JP2000248125A - Polyethylene resin composition for container - Google Patents
Polyethylene resin composition for containerInfo
- Publication number
- JP2000248125A JP2000248125A JP5194099A JP5194099A JP2000248125A JP 2000248125 A JP2000248125 A JP 2000248125A JP 5194099 A JP5194099 A JP 5194099A JP 5194099 A JP5194099 A JP 5194099A JP 2000248125 A JP2000248125 A JP 2000248125A
- Authority
- JP
- Japan
- Prior art keywords
- polyethylene resin
- mfr
- hlmfr
- resin composition
- density
- 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
Links
Landscapes
- Containers Having Bodies Formed In One Piece (AREA)
- Injection Moulding Of Plastics Or The Like (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
Description
【０００１】[0001]
【発明の属する技術分野】本発明は、炭酸飲料等の液体
などを収容する容器用ポリエチレン樹脂組成物であり、
詳しくは成形性、高流動性、臭い、剛性と耐衝撃性との
バランス、滑り性、食品安全性に優れ、かつ内容物等か
ら起因して生じる容器の内圧に耐え得る耐ストレスクラ
ック性を有するポリエチレン樹脂組成物である。[0001] The present invention relates to a polyethylene resin composition for containers containing liquids such as carbonated beverages,
Specifically, it has excellent moldability, high fluidity, odor, balance between rigidity and impact resistance, excellent slipperiness, food safety, and has stress crack resistance that can withstand the internal pressure of the container caused by contents etc. It is a polyethylene resin composition.
【０００２】[0002]
【従来の技術】従来、清涼飲料水、炭酸飲料水等の容器
としては、容器本体としてポリエチレンテレフタレート
（ＰＥＴ）製のものが、その蓋（キャップ）としてアル
ミニウム金属製のものが広く用いられている。しかし近
年、リサイクル性等の環境保全の観点からポリオレフィ
ンの適用が検討されている。その際、特に炭酸飲料水用
のキャップとしては、ポリエチレンは容器内圧によりス
トレスクラックが発生するおそれがあるので、ポリプロ
ピレンが用いられる場合が大半である。2. Description of the Related Art Conventionally, as containers for soft drinks, carbonated drinks and the like, those made of polyethylene terephthalate (PET) as a container body and those made of aluminum metal as a lid (cap) have been widely used. . However, in recent years, application of polyolefin has been studied from the viewpoint of environmental conservation such as recyclability. At that time, particularly as a cap for carbonated drinking water, polypropylene is mostly used because polyethylene may cause stress cracks due to the internal pressure of the container.
【０００３】[0003]
【発明が解決しようとする課題】近年、成形サイクルを
短縮して、生産効率を上げるという要求が高くなってい
る。そこで、高流動性のポリオレフィンにて射出成形お
よび圧縮成形を行う試みがなされるようになり、ポリエ
チレンが、ポリプロピレンに比べて融点が低いため、成
形サイクルを短縮できる点で見直されるようになった。
また、ポリエチレンは、キャップ開閉時の滑り性も良好
であるという利点もある。しかし、炭酸飲料容器の蓋用
については、その容器内の圧力によりポリエチレン製キ
ャップではストレスクラックの問題がある。また、経済
上の理由からキャップの肉厚を薄くすることも要求され
る一方、内圧による変形でシール部からの炭酸ガスの漏
れを防止すべく高い剛性をも求められており、これらの
要求を満たすポリエチレン樹脂製の容器は未だ実現され
ていない。In recent years, there has been an increasing demand for shortening the molding cycle and increasing the production efficiency. Attempts have been made to perform injection molding and compression molding with high flowable polyolefins, and polyethylene has been reexamined in that the melting cycle can be shortened since polyethylene has a lower melting point than polypropylene.
Polyethylene also has the advantage that it has good slipperiness when opening and closing the cap. However, for a lid of a carbonated beverage container, there is a problem of a stress crack in a polyethylene cap due to the pressure in the container. In addition, while it is required to reduce the thickness of the cap for economic reasons, high rigidity is also required to prevent leakage of carbon dioxide gas from the seal due to deformation due to internal pressure. Filling containers made of polyethylene resin have not been realized yet.
