WO2003081299A1 - Film optique et son procede de production - Google Patents
Film optique et son procede de production Download PDFInfo
- Publication number
- WO2003081299A1 WO2003081299A1 PCT/JP2003/003506 JP0303506W WO03081299A1 WO 2003081299 A1 WO2003081299 A1 WO 2003081299A1 JP 0303506 W JP0303506 W JP 0303506W WO 03081299 A1 WO03081299 A1 WO 03081299A1
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- WIPO (PCT)
- Prior art keywords
- thermoplastic resin
- film
- cooling drum
- optical film
- temperature
- Prior art date
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Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3083—Birefringent or phase retarding elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/911—Cooling
- B29C48/9135—Cooling of flat articles, e.g. using specially adapted supporting means
- B29C48/914—Cooling of flat articles, e.g. using specially adapted supporting means cooling drums
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
- B29C48/9185—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling in the direction of the stream of the material
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/001—Combinations of extrusion moulding with other shaping operations
- B29C48/0018—Combinations of extrusion moulding with other shaping operations combined with shaping by orienting, stretching or shrinking, e.g. film blowing
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
- B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
- B29C48/23—Articles comprising two or more components, e.g. co-extruded layers the components being layers with means for avoiding adhesion of the layers, e.g. for forming peelable layers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/88—Thermal treatment of the stream of extruded material, e.g. cooling
- B29C48/918—Thermal treatment of the stream of extruded material, e.g. cooling characterized by differential heating or cooling
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
- B29K2995/00—Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
- B29K2995/0037—Other properties
- B29K2995/0072—Roughness, e.g. anti-slip
-
- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K2323/00—Functional layers of liquid crystal optical display excluding electroactive liquid crystal layer characterised by chemical composition
- C09K2323/03—Viewing layer characterised by chemical composition
- C09K2323/031—Polarizer or dye
Definitions
- the present invention relates to various films used for flat panel displays and the like, and optical films suitable as raw material films thereof, a method for producing the optical films, a polarizer protective film composed of the optical films, The present invention relates to a polarizing film having the protective film and a retardation film obtained by stretching the optical film.
- phase plate a material obtained by stretching a raw material film such as polycarbonate to have a certain letter size (also referred to as a phase difference) and laminating two or more sheets thereof is mainly used.
- polarizing plate a polarizing plate composed of a protective film laminated on the upper and lower surfaces of a polarizer made of polyvinyl alcohol is mainly used.
- a protective film of a polarizer a film obtained by a solution casting method of triacetyl cellulose is mainly used.
- a liquid crystal cell substrate film a film made of polyethylene terephthalate (PET) is mainly used.
- thermoplastic resin films are required to have higher optical distortion than ever before. It is becoming. If the optical distortion is large, it causes optical defects such as color unevenness and color loss of the entire flat panel display.
- the magnitude of retardation has been adopted as an index indicating the optical distortion of various thermoplastic resin films.
- the size of this letter Attempts have been made to reduce the optical distortion by reducing the value of to a small or predetermined value and making it uniform in the plane.
- a protective film for a polarizer it has been used as an index that the size of the retardation is small and constant over the entire surface of the film.
- TAC solution casting film has a relatively small letter size and is relatively constant in the film plane, but has poor productivity and completely removes the solvent during drying after solution casting.
- the volatile solvent adversely affects the electronic circuit and other parts of the flat panel display, causing malfunctions and display defects.
- Japanese Patent Application Laid-Open No. 2000-273204 discloses that a specific thermoplastic resin is melt-extruded under specific conditions to obtain a sheet thickness of 150 to 1000 / im and a sheet thickness tolerance (Rmax). ; u Q, sheet surface roughness 0.06 m, sheet surface retardation size (maximum value) is 15 nm, letter size is relatively constant and relatively small A technique for obtaining a sheet is disclosed.
- the technology disclosed in this publication is a technology for a thick sheet having a sheet thickness of 150 m or more.
- An object of the present invention is to eliminate the problem of residual solvent, to reduce optical distortion, and to eliminate the problem of color unevenness and color loss of a liquid crystal display obtained when used as a protective film for a polarizer.
- the present inventors have conducted intensive studies to solve the above-mentioned problems, and as a result, by optimizing the melt extrusion conditions and the operation conditions of the cooling drum, the size (R e) of the retardation of the obtained optical film has been reduced.
