JPH0312098B2 - - Google Patents

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Publication number
JPH0312098B2
JPH0312098B2 JP55103563A JP10356380A JPH0312098B2 JP H0312098 B2 JPH0312098 B2 JP H0312098B2 JP 55103563 A JP55103563 A JP 55103563A JP 10356380 A JP10356380 A JP 10356380A JP H0312098 B2 JPH0312098 B2 JP H0312098B2
Authority
JP
Japan
Prior art keywords
butadiene
styrene
weight
polystyrene
block copolymer
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.)
Expired - Lifetime
Application number
JP55103563A
Other languages
Japanese (ja)
Other versions
JPS5730747A (en
Inventor
Yoshikazu Suda
Haruhisa Nagano
Seishiro Komura
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Asahi Chemical Industry Co Ltd
Original Assignee
Asahi Chemical Industry Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Asahi Chemical Industry Co Ltd filed Critical Asahi Chemical Industry Co Ltd
Priority to JP10356380A priority Critical patent/JPS5730747A/en
Publication of JPS5730747A publication Critical patent/JPS5730747A/en
Publication of JPH0312098B2 publication Critical patent/JPH0312098B2/ja
Granted legal-status Critical Current

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Description

【発明の詳細な説明】[Detailed description of the invention]

本発明は、透明でなおかつ折り曲げ特性の改良
されたスチレン系樹脂組成物に関する。 ポリスチレンは透明性と剛性を兼ね備えた樹脂
であるが、極めて耐衝撃性に劣り、脆いため、若
干の曲げ変形で容易に折れてしまう性質があつ
た。そのため、シート分野のうちヒンジ特性のよ
うな折り曲げ性を要求される用途では、2軸延伸
をしたポリスチレンあるいは耐衝撃性ポリスチレ
ンまたはスチレン−ブタジエンブロツク共重合体
等をブレンドしたポリスチレンが使用されてい
る。しかしながら、2軸延伸ポリスチレンは真空
成形、圧空成形等の成形性に難があり、また、耐
衝撃性ポリスチレンまたはスチレン−ブタジエン
ブロツク共重合体をブレンドしたポリスチレン
は、折り曲げ性を充分発現させると、透明性、剛
性等が低下し満足できるものではなかつた。 さらに特開昭51−89550号公報には、ポリスチ
レンと耐衝撃性ポリスチレンとスチレンを60重量
%以上含むスチレン−ブタジエンブロツク共重合
体の3者からなる広範な組成物が開示されてい
る。しかしながら、この組成物においても、ポリ
スチレンが50重量%以下の場合は、剛性が低く、
耐衝撃性ポリスチレンの割合が増加すれば透明性
が低下し、スチレン−ブタジエンブロツク共重合
体の割合が増加すれば折り曲げ時に層剥離現象を
生じ、また、耐衝撃性ポリスチレンおよびスチレ
ン−ブタジエンブロツク共重合体の割合が減少す
れば耐衝撃性が低下し、折り曲げによつて折れて
しまうというように、この3者からなる組成物で
は、剛性と耐衝撃性をある程度保持し、なおかつ
透明性と折り曲げ特性の両者を満足することは困
難と考えられていた。 本発明者らは、耐衝撃性ポリスチレンに含まれ
るスチレンがグラフトしたブタジエン系ゴム状重
合体とスチレン−ブタジエンブロツク共重合体中
のブタジエンブロツクがポリスチレン中で全く異
なつた分散状態をとることに着目して、スチレン
−ブタジエンブロツク共重合体のブレンドによつ
て生じる折り曲げ時の層剥離現象を、耐衝撃性ポ
リスチレン中のブタジエン系ゴム状重合体によつ
て解決すべく詳細な検討を行なつた結果、ブタジ
エン系ゴム状重合体が特定の粒径で分散した耐衝
撃性ポリスチレンを用い、また3種の重合体を極
めて特定な組成範囲に限定した場合においてのみ
層剥離現象がほとんど発生せずに良好な折り曲げ
特性が得られ、しかも透明性に優れた組成物が得
られることを見い出した。これは、ポリスチレン
とスチレン−ブタジエンブロツク共重合体の混合
物中では、ブロツク共重合体中のブタジエン部分
が整列し、そのため層剥離現象が発生するのを、
より大粒径のブタジエン系ゴム状重合体粒子を特
定の大きさで特定の量存在せしめることによつ
て、ブタジエン部分の破壊の伝播を防止するため
と推定される。 上記の知見に基く本発明は、ポリスチレンと、
ブタジエン系ゴム状重合体にスチレンをグラフト
重合して得られるブタジエン系ゴム状重合体がポ
リスチレンを内部に包含した形で平均粒径0.5〜
10μで分散した耐衝撃性ポリスチレンと、スチレ
ンを60〜85重量%含むスチレン−ブタジエンブロ
ツク共重合体からなる組成物においてポリスチレ
ンが50重量%以上であつて、かつ、ブタジエン系
ゴム状重合体の全組成物中の割合が0.4〜0.8重量
%であり、ブロツク共重合体に含まれるブタジエ
ンの全組成物中の割合が5〜10重量%であつて、
しかもブロツク共重合体中のブタジエンブロツク
が該組成物中で直径が0.1μ以下の球状または円柱
状であることを特徴とするスチレン系樹脂組成物
である。 本発明で用いられるブタジエン系ゴム状重合体
は、ポリブタジエン、スチレン−ブタジエン共重
合ゴム等のようなブタジエンを主体とするゴム状
重合体であり、通常の耐衝撃性ポリスチレンを得
る際に用いられるものである。 本発明で用いられるスチレン−ブタジエンブロ
ツク共重合体は、スチレンとブタジエンをアニオ
ン重合して得られるスチレン含量が60〜85重量
%、好ましくは60〜75重量%であるブロツク共重
合体であつて、(S−B)o、(S−B−)oS、(B−
S−)oB、(S−B−)nX〔こゝで、Sはスチレンブ
ロツク、Bはブタジエンブロツクを表わし、nは
1〜5の整数、mは2〜7の整数であり、Xはm
個の重合体鎖が結合している多官能性化合物残基
であり、これらのブロツク共重合体はテーパー部
分を含んでいてもよい〕等の一般式で示されるも
のである。 本発明においては、組成物中に2種類の補強性
ゴムがそれぞれ適切な粒径で、しかも適切な範囲
の量づつ含まれることが重要である。すなわち、
スチレン−ブタジエンブロツク共重合体中のブタ
ジエンブロツクは、組成物中で直径が0.1μ以下、
通常は0.05μ以下の球状または円柱状で分散して
おり、その量は5〜10重量%である必要がある。
スチレン−ブタジエンブロツク共重合体に含まれ
るブタジエンの量が全組成物の5重量%未満の場
合は、良好な折り曲げ特性が得られず、また10重
量%より多い場合は、折り曲げ時の層分離現象が
激しく、層分離を押えるための耐衝撃性ポリスチ
レンの添加量を増す必要が生じ、その結果、透明
