JPH0241539B2 - - Google Patents
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- Publication number
- JPH0241539B2 JPH0241539B2 JP57089820A JP8982082A JPH0241539B2 JP H0241539 B2 JPH0241539 B2 JP H0241539B2 JP 57089820 A JP57089820 A JP 57089820A JP 8982082 A JP8982082 A JP 8982082A JP H0241539 B2 JPH0241539 B2 JP H0241539B2
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- 238000001125 extrusion Methods 0.000 claims description 16
- 229920001684 low density polyethylene Polymers 0.000 claims description 10
- 239000004702 low-density polyethylene Substances 0.000 claims description 10
- 229920001155 polypropylene Polymers 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 9
- 229920000573 polyethylene Polymers 0.000 claims description 9
- 230000003446 memory effect Effects 0.000 claims description 8
- 239000003054 catalyst Substances 0.000 claims description 7
- 238000002156 mixing Methods 0.000 claims description 5
- 239000000155 melt Substances 0.000 claims description 4
- 239000011342 resin composition Substances 0.000 claims description 4
- 239000004711 α-olefin Substances 0.000 claims description 3
- 230000000052 comparative effect Effects 0.000 description 10
- -1 Polypropylene Polymers 0.000 description 8
- 238000007789 sealing Methods 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- 229920005604 random copolymer Polymers 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 4
- 230000000903 blocking effect Effects 0.000 description 4
- 238000000465 moulding Methods 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 229920000642 polymer Polymers 0.000 description 3
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 3
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 3
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 239000003795 chemical substances by application Substances 0.000 description 2
- 239000004615 ingredient Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- VYZAMTAEIAYCRO-UHFFFAOYSA-N Chromium Chemical compound [Cr] VYZAMTAEIAYCRO-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000006096 absorbing agent Substances 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 150000001491 aromatic compounds Chemical class 0.000 description 1
- 229920001400 block copolymer Polymers 0.000 description 1
- DQXBYHZEEUGOBF-UHFFFAOYSA-N but-3-enoic acid;ethene Chemical compound C=C.OC(=O)CC=C DQXBYHZEEUGOBF-UHFFFAOYSA-N 0.000 description 1
- 150000001735 carboxylic acids Chemical class 0.000 description 1
- 229910052804 chromium Inorganic materials 0.000 description 1
- 239000011651 chromium Substances 0.000 description 1
- 239000008395 clarifying agent Substances 0.000 description 1
- 239000003086 colorant Substances 0.000 description 1
- 230000001143 conditioned effect Effects 0.000 description 1
- 229920001577 copolymer Polymers 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000005038 ethylene vinyl acetate Substances 0.000 description 1
