JPH0892438A - Resin composition for extrusion - Google Patents

Resin composition for extrusion

Info

Publication number
JPH0892438A
JPH0892438A JP6225289A JP22528994A JPH0892438A JP H0892438 A JPH0892438 A JP H0892438A JP 6225289 A JP6225289 A JP 6225289A JP 22528994 A JP22528994 A JP 22528994A JP H0892438 A JPH0892438 A JP H0892438A
Authority
JP
Japan
Prior art keywords
density
weight
linear low
density polyethylene
component
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
JP6225289A
Other languages
Japanese (ja)
Other versions
JP3366461B2 (en
Inventor
Kazumasa Fujimura
村 和 昌 藤
Takashi Furukawa
川 孝 古
Kimiaki Kurumi
仁 朗 久留美
Hitoshi Inagaki
垣 均 稲
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.)
Mitsubishi Chemical Corp
Original Assignee
Mitsubishi Chemical Corp
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 Mitsubishi Chemical Corp filed Critical Mitsubishi Chemical Corp
Priority to JP22528994A priority Critical patent/JP3366461B2/en
Publication of JPH0892438A publication Critical patent/JPH0892438A/en
Application granted granted Critical
Publication of JP3366461B2 publication Critical patent/JP3366461B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Abstract

PURPOSE: To obtain a resin compsn. for extrusion which gives an extrudate improved in the strengths of the part where two resin flows have joined each other in a die in extrusion blow molding or in pipe extrusion. CONSTITUTION: This resin compsn. comprises 60-95 pts.wt. propylene polymer having an MFR of 0.1-5g/10min and a density of 0.890-0.915g/cm<3> , 5-30 pts.wt. linear low-density polyethylene having an MFR of 0.1-10g/10min, a density of 0.910-0.935g/cm<3> , and a Q value of 5 or higher, and 1-15 pts.wt. ethylene-α- olefin copolymer elastomer having an MFR of 0.1-10g/10min and a density of 0.840-0.900g/cm<3> .

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、ブロー、パイプ等の押
出成形におけるダイ内の樹脂の合流部分(ウエルド)の
強度が著しく改良された、プロピレン重合体を主成分と
する押出成形用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 an extrusion molding resin composition containing a propylene polymer as a main component, in which the strength of a resin joining portion (weld) in a die in extrusion molding of blow, pipe or the like is remarkably improved. It is about things.

【0002】[0002]

【従来の技術】プロピレン重合体は、優れた耐熱性、機
械的特性、化学的な安定性等を兼ね備えた汎用樹脂であ
ることから、これらの物理的・化学的性質を利用して、
ブロー、パイプ等の押出成形用樹脂としても広く使用さ
れている。しかし、該プロピレン重合体の欠点として
は、一般に低温衝撃性の不足が挙げられており、従来よ
り、この様な欠点を解決すべく、ガラス転移温度の低い
ポリエチレンや軟質エラストマーを配合したプロピレン
重合体組成物が知られ、これを中空成形用素材として採
用することも行なわれている。
2. Description of the Related Art Propylene polymers are general-purpose resins having excellent heat resistance, mechanical properties, chemical stability, etc., and therefore, by utilizing these physical and chemical properties,
It is widely used as a resin for extrusion molding of blows and pipes. However, as a drawback of the propylene polymer, lack of low-temperature impact resistance is generally mentioned, and conventionally, in order to solve such a drawback, a propylene polymer in which polyethylene having a low glass transition temperature or a soft elastomer is blended. A composition is known, and it is also used as a material for blow molding.

【0003】[0003]

【発明が解決しようとする課題】そして、上記プロピレ
ン重合体に配合するポリエチレンとしては、従来の長鎖
分岐を有する高圧法低密度ポリエチレンよりも、直鎖状
低密度ポリエチレンを配合させる方が、プロピレン重合
体の低温耐衝撃性を向上させることができることが提案
された。具体的には、特公昭64−11062号公報に
は、 [a] アイソタクチックポリプロピレン 50〜97重量% [b] 弾性体 2〜49重量% [c] エチレンとα−オレフィンを圧力4・16Pa以下、チーグラー型触媒系の 存在下に共重合して得られた線状低密度ポリエチレン 1〜25重量% を含むバンパー等の自動車部品として用いられる高耐衝
撃性ポリプロピレン組成物が、また、特公平5−882
64号公報には、 [x] 密度0.90〜0.91g/cm3 、MFR0.1〜3.0g/10分(1 90℃、2160g)のポリプロピレン樹脂 70〜85重量部 [y] 密度0.915〜0.935g/cm3 、MFR0.1〜10g/10分の 直鎖低密度ポリエチレン 5〜20重量部 [z] 密度0.87〜0.89g/cm3 、MFR0.1〜40g/10分のエチ レン・炭素数3以上のオレフィン共重合体軟質エラストマー2〜20重量部 をブレンドしてなるポリプロピレン組成物から成形した
低温耐衝撃性に優れた中空瓶が記載されている。
As the polyethylene to be blended with the propylene polymer, it is better to blend a linear low-density polyethylene than a conventional high-pressure low-density polyethylene having a long-chain branch. It has been proposed that the low temperature impact resistance of polymers can be improved. Specifically, Japanese Patent Publication No. 64-11062 discloses [a] isotactic polypropylene 50 to 97 wt% [b] elastic body 2 to 49 wt% [c] ethylene and α-olefin at a pressure of 4.16 Pa. Hereinafter, a high impact polypropylene composition used as an automobile part such as a bumper containing 1 to 25% by weight of a linear low density polyethylene obtained by copolymerizing in the presence of a Ziegler type catalyst system is also disclosed. 5-882
No. 64 discloses a polypropylene resin having [x] density of 0.90 to 0.91 g / cm 3 and MFR of 0.1 to 3.0 g / 10 minutes (190 ° C., 2160 g) 70 to 85 parts by weight [y] density 0.915~0.935g / cm 3, linear low density polyethylene 5-20 parts by weight of MFR0.1~10g / 10 min [z] density 0.87~0.89g / cm 3, MFR0.1~40g A hollow bottle having excellent low-temperature impact resistance formed from a polypropylene composition obtained by blending 2 to 20 parts by weight of an olefin copolymer soft elastomer having an ethylene / carbon number of 3 or more per 10 minutes is described.

