sites in which an aromatic heterocyclic group and an aromatic hydrocarbon group are connected by a single bond is added to the cellulose compound, A technique for expressing in-plane retardation with low retardation in the film thickness direction is disclosed.
- 5-membered or 6-membered aromatic heterocycle is preferable, and exemplary compounds such as oxadiazole, isoxadiazole, thiadiazole, and isothiadiazole are described.
- a compound in which two isoxadiazole rings are bonded via a phenylene group is described.
- Patent Documents 7 and 8 do not describe the interaction between the resin and the additive, and do not suggest the CH / ⁇ interaction that is the technical idea of the present application.
- the purpose and effect are also completely different from those of the present application. That is, even if the compounds described in these patent documents happen to have a plurality of 5-membered aromatic heterocycles and 6-membered aromatic rings, their CH / ⁇ interaction Unless the intention of using water is to strengthen the interaction between the resin and the additive and to suppress the invasion of water molecules between the water-adsorbing resin and the additive in the presence of water molecules is specified. It should be distinguished from the present invention, and no disclosure of such a technical idea has been found in our scrutiny.
- the compounds described in Examples of Patent Documents 7 and 8 have an oxadiazole ring or an isoxadiazole ring as a 5-membered aromatic heterocyclic ring.
- the NICS value of the oxadiazole ring is -10.74
- the isoxadiazole ring is -11.51
- the pyrrole ring -14.86
- the imidazole ring -13.85.
- the technical idea is completely different from that of the present invention.
- rings such as an oxadiazole ring, isoxadiazole ring, thiadiazole ring, isothiadiazole ring, and the like are hydroxy groups (—OH) and amino groups that many water adsorbent resins have. It is an unstable ring structure that can react with (—NH 2 ) or be hydrolyzed by water molecules.
- the following reactions are described in Chem. Ber. 1892, 25, 1585, J.A. Org. Chem. 2005, 70, 2322-2324 and Tetrahedron, 2012, 68, 4814-4819.
- the compounds described in Patent Documents 7 and 8 are compounds having a structure that easily causes reaction, decomposition, etc. in the coexistence with a water-adsorbing resin. It is not suitable, and is less effective for suppressing fluctuations in optical characteristics, which is an object effect of the present invention.
- the resin composition of the present invention contains a water-adsorbing resin.
- a water-adsorbing resin is a resin that absorbs water according to the passage of time or changes in the external humidity environment. Therefore, dimensional changes, mechanical characteristics such as rigidity and strength, electrical characteristics such as resistivity, It is a resin having a problem that changes in properties such as optical properties such as refractive index occur.
- Water-adsorbing resins include acrylic resin (polymethyl methacrylate, etc.), polyester (polyethylene terephthalate, etc.), polyamide (nylon, etc.), polycarbonate, cellophane, cellulose derivatives (cellulose acetate, ethyl cellulose, etc.), polyvinyl alcohol, polyacetic acid Examples thereof include vinyl, polyvinyl formal, polyvinyl acetal, polyvinyl formal, polyimide, urea resin, phenol resin, and melamine resin.
- the water adsorbent resin in the present invention has a water absorption rate of 0.1% or more.
- the addition of the additive of the present invention to such a resin is preferable because fluctuations in optical properties can be suppressed.
- the water absorption is more preferably 0.5 to 10%.
- the water-adsorbing resin is preferably a cellulose derivative because it is excellent in the effect of suppressing fluctuations in optical properties.
- a cellulose ester having an acyl group is preferable.
- the water absorption rate in the present invention represents the rate of weight increase after immersing the water-adsorbing resin in 23 ° C. water for 24 hours.
- a film prepared from a water-adsorbing resin is measured for the weight of the film after being left in a room conditioned at 23 ° C. and 55% RH for 4 hours or longer, and this is defined as W1.
- W1 weight of the film after being left in a room conditioned at 23 ° C. and 55% RH for 4 hours or longer
- W2 mass of the film taken out
- W2 mass of the film taken out
- the resin composition of the present invention is a resin composition containing at least a resin and an additive N.
- the resin can also be used as a substrate and an optical lens of the optical film of the present invention.
- the optical film refers to a functional film used for various display devices such as a liquid crystal display, a plasma display, and an organic EL display. Specifically, a polarizing plate protective film, a retardation film, an antireflection film, and a brightness enhancement film. , Hard coat films, antiglare films, antistatic films, optical compensation films such as viewing angle expansion, and the like.
- the resin constituting the resin composition preferably has a polar group.
- the polar group in this resin, water, and a 5-membered or 6-membered aromatic hydrocarbon ring or aromatic heterocycle have a strong interaction, and maintain the orientation even when the amount of water molecules in the optical film changes. It is estimated that the fluctuation of the phase value can be suppressed.
- the polar group is not particularly limited as long as it is an organic group that is polarized by atoms having high electronegativity such as oxygen, nitrogen, sulfur, and halogen.
- the resin having a polar group include a hydroxy group, a carbonyl group, a urethane group, an isocyanurate group, a urea group, a carbonate group, an amide group, an ester group, a carboxy group, an acid anhydride group, an ether group, an epoxy group, and an imino group. Or resin which has an amino group etc. is mentioned.
- cellulose derivatives such as cellulose ester resins and cellulose ether resins are preferred.
- a cellulose derivative and the above resin can be used in combination.
- the resin used in combination is preferably a polycarbonate resin, an acrylic resin, or a cyclic olefin resin.
- the resin content other than the cellulose derivative is preferably in the range of 0 to 50% by mass.
- a cellulose derivative is a compound (compound having a cellulose skeleton) using cellulose as a raw material.
- cellulose derivatives include cellulose ether (eg, methyl cellulose, ethyl cellulose, hydroxyethyl cellulose, hydroxypropyl cellulose, cyanoethyl cellulose, etc.), cellulose ester (details will be described later), cellulose ether ester (eg, acetyl methyl cellulose, acetyl ethyl cellulose, acetyl hydroxy).
- Resins such as ethyl cellulose, benzoylhydroxypropyl cellulose, etc., cellulose carbonate (eg, cellulose ethyl carbonate, etc.), cellulose carbamate (eg, cellulose phenyl carbamate, etc.) are included, and cellulose esters are preferred.
- the cellulose derivative may be one type or a mixture of two or more types.
- the cellulose ester is a compound obtained by esterifying cellulose and at least one of an aliphatic carboxylic acid and an aromatic carboxylic acid having about 2 to 22 carbon atoms, preferably cellulose and a lower carbon number of 6 or less. It is a compound obtained by esterifying a fatty acid.
- the acyl group contained in the cellulose ester may be linear or branched, may form a ring, and may further have another substituent.
- the acyl group preferably has 2 to 6 carbon atoms, more preferably 2 to 4 carbon atoms, and still more preferably 2 to 3 carbon atoms.
- cellulose esters include cellulose acetate, and mixed fatty acid esters such as cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate propionate butyrate, or cellulose acetate phthalate.
- Preferred is cellulose acetate, cellulose acetate butyrate or cellulose acetate propionate.
- the butyryl group that can be contained in the cellulose ester may be linear or branched.
- the total substitution degree of the acyl group of the cellulose ester can be about 1.0 to 3.0.
- the total substitution degree of the acyl group is preferably in the range of 2.0 to 2.95 from the viewpoint of reducing moisture permeability.
- substitution degree of the acyl group of the cellulose ester can be measured by a method prescribed in ASTM D817-96.
- the number average molecular weight of the cellulose derivative is preferably in the range of 6 ⁇ 10 4 to 3 ⁇ 10 5 in order to increase the mechanical strength of the resulting film, and the molecular weight is in the range of 7 ⁇ 10 4 to 2 ⁇ 10 5 . It is more preferable that
- the weight average molecular weight (Mw) and number average molecular weight (Mn) of the cellulose derivative are measured using gel permeation chromatography (GPC).
- the measurement conditions are as follows.
- the content of residual sulfuric acid in the cellulose derivative is preferably in the range of 0.1 to 45 ppm by mass in terms of elemental sulfur, and more preferably in the range of 1 to 30 ppm by mass. Sulfuric acid is considered to remain in the film in a salt state. When the content of the residual sulfuric acid exceeds 45 ppm by mass, the film tends to break when the film is stretched hot or when slitting is performed after the hot stretch.
- the content of residual sulfuric acid can be measured by the method prescribed in ASTM D817-96.
- the content of free acid in the cellulose derivative is preferably in the range of 1 to 500 ppm by mass, more preferably 1 to 100 ppm by mass, and further preferably in the range of 1 to 70 ppm by mass. preferable.
- the content of free acid can be measured by the method prescribed in ASTM D817-96.
- Cellulose derivatives may contain trace amounts of metal components. It is thought that a trace amount metal component originates in the water used in the synthesis process of the cellulose derivative. Like these metal components, the content of components that can become insoluble nuclei is preferably as small as possible.
- metal ions such as iron, calcium, and magnesium may form an insoluble matter by forming a salt with a resin decomposition product or the like that may contain an organic acidic group.
- the calcium (Ca) component easily forms a coordination compound (that is, a complex) with an acidic component such as a carboxylic acid or a sulfonic acid, and many ligands. Insoluble starch, turbidity) may be formed.
- the content of the iron (Fe) component in the cellulose derivative is preferably 1 mass ppm or less.
- the content of the calcium (Ca) component in the cellulose derivative is preferably 60 ppm by mass or less, and more preferably in the range of 0 to 30 ppm by mass.
- the content of the magnesium (Mg) component in the cellulose derivative is preferably in the range of 0 to 70 ppm by mass, and particularly preferably in the range of 0 to 20 ppm by mass.
- the content of metal components such as iron (Fe) component, calcium (Ca) component, and magnesium (Mg) component is pretreated by microdigest wet decomposition device (sulfuric acid decomposition) and alkali melting After the measurement, it can be measured using ICP-AES (Inductively Coupled Plasma Atomic Emission Spectrometer).
- microdigest wet decomposition device sulfuric acid decomposition
- alkali melting After the measurement, it can be measured using ICP-AES (Inductively Coupled Plasma Atomic Emission Spectrometer).
- the contents of residual alkaline earth metal, residual sulfuric acid and residual acid can be adjusted by thoroughly washing the cellulose derivative obtained by synthesis.
- the cellulose derivative can be produced by a known method. Specifically, for example, it can be synthesized with reference to the method described in JP-A-10-45804.
- the cellulose as a raw material for the cellulose derivative is not particularly limited, and may be cotton linter, wood pulp, kenaf, and the like. You may mix and use the cellulose derivative from which a raw material differs.
- the (meth) acrylic resin that can be used in the present invention can be a homopolymer of a (meth) acrylic acid ester or a copolymer of a (meth) acrylic acid ester and another copolymerizable monomer.
- the (meth) acrylic resin may be one type or a mixture of two or more types.
- the (meth) acrylic acid ester is preferably methyl methacrylate.
- the content ratio of the structural unit derived from methyl methacrylate in the copolymer is preferably 50% by mass or more, and more preferably 70% by mass or more.
- Examples of the copolymerization monomer that forms a copolymer with methyl methacrylate include alkyl methacrylates having 2 to 18 carbon atoms in the alkyl portion; alkyl acrylates having 1 to 18 carbon atoms in the alkyl portion; Obtained alkyl (meth) acrylates having 1 to 18 carbon atoms in the alkyl moiety having a hydroxy group; ⁇ , ⁇ -unsaturated acids such as acrylic acid and methacrylic acid; unsaturated groups such as maleic acid, fumaric acid and itaconic acid Containing divalent carboxylic acids; aromatic vinyl compounds such as styrene and ⁇ -methylstyrene; ⁇ , ⁇ -unsaturated nitriles such as acrylonitrile and methacrylonitrile; maleic anhydride, maleimide, N-substituted maleimide, glutaric anhydride, Acrylamide derivatives such as acryloylmorpholine (ACMO
- alkyl acrylates such as methyl acrylate, ethyl acrylate, n-propyl acrylate, n-butyl acrylate, s-butyl acrylate, and 2-ethylhexyl acrylate;
- Alkyl (meth) acrylates having a hydroxy group such as methyl (hydroxymethyl) acrylate and ethyl 2- (hydroxymethyl) acrylate are preferred.
- acryloylmorpholine and the like are preferable.
- the (meth) acrylic resin preferably contains a lactone ring structure from the viewpoint of enhancing the heat resistance of the obtained optical film or adjusting the photoelastic coefficient.
- the lactone ring structure contained in the (meth) acrylic resin is preferably represented by the following general formula (3).
- R 1 to R 3 each independently represents a hydrogen atom or an organic residue having 1 to 20 carbon atoms.
- the organic residue may contain an oxygen atom.
- Examples of organic residues include linear or branched alkyl groups, linear or branched alkylene groups, aromatic hydrocarbon ring groups, —OAc groups (Ac is an acetyl group), —CN groups, and the like. .
- the lactone ring structure represented by the general formula (3) is a structure derived from an alkyl (meth) acrylate having a hydroxy group, as will be described later.
- the (meth) acrylic resin containing a lactone ring structure further includes a structural unit derived from an alkyl (meth) acrylate having an alkyl moiety having 1 to 18 carbon atoms, and optionally contains a monomer containing a hydroxy group, unsaturated
- a structural unit derived from a carboxylic acid, a monomer represented by the following general formula (4), or the like may be further included.
- R 4 in the general formula (4) represents a hydrogen atom or a methyl group.
- X is a hydrogen atom, an alkyl group having 1 to 20 carbon atoms, an aromatic hydrocarbon ring group, —OAc group (Ac is an acetyl group), —CN group, acyl group, or —C—OR group (R is a hydrogen atom or Represents an organic residue having 1 to 20 carbon atoms.
- the content ratio of the lactone ring structure represented by the general formula (1) in the (meth) acrylic resin containing a lactone ring structure is preferably in the range of 5 to 90% by mass, more preferably 10 to 80% by mass. %, More preferably in the range of 15 to 70% by mass.
- the content of the lactone ring structure is 5% by mass or more, a film having a necessary retardation is easily obtained, and the heat resistance, solvent resistance, and surface hardness of the film are sufficient.
- the content of the lactone ring structure is 90% by mass or less, the moldability is high, and the flexibility of the obtained film tends to be high.
- the content of the structural unit derived from the alkyl (meth) acrylate is preferably in the range of 10 to 95% by mass, more preferably 20 to 90% by mass. Within the range, more preferably within the range of 30 to 85% by mass.
- the content ratio of the structural unit derived from the hydroxy group-containing monomer, the unsaturated carboxylic acid, or the monomer represented by the general formula (2) is preferably 0 independently. It is in the range of ⁇ 30% by mass, more preferably in the range of 0-20% by mass, and still more preferably in the range of 0-10% by mass.
- a (meth) acrylic resin containing a lactone ring structure is polymerized by a monomer component containing at least an alkyl (meth) acrylate having a hydroxy group and another alkyl (meth) acrylate to form a hydroxy group in the molecular chain. It can be produced through a step of obtaining a polymer having a group and an ester group, and a step of introducing a lactone ring structure by heat-treating the obtained polymer.
- the weight average molecular weight Mw of the (meth) acrylic resin is preferably in the range of 8.0 ⁇ 10 4 to 5.0 ⁇ 10 5 , more preferably 9.0 ⁇ 10 4 to 4.5 ⁇ 10 5 . Within the range, more preferably within the range of 1.0 ⁇ 10 5 to 4.0 ⁇ 10 5 . If the weight average molecular weight Mw of the (meth) acrylic resin is 8.0 ⁇ 10 4 or more, the brittleness resistance of the film is easily improved, and if it is 5.0 ⁇ 10 5 or less, the haze of the film tends to be low.
- the weight average molecular weight Mw of the (meth) acrylic resin can be measured by gel permeation chromatography in the same manner as the method for measuring the weight average molecular weight Mw of the cellulose ester.
- optical film of the present invention may further contain the following various additives as required.
- the optical film of the present invention can contain a sugar ester other than the cellulose ester described above from the viewpoint of improving the plasticity of the optical film.
- the sugar ester that can be used in the present invention refers to a compound having 1 to 12 furanose structures or pyranose structures in which all or part of the hydroxy groups in the compound are esterified.
- sugar esters represented by the following general formula (FA).
- R 1 to R 8 in formula (FA) each independently represent a hydrogen atom, a substituted or unsubstituted alkylcarbonyl group, or a substituted or unsubstituted arylcarbonyl group.
- R 1 to R 8 may be the same as or different from each other.
- the substituted or unsubstituted alkylcarbonyl group is preferably a substituted or unsubstituted alkylcarbonyl group having 2 or more carbon atoms.
- Examples of the substituted or unsubstituted alkylcarbonyl group include a methylcarbonyl group (acetyl group).
- the substituted or unsubstituted arylcarbonyl group is preferably a substituted or unsubstituted arylcarbonyl group having 7 or more carbon atoms.
- the arylcarbonyl group include a phenylcarbonyl group.
- the substituent that the aromatic hydrocarbon ring group has include an alkyl group such as a methyl group, an alkoxyl group such as a methoxy group, and the like.
- the average substitution degree of the acyl group of the sucrose ester is preferably in the range of 3.0 to 7.5. When the average substitution degree of the acyl group is within this range, sufficient compatibility with the cellulose ester is easily obtained.
- sucrose ester represented by the general formula (FA) include the following exemplified compounds FA-1 to FA-24.
- the following table shows the average substitution degree of R 1 to R 8 in the general formula (FA) of the exemplary compounds FA-1 to FA-24 and the acyl group.
- sugar esters examples include compounds described in JP-A Nos. 62-42996 and 10-237084.
- the content of the sugar ester is preferably in the range of 0.5 to 35.0% by mass, more preferably in the range of 5.0 to 30.0% by mass with respect to the cellulose ester.
- the optical film of the present invention may contain a plasticizer in order to improve the fluidity of the composition during film production and the flexibility of the film.
