JPH1080940A - Injection molding method of moldings with fine uneven form and moldings with fine uneven form - Google Patents
Injection molding method of moldings with fine uneven form and moldings with fine uneven formInfo
- Publication number
- JPH1080940A JPH1080940A JP23828496A JP23828496A JPH1080940A JP H1080940 A JPH1080940 A JP H1080940A JP 23828496 A JP23828496 A JP 23828496A JP 23828496 A JP23828496 A JP 23828496A JP H1080940 A JPH1080940 A JP H1080940A
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- JP
- Japan
- Prior art keywords
- shape
- injection molding
- thermoplastic resin
- molding method
- fine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Injection Moulding Of Plastics Or The Like (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、各種熱可塑性樹脂
にて表面に微細な凹凸形状を施した板状成形品を射出成
形する方法及びその成形品に関する。特に、面照明装置
用導光板の製造に適した射出成形方法及びその成形品に
関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for injection-molding a plate-like molded product having fine irregularities on its surface with various thermoplastic resins, and a molded product thereof. In particular, the present invention relates to an injection molding method suitable for manufacturing a light guide plate for a surface illumination device and a molded product thereof.
【０００２】[0002]
【従来の技術】各種熱可塑性樹脂の射出成形に於いて
は、スクリュー等を利用して熱可塑性樹脂を加熱溶融
し、金型内へ充填後、冷却固化して任意の形状の成形品
を得る方法が一般に用いられている。このような射出成
形方法では、金型表面に溶融した熱可塑性樹脂が接触す
ると、その接触面で熱可塑性樹脂が急速に冷却され、熱
可塑性樹脂の流動性が著しく低下するため、金型表面に
施された微細な凹凸形状を成形品に転写させる場合、充
分な転写効果が得られない場合がある。2. Description of the Related Art In the injection molding of various thermoplastic resins, a thermoplastic resin is heated and melted using a screw or the like, filled into a mold, and then cooled and solidified to obtain a molded article of an arbitrary shape. The method is commonly used. In such an injection molding method, when the molten thermoplastic resin comes into contact with the mold surface, the thermoplastic resin is rapidly cooled at the contact surface, and the fluidity of the thermoplastic resin is significantly reduced. When transferring the applied fine irregularities to the molded product, a sufficient transfer effect may not be obtained.
【０００３】従来、表面に微細な凹凸形状を有する成形
品の射出成形に於いては、通常は射出圧力や保圧を高く
する、流動性の高い熱可塑性樹脂材料を用いる、金型温
度を高くする等の方法が用いられる。Conventionally, in the injection molding of a molded article having fine irregularities on the surface, usually, the injection pressure and the holding pressure are increased, a thermoplastic resin material having high fluidity is used, and the mold temperature is increased. And other methods are used.
【０００４】[0004]
【発明が解決しようとする課題】射出圧力や保圧を高め
ていくと、溶融した熱可塑性樹脂を充填する時の流動抵
抗、及び冷却時の固化速度の不均一性が大きくなり、金
型内部に生じる圧力分布によって成形品中の残留応力が
増加し、成形品の変形あるいは反り等が発生する。ま
た、凹凸形状が微細になると、射出圧力や保圧のみを高
めただけでは転写効果が不足し、溶融した熱可塑性樹脂
を固化する前に微細な凹凸部に入り込ませて付形するた
めに、更に射出速度を大きくする必要がある。但し、射
出速度を大きくすると、溶融した熱可塑性樹脂のせん断
発熱によるシルバーストリークス、金型表面と溶融した
熱可塑性樹脂との摩擦抵抗によるジェッティングやフロ
ーマーク等の外観不良が発生する。As the injection pressure and the holding pressure are increased, the flow resistance at the time of filling the molten thermoplastic resin and the non-uniformity of the solidification rate at the time of cooling are increased, and the inside of the mold is increased. The residual stress in the molded article increases due to the pressure distribution generated in the molded article, and the molded article is deformed or warped. In addition, when the uneven shape becomes fine, the transfer effect is insufficient only by increasing the injection pressure and the holding pressure, and the molten thermoplastic resin is formed by entering the fine uneven portion before solidifying, Further, it is necessary to increase the injection speed. However, when the injection speed is increased, appearance defects such as silver streaks due to shear heating of the molten thermoplastic resin, jetting and flow marks due to frictional resistance between the mold surface and the molten thermoplastic resin occur.
【０００５】流動性の高い熱可塑性樹脂を用いる場合、
通常は分子量を低下させて流動性を高める方法が採用さ
れ、微細な形状を転写させる効果は得られるが、成形品
の機械的強度が低下し、高温高湿下や溶剤に接触する環
境下でクラック、クレージング等が発生するといった問
題が生じる。When a thermoplastic resin having a high fluidity is used,
Usually, a method of increasing the fluidity by reducing the molecular weight is adopted, and the effect of transferring a fine shape can be obtained, but the mechanical strength of the molded product is reduced, and the product is exposed to high temperature, high humidity, or an environment that comes into contact with a solvent. Problems such as cracking and crazing occur.
【０００６】金型温度を高くすることは、表面に微細凹
凸形状を転写させる有効な手段であるが、金型の表面を
ＪＩＳ・Ｋ７２０７法で規定された熱可塑性樹脂の荷重
たわみ温度以上に保持したまま成形品を金型から離型し
取り出すことは不可能である。成形品を金型から離型し
取り出すためには、使用する熱可塑性樹脂の荷重たわみ
温度より低い温度まで冷却固化する必要があり、更に生
産性を向上させるために結露寸前の温度まで金型温度を
冷却する手法が用いられている。しかし、射出成形に用
いる金型は、重量、容量ともに成形品形状よりも何倍も
大きい鋼鉄製のものが一般的であり、熱媒及び冷媒を交
互に循環させて加熱、冷却を繰り返すためには多くの熱
量と時間を必要とし、工業的に安定に生産するには困難
である。Increasing the mold temperature is an effective means for transferring the fine irregularities onto the surface, but the mold surface is kept at a temperature equal to or higher than the load deflection temperature of the thermoplastic resin specified by JIS K7207. It is impossible to release the molded product from the mold while removing it. In order to release and remove the molded product from the mold, it is necessary to cool and solidify it to a temperature lower than the deflection temperature of the thermoplastic resin to be used. The technique of cooling is used. However, the mold used for injection molding is generally made of steel whose weight and capacity are many times larger than the shape of the molded product.In order to repeat heating and cooling by alternately circulating a heat medium and a refrigerant, Requires a large amount of heat and time, and is difficult to produce industrially stably.