【0004】しかしながら、上記バンパー等の自動車部
品用の高耐衝撃性ポリプロピレン組成物や、上記ポリプ
ロピレン組成物から成形した中空瓶は、いずれも低温耐
衝撃性に優れたものであるが、上記[c] 成分の線状低密
度ポリエチレンや、[y] 成分の直鎖低密度ポリエチレン
がいずれもチーグラー型触媒を用いて製造された直鎖低
密度ポリエチレンが用いられている。それ故、高耐衝撃
性や低温耐衝撃性についての改良効果は良好であるが、
これらチーグラー型触媒を用いて製造された直鎖低密度
ポリエチレンは、分子量分布が狭い(Q値が大きくても
3.5程度のもの)ため、押出成形におけるダイ内での
樹脂の流れが他の流れと合流して押し出されて成形され
る成形体の場合には、該押出成形時にダイ内にプロピレ
ン重合体樹脂の合流部分(ウエルド)が生じて、この合
流部分(ウエルド)の成形体の強度が著しく悪化すると
の問題が発生する。特に、この様なチーグラー型触媒を
用いて製造された直鎖低密度ポリエチレンを配合したプ
ロピレン重合体の樹脂組成物では、これをブロー、パイ
プ等の押出成形機にて成形すると、これらの成形方法の
特徴であるダイ内でのプロピレン重合体樹脂の合流部分
(ウエルド)での接着が著しく悪化するため、得られる
プロピレン重合体の樹脂製品の胴部に肉厚の薄い部分が
発生して、得られる成形体樹脂製品の強度を著しく低下
させる。
However, the high-impact polypropylene compositions for automobile parts such as bumpers and the hollow bottles molded from the polypropylene compositions are excellent in low-temperature impact resistance. The linear low density polyethylene as the component] and the linear low density polyethylene as the component [y] are both linear low density polyethylene produced by using a Ziegler type catalyst. Therefore, although the effect of improving high impact resistance and low temperature impact resistance is good,
The linear low-density polyethylene produced by using these Ziegler type catalysts has a narrow molecular weight distribution (having a Q value as large as about 3.5), so that the resin flow in the die during extrusion molding may be different. In the case of a molded product that is formed by being joined with a flow and extruded, a merging part (weld) of the propylene polymer resin is generated in the die during the extrusion molding, and the strength of the molded product at this merging part (weld) is increased. Will significantly deteriorate, and a problem will occur. Particularly, in a resin composition of a propylene polymer containing a linear low-density polyethylene produced by using such a Ziegler type catalyst, when this is molded by an extruder such as a blow or pipe, these molding methods Since the adhesion of the propylene polymer resin in the die at the confluence part (weld) in the die, which is a feature of, significantly deteriorates, a thin wall part is generated in the body of the resulting propylene polymer resin product, It significantly reduces the strength of the molded resin product.

【0005】[0005]

【課題を解決するための手段】[Means for Solving the Problems]

[発明の概要]本発明者らは、上記課題に鑑みて鋭意研
究を重ねた結果、特定な物性のプロピレン重合体に特定
の物性の直鎖状低密度ポリエチレンを配合することによ
って、押出成形時におけるダイ内でのプロピレン重合体
樹脂の合流部分(ウエルド)での接着強度を著しく改良
することができるとの知見に基づき本発明を完成するに
至ったものである。すなわち、本発明の押出成形用樹脂
組成物は、下記の成分(A)〜成分(C)からなること
を特徴とするものである。 成分(A):メルトフローレート(230℃、2.16kg荷重)が0.1〜5 g/10分、密度が0.890〜0.915g/cm3 のプロピレン重合体 60〜95重量部 成分(B):メルトフローレート(190℃、2.16kg荷重)が0.1〜1 0g/10分、密度が0.910〜0.935g/cm3 、重量平均分子量と数 平均分子量の比(Q値)が5以上の直鎖状低密度ポリエチレン 5〜30重量部 成分(C):メルトフローレート(230℃、2.16kg荷重)が0.1〜1 0g/10分、密度が0.840〜0.900g/cm3 のエチレンと炭素数が 3以上のα−オレフィンとの共重合体エラストマー 1〜15重量部
[Summary of the Invention] As a result of intensive studies conducted by the present inventors in view of the above-mentioned problems, as a result of blending a linear low-density polyethylene having specific physical properties with a propylene polymer having specific physical properties during extrusion molding. The present invention has been completed based on the finding that the adhesive strength at the merging portion (weld) of the propylene polymer resin in the die can be remarkably improved. That is, the resin composition for extrusion molding of the present invention is characterized by comprising the following components (A) to (C). Component (A): Propylene polymer having a melt flow rate (230 ° C., 2.16 kg load) of 0.1 to 5 g / 10 minutes and a density of 0.890 to 0.915 g / cm 3 60 to 95 parts by weight Component (B): Melt flow rate (190 ° C., 2.16 kg load) 0.1 to 10 g / 10 minutes, density 0.910 to 0.935 g / cm 3 , ratio of weight average molecular weight to number average molecular weight ( Linear low density polyethylene having a Q value of 5 or more 5 to 30 parts by weight Component (C): Melt flow rate (230 ° C., 2.16 kg load) 0.1 to 10 g / 10 minutes, density 0. Copolymer elastomer of 840 to 0.900 g / cm 3 of ethylene and α-olefin having 3 or more carbon atoms 1 to 15 parts by weight

