JPH09208717A - Biaxially oriented polystyrene-based resin sheet - Google Patents
Biaxially oriented polystyrene-based resin sheetInfo
- Publication number
- JPH09208717A JPH09208717A JP1634796A JP1634796A JPH09208717A JP H09208717 A JPH09208717 A JP H09208717A JP 1634796 A JP1634796 A JP 1634796A JP 1634796 A JP1634796 A JP 1634796A JP H09208717 A JPH09208717 A JP H09208717A
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- Japan
- Prior art keywords
- styrene
- sheet
- rubber
- resin
- particle diameter
- 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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- Manufacture Of Macromolecular Shaped Articles (AREA)
- Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、２軸延伸シ−トと
した際、透明性、シリコ−ンオイルの均一塗布性、シ−
トの剥離性、シートの腰、衝撃強度、および積み重ね成
形品の剥離性が良好な２軸延伸ポリスチレン系樹脂シ−
トに関する。TECHNICAL FIELD The present invention relates to a biaxially stretched sheet having transparency, uniform coating property of silicone oil, and sheet.
Biaxially stretched polystyrene resin sheet with excellent peelability, sheet stiffness, impact strength, and stackability
About.
【０００２】[0002]
【従来の技術】２軸延伸されたポリスチレン系樹脂シ−
トは、その透明性および腰の強さから食品包装分野に広
く利用されている。しかしこの２軸延伸されたシ−トは
ブロッキング性が強く、また前記シ−トより得た容器は
積み重ねておくと使用時に剥離し難い欠点を有してい
る。また、ポリスチレン系樹脂は実用強度に劣るという
問題点がある。2. Description of the Related Art A biaxially stretched polystyrene resin sheet
Grape is widely used in the food packaging field because of its transparency and elasticity. However, this biaxially stretched sheet has a strong blocking property, and when the containers obtained from the sheet are stacked, they are difficult to peel off during use. In addition, the polystyrene resin has a problem that it is inferior in practical strength.
【０００３】この欠点を改良するための方法としては、
ポリスチレン系樹脂にゴムを添加してシ−トを２軸延伸
した際に、前記ゴムをシ−ト表面に突出させてシ−トの
剥離を良好とすること（特開昭５０−７４６４９号公
報）および前記シ−ト表面にシリコンオイルを塗布する
こと（特開昭５２−８０８０号公報）が提案されてい
る。 しかしながら、ゴム添加樹脂は、２軸延伸すると
ゴムが偏平となるためシ−ト表面への突出される割合が
一定となり難く、シ−トの剥離をよくするためにはゴム
量を多く添加する必要から透明性の低下を招く恐れを生
じたり、またゴムを多く用いると長期運転中およびリサ
イクル品を添加することによるヤケからくる異物を生
じ、シ−ト外観不良およびシ−ト破断の原因となる欠点
がある。As a method for remedying this drawback,
When rubber is added to polystyrene-based resin and the sheet is biaxially stretched, the rubber is projected on the surface of the sheet to improve the peeling of the sheet (Japanese Patent Laid-Open No. 50-74649). ) And coating the surface of the sheet with silicone oil (Japanese Patent Laid-Open No. 52-8080). However, in the rubber-added resin, when biaxially stretched, the rubber becomes flat, so that the ratio of protrusion to the surface of the sheet is difficult to be constant, and it is necessary to add a large amount of rubber to improve the peeling of the sheet. May cause a decrease in transparency, and if a large amount of rubber is used, foreign matter may be generated from burns during long-term operation and addition of recycled products, which may lead to defective sheet appearance and sheet breakage. There are drawbacks.
【０００４】さらにゴム量を減少させ、ゴムの粒子径を
大きくする例えば６〜１０μｍ程度とすることもできる
がこの方法では２軸延伸シ−トの表面の肌荒れや光沢低
下が生じる。The amount of rubber can be further reduced and the particle size of the rubber can be increased, for example, about 6 to 10 μm, but this method causes roughening of the surface of the biaxially stretched sheet and deterioration of gloss.