- 235000012438 extruded product Nutrition 0.000 description 1
- 239000000945 filler Substances 0.000 description 1
- 238000009472 formulation Methods 0.000 description 1
- 229920001519 homopolymer Polymers 0.000 description 1
- 239000003112 inhibitor Substances 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 239000002648 laminated material Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000002844 melting Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003472 neutralizing effect Effects 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- 229920001200 poly(ethylene-vinyl acetate) Polymers 0.000 description 1
- 238000006116 polymerization reaction Methods 0.000 description 1
- 230000001737 promoting effect Effects 0.000 description 1
- 229920001384 propylene homopolymer Polymers 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 150000004756 silanes Chemical class 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229920002725 thermoplastic elastomer Polymers 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
Description
本発明は、成形加工時の押出変動が改善され、
低温ヒートシール性、ネツクイン、剛性、透明性
のバランスの良好な押出成形用樹脂組成物に関す
る。
透明性の良好なフイルムやシートなどの押出成
形品材料としてポリプロピレンが知られている。
このポリプロピレンフイルム等は、剛性も優れる
ことから、各種包装材として広く用いられてい
る。
しかしながら、ポリプロピレンフイルム等は低
温ヒートシール性や低温衝撃強度が劣る欠点を有
しており、従来から、この欠点を改善する目的
で、比較的低融点の樹脂、例えば低密度ポリエチ
レンやエチレン―酢酸ビニル共重合体を混練する
方法が知られている。
これらの方法による組成物は、上記の欠点の改
善には有効であるが、成形加工時に押出変動によ
るフイルムの波打ちが起こり、厚みが一定しない
など製品価値を損うと云つた新たな欠点を有す
る。
本発明は、この欠点を解消し、かつ成形品とし
ての低温ヒートシール性、ネツクイン、剛性、透
明性のバランスを良好に保つ樹脂組成物を開発す
べく検討の結果、結晶性プロピレン重合体と、特
定の線型低密度エチレン重合体および低密度ポリ
エチレンからなる特定配合物が、意外にも上記の
目的を満足することが判明して為されたものであ
る。
すなわち本発明は、下記(a)〜(c)の各成分を含
み、(a)成分が30〜80重量部、(b)成分が70〜20重量
部および(c)成分が上記(a)成分と(b)成分の合計量
100重量部に対し５〜20重量部の配合割合である
ことを特徴とする押出成形用樹脂組成物である。
(a) メルトフローレート0.3〜10ｇ／10分の結晶
性プロピレン重合体
(b) チーグラー系触媒を用いて製造された密度
0.910〜0.930ｇ／cm3かつ共単量体のα―オレフ
イン含量２〜10重量％の線型低密度エチレン重
合体
(c) 高圧法で製造された密度0.915〜0.930ｇ／
cm3、メルトフローレート0.5〜10ｇ／10分かつ
メモリー効果1.5〜2.3の低密度ポリエチレン
本発明の組成物は、上記の点で優れているの
で、押出成形品の中でも特にフイルムやラミネー
ト材料に適している。
本発明で用いられる上記(a)成分である結晶性プ
ロピレン重合体は、メルトフローレート（MFR）
が0.3〜10ｇ／10分のものが適当である。この範
囲を下廻るものは良好な成形性が得られず、又上
廻るものは本発明の効果が低い。
結晶性に関しては、アイソタクチツクインデツ
クスにして60以上、好ましくは80以上、特に90以
上が良い。
このようなプロピレン重合体は、プロピレンの
単独重合体、過半重量のプロピレンと他のα―オ
レフイン、例えばエチレン、ブテン―１、ヘキセ
ン―１、４―メチルペンテン―１等とのブロツク
又はランダム共重合体やこれらの重合体を不飽和
カルボン酸ないしはその誘導体、不飽和芳香族化
合物、不飽和有機シラン等で変性したものや酸化
した変性物等も含む。
これらのうち、プロピレンの単独重合体、プロ
ピレン―エチレンランダム共重合体、特にプロピ
レン―エチレンランダム共重合体が好ましい。
次に、本発明で用いる上記(b)成分は、チーグラ
ー系触媒を用いて製造された密度0.910〜0.930
ｇ／cm3かつ共単量体含量２〜10重量％の低密度エ
チレン重合体が適する。
このような重合体は、エチレンと、共単量体と
してプロピレン、ブテン―１、ヘキセン―１、４
―メチルペンテン―１等を圧力、例えば1000Kg／
cm2程度以下、好ましくは70Kg／cm2程度以下で重合
して得られるもので、製造法としては、例えば特
開昭54−154488等の公報に記載された方法が知ら
れている。
チーグラー系触媒以外の、例えばクロム系触媒
を用いて製造された線型低密度エチレン重合体で
は透明性、機械的強度が不足して実用に供し得る
ものとならず、また、例えばバナジウム触媒を用
いて製造された線型低密度エチレン重合体では剛
性、アンチブロツキング性が低すぎて良好な品質
バランスのものとならない。
密度が上記範囲を下廻るものは、組成物にした
ときの剛性低下が大きくて本発明の効果が低く、
また範囲を上廻るものは、衝撃強度が悪化すると
いつた欠点を有する。好ましい密度は、0.915〜
0.930ｇ／cm3である。
また、共単量体含量が上記範囲をはずれるもの
は、最終目的の組成物の透明性、衝撃強度、剛性
の点で好ましくないといつた欠点を有する。好ま
