WO2011162306A1 - スチレン系導光板 - Google Patents
スチレン系導光板 Download PDFInfo
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- WO2011162306A1 WO2011162306A1 PCT/JP2011/064312 JP2011064312W WO2011162306A1 WO 2011162306 A1 WO2011162306 A1 WO 2011162306A1 JP 2011064312 W JP2011064312 W JP 2011064312W WO 2011162306 A1 WO2011162306 A1 WO 2011162306A1
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- styrene
- light guide
- guide plate
- resin
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B1/00—Optical elements characterised by the material of which they are made; Optical coatings for optical elements
- G02B1/04—Optical elements characterised by the material of which they are made; Optical coatings for optical elements made of organic materials, e.g. plastics
- G02B1/045—Light guides
Definitions
- the present invention relates to a light guide plate made of a styrene resin using a styrene monomer as a raw material.
- backlights for liquid crystal displays there are direct type backlights in which light sources are arranged in front of the display device and edge light type backlights in which they are arranged on the side surfaces.
- the light guide plate is built into the edge-light type backlight and plays the role of guiding the light from the side to the liquid crystal panel, and is used in a wide range of applications such as televisions, desktop personal computers, notebook personal computers, mobile phones, car navigation systems, etc. .
- Acrylic resin represented by PMMA polymethyl methacrylate
- PMMA polymethyl methacrylate
- Patent Document 1 has been proposed as an improvement technique of MS resin such as water absorption and reduction of discoloration during molding.
- Patent Document 1 discloses a light guide plate having a weight average molecular weight (Mw) of 60 to 170,000, a residual monomer amount of 3000 ⁇ g / g or less, and an oligomer amount of 2% or less.
- Mw weight average molecular weight
- Patent Document 1 discloses a light guide plate having a weight average molecular weight (Mw) of 60 to 170,000, a residual monomer amount of 3000 ⁇ g / g or less, and an oligomer amount of 2% or less.
- Mw weight average molecular weight
- the water absorption is high and the dimensional stability tends to be worse than that of a styrene resin using a styrene monomer as a raw material.
- Patent Document 2 a styrene monomer- (meth) acrylic acid monomer copolymer has been proposed in Patent Document 2 as an example of improving the heat resistance of a light guide plate using a resin made from a styrene monomer.
- Patent Document 2 a styrene monomer comprising 95.5 to 99% by weight of a styrenic monomer and 1 to 4.5% by weight of a (meth) acrylic acid monomer and having an Mw of 160 to 350,000.
- An object of the present invention is to provide a light guide plate made of a styrene resin using a styrene monomer as a raw material, which has excellent heat resistance and little yellowing during molding.
- a light guide plate comprising a styrene resin having a methanol-soluble component of 1.5% by mass or less and a weight average molecular weight (Mw) of 150,000 to 450,000.
- Mw weight average molecular weight
- the total amount of residual styrene monomer and residual polymerization solvent in the styrene resin is 500 ⁇ g / g or less, and the total amount of styrene dimer and trimer is 5000 ⁇ g / g or less (1 ) Or (2).
- the styrene resin is a resin obtained by polymerizing a styrene monomer having a 4-t-butylcatechol concentration of less than 10 ⁇ g / g. The light guide plate described.
- the light guide plate of the present invention has high heat resistance, thermal deformation during use can be suppressed, and yellowing during molding can be prevented. Moreover, compared with PMMA and MS resin, it has low water absorption and is inexpensive.
- the light guide plate of the present invention is a molding method such as injection molding or extrusion molding of a styrene resin or a composition obtained by adding a light diffusing agent, an ultraviolet absorber, an antioxidant or the like to a styrene resin as necessary.
- a styrene resin can be obtained by polymerizing a styrene monomer.
- the styrene monomer is an aromatic vinyl monomer, such as styrene, ⁇ -methyl styrene, o-methyl styrene, p-methyl styrene, or a mixture of two or more, preferably styrene.
