WO2009119408A1 - 光学フィルムおよびその製造方法および製造装置 - Google Patents
光学フィルムおよびその製造方法および製造装置 Download PDFInfo
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- WO2009119408A1 WO2009119408A1 PCT/JP2009/055288 JP2009055288W WO2009119408A1 WO 2009119408 A1 WO2009119408 A1 WO 2009119408A1 JP 2009055288 W JP2009055288 W JP 2009055288W WO 2009119408 A1 WO2009119408 A1 WO 2009119408A1
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- film
- optical film
- shielding plate
- rotating
- melt
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D11/00—Producing optical elements, e.g. lenses or prisms
- B29D11/0074—Production of other optical elements not provided for in B29D11/00009- B29D11/0073
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- 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
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- 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
- B29C48/30—Extrusion nozzles or dies
- B29C48/305—Extrusion nozzles or dies having a wide opening, e.g. for forming sheets
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- 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
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- 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
- B29C48/915—Cooling of flat articles, e.g. using specially adapted supporting means with means for improving the adhesion to the supporting means
- B29C48/9155—Pressure rollers
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- 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
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- 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
- B29C48/0022—Combinations of extrusion moulding with other shaping operations combined with cutting
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- 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
- B29C48/91—Heating, e.g. for cross linking
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- 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
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- 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
Definitions
- the present invention relates to an optical film, a manufacturing method thereof, and a manufacturing apparatus.
- Liquid crystal display devices are widely used as monitors because they save space and energy compared to conventional CRT display devices. Furthermore, it is also spreading for TV.
- various optical films such as a polarizing film and a retardation film are used.
- optical films are required to have uniform thickness and retardation without thickness unevenness and optical distortion.
- these required qualities are becoming stricter.
- Optical film production methods are roughly classified into a melt casting film forming method and a solution casting film forming method.
- the former is a method in which a polymer is heated and dissolved, cast on a support, cooled and solidified, and further stretched as necessary to form a film.
- the latter is a method in which a polymer is dissolved in a solvent, the solution is cast on a support, the solvent is evaporated, and further stretched as necessary to form a film.
- the molten polymer or polymer solution is cooled and solidified on the support. And after peeling from a support body, processes, such as drying and extending
- the solution casting film forming method has a problem that the environmental load is large because a large amount of solvent is used. On the other hand, since the melt casting film forming method does not use a solvent, an improvement in productivity can be expected.
- the melt casting film forming method is preferable from the viewpoint of environmental protection, but the film formed by melt casting has a drawback that the thickness unevenness and the optical distortion are larger than those of the solution casting film forming method. .
- thermoplastic resin is melted and extruded from a die into a sheet shape, and at least one roller is constituted by a metal roller.
- a method of manufacturing a thermoplastic resin film comprising a film forming step of forming a film by cooling and solidifying by sandwiching between a pair of rollers, wherein the sheet is in the vicinity of a nip sandwiched between the pair of rollers,
- a method for producing a thermoplastic resin film is disclosed, in which a suction chamber is provided in the vicinity of a roller surface of at least one of the pair of rollers, and entrained air generated as the roller rotates is sucked ( Patent Document 1).
- Patent Document 1 Even if the technique described in Patent Document 1 is used, it is not possible to obtain an optical film having optical characteristics sufficient to meet the severe demands of recent market quality. That is, since the collision of the entrained air with the melt cannot be completely prevented, the temperature drop of the melt is relatively large and non-uniform. Therefore, the thickness unevenness and optical distortion of the obtained optical film could not be sufficiently prevented.
- An object of the present invention is to provide an optical film in which thickness unevenness and optical distortion are sufficiently prevented, and a method and apparatus for producing the optical film by a melt casting film forming method.
- a method for producing an optical film by extruding a film-constituting material containing a molten thermoplastic resin from a lip portion of a casting die into a film shape, and cooling and solidifying the melt by sandwiching it with a pair of rotating rolls, Rotating the rotating roll by providing a shielding plate near the entrance of the nip of the pair of rotating rolls and in the vicinity of the surface of at least one rotating roll of the pair of rotating rolls, and heating the shielding plate
- a method for producing an optical film wherein entrained air generated along with the heating is heated.
- the size of the shielding plate is any one of the first to third items, characterized in that the length in the rotational direction of a rotary roll provided near the surface is 10 to 300 mm.
- An apparatus for producing an optical film by extruding a film-constituting material containing a molten thermoplastic resin into a film form from a lip portion of a casting die, and cooling and solidifying the melt by sandwiching it with a pair of rotating rolls,
- a heated shielding plate is provided in the vicinity of an inlet of a nip where the melt is sandwiched between the pair of rotating rolls and in the vicinity of the surface of at least one of the pair of rotating rolls.
- the shielding plate is provided at a predetermined position and the shielding plate is heated, entrained air colliding with the melt is effectively heated and reduced. Therefore, the temperature drop due to such entrained air of the melt extruded from the lip portion of the die is suppressed, and as a result, an optical film in which thickness unevenness and optical distortion are sufficiently prevented can be obtained.
- FIG. 1 It is a schematic block diagram which shows one Embodiment of the apparatus which enforces the manufacturing method of the optical film which concerns on this invention. It is a principal part enlarged view from the casting die in FIG. 1 to the rotation roll for cooling. It is a principal part enlarged view of the lip part vicinity in FIG. It is a disassembled perspective view which shows the outline of the block diagram of a liquid crystal display device.
- Extruder 2 Filter 3: Static mixer 4: Casting die 5: First rotating roll (first cooling roll) 6: Second rotating roll (touch roll) 7: 2nd cooling roll 8: 3rd cooling roll 9: 11: 13: 14: 15: Conveyance roll 10: Unstretched film 12: Stretching machine 16: Winding device 21a: 21b: Protective film 22a: 22b: Phase difference Film 23a: 23b: Film slow axis direction 24a: 24b: Polarizer transmission axis direction 25a: 25b: Polarizer 26a: 26b: Polarizing plate 27: Liquid crystal cell 29: Liquid crystal display device 41a: 41b: Lip part 42: Melt 45a: 45b: Shield plate 46a: 46b: Entrained air direction 47: Nip 70: Local exhaust device 71: Suction nozzle 72: Exhaust fan 73: Cooler 74: Filter 75: Differential pressure gauge 76: Piping 77: Heater
- the method and apparatus for producing an optical film according to the present invention is based on a so-called melt casting method, that is, a film constituent material containing a molten thermoplastic resin is extruded into a film form from a lip portion of a casting die, The melt is cooled and solidified by being sandwiched between a pair of rotating rolls to produce an optical film.