【０００５】また、これとは別にポリスチレン系樹脂に
合成二酸化硅素を添加してシ−トを２軸延伸した際に前
記二酸化硅素をシ−ト表面に突出させてシ−トの剥離を
良好とすること（特公平６−８５６公報）およびさら
に、スチレングラフトゴムを添加すること（特公平６−
８５５公報）が提案されている。Separately from this, when the synthetic silicon dioxide is added to the polystyrene resin and the sheet is biaxially stretched, the silicon dioxide is projected onto the surface of the sheet, and the peeling of the sheet is improved. (Japanese Patent Publication No. 6-856) and addition of styrene graft rubber (Japanese Patent Publication No. 6-856).
855) has been proposed.
【０００６】これらの系において、二酸化硅素の屈折率
が１．３〜１．４５で、母体であるポリスチレン系樹脂
の屈折率が１．５５〜１．５９と屈折率に差があり、透
明性および光沢低下が生じる。また、ポリスチレン系樹
脂と二酸化硅素との間での界面ぬれが悪いためその部分
で二酸化硅素が脱落し、さらにシ−ト物性が低下し、実
用上使用することができない。In these systems, the refractive index of silicon dioxide is 1.3 to 1.45, and the refractive index of the matrix polystyrene resin is 1.55 to 1.59. And a decrease in gloss occurs. Further, since the interface wetting between the polystyrene resin and the silicon dioxide is poor, the silicon dioxide falls off at that portion, and the sheet physical properties are further deteriorated, which makes it practically unusable.
【０００７】また、従来のスチレン系樹脂２軸延伸シー
トは腰がある反面、容易に指で引裂けが起こりデュポン
衝撃強度などの面衝撃に対して弱いという欠点があっ
た。Further, the conventional biaxially stretched styrene resin sheet has a drawback that it is liable to tear due to fingers because it is stiff and weak against surface impact such as DuPont impact strength.
【０００８】[0008]
【発明が解決しようとする課題】本発明は、かかる欠点
を解決するためポリスチレン系樹脂と屈折率の類似した
スチレン系架橋微粒子との樹脂組成物を２軸延伸するこ
とにより、該微粒子は延伸時に偏平に引伸ばされない為
スチレン系樹脂シ−ト表面に微細な凹凸を均一に生じさ
せてシリコ−ンオイル塗布性能を向上させ、従来の熱劣
化によるゴムのヤケおよび二酸化硅素添加に起因する外
観不良を改善させ、かつ、面衝撃強度、およびシートの
腰を改良し、透明性を低下させることなく、さらに延伸
シート同志のブロッキング性を弱め、前記シ−トを多数
枚重ねて打抜いた成形品の剥離性を向上させたポリスチ
レン系樹脂２軸延伸シ−トを完成するに至った。In order to solve such a drawback, the present invention biaxially stretches a resin composition of a polystyrene resin and styrene crosslinked fine particles having a similar refractive index, whereby the fine particles are stretched at the time of stretching. Since it is not flatly stretched, fine irregularities are uniformly generated on the surface of the styrene resin sheet to improve the silicone oil application performance, and the appearance of the rubber due to conventional heat deterioration and the poor appearance due to the addition of silicon dioxide are caused. Improved, the surface impact strength, and the sheet stiffness, without lowering the transparency, further weakening the blocking properties of the stretched sheets, and punching a plurality of the sheets by punching. We have completed a biaxially stretched polystyrene resin sheet with improved releasability.
