JPH06128339A - Rubber-modified polystyrene resin composition - Google Patents

Rubber-modified polystyrene resin composition

Info

Publication number
JPH06128339A
JPH06128339A JP27847292A JP27847292A JPH06128339A JP H06128339 A JPH06128339 A JP H06128339A JP 27847292 A JP27847292 A JP 27847292A JP 27847292 A JP27847292 A JP 27847292A JP H06128339 A JPH06128339 A JP H06128339A
Authority
JP
Japan
Prior art keywords
rubber
particles
modified polystyrene
resin composition
particle size
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.)
Granted
Application number
JP27847292A
Other languages
Japanese (ja)
Other versions
JP3198664B2 (en
Inventor
周二 ▲よし▼見
Shiyuuji Yoshimi
Isato Kihara
勇人 木原
Hiroshi Miyagi
浩 宮城
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.)
Sumitomo Chemical Co Ltd
Original Assignee
Sumitomo Chemical 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 Sumitomo Chemical Co Ltd filed Critical Sumitomo Chemical Co Ltd
Priority to JP27847292A priority Critical patent/JP3198664B2/en
Publication of JPH06128339A publication Critical patent/JPH06128339A/en
Application granted granted Critical
Publication of JP3198664B2 publication Critical patent/JP3198664B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE:To obtain the title compsn. excellent in impact resistance and appearance. CONSTITUTION:The compsn. contains soft component particles (A) and copolymer rubber particles (B) both dispersed in the compsn. and satisfies the conditions that particles A have a salami structure and a mean particle size of 0.7-1.7mum, while particles B have a mean particle size of 0.5mum or lower and a core-shell structure comprising a shell consisting mainly of a polymer formed from a styrenic monomer and/or a (meth)acrylic ester monomer and a core consisting mainly of a rubbery polymer formed from a diolefin monomer, and that the wt. proportion of A (Xwt.%) and that of B (Ywt.%) satisfy the relations: 5<=(X+Y)<=30 and 60<=(X/(X+Y))X100<=99.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は、ゴム変性ポリスチレン
系樹脂組成物に関するものである。更に詳しくは、本発
明は、耐衝撃性を高め、かつ表面外観をも改良したゴム
変性ポリスチレン系樹脂組成物に関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rubber-modified polystyrene resin composition. More specifically, the present invention relates to a rubber-modified polystyrene resin composition having improved impact resistance and improved surface appearance.

【0002】[0002]

【従来の技術】一般に、ポリスチレンなどのような硬く
て脆い樹脂の耐衝撃性を改良する方法として、ゴム状重
合体の存在下に樹脂単量体を重合することにより、マト
リクスであるスチレン系樹脂中に軟質成分粒子を分散さ
せる、いわゆるグラフトタイプのゴム変性ポリスチレン
とする方法が知られている。しかしながら、かかるグラ
フトタイプのゴム変性ポリスチレンにおいては、ゴム状
重合体を含有してなる軟質成分粒子の粒子径の大きさは
耐衝撃性と剛性に密接な関係をもち、軟質成分粒子の粒
子径が小さいほど剛性には優れるが、粒子径がある限界
以下になると耐衝撃性が急激に低下し、一方軟質成分の
粒子径がある程度以上では、高い耐衝撃強度が得られる
ものの、剛性は低下する傾向をもつことが知られてい
る。また、最終製品であるゴム変性ポリスチレンの外観
は上記の粒子径に関連し、優れた外観を得るためには、
粒子径が小さくなければならないことも知られている。
2. Description of the Related Art Generally, as a method for improving the impact resistance of a hard and brittle resin such as polystyrene, a styrene resin as a matrix is obtained by polymerizing a resin monomer in the presence of a rubbery polymer. A method is known in which soft component particles are dispersed in a so-called graft type rubber-modified polystyrene. However, in such a graft type rubber-modified polystyrene, the particle size of the soft component particles containing the rubber-like polymer is closely related to impact resistance and rigidity, and the particle size of the soft component particles is The smaller the particle size, the better the rigidity, but when the particle size falls below a certain limit, the impact resistance sharply decreases, while when the particle size of the soft component is above a certain level, high impact strength can be obtained, but the rigidity tends to decrease. Is known to have. Further, the appearance of the rubber-modified polystyrene as the final product is related to the above particle size, and in order to obtain an excellent appearance,
It is also known that the particle size must be small.

【0003】[0003]

【発明が解決しようとする課題】かかる状況に鑑み、本
発明が解決しようとする課題は、耐衝撃性を高め、かつ
表面外観に優れたゴム変性ポリスチレン系樹脂組成物を
提供することにある。
SUMMARY OF THE INVENTION In view of the above situation, an object of the present invention is to provide a rubber-modified polystyrene resin composition having improved impact resistance and excellent surface appearance.