- FIG. 1 is a schematic configuration diagram showing an embodiment of an apparatus for carrying out the method for producing an optical film of the present invention.
- FIG. 2 is an enlarged view of a main part from the casting die to the cooling roll in FIG.
- FIG. 3 is an enlarged view of a main part in the vicinity of the lip part in FIG. 1 to 3, common reference numerals indicate similar members.
- melt extrusion process In this step, after film constituent materials including a thermoplastic resin are mixed and melted using the extruder 1, the melt 42 is removed from the casting die 4 via the filter 2 and the static mixer 3 as required. The film is extruded onto the first rotating roll 5. At that time, in the present invention, the melt-extruded film-like melt 42 is circumscribed to the first rotating roll 5 in a predetermined environment, and the second rotating roll 6 applies a predetermined surface to the first rotating roll 5 surface. Press with pressure.
- the first rotating roll 5 constitutes one of the pair of rotating rolls and is also called a first cooling roll or a cooling drum.
- the second rotating roll 6 constitutes the other of the pair of rotating rolls, and is also called a touch roll.
- the melt 42 is extruded from the lip portions 41a and 41b of the casting die 4 into a film shape
- the melt 42 is sandwiched between a pair of rotating rolls 5 and 6.
- the accompanying air 46a, 46b that collides with the melt 42 is heated by the shielding plates 45a, 45b.
- the shielding plates 45a and 45b reduce the amount of entrained air 46a and 46b generated.
- the accompanying air 46a, 46b is unavoidable as the rotating rolls 5, 6 rotate, but the amount of air that contributes to the generation of accompanying air is limited by the installation of the shielding plates 45a, 45b. The generation amount of accompanying air is reduced.
- the shielding plates 45a and 45b are heated to a predetermined temperature, the accompanying air 46a and 46b is heated when passing between the shielding plates 45a and 45b and the rotary rolls 5 and 6. Therefore, the temperature drop due to the entrained air collision of the melt is suppressed, and the melt has a relatively uniform temperature, particularly in the width direction. As a result, it is possible to obtain an optical film in which unevenness of thickness and optical distortion are sufficiently prevented as the whole film.
- the shielding plate means a plate that shields the air that flows when the accompanying air is generated.
- the shielding plates 45 a and 45 b are installed near the entrance of the nip 47 in the pair of rotating rolls 5 and 6 and in the vicinity of the surfaces of the rotating rolls 5 and 6. Specifically, the shielding plates 45 a and 45 b are installed between the rotary rolls 5 and 6 and the casting die 4 with a predetermined interval in the radial direction with respect to the rotary rolls 5 and 6. Although the shielding plate is installed in the vicinity of both surfaces of the rotary rolls 5 and 6 in FIG. 2, it may be installed in the vicinity of the surface of one rotary roll.
- the nip 47 is a portion where the melt 42 is sandwiched between the pair of rotating rolls.
- the shielding plates 45a and 45b will be described in detail, they may be selected and set independently.
- the shape of the shielding plates 45a and 45b is not particularly limited as long as entrained air can be heated and the generation amount thereof can be reduced, and may be, for example, a curved plate shape or a flat plate shape. From the viewpoint of more sufficiently preventing thickness unevenness and optical distortion, the shielding plate 45a (45b) preferably has a curved plate shape. As shown in FIG. 2, the shielding plate 45a (45b) has a circular arc shape that is concentric with the rotating roll 5 (6) provided in the vicinity of the surface, in a cross section perpendicular to the axial direction of the rotating roll 5 (6). It is particularly preferred to have
- the gaps (x 1 , x 2 ; see FIG. 3) between the shielding plate and the rotating roll provided with the shielding plate in the vicinity of the surface are not particularly limited, and may be, for example, 0.3 to 25 mm. From the viewpoint of more sufficiently preventing thickness unevenness and optical distortion, the gap is preferably maintained at 0.5 to 10 mm, particularly 0.5 to 3 mm.
- the dimension in particular of the shielding board 45a (45b) is not restrict
- the size of the shielding plate 45a (45b) is the length in the rotating direction of the rotating roll 5 (6) (y 1 (y 2 ); see FIG. 3).
- the thickness may be 3 to 400 mm, and from the viewpoint of more sufficiently preventing thickness unevenness and optical distortion, it is preferably 10 to 400 mm, particularly preferably 30 to 400 mm.
- the length in the front and back direction of the shielding plate 45a (45b) on the paper surface of FIG. 2 is longer than the entire length of the lip portions 41a and 41b.
- the shielding plate 45a (45b) has a distance (z 1 (z 2 )) from the film-like melt 42 extruded from the lip portions 41a and 41b from the viewpoint of further sufficiently preventing thickness unevenness and optical distortion; see FIG. ) Is preferably 1-100 mm, particularly 10-30 mm.
- the heating temperature of the shielding plate 45a (45b) is not particularly limited as long as the temperature drop of the melt 42 due to entrained air is suppressed, and may normally be 50 to 300 ° C. From the viewpoint of more sufficiently preventing thickness unevenness and optical distortion, 80 to 260 ° C. is preferable.
- the heating means (not shown) for the shielding plate 45a (45b) is not particularly limited, and may be heated by, for example, a cartridge heater.
- the material of the shielding plate 45a (45b) is not particularly limited as long as it has heat resistance that does not deform even when heated, and examples thereof include metals such as stainless steel, aluminum, copper, and carbon steel, and ceramics.
- Preferred materials for the first rotating roll 5 and the second rotating roll 6 include carbon steel, stainless steel, resin, and the like.
- the surface accuracy is preferably increased, and the surface roughness is set to 0.3 S or less, more preferably 0.01 S or less.
- the second rotating roll 6 is preferably pressed against the first rotating roll 5 by pressing means.
- the linear pressure with which the second rotating roll 6 presses the film at this time can be adjusted by a pneumatic piston or the like, and is preferably 0.1 to 100 kgf / cm, more preferably 1 to 50 kgf / cm.
- the surface temperatures of the first rotating roll 5 and the second rotating roll 6 are not particularly limited.
- the first rotating roll 5 is 80 to 150 ° C., particularly 100 to 130 ° C.
- the second rotating roll 6 is 80 to 150 ° C.
- the temperature is preferably set to 100 to 130 ° C.
- the first rotating roll 5 or the second rotating roll 6 can have a narrow roll diameter or a flexible roll surface in order to improve the uniformity of adhesion with the film.