しい共単量体含量は３〜８重量％である。
更に、本発明で用いる上記(c)成分は、高圧法で
製造された密度0.915〜0.930ｇ／cm3、MFR0.5〜
10ｇ／10分かつメモリー効果（ME）1.5〜2.3の
低密度ポリエチレンである。
高圧法で製造された以外の低密度ポリエチレン
では押出変動、ネツクイン等の加工性改良の効果
がみられない。
密度が上記範囲をはずれるものは、本発明の効
果であるフイルムの低温ヒートシール性や剛性が
低下して好ましくない。
また、MFRおよびMEが上記範囲をはずれる
ものは、結晶性プロピレン重合体との相溶性が劣
り、フイルムの外観が悪化するといつた欠点を有
する。好ましいMEは1.5〜2.0である。
なお、ここでMEは、JIS―Ｋ―7210―1975に
規定された装置を用いて、240℃で樹脂を押出す
が、荷重を変えて押出量が１ｇ／分を下まわる範
囲と１ｇ／分を上まわる範囲で、かつ両方共１
ｇ／分近傍での押出物を採取する。押出物はドロ
ーダウンを防止するため、オリフイス通過直後に
エタノール中に受けて冷却した後、直径を測定す
る。各押出量に対応した押出物の直径をプロツト
し、押出量が１ｇ／分に対応する押出物の直径
（mm）をオリフイス径１mm）で除してこれをME
とする。
また、MFRは、ASTM―Ｄ―1238法により、
結晶性プロピレン重合体は230℃、チーグラー触
媒を用いて製造された低密度エチレン重合体およ
び高圧法で製造された低密度ポリエチレンは190
℃で測定する値を示す。
また、(b)または(c)成分には、(a)成分で記載した
ような夫々の変性物も含まれる。
これらの３成分の配合割合は、(a)成分が30〜80
重量部、好ましくは50〜70重量部、(b)成分が70〜
20重量部、好ましくは50〜30重量部、および(c)成
分が、上記(a)と(b)の各成分の合計量100重量部に
対して５〜20重量部、好ましくは５〜15重量部、
特に好ましくは５〜10重量部である。
これらの範囲をはずれたものは、本発明の効果
の発現が小さい。
本発明では、これらの必須成分の外に、酸化防
止剤、紫外線吸収剤、銅害防止剤、着色剤、補強
や外観用充填剤、ブロツキング防止剤、透明化
剤、中和剤等の付加的成分を混ぜることができ
る。また、本発明で用いる以外の熱可塑性樹脂や
ゴムを改質の目的で若干添加することもできる。
実施例
実施例中の押出変動、ネツクイン、モーター負
荷（成形性）、ブロツキング強度（べたつき）、霞
度、ヒートシール強度および引張弾性率は次の方
法で行なつた。
押出変動：成形したフイルムの厚さを成形方向
に連続的に測定し、次の基準で評価した。Ａ
およびＢが実用可能。
Ａ：振れ幅が±15％以下。
Ｂ：同士15％超過〜±25％以下。
Ｃ：同士25％超過〜±100％以下。
Ｄ：同士100％超過。
ネツクイン：〔（ダイ有効幅）−（押出フイルム
幅）〕mmで測定値が小さい程、良好である。
モーター負荷：成形時の負荷を評価した。
ブロツキング強度：成形フイルムを高温（45
℃）、高荷重（50ｇ／cm2）下で24時間フイル
ム密着性を促進させた後、シヨツパー型引張
試験機にて引張速度500mm／minの条件でフ
イルム接着面10cm2を剪断的に引き剥がすに要
する最大応力（ｇ／10cm2）を評価した。
霞度：ASTM―D1003による。
ヒートシール強度：東洋精機社製のヒートシー
ラー試験機を用い、シール時間0.5秒、シー
ル圧力2.0Kg／cm2、シール面積５cm×200mmで
シールし、次いで23℃、50％RHで40時間状
態調整後、シヨツパー引張試験機にて引張速
度300mm／分で引張強度を測定した。
引張弾性率；ISO―R1184―1970による。
実施例１〜12、比較例１〜14
第１表に示す各物性値を有するプロピレン―エ
チレンランダム共重合体とチーグラー系触媒を用
いて製造された線型低密度エチレン重合体および
高圧法低密度ポリエチレンの各配合物をＶブレン
ダーで混合した後、スクリユー径35mmでＬ／Ｄ＝
28の押出機を用いて、ダイ温度230℃、幅300mmの
コートハンガーダイから0.025mm厚のフイルムと
して押出し、その押出変動とネツクインおよびモ
ーター負荷と、フイルムのブロツキング強度、透
明性、ヒートシール強度および引張弾性率を測定
した。その結果を第１表に示す。
プロピレン―エチレンランダム共重合体単独
（比較例１）では、低温ヒートシール性が劣り、
高圧法低密度ポリエチレンのみの配合系（比較例
２）は著しく透明性が劣る。
また、高圧法低密度ポリエチレンを配合してい
ない場合（比較例３〜６）は、各れも押出変動が
著しく激しく、ネツクインも比較的大きい。
プロピレン―エチレンランダム共重合体の
MFRが小さ過ぎるもの（比較例７）ではモータ
ー負荷が大きくなり過ぎ、一方、大き過ぎるもの
（比較例８）では押出変動が激しい。
線型低密度エチレン重合体の密度が低過ぎるも
の（比較例９）ではブロツキング性が不良とな
り、一方、高過ぎるもの（比較例10）ではヒート
シール強度が不良となる。
高圧法低密度ポリエチレンが本発明で用いる以
外のものの場合（比較例11および12）、またその
配合量が不適当な場合（比較例13および14）は、
押出変動が激しく又は引裂強度が小さく好ましく
ない。
The present invention improves extrusion fluctuations during molding,
The present invention relates to a resin composition for extrusion molding that has a good balance of low-temperature heat sealability, neck-in, rigidity, and transparency. Polypropylene is known as a material for extruded products such as films and sheets with good transparency.