【0006】[発明の具体的説明] [I] 構成成分 (1) プロピレン重合体(成分(A)の樹脂) 本発明の押出成形用樹脂組成物において用いられる成分
(A)のプロピレン重合体としては、JIS−K721
0(230℃、2.16kg荷重)により測定したメル
トフローレート(MFR)が0.1〜5g/10分、好
ましくは0.3〜3g/10分、特に好ましくは0.5
〜2g/10分で、しかも、JIS−K7112により
測定した密度が0.890〜0.915g/cm3 、好
ましくは0.895〜0.910g/cm3 、特に好ま
しくは0.900〜0.908g/cm3 の範囲内の物
性値を示すものである。具体的には、プロピレン単独重
合体、若しくは、プロピレンと5重量%以下、好ましく
は0.1〜4重量%のエチレン等の他のα−オレフィン
(好ましくは炭素数2〜8のα−オレフィン)との共重
合体及びそれらの混合物等を挙げることができる。これ
らの中でもプロピレン単独重合体又はランダム共重合体
を用いることが好ましい。上記成分(A)のプロピレン
重合体のMFRが上記範囲未満の場合は、押出成形時の
押出量が低下する。一方、プロピレン重合体のMFRが
上記範囲を超える場合は、押出成形時のドローダウンが
発生する。上記成分(A)のプロピレン重合体の密度が
上記範囲未満の場合は、成形品の剛性が低下する。一
方、プロピレン重合体の密度が上記範囲を超える場合
は、成形品の耐衝撃強度が低下する。
[Detailed Description of the Invention] [I] Constituent Component (1) Propylene Polymer (Resin of Component (A)) As a propylene polymer of the component (A) used in the resin composition for extrusion molding of the present invention. Is JIS-K721
0 (230 ° C, 2.16 kg load) has a melt flow rate (MFR) of 0.1 to 5 g / 10 minutes, preferably 0.3 to 3 g / 10 minutes, particularly preferably 0.5.
˜2 g / 10 min, and the density measured according to JIS-K7112 is 0.890 to 0.915 g / cm 3 , preferably 0.895 to 0.910 g / cm 3 , and particularly preferably 0.900 to 0. It shows a physical property value within the range of 908 g / cm 3 . Specifically, propylene homopolymer or other α-olefin such as propylene and 5% by weight or less, preferably 0.1 to 4% by weight (preferably α-olefin having 2 to 8 carbon atoms) such as ethylene. Examples thereof include copolymers with and mixtures thereof. Among these, it is preferable to use a propylene homopolymer or a random copolymer. When the MFR of the propylene polymer as the component (A) is less than the above range, the extrusion rate at the time of extrusion molding decreases. On the other hand, when the MFR of the propylene polymer exceeds the above range, drawdown occurs during extrusion molding. When the density of the propylene polymer of the above component (A) is less than the above range, the rigidity of the molded article is reduced. On the other hand, when the density of the propylene polymer exceeds the above range, the impact resistance of the molded product decreases.

【0007】(2) 直鎖状低密度ポリエチレン 本発明の押出成形用樹脂組成物において用いられる直鎖
状低密度ポリエチレンとしては、JIS−K7210
(190℃、2.16kg荷重)により測定したメルト
フローレート(MFR)が0.1〜10g/10分、好
ましくは0.3〜5g/10分、特に好ましくは0.5
〜3g/10分で、しかも、JIS−K7112により
測定した密度が0.910〜0.935g/cm3 、好
ましくは0.915〜0.930g/cm3 、特に好ま
しくは0.917〜0.927g/cm3 で、かつ、ゲ
ルパーミェーションクロマトグラフにより測定した重量
平均分子量と数平均分子量の比(Q値)が5以上、好ま
しくは6以上、特に好ましくは6〜9の物性を有するも
のである。具体的には、エチレンと炭素数が4以上、好
ましくは4〜9のα−オレフィン、例えば、ブテン−
1、ペンテン−1、4−メチルペンテン−1、ヘキセン
−1、2−メチルブテン−1、オクテン−1等との共重
合体からなる直鎖状低密度ポリエチレンを挙げることが
できる。
(2) Linear low-density polyethylene As the linear low-density polyethylene used in the resin composition for extrusion molding of the present invention, JIS-K7210 is used.
Melt flow rate (MFR) measured by (190 ° C., 2.16 kg load) is 0.1 to 10 g / 10 minutes, preferably 0.3 to 5 g / 10 minutes, particularly preferably 0.5.
˜3 g / 10 min, and the density measured by JIS-K7112 is 0.910 to 0.935 g / cm 3 , preferably 0.915 to 0.930 g / cm 3 , and particularly preferably 0.917 to 0. It has a physical property of 927 g / cm 3 and a ratio (Q value) of the weight average molecular weight to the number average molecular weight measured by gel permeation chromatography of 5 or more, preferably 6 or more, particularly preferably 6 to 9. It is a thing. Specifically, ethylene and an α-olefin having 4 or more carbon atoms, preferably 4 to 9, such as butene-
A linear low-density polyethylene composed of a copolymer with 1, pentene-1, 4-methylpentene-1, hexene-1, 2-methylbutene-1, octene-1 and the like can be mentioned.