- a suction nozzle 71 is provided over the entire length of the lip portion on both sides or one side of the lip portions 41a and 41b, and a gas containing a sublimation substance generated from the melt 42 is contained. It is preferable to suck. This can prevent the sublimate from adhering to the film.
- the suction nozzle 71 is provided between the shielding plates 45 a and 45 b and the casting die 4 and forms part of the local exhaust device 70.
- the local exhaust device 70 has a suction nozzle 71 disposed in the vicinity of the lip portions 41 a and 41 b at the tip of the casting die 4, and a gas containing sublimate generated from the vicinity of the lip portions 41 a and 41 b.
- the pipe (gas pipe) 76 is designed so that the sublimation gas does not directly touch the die lip. By independently heating the pipe, it is possible to prevent the deposition of the sublimate derived from the raw material cellulose in the pipe.
- the sublimate is satisfactorily removed over a long period of time by adding a process of cooling the heated gas with the cooler 73. be able to. As a result, a film having no foreign matter failure can be produced over a long period of time.
- the area of the suction nozzle mouth smaller than the cross-sectional area of the pipe, it is possible to further suppress the accumulation of sublimates in the pipe.
- the cooling method used as the cooler 73 can be any method that can cool the gas in the pipe 76.
- a method of introducing outside air around the pipe 76, a method using a Peltier element, a method using a refrigeration circuit, a method using cooling water, or the like can be used.
- the cooling temperature by the cooler 73 is preferably 10 ° C. to 50 ° C.
- adhesion of sublimate to the filter 74 tends to occur.
- the temperature is lower than 10 ° C., moisture in the exhaust gas adheres to the cooler, and it becomes difficult to remove sublimates.
- the suction port of the suction nozzle 71 is preferably installed within 100 mm from the tips of the lip portions 41a and 41b. If it exceeds 100 mm, the generated gas cannot be sufficiently sucked.
- the wind speed at the tip of the suction nozzle 71 where the suction port is located is preferably 0.1 to 1 m / min.
- the wind speed is preferably uniform in the width direction (also referred to as TD direction) of the film, and the deviation of the wind speed in the width direction is preferably within ⁇ 30%. More preferably, it is within 10%. It is important that the slit gap at the nozzle tip is uniform in the width direction.
- the suction nozzle is set so that the wind speed is uniform in the width direction.
- the suction nozzle 71 in FIGS. 2 and 3 may have a continuous slit shape in the width direction or in the width direction. It may be divided into two. By dividing, it becomes easy to incorporate and maintain the device.
- the wind speed is not limited to this as long as it
- the width deviation of the slit gap ⁇ is preferably within 10%, more preferably within 5%. Further, it is important that there is no fluctuation in wind speed, and fluctuation in wind speed when measured at the same location is preferably within ⁇ 30%, more preferably within 10%.
- a heater 77 indicated by the hatched portion in FIG. It is preferable.
- the heater temperature is preferably 80 ° C. or higher and 250 ° C. or lower, and more preferably 110 ° C. or higher and 200 ° C. or lower.
- a rubber heater, a cartridge heater, an aluminum cast heater, or the like can be preferably used, but is not limited thereto.
- a rubber heater is particularly preferred.
- the material constituting the optical film of the present invention contains at least a thermoplastic resin, and may contain a stabilizer, a plasticizer, an ultraviolet absorber, a matting agent as a slipping agent, and a retardation control agent as necessary. These materials are appropriately selected depending on the required characteristics of the target optical film.
- thermoplastic resin a resin conventionally used in the field of optical films can be used.
- a cellulose resin is preferably used.
- the cellulose resin has a cellulose ester structure and is preferably a single or mixed acid ester of cellulose having at least one group selected from a fatty acid acyl group and a substituted or unsubstituted aromatic acyl group. is there.
- cellulose resin examples include cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, cellulose acetate butyrate, cellulose acetate phthalate, and cellulose phthalate.
- particularly preferable cellulose resins include cellulose acetate, cellulose propionate, cellulose butyrate, cellulose acetate propionate, and cellulose acetate butyrate.
- a cellulose resin may be used individually by 1 type, or may be used in combination of 2 or more type.
- Cellulose acetate propionate and cellulose acetate butyrate which are mixed fatty acid esters, have an acyl group having 2 to 4 carbon atoms as a substituent, the substitution degree of acetyl group is X, and the substitution degree of propionyl group or butyryl group When Y represents Y, those satisfying the following formulas (I) and (II) are preferable.
- the degree of substitution is defined as a numerical value indicating the number of hydroxyl groups substituted by an acyl group in glucose units.
- Formula (II) 0 ⁇ X ⁇ 2.5 In particular, cellulose acetate propionate is preferably used. Among them, 1.9 ⁇ X ⁇ 2.5 and 0.1 ⁇ Y ⁇ 0.9 are preferable.
- the portion not substituted with the acyl group usually exists as a hydroxyl group.
- Cellulose resin can be synthesized by a known method.
- the raw material cellulose of the cellulose resin used in the present invention may be wood pulp or cotton linter, and the wood pulp may be softwood or hardwood, but softwood is more preferable.
- a cotton linter is preferably used from the viewpoint of peelability during film formation.
- Cellulose resins made from these can be used in appropriate mixture or independently.
- the molecular weight of the cellulose resin is not particularly limited.
- the number average molecular weight is preferably 60,000 to 200,000, particularly preferably 70,000 to 120,000.
- the melt of the film constituent material can be filtered with the filter 2.
- the material of the filter conventionally known materials such as glass fibers, cellulose fibers, filter paper, and fluororesins such as tetrafluoroethylene resin are preferably used, and ceramics, metals and the like are particularly preferably used.
- the absolute filtration accuracy is 50 ⁇ m or less, preferably 30 ⁇ m or less, more preferably 10 ⁇ m or less, and still more preferably 5 ⁇ m or less. These can be used in combination as appropriate.
- the filter can be either a surface type or a depth type, but the depth type is preferable because it is relatively less clogged.
- Additives such as stabilizers, plasticizers, ultraviolet absorbers, matting agents, retardation control agents, etc., which may be contained in the film constituent materials, are those conventionally used as additives in the field of optical films. It can be used.
- Stabilizers suppress the generation of volatile components and deterioration of strength due to alteration and decomposition of film constituent materials.
- stabilizers include hindered phenol antioxidants, acid scavengers, hindered amine light stabilizers, peroxide decomposers, radical scavengers, metal deactivators, amines, and the like.