【０００９】[0009]
【課題を解決するための手段】すなわち本発明の課題
は、平均粒子径０．１〜３μｍのスチレングラトジエン
ゴムをゴム濃度で６０〜６００ｐｐｍ含有した透明なポ
リスチレン系樹脂中に平均粒子径１〜１０μｍのスチレ
ン系架橋微粒子１００〜１０００ｐｐｍと平均粒子径が
０．００１〜０．５μｍである無機充填剤を１００〜３
００００ｐｐｍ含有させた樹脂組成物を２軸延伸してな
るポリスチレン系樹脂シートによって、容易に解決する
ことができる。That is, the object of the present invention is to provide a transparent polystyrene resin containing 60 to 600 ppm of styrene-gradodiene rubber having an average particle diameter of 0.1 to 3 μm in terms of rubber concentration. 100 to 1000 ppm of styrene-based crosslinked fine particles of 10 to 10 μm and 100 to 3 of inorganic filler having an average particle size of 0.001 to 0.5 μm.
This can be easily solved by using a polystyrene resin sheet obtained by biaxially stretching a resin composition containing 0000 ppm.
【００１０】[0010]
【発明の実施の形態】本発明に用いる透明なスチレン系
樹脂のスチレン単量体としては例えば、スチレン、アラ
ルキルスチレン（例えばｏ−、ｍ−およびｐ−メチルス
チレン、ｐ−エチルスチレン、ｐ−イソプロピルスチレ
ン、ブチルスチレン、ｐ−第３級ブチルスチレン）、種
種のアルファアルキルスチレン（例えばメチルスチレ
ン、エチルスチレン）、種種のアルハロスチレン（例え
ばｏ−，ｍ−およびｐ−クロロスチレン、ブロモスチレ
ン、フルオロスチレン）、種種のジ、トリ、テトラおよ
びペンタ置換クロロスチレン、ブロモスチレンおよびフ
ルオロスチレンおよび種種のアルファおよびベータ−ハ
ロ置換スチレン（例えばアルファクロロスチレン、アル
ファブロモスチレン、ベータクロロスチレンおよびベー
タブロモスチレン）、および前記単量体と共重合が可能
な例えばアクリロニトリル、メチルメタアクリート、無
水マレイン酸等との共重合体があげられる。また前記透
明なポリスチレン系樹脂の製法は、通常の重合方法であ
れば、何ら制限がない。BEST MODE FOR CARRYING OUT THE INVENTION Examples of the styrene monomer of the transparent styrenic resin used in the present invention include styrene, aralkyl styrene (for example, o-, m- and p-methylstyrene, p-ethylstyrene, p-isopropyl). Styrene, butyl styrene, p-tertiary butyl styrene), various alpha alkyl styrenes (eg methyl styrene, ethyl styrene), various arhalo styrenes (eg o-, m- and p-chloro styrene, bromo styrene, fluoro). Styrene), some di-, tri-, tetra- and penta-substituted chlorostyrenes, bromostyrenes and fluorostyrenes and some alpha and beta-halo substituted styrenes (eg alphachlorostyrene, alphabromostyrene, betachlorostyrene and betabromostyrene). And the monomer copolymerizable capable example acrylonitrile, methyl methacrylate A cleat, copolymers of maleic anhydride and the like. The method for producing the transparent polystyrene resin is not limited as long as it is a usual polymerization method.
【００１１】また、スチレングラフトジエンゴムのジエ
ンゴム成分としては、共役１，３−ジエン例えばブタジ
エン、イソプレン、２−クロロ−１，３ブタジエン、１
−クロロ−１，３ブタジエン、ピペリンなどの任意のゴ
ム重合体１種またはそれ以上の混合物より任意に選ばれ
る。As the diene rubber component of the styrene grafted diene rubber, conjugated 1,3-dienes such as butadiene, isoprene, 2-chloro-1,3 butadiene, 1
-Chloro-1,3 butadiene, any rubber polymer such as piperine, etc., optionally selected from a mixture of one or more rubber polymers.
