JP2005324391A - Manufacturing method of light guide body made of methacrylic resin - Google Patents
Manufacturing method of light guide body made of methacrylic resin Download PDFInfo
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Abstract
Description
本発明は、メタクリル樹脂製導光体の製造方法に関する。 The present invention relates to a method for producing a methacrylic resin light guide.
メタクリル樹脂は透明性に優れていることから、例えば図１に示すカラー液晶ディスプレイをはじめとするフラットパネルディスプレイ(4)の背面側に配置されるバックライト(2)に組み込まれる、板状のメタクリル樹脂製導光体(1)として広く用いられている。図１に示すバックライト(2)は、板状の導光体(1)の端面(1a)に光源(3)が配置された、いわゆるエッジライト型バックライトである。 Since the methacrylic resin is excellent in transparency, for example, a plate-like methacrylic compound incorporated in a backlight (2) disposed on the back side of a flat panel display (4) including the color liquid crystal display shown in FIG. Widely used as a resinous light guide (1). The backlight (2) shown in FIG. 1 is a so-called edge light type backlight in which a light source (3) is disposed on an end surface (1a) of a plate-like light guide (1).
ところで、かかるメタクリル樹脂製導光体を製造する方法としては、メタクリル樹脂を加熱溶融状態で成形する方法が一般的であるが、メタクリル樹脂は加熱溶融により熱分解を起こし易い。
アクリル樹脂の熱分解を引き起こすことなく、加熱溶融状態で成形する方法として、特許文献１〔特開平７−１６６０２０号公報の段落番号００１７〕などには、ジ−ｔｅｒｔ−ドデシルジスルフィドを配合したメタクリル樹脂組成物を用いる方法が開示されているが、この方法で導光体を製造したのでは、加熱溶融に伴う熱分解は防止できるものの、成形後の導光体に僅かではあるが着色を生ずるという問題があることがわかった。導光体に着色があると、たとえそれが僅かであっても、特に大画面用のエッジライト型バックライトでは光路長が長くなるので、その影響は大きくなる。 As a method of molding in a heated and melted state without causing thermal decomposition of the acrylic resin, Patent Document 1 (paragraph number 0017 of JP-A-7-166020) discloses a methacrylic resin blended with di-tert-dodecyl disulfide. Although a method using a composition is disclosed, a light guide produced by this method can prevent thermal decomposition due to heating and melting, but produces a slight coloration on a light guide after molding. I found out there was a problem. When the light guide is colored, even if it is slight, the influence of the edge light type backlight for large screens becomes large because the optical path length becomes long.
そこで本発明者は、熱分解や着色を招くことなくメタクリル樹脂製導光体を製造し得る方法を開発するべく鋭意検討した結果、ジ−ｔｅｒｔ−ブチルジスルフィドを配合することにより、メタクリル樹脂の熱分解が防止できるばかりか、着色の少ない導光体が得られることを見出し、本発明に至った。 Therefore, as a result of intensive studies to develop a method capable of producing a light guide made of methacrylic resin without causing thermal decomposition or coloring, the inventor of the present invention, by adding di-tert-butyl disulfide, The inventors have found that a light guide body that can be prevented from being decomposed and that is less colored can be obtained.
すなわち本発明は、メタクリル樹脂にジ−ｔｅｒｔ−ブチルジスルフィドが配合されたメタクリル樹脂組成物を加熱溶融状態で成形することを特徴とするメタクリル樹脂製導光体の製造方法を提供するものである。 That is, this invention provides the manufacturing method of the methacrylic resin light guide characterized by shape | molding the methacrylic resin composition by which di-tert- butyl disulfide was mix | blended with the methacrylic resin in the heat-melting state.
本発明の製造方法によれば、成形時にメタクリル樹脂の熱分解や着色を招くことなくメタクリル樹脂製導光体を製造することができる。 According to the production method of the present invention, a methacrylic resin light guide can be produced without causing thermal decomposition or coloring of the methacrylic resin during molding.