- hindered phenol antioxidant for example, those described in US Pat. No. 4,839,405, columns 12 to 14 can be used. Specific examples include 2,6-dialkylphenol derivative compounds.
- Hindered phenol antioxidants are available, for example, from Ciba Specialty Chemicals under the trade names “Irganox 1076” and “Irganox 1010”.
- Examples of the acid scavenger include epoxy compounds described in US Pat. No. 4,137,201.
- hindered amine light stabilizers include those described in columns 5 to 11 of US Pat. No. 4,619,956 and columns 3 to 5 of US Pat. No. 4,839,405. Can be used. Specific examples include 2,2,6,6-tetraalkylpiperidine compounds, acid addition salts thereof, or complexes of these with metal compounds.
- the addition amount of the stabilizer is preferably 0.001% by weight or more and 5% by weight or less, more preferably 0.005% by weight or more and 3% by weight or less, and further preferably 0.01% by weight with respect to the thermoplastic resin.
- the content is 0.8% by weight or less.
- Two or more kinds of stabilizers may be used as a mixture, and in that case, the total amount thereof may be within the above range.
- the plasticizer is preferably used in terms of film modification such as improvement of mechanical properties, imparting flexibility, imparting water absorption resistance, and reducing moisture permeability. Further, by adding a plasticizer, the melting temperature of the film constituent material can be lowered, or the melt viscosity of the film constituent material containing the plasticizer can be lowered at the same heating temperature as compared with the thermoplastic resin alone. it can.
- plasticizer for example, phosphate ester derivatives and carboxylic acid ester derivatives are preferably used.
- Examples of phosphoric acid ester derivatives include triphenyl phosphate, tricresyl phosphate, phenyl diphenyl phosphate, and the like.
- carboxylic acid ester derivatives include phthalic acid esters and citric acid esters.
- examples of the phthalic acid ester derivative include dimethyl phthalate, diethyl phthalate, dicyclohexyl phthalate, dioctyl phthalate, and diethyl hexyl phthalate.
- Citric acid esters include acetyl triethyl citrate and acetyl tributyl citrate.
- Alkylphthalylalkyl glycolates are also preferably used for this purpose.
- the alkyl in the alkylphthalylalkyl glycolate is an alkyl group having 1 to 8 carbon atoms.
- 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, methyl phthalyl ethyl glycolate, Ethyl phthalyl methyl glycolate, ethyl phthalyl propyl glycolate, propyl phthalyl ethyl glycolate, methyl phthalyl propyl glycolate, methyl phthalyl butyl glycolate, ethyl phthalyl butyl glycolate, butyl phthalyl methyl glycolate, butyl Phthalyl ethyl glycolate, propyl phthalyl butyl glycolate, butyl phthalyl propyl glycolate, methyl phthalyl octyl glycolate, e
- the addition amount of the plasticizer is preferably 0.5% by weight to less than 20% by weight, more preferably 1% by weight to less than 11% by weight with respect to the thermoplastic resin. Two or more kinds of plasticizers may be used in combination, and in that case, the total amount thereof may be within the above range.
- the ultraviolet absorber is excellent in the ability to absorb ultraviolet rays having a wavelength of 370 nm or less from the viewpoint of preventing deterioration of the polarizer and the display device with respect to ultraviolet rays, and has little absorption of visible light having a wavelength of 400 nm or more from the viewpoint of liquid crystal display properties. Those are preferred.
- Examples of ultraviolet absorbers include oxybenzophenone compounds, benzotriazole compounds, salicylic acid ester compounds, benzophenone compounds, cyanoacrylate compounds, nickel complex compounds, and the like. Less benzotriazole compounds are preferred. Further, ultraviolet absorbers described in JP-A-10-182621 and JP-A-8-337574, and polymer ultraviolet absorbers described in JP-A-6-148430 may be used.
- UV absorbers are commercially available, for example, as TINUVIN 109, TINUVIN 171 and TINUVIN 326 (all manufactured by Ciba Specialty Chemicals).
- the addition amount of the ultraviolet absorber is 0.1 to 20% by weight, preferably 0.5 to 10% by weight, more preferably 1 to 5% by weight with respect to the thermoplastic resin. Two or more kinds of ultraviolet absorbers may be used in combination, and in that case, the total amount thereof may be within the above range.
- the matting agent improves the slipperiness, transportability, winding property and strength of the film.
- the matting agent is preferably as fine as possible.
- the fine particles include silicon dioxide, titanium dioxide, aluminum oxide, zirconium oxide, calcium carbonate, kaolin, talc, calcined calcium silicate, hydrated calcium silicate, aluminum silicate, Examples thereof include inorganic fine particles such as magnesium silicate and calcium phosphate, and crosslinked polymer fine particles.
- silicon dioxide is preferable because it can reduce the haze of the film.
- fine particles such as silicon dioxide are surface-treated with an organic material, but such a material is preferable because it can reduce the haze of the film.
- Preferred organic materials for the surface treatment include halosilanes, alkoxysilanes, silazanes, siloxanes, and the like.
- the average particle size of the secondary particles of the fine particles is in the range of 0.005 to 1.0 ⁇ m.
- the average particle size of the secondary particles of the fine particles is preferably 5 to 50 nm, more preferably 7 to 14 nm. These fine particles are preferably used for generating irregularities of 0.01 to 1.0 ⁇ m on the film surface.
- the content of the fine particles is preferably 0.005 to 0.3% by weight with respect to the thermoplastic resin.
- Examples of the fine particles of silicon dioxide include Aerosil 200, 200V, 300, R972, R972V, R974, R202, R812, OX50, TT600 manufactured by Nippon Aerosil Co., Ltd., preferably Aerosil 200V, R972, R972V, R974, R202, and R812. Two or more kinds of these fine particles may be used in combination.
- the matting agent is preferably added before the film constituent material is melted or is previously contained in the film constituent material.
- the solvent is volatilized or the matting agent is preliminarily formed into a film by a precipitation method. Included in the material.
- the matting agent can be uniformly dispersed in the thermoplastic resin.
- the retardation control agent is preferably used as an optical film, for example, when a retardation film is produced.
- an aromatic compound having two or more aromatic rings as described in European Patent No. 911,656A2 can be used. Two or more aromatic compounds may be used in combination.
- the aromatic ring of the aromatic compound includes an aromatic heterocyclic ring in addition to the aromatic hydrocarbon ring. Particularly preferred is an aromatic heterocycle, and the aromatic heterocycle is generally an unsaturated heterocycle. Of these, a 1,3,5-triazine ring is particularly preferred.
