JP4752141B2 - Resin composition - Google Patents

Resin composition Download PDF

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Publication number
JP4752141B2
JP4752141B2 JP2001185258A JP2001185258A JP4752141B2 JP 4752141 B2 JP4752141 B2 JP 4752141B2 JP 2001185258 A JP2001185258 A JP 2001185258A JP 2001185258 A JP2001185258 A JP 2001185258A JP 4752141 B2 JP4752141 B2 JP 4752141B2
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meth
resin composition
acrylic
polymer
resin
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JP2003003016A (en
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円 古田
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Toagosei Co Ltd
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Toagosei Co Ltd
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Description

【0001】
【発明の属する技術分野】
本発明は、ポリオレフィン系樹脂および無機充填剤を含有する樹脂組成物に関するものである。
【0002】
【従来の技術】
ポリオレフィン系樹脂にタルク、水酸化マグネシウム等の無機充填剤を添加することにより、耐衝撃性や難燃性を向上させる技術は知られている。無機充填剤はポリオレフィン系樹脂と混合されにくいので、脂肪酸やワックスを添加することにより均一分散性を改善することも知られている(特開平9−302099号公報、特開平11−1581号公報)。しかし、この方法は条件によっては均一分散性が不充分な場合があり、使用が制限される。
また、表面処理が施された無機充填剤とポリオレフィンを混合させる方法も知られている(特開2000−63580号公報)。しかし、この方法は、無機充填剤に表面処理を施すための工程が作業性の悪いものであり、大量生産においては生産性が悪い場合がある。
【0003】
【発明が解決しようとする課題】
本発明は、上記のような従来技術の問題点に着目してなされたものである。その目的とするところは、ポリオレフィン系樹脂および無機充填剤を含有する樹脂組成物であって、均一分散性が優れ、生産性が良好なものを提供することにある。
【0004】
【課題を解決するための手段】
上記の目的を達成するために、請求項1に記載の樹脂組成物は、(メタ)アクリル系単量体を含むビニル単量体を180〜350℃の温度で連続重合させて得られる(メタ)アクリル系重合体、ポリオレフィン系樹脂および無機充填剤を含有する樹脂組成物であって、前記(メタ)アクリル系重合体およびポリオレフィン系樹脂の配合量が、無機充填剤100質量部を基準として、それぞれ5〜100質量部および50〜1000質量部であり、前記(メタ)アクリル系重合体の重量平均分子量が、1000〜30000であることを特徴とするものである。請求項に記載の発明は、(メタ)アクリル系単量体を含むビニル単量体を180〜350℃の温度で連続重合させて得られる(メタ)アクリル系重合体、ポリオレフィン系樹脂および無機充填剤を含有する電線被覆用樹脂組成物に関するものである。
【0005】
【発明の実施の形態】
以下、本発明を具体化した実施形態について説明する。
本明細書において、(メタ)アクリルとはアクリルまたはメタクリルを意味する。
【0006】
本発明は、(メタ)アクリル系単量体を含むビニル単量体を180〜350℃の温度で連続重合させて得られる(メタ)アクリル系重合体、ポリオレフィン系樹脂および無機充填剤を含有する樹脂組成物に関するものである。
【0007】
