JPH09165487A - Injection molded article - Google Patents
Injection molded articleInfo
- Publication number
- JPH09165487A JPH09165487A JP32614195A JP32614195A JPH09165487A JP H09165487 A JPH09165487 A JP H09165487A JP 32614195 A JP32614195 A JP 32614195A JP 32614195 A JP32614195 A JP 32614195A JP H09165487 A JPH09165487 A JP H09165487A
- Authority
- JP
- Japan
- Prior art keywords
- impact
- styrene resin
- resistant styrene
- injection
- injection molded
- 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.)
- Pending
Links
Landscapes
- Injection Moulding Of Plastics Or 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、オーデイオ機器、
ＯＡ機器、ＶＴＲなどのハウジング等に使用される耐衝
撃性スチレン樹脂射出成型品に関する。TECHNICAL FIELD The present invention relates to audio equipment,
The present invention relates to an impact-resistant styrene resin injection molded product used for housings of OA equipment, VTRs and the like.
【０００２】[0002]
【従来の技術とその課題】従来より、熱可塑性樹脂にア
ルミニウム等の金属粒子を配合した樹脂組成物を用いて
メタリック感のある成型品を製造することは行われてき
た。熱可塑性樹脂としては、ＡＢＳ樹脂やポリカーボネ
ート等が主に使用されてきた。2. Description of the Related Art Conventionally, it has been practiced to produce a molded article having a metallic feel by using a resin composition obtained by mixing metal particles such as aluminum with a thermoplastic resin. ABS resins and polycarbonates have been mainly used as the thermoplastic resins.
【０００３】一方、耐衝撃性スチレン樹脂（ゴム変性ス
チレン樹脂）は、成型性および物性バランスに優れ、ま
た安価なことから幅広い用途に使用されている。しかし
従来のメタリック調耐衝撃性スチレン樹脂は、成型品外
観（特にウエルド外観）に問題があり（ウエルドが目立
つ）、満足のいく射出成型品は得られていなかった。す
なわち、外観に優れ安価なメタリック感のある射出成型
品はこれまで得られていなかった。On the other hand, impact-resistant styrene resins (rubber-modified styrene resins) are widely used because of their excellent moldability and physical property balance and their low cost. However, the conventional metallic impact-resistant styrene resin has a problem in the appearance of the molded product (particularly the welded appearance) (the weld is conspicuous), and a satisfactory injection molded product has not been obtained. That is, an injection-molded article having an excellent appearance and a cheap metallic feel has not been obtained so far.
【０００４】[0004]
【課題を解決するための手段】本発明者らはこれらの欠
点を解決する事を目的に鋭意検討した結果、特定の樹脂
組成（モルフォロジー）を有する耐衝撃性スチレン樹脂
に特定量のアルミニウム粒子を配合することにより外観
に優れ安価なメタリック感のある射出成型品を得られる
ことを見出だした。すなわち耐衝撃性スチレン樹脂１０
０重量部と、アルミニウム粒子０．００１〜０．５重量
部、からなる射出成型品において、 ａ）耐衝撃性スチレン樹脂中のゴム粒子の体積平均粒子
径が０．２〜１．２μｍであり ｂ）耐衝撃性スチレン樹脂のメルトインデックスが６〜
２０ｇ／１０分であることを特徴とするウエルド外観に
優れた射出成型品を提供することである。DISCLOSURE OF THE INVENTION As a result of intensive investigations aimed at solving these drawbacks, the present inventors have found that impact-resistant styrene resin having a specific resin composition (morphology) is provided with a specific amount of aluminum particles. It has been found that an injection-molded product having an excellent appearance and a cheap metallic feel can be obtained by blending. That is, impact-resistant styrene resin 10
0 parts by weight and 0.001 to 0.5 parts by weight of aluminum particles, and a) the volume average particle diameter of the rubber particles in the impact-resistant styrene resin is 0.2 to 1.2 μm. b) Impact-resistant styrene resin has a melt index of 6 to
An object of the invention is to provide an injection-molded article having an excellent weld appearance, which is characterized in that it is 20 g / 10 minutes.
