WO2006046480A1 - Nouvelle plaque d’extrusion de résine méthacrylique et procédé de fabrication idoine - Google Patents

Nouvelle plaque d’extrusion de résine méthacrylique et procédé de fabrication idoine Download PDF

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Publication number
WO2006046480A1
WO2006046480A1 PCT/JP2005/019389 JP2005019389W WO2006046480A1 WO 2006046480 A1 WO2006046480 A1 WO 2006046480A1 JP 2005019389 W JP2005019389 W JP 2005019389W WO 2006046480 A1 WO2006046480 A1 WO 2006046480A1
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Prior art keywords
methacrylic resin
plate
apparent density
polymer
gzml
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PCT/JP2005/019389
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English (en)
Japanese (ja)
Inventor
Shunji Kamiya
Yoshikazu Tsuruta
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Asahi Kasei Chemicals Corporation
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Priority to CN2005800340765A priority Critical patent/CN101035666B/zh
Priority to JP2006543089A priority patent/JP4711967B2/ja
Publication of WO2006046480A1 publication Critical patent/WO2006046480A1/fr

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    • 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
    • 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
    • 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
    • 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 methacrylic resin extruded plate for a light guide plate suitable for a display device, a signboard and the like, and a method for producing the same.
  • 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.
  • the thickness variation in the extrusion direction is small, but the thickness variation in the width direction is large, and the light incident from the light source lamp installed in the light source device is irregularly emitted, resulting in luminance uniformity. Inferior and high brightness cannot be obtained.
  • 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 methacrylic resin extruded material having a specific shape at a specific ratio, and used the extruded methacrylic resin plate as a light guide plate. As a result, it has been found that the brightness is increased and the brightness unevenness is reduced, and the present invention has been completed.
  • Thickness 2 For Omm methacrylic resin extruded plate, apparent density of 0.70 g Zml to 0.78 gZml of spherical methacrylic resin and apparent density of 0.63 gZml to 0.70 gZml. Columnar and Z or an apparent density of 0.63 gZml to 0.70 gZml of a flat methacrylic rosin polymer, the apparent density of the mixture is not less than 0.80 gZml, obtained by extrusion using the mixture A methacrylic resin extruded plate for a light guide plate, wherein the brightness uniformity is 80% or more,
  • the thickness of the extruded plate is 3.5 to 8.5 mm, and the thickness accuracy in the width direction of the extruded plate is within ⁇ 0.5% 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 spherical methacrylic resin used in the present invention is obtained by a suspension polymerization method.
  • the suspension polymerization method will be explained. First, a polymerization initiator and a chain transfer agent are uniformly dissolved in a monomer mixture composed 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. Can be 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, tub Examples include tilperoxypivalate, t-butylperoxy-2-ethylhexaate, cumylperoxy-2-ethylhexanoate, 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. Examples thereof include t-butyl mercaptan, n-butyl mercaptan, n-octyl mercaptan, n-dodecyl mercaptan and the like.
  • 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 methacrylic resin polymer which is an important constituent of the present invention, is 0.2 to 0. 5 mm, preferably 0.25-0.39 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.
  • the cylindrical methacrylic resin is a spherical methacrylic polymer obtained by the above suspension polymerization, supplied to an extruder with a vent, and extruded at a temperature of 220 to 260 ° C and a vent vacuum of 1.3 to 8 kPa. It can be extruded into strands, cooled with water, 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, 1 , 2, 2-tetrachloroethane and the like.
  • 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.
  • di-t-butyl peroxide dicumyl peroxide, methylethyl Ketone peroxide, di-t-butyl perphthalate, di-t-butyl perbenzoate, t-butyl peracetate, 2,5 dimethyl-2,5 di (tert-butyl) Rubberoxy) hexane, 1,1-bis (t-butylperoxy) -3,3,5 trimethylcyclohexane, 1,1-bis (t-butylperoxy) cyclohexane, di-t-amyl peroxide, benzoylper Oxide, cumene hydride peroxide, lauryl baroxide, azobisisobutanol diacetate, 1, 1'-azobiscyclohexanecarbo nitrile, 2 phenyl
  • 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, thiocresol, thioglycolic acid and esters thereof.
  • ethylenethioglycol The amount 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. For example, the confining force of the heat transfer area of the pre-heater is not insufficient, and this is preferable.
  • 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, etc. are 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 has a temperature of 200 to 250 ° C, 2.7 to 13.3 kPa, vacuum Feed the lower devolatilization tank to remove the polymer. Start out.
  • 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, includes a major axis (al) and a minor axis (b
  • the apparent density of the columnar or flat methacrylic rosin polymer is from 0.63 gZml to 0.6.
  • the mixing ratio of the spherical metataryl rosin polymer and the columnar and Z or flat methacrylic rosin polymer is such that the apparent density of the mixture is 0.80 gZml or more.
  • the apparent density of the mixture is 0.80 gZml or more, 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. In the case of the polymer particle size in the examples of the present application, the mixing ratio when the spherical metataryl rosin polymer is 100 parts by weight.