ポリオレフィン系樹脂は、主たる構成単位としてオレフィン単位を有する重合体であり、具体例としてはポリエチレン、低密度ポリエチレン、高密度ポリエチレン、ポリプロピレン、エチレンとプロピレンの共重合体、エチレンとエチレンおよびプロピレン以外のα−オレフィンの共重合体、プロピレンとエチレンおよびプロピレン以外のα−オレフィンの共重合体、エチレンとアクリル酸エステルの共重合体、プロピレンとアクリル酸エステルの共重合体、エチレンと酢酸ビニルの共重合体等が挙げられる。上記ポリオレフィン系樹脂は、その性能を損なわない範囲で、必要に応じてスチレンなど本来の構成単位以外の単量体単位を有するものであってもよい。
【0008】
無機充填剤は、組成物に耐衝撃性や難燃性を付与する働きをする成分である。具体例としては、炭酸カルシウム、タルク、クレー、シリカ、アルミナ、水酸化マグネシウム、水酸化アルミニウム等が挙げられる。
【0009】
本発明の樹脂組成物は、ポリオレフィン系樹脂の割合が、無機充填剤100質量部を基準として30〜2000質量部であるものが好ましく、50〜1000質量部であるものがより好ましい。ポリオレフィン系樹脂の割合が多すぎると耐衝撃性や難燃性が不充分となる場合があり、少なすぎると樹脂組成物の成形性が悪くなる場合がある。
【0010】
本発明に使用される(メタ)アクリル系重合体は樹脂組成物の均一分散性を向上させる成分、すなわち分散剤として機能する成分であり、(メタ)アクリル系単量体を含むビニル単量体を180〜350℃の温度で連続重合させて得られるものである(以下、単に(メタ)アクリル系重合体ともいう。)。ビニル単量体としては、(メタ)アクリル酸メチル、(メタ)アクリル酸エチル、(メタ)アクリル酸プロピル、(メタ)アクリル酸ブチル、(メタ)アクリル酸シクロヘキシル、(メタ)アクリル酸2−エチルへキシル、(メタ)アクリル酸ヒドロキシエチル、(メタ)アクリル酸ヒドロキシプロピル、(メタ)アクリル酸グリシジル等の(メタ)アクリル酸エステル、(メタ)アクリル酸、スチレン、α−メチルスチレン、アクリロニトリルなどが挙げられる。(メタ)アクリル酸エステルまたは(メタ)アクリル酸を主たる構成単量体単位として有する(メタ)アクリル系重合体は、得られる組成物の耐候性を特に優れたものにするために好ましい。
【0011】
メタ)アクリル系単量体を含むビニル単量体は180〜350℃の温度で重合される。200〜320が好ましく、220〜300℃がより好ましい。重合温度が低すぎると得られる(メタ)アクリル系重合体の分子量が大きいものとなり、樹脂組成物が均一に分散されにくく、樹脂組成物の生産性も悪くなる場合がある。低い重合温度において分子量の小さい(メタ)アクリル系重合体を得るために重合開始剤または連鎖移動剤を多量に使用すると、(メタ)アクリル系重合体が着色したり、耐候性の悪いものになったりしやすい。重合温度が高すぎると(メタ)アクリル系重合体が着色しやすくなる。(メタ)アクリル系重合体の重量平均分子量は、1000〜30000が好ましく、1300〜20000がより好ましい。分子量が小さすぎると得られる樹脂組成物が耐熱性の不充分なものとなる場合があり、分子量が大きすぎると樹脂組成物が均一に分散されにくく、樹脂組成物の生産性も悪くなる場合がある。
【0012】
(メタ)アクリル系重合体は、溶液重合、塊状重合等により製造することができる。また、連続重合、セミ連続重合、バッチ重合等の方法で製造することができるが、連続重合、なかでも撹拌槽型反応器を使用する連続重合により製造される(メタ)アクリル系重合体は、樹脂組成物を均一分散させる性能が特に優れるために好ましい。このような連続重合は、公知の方法で行うことができる(特表昭57−502171号公報、特開昭59−6207号公報、特開昭60−215007号公報)。
【0013】
本発明の樹脂組成物は、(メタ)アクリル系重合体の割合が、無機充填剤100質量部を基準として0.1〜200質量部であるものが好ましく、5〜100質量部であるものがより好ましい。(メタ)アクリル系重合体の割合が少なすぎると樹脂組成物の均一分散性が不充分となる場合があり、多すぎると樹脂組成物の成形性が悪くなる場合がある。
【0014】
本発明の樹脂組成物は上記成分を混合することにより得られる。混合方法に特に制限はないが、例えば、(メタ)アクリル系重合体、ポリオレフィン系樹脂及び無機充填剤を配合し、必要に応じて上記の添加剤を添加し、一般的な方法、例えばニーダー、バンバリーミキサー、コンティニアスミキサー又は押し出し機等を用いて混合混練することにより得られる。
【0015】