性に劣るものになる。また、スチレンがグラフト
重合されたブタジエン系ゴム状重合体は、組成物
中でポリスチレンを内部に包含した形で平均粒径
が0.5〜10μ、好ましくは1〜5μの球状で分散して
いることが重要であり、しかも、その量は0.4〜
0.8重量%である必要がある。ブタジエン系ゴム
状重合体の平均粒径が0.5μより小さい場合、およ
びブタジエン系ゴム状重合体の量が全組成物の
0.4重量%未満の場合は、折り曲げ時のブロツク
共重合体による層剥離現象を防止する効果が少な
く、ブタジエン系ゴム状重合体の平均粒径が10μ
より大きい場合、およびブタジエン系ゴム重合体
の量が全組成物の0.8重量%より多い場合は、透
明性に劣り好ましくない。さらに、本発明組成物
において、ブロツク共重合体に含まれるブタジエ
ンの量がブタジエン系ゴム状重合体の量の10〜15
倍である範囲は、折り曲げ特性と層剥離現象防止
のバランスで最も好ましい。 本発明の組成物は、必要に応じて種々の添加剤
を、本発明の効果が失なわれない範囲で添加して
もよい。添加剤の例としては、安定剤、帯電防止
剤、紫外線吸収剤、滑剤等があげられる。 以下に本発明の効果を明らかにするために実施
例を示すが、本発明は、以下の実施例によつて限
定されるものではない。 実施例1〜8、比較例1〜9 ポリスチレンと耐衝撃性ポリスチレンとスチレ
ン−ブタジエンブロツク共重合体を、第1表に示
す組成比で混練および0.3mm厚のシート成形を行
ない、透明性と折り曲げ特性の測定を行なつた。
結果を第1表に示す。なお、実験方法は以下に示
す。 (1) 使用樹脂 ポリスチレン:スタイロン683 旭ダウ(株)製 HIPS−1:5重量%のポリブタジエンゴムを
溶解させたスチレンを塊状重合させて得られ
た耐衝撃性ポリスチレン(ポリブタジエンゴ
ムの平均粒径2μ) HIPS−2:8重量%のスチレン−ブタジエン
ゴムを溶解させたスチレンを塊状重合させて
得られた耐衝撃性ポリスチレン(スチレン−
ブタジエンゴムの平均粒径4μ) HIPS−3:5重量%のポリブタジエンゴムを
溶解させたスチレンを塊状重合させて得られ
た耐衝撃性ポリスチレン(ポリブタジエンゴ
ムの平均粒径0.3μ) HIPS−4:5重量%のポリブタジエンゴムを
溶解させたスチレンを塊状重合させて得られ
た耐衝撃性ポリスチレン(ポリブタジエンの
平均粒径12μ) ブロツク共重合体−1:スチレン−ブタジエン
−スチレン−ブタジエン型ブロツク共重合体
(分子量10000−42000−26000−42000)スチ
レン含量70重量% ブロツク共重合体−2:(スチレン−ブタジエ
ン)4X型ブロツク共重合体〔分子量(37000
−13000)4X〕スチレン含量74重量% ブロツク共重合体−3:スチレン−ブタジエン
−スチレン型ブロツク共重合体(分子量
48000−24000−48000)スチレン含量80重量
% ブロツク共重合体−4:ソルブレンT−414
旭化成工業製スチレン含量40重量% (2) シート成形 成形は40mmφ押出機を用い、Tダイ法で行な
つた。成形温度は210℃であり、得られたシー
トの厚みは0.3mmであつた。 (3) 測定 透明性はJIS−K−6714の測定法によつて全
光線透過率を測定した。また、折り曲げ特性は
10mm幅の試料の90゜折り曲げをくり返して、試
料の折れ、剥離状態等を観察した。
The present invention relates to a styrenic resin composition that is transparent and has improved bending properties. Although polystyrene is a resin that has both transparency and rigidity, it has extremely poor impact resistance and is brittle, so it easily breaks with slight bending deformation. Therefore, in the sheet field, for applications that require bendability such as hinge properties, biaxially oriented polystyrene, impact-resistant polystyrene, or polystyrene blended with styrene-butadiene block copolymer is used. However, biaxially oriented polystyrene has difficulty in formability in vacuum forming, pressure forming, etc., and impact-resistant polystyrene or polystyrene blended with styrene-butadiene block copolymer does not become transparent once bendability is sufficiently developed. The properties were not satisfactory due to a decrease in properties such as toughness and rigidity. Further, JP-A-51-89550 discloses a wide range of compositions consisting of polystyrene, impact-resistant polystyrene, and a styrene-butadiene block copolymer containing 60% by weight or more of styrene. However, even in this composition, if the polystyrene content is 50% by weight or less, the rigidity is low;
As the proportion of high-impact polystyrene increases, the transparency decreases, and as the proportion of styrene-butadiene block copolymer increases, delamination occurs during bending. If the percentage of coalescence decreases, the impact resistance will decrease and it will break when folded, so a composition consisting of these three components maintains some degree of rigidity and impact resistance, while also maintaining transparency and bending properties. It was considered difficult to satisfy both. The present inventors noticed that the styrene-grafted butadiene-based rubbery polymer contained in high-impact polystyrene and the butadiene block in the styrene-butadiene block copolymer take completely different dispersion states in polystyrene. As a result