- Examples of the polymerization method of the styrene monomer include known styrene polymerization methods such as a bulk polymerization method, a solution polymerization method, and a suspension polymerization method. In terms of quality and productivity, bulk polymerization or solution polymerization is preferred, and continuous polymerization is preferred.
- the solvent for the solution polymerization method for example, alkylbenzenes such as benzene, toluene, ethylbenzene, and xylene, ketones such as acetone and methyl ethyl ketone, aliphatic hydrocarbons such as hexane and cyclohexane, and the like can be used.
- a polymerization initiator and a chain transfer agent can be used as needed during the polymerization of the styrene resin.
- organic peroxides such as benzoyl peroxide, t-butylperoxybenzoate, 1,1-di (t-butylperoxy) cyclohexane, 1,1-bis (t-butylperoxy)- 3,3,5-trimethylcyclohexane, 2,2-bis (4,4-di-t-butylperoxycyclohexyl) propane, t-butylperoxyisopropyl carbonate, dicumyl peroxide, t-butylcumyl peroxide, t-butyl peroxyacetate, t-butylperoxy-2-ethylhexanoate, polyether tetrakis (t-butylperoxycarbonate), ethyl-3,3-di (t-butylperoxy) butyrate, t-
- the polymerization step it is preferable to control the reaction by adjusting the polymerization temperature or the like so that the resin has a targeted molecular weight distribution using a known complete mixing tank type stirring tank or tower reactor.
- the polymerization solution containing the polymer exiting the polymerization step is transferred to the devolatilization step, and unreacted monomers and polymerization solvent are removed.
- the devolatilization process includes a vacuum devolatilization tank with a heater, a vented devolatilization extruder, and the like.
- the polymer in the molten state that has exited the devolatilization step is transferred to the granulation step.
- the molten resin is extruded in a strand form from a porous die and processed into a pellet shape by a cold cut method, an air hot cut method, or an underwater hot cut method.
- the methanol-soluble content in the styrene-based resin is 1.5% by mass or less, more preferably 1.0% by mass or less, and still more preferably 0.8% by mass or less. If the methanol soluble content exceeds 1.5% by mass, the light guide plate may have insufficient heat resistance and may be thermally deformed.
- the methanol-soluble component is the amount of the component soluble in methanol in the resin.
- the styrene oligomer styrene dimer, styrene trimer
- white oil silicone oil, etc.
- Low molecular weight components such as various additives, residual monomers, and residual polymerization solvents are included.
- Methanol-soluble matter suppresses the amount of styrene oligomer (styrene dimer, styrene trimer) generated as a by-product in the polymerization process, adjusts the amount of additives such as white oil, and reduces the amount of residual styrene monomer and residual polymerization solvent Can be reduced.
- methanol-soluble component in the present invention was performed by the following method. Styrenic resin P (g) is precisely weighed, 50 mL of tetrahydrofuran is added and dissolved at room temperature (25 ° C.) for 1 hour. After dissolution, add 5 mL of ethanol and mix well. Next, the dissolved solution is put into a beaker containing 400 mL of methanol, and a component (resin component) insoluble in methanol is precipitated while stirring at room temperature. After stirring for 15 minutes, a drop of hydrochloric acid is added and the mixture is further stirred at room temperature for 10 minutes.
- Styrenic resin P (g) is precisely weighed, 50 mL of tetrahydrofuran is added and dissolved at room temperature (25 ° C.) for 1 hour. After dissolution, add 5 mL of ethanol and mix well. Next, the dissolved solution is put into a beaker containing 400 mL of methanol, and a component (
- the weight average molecular weight (Mw) of the styrene resin is 150,000 to 450,000, more preferably 200,000 to 400,000.
- the weight average molecular weight (Mw) can be controlled by the reaction temperature of the polymerization process, the residence time, the type and addition amount of the polymerization initiator, the type and addition amount of the chain transfer agent, the type and amount of the solvent used during the polymerization, and the like. it can.
- the weight average molecular weight (Mw), Z average molecular weight (Mz), and number average molecular weight (Mn) were measured under the following conditions using gel permeation chromatography (GPC).