- the total amount of additives including them is 1% by weight to 30% by weight with respect to the thermoplastic resin, preferably 5 to 20% by weight.
- polymer materials other than cellulose resin and oligomers may be appropriately selected and mixed.
- a polymer material or oligomer preferably has excellent compatibility with the cellulose resin, and the transmittance is 80% or more, preferably 90% or more, more preferably over the entire visible region (400 nm to 800 nm) when formed into a film. Is 92% or more.
- the purpose of mixing at least one of polymer materials and oligomers other than the cellulose resin includes meanings for viscosity control at the time of heating and melting and for improving film physical properties after film processing.
- thermoplastic resin it is preferable to mix the thermoplastic resin and other additives such as a stabilizer added as necessary before melting.
- Mixing may be performed by a mixer or the like, or may be mixed in the cellulose resin preparation process as described above.
- a general mixer such as a V-type mixer, a conical screw type mixer, a horizontal cylindrical type mixer, or the like can be used.
- the mixture may be directly melted using the extruder 1 to form a film, but once the film constituent materials are pelletized, the pellets are melted by the extruder 1 Then, the film may be formed.
- the film constituent material includes a plurality of materials having different melting points
- a so-called braided semi-melt is once produced at a temperature at which only the material having a low melting point is melted, and the semi-melt is supplied to the extruder 1. It is also possible to form a film by introducing it.
- the film component contains a material that is easily pyrolyzed, in order to reduce the number of times of melting, a method of directly forming a film without producing pellets, or after making a paste-like semi-molten material as described above A method of forming a film is preferred.
- Melt extrusion can be performed under the same conditions as those used for other thermoplastic resins such as polyester.
- the material is preferably dried beforehand. It is desirable to dry the moisture to 1000 ppm or less, preferably 200 ppm or less, using a vacuum or reduced pressure dryer or a dehumidifying hot air dryer.
- a thermoplastic resin dried under hot air, vacuum or reduced pressure is melted using an extruder 1 at an extrusion temperature of about 200 to 300 ° C., and filtered through a leaf disk type filter 2 to remove foreign matters.
- additives such as plasticizer are not mixed in advance, they may be kneaded in the middle of the extruder. In order to add uniformly, it is preferable to use a mixing apparatus such as a static mixer 3.
- the extruder 1 what is generally available as a plastic extruder is used, and various extruders available on the market can be used. However, a melt-kneading extruder is preferable, and a single-screw extruder or a twin-screw extruder is also used. An extruder may be used. When forming a film directly without producing pellets from film constituent materials, it is preferable to use a twin-screw extruder because an appropriate degree of kneading is required. However, even with a single-screw extruder, the screw shape is a Maddock type.
- a kneading type screw such as a unimelt type or a dull mage
- moderate kneading can be obtained, so that it can be used.
- a pellet or braided semi-melt is once used as a film constituent material, it can be used in either a single screw extruder or a twin screw extruder. In the extruder, it is preferable to lower the oxygen concentration by replacing with an inert gas such as nitrogen gas or by reducing the pressure.
- the preferable conditions for the melting temperature of the film constituent material in the extruder 1 vary depending on the viscosity and discharge amount of the film constituent material, the thickness of the sheet to be manufactured, etc., in general, the glass transition temperature (Tg) of the film Tg or more and Tg + 100 ° C. or less, preferably Tg + 10 ° C. or more and Tg + 90 ° C. or less.
- the melt viscosity at the time of extrusion is 10 to 100,000 poise, preferably 100 to 10,000 poise.
- the residence time of the film constituent material in the extruder 1 is preferably shorter, and is within 5 minutes, preferably within 3 minutes, more preferably within 2 minutes. Although the residence time depends on the type of the extruder 1 and the extrusion conditions, it can be shortened by adjusting the material supply amount, L / D, screw rotation speed, screw groove depth, etc. It is.
- the shape of the screw and the number of revolutions of the extruder 1 are appropriately selected depending on the viscosity and the discharge amount of the film constituent material.
- the shear rate in the extruder 1 is 1 / second to 10,000 / second, preferably 5 / second to 1000 / second, more preferably 10 / second to 100 / second.
- the film constituting material extruded from the extruder 1 is sent to the casting die 4 and extruded from the casting die 4 into a film shape.
- the casting die 4 to which the melt discharged from the extruder 1 is supplied is not particularly limited as long as it is used for producing a sheet or a film.
- the material of the casting die 4 is sprayed or plated with hard chromium, chromium carbide, chromium nitride, titanium carbide, titanium carbonitride, titanium nitride, super steel, ceramic (tungsten carbide, aluminum oxide, chromium oxide), etc.
- Processing includes buffing, lapping using a # 1000 or higher whetstone, flat cutting using a # 1000 or higher diamond whetstone (the cutting direction is perpendicular to the resin flow direction), electrolytic polishing, and electrolytic composite polishing. And so on.
- a preferable material of the lip portion of the casting die 4 is the same as that of the casting die 4.
- the film-like melt pressed by the pair of rotary rolls 5 and 6 is further cooled and solidified while being sequentially circumscribed and conveyed to the second cooling roll 7 and the third cooling roll 8, and the unstretched film 10 is formed. can get.
- the unstretched film 10 peeled off from the third cooling roll 8 by the peeling roll 9 is guided to a stretching machine 12 through a dancer roll (film tension adjusting roll) 11, where the film 10 is stretched and then wound. Winding is performed by the take-up device 16.
- the molecules in the film are oriented by stretching.
- the film is usually stretched in the width direction. Not only the width direction but also the conveyance direction (also referred to as the longitudinal direction or MD direction) can be stretched.
- a known tenter or the like can be preferably used as a method of stretching the film in the width direction.
- the slow axis of the optical film obtained in the present invention is in the width direction.
- the stretching in the transport direction is preferably performed in a single or multi-stage longitudinal direction via one or a plurality of roll groups and / or a heating device such as an infrared heater.
- stretching can be performed sequentially or simultaneously, for example with respect to the conveyance direction and the width direction of a film.
- Tg glass transition temperature of the film of the present invention
- a film stretched in the transport direction within a temperature range of (Tg-30) ° C. or more and (Tg + 100) ° C. is (Tg ⁇ 20) ° C. or more and (Tg + 20) ° C. It is preferable to stretch in the width direction within the following temperature range and then heat-set.