This polypropylene film and the like are widely used as various packaging materials because of their excellent rigidity. However, polypropylene films have the disadvantage of poor low-temperature heat-sealability and low-temperature impact strength, and in order to improve these disadvantages, relatively low-melting point resins such as low-density polyethylene and ethylene-vinyl acetate have traditionally been used. Methods of kneading copolymers are known. Compositions produced by these methods are effective in improving the above-mentioned drawbacks, but they have new drawbacks such as waving of the film due to extrusion fluctuations during molding and uneven thickness, which impairs product value. The present invention was developed as a result of studies to develop a resin composition that eliminates this drawback and maintains a good balance between low-temperature heat sealability, necking, rigidity, and transparency as a molded product. It has now been discovered that a specific blend of a specific linear low density ethylene polymer and low density polyethylene surprisingly satisfies the above objectives. That is, the present invention includes each of the following components (a) to (c), in which component (a) is 30 to 80 parts by weight, component (b) is 70 to 20 parts by weight, and component (c) is the above (a). Total amount of component and (b) component
This is a resin composition for extrusion molding, characterized in that the blending ratio is 5 to 20 parts by weight per 100 parts by weight. (a) Crystalline propylene polymer with a melt flow rate of 0.3 to 10 g/10 min (b) Density produced using a Ziegler catalyst
Linear low-density ethylene polymer with a content of 0.910-0.930 g/cm 3 and a comonomer α-olefin of 2-10% by weight (c) Density 0.915-0.930 g/cm produced by high-pressure method
cm 3 , a melt flow rate of 0.5 to 10 g/10 min, and a memory effect of 1.5 to 2.3. The composition of the present invention is excellent in the above points, and is therefore particularly suitable for extrusion molded products, such as films and laminate materials. There is. The crystalline propylene polymer, which is the component (a) used in the present invention, has a melt flow rate (MFR) of
A suitable amount is 0.3 to 10 g/10 minutes. If it is below this range, good moldability cannot be obtained, and if it is above this range, the effect of the present invention is low. Regarding crystallinity, an isotactic index of 60 or more, preferably 80 or more, particularly 90 or more is good. Such propylene polymers include homopolymers of propylene, block or random copolymers of propylene in the majority by weight and other α-olefins, such as ethylene, butene-1, hexene-1, 4-methylpentene-1, etc. It also includes polymers obtained by modifying these polymers with unsaturated carboxylic acids or derivatives thereof, unsaturated aromatic compounds, unsaturated organic silanes, etc., and modified products obtained by oxidation. Among these, propylene homopolymers, propylene-ethylene random copolymers, and especially propylene-ethylene random copolymers are preferred. Next, the above component (b) used in the present invention has a density of 0.910 to 0.930 and is produced using a Ziegler catalyst.