- GPC model Shodex GPC-101 manufactured by Showa Denko Column: PLgel 10 ⁇ m MIXED-B manufactured by Polymer Laboratories
- Mobile phase Tetrahydrofuran Sample concentration: 0.2% by mass
- Temperature 40 ° C oven, 35 ° C inlet, 35 ° C detector
- Detector Differential refractometer
- the molecular weight in the present invention is calculated as the molecular weight in terms of polystyrene by calculating the molecular weight at each elution time from the elution curve of monodisperse polystyrene.
- the Vicat softening temperature of the styrenic resin is preferably 100 ° C. or higher, more preferably 103 ° C. or higher. When the temperature is less than 100 ° C., the heat resistance becomes insufficient at the time of use as a light guide plate, and heat deformation may occur.
- the Vicat softening temperature was measured according to JIS K 7206 at a heating rate of 50 ° C./hr and a test load of 50 N.
- the total of residual monomers and residual polymerization solvent (total volatile content) in the styrene polymer is preferably 500 ⁇ g / g or less, more preferably 350 ⁇ g / g or less.
- the residual monomer and the residual polymerization solvent are components that are part of the methanol-soluble matter but have a low molecular weight and have a large effect on heat resistance.
- the residual monomer and the residual polymerization solvent have high volatility, for example, when the light guide plate is extruded by extrusion molding, it may volatilize at the outlet of the die and condense into the die, which may cause eye strain. Appearance defects will occur if the eyes are attached to the extruded light guide plate. Even in the case of injection molding, gas is generated during injection molding, which may cause molding defects.
- the residual monomer and the residual polymerization solvent are the amount of the monomer remaining in the resin and the residual polymerization solvent, and examples thereof include styrene, ethylbenzene, toluene and the like.
- the amount of the residual monomer and the residual polymerization solvent can be adjusted by conditions such as the configuration of the devolatilization process and the temperature and the degree of vacuum in the devolatilization process.
- the amount of residual monomer and residual polymerization solvent was precisely weighed 0.2 g of a styrene resin, dissolved in 10 ml of tetrahydrofuran containing p-diethylbenzene as an internal standard substance, and measured using a capillary gas chromatograph under the following conditions.
- Capillary gas chromatograph GC-4000 (manufactured by GL Sciences Inc.) Column: GS Science InertCap WAX, inner diameter 0.25 mm, length 30 m, film thickness 50 ⁇ m
- Injection temperature 180 ° C
- Detector temperature 210 ° C Split ratio: 5/1
- the total amount of dimer and trimer of the styrene monomer in the styrene resin is preferably 5000 ⁇ g / g or less, more preferably 4000 ⁇ g / g or less.
- the total amount of the dimer and trimer of the styrene monomer exceeds 5000 ⁇ g / g, the methanol-soluble component increases and the heat resistance of the light guide plate becomes insufficient.
- dimers and trimers of styrene monomers include those that are by-produced during the polymerization reaction in the polymerization process and those that are generated by thermal decomposition in the devolatilization step.
- a method of suppressing dimers and trimers of styrene monomer by-produced in the polymerization process a fully mixed tank reactor is used at the initial stage of polymerization, and the concentration of styrene monomer in the reactor is lowered. The method of superposing
- Examples of a method for suppressing dimers and trimers of styrene monomers generated in the devolatilization step include a method of lowering the resin temperature in the devolatilization step and shortening the residence time.
- the 4-t-butylcatechol concentration in the styrene monomer supplied to the polymerization step is preferably less than 10 ⁇ g / g, more preferably less than 3 ⁇ g / g.
- the 4-t-butylcatechol concentration is 10 ⁇ g / g or more, the yellowishness of the light guide plate may become strong.
- Commercially available styrenic monomers include 10 to 30 ⁇ g / g of 4-tert-butylcatechol as a polymerization inhibitor.
- the concentration of 4-t-butylcatechol in the styrene monomer can be reduced by using activated alumina as an adsorbent.