本発明の樹脂組成物は、種々の成形材料として利用できるが、電線被覆材として特に有用である。電線被覆材用途の場合は、重量平均分子量が1000〜30000の(メタ)アクリル系重合体を使用した樹脂組成物が、上記の特徴に加えて硬度、伸び、絶縁性、耐候性等のバランスが優れたものとなるために好ましい。硬度はショア硬度がA80以上であるものが好ましい。
【0016】
本発明の樹脂組成物は、目的に応じて種々の添加剤が配合されたものであってもよい。例えばサリチラート系、ヒドロキシベンゾアート系、ベンゾトリアゾール系、ヒンダードアミン系等の光安定剤、ヒンダードフェノール系、ホスファイト系、サルファイト系等の酸化防止剤、リン酸エステル等の有機リン系、有機ハロゲン化合物等の難燃剤、陰イオン系界面活性剤、陽イオン系界面活性剤、非イオン系界面活性剤、両性界面活性剤等の帯電防止剤、顔料、抗菌剤、防黴剤、発泡剤、発泡助剤、滑剤等が挙げられる。
【0017】
【実施例】
次に、実施例及び比較例を挙げて前記実施形態をさらに具体的に説明する。なお、以下の各例における「部」は「質量部」を意味する。
【0018】
(メタ)アクリル系重合体の製造例)
(製造例1)伝熱ヒータを備えた容量300mlの加圧式攪拌槽型反応器を、3−エトキシプロピオン酸エチルで満たし、温度230℃にして、圧力調節器により圧力をゲージ圧2.45〜2.65MPa(25〜27kg/cm2)に保った。次いで、反応器の圧力を一定に保ちながら、アクリル酸エチル(以下、EAという。)100部とメチルエチルケトン20部、重合開始剤としてジターシャリブチルパーオキサイド0.5部からなる単量体混合物を、一定の供給速度(23g/分、滞留時間:13分)で原料タンクから反応器に連続供給を開始した。そして、単量体混合物の供給量に相当する反応液を出口から連続的に抜き出した。送液直後に、一旦反応温度が低下した後、重合熱による温度上昇が認められたが、ヒータを制御する事により、反応温度を230℃に維持した。単量体混合物の供給開始後、温度が安定した時点を、反応液の回収開始点とし、これから154分間反応を継続した結果、2000gの単量体混合物を供給し、1950gの反応液を回収した。得られた反応液を薄膜蒸発機に導入した、235℃、4000Pa(30mmHg)の減圧下で、未反応単量体及び溶剤等の揮発性分を除去し、約1500gの液状樹脂である重合体1を得た。
【0019】
ガスクロマトグラフ分析の結果、液状樹脂中の未反応単量体は0.5%以下であった。溶媒として、テトラヒドロフランを使用し、ゲルパーミエーションクロマトグラフ(以下、GPCという。)により求めた分子量をポリスチレン換算した重合体1の重量平均分子量(以下、Mwという。)は1450であった。
【0020】
(製造例2〜4)使用する単量体の組成を表1に示すように変更した以外は上記重合体1の製造方法と同様に操作して重合体2〜4をそれぞれ得た。得られた重合体のMwを表1に示す。表1においてBAはアクリル酸ブチル、MEAはアクリル酸メトキシエチルを表す。
【0021】
【表1】

Figure 0004752141
【0022】
(樹脂組成物の調製と成形性の評価)
(実施例1)オレフィン系樹脂として、エチレン−アクリル酸エチル共重合体(以下、EEAという。日本ポリオレフィン株式会社製ジェイレクスEEA A1150を使用した。)10g、無機充填剤として水酸化マグネシウム(共和化学株式会社製 キスマ5を使用した。)20g及び、無機充填剤の分散剤として0.2gの重合体1をを東洋精機株式会社製ラボプラストミル30C150(混練ロータはR−30を使用した。)に仕込み、200℃、60rpmの回転数で混練を開始した。そして、混練トルクが平衡に達する時間(以下、ゲル化時間という。)及びその時のトルク(以下、平衡トルクという。)を測定した結果、それぞれ0.7分及び10.7N・m(1.09kgf・m)であり、オレフィン系樹脂と無機充填剤が速やかに均一混合され(ゲル化時間が短い)、混練負荷も小さい(平衡トルクが小さい)ことがわかった。すなわち樹脂組成物の生産性が良好であり、得られる樹脂組成物は均一分散性が優れたものとなることがわかった。
【0023】
(実施例2〜4、比較例1〜2)使用する無機充填剤の分散剤を表2に示すように変更し、それ以外は、実施例1に示す方法に準じてゲル化時間及び平衡トルクを測定した。比較例1は分散剤を使用せず、比較例2は分散剤としてステアリン酸を使用した。実施例においては均一混合されやすく、混練負荷も小さいのに対して、比較例においては均一混合されにくく、混練負荷が大きいことがわかった。
【0024】
【表2】
Figure 0004752141
【0025】
(樹脂組成物の調製、成形および評価(引張試験、硬度測定))