- the final draw ratio in the biaxial direction is preferably in the range of 1.0 to 2.0 times in the transport direction and 1.01 to 2.5 times in the width direction. It is more preferable to obtain a retardation value required to be performed in a range of 01 to 1.5 times and 1.05 to 2.0 times in the width direction.
- a known heat setting treatment, cooling treatment and relaxation treatment may be performed, and may be appropriately adjusted so as to have the characteristics required for the target optical film.
- the film After stretching, after slitting the edge of the film to a product width by the slitter 13, the film is subjected to knurling (embossing) on both ends of the film by a knurling device comprising an embossing ring 14 and a back roll 15.
- a knurling device comprising an embossing ring 14 and a back roll 15.
- the knurling method can process a metal ring having an uneven pattern on its side surface by heating or pressing.
- the grip part of the clip of the both ends of a film is deform
- Optical film In the optical film obtained in the present invention, thickness unevenness and optical distortion are sufficiently prevented.
- the film thickness variation in the width direction is within ⁇ 1.5%, further within ⁇ 1% with respect to the average film thickness.
- the film thickness variation is measured by measuring 30 points in the width direction with a film thickness meter, and is expressed as a ratio of the maximum variation width to the average film thickness.
- the “average film thickness” means the average value of the thickness of the entire film width excluding both ends (mimi) due to neck-in.
- the retardation fluctuation of the optical film obtained after the stretching step is 10% or less, and further 5% or less.
- Retardation variation is expressed by a variation coefficient (CV) of retardation distribution obtained by measuring retardation at 1 cm intervals in the width direction of the obtained film.
- CV variation coefficient
- in-plane retardation and thickness direction retardation are each determined by the standard deviation by the (n-1) method, and the coefficient of variation (CV) shown below is determined as an index. .
- n can be calculated by setting 130 to 140.
- the thickness of the optical film obtained in the present invention may be appropriately selected according to the application.
- the thickness is preferably 10 to 500 ⁇ m.
- the lower limit is 20 ⁇ m or more, preferably 35 ⁇ m or more.
- the upper limit is 150 ⁇ m or less, preferably 120 ⁇ m or less. A particularly preferred range is 25 to 90 ⁇ m.
- the Tg of the optical film is not particularly limited, but when the optical film is used as a retardation film or a polarizing plate protective film, Tg is 120 ° C. from the viewpoint of preventing changes in the molecular orientation state in the usage environment. As mentioned above, Preferably it is set as 135 degreeC or more. From the viewpoint of reducing energy consumption during film production and preventing coloration, Tg is preferably 250 ° C. or lower.
- the Tg of the film can be controlled by changing the material type constituting the film and the ratio of the constituting material.
- the optical film according to the present invention is useful as a functional film used in various displays such as a liquid crystal display, a plasma display, and an organic EL display, particularly a liquid crystal display.
- a polarizing plate protective film, a retardation film, and an antireflection film are used. It is particularly suitable as a film, a brightness enhancement film, an optical compensation film for expanding the viewing angle, and the like.
- a liquid crystal display element having a configuration as shown in FIG. 4 can be manufactured.
- 21a and 21b are protective films
- 22a and 22b are retardation films
- 25a and 25b are polarizers
- 23a and 23b are slow axis directions of the film
- 24a and 24b are transmission axis directions of the polarizer
- 27 is A liquid crystal cell 29 is a liquid crystal display device.
- Reference numerals 26a and 26b denote polarizing plates, which include a protective film, a retardation film, and a polarizer.
- the optical film of the present invention may be used as the protective films 21a and 21b, or may be used as the retardation films 22a and 22b.
- Example 1 100 parts by mass of cellulose acetate propionate (acetyl group substitution degree 1.95, propionyl group substitution degree 0.7, number average molecular weight 75000, dried at 130 ° C.
- the shielding plates 45a and 45b shown in FIGS. 2 and 3 were heated and used.
- a device 70 shown in FIG. 2 was used as the local exhaust device.
- ⁇ 5mm
- the first cooling roll and the second cooling roll were made of stainless steel having a diameter of 40 cm, and the surface was hard chrome plated.
- temperature adjusting oil cooling fluid was circulated inside to control the roll surface temperature.
- the elastic touch roll had a diameter of 30 cm, the inner cylinder and the outer cylinder were made of stainless steel, and the outer cylinder surface was hard chrome plated.
- the wall thickness of the outer cylinder was 2 mm, and oil for cooling (cooling fluid) was circulated in the space between the inner cylinder and the outer cylinder to control the surface temperature of the elastic touch roll.
- the obtained pellets (water content 50 ppm) were melted in a single screw extruder and subjected to pressure filtration using a leaf disk type metal filter.
- a cast film having a draw ratio of 10 and a film thickness of 100 ⁇ m was obtained from a casting die in a film shape on a first cooling roll having a surface temperature of 100 ° C. at a melting temperature of 250 ° C.
- a casting die having a lip clearance of 1.0 mm and an average surface roughness Ra of 0.01 ⁇ m was used.
- silica fine particles as a slip agent were added from the hopper opening in the middle of the extruder so as to be 0.1 part by mass.
- the elastic touch roll having a 2 mm thick metal surface was pressed at a linear pressure of 10 kgf / cm on the first cooling roll.
- the film temperature on the touch roll side during pressing was 180 ° C. ⁇ 1 ° C.
- the film temperature on the touch roll side at the time of pressing here refers to the temperature of the film at the position where the touch roll on the first rotating roll (cooling roll) is in contact with the touch roll by using a non-contact thermometer.
- the glass transition temperature Tg of this film was 136 ° C.
- Tg measured the glass transition temperature of the film extruded from the die by DSC method (in nitrogen, temperature rising temperature 10 ° C./min) using “DSC6200” manufactured by Seiko Co., Ltd.
- the surface temperature of the elastic touch roll was 100 ° C.
- the surface temperature of the second cooling roll was 30 ° C.
- the surface temperature of each roll of the elastic touch roll, the first cooling roll, and the second cooling roll is determined by measuring the temperature of the roll surface at a position 90 ° before the rotation direction from the position where the film first contacts the roll. The average value obtained by measuring 10 points in the width direction using was used as the surface temperature of each roll.
- the film forming speed was 20 m / min.
- the obtained film is introduced into a tenter having a preheating zone, a stretching zone, a holding zone, and a cooling zone (there is also a neutral zone for ensuring thermal insulation between the zones), and 160 ° C. in the width direction.