- the concentration of 4-t-butylcatechol in the styrene monomer was measured by the following method. 50 mL of styrenic monomer was placed in a separatory funnel, 10 ml of 1N sodium hydroxide was added, and the mixture was shaken for about 2 minutes. After separating into two layers, the lower layer solution was extracted, the absorbance (wavelength 486 nm) was measured using a spectrophotometer, and the concentration was calculated from a calibration curve prepared in advance.
- the bending strength of the styrene resin is preferably 70 MPa or more, more preferably 90 MPa or more. If it is less than 70 MPa, the light guide plate becomes brittle due to insufficient strength.
- the optical properties of styrene-based resin include total light transmittance and haze (injection molding test piece (thickness) at an injection molding machine (IS130FII-3A) manufactured by Toshiba Machine Co., Ltd. at a cylinder temperature of 230 ° C and a mold temperature of 40 ° C. Measurement was performed in accordance with JIS K-7105 using a thickness of 2 mm and dimensions of 40 mm ⁇ 40 mm). From the viewpoint of transparency, the total light transmittance of the styrene resin is preferably 90% or more, and the haze of the styrene resin is preferably 1.0% or less, more preferably less than 0.5%.
- YI yellowness
- NDJ4000 colorimetric color difference meter
- the ultraviolet absorber has a function of suppressing deterioration and coloring caused by ultraviolet rays.
- UV absorbers such as those of formaldehyde and formamidine. These can be used alone or in combination of two or more thereof, and a light stabilizer such as hindered amine may be used in combination.
- the light guide plate made of styrene resin can be molded by a molding method according to the purpose such as injection molding, extrusion molding, compression molding or the like.
- the thickness of the styrene resin light guide plate is preferably 0.1 to 8.0 mm, more preferably 0.2 to 4.0 mm.
- TBC 4-t-butylcatechol
- styrene contains 10 to 30 ⁇ g / g of TBC as a polymerization inhibitor. 1 part by mass of activated alumina is added to 100 parts by weight of commercially available styrene having a TBC concentration of 12 ⁇ g / g, mixed to adsorb TBC, the activated alumina is removed with a filter paper, and the TBC concentration is less than the detection limit (1 ⁇ g / g). Styrene was obtained. The TBC concentration in styrene supplied to the polymerization step was adjusted by adding TBC to styrene.
- the polymerization reactor was configured by connecting in series a first reactor that was a complete mixing tank, a second reactor, and a third reactor that was a plug flow reactor with a static mixer.
- the capacity of each reactor was 39 liters for the first reactor, 39 liters for the second reactor, and 16 liters for the third reactor.
- a raw material solution was prepared with the raw material composition shown in Table 1.
- the raw material solution was continuously supplied to the first reactor at a flow rate shown in Table 1.
- the polymerization initiator was added to and mixed with the raw material solution at the inlet of the first reactor so as to have the addition concentration shown in Table 1 (concentration based on mass relative to the raw styrene).
- the polymerization initiators described in Table 1 are as follows. White oil used was ExxonMobil Cristol N352 and was supplied to the outlet of the third reactor.
- Polymerization initiator-1 2,2-bis (4,4-t-butylperoxycyclohexyl) propane (Pertetra A manufactured by NOF Corporation was used)
- Polymerization initiator-2 1,1-bis (t-butylperoxy) cyclohexane (Perhexa C manufactured by NOF Corporation was used)
- Polymerization initiator-3 t-amyl peroxy isononanoate (Lupelox 570 manufactured by Arkema Yoshitomi was used)
- Chain transfer agent-1 ⁇ -methylstyrene dimer (NOFMER MSD manufactured by NOF Corporation) was used.
- the solution containing the polymer continuously taken out from the third reactor was introduced into a vacuum devolatilization tank with a preheater constituted by two stages in series, and the preheater was adjusted to the resin temperature shown in Table 1. The temperature of was adjusted.
- the strand was extruded from a porous die into a strand shape, and the strand was cooled and cut by a cold cut method to be pelletized. Further, ethylene bisstearylamide was added to the obtained pellets as an external lubricant at a concentration of 100 ⁇ g / g and dry blended.
- the bending strength was tested in accordance with JIS K 7171.