【0004】[0004]

【課題を解決するための手段】本発明者らは、上記の課
題を解決すべく鋭意検討の結果、本発明に到達したもの
である。すなわち、本発明は、マトリックスとしてのス
チレン系樹脂に、軟質成分粒子及びゴム系共重合体粒子
が分散したゴム変性ポリスチレン系樹脂組成物であっ
て、下記(a)〜(c)の条件を充足するゴム変性ポリ
スチレン系樹脂組成物に係るものである。 (a)軟質成分粒子はサラミ構造を有し、その平均粒子
系が0.7μm以上、1.7μm未満であること (b)ゴム系共重合体粒子はコア−シェル構造を有し、
シェル部分はスチレン系単量体及び/又は(メタ)アク
リル酸エステル単量体の重合体を主成分とし、コア部分
はジオレフィン単量体のゴム系重合体を主成分とし、か
つ該ゴム系共重合体粒子の平均粒子径は0.5μm以下
であること (c)ゴム変性ポリスチレン系樹脂組成物中における軟
質成分粒子の重量割合(X重量%)とゴム系共重合体粒
子の重量割合(Y重量%)について、下式(1)及び
(2)の関係が成立すること 5≦(X+Y)≦30 (1) 60≦(X/(X+Y))×100≦99 (2)
The present inventors have arrived at the present invention as a result of intensive studies to solve the above problems. That is, the present invention is a rubber-modified polystyrene-based resin composition in which soft component particles and rubber-based copolymer particles are dispersed in a styrene-based resin as a matrix, which satisfies the following conditions (a) to (c). And a rubber-modified polystyrene resin composition. (A) The soft component particles have a salami structure, and their average particle size is 0.7 μm or more and less than 1.7 μm. (B) The rubber-based copolymer particles have a core-shell structure,
The shell portion contains a polymer of a styrene monomer and / or a (meth) acrylic acid ester monomer as a main component, the core portion contains a rubber polymer of a diolefin monomer as a main component, and the rubber The average particle size of the copolymer particles is 0.5 μm or less. (C) The weight ratio (X% by weight) of the soft component particles in the rubber-modified polystyrene-based resin composition and the weight ratio of the rubber-based copolymer particles ( Y weight%), the relations of the following formulas (1) and (2) are established: 5 ≦ (X + Y) ≦ 30 (1) 60 ≦ (X / (X + Y)) × 100 ≦ 99 (2)

【0005】以下、詳細に説明する。マトリックスとし
てのスチレン系樹脂とは、スチレンからなる樹脂のほ
か、α−メチルスチレン、o−メチルスチレン、m−メ
チルスチレン、p−メチルスチレン、2,4−ジクロル
スチレン、2,5−ジクロルスチレンなどのアルキル置
換スチレンからなる樹脂をも含む。
The details will be described below. The styrene-based resin as a matrix includes, in addition to a resin made of styrene, α-methylstyrene, o-methylstyrene, m-methylstyrene, p-methylstyrene, 2,4-dichlorostyrene, 2,5-dichlorostyrene. It also includes resins made of alkyl-substituted styrenes such as styrene.

【0006】本発明の軟質成分粒子は、いわゆるサラミ
構造を有するものである。サラミ構造とは、セル構造と
も呼ばれ、粒子構造を有するゴム状重合体相中にスチレ
ン系樹脂の小粒子が点在する構造をさす。なお、軟質成
分粒子の構造は、透過型電子顕微鏡を用いた観察により
判定できる。
The soft component particles of the present invention have a so-called salami structure. The salami structure, which is also called a cell structure, refers to a structure in which small particles of a styrene resin are scattered in a rubber-like polymer phase having a particle structure. The structure of the soft component particles can be determined by observation using a transmission electron microscope.

【0007】軟質成分粒子中のゴム状重合体相をなすゴ
ム状重合体としては、たとえば公知のミドルシス及びハ
イシスポリブタジエン、スチレンーブタジエンブロック
共重合体、スチレンーブタジエンースチレンブロック共
重合体、ポリイソプレン、スチレンーイソプレンブロッ
ク共重合体、スチレンーイソプレンースチレンブロック
共重合体、及び該共重合体水添物、エチレンープロピレ
ンゴムが用いられる。
Examples of the rubber-like polymer forming the rubber-like polymer phase in the soft component particles include known middle-cis and high-cis polybutadiene, styrene-butadiene block copolymer, styrene-butadiene-styrene block copolymer, poly Isoprene, styrene-isoprene block copolymer, styrene-isoprene-styrene block copolymer, hydrogenated product of the copolymer, and ethylene-propylene rubber are used.

