JPS6364465B2 - - Google Patents
Info
- Publication number
- JPS6364465B2 JPS6364465B2 JP56045488A JP4548881A JPS6364465B2 JP S6364465 B2 JPS6364465 B2 JP S6364465B2 JP 56045488 A JP56045488 A JP 56045488A JP 4548881 A JP4548881 A JP 4548881A JP S6364465 B2 JPS6364465 B2 JP S6364465B2
- Authority
- JP
- Japan
- Prior art keywords
- composition
- weight
- ethylene polymer
- parts
- intrinsic viscosity
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 229920000573 polyethylene Polymers 0.000 claims description 20
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 claims description 3
- 239000005977 Ethylene Substances 0.000 claims description 3
- 239000004711 α-olefin Substances 0.000 claims description 3
- 229920000089 Cyclic olefin copolymer Polymers 0.000 claims description 2
- 229920001519 homopolymer Polymers 0.000 claims description 2
- 239000000463 material Substances 0.000 description 3
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 2
- 238000000071 blow moulding Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 229920001903 high density polyethylene Polymers 0.000 description 2
- 239000004700 high-density polyethylene Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000000465 moulding Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000003054 catalyst Substances 0.000 description 1
- 230000000052 comparative effect Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 238000005336 cracking Methods 0.000 description 1
- 230000006353 environmental stress Effects 0.000 description 1
- 230000001747 exhibiting effect Effects 0.000 description 1
- 239000012760 heat stabilizer Substances 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920000642 polymer Polymers 0.000 description 1
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 1
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Compositions Of Macromolecular Compounds (AREA)
Description
本発明はエチレン系重合体組成物に関し、詳し
くは極限粘度の異なる三種のエチレン系重合体を
特定割合で配合してなり、ダイスウエルを程よく
調整することのできるエチレン系重合体組成物に
関する。
一般に高密度ポリエチレンは、いわゆるチーグ
ラー型触媒を用いて製造されており、製品の機械
的強度を向上させるために分子量の高いものが製
造されている。この場合、製品の分子量分布が狭
いと成形加工に際して流動性が悪く、生産性の低
下を招き、また成形時の樹脂圧力が高くなるので
所要動力を大きくする必要がある。
このため、従来はエチレンの重合工程を二段階
に分けて行なうことにより、分子量分布の広い製
品を得る試みがなされている。
しかしながら、この二段階重合法による場合に
は、得られる製品のダイスウエルが小さく、特に
シート、フイルム等の押出成形や大型瓶等のブロ
ー成形時に支障をきたしている。
そこで本発明者らは上記従来技術の欠点を克服
し、機械的性質にすぐれ、しかもダイスウエルを
大幅に調整することのできる素材を開発すべく鋭
意研究を重ねた。その結果、極限粘度の異なる三
種のエチレン系重合体を一定の割合で配合するこ
とにより、目的とする物性を備えた素材が得られ
ることを見出し、本発明を完成するに到つた。
すなわち、本発明は(A)極限粘度0.3〜1.5のエチ
レン系重合体100重量部、(B)極限粘度1.5〜7.0の
エチレン系重合体20〜120重量部および(C)極限粘
度24〜40のエチレン系重合体２〜80重量部よりな
るエチレン系重合体組成物を提供するものであ
る。
本発明の組成物の(A)成分は、上述の如く極限粘
度〔η〕が0.3〜1.5のエチレン系重合体である。
またこの(A)成分の配合量は、(B)，(C)成分に対して
上記の如く定める。ここで(A)成分の極限粘度
〔η〕が0.3未満では得られる組成物の強度が不充
分なものとなる。一方、配合量が少なすぎると組
成物の流動性が低下するため加工性に劣り、逆に
多すぎると組成物の機械的強度が低下する。
次に本発明の組成物の(B)成分は、上述の如く極
限粘度〔η〕が1.5〜7.0のエチレン系重合体であ
る。またこの(B)成分の配合量は、(A)成分100重量
部あたり20〜120重量部とすべきである。ここで
(B)成分の極限粘度〔η〕が1.5未満のものでは組
成物の機械的強度が不充分であり、7.0を越える
と組成物の流動性が低下する。また配合量につい
ても20重量部未満では組成物の機械的強度が低下
し、120重量部を越えると組成物の流動性が低下
する。
さらに、本発明の組成物の(C)成分は、上述の如
く極限粘度〔η〕が24〜40のエチレン系重合体で
ある。またこの(C)成分の配合量は、(A)成分100重
量部あたり２〜80重量部とすべきである。ここで
(C)成分の極限粘度〔η〕が40を越えると前述の
(A)，(B)成分との混練が困難となる。また配合量が
２重量部未満では組成物のダイスウエルが増加せ
ず、一方80重量部を越えると組成物の流動性が低
下し、好ましくない。
本発明の組成物において(A)，(B)あるいは(C)成分
を構成するエチレン系重合体としては、エチレン
単純重合体を用いることができることは勿論であ
るが、そのほかにプロピレンやブテン−１等のα
−オレフインを30重量％以下の量で含有するエチ
レン−α−オレフイン共重合体を用いることもで
きる。このような共重合体を用いると、組成物の
耐環境応力亀裂性や衝撃強度が向上したものとな
る。
なお上記(A)，(B)，(C)成分を所定量配合し、混練
するには、各種手段、例えばバンバリーミキサ
ー、二軸混練機などにより行なえばよい。またこ
の際耐熱安定剤を加えることもできる。
かくして得られる本発明の組成物は、機械的性
質においてすぐれ、しかもダイスウエルを大幅に
調整できるので、シートやフイルムの押出成形、
大型瓶のブロー成形などに用いる素材として極め
て有効に利用することができる。
次に本発明の実施例を示す。
実施例１〜10および比較例１〜５
所定の極限粘度を示す三種類のエチレン単独重
合体を(A)，(B)，(C)成分として各種割合で配合して
バンバリーミキサーにより溶融混練してエチレン
系重合体組成物を製造した。得られた組成物のダ
イスウエルを測定し、その結果を第１表に示す。
なおここでダイスウエルの値は、キヤピラリーレ
オメーターを使用し、190℃で内径0.06インチ、
Ｌ／Ｄ＝33.3、剪断速度103sec-1のときの値であ
る。
The present invention relates to an ethylene polymer composition, and more particularly to an ethylene polymer composition that is made by blending three types of ethylene polymers with different intrinsic viscosities in a specific ratio, and which can moderately adjust the die swell. Generally, high-density polyethylene is manufactured using a so-called Ziegler type catalyst, and high-density polyethylene is manufactured to have a high molecular weight in order to improve the mechanical strength of the product. In this case, if the molecular weight distribution of the product is narrow, fluidity will be poor during molding, leading to a decrease in productivity, and the resin pressure during molding will be high, so it is necessary to increase the required power. For this