(実施例5) EEA100部、20部の重合体2及び水酸化マグネシウム200部を混ぜ、株式会社プラスチック工学研究所製2軸押出機(温度設定:C1=170℃、C2=175℃、C3=180℃、C4=180℃、H=180℃、D=180℃)で混練し、ペレット状の組成物を調製した。
【0026】
その組成物を5インチ、2本テストロールにて、180℃の条件で5分混練した後、190℃の熱プレスにて、シート状の成形物を得た。引張試験用シートは厚さ2mm、ショア硬度用シートは厚さ6mmとした。
【0027】
引張試験は、インストロン株式会社製引張試験機シリーズ5560を使用し、JIS K7161に準じて、ダンベル2号、引張速度10mm/minで実施し、破断伸びを測定した。その結果、伸び率は165%であった。
ショア硬度はJIS K7215に準じ、タイプAデュロメータを用いて実施された。その結果、ショア硬度は88であった。
【0028】
(実施例6及び比較例3)使用する無機充填剤の分散剤を表3に示すように変更し、それ以外は、実施例5に示す方法に準じて引張試験及びショア硬度を測定した。比較例3においては分散剤を使用しなかった。
比較例においては伸び率が小さかった。その理由は樹脂組成物が均一分散性の悪いものであるためと推測している。
【0029】
【表3】
Figure 0004752141
【0030】
(実施例7)ポリプロピレン樹脂(以下、PPという。日本ポリケム株式会社製ノバテックPP FY−4を使用した。)100部、5部の重合体2及びタルク(富士タルク工業株式会社製 タルクPK−50を使用した。)30部を混ぜ、実施例5に示す方法で、引張試験及びショア硬度を測定した。その結果を表4に示す。
【0031】
(比較例4〜5)使用する無機充填剤の分散剤を表4に示すように変更し、それ以外は、実施例7に示す方法に準じて引張試験及びショア硬度を測定した。比較例4は分散剤としてステアリン酸を使用し、比較例5は分散剤を使用しなかった。
比較例においては伸び率が小さかった。その理由は樹脂組成物が均一分散性の悪いものであるためと推測している。
【0032】
【表4】
Figure 0004752141
【0033】
【発明の効果】
ポリオレフィン系樹脂および無機充填剤を含有する樹脂組成物であって、均一分散性が優れ、生産性が良好なものが得られた。均一分散性が優れることにより伸び率が大きいという効果も得られたと考えられる。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a resin composition containing a polyolefin resin and an inorganic filler.
[0002]
[Prior art]
A technique for improving impact resistance and flame retardancy by adding an inorganic filler such as talc or magnesium hydroxide to a polyolefin resin is known. Since inorganic fillers are difficult to be mixed with polyolefin-based resins, it is also known to improve uniform dispersibility by adding fatty acids and waxes (Japanese Patent Laid-Open Nos. 9-302099 and 11-1581). . However, this method may have insufficient uniform dispersibility depending on conditions, and its use is limited.
Also known is a method of mixing a surface-treated inorganic filler and polyolefin (Japanese Patent Laid-Open No. 2000-63580). However, in this method, the process for applying a surface treatment to the inorganic filler has poor workability, and the productivity may be poor in mass production.