【0008】軟質成分粒子の平均粒子径は0.7μm以
上、1.7μm未満である。該粒子径が過小な場合は耐
衝撃性の改良効果に劣り、一方該粒子径が過大な場合は
表面外観に劣る。ここで、軟質成分粒子の平均粒子径
は、以下の方法により求められる。すなわち、ゴム変性
ポリスチレン系樹脂組成物の透過型電子顕微鏡写真の画
像解析により、軟質成分粒子の粒子径(di )とその個
数Ni を求め、下式に従い平均粒子径dを求める。 d=Σ(di 4 i /Σ(di 3 i
The average particle size of the soft component particles is 0.7 μm or more and less than 1.7 μm. If the particle size is too small, the effect of improving impact resistance is poor, while if the particle size is too large, the surface appearance is poor. Here, the average particle diameter of the soft component particles is determined by the following method. That is, the particle size (d i ) of soft component particles and the number N i thereof are obtained by image analysis of a transmission electron micrograph of the rubber-modified polystyrene resin composition, and the average particle size d is obtained according to the following formula. d = Σ (d i ) 4 N i / Σ (d i ) 3 N i

【0009】本発明のゴム系共重合体粒子は、いわゆる
コア−シェル構造を有し、シェル部分はスチレン系単量
体及び/又は(メタ)アクリル酸エステル単量体の重合
体を主成分とし、コア部分はジオレフィン単量体のゴム
系重合体を主成分とし、かつ該ゴム系共重合体粒子の平
均粒子径は0.5μm以下であるものである。
The rubber-based copolymer particles of the present invention have a so-called core-shell structure, and the shell portion is mainly composed of a polymer of a styrene monomer and / or a (meth) acrylic acid ester monomer. The core portion is mainly composed of a rubber polymer of a diolefin monomer, and the rubber copolymer particles have an average particle diameter of 0.5 μm or less.

【0010】コア−シェル構造とは、単一オクルージョ
ン構造又はカプセル構造とも呼ばれ、コア部分とシェル
部分で構成された構造を指す。なお、ゴム系共重合体粒
子の構造は、透過型電子顕微鏡を用いた観察により判定
できる。
The core-shell structure, which is also called a single occlusion structure or a capsule structure, refers to a structure composed of a core portion and a shell portion. The structure of the rubber-based copolymer particles can be determined by observation with a transmission electron microscope.

【0011】シェル部分の構成成分であるスチレン系単
量体については、前記のマトリクスを構成するスチレン
系単量体のところで説明したとおりである。シェル部分
のもうひとつの構成成分である(メタ)アクリル酸エス
テル単量体とは、アクリル酸エステル単量体及び/又は
メタクリル酸エステル単量体を意味し、具体的にはメタ
クリル酸メチル、メタクリル酸エチル、メタクリル酸プ
ロピル、メタクリル酸イソプロピル、メタクリル酸ブチ
ル、アクリル酸エチル、アクリル酸ブチルなどをあげる
ことができる。なお、これらはその一種を単独で用いて
もよく、又は二種以上を組み合わせて用いてもよい。
The styrene-based monomer which is a constituent of the shell portion is as described in the styrene-based monomer which constitutes the matrix. The (meth) acrylic acid ester monomer, which is another constituent component of the shell portion, means an acrylic acid ester monomer and / or a methacrylic acid ester monomer, and specifically, methyl methacrylate, methacrylic acid Examples thereof include ethyl acidate, propyl methacrylate, isopropyl methacrylate, butyl methacrylate, ethyl acrylate and butyl acrylate. In addition, these may be used individually by 1 type, or may be used in combination of 2 or more type.

【0012】本発明のゴム系共重合体粒子のシェル部分
は、上記のスチレン系単量体の単独重合体、(メタ)ア
クリル酸エステル単量体の単独重合体又はスチレン系単
量体と(メタ)アクリル酸エステル単量体の共重合体を
主成分とするものである。
The shell portion of the rubber-based copolymer particles of the present invention comprises a homopolymer of the above-mentioned styrene-based monomer, a homopolymer of (meth) acrylic acid ester monomer or a styrene-based monomer ( The main component is a copolymer of (meth) acrylic acid ester monomer.