【００１２】本発明のスチレングラフトゴム含有のポリ
スチレン系樹脂の製法は特に制限されるものでは無く、
例えばスチレン単量体にジエンゴムを溶解してなる方
法、および、ジエンゴム量を２〜１０重量％含有したグ
ラフト型ゴム変成ポリスチレン樹脂と透明なポリスチレ
ン樹脂とを、任意に混合して得る方法のいずれでも良
い。 さらに、本発明に用いるスチレングラフトジエン
ゴムの平均粒子径は０．１〜３μｍであり、好ましくは
０．５〜２．５μｍである。０．１μｍ未満ではシート
を２軸延伸した際、シート表面に突出するゴムの突起が
小さすぎてシートのブロッキング性を弱めるのに十分で
はなく、しかも前記シートを重ねて打ち抜いた成形品の
剥離性に劣り、また、３μｍを越えると、シート表面の
肌荒れ、透明性の低下を生じて好ましくない。The method for producing the polystyrene resin containing the styrene graft rubber of the present invention is not particularly limited,
For example, any of a method in which a diene rubber is dissolved in a styrene monomer and a method in which a graft-type rubber-modified polystyrene resin containing 2 to 10% by weight of a diene rubber and a transparent polystyrene resin are arbitrarily mixed are obtained. good. Further, the styrene-grafted diene rubber used in the present invention has an average particle size of 0.1 to 3 μm, preferably 0.5 to 2.5 μm. If the thickness is less than 0.1 μm, when the sheet is biaxially stretched, the rubber projections protruding on the surface of the sheet are too small to weaken the blocking property of the sheet, and the peelability of the molded product obtained by stacking the sheets and punching them out. If it exceeds 3 μm, the surface of the sheet becomes rough and the transparency is lowered, which is not preferable.
【００１３】また、透明なポリスチレン中のゴム濃度は
６０〜６００ｐｐｍであり、好ましくは１００〜４００
ｐｐｍである。６０ｐｐｍ未満では、シートへのシリコ
ンオイル塗布が不均一となり、しかもスチレン系架橋微
粒子の添加量を増大させる必要から凝集体が増してシー
ト表面が荒れ、６００ｐｐｍを越えると透明性が低下す
るので好ましくない。The rubber concentration in the transparent polystyrene is 60 to 600 ppm, preferably 100 to 400.
ppm. If it is less than 60 ppm, the application of silicone oil to the sheet becomes non-uniform, and since the amount of styrene-based crosslinked fine particles needs to be increased, aggregates increase and the surface of the sheet becomes rough, and if it exceeds 600 ppm, the transparency decreases, which is not preferable. .
【００１４】次に本発明で用いるスチレン系架橋微粒子
としてはポリスチレン系樹脂の屈折率に近い屈折率を有
する有機系微粒子が好ましい。また、その平均粒子径
は、１〜１０μｍであり、好ましくは１〜６μｍであ
る。１μｍ未満ではシ−トに再凝集による分散不良が生
じたり、フィッシュアイができてシ−ト表面外観不良を
起こし、また１０μｍを越えると、粗大粒子が多く含ま
れるのでシ−ト表面外観が損なわれたり、延伸時にシ−
ト破断を生じるので好ましくない。Next, as the styrene-based crosslinked fine particles used in the present invention, organic fine particles having a refractive index close to that of polystyrene resin are preferable. The average particle diameter is 1 to 10 μm, preferably 1 to 6 μm. If it is less than 1 μm, the sheet may be poorly dispersed due to re-aggregation, or fish eyes may be formed to cause a poor surface appearance of the sheet. If it is more than 10 μm, a large amount of coarse particles are contained, so that the surface appearance of the sheet is impaired. Or stretched when stretched
It is not preferable because it causes rupture.