- the film is stretched 1.3 times, cooled to 70 ° C while relaxing 2% in the width direction, then released from the clip, the clip gripping part is trimmed, and a knurling process with a width of 10 mm and a height of 5 ⁇ m is applied to both ends of the film.
- a film F-1 having a thickness of 80 ⁇ m slit into a width of 1430 mm was obtained.
- the preheating temperature and the holding temperature were adjusted to prevent the bowing phenomenon due to stretching.
- the value of the differential pressure gauge for measuring the pressure difference before and after the filter of the local exhaust device at the start of film formation was 120 Pa.
- the wind speed at the tip of the suction nozzle was measured and found to be 0.4 m / s.
- the differential pressure after use for 10 days was 133 Pa.
- Example 2 A film was produced in the same manner as in Example 1 except that the conditions of the shielding plates 45a and 45b were changed as shown in Table 1.
- Comparative Example 1 A film was produced in the same manner as in Example 1 except that the shielding plates 45a and 45b were not heated.
- Comparative Example 2 A film was produced in the same manner as in Example 1 except that the shielding plates 45a and 45b were not provided.
- Evaluation by crossed Nicols Two polarizing plates were placed in an orthogonal state, a film was placed between them, and unevenness was visually observed.
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Abstract
Description
前記一対の回転ロールにおけるニップの入口近傍であって、前記一対の回転ロールのうち少なくとも一方の回転ロールの表面近傍に、遮蔽板を設け、かつ該遮蔽板を加熱して、前記回転ロールの回転に伴って発生する同伴エアを加熱することを特徴とする光学フィルムの製造方法。
前記溶融物が前記一対の回転ロールに挟み込まれるニップの入口近傍であって、前記一対の回転ロールのうち少なくとも一方の回転ロールの表面近傍に、加熱される遮蔽板を備えたことを特徴とする光学フィルムの製造装置。
2:フィルター
3:スタチックミキサー
4:流延ダイ
5:第1回転ロール(第1冷却ロール)
6:第2回転ロール(タッチロール)
7:第2冷却ロール
8:第3冷却ロール
9:11:13:14:15:搬送ロール
10:未延伸フィルム
12:延伸機
16:巻取り装置
21a:21b:保護フィルム
22a:22b:位相差フィルム
23a:23b:フィルムの遅相軸方向
24a:24b:偏光子の透過軸方向
25a:25b:偏光子
26a:26b:偏光板
27:液晶セル
29:液晶表示装置
41a:41b:リップ部
42:溶融物
45a:45b:遮蔽板
46a:46b:同伴エアの方向
47:ニップ
70:局所排気装置
71:吸引ノズル
72:排気ファン
73:冷却器
74:フィルタ
75:差圧計
76:配管
77:ヒーター
本発明に係る光学フィルムの製造方法および製造装置は、いわゆる溶融流延法に基づくものであり、すなわち、溶融した熱可塑性樹脂を含むフィルム構成材料を流延ダイのリップ部よりフィルム状に押出し、当該溶融物を一対の回転ロールで挟むことにより冷却固化させて光学フィルムを製造する。
(溶融押出工程)
本工程では、熱可塑性樹脂を含むフィルム構成材料を混合し、押出し機1を用いて、溶融した後、所望によりフィルタ2およびスタチックミキサー3を経由させて、流延ダイ4から溶融物42をフィルム状に、第1回転ロール5上に押し出す。その際、本発明においては、溶融押出されたフィルム状溶融物42を、所定の環境下で、第1回転ロール5に外接させるとともに、第2回転ロール6により第1回転ロール5表面に所定の圧力で押圧する。第1回転ロール5は、前記一対の回転ロールの一方を構成するものであり、第1冷却ロールまたは冷却ドラムとも呼ばれるものである。第2回転ロール6は、前記一対の回転ロールの他方を構成するものであり、タッチロールとも呼ばれるものである。
式(II) 0≦X≦2.5
特にセルロースアセテートプロピオネートが好ましく用いられ、中でも1.9≦X≦2.5であり、0.1≦Y≦0.9であることが好ましい。上記アシル基で置換されていない部分は通常水酸基として存在している。
(延伸・巻き取り工程)
本工程では、第3冷却ロール8から剥離ロール9によって剥離された未延伸のフィルム10を、ダンサーロール(フィルム張力調整ロール)11を経て延伸機12に導き、そこでフィルム10を延伸した後、巻取り装置16により巻き取る。延伸により、フィルム中の分子が配向される。
[光学フィルム]
本発明で得られる光学フィルムは厚みムラや光学歪みが十分に防止されている。
本発明で得られる光学フィルムの厚さは、用途に応じて適宜選択されてよい。例えば、本発明の光学フィルムを位相差フィルムや偏光板保護フィルムとして使用する場合、厚さは、10~500μmが好ましい。特に、下限は20μm以上、好ましくは35μm以上である。上限は150μm以下、好ましくは120μm以下である。特に好ましい範囲は25~90μmである。
(実施例1)
(ペレットの作成)
セルロースアセテートプロピオネート 100質量部
(アセチル基の置換度1.95、プロピオニル基の置換度0.7、数平均分子量75000、温度130℃で5時間乾燥、ガラス転移温点Tg=174℃)
トリメチロールプロパントリス(3,4,5-トリメトキシベンゾエート)
10質量部
IRGANOX-1010(チバ・スペシャルティ・ケミカルズ社製) 1質量部
SumilizerGP(住友化学社製) 1質量部
上記材料に、マット剤としてシリカ粒子(アエロジルR972V(日本アエロジル社製))0.05質量部、紫外線吸収剤として、TINUVIN360(チバ・スペシャルティ・ケミカルズ社製)0.5質量部を加え、窒素ガスを封入したV型混合機で30分混合した後、ストランドダイを取り付けた2軸押し出し機(PCM30(株)池貝社製)を用いて240℃で溶融させ、長さ4mm、直径3mmの円筒形のペレットを作製した。この時のせん断速度は、25(/s)に設定した。
(フィルムの製造)
フィルムを図1~図3に示す製造装置で製造した。
遮蔽板45b;ロール6と同心円の円弧形状ステンレス製、厚み10mm、x2=0.3mm、y2=70mm、z2=10mm、加熱温度=120℃
局所排気装置として、図2に示す装置70を用いた。α=5mm
第1冷却ロール及び第2冷却ロールは直径40cmのステンレス製とし、表面にハードクロムメッキを施した。又、内部には温度調整用のオイル(冷却用流体)を循環させて、ロール表面温度を制御した。弾性タッチロールは、直径30cmとし、内筒と外筒はステンレス製とし、外筒の表面にはハードクロムメッキを施した。外筒の肉厚は2mmとし、内筒と外筒との間の空間に温度調整用のオイル(冷却用流体)を循環させて弾性タッチロールの表面温度を制御した。
(実施例2~15)
