JPH0791427B2 - Polystyrene resin composition - Google Patents
Polystyrene resin compositionInfo
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- JPH0791427B2 JPH0791427B2 JP26262887A JP26262887A JPH0791427B2 JP H0791427 B2 JPH0791427 B2 JP H0791427B2 JP 26262887 A JP26262887 A JP 26262887A JP 26262887 A JP26262887 A JP 26262887A JP H0791427 B2 JPH0791427 B2 JP H0791427B2
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Description
【発明の詳細な説明】 〔産業上の利用分野〕 本発明はポリスチレン系樹脂組成物に関し、詳しくはシ
ンジオタクチック構造を有するスチレン系重合体に特定
の粒子径の結晶核剤を配合してなる成形性にすぐれたポ
リスチレン系樹脂組成物に関する。TECHNICAL FIELD The present invention relates to a polystyrene resin composition, more specifically, a styrene polymer having a syndiotactic structure and a crystal nucleating agent having a specific particle diameter. The present invention relates to a polystyrene resin composition having excellent moldability.
近年、シンジオタクチック構造を有するスチレン系重合
体が開発されたが、このスチレン系重合体は耐熱性，耐
溶剤性，機械的強度にすぐれたものであるが、低温下に
おける結晶化速度が遅いため、成形時に高温金型を使用
しても、成形サイクルが長く、バリが出やすいという成
形性に関する難点を有している。Recently, a styrene-based polymer having a syndiotactic structure has been developed. The styrene-based polymer has excellent heat resistance, solvent resistance, and mechanical strength, but has a low crystallization rate at low temperatures. Therefore, even if a high temperature mold is used during molding, the molding cycle is long and burrs are likely to be formed, which is a problem regarding moldability.
そこで、本発明者らはシンジオタクチック構造を有する
スチレン系重合体の上述した欠点を克服し、各種成形性
の改善された実用的価値の高い樹脂組成物を開発すべく
鋭意研究を重ねた。Therefore, the inventors of the present invention have conducted extensive studies to overcome the above-mentioned drawbacks of the styrene-based polymer having a syndiotactic structure and develop a resin composition having various practical moldability and high practical value.
その結果、シンジオタクチック構造を有するスチレン系
重合体に、平均粒子径50μｍ以下の無機化合物を一定割
合で配合することにより、上記課題を解決しうることを
見出した。本発明はかかる知見に基づいて完成したもの
である。As a result, they have found that the above problems can be solved by blending a styrene-based polymer having a syndiotactic structure with an inorganic compound having an average particle diameter of 50 μm or less at a fixed ratio. The present invention has been completed based on such findings.
すなわち本発明は、（Ａ）主としてシンジオタクチック
構造を有するスチレン系重合体100重量部および（Ｂ）
平均粒子径50μｍ以下の無機化合物0.01〜10重量部を主
成分とするポリスチレン系樹脂組成物を提供するもので
ある。That is, the present invention relates to (A) 100 parts by weight of a styrene polymer mainly having a syndiotactic structure and (B)
A polystyrene resin composition containing 0.01 to 10 parts by weight of an inorganic compound having an average particle diameter of 50 μm or less as a main component.