- plasticizers include polyester plasticizers, polyhydric alcohol ester plasticizers, polycarboxylic acid ester plasticizers (including phthalate ester plasticizers), glycolate plasticizers, ester plasticizers ( Citrate ester plasticizers, fatty acid ester plasticizers, phosphate ester plasticizers, trimellitic ester plasticizers, and the like). These may be used alone or in combination of two or more.
- the polyester plasticizer is a compound obtained by reacting a monovalent to tetravalent carboxylic acid and a monovalent to hexavalent alcohol, and preferably a compound obtained by reacting a divalent carboxylic acid and a glycol. It is.
- divalent carboxylic acid examples include succinic acid, glutaric acid, itaconic acid, adipic acid, phthalic acid, azelaic acid, sebacic acid and the like.
- a compound using succinic acid, adipic acid, phthalic acid or the like as the divalent carboxylic acid can impart good plasticity.
- glycols examples include ethylene glycol, propylene glycol, 1,3-butylene glycol, 1,4-butylene glycol, 1,6-hexamethylene glycol, neopentylene glycol, diethylene glycol, triethylene glycol, dipropylene glycol and the like. included.
- One type of divalent carboxylic acid and glycol may be used, respectively, or two or more types may be used in combination.
- the polyester plasticizer may be any of ester, oligoester and polyester.
- the molecular weight of the polyester plasticizer is preferably in the range of 100 to 10,000, and more preferably in the range of 600 to 3,000 because the effect of imparting plasticity is great.
- the viscosity of the polyester plasticizer depends on the molecular structure and molecular weight. However, in the case of an adipic acid plasticizer, the compatibility with the cellulose ester is high and the effect of imparting plasticity is high. It is preferably in the range of s (25 ° C.).
- One type of polyester plasticizer may be used, or two or more types may be used in combination.
- the polyhydric alcohol ester plasticizer is an ester compound (alcohol ester) of a dihydric or higher aliphatic polyhydric alcohol and a monocarboxylic acid, preferably a divalent to 20-valent aliphatic polyhydric alcohol ester.
- the polyhydric alcohol ester compound preferably has an aromatic ring or a cycloalkyl ring in the molecule.
- aliphatic polyhydric alcohol examples include ethylene glycol, propylene glycol, trimethylolpropane, pentaerythritol and the like.
- the monocarboxylic acid can be an aliphatic monocarboxylic acid, an alicyclic monocarboxylic acid, an aromatic monocarboxylic acid, or the like.
- One kind of monocarboxylic acid may be used, or a mixture of two or more kinds may be used.
- all of the OH groups contained in the aliphatic polyhydric alcohol may be esterified, or a part of the OH groups may be left as they are.
- the aliphatic monocarboxylic acid is preferably a fatty acid having a straight chain or a side chain having 1 to 32 carbon atoms.
- the number of carbon atoms of the aliphatic monocarboxylic acid is more preferably 1-20, and still more preferably 1-10.
- Examples of such aliphatic monocarboxylic acids include acetic acid, propionic acid, butyric acid, valeric acid, and the like, and acetic acid may be preferable in order to enhance compatibility with the cellulose ester.
- Examples of the alicyclic monocarboxylic acid include cyclopentane carboxylic acid, cyclohexane carboxylic acid, cyclooctane carboxylic acid and the like.
- aromatic monocarboxylic acids examples include benzoic acid; one having 1 to 3 alkyl groups or alkoxy groups (for example, methoxy group or ethoxy group) introduced into the benzene ring of benzoic acid (for example, toluic acid, etc.); benzene ring Aromatic monocarboxylic acids having two or more (for example, biphenyl carboxylic acid, naphthalene carboxylic acid, tetralin carboxylic acid, etc.) are included, and benzoic acid is preferred.
- the molecular weight of the polyhydric alcohol ester plasticizer is not particularly limited, but is preferably in the range of 300 to 1500, and more preferably in the range of 350 to 750. In order to make it hard to volatilize, the one where molecular weight is larger is preferable. In order to improve moisture permeability and compatibility with the cellulose ester, a smaller molecular weight is preferable.
- polyhydric alcohol ester plasticizer examples include trimethylolpropane triacetate, pentaerythritol tetraacetate, ester compound (A) represented by general formula (I) described in JP-A-2008-88292, and the like. It is.
- the polyvalent carboxylic acid ester plasticizer is an ester compound of a divalent or higher, preferably 2 to 20 valent polycarboxylic acid and an alcohol compound.
- the polyvalent carboxylic acid is preferably a 2-20 valent aliphatic polyvalent carboxylic acid, a 3-20 valent aromatic polyvalent carboxylic acid, or a 3-20 valent alicyclic polyvalent carboxylic acid.
- polyvalent carboxylic acids include trivalent or higher aromatic polyvalent carboxylic acids such as trimellitic acid, trimesic acid, pyromellitic acid or derivatives thereof; succinic acid, adipic acid, azelaic acid, sebacic acid, oxalic acid Contains aliphatic polycarboxylic acids such as fumaric acid, maleic acid and tetrahydrophthalic acid; oxypolycarboxylic acids such as tartaric acid, tartronic acid, malic acid and citric acid, etc., and suppresses volatilization from the film. For this, oxypolycarboxylic acids are preferred.
- the alcohol compound examples include an aliphatic saturated alcohol compound having a straight chain or a side chain, an aliphatic unsaturated alcohol compound having a straight chain or a side chain, an alicyclic alcohol compound, or an aromatic alcohol compound.
- the carbon number of the aliphatic saturated alcohol compound or the aliphatic unsaturated alcohol compound is preferably 1 to 32, more preferably 1 to 20, and further preferably 1 to 10.
- Examples of the alicyclic alcohol compound include cyclopentanol, cyclohexanol and the like.
- the aromatic alcohol compound include phenol, paracresol, dimethylphenol, benzyl alcohol, cinnamyl alcohol and the like.
- the alcohol compound may be one kind or a mixture of two or more kinds.
- the molecular weight of the polyvalent carboxylic acid ester plasticizer is not particularly limited, but is preferably in the range of 300 to 1000, and more preferably in the range of 350 to 750. A larger molecular weight of the polyvalent carboxylic acid ester plasticizer is preferable from the viewpoint of suppressing bleeding out. From the viewpoint of moisture permeability and compatibility with cellulose ester, a smaller one is preferable.
- the acid value of the polyvalent carboxylic acid ester plasticizer is preferably 1 mgKOH / g or less, more preferably 0.2 mgKOH / g or less.
- the acid value refers to the number of milligrams of potassium hydroxide necessary for neutralizing the acid (carboxy group present in the sample) contained in 1 g of the sample. The acid value is measured according to JIS K0070.
- polycarboxylic acid ester plasticizer examples include an ester compound (B) represented by the general formula (II) described in JP-A-2008-88292.
- the polycarboxylic acid ester plasticizer may be a phthalate ester plasticizer.
- the phthalate ester plasticizer include diethyl phthalate, dimethoxyethyl phthalate, dimethyl phthalate, dioctyl phthalate, dibutyl phthalate, di-2-ethylhexyl phthalate, dicyclohexyl phthalate, dicyclohexyl terephthalate and the like.
- glycolate plasticizers include alkylphthalyl alkyl glycolates.
- alkyl phthalyl alkyl glycolates include methyl phthalyl methyl glycolate, ethyl phthalyl ethyl glycolate, propyl phthalyl propyl glycolate, butyl phthalyl butyl glycolate, octyl phthalyl octyl glycolate and the like. .
- the ester plasticizer includes a fatty acid ester plasticizer, a citrate ester plasticizer, a phosphate ester plasticizer, a trimellitic acid plasticizer, and the like.
- Examples of the fatty acid ester plasticizer include butyl oleate, methylacetyl ricinoleate, dibutyl sebacate and the like.
- Examples of the citrate plasticizer include acetyl trimethyl citrate, acetyl triethyl citrate, acetyl tributyl citrate and the like.
- Examples of the phosphate ester plasticizer include triphenyl phosphate, tricresyl phosphate, cresyl diphenyl phosphate, octyl diphenyl phosphate, diphenyl biphenyl phosphate, trioctyl phosphate, tributyl phosphate and the like.
- trimellitic acid plasticizers include octyl trimellitic acid, n-octyl trimellitic acid, isodecyl trimellitic acid, and isononyl trimellitic acid.
- the plasticizer content is preferably in the range of 0.5 to 30.0% by mass with respect to the cellulose ester. If the content of the plasticizer is 30.0% by mass or less, the optical film hardly causes bleed out.
- the optical film of the present invention may further contain an ultraviolet absorber.
- the ultraviolet absorber may be benzotriazole, 2-hydroxybenzophenone, salicylic acid phenyl ester, or the like.
- an ultraviolet absorber having a molecular weight of 400 or more is difficult to volatilize at a high boiling point, and is difficult to scatter even at high temperature molding. Therefore, even if the addition amount is relatively small, weather resistance is imparted to the obtained film. Can do.
- ultraviolet absorbers having a molecular weight of 400 or more examples include 2- [2-hydroxy-3,5-bis ( ⁇ , ⁇ -dimethylbenzyl) phenyl] -2-benzotriazole, 2,2-methylenebis [4- Benzotriazoles such as (1,1,3,3-tetrabutyl) -6- (2H-benzotriazol-2-yl) phenol]; Hindered amines such as bis (2,2,6,6-tetramethyl-4-piperidyl) sebacate, bis (1,2,2,6,6-pentamethyl-4-piperidyl) sebacate; 2- (3,5-di-t-butyl-4-hydroxybenzyl) -2-n-butylmalonate bis (1,2,2,6,6-pentamethyl-4-piperidyl), 1- [2- [3- (3,5-di-tert-butyl-4-hydroxyphenyl) propionyloxy] ethyl] -4- [3- (3,5-di
- the optical film of the present invention may contain fine particles composed of an inorganic compound or an organic compound.
- inorganic compounds include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, calcium carbonate, talc, clay, calcined kaolin, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, magnesium silicate , Calcium phosphate and the like.
- organic compounds include polytetrafluoroethylene, cellulose acetate, polystyrene, polymethyl methacrylate, polypropyl methacrylate, polymethyl acrylate, polyethylene carbonate, acrylic styrene resin, silicone resin, polycarbonate resin, benzoguanamine resin, melamine Resin, polyolefin-based powder, polyester-based resin, polyamide-based resin, polyimide-based resin, pulverized classification of organic polymer compound (polyfluorinated ethylene-based resin, starch, etc.), polymer compound synthesized by suspension polymerization method, spray drying High molecular compounds made spherical by the method or dispersion method are included.
- the fine particles can be composed of a compound containing silicon, preferably silicon dioxide, from the viewpoint that the haze of the obtained film can be kept low.
- silicon dioxide fine particles examples include Aerosil R972, R972V, R974, R812, 200, 200V, 300, R202, OX50, TT600 (above, Nippon Aerosil Co., Ltd.) and the like.
- Aerosil 200V and Aerosil R972V are particularly preferable because they can improve the slipperiness of the film surface while keeping the haze of the optical film low.
- zirconium oxide fine particles examples include Aerosil R976, R811 (manufactured by Nippon Aerosil Co., Ltd.) and the like.
- the polymer compound examples include a silicone resin, a fluororesin, a (meth) acrylic resin, and the like, preferably a silicone resin, and more preferably a silicone resin having a three-dimensional network structure.
- silicone resins include Tospearl 103, 105, 108, 120, 145, 3120, 240 (above, manufactured by Toshiba Silicone Co., Ltd.) and the like.
- the average primary particle size of the fine particles is preferably in the range of 5 to 400 nm, more preferably in the range of 10 to 300 nm.
- the fine particles may form secondary aggregates mainly having a particle size in the range of 0.05 to 0.30 ⁇ m. If the average particle size of the fine particles is in the range of 100 to 400 nm, they can exist as primary particles without agglomeration.
- the dynamic friction coefficient of at least one surface of the optical film is in the range of 0.2 to 1.0.
- the content of the fine particles is preferably in the range of 0.01 to 1.00% by mass, more preferably in the range of 0.05 to 0.50% by mass with respect to the cellulose ester.
- the optical film of the present invention may further contain a dispersant from the viewpoint of enhancing the dispersibility of the fine particles.
- the dispersant is one or more selected from amine-based dispersants and carboxy group-containing polymer dispersants.
- the amine dispersant is preferably an alkylamine or an amine salt of polycarboxylic acid, and specific examples thereof include polyester acid, polyether ester acid, fatty acid, fatty acid amide, polycarboxylic acid, alkylene oxide, polyalkylene oxide. , A compound obtained by aminating polyoxyethylene fatty acid ester, polyoxyethylene glycerin fatty acid ester, and the like.
- amine salts include amidoamine salts, aliphatic amine salts, aromatic amine salts, alkanolamine salts, polyvalent amine salts and the like.
- amine dispersant examples include polyoxyethylene fatty acid amide, polyoxyethylene alkylamine, tripropylamine, diethylaminoethylamine, dimethylaminopropylamine, diethylaminopropylamine and the like.
- examples of commercially available products include Solspers series (manufactured by Lubrizol), Ajisper series (manufactured by Ajinomoto Co., Inc.), BYK series (manufactured by Big Chemie), EFKA series (manufactured by EFKA), and the like.
- the carboxy group-containing polymer dispersant is preferably a polycarboxylic acid or a salt thereof, and may be, for example, polycarboxylic acid, ammonium polycarboxylate, sodium polycarboxylate, or the like.
- Specific examples of the carboxy group-containing polymer dispersant include polyacrylic acid, ammonium polyacrylate, sodium polyacrylate, ammonium polyacrylate copolymer, polymaleic acid, ammonium polymaleate, sodium polymaleate and the like.
- the amine-based dispersant and the carboxy group-containing polymer dispersant may be used after being dissolved in a solvent component, or may be commercially available.
- the content of the dispersant is preferably 0.2% by mass or more based on the fine particles, although it depends on the type of the dispersant. When the content of the dispersant is 0.2% by mass or more with respect to the fine particles, the dispersibility of the fine particles can be sufficiently improved.
- the optical film of the present invention further contains a surfactant or the like, adsorption of the dispersant to the surface of the fine particles is less likely to occur than the surfactant, and the fine particles may be easily re-aggregated. Since the dispersant is expensive, its content is preferably as small as possible. On the other hand, when the content of the dispersant is too small, poor wettability of fine particles and a decrease in dispersion stability are likely to occur. Therefore, when the optical film of the present invention further contains a surfactant or the like, the content of the dispersant can be about 0.05 to 10.00 parts by mass with respect to 10.00 parts by mass of the fine particles.
- Phase difference control agent In order to improve the display quality of an image display device such as a liquid crystal display device, a retardation control agent is added to the optical film or an alignment film is formed to provide a liquid crystal layer. By combining the phase difference, the optical compensation ability can be imparted to the optical film.
- Examples of the retardation control agent include aromatic compounds having two or more aromatic rings as described in EP 911,656A2, and rod-like compounds described in JP-A-2006-2025. It is done. Two or more aromatic compounds may be used in combination.
- the aromatic ring of the aromatic compound is preferably an aromatic heterocyclic ring including an aromatic heterocyclic ring in addition to the aromatic hydrocarbon ring.
- the aromatic heterocycle is generally an unsaturated heterocycle. Of these, the 1,3,5-triazine ring described in JP-A-2006-2026 is preferable.
- the compound represented by the general formula (1) also functions as a phase difference controlling agent. For this reason, the compound represented by the general formula (1) can provide both functions of phase difference control and suppression of optical value fluctuation against humidity fluctuation with a single compound.
- the addition amount of these retardation control agents is preferably in the range of 0.5 to 20% by mass, preferably in the range of 1 to 10% by mass, with respect to 100% by mass of the resin used as the film substrate. More preferably.
- the optical film of the present invention may further contain an antioxidant, an antistatic agent, a flame retardant and the like for preventing thermal decomposition during molding and coloring due to heat.
- Phosphorus flame retardants include red phosphorus, triaryl phosphate ester, diaryl phosphate ester, monoaryl phosphate ester, aryl phosphonate compound, aryl phosphine oxide compound, condensed aryl phosphate ester, halogenated alkyl phosphate ester, One or more kinds selected from halogen condensed phosphoric acid esters, halogen-containing condensed phosphonic acid esters, halogen-containing phosphorous acid esters and the like can be mentioned.
- triphenyl phosphate 9,10-dihydro-9-oxa-10-phosphaphenanthrene-10-oxide, phenylphosphonic acid, tris ( ⁇ -chloroethyl) phosphate, tris (dichloropropyl) phosphate. , Tris (tribromoneopentyl) phosphate, and the like.
- the optical film of the present invention can be used as an optical film for image display devices such as organic EL display devices and liquid crystal display devices.
- the optical film of the present invention is preferably used for a polarizing plate protective film, a retardation film, and an optical compensation film. It is preferable that the retardation film or the optical compensation film also serves as a polarizing plate protective film.
- the ⁇ / 4 retardation film has an in-plane retardation value Ro of about 1 ⁇ 4 of a predetermined light wavelength (usually visible light region).
- the ⁇ / 4 retardation film is preferably composed of a single layer of the optical film of the present invention.
- the ⁇ / 4 retardation film is preferably used for an antireflection film of an organic EL display device.
- the retardation value of the optical film of the present invention is not particularly limited and can be appropriately adjusted according to the use of the optical film.
- the optical film of the present invention is used as an optical compensation film for a vertical alignment type liquid crystal display device, it is preferable for the viewing angle expansion that the retardation value satisfies the following conditions 1 and 2.
- An in-plane retardation value Ro (590) represented by the following formula (I) measured at a wavelength of 590 nm under an environment of a temperature of 23 ° C. and a relative humidity of 55% is in the range of 40 to 100 nm.
- Rt ⁇ (n x + ny ) / 2 ⁇ n z ⁇ ⁇ d (Here, the refractive index in the slow axis direction in the plane n x of the film, the direction of the refractive index n y perpendicular to the slow axis in the plane of the film, the refractive index in the thickness direction of the film n z D represents the thickness (nm) of the film.)
- the desired retardation can be adjusted by controlling the draw ratio at the time of film production, the addition amount of the retardation increasing agent, the type and substitution degree of the acyl group of the cellulose ester, the film thickness of the film, and the like.