of a detailed study to solve the delamination phenomenon during bending caused by blending styrene-butadiene block copolymers by using a butadiene-based rubbery polymer in high-impact polystyrene, we found that: Only when high-impact polystyrene in which a butadiene-based rubbery polymer is dispersed with a specific particle size, and when the three types of polymers are limited to a very specific composition range, can a good result be achieved with almost no delamination phenomenon. It has been found that a composition with good bending properties and excellent transparency can be obtained. This is because in a mixture of polystyrene and styrene-butadiene block copolymer, the butadiene moieties in the block copolymer are aligned, which causes delamination phenomenon.
It is presumed that this is to prevent the propagation of destruction of the butadiene moiety by allowing larger butadiene-based rubbery polymer particles of a specific size and amount to exist. Based on the above knowledge, the present invention provides polystyrene,
Butadiene-based rubbery polymer obtained by graft polymerizing styrene onto butadiene-based rubbery polymer contains polystyrene inside and has an average particle size of 0.5~
In a composition consisting of high-impact polystyrene dispersed in 10 μm and a styrene-butadiene block copolymer containing 60 to 85% by weight of styrene, polystyrene accounts for 50% by weight or more and the total amount of butadiene-based rubbery polymer is The proportion in the composition is 0.4 to 0.8% by weight, and the proportion of butadiene contained in the block copolymer in the total composition is 5 to 10% by weight,
Moreover, the styrenic resin composition is characterized in that the butadiene blocks in the block copolymer are spherical or cylindrical with a diameter of 0.1 μm or less. The butadiene-based rubbery polymer used in the present invention is a rubbery polymer mainly composed of butadiene, such as polybutadiene, styrene-butadiene copolymer rubber, etc., and is used to obtain ordinary impact-resistant polystyrene. It is. The styrene-butadiene block copolymer used in the present invention is a block copolymer obtained by anionic polymerization of styrene and butadiene and has a styrene content of 60 to 85% by weight, preferably 60 to 75% by weight, and (S-B) o , (S-B-) o S, (B-
S-) o B, (S-B-) n is m
These block copolymers may contain a tapered portion. In the present invention, it is important that the two types of reinforcing rubbers be contained in the composition, each having an appropriate particle size and an amount within an appropriate range. That is,
The butadiene block in the styrene-butadiene block copolymer has a diameter of 0.1μ or less in the composition.
It is usually dispersed in a spherical or cylindrical shape with a size of 0.05μ or less, and the amount thereof needs to be 5 to 10% by weight.
If the amount of butadiene contained in the styrene-butadiene block copolymer is less than 5% by weight of the total composition, good bending properties cannot be obtained, and if it is more than 10% by weight, layer separation occurs during bending. is severe, and it becomes necessary to increase the amount of impact-resistant polystyrene added to suppress layer separation, resulting in poor transparency. In addition, the butadiene-based rubbery polymer graft-polymerized with styrene is dispersed in the composition in a spherical shape with an average particle size of 0.5 to 10 μm, preferably 1 to 5 μm, with polystyrene contained inside. important, and the amount is 0.4~