  • the columnar and Z or flat methacrylic rosin polymer is 10 to 600 parts by weight, preferably 15 to 500 parts by weight, and more preferably 15 to 400 parts by weight.
  • the extruded plate of the present invention can be produced by a usual melt extrusion method.
  • Spherical methallyl resin and cylindrical and z or flat methacrylic resin mixture are melted at 220-300 ° C, extruded into a plate through a T-die, 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 luminance uniformity is preferably 80% or more, because the occurrence of luminance spots is suppressed.
  • the metathalyl resin extruded plate of the present invention has the effect of maximizing the luminous efficiency of light incident from the light source lamp 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.
  • Thickness accuracy—A (%) (Maximum value—Average value) Z average value X 100 where “Thickness accuracy A” is the maximum thickness accuracy and “Thickness accuracy B” is the minimum thickness accuracy.
  • 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 methacrylic resin board of the present invention has an effect of reducing the luminance spots with high average luminance, that is, high luminous efficiency and high luminance uniformity of the light incident on the light source lamp force.
  • 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 4 kPa, 230 ° C, separated the polymer from unreacted monomers and solvent.
  • the polymer is continuously transferred to the extruder in a molten state, extruded into a strand from the die through the extruder, water-cooled (water temperature 60 ° C bath), cut with a strand cutter, and melt flow rate (ISO — 1139— Condl3) 1.
  • Polymer—C major axis (al), minor axis (bl), and length (L) are (al) 2. 773mm, (bl) 2. 689mm, (L) 3. 105mm, (bl) / ( al) 0.97, apparent density 0.667 gZml o
  • Polymer E (Manufacture of cylindrical methacrylic resin (polymer E)) Polymer — Continuously feed A into a 70mm ⁇ single screw extruder, 200 from cylinder temperature feed side. C-200 ° C-260 ° C-240 ° C-240 ° C-230 ° C-230 ° C-230 ° C-230. Extruded with C, cooled in a bath at a water temperature of 55 ° C., and cut with a strand cutter to obtain a cylindrical methacrylic resin (polymer E). Polymer — E major axis (al), minor axis (bl) and length (L) are (al) 3. 367mm, (bl) 2. 716mm, (L) 3. 315mm, (bl ) / (al) 0.81 and the apparent density was 0.64 gZml.
  • a 150 mm ⁇ single screw extruder having a T die die temperature: 250 ° C) for a mixture of polymer—A 50 parts by weight and polymer—C 50 parts by weight (apparent density 0.88 g / ml) (die temperature: 250 ° C.)
  • Cylinder temperature: 200 from the feed side C-210 ° C-210 ° C-260 ° C-260 ° C-240 ° C)) and temperature-controlled three polycinder rolls (roll temperature: 80 ° C)
  • extrusion sheet molding machine with a pulling device strength, extrusion was performed at an extrusion amount of 600 kgZhr to obtain a methacrylic resin extruded plate (extruded plate A) having a width of 1000 mm and a thickness of 6 mm.
  • Table 1 shows the results of measuring the thickness measurement points shown in Fig. 1 and calculating the plate thickness accuracy.
  • 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.
  • Polymer A (apparent density 0.76 gZml) and polymer C (apparent density 0.667 gZml) used in Example 1 were each extruded in the same manner as in Example 1, and extruded plate B and extruded plate C Obtained. As in Example 1, thickness measurement, brightness, and brightness spots were measured, and the results are shown in Table 1.
  • Extruded plate D was obtained in the same manner as in Example 1, except that the amount of the polymer mixed was 80 parts by weight of polymer-A and 20 parts by weight of polymer-C (apparent density 0.82 gZml). It was. Implementation Measurements similar to those in Example 1 were performed and the results are shown in Table 1.
  • Extruded plate E was obtained in the same manner as in Example 1 except that the amount of polymer mixed was 20 parts by weight of polymer-A and 80 parts by weight of polymer-C (apparent density 0.81 gZml). It was. Measurements similar to those of Example 1 were performed, and the results are shown in Table 1.
  • Extruded plate F was obtained in the same manner as in Example 1 except that the amount of the polymer mixed was 95 parts by weight of polymer-A and 5 parts by weight of polymer-C (apparent density 0.78 gZml). Measurements similar to those in Example 1 were performed, and the results are shown in Table 1.
  • Extruded plate G was obtained in the same manner as in Example 1, except that the amount of the polymer mixed was 5 parts by weight of polymer A and 95 parts by weight of polymer C (apparent density 0.72 gZml). Measurements similar to those in Example 1 were performed, and the results are shown in Table 1.
  • Cylindrical methacrylic resin used in Example 1 Extruded plate in the same manner except that it was a mixture (apparent density 0.84 g / ml) using cylindrical methacrylic resin E instead of C -I got J. Measurements similar to those of Example 1 were performed, and the results are shown in Table 1.
  • Example 1 Using the extrusion raw material of Example 1, a methacrylic resin extruded plate (extruded plate K) having a plate thickness of 8 mm was formed. The same measurement as in Example 1 was performed, and the results are shown in Table 1.
  • Weight coalescence (most part) Extruded plate Average thickness Maximum thickness Thickness of sugar thickness A Minimum thickness Thickness accuracy of thickness B Average brightness Brightness uniformity
  • Example 1 A 50 C: 50 extruded plate A 6.002 6.020 +0.30 5. 980 -0 37 2920 82 Comparative Example 1 A: 100 0 Extrusion plate B 6.006 6.078 +1. 20 5.927 — 1.32 2790 73 Comparative Example 2 0 C: 100 Extrusion plate C 5.995 6.066 +1. 18 5.929 -1. 10 2799 75
  • 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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  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)
  • Compositions Of Macromolecular Compounds (AREA)