【０００７】本発明の目的は、熱可塑性樹脂を用いて微
細な凹凸形状を有する成形品を、熱可塑性樹脂が本来持
つ物性を低下させず、外観不良や変形等を伴わずに工業
的に安定して生産できる方法、及びその方法により得ら
れる成形品を提供することにある。It is an object of the present invention to provide a molded article having a fine unevenness using a thermoplastic resin without deteriorating the physical properties inherent to the thermoplastic resin, and without industrial defects such as poor appearance and deformation. And a molded article obtained by the method.
【０００８】[0008]
【課題を解決するための手段】本発明者らは、上記課題
を解決するため鋭意検討した結果、高周波誘導加熱の原
理を利用することにより、金型の表面部分のみを選択的
に熱可塑性樹脂の軟化温度以上に加熱することができ、
しかも成形品を金型から離型して取り出す時には荷重た
わみ温度より低い温度に急冷することが可能となること
を見出し、本発明を完成した。Means for Solving the Problems The inventors of the present invention have conducted intensive studies to solve the above-mentioned problems, and as a result, by utilizing the principle of high-frequency induction heating, only the surface of the mold has been selectively treated with a thermoplastic resin. Above the softening temperature of
In addition, the present inventors have found that it is possible to rapidly cool the molded product to a temperature lower than the deflection temperature under load when releasing the molded product from the mold, and thus completed the present invention.
【０００９】即ち本発明は、熱可塑性樹脂を用いて、少
なくとも一方の面に微細な凹凸形状が付与された板状成
形品を射出成形する方法に於いて、該凹凸形状を転写さ
せる金型表面を予め該熱可塑性樹脂の軟化温度以上に高
周波誘導加熱して射出成形する微細な凹凸形状付成形品
の射出成形方法である。That is, the present invention relates to a method of injection-molding a plate-like molded product having a fine irregular shape on at least one surface using a thermoplastic resin. Is a high-frequency induction heating at a temperature higher than or equal to the softening temperature of the thermoplastic resin in advance, and injection molding is performed.
【００１０】本発明に於いては、上記の微細な凹凸形状
がプリズム形状を構成単位として配列されて成り、かつ
プリズム形状の高さａと配列ピッチｂとの比ｂ／ａが
０．２〜５００であることが好ましく適用される。In the present invention, the fine irregularities described above are arranged with the prism shape as a constituent unit, and the ratio b / a of the height a of the prism shape to the arrangement pitch b is 0.2 to 0.2. Preferably, it is 500.
【００１１】本発明に於いては、上記の微細な凹凸形状
が立方体状、直方体状、円筒状、楕円筒状の何れかの形
状を構成単位として配列されて成り、かつ構成単位の形
状の高さａと配列ピッチｂとの比ｂ／ａが２〜５０であ
ることも好ましく適用される。In the present invention, the above-mentioned fine unevenness is formed by arranging any one of a cubic shape, a rectangular parallelepiped shape, a cylindrical shape, and an elliptic cylindrical shape as a constitutional unit, and the height of the constitutional unit is high. It is also preferably applied that the ratio b / a between the height a and the arrangement pitch b is 2 to 50.
【００１２】また、本発明に於いては、上記の微細な凹
凸形状面が梨地状で、ＪＩＳ・Ｂ０６０１−１９９４法
により測定した該凹凸形状面の表面粗さの最大高さ（Ｒ
ｙ）が１〜１００μｍとなることも好ましく適用され
る。Further, in the present invention, the above-mentioned fine uneven surface has a matte surface, and the maximum height (R) of the surface roughness of the uneven surface measured by JIS B0601-1994 method.
It is also preferably applied that y) is 1 to 100 μm.
【００１３】更に、本発明に於いては、上記の微細な凹
凸形状が球面状または非球面状の形状を構成単位として
配列されて成り、かつ形状の高さａとピッチｂとの比ｂ
／ａが０．２〜５００であることも好ましく適用され
る。Further, according to the present invention, the above-mentioned fine irregularities are arranged by using a spherical or aspherical shape as a constituent unit, and a ratio b between the height a of the shape and the pitch b.
It is also preferably applied that / a is from 0.2 to 500.
【００１４】本発明に於いては、熱可塑性樹脂としてメ
タクリル樹脂またはポリカーボネイト樹脂が好ましく適
用される。In the present invention, a methacrylic resin or a polycarbonate resin is preferably used as the thermoplastic resin.
【００１５】一方、本発明は、上記射出成形方法により
得られる板状成形品、特に面照明光源用導光板を提供す
るものでもある。On the other hand, the present invention also provides a plate-like molded product obtained by the above-mentioned injection molding method, in particular, a light guide plate for a surface illumination light source.
【００１６】[0016]
【発明の実施の形態】本発明に用いられる金型表面の加
熱方法は、高周波誘導加熱である。高周波誘導加熱によ
ると、金型表面の表層部分のみを選択的に短時間で加熱
することができ、金型全体の熱膨張、収縮等による変形
がなく、成形品の寸法精度も向上させることができる。
以下、図面を用いて説明する。BEST MODE FOR CARRYING OUT THE INVENTION The method of heating a mold surface used in the present invention is high-frequency induction heating. According to the high-frequency induction heating, only the surface layer of the mold surface can be selectively heated in a short time, there is no deformation due to thermal expansion, shrinkage, etc. of the entire mold, and the dimensional accuracy of the molded product can be improved. it can.
This will be described below with reference to the drawings.
【００１７】図１に示すように、金型の固定側１１と移
動側１２の中間に高周波誘導加熱のインダクター１３を
設置し高周波を発振させると、例えば図２に示すように
金型表面（図１のＡ点）のみ急激に温度が上昇し、金型
内部（図１のＢ点）は高周波誘導加熱により殆ど温度が
上昇しないことが確認できる。図２の場合、金型は冷却
水により冷却しておらず、単純に高周波誘導加熱による
金型の温度分布の経時変化の例を示すものである。即
ち、高周波誘導加熱により金型表面付近を選択的に加熱
すれば、金型表面付近のみを急加熱急冷却できるので、
射出成形サイクルをさほど延長することがない。As shown in FIG. 1, when a high frequency induction heating inductor 13 is installed between the fixed side 11 and the movable side 12 of the mold to oscillate high frequency, for example, as shown in FIG. It can be confirmed that the temperature rises sharply only at point A (point 1), and the temperature inside the mold (point B in FIG. 1) hardly rises due to high-frequency induction heating. In the case of FIG. 2, the mold is not cooled by the cooling water, and simply shows an example of a temporal change in the temperature distribution of the mold due to high-frequency induction heating. That is, if the vicinity of the mold surface is selectively heated by high-frequency induction heating, only the vicinity of the mold surface can be rapidly heated and rapidly cooled.
Does not significantly extend the injection molding cycle.