本発明の製造方法に用いられるメタクリル樹脂は、メタクリル酸メチルを主成分とする単量体、具体的にはメタクリル酸メチル５０質量％以上を含む単量体を重合させて得られる重合体であって、メタクリル酸メチル単独を重合させて得られるポリメタクリル酸メチルであってもよいし、メタクリル酸メチル５０質量％以上およびこれと共重合可能な単量体５０質量％以下との共重合体であってもよい。メタクリル酸メチルと共重合可能な単量体としては、例えばメタクリル酸エチル、メタクリル酸プロピル、メタクリル酸ブチル、メタクリル酸ベンジル、アクリル酸２−エチルヘキシル、メタクリル酸シクロヘキシル、メタクリル酸ボルニル、メタクリル酸アダマンチル、メタクリル酸シクロペンタジエニルなどのメタクリル酸エステル類、
アクリル酸メチル、アクリル酸エチル、アクリル酸プロピル、アクリル酸ブチル、アクリル酸ベンジル、アクリル酸２−エチルヘキシル、アクリル酸シクロヘキシル、アクリル酸ボルニル、アクリル酸アダマンチル、アクリル酸シクロペンタジエニルなどのアクリル酸エステル類、
アクリル酸、メタクリル酸、マレイン酸、イタコン酸、無水マレイン酸、無水イタコン酸などの不飽和カルボン酸およびその酸無水物、アクリル酸２−ヒドロキシエチル、アクリル酸２−ヒドロキシプロピル、アクリル酸２−ヒドロキシプロピル、アクリル酸モノグリセロール、メタクリル酸２−ヒドロキシエチル、メタクリル酸２−ヒドロキシプロピル、メタクリル酸モノグリセロールなどのヒドロキシル基含有単量体、アクリルアミド、メタクリルアミド、アクリロニトリル、メタクリロニトリル、ジアセトンアクリルアミド、メタクリル酸ジメチルアミノエチルなどの窒素含有単量体、アリルグリシジルエーテル、アクリル酸グリシジル、メタクリル酸グリシジルなどのエポキシ基含有単量体、スチレン、α−メチルスチレンなどのスチレン系単量体などが挙げられる。
The methacrylic resin used in the production method of the present invention is a polymer obtained by polymerizing a monomer containing methyl methacrylate as a main component, specifically, a monomer containing 50% by mass or more of methyl methacrylate. Polymethyl methacrylate obtained by polymerizing methyl methacrylate alone, or a copolymer of 50% by mass or more of methyl methacrylate and 50% by mass or less of a monomer copolymerizable therewith. There may be. Examples of the monomer copolymerizable with methyl methacrylate include ethyl methacrylate, propyl methacrylate, butyl methacrylate, benzyl methacrylate, 2-ethylhexyl acrylate, cyclohexyl methacrylate, bornyl methacrylate, adamantyl methacrylate, and methacrylic acid. Methacrylate esters such as cyclopentadienyl acid,
Acrylic esters such as methyl acrylate, ethyl acrylate, propyl acrylate, butyl acrylate, benzyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, bornyl acrylate, adamantyl acrylate, and cyclopentadienyl acrylate ,
Unsaturated carboxylic acids such as acrylic acid, methacrylic acid, maleic acid, itaconic acid, maleic anhydride, itaconic anhydride and their anhydrides, 2-hydroxyethyl acrylate, 2-hydroxypropyl acrylate, 2-hydroxy acrylate Hydroxyl group-containing monomers such as propyl, monoglycerol acrylate, 2-hydroxyethyl methacrylate, 2-hydroxypropyl methacrylate, monoglycerol methacrylate, acrylamide, methacrylamide, acrylonitrile, methacrylonitrile, diacetone acrylamide, methacryl Nitrogen-containing monomers such as dimethylaminoethyl acid, epoxy group-containing monomers such as allyl glycidyl ether, glycidyl acrylate, and glycidyl methacrylate, and styrene and α-methylstyrene. Such as alkylene monomer and the like.
メタクリル樹脂に配合されるジ−ｔｅｒｔ−ブチルジスルフィドの配合量は、メタクリル樹脂に対して通常、０．１ｐｐｍ〜２０００ｐｐｍ、好ましくは１０ｐｐｍ〜１０００ｐｐｍである。 The blending amount of di-tert-butyl disulfide blended in the methacrylic resin is usually 0.1 ppm to 2000 ppm, preferably 10 ppm to 1000 ppm relative to the methacrylic resin.