【0013】本発明のゴム系共重合体粒子のコア部分
は、ジオレフィン単量体のゴム系重合体を主成分するも
のである。ジオレフィン単量体としてはプロパジエン、
1,2−ブタジエン、1,3−ブタジエン、イソプレ
ン、クロロプレン、1,3−ペンタジエンなどがあり、
これらの中ではブタジエン又はその誘導体が好適であ
る。コア部分は、上記のジオレフィン単量体の重合体を
主成分とするが、これらジオレフィンと共重合が可能な
ビニル単量体を共重合したものを用いることもできる。
ゴム系共重合体粒子の平均粒子系は0.5μm以下、好
ましくは0.3μm以下である。該粒子径が過大な場合
は光沢、すなわち表面外観に劣る。ここで、ゴム系共重
合体粒子の平均粒子径は、前記の軟質成分粒子の平均粒
子径と同様の方法により求められる。
The core portion of the rubber-based copolymer particles of the present invention is mainly composed of a rubber-based polymer of a diolefin monomer. As the diolefin monomer, propadiene,
1,2-butadiene, 1,3-butadiene, isoprene, chloroprene, 1,3-pentadiene, etc.,
Of these, butadiene and its derivatives are preferred. The core portion contains a polymer of the above diolefin monomer as a main component, but a copolymer of a vinyl monomer copolymerizable with these diolefins can also be used.
The average particle size of the rubber-based copolymer particles is 0.5 μm or less, preferably 0.3 μm or less. If the particle size is too large, the gloss, that is, the surface appearance is poor. Here, the average particle diameter of the rubber-based copolymer particles is determined by the same method as the average particle diameter of the soft component particles.

【0014】本発明のゴム変性ポリスチレン系樹脂組成
物は、ゴム変性ポリスチレン系樹脂組成物中における軟
質成分粒子の重量割合(X重量%)とゴム系共重合体粒
子の重量割合(Y重量%)について、下式(1)及び
(2)の関係が成立するものである。 5≦(X+Y)≦30 (1) 60≦(X/(X+Y))×100≦99 (2)
The rubber-modified polystyrene-based resin composition of the present invention comprises a rubber-modified polystyrene-based resin composition in which the weight ratio of soft component particles (X% by weight) and the weight ratio of rubber-based copolymer particles (Y% by weight). For, the relations of the following equations (1) and (2) are established. 5 ≦ (X + Y) ≦ 30 (1) 60 ≦ (X / (X + Y)) × 100 ≦ 99 (2)

【0015】すなわち、(X+Y)は5〜30、好まし
くは10〜25である。該値が過小であると耐衝撃性に
劣り、一方該値が過大であると外観に劣る。また、(X
/(X+Y))×100は60〜99である。該値が過
小であると耐衝撃性の改良効果が不十分であり、本発明
の目的を達成できない。
That is, (X + Y) is 5 to 30, preferably 10 to 25. If the value is too small, the impact resistance is poor, while if the value is too large, the appearance is poor. Also, (X
/ (X + Y)) * 100 is 60-99. If the value is too small, the effect of improving impact resistance is insufficient and the object of the present invention cannot be achieved.

【0016】なお、X及びYのそれぞれについても、5
〜30の範囲にあることが好ましい。これらの値が過小
であると耐衝撃性に劣り、一方該値が過大であると外観
に劣ることがある。
For each of X and Y, 5
It is preferably in the range of -30. If these values are too small, the impact resistance may be poor, and if the values are too large, the appearance may be poor.

【0017】ゴム変性ポリスチレン系樹脂組成物中にお
ける軟質成分粒子の重量割合(X重量%)は下記の方法
により測定される。すなわち、ゴム系共重合体粒子を含
まないグラフトタイプのゴム変性ポリスチレン系樹脂組
成物約0.5gを、室温(23℃)のメチルエチルケト
ン/メタノール混合溶媒(体積比=10/1)50ml
に溶解させ、そのときの不溶分の乾燥重量をもって軟質
成分粒子の重量とし、該軟質成分粒子の重量の用いたゴ
ム変性ポリスチレン系樹脂組成物に対する重量割合をも
ってX値とする。また、ゴム変性ポリスチレン系樹脂組
成物中におけるゴム系共重合体粒子の重量割合(Y重量
%)は、ゴム変性ポリスチレン系樹脂組成物を製造する
際に用いたゴム系共重合体粒子の重量から求められる。
更に、X値及びY値は、ゴム変性ポリスチレン系樹脂組
成物の超薄切片を透過電子顕微鏡で観察して得られる写
真を画像解析し、各粒子の占める面積から求めることも
できる。
The weight ratio (X% by weight) of the soft component particles in the rubber-modified polystyrene resin composition is measured by the following method. That is, about 0.5 g of a graft-type rubber-modified polystyrene-based resin composition containing no rubber-based copolymer particles was mixed with 50 ml of a room temperature (23 ° C.) methyl ethyl ketone / methanol mixed solvent (volume ratio = 10/1).
And the dry weight of the insoluble matter at that time is taken as the weight of the soft component particles, and the weight ratio of the weight of the soft component particles to the rubber-modified polystyrene resin composition used is taken as the X value. The weight ratio (Y% by weight) of the rubber-based copolymer particles in the rubber-modified polystyrene-based resin composition is calculated from the weight of the rubber-based copolymer particles used in producing the rubber-modified polystyrene-based resin composition. Desired.
Further, the X value and the Y value can also be determined from the area occupied by each particle by image analysis of a photograph obtained by observing an ultrathin section of the rubber-modified polystyrene-based resin composition with a transmission electron microscope.