【００１５】さらに樹脂中に含有される割合は１００〜
１０００ｐｐｍであり、好ましくは１００〜６００ｐｐ
ｍである。１００ｐｐｍ未満では、シート表面への突出
割合が少なく、シートブロッキング性を強くしたり、該
シートから得た成形品の積み重ねによる剥離性が劣り、
また１０００ｐｐｍを越えると、スチレン系架橋微粒子
の再凝集を起こす機会が多くなり、シ−トの透明性およ
び外観の低下、延伸時のシ−ト破断を生じる欠点があ
る。Further, the proportion of the resin contained is 100 to 100.
1000 ppm, preferably 100-600 pp
m. If it is less than 100 ppm, the protrusion ratio to the sheet surface is small, the sheet blocking property is strengthened, and the peelability due to the stacking of the molded articles obtained from the sheet is poor,
On the other hand, if it exceeds 1000 ppm, the chances of reaggregation of the styrene-based crosslinked fine particles increase, and the transparency and appearance of the sheet deteriorate, and the sheet breaks during stretching.
【００１６】本発明の無機充填剤としては、炭酸カルシ
ュウム、硫酸バリュウム、酸化亜鉛、水酸化マグネシュ
ウム、酸化マグネシュウム、酸化チタン、クレー、シリ
カなどが例示できる。さらに、樹脂組成物の透明性、耐
衝撃性が良好であることから、炭酸カルシュウム、硫酸
バリュウム、酸化亜鉛の中から選ばれる少なくとも一種
が好ましい。Examples of the inorganic filler of the present invention include calcium carbonate, barium sulfate, zinc oxide, magnesium hydroxide, magnesium oxide, titanium oxide, clay and silica. Furthermore, at least one selected from calcium carbonate, barium sulfate, and zinc oxide is preferable because the transparency and impact resistance of the resin composition are good.
【００１７】無機充填剤の平均粒子径は０．００１〜
０．５μｍ、好ましくは０．００１〜０．１μｍであ
る。平均粒子径が０．００１μｍ未満であると、分散性
が非常に悪く、樹脂中に均一に分散させることができな
い。０．５μｍを越えると、その添加量がごく少量でも
シートの透明性が劣る。The average particle size of the inorganic filler is 0.001 to
The thickness is 0.5 μm, preferably 0.001 to 0.1 μm. If the average particle size is less than 0.001 μm, the dispersibility is very poor and the particles cannot be uniformly dispersed in the resin. If it exceeds 0.5 μm, the transparency of the sheet will be poor even if the added amount is very small.
【００１８】無機充填剤の添加量は１００〜３００００
ｐｐｍ、好ましくは１００〜２００００ｐｐｍである。
添加量が１００ｐｐｍ未満であると衝撃強度の改良効果
が得られず、３００００ｐｐｍを越えると、透明性が大
きく損なわれる。The amount of the inorganic filler added is 100 to 30,000.
ppm, preferably 100 to 20000 ppm.
If the addition amount is less than 100 ppm, the effect of improving the impact strength cannot be obtained, and if it exceeds 30,000 ppm, the transparency is greatly impaired.
【００１９】また本発明の樹脂組成物は必要に応じて、
滑剤、可塑剤、着色剤等の添加剤を用いることができ
る。The resin composition of the present invention, if necessary,
Additives such as lubricants, plasticizers and colorants can be used.
【００２０】本発明の延伸シ−ト用としての樹脂組成物
は、透明なスチレン系樹脂とスチレン系架橋微粒子およ
び無機充填剤とをヘンシエルミキサ−、Ｖブレンダ−等
でドライブレンドしてもよく、また、有機系微粒子と無
機充填剤とを多量に含んだ樹脂組成物のマスタ−ペレッ
トを作り、透明なスチレン系樹脂と混合する方法等いず
れの方法でもよい。The resin composition for stretch sheet of the present invention may be dry blended with a transparent styrene resin, styrene crosslinked fine particles and an inorganic filler by a Henschel mixer, a V blender or the like. Further, any method such as a method of preparing a master pellet of a resin composition containing a large amount of organic fine particles and an inorganic filler and mixing it with a transparent styrene resin may be used.