Low density ethylene polymers with g/cm 3 and a comonomer content of 2 to 10% by weight are suitable. Such polymers contain ethylene and comonomers propylene, butene-1, hexene-1, 4
-Methylpentene-1 etc. under pressure, e.g. 1000Kg/
It is obtained by polymerization at a rate of about cm 2 or less, preferably about 70 kg/cm 2 or less, and the method described in, for example, Japanese Patent Application Laid-Open No. 154488/1984 is known as a manufacturing method. Linear low-density ethylene polymers produced using, for example, chromium-based catalysts other than Ziegler-based catalysts lack transparency and mechanical strength, making them unsuitable for practical use; The produced linear low-density ethylene polymer has too low rigidity and anti-blocking properties to provide a good quality balance. If the density is below the above range, the stiffness of the composition will decrease significantly and the effect of the present invention will be low.
Moreover, those exceeding this range have the disadvantage that impact strength deteriorates. The preferred density is 0.915~
It is 0.930g/ cm3 . Moreover, those having a comonomer content outside the above range have disadvantages such as being unfavorable in terms of transparency, impact strength, and rigidity of the final target composition. The preferred comonomer content is 3-8% by weight. Furthermore, the above component (c) used in the present invention has a density of 0.915 to 0.930 g/cm 3 and an MFR of 0.5 to
It is a low density polyethylene with a 10g/10min and memory effect (ME) of 1.5 to 2.3. Low-density polyethylene other than those produced by the high-pressure method does not exhibit the effects of improving processability, such as extrusion fluctuation and neck-in. If the density is outside the above range, the film's low-temperature heat-sealability and rigidity, which are the effects of the present invention, will deteriorate, which is undesirable. Furthermore, those whose MFR and ME are outside the above ranges have drawbacks such as poor compatibility with crystalline propylene polymers and poor appearance of the film. The preferred ME is 1.5-2.0. In addition, here, ME extrudes resin at 240℃ using equipment specified in JIS-K-7210-1975, but changes the load so that the extrusion rate is below 1g/min and 1g/min. and both are 1
Extrudates near g/min are collected. To prevent drawdown, the extrudate is cooled in ethanol immediately after passing through the orifice, and then its diameter is measured. Plot the diameter of the extrudate corresponding to each extrusion rate, divide the diameter (mm) of the extrudate corresponding to the extrusion rate of 1 g/min by the orifice diameter (1 mm), and calculate this by ME.
shall be. In addition, MFR is determined by ASTM-D-1238 method.
230℃ for crystalline propylene polymer, 190℃ for low density ethylene polymer produced using Ziegler catalyst and low density polyethylene produced by high pressure method.
Indicates the value measured in °C. In addition, the (b) or (c) component also includes the respective modified products as described for the (a) component. The blending ratio of these three components is 30 to 80% of component (a).