【0018】本発明のゴム変性ポリスチレン系樹脂組成
物を製造する方法は、たとえば次のとおりである。すな
わち、ゴム状重合体の存在下、スチレン系単量体を重合
することにより軟質成分粒子を含有するグラフトタイプ
のゴム変性ポリスチレンを得る。ここで、軟質成分粒子
構造、平均粒子径、粒子含有量の調整は、用いるゴム状
重合体量、攪拌速度、重合温度などの重合条件を調整す
ることにより制御する。なお、重合方法としては、公知
の塊状重合法又は塊状−懸濁二段重合法を用いることが
できる。
The method for producing the rubber-modified polystyrene resin composition of the present invention is, for example, as follows. That is, a graft type rubber-modified polystyrene containing soft component particles is obtained by polymerizing a styrene-based monomer in the presence of a rubber-like polymer. Here, the soft component particle structure, the average particle diameter, and the particle content are controlled by adjusting the polymerization conditions such as the amount of the rubber-like polymer used, the stirring speed, and the polymerization temperature. As the polymerization method, a known bulk polymerization method or a bulk-suspension two-stage polymerization method can be used.

【0019】一方、前記のジオレフィン単量体を用い
て、通常の方法でゴムラテックスを得、該ゴムラテック
スに前記のスチレン系単量体及び/又は(メタ)アクリ
ル酸エステル単量体からなる重合体をグラフトさせるこ
とにより本発明のコア−シェル構造を有するゴム系共重
合体粒子を得る。なお、ゴム系共重合体粒子としては、
樹脂改質剤として市販されている該当品を用いてもよ
い。次に、上記のグラフトタイプのゴム変性ポリスチレ
ンと上記のゴム系共重合体粒子を混合することにより、
本発明のゴム変性ポリスチレン系樹脂が得られる。ここ
で、ゴム変性ポリスチレン系樹脂組成物においてゴム系
共重合体粒子が十分に微細な状態で分散している必要が
あり、そのためには二軸スクリュー押出機を用いて、溶
融混練することが好ましい。ゴム系共重合体粒子の分散
が不十分であると、目的の物性が十分に発現しない。
On the other hand, a rubber latex is obtained by a usual method using the above-mentioned diolefin monomer, and the rubber latex is composed of the above-mentioned styrene monomer and / or (meth) acrylic acid ester monomer. The rubber-based copolymer particles having the core-shell structure of the present invention are obtained by grafting the polymer. As the rubber-based copolymer particles,
A commercially available product may be used as the resin modifier. Next, by mixing the above-mentioned graft type rubber-modified polystyrene and the above rubber-based copolymer particles,
The rubber-modified polystyrene resin of the present invention is obtained. Here, in the rubber-modified polystyrene-based resin composition, the rubber-based copolymer particles need to be dispersed in a sufficiently fine state, and for that purpose, it is preferable to melt-knead using a twin-screw extruder. . If the dispersion of the rubber-based copolymer particles is insufficient, the desired physical properties are not sufficiently expressed.

【0020】本発明のゴム変性ポリスチレン系樹脂組成
物においては、上記で説明した必須の成分以外に、本発
明の特徴を損なわない範囲で、汎用ポリスチレン樹脂を
混合・併用してもよく、更に劣化防止剤、可塑剤離型
剤、シリコンオイルなどの補助成分を添加してもよい。
In the rubber-modified polystyrene resin composition of the present invention, a general-purpose polystyrene resin may be mixed and used in combination with the essential components described above within a range not impairing the features of the present invention, and further deteriorated. Auxiliary components such as an inhibitor, a plasticizer release agent and silicone oil may be added.

【0021】本発明のゴム変性ポリスチレン系樹脂組成
物は、剛性を高水準に維持しつつ耐衝撃性を高め、かつ
表面外観をも改良したものであり、OA機器、家電製
品、シートなどの分野において好適に用いられる。
The rubber-modified polystyrene resin composition of the present invention has improved rigidity while maintaining a high level of rigidity and improved surface appearance, and is used in fields such as office automation equipment, home electric appliances and sheets. Is preferably used in.

【0022】[0022]

【実施例】以下に実施例を示すが、本発明はこれらの実
施例に限定されるものではない。なお、実施例に示され
たデータは、次の方法に基づいて測定されたものであ
る。 (1)アイゾット衝撃強度(耐衝撃性) JIS K7110に準拠して測定した。ただし、ノッ
チ付サンプルの厚みが6.4mmの規格を採用した。 (2)剛性(曲げ弾性率) JIS K−7203に準拠して測定した。 (3)光沢 射出成形機により150×90×2mmの平板を成形
し、平板の中央部の45°光沢度をJIS K7105
に準拠して測定した。
EXAMPLES Examples will be shown below, but the present invention is not limited to these examples. The data shown in the examples are measured based on the following method. (1) Izod impact strength (impact resistance) Measured according to JIS K7110. However, the standard in which the thickness of the notched sample was 6.4 mm was adopted. (2) Rigidity (flexural modulus) It was measured according to JIS K-7203. (3) Gloss A 150 × 90 × 2 mm flat plate was formed by an injection molding machine, and the 45 ° glossiness of the central part of the flat plate was measured according to JIS K7105.
It was measured according to.