【００２１】また本発明のポリスチレン系樹脂延伸シ−
トはその表面にオストワルド粘度（２０℃）が１００〜
２００，０００センチスト−クスのジメチルシリコ−ン
を主成分とするシリコ−ンオイル単独および乳化剤を含
有したエマルジョンを単独または、防曇剤、帯電防止剤
と併用して均一に塗布することができる。また、シリコ
−ンオイルの塗布量は、手にべたつきが感じられない程
度１０〜１５０ｍｇ／ｍ２の範囲である。Further, the polystyrene resin stretch sheet of the present invention is used.
Has an Ostwald viscosity (20 ° C) of 100-
The silicone oil containing 200,000 centistokes of dimethyl silicone as a main component and an emulsion containing an emulsifier can be uniformly applied alone or in combination with an antifogging agent and an antistatic agent. The amount of silicone oil applied is in the range of 10 to 150 mg / m 2 to the extent that no stickiness is felt on the hand.
【００２２】さらに、上記２軸延伸ポリスチレン系樹脂
シートの２軸延伸温度は１１０〜１４０℃好ましくは、
１２０〜１３０℃、２軸延伸倍率は縦２〜４倍、横２〜
４倍、好ましくは、縦横、それぞれで２．５倍で二軸延
伸する。Further, the biaxial stretching temperature of the biaxially stretched polystyrene resin sheet is 110 to 140 ° C., preferably
120 to 130 ° C., biaxial draw ratio is 2 to 4 times in length, 2 to in width
It is biaxially stretched 4 times, preferably 2.5 times in the length and width directions.
【００２３】本発明で用いたグラフトゴム、スチレン系
架橋微粒子および無機充填剤微粒子の平均粒子径（Ｄ）
とは超薄切片法を用いて組成物の透過型顕微鏡写真を撮
影し、粒子１０００個の円換算粒子径を測定して次式を
用いて算出した値である。ゴム粒子径は式（Ｉ）によ
り、スチレン系架橋微粒子および無機充填剤微粒子の粒
子径は式（ＩＩ）により計算されるものとする。Average particle diameter (D) of the graft rubber, styrene-based crosslinked fine particles and inorganic filler fine particles used in the present invention
Is a value calculated by using the following formula by taking a transmission electron micrograph of the composition using the ultrathin section method, measuring the circle-converted particle diameter of 1000 particles. The rubber particle diameter is calculated by the formula (I), and the particle diameters of the styrene-based crosslinked fine particles and the inorganic filler fine particles are calculated by the formula (II).
【００２４】[0024]
【数１】 [Equation 1]
【数２】 [Equation 2]
【００２５】[0025]
【実施例】以下実施例により本発明を詳細に説明する。
なお、スチレン系架橋微粒子の平均粒子径の測定方法
は、コ−ルタ−カウンタ−法による５０％体積平均粒子
径であり、また、無機微粒子の平均粒子径は電子顕微鏡
写真から求めた。表１に示す特性評価方法は次のとおり
である。 １．剥離性：シ−ト単発圧空成形機（浅野製鉄所）にか
け容器（開口部９０×底部６０×５０ｍｍ深さ）に成形
しそれを２０枚重ねて抜型カッタ−で圧切し、積み重ね
られている成型品の上に２ｋｇの荷重を乗せた時の高さ
を［Ａ］とし、荷重を取り除いた時の高さを［Ｂ］とし
て回復率を次式のように計算した。The present invention will be described in detail with reference to the following examples.
The method for measuring the average particle size of the styrene-based crosslinked fine particles was a 50% volume average particle size by the Coulter Counter method, and the average particle size of the inorganic fine particles was determined from an electron micrograph. The characteristic evaluation methods shown in Table 1 are as follows. 1. Peelability: A single-shot pressure air molding machine (Asano Steel Works) is used to mold into a container (opening 90 x bottom 60 x 50 mm depth), 20 sheets of which are stacked and pressed by a die cutter to be stacked. The height when a load of 2 kg was placed on the product was [A], and the height when the load was removed was [B], and the recovery rate was calculated by the following equation.