- the present inventors paid attention not only to the value of Re, but also to the direction of the slow axis indicating the direction. At each point, the direction in which birefringence is maximum is called the slow axis, and the direction in which it is minimum is called the fast axis.
- the present inventors have found that it is more important to control Re in relation to the angle a formed between the slow axis and the extrusion direction of the thermoplastic resin, rather than taking only Re and reducing it.
- the present invention has been completed based on these findings. That is, according to the present invention,
- An optical finolem composed of a thermoplastic resin film obtained using a melt extruder
- thermoplastic resin film forms an angle between an extrusion direction of the thermoplastic resin film from the melt extruder and a slow axis at each point, and c denotes a letter-difference size at each point.
- c denotes a letter-difference size at each point.
- the relationship of the following formula is An optical film characterized by being satisfactory is provided.
- the thermoplastic resin is an alicyclic structure-containing polymer.
- the optical film according to the present invention is preferably manufactured by, for example, the following manufacturing method.
- thermoplastic resin film comprising a step of externally contacting and cooling a molten thermoplastic resin extruded from an extruder to a first cooling drum, a second cooling drum, and a third cooling drum in this order.
- peripheral speed of the third cooling drum and R 3 (m / min), the ratio of the peripheral speed of the second cooling drum when the R 2 (m / min), and the R 3 and R 2 (R 3 / R 2 ) is set to 0.990 or more and less than 0.999 to provide a method for producing an optical film, wherein the thermoplastic resin is cooled.
- the resin contact time in the first cooling drum is (sec)
- the temperature at which the thermoplastic resin leaves the first cooling drum is T P l (° C)
- the thermoplastic resin is It is preferable that X (Tp—Tg) (unit: seconds' deg) when the glass transition temperature of the thermoplastic resin is Tg (° C.) is not less than 50 and not more than 20 to cool the thermoplastic resin.
- the ratio (R 2 ZRi) between R 2 and 1 ⁇ is set to 0.990 or more and less than 1.01 when the peripheral speed of the first cooling drum is (m / min). It is preferable to cool the thermoplastic resin.
- the T p 3 is 50 to 100 ° C. lower than the T g. It is preferable to cool the thermoplastic resin to a temperature.
- the Tp 2 when the temperature of the thermoplastic resin when leaving the second cooling drum is Tp 2 (° C), the Tp 2 is set to a temperature lower by 0 to 60 ° C than the Tg. Preferably, the thermoplastic resin is cooled.
- the temperature difference between the first cooling drum and the second cooling drum is It is preferable to cool the thermoplastic resin at a temperature of not more than ° C.
- a polarizer protective film composed of any one of the above optical films.
- a polarizing film comprising: a polarizer; and the above-mentioned protective film laminated on one or both sides of the polarizer via an adhesive layer.
- the optical film according to the present invention is composed of a thermoplastic resin film.
- the thermoplastic resin film used in the present invention contains at least a thermoplastic resin.
- the thermoplastic resin is not particularly limited as long as it is a resin generally used for producing an optical film.
- polyethylene terephthalate, polybutylene terephthalate and polymers containing an alicyclic structure are preferable because of high transparency and excellent film strength, and polymers containing an alicyclic structure are particularly preferable because they have a small retardation and are thin. preferable.
- the alicyclic structure-containing polymer is a polymer having a cyclic structure of a carbon-carbon saturated bond (referred to as “alicyclic structure” in the present invention) in a repeating unit.
- alicyclic structure a polymer having a cyclic structure of a carbon-carbon saturated bond (referred to as “alicyclic structure” in the present invention) in a repeating unit.
- Known polymers disclosed in Japanese Patent Application Laid-Open No. 2002-32102 can be used.
- a ring-opened polymer of a monomer having a norbornene ring structure (hereinafter referred to as “norbornenes”) and its hydrogenated product, an addition polymer of norbornene and its hydrogenated product, norbornene Addition copolymers with vinyl compounds and their hydrogenated products; polymers of aromatic vinyl hydrocarbon compounds such as polystyrene, in which the aromatic ring is hydrogenated; addition of monomers having an alicyclic structure and a butyl group Polymer, monomer having one or more unsaturated bonds in a carbon-carbon ring structure
- One addition polymer and a hydrogenated product thereof are exemplified.