【０００５】本発明に用いる耐衝撃性スチレン樹脂は、
ゴム状重合体の存在下にスチレンモノマーを重合せしめ
る塊状重合または塊状懸濁重合法にて製造することがで
きる。本発明で特定されたミクロ構造を有する耐衝撃性
スチレン樹脂は、重合工程における攪拌機の回転数や使
用するゴム状重合体の分子量（粘度）などをコントロー
ルすることにより製造することがきる。その他には、重
合により得られた２種類以上の耐衝撃性スチレン樹脂の
ブレンド或いは、耐衝撃性スチレン樹脂とホモのポリス
チレン樹脂とのブレンドによって製造してもよい。The impact resistant styrene resin used in the present invention is
It can be produced by a bulk polymerization or a bulk suspension polymerization method in which a styrene monomer is polymerized in the presence of a rubbery polymer. The impact-resistant styrene resin having the microstructure specified in the present invention can be produced by controlling the rotation speed of the stirrer in the polymerization step and the molecular weight (viscosity) of the rubber-like polymer used. Alternatively, it may be produced by blending two or more kinds of impact-resistant styrene resins obtained by polymerization, or a blend of impact-resistant styrene resin and homopolystyrene resin.
【０００６】ゴム状重合体としては、ポリブタジエン、
スチレン−ブタジエン共重合体等であり、ポリブタジエ
ンとしてはシス含量の高いハイシスポリブタジエン、シ
ス含量の低いローシスポリブタジエンともに用いること
ができる。As the rubber-like polymer, polybutadiene,
It is a styrene-butadiene copolymer or the like, and as the polybutadiene, both high cis polybutadiene having a high cis content and low cis polybutadiene having a low cis content can be used.
【０００７】本発明の耐衝撃性スチレン樹脂における分
散ゴム相の体積平均ゴム粒子径は、、０．２〜１．２μ
ｍ、さらに好ましくは０．４〜０．８μｍである。体積
平均ゴム粒子径が１．２μｍを越えると、射出成型品の
ウエルドが目立ち易くなり、また０．２μｍより小さい
と射出成型品の強度が低くなり、実用上問題となる。分
散ゴム相の体積平均ゴム粒子径の値は、超薄切片法によ
る切片の透過型電子顕微鏡写真を撮影し、写真中のゴム
相粒子１０００個以上について粒子径を測定し、次式に
より算出できる。The volume average rubber particle diameter of the dispersed rubber phase in the impact resistant styrene resin of the present invention is 0.2 to 1.2 μm.
m, and more preferably 0.4 to 0.8 μm. If the volume average rubber particle diameter exceeds 1.2 μm, the weld of the injection-molded product tends to be conspicuous, and if it is less than 0.2 μm, the strength of the injection-molded product becomes low, which is a practical problem. The value of the volume average rubber particle diameter of the dispersed rubber phase can be calculated by the following formula by taking a transmission electron microscope photograph of a section by an ultrathin section method and measuring the particle diameter of 1000 or more rubber phase particles in the photograph. .
【０００８】 体積平均粒子径＝（ΣｎｉＤｉ4 ）／（ΣｎｉＤｉ3 ） （式中、ｎｉは粒子径Ｄｉの分散ゴム相粒子の個数を示
す。） 本発明の耐衝撃性スチレン樹脂のメルトンデックスは、
６ｇ／１０分以上、好ましくは、９ｇ／１０分以上であ
る。メルトンデックスの測定条件は、ＪＩＳＫ−７２０
６に準拠した、荷重５ｋｇ，温度２００℃である。メル
トンデックスが６未満であるとウエルド外観があまり好
ましくない。２０を越えると成型品の耐熱性あるいは、
実用強度が低くなり好ましくない。発明の耐衝撃性スチ
レン樹脂の分散ゴム相の体積分率（ＲＰＶＦ）は、１０
％〜４０％好ましくは、１５％〜３０％である。１０％
未満であると射出成型品の強度が低くなり、実用上問題
がある。また４０％を越えると射出成型品のウエルドが
目立ち易くなる。Volume average particle size = (ΣniDi 4 ) / (ΣniDi 3 ) (In the formula, ni represents the number of dispersed rubber phase particles having a particle size Di.) Meltondex of the impact-resistant styrene resin of the present invention is
It is 6 g / 10 minutes or more, preferably 9 g / 10 minutes or more. Meltondex measurement conditions are JISK-720
According to 6, the load is 5 kg and the temperature is 200 ° C. If the melton dex is less than 6, the weld appearance is not so preferable. If it exceeds 20, the heat resistance of the molded product or
Practical strength is low, which is not preferable. The volume fraction (RPVF) of the dispersed rubber phase of the impact resistant styrene resin of the invention is 10
% To 40%, preferably 15% to 30%. 10%
If it is less than the above range, the strength of the injection-molded product becomes low, which causes a problem in practical use. On the other hand, if it exceeds 40%, the weld of the injection-molded product tends to stand out.