- melt mass flow rate was measured as a flow characteristic.
- the melt mass flow rate was measured in accordance with JIS K-7210 under the conditions of 200 ° C. and 49 N load.
- Table 2 shows the characteristics of each resin.
- a light guide plate made of a styrene resin using a styrene monomer as a raw material which has excellent heat resistance and little yellowing during molding, can be obtained.
- the light guide plate of the present invention can be suitably used in a wide range of applications such as televisions, desktop personal computers, notebook personal computers, mobile phones, car navigation systems and the like.
- applications such as televisions, desktop personal computers, notebook personal computers, mobile phones, car navigation systems and the like.
- the entire contents of the specification, claims, and abstract of Japanese Patent Application No. 2010-143339 filed on June 24, 2010 are incorporated herein as the disclosure of the specification of the present invention. Is.
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- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Planar Illumination Modules (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
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Abstract
Description
導光板には、PMMA(ポリメチルメタクリレート)に代表されるアクリル樹脂が主に使用されるが、これらは透明性等の光学特性は優れるものの、吸水性が高い傾向があり、成形品の反りの問題や寸法変化が発生する場合がある。
特許文献1では、重量平均分子量(Mw)6~17万、残存モノマー量3000μg/g以下、更にオリゴマー量が2%以下の導光板が開示されている。しかし、吸水性が高く寸法安定性がスチレン系単量体を原料とするスチレン系樹脂よりも悪い傾向にある。
特許文献2では、スチレン系単量体95.5~99重量%と(メタ)アクリル酸系単量体1~4.5 重量%からなり、Mwが16~35万であるスチレン系単量体-(メタ) アクリル酸系単量体系共重合体からなる導光板が開示されているが、吸水性が高く、吸水反り量がスチレン系単量体を原料とするスチレン系樹脂よりも大きい傾向を示す。
一方、昨今の省電力化の流れから、光源の冷陰極管からLEDへの変換が進行中で、導光板の黄変を引き起こす紫外線領域での発光スペクトルのほとんどない白色LED使用の際は、スチレン系単量体を原料としたスチレン系樹脂からなる導光板も安価で有用性が大きいものと期待されている。
しかしながら、今までの導光板では、耐熱性と成形時の黄変抑制の両立が必ずしも充分ではなかった。
(1)メタノール可溶分が1.5質量%以下であり、かつ重量平均分子量(Mw)が15万~45万であるスチレン系樹脂からなることを特徴とする導光板。
(2)前記スチレン系樹脂が、50N荷重にて測定したビカット軟化温度が100℃以上である請求項1に記載の導光板。
(3)前記スチレン系樹脂が、スチレン系樹脂中の残存スチレンモノマー及び残存重合溶媒の総量が500μg/g以下であり、かつスチレンダイマーとトリマーの合計量が5000μg/g以下である、上記(1)または(2)に記載の導光板。
