WO2006046481A1 - Procédé de fabrication de plaque d’extrusion de résine méthacrylique optique - Google Patents

Procédé de fabrication de plaque d’extrusion de résine méthacrylique optique Download PDF

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Publication number
WO2006046481A1
WO2006046481A1 PCT/JP2005/019390 JP2005019390W WO2006046481A1 WO 2006046481 A1 WO2006046481 A1 WO 2006046481A1 JP 2005019390 W JP2005019390 W JP 2005019390W WO 2006046481 A1 WO2006046481 A1 WO 2006046481A1
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Prior art keywords
methacrylic resin
plate
polymer
polymerization
apparent density
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PCT/JP2005/019390
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English (en)
Japanese (ja)
Inventor
Shunji Kamiya
Yoshikazu Tsuruta
Original Assignee
Asahi Kasei Chemicals Corporation
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Application filed by Asahi Kasei Chemicals Corporation filed Critical Asahi Kasei Chemicals Corporation
Priority to JP2006543090A priority Critical patent/JP4717008B2/ja
Priority to CN200580034052XA priority patent/CN101035665B/zh
Publication of WO2006046481A1 publication Critical patent/WO2006046481A1/fr

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Classifications

    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/0001—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems
    • G02B6/0011—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings specially adapted for lighting devices or systems the light guides being planar or of plate-like form
    • G02B6/0065—Manufacturing aspects; Material aspects
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
    • C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
    • C08J5/18—Manufacture of films or sheets
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
    • C08L33/04—Homopolymers or copolymers of esters
    • C08L33/06—Homopolymers or copolymers of esters of esters containing only carbon, hydrogen and oxygen, which oxygen atoms are present only as part of the carboxyl radical
    • C08L33/10—Homopolymers or copolymers of methacrylic acid esters
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • 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
    • 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
    • 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
    • C08J2333/00—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers
    • C08J2333/04—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters
    • C08J2333/06—Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides, or nitriles thereof; Derivatives of such polymers esters of esters containing only carbon, hydrogen, and oxygen, the oxygen atom being present only as part of the carboxyl radical
    • C08J2333/10—Homopolymers or copolymers of methacrylic acid esters
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L2205/00—Polymer mixtures characterised by other features
    • C08L2205/14—Polymer mixtures characterised by other features containing polymeric additives characterised by shape
    • G—PHYSICS
    • G02—OPTICS
    • G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
    • G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
    • G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour 
    • G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour  based on liquid crystals, e.g. single liquid crystal display cells
    • G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
    • G02F1/1333—Constructional arrangements; Manufacturing methods
    • G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
    • G02F1/1336—Illuminating devices
    • G02F1/133615—Edge-illuminating devices, i.e. illuminating from the side