本発明の樹脂組成物は、上記の如く（Ａ），（Ｂ）成分
を主成分とするものであるが、ここで（Ａ）成分である
主としてシンジオタクチック構造を有するスチレン系重
合体とは、核磁気共鳴法（NMR法）により定量されるタ
クティシティーが、ダイアッドで85％以上もしくはペン
タッドで50％以上のシンジオタクティシティーを有する
ものを意味する。このようなスチレン系重合体の具体例
をあげれば、ポリスチレンをはじめ、ポリ（メチルスチ
レン），ポリ（ジメチルスチレン），ポリ（ｔ−ブチル
スチレン）などのポリ（アルキルスチレン）、ポリ（ク
ロロスチレン），ポリ（ブロモスチレン），ポリ（フル
オロスチレン），ポリ（ｏ−メチル−ｐ−フルオロスチ
レン）などのポリ（ハロゲン化スチレン）、ポリ（クロ
ロメチルスチレン）などのポリ（ハロゲン置換アルキル
スチレン）、ポリ（メトキシスチレン）、ポリ（エトキ
シスチレン）などのポリ（アルコキシスチレン）、ポリ
（カルボキシメチルスチレン）などのポリ（カルボキシ
エステルスチレン）、ポリ（ビニルベンジルプロピルエ
ーテル）などのポリ（アルキルエーテルスチレン）、ポ
リ（トリメチルシリルスチレン）などのポリ（アルキル
シリルスチレン）、ポリ（ビニルベンゼンスルホン酸エ
チル）、ポリ（ビニルベンジルメトキシホスファイド）
などがあげられ、またこれらの混合物、さらにはこれら
を主成分とする共重合体などがある。The resin composition of the present invention is mainly composed of the components (A) and (B) as described above. Here, the component (A), a styrene-based polymer mainly having a syndiotactic structure, is The tacticity determined by the nuclear magnetic resonance method (NMR method) has a syndiotacticity of 85% or more for diads or 50% or more for pentads. Specific examples of such styrene-based polymers include polystyrene, poly (methylstyrene), poly (dimethylstyrene), poly (t-butylstyrene), and other poly (alkylstyrenes), poly (chlorostyrene). , Poly (bromostyrene), poly (fluorostyrene), poly (o-methyl-p-fluorostyrene) and other poly (halogenated styrene), poly (chloromethylstyrene) and other poly (halogen-substituted alkylstyrene), poly Poly (alkoxystyrene) such as (methoxystyrene), poly (ethoxystyrene), poly (carboxyester styrene) such as poly (carboxymethylstyrene), poly (alkyl ether styrene) such as poly (vinylbenzylpropyl ether), poly (Trimethylsilylstyrene) Poly (alkyl silyl styrene) of poly (ethyl vinyl benzene sulfonate), poly (vinylbenzyl methoxyphosphonic sulfide)
And the like, and mixtures thereof, and copolymers containing these as the main components.
このように本発明における主としてシンジオタクチック
構造を有するスチレン系重合体とは、上述の如く必ずし
もそれが単一化合物である必要はない。シンジオタクテ
ィシティーが、上記範囲に存する限り、アイソタクチッ
クもしくはアタクチック構造のスチレン系重合体との混
合物や共重合体鎖中に組み込まれたものであってもよ
い。また、このスチレン系重合体は、分子量の異なるも
のの混合物であってもよく、重合度は少なくとも５以
上、好ましくは10以上のものである。As described above, the styrene-based polymer mainly having a syndiotactic structure in the present invention is not necessarily a single compound as described above. As long as the syndiotacticity is within the above range, it may be a mixture with a styrene-based polymer having an isotactic or atactic structure, or one incorporated into a copolymer chain. The styrene-based polymer may be a mixture of those having different molecular weights, and the degree of polymerization is at least 5 or more, preferably 10 or more.
上記（Ａ）主としてシンジオタクチック構造を有するス
チレン系重合体は、各種の方法により製造することがで
きるが、好ましくは特開昭62−187708号公報に記載され
た方法をあげることができる。The above-mentioned (A) styrene-based polymer mainly having a syndiotactic structure can be produced by various methods, preferably the method described in JP-A-62-187708.
次に、本発明の樹脂組成物の（Ｂ）成分は、無機化合物
であるが、その平均粒子径は50μｍ以下、好ましくは10
〜0.1μｍである。平均粒子径は50μｍを越えるもので
は、スチレン系重合体の結晶化速度を向上させる効果が
得られない。また、この無機化合物の配合量は、前記
（Ａ）成分100重量部に対して0.01〜10重量部、好まし
くは0.05〜５重量部、更に好ましくは0.1〜２重量部で
ある。ここで、（Ｂ）成分である無機化合物の配合量
が、0.01重量部未満では、得られる組成物の成形性の改
善効果はほとんど見られず、一方、10重量部を越える量
を配合しても、結晶化速度をさらに向上することはでき
ず、配合量の増加に伴ってスチレン系樹脂本来の性質が
次第に失われることになる。Next, the component (B) of the resin composition of the present invention is an inorganic compound, but its average particle size is 50 μm or less, preferably 10 μm or less.