【０００４】例えば２種類のポリエチレンを順次重合す
ることにより得られるポリエチレン組成物は耐ストレス
クラック性、耐衝撃性等を向上できるものがあり、コン
テナー、ボトル、フィルム等に使用されているが、高速
成形に対応し得る高流動性、炭酸飲料容器の内圧に耐え
得る剛性を満足するものが得られず、炭酸飲料用キャッ
プには使用されていない。また、近年の高速成形機によ
る、成形サイクル向上を考えた場合の流動性を重視した
ポリエチレンではストレスクラック性が不足する。ま
た、剛性を重視した高密度のポリエチレンも耐ストレス
クラック性は劣る。例えば特開昭５８−１０３５４２号
公報に記載された組成物では、ストレスクラック性を保
持しながら、高サイクル成形および高剛性は困難であ
る。このような背景の下、炭酸飲料用キャップとして、
ポリエチレンが使用されていないのが現状である。本発
明は前記課題を解決するためになされたもので、成形
性、高流動性、剛性および耐ストレスクラック性等の全
ての性能を満たす容器用のポリエチレン樹脂組成物を目
的とするものである。For example, a polyethylene composition obtained by sequentially polymerizing two kinds of polyethylene can improve stress crack resistance, impact resistance, etc., and is used for containers, bottles, films and the like. A product that satisfies the high fluidity that can be molded and the rigidity that can endure the internal pressure of the carbonated beverage container cannot be obtained, and is not used for a carbonated beverage cap. In addition, in recent years, polyethylene which emphasizes fluidity when considering a molding cycle by a high-speed molding machine has insufficient stress cracking properties. Also, high-density polyethylene, which emphasizes rigidity, is inferior in stress crack resistance. For example, in the composition described in JP-A-58-103542, high cycle molding and high rigidity are difficult while maintaining stress cracking properties. Under such a background, as a cap for carbonated drinks,
At present, polyethylene is not used. The present invention has been made in order to solve the above-mentioned problems, and an object of the present invention is to provide a polyethylene resin composition for a container, which satisfies all performances such as moldability, high fluidity, rigidity, and stress crack resistance.
【０００５】[0005]
【課題を解決するための手段】本発明の容器用ポリエチ
レン樹脂組成物は、その容器本体及び又は蓋用のもので
あって、荷重２.１６ｋｇにおけるＭＦＲが０.８〜５g/
10min、かつ、荷重２１.６ｋｇにおけるＨＬＭＦＲが１
８０g/10min以上、かつ、ＨＬＭＦＲ／ＭＦＲが８０以
上であることを特徴とするものである。ここで、さらに
下記要件（ａ）〜（ｄ）を満足するものが望ましい。 （ａ）密度が０.９５３ｇ／ｃｍ3以上 （ｂ）射出成形試料の曲げ弾性率が１１０００ｋｇｆ／
ｃｍ2以上 （ｃ）射出成形試料の耐定ひずみストレスクラック性が
４０時間以上 （ｄ）キャピラリーレオメーターにおいて、２００℃測
定時、剪断速度２００sec-1での溶融粘度が４０００poi
se以下 さらにまた、ＨＬＭＦＲが０.５〜２.０g/10min、密度
が０.９３０ｇ／ｃｍ3以下のポリエチレン樹脂を１０重
量％以上且つ３０重量％未満と、ＭＦＲが４００g/10mi
n以上、密度が０.９６０ｇ／ｃｍ3以上のポリエチレン
樹脂を７０重量％より多く且つ９０重量％以下とを含有
してなるものが望ましい。The polyethylene resin composition for a container according to the present invention is for a container body and / or a lid, and has an MFR of 0.8 to 5 g / at a load of 2.16 kg.
HLMFR at 10min and 21.6kg load is 1
80 g / 10 min or more, and HLMFR / MFR is 80 or more. Here, those that further satisfy the following requirements (a) to (d) are desirable. (A) The density is 0.953 g / cm 3 or more. (B) The flexural modulus of the injection molded sample is 11,000 kgf / cm.
cm 2 or more (c) Constant strain stress crack resistance of the injection molded sample is 40 hours or more. (d) Melt viscosity at a shear rate of 200 sec -1 at 200 ° C. in a capillary rheometer is 4000 poi.
If se is less than 10% by weight and less than 30% by weight of a polyethylene resin having an HLMFR of 0.5 to 2.0 g / 10 min and a density of 0.930 g / cm 3 or less, the MFR is 400 g / 10 mi.
Desirably, the resin contains more than 70% by weight and not more than 90% by weight of a polyethylene resin having a density of 0.960 g / cm 3 or more with n or more.
【０００６】[0006]
【発明の実施の形態】本発明に係るポリエチレン樹脂組
成物を構成するポリエチレン樹脂は、チグラー触媒、フ
ィリップス触媒、メタロセン触媒等で重合されるエチレ
ン単独あるいはエチレンと炭素数３〜１８のα−オレフ
ィンから選ばれる１種またはそれ以上のコモノマーとの
共重合体である。α−オレフィンの代表例としては例え
ばプロピレン、１-ブテン、１-ヘキセン、１-オクテ
ン、４-メチル-１ペンテン等が挙げられる。BEST MODE FOR CARRYING OUT THE INVENTION The polyethylene resin constituting the polyethylene resin composition according to the present invention is composed of ethylene alone polymerized by a Ziegler catalyst, a Phillips catalyst, a metallocene catalyst or the like, or ethylene and an α-olefin having 3 to 18 carbon atoms. It is a copolymer with one or more selected comonomers. Representative examples of the α-olefin include, for example, propylene, 1-butene, 1-hexene, 1-octene, 4-methyl-1-pentene and the like.