- thermoplastic resin film used in the present invention in addition to the above-mentioned thermoplastic resin, various compounding agents may be compounded as necessary.
- the compounding agent is not particularly limited.
- stabilizers such as antioxidants, heat stabilizers, light stabilizers, weather stabilizers, ultraviolet absorbers, and near infrared absorbers
- resin modifiers such as lubricants and plasticizers
- coloring agents such as dyes and pigments
- antistatic agents can be used alone or in combination of two or more.
- the amount of the compounding agent is appropriately selected within a range and a range that does not impair the object of the present invention.
- the antioxidant examples include a phenol-based antioxidant, a phosphorus-based antioxidant, and a zeolite antioxidant. Among them, phenol-based antioxidants are preferred, and alkyl-substituted phenol-based acid inhibitors are particularly preferred.
- an antioxidant By including an antioxidant, the molded product (thermoplastic resin film) due to oxidative deterioration during molding can be formed without reducing the transparency and low water absorption of the thermoplastic resin film after melt extrusion molding described below. Color and strength can be prevented from lowering.
- the antioxidants can be used alone or in combination of two or more. The compounding amount of the antioxidant is appropriately selected within a range that does not impair the purpose of the present invention.
- thermoplastic resin film used in the present invention is produced by melt-extruding a molding material containing at least a thermoplastic resin. Specifically, first, for example, a thermoplastic resin and various compounding agents are mixed to form a molding material. Next, this molding material is processed into a raw material pellet suitable for melt extrusion molding. Next, this raw material pellet is supplied to a melt extruder, and processed into a film by a melt extrusion method to obtain a thermoplastic resin film.
- the melt extrusion method is a method in which raw material pellets are heated and melted in a cylinder, pressurized with a screw, and extruded from a die such as a T die into, for example, a film.
- a die such as a T die
- the thermoplastic resin in the molten state extruded from the die is transferred to a plurality of cooling drums by sequentially circumscribing them to a plurality of cooling drums, cooled during that time, and then subjected to necessary processes to form a thermoplastic resin film.
- the width of the thermoplastic resin film after passing through the cooling drum is 2 to 2 due to neck-in compared to the width of the molten thermoplastic resin immediately after being extruded from the die (the same as that of the die lip). 10% narrower.
- heat The end in the width direction of the plastic resin film (hereinafter, also simply referred to as “end”) is thicker and the optical distortion is larger than other parts of the film.
- thermoplastic resin film since the cooled thermoplastic resin film is used for optical applications, an appropriate portion of the end is usually cut off before winding by a winding drum. In the present invention, the portion that is cut off is referred to as “Mimi”. In the present invention, a portion of the unstretched thermoplastic resin film after cooling, from which the mimi portion is removed, is
- optical film When used in a state where the retardation size is close to zero, such as in a protective film or a liquid crystal substrate, remove the optical film from the unstretched thermoplastic resin film, take out the optical film, and wind it. Take up the drum.
- thermoplastic resin film used in the present invention is wound into a roll by a winding drum to form an optical film, which is then subjected to a stretching process and a lamination process with another film or the like. This can add value.
- the average thickness of the thermoplastic resin film used in the present invention is not particularly limited.
- the average thickness of the thermoplastic resin film is usually 100 ⁇ m or less. It is preferably 80 ⁇ m or less, particularly preferably 60 ⁇ or less.
- the average thickness of the thermoplastic resin film can be arbitrarily set by changing the feeding speed of the raw material pellets fed into the melt extruder, the rotation speed of the cooling drum, and both of them.
- thermoplastic resin film used in the present invention when an angle between the extrusion direction from the melt extruder and the slow axis at each point is ⁇ , and the magnitude of the letter decision at each point is Re, The following relationship is satisfied over the entire surface of the film.
- the linearly polarized light wavelength is a value for the center wavelength of visible light of 550 nm, but ⁇ is usually defined as the angle between the slow axis of the film and the optical axis of the linearly polarized light. Is done. However, there is no way to define ⁇ when testing the performance of an optical film alone. Therefore, the present inventors focused on the angle between the extrusion direction of the thermoplastic resin film, which is the base of the optical film, from the melt extruder and the slow axis at each point. Defined and substituted properties.