【数３】 ◎：３０％以上 ○：２０％以上〜３０％未満 △：１０％以上〜２０％未満 ×：１０％未満 ２．透明性：スガ試験機・ヘ−ズ測定器でシ−ト厚１８
０μｍ基準でヘ−ズを測定した。 ◎（良好） ： １％以下 ○（良） ： １超 〜１．５％ △（やや良）： １．５〜２．０％ ×（不良） ： ２％超 ３．シリコンオイルマ−ク：Ａ４版シ−トを１０枚重ね
合わせ１０Ｋｇの荷重を１２時間かける。その後Ａ４版
シ−トを１００区画に分け地図模様の面積がＡ４版にし
める度合を目視により測定した。 ◎（良好） ：５％以下 ○（良） ：５超〜２５％ △（やや良）：２５超〜５０％ ×（不良） ：５０％超 ４．デュポン衝撃強度（ｋｇｆｃｍ） ＪＩＳＫ５４００に準拠した。 （実施例１〜４）スチレングラフトゴムのゴム濃度およ
び平均粒子径が表１に示すとうりになるように透明なポ
リスチレン系樹脂とグラフト型ゴム変性ポリスチレン系
樹脂（ゴム濃度６重量％）とを混合し、さらに該混合樹
脂中に表１に示す通りの量、平均粒子系のポリスチレン
架橋粒子、無機充填剤粒子を混入した樹脂組成物を押出
機からシート状に押し出し、タテおよびヨコに２．５倍
延伸して１８０μｍの２軸延伸シートを得た。次に前記
延伸シートの表面にシリコーンオイルを４０ｍｇ／ｍ２
となるように塗布した。得られたシートの特性を表１に
示す。(Equation 3) ◎: 30% or more ○: 20% or more and less than 30% △: 10% or more and less than 20% ×: less than 10% 2. Transparency: Sheet thickness 18 with Suga tester and haze measuring device
The haze was measured on the basis of 0 μm. ⊚ (Good): 1% or less ○ (Good): Greater than 1 to 1.5% △ (Slightly good): 1.5 to 2.0% × (Poor): Greater than 2% 3. Silicone oil mark: 10 sheets of A4 size sheets are stacked and a load of 10 kg is applied for 12 hours. Thereafter, the A4 size sheet was divided into 100 sections, and the extent to which the area of the map pattern fits into the A4 size sheet was visually measured. ⊚ (good): 5% or less ○ (good): more than 5 to 25% △ (somewhat good): more than 25 to 50% × (poor): more than 50% 4. DuPont impact strength (kgfcm) Based on JISK5400. (Examples 1 to 4) A transparent polystyrene-based resin and a graft-type rubber-modified polystyrene-based resin (rubber concentration 6% by weight) were used so that the rubber concentration and the average particle size of the styrene-grafted rubber are as shown in Table 1. 1. A resin composition obtained by mixing and mixing the amount of polystyrene crosslinked particles having an average particle size and the inorganic filler particles as shown in Table 1 in the mixed resin is extruded into a sheet form from an extruder, and vertically and horizontally 2. The film was stretched 5 times to obtain a 180 μm biaxially stretched sheet. Then, apply 40 mg / m2 of silicone oil to the surface of the stretched sheet.
It applied so that it might become. The properties of the obtained sheet are shown in Table 1.
【００２６】（比較例１〜６）スチレングラフトゴムの
ゴム濃度および平均粒子径、さらにポリスチレン系架橋
粒子、無機微粒子の量、平均粒子径を表に示すとうりに
した以外は実施例１と同様に操作した。Comparative Examples 1 to 6 Same as Example 1 except that the rubber concentration and average particle size of styrene-grafted rubber, polystyrene crosslinked particles, amount of inorganic fine particles and average particle size are shown in the table. Operated.