[0003]
[Problems to be solved by the invention]
The present invention has been made paying attention to the problems of the prior art as described above. The object is to provide a resin composition containing a polyolefin resin and an inorganic filler, which has excellent uniform dispersibility and good productivity.
[0004]
[Means for Solving the Problems]
In order to achieve the above object, the resin composition according to claim 1 is obtained by continuously polymerizing a vinyl monomer containing a (meth) acrylic monomer at a temperature of 180 to 350 ° C. (meta ) A resin composition containing an acrylic polymer, a polyolefin resin and an inorganic filler , wherein the blending amount of the (meth) acrylic polymer and the polyolefin resin is based on 100 parts by mass of the inorganic filler, They are 5-100 mass parts and 50-1000 mass parts, respectively, The weight average molecular weights of the said (meth) acrylic-type polymer are 1000-30000, It is characterized by the above-mentioned. The invention according to claim 2 is a (meth) acrylic polymer , a polyolefin resin and an inorganic resin obtained by continuously polymerizing a vinyl monomer containing a (meth) acrylic monomer at a temperature of 180 to 350 ° C. The present invention relates to a resin composition for coating an electric wire containing a filler.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments embodying the present invention will be described.
In this specification, (meth) acryl means acryl or methacryl.
[0006]
The present invention contains (meth) obtained by continuous polymerization at a temperature of 180 to 350 ° C. The vinyl monomer containing an acrylic monomer (meth) acrylic polymer, a polyolefin resin and an inorganic filler The present invention relates to a resin composition.
[0007]
The polyolefin resin is a polymer having an olefin unit as a main constituent unit. Specific examples thereof include polyethylene, low density polyethylene, high density polyethylene, polypropylene, a copolymer of ethylene and propylene, and α other than ethylene, ethylene, and propylene. -Olefin copolymer, Copolymer of propylene and ethylene and α-olefin other than propylene, Copolymer of ethylene and acrylate ester, Copolymer of propylene and acrylate ester, Copolymer of ethylene and vinyl acetate Etc. The polyolefin-based resin may have a monomer unit other than the original structural unit such as styrene, if necessary, as long as the performance is not impaired.
[0008]
The inorganic filler is a component that functions to impart impact resistance and flame retardancy to the composition. Specific examples include calcium carbonate, talc, clay, silica, alumina, magnesium hydroxide, aluminum hydroxide and the like.
[0009]
In the resin composition of the present invention, the proportion of the polyolefin-based resin is preferably 30 to 2000 parts by mass based on 100 parts by mass of the inorganic filler, and more preferably 50 to 1000 parts by mass. If the proportion of the polyolefin resin is too large, the impact resistance and flame retardancy may be insufficient, and if it is too small, the moldability of the resin composition may be deteriorated.
[0010]
The (meth) acrylic polymer used in the present invention is a component that improves the uniform dispersibility of the resin composition, that is, a component that functions as a dispersant, and a vinyl monomer containing a (meth) acrylic monomer Is obtained by continuous polymerization at a temperature of 180 to 350 ° C. (hereinafter also simply referred to as a (meth) acrylic polymer ). Examples of vinyl monomers include methyl (meth) acrylate, ethyl (meth) acrylate, propyl (meth) acrylate, butyl (meth) acrylate, cyclohexyl (meth) acrylate, and 2-ethyl (meth) acrylate. (Meth) acrylic acid esters such as hexyl, hydroxyethyl (meth) acrylate, hydroxypropyl (meth) acrylate, glycidyl (meth) acrylate, (meth) acrylic acid, styrene, α-methylstyrene, acrylonitrile, etc. Can be mentioned. A (meth) acrylic polymer having (meth) acrylic acid ester or (meth) acrylic acid as a main constituent monomer unit is preferred in order to make the resulting composition particularly excellent in weather resistance.