【0008】特に本発明の効果を大きく奏することがで
きる好適な直鎖状低密度ポリエチレンとしては、酸化ク
ロムをシリカ・アルミナ等の無機担体等に担持させたも
の、すなわち、酸化クロム系フィリップス型触媒を用い
て、気相法、溶液法、スラリー法による、或いは、50
0kg/cm2 以上の重合圧力及び100〜350℃の
重合温度の条件下で重合される高圧イオン重合法による
製造プロセス等を適用して、エチレンと炭素数が4以上
のα−オレフィンとを共重合して得られる直鎖状低密度
ポリエチレンを挙げることができる。特に気相法による
製造プロセス等を適用して得られる直鎖状低密度ポリエ
チレンを用いることが好適である。直鎖状低密度ポリエ
チレンのMFRが上記範囲未満の場合は、樹脂中で分散
状態が不良となり透明性が悪化する。一方、直鎖状低密
度ポリエチレンのMFRが上記範囲を超える場合は、耐
衝撃強度が低下する。また、直鎖状低密度ポリエチレン
の密度が上記範囲未満の場合は、成形品の剛性が低下す
る。一方、直鎖状低密度ポリエチレンの密度が上記範囲
を超える場合は、成形品の透明性が悪化する。更に、直
鎖状低密度ポリエチレンのQ値が上記範囲未満の場合
は、押出成形におけるウエルド部分の状態が悪化して本
発明の効果が得られない。
As a preferable linear low-density polyethylene capable of exerting the effect of the present invention in particular, one in which chromium oxide is supported on an inorganic carrier such as silica / alumina, that is, a chromium oxide-based Phillips catalyst By a gas phase method, a solution method, a slurry method, or 50
By applying a production process such as a high pressure ionic polymerization method in which polymerization is performed under the conditions of a polymerization pressure of 0 kg / cm 2 or more and a polymerization temperature of 100 to 350 ° C., ethylene and an α-olefin having 4 or more carbon atoms are co-polymerized. The linear low density polyethylene obtained by polymerization can be mentioned. In particular, it is preferable to use linear low-density polyethylene obtained by applying a manufacturing process by a gas phase method or the like. When the MFR of the linear low-density polyethylene is less than the above range, the dispersed state becomes poor in the resin and the transparency deteriorates. On the other hand, when the MFR of the linear low-density polyethylene exceeds the above range, the impact resistance strength decreases. If the density of the linear low-density polyethylene is less than the above range, the rigidity of the molded product will decrease. On the other hand, when the density of the linear low-density polyethylene exceeds the above range, the transparency of the molded product deteriorates. Further, when the Q value of the linear low-density polyethylene is less than the above range, the state of the weld portion in extrusion molding deteriorates, and the effect of the present invention cannot be obtained.

【0009】(3) エチレンと炭素数3以上のα−オレ
フィン共重合体エラストマー 本発明の押出成形用樹脂組成物において用いられるエチ
レンと炭素数3以上のα−オレフィン共重合体とのエラ
ストマーとしては、JIS−K7210(230℃、
2.16kg荷重)により測定したメルトフローレート
(MFR)が0.1〜10g/10分、好ましくは0.
3〜5g/10分、特に好ましくは0.5〜3g/10
分で、しかも、JIS−K7112により測定した密度
が0.840〜0.900g/cm3 、好ましくは0.
850〜0.890g/cm3 、特に好ましくは0.8
60〜0.880g/cm3 の物性を有する、エチレン
と炭素数が3以上、好ましくは3〜10のα−オレフィ
ン、例えば、プロピレン、ブテン−1、ヘキセン−1、
オクテン−1、デセン−1等との共重合体エラストマー
である。エチレンと炭素数3以上のα−オレフィン共重
合体エラストマーのMFRが上記範囲未満の場合は、プ
ロピレン重合体中での分散状態が不良となり透明性が悪
化する。一方、エチレンと炭素数3以上のα−オレフィ
ン共重合体エラストマーのMFRが上記範囲を超える場
合は成形品の耐衝撃強度が低下する。また、エチレンと
炭素数3以上のα−オレフィン共重合体エラストマーの
密度が上記範囲未満の場合は成形品の剛性が低下する。
一方、エチレンと炭素数3以上のα−オレフィン共重合
体エラストマーの密度が上記範囲を超える場合は成形品
の耐衝撃強度が低下する。
(3) Ethylene and α-olefin copolymer elastomer having 3 or more carbon atoms As the elastomer of ethylene and α-olefin copolymer having 3 or more carbon atoms, which is used in the resin composition for extrusion molding of the present invention, , JIS-K7210 (230 ° C,
Melt flow rate (MFR) measured by 2.16 kg load) is 0.1 to 10 g / 10 minutes, preferably 0.1.
3 to 5 g / 10 minutes, particularly preferably 0.5 to 3 g / 10
In addition, the density measured by JIS-K7112 is 0.840 to 0.900 g / cm 3 , preferably 0.
850 to 0.890 g / cm 3 , particularly preferably 0.8
Ethylene and α-olefin having 3 or more carbon atoms, preferably 3 to 10 carbon atoms, such as propylene, butene-1, hexene-1, having physical properties of 60 to 0.880 g / cm 3 .
It is a copolymer elastomer with octene-1, decene-1, etc. If the MFR of ethylene and an α-olefin copolymer elastomer having 3 or more carbon atoms is less than the above range, the dispersion state in the propylene polymer becomes poor and the transparency deteriorates. On the other hand, when the MFR of the ethylene-α-olefin copolymer elastomer having 3 or more carbon atoms exceeds the above range, the impact resistance of the molded product is lowered. Further, when the density of ethylene and the α-olefin copolymer elastomer having 3 or more carbon atoms is less than the above range, the rigidity of the molded article decreases.
On the other hand, when the density of ethylene and the α-olefin copolymer elastomer having 3 or more carbon atoms exceeds the above range, the impact resistance of the molded product is lowered.