- the optical film of the present invention When the optical film of the present invention is used as a ⁇ / 4 retardation film for antireflection of an organic EL display device, a surface measured at wavelengths of 450 nm, 550 nm, and 650 nm under conditions of a temperature of 23 ° C. and a relative humidity of 55%.
- the inward phase difference value Ro is Ro (450), Ro (550), and Ro (650), respectively, the Ro (450), Ro (550), and Ro (650) are represented by the following formula (a1). It is preferable to satisfy (a3).
- An optical film in which Ro (550) satisfies the formula (a1) can preferably function as a ⁇ / 4 retardation film. Especially, it is more preferable to satisfy
- An optical film in which Ro (450), Ro (550) and Ro (650) satisfy the above formulas (a2) and (a3) is excellent in reverse wavelength dispersion and can function more preferably as a ⁇ / 4 retardation film. .
- light leakage or the like when an image display device using an optical film is displayed in black can be reduced.
- the formula (a2) is satisfied, the blue reproducibility is high, and when the formula (a3) is satisfied, the red reproducibility is high.
- the optical film of the present invention has a thickness direction retardation value Rt measured at a wavelength of 550 nm under the conditions of 23 ° C. and 55% RH, where Rt (550) is Rt (550), It is preferable to satisfy 50 nm ⁇ Rt (550) ⁇ 250 nm.
- Desired retardation can be adjusted by controlling the draw ratio at the time of film production, the amount of addition of the retardation increasing agent, the type and substitution degree of the acyl group of the cellulose ester, the film thickness, and the like.
- N z defined by the following formula (a4) preferably satisfies the following formula (a5).
- N z Rt (550) / Ro (550) +0.5 (A5) 0 ⁇ N z ⁇ 1 If N z satisfies the formula (a5), the retardation value Rt in the thickness direction is relatively smaller than the retardation value Ro in the in-plane direction, so that the image display device including the optical film of the present invention is inclined. The change in color when observed from the direction can be reduced.
- the angle formed by the slow axis in the plane of the optical film and the film transport direction is preferably in the range of 40 to 50 °.
- the orientation angle is within the above range, the film is unwound from the roll body, and is unwound from the roll body with an optical film having a slow axis in an oblique direction with respect to the long direction (conveying direction).
- a circularly polarizing plate can be easily manufactured by laminating a polarizing film having an absorption axis parallel to the (conveying direction) with a roll-to-roll so that the longitudinal directions overlap each other. Can do. There is little cut loss of the film, which is advantageous in production.
- the orientation angle of the optical film can be measured with an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments).
- the above Ro and Rt can be measured using an automatic birefringence meter, for example, AxoScan manufactured by Axometric, and KOBRA-21ADH manufactured by Oji Scientific Instruments.
- AxoScan specifically, it can be measured by the following method.
- 550) and Ro (650) are measured with an AxoScan. The measurement is performed under conditions of 23 ° C. and 55% RH.
- the film thickness of the optical film is preferably in the range of 10 to 100 ⁇ m from the viewpoint of thinning the display device and productivity. If the film thickness is 10 ⁇ m or more, a certain level of film strength and retardation can be expressed. If the film thickness is 100 ⁇ m or less, fluctuations in phase difference due to heat and humidity can be suppressed. Preferably, it is in the range of 20 to 70 ⁇ m.
- the film thickness unevenness of the optical film of the present invention is preferably in the range of 0 to 5 ⁇ m, more preferably in the range of 0 to 3 ⁇ m, and still more preferably in the range of 0 to 2 ⁇ m in both the thickness direction and the width direction. It is.
- the haze (total haze) of the optical film is preferably less than 1%, more preferably 0.5% or less, and even more preferably 0.2% or less. If the haze is less than 1%, the transparency of the film does not decrease and the film functions sufficiently as an optical film.
- the haze (total haze) of the optical film can be measured with a haze meter NDH-2000 (manufactured by Nippon Denshoku Industries Co., Ltd.) in accordance with JIS K-7136.
- the light source of the haze meter may be a 5V9W halogen sphere, and the light receiving portion may be a silicon photocell (with a relative visibility filter).
- the haze can be measured under conditions of 23 ° C. and 55% RH.
- the visible light transmittance of the optical film of the present invention is preferably 90% or more, and more preferably 93% or more.
- the elongation at break in at least one direction measured according to JIS-K7127-1999 is preferably 10% or more, more preferably 20% or more, and further preferably 30. % Or more.
- the optical film of the present invention can be produced by a solution casting method or a melt casting method.
- the solution casting method is preferable from the viewpoint of suppressing optical defects such as coloring of the optical film, foreign matter defects, and die lines, and the melt casting method is preferable from the viewpoint of suppressing the solvent from remaining in the optical film.
- A) Solution casting method An optical film containing a cellulose ester is produced by the solution casting method.
- A1) A step of preparing a dope by dissolving at least a cellulose ester and, if necessary, other additives in a solvent.
- A2) a step of casting the dope on an endless metal support,
- A3) a step of evaporating the solvent from the cast dope to form a web,
- A4) a step of peeling the web from the metal support, and A5) After drying, it includes a step of drawing to obtain a film.
- A1) Dope preparation step In a dissolution vessel, a dope is prepared by dissolving cellulose ester and other additives as required in a solvent.
- the solvent can be used without limitation as long as it dissolves cellulose ester and other additives.
- a chlorinated organic solvent methylene chloride
- a non-chlorinated organic solvent methyl acetate, ethyl acetate, amyl acetate, acetone, tetrahydrofuran, 1,3-dioxolane, 1,4-dioxane, cyclohexanone, ethyl formate, 2,2,2-trifluoroethanol, 2,2,3,3-hexafluoro-1-propanol, 1,3-difluoro-2-propanol, 1,1,1,3,3,3-hexafluoro- 2-methyl-2-propanol, 1,1,1,3,3,3-hexafluoro-2-propanol, 2,2,3,3,3-pentafluoro-1-propanol, nitroethane, etc.
- methylene chloride methyl acetate, ethyl acetate, am
- the dope preferably further contains 1 to 40% by mass of a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- the ratio of the alcohol in the dope is high, the web is gelled and peeling from the metal support becomes easy.
- the ratio of alcohol in the dope is small, dissolution of cellulose acetate in a non-chlorine organic solvent system can be promoted.
- linear or branched aliphatic alcohol having 1 to 4 carbon atoms examples include methanol, ethanol, n-propanol, iso-propanol, n-butanol, sec-butanol, tert-butanol and the like. Of these, ethanol is preferred because of high dope stability, relatively low boiling point, and high drying properties.
- the dope preferably contains a solvent, methylene chloride, and a linear or branched aliphatic alcohol having 1 to 4 carbon atoms.
- the concentration of the cellulose ester in the dope is preferably higher in order to reduce the drying load, but if the concentration of the cellulose ester is too high, it is difficult to filter. Therefore, the concentration of the cellulose ester in the dope is preferably in the range of 10 to 35% by mass, more preferably in the range of 15 to 25% by mass.
- the method of dissolving the cellulose ester in a solvent can be, for example, a method of dissolving under heating and pressure.
- a higher heating temperature is preferable from the viewpoint of increasing the solubility of the cellulose ester. If the temperature is too high, it is necessary to increase the pressure, and the productivity is lowered. Therefore, the heating temperature is preferably in the range of 45 to 120 ° C.
- the additive may be added batchwise to the dope, or an additive solution may be separately prepared and added inline.
- an additive solution may be separately prepared and added inline.
- thermoplastic resin is preferably in the range of 1 to 10 parts by mass, more preferably in the range of 3 to 5 parts by mass with respect to 100 parts by mass of the solvent.
- an in-line mixer such as a static mixer (manufactured by Toray Engineering) or SWJ (Toray static type in-pipe mixer Hi-Mixer) is preferably used.
- the obtained dope may contain insoluble matters such as impurities contained in the cellulose ester as a raw material, for example. Such an insoluble matter can become a bright spot foreign material in the obtained film. In order to remove insoluble matter, it is preferable to further filter the obtained dope.
- the dope filtration is preferably performed so that the number of bright spot foreign substances in the obtained film is a certain value or less.
- the number of bright spot foreign matters having a diameter of 0.01 mm or more is 200 / cm 2 or less, preferably 100 / cm 2 or less, more preferably 50 / cm 2 or less, and still more preferably 30 Filtration is performed so that the number of particles / cm 2 or less, particularly preferably 10 / cm 2 or less.
- the bright spot foreign matter having a diameter of 0.01 mm or less is also preferably 200 pieces / cm 2 or less, more preferably 100 pieces / cm 2 or less, further preferably 50 pieces / cm 2 or less, It is more preferably 30 pieces / cm 2 or less, particularly preferably 10 pieces / cm 2 or less, and most preferably none.
- the number of bright spot foreign matter on the film can be measured by the following procedure.
- A2) Casting step The dope is cast on the endless metal support from the slit of the pressure die.
- the metal support a stainless steel belt or a drum whose surface is plated with a casting is preferably used.
- the surface of the metal support is preferably mirror-finished.
- the cast width can be in the range of 1-4m.
- the surface temperature of the metal support in the casting step is set to ⁇ 50 ° C. or more and below the temperature at which the solvent boils and does not foam. A higher temperature is preferable because the web can be dried at a higher speed, but it is within a temperature range in which foaming of the web and deterioration of flatness can be prevented.
- the surface temperature of the metal support is preferably in the range of 0 to 100 ° C., more preferably in the range of 5 to 30 ° C.
- the metal support may be cooled so that the web is gelled and can be peeled off from the drum in a state containing a large amount of residual solvent.
- the method for adjusting the temperature of the metal support is not particularly limited, and there are a method of blowing hot air or cold air, and a method of bringing hot water into contact with the back side of the metal support. It is preferable to use warm water because heat transfer is performed efficiently, so that the time until the temperature of the metal support becomes constant is short.
- A3) Solvent evaporation step The web (dope film obtained by casting the dope on the metal support) is heated on the metal support to evaporate the solvent.
- the drying method and drying conditions of the web can be the same as in the above-described A2) casting step.
- A4) Peeling Step The web obtained by evaporating the solvent on the metal support is peeled off at the peeling position on the metal support.
- the residual solvent amount of the web at the time of peeling at the peeling position on the metal support is preferably in the range of 10 to 150% by mass, and 20 to 40% by mass in order to improve the flatness of the obtained film. % Or in the range of 60 to 130% by mass, and more preferably in the range of 20 to 30% by mass or 70 to 120% by mass.
- the amount of residual solvent in the web is defined by the following formula.
- Residual solvent amount (%) (mass before web heat treatment ⁇ mass after web heat treatment) / (mass after web heat treatment) ⁇ 100 Note that the heat treatment for measuring the residual solvent amount means a heat treatment at 115 ° C. for 1 hour.
- the web obtained by peeling from the metal support is dried as necessary and then stretched.
- the web may be dried while being conveyed by a large number of rollers arranged above and below, or may be dried while being conveyed while fixing both ends of the web with clips.
- the method for drying the web may be a method of drying with hot air, infrared rays, a heating roller, microwaves, or the like, and a method of drying with hot air is preferable because it is simple.
- the optical film having a desired retardation is obtained by stretching the web.
- the retardation of the optical compensation film can be controlled by adjusting the magnitude of tension on the web.
- the web is stretched in one of the web width direction (TD direction), the transport direction (MD direction), and the diagonal direction.
- the optical film of the present invention When used as a ⁇ / 4 retardation film for antireflection of an organic EL display device, it can be stretched at least in an oblique direction, specifically in a 45 ° direction with respect to the web conveyance direction. preferable.
- a circularly polarizing plate can be easily produced by simply laminating a film with a roll-to-roll so that the longitudinal directions overlap each other. The cut loss of the film can be reduced, which is advantageous in production.
- the web may be stretched uniaxially or biaxially.
- Biaxial stretching may be sequential biaxial stretching or simultaneous biaxial stretching.
- the draw ratio depends on the film thickness of the obtained optical film and the required retardation, but for example, the draw ratio in the biaxial direction perpendicular to each other is finally 0.8 to 1 in the casting direction.
- the draw ratio in the biaxial direction perpendicular to each other is finally 0.8 to 1 in the casting direction.
- Within a range of 5 times preferably within a range of 1.1 to 2.5 times in the width direction, within a range of 0.8 to 1.0 times in the casting direction and 1.2 to 2 times in the width direction It is more preferable to be within the range of 2.0 times.
- the stretching ratio in the oblique direction is preferably in the range of 1.1 to 5.0 times, more preferably in the range of 1.2 to 2.5 times.
- the draw ratio is represented by the ratio W / W0 of the film length in the drawing direction before and after stretching (W represents the length before stretching, and W0 represents the length after stretching).
- W represents the length before stretching
- W0 represents the length after stretching
- the stretching temperature is preferably in the range of 120 to 230 ° C., more preferably in the range of 130 to 220 ° C., and even more preferably in the range of greater than 140 ° C. and 210 ° C. or less.
- the stretching method of the web is not particularly limited, and a method of making a difference in circumferential speed between a plurality of rollers and stretching in the casting direction (conveying direction) using the circumferential speed difference (roller stretching method), both ends of the web Fix with clips and pins, widen the gap between clips and pins in the casting direction and stretch in the casting direction, spread in the width direction and stretch in the width direction, both in the casting direction and in the width direction It may be a method of expanding and stretching in both the casting direction and the width direction (tenter stretching method).
- a tenter that can independently control the web gripping length (distance from the start of gripping to the end of gripping) left and right by gripping means that grips the left and right in the width direction may be used. These stretching methods may be combined.
- Examples of the stretching apparatus having a mechanism for stretching in an oblique direction include the stretching apparatus described in Example 1 of Japanese Patent Laid-Open No. 2003-340916, the stretching apparatus illustrated in FIG. The stretching apparatus described in 2007-30466 and the stretching apparatus used in Example 1 of Japanese Patent Laid-Open No. 2007-94007 are included.
- the residual solvent of the web at the start of stretching is preferably 20% by mass or less, more preferably 15% by mass or less.
- the film after stretching is dried as necessary and then wound.
- the film may be dried while being transported by a large number of rollers arranged on the top and bottom (roller method), or may be dried while being transported while fixing both ends of the web with clips. (Tenter method).
- B) Melt Casting Method The method for producing the optical film of the present invention by the melt casting method is as follows: B1) Step of producing molten pellets (pelletizing step), B2) Step of extruding after melting and kneading the molten pellets (melting) Extruding step), B3) a step of cooling and solidifying the molten resin to obtain a web (cooling solidification step), and B4) a step of stretching the web (stretching step).
- the resin composition containing the thermoplastic resin as the main component of the optical film is previously kneaded and pelletized.
- the pelletization can be performed by a known method.
- a resin composition containing the above-described thermoplastic resin and, if necessary, an additive such as a plasticizer is melt-kneaded in an extruder, and then die-molded. Extruded into strands. The molten resin extruded in a strand form can be cooled with water or air, and then cut to obtain pellets.
- the raw material of the pellet is preferably dried before being supplied to the extruder in order to prevent decomposition.
- the mixture of the antioxidant and the thermoplastic resin may be mixed with each other, may be mixed by impregnating the thermoplastic resin with an antioxidant dissolved in a solvent, or the antioxidant may be thermoplastic.
- the resin may be sprayed and mixed.
- the atmosphere around the feeder portion of the extruder and the outlet portion of the die is preferably an atmosphere of dehumidified air or nitrogen gas in order to prevent deterioration of the raw material of the pellet.
- the extruder it is preferable to knead at a low shearing force or at a low temperature so as not to cause deterioration of the resin (decrease in molecular weight, coloring, gel formation, etc.).
- a twin-screw extruder it is preferable to use a deep groove type screw so that the rotational directions of the two screws are the same.
- two screw shapes mesh with each other.
- An optical film may be produced by melting and kneading a thermoplastic resin that has not been melt-kneaded as a raw material with an extruder as it is, without pelletizing the resin composition containing the thermoplastic resin.
- the melting temperature of the film material in the extruder is preferably in the range of Tg to (Tg + 100) ° C., more preferably when the glass transition temperature of the film is Tg (° C.), although it depends on the type of film material. Is in the range of (Tg + 10) to (Tg + 90) ° C.
- a mixing device such as a static mixer is further arranged on the downstream side of the extruder to uniformly mix these components. May be.
- the molten resin extruded from the extruder is filtered through a leaf disc filter or the like as necessary, and further mixed with a static mixer or the like, and extruded from a die into a film.
- the extrusion flow rate is preferably stabilized using a gear pump.
- the leaf disk filter used for removal of a foreign material is a stainless fiber sintered filter.
- the stainless steel fiber sintered filter is an integrated, intricately intertwined stainless steel fiber body that is compressed and sintered by integrating the contact points. The density is changed according to the thickness of the fiber and the amount of compression, and the filtration accuracy is adjusted. it can.
- the melting temperature of the resin at the exit of the die can be in the range of about 200-300 ° C.
- Cooling and solidifying step The resin extruded from the die is nipped between the cooling roller and the elastic touch roller to make the film-like molten resin a predetermined thickness. Then, the film-like molten resin is cooled and solidified stepwise by a plurality of cooling rollers.
- the surface temperature of the cooling roller can be Tg (° C.) or lower when the glass transition temperature of the obtained film is Tg (° C.).
- the surface temperatures of the plurality of cooling rollers may be different.
- the elastic touch roller is also called a pinching rotary body.
- a commercially available elastic touch roller can also be used.
- the film surface temperature on the elastic touch roller side can be in the range of Tg to (Tg + 110) ° C. of the film.
- the film-like molten resin solidified from the cooling roller is peeled off with a peeling roller or the like to obtain a web.
- peeling the film-like molten resin it is preferable to adjust the tension in order to prevent deformation of the obtained web.
- Stretching step The obtained web is stretched with a stretching machine to obtain a film. Stretching is performed in any of the web width direction, the conveyance direction, or the oblique direction.