Definitions

  • the present invention is used for office automation equipment such as personal computers and word processors, various monitors for displaying image signals, for example, display devices used for panel monitors, television monitors and the like, and surface light source devices for indoor and outdoor spaces.
  • the present invention relates to a method for producing a methacrylic resin extruded plate for a light guide plate suitable for a display device or a signboard.
  • Transparent thermoplastic resin and in particular, methallyl resin, in particular, has been used for many lighting applications because of its excellent light transmission and mechanical properties. It has come to be used as a light guide plate for backlights of display devices.
  • backlight systems There are two commonly used backlight systems: the so-called direct type, in which the light guide plate is sandwiched between the light source and the liquid crystal unit, and the edge light method in which the light source is attached to the edge of the light guide plate. The method has become mainstream.
  • development has continued under the concept of brighter, larger and thinner products, where the demand for higher brightness, larger size, and thinner display devices is stronger.
  • the light guide plate used in the light source device also has a great demand for a light guide plate that efficiently emits incident light of light incident from the light source lamp disposed on the side surface to the output surface. It is getting stronger.
  • a number of technical disclosures have been made so far regarding the method of increasing the brightness using the light guide plate.
  • a method of obtaining a uniform light emitting surface by dispersing and diffusing light diffusing particles in a light guide plate see, for example, Patent Document 1
  • a light scattering plastic material including fine particles having different refractive indexes in a light guide is disclosed.
  • Patent Document 2 the process is complicated.
  • Patent Document 1 Japanese Patent Publication No. 39-1194
  • Patent Document 2 JP-A-4-145485
  • the level can sufficiently meet the demands associated with the increase in size and thickness of display devices, such as brightness and luminance spots. It is the current situation that has been reached.
  • An object of the present invention is suitable for various monitors that display image signals, for example, display devices used for panel monitors, television monitors and the like, and display devices and signboards used for indoor and outdoor lighting devices.
  • An object is to provide a methacrylic resin extruded plate for a light guide plate and a method for producing the same.
  • the present inventors mixed a metataryl resin extruded material having an irregular shape with a metataryl resin extruded material having a fixed shape at a specific ratio, and then extrusion molding.
  • methacrylic resin plate used as a light guide plate it was found that the brightness was increased and the brightness unevenness was reduced, and the present invention was completed.
  • the apparent density between the apparent density methacrylic resin having an apparent density of 0.63 gZml to 0.78 gZml and the amorphous methacrylic resin polymer having an apparent density of 0.55 gZml to 0.63 gZml is at least 0.80 gZml.
  • the resulting mixture is extruded, and the thickness is 2.0-15. Omm, and the thickness accuracy in the width direction is within ⁇ 1.0% of the average thickness.
  • the methacrylic resin used in the present invention is methyl methacrylate!
  • the / soot can be obtained by copolymerizing 70% by weight or more of methacrylic acid methacrylate and a monomer having copolymerizability with these.
  • Monomers that are copolymerizable with these include butyl methacrylate, ethyl methacrylate, methyl methacrylate, propyl methacrylate, cyclohexyl methacrylate, methacrylate methacrylate, 2-ethylhexyl methacrylate, etc.
  • Methacrylic acid esters Methyl acrylate, Ethyl acrylate, Butyl acrylate, Acrylic acid cyclohexyl, Acrylic acid ester, Acrylic acid ester such as 2-Ethylhexyl acrylate, Methacrylic acid, Acrylic
  • the power of unsaturated acids such as acids is not limited to these.
  • the regular-shaped methacrylic resin extruded raw material used in the present invention is a spherical, cylindrical or flat methacrylic resin obtained by a polymerization reaction.
  • the unshaped metataryl resin extrusion raw material is methacrylic resin obtained by mechanically crushing a methacrylic resin molding once formed into a plate shape.
  • the spherical methacrylic resin is obtained by a suspension polymerization method.
  • the suspension polymerization method will be described.
  • a polymerization initiator and a chain transfer agent are uniformly dissolved in a monomer mixture consisting of methyl methacrylate or ethyl methacrylate and another monomer.