(4)前記スチレン系樹脂が、4-t-ブチルカテコール濃度が10μg/g未満であるスチレン系単量体を重合して得られる樹脂である、上記(1)~(3)のいずれかに記載の導光板。
(5)前記スチレン系樹脂が、メタノール可溶分が1.0質量%以下であり、かつ重量平均分子量(Mw)が20万~40万である、上記(1)~(4)のいずれかに記載の導光板。
(6)前記スチレン系樹脂が、50N荷重にて測定したビカット軟化温度が103℃以上である、上記(1)~(5)のいずれかに記載の導光板。
(7)前記スチレン系樹脂が、曲げ強度が90MPa以上である、上記(1)~(6)のいずれかに記載の導光板。
(8)前記スチレン系樹脂が、全光線透過率が90%以上である、上記(1)~(7)のいずれかに記載の導光板。
(9)前記スチレン系樹脂が、ヘーズが0.5%未満である、上記(1)~(8)のいずれかに記載の導光板。
(10)前記スチレン系樹脂が、YIが0.3以下である、上記(1)~(9)のいずれかに記載の導光板。
スチレン系樹脂は、スチレン系単量体を重合して得ることができる。スチレン系単量体とは、芳香族ビニル系モノマーである、スチレン、α-メチルスチレン、o-メチルスチレン、p-メチルスチレン等の単独または2種以上の混合物であり、好ましくはスチレンである。
重合工程を出た重合体を含む重合溶液は、脱揮工程に移送され、未反応の単量体及び重合溶媒が除去される。脱揮工程は加熱器付きの真空脱揮槽やベント付き脱揮押出機などで構成される。脱揮工程を出た溶融状態の重合体は造粒工程へ移送される。造粒工程では、多孔ダイよりストランド状に溶融樹脂を押出し、コールドカット方式や空中ホットカット方式、水中ホットカット方式にてペレット形状に加工される。
メタノール可溶分は、重合過程で副生成するスチレンオリゴマー(スチレンダイマー、スチレントリマー)の発生量の抑制、ホワイトオイル等の各種添加剤の添加量調整、残存スチレンモノマー及び残存重合溶媒の量を抑えることにより低減することができる。
メタノール可溶分(質量%)=((P-N)/P)×100
GPC機種:昭和電工社製Shodex GPC-101
カラム:ポリマーラボラトリーズ社製 PLgel 10μm MIXED-B
移動相:テトラヒドロフラン
試料濃度:0.2質量%
温度:オーブン40℃、注入口35℃、検出器35℃
検出器:示差屈折計
本発明における分子量は単分散ポリスチレンの溶出曲線より各溶出時間における分子量を算出し、ポリスチレン換算の分子量として算出したものである。
ビカット軟化温度は、JIS K 7206に準拠し、昇温速度50℃/hr、試験荷重50Nで測定を行った。
また、残存単量体及び残存重合溶媒は揮発性が高いため、例えば押出成形にて導光板を押出する際、ダイス出口で揮発してダイスに凝縮し、目ヤニの原因となることがある。目ヤニが押出した導光板に付着すると外観不良となる。また、射出成形の場合でも、射出成形時にガスが発生し、成形不良の原因となることがある。
キャピラリーガスクロマトグラフ:GC-4000(ジーエルサイエンス社製)
カラム:ジーエスサイエンス社製 InertCap WAX、内径 0.25mm、長さ 30m、膜厚 50μm
インジェクション温度:180℃
カラム温度:60℃~170℃
ディテクター温度:210℃
スプリット比:5/1
(イ)カラム:DB-1(ht) 0.25mm×30m 膜厚0.1μm
(ロ)インジェクション温度:250℃
(ハ)カラム温度:100-300℃
(二)検出器温度:300℃
(ホ)スプリット比:50/1
(へ)内部標準物質:n-エイコサン
透明性の観点から、スチレン系樹脂の全光線透過率は90%以上が好ましく、スチレン系樹脂のヘーズは1.0%以下が好ましく、より好ましくは0.5%未満である。
市販のスチレンには重合禁止剤として10~30μg/gのTBCが含まれる。TBC濃度が12μg/gの市販スチレン100重量部に活性アルミナ1質量部を添加、混合してTBCを吸着し、ろ紙で活性アルミナを除去して、TBC濃度が検出下限(1μg/g)未満のスチレンを得た。重合工程に供給されるスチレン中のTBC濃度は、スチレンにTBCを添加して調整した。
完全混合型撹拌槽である第1反応器と第2反応器及び静的混合器付プラグフロー型反応器である第3反応器を直列に接続して重合工程を構成した。各反応器の容量は、第1反応器を39リットル、第2反応器を39リットル、第3反応器を16リットルとした。表1に記載の原料組成にて、原料溶液を調製した。
該原料溶液を第1反応器に対して表1に記載の流量にて連続的に供給した。重合開始剤は、第1反応器の入口で表1に記載の添加濃度(原料スチレンに対する質量基準の濃度)となるように原料溶液に添加混合した。表1に記載の重合開始剤はそれぞれ次の通りである。また、ホワイトオイルはエクソンモービル社製クリストールN352を使用し、第3反応器の出口に供給した。