- the optical film of the present invention When used as a ⁇ / 4 retardation film for antireflection of an organic EL display device, it can be stretched at least in an oblique direction, specifically in a 45 ° direction with respect to the web conveyance direction. preferable.
- the web stretching method, stretching ratio, and stretching temperature may be the same as described above.
- the optical film according to the present invention can be used in the polarizing plate of the present invention and the liquid crystal display device of the present invention using the polarizing plate.
- the optical film according to the present invention is preferably a film that also functions as a polarizing plate protective film. In that case, it is not necessary to prepare an optical film having a phase difference separately from the polarizing plate protective film.
- the manufacturing process can be simplified by reducing the thickness of the apparatus.
- the polarizing plate according to the present invention is preferably bonded to both surfaces of the liquid crystal cell via an adhesive layer.
- the polarizing plate according to the present invention can be produced by a general method.
- the polarizer side of the optical film according to the present invention is subjected to alkali saponification treatment and bonded to at least one surface of a polarizer prepared by immersion and stretching in an iodine solution using a completely saponified polyvinyl alcohol aqueous solution. preferable.
- Another polarizing plate protective film can be bonded to the other surface.
- the optical film according to the present invention is a liquid crystal display device, it is preferably provided on the liquid crystal cell side of the polarizer, and a conventional polarizing plate protective film can be used as the film outside the polarizer.
- a commercially available cellulose ester film for example, Konica Minoltack KC8UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC6UY, KC4UY, KC4UE, KC8UE-HA, KC8UY-HA, HAC KC8UXW-RHA-C, KC8UXW-RHA-NC, KC4UXW-RHA-NC, manufactured by Konica Minolta Advanced Layer Co., Ltd.
- a commercially available cellulose ester film for example, Konica Minoltack KC8UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC6UY, KC4UY, KC4UE, KC8UE-HA, KC8UY-HA, HAC KC8UXW-RHA-C, KC8UXW-R
- FIG. 1 is a schematic diagram illustrating an example of a configuration of a liquid crystal display device.
- the retardation film 105 and the polarizer 104 are bonded via an active energy ray-curable adhesive 103B. It is preferable to use an active energy ray-curable adhesive because moisture permeability can be effectively controlled.
- curable adhesives such as urethane adhesives, epoxy adhesives, aqueous polymer-isocyanate adhesives, thermosetting acrylic adhesives, Use moisture-curing urethane adhesive, anaerobic adhesive such as polyether methacrylate type, ester methacrylate type, oxidized polyether methacrylate, cyanoacrylate instant adhesive, acrylate and peroxide two-component instant adhesive be able to.
- the pressure-sensitive adhesive may be a one-component type or a two-component type in which two or more components are mixed before use.
- the adhesive may be a solvent system using an organic solvent as a medium, or an aqueous system such as an emulsion type, a colloidal dispersion liquid type, or an aqueous solution type that is a medium containing water as a main component, or a solvent-free type. It may be a mold.
- concentration of the adhesive solution may be appropriately determined depending on the film thickness after bonding, the coating method, the coating conditions, and the like, and is usually 0.1 to 50% by mass.
- active energy ray curable adhesive Preferred examples of the active energy ray-curable adhesive include, for example, ( ⁇ ) cationically polymerizable compound, ( ⁇ ) photocationic polymerization initiator, and ( ⁇ ) as disclosed in JP 2011-028234 A Examples include an active energy ray-curable adhesive composition containing components of a photosensitizer that exhibits maximum absorption in light having a wavelength longer than 380 nm and ( ⁇ ) a naphthalene photosensitizer. Of course, other active energy ray-curable adhesive compositions may be used.
- the polarizing plate can be produced by bonding the optical film of the present invention to one surface of the polarizer using an active energy ray-curable adhesive.
- an active energy ray-curable adhesive When the adhesiveness is different between the two surfaces of the retardation film, it is preferable to bond them to the one having good adhesiveness.
- the polarizing plate includes an adhesive application step of forming an adhesive layer by applying the following active energy ray-curable adhesive to at least one of the adhesive surfaces of the polarizer and the retardation film, and the adhesive layer A bonding step in which the polarizer and the retardation film are bonded and bonded via the adhesive layer, and a curing step in which the adhesive layer is cured in a state where the polarizer and the retardation film are bonded via the adhesive layer; It can manufacture with the manufacturing method containing. Moreover, there may be a pretreatment step in which the surface of the retardation film to which the polarizer is adhered is subjected to an easy adhesion treatment.
- Pretreatment process In the pretreatment step, the surface of the retardation film that adheres to the polarizer is subjected to easy adhesion treatment. When the retardation film and the protective film are bonded to both surfaces of the polarizer, easy adhesion treatment is performed on each of the retardation film and the protective film. In the next adhesive application process, the surface subjected to easy adhesion treatment is treated as a bonding surface with a polarizer, so on both surfaces of the retardation film, on the surface to be bonded with the active energy ray-curable adhesive, Apply easy adhesion treatment. Examples of the easy adhesion treatment include corona treatment and plasma treatment.
- the active energy ray-curable adhesive is applied to at least one of the adhesive surfaces of the polarizer and the retardation film.
- the application method is not particularly limited. For example, various wet coating methods such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used.
- various wet coating methods such as a doctor blade, a wire bar, a die coater, a comma coater, and a gravure coater can be used.
- the method of pressing with a roller etc. and spreading uniformly can also be utilized.
- Bonding process After apply
- this bonding step for example, when an active energy ray-curable adhesive is applied to the surface of the polarizer in the previous application step, a retardation film is superimposed thereon.
- a polarizer is superimposed thereon.
- an active energy ray-curable adhesive is cast between the polarizer and the retardation film, the polarizer and the retardation film are superposed in that state.
- both sides of the polarizer are respectively attached via an active energy ray curable adhesive.
- a phase difference film and a protective film are overlaid.
- both sides in this state when the retardation film is overlaid on one side of the polarizer, when the retardation film and the protective film are overlaid on the polarizer side and the retardation film side, and on both sides of the polarizer
- rollers or the like As the material of the roller, metal, rubber or the like can be used.
- the rollers arranged on both sides may be made of the same material or different materials.
- an active energy ray curable adhesive is irradiated with active energy rays, and a cationic polymerizable compound (eg, epoxy compound or oxetane compound) or a radical polymerizable compound (eg, acrylate compound, acrylamide type).
- a cationic polymerizable compound eg, epoxy compound or oxetane compound
- a radical polymerizable compound eg, acrylate compound, acrylamide type.
- the active energy ray-curable adhesive containing the compound or the like is cured, and the polarizer and the retardation film, or the polarizer and the retardation film, which are superposed via the active energy ray-curable adhesive, are adhered.
- the active energy ray may be irradiated from either the polarizer side or the retardation film side.
- the active energy is in a state where the retardation film and the protective film are superimposed on both sides of the polarizer via an active energy ray-curable adhesive, respectively. It is advantageous to irradiate the line and simultaneously cure the active energy ray curable adhesive on both sides.
- Visible light, ultraviolet rays, X-rays, electron beams, etc. can be used as the active energy rays applied for curing, but electron beams and ultraviolet rays are generally preferred because they are easy to handle and have a sufficient curing rate. Used.
- the acceleration voltage is preferably in the range of 5 to 300 kV, more preferably in the range of 10 to 250 kV. If the acceleration voltage is less than 5 kV, the electron beam may not reach the adhesive and may be insufficiently cured. If the acceleration voltage exceeds 300 kV, the penetrating force through the sample is too strong and the electron beam rebounds. There is a risk of damaging the polarizer.
- the irradiation dose is in the range of 5 to 100 kGy, more preferably in the range of 10 to 75 kGy.
- the adhesive becomes insufficiently cured, and when it exceeds 100 kGy, the retardation film and the polarizer are damaged, resulting in a decrease in mechanical strength and yellowing to obtain predetermined optical characteristics. I can't.
- Arbitrary appropriate conditions can be employ
- the dose of ultraviolet rays in the range of 50 ⁇ 1500mJ / cm 2 in accumulated light amount, and even more preferably in the range of within the range of 100 ⁇ 500mJ / cm 2.
- the line speed depends on the curing time of the adhesive, but is preferably in the range of 1 to 500 m / min, more preferably 5 to 300 m / min, and still more preferably 10 to 100 m. / Min. If the line speed is too slow, the productivity is poor, or the retardation film is damaged too much, and a polarizing plate that can withstand a durability test cannot be produced. When the line speed is too high, the adhesive is not sufficiently cured, and the target adhesiveness may not be obtained.
- the thickness of the adhesive layer is not particularly limited, but is usually in the range of 0.01 to 10, and preferably in the range of 0.5 to 5 ⁇ m.
- the polarizing plate protective film used on the surface side of the display device preferably has an antireflection layer, an antistatic layer, an antifouling layer, and a backcoat layer in addition to the antiglare layer or the clear hard coat layer.
- a polarizer which is a main component of a polarizing plate, is an element that allows only light of a plane of polarization in a certain direction to pass.
- a typical polarizer currently known is a polyvinyl alcohol-based polarizing film, which is polyvinyl alcohol.
- iodine is dyed on a system film and one in which dichroic dye is dyed.
- the polarizer is formed by forming a polyvinyl alcohol aqueous solution into a film and dyeing the film by uniaxial stretching or dyeing or uniaxially stretching, and then performing a durability treatment with a boron compound.
- the thickness of the polarizer is preferably in the range of 5 to 30 ⁇ m, particularly preferably in the range of 10 to 20 ⁇ m.
- the optical film and polarizing plate of the present invention can be used in liquid crystal display devices of various drive systems such as STN, TN, OCB, HAN, VA (MVA, PVA), IPS, OCB.
- VA VA, PVA
- VA VA, PVA
- a large-screen liquid crystal display device having a 30-inch or larger screen can reduce coloration during black display due to light leakage and can provide a liquid crystal display device with excellent visibility such as front contrast.
- the circularly polarizing plate of the present invention includes a polarizer (linearly polarizing film) and the optical film of the present invention disposed on at least one surface thereof.
- the optical film of the present invention may be directly bonded to the polarizer, or may be disposed via another layer or film.
- the polarizer may be an iodine polarizing film, a dye polarizing film using a dichroic dye, or a polyene polarizing film.
- the iodine polarizing film and the dye polarizing film may generally be a film obtained by uniaxially stretching a polyvinyl alcohol film and then dyeing with iodine or a dichroic dye. After the film is dyed with iodine or a dichroic dye, it may be a uniaxially stretched film (preferably a film further subjected to a durability treatment with a boron compound).
- the transmission axis of the polarizer is parallel to the stretching direction of the film.
- the polyvinyl alcohol film may be a film formed from a polyvinyl alcohol aqueous solution.
- the polyvinyl alcohol film is preferably an ethylene-modified polyvinyl alcohol film because it is excellent in polarizing performance and durability performance, and has few color spots.
- dichroic dyes examples include azo dyes, stilbene dyes, pyrazolone dyes, triphenylmethane dyes, quinoline dyes, oxazine dyes, thiazine dyes and anthraquinone dyes.
- the thickness of the polarizer is preferably in the range of 5 to 30 ⁇ m, and more preferably in the range of 10 to 20 ⁇ m.
- the angle formed by the transmission axis of the polarizer and the in-plane slow axis of the optical film of the present invention is in the range of 40 to 50 °, preferably 45 °.
- a reflective polarizing plate may be further disposed between the polarizer and the optical film of the present invention.
- the reflective polarizing plate transmits linearly polarized light in a direction parallel to the transmission axis of the polarizer and reflects linearly polarized light in a direction different from the transmission axis.
- the organic EL display device having such a circularly polarizing plate can emit more light emitted from the light emitting layer to the outside.
- Examples of the reflective polarizing plate include a birefringent optical polarizer (described in JP-A-8-503313) in which polymer thin films having different refractive indexes in one direction are alternately laminated, and a polarizing separation film having a cholesteric structure (specifically, Described in Kaihei 11-44816). Moreover, you may arrange
- a transparent protective film other than the optical film of the present invention may be disposed on the other surface of the polarizer.
- the transparent protective film is not particularly limited, and may be a normal cellulose ester film or the like.
- cellulose ester film examples include commercially available cellulose ester films (for example, Konica Minoltack KC8UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC6UY, KC4UY, KC4UE, KC8UE, KC8UY-HA-X8-U8-U8-HA-X8 -C, KC8UXW-RHA-NC, KC4UXW-RHA-NC (manufactured by Konica Minolta Advanced Layer Co., Ltd.) and the like are preferably used.
- cellulose ester films for example, Konica Minoltack KC8UX, KC5UX, KC8UCR3, KC8UCR4, KC8UCR5, KC8UY, KC6UY, KC4UY, KC4UE, KC8UE, KC8UY-HA-X8-U8-U8-
- the thickness of the transparent protective film is not particularly limited, but can be in the range of about 10 to 200 ⁇ m, preferably in the range of 10 to 100 ⁇ m, and more preferably in the range of 10 to 70 ⁇ m.
- the transparent protective film or the ⁇ / 4 retardation film When the transparent protective film or the ⁇ / 4 retardation film is disposed on the outermost surface of the display, the transparent hard coat layer, the antiglare layer, the outermost surface of the transparent protective film or the ⁇ / 4 retardation film, An antireflection layer or the like may be further provided.
- the circularly polarizing plate can be manufactured through a step of bonding a polarizer and the optical film of the present invention.
- a polarizer and the optical film of the present invention As the adhesive used for bonding, for example, a completely saponified polyvinyl alcohol aqueous solution or the like is preferably used.
- the circularly polarizing plate can be preferably used for an image display device such as an organic EL display device or a liquid crystal display device described later.
- the image display device of the present invention includes the optical film of the present invention.
- Examples of the image display device of the present invention include an organic EL display device and a liquid crystal display device.
- FIG. 2 is a schematic diagram showing an example of the configuration of the organic EL display device.
- the organic EL display device is a display device using an organic EL element.
- An organic EL element is an element including an organic light emitting material that emits light by current injection from a pair of electrodes. The energy when electrons injected from the cathode and holes injected from the anode are recombined in the organic light emitting material is taken out as light.
- the organic EL display device 10 includes a light reflecting electrode 12, a light emitting layer 14, a transparent electrode layer 16, a transparent substrate 18, and a circularly polarizing plate 20 in this order.
- the circularly polarizing plate 20 includes a ⁇ / 4 retardation film 20A and a polarizer 20B.
- the ⁇ / 4 retardation film 20A is the optical film of the present invention
- the polarizer 20B is a linearly polarizing film.
- the light reflecting electrode 12 is preferably made of a metal material having a high light reflectance.
- the metal material include Mg, MgAg, MgIn, Al, LiAl, and the like.
- the flatter surface of the light reflecting electrode 12 is preferable because irregular reflection of light can be prevented.
- the light reflecting electrode 12 can be formed by a sputtering method.
- the light reflecting electrode 12 may be patterned. Patterning can be performed by etching.
- the light emitting layer 14 includes R (red), G (green) and B (blue) light emitting layers. Each light emitting layer contains a light emitting material.
- the light emitting material may be an inorganic compound or an organic compound, and is preferably an organic compound.
- Each of the R, G, and B light emitting layers may further include a charge transport material and further have a function as a charge transport layer.
- Each of the R, G, and B light emitting layers further includes a hole transport material, and may further have a function as a hole transport layer.
- the organic EL display device 10 may further include a charge transport layer or a hole transport layer.
- the light emitting layer 14 can be formed by evaporating a light emitting material.
- Each of the R, G, and B light emitting layers is obtained by patterning. Patterning can be performed using a photomask or the like.
- the transparent electrode layer 16 can generally be an ITO (indium tin oxide) electrode.
- the transparent electrode layer 16 can be formed by a sputtering method or the like.
- the transparent electrode layer 16 may be patterned. Patterning can be performed by etching.
- the transparent substrate 18 may be any material that can transmit light, and may be a glass substrate, a plastic film, or the like.
- the circularly polarizing plate 20 is arranged such that the ⁇ / 4 retardation film 20A is located on the transparent substrate 18 side and the polarizer 20B is located on the viewing side V.
- the organic EL display device 10 When the organic EL display device 10 is energized between the light reflecting electrode 12 and the transparent electrode layer 16, the light emitting layer 14 emits light and can display an image. In addition, since each of the R, G, and B light-emitting layers is configured to be energized, a full-color image can be displayed.
- the optical film of the present invention or the circularly polarizing plate including the optical film is not limited to the organic EL display device having the above-described configuration, but also includes International Patent Application No. WO96 / 34514, Japanese Patent Application Laid-Open Nos. 9-127858 and 11-45058.
- the present invention can also be applied to the organic EL display device described in the publication. In that case, the optical film or the circularly polarizing plate of the present invention may be disposed instead of or together with the antireflection means of the organic EL display device provided in advance.
- optical film or circularly polarizing plate of the present invention can also be applied to an inorganic EL display device described in, for example, “Electroluminescence Display” (Toshio Higuchi, Sangyo Tosho Co., Ltd., published in 1991).
- FIG. 3 is a schematic diagram for explaining the antireflection function of the circularly polarizing plate 20.
- the circularly polarized light c2 becomes reverse circularly polarized light c3.
- the reversely polarized circularly polarized light c3 passes through the ⁇ / 4 retardation film 20A and is converted into linearly polarized light b3 orthogonal to the transmission axis of the polarizer 20B. This linearly polarized light b3 is absorbed by the polarizer 20B and cannot pass through.
- the light from the inside of the organic EL display device 10, that is, the light from the light emitting layer 14, includes two circularly polarized components of circularly polarized light c3 and c4.
- One circularly polarized light c3 is converted to linearly polarized light b3 by passing through the ⁇ / 4 retardation film 20A as described above, and is absorbed without passing through the polarizer 20B.
- the other circularly polarized light c4 passes through the ⁇ / 4 retardation film 20A and is converted into linearly polarized light b4 parallel to the transmission axis of the polarizer 20B.
- the linearly polarized light b4 passes through the polarizer 20B and becomes linearly polarized light b4, which is recognized as an image.