  • the homogeneously dissolved product is suspended in an aqueous medium containing a dispersion stabilizer and then held at a predetermined polymerization temperature for a certain period of time to complete the polymerization.
  • the resulting turbid polymer is filtered, washed with water and dried. Is obtained.
  • the polymerization initiator used in suspension polymerization may be a radical polymerization initiator known for polymerization of vinyl monomers.
  • azobisisobutyrate-tolyl 2,2 'azobis (2,4 dimethylvale-tolyl), dimethyl-2,2, -azobisisobutyrate, tert-butylperoxypivalate, tert-butylperoxy 2-
  • examples include ethyl hexaate, cumyl paroxy 2-ethyl hexanoate, benzoyl peroxide, lauroyl peroxide, and the like.
  • These radical polymerization initiators are preferably used in an amount of usually 0.01 to 2.0 parts by weight per 100 parts by weight of the monomer or monomer mixture.
  • the chain transfer agent used in the suspension polymerization may be a well-known one used for polymerization of methyl methacrylate.
  • t-butyl mercaptan examples thereof include n-octyl mercaptan and n-dodecyl mercaptan.
  • the amount of these chain transfer agents used is usually preferably in the range of 0.01 to 2.0 parts by weight per 100 parts by weight of the monomer or monomer mixture.
  • the dispersion stabilizer used in the suspension polymerization is not particularly limited. However, it is a poorly water-soluble inorganic compound such as calcium phosphate, calcium carbonate, and aluminum hydroxide, polybutal alcohol, polyethylene oxide, and cellulose derivative. -On-based polymer compounds, polyacrylic acid and its salts, polymethacrylic acid and its salts, copolymer of methacrylic acid ester and methacrylic acid and its salts, etc. .
  • the amount of these dispersion stabilizers used is preferably in the range of 0.01 to 5.0 parts by weight per 100 parts by weight of water.
  • water used in the suspension polymerization examples include pure water, ion exchange water, and deionized water.
  • the amount of water used is not particularly limited, but is preferably in the range of 100 to 250 parts by weight per 100 parts by weight of the monomer or monomer mixture! /.
  • the polymerization temperature for suspension polymerization is not particularly limited, but is about 60 to 120 ° C and is suitable for the polymerization initiator used.
  • a polymerization apparatus a polymerization vessel equipped with a well-known stirring blade, for example, a turbine blade, a fiddler blade, a propeller blade, a blue margin blade, or the like, is used, and the vessel is provided with a kaffle. Is common.
  • a release agent, a colorant, an ultraviolet absorber, an antioxidant, a light diffusing agent, a plasticizer, etc. may be suspended and polymerized.
  • the spherical methacrylate resin can be obtained by washing, dehydrating and drying by a known method.
  • the average particle size of the spherical methallyl succinic polymer which is an important constituent of the present invention, is 0.2 to 0.5 mm, preferably 0.25 to 0.39 mm. Good plate thickness accuracy can be obtained when the thickness is 0.2 mm or more, and a polymer having an average particle diameter of 0.5 mm or less can be stably produced. Further, when the apparent density is in the range of 0.70 g / ml to 0.78 g / ml, good thickness accuracy can be obtained.
  • Cylindrical methacrylic resin is a spherical polymer obtained by suspension polymerization.
  • Tacryl resin can be supplied to an extruder equipped with a vent, extruded at a temperature of 220 to 260 ° C and vented vacuum pressure of 1.3 to 8 kPa in a strand from an extrusion die, water cooled, and cut with a strand cutter.
  • a molten methacrylic resin polymer obtained by a known solution polymerization method or bulk polymerization method can be extruded into a strand shape from an extrusion die, cooled with water, and cut with a strand cutter.
  • the flat methacrylic resin can be extruded from an extruder with a vent in the same manner as in the production of the cylindrical methacrylic resin, and then cut with an underwater cutter.
  • the solvent in the solution polymerization method has a higher boiling point than the methyl methacrylate monomer, the methyl methacrylate monomer, and the monomer copolymerizable with methyl methacrylate at the bottom and inside of the distillation column.
  • aromatic compounds such as toluene, xylene, ethylbenzene, and jetylbenzene, aliphatic compounds such as octane and decane, alicyclic compounds such as decalin, esters such as butyl acetate and pentyl acetate, 1, And halogen compounds such as 1, 2, 2-tetrachloroethane.
  • aromatic compounds such as toluene, xylene, ethylbenzene, and jetylbenzene
  • aliphatic compounds such as octane and decane
  • alicyclic compounds such as decalin