[0011]
A vinyl monomer containing a (meth) acrylic monomer is polymerized at a temperature of 180 to 350 ° C. 200-320 are preferable and 220-300 degreeC is more preferable. When the polymerization temperature is too low, the molecular weight of the (meth) acrylic polymer obtained becomes large, the resin composition is difficult to be uniformly dispersed, and the productivity of the resin composition may be deteriorated. Small molecular weight (meth) when used in a large amount of a polymerization initiator or a chain transfer agent in order to obtain the acrylic polymer at lower polymerization temperatures, becomes (meth) colored or acrylic polymer, poor weatherability It is easy to do. If the polymerization temperature is too high, the (meth) acrylic polymer tends to be colored. 1000-30000 is preferable and, as for the weight average molecular weight of a (meth) acrylic-type polymer , 1300-20000 is more preferable. If the molecular weight is too small, the resulting resin composition may be insufficient in heat resistance, and if the molecular weight is too large, the resin composition may not be uniformly dispersed, and the productivity of the resin composition may deteriorate. is there.
[0012]
The (meth) acrylic polymer can be produced by solution polymerization, bulk polymerization, or the like. Moreover, although it can manufacture by methods, such as continuous polymerization, semi-continuous polymerization, and batch polymerization, (meth) acrylic-type polymer manufactured by continuous polymerization, especially continuous polymerization using a stirred tank reactor, This is preferable because the performance of uniformly dispersing the resin composition is particularly excellent. Such continuous polymerization can be carried out by a known method (Japanese Patent Publication No. 57-502171, Japanese Patent Publication No. 59-6207, Japanese Patent Publication No. 60-215007).
[0013]
In the resin composition of the present invention, the proportion of the (meth) acrylic polymer is preferably 0.1 to 200 parts by mass, and 5 to 100 parts by mass based on 100 parts by mass of the inorganic filler. More preferred. If the proportion of the (meth) acrylic polymer is too small, the uniform dispersibility of the resin composition may be insufficient, and if it is too large, the moldability of the resin composition may be deteriorated.
[0014]
The resin composition of the present invention can be obtained by mixing the above components. The mixing method is not particularly limited. For example, a (meth) acrylic polymer , a polyolefin resin, and an inorganic filler are blended, and the above additives are added as necessary. It can be obtained by mixing and kneading using a Banbury mixer, a continuous mixer or an extruder.
[0015]
The resin composition of the present invention can be used as various molding materials, but is particularly useful as a wire coating material. In the case of wire coating materials, a resin composition using a (meth) acrylic polymer having a weight average molecular weight of 1000 to 30000 has a balance of hardness, elongation, insulation, weather resistance, etc. in addition to the above characteristics. It is preferable because it is excellent. The hardness is preferably a Shore hardness of A80 or higher.
[0016]
The resin composition of the present invention may be formulated with various additives according to the purpose. For example, light stabilizers such as salicylate, hydroxybenzoate, benzotriazole, and hindered amines, antioxidants such as hindered phenols, phosphites, and sulfites, organic phosphoruss such as phosphate esters, and organic halogens Flame retardants such as compounds, anionic surfactants, cationic surfactants, nonionic surfactants, antistatic agents such as amphoteric surfactants, pigments, antibacterial agents, antifungal agents, foaming agents, foaming Auxiliaries, lubricants and the like can be mentioned.
[0017]
【Example】
Next, the embodiment will be described more specifically with reference to examples and comparative examples. In the following examples, “part” means “part by mass”.
[0018]
(Production example of (meth) acrylic polymer )
(Production Example 1) A 300 ml capacity pressurized stirred tank reactor equipped with a heat transfer heater was filled with ethyl 3-ethoxypropionate at a temperature of 230 ° C., and the pressure was adjusted to a gauge pressure of 2.45 to 2.45. The pressure was kept at 2.65 MPa (25 to 27 kg / cm 2 ). Next, while keeping the pressure of the reactor constant, a monomer mixture consisting of 100 parts of ethyl acrylate (hereinafter referred to as EA), 20 parts of methyl ethyl ketone, and 0.5 part of ditertiary butyl peroxide as a polymerization initiator, Continuous supply from the raw material tank to the reactor was started at a constant supply rate (23 g / min, residence time: 13 minutes). And the reaction liquid equivalent to the supply amount of a monomer mixture was continuously extracted from the exit. Immediately after the feeding, after the reaction temperature was once lowered, a temperature increase due to the heat of polymerization was observed, but the reaction temperature was maintained at 230 ° C. by controlling the heater. The time when the temperature was stabilized after the start of the supply of the monomer mixture was taken as the start point of the reaction liquid recovery, and the reaction was continued for 154 minutes. As a result, 2000 g of the monomer mixture was supplied and 1950 g of the reaction liquid was recovered. . The obtained reaction liquid was introduced into a thin film evaporator, and volatile components such as unreacted monomers and solvents were removed under reduced pressure at 235 ° C. and 4000 Pa (30 mmHg) to obtain about 1500 g of a liquid resin. 1 was obtained.