【００１８】本発明に用いられる金型の材質は、高周波
により誘導加熱現象を生じさせる必要上、磁性材料が用
いられる。As the material of the mold used in the present invention, a magnetic material is used because it is necessary to cause an induction heating phenomenon by high frequency.
【００１９】本発明に用いられる高周波誘導加熱方法に
於ける周波数は、金型表面の加熱される部分の厚みを制
御しやすい点で、１ＫＨｚ〜１ＭＨｚの範囲が特に好ま
しい。The frequency in the high-frequency induction heating method used in the present invention is particularly preferably in the range of 1 KHz to 1 MHz in that the thickness of the heated portion of the mold surface can be easily controlled.
【００２０】本発明に於ける軟化温度とは、ＪＩＳ・Ｋ
７２０７のＢ法（試験片に加える曲げ応力４．６ｋｇｆ
／ｃｍ2 ）に規定された方法で測定した熱可塑性樹脂の
荷重たわみ温度より１０度低い温度として定義する。本
発明では、金型表面の温度をこのように定義した軟化温
度以上にする必要がある。また、軟化温度は使用する熱
可塑性樹脂により変化させる必要がある。The softening temperature in the present invention is defined by JIS K
Method B of 7207 (Bending stress applied to test piece 4.6 kgf
/ Cm 2 ) is defined as a temperature 10 degrees lower than the deflection temperature under load of the thermoplastic resin measured by the method specified in ( 2 ). In the present invention, the temperature of the mold surface needs to be equal to or higher than the softening temperature defined in this way. Further, the softening temperature needs to be changed depending on the thermoplastic resin used.
【００２１】金型表面の温度を、熱可塑性樹脂を射出成
形する前に予め前記の軟化温度以上にしておけば、溶融
した熱可塑性樹脂が金型表面に接触した時の冷却速度を
低下させることができるため、溶融した熱可塑性樹脂が
固化する前に微細凹凸部に入り込み、転写性を向上させ
ることができる。また、金型内部を流動する溶融樹脂の
抵抗が少なくなるため、射出速度や射出圧力を必要以上
に大きくせず射出成形することが可能となり、溶融した
熱可塑性樹脂を充填する際のせん断発熱によるシルバー
ストリークス、金型表面と溶融した熱可塑性樹脂との摩
擦抵抗によるジェッティングやフローマーク等の外観不
良、及び成形品中の残留応力による反りや変形を低減す
ることができる。If the temperature of the mold surface is previously set to the above-mentioned softening temperature before injection molding of the thermoplastic resin, the cooling rate when the molten thermoplastic resin comes into contact with the mold surface is reduced. Therefore, before the molten thermoplastic resin solidifies, it can enter the fine irregularities and improve the transferability. In addition, since the resistance of the molten resin flowing inside the mold is reduced, the injection molding can be performed without increasing the injection speed and the injection pressure more than necessary, and the heat generated by shearing when the molten thermoplastic resin is filled. Silver streaks, poor appearance such as jetting and flow marks due to frictional resistance between the mold surface and the molten thermoplastic resin, and warpage and deformation due to residual stress in a molded product can be reduced.
【００２２】本発明の射出成形方法は、少なくとも一方
の面に微細な凹凸形状が付与された板状成形品を成形す
るものであり、微細な凹凸形状は市販の光学顕微鏡又は
電子顕微鏡により観察することができる。得られる観察
像から、微細な凹凸形状は、凹凸形状単位の規則的な配
列によって構成されているか、不均一に表面が粗されて
いるのかが判断できる。According to the injection molding method of the present invention, a plate-like molded article having at least one surface provided with fine irregularities is molded, and the fine irregularities are observed by a commercially available optical microscope or electron microscope. be able to. From the obtained observation image, it can be determined whether the fine unevenness is formed by a regular arrangement of the uneven shape units or the surface is unevenly roughened.
【００２３】凹凸形状単位が規則的に配列して微細凹凸
形状が構成されている場合、その構成単位はプリズム形
状で、かつプリズム形状の高さａと配列ピッチｂとの比
ｂ／ａが０．２〜５００の範囲にあることが好ましい。
図３（Ａ）に示すように、プリズム形状の高さａとはプ
リズム頂角部分の高さ、配列ピッチｂとは隣り合うプリ
ズム頂点間の距離と定義する。ｂ／ａが０．２〜５００
の範囲内にあれば、形状の高さａと配列ピッチｂは、縦
又は横方向で任意に変化しても良い。またプリズム形状
の配列は、例えば図３（Ｂ）のような直線状、図３
（Ｃ）のような曲線状、更に図３（Ｄ）のようなドット
状の配列でも良い。When the fine irregularities are formed by regularly arranging the irregularity units, the constituent units are prismatic, and the ratio b / a between the height a of the prismatic shape and the arrangement pitch b is 0. It is preferably in the range of 0.2 to 500.
As shown in FIG. 3A, the height a of the prism shape is defined as the height of the prism apex, and the arrangement pitch b is defined as the distance between adjacent prism vertices. b / a is 0.2 to 500
, The height a and the arrangement pitch b of the shapes may be arbitrarily changed in the vertical or horizontal direction. The prism-shaped arrangement is, for example, a straight line as shown in FIG.
A curved array as shown in FIG. 3C and a dot array as shown in FIG.
【００２４】また、微細な凹凸形状の構成単位として立
方体状、直方体状、円筒状、楕円筒状のいずれかの形状
で、かつ当該形状における高さａと配列ピッチｂとの比
ｂ／ａが２〜５０である場合も好ましい。図４に示すよ
うに、形状の高さａとは立方体状、直方体状、円筒状、
楕円筒状の何れかの高さ、配列ピッチｂとは隣り合う形
状の中心位置間の距離と定義する。ｂ／ａが２〜５０の
範囲内にあれば、形状の高ａさと配列ピッチｂは、縦又
は横方向で任意に変化しても良い。形状の高さａと配列
ピッチｂは、光学顕微鏡又は電子顕微鏡の観察像から視
覚的に測定することができる。Further, as a constitutional unit of the fine unevenness, any one of a cubic shape, a rectangular parallelepiped shape, a cylindrical shape, and an elliptic cylindrical shape, and the ratio b / a of the height a and the arrangement pitch b in the shape is set. The case of 2 to 50 is also preferable. As shown in FIG. 4, the height a of the shape is a cubic shape, a rectangular parallelepiped shape, a cylindrical shape,
The height and arrangement pitch b of any of the elliptical cylinders are defined as the distance between the center positions of adjacent shapes. If b / a is in the range of 2 to 50, the shape height a and the arrangement pitch b may be arbitrarily changed in the vertical or horizontal direction. The height a of the shape and the arrangement pitch b can be visually measured from an observation image of an optical microscope or an electron microscope.