  • esters such as butyl acetate and pentyl acetate
  • Xylene and ethylbenzene are preferable because they have an appropriate boiling point, are less degassed, and have no adverse effect on polymerization.
  • the amount of the solvent varies depending on the boiling point of the solvent.
  • the amount of the solvent is 30% by weight or less, preferably 20% by weight or less, based on the weight of the entire mixture at the time of polymerization. If no solvent is used during polymerization, bulk polymerization occurs.
  • the polymerization initiator used in the solution polymerization method and bulk polymerization method is one that decomposes actively at the polymerization temperature to generate radicals.
  • mercabtans are mainly used as the molecular weight regulator used in this case.
  • the mercaptans include n-butyl mercaptan, isobutyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan, sec-dodecyl mercaptan, t-butyl mercaptan, felt mercaptan, tiocresol, thioglycolic acid and the like.
  • esters and ethylenethioglycol examples of these molecular weight modifiers used is preferably 0.01 to 0.5% by weight based on the weight of the total reaction mixture.
  • the polymerization reactor uses a device that is stirred uniformly with a stirring blade such as a double helical ribbon or pitched paddle type.
  • the monomer or monomer solution is continuously supplied to the polymerization reactor, and the polymerization conversion rate of the monomer is substantially constant within a range of 0 to 70%.
  • the polymerization reaction is carried out at a temperature of 160 ° C.
  • the polymerization conversion rate is preferably 40% or more, and the load of the devolatilization process due to the volatile components is reduced. On the other hand, if it is 70% or less, for example, the piping pressure loss between the polymerization reactor and the pre-heater is reduced, so that the polymerization liquid can be easily transported.
  • the polymerization temperature is 120 ° C or higher, the polymerization rate is practical.
  • the polymerization temperature is 160 ° C or lower, the polymerization rate is appropriate, and the polymerization conversion rate can be easily adjusted. Further, it is preferable since the heat decomposability is not lowered.
  • the polymerization solution obtained by such a polymerization reaction is devolatilized and the polymer is taken out.
  • the devolatilizer an extruder with a multistage vent, a devolatilization tank, or the like is used.
  • the polymerization solution is superheated to a temperature of 200 to 290 ° C with a pre-heater or the like, has a sufficient space at the top, and 200 to 250 ° C, a temperature of 2.7 to 13 kPa, under vacuum Feed to the devolatilization tank and take out the polymer.
  • This polymer is continuously transferred to an extruder in a molten state, extruded through a die from a die into a strand, cooled with water, and cut with a strand cutter to obtain a cylindrical polymer.
  • the flat methacrylic resin can be extruded from an extruder in the same manner as in the production of the cylindrical methacrylic resin, and then cut with an underwater cutter.
  • a release agent, a colorant, an ultraviolet absorber, an antioxidant, a light diffusing agent, a plasticizer, and the like are added using a feed pump from the side portion of the extruder. That's right.
  • the shape of the columnar polymer which is an important component of the present invention, is defined by the major axis (al), minor axis (b 1), and length (L) of the cross section.
  • the apparent density of the columnar or flat methacrylic rosin polymer is from 0.63 gZml to 0.6.
  • the amorphous metataryl rosin polymer which is an important constituent of the present invention, is formed into a plate shape by melt extrusion or the like from the above-mentioned suspension polymerization, solution polymerization, or bulk polymerization. It is obtained by mechanically grinding the material.
  • an impact pulverizer such as an impact crusher, a hammer crusher or a shear pulverizer such as a cutter mill can be used.
  • the cutter mill is preferable because the size of the pulverized product can be adjusted depending on the size of the screen holes.
  • a screen having a diameter of about 8 to 12 ⁇ is usually used, and an irregularly-shaped methallyl rosin polymer that has passed through this screen is used in the present invention.
  • the regular-shaped methacrylic resin and the irregular-shaped methacrylic resin polymer are mixed and used as a raw material for extruding methallyl resin. It is important that the mixing ratio of the regular-shaped methacrylic resin and the irregular-shaped methacrylic resin polymer is mixed so that the apparent density of the mixture is 0.80 gZml or more. When the apparent density of the mixture is 0.80 gZml or more, the extrusion stability is excellent, and an extruded plate with good thickness accuracy can be obtained.