[0019]
As a result of gas chromatographic analysis, the unreacted monomer in the liquid resin was 0.5% or less. Tetrahydrofuran was used as a solvent, and the weight average molecular weight (hereinafter referred to as Mw) of the polymer 1 obtained by converting the molecular weight determined by gel permeation chromatography (hereinafter referred to as GPC) into polystyrene was 1450.
[0020]
(Production Examples 2 to 4) Polymers 2 to 4 were obtained in the same manner as in Polymer 1 except that the composition of the monomers used was changed as shown in Table 1. Table 1 shows the Mw of the obtained polymer. In Table 1, BA represents butyl acrylate and MEA represents methoxyethyl acrylate.
[0021]
[Table 1]
Figure 0004752141
[0022]
(Preparation of resin composition and evaluation of moldability)
(Example 1) 10 g of an ethylene-ethyl acrylate copolymer (hereinafter referred to as EEA; J-Rex EEA A1150 manufactured by Nippon Polyolefin Co., Ltd. was used) as an olefin resin, and magnesium hydroxide (Kyowa Chemical Co., Ltd.) as an inorganic filler. Kisuma 5 manufactured by company was used.) 20 g and 0.2 g of polymer 1 as a dispersant for inorganic filler were added to Laboplast Mill 30C150 manufactured by Toyo Seiki Co., Ltd. (R-30 was used as the kneading rotor). The kneading was started at 200 ° C. and 60 rpm. As a result of measuring the time for the kneading torque to reach equilibrium (hereinafter referred to as gelation time) and the torque at that time (hereinafter referred to as equilibrium torque), 0.7 minutes and 10.7 N · m (1.09 kgf) were obtained, respectively. M), it was found that the olefin resin and the inorganic filler were rapidly and uniformly mixed (the gel time was short), and the kneading load was small (the equilibrium torque was small). That is, it was found that the productivity of the resin composition was good, and the resulting resin composition had excellent uniform dispersibility.
[0023]
(Examples 2 to 4, Comparative Examples 1 and 2) The inorganic filler dispersant used was changed as shown in Table 2, and the gelation time and equilibrium torque were otherwise changed in accordance with the method shown in Example 1. Was measured. Comparative Example 1 did not use a dispersant, and Comparative Example 2 used stearic acid as a dispersant. In the examples, it was found that uniform mixing was easy and the kneading load was small, whereas in the comparative example, uniform mixing was difficult and the kneading load was large.
[0024]
[Table 2]
Figure 0004752141
[0025]
(Preparation, molding and evaluation of resin composition (tensile test, hardness measurement))
(Example 5) 100 parts of EEA, 20 parts of polymer 2 and 200 parts of magnesium hydroxide were mixed and a twin-screw extruder manufactured by Plastic Engineering Laboratory Co., Ltd. (temperature setting: C1 = 170 ° C., C2 = 175 ° C., C3 = 180 ° C., C 4 = 180 ° C., H = 180 ° C., D = 180 ° C.) to prepare a pellet-shaped composition.
[0026]
The composition was kneaded for 5 minutes under the condition of 180 ° C. with 5 inches and two test rolls, and then a sheet-like molded product was obtained by hot pressing at 190 ° C. The tensile test sheet was 2 mm thick, and the shore hardness sheet was 6 mm thick.