【００２５】微細な凹凸形状の構成単位が球面状または
非球面状の形状で、かつ当該形状における高さａとピッ
チｂとの比ｂ／ａが０．２〜５００である場合も好まし
い。図５（Ａ）に示すように、形状の高さａとは球面又
は非球面部分の高さ、配列ピッチｂとは隣り合う形状の
中心位置間の距離と定義する。ｂ／ａが０．２〜５００
の範囲内にあれば、形状の高さａと配列ピッチｂは、縦
又は横方向で任意に変化しても良い。球面状または非球
面形状の高さａと配列ピッチｂは、光学顕微鏡又は電子
顕微鏡の観察像から視覚的に測定することができる。ま
た、球面状または非球面形状の配列は、例えば図５
（Ｂ）のような直線状、図５（Ｃ）のような曲線状、更
には図５（Ｄ）のようなドット状の配列でも良い。It is also preferable that the constituent units of the fine unevenness are spherical or aspherical, and the ratio b / a of the height a to the pitch b in the shape is 0.2 to 500. As shown in FIG. 5A, the shape height a is defined as the height of the spherical or aspherical portion, and the arrangement pitch b is defined as the distance between the center positions of adjacent shapes. b / a is 0.2 to 500
, The height a and the arrangement pitch b of the shapes may be arbitrarily changed in the vertical or horizontal direction. The height a and the arrangement pitch b of the spherical or aspherical shape can be visually measured from an observation image of an optical microscope or an electron microscope. Further, the arrangement of the spherical or aspherical surface is, for example, as shown in FIG.
A linear shape as shown in FIG. 5B, a curved shape as shown in FIG. 5C, and a dot-shaped array as shown in FIG.
【００２６】これらの各種の形状の高さａと配列ピッチ
ｂは、光学顕微鏡又は電子顕微鏡の観察像から視覚的に
測定することができる。The height “a” and the arrangement pitch “b” of these various shapes can be visually measured from observation images of an optical microscope or an electron microscope.
【００２７】更に、微細な凹凸形状面が梨地状である場
合も好ましく、この場合、ＪＩＳ・Ｂ０６０１−１９９
４法により表面粗さの最大高さ（Ｒｙ）を測定した時に
１〜１００μｍの範囲にあることが好ましい。梨地状面
の表面粗さは、市販の表面粗さ計を用いて測定すること
ができる。Further, it is also preferable that the fine uneven surface has a satin finish. In this case, JIS B0601-199
When the maximum height (Ry) of the surface roughness is measured by the four methods, it is preferably in the range of 1 to 100 μm. The surface roughness of the satin-like surface can be measured using a commercially available surface roughness meter.
【００２８】本発明に用いられる熱可塑性樹脂は、具体
的にはメタクリル樹脂、ポリカーボネイト樹脂、ポリス
チレン、ゴム補強ポリスチレン、アクリロニトリル−ブ
タジエン−スチレン共重合体、スチレン−メチルメタク
リレート共重合樹脂、スチレン−ブタジエン共重合樹
脂、ポリエチレン、ポリプロピレン、非晶質ポリオレフ
ィン樹脂ナイロン６、ナイロン６６、変性ポリフェニレ
ンエーテル等が挙げられる。好ましく採用されるもの
は、メタクリル樹脂又はポリカーボネイト樹脂である。
特に好ましく採用されるものはメタクリル樹脂である。Specific examples of the thermoplastic resin used in the present invention include methacrylic resin, polycarbonate resin, polystyrene, rubber-reinforced polystyrene, acrylonitrile-butadiene-styrene copolymer, styrene-methyl methacrylate copolymer resin, and styrene-butadiene copolymer. Polymerized resin, polyethylene, polypropylene, amorphous polyolefin resin nylon 6, nylon 66, modified polyphenylene ether and the like can be mentioned. Those preferably employed are methacrylic resins or polycarbonate resins.
Particularly preferred is a methacrylic resin.
【００２９】メタクリル樹脂は、メタクリル酸メチルを
主体とする樹脂が挙げられ、これにはメチルメタクリレ
ートの単独重合体、又はメチルメタクリレートとメチル
アクリレート、エチルアクリレート、ｎ−プロピルアク
リレート、イソプロピルアクリレート、ブチルアクリレ
ート、アクリロニトリル、アクリル酸、メタクリル酸、
ビニルピリジン、ビニルモルホリン、ビニルピリドンテ
トラヒドロフルフリルアクリレート、Ｎ，Ｎ−ジメチル
アミノエチルアクリレート、Ｎ，Ｎ−ジメチルアクリル
アミド、２−ヒドロキシアクリレート、エチレングリコ
ールモノアクリレート、グリセリンモノアクリレート、
無水マレイン酸、スチレン、もしくはα−メチルスチレ
ンなどの共重合可能なモノマーのいずれか一つ以上との
共重合体、及び耐熱性アクリル樹脂、低吸湿性アクリル
樹脂などが含まれる。これらは単独で用いてもよいしブ
レンドして用いてもよい。透明性を維持して耐衝撃性を
同時に持たせるためには耐衝撃性アクリル樹脂が用いら
れ、そのゴム弾性体は特開昭５３−５８５５４号公報、
同５５−９４９１７号公報、同６１−３２３４６号公報
等に開示されている。簡単に説明すると、アクリル系重
合体芯材料のまわりに弾性層及び非弾性層を交互に生成
させる多段階逐次重合法により製造される多段重合体で
ある。Examples of the methacrylic resin include resins mainly composed of methyl methacrylate, such as a homopolymer of methyl methacrylate, or methyl methacrylate and methyl acrylate, ethyl acrylate, n-propyl acrylate, isopropyl acrylate, butyl acrylate, and the like. Acrylonitrile, acrylic acid, methacrylic acid,
Vinylpyridine, vinylmorpholine, vinylpyridonetetrahydrofurfuryl acrylate, N, N-dimethylaminoethyl acrylate, N, N-dimethylacrylamide, 2-hydroxyacrylate, ethylene glycol monoacrylate, glycerin monoacrylate,
It includes a copolymer with any one or more of copolymerizable monomers such as maleic anhydride, styrene, and α-methylstyrene, and a heat-resistant acrylic resin, a low-hygroscopic acrylic resin, and the like. These may be used alone or as a blend. In order to maintain transparency and simultaneously provide impact resistance, an impact-resistant acrylic resin is used, and its rubber elastic body is disclosed in JP-A-53-55854.
Nos. 55-94917 and 61-32346. Briefly, it is a multi-stage polymer produced by a multi-stage sequential polymerization method in which an elastic layer and an inelastic layer are alternately formed around an acrylic polymer core material.
【００３０】本発明の射出成形方法によって得られる板
状成形品の厚みは特に限定されないが、好ましくは０．
１〜１０ｍｍ、更に好ましくは０．５〜５ｍｍである。The thickness of the plate-like molded product obtained by the injection molding method of the present invention is not particularly limited, but preferably is not less than 0.1.