  • the preferred mixing ratio of each polymer varies depending on the size of the polymer.
  • the amorphous methacrylic resin is 5 to 380 parts by weight, preferably 10 to 330 parts by weight, with respect to 100 parts by weight of the regular methacrylic resin.
  • the amount is preferably 10 to 230 parts by weight.
  • the proportion of the spherical, cylindrical, Z or flat methallyl slag polymer in the regular-shaped methacrylic slag polymer is cylindrical, Z or flat methacrylic slag relative to 100 parts by weight of the spherical methallyl succinic polymer.
  • the fat polymer is 0 to 400 parts by weight, preferably 0 to 250 parts by weight, and more preferably 0 to 150 parts by weight.
  • the extruded plate of the present invention can be produced by a usual melt extrusion method. For example, a mixture of the regular shape methacrylic resin and the irregular shape methacrylic resin polymer of the present invention is melted at 220 to 300 ° C., then extruded into a plate shape through a T-die, the surface is finished with a polishing roll, cooled, and then cut. A plate-like body can be obtained.
  • the plate thickness accuracy is the difference between the average value of the plate thickness measured at intervals of 50 mm and the maximum and minimum values of the measurement points for a plate having a width of 1000 mm.
  • the plate thickness accuracy is within ⁇ 1.0% of the average plate thickness, preferably within ⁇ 0.5%.
  • the plate thickness accuracy is within ⁇ 0.5% of the average plate thickness.
  • the metathalyl resin extruded plate of the present invention has the effect of maximally improving the light emission efficiency of light that has also entered the light source lamp force and reducing luminance spots.
  • An electromagnetic shaking sieving meter (electromagnetic vibration AS200 DISIT manufactured by Mitamura Riken Kogyo Co., Ltd.) was used. Sample lOOg is placed on top of the 7-stage sieve of the size 500-425-355-300-250-150-150, and shaken with a sieve shaker for 10 minutes, then spherical on each sieve. The metataryl rosin polymer was weighed, a cumulative residual distribution curve was written, the median diameter was determined, and the average particle diameter was obtained. For polymers with a small average particle size, measurements were made using a seven-stage sieve with a nominal size of 300-250-180-125-100-63-63.
  • a 1000 mm wide plate shown in Fig. 1 measurements were made up to 0.00 lmm using a 19 point outside micrometer (MDC-25M manufactured by Mitutoyo Corporation) at 50 mm intervals. The average value of each measurement point was determined, and the plate thickness accuracy was calculated from the average value and the maximum value and minimum value of each measurement point.
  • the plate thickness accuracy of the maximum thickness is “plate thickness accuracy A”
  • the plate thickness accuracy of the minimum thickness is “plate thickness accuracy B”.
  • Thickness accuracy—A (%) (Maximum value—Average value) Z Average value X 100 (1)
  • Sheet thickness accuracy B (%) (Minimum value average value) Z Average value X 100 (2)
  • a cold cathode tube of 3mm ⁇ (made by Harrison Electric Co., Ltd.) is installed as a light source on both end faces of the light guide plate at the length of 319mm, and Ray White 75 (made by Kimoto) is used as a light reflecting sheet. And two light diffusion sheets D121 (made by Gidden) were placed on the top of the light guide plate.
  • the cold cathode tube was charged with a voltage of 12V from a DC voltage stabilizer and lit for 20 minutes after being lit for 20 minutes.
  • the luminance meter (CA-1000: manufactured by Minolta) installed at a position distant from the light emitting surface vertically 19 X horizontal
  • the average luminance was calculated from the 361 measured values obtained in the above.
  • the uniformity was calculated from the obtained 361 measured values as an evaluation index of luminance spots by the following formula (3).
  • Luminance uniformity (%) Minimum luminance value Z Maximum luminance value X 100 (3)
  • the polymerization solution was continuously taken out from the polymerization reactor, then heated to 260 ° C with a heating plate, and cast and dropped through the space between the heating plates.
  • a devolatilization tank maintained at 2.7 kPa, 230 ° C, separated the polymer from unreacted monomers and solvent.
  • the polymer is continuously transferred to the extruder in a molten state, extruded through the extruder into a strand from a die, water-cooled (water temperature: 60 ° C bath), cut with a strand cutter, and melt flow rate ( I SO 1139 Condi 3) 1.
  • a 10-minute cylindrical methacrylic resin (polymer B) was obtained.