【0023】ポリブタジエンゴム及び/又はスチレン−
ブタジエングロック共重合体の存在下、スチレンを重合
させた。この際、重合時の攪拌速度、重合温度を調整す
ることにより異なる粒径を有するグラフトタイプのゴム
変性ポリスチレン(比較例A1、B1及びC1)を得
た。一方、ゴム成分を含まない汎用ポリスチレンにゴム
系共重合体粒子として、クレハ化学工業社製の樹脂改質
材であるパラロイドKCA−201(平均粒子径0.1
7μm)を添加混合し、表3のD1に示すゴム変性ポリ
スチレン樹脂を得た。共重合体粒子の混合は、日本製鋼
所製二軸押出機TEX−44を用いて、樹脂温度220
℃、表示回転数900rpm、圧力30kg/cm2
条件で行った。また、以下に示す実施例と比較例は、上
記の比較例A1、B1及びC1のそれぞれと軟質成分粒
子を含まない比較例D1とを混合して得た。結果を表1
〜3に示した。
Polybutadiene rubber and / or styrene-
Styrene was polymerized in the presence of butadiene glock copolymer. At this time, a graft type rubber-modified polystyrene (Comparative Examples A1, B1 and C1) having different particle diameters was obtained by adjusting the stirring speed and the polymerization temperature during the polymerization. On the other hand, a general-purpose polystyrene containing no rubber component is used as a rubber-based copolymer particle, and a resin modifier Paraloid KCA-201 (average particle size 0.1
7 μm) was added and mixed to obtain a rubber-modified polystyrene resin shown in D1 of Table 3. The mixing of the copolymer particles was carried out by using a twin screw extruder TEX-44 manufactured by Japan Steel Works at a resin temperature of 220.
It was carried out under the conditions of a temperature of 900 ° C., a rotation speed of 900 rpm, and a pressure of 30 kg / cm 2 . Further, the following Examples and Comparative Examples were obtained by mixing each of the above Comparative Examples A1, B1 and C1 with Comparative Example D1 containing no soft component particles. The results are shown in Table 1.
~ 3.

【0024】結果から次のことがわかる。実施例A1及
び実施例A2は比較例A1と比較例D1のブレンド物で
あるが、実施例A1及び実施例A2と比較例A1とを比
較すると明らかなとおり、光沢及び剛性をほとんど低下
させることなく、衝撃強度の改良が実現されている。一
方、比較例A2及び比較例A3はX/(X+Y)×10
0の値が過小なものであり、比較例A1に比べて衝撃強
度が逆に低下している。比較例B1及び比較例B2は、
軟質成分粒子の粒子径が過大なものであり、その光沢は
実施例A1及び実施例A2と比較してかなり劣る。比較
例C1、比較例C2及び比較例C3は、軟質成分粒子の
粒子径が過小なものであり、耐衝撃強度の改良効果がほ
とんどみられない。
The results show the following. Example A1 and Example A2 are blends of Comparative Example A1 and Comparative Example D1, but it is clear from comparison between Example A1 and Example A2 and Comparative Example A1 that there is almost no reduction in gloss and rigidity. , Impact strength has been improved. On the other hand, Comparative Examples A2 and A3 have X / (X + Y) × 10.
The value of 0 is too small, and the impact strength is lower than that of Comparative Example A1. Comparative example B1 and comparative example B2
The soft component particles have an excessively large particle diameter, and the gloss thereof is considerably inferior to those of Examples A1 and A2. In Comparative Example C1, Comparative Example C2 and Comparative Example C3, the particle size of the soft component particles is too small, and the effect of improving impact strength is hardly seen.