【０００９】アルミニウム粒子の配合量は、耐衝撃性ス
チレン樹脂１００重量部に対し、０．００１〜０．５重
量部である。好ましくは、０．０５〜０．２重量部であ
る。アルミニウム粒子の配合量は、０．００１未満では
射出成型品にメタリック感がでない。また、０．５重量
部を越えると射出成型品のウエルドが目立ち易くなり好
ましくない。また、金属粒子の平均粒径は５〜１００μ
ｍであり、１０〜７０μｍが好ましく、とりわけ１５〜
４０μｍが好適である。平均粒径が５μｍ未満ではメタ
リック感が得られない。一方、１００μｍを越えるとギ
ラギラした金属感が強く現れ、深みのある色調のものが
得られない。The content of aluminum particles is 0.001 to 0.5 part by weight based on 100 parts by weight of the impact-resistant styrene resin. Preferably, it is 0.05 to 0.2 parts by weight. If the blending amount of aluminum particles is less than 0.001, the injection-molded article does not have a metallic feel. On the other hand, if the amount exceeds 0.5 parts by weight, the weld of the injection-molded product tends to stand out, which is not preferable. The average particle size of the metal particles is 5 to 100 μm.
m, preferably 10 to 70 μm, and more preferably 15 to 70 μm.
40 μm is preferable. If the average particle size is less than 5 μm, a metallic feeling cannot be obtained. On the other hand, when it exceeds 100 μm, a glaring metallic feeling is strongly exhibited and a deep color tone cannot be obtained.
【００１０】本発明の耐衝撃性スチレン樹脂には、必要
に応じて、熱、光、酸素に対する安定剤（例えば、フェ
ノール系化合物、リン系化合物などの酸化防止剤；ベン
ゾトリアゾール系化合物、ベンゾフェノン系化合物、サ
リチル酸フェニル化合物などの紫外線吸収剤；ヒンダー
ドアミン系安定剤や、流動パラフィン、エチレンビスス
テアリルアミド、金属石鹸（ステアリン酸亜鉛、ステア
リン酸マグネシウム、ステアリン酸カルシウム等の滑剤
や離型剤、帯電防止剤、着色剤などの添加剤を添加して
もよい。The impact-resistant styrene resin of the present invention contains, if necessary, stabilizers against heat, light and oxygen (for example, antioxidants such as phenol compounds and phosphorus compounds; benzotriazole compounds and benzophenone compounds). Compounds, UV absorbers such as phenyl salicylate compounds; hindered amine stabilizers, liquid paraffin, ethylenebisstearylamide, metal soaps (zinc stearate, magnesium stearate, calcium stearate, etc., lubricants and mold release agents, antistatic agents, You may add additives, such as a coloring agent.
【００１１】本発明の樹脂射出成型品は、耐衝撃性スチ
レン樹脂にアルミニウム粒子やその他添加剤（着色剤）
を押出成型することにより溶融混練しペレット化したも
のを射出成型することにより製造することができる。ま
た、アルミニウム粒子や着色剤等を高濃度で充填したマ
スターペレットを耐衝撃性スチレン樹脂ペレットとドラ
イブレンドし、直接射出成型することにより、製造して
もよい。The resin injection-molded article of the present invention comprises an impact-resistant styrene resin, aluminum particles and other additives (colorant).
Can be produced by melt-kneading by extrusion-molding and pelletizing. Alternatively, it may be produced by dry-blending a master pellet filled with aluminum particles, a colorant, etc. at a high concentration with an impact-resistant styrene resin pellet, and directly injection-molding.
【００１２】[0012]
【実施例】以下実施例によって本発明を詳しく説明する
が、本発明はこれら実施例によってなんら制限されるも
のでない。The present invention will be described in detail below with reference to examples, but the present invention is not limited to these examples.
【００１３】実施例１〜２、比較例１〜５ 表１に示すようなＨＩＰＳ（耐衝撃性スチレン樹脂）を
用い、表２に示すような配合処方でブレンドし、押出成
型によりペレットを作成した。そのペレットを用い、射
出成機（シリンダー温度２２０℃、金型温度７０℃）に
よりオーデイオフロントパネルを成型した。その成型品
の外観を以下に示すような基準で評価した。 １）メタリック感 目視により、◎（優良）、○（良）、△（若干悪い）、
×（悪い）の４段階で評価した。Examples 1 and 2 and Comparative Examples 1 to 5 HIPS (impact-resistant styrene resin) as shown in Table 1 was used, blended with the compounding formulation as shown in Table 2, and pelletized by extrusion molding. . Using the pellets, an audio front panel was molded by an injection molding machine (cylinder temperature 220 ° C., mold temperature 70 ° C.). The appearance of the molded product was evaluated according to the following criteria. 1) Metallic feeling Visually, ◎ (excellent), ○ (good), △ (somewhat bad),
The evaluation was made in 4 grades of x (bad).