  • the major axis (al), minor axis (bl), and length (L) of polymer—B are (al) 2. 773mm, (bl) 2. 689mm, (L) 3. 105mm, (bl) / ( al) It was 0.97 and the apparent density was 0.67 gZml.
  • polymer B In the production process of polymer B, instead of extruding into a strand from a die and then cooling with water and then cutting with a cutter, it is cut with an underwater cut method that extrudes and cuts into water from a die, and melt flowlay HISO-1139—Condl3) l.
  • Polymer — D major axis (a2), minor axis (b2), thickness (T) are (a2) 3. 178mm, (b2) 3. 089mm, (T) l. 505mm, (b2) / (a2) 0.97, apparent density 0.668 g / ml.
  • Polymer — 150mm ⁇ single screw extrusion with A and T die for sheet die temperature: 250 ° C
  • Machine cylinder temperature: 200 ° C -210 ° C -210 ° C -260 ° C -260 ° C -240 ° C) from the feed side
  • three poly cinder rolls roll temperature: 80 ° C)
  • an extrusion sheet forming machine comprising a take-up device, and extruded with a extrusion amount of 600 kgZhr to obtain a methacrylic resin extruded plate having a width of 1000 mm and a thickness of 6 mm.
  • this extruded plate was pulverized by using a pulverizer (U10-30120XLFX type) (screen: 10 mm ⁇ ) manufactured by Horai Co., Ltd. to obtain an irregular-shaped metataryl rosin polymer (polymer D).
  • the apparent density of Polymer-D was 0.60 gZml.
  • the resulting extruded plate was cut into a size of 241 mm in width and 319 mm in length using a circular saw, and the cut surface of the cut plate was cut using a precision polishing machine (PLA—Beauty: manufactured by Megalotech-Power Co., Ltd.). Polish and then puffed to give a mirror finish.
  • PPA Precision Polishing machine
  • screen printing was performed on one side of the light guide plate to obtain a light guide plate. Table 1 shows the measurement results of luminance and luminance spots.
  • Extruded plate B was obtained in the same manner as in Example 1 except that the amount was 88 g / ml). As in Example 1, thickness measurement, brightness, and brightness spots were measured, and the results are shown in Table 1.
  • Extruded plate C was obtained in the same manner as in Example 1 except that the mixture (polymer apparently used in Example 1) had a blending amount of 400 parts by weight (apparent density 0.75 g / ml). As in Example 1, thickness measurement, brightness, and brightness spots were measured, and the results are shown in Table 1. ⁇ Comparative Examples 2, 3>
  • Polymer A (apparent density 0.76 gZml) and polymer D (apparent density 0.60 gZml) used in Example 1 were each extruded in the same manner as in Example 1 and extruded plate D and extruded plate E Obtained.
  • thickness measurement, luminance, and luminance spots were measured, and the results are shown in Table 1.
  • Example 1 The polymer used in Example 1 was replaced with Example 1 except that the polymer (A50 parts by weight) and the polymer (B50 parts by weight) were used instead of A100 parts by weight. In the same manner, Extruded Plate-F was obtained. As in Example 1, thickness measurement, luminance, and luminance spots were measured, and the results are shown in Table 1.
  • Extruded plate-G was obtained in the same manner as in Example 1, except that the mixture was changed to a mixture using the polymer C instead of the polymer B used in Example 3 (apparent density 0.87 gZml). As in Example 1, thickness measurement, luminance, and luminance spots were measured, and the results are shown in Table 1.
  • Example 1 Using the extruded raw material of Example 1, a methacrylic resin extruded plate (extruded plate H) having a thickness of 8 mm was formed, and in the same manner as in Example 1, thickness measurement, luminance, and luminance unevenness were measured. The results are shown in Table 1
  • the light guide plate of the present invention is used in office automation equipment such as personal computers and word processors, various monitors for displaying image signals, for example, display devices used for panel monitors, television monitors and the like, and lighting devices for indoor and outdoor spaces. It can be suitably used for display devices and signboards.
  • FIG. 1 Shows thickness measurement points in the present invention.
  • FIG. 2 shows an example of a luminance evaluation method in an edge light type liquid crystal light source device using the light guide plate of the present invention.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Manufacturing & Machinery (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Medicinal Chemistry (AREA)
  • Polymers & Plastics (AREA)
  • Health & Medical Sciences (AREA)
  • Optics & Photonics (AREA)
  • General Physics & Mathematics (AREA)
  • Materials Engineering (AREA)
  • Nonlinear Science (AREA)
  • Mathematical Physics (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Mechanical Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Planar Illumination Modules (AREA)