Is about 0.1 μm. If the average particle size exceeds 50 μm, the effect of improving the crystallization rate of the styrene polymer cannot be obtained. The amount of the inorganic compound added is 0.01 to 10 parts by weight, preferably 0.05 to 5 parts by weight, and more preferably 0.1 to 2 parts by weight, based on 100 parts by weight of the component (A). Here, if the amount of the inorganic compound as the component (B) is less than 0.01 parts by weight, almost no effect of improving the moldability of the obtained composition is observed, while if the amount exceeds 10 parts by weight. However, the crystallization rate cannot be further improved, and the original properties of the styrene resin will gradually be lost as the blending amount increases.
このような（Ｂ）成分である無機化合物は、（Ａ）成分
であるスチレン系重合体の結晶化を促す結晶核剤のごと
き作用を呈するものであり、その種類は特に制限はない
が、好適な具体例としては、カーボンブラック、グラフ
ァイト、二酸化チタン，シリカ，タルク，マイカ，アス
ベスト，亜鉛華，クレー，炭酸カルシウム，硫酸カルシ
ウム，炭酸バリウム，硫酸バリウム，炭酸マグネシウ
ム，酸化スズ，酸化アンチモン，石英，ドロマイト，ア
ルミナおよびカオリンをあげることができ、これらを単
独であるいは二種以上を混合して用いてもよい。これら
のうち、特にマイカ，二酸化チタン，シリカ，タルク，
炭酸カルシウム，アルミナ，クレーおよびカオリンを最
適なものとしてあげることができる。The inorganic compound as the component (B) acts as a crystal nucleating agent that promotes crystallization of the styrene-based polymer as the component (A), and the kind thereof is not particularly limited, but is preferable. Specific examples include carbon black, graphite, titanium dioxide, silica, talc, mica, asbestos, zinc white, clay, calcium carbonate, calcium sulfate, barium carbonate, barium sulfate, magnesium carbonate, tin oxide, antimony oxide, quartz, Dolomite, alumina, and kaolin may be used, and these may be used alone or in combination of two or more. Of these, mica, titanium dioxide, silica, talc,
Calcium carbonate, alumina, clay and kaolin can be mentioned as the optimum ones.
本発明の樹脂組成物は、上記（Ａ）成分および（Ｂ）成
分を主成分とするものであるが、さらに必要に応じて各
種の添加材、例えば酸化防止剤，繊維状強化材（ガラス
繊維，炭素繊維など）を適宜配合することもできる。The resin composition of the present invention contains the above-mentioned component (A) and component (B) as main components, and if necessary, various additives such as antioxidants and fibrous reinforcing materials (glass fiber). , Carbon fiber, etc.) can be appropriately mixed.
本発明の樹脂組成物は、上記（Ａ）成分および（Ｂ）成
分、さらに必要に応じて加える各種添加材を、ニーダ
ー，ミキシングロールあるいは押出機などにより混練す
ることによって得られる。The resin composition of the present invention can be obtained by kneading the above-mentioned components (A) and (B) and various additives which are added as necessary with a kneader, a mixing roll or an extruder.
次に、本発明を実施例および比較例により更に詳しく説
明する。Next, the present invention will be described in more detail with reference to Examples and Comparative Examples.
合成例１ 反応容器に、溶媒としてトルエン32と、触媒成分であ
るメチルアルミノキサンをアルミニウム原子として1335
ミリモル、およびテトラエトキシチタン13.4ミリモルを
加え、次いでこれにスチレン15kgを加えた。Synthesis Example 1 Toluene 32 as a solvent and methylaluminoxane as a catalyst component in an amount of 1335 as an aluminum atom were placed in a reaction vessel.
Millimoles, and tetraethoxy titanium 13.4 millimoles, and then 15 kg of styrene.
次いで、55℃に昇温して２時間重合反応を行った。反応
終了後、得られた生成物を水酸化ナトリウム−メタノー
ル混合溶液で洗浄し、触媒成分を分解除去した。次に、
これを乾燥して重合体2.1kgを得た。Then, the temperature was raised to 55 ° C. and a polymerization reaction was carried out for 2 hours. After completion of the reaction, the obtained product was washed with a sodium hydroxide-methanol mixed solution to decompose and remove the catalyst component. next,
This was dried to obtain 2.1 kg of a polymer.