It is 1 to 10 mm, more preferably 0.5 to 5 mm.
【００３１】また、本発明の射出成形方法によって得ら
れる板状成形品としては、面照明光源装置用導光板が好
ましい。液晶表示装置等に用いられる面照明光源装置
は、特に明るさに対する要求が高く、使用される導光板
についても微細凹凸形状の転写性が高く、残留応力によ
る成形歪みが小さいことが望まれている。導光板の少な
くとも一方の表面に金型に施した微細凹凸形状を転写す
ることにより、導光板表面の発光効率を高めることがで
き、また残留応力による成形歪みを小さくすることによ
り面照明光源装置の輝度を低下させずに均一にすること
ができる。従って、本発明の面照明光源装置用導光板
は、微細凹凸形状の転写状態が良いため、発光効率が高
く、残留応力による成形歪みが小さいため輝度の低下が
なく、諸性能に非常に優れている。As the plate-like molded product obtained by the injection molding method of the present invention, a light guide plate for a surface illumination light source device is preferable. Surface illumination light source devices used for liquid crystal display devices and the like are particularly demanded for brightness, and it is desired that light guide plates used have high transferability of fine irregularities and small molding distortion due to residual stress. . By transferring the fine irregularities formed on the mold to at least one surface of the light guide plate, the luminous efficiency of the light guide plate surface can be increased, and the molding distortion due to the residual stress can be reduced to reduce the surface illumination light source device. The brightness can be made uniform without lowering. Therefore, the light guide plate for a surface illumination light source device of the present invention has a good transfer state of the fine irregularities, high luminous efficiency, small molding distortion due to residual stress, no reduction in luminance, and excellent performance. I have.
【００３２】[0032]
【実施例】以下、実施例及び比較例で本発明を更に具体
的に説明する。なお、各実施例及び比較例で用いた評価
及び試験方法は次の通りである。The present invention will be described more specifically below with reference to examples and comparative examples. The evaluation and test methods used in each of the examples and comparative examples are as follows.
【００３３】（１）表面に微細な凹凸形状を有する成形
品の成形 図６に示されるように、表面に微細な凹凸形状を有する
厚さ０．３ｍｍの強磁性金属板６４を固定側６１に組み
込んだ入れ子式金型を、射出成形機（住友重機械工業社
製「ＳＧ−１００型」）に取り付け、金属板６４の表面
から５ｍｍの位置にインダクター６３を近付けた後、２
５ＫＨｚ、３０ＫＷの高周波電源により６秒間金属板６
４の表面を誘導加熱する。その後、すばやくインダクタ
ー６３を金型間（固定側６１と移動側６２間）より抜き
出し、移動側６２を前進させて金型を閉じて射出成形を
行う。インダクター６３は、断面積１０ｍｍ3 の銅管を
互いに絶縁された状態で５ｍｍ間隔で渦巻き状に配置し
て皿形にし、それらを重ね合わせて耐熱シリコン樹脂で
注型して平板状に固定固化して作成する。この方法によ
り、図７に示すような片面に微細凹凸形状を有する投影
面積３２０ｃｍ2 の成形品を得る。熱可塑性樹脂として
はメタクリル樹脂を用いた。(1) Molding of a molded article having fine irregularities on the surface As shown in FIG. 6, a 0.3 mm thick ferromagnetic metal plate 64 having fine irregularities on the surface is fixed on the fixed side 61. The assembled nested mold is attached to an injection molding machine (“SG-100” manufactured by Sumitomo Heavy Industries, Ltd.), and after bringing the inductor 63 close to a position 5 mm from the surface of the metal plate 64,
Metal plate 6 for 6 seconds with high frequency power supply of 5KHz, 30KW
4 is induction heated. Thereafter, the inductor 63 is quickly pulled out from between the dies (between the fixed side 61 and the moving side 62), the moving side 62 is advanced, the die is closed, and injection molding is performed. The inductor 63 is a copper tube having a cross-sectional area of 10 mm 3 and is spirally arranged at 5 mm intervals in a state of being insulated from each other to form a dish. To create. By this method, a molded product having a projected area of 320 cm 2 having fine irregularities on one surface as shown in FIG. 7 is obtained. A methacrylic resin was used as the thermoplastic resin.
【００３４】（２）成形品の表面形状の転写率の測定 上記（１）で用いた微細凹凸形状を有する金属板６４
（図６参照）、及び上記（１）の方法で得られた成形品
の表面及び断面形状をレーザー顕微鏡（レーザーテック
社製「１ＬＭ２１Ｗ型」）で観察し、２次元平面像と３
次元立体像を得る。得られた像から、金属板凹部の容積
と成形品凸部の容積を求め、次の計算式によって定義さ
れる転写率を導出する。実質的には、転写率が０．７以
上であれば微細凹凸形状が転写された成形品として好ま
しいと判断できる。(2) Measurement of transfer rate of surface shape of molded product Metal plate 64 having fine irregularities used in (1) above
(See FIG. 6), and the surface and cross-sectional shape of the molded article obtained by the method (1) were observed with a laser microscope (Lasertec “1LM21W”), and a two-dimensional plane image and 3D image were obtained.
Obtain a three-dimensional image. From the obtained image, the volume of the concave portion of the metal plate and the volume of the convex portion of the molded product are obtained, and a transfer rate defined by the following formula is derived. Substantially, if the transfer rate is 0.7 or more, it can be determined that the molded article on which the fine irregularities are transferred is preferable.
【００３５】（転写率）＝（成形品凸部の容積）／（金
属板凹部の容積） （３）成形品の反り量の測定 上記（１）の方法で得られた成形品を金属定盤上に置
き、図７に示すゲート位置７１近くの成形品の角（７２
の位置）に質量２００ｇの立方体形状のおもりを載せ
る。この時、ゲート対面の位置（７３の位置）で成形品
と定盤との間にできる隙間をダイヤルゲージにて測定す
る。実質的には、反り量が０．２ｍｍ以下であれば成形
品の寸法精度として好ましい範囲であると判断できる。(Transfer rate) = (Volume of convex portion of molded product) / (Volume of concave portion of metal plate) (3) Measurement of amount of warpage of molded product The molded product obtained by the above method (1) is placed on a metal platen. Placed on top and the corner (72
Position), a cubic weight having a mass of 200 g is placed. At this time, a gap formed between the molded product and the surface plate at the position facing the gate (the position 73) is measured with a dial gauge. Practically, if the amount of warpage is 0.2 mm or less, it can be determined that the dimensional accuracy of the molded product is in a preferable range.