重合開始剤-1 :2,2-ビス(4,4-t-ブチルパーオキシシクロヘキシル)プロパン(日本油脂社製パーテトラAを使用した。)
重合開始剤-2 :1,1-ビス(t-ブチルパーオキシ)シクロヘキサン(日本油脂社製パーヘキサCを使用した。)
重合開始剤-3 :t-アミルパーオキシイソノナノエート(アルケマ吉富社製ルペロックス570を使用した。)
連鎖移動剤-1 :α-メチルスチレンダイマー(日本油脂社製ノフマーMSDを使用した。)
なお、第3反応器では、流れの方向に沿って温度勾配をつけ、中間部分、出口部分で表1の温度となるよう調整した。
続いて、第3反応器より連続的に取り出した重合体を含む溶液を直列に2段より構成される予熱器付き真空脱揮槽に導入し、表1に記載の樹脂温度となるよう予熱器の温度を調整した。また、表1に記載の圧力に調整することで、未反応のスチレン及びエチルベンゼンを分離した後、多孔ダイよりストランド状に押し出して、コールドカット方式にて、ストランドを冷却および切断しペレット化した。また、得られたペレットに外部潤滑剤として、エチレンビスステアリルアミドを100μg/gの濃度で添加しドライブレンドした。
表2に、各樹脂の特性を示す。
なお、2010年6月24日に出願された日本特許出願2010-143339号の明細書、特許請求の範囲、及び要約書の全内容をここに引用し、本発明の明細書の開示として、取り入れるものである。
Claims (10)
- メタノール可溶分が1.5質量%以下であり、かつ重量平均分子量(Mw)が15万~45万であるスチレン系樹脂からなることを特徴とする導光板。
- 前記スチレン系樹脂が、50N荷重にて測定したビカット軟化温度が100℃以上である請求項1に記載の導光板。
- 前記スチレン系樹脂が、スチレン系樹脂中の残存スチレンモノマー及び残存重合溶媒の総量が500μg/g以下であり、かつスチレンダイマーとトリマーの合計量が5000μg/g以下である、請求項1または2に記載の導光板。
- 前記スチレン系樹脂が、4-t-ブチルカテコール濃度が10μg/g未満であるスチレン系単量体を重合して得られる樹脂である、請求項1~3のいずれかに記載の導光板。
- 前記スチレン系樹脂が、メタノール可溶分が1.0質量%以下であり、かつ重量平均分子量(Mw)が20万~40万である、請求項1~4のいずれかに記載の導光板。
- 前記スチレン系樹脂が、50N荷重にて測定したビカット軟化温度が103℃以上である、請求項1~5のいずれかに記載の導光板。
- 前記スチレン系樹脂が、曲げ強度が90MPa以上である、請求項1~6のいずれかに記載の導光板。
- 前記スチレン系樹脂が、全光線透過率が90%以上である、請求項1~7のいずれかに記載の導光板。
- 前記スチレン系樹脂が、ヘーズが0.5%未満である、請求項1~8のいずれかに記載の導光板。
- 前記スチレン系樹脂が、YI(黄色度)が0.3以下である、請求項1~9のいずれかに記載の導光板。
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KR1020127033077A KR20130112716A (ko) | 2010-06-24 | 2011-06-22 | 스티렌계 도광판 |
CN201180030542.8A CN102959313B (zh) | 2010-06-24 | 2011-06-22 | 苯乙烯系导光板 |
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JP2014001295A (ja) * | 2012-06-18 | 2014-01-09 | Ps Japan Corp | ポリスチレン系樹脂組成物及び導光板 |
JP2017222770A (ja) * | 2016-06-14 | 2017-12-21 | 東洋スチレン株式会社 | スチレン系樹脂 |
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JP2009283384A (ja) * | 2008-05-26 | 2009-12-03 | Panasonic Corp | 積層型導光板、積層型拡散板、エッジライト型バックライト装置、直下型バックライト装置および液晶表示装置 |
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JPWO2011162306A1 (ja) | 2013-08-22 |
KR20190102083A (ko) | 2019-09-02 |
TW201206957A (en) | 2012-02-16 |
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