【0025】[0025]

【表1】 −−−−−−−−−−−−−−−−−−−−−−−−−−−−− 実 施 例 比 較 例 A1 A2 A1 A2 A3 軟質成分粒子 構造 *1 S S S S S 平均粒子径μm 1.2 1.2 1.2 1.2 1.2 X wt% 10.8 13.9 15.4 4.6 7.7 ゴム系共重合体粒子 構造 *1 C C - C C 平均粒子径 0.17 0.17 - 0.17 0.17 Y wt% 5.4 1.8 0 12.6 9.0 X+Y wt% 16.2 15.7 15.4 17.2 16.7 (X/(X+Y)×100) 67.0 88.5 100 26.7 46.1 比A1/ 比D1 70/30 90/10 100/0 30/70 50/50 ブレンド比*2 評価 アイゾット衝撃 強度kg・cm/cm 8.2 7.9 7.5 2.8 4.0 剛性 kg/cm2 24400 24800 25100 23600 24000 光沢 % 91 92 92 90 91 −−−−−−−−−−−−−−−−−−−−−−−−−−−−−[Table 1] −−−−−−−−−−−−−−−−−−−−−−−−−−−−− Practical Example Comparison Comparative Example A1 A2 A1 A2 A3 Soft Component Particle Structure * 1 SSSSS Average particle size μm 1.2 1.2 1.2 1.2 1.2 X wt% 10.8 13.9 15.4 4.6 7.7 Rubber-based copolymer particle structure * 1 CC-CC average particle size 0.17 0.17-0.17 0.17 Y wt% 5.4 1.8 0 12.6 9.0 X + Y wt % 16.2 15.7 15.4 17.2 16.7 (X / (X + Y) × 100) 67.0 88.5 100 26.7 46.1 Ratio A1 / Ratio D1 70/30 90/10 100/0 30/70 50/50 Blend ratio * 2 Evaluation Izod impact strength kg ・ cm / cm 8.2 7.9 7.5 2.8 4.0 Rigidity kg / cm 2 24400 24800 25100 23600 24000 Gloss% 91 92 92 90 91 −−−−−−−−−−−−−−−−−−−−−− −−−−−−

【0026】[0026]

【表2】 [Table 2]

【0027】[0027]

【表3】 −−−−−−−−−−−−−−−−−−−−−−−−−−−− 比 較 例 比較例 C1 C2 C3 D1 軟質成分粒子 構造 *1 C C C - 平均粒子径μm 0.2 0.2 0.2 - X wt% 20.0 6.0 14.0 0 ゴム系共重合体粒子 構造 *1 - C C C 平均粒子径 - 0.17 0.17 0.17 Y wt% 0 12.6 5.4 18.0 X+Y wt% 20.0 18.6 19.4 18.0 (X/(X+Y)×100) 100 32 72 0 比C1/ 比D1 100/0 30/70 70/30 ブレンド比*4 評価 アイゾット衝撃 強度kg・cm/cm 4.5 3.2 4.0 2.4 剛性 kg/cm2 21900 23000 22700 23100 光沢 % 104 94 99 - −−−−−−−−−−−−−−−−−−−−−−−−−−−−Table 3 −−−−−−−−−−−−−−−−−−−−−−−−−−−− Comparative Example Comparative Example Comparative Example C1 C2 C3 D1 Soft Component Particle Structure * 1 CCC-Average Particle size μm 0.2 0.2 0.2-X wt% 20.0 6.0 14.0 0 Rubber-based copolymer particle structure * 1-CCC average particle size-0.17 0.17 0.17 Y wt% 0 12.6 5.4 18.0 X + Y wt% 20.0 18.6 19.4 18.0 (X / (X + Y) × 100) 100 32 72 0 Ratio C1 / Ratio D1 100/0 30/70 70/30 Blend ratio * 4 Evaluation Izod impact strength kg ・ cm / cm 4.5 3.2 4.0 2.4 Rigidity kg / cm 2 21900 23000 22700 23100 Gloss% 104 94 99------------------------------------------

【0028】*1 軟質成分粒子又はゴム系共重合体粒
子の構造 S:サラミ構造 C:コアーシェル構造 ただし、比較例Cシリーズのコア−シェル構造は、コア
部分はポリスチレンからなり、シェル部分はブタジエン
を主成分としたゴム系重合体からなる。また、比較例D
1のコア−シェル構造粒子は、本発明の要件を満足する
ものであった。 *2 比A1/比D1ブレンド比:比較例A1/比較例
D1ブレンド重量比 *3 比B1/比D1ブレンド比:比較例B1/比較例
D1ブレンド重量比 *4 比C1/比D1ブレンド比:比較例C1/比較例
D1ブレンド重量比
* 1 Structure of soft component particles or rubber-based copolymer particles S: salami structure C: core-shell structure However, in the core-shell structure of Comparative Example C series, the core part is made of polystyrene and the shell part is made of butadiene. It consists of a rubber-based polymer as the main component. In addition, Comparative Example D
The core-shell structured particle of No. 1 satisfied the requirements of the present invention. * 2 Ratio A1 / Ratio D1 Blend Ratio: Comparative Example A1 / Comparative Example D1 Blend Weight Ratio * 3 Ratio B1 / Ratio D1 Blend Ratio: Comparative Example B1 / Comparative Example D1 Blend Weight Ratio * 4 Ratio C1 / Ratio D1 Blend Ratio: Comparative Example C1 / Comparative Example D1 Blend Weight Ratio

【0029】[0029]

【発明の効果】以上説明したとおり、本発明により、耐
衝撃性を高め、かつ表面外観に優れたゴム変性ポリスチ
レン系樹脂組成物を提供することができた。
As described above, according to the present invention, it is possible to provide a rubber-modified polystyrene resin composition having improved impact resistance and excellent surface appearance.