- the values of Re and E at each point described above can be measured using a phase difference meter or the like, and the Z value can be determined from these values.
- the maximum value of the Z value can be obtained by measuring over an appropriate length and measuring several points or more in the width direction, including the portion near the edge of the optical film. It can be adopted as a substitute value.
- the maximum value of Z values is usually 4. Must be a 0 X 1 0 one 5, preferably 3. 8 X 1 0- 5, more preferably from 3. 4 X 1 0- 5.
- the Z value is equal to or less than the predetermined value, the problem of color unevenness and color drop of the obtained liquid crystal display is further reduced, and the color unevenness and color drop out are not visually perceived, and the display quality is significantly improved. Preferred.
- the maximum value of Re is not particularly limited.
- the Re is preferably 10 nm or less, more preferably 7 nm or less, and still more preferably 5 nm or less over the entire surface of the film.
- the value of Re is equal to or less than a predetermined value, the problems of color unevenness and color drop of the obtained liquid crystal display are further reduced. Further, color unevenness and color loss after the durability test are further reduced, which is preferable.
- the value of Re can be measured by an optical method such as an ellipsometer.
- R e The maximum value is measured over an appropriate length, and in the width direction, a value obtained by measuring several points including the portion near the edge of the optical film is used as a substitute value. can do.
- the method for producing the optical film according to the present invention that satisfies the above conditions is not particularly limited.
- the proportion of the mimi portion in the entire film is made larger than in the conventional case so that the above condition is satisfied over the entire surface of the film.
- the proportion of the mimi portion is usually 3% or more for each of the left and right, preferably 5% or more for each of the left and right, particularly preferably 7% or more for each of the left and right, preferably 40% or less for each of the left and right, and particularly preferably. Is less than 20% on each side.
- the optical film of the present invention can be produced by optimizing the conditions from melt extrusion to winding of the thermoplastic resin film.
- the method for producing an optical film according to the present invention a step of externally contacting and cooling the thermoplastic resin in a molten state extruded from an extruder to a first cooling drum, a second cooling drum, and a third cooling drum in order Having.
- the method further includes a step of cutting both ends in the width direction of the thermoplastic resin after the cooling, and a step of winding the cut thermoplastic resin into a roll.
- thermoplastic resin is cooled so as to satisfy the following.
- R 3 and R 2 are The ratio (R 3 / R z) is preferably 0.990 or more and less than 0.999, more preferably 0.995 or more and less than 0.998 to cool the thermoplastic resin. . If the value of R 3 / R 2 is excessively large, the molten thermoplastic resin extruded from the extruder (hereinafter, also referred to as “sheet-like thermoplastic resin”) is stretched and the size of the retardation is reduced. The variation is undesirably large.
- the resin contact time in the first cooling drum is (sec), the temperature at which the thermoplastic resin leaves the first cooling drum is T pi (° C), and the glass of the thermoplastic resin is X (Tp -T g) when the transition temperature is T g (° C)
- thermoplastic resin is cooled by setting (unit: seconds' d e g) to preferably _50 or more and 20 or less, more preferably 140 or more and +15 or less.
- setting unit: seconds' d e g
- _50 or more and 20 or less more preferably 140 or more and +15 or less.
- the peripheral speed of the first cooling drum (m / min) and when the ratio of the R 2 and the 1 ⁇ a (R 2 / Ri), preferably 0.990 or higher 1. less than 01 It is more preferable that the thermoplastic resin be cooled to 0.995 or more and less than 1.000.
- the value of R 2 / Ri is in this range, the unevenness of the retardation of the obtained optical film becomes particularly small, and the winding film is hardly generated.
- thermoplastic resin when the temperature of it leaves the third cooling drum of the thermoplastic resin was T p 3 (° C), than the Tp 3 wherein Tg, preferably 50 to 100 ° C, more preferably The temperature is lowered to 60 to 80 ° C, and the thermoplastic resin is cooled.
- Tp 3 when the value of TP is in this range, the unevenness of the retardation size of the obtained optical film is particularly small, and winding dies are less likely to occur.
- the temperature Tp 3 to the upper above range may control the temperature of the third cooling drum and the second cooling drum.