このようなメタクリル樹脂組成物は、例えばメタクリル酸メチルを主成分とする単量体またはその部分重合物にジ−ｔｅｒｔ−ブチルジスルフィドを配合し、重合する方法により製造することができる。重合方法は、例えば塊状重合法（バルク重合法）、溶液重合法、乳化重合法、懸濁重合法など通常の重合方法が挙げられ、安定剤、乳化剤などのような重合のための添加剤を使用することなく容易に重合させることができ、不純物が少なく、優れた透明性の導光体が容易に得られる点で、塊状重合、溶液重合法が好ましい。 Such a methacrylic resin composition can be produced, for example, by a method in which di-tert-butyl disulfide is blended with a monomer mainly composed of methyl methacrylate or a partial polymer thereof and polymerized. Examples of the polymerization method include usual polymerization methods such as bulk polymerization method (bulk polymerization method), solution polymerization method, emulsion polymerization method and suspension polymerization method, and additives for polymerization such as stabilizers and emulsifiers are added. Bulk polymerization and solution polymerization are preferred in that they can be easily polymerized without using them, and there are few impurities, and an excellent transparent light guide can be easily obtained.
塊状重合法や溶液重合法によりメタクリル樹脂組成物を得るには、具体的には、例えばメタクリル酸メチルを主成分とする単量体にジ−ｔｅｒｔ−ブチルジスルフィドおよび重合開始剤を加え、塊状重合または溶液重合して、重合体含有量４０質量％〜７０質量％の部分重合物とし、この部分重合物から未重合の単量体を脱揮して重合体を得ればよい。また、単量体を重合した後の部分重合物にジ−ｔｅｒｔ−ブチルジスルフィドを加え、脱揮してもよい。さらに脱揮後の重合体にジ−ｔｅｒｔ−ブチルジスルフィドを加えてもよい。塊状重合法や溶液重合法に用いる単量体には連鎖移動剤、離型剤などを予め添加してもよい。 In order to obtain a methacrylic resin composition by a bulk polymerization method or a solution polymerization method, specifically, for example, a bulk polymerization is performed by adding di-tert-butyl disulfide and a polymerization initiator to a monomer mainly composed of methyl methacrylate. Alternatively, solution polymerization may be performed to obtain a partial polymer having a polymer content of 40% by mass to 70% by mass, and an unpolymerized monomer may be devolatilized from the partial polymer to obtain a polymer. In addition, di-tert-butyl disulfide may be added to the partially polymerized product after the monomer is polymerized and devolatilized. Further, di-tert-butyl disulfide may be added to the polymer after devolatilization. You may add a chain transfer agent, a mold release agent, etc. previously to the monomer used for the block polymerization method or the solution polymerization method.
また、乳化重合法、懸濁重合法などの方法で得られた粉末状またはペレット状のメタクリル樹脂やその粉砕物に、ジ−ｔｅｒｔ−ブチルジスルフィドを加えてヘンシェルミキサー、Ｖ型ブレンダーなどの混合機により混合したり、一軸混練機、二軸混練機などの混練機により溶融混練してもよい。混合機による混合や、混練機による溶融混練は、例えば窒素ガス、アルゴンガスなどの不活性ガスの雰囲気下で行われることが好ましい。 Further, a mixer such as a Henschel mixer or a V-type blender is prepared by adding di-tert-butyl disulfide to a powdered or pelleted methacrylic resin obtained by a method such as an emulsion polymerization method or a suspension polymerization method or a pulverized product thereof. Or may be melt kneaded by a kneader such as a uniaxial kneader or a biaxial kneader. Mixing with a mixer or melt-kneading with a kneader is preferably performed in an atmosphere of an inert gas such as nitrogen gas or argon gas.
かくしてメタクリル樹脂にジ−ｔｅｒｔ−ブチルジスルフィドが配合されてなる組成物が得られるが、かかる組成物はメタクリル樹脂製導光体を製造するための導光体用メタクリル樹脂組成物として好適である。 Thus, a composition in which di-tert-butyl disulfide is blended with a methacrylic resin can be obtained. Such a composition is suitable as a methacrylic resin composition for a light guide for producing a light guide made of methacrylic resin.