- a reflective polarizing plate may be further disposed between the polarizer 20B and the ⁇ / 4 retardation film 20A to reflect the linearly polarized light b3 orthogonal to the transmission axis of the polarizer 20B.
- the reflective polarizing plate can reflect the linearly polarized light b3 without being absorbed by the polarizer 20B, reflect it again by the light reflecting electrode 12, and convert it into linearly polarized light b4 parallel to the transmission axis of the polarizer 20B. .
- a reflective polarizing plate By further disposing a reflective polarizing plate, all of the light emitted by the light emitting layer 14 (circularly polarized light c3 and c4) can be emitted to the outside.
- FIG. 4 is a schematic diagram showing an example of the configuration of the liquid crystal display device.
- the liquid crystal display device 30 includes a liquid crystal cell 40, two polarizing plates 50 and 60 that sandwich the liquid crystal cell 40, and a backlight 70.
- the display method of the liquid crystal cell 40 is not particularly limited, and is a TN (Twisted Nematic) method, an STN (Super Twisted Nematic) method, an IPS (In-Plane Switching) method, an OCB (Optically Compensated Birefringence Ventilating Ventilation method).
- TN Transmission Nematic
- STN Super Twisted Nematic
- IPS In-Plane Switching
- OCB Optically Compensated Birefringence Ventilating Ventilation method.
- MVA Multi-domain Vertical Alignment
- PVA Patterned Vertical Alignment
- HAN Hybrid Aligned Nematic
- the VA liquid crystal cell has a pair of transparent substrates and a liquid crystal layer sandwiched between them.
- one transparent substrate is provided with a pixel electrode for applying a voltage to the liquid crystal molecules.
- the counter electrode may be disposed on one transparent substrate (transparent substrate on which the pixel electrode is disposed) or may be disposed on the other transparent substrate.
- the liquid crystal layer includes liquid crystal molecules having negative or positive dielectric anisotropy.
- the liquid crystal molecules When the liquid crystal molecules are not applied with voltage due to the alignment regulating force of the alignment film provided on the liquid crystal layer side surface of the transparent substrate and no electric field is generated between the pixel electrode and the counter electrode, the liquid crystal molecules The major axis is oriented so as to be substantially perpendicular to the surface of the transparent substrate.
- an electric field is generated between the pixel electrode and the counter electrode by applying a voltage corresponding to the image signal to the pixel electrode.
- the liquid crystal molecules initially aligned perpendicularly to the surface of the transparent substrate are aligned so that the major axis thereof is in the horizontal direction with respect to the substrate surface.
- the liquid crystal layer is driven, and the image display is performed by changing the transmittance and reflectance of each sub-pixel.
- the polarizing plate 50 is disposed on the viewing side V and includes a polarizer 52 and protective films 54 and 56 that sandwich the polarizer 52.
- the polarizing plate 60 is disposed on the backlight 70 side, and includes a polarizer 62 and protective films 64 and 66 that sandwich the polarizer 62.
- One of the protective films 56 and 64 may be omitted as necessary.
- any of the protective films 54, 56, 64 and 66 can be used as the optical film of the present invention.
- the resin composition of the present invention can be used for an optical lens.
- the resin constituting the optical lens is a water adsorbent resin.
- Preferable water-adsorbing resins include acrylic resins (polymethyl methacrylate, etc.), polyesters (polyethylene terephthalate, etc.), polyamides (nylon, etc.), polycarbonates, cellulose derivatives (cellulose acetate, ethyl cellulose, etc.) and the like.
- acrylic resin or a cellulose derivative is preferable.
- Example 1 Various mixed solutions were prepared below, and the CH / ⁇ interaction between the additive N according to the present invention and the water-adsorbing resin was confirmed.
- 5A to 5D are 1 H-NMR spectra of a mixed solution showing an example of CH / ⁇ bond. 5A to 5D correspond to the measurement results of the mixed liquids 1 to 4, respectively.
- peak c is attributed to water protons.
- Example 2 [Production of Optical Film 101] The following components were stirred and mixed with a dissolver for 50 minutes, and then dispersed with Manton Gorin to prepare a fine particle dispersion.
- Fine particles Fine particles (Aerosil R972V manufactured by Nippon Aerosil Co., Ltd.): 11 parts by mass Ethanol: 89 parts by mass Among the components of the following fine particle addition liquid, methylene chloride was charged into a dissolution tank, and the prepared fine particle dispersion was slowly added in the following addition amount with sufficient stirring. Subsequently, after being dispersed with an attritor so that the particle size of the secondary particles of the fine particles becomes a predetermined size, the fine particles are filtered through Finemet NF (manufactured by Nippon Seisen Co., Ltd.) to obtain a fine particle additive solution. .
- Finemet NF manufactured by Nippon Seisen Co., Ltd.
- Fine particle dispersion 5 parts by mass
- methylene chloride and ethanol were charged into a pressurized dissolution tank.
- the following cellulose derivative C1, sugar ester S, exemplary compound 1 and the prepared fine particle addition liquid were added with stirring, and heated and stirred to completely dissolve.
- the obtained solution was used as Azumi filter paper No. manufactured by Azumi Filter Paper Co., Ltd.
- the main dope was prepared by filtration using 244.
- the obtained dope was uniformly cast on a stainless belt support using an endless belt casting apparatus.
- the solvent in the dope film cast (cast) was evaporated until the residual solvent amount became 75%, and the obtained web was peeled off from the stainless steel belt support.
- the peeled web was conveyed while being gripped by a clip of a tenter stretching apparatus.
- the obtained film was dried while being conveyed by a number of rollers in a drying zone.
- the width direction end of the film held by the tenter clip was slit-removed with a laser cutter, and then wound up to obtain an original film.
- the obtained raw film was unwound and stretched in the width direction of the film at a stretching temperature of glass transition temperature Tg + 20 ° C. and a draw ratio of 1.35 times to obtain an optical film 101.
- the film thickness of the optical film 101 was 50 ⁇ m.
- optical films 102 to 209 In the production of the optical film 1, the type and amount of cellulose derivative, the type and amount of other resin, the type and amount of plasticizer such as sugar ester, the compound represented by the general formula (1) or the comparative compound Optical films 102 to 209 were prepared in the same manner except that the type, the draw ratio, and the film thickness of the optical film after stretching were changed as shown in Tables 3 to 5 below. The film thickness of the optical film was adjusted by changing the flow rate of the dope.
- optical films 190 to 193 were not subjected to stretching treatment.
- the optical films 201 to 207 were prepared by stretching in an oblique direction inclined by 45 ° with respect to the film transport direction at a stretching temperature of glass transition temperature Tg + 20 ° C. of the original film and a stretching ratio of 2.2 times. .
- the film thickness of the obtained optical film 1 was 30 ⁇ m.
- the angle formed by the slow axis in the plane of each of the optical films 201 to 207 and the film transport direction was 45 °.
- Table 2 shows details of the cellulose derivatives used.
- Viscosity 25 ° C., mPa ⁇ s); 43400 Acid value: 0.2 mgKOH / g (Synthesis of aromatic terminal ester compound P2) 251 g 1,2-propylene glycol, 278 g phthalic anhydride, 91 g adipic acid, 610 g benzoic acid, 0.191 g tetraisopropyl titanate as an esterification catalyst
- the flask is charged and gradually heated with stirring until it reaches 230 ° C. in a nitrogen stream.
- a dehydration condensation reaction was carried out for 15 hours, and after completion of the reaction, unreacted 1,2-propylene glycol was distilled off under reduced pressure at 200 ° C. to obtain an aromatic terminal ester compound P2.
- the acid value was 0.10 and the number average molecular weight was 450.
- a retardation value Ro represented by the following formula using an automatic birefringence meter KOBRA-21ADH (Oji Scientific Instruments) at an optical wavelength of 590 nm in an environment of a temperature of 23 ° C. and a relative humidity of 55%. Rt was measured.
- the retardation value Ro in the in-plane direction and the retardation value Rt in the thickness direction were calculated according to the following formula.
- n x a refractive index in the direction x in which the refractive index is maximized in the plane direction of the film.
- n y in-plane direction of the film, the refractive index in the direction y perpendicular to the direction x.
- nz represents the refractive index in the thickness direction z of the film.
- d represents the thickness (nm) of the film.
- Ro and Rt were measured in a state where the optical film was sandwiched between two slide glasses, and these were defined as Ro1 and Rt1.
- Ro fluctuation inhibition rate (%) (( ⁇ Ro of reference film) ⁇ ( ⁇ Ro of each sample film)) ⁇ ( ⁇ Ro of reference film) ⁇ 100
- Rt fluctuation suppression rate (%) (( ⁇ Rt of reference film) ⁇ ( ⁇ Rt of each sample film)) ⁇ ( ⁇ Rt of reference film) ⁇ 100
- the retardation value fluctuation inhibitory effect of the compound which concerns on this invention, and a comparative compound was evaluated as fluctuation
- the retardation value fluctuation suppression effect of the additive is such that when 3 parts by mass of the additive is added to 100 parts by mass of the resin as the base material, the Ro fluctuation rate suppression rate and the Rt fluctuation suppression rate are 20% or more. It is more preferable that the Ro fluctuation rate suppression rate and the Rt fluctuation suppression rate are 50% or more, and it is particularly preferable that both the Ro fluctuation rate suppression rate and the Rt fluctuation suppression rate are 70% or more.
- the water absorption of the water adsorbent resin used in the examples was as follows. Based on the method described above, the measurement was performed by immersing in distilled water at 23 ° C. for 24 hours and measuring the mass.
- optical film produced from the resin composition of the present invention is excellent in moisture resistance.
- Example 3 Production of resin composition >> [Preparation of Resin Composition 201]
- methylene chloride and ethanol were charged into a pressure dissolution tank.
- the following cellulose derivative C1 and Exemplified Compound 1 were added with stirring, and heated and stirred to completely dissolve them.
- the obtained solution was used as Azumi filter paper No. manufactured by Azumi Filter Paper Co., Ltd.
- the main dope was prepared by filtration using 244.
- the obtained dope is uniformly cast on a stainless steel belt support using an endless belt casting apparatus. I let you. On the stainless steel belt support, the solvent in the dope film cast (cast) was evaporated until the residual solvent amount became 75%, and the obtained web was peeled off from the stainless steel belt support. The peeled web was conveyed while being gripped by a clip of a tenter stretching apparatus. Next, the obtained film was dried while being conveyed by a number of rollers in a drying zone. The width direction end of the film held by the tenter clip was slit-removed with a laser cutter, and then wound up to obtain an original film.
- the film thickness of the obtained resin composition 201 was 60 ⁇ m.
- Resin compositions 202 to 223 were obtained in the same manner except that the types of resins and exemplary compounds were changed as shown in the following table. All the film thicknesses were 60 micrometers.
- optical films were conditioned for 24 hours in an environment of 23 ° C. and 80% RH, and then in that environment, using an Abbe refractometer (4T: manufactured by Atago Co., Ltd.) using a light source of 590 nm.
- the average refractive index n2 was measured.
- the refractive index variation is shown in Table 8 below.
- the resin composition of the present invention is preferably used as a resin composition for optical lenses such as an imaging lens, a pickup lens, and a spectacle lens, and an optical fiber because the refractive index hardly changes even when the environmental humidity changes. it can.
- Example 4 Preparation of optical film 301
- methylene chloride and ethanol were charged into a pressure dissolution tank.
- the following cellulose derivative C1 and Exemplified Compound 1 were added with stirring, and heated and stirred to completely dissolve them.
- the obtained solution was used as Azumi filter paper No. manufactured by Azumi Filter Paper Co., Ltd.
- the main dope was prepared by filtration using 244.
- the obtained dope is uniformly cast on a stainless steel belt support using an endless belt casting apparatus. I let you. On the stainless steel belt support, the solvent in the dope film cast (cast) was evaporated until the residual solvent amount became 75%, and the obtained web was peeled off from the stainless steel belt support. The peeled web was conveyed while being gripped by a clip of a tenter stretching apparatus. Next, the obtained film was dried while being conveyed by a number of rollers in a drying zone. After slitting the end portion in the width direction of the film held by the tenter clip with a laser cutter, the film was wound up to obtain an optical film.
- the film thickness of the obtained sample film was 60 ⁇ m.
- optical films 302 to 309 As in the composition of Table 9 below, optical films 302 to 309 were obtained in the same manner except that the types of the exemplified compounds were changed. All the film thicknesses were 60 micrometers.
- the optical value variation rate (%) of the wet heat durability test degree was calculated as (Rt1 ⁇ Rt2) ⁇ Rt1 ⁇ 100.
- the optical film of the present invention had no change in appearance before and after the wet heat durability test, but the comparative film was yellowish.
- the optical film of the present invention has little variation in phase value before and after the wet heat durability test and is excellent in wet heat durability.
- Example 5 ⁇ Production of polarizing plate> [Production of Polarizing Plate 101] (Production of polarizer) A 30 ⁇ m thick polyvinyl alcohol film was swollen with water at 35 ° C. The obtained film was immersed in an aqueous solution composed of 0.075 g of iodine, 5 g of potassium iodide and 100 g of water for 60 seconds, and further immersed in an aqueous solution at 45 ° C. composed of 3 g of potassium iodide, 7.5 g of boric acid and 100 g of water. . The obtained film was uniaxially stretched under conditions of a stretching temperature of 55 ° C. and a stretching ratio of 5 times. This uniaxially stretched film was washed with water and dried to obtain a polarizer having a thickness of 10 ⁇ m.
- 3,4-Epoxycyclohexylmethyl-3,4-epoxycyclohexanecarboxylate 45 parts by mass Epolide GT-301 (alicyclic epoxy resin manufactured by Daicel Chemical Industries) 40 parts by mass 1,4-butanediol diglycidyl ether 15 parts by mass Triarylsulfonium hexafluorophosphate 2.3 parts by mass 9,10-dibutoxyanthracene 0.1 parts by mass 1,4-diethoxynaphthalene 2.0 parts by mass (Preparation of polarizing plate 101)
- a polarizing plate 101 having the configuration of the polarizing plate 101A of FIG. 1 was produced according to the following method. The numerical value in parentheses indicates the number of each component described in FIG.
- a KC6UA film manufactured by Konica Minolta Advanced Layer Co., Ltd.
- the prepared active energy ray-curable adhesive solution was microgravure coater (gravure roller: # 300, rotation speed). 140% / line speed) was applied to a thickness of 5 ⁇ m to form an active energy ray-curable adhesive (103A).
- the prepared active energy ray-curable adhesive liquid is applied to the produced optical film 101 (105) so as to have a thickness of 5 ⁇ m as described above, and the active energy ray-curable adhesive ( 103B) was formed.
- the produced polyvinyl alcohol-iodine polarizer (104) is placed and bonded with a roller machine, and the protective film 1 (102)
- a laminate in which / active energy ray-curable adhesive (103A) / polarizer (104) / active energy ray-curable adhesive (103B) / optical film 101 (105) was laminated was obtained.
- the polarizing plate 101 (101A) was produced by irradiating an electron beam from both sides of the laminate.
- the line speed was 20 m / min
- the acceleration voltage was 250 kV
- the irradiation dose was 20 kGy.
- Polarizers 102 to 140 were produced in the same manner as in the production of the polarizing plate 101 except that the optical film 101 was changed to the optical films 102 to 121 and 166 to 184.
- the commercially available VA type liquid crystal display device (40 type display KLV-40J3000 made by SONY) is used to peel off the polarizing plate bonded to both surfaces of the liquid crystal cell, and the produced polarizing plates 101 to 140 are shown in FIG. In this way, the liquid crystal display devices 101 to 140 were manufactured by bonding to both surfaces of the liquid crystal cell. At that time, the direction of the absorption axis of the polarizing plate was adjusted to the same direction as the polarizing plate bonded in advance.
- Table 10 shows that the image display device (liquid crystal display device) of the present invention is excellent in moisture resistance.
- Example 6 [Production of Circular Polarizing Plate 201] (Production of polarizer) A 120 ⁇ m-thick polyvinyl alcohol film was uniaxially stretched under conditions of a stretching temperature of 110 ° C. and a stretching ratio of 5 times. The obtained film was immersed in an aqueous solution composed of 0.075 g of iodine, 5 g of potassium iodide, and 100 g of water for 60 seconds. Subsequently, it was immersed in an aqueous solution at 68 ° C. composed of 6 g of potassium iodide, 7.5 g of boric acid and 100 g of water, washed with water and dried to obtain a polarizer having a thickness of 20 ⁇ m.
- One surface of the optical film 201 produced in Example 1 was subjected to alkali saponification treatment.
- Konica Minolta Tack Film KC6UA manufactured by Konica Minolta Advanced Layer Co., Ltd.
- the saponified surface is a bonding surface with the polarizer.
- the saponified surface of the optical film 201 was bonded to one surface of the polarizer via a 5% aqueous solution of polyvinyl alcohol as an adhesive.
- the saponified surface of the Konica Minolta-tack film KC6UA was bonded to the other surface of the polarizer through a 5% aqueous solution of polyvinyl alcohol to produce a circularly polarizing plate 201.
- the optical film 201 and the polarizer were bonded so that the angle formed by the transmission axis of the polarizer and the slow axis of the optical film 201 was 45 °.
- Circular polarizing plates 202 to 204 were respectively prepared in the same manner as the circular polarizing plate 201 except that the optical film 201 was changed to the optical films 202 to 204 in the production of the circular polarizing plate 201.
- a light reflecting electrode made of chromium having a thickness of 80 nm was formed on a glass substrate by sputtering.
- An ITO thin film having a thickness of 40 nm was formed as an anode on the light reflecting electrode.
- a hole transport layer made of poly (3,4-ethylenedioxythiophene) -polystyrene sulfonate (PEDOT: PSS) having a thickness of 80 nm was formed on the anode by sputtering.
- PEDOT: PSS polystyrene sulfonate
- each of the RGB light emitting layers was formed by patterning on the hole transport layer using a shadow mask. The thickness of the light emitting layer was 100 nm for each color.