reason, conventional attempts have been made to divide the ethylene polymerization process into two stages to obtain a product with a wide molecular weight distribution. However, in the case of this two-step polymerization method, the die swell of the obtained product is small, which poses a problem especially when extrusion molding of sheets, films, etc., and blow molding of large bottles, etc. are performed. Therefore, the inventors of the present invention have conducted intensive research in order to overcome the drawbacks of the above-mentioned conventional techniques and to develop a material that has excellent mechanical properties and can also greatly adjust the die swell. As a result, they discovered that a material with desired physical properties could be obtained by blending three types of ethylene polymers with different intrinsic viscosities in a fixed ratio, and completed the present invention. That is, the present invention comprises (A) 100 parts by weight of an ethylene polymer having an intrinsic viscosity of 0.3 to 1.5, (B) 20 to 120 parts by weight of an ethylene polymer having an intrinsic viscosity of 1.5 to 7.0, and (C) 24 to 40 parts by weight of an ethylene polymer having an intrinsic viscosity of 24 to 40. An ethylene polymer composition comprising 2 to 80 parts by weight of an ethylene polymer is provided. Component (A) of the composition of the present invention is an ethylene polymer having an intrinsic viscosity [η] of 0.3 to 1.5, as described above.
The amount of component (A) to be blended is determined as described above for components (B) and (C). If the intrinsic viscosity [η] of component (A) is less than 0.3, the resulting composition will have insufficient strength. On the other hand, if the amount is too small, the fluidity of the composition will be reduced, resulting in poor processability, while if the amount is too large, the mechanical strength of the composition will be reduced. Next, component (B) of the composition of the present invention is an ethylene polymer having an intrinsic viscosity [η] of 1.5 to 7.0, as described above. The amount of component (B) to be blended should be 20 to 120 parts by weight per 100 parts by weight of component (A). here
If the intrinsic viscosity [η] of component (B) is less than 1.5, the mechanical strength of the composition will be insufficient, and if it exceeds 7.0, the fluidity of the composition will decrease. Also, if the amount is less than 20 parts by weight, the mechanical strength of the composition will decrease, and if it exceeds 120 parts by weight, the fluidity of the composition will decrease. Furthermore, component (C) of the composition of the present invention is an ethylene polymer having an intrinsic viscosity [η] of 24 to 40, as described above. The amount of component (C) to be blended should be 2 to 80 parts by weight per 100 parts by weight of component (A). here
If the intrinsic viscosity [η] of component (C) exceeds 40, the above
It becomes difficult to mix with components (A) and (B). If the amount is less than 2 parts by weight, the die swell of the composition will not increase, while if it exceeds 80 parts by weight, the fluidity of the composition will decrease, which is not preferable. As the ethylene polymer constituting component (A), (B) or (C) in the composition of the present invention, it is of course possible to use a simple ethylene polymer, but in addition, propylene and butene-1 polymers can be used. α of
It is also possible to use ethylene-α-olefin copolymers containing up to 30% by weight of -olefin. When such a copolymer is used, the composition has improved environmental stress cracking resistance and impact strength. Note that the above components (A), (B), and (C) may be blended in predetermined amounts and kneaded by various means such as a Banbury mixer, a twin-screw kneader, and the like. A heat stabilizer can also be added at this time. The composition of the present invention thus obtained has excellent mechanical properties and the die swell can be largely adjusted, so it can be used for extrusion molding of sheets and films,
It can be used extremely effectively as a material for blow molding large bottles. Next, examples of the present invention will be shown. Examples 1 to 10 and Comparative Examples 1 to 5 Three types of ethylene homopolymers exhibiting predetermined intrinsic viscosity were blended as components (A), (B), and (C) in various proportions and melt-kneaded using a Banbury mixer. An ethylene polymer composition was produced. The die swell of the obtained composition was measured and the results are shown in Table 1.