遮蔽板45a、45bの条件を表1に示すように変更したこと以外、実施例1と同様の方法により、フィルムを製造した。
(比較例1)
遮蔽板45a、45bを加熱しなかったこと以外、実施例1と同様の方法により、フィルムを製造した。
(比較例2)
遮蔽板45a、45bを設けなかったこと以外、実施例1と同様の方法により、フィルムを製造した。
(評価)
クロスニコルによる評価:2枚の偏光板を直交状態にし、その間にフィルムを設置して目視によりムラを観察した。
△;わずかにムラが見えるが実用上問題なし;
×;ムラが明確に見え、実用上問題。
Claims (9)
- 溶融した熱可塑性樹脂を含むフィルム構成材料を流延ダイのリップ部よりフィルム状に押出し、該溶融物を一対の回転ロールで挟むことにより冷却固化させて光学フィルムを製造する方法であって、
前記一対の回転ロールにおけるニップの入口近傍であって、前記一対の回転ロールのうち少なくとも一方の回転ロールの表面近傍に、遮蔽板を設け、かつ該遮蔽板を加熱して、前記回転ロールの回転に伴って発生する同伴エアを加熱することを特徴とする光学フィルムの製造方法。 - 前記遮蔽板が、回転ロール軸方向に対する垂直断面において、該遮蔽板が表面近傍に設けられた回転ロールと同心円の円弧形状を有することを特徴とする請求の範囲第1項に記載の光学フィルムの製造方法。
- 前記遮蔽板と該遮蔽板が表面近傍に設けられた回転ロールとの間隙を0.5~10mmに保つことを特徴とする請求の範囲第1項または第2項に記載の光学フィルムの製造方法。
- 前記遮蔽板の寸法が、該遮蔽板が表面近傍に設けられた回転ロールの回転方向の長さで10~300mmであることを特徴とする請求の範囲第1項から第3項のいずれか1項に記載の光学フィルムの製造方法。
- 前記遮蔽板が80~260℃に加熱されることを特徴とする請求の範囲第1項から第4項のいずれか1項に記載の光学フィルムの製造方法。
- 前記リップ部より押し出された溶融物から発生する昇華物質を含むガスを、前記リップ部の両側または片側に前記リップ部の全長に亘り設けられた吸引ノズルにより吸引することを特徴とする請求の範囲第1項から第5項のいずれか1項に記載の光学フィルムの製造方法。
- 前記遮蔽板と前記流延ダイとの間に前記吸引ノズルを設けることを特徴とする請求の範囲第6項に記載の光学フィルムの製造方法。
- 請求の範囲第1項から第7項のいずれか1項に記載の製造方法により製造されたことを特徴とする光学フィルム。
- 溶融した熱可塑性樹脂を含むフィルム構成材料を流延ダイのリップ部よりフィルム状に押出し、該溶融物を一対の回転ロールで挟むことにより冷却固化させて光学フィルムを製造する装置であって、
前記溶融物が前記一対の回転ロールに挟み込まれるニップの入口近傍であって、前記一対の回転ロールのうち少なくとも一方の回転ロールの表面近傍に、加熱される遮蔽板を備えたことを特徴とする光学フィルムの製造装置。
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JP2010505571A JP5333441B2 (ja) | 2008-03-27 | 2009-03-18 | 光学フィルムの製造方法および製造装置 |
US12/933,842 US20110018149A1 (en) | 2008-03-27 | 2009-03-18 | Optical film and method and apparatus for manufacturing the same |
CN2009801103661A CN101977753A (zh) | 2008-03-27 | 2009-03-18 | 光学膜及其制造方法和制造装置 |
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JP (1) | JP5333441B2 (ja) |
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JP2014061670A (ja) * | 2012-09-21 | 2014-04-10 | Dainippon Printing Co Ltd | 排煙装置、及び押出成形装置 |
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US9492332B2 (en) * | 2014-05-13 | 2016-11-15 | Clopay Plastic Products Company, Inc. | Breathable and microporous thin thermoplastic film |
CN107920926A (zh) | 2015-07-10 | 2018-04-17 | 比瑞全球有限公司 | 微孔透气膜和制造该微孔透气膜的方法 |
US11472085B2 (en) | 2016-02-17 | 2022-10-18 | Berry Plastics Corporation | Gas-permeable barrier film and method of making the gas-permeable barrier film |
KR101934486B1 (ko) * | 2016-09-20 | 2019-01-02 | 주식회사 엘지화학 | 슬립성이 우수한 광학 필름, 및 이를 포함하는 편광판 |
CN111099416B (zh) * | 2019-12-03 | 2020-08-28 | 南京贝迪电子有限公司 | 一种导光膜生产装置 |
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DE3006566A1 (de) * | 1980-02-21 | 1981-08-27 | Windmöller & Hölscher, 4540 Lengerich | Verfahren zur regelung der foliendicke von in flachfolien-extrusionsanlagen hergestellten flachfolien |
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- 2009-03-18 JP JP2010505571A patent/JP5333441B2/ja not_active Expired - Fee Related
- 2009-03-18 US US12/933,842 patent/US20110018149A1/en not_active Abandoned
- 2009-03-18 KR KR1020107021087A patent/KR101554376B1/ko active IP Right Grant
- 2009-03-18 CN CN2009801103661A patent/CN101977753A/zh active Pending
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JPS54100470A (en) * | 1978-01-25 | 1979-08-08 | Toray Ind Inc | Device for cooling molten polymer film |
JP2007125833A (ja) * | 2005-11-07 | 2007-05-24 | Kaneka Corp | フィルム成形方法、及びフィルム成形装置 |
JP2007160628A (ja) * | 2005-12-12 | 2007-06-28 | Fujifilm Corp | 熱可塑性樹脂フィルムの製造方法及び装置並びに熱可塑性樹脂フィルム |
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JP2014061670A (ja) * | 2012-09-21 | 2014-04-10 | Dainippon Printing Co Ltd | 排煙装置、及び押出成形装置 |
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US20110018149A1 (en) | 2011-01-27 |
JP5333441B2 (ja) | 2013-11-06 |
KR20100132505A (ko) | 2010-12-17 |
KR101554376B1 (ko) | 2015-09-18 |
CN101977753A (zh) | 2011-02-16 |
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