- the red light-emitting layer includes tris (8-hydroxyquinolinate) aluminum (Alq 3 ) as a host and a light-emitting compound [4- (dicyanomethylene) -2-methyl-6 (p-dimethylaminostyryl) -4H-pyran] (DCM).
- DCM light-emitting compound
- the blue light emitting layer was formed by co-evaporating the following compound BAlq and the light emitting compound Perylene as a host (mass ratio 90:10).
- a thin film having a thickness of 4 nm made of calcium having a low work function was formed on the obtained RGB light emitting layer as a first cathode capable of efficiently injecting electrons by vacuum deposition.
- a thin film made of aluminum having a thickness of 2 nm was formed as a second cathode to obtain an organic light emitting layer.
- the aluminum used as the second cathode has a role of preventing the first cathode calcium from being chemically altered when a transparent electrode is formed thereon by sputtering.
- a transparent conductive film made of ITO and having a thickness of 80 nm (the first cathode, the second cathode, and the transparent conductive film are combined to form a transparent electrode layer) is formed on the second cathode by sputtering.
- a thin film having a thickness of 200 nm made of silicon nitride was formed on the transparent conductive film by a CVD method to obtain an insulating film (transparent substrate).
- the produced circularly polarizing plate 201 was bonded to the obtained insulating film (transparent substrate) via an adhesive to produce an organic EL display device 157.
- the circularly polarizing plate 201 was bonded so that the optical film 201 was positioned on the insulating film side.
- Organic EL display devices 202 to 204 were manufactured in the same manner as the organic EL display device 201 except that the circularly polarizing plate 201 was changed to the circularly polarizing plates 202 to 204 in the preparation of the organic EL display device 201.
- Table 11 shows that the organic EL display device of the present invention has excellent color unevenness.
- Example 7 In the production of the optical film 1 of Example 2, the type and addition amount of the cellulose derivative, the plasticizer, the type of the compound represented by the general formula (1) or the type of the comparative compound, the draw ratio, and the stretched optical film Optical films 401 to 405 were produced in the same manner except that the film thickness was changed as shown in Table 12 below. The film thickness of the optical film was adjusted by changing the flow rate of the dope. The optical films 401 to 405 were produced by stretching in an oblique direction inclined by 45 ° with respect to the film conveying direction at a stretching temperature of glass transition temperature Tg + 20 ° C. of the original film and a stretching ratio of 2.2 times. . The angle formed between the slow axis in the plane of the obtained optical films 401 to 405 and the film transport direction was 45 °.
- the optical film produced from the resin of the present invention exhibits excellent optical properties as well as moisture resistance and is excellent in reverse wavelength dispersion.
- Example 8 [Preparation of polarizing plates 401 to 405]
- the circularly polarizing plates 401 to 405 were similarly produced except that the optical film 201 was changed to the optical films 401 to 405.
- Table 13 shows that the organic EL display device of the present invention is excellent in color unevenness.
- the resin composition of the present invention can be used for an optical film and an optical lens in which the optical value variation depending on the environmental humidity is suppressed and the optical value variation depending on the environmental humidity is suppressed. Furthermore, it can be used for a polarizing plate, a circularly polarizing plate and an image display device which are excellent in moisture resistance using the optical film.
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Abstract
Description
(a)作製した前記光学フィルム(サンプルフィルム)と同一膜厚で、かつ前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物を含まない光学フィルム(基準フィルム)を、サンプルフィルムと同様に作製し、
(b)前記サンプルフィルムと基準フィルムとを温度23℃の純水中に24時間水浸漬する。
(c)前記サンプルフィルムと基準フィルムについて、温度23℃、相対湿度55%における光波長590nmでのリターデーション値Ro値及びRt値を、水浸漬前と後に、測定し、水浸漬前後のリターデーション値の差の絶対値ΔRo及びΔRtをそれぞれの光学フィルムについて求める。
(d)下式により、リターデーション値(Ro値及びRt値)の変動抑制率を求める。
Rt変動抑制率(%)=((基準フィルムのΔRt)-(サンプルフィルムのΔRt))÷(基準フィルムのΔRt)×100
3.前記水吸着性樹脂の23℃における吸水率が、0.5~10質量%の範囲内であることを特徴とする第1項又は第2項に記載の樹脂組成物。
8.前記L1、L2、L3及びL4が、それぞれ独立に単結合を表すことを特徴とする第7項に記載の樹脂組成物。
11.前記一般式(1)で表される構造を有する化合物が、下記一般式(1.1)で表される構造を有するトリアゾール化合物であることを特徴とする、第7項に記載の樹脂組成物。
12.前記一般式(1.1)で表される構造を有するトリアゾール化合物が、下記一般式(1.2)で表される構造を有するトリアゾール化合物であることを特徴とする第11項に記載の樹脂組成物。
13.第1項から第12項までのいずれか一項に記載の樹脂組成物を用いて作製されたことを特徴とする光学フィルム。
式(II) Rt={(nx+ny)/2-nz}×d
(式中、nxは、光学フィルムの面内方向において屈折率が最大になる方向xにおける屈折率を表し、nyは、光学フィルムの面内方向において、前記方向xと直交する方向yにおける屈折率を表し、nzは、光学フィルムの厚さ方向zにおける屈折率を表し、dは、光学フィルムの厚さ(nm)を表す。)
16.23℃、55%RHの環境下で、光波長450nm、550nm及び650nmにおける面内方向の位相差値Roを、それぞれRo(450)、Ro(550)及びRo(650)としたとき、当該Ro(450)、Ro(550)及びRo(650)が、下記式(a1)~(a3)を満たすことを特徴とする第13項から第15項までのいずれか一項に記載の光学フィルム。
(a2)0.72≦Ro(450)/Ro(550)≦0.96
(a3)0.83≦Ro(550)/Ro(650)≦0.97
17.第13項から第16項までのいずれか一項に記載の光学フィルムが、偏光子の少なくとも一方の面に備えられていることを特徴とする偏光板。
本発明者らは、水吸着性樹脂と添加剤の相互作用形式に着目し、水素結合性や双極子相互作用性の低い疎水的な芳香族化合物が意外にもよく水吸着性樹脂と相溶することから、水吸着性樹脂の主鎖又は側鎖に存在するCH部分と、添加剤の芳香族化合物のπ電子との間にいわゆる「CH/π相互作用」が機能していると考えた。CH/π相互作用は、ロンドン分散力の寄与が大きい非極性の相互作用であるため、水などの誘電率の高い極性溶媒中においても有効に働くことから、このCH/π相互作用を積極的に活用すれば、水分子と樹脂との相互作用よりも添加剤と樹脂の相互作用の方が強くなり、結果として水吸着性樹脂と添加剤との間に水が入り込むことを防ぐことができ、前記課題である光学的特性の変動が抑制できると考えた。このような考えのもと、種々の化合物を検討した結果、特定の化合物が高い抑制効果を示すことを見いだし、本発明に至った。
本発明の樹脂組成物を用いて作製された光学フィルムのリターデーション値(Ro値又はRt値)の変動抑制率は、下記測定条件下で、20~100%の範囲内であることを特徴とする。
測定条件
(a)作製した前記光学フィルム(サンプルフィルム)と同一膜厚で、かつ前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物を含まない光学フィルム(基準フィルム)を、サンプルフィルムと同様に作製し、
(b)前記サンプルフィルムと基準フィルムとを温度23℃の純水中に24時間水浸漬する。
(c)前記サンプルフィルムと基準フィルムについて、温度23℃、相対湿度55%における光波長590nmでのリターデーション値Ro値及びRt値を、水浸漬前と後に、測定し、水浸漬前後のリターデーション値の差の絶対値ΔRo及びΔRtをそれぞれの光学フィルムについて求める。
(d)下式により、リターデーション値(Ro値及びRt値)の変動抑制率を求める。
Rt変動抑制率(%)=((基準フィルムのΔRt)-(サンプルフィルムのΔRt))÷(基準フィルムのΔRt)×100
サンプルフィルムと基準フィルムの光学フィルム、は公知の方法で一定膜厚及び一定の厚さで作製することができる。
リターデーション値の測定は、光波長590nmで、自動複屈折計KOBRA-21ADH(王子計測機器)を用いて行うことができる。
式(II):Rt(590)={(nx+ny)/2-nz}×d
〔式(I)及び式(II)において、nxは、フィルムの面内方向において屈折率が最大になる方向xにおける屈折率を表す。nyは、フィルムの面内方向において、前記方向xと直交する方向yにおける屈折率を表す。nzは、フィルムの厚さ方向zにおける屈折率を表す。dは、フィルムの厚さ(nm)を表す。〕
《樹脂組成物》
本発明の樹脂組成物は、樹脂が、水吸着性樹脂であって、かつ5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物が、ベンゼン環よりNICS値が小さい又は等しい5員若しくは6員の芳香族炭化水素環又は芳香族複素環のいずれかを少なくとも三つ有し、そのうちの少なくとも一つはベンゼン環よりNICS値が小さく、かつ、前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環が、相互に単結合又は2個以下の原子を介して連結された化合物(以下添加剤Nともいう。)である。
本発明の樹脂組成物においては、添加剤Nが、下記一般式(1)で表わされる構造の化合物であることが特に好ましい。
一般式(1)で表される化合物は一般式(2)で表される化合物であることが好ましい。
mが小さい方がセルロースエステルとの相溶性に優れるため、mは0~2の整数であることが好ましく、0~1の整数であることがより好ましい。
一般式(1)で表される構造を有する化合物は、下記一般式(1.1)で表される構造を有するトリアゾール化合物であることが好ましい。
さらに、上記一般式(1.1)で表される構造を有するトリアゾール化合物は、下記一般式(1.2)で表される構造を有するトリアゾール化合物であることが好ましい。
前記一般式(1)、(2)、(1.1)又は(1.2)で表される化合物は、水和物、溶媒和物若しくは塩を形成してもよい。なお、本発明において、水和物は有機溶媒を含んでいてもよく、また溶媒和物は水を含んでいてもよい。即ち、「水和物」及び「溶媒和物」には、水と有機溶媒のいずれも含む混合溶媒和物が含まれる。塩としては、無機又は有機酸で形成された酸付加塩が含まれる。無機酸の例として、ハロゲン化水素酸(塩酸、臭化水素酸など)、硫酸、リン酸などが含まれ、またこれらに限定されない。また、有機酸の例には、酢酸、トリフルオロ酢酸、プロピオン酸、酪酸、シュウ酸、クエン酸、安息香酸、アルキルスルホン酸(メタンスルホン酸など)、アリルスルホン酸(ベンゼンスルホン酸、4-トルエンスルホン酸、1,5-ナフタレンジスルホン酸など)などが挙げられ、またこれらに限定されない。これらのうち好ましくは、塩酸塩、酢酸塩、プロピオン酸塩、酪酸塩である。
前記一般式(1)で表わされる化合物において、1,2,4-トリアゾール環を有する化合物は、いかなる原料を用いても構わないが、ニトリル誘導体又はイミノエーテル誘導体と、ヒドラジド誘導体を反応させる方法が好ましい。反応に用いる溶媒としては、原料と反応しないと溶媒であれば、いかなる溶媒でも構わないが、エステル系(例えば、酢酸エチル、酢酸メチル等)、アミド系(ジメチルホルムアミド、ジメチルアセトアミド等)、エーテル系(エチレングリコールジメチルエーテル等)、アルコール系(例えば、メタノール、エタノール、プロパノール、イソプロパノール、n-ブタノール、2-ブタノール、エチレングリコール、エチレングリコールモノメチルエーテル等)、芳香族炭化水素系(例えば、トルエン、キシレン等)、水を挙げられることができる。使用する溶媒として、好ましくは、アルコール系溶媒である。また、これらの溶媒は、混合して用いても良い。
(例示化合物6の合成)
例示化合物6は以下のスキームによって合成することができる。
(例示化合物176の合成)
例示化合物176は以下のスキームによって合成することができる。
その他の化合物についても同様の方法によって合成が可能である。
本発明に係る前記一般式(1)で表される化合物は、適宜量を調整して光学フィルムに含有することができるが、添加量としては光学フィルムを形成する樹脂(例えば、セルロースエステル等)に対して、1~15質量%含むことが好ましく、特に、2~10質量%含むことが好ましい。また、前記一般式(1)で表される構造を有する化合物を1種のみ使用してもよく、前記一般式(1)で表される構造を有する複数種の化合物を併用してもよい。この範囲内であれば、本発明の光学フィルムの機械強度を損なうことなく、環境湿度の変化に依存した光学値の変動を低減することができる。
本発明の樹脂組成物は水吸着性樹脂を含有する。
水吸着性樹脂から作製したフィルムを23℃、55%RHに調湿された部屋に4時間以上放置した後の該フィルムの重量を測定し、これをW1とする。次に、該フィルムを23℃の蒸留水に24時間浸漬させた後、取り出したフィルムの質量を測定し、これをW2とする。吸水率を以下の式に基づいて算出する。
本発明の樹脂組成物は、少なくとも樹脂と添加剤Nとを含有する樹脂組成物である。樹脂は本発明の光学フィルムの基材及び光学レンズとしても用いることができる。
次に、本発明の光学フィルムの詳細について、樹脂組成物を構成する樹脂と共に説明する。
セルロース誘導体は、セルロースを原料とする化合物(セルロース骨格を有する化合物)である。セルロース誘導体の例には、セルロースエーテル(例えば、メチルセルロース、エチルセルロース、ヒドロキシエチルセルロース、ヒドロキシプロピルセルロース、シアノエチルセルロース等)、セルロースエステル(詳細は後述)、セルロースエーテルエステル(例えば、アセチルメチルセルロース、アセチルエチルセルロース、アセチルヒドロキシエチルセルロース、ベンゾイルヒドロキシプロピルセルロース等)、セルロースカーボネート(例えば、セルロースエチルカーボネート等)、セルロースカルバメート(例えば、セルロースフェニルカルバメート等が挙げられる)等の樹脂が含まれ、好ましくはセルロースエステルである。セルロース誘導体は、一種類であってもよいし、二種類以上の混合物であってもよい。