Note that the die well value here is measured using a capillary rheometer with an inner diameter of 0.06 inches at 190°C.
This value is when L/D=33.3 and shear rate is 103 sec -1 .
【表】【table】
Claims (1)
重量部、(B)極限粘度1.5〜7.0のエチレン系重合体
20〜120重量部および(C)極限粘度24〜40のエチレ
ン系重合体２〜80重量部よりなるエチレン系重合
体組成物。 ２ エチレン系重合体がエチレン単独重合体ある
いはα−オレフイン含量30重量％以下のエチレン
−α−オレフイン共重合体である特許請求の範囲
第１項記載の組成物。[Claims] 1 (A) Ethylene polymer 100 having an intrinsic viscosity of 0.3 to 1.5
Parts by weight, (B) Ethylene polymer with intrinsic viscosity 1.5 to 7.0
An ethylene polymer composition comprising 20 to 120 parts by weight and (C) 2 to 80 parts by weight of an ethylene polymer having an intrinsic viscosity of 24 to 40. 2. The composition according to claim 1, wherein the ethylene polymer is an ethylene homopolymer or an ethylene-α-olefin copolymer having an α-olefin content of 30% by weight or less.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4548881A JPS57159834A (en) | 1981-03-30 | 1981-03-30 | Ethylene polymer composition |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4548881A JPS57159834A (en) | 1981-03-30 | 1981-03-30 | Ethylene polymer composition |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS57159834A JPS57159834A (en) | 1982-10-02 |
| JPS6364465B2 true JPS6364465B2 (en) | 1988-12-12 |
Family
ID=12720782
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4548881A Granted JPS57159834A (en) | 1981-03-30 | 1981-03-30 | Ethylene polymer composition |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS57159834A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59100151A (en) * | 1982-11-30 | 1984-06-09 | Idemitsu Petrochem Co Ltd | Polyethylene resin composition |
| JPS59196345A (en) * | 1983-04-21 | 1984-11-07 | Asahi Chem Ind Co Ltd | Polyethylene composition |
| JPS59196346A (en) * | 1983-04-21 | 1984-11-07 | Asahi Chem Ind Co Ltd | Polyethylene resin composition |
| JPS6036546A (en) * | 1983-08-09 | 1985-02-25 | Asahi Chem Ind Co Ltd | Polyethylene resin composition |
| JPS6036547A (en) * | 1983-08-09 | 1985-02-25 | Asahi Chem Ind Co Ltd | Polyethylene-based composition |
| JPS59232134A (en) * | 1983-06-16 | 1984-12-26 | Idemitsu Petrochem Co Ltd | Ethylene polymer composition |
| JPS6026049A (en) * | 1983-07-22 | 1985-02-08 | Asahi Chem Ind Co Ltd | Polyethylene composition |
| JPS6026050A (en) * | 1983-07-22 | 1985-02-08 | Asahi Chem Ind Co Ltd | Polyethylene composition |
| JPS6026051A (en) * | 1983-07-22 | 1985-02-08 | Asahi Chem Ind Co Ltd | Polyethylene composition |
| CN101809073B (en) | 2007-09-28 | 2012-11-07 | 普瑞曼聚合物株式会社 | Expandable polypropylene resin composition, and process for production of foam-injection-molded article using the same |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152735A (en) * | 1979-05-18 | 1980-11-28 | Asahi Chem Ind Co Ltd | Polyethylene composition |
| JPS5731945A (en) * | 1980-08-04 | 1982-02-20 | Asahi Chem Ind Co Ltd | Polyethylene composition and preparation of the same |
-
1981
- 1981-03-30 JP JP4548881A patent/JPS57159834A/en active Granted
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS55152735A (en) * | 1979-05-18 | 1980-11-28 | Asahi Chem Ind Co Ltd | Polyethylene composition |
| JPS5731945A (en) * | 1980-08-04 | 1982-02-20 | Asahi Chem Ind Co Ltd | Polyethylene composition and preparation of the same |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS57159834A (en) | 1982-10-02 |
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