It needs to be 0.8% by weight. If the average particle size of the butadiene-based rubbery polymer is less than 0.5μ, and if the amount of butadiene-based rubbery polymer is
If it is less than 0.4% by weight, it will be less effective in preventing the delamination phenomenon caused by the block copolymer during bending, and the average particle size of the butadiene rubber-like polymer will be 10μ.
If the amount is larger, or if the amount of the butadiene rubber polymer is more than 0.8% by weight of the total composition, the transparency will be poor and this is not preferred. Furthermore, in the composition of the present invention, the amount of butadiene contained in the block copolymer is 10 to 15 times the amount of the butadiene-based rubbery polymer.
A range that is twice that is most preferable in terms of the balance between bending properties and prevention of layer peeling. If necessary, various additives may be added to the composition of the present invention as long as the effects of the present invention are not lost. Examples of additives include stabilizers, antistatic agents, ultraviolet absorbers, and lubricants. Examples are shown below to clarify the effects of the present invention, but the present invention is not limited to the following examples. Examples 1 to 8, Comparative Examples 1 to 9 Polystyrene, impact-resistant polystyrene, and styrene-butadiene block copolymer were kneaded and formed into a 0.3 mm thick sheet at the composition ratio shown in Table 1, and the transparency and bending were evaluated. Characteristics were measured.
The results are shown in Table 1. The experimental method is shown below. (1) Resin used Polystyrene: Styron 683 Manufactured by Asahi Dow Co., Ltd. HIPS-1: Impact-resistant polystyrene obtained by bulk polymerizing styrene in which 5% by weight of polybutadiene rubber is dissolved (average particle size of polybutadiene rubber 2μ) ) HIPS-2: High-impact polystyrene (styrene-butadiene rubber) obtained by bulk polymerizing styrene in which 8% by weight of styrene-butadiene rubber is dissolved.
Average particle size of butadiene rubber: 4μ) HIPS-3: Impact-resistant polystyrene obtained by bulk polymerizing styrene in which 5% by weight of polybutadiene rubber is dissolved (average particle size of polybutadiene rubber: 0.3μ) HIPS-4: 5 Impact-resistant polystyrene obtained by bulk polymerizing styrene in which % by weight of polybutadiene rubber is dissolved (average particle size of polybutadiene 12μ) Block copolymer-1: Styrene-butadiene-styrene-butadiene type block copolymer ( Molecular weight 10000-42000-26000-42000) Styrene content 70% by weight Block copolymer-2: (Styrene-butadiene) 4 X-type block copolymer [Molecular weight (37000
-13000) 4
48000-24000-48000) Styrene content 80% by weight Block copolymer-4: Solblen T-414
Styrene content: 40% by weight, manufactured by Asahi Kasei Kogyo (2) Sheet molding Molding was performed using a 40 mmφ extruder by the T-die method. The molding temperature was 210°C, and the thickness of the obtained sheet was 0.3 mm. (3) Measurement Transparency was determined by measuring total light transmittance according to the measuring method of JIS-K-6714. In addition, the bending characteristics are
A sample with a width of 10 mm was repeatedly bent at 90 degrees, and the state of bending and peeling of the sample was observed.