- the temperature at which the thermoplastic resin leaves the second cooling drum is ⁇ 2
- T p 2 preferably Less than six 0 ° C, more preferably in the 2 0 ⁇ 4 0 ° C low temperature, cooling the thermoplastic resin I do.
- T p 2 is within this range, the unevenness of the retardation of the obtained optical film becomes particularly small, and the occurrence of winding defects is reduced.
- thermoplastic resin is cooled by setting the temperature difference between the first cooling drum and the second cooling drum to preferably 20 ° C. or less, more preferably 10 ° C. or less.
- the optical film according to the present invention is suitable as a protective film for a polarizer of a liquid crystal display.
- the polarizer can be obtained by doping iodine or the like into a finolem made of a bulcohol-based polymer such as polybier alcohol or partially formalized polybutanololecol, and then stretching the resultant.
- the optical film of the present invention may be laminated on one or both sides of the polarizer via a suitable adhesive layer as a protective film to form a polarizing film.
- a suitable adhesive layer an adhesive based on a suitable polymer such as an acrylic polymer, a silicone polymer, a polyester, a polyurethane, a polyether, or a synthetic rubber is used.
- the optical film of the present invention is used as a protective film when a polarizing film is produced by laminating the long polarizer with the longitudinal direction of the polarizer being aligned with the longitudinal direction (referred to as “roll-to-roll”). Suitable for material.
- the optical film of the present invention can be further stretched to obtain a retardation film.
- the retardation film is a film having a uniform retardation size over a whole surface of the retardation film at a predetermined value by stretching.
- Retardation films include retardation films of the wavelength of light to be used; L; 1 2; ⁇ / 4.
- a tenter is used for stretching the optical film of the present invention.
- the temperature of the film at the time of stretching is, for example, not less than (Tg ⁇ 100) ° C. and not more than (Tg + 40) ° C.
- T g is the glass transition temperature of the thermoplastic resin as a raw material.
- the stretching ratio depends on the value of the retardation to be obtained and the thickness of the retardation film, but is usually in the length (extending direction of the thermoplastic resin film) direction. 1.05 times or more and 3.0 times or less, 0.2 times or less in the width direction, and in some cases uniaxial stretching in the length direction.
- the film thickness was measured by measuring the film thickness at 1 place every 50 Omm over 1 Om (20 places) and at 5 places at equal intervals in the width direction (unit). : ⁇ ).
- the film length direction is 1 Om every 50 Omm! : (20 locations)
- Z values are calculated from ⁇
- Re unit: nm
- the Re and Z values are calculated from these values.
- the maximum value was determined.
- the measurement wavelength was 550 nm and the angle of incidence was 0 °.
- the total light transmittance of the optical film was measured by the direct-cross method according to JIS-K7105, and the average value was measured. It was calculated (unit:%). This value is ideally 0, but is good if it is less than 0.03%, and bad if it is more than 0.04%.
- the angle formed with the length direction is defined as ⁇ , which is a substitute characteristic.
- the polarizer was rotated at each measurement point, and the leakage of light in each direction in the film plane was confirmed.
- ⁇ indicates no light leakage at all
- ⁇ indicates almost no light leakage
- X indicates clearly observed light.
- the measurement was performed at 10 points over the length direction of the film every 10 O mm over 10 O m and at equal intervals in the width direction.
- Example 1 A test piece of 100 mm ⁇ 100 mm was cut out from the obtained optical film and subjected to a high-temperature / high-humidity durability promotion test at 100 ° C. and 90% RH for 100 hours. Thereafter, the test piece taken out was subjected to the same color unevenness test as in (4).
- Example 1 A test piece of 100 mm ⁇ 100 mm was cut out from the obtained optical film and subjected to a high-temperature / high-humidity durability promotion test at 100 ° C. and 90% RH for 100 hours. Thereafter, the test piece taken out was subjected to the same color unevenness test as in (4).
- Example 1 A test piece of 100 mm ⁇ 100 mm was cut out from the obtained optical film and subjected to a high-temperature / high-humidity durability promotion test at 100 ° C. and 90% RH for 100 hours. Thereafter, the test piece taken out was subjected to the same color unevenness test as in (4).
- the hydrogenated polymer is extruded in a molten state from an extruder into a strand and cooled. Thereafter, the mixture was pelletized to obtain a hydrogenated ring-opened polymer.