Abstract

L’invention concerne une plaque d’extrusion de résine méthacrylique constituée d’un mélange d’une densité apparente supérieure ou égale à 0,80 g/ml, obtenu en mélangeant un polymère de résine méthacrylique de forme donnée d’une densité apparente comprise entre 0,63 g/ml et 0,78 g/ml et un polymère de résine méthacrylique de forme indéfinie d’une densité apparente comprise entre 0,55 g/ml et 0,63 g/ml. La précision d’épaisseur de plaque dans le sens de la largeur est réglée pour être inférieure à ±1,0% de l’épaisseur de plaque moyenne. La plaque d’extrusion de résine méthacrylique pour plaque de guidage de lumière s’utilise de préférence pour des dispositifs de bureautique comme un ordinateur personnel et un traitement de texte, des dispositifs d’affichage servant à divers moniteurs affichant un signal d’image comme un écran d'ordinateur ou un écran de télévision, des dispositifs d’affichage servant à des panneaux de signalisation et à des dispositifs d’éclairage intérieurs et extérieurs.
PCT/JP2005/019390 2004-10-28 2005-10-21 Procédé de fabrication de plaque d’extrusion de résine méthacrylique optique WO2006046481A1 (fr)

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JP2006543090A JP4717008B2 (ja) 2004-10-28 2005-10-21 光学用メタクリル樹脂押出板の製造方法
CN200580034052XA CN101035665B (zh) 2004-10-28 2005-10-21 光学用甲基丙烯酸树脂挤压板的制造方法

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JP2021504760A (ja) * 2017-12-15 2021-02-15 エルジー・ケム・リミテッド ウェアラブルデバイス

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CN106567351A (zh) * 2016-10-28 2017-04-19 河南省路嘉路桥股份有限公司 反光立柱帽

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JP2002120273A (ja) * 2000-10-13 2002-04-23 Sumitomo Chem Co Ltd 板厚精度に優れた樹脂板の製造方法
JP2003234005A (ja) * 2001-11-20 2003-08-22 Asahi Kasei Corp 導光板
JP2003270447A (ja) * 2002-03-15 2003-09-25 Asahi Kasei Corp 導光体
JP2003287626A (ja) * 2002-03-27 2003-10-10 Mitsubishi Rayon Co Ltd 導光板用アクリル樹脂板状物およびその製造方法、並びに導光板、それを含む面発光装置および表示装置
JP2004237585A (ja) * 2003-02-06 2004-08-26 Mitsubishi Rayon Co Ltd 板状重合物の製造方法
JP2004237645A (ja) * 2003-02-07 2004-08-26 Mitsubishi Rayon Co Ltd ベルト式連続製板装置および板状重合物の製造方法

Patent Citations (6)

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Publication number Priority date Publication date Assignee Title
JP2002120273A (ja) * 2000-10-13 2002-04-23 Sumitomo Chem Co Ltd 板厚精度に優れた樹脂板の製造方法
JP2003234005A (ja) * 2001-11-20 2003-08-22 Asahi Kasei Corp 導光板
JP2003270447A (ja) * 2002-03-15 2003-09-25 Asahi Kasei Corp 導光体
JP2003287626A (ja) * 2002-03-27 2003-10-10 Mitsubishi Rayon Co Ltd 導光板用アクリル樹脂板状物およびその製造方法、並びに導光板、それを含む面発光装置および表示装置
JP2004237585A (ja) * 2003-02-06 2004-08-26 Mitsubishi Rayon Co Ltd 板状重合物の製造方法
JP2004237645A (ja) * 2003-02-07 2004-08-26 Mitsubishi Rayon Co Ltd ベルト式連続製板装置および板状重合物の製造方法

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2021504760A (ja) * 2017-12-15 2021-02-15 エルジー・ケム・リミテッド ウェアラブルデバイス
JP2022103280A (ja) * 2017-12-15 2022-07-07 エルジー・ケム・リミテッド ウェアラブルデバイス
JP7412843B2 (ja) 2017-12-15 2024-01-15 エルジー・ケム・リミテッド ウェアラブルデバイス

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KR100857501B1 (ko) 2008-09-08
TWI275477B (en) 2007-03-11
JP4717008B2 (ja) 2011-07-06
JPWO2006046481A1 (ja) 2008-05-22
TW200628287A (en) 2006-08-16
CN101035665B (zh) 2010-06-16
CN101035665A (zh) 2007-09-12
KR20070043815A (ko) 2007-04-25

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