【0010】(4) その他の配合成分(任意成分) 本発明の押出成形用樹脂組成物には、上記必須成分に加
えて、本発明の効果を著しく損なわない範囲内で各種目
的に応じて他の任意の配合成分を配合することができ
る。それらの付加的成分としては、通常のポリオレフィ
ン用添加剤や配合材等として用いられる酸化防止剤、中
和剤、耐候性改良剤、気泡防止剤、分散剤、帯電防止
剤、滑剤、分子量調整剤(過酸化物等)、熱安定剤、光
安定剤、紫外線吸収剤、潤滑剤、防曇剤、アンチブロッ
キング剤、スリップ剤、難燃剤、導電性付与剤、架橋
剤、架橋助剤、金属不活性化剤、防菌剤、蛍光増白剤等
の各種助剤、他の各種樹脂及びエラストマー、フィラ
ー、着色剤等を挙げることができる。
(4) Other compounding components (optional components) In addition to the above-mentioned essential components, the resin composition for extrusion molding of the present invention may be used in accordance with various purposes within a range that does not significantly impair the effects of the present invention. Any of the compounding ingredients can be added. As additional components thereof, antioxidants, neutralizing agents, weather resistance improvers, antifoaming agents, dispersants, antistatic agents, lubricants, molecular weight modifiers which are usually used as additives and compounding materials for polyolefins. (Peroxide, etc.), heat stabilizer, light stabilizer, ultraviolet absorber, lubricant, antifogging agent, antiblocking agent, slip agent, flame retardant, conductivity imparting agent, crosslinker, crosslink aid, metal-free Examples thereof include activators, antibacterial agents, various auxiliaries such as optical brighteners, other various resins and elastomers, fillers, colorants and the like.

【0011】[II] 組 成(配合量) 本発明の押出成形用樹脂組成物にて用いられる上記成分
(A)〜成分(C)の配合量(組成)は、成分(A)の
プロピレン重合体を60〜95重量部、好ましくは75
〜90重量部、特に好ましくは70〜85重量部であ
り、成分(B)の直鎖状低密度ポリエチレンを5〜30
重量部、好ましくは10〜28重量部、特に好ましくは
15〜25重量部であり、成分(C)のエチレンと炭素
数が3以上のα−オレフィンとの共重合体エラストマー
を1〜15重量部、好ましくは3〜13重量部、特に好
ましくは5〜10重量部の割合で配合される。 成分(A)のプロピレン重合体の配合量が上記範囲未満
の場合は成形品の剛性が不足する。一方、プロピレン重
合体の配合量が上記範囲を超える場合は成形品の耐衝撃
強度が不足する。 成分(B)の直鎖状低密度ポリエチレンの配合量が上記
範囲未満の場合は成形品の耐衝撃性が不足する。一方、
直鎖状低密度ポリエチレンの配合量が上記範囲を超える
場合は成形品の剛性が不足する。 成分(C)のエチレン・炭素数3以上のα−オレフィン
共重合体エラストマーの配合量が上記範囲未満の場合は
成形品の耐衝撃性が不足する。一方、エチレン・炭素数
3以上のα−オレフィン共重合体エラストマーの配合量
が上記範囲を超える場合は押出成形品の剛性が不足す
る。
[II] Composition (Blending Amount) The blending amount (composition) of the above-mentioned components (A) to (C) used in the resin composition for extrusion molding of the present invention is the propylene weight of the component (A). 60 to 95 parts by weight, preferably 75
To 90 parts by weight, particularly preferably 70 to 85 parts by weight, and 5 to 30 parts by weight of the linear low density polyethylene of the component (B).
Parts by weight, preferably 10 to 28 parts by weight, particularly preferably 15 to 25 parts by weight, and 1 to 15 parts by weight of a copolymer elastomer of ethylene as the component (C) and an α-olefin having 3 or more carbon atoms. , Preferably 3 to 13 parts by weight, particularly preferably 5 to 10 parts by weight. When the blending amount of the propylene polymer as the component (A) is less than the above range, the rigidity of the molded product becomes insufficient. On the other hand, when the blending amount of the propylene polymer exceeds the above range, the impact resistance of the molded product becomes insufficient. If the blending amount of the linear low-density polyethylene as the component (B) is less than the above range, the impact resistance of the molded product will be insufficient. on the other hand,
If the blending amount of the linear low-density polyethylene exceeds the above range, the rigidity of the molded product will be insufficient. When the amount of the component (C) ethylene-C3 or more α-olefin copolymer elastomer blended is less than the above range, the impact resistance of the molded product is insufficient. On the other hand, if the blending amount of the ethylene / α-olefin copolymer elastomer having 3 or more carbon atoms exceeds the above range, the rigidity of the extruded product will be insufficient.