【表】 以上に示したように、本発明の組成物は、透明
性に優れ、しかも折り曲げ特性において従来のス
チレン系樹脂組成物では得られない特性を有して
おり、ヒンジ特性を必要とする容器等の用途に極
めて有用である。また、層剥離現象が生じないた
め、打ち抜き性が良好であり、したがつて、トレ
ー等の容器にも使用可能であり、さらに、逆にノ
ツチをつけて折る場合にも層剥離しないため、表
層だけが残るといつた現象がなく、ポーシヨンパ
ツクの容器にも使用可能である。
[Table] As shown above, the composition of the present invention has excellent transparency and bending properties that cannot be obtained with conventional styrene resin compositions, and requires hinge properties. It is extremely useful for applications such as containers. In addition, since no layer peeling phenomenon occurs, the punching property is good, and therefore it can be used for containers such as trays.Furthermore, since there is no layer peeling even when folding with a notch, the surface layer can be easily punched out. There is no phenomenon that only residue remains, and it can also be used in potion pack containers.

Claims (1)

【特許請求の範囲】[Claims] 1 ポリスチレンと、ブタジエン系ゴム状重合体
にスチレンをグラフト重合して得られるブタジエ
ン系ゴム重合体がポリスチレンを内部に包含した
形で平均粒径0.5〜10μで分散した耐衝撃性ポリス
チレンと、スチレンを60〜85重量%含むスチレン
−ブタジエンブロツク共重合体からなる組成物に
おいて、ポリスチレンが50重量%以上であつて、
かつ、ブタジエン系ゴム状重合体の全組成物中の
割合が0.4〜0.8重量%であり、ブロツク共重合体
に含まれるブタジエンの全組成物中の割合が5〜
10重量%であつて、しかもブロツク共重合体中の
ブタジエンブロツクが該組成物中で直径が0.1μ以
下の球状または円柱状であることを特徴とするス
チレン系樹脂組成物。
1. Polystyrene and impact-resistant polystyrene, in which a butadiene-based rubber polymer obtained by graft polymerizing styrene to a butadiene-based rubbery polymer is dispersed with an average particle size of 0.5 to 10μ in a form that contains polystyrene inside, and styrene. In a composition consisting of a styrene-butadiene block copolymer containing 60 to 85% by weight, the polystyrene content is 50% by weight or more,
and the proportion of the butadiene-based rubbery polymer in the total composition is 0.4 to 0.8% by weight, and the proportion of butadiene contained in the block copolymer in the total composition is 5 to 0.8% by weight.
10% by weight of a styrenic resin composition, wherein the butadiene blocks in the block copolymer are spherical or cylindrical with a diameter of 0.1 μm or less.
JP10356380A 1980-07-30 1980-07-30 Styrene type resin composition Granted JPS5730747A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10356380A JPS5730747A (en) 1980-07-30 1980-07-30 Styrene type resin composition

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10356380A JPS5730747A (en) 1980-07-30 1980-07-30 Styrene type resin composition

Publications (2)

Publication Number Publication Date
JPS5730747A JPS5730747A (en) 1982-02-19
JPH0312098B2 true JPH0312098B2 (en) 1991-02-19

Family

ID=14357266

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10356380A Granted JPS5730747A (en) 1980-07-30 1980-07-30 Styrene type resin composition

Country Status (1)

Country Link
JP (1) JPS5730747A (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6177331U (en) * 1984-10-26 1986-05-24
JP2006176670A (en) * 2004-12-22 2006-07-06 Risu Pack Co Ltd Thermoforming styrenic resin sheet and molded article molded by using the same
KR101370772B1 (en) 2006-07-18 2014-03-06 다이니폰 인사츠 가부시키가이샤 Ink ribbon cassette
JP2008044360A (en) * 2006-07-18 2008-02-28 Dainippon Printing Co Ltd Ink ribbon cassette

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US3907930A (en) * 1973-11-09 1975-09-23 Monsanto Co Toughened polymeric polyblend having high flow and ductility
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