更に、この重合体をメチレエチレケトンを溶媒としてソ
ックスレー抽出し、抽出残分95重量％を得た。このよう
にして得られた重合体は重合平均分子量が400,000であ
り、融点270℃であった。また、この重合体は同位体炭
素の核磁気共鳴（13C−NMR）による分析からシンジオタ
クチック構造に基因する145.35ppmに吸収が認められ、
そのピーク面積から算出したペンタッドでのシンジオタ
クティシティーは98％のものであった。Further, this polymer was subjected to Soxhlet extraction using methyleethylketone as a solvent to obtain an extraction residue of 95% by weight. The polymer thus obtained had a polymerization average molecular weight of 400,000 and a melting point of 270 ° C. Further, this polymer was found to have an absorption at 145.35 ppm due to the syndiotactic structure from the nuclear magnetic resonance ( 13 C-NMR) analysis of isotope carbon,
The syndiotacticity in the pentad calculated from the peak area was 98%.
合成例２ 重合反応温度を60℃としたほかは、合成例１と同様にし
て、重合平均分子量が350,000の重合体2.3kgを得た。こ
の重合体のペンタッドでのシンジオタクティシティーは
98％であった。Synthesis Example 2 2.3 kg of a polymer having a polymerization average molecular weight of 350,000 was obtained in the same manner as in Synthesis Example 1 except that the polymerization reaction temperature was 60 ° C. The syndiotacticity of this polymer in the pentad is
It was 98%.
実施例１ 合成例１で得た重量平均分子量400,000のシンジオタク
チックポリスチレン69重量部、平均粒子径0.5μｍのタ
ルク１重量部、長さ3mmのガラスチョップドストランド3
0重量部および酸化防止剤としてビス（2,4−ジ−ｔ−ブ
チルフェニル）ペンタエリスリトールジホスファイト0.
1重量部を回転式ブレンダーで混合した。Example 1 69 parts by weight of syndiotactic polystyrene having a weight average molecular weight of 400,000 obtained in Synthesis Example 1, 1 part by weight of talc having an average particle diameter of 0.5 μm, and glass chopped strand 3 having a length of 3 mm
0 parts by weight and bis (2,4-di-t-butylphenyl) pentaerythritol diphosphite as an antioxidant.
1 part by weight was mixed with a rotary blender.
次いで、内径30mmの二軸押出機のホッパーに投入し、バ
レル温度270℃−285℃−285℃で溶融混合後、ペレット
にした。得られたペレットを70℃で一昼夜乾燥後、バレ
ル温度265℃−275℃−280℃、金型温度100〜160℃、射
出圧力1600〜2000kg/cm2の条件で、直径90mm,厚さ10mm,
歯数25の歯車を成形した。Then, the mixture was put into a hopper of a twin-screw extruder having an inner diameter of 30 mm, melt-mixed at a barrel temperature of 270 ° C.-285 ° C.-285 ° C., and then pelletized. After drying the obtained pellets at 70 ° C for a whole day and night, barrel temperature 265 ° C-275 ° C-280 ° C, mold temperature 100-160 ° C, injection pressure 1600-2000kg / cm 2 conditions, diameter 90mm, thickness 10mm,
A gear with 25 teeth was molded.
得られた成形品の離型性を、連続10回の射出成形が可能
となる最小冷却時間により評価した。結果を第１表に示
す。The releasability of the obtained molded product was evaluated by the minimum cooling time that enables continuous injection molding 10 times. The results are shown in Table 1.
また、上述のペレットを用い、シリンダー温度280℃，
金型温度160℃にて射出成形を行い、曲げ試験片を得
た。得られた曲げ試験片を用いて、曲げ試験及び熱変形
温度の測定を行った。更に、得られた試験片の中心部を
削り取り、DSC（Differential Scanning Calorimeter）
測定により結晶化度を測定した。結果を第２表に示す。Also, using the above pellets, cylinder temperature 280 ℃,
Bending test pieces were obtained by injection molding at a mold temperature of 160 ° C. The bending test and the heat distortion temperature were measured using the obtained bending test piece. Further, the center part of the obtained test piece was scraped off, and DSC (Differential Scanning Calorimeter)
The crystallinity was measured by measurement. The results are shown in Table 2.