【0012】[III] 押出成形用樹脂組成物の製造 上記構成成分を上記割合で配合し、機械的に混合或いは
混練することにより、本発明の押出成形用樹脂組成物を
製造することができる。上記機械的混合或いは混練に用
いられる混合機或いは混練機としては、例えば、ヘンシ
ェルミキサー、スーパーミキサー、Vブレンダー、タン
ブラーミキサー、リボンブレンダー、バンバリーミキサ
ー、ニーダーブレンダー、ブラベンダープラストグラ
フ、ロール、一軸押出機、二軸押出機等を挙げることが
できる。また、混練温度は一般に100〜300℃で行
なわれる。上記混合機或いは混練機を用いて所定時間混
合・混練した後、通常の押出機によりペレット状に成形
することが好ましい。
[III] Production of Extrusion Molding Resin Composition The extrusion molding resin composition of the present invention can be produced by blending the above-mentioned constituents in the above proportions and mechanically mixing or kneading them. Examples of the mixer or kneader used for the above mechanical mixing or kneading include Henschel mixer, super mixer, V blender, tumbler mixer, ribbon blender, Banbury mixer, kneader blender, Brabender plastograph, roll, uniaxial extruder. , A twin-screw extruder and the like. The kneading temperature is generally 100 to 300 ° C. After mixing and kneading for a predetermined time using the above mixer or kneader, it is preferable to form pellets by an ordinary extruder.

【0013】[IV] 押出成形 上記の様にして製造された本発明の押出成形用樹脂組成
物は、押出成形機によって各種成形体に成形される。該
押出成形機の種類には、特に制限がなく、一般のブロ
ー、パイプ、チューブ、ストロー等のダイ内で合流部分
を持つ押出成形機において使用すると、その効果を発揮
することができる。特にブロー成形においてその効果が
顕著に現れ、ブロー比が2以上のブロー成形において特
別顕著にその効果を発揮することができる。また、これ
らの成形は単層押出ばかりでなく、各種樹脂との多層押
出成形においても広く使用することができる。
[IV] Extrusion Molding The resin composition for extrusion molding of the present invention produced as described above is molded into various molded articles by an extruder. The type of the extruder is not particularly limited, and the effect can be exhibited when used in an extruder having a confluent portion in a general die such as blow, pipe, tube and straw. In particular, the effect is remarkably exhibited in blow molding, and the effect can be particularly remarkably exhibited in blow molding with a blow ratio of 2 or more. Further, these moldings can be widely used not only in single layer extrusion but also in multilayer extrusion molding with various resins.

【0014】[0014]

【実施例】以下に示す実験例によって、本発明を更に具
体的に説明する。 [I] 原材料 実施例及び比較例において用いた原材料を以下に示す。 [成分(A)] プロピレン重合体:MFR:1.0g/10分、密度:
0.905g/cm3のプロピレン単独重合体(三菱油
化(株)製MA7) [成分(B)] ポリエチレンA :フィリップス触媒を用いて製造され
た、MFR:0.7g/10分、密度:0.920g/
cm3 、Q値:8.3の直鎖状エチレン・ブテン−1共
重合体、(三菱油化(株)製UE320) ポリエチレンB :チーグラー触媒を用いて製造され
た、MFR:1.0g/10分、密度:0.920g/
cm3 、Q値:3.5の直鎖状エチレン・ブテン−1共
重合体、(三菱油化(株)製UF230) ポリエチレンC :MFR:1.0g/10分、密度:
0.920g/cm3、Q値:24.5の高圧法長鎖状
エチレン単独重合体(三菱油化(株)製YF30) [成分(C)] エラストマー :MFR:0.7g/10分、密度:
0.865g/cm3のエチレン・プロピレン共重合体
エラストマー(日本合成ゴム(株)製EP07P)
EXAMPLES The present invention will be described in more detail with reference to the following experimental examples. [I] Raw Materials The raw materials used in Examples and Comparative Examples are shown below. [Component (A)] Propylene polymer: MFR: 1.0 g / 10 minutes, density:
0.905 g / cm 3 propylene homopolymer (MA7 manufactured by Mitsubishi Petrochemical Co., Ltd.) [Component (B)] Polyethylene A: manufactured using a Phillips catalyst, MFR: 0.7 g / 10 min, density: 0.920 g /
cm 3, Q value: linear ethylene butene-1 copolymer 8.3 (Mitsubishi Petrochemical Co., Ltd. UE320) Polyethylene B: was produced using a Ziegler catalyst, MFR: 1.0 g / 10 minutes, density: 0.920 g /
cm 3, Q value: linear ethylene butene-1 copolymer of 3.5, (UF230 manufactured by Mitsubishi Petrochemical Co., Ltd.) Polyethylene C: MFR: 1.0 g / 10 min, density:
High-pressure process long-chain ethylene homopolymer of 0.920 g / cm 3 , Q value: 24.5 (YF30 manufactured by Mitsubishi Yuka Co., Ltd.) [Component (C)] Elastomer: MFR: 0.7 g / 10 min, density:
0.865 g / cm 3 ethylene / propylene copolymer elastomer (EP07P manufactured by Nippon Synthetic Rubber Co., Ltd.)