【００１４】２）ウエルド外観評価 目視により、◎（優良）、○（良）、△（若干悪い）、
×（悪い）の４段階で評価した。2) Weld appearance evaluation Visually, ◎ (excellent), ○ (good), △ (slightly bad),
The evaluation was made in 4 grades of x (bad).
【００１５】[0015]
【表１】 [Table 1]
【表２】 [Table 2]
Claims (2)
アルミニウム粒子０．００１〜０．５重量部、からなる
射出成型品において、 ａ）耐衝撃性スチレン樹脂中のゴム粒子の体積平均粒子
径が０．２〜１．２μｍであり ｂ）耐衝撃性スチレン樹脂のメルトインデックスが６〜
２０ｇ／１０分であることを特徴とするウエルド外観に
優れた射出成型品。1. 100 parts by weight of impact-resistant styrene resin,
In an injection-molded product comprising 0.001 to 0.5 parts by weight of aluminum particles, a) Impact resistance The rubber particles in the styrene resin have a volume average particle size of 0.2 to 1.2 μm and b) Impact resistance. Styrene resin has a melt index of 6-
An injection-molded product with an excellent weld appearance, characterized by 20 g / 10 minutes.
積分率（ＲＰＶＦ）が１０〜４０％であることを特徴と
する請求項１記載のウエルド外観に優れた射出成型品。2. An injection-molded article excellent in weld appearance according to claim 1, wherein the volume fraction (RPVF) of the dispersed rubber phase of the impact resistant styrene resin is 10 to 40%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32614195A JPH09165487A (en) | 1995-12-15 | 1995-12-15 | Injection molded article |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP32614195A JPH09165487A (en) | 1995-12-15 | 1995-12-15 | Injection molded article |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH09165487A true JPH09165487A (en) | 1997-06-24 |
Family
ID=18184517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP32614195A Pending JPH09165487A (en) | 1995-12-15 | 1995-12-15 | Injection molded article |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH09165487A (en) |
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US9637630B2 (en) | 2013-02-21 | 2017-05-02 | Samsung Sdi Co., Ltd. | Resin composition and moulded article using same |
| US9790369B2 (en) | 2012-12-31 | 2017-10-17 | Lotte Advanced Materials Co., Ltd. | Composite material and method for preparing composite material |
| JP2017203153A (en) * | 2016-05-06 | 2017-11-16 | キヤノン株式会社 | Thermoplastic resin composition, molded article and manufacturing method of molded article |
| US9944053B2 (en) | 2012-10-24 | 2018-04-17 | Lotte Advanced Materials Co., Ltd. | Laminate sheet, method of manufacturing the laminate sheet, and article using the laminate sheet |
| US10118370B2 (en) | 2012-09-07 | 2018-11-06 | Lotte Advanced Materials Co., Ltd. | Article and manufacturing method of article |
| US10577487B2 (en) | 2016-05-06 | 2020-03-03 | Canon Kabushiki Kaisha | Thermoplastic resin composition, molded article, and manufacturing method of molded article |
-
1995
- 1995-12-15 JP JP32614195A patent/JPH09165487A/en active Pending
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10118370B2 (en) | 2012-09-07 | 2018-11-06 | Lotte Advanced Materials Co., Ltd. | Article and manufacturing method of article |
| US9944053B2 (en) | 2012-10-24 | 2018-04-17 | Lotte Advanced Materials Co., Ltd. | Laminate sheet, method of manufacturing the laminate sheet, and article using the laminate sheet |
| US9790369B2 (en) | 2012-12-31 | 2017-10-17 | Lotte Advanced Materials Co., Ltd. | Composite material and method for preparing composite material |
| US9637630B2 (en) | 2013-02-21 | 2017-05-02 | Samsung Sdi Co., Ltd. | Resin composition and moulded article using same |
| JP2017203153A (en) * | 2016-05-06 | 2017-11-16 | キヤノン株式会社 | Thermoplastic resin composition, molded article and manufacturing method of molded article |
| US10577487B2 (en) | 2016-05-06 | 2020-03-03 | Canon Kabushiki Kaisha | Thermoplastic resin composition, molded article, and manufacturing method of molded article |
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