メタクリル樹脂組成物を加熱溶融状態で成形する方法としては、例えばメタクリル樹脂組成物を混練機により加熱し溶融混練したのち、成形機にて成形すればよい。成形方法としては、成形機として射出成形機を用い、成形型内に射出して成形する射出成形法、成形機として押出成形機を用い、ダイから押し出して成形する押出成形法が挙げられる。メタクリル樹脂にジ−ｔｅｒｔ−ブチルジスルフィドを加えて混練機により溶融混練することによりメタクリル樹脂組成物を得る場合には、得られたメタクリル樹脂組成物を溶融状態のまま、成形機に送り成形してもよい。成形温度は通常２３０℃以上であるが、例えば２６０℃以上で成形することもでき、通常は２９０℃以下である。 As a method for molding the methacrylic resin composition in a heated and melted state, for example, the methacrylic resin composition may be heated and melt-kneaded with a kneader and then molded with a molding machine. Examples of the molding method include an injection molding method in which an injection molding machine is used as a molding machine and injection is performed in a molding die, and an extrusion molding method in which an extrusion molding machine is used as a molding machine to perform extrusion molding from a die. When obtaining a methacrylic resin composition by adding di-tert-butyl disulfide to a methacrylic resin and melt-kneading with a kneader, the resulting methacrylic resin composition is sent to a molding machine in a molten state and molded. Also good. Although the molding temperature is usually 230 ° C. or higher, for example, the molding can be performed at 260 ° C. or higher, and is usually 290 ° C. or lower.
本発明の製造方法は、射出成形法により成形する場合に好ましく適用され、さらに好ましくは、成形サイクルが長くなって押出機内および射出成形機内における滞留時間が長くなる比較的大きな画面用の導光板、具体的には対角線で１０ｃｍ以上の画面サイズに適用される導光板を射出成形法により成形する場合に好適である。 The production method of the present invention is preferably applied in the case of molding by an injection molding method, and more preferably, a relatively large light guide plate for a screen with a long molding cycle and a long residence time in the extruder and the injection molding machine, Specifically, it is suitable when a light guide plate that is applied to a screen size of 10 cm or more diagonally is formed by an injection molding method.
かくして得られるメタクリル樹脂製導光体(1)は着色がないので、図１に示すようなカラーフラットパネルディスプレイ装置(4)の背面に配置されるバックライト装置(2)に組み込まれる導光体(1)として好ましく用いられ、特に画面サイズが対角線で１０ｃｍ以上、好ましくは１５ｃｍ以上、さらに好ましくは２０ｃｍ以上の比較的大きな画面用で、エッジライト型バックライト装置(2)用の導光体(1)として好適である。 Since the methacrylic resin light guide (1) thus obtained is not colored, the light guide incorporated in the backlight device (2) disposed on the back of the color flat panel display device (4) as shown in FIG. It is preferably used as (1), and particularly for a relatively large screen having a screen size of 10 cm or more, preferably 15 cm or more, more preferably 20 cm or more on a diagonal line, and a light guide for an edge-light type backlight device (2) ( Suitable as 1).
以下、実施例によって本発明の製造方法をより詳細に説明するが、本発明はこれら実施例によって限定されるものではない。 EXAMPLES Hereinafter, although the Example demonstrates the manufacturing method of this invention in detail, this invention is not limited by these Examples.
なお、各実施例における評価は以下の方法で行った。
(1)熱安定性
ＴＧ−ＤＴＡ装置〔「ＴＧ／ＤＴＡ６３００」、セイコーインスツルメンツ社製〕を用いて昇温速度２℃／分で５０℃から４３０℃までペレットを昇温しながら重量損失を測定し、ペレットの重量が２％減少したときの温度を読み取った。この温度が高いほど熱安定性に優れ、熱分解しにくいことを示す。
(2)単量体含有量
各実施例で得たペレットおよび成形体からそれぞれ０．１ｇの試験片を採取し、２０ｃｍ3のジクロロメタンに溶解して溶液とし、ガスクロマトグラフ装置〔「ＧＣ−１４Ｂ型」、島津製作所製〕を用いて単量体含有量（質量％）を測定した。
(3)成形着色性
各実施例で得た試験片の端面を研磨機〔「プラビューティー ＰＢ−１００」、旭メガロ社製〕で研磨してから、分光光度計〔「Ｕ−４０００」、日立製作所製〕にて波長３８０〜７８０ｎｍの範囲で１５０ｍｍパス透過率を測定し、得られた透過率からＪＩＳ Ｚ−８７２２記載の方法に従ってＸＹＺ値を求め、ＪＩＳ Ｋ−７１０５記載の方法に従って黄色度を求めた。２個の試験片について求めた黄色度の平均値（ＹＩavr）を成形着色性とした。黄色度の平均値（ＹＩavr）が小さいほど、成形時の着色が少ないことを示す。
In addition, evaluation in each Example was performed with the following method.