【0015】[II] 実験例 実施例1 JIS−K7210により測定(230℃、2.16k
g荷重)したMFRが1.0g/10分で、JIS−K
7112により測定した密度が0.905g/cm3
プロピレン単独重合体75重量部、JIS−K7210
により測定(190℃、2.16kg荷重)したMFR
が0.7g/10分で、JIS−K7112により測定
した密度が0.920g/cm3 で、しかも、ゲルパー
ミェーションクロマトグラフにより測定した重量平均分
子量と数平均分子量の比(Q値)が8.3である直鎖状
エチレン・ブテン−1共重合体15重量部、JIS−K
7210により測定(230℃、2.16kg荷重)し
たMFRが0.7g/10分、JIS−K7112によ
り測定した密度が0.865g/cm3 のエチレン・プ
ロピレン共重合体エラストマー5重量部、及び、酸化防
止剤としてテトラキス[メチレン−3−(3,5−ジ−
t−ブチル−4−ヒドロキシフェニル)プロピオネー
ト]メタン0.2重量部と、中和剤としてステアリン酸
カルシウム0.05重量部とを、(株)カワタ製のスー
パーミキサーで3分間混合し、230℃の温度に加熱し
たスクリュー径50mmの押出機にて溶融混練して本発
明の押出成形用樹脂組成物を得た。
[II] Experimental Example Example 1 Measured according to JIS-K7210 (230 ° C., 2.16 k
g-load) MFR is 1.0g / 10min, JIS-K
7512 parts by weight of propylene homopolymer having a density of 0.905 g / cm 3 measured according to 7112, JIS-K7210
MFR measured by (190 ° C, 2.16kg load)
Is 0.7 g / 10 minutes, the density measured by JIS-K7112 is 0.920 g / cm 3 , and the ratio of the weight average molecular weight to the number average molecular weight (Q value) measured by gel permeation chromatography. 15 parts by weight of a linear ethylene / butene-1 copolymer having a 8.3 of 8 and JIS-K
MFR measured by 7210 (230 ° C., 2.16 kg load) is 0.7 g / 10 minutes, 5 parts by weight of ethylene / propylene copolymer elastomer having a density measured by JIS-K7112 of 0.865 g / cm 3 , and Tetrakis [methylene-3- (3,5-di-
t-Butyl-4-hydroxyphenyl) propionate] methane (0.2 parts by weight) and calcium stearate (0.05 parts by weight) as a neutralizing agent were mixed for 3 minutes with a super mixer manufactured by Kawata Co., Ltd. The resin composition for extrusion molding of the present invention was obtained by melt-kneading with an extruder heated to a temperature and having a screw diameter of 50 mm.

【0016】この押出成形用樹脂組成物を熱プレス成形
機にて、厚さ2mmのシートを成形し、オルゼン曲げ弾
性率(ASTM−D747、測定温度23℃)とシャル
ピー衝撃強度(JIS−K7111、測定温度23℃)
を測定した。その結果を表1に示す。更に、この押出成
形用樹脂組成物を(株)日本製鋼所製の径:50mm、
L/D=22のスクリューで、製品2個取りの直接押出
方式中空成形機を用いて、200℃の温度で溶融し、ダ
イヘッドから押出量15kg/hrでパリソンを押し出
した。その後、直ちに金型を閉じ、パリソン内に5kg
/cm2 の圧縮空気を吹き込んで内容量500g/cm
3 の偏平型瓶(胴部高さ200mm、幅77mm、奥行
45mm、目付け32g)を成形した。この瓶につい
て、胴部を切り取ってHAZE(JIS−K6717)
を測定し、ウエルド部分の外観を目視にて観察し、下記
の基準で評価を行なった。更に、胴部ウエルド部分を切
り取って引張強度(JIS−K7113)を測定した。
その結果を表1に示す。 ウエルド外観の評価基準 ◎:ウエルドのライン発生せず ○:ウエルドのライン発生するが、厚みは他の部分と同
等 ×:ウエルドのラインが発生し、厚みは他の部分の半分
以下となる。
A sheet having a thickness of 2 mm was formed from this resin composition for extrusion molding by a hot press molding machine, and the Olsen bending elastic modulus (ASTM-D747, measurement temperature 23 ° C.) and Charpy impact strength (JIS-K7111, (Measurement temperature 23 ℃)
Was measured. The results are shown in Table 1. Furthermore, the resin composition for extrusion molding was manufactured by Nippon Steel Works, Ltd. with a diameter of 50 mm,
With a screw of L / D = 22, a parison was extruded from a die head at an extrusion rate of 15 kg / hr using a direct extrusion type hollow molding machine in which two products were taken and melted at a temperature of 200 ° C. Immediately thereafter, close the mold and put 5 kg in the parison.
500 g / cm of internal volume by blowing compressed air of / cm 2
3 flat bottles (body height 200 mm, width 77 mm, depth 45 mm, basis weight 32 g) were molded. The body of this bottle is cut off and HASE (JIS-K6717)
Was measured, the appearance of the welded portion was visually observed, and evaluation was performed according to the following criteria. Further, the weld portion of the body portion was cut out and the tensile strength (JIS-K7113) was measured.
The results are shown in Table 1. Criteria for evaluating weld appearance ⊚: No weld line is generated ∘: Weld line is generated, but the thickness is the same as other portions. ×: Weld line is generated, and the thickness is less than half that of other portions.