【００３６】（４）成形品の外観の評価 上記（１）の方法で得られた成形品を目視で観察し、シ
ルバーストリークス、ジェッティング、フローマーク、
ウェルドライン等の成形に伴う外観不良、及びクラッ
ク、クレージング等の材料強度不足に伴う外観不良を観
察する。(4) Evaluation of Appearance of Molded Article The molded article obtained by the above-mentioned method (1) was visually observed, and silver streaks, jetting, flow marks,
Observation of poor appearance due to molding such as weld lines and poor appearance due to insufficient material strength such as cracks and crazing.
【００３７】（５）成形品の環境試験 上記（３）、（４）の測定を行った成形品を７０℃のギ
アオーブン（タバイエスペック社製「ＧＰＨＨ−２００
型」）中に４８時間エージングし、２３℃×５０％ＲＨ
の恒温室にて２４時間放置した後、再び上記（３）、
（４）の測定を行い、エージング前後の反り量、及び外
観を比較評価する。反り量、外観の変化がないことが好
ましいが、反りの変化量については、実質的には０．２
ｍｍ以下であれば環境試験による成形品の寸法精度は保
たれる範囲であり、好ましいと判断できる。(5) Environmental Test of Molded Article The molded article subjected to the above measurements (3) and (4) was subjected to a 70 ° C. gear oven ("GPHH-200" manufactured by Tabai Espec Corp.).
Mold)) for 48 hours, 23 ° C x 50% RH
After standing in the constant temperature room for 24 hours, the above (3),
The measurement of (4) is performed, and the warpage before and after aging and the appearance are compared and evaluated. It is preferable that there is no change in the amount of warpage and appearance, but the amount of change in warpage is substantially 0.2.
If it is not more than mm, it is within a range where the dimensional accuracy of the molded article by the environmental test is maintained, and it can be judged that it is preferable.
【００３８】（６）成形品の成形歪みの測定 図８に示すように 前記（１）の方法で得られた成形品
８２を、偏光方向が互いに直角になるように配置した２
枚の偏光板８１で挟み、下側の偏光板８１を一様に蛍光
ランプ８４で照らす。成形品８２内部に成形歪みを生じ
ている場合、複屈折現象によりその部分のみ偏光角が変
化し上側の偏光板８１を光が透過する。部分的に透過し
た光量を輝度計８３（ミノルタカメラ社製「ＣＡ−１０
００型」）で測定し、輝度値を成形歪み量として定義す
る。輝度値が大きいほど成形歪み量が大きいと評価でき
る。(6) Measurement of Molding Distortion of Molded Article As shown in FIG. 8, molded articles 82 obtained by the method (1) are arranged so that the polarization directions are perpendicular to each other.
The lower polarizing plate 81 is uniformly illuminated by a fluorescent lamp 84 while being sandwiched between two polarizing plates 81. When a molding distortion occurs in the molded article 82, the polarization angle changes only in that part due to the birefringence phenomenon, and the light is transmitted through the upper polarizing plate 81. The amount of partially transmitted light is measured using a luminance meter 83 (“CA-10” manufactured by Minolta Camera Co., Ltd.).
The luminance value is defined as the amount of molding distortion. It can be evaluated that the larger the luminance value is, the larger the molding distortion amount is.
【００３９】実施例１及び２ 熱可塑性樹脂として、メタクリル樹脂成形材料（旭化成
工業社製「デルペット７０ＮＨＸ」）を使用した。ＪＩ
Ｓ・Ｋ−７２１０のＡ法で測定したメルトフローレイト
は６．５ｇ／１０分、ＪＩＳ・Ｋ−７２０７のＢ法で測
定した荷重たわみ温度は９５℃である。本発明で定義さ
れる軟化温度は８５℃である。Examples 1 and 2 As a thermoplastic resin, a methacrylic resin molding material ("Delpet 70NHX" manufactured by Asahi Kasei Kogyo Co., Ltd.) was used. JI
The melt flow rate measured by the method A of SK-7210 is 6.5 g / 10 min, and the deflection temperature under load measured by the method B of JIS K-7207 is 95 ° C. The softening temperature defined in the present invention is 85 ° C.
【００４０】微細凹凸形状の構成単位がプリズム形状
で、しかもこの構成単位が直線状に配列された金属板を
組み込んだ金型を用い、表１に示す射出速度、保圧力の
条件で射出成形を行った。成形温度は２４０℃とした。
微細な凹凸形状の高さａと配列ピッチｂの比ｂ／ａは２
である。また、高周波誘導加熱後の金型温度は表１に示
す温度とした。Injection molding was performed under the conditions of the injection speed and holding pressure shown in Table 1 using a mold in which the constituent units of the fine concavo-convex shape were prismatic, and in which a metal plate in which the constituent units were linearly assembled was incorporated. went. The molding temperature was 240 ° C.
The ratio b / a of the height a of the fine unevenness to the arrangement pitch b is 2
It is. The mold temperature after high-frequency induction heating was the temperature shown in Table 1.
【００４１】得られた成形品を試験片として、前記
（２）〜（５）の評価を行った。その結果を表２に示
す。Using the obtained molded product as a test piece, the evaluations of the above (2) to (5) were performed. Table 2 shows the results.
【００４２】表２からも明らかなように、実施例１、２
は、転写率は０．７６、０．７４を示し、非常に優れた
結果が得られた。また、反り、外観についても良好なも
のであった。更に、環境試験後も成形品の反り変化量は
両者共に０．１ｍｍと小さく、しかも外観変化もなく、
この点でも優れたものであった。As is clear from Table 2, Examples 1 and 2
Shows that the transfer rates were 0.76 and 0.74, and very excellent results were obtained. Also, the warpage and appearance were good. Furthermore, even after the environmental test, the amount of warpage change of the molded article is as small as 0.1 mm for both, and there is no change in appearance,
This point was also excellent.
【００４３】比較例１ 高周波誘導加熱を行わず、金型温度６０℃で射出した以
外は総て実施例１及び２と同じ条件で射出成形を行い、
得られた成形品を試験片として前記（２）〜（５）の評
価を行った結果を表２に示す。Comparative Example 1 Injection molding was performed under the same conditions as in Examples 1 and 2 except that high-frequency induction heating was not performed and injection was performed at a mold temperature of 60 ° C.
Table 2 shows the results of the evaluation of the above (2) to (5) using the obtained molded article as a test piece.
【００４４】表２からも明らかなように、反り、外観は
良好であったが、転写率が０．５３と小さく、表面形状
が充分に転写されているとは言えないものであった。As is clear from Table 2, the warpage and appearance were good, but the transfer rate was as small as 0.53, and the surface shape was not sufficiently transferred.