- This hydrogenated product had a glass transition temperature T g of 140 ° C.
- the pellet obtained is melt-extruded at a barrel temperature of 260 ° C using a single screw extruder (manufactured by Nippon Steel Works) with a cylinder inner diameter of 5 Omm and a screw L / D value of 28, and a die temperature of 260 ° C.
- a 65-mm wide sheet-like molten resin is extruded from the hanger die, and the first cooling drum (diameter 20 Omm, temperature T ⁇ : 135 ° C, peripheral speed: 14. 50mZ min) is adhered, immediately first cooling drum by a knife coater, followed by second cooling drum (diameter 3 5 0 mm, the temperature T 2: 1 2 5 ° C, circumferential speed R 2: 1 4.
- thermoplastic resin film having a width of 55 Omm (the neck-in was 5 Omm for each of the left and right sides).
- thermoplastic resin film was removed by removing 3 Omm from each end with a cutter, and the film was wound into a roll by a winding drum to obtain a roll-shaped optical film.
- the contact time ti of the sheet-like thermoplastic resin in the first cooling drum 3.1 (seconds), the resin temperature T P l when leaving the first cooling drum 1 3 2 (° C), a second cold the resin temperature T p 2 is 1 1 9 when leaving the retirement drum (° C), the resin temperature T p 3 of Rutoki leave the third cooling drum was 7 9 (° C).
- Table 1 shows the results of performing the above test items on the obtained optical film.
- Example 1 to produce an optical film similarly performed on 1 to 1 3 0 ° C, the exception that the T 2 to 1 2 0 ° C to the first embodiment.
- the contact time ti of the sheet-like thermoplastic resin on the first cooling drum is 3.1 (seconds), and the contact time ti when leaving the first cooling drum is The resin temperature Tpi is 1 28 (° C), the resin temperature Tp 2 when leaving the second cooling drum is 1 14 (° C), the resin temperature Tp 3 when leaving the third cooling drum is 77 (° C), ti X (Tp! -T g) was one 37 (unit: second 'deg). Table 1 shows the test results of the obtained optical films.
- Example 1 to produce an optical film similarly performed on the 140 ° C, the exception that the T 2 to 100 ° C (212 ° F) as in Example 1.
- the contact time t of the sheet-shaped heat thermoplastic resin in the first cooling drum 3.1 seconds
- the resin temperature T P l when leaving the first cooling drum 137 ° C
- the second cooling drum The resin temperature when leaving Tp 2 is 96 (° C)
- the resin temperature when leaving the third cooling drum Tp 3 is 75 (° C)
- t! X ( ⁇ one Tg) was one nine (unit: second 'deg).
- Table 1 shows the test results of the obtained optical films.
- Example 1 to produce an optical film similarly performed on 1 to 125 ° C, the exception that the T 2 to 120 ° C from Example 1.
- the contact time t of the sheet-shaped heat thermoplastic resin in the first cooling drum 3.1 (seconds), the resin temperature T P l when leaving the first cooling drum 123 (° C), the second cooling drum resin temperature Tp 2 1 15 when leaving the (° C), the resin temperature Tp 3 when leaving the third cooling drum 76 (° C), ti X (T one Tg! one 53 (in seconds 'deg).
- Table 1 shows the test results of the obtained optical films.
- Example 5 An optical finolem was manufactured in the same manner as in Comparative Example 2, except that the width of the ears was set to 15 O mm on each of the left and right sides. Table 1 shows the test results of the obtained optical films. This example is the result of an optical film that satisfies the requirements of the present invention obtained by changing the width of the mimi in comparison with the case of Comparative Example 2 and tested.
- Table 2 summarizes various conditions during film production.
- Example 1 135 125 10 80 132 119 79 3.1 14.50 14.46 14.40 0.996 0.997 140 -25
- Example 2 130 125 5 80 128 121 81 3,1 14.50 14.46 14.40 0.996 0.997 1 0 -37
- Example 3 130 120 10 80 128 114 77 3.1 14.50 14,46 14.40 0.996 0.997 140 -37
- Example 4 140 100 40 80 137 96 75 3.1 14.50 14.46 14.40 0.996 0.997 140 -9 Comparative Example 1 125 125 0 80 123 117 79 3.1 14.50 14.46 14.40 14.40 0.996 0.997 140 -9 Comparative Example 1 125 125 0 80 123 117 79 3.1 14.50 14.46 14.40 14.40 0.996 0.997 140 -9 Comparative Example 1 125 125 0 80 123 117 79 3.1 14.50 14.46 14.40 14.40 0.996 0.997 140 -9 Comparative Example 1 125 125 0 80 123 117 79
- the optical film of the example of the present invention has a smaller Z value than that of the comparative example, so that the total light transmittance, the degree of polarization, the color unevenness, and the color unevenness after the durability test are obtained. Both are excellent.