(1) Using a heat-stable TG-DTA device (“TG / DTA6300”, manufactured by Seiko Instruments Inc.), the weight loss was measured while raising the pellet from 50 ° C. to 430 ° C. at a rate of temperature rise of 2 ° C./min. The temperature when the weight of the pellet decreased by 2% was read. The higher this temperature is, the better the thermal stability and the harder it is to decompose.
(2) Monomer content 0.1 g of a test piece was taken from each of the pellets and molded bodies obtained in each Example, dissolved in 20 cm 3 of dichloromethane to form a solution, and a gas chromatograph [“GC-14B type” ”, Manufactured by Shimadzu Corporation], and the monomer content (mass%) was measured.
(3) Molding colorability The end face of the test piece obtained in each example was polished with a polishing machine ["Pura Beauty PB-100" manufactured by Asahi Megaro Co., Ltd.], and then a spectrophotometer ["U-4000", Hitachi Manufactured by Seisakusho Co., Ltd.], measuring the 150 mm path transmittance in the wavelength range of 380 to 780 nm, obtaining the XYZ value from the obtained transmittance according to the method described in JIS Z-8722, and determining the yellowness according to the method described in JIS K-7105. Asked. The average value of yellowness (YI avr ) obtained for two test pieces was defined as molding colorability. It shows that there is little coloring at the time of shaping | molding, so that the average value ( YIavr ) of yellowness is small.
実施例１
メタクリル酸メチル９８．９質量部およびアクリル酸メチル０．８質量部を混合し、ジ−ｔｅｒｔ−ブチルジスルフィド０．０２質量部、連鎖移動剤〔オクチルメルカプタン〕０．１７質量部および離型剤〔ステアリルアルコール〕０．１質量部を加えて単量体混合液を得た。また、メタクリル酸メチル１００質量部に重合開始剤〔１，１−ジ（ｔ−ブチルパーオキシ）３，３，５−トリメチルシクロヘキサン〕０．０３６質量部を加えて開始剤混合液を得た。単量体混合液と開始剤混合液とを流量比が８．８：１になるように完全混合型重合反応器へ連続して供給し、平均滞留時間２０分、温度１７５℃で平均重合率５４％まで重合して部分重合物を得た。得られた部分重合物を２００℃に加熱してベント付き脱揮押出機へ導き、２４０℃で未反応の単量体をベントから脱揮すると共に、脱揮後の重合体は溶融状態で押出し、水冷後、裁断してペレットとした。このペレットの熱安定性および単量体含有量を第１表に示す。
Example 1
98.9 parts by mass of methyl methacrylate and 0.8 part by mass of methyl acrylate were mixed, 0.02 part by mass of di-tert-butyl disulfide, 0.17 part by mass of a chain transfer agent [octyl mercaptan] and a release agent [ Stearyl alcohol] 0.1 parts by mass was added to obtain a monomer mixture. Further, 0.036 parts by mass of a polymerization initiator [1,1-di (t-butylperoxy) 3,3,5-trimethylcyclohexane] was added to 100 parts by mass of methyl methacrylate to obtain an initiator mixed solution. The monomer mixture and the initiator mixture are continuously fed to the fully mixed polymerization reactor so that the flow ratio is 8.8: 1, and the average polymerization rate is 20 minutes at an average residence time of 175 ° C. Polymerization to 54% gave a partially polymerized product. The resulting partially polymerized product is heated to 200 ° C. and led to a vented devolatilizing extruder, and unreacted monomers are devolatilized from the vent at 240 ° C., and the polymer after devolatilization is extruded in a molten state. After cooling with water, it was cut into pellets. The thermal stability and monomer content of this pellet are shown in Table 1.
上記で得たペレットを射出成形機〔「Ｍ−１４０ＳＪ型」、名機製作所製〕にて２８０℃および２９０℃にそれぞれ加熱して溶融し、成形サイクル１分の条件で型内に射出成形して、１５０×１５０×３ｍｍの平板に成形して導光体状の成形体を得た。この成形体の単量体含有量および成形着色性を第１表に示す。 The pellets obtained above were melted by heating to 280 ° C. and 290 ° C. in an injection molding machine (“M-140SJ type”, manufactured by Meiki Seisakusho), respectively, and injection molded into the mold under the conditions of a molding cycle of 1 minute. Then, it was molded into a flat plate of 150 × 150 × 3 mm to obtain a light guide-shaped molded body. Table 1 shows the monomer content and molding colorability of the molded product.