【００４５】比較例２ メタクリル樹脂成形材料として、旭化成工業社製の「デ
ルペット７２０Ｖ」（ＪＩＳ・Ｋ−７２１０のＡ法で測
定したメルトフローレイトは２２ｇ／１０分、ＪＩＳ・
Ｋ−７２０７のＢ法で測定した荷重たわみ温度は９３
℃）を使用した以外は総て総て比較例１と同じ条件で射
出成形を行い、得られた成形品を試験片として前記
（２）〜（５）の評価を行った結果を表２に示す。Comparative Example 2 As a methacrylic resin molding material, "Delpet 720V" manufactured by Asahi Kasei Kogyo Co., Ltd. (melt flow rate measured by the method A of JIS K-7210 is 22 g / 10 min.
The deflection temperature under load measured by the B method of K-7207 is 93.
C)), except that injection molding was carried out under the same conditions as in Comparative Example 1 except that the obtained molded articles were used as test specimens, and the results of the above evaluations (2) to (5) were performed. Show.
【００４６】表２からも明らかなように、転写率は０．
７を示すが、ウェルドラインが発生し、また環境試験後
の反り変化量が０．４ｍｍと大きく、しかもクラックが
発生した。As is evident from Table 2, the transfer rate was 0.1%.
As shown in FIG. 7, a weld line was generated, the warp change after the environmental test was as large as 0.4 mm, and cracks were generated.
【００４７】実施例３〜５ 微細凹凸形状の構成単位が直方体形状で、ドット状に配
列された金属板を組み込んだ金型を用い、表１に示す高
周波誘導加熱後の金型温度、射出速度、保圧力の条件で
射出成形を行った以外は総て実施例１〜２と同じ条件で
射出成形を行った。微細な凹凸形状の高さａと配列ピッ
チｂの比ｂ／ａは２０である。Examples 3 to 5 The mold temperature and injection speed after high-frequency induction heating shown in Table 1 were used in a mold in which the structural units of the fine unevenness were rectangular parallelepiped and in which metal plates arranged in a dot shape were incorporated. Injection molding was performed under the same conditions as in Examples 1 and 2 except that injection molding was performed under the conditions of holding pressure. The ratio b / a of the height a of the fine irregularities to the arrangement pitch b is 20.
【００４８】得られた成形品を試験片として、前記
（２）〜（４）、（６）の評価を行った。その結果を表
３に示す。The obtained molded article was used as a test piece, and the evaluations (2) to (4) and (6) were performed. Table 3 shows the results.
【００４９】表３からも明らかなように、実施例３〜５
は、転写率は０．７７、０．７８、０．７５を示し、非
常に優れた結果が得られた。また、反り、外観について
も良好なものであった。更に、成形歪み量を表す輝度値
も２７、２３、３２ｎｔと小さく、成形歪みが小さな成
形品が得られた。As is clear from Table 3, Examples 3 to 5
Indicates that the transfer rates were 0.77, 0.78, and 0.75, and very excellent results were obtained. Also, the warpage and appearance were good. Furthermore, the luminance values representing the amount of molding distortion were also small at 27, 23, and 32 nt, and a molded product with small molding distortion was obtained.
【００５０】比較例３及び４ 高周波誘導加熱を行わず、金型温度６０℃で射出すると
共に、射出速度、保圧力の条件を表１に示すように変化
させた以外は総て実施例３及び５と同じ条件で射出成形
を行い、得られた成形品を試験片として前記（２）〜
（４）、（６）の評価を行った結果を表３に示す。Comparative Examples 3 and 4 Injection was performed at a mold temperature of 60 ° C. without performing high-frequency induction heating, and the conditions of injection speed and holding pressure were changed as shown in Table 1. Injection molding was performed under the same conditions as in Example 5, and the obtained molded article was used as a test piece as described in (2) to (2) above.
Table 3 shows the evaluation results of (4) and (6).
【００５１】比較例３、４は、転写率は０．５５、０．
５８と低く、成形歪み量も大きいものでしかなかった。
また、成形歪み量を表す輝度値も５８、５５ｎｔと大き
く、成形歪みの大きい成形品であった。In Comparative Examples 3 and 4, the transfer rate was 0.55, 0.
58 and a large amount of molding distortion.
Further, the luminance value representing the amount of molding distortion was as large as 58 and 55 nt, and the molded product was large in molding distortion.
【００５２】[0052]
【表１】 [Table 1]
【００５３】[0053]
【表２】 [Table 2]
【００５４】[0054]
【表３】 [Table 3]
【００５５】[0055]
【発明の効果】以上説明した通り、本発明の射出成形法
によれば、微細な凹凸形状を有する成形品を、熱可塑性
樹脂が本来持つ物性を低下させず、外観不良や変形等を
伴わずに工業的に安定して生産することができる。ま
た、本発明の射出成形品は、種々の機能において優れ、
特に面照明光源用導光板として優れた性能を有するもの
である。As described above, according to the injection molding method of the present invention, a molded article having fine irregularities can be produced without deteriorating the physical properties inherent to the thermoplastic resin and without causing poor appearance or deformation. It can be produced industrially stably. Further, the injection molded article of the present invention is excellent in various functions,
In particular, it has excellent performance as a light guide plate for a surface illumination light source.
【図１】本発明の射出成形方法で行う高周波誘導加熱の
概念図である。FIG. 1 is a conceptual diagram of high-frequency induction heating performed by the injection molding method of the present invention.
【図２】図１に示す高周波誘導加熱を行った場合の金型
の温度分布の一例を示すグラフである。FIG. 2 is a graph showing an example of a temperature distribution of a mold when the high-frequency induction heating shown in FIG. 1 is performed.
【図３】微細な凹凸形状の構成単位の形状例と、形状高
さａ及び配列ピッチｂの関係を示す説明図である。FIG. 3 is an explanatory diagram showing an example of the shape of a constituent unit of a fine uneven shape, and the relationship between a shape height a and an arrangement pitch b.
【図４】他の微細な凹凸形状の構成単位の形状例と、形
状高さａ及び配列ピッチｂの関係を示す説明図である。FIG. 4 is an explanatory diagram showing an example of the shape of a constituent unit of another fine uneven shape, and the relationship between the shape height a and the arrangement pitch b.
【図５】更に他の微細な凹凸形状の構成単位の形状例
と、形状高さａ及び配列ピッチｂの関係を示す説明図で
ある。FIG. 5 is an explanatory view showing a shape example of a constituent unit of still another fine concavo-convex shape, and a relationship between a shape height a and an arrangement pitch b.
【図６】実施例で用いた金型の概念図である。FIG. 6 is a conceptual diagram of a mold used in the embodiment.
【図７】実施例で成形した成形品についての反り量の測
定方法の説明図である。FIG. 7 is an explanatory diagram of a method for measuring a warpage amount of a molded article molded in an example.