- the results of Examples 1 to 3 and 5 are smaller than the result of Example 4 in the maximum Re value, and thus are excellent in the results of the color unevenness and the simple liquid crystal display test.
- the results of Examples 1 to 3 are excellent in color unevenness after the durability test because the Z value is smaller than the results of Examples 4 and 5.
- the optical film obtained in the present invention can be subsequently formed into a retardation film by stretching.
- the retardation film is required to have a predetermined retardation (retardation value) and have a uniform value.
- the following test was conducted to examine the performance of the optical film of the present invention as a raw material film of the retardation film.
- the optical film obtained in the experiment was cut into pieces (width: 10 Omm, length: 15 Omm) to form test specimens.
- the film was stretched at a speed of 100 mmZ.
- the stretching ratio was adjusted so that the letter ratio would be 275 ⁇ 10 nm on average.
- Retardation was measured by the same measurement method as in (2), and the variation (difference between the maximum and minimum values) was divided by the average value to obtain Re unevenness.
- the measurement point was the center in the width direction, and 10 points near the center in the length direction were set at 10 points every 10 mm. Table 3 shows the results of measuring the Re unevenness after stretching for each of the experimental examples.
- Example 1 Example 2 Example 3 Example 4 Example 5 Comparative Example 1 Comparative Example 2 Re unevenness after stretching (%) 1.8 2.2 2.1 2.6 2.1 5.8 6.6
- the optical film of the example of the present invention has a smaller Z value than that of the comparative example, so that the retardation unevenness after the stretching process is small and excellent.
- Optical films are suitable as raw material films for retardation films.
- an optical film with small optical distortion is provided.
- the optical film of the present invention is useful as various optical films for flat panel displays such as protective films for polarizers and films for liquid crystal cell substrates.
- the optical film of the present invention has a force S that has a small retardation size and is uniform, and then has a predetermined retardation size by stretching, so that the value is uniform. Therefore, the optical film of the present invention is also useful as a raw material film such as a retardation film.
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Thermal Sciences (AREA)
- Optics & Photonics (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Physics & Mathematics (AREA)
- Polarising Elements (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Glass Compositions (AREA)
Description
Claims
Priority Applications (5)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US10/508,828 US20050151890A1 (en) | 2002-03-25 | 2003-03-24 | Optical film and process for producing the same |
EP03712844A EP1496376B1 (en) | 2002-03-25 | 2003-03-24 | Optical film and process for producing the same |
JP2003578978A JP4292993B2 (ja) | 2002-03-25 | 2003-03-24 | 光学用フィルムおよびその製造方法 |
AT03712844T ATE513236T1 (de) | 2002-03-25 | 2003-03-24 | Optischer film und prozess zu seiner herstellung |
US12/021,984 US7785503B2 (en) | 2002-03-25 | 2008-01-29 | Optical film and process for producing the same |
Applications Claiming Priority (2)
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JP2002083935 | 2002-03-25 | ||
JP2002-83935 | 2002-03-25 |
Related Child Applications (2)
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US10508828 A-371-Of-International | 2003-03-24 | ||