【００２７】[0027]
【表１】 [Table 1]
【００２８】[0028]
【発明の効果】本発明のポリスチレン２軸延伸シートは
シート表面に微細な凹凸が均一にできるのでシリコンオ
イル塗布が均一となり、しかも透明性を維持し延伸シー
トどうしのブロッキング性を弱め、かつ成型品の積み重
ねによる剥離性が良好、かつ、衝撃強度が大きいという
特徴を有する。EFFECTS OF THE INVENTION The polystyrene biaxially stretched sheet of the present invention can make fine irregularities even on the surface of the sheet, so that the silicone oil can be evenly applied, the transparency is maintained, the blocking property between stretched sheets is weakened, and a molded product is obtained. It is characterized in that it has good peeling property due to stacking, and has high impact strength.
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 Ｂ２９Ｌ 7:00 ──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. 6 Identification code Agency reference number FI Technical display location B29L 7:00
Claims (2)
０．１〜３μｍのスチレングラフトジエンゴムをゴム濃
度で６０〜６００ｐｐｍ、および、平均粒子径１〜１０
μｍのスチレン系架橋微粒子を１００〜１０００ｐｐ
ｍ、および、平均粒子径が０．００１〜０．５μｍであ
る無機充填剤を１００〜３００００ｐｐｍ含有させた樹
脂組成物を延伸してなることを特徴とする２軸延伸ポリ
スチレン系樹脂シート。1. A styrene-grafted diene rubber having an average particle diameter of 0.1 to 3 μm in a transparent polystyrene resin in a rubber concentration of 60 to 600 ppm, and an average particle diameter of 1 to 10.
100-1000pp of styrene-based crosslinked fine particles of μm
m, and a biaxially stretched polystyrene-based resin sheet obtained by stretching a resin composition containing 100 to 30,000 ppm of an inorganic filler having an average particle diameter of 0.001 to 0.5 μm.
ュウム、酸化亜鉛の中から選ばれる少なくとも一種であ
る請求項１記載の２軸延伸ポリスチレン系樹脂シート。2. The biaxially stretched polystyrene resin sheet according to claim 1, wherein the inorganic filler is at least one selected from calcium carbonate, barium sulfate, and zinc oxide.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1634796A JPH09208717A (en) | 1996-02-01 | 1996-02-01 | Biaxially oriented polystyrene-based resin sheet |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1634796A JPH09208717A (en) | 1996-02-01 | 1996-02-01 | Biaxially oriented polystyrene-based resin sheet |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09208717A true JPH09208717A (en) | 1997-08-12 |
Family
ID=11913851
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1634796A Pending JPH09208717A (en) | 1996-02-01 | 1996-02-01 | Biaxially oriented polystyrene-based resin sheet |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09208717A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002062876A3 (en) * | 2001-02-02 | 2003-06-12 | Dow Global Technologies Inc | Low-gloss biaxially oriented films comprising vinyl aromatic polymers and substantially non-spherical rubber particles |
| JP2004315802A (en) * | 2003-04-04 | 2004-11-11 | Daicel Polymer Ltd | Anti-fogging sheet and container by using the same |
-
1996
- 1996-02-01 JP JP1634796A patent/JPH09208717A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2002062876A3 (en) * | 2001-02-02 | 2003-06-12 | Dow Global Technologies Inc | Low-gloss biaxially oriented films comprising vinyl aromatic polymers and substantially non-spherical rubber particles |
| US6579946B2 (en) | 2001-02-02 | 2003-06-17 | Dow Global Technologies Inc. | Low-gloss biaxially oriented films comprising vinyl aromatic polymers and substantially non-spherical rubber particles |
| JP2004315802A (en) * | 2003-04-04 | 2004-11-11 | Daicel Polymer Ltd | Anti-fogging sheet and container by using the same |
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