【0017】実施例2〜3及び比較例1〜4 各種重合体の配合割合を、表1に示す配合量に変更した
以外は実施例1と同様にして実施した。その結果を表1
に示す。
Examples 2 to 3 and Comparative Examples 1 to 4 The same procedure as in Example 1 was carried out except that the blending ratio of each polymer was changed to the blending amount shown in Table 1. The results are shown in Table 1.
Shown in.

【0018】[0018]

【表1】 [Table 1]

【0019】[0019]

【発明の効果】本発明の押出成形用樹脂組成物は、特定
な物性のプロピレン重合体に特定の物性の直鎖状低密度
ポリエチレンを配合することによって、押出成形時にお
けるダイ内でのプロピレン重合体樹脂の合流部分(ウエ
ルド)での接着強度を著しく改良することができ、しか
も、成形されたプロピレン重合体樹脂製品の胴部に肉厚
の薄い部分を発生させないので、樹脂製品の強度を低下
させることがない。
EFFECT OF THE INVENTION The resin composition for extrusion molding of the present invention comprises the propylene polymer having specific physical properties and the linear low-density polyethylene having specific physical properties which are mixed together to obtain a propylene polymer in a die during extrusion molding. Adhesive strength at the merging portion (weld) of the united resin can be significantly improved, and since the thin portion does not occur in the body of the molded propylene polymer resin product, the strength of the resin product is reduced. There is nothing to do.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 C08L 23:04) B29K 23:00 (72)発明者 稲 垣 均 三重県四日市市東邦町1番地 三菱油化株 式会社四日市総合研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Reference number within the agency FI technical display location C08L 23:04) B29K 23:00 (72) Inventor Hitoshi Inagaki 1 Toho-cho, Yokkaichi-shi, Mie Mitsubishi Yuka Co., Ltd. Yokkaichi Research Institute

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】下記の成分(A)〜成分(C)からなるこ
とを特徴とする、押出成形用樹脂組成物。 成分(A):メルトフローレート(230℃、2.16kg荷重)が0.1〜5 g/10分、密度が0.890〜0.915g/cm3 のプロピレン重合体 60〜95重量部 成分(B):メルトフローレート(190℃、2.16kg荷重)が0.1〜1 0g/10分、密度が0.910〜0.935g/cm3 、重量平均分子量と数 平均分子量の比(Q値)が5以上の直鎖状低密度ポリエチレン 5〜30重量部 成分(C):メルトフローレート(230℃、2.16kg荷重)が0.1〜1 0g/10分、密度が0.840〜0.900g/cm3 のエチレンと炭素数が 3以上のα−オレフィンとの共重合体エラストマー 1〜15重量部
1. A resin composition for extrusion molding comprising the following components (A) to (C). Component (A): Propylene polymer having a melt flow rate (230 ° C., 2.16 kg load) of 0.1 to 5 g / 10 minutes and a density of 0.890 to 0.915 g / cm 3 60 to 95 parts by weight Component (B): Melt flow rate (190 ° C., 2.16 kg load) 0.1 to 10 g / 10 minutes, density 0.910 to 0.935 g / cm 3 , ratio of weight average molecular weight to number average molecular weight ( Linear low density polyethylene having a Q value of 5 or more 5 to 30 parts by weight Component (C): Melt flow rate (230 ° C., 2.16 kg load) 0.1 to 10 g / 10 minutes, density 0. Copolymer elastomer of 840 to 0.900 g / cm 3 of ethylene and α-olefin having 3 or more carbon atoms 1 to 15 parts by weight
【請求項2】成分(B)の直鎖状低密度ポリエチレン
が、酸化クロム系フィリップス型触媒を用いて製造され
た直鎖状低密度ポリエチレンである、請求項1に記載の
押出成形用樹脂組成物。
2. The resin composition for extrusion molding according to claim 1, wherein the linear low-density polyethylene of the component (B) is a linear low-density polyethylene produced by using a chromium oxide type Phillips type catalyst. Stuff.
JP22528994A 1994-09-20 1994-09-20 Extrusion molding resin composition Expired - Fee Related JP3366461B2 (en)

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Application Number Priority Date Filing Date Title
JP22528994A JP3366461B2 (en) 1994-09-20 1994-09-20 Extrusion molding resin composition

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JPH0892438A true JPH0892438A (en) 1996-04-09
JP3366461B2 JP3366461B2 (en) 2003-01-14

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ID=16827005

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083218A (en) * 2004-09-14 2006-03-30 Mitsui Chemicals Inc Propylenic resin composition and blow molded article comprising the composition
JP2011256248A (en) * 2010-06-08 2011-12-22 Japan Polypropylene Corp Polypropylene resin composition for extrusion molding, and resin molded form coated with the composition
KR20200018616A (en) * 2017-06-27 2020-02-19 아부 다비 폴리머스 씨오. 엘티디 (보르쥬) 엘엘씨. Polypropylene composition for the production of high pressure pipes

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2006083218A (en) * 2004-09-14 2006-03-30 Mitsui Chemicals Inc Propylenic resin composition and blow molded article comprising the composition
JP2011256248A (en) * 2010-06-08 2011-12-22 Japan Polypropylene Corp Polypropylene resin composition for extrusion molding, and resin molded form coated with the composition
KR20200018616A (en) * 2017-06-27 2020-02-19 아부 다비 폴리머스 씨오. 엘티디 (보르쥬) 엘엘씨. Polypropylene composition for the production of high pressure pipes

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Publication number Publication date
JP3366461B2 (en) 2003-01-14

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