【図８】実施例で行った成形歪み測定方法の説明図であ
る。FIG. 8 is an explanatory diagram of a molding strain measuring method performed in an example.
１１ 金型の固定側 １２ 金型の移動側 １３ インダクター ６１ 金型の固定側 ６２ 金型の移動側 ６３ インダクター ６４ 微細な凹凸形状を有する金属板 ７１ 成形品のゲート位置 ７２ 成形品の反り量測定のためにおもりを置く位置 ７３ 成形品の反り量を測定する位置 ８１ 偏光板 ８２ 成形品 ８３ 輝度計 ８４ 蛍光ランプ Reference Signs List 11 Mold fixed side 12 Mold moving side 13 Inductor 61 Mold fixed side 62 Mold moving side 63 Inductor 64 Metal plate having fine irregularities 71 Gate position of molded product 72 Measurement of warpage of molded product 73 Position for measuring the amount of warpage of molded product 81 Polarizing plate 82 Molded product 83 Luminance meter 84 Fluorescent lamp
Claims (8)
の面に微細な凹凸形状が付与された板状成形品を射出成
形する方法に於いて、該凹凸形状を転写させる金型表面
を予め該熱可塑性樹脂の軟化温度以上に高周波誘導加熱
して射出成形することを特徴とする微細な凹凸形状付成
形品の射出成形方法。In a method for injection-molding a plate-like molded product having a fine irregular shape on at least one surface thereof using a thermoplastic resin, a mold surface on which the irregular shape is transferred is prepared in advance. An injection molding method for a molded article having fine irregularities, characterized by performing high-frequency induction heating at a temperature higher than the softening temperature of a thermoplastic resin and injection molding.
位として配列されて成り、かつプリズム形状の高さａと
配列ピッチｂとの比ｂ／ａが０．２〜５００であること
を特徴とする請求項１に記載された射出成形方法。2. The method according to claim 1, wherein the fine irregularities are arranged with the prism shape as a constituent unit, and the ratio b / a of the height a of the prism shape to the arrangement pitch b is 0.2 to 500. The injection molding method according to claim 1.
円筒状、楕円筒状の何れかの形状を構成単位として配列
されて成り、かつ構成単位の形状の高さａと配列ピッチ
ｂとの比ｂ／ａが２〜５０であることを特徴とする請求
項１に記載された射出成形方法。3. The fine uneven shape is a cubic shape, a rectangular parallelepiped shape,
It is characterized by being arranged in any one of a cylindrical shape and an elliptic cylindrical shape as a constituent unit, and a ratio b / a of a height a of the constituent unit shape to an arrangement pitch b is 2 to 50. The injection molding method according to claim 1.
Ｂ０６０１−１９９４法により測定した該凹凸形状面の
表面粗さの最大高さ（Ｒy ）が１〜１００μｍとなるこ
とを特徴とする請求項１に記載された射出成形方法。4. The fine uneven surface has a satin-like shape,
The injection molding method according to claim 1, wherein the maximum height ( Ry ) of the surface roughness of the uneven surface measured by the B0601-1994 method is 1 to 100 m.
の形状を構成単位として配列されて成り、かつ形状の高
さａとピッチｂとの比ｂ／ａが０．２〜５００であるこ
とを特徴とする請求項１に記載された射出成形方法。5. A fine unevenness is formed by arranging a spherical or aspherical shape as a constituent unit, and a ratio b / a of a height a to a pitch b of the shape is 0.2 to 500. The injection molding method according to claim 1, wherein:
リカーボネイト樹脂であることを特徴とする請求項１〜
５のいずれかに記載された射出成形方法。6. The thermoplastic resin according to claim 1, wherein the thermoplastic resin is a methacrylic resin or a polycarbonate resin.
5. The injection molding method according to any one of 5.
出成形方法を用いて成形されたことを特徴とする微細な
凹凸形状付板状成形品。7. A plate-shaped molded product having fine irregularities, which is molded by using the injection molding method according to claim 1.
出成形方法を用いて成形されたことを特徴とする面照明
光源用導光板。8. A light guide plate for a surface illumination light source, which is formed by using the injection molding method according to claim 1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23828496A JPH1080940A (en) | 1996-09-10 | 1996-09-10 | Injection molding method of moldings with fine uneven form and moldings with fine uneven form |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP23828496A JPH1080940A (en) | 1996-09-10 | 1996-09-10 | Injection molding method of moldings with fine uneven form and moldings with fine uneven form |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH1080940A true JPH1080940A (en) | 1998-03-31 |
Family
ID=17027912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP23828496A Withdrawn JPH1080940A (en) | 1996-09-10 | 1996-09-10 | Injection molding method of moldings with fine uneven form and moldings with fine uneven form |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH1080940A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000326356A (en) * | 1999-03-15 | 2000-11-28 | Sumitomo Chem Co Ltd | Manufacture of light guiding plate made of acrylic resin |
| JP2002096362A (en) * | 2000-09-22 | 2002-04-02 | Teijin Chem Ltd | Injection-molded article of delustered polycarbonate resin |
| JPWO2005075184A1 (en) * | 2004-02-04 | 2007-10-11 | 住友重機械工業株式会社 | Pressure molding apparatus, mold and pressure molding method |
| JP2008087171A (en) * | 2006-09-29 | 2008-04-17 | Sumitomo Chemical Co Ltd | Manufacturing method of thermoplastic resin molded object |
| JP2011025457A (en) * | 2009-07-22 | 2011-02-10 | Sumitomo Chemical Co Ltd | Method for manufacturing thin-wall molding |
| JP2019135287A (en) * | 2018-02-05 | 2019-08-15 | ユーエムジー・エービーエス株式会社 | Thermoplastic resin composition and molded article thereof |
-
1996
- 1996-09-10 JP JP23828496A patent/JPH1080940A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000326356A (en) * | 1999-03-15 | 2000-11-28 | Sumitomo Chem Co Ltd | Manufacture of light guiding plate made of acrylic resin |
| JP2002096362A (en) * | 2000-09-22 | 2002-04-02 | Teijin Chem Ltd | Injection-molded article of delustered polycarbonate resin |
| JPWO2005075184A1 (en) * | 2004-02-04 | 2007-10-11 | 住友重機械工業株式会社 | Pressure molding apparatus, mold and pressure molding method |
| JP2008087171A (en) * | 2006-09-29 | 2008-04-17 | Sumitomo Chemical Co Ltd | Manufacturing method of thermoplastic resin molded object |
| JP2011025457A (en) * | 2009-07-22 | 2011-02-10 | Sumitomo Chemical Co Ltd | Method for manufacturing thin-wall molding |
| JP2019135287A (en) * | 2018-02-05 | 2019-08-15 | ユーエムジー・エービーエス株式会社 | Thermoplastic resin composition and molded article thereof |
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