カラム:Shodex K806、K805、K803G(昭和電工株式会社製)を3本接続して使用する;
カラム温度:25℃; 試料濃度:0.1質量%;
検出器:RI Model 504(GLサイエンス社製);
ポンプ:L6000(日立製作所株式会社製);
流量:1.0ml/min
校正曲線:標準ポリスチレンSTK standard ポリスチレン(東ソー株式会社製) Mw=500~1000000の13サンプルによる校正曲線を使用する。13サンプルは、ほぼ等間隔に用いる。
本発明に用いることができる(メタ)アクリル樹脂は、(メタ)アクリル酸エステルの単独重合体であるか、又は(メタ)アクリル酸エステルと他の共重合モノマーとの共重合体であり得る。(メタ)アクリル樹脂は、一種類であっても、二種類以上の混合物であってもよい。(メタ)アクリル酸エステルは、好ましくはメチルメタクリレートである。共重合体におけるメチルメタクリレート由来の構成単位の含有割合は50質量%以上であることが好ましく、70質量%以上であることがより好ましい。
本発明の光学フィルムは、光学フィルムの可塑性を向上させる観点から、前述したセルロースエステル以外の糖エステルを含有することができる。
本発明の光学フィルムは、フィルム製造時の組成物の流動性や、フィルムの柔軟性を向上するために可塑剤を含有していていもよい。可塑剤の例には、ポリエステル系可塑剤、多価アルコールエステル系可塑剤、多価カルボン酸エステル系可塑剤(フタル酸エステル系可塑剤を含む)、グリコレート系可塑剤、エステル系可塑剤(クエン酸エステル系可塑剤、脂肪酸エステル系可塑剤、リン酸エステル系可塑剤、トリメリット酸エステル系可塑剤等を含む)等が含まれる。これらは、単独で用いても、二種類以上を組み合わせて用いてもよい。
本発明の光学フィルムは、紫外線吸収剤をさらに含有していてもよい。紫外線吸収剤は、ベンゾトリアゾール系、2-ヒドロキシベンゾフェノン系、サリチル酸フェニルエステル系等であり得る。具体的には、2-(5-メチル-2-ヒドロキシフェニル)ベンゾトリアゾール、2-[2-ヒドロキシ-3,5-ビス(α,α-ジメチルベンジル)フェニル]-2H-ベンゾトリアゾール、2-(3,5-ジ-t-ブチル-2-ヒドロキシフェニル)ベンゾトリアゾール等のトリアゾール類;2-ヒドロキシ-4-メトキシベンゾフェノン、2-ヒドロキシ-4-オクトキシベンゾフェノン、2,2’-ジヒドロキシ-4-メトキシベンゾフェノン等のベンゾフェノン類等が挙げられる。
ビス(2,2,6,6-テトラメチル-4-ピペリジル)セバケート、ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)セバケート等のヒンダードアミン系;
2-(3,5-ジ-t-ブチル-4-ヒドロキシベンジル)-2-n-ブチルマロン酸ビス(1,2,2,6,6-ペンタメチル-4-ピペリジル)、1-[2-[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオニルオキシ]エチル]-4-[3-(3,5-ジ-t-ブチル-4-ヒドロキシフェニル)プロピオニルオキシ]-2,2,6,6-テトラメチルピペリジン等の分子内にヒンダードフェノールとヒンダードアミンの構造を共に有するハイブリッド系;
等が含まれ、好ましくは2-[2-ヒドロキシ-3,5-ビス(α,α-ジメチルベンジル)フェニル]-2-ベンゾトリアゾールや2,2-メチレンビス[4-(1,1,3,3-テトラブチル)-6-(2H-ベンゾトリアゾール-2-イル)フェノール]である。これらは、一種類であっても、二種以上を併用してもよい。
本発明の光学フィルムは、無機化合物又は有機化合物からなる微粒子を含有してもよい。
本発明の光学フィルムは、微粒子の分散性を高める観点から、分散剤をさらに含有していてもよい。分散剤は、アミン系分散剤及びカルボキシ基含有高分子分散剤から選ばれる一種又は二種以上である。
液晶表示装置等の画像表示装置の表示品質の向上のため、光学フィルム中に位相差制御剤を添加するか、配向膜を形成して液晶層を設け、偏光板保護フィルムと液晶層由来の位相差を複合化することにより、光学フィルムに光学補償能を付与することができる。
本発明の光学フィルムは、成形加工時の熱分解や熱による着色を防止するための酸化防止剤、帯電防止剤や難燃剤等をさらに含有していていもよい。
本発明の光学フィルムは、有機EL表示装置や液晶表示装置等の画像表示装置の光学フィルムとして用いることができる。本発明の光学フィルムは、偏光板保護フィルム、位相差フィルム、光学補償フィルムに好ましく用いられる。位相差フィルム又は光学補償フィルムが偏光板保護フィルムを兼ねていることが好ましい。
条件2:温度23℃、相対湿度55%の環境下で、波長590nmで測定した下式(II)で表される厚さ方向のリターデーション値Rt(590)が、100~300nmの範囲内である。
(ここで、フィルムの面内における遅相軸方向の屈折率をnx、フィルムの面内における遅相軸に直交する方向の屈折率をny、フィルムの厚さ方向の屈折率をnz、dはフィルムの厚さ(nm)をそれぞれ表す。)
所望のリターデーションは、フィルム作製時の延伸倍率やリターデーション上昇剤の添加量、セルロースエステルのアシル基の種類及び置換度、フィルムの膜厚などを制御することで調整することができる。
(a2) 0.72≦Ro(450)/Ro(550)≦0.96
(a3) 0.83≦Ro(550)/Ro(650)≦0.97
Ro(550)が、式(a1)を満たす光学フィルムは、λ/4位相差フィルムとして好ましく機能し得る。なかでも、120nm≦Ro(550)≦160nmを満たすことがより好ましく、130nm≦Ro(550)≦150nmを満たすことがさらに好ましい。
(a5)0≦Nz≦1
Nzが式(a5)を満たせば、厚さ方向の位相差値Rtが、面内方向の位相差値Roよりも相対的に小さいため、本発明の光学フィルムを具備する画像表示装置を斜め方向から観察したときの色味の変化を低減し得る。
本発明の光学フィルムは、溶液流延法又は溶融流延法で製造され得る。光学フィルムの着色や異物欠点、ダイライン等の光学欠点を抑制する観点では、溶液流延法が好ましく、光学フィルムに溶媒が残留するのを抑制する観点では、溶融流延法が好ましい。
セルロースエステルを含む光学フィルムを溶液流延法で製造する方法は、A1)少なくともセルロースエステルと、必要に応じて他の添加剤とを溶剤に溶解させてドープを調製する工程、A2)ドープを無端の金属支持体上に流延する工程、A3)流延したドープから溶媒を蒸発させてウェブとする工程、A4)ウェブを金属支持体から剥離する工程、A5)ウェブを乾燥後、延伸してフィルムを得る工程を含む。
溶解釜において、セルロースエステルと、必要に応じて他の添加剤とを溶剤に溶解させてドープを調製する。
ドープを、加圧ダイのスリットから無端状の金属支持体上に流延させる。
ウェブ(ドープを金属支持体上に流延して得られたドープ膜)を金属支持体上で加熱し、溶媒を蒸発させる。ウェブの乾燥方法や乾燥条件は、前述のA2)流延工程と同様とし得る。
金属支持体上で溶媒を蒸発させたウェブを、金属支持体上の剥離位置で剥離する。
なお、残留溶媒量を測定する際の加熱処理は、115℃で1時間の加熱処理を意味する。
金属支持体から剥離して得られたウェブを、必要に応じて乾燥させた後、延伸する。ウェブの乾燥は、ウェブを、上下に配置した多数のローラーにより搬送しながら乾燥させてもよいし、ウェブの両端部をクリップで固定して搬送しながら乾燥させてもよい。
本発明の光学フィルムを溶融流延法で製造する方法は、B1)溶融ペレットを製造する工程(ペレット化工程)、B2)溶融ペレットを溶融混練した後、押し出す工程(溶融押出し工程)、B3)溶融樹脂を冷却固化してウェブを得る工程(冷却固化工程)、B4)ウェブを延伸する工程(延伸工程)、を含む。
光学フィルムの主成分である熱可塑性樹脂を含む樹脂組成物は、あらかじめ混練してペレット化しておくことが好ましい。ペレット化は、公知の方法で行うことができ、例えば前述の熱可塑性樹脂と、必要に応じて可塑剤等の添加剤とを含む樹脂組成物を、押出機にて溶融混錬した後、ダイからストランド状に押し出す。ストランド状に押し出された溶融樹脂を、水冷又は空冷した後、カッティングしてペレットを得ることができる。
得られた溶融ペレットと、必要に応じて他の添加剤とを、ホッパーから押出機に供給する。ペレットの供給は、ペレットの酸化分解を防止するため等から、真空下、減圧下又は不活性ガス雰囲気下で行うことが好ましい。そして、押出機にて、フィルム材料である溶融ペレット、必要に応じて他の添加剤を溶融混練する。
ダイから押し出された樹脂を、冷却ローラーと弾性タッチローラーとでニップして、フィルム状の溶融樹脂を所定の厚さにする。そして、フィルム状の溶融樹脂を、複数の冷却ローラーで段階的に冷却して固化させる。
得られたウェブを、延伸機にて延伸してフィルムを得る。延伸は、ウェブの幅方向、搬送方向又は斜め方向のいずれかに行う。
本発明に係る光学フィルムは、本発明の偏光板、それを用いた本発明の液晶表示装置に使用することができる。本発明に係る光学フィルムは、偏光板保護フィルムの機能を兼ねたフィルムとされることが好ましく、その場合偏光板保護フィルムと別に位相差を有する光学フィルムを別途用意する必要がないため、液晶表示装置の厚さを薄く製造プロセスを簡略化することができる。
図1は液晶表示装置の構成の一例を示す模式図である。図1に示す形態において、位相差フィルム105と偏光子104とは活性エネルギー線硬化性接着剤103Bを介して接着されている。活性エネルギー線硬化性接着剤を用いることが透湿性を効果的に制御できることから好ましい。ただし、本発明においては、活性エネルギー線硬化性接着剤のみならず、ウレタン系粘着剤、エポキシ系粘着剤、水性高分子-イソシアネート系粘着剤、熱硬化型アクリル粘着剤等の硬化型粘着剤、湿気硬化ウレタン粘着剤、ポリエーテルメタクリレート型、エステル系メタクリレート型、酸化型ポリエーテルメタクリレート等の嫌気性粘着剤、シアノアクリレート系の瞬間粘着剤、アクリレートとペルオキシド系の2液型瞬間粘着剤などを用いることができる。上記粘着剤としては1液型であってもよいし、使用前に2液以上を混合して使用する2液型であってもよい。接着剤は、有機溶剤を媒体とする溶剤系であってもよいし、水を主成分とする媒体であるエマルジョン型、コロイド分散液型、水溶液型等の水系であってもよいし、無溶剤型であってもよい。接着剤液の濃度は、接着後の膜厚、塗布方法、塗布条件等により適宜決定されれば良く、通常は0.1~50質量%である。
活性エネルギー線硬化性接着剤の好ましい例としては、例えば、特開2011-028234号公報に開示されているような、(α)カチオン重合性化合物、(β)光カチオン重合開始剤、(γ)380nmより長い波長の光に極大吸収を示す光増感剤、及び(δ)ナフタレン系光増感助剤の各成分を含有する活性エネルギー線硬化性接着剤組成物が挙げられる。ただし、これ以外の活性エネルギー線硬化性接着剤組成物が用いられても、もちろんよい。
前処理工程では、偏光子と接着する位相差フィルムの表面が易接着処理される。偏光子の両面にそれぞれ位相差フィルム及び保護フィルムが接着される場合は、位相差フィルム及び保護フィルムのそれぞれに対し易接着処理が行われる。次の接着剤塗布工程では、易接着処理された表面が偏光子との貼合面として扱われるので、位相差フィルムの両表面のうち、活性エネルギー線硬化性接着剤と貼合する面に、易接着処理を施す。易接着処理としては、コロナ処理、プラズマ処理等が挙げられる。
接着剤塗布工程では、偏光子と位相差フィルムとの接着面のうち少なくとも一方に、上記活性エネルギー線硬化性接着剤が塗布される。偏光子又は位相差フィルムの表面に直接、活性エネルギー線硬化性接着剤を塗布する場合、その塗布方法に特別な限定はない。例えば、ドクターブレード、ワイヤーバー、ダイコーター、カンマコーター、グラビアコーター等、種々の湿式塗布方式が利用できる。また、偏光子と位相差フィルムの間に、活性エネルギー線硬化性接着剤を流延させたのち、ローラー等で加圧して均一に押し広げる方法も利用できる。
上記の方法により活性エネルギー線硬化性接着剤を塗布した後は、貼合工程で処理される。この貼合工程では、例えば、先の塗布工程で偏光子の表面に活性エネルギー線硬化性接着剤を塗布した場合、そこに位相差フィルムが重ね合わされる。先の塗布工程で位相差フィルムの表面に活性エネルギー線硬化性接着剤を塗布した場合は、そこに偏光子が重ね合わされる。また、偏光子と位相差フィルムの間に活性エネルギー線硬化性接着剤を流延させた場合は、その状態で偏光子と位相差フィルムとが重ね合わされる。偏光子の両面に位相差フィルム及び保護フィルムを接着する場合であって、両面とも活性エネルギー線硬化性接着剤用いる場合は、偏光子の両面にそれぞれ、活性エネルギー線硬化性接着剤を介して位相差フィルム及び保護フィルムが重ね合わされる。そして通常は、この状態で両面(偏光子の片面に位相差フィルムを重ね合わせた場合は、偏光子側と位相差フィルム側、また偏光子の両面に位相差フィルム及び保護フィルムを重ね合わせた場合は、その両面の位相差フィルム及び保護フィルム側)からローラー等で挟んで加圧することになる。ローラーの材質は、金属やゴム等を用いることが可能である。両面に配置されるローラーは、同じ材質であってもよいし、異なる材質であってもよい。
硬化工程では、未硬化の活性エネルギー線硬化性接着剤に活性エネルギー線を照射して、カチオン重合性化合物(例えば、エポキシ化合物やオキセタン化合物)やラジカル重合性化合物(例えば、アクリレート系化合物、アクリルアミド系化合物等)を含む活性エネルギー線硬化性接着剤を硬化させ、活性エネルギー線硬化性接着剤を介して重ね合わせた偏光子と位相差フィルム、あるいは偏光子と位相差フィルムとを接着させる。偏光子の片面に位相差フィルムを貼合する場合、活性エネルギー線は、偏光子側又は位相差フィルム側のいずれから照射してもよい。また、偏光子の両面に位相差フィルム及び保護フィルムを貼合する場合、偏光子の両面にそれぞれ活性エネルギー線硬化性接着剤を介して位相差フィルム及び保護フィルムを重ね合わせた状態で、活性エネルギー線を照射し、両面の活性エネルギー線硬化性接着剤を同時に硬化させるのが有利である。
本発明の光学フィルムを用いた偏光板を液晶表示装置に用いることによって、種々の視認性に優れた本発明の画像表示装置を作製することができる。
本発明の円偏光板は、偏光子(直線偏光膜)と、その少なくとも一方の面上に配置された本発明の光学フィルムとを備える。本発明の光学フィルムは、偏光子に直接貼り合わされてもよいし、他の層又はフィルムを介して配置されてもよい。
本発明の画像表示装置は、本発明の光学フィルムが具備されている。本発明の画像表示装置の例には、有機EL表示装置や液晶表示装置等が含まれる。
本発明の樹脂組成物は、光学レンズに用いることができる。光学レンズを構成する樹脂は、水吸着性樹脂である。好ましい水吸着性樹脂としては、アクリル樹脂(ポリメタクリル酸メチル等)、ポリエステル(ポリエチレンテレフタラート等)、ポリアミド(ナイロン等)、ポリカーボネート、セルロース誘導体(セルロースアセテート、エチルセルロース等)等が挙げられる。中でも、アクリル樹脂又はセルロース誘導体であることが好ましい。
以下に各種の混合液を作製して、本発明に係る添加剤Nと水吸着性樹脂のCH/π相互作用を確認した。
重アセトン1mlにアセチル基置換度2.4、数平均分子量200000のセルロースアセテート樹脂0.1g及びテトラメチルシラン3滴を加え、室温下12時間撹拌し、完溶させた。
重アセトン1mlにアセチル基置換度2.4、数平均分子量200000のセルロースアセテート樹脂0.1g、酢酸0.1g及びテトラメチルシラン3滴を加え、室温下12時間撹拌し、完溶させた。
重アセトン1mlにアセチル基置換度2.4、数平均分子量200000のセルロースアセテート樹脂0.1g、トリエチルアミン0.1g及びテトラメチルシラン3滴を加え、室温下12時間撹拌し、完溶させた。
重アセトン1mlにアセチル基置換度2.4、数平均分子量200000のセルロースアセテート樹脂0.1g、例示化合物6を0.1g及びテトラメチルシラン3滴を加え、室温下12時間撹拌し、完溶させた。
混合液1~4の1H-NMRを測定した結果を下記に示す。なお、1H-NMRのケミカルシフトは、内部標準として用いたテトラメチルシランを基準(0ppm)として算出した。
〔光学フィルム101の作製〕
下記成分を、ディゾルバーで50分間撹拌混合した後、マントンゴーリンで分散させて、微粒子分散液を調製した。
微粒子(アエロジル R972V 日本アエロジル(株)製):
11質量部
エタノール: 89質量部
下記微粒子添加液の成分のうち、メチレンクロライドを溶解タンクに投入し、調製した微粒子分散液を下記の添加量で、十分撹拌しながらゆっくりと添加した。次いで、微粒子の二次粒子の粒径が所定の大きさとなるようにアトライターにて分散させた後、ファインメットNF(日本精線(株)製)でろ過して、微粒子添加液を得た。
メチレンクロライド: 99質量部
微粒子分散液: 5質量部
下記主ドープの成分のうち、メチレンクロライドとエタノールを加圧溶解タンクに投入した。次いで、下記セルロース誘導体C1、糖エステルS、例示化合物1及び調製した微粒子添加液を撹拌しながら投入し、加熱、撹拌して完全に溶解させた。得られた溶液を、安積濾紙(株)製の安積濾紙No.244を使用してろ過し、主ドープを調製した。
メチレンクロライド: 520質量部
エタノール: 45質量部
セルロース誘導体C1: 100質量部
糖エステルS: 5質量部
例示化合物1:(一般式(1)で表される化合物) 3質量部
微粒子添加液: 1質量部
以下に、可塑剤として加えた糖エステルSの構造を示す。
光学フィルム1の作製において、セルロース誘導体の種類及び添加量、他の樹脂の種類及び添加量、糖エステル等の可塑剤の種類及び添加量、前記一般式(1)で表される化合物又は比較化合物の種類及び、延伸倍率、延伸後の光学フィルムの膜厚を、下記表3~表5に示すように変更した以外は、同様の方法で光学フィルム102~209を作製した。光学フィルムの膜厚は、ドープの流量を変化させることによって調整した。
冷却凝縮器を装着した反応器に、236質量部のエチレングリコール、683質量部の1,4-ブチレングリコール、1180質量部のコハク酸、0.03質量部のテトラブチルチタネートを投入し、140℃で2時間、220℃で2時間、冷却凝縮器を外して220℃でさらに20時間、脱水縮合反応を行って、数平均分子量2000のポリエステル(A1)を得た。これに使用したグリコールの炭素数の平均は3.33、二塩基酸の炭素数は4であった。
反応容器にフタル酸410部、安息香酸610部、ジプロピレングリコール737部、及び触媒としてテトライソプロピルチタネート0.40部を一括して仕込み窒素気流中で撹拌下、還流凝縮器を付して過剰の1価アルコールを還流させながら、酸価が2以下になるまで130~250℃で加熱を続け生成する水を連続的に除去した。次いで200~230℃で100~最終的に4.00MPa以下の減圧下、留出分を除去し、この後濾過して次の性状を有する芳香族末端ポリエステルを得た。
酸価 ;0.2mgKOH/g
(芳香族末端エステル化合物P2の合成)
1,2-プロピレングリコール251g、無水フタル酸278g、アジピン酸91g、安息香酸610g、エステル化触媒としてテトライソプロピルチタネート0.191gを、温度計、撹拌器、緩急冷却管を備えた2Lの四つ口フラスコに仕込み、窒素気流中230℃になるまで、撹拌しながら徐々に昇温する。15時間脱水縮合反応させ、反応終了後200℃で未反応の1,2-プロピレングリコールを減圧留去することにより、芳香族末端エステル化合物P2を得た。酸価は0.10、数平均分子量は450であった。