Parts by weight, preferably 50 to 70 parts by weight, component (b) 70 to 70 parts by weight
20 parts by weight, preferably 50 to 30 parts by weight, and component (c) is 5 to 20 parts by weight, preferably 5 to 15 parts by weight, based on 100 parts by weight of the total amount of each component (a) and (b) above. weight part,
Particularly preferably 5 to 10 parts by weight. Outside these ranges, the effect of the present invention will not be sufficiently exerted. In the present invention, in addition to these essential ingredients, additional substances such as antioxidants, ultraviolet absorbers, copper damage inhibitors, colorants, reinforcing and appearance fillers, antiblocking agents, clarifying agents, and neutralizing agents are added. Ingredients can be mixed. Further, a small amount of thermoplastic resin or rubber other than those used in the present invention may be added for the purpose of modification. Examples In the examples, extrusion fluctuation, neck-in, motor load (formability), blocking strength (stickiness), haze, heat seal strength, and tensile modulus were determined by the following methods. Extrusion fluctuation: The thickness of the molded film was continuously measured in the molding direction and evaluated based on the following criteria. A
and B are practical. A: The swing width is ±15% or less. B: Exceeding each other by 15% to ±25% or less. C: Exceeding 25% to ±100% or less. D: Exceeds 100% of each other. Network: [(Effective width of die) - (Width of extruded film)] The smaller the measured value is, the better it is. Motor load: The load during molding was evaluated. Blocking strength: Molded film is heated to high temperature (45
After promoting film adhesion for 24 hours under a high load (50 g/cm 2 ), 10 cm 2 of the adhesive surface of the film was sheared off at a tensile speed of 500 mm/min using a chopper type tensile tester. The maximum stress (g/10cm 2 ) required for this was evaluated. Haze: According to ASTM-D1003. Heat sealing strength: Using a heat sealer testing machine manufactured by Toyo Seiki Co., Ltd., sealing was performed with a sealing time of 0.5 seconds, a sealing pressure of 2.0Kg/cm 2 , and a sealing area of 5cm x 200mm, and then conditioned at 23℃ and 50%RH for 40 hours. After that, the tensile strength was measured using a Schottspur tensile tester at a tensile speed of 300 mm/min. Tensile modulus: Based on ISO-R1184-1970. Examples 1 to 12, Comparative Examples 1 to 14 Linear low density ethylene polymer and high pressure low density polyethylene produced using propylene-ethylene random copolymer and Ziegler catalyst having each physical property value shown in Table 1 After mixing each of the formulations in a V blender, L/D= with screw diameter of 35 mm.
Using a No. 28 extruder, a film with a thickness of 0.025 mm was extruded from a coat hanger die with a die temperature of 230°C and a width of 300 mm, and the extrusion fluctuation, network and motor load, blocking strength, transparency, heat sealing strength, and Tensile modulus was measured. The results are shown in Table 1. Propylene-ethylene random copolymer alone (Comparative Example 1) had poor low-temperature heat sealability;
The blended system containing only high-pressure low-density polyethylene (Comparative Example 2) had significantly poor transparency. Furthermore, when high-pressure low-density polyethylene was not blended (Comparative Examples 3 to 6), extrusion fluctuations were extremely severe and net-in was also relatively large. Propylene-ethylene random copolymer
If the MFR is too small (Comparative Example 7), the motor load becomes too large, while if the MFR is too large (Comparative Example 8), extrusion fluctuations are severe. If the density of the linear low density ethylene polymer is too low (Comparative Example 9), the blocking property will be poor, while if it is too high (Comparative Example 10), the heat sealing strength will be poor. If the high-pressure low-density polyethylene is other than that used in the present invention (Comparative Examples 11 and 12), or if the blending amount is inappropriate (Comparative Examples 13 and 14),
It is not preferable because the extrusion fluctuation is severe or the tear strength is low.