[0027]
The tensile test was carried out using a tensile tester series 5560 manufactured by Instron Co., Ltd. according to JIS K7161, with dumbbell No. 2 and a tensile speed of 10 mm / min, and the elongation at break was measured. As a result, the elongation was 165%.
The Shore hardness was measured according to JIS K7215 using a type A durometer. As a result, the Shore hardness was 88.
[0028]
(Example 6 and Comparative Example 3) The inorganic filler dispersant used was changed as shown in Table 3, and the tensile test and Shore hardness were measured according to the method shown in Example 5 except that. In Comparative Example 3, no dispersant was used.
In the comparative example, the elongation was small. The reason is presumed that the resin composition has poor uniform dispersibility.
[0029]
[Table 3]
Figure 0004752141
[0030]
(Example 7) Polypropylene resin (hereinafter referred to as PP; Novatec PP FY-4 manufactured by Nippon Polychem Co., Ltd. was used) 100 parts, 5 parts of polymer 2 and talc (Talc PK-50 manufactured by Fuji Talc Industrial Co., Ltd.) 30 parts were mixed and the tensile test and Shore hardness were measured by the method shown in Example 5. The results are shown in Table 4.
[0031]
(Comparative Examples 4 to 5) The dispersant for the inorganic filler used was changed as shown in Table 4, and the tensile test and Shore hardness were measured in the same manner as in Example 7 except that. Comparative Example 4 used stearic acid as a dispersant, and Comparative Example 5 did not use a dispersant.
In the comparative example, the elongation was small. The reason is presumed that the resin composition has poor uniform dispersibility.
[0032]
[Table 4]
Figure 0004752141
[0033]
【The invention's effect】
A resin composition containing a polyolefin-based resin and an inorganic filler, which was excellent in uniform dispersibility and good productivity, was obtained. It is considered that the effect of high elongation was obtained due to excellent uniform dispersibility.

Claims (2)

(メタ)アクリル系単量体を含むビニル単量体を180〜350℃の温度で連続重合させて得られる(メタ)アクリル系重合体、ポリオレフィン系樹脂および無機充填剤を含有する樹脂組成物であって、前記(メタ)アクリル系重合体およびポリオレフィン系樹脂の配合量が、無機充填剤100質量部を基準として、それぞれ5〜100質量部および50〜1000質量部であり、前記(メタ)アクリル系重合体の重量平均分子量が、1000〜30000であることを特徴とする樹脂組成物。 (Meth) obtained by continuous polymerization at a temperature of 180 to 350 ° C. The vinyl monomer containing an acrylic monomer (meth) acrylic polymer, a resin composition containing a polyolefin resin and an inorganic filler And the compounding quantity of the said (meth) acrylic-type polymer and polyolefin resin is 5-100 mass parts and 50-1000 mass parts, respectively on the basis of 100 mass parts of inorganic fillers, The said (meth) acrylic The resin composition, wherein the weight average molecular weight of the polymer is 1000 to 30000. (メタ)アクリル系単量体を含むビニル単量体を180〜350℃の温度で連続重合させて得られる(メタ)アクリル系重合体、ポリオレフィン系樹脂および無機充填剤を含有する電線被覆用樹脂組成物であって、前記(メタ)アクリル系重合体およびポリオレフィン系樹脂の配合量が、無機充填剤100質量部を基準として、それぞれ5〜100質量部および50〜1000質量部であり、前記(メタ)アクリル系重合体の重量平均分子量が、1000〜30000であることを特徴とする電線被覆用樹脂組成物。 Electric wire coating resin containing (meth) acrylic polymer , polyolefin resin and inorganic filler obtained by continuously polymerizing vinyl monomer containing (meth) acrylic monomer at a temperature of 180 to 350 ° C. It is a composition , Comprising: The compounding quantity of the said (meth) acrylic-type polymer and polyolefin resin is 5-100 mass parts and 50-1000 mass parts, respectively on the basis of 100 mass parts of inorganic fillers, The resin composition for electric wire coating | cover characterized by the weight average molecular weights of a meth) acrylic polymer being 1000-30000.
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