US12/021,984 Division US7785503B2 (en) | 2002-03-25 | 2008-01-29 | Optical film and process for producing the same |
Publications (1)
Publication Number | Publication Date |
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WO2003081299A1 true WO2003081299A1 (fr) | 2003-10-02 |
Family
ID=28449194
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2003/003506 WO2003081299A1 (fr) | 2002-03-25 | 2003-03-24 | Film optique et son procede de production |
Country Status (6)
Country | Link |
---|---|
US (2) | US20050151890A1 (ja) |
EP (1) | EP1496376B1 (ja) |
JP (1) | JP4292993B2 (ja) |
AT (1) | ATE513236T1 (ja) |
TW (1) | TW589466B (ja) |
WO (1) | WO2003081299A1 (ja) |
Cited By (7)
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JP2005156734A (ja) * | 2003-11-21 | 2005-06-16 | Fuji Photo Film Co Ltd | 偏光板、およびそれを用いた液晶表示装置 |
JP2006218611A (ja) * | 2005-02-14 | 2006-08-24 | Sumitomo Bakelite Co Ltd | 微細流路を有するプラスチック製品 |
JP2007083423A (ja) * | 2005-09-20 | 2007-04-05 | Konica Minolta Opto Inc | 光学フィルムの製造方法 |
EP1793975A1 (en) * | 2004-09-24 | 2007-06-13 | FUJIFILM Corporation | Cellulose acylate film, method of producing the same, stretched cellulose acylate film and method of producing the same |
WO2008044640A1 (fr) | 2006-10-11 | 2008-04-17 | Yasuhara Chemical Co., Ltd. | POLYMÈRE DE β-PINÈNE ET SON PROCÉDÉ DE PRODUCTION |
WO2014148476A1 (ja) * | 2013-03-22 | 2014-09-25 | コニカミノルタ株式会社 | 偏光板、偏光板の製造方法及び液晶表示装置 |
US10228782B2 (en) | 2013-03-04 | 2019-03-12 | Fujifilm Corporation | Transparent conductive film and touch panel |
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US7339635B2 (en) * | 2005-01-14 | 2008-03-04 | 3M Innovative Properties Company | Pre-stacked optical films with adhesive layer |
JP4367347B2 (ja) * | 2005-01-21 | 2009-11-18 | セイコーエプソン株式会社 | 膜形成方法及び電気光学装置の製造方法並びに電子機器 |
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KR101291901B1 (ko) * | 2009-08-05 | 2013-07-31 | 엘지디스플레이 주식회사 | 액정표시장치 |
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- 2003-03-24 WO PCT/JP2003/003506 patent/WO2003081299A1/ja active Application Filing
- 2003-03-24 JP JP2003578978A patent/JP4292993B2/ja not_active Expired - Lifetime
- 2003-03-24 TW TW092106489A patent/TW589466B/zh not_active IP Right Cessation
- 2003-03-24 EP EP03712844A patent/EP1496376B1/en not_active Expired - Lifetime
- 2003-03-24 AT AT03712844T patent/ATE513236T1/de not_active IP Right Cessation
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JP2005156734A (ja) * | 2003-11-21 | 2005-06-16 | Fuji Photo Film Co Ltd | 偏光板、およびそれを用いた液晶表示装置 |
EP1793975A1 (en) * | 2004-09-24 | 2007-06-13 | FUJIFILM Corporation | Cellulose acylate film, method of producing the same, stretched cellulose acylate film and method of producing the same |
EP1793975A4 (en) * | 2004-09-24 | 2013-01-23 | Fujifilm Corp | CELLULOSE ACYLATE FILM, PROCESS FOR PRODUCTION THEREOF, CELLULOSE FILM ACYLATE FILM AND PROCESS FOR PRODUCING THE SAME |
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US10228782B2 (en) | 2013-03-04 | 2019-03-12 | Fujifilm Corporation | Transparent conductive film and touch panel |
US10684710B2 (en) | 2013-03-04 | 2020-06-16 | Fujifilm Corporation | Transparent conductive film and touch panel |
WO2014148476A1 (ja) * | 2013-03-22 | 2014-09-25 | コニカミノルタ株式会社 | 偏光板、偏光板の製造方法及び液晶表示装置 |
Also Published As
Publication number | Publication date |
---|---|
JP4292993B2 (ja) | 2009-07-08 |
US20050151890A1 (en) | 2005-07-14 |
TW200400363A (en) | 2004-01-01 |
EP1496376A4 (en) | 2010-04-28 |
US7785503B2 (en) | 2010-08-31 |
US20080160223A1 (en) | 2008-07-03 |
ATE513236T1 (de) | 2011-07-15 |
EP1496376B1 (en) | 2011-06-15 |
TW589466B (en) | 2004-06-01 |
EP1496376A1 (en) | 2005-01-12 |
JPWO2003081299A1 (ja) | 2005-11-17 |
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