【表】【table】
Claims (1)
重量部、(b)成分が70〜20重量部および(c)成分が上
記(a)成分と(b)成分の合計量100重量部に対し５〜
20重量部の配合割合であることを特徴とする押出
成形用樹脂組成物。 (a) メルトフローレート0.3〜10ｇ／10分の結晶
性プロピレン重合体 (b) チーグラー系触媒を用いて製造された密度
0.910〜0.930ｇ／cm3かつ共単量体のα―オレフ
イン含量２〜10重量％の線型低密度エチレン重
合体 (c) 高圧法で製造された密度0.915〜0.930ｇ／
cm3、メルトフローレート0.5〜10ｇ／10分かつ
メモリー効果1.5〜2.3の低密度ポリエチレン[Scope of Claims] 1 Contains each of the following components (a) to (c), where component (a) is 30 to 80
70 to 20 parts by weight of component (b) and 5 to 20 parts by weight of component (c) per 100 parts by weight of the total amount of components (a) and (b) above.
A resin composition for extrusion molding, characterized in that the blending ratio is 20 parts by weight. (a) Crystalline propylene polymer with a melt flow rate of 0.3 to 10 g/10 min (b) Density produced using a Ziegler catalyst
Linear low-density ethylene polymer with 0.910 to 0.930 g/cm 3 and comonomer α-olefin content of 2 to 10% by weight (c) Density 0.915 to 0.930 g/cm produced by high pressure method
cm3 , low density polyethylene with melt flow rate 0.5-10g/10min and memory effect 1.5-2.3
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8982082A JPS58206647A (en) | 1982-05-28 | 1982-05-28 | Resin composition for extrusion molding |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8982082A JPS58206647A (en) | 1982-05-28 | 1982-05-28 | Resin composition for extrusion molding |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS58206647A JPS58206647A (en) | 1983-12-01 |
| JPH0241539B2 true JPH0241539B2 (en) | 1990-09-18 |
Family
ID=13981383
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP8982082A Granted JPS58206647A (en) | 1982-05-28 | 1982-05-28 | Resin composition for extrusion molding |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS58206647A (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5941342A (en) * | 1982-09-01 | 1984-03-07 | Asahi Chem Ind Co Ltd | Molding resin composition |
| JPS5984940A (en) * | 1982-11-05 | 1984-05-16 | Showa Denko Kk | Polyethylene composition having high melt tension |
| BE898469A (en) * | 1982-12-20 | 1984-03-30 | El Paso Polyolefins | Heat sterilizable polyolefin compositions and articles made therefrom. |
| JPH0788446B2 (en) * | 1986-08-07 | 1995-09-27 | 旭化成工業株式会社 | Resin composition for film molding |
| US4839228A (en) * | 1987-02-04 | 1989-06-13 | The Dow Chemical Company | Biconstituent polypropylene/polyethylene fibers |
| US5133917A (en) * | 1986-09-19 | 1992-07-28 | The Dow Chemical Company | Biconstituent polypropylene/polyethylene fibers |
| JPH07716B2 (en) * | 1987-10-09 | 1995-01-11 | 昭和電工株式会社 | Method for producing thermoplastic resin composition |
| JP2819139B2 (en) * | 1989-01-12 | 1998-10-30 | 大日本印刷株式会社 | Easy opening resin composition for heat sealing |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52130875A (en) * | 1976-04-28 | 1977-11-02 | Mitsui Petrochem Ind Ltd | Production of composite films |
| JPS5446252A (en) * | 1977-09-19 | 1979-04-12 | Sumitomo Chem Co Ltd | Polypropylene resin composition for extrusion coating |
| JPS5757740A (en) * | 1980-09-24 | 1982-04-07 | Mitsubishi Petrochem Co Ltd | Propylene resin composition |
-
1982
- 1982-05-28 JP JP8982082A patent/JPS58206647A/en active Granted
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS52130875A (en) * | 1976-04-28 | 1977-11-02 | Mitsui Petrochem Ind Ltd | Production of composite films |
| JPS5446252A (en) * | 1977-09-19 | 1979-04-12 | Sumitomo Chem Co Ltd | Polypropylene resin composition for extrusion coating |
| JPS5757740A (en) * | 1980-09-24 | 1982-04-07 | Mitsubishi Petrochem Co Ltd | Propylene resin composition |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS58206647A (en) | 1983-12-01 |
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