実施例２ 実施例１において、ガラスチョップドストランドの配合
量を30.8重量部とし、またタルクの配合量を0.2重量部
としたこと以外は、実施例１と同様にして成形品を得、
離型性の評価を行った。結果を第１表に示す。Example 2 A molded article was obtained in the same manner as in Example 1 except that the glass chopped strand content was 30.8 parts by weight and the talc content was 0.2 parts by weight.
The releasability was evaluated. The results are shown in Table 1.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
実施例３ 実施例１において、平均粒子径５μｍのタルクを用いた
こと以外は、実施例１と同様にして成形品を得、離型性
の評価を行った。結果を第１表に示す。Example 3 A molded article was obtained in the same manner as in Example 1 except that talc having an average particle diameter of 5 μm was used, and the releasability was evaluated. The results are shown in Table 1.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
実施例４ 実施例２において、平均粒子径５μｍのタルクを用いた
こと以外は、実施例２と同様にして成形品を得、離型性
の評価を行った。結果を第１表に示す。Example 4 A molded article was obtained in the same manner as in Example 2 except that talc having an average particle diameter of 5 μm was used, and the releasability was evaluated. The results are shown in Table 1.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
実施例５ 実施例１において、平均粒子径0.5μｍのタルクに代え
て、平均粒子径５μｍのマイカを用いたこと以外は、実
施例１と同様にして成形品を得、離型性の評価を行っ
た。結果を第１表に示す。Example 5 A molded article was obtained in the same manner as in Example 1 except that mica having an average particle size of 5 μm was used in place of talc having an average particle size of 0.5 μm, and the release property was evaluated. went. The results are shown in Table 1.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
比較例１ 実施例１において、シンジオタクチックポリスチレンの
配合量を70重量部としたこと、およびタルクを用いなか
ったこと以外は、実施例１と同様にして成形品を得、離
型性の評価を行った。結果を第１表に示す。Comparative Example 1 A molded article was obtained in the same manner as in Example 1 except that the amount of syndiotactic polystyrene was 70 parts by weight and that talc was not used, and the releasability was evaluated. I went. The results are shown in Table 1.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
比較例２ 実施例１において、平均粒子径60μｍのタルクを用いた
こと以外は、実施例１と同様にして成形品を得、離型性
の評価を行った。結果を第１表に示す。Comparative Example 2 A molded article was obtained in the same manner as in Example 1 except that talc having an average particle diameter of 60 μm was used, and the releasability was evaluated. The results are shown in Table 1.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
実施例６ 合成例２で得られた重量平均分子量350,000のシンジオ
タクチックポリスチレン68重量部、平均粒子径0.3μｍ
のタルク２重量部、長さ3mmのガラスチョップドストラ
ンド30重量部および酸化防止剤としてテトラキス〔メチ
レン（3,5−ジ−ｔ−ブチル−４−ヒドロキシハイドロ
シンナメート）〕メタン0.7重量部を配合し、実施例１
と同様にしてペレットを製造した。 Example 6 68 parts by weight of syndiotactic polystyrene having a weight average molecular weight of 350,000 obtained in Synthesis Example 2 and an average particle size of 0.3 μm
2 parts by weight of talc, 30 parts by weight of glass chopped strands having a length of 3 mm, and 0.7 parts by weight of tetrakis [methylene (3,5-di-t-butyl-4-hydroxyhydrocinnamate)] methane as an antioxidant are blended. Example 1
Pellets were produced in the same manner as in.
次いで、このペレットを70℃で一昼夜乾燥後、バレル温
度265℃−275℃−275℃、金型温度120℃、射出圧力700
〜900kg/cm2の条件で、ASTM1号ダンベルを成形した。金
型に彫り込んである深さ30μm,幅3mmのガス抜き溝に流
れ固まった薄片の流さでバリの出やすさを評価した。そ
の結果、薄片の長さは0.05mmと極めて小さかった。Then, the pellets were dried at 70 ° C for a whole day and night, then the barrel temperature was 265 ° C-275 ° C-275 ° C, the mold temperature was 120 ° C, and the injection pressure was 700
ASTM No. 1 dumbbell was molded under the condition of ~ 900 kg / cm 2 . The easiness of burr formation was evaluated by the flow of the thin pieces that flowed into the gas venting groove having a depth of 30 μm and a width of 3 mm engraved in the mold. As a result, the length of the thin piece was 0.05 mm, which was extremely small.