1,2-プロピレングリコール251g、テレフタル酸354g、安息香酸610g、エステル化触媒としてテトライソプロピルチタネート0.191gを、温度計、撹拌器、緩急冷却管を備えた2Lの四つ口フラスコに仕込み、窒素気流中230℃になるまで、撹拌しながら徐々に昇温する。15時間脱水縮合反応させ、反応終了後200℃で未反応の1,2-プロピレングリコールを減圧留去することにより、芳香族末端エステル化合物P3を得た。酸価は0.10、数平均分子量は400であった。
上記作製した各光学フィルムについて、下記の各特性値の測定及び評価を行った。
作製した光学フィルムについて、温度23℃、相対湿度55%の環境下で、光波長590nmで、自動複屈折計KOBRA-21ADH(王子計測機器)を用いて下記式で表されるリターデーション値Ro、Rtを測定した。
式(II):Rt(590)={(nx+ny)/2-nz}×d
〔式(I)及び式(II)において、nxは、フィルムの面内方向において屈折率が最大になる方向xにおける屈折率を表す。nyは、フィルムの面内方向において、前記方向xと直交する方向yにおける屈折率を表す。nzは、フィルムの厚さ方向zにおける屈折率を表す。dは、フィルムの厚さ(nm)を表す。〕
(湿度変動によるリターデーション値の測定)
(水浸漬によるリターデーション値の測定)
下記のようにして、湿度変動によるリターデーション値の測定を行った。なお、下記の操作は全て、温度23℃、相対湿度55%の環境下で行った。
ΔRt=|Rt1-Rt2|
また、本発明の化合物及び比較化合物のリターデーション値変動抑制効果を以下の式で求められる変動抑制率(%)として評価した。
Rt変動抑制率(%)=((基準フィルムのΔRt)-(各サンプルフィルムのΔRt))÷(基準フィルムのΔRt)×100
また、本発明に係る化合物及び比較化合物のリターデーション値変動抑制効果を以下の式で求められる変動抑制率(%)として評価した。
PMMA1:ポリメタクリル酸メチル(重量平均分子量:280000)
PMMA2:ポリメタクリル酸メチル(重量平均分子量:2500)
P2:芳香族末端エステル化合物P2
P3:芳香族末端エステル化合物P3
比較1:比較化合物1(ポリエステル化合物A1)
比較2:比較化合物2(芳香族末端エステル化合物P1)
比較3:比較化合物3
比較4:比較化合物4
比較5:比較化合物5
比較6:比較化合物6
比較7:比較化合物7
比較8:比較化合物8
比較9:比較化合物9
比較10:比較化合物10
比較11:比較化合物11
また、表中一般式(1)で表される化合物の種類の欄の番号は〔化15〕~〔化89〕に記載の例示化合物1~695の番号に対応している。
《樹脂組成物の作製》
〔樹脂組成物201の作製〕
下記主ドープの成分のうち、メチレンクロライドとエタノールを加圧溶解タンクに投入した。次いで、下記セルロース誘導体C1、例示化合物1を撹拌しながら投入し、加熱、撹拌して完全に溶解させた。得られた溶液を、安積濾紙(株)製の安積濾紙No.244を使用してろ過し、主ドープを調製した。
メチレンクロライド: 520質量部
エタノール: 45質量部
セルロース誘導体C1: 100質量部
例示化合物1: 5質量部
得られたドープを、無端ベルト流延装置を用いて、ステンレスベルト支持体上に均一に流延させた。ステンレスベルト支持体上で、流延(キャスト)したドープ膜中の溶媒を、残留溶媒量が75%になるまで蒸発させ、得られたウェブをステンレスベルト支持体上から剥離した。剥離したウェブを、テンター延伸装置のクリップで把持しながら搬送した。次いで、得られたフィルムを、乾燥ゾーン内で、多数のローラーで搬送させながら乾燥させた。テンタークリップで把持していたフィルムの幅方向端部をレーザーカッターでスリット除去した後、巻き取って原反フィルムを得た。
下記表の組成のように、樹脂及び例示化合物の種類を変えた以外は同様にして、樹脂組成物202~223を得た。膜厚はいずれも60μmであった。
上記で作製した各サンプルを、23℃、20%RHの環境下で24時間調湿し、同環境下、590nmの光源を用いて、アッベ屈折計(4T)により平均屈折率n1を測定した。
〔光学フィルム301の作製〕
下記主ドープの成分のうち、メチレンクロライドとエタノールを加圧溶解タンクに投入した。次いで、下記セルロース誘導体C1、例示化合物1を撹拌しながら投入し、加熱、撹拌して完全に溶解させた。得られた溶液を、安積濾紙(株)製の安積濾紙No.244を使用してろ過し、主ドープを調製した。
メチレンクロライド: 520質量部
エタノール: 45質量部
セルロース誘導体C1: 100質量部
例示化合物1: 5質量部
得られたドープを、無端ベルト流延装置を用いて、ステンレスベルト支持体上に均一に流延させた。ステンレスベルト支持体上で、流延(キャスト)したドープ膜中の溶媒を、残留溶媒量が75%になるまで蒸発させ、得られたウェブをステンレスベルト支持体上から剥離した。剥離したウェブを、テンター延伸装置のクリップで把持しながら搬送した。次いで、得られたフィルムを、乾燥ゾーン内で、多数のローラーで搬送させながら乾燥させた。テンタークリップで把持していたフィルムの幅方向端部をレーザーカッターでスリット除去した後、巻き取って光学フィルムを得た。
下記表9の組成のように、例示化合物の種類を変えた以外は同様にして、光学フィルム302~309を得た。膜厚はいずれも60μmであった。
23℃55%RHの環境下で各フィルムの厚さ方向の位相差値Rt1を測定した。次に、各フィルムを80℃、90%RHで1000時間、湿熱耐久試験を行い、その後、23℃55%RHの環境下で厚さ方向の位相差値Rt2を測定した。
《偏光板の作製》
〔偏光板101の作製〕
(偏光子の作製)
厚さ30μmのポリビニルアルコールフィルムを、35℃の水で膨潤させた。得られたフィルムを、ヨウ素0.075g、ヨウ化カリウム5g及び水100gからなる水溶液に60秒間浸漬し、さらにヨウ化カリウム3g、ホウ酸7.5g及び水100gからなる45℃の水溶液に浸漬した。得られたフィルムを、延伸温度55℃、延伸倍率5倍の条件で一軸延伸した。この一軸延伸フィルムを、水洗した後、乾燥させて、厚さ10μmの偏光子を得た。
下記の各成分を混合した後、脱泡して、活性エネルギー線硬化性接着剤液を調製した。なお、トリアリールスルホニウムヘキサフルオロホスフェートは、50%プロピレンカーボネート溶液として配合し、下記にはトリアリールスルホニウムヘキサフルオロホスフェートの固形分量を表示した。
ンカルボキシレート 45質量部
エポリードGT-301(ダイセル化学社製の脂環式エポキシ樹脂)
40質量部
1,4-ブタンジオールジグリシジルエーテル 15質量部
トリアリールスルホニウムヘキサフルオロホスフェート 2.3質量部
9,10-ジブトキシアントラセン 0.1質量部
1,4-ジエトキシナフタレン 2.0質量部
(偏光板101の作製)
下記の方法に従って、図1の偏光板101Aの構成からなる偏光板101を作製した。カッコ内の数値は、図1に記載した各構成要素の番号を示す。
偏光板101の作製において、光学フィルム101を光学フィルム102~121、166~184に変更したこと以外は同様にして、偏光板102~140を作製した。
市販のVA型液晶表示装置(SONY製40型ディスプレイKLV-40J3000)を用い、液晶セルの両面に貼合されていた偏光板を剥離し、上記作製した偏光板101~140を、図1で示すように液晶セルの両面に貼合して液晶表示装置101~140を作製した。その際、偏光板の吸収軸の向きはあらかじめ貼合されていた偏光板と同じ向きに調整した。
上記作製した各液晶表示装置について、下記の評価を行った。
上記作製した液晶表示装置表面に水を浸したベンコット(旭化成せんい社製)を乗せ、水分が蒸発しない状態で30時間保持した。次いで、各液晶表示装置を点灯し、表示画面の均一性を目視評価し、下記の基準に従って耐湿性の評価を行った。
B:僅かに弱い色ムラの発生が認められる
C:弱い色ムラの発生が認められるが、実用上問題のない品質である
D:色ムラの発生が認められる
E:強い色ムラが発生し、耐湿性に問題のある品質である
〔円偏光板201の作製〕
(偏光子の作製)
厚さ120μmのポリビニルアルコールフィルムを、延伸温度110℃、延伸倍率5倍の条件で一軸延伸した。得られたフィルムを、ヨウ素0.075g、ヨウ化カリウム5g、水100gからなる水溶液に60秒間浸漬した。次いで、ヨウ化カリウム6g、ホウ酸7.5g、水100gからなる68℃の水溶液に浸漬し、水洗、乾燥して厚さ20μmの偏光子を得た。
円偏光板201の作製において、光学フィルム201を、光学フィルム202~204に変更した以外は、円偏光板201と同様にして円偏光板202~204をそれぞれ作製した。
ガラス基板上に、スパッタリング法により、厚さ80nmのクロムからなる光反射電極を形成した。この光反射電極上に、陽極として厚さ40nmのITOの薄膜を形成した。次いで、この陽極上に、スパッタリング法により、厚さ80nmのポリ(3,4-エチレンジオキシチオフェン)-ポリスチレンスルホネート(PEDOT:PSS)からなる正孔輸送層を形成した。さらに、正孔輸送層上に、シャドーマスクを用いて、RGBの発光層をそれぞれパターニングして形成した。発光層の厚さは、色毎に100nmとした。赤色発光層は、ホストとしてトリス(8-ヒドロキシキノリナート)アルミニウム(Alq3)と発光性化合物[4-(dicyanomethylene)-2-methyl-6(p-dimethylaminostyryl)-4H-pyran](DCM)とを共蒸着(質量比99:1)して形成し、緑色発光層は、ホストとしてAlq3と、発光性化合物クマリン6とを共蒸着(質量比99:1)して形成した。青色発光層は、ホストとして下記化合物BAlqと発光性化合物Peryleneとを共蒸着(質量比90:10)して形成した。
有機EL表示装置201作製において、円偏光板201を各円偏光板202~204に変更した以外は、有機EL表示装置201と同様にして有機EL表示装置202~204をそれぞれ作製した。
上記作製した各有機EL表示装置について、下記の評価を行った。
上記作製した有機EL表示装置表面に水を浸したベンコット(旭化成せんい社製)を乗せ、水分が蒸発しない状態で30時間保持した。次いで、各有機EL表示装置を点灯し、表示画面の均一性を目視評価し、下記の基準に従って耐湿性の評価を行った。
B:僅かに弱い色ムラの発生が認められる
C:弱い色ムラの発生が認められるが、実用上問題のない品質である
D:色ムラの発生が認められる
E:強い色ムラが発生し、耐湿性に問題のある品質である
実施例2の光学フィルム1の作製において、セルロース誘導体の種類及び添加量、可塑剤、前記一般式(1)で表される化合物又は比較化合物の種類、及び、延伸倍率、延伸後の光学フィルムの膜厚を、下記表12に示すように変更した以外は、同様の方法で光学フィルム401~405を作製した。光学フィルムの膜厚は、ドープの流量を変化させることによって調整した。なお、光学フィルム401~405は、原反フィルムのガラス転移温度Tg+20℃の延伸温度、2.2倍の延伸倍率にて、フィルムの搬送方向に対し45°傾斜した斜め方向に延伸して作製した。得られた光学フィルム401~405の面内の遅相軸とフィルムの搬送方向とのなす角度はいずれも45°だった。
上記作製した各光学フィルムについて、実施例2と同様にリターデーション値、水浸漬によるリターデーション値を行い、Ro変動抑制率(%)の測定の測定を行った。
〔偏光板401~405作製〕
実施例6において円偏光板201の作製において、光学フィルム201を光学フィルム401~405に変更したこと以外は同様にして、円偏光板401~405を作製した。
実施例6の有機EL表示装置201の作製において、円偏光板201の代わりに円偏光板401~405を用いて、有機EL表示装置157と同様にして有機EL表示装置401~405をそれぞれ作製した。
実施例6と同様にして、有機EL表示装置の色ムラを評価した。
評価結果を表13に示す。
102 保護フィルム
103A、103B 活性エネルギー線硬化性接着剤
104 偏光子
105 位相差フィルム
106 保護フィルム
107 液晶セル
108 液晶表示装置
BL バックライト
10 有機EL表示装置
12 光反射電極
14 発光層
16 透明電極層
18 透明基板
20 円偏光板
20A λ/4位相差フィルム
20B 偏光子(直線偏光膜)
a1、b1、b3、b4 直線偏光
c1、c2、c3、c4 円偏光板
30 液晶表示装置
40 液晶セル
50、60 偏光板
52、62 偏光子
54、56、64、66 保護フィルム
70 バックライト
V 視認側
Claims (24)
- 少なくとも樹脂と5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物とを含有する樹脂組成物であって、前記樹脂が、水吸着性樹脂であって、かつ前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物が、ベンゼン環よりNICS値が小さい又は等しい5員若しくは6員の芳香族炭化水素環又は芳香族複素環のいずれかを少なくとも三つ有し、そのうちの少なくとも一つはベンゼン環よりNICS値が小さく、かつ、前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環が、相互に単結合又は2個以下の原子を介して連結された化合物であることを特徴とする樹脂組成物。
- 前記樹脂組成物を用いて作製された光学フィルムのリターデーション値(Ro値又はRt値)の変動抑制率が、下記測定条件下で、20~100%の範囲内であることを特徴とする請求項1に記載の樹脂組成物。
測定条件:
(a)作製した前記光学フィルム(サンプルフィルム)と同一膜厚で、かつ前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物を含まない光学フィルム(基準フィルム)を、サンプルフィルムと同様に作製し、
(b)前記サンプルフィルムと基準フィルムとを温度23℃の純水中に24時間水浸漬する。
(c)前記サンプルフィルムと基準フィルムについて、温度23℃、相対湿度55%における光波長590nmでのリターデーション値Ro値及びRt値を、水浸漬前と後に、測定し、水浸漬前後のリターデーション値の差の絶対値ΔRo及びΔRtをそれぞれの光学フィルムについて求める。
(d)下式により、リターデーション値(Ro値及びRt値)の変動抑制率を求める。
Ro変動抑制率(%)=((基準フィルムのΔRo)-(サンプルフィルムのΔRo))÷(基準フィルムのΔRo)×100
Rt変動抑制率(%)=((基準フィルムのΔRt)-(サンプルフィルムのΔRt))÷(基準フィルムのΔRt)×100 - 前記水吸着性樹脂の23℃における吸水率が、0.5~10質量%の範囲内であることを特徴とする請求項1又は請求項2に記載の樹脂組成物。
- 前記水吸着性樹脂が、セルロース誘導体であることを特徴とする請求項1から請求項3までのいずれか一項に記載の樹脂組成物。
- 前記水吸着性樹脂が、セルロースエステルであることを特徴とする請求項1から請求項4までのいずれか一項に記載の樹脂組成物。
- 前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物が、ベンゼン環よりもNICS値が小さい芳香族環として、ピロール環、ピラゾール環、イミダゾール環、1,2,3-トリアゾール環又は1,2,4-トリアゾール環を有することを特徴とする請求項1から請求項5までのいずれか一項に記載の樹脂組成物。
- 前記L1、L2、L3及びL4が、それぞれ独立に単結合を表すことを特徴とする請求項7に記載の樹脂組成物。
- 前記T1及びT2が、それぞれ独立に、ピラゾール環を表すことを特徴とする請求項7又は請求項8に記載の樹脂組成物。
- 請求項1から請求項12までのいずれか一項に記載の樹脂組成物を用いて作製されたことを特徴とする光学フィルム。
- 前記5員若しくは6員の芳香族炭化水素環又は芳香族複素環を有する化合物の添加量が前記樹脂に対して1~15質量%の範囲内であることを特徴とする請求項13に記載の光学フィルム。
- 23℃、55%RHの環境下で、光波長590nmにおける、下記式(I)で表される面内方向のリターデーション値Roが、40~100nmの範囲内、下記式(II)で表される厚さ方向のリターデーション値Rtが、100~300nmの範囲内であることを特徴とする、請求項13又は請求項14に記載の光学フィルム。
式(I) Ro=(nx-ny)×d
式(II) Rt={(nx+ny)/2-nz}×d
(式中、nxは、光学フィルムの面内方向において屈折率が最大になる方向xにおける屈折率を表し、nyは、光学フィルムの面内方向において、前記方向xと直交する方向yにおける屈折率を表し、nzは、光学フィルムの厚さ方向zにおける屈折率を表し、dは、光学フィルムの厚さ(nm)を表す。) - 23℃、55%RHの環境下で、光波長450nm、550nm及び650nmにおける面内方向の位相差値Roを、それぞれRo(450)、Ro(550)及びRo(650)としたとき、当該Ro(450)、Ro(550)及びRo(650)が、下記式(a1)~(a3)を満たすことを特徴とする請求項13から請求項15までのいずれか一項に記載の光学フィルム。
(a1)110≦Ro(550)≦170
(a2)0.72≦Ro(450)/Ro(550)≦0.96
(a3)0.83≦Ro(550)/Ro(650)≦0.97 - 請求項13から請求項16までのいずれか一項に記載の光学フィルムが、偏光子の少なくとも一方の面に備えられていることを特徴とする偏光板。
- 請求項13から請求項16までのいずれか一項に記載の光学フィルムが、偏光子の少なくとも一方の面に備えられていることを特徴とする円偏光板。
- 請求項15又は請求項16に記載の光学フィルムが、備えられていることを特徴とする画像表示装置。
- 前記画像表示装置が、液晶セルの少なくとも一方の面に請求項17に記載の偏光板が備えられている液晶表示装置であることを特徴とする請求項19に記載の画像表示装置。
- 前記液晶セルが、VA型液晶セルであることを特徴とする請求項20に記載の画像表示装置。
- 前記画像表示装置が、有機エレクトロルミネッセンス素子に請求項18に記載の円偏光板が備えられている有機エレクトロルミネッセンス表示装置であることを特徴とする請求項19に記載の画像表示装置。
- 請求項1から請求項12までのいずれか一項に記載の樹脂組成物を用いて作製されることを特徴とする光学レンズ。
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EP2944676A4 (en) | 2016-11-09 |
JP6292328B2 (ja) | 2018-03-14 |
JP6252492B2 (ja) | 2017-12-27 |
EP2944676A1 (en) | 2015-11-18 |
KR101807928B1 (ko) | 2018-01-18 |
CN107935949A (zh) | 2018-04-20 |
KR20150090234A (ko) | 2015-08-05 |
JP2017128580A (ja) | 2017-07-27 |
US20150338563A1 (en) | 2015-11-26 |
JPWO2014109350A1 (ja) | 2017-01-19 |
TWI572600B (zh) | 2017-03-01 |
CN104903406B (zh) | 2018-06-08 |
US10012777B2 (en) | 2018-07-03 |
US20180203175A1 (en) | 2018-07-19 |
CN104903406A (zh) | 2015-09-09 |
TW201439086A (zh) | 2014-10-16 |
CN107935949B (zh) | 2021-05-07 |
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