上記で得たペレットを射出成形機〔「ＩＳ１３０ＦII」、東芝機械社製〕を用いて、２４０℃および２８０℃にそれぞれ加熱して溶融し、１分の成形サイクルにて繰り返し成形型内に射出して、２００×１２０×３ｍｍの平板に成形して成形体とした。成形サイクル１１回目の成形体と１２回目の成形体についてそれぞれ成形着色性の評価と同様に操作して２００ｍｍパス透過率を求め、黄色度（ＹＩ）を求めたところ、その平均値は、それぞれＹＩ＝６（成形温度２４０℃）およびＹＩ＝８（成形温度２８０℃）であった。 Using the injection molding machine ["IS130FII" manufactured by Toshiba Machine Co., Ltd.], the pellets obtained above were melted by heating to 240 ° C and 280 ° C, respectively, and repeatedly injected into the mold in a molding cycle of 1 minute. And it shape | molded into the flat plate of 200x120x3 mm, and was set as the molded object. When the molded product of the 11th molding cycle and the molded product of the 12th molding cycle were operated in the same manner as in the evaluation of molding colorability, the 200 mm pass transmittance was determined and the yellowness (YI) was determined. = 6 (molding temperature 240 ° C.) and YI = 8 (molding temperature 280 ° C.).
比較例１
ジ−ｔｅｒｔ−ブチルジスルフィドに代えて、ジ−ｔｅｒｔ−ドデシルジスルフィド０．０１質量部を用いた以外は実施例１と同様に操作して、ペレットを得た。このペレットの熱安定性および単量体含有量を第１表に示す。
Comparative Example 1
A pellet was obtained in the same manner as in Example 1 except that 0.01 part by mass of di-tert-dodecyl disulfide was used instead of di-tert-butyl disulfide. The thermal stability and monomer content of this pellet are shown in Table 1.
実施例１で得たペレットに代えて上記で得たペレットを用いた以外は実施例１と同様に操作して、１５０×１５０×３ｍｍの成形体を得た。この成形体の単量体含有量および成形着色性を第１表に示す。 A 150 × 150 × 3 mm molded body was obtained in the same manner as in Example 1 except that the pellets obtained above were used instead of the pellets obtained in Example 1. Table 1 shows the monomer content and molding colorability of the molded product.
比較例２
ジ−ｔｅｒｔ−ブチルジスルフィドを用いなかった以外は実施例１と同様に操作して、ペレットを得た。このペレットの熱安定性および単量体含有量を第１表に示す。
Comparative Example 2
Pellets were obtained in the same manner as in Example 1 except that di-tert-butyl disulfide was not used. The thermal stability and monomer content of this pellet are shown in Table 1.
実施例１で得たペレットに代えて上記で得たペレットを用いた以外は実施例１と同様に操作して、１５０×１５０×３ｍｍの成形体を得た。この成形体の単量体含有量および成形着色性を第１表に示す。 A 150 × 150 × 3 mm molded body was obtained in the same manner as in Example 1 except that the pellets obtained above were used instead of the pellets obtained in Example 1. Table 1 shows the monomer content and molding colorability of the molded product.
第 １ 表
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
ペレット 成形体
熱安定性 単量体含有量 単量体含有量 成形着色性
（℃） （質量％） （質量％） （ＹＩavr）
２８０℃ ２９０℃ ２８０℃ ２９０℃
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
実施例１ ２９７ ０．２０ ０．６１ １．０１ ８．２ ８．６
比較例１ ２９７ ０．１８ ０．４６ ０．７３ １４．８ １７．１
比較例２ ２６９ ０．２３ １．５４ − ５．６ −
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Table 1
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Pellet compact
Thermal stability Monomer content Monomer content Molding colorability
(° C.) (mass%) (mass%) (YI avr )
280 ° C 290 ° C 280 ° C 290 ° C
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
Example 1 297 0.20 0.61 1.01 8.2 8.6
Comparative Example 1 297 0.18 0.46 0.73 14.8 17.1
Comparative Example 2 269 0.23 1.54-5.6-
━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
１：メタクリル樹脂製導光体 1a：端面
２：バックライト ３：光源
４：フラットパネルディスプレイ
1: Methacrylic resin
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