Abstract

Selon l’invention, on réalise un moulage par extrusion en utilisant une plaque d’extrusion de résine méthacrylique d’une épaisseur comprise entre 2,0 et 15,0 mm, constituée d’un mélange d’une densité apparente supérieure ou égale à 0,80 g/ml, obtenu en mélangeant un polymère de résine méthacrylique sphérique d’une densité apparente comprise entre 0,70 g/ml et 0,78 g/ml et un polymère de résine méthacrylique cylindrique d’une densité apparente comprise entre 0,63 g/ml et 0,70 g/ml et/ou un polymère de résine méthacrylique plat d’une densité apparente comprise entre 0,63 g/ml et 0,70 g/ml. L'uniformité de brillance est réglée pour être supérieure ou égale à 80% et 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. L’invention concerne une plaque d’extrusion de résine méthacrylique pour plaque de guidage de lumière que l’on peut utiliser 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/JP2005/019389 2004-10-28 2005-10-21 Nouvelle plaque d’extrusion de résine méthacrylique et procédé de fabrication idoine WO2006046480A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
CN2005800340765A CN101035666B (zh) 2004-10-28 2005-10-21 新型甲基丙烯酸树脂挤压板及其制造方法
JP2006543089A JP4711967B2 (ja) 2004-10-28 2005-10-21 新規メタクリル樹脂押出板及びその製造方法

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
JP2004-314280 2004-10-28
JP2004314280 2004-10-28

Publications (1)

Publication Number Publication Date
WO2006046480A1 true WO2006046480A1 (fr) 2006-05-04

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PCT/JP2005/019389 WO2006046480A1 (fr) 2004-10-28 2005-10-21 Nouvelle plaque d’extrusion de résine méthacrylique et procédé de fabrication idoine

Country Status (5)

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JP (1) JP4711967B2 (fr)
KR (1) KR100884324B1 (fr)
CN (1) CN101035666B (fr)
TW (1) TW200630201A (fr)
WO (1) WO2006046480A1 (fr)

Citations (6)

* Cited by examiner, † Cited by third party
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
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

Also Published As

Publication number Publication date
JP4711967B2 (ja) 2011-06-29
CN101035666B (zh) 2010-05-12
TW200630201A (en) 2006-09-01
KR100884324B1 (ko) 2009-02-18
TWI310728B (fr) 2009-06-11
KR20070043814A (ko) 2007-04-25
CN101035666A (zh) 2007-09-12
JPWO2006046480A1 (ja) 2008-05-22

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