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】 マトリックスとしてのスチレン系樹脂
に、軟質成分粒子及びゴム系共重合体粒子が分散したゴ
ム変性ポリスチレン系樹脂組成物であって、下記(a)
〜(c)の条件を充足するゴム変性ポリスチレン系樹脂
組成物。 (a)軟質成分粒子はサラミ構造を有し、その平均粒子
系が0.7μm以上、1.7μm未満であること (b)ゴム系共重合体粒子はコア−シェル構造を有し、
シェル部分はスチレン系単量体及び/又は(メタ)アク
リル酸エステル単量体の重合体を主成分とし、コア部分
はジオレフィン単量体のゴム系重合体を主成分とし、か
つ該ゴム系共重合体粒子の平均粒子径は0.5μm以下
であること (c)ゴム変性ポリスチレン系樹脂組成物中における軟
質成分粒子の重量割合(X重量%)とゴム系共重合体粒
子の重量割合(Y重量%)について、下式(1)及び
(2)の関係が成立すること 5≦(X+Y)≦30 (1) 60≦(X/(X+Y))×100≦99 (2)
1. A rubber-modified polystyrene-based resin composition in which soft component particles and rubber-based copolymer particles are dispersed in a styrene-based resin as a matrix, comprising the following (a):
A rubber-modified polystyrene-based resin composition satisfying the conditions (c) to (c). (A) The soft component particles have a salami structure, and their average particle size is 0.7 μm or more and less than 1.7 μm. (B) The rubber-based copolymer particles have a core-shell structure,
The shell portion contains a polymer of a styrene monomer and / or a (meth) acrylic acid ester monomer as a main component, the core portion contains a rubber polymer of a diolefin monomer as a main component, and the rubber The average particle size of the copolymer particles is 0.5 μm or less. (C) The weight ratio (X% by weight) of the soft component particles in the rubber-modified polystyrene-based resin composition and the weight ratio of the rubber-based copolymer particles ( Y weight%), the relationship of the following formulas (1) and (2) is established: 5 ≦ (X + Y) ≦ 30 (1) 60 ≦ (X / (X + Y)) × 100 ≦ 99 (2)
JP27847292A 1992-10-16 1992-10-16 Rubber-modified polystyrene resin composition Expired - Fee Related JP3198664B2 (en)

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JPH06128339A true JPH06128339A (en) 1994-05-10
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012258A1 (en) * 1996-09-19 1998-03-26 Nippon Steel Chemical Co., Ltd. Flame-retardant styrenic resin composition
WO2000006623A1 (en) * 1998-07-30 2000-02-10 Dainippon Ink And Chemicals, Inc. Styrene resin composition and process for producing the same
KR20030068802A (en) * 2002-02-18 2003-08-25 다이니혼 잉키 가가쿠 고교 가부시키가이샤 Transparent impact-resistant styrene resin composition
EP1661926A1 (en) * 2004-11-30 2006-05-31 The Goodyear Tire & Rubber Company Core-shell particles and rubber composition

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998012258A1 (en) * 1996-09-19 1998-03-26 Nippon Steel Chemical Co., Ltd. Flame-retardant styrenic resin composition
WO2000006623A1 (en) * 1998-07-30 2000-02-10 Dainippon Ink And Chemicals, Inc. Styrene resin composition and process for producing the same
EP1026183A1 (en) * 1998-07-30 2000-08-09 Dainippon Ink And Chemicals, Inc. Styrene resin composition and process for producing the same
US6310148B1 (en) 1998-07-30 2001-10-30 Dainippon Ink And Chemicals, Ltd. Stryrene resin composition and process for producing the same
EP1026183A4 (en) * 1998-07-30 2003-04-02 Dainippon Ink & Chemicals Styrene resin composition and process for producing the same
KR20030068802A (en) * 2002-02-18 2003-08-25 다이니혼 잉키 가가쿠 고교 가부시키가이샤 Transparent impact-resistant styrene resin composition
EP1661926A1 (en) * 2004-11-30 2006-05-31 The Goodyear Tire & Rubber Company Core-shell particles and rubber composition
US7838112B2 (en) 2004-11-30 2010-11-23 The Goodyear Tire & Rubber Company Modified gel particles and rubber composition
US8662125B2 (en) 2004-11-30 2014-03-04 The Goodyear Tire & Rubber Company Modified gel particles and rubber composition

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