また、実施例１と同様に曲げ試験，熱変形温度の測定及
び結晶化度の測定を行った。結果を第２表に示す。In addition, the bending test, the measurement of the heat distortion temperature and the measurement of the crystallinity were performed in the same manner as in Example 1. The results are shown in Table 2.
比較例３ 実施例６において、シンジオタクチックポリスチレンの
配合量を70重量部としたこと、およびタルクを用いなか
ったこと以外は、実施例６と同様の操作を行って、バリ
の出やすさを評価した。その結果、薄片の長さは0.47mm
であった。Comparative Example 3 The procedure of Example 6 was repeated except that the amount of syndiotactic polystyrene was set to 70 parts by weight and that talc was not used, and the burr was easily produced. evaluated. As a result, the slice length is 0.47 mm
Met.
実施例７ 実施例１において、タルクの配合量を６重量部とし、合
成例１のシンジオタクチックポリスチレンを63重量部と
したこと以外は、実施例１と同様にして成形品を得、離
型性の評価を行った。結果を第３表に示す。また、実施
例１と同様に曲げ試験，熱変形温度の測定及び結晶化度
の測定をも行った。結果を第２表に示す。Example 7 A molded article was obtained in the same manner as in Example 1 except that the blending amount of talc was 6 parts by weight and the syndiotactic polystyrene of Synthesis Example 1 was 63 parts by weight. The sex was evaluated. The results are shown in Table 3. In addition, bending tests, heat distortion temperature measurements, and crystallinity measurements were performed in the same manner as in Example 1. The results are shown in Table 2.
実施例８ 実施例１において、用いるタルクの平均粒子径を20μｍ
としたこと以外は、実施例１と同様にして成形品を得、
離型性の評価を行った。結果を第３表に示す。また、実
施例１と同様に曲げ試験，熱変形温度の測定及び結晶化
度の測定をも行った。結果を第２表に示す。Example 8 The average particle size of talc used in Example 1 was 20 μm.
A molded article was obtained in the same manner as in Example 1, except that
The releasability was evaluated. The results are shown in Table 3. In addition, bending tests, heat distortion temperature measurements, and crystallinity measurements were performed in the same manner as in Example 1. The results are shown in Table 2.
〔発明の効果〕 以上のように、本発明のポリスチレン系樹脂組成物は、
耐熱性，耐薬品性，耐溶剤性さらには各種機械的強度の
すぐれたシンジオタクチック構造を有するスチレン系共
重合体をベースとし、これに結晶核剤の如く作用する50
μｍ以下の無機化合物を配合したものであるため、上記
スチレン系重合体の特製を維持しつつ、成形時の成形サ
イクルの向上，離型性の向上，金型温度の低下が可能と
なり、しかも成形に際してバリが著しく低減するなど様
々な面で成形性の改善されたものとなる。したがって、
本発明のポリスチレン型樹脂組成物は、成形性、特に射
出成形や押出成形に適したものであるとともに、得られ
た成形品は耐熱性，耐薬品性，耐溶剤性さらには各種機
械的強度のすぐれたものとなる。 [Effects of the Invention] As described above, the polystyrene resin composition of the present invention is
Based on a styrene copolymer with a syndiotactic structure with excellent heat resistance, chemical resistance, solvent resistance, and various mechanical strengths, it acts like a crystal nucleating agent.
Since an inorganic compound having a particle size of μm or less is blended, it is possible to improve the molding cycle at the time of molding, improve the releasability, and lower the mold temperature while maintaining the special production of the styrene polymer. At this time, the formability is improved in various aspects such as the remarkable reduction of burrs. Therefore,
The polystyrene type resin composition of the present invention is suitable for moldability, particularly injection molding and extrusion molding, and the obtained molded product has heat resistance, chemical resistance, solvent resistance and various mechanical strengths. It will be excellent.
それ故、本発明のポリスチレン系樹脂組成物は、極めて
実用的価値の高いものとして、各種産業用資材に有効か
つ幅広い利用が期待される。Therefore, the polystyrene-based resin composition of the present invention is expected to be effectively and widely used for various industrial materials, as having extremely high practical value.
───────────────────────────────────────────────────── フロントページの続き (56)参考文献 特開 昭62−257950（ＪＰ，Ａ) 特開 昭62−104818（ＪＰ，Ａ) 特開 平１−92205（ＪＰ，Ａ) 特開 昭62−257948（ＪＰ，Ａ) ─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A 62-257950 (JP, A) JP-A 62-104818 (JP, A) JP-A 1-92205 (JP, A) JP-A 62- 257948 (JP, A)
Claims (2)
有するスチレン系重合体100重量部および（Ｂ）平均粒
子径50μｍ以下の無機化合物0.01〜10重量部を主成分と
するポリスチレン系樹脂組成物。1. A polystyrene resin composition mainly comprising (A) 100 parts by weight of a styrene polymer having a syndiotactic structure and (B) 0.01 to 10 parts by weight of an inorganic compound having an average particle diameter of 50 μm or less.
グラファイト，二酸化チタン，シリカ，タルク，マイ
カ，アスベスト，亜鉛華，クレー，炭酸カルシウム、硫
酸カルシウム，炭酸バリウム，硫酸バリウム，炭酸マグ
ネシウム，酸化スズ，酸化アンチモン，石英，ドロマイ
ト，アルミナおよびカオリンよりなる群から選ばれた一
種または二種以上の化合物である特許請求の範囲第１項
記載のポリスチレン系樹脂組成物。2. The inorganic compound (B) is carbon black,
From the group consisting of graphite, titanium dioxide, silica, talc, mica, asbestos, zinc white, clay, calcium carbonate, calcium sulfate, barium carbonate, barium sulfate, magnesium carbonate, tin oxide, antimony oxide, quartz, dolomite, alumina and kaolin The polystyrene resin composition according to claim 1, which is one or more selected compounds.
Priority Applications (11)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26262887A JPH0791427B2 (en) | 1987-10-20 | 1987-10-20 | Polystyrene resin composition |
| KR1019890701125A KR940004093B1 (en) | 1987-10-20 | 1988-10-12 | Styrenic resin composition and process for producing molding products |
| PCT/JP1988/001040 WO1989003857A1 (en) | 1987-10-20 | 1988-10-12 | Styrenic resin composition and process for producing resin molding |
| AU25463/88A AU605383B2 (en) | 1987-10-20 | 1988-10-12 | Styrenic resin composition |
| DE88117305T DE3887260T2 (en) | 1987-10-20 | 1988-10-18 | Styrene-based resin mixture and process for producing molded parts. |
| EP88117305A EP0312976B1 (en) | 1987-10-20 | 1988-10-18 | Styrene-based resin composition and process for production of moldings |
| ES88117305T ES2050136T3 (en) | 1987-10-20 | 1988-10-18 | RESIN COMPOSITION BASED ON STYRENE AND PROCEDURE TO PRODUCE MOLDED PARTS. |
| AT88117305T ATE100482T1 (en) | 1987-10-20 | 1988-10-18 | STYRENE BASED RESIN MIX AND METHOD OF MAKING MOLDED PARTS. |
| CA000580559A CA1338991C (en) | 1987-10-20 | 1988-10-19 | Styrene-based resin composition and process for production of moldings |
| FI893010A FI97897C (en) | 1987-10-20 | 1989-06-19 | Styrene-based resin composition and process for making molded pieces |
| US07/810,369 US5322869A (en) | 1987-10-20 | 1991-12-18 | Styrene-based resin composition and process for production of moldings |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP26262887A JPH0791427B2 (en) | 1987-10-20 | 1987-10-20 | Polystyrene resin composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01108244A JPH01108244A (en) | 1989-04-25 |
| JPH0791427B2 true JPH0791427B2 (en) | 1995-10-04 |
Family
ID=17378435
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP26262887A Expired - Fee Related JPH0791427B2 (en) | 1987-10-20 | 1987-10-20 | Polystyrene resin composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0791427B2 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5798172A (en) * | 1994-12-07 | 1998-08-25 | Idemitsu Petrochemical Co., Ltd. | Styrenic resin composition and polystyrene oriented film |
| KR100364491B1 (en) * | 2000-07-18 | 2002-12-12 | 삼성종합화학주식회사 | Syndiotactic Polystyrene Nanocomposite and The Manufacturing Method Thereof |
-
1987
- 1987-10-20 JP JP26262887A patent/JPH0791427B2/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| JPH01108244A (en) | 1989-04-25 |
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