【０００７】本発明のポリエチレン樹脂組成物は、荷重
２.１６ｋｇにおけるＭＦＲが０.８〜５g/10min、好ま
しくは１〜４g/10min、より好ましくは２〜３g/10minの
範囲であり、かつ、荷重２１.６ｋｇにおけるＨＬＭＦ
Ｒが１８０g/10min以上であることが必要である。ＨＬ
ＭＦＲは好ましくは２００〜３８０g/10minである。Ｍ
ＦＲが０.８〜５g/10minの範囲であってもＨＬＭＦＲが
１８０g/10min未満であれば高速成形性が劣る。また、
ＭＦＲが５g/10minを超えれば、ＨＬＭＦＲが１８０g/1
0min以上であっても、耐ストレスクラック性が劣り、
０.８g/10min未満ではＨＬＭＦＲが１８０g/10min以上
を達成することは困難であり、当然ながら高速成形性が
劣る。さらに、ＨＬＭＦＲ／ＭＦＲが８０以上である。
ＨＬＭＦＲ／ＭＦＲの比率を８０以上とすることによ
り、高速成形性（流動性）と耐ストレスクラック性のバ
ランスを向上させることができる。The polyethylene resin composition of the present invention has an MFR at a load of 2.16 kg of 0.8 to 5 g / 10 min, preferably 1 to 4 g / 10 min, more preferably 2 to 3 g / 10 min, and HLMF at a load of 21.6 kg
R needs to be 180 g / 10 min or more. HL
The MFR is preferably from 200 to 380 g / 10 min. M
Even if the FR is in the range of 0.8 to 5 g / 10 min, if the HLMFR is less than 180 g / 10 min, the high-speed moldability is poor. Also,
If MFR exceeds 5g / 10min, HLMFR will be 180g / 1
Even at 0 min or more, the stress crack resistance is poor,
If it is less than 0.8 g / 10 min, it is difficult to achieve an HLMFR of 180 g / 10 min or more, and naturally high-speed moldability is inferior. Further, HLMFR / MFR is 80 or more.
When the ratio of HLMFR / MFR is 80 or more, the balance between high-speed moldability (fluidity) and stress crack resistance can be improved.
【０００８】（ａ）さらに、本発明のポリエチレン樹脂
組成物にあっては、その密度が０.９５３ｇ／ｃｍ3以
上、好ましくは０.９５５ｇ／ｃｍ3以上であることが望
ましい。また、０.９７ｇ／ｃｍ3以下であることが好ま
しい。密度が０.９５３ｇ／ｃｍ3に達しないものは剛性
が劣り、容器の内圧によりキャップが変形し易くなるか
らである。 （ｂ）ポリエチレン樹脂組成物は射出成形により成形し
た試料の曲げ弾性率が１１０００ｋｇｆ／ｃｍ2以上で
あることが望ましい。より望ましくは１２０００ｋｇｆ
／ｃｍ2以上である。曲げ弾性率が１１０００ｋｇｆ／
ｃｍ2に達しないものは剛性が劣り、容器の内圧により
キャップが変形しやすくなる。本発明において曲げ弾性
率測定用試験片は射出成形にて２１０℃で６.４×１２.
４×１２７ｍｍの試験片を作製し、JIS-K7203準拠にて
行なうものである。 （ｃ）ポリエチレン樹脂組成物の耐定ひずみストレスク
ラック性（ＥＳＣＲ）は４０時間以上であることが望ま
しい。これは一定ひずみ下での耐ストレスクラック性で
あり、具体的にはＪＩＳ−Ｋ６７６０に従うものであ
る。試料は２１０℃にて１３０×１３０×２mmの寸法で
の射出成形された板から切り出したものである。 （ｄ）ポリエチレン樹脂組成物は、キャピラリーレオメ
ーターにおいて、２００℃測定時、剪断速度２００sec
-1の溶融粘度が４０００poise以下、好ましくは３５０
０poise以下である。本発明においてはインテスコ社製
キャピラリーレオメーターを用い、径１.０ｍｍ，Ｌ／
Ｄ＝２０のキャピラリーを用い、２００℃の温度にて測
定し、剪断速度２００sec-1での粘度をここで述べる溶
融粘度とする。溶融粘度が４０００poise以下とするこ
とにより、ショートショットが生じにくくなって高速射
出成形性が向上し、また、延展性が向上するので圧縮成
形に好適なものとなる。(A) Further, the polyethylene resin composition of the present invention preferably has a density of 0.953 g / cm 3 or more, preferably 0.955 g / cm 3 or more. Further, it is preferably 0.97 g / cm 3 or less. If the density does not reach 0.953 g / cm 3 , the rigidity is poor, and the cap is easily deformed by the internal pressure of the container. (B) It is desirable that the polyethylene resin composition has a flexural modulus of a sample formed by injection molding of 11,000 kgf / cm 2 or more. More preferably, 12000kgf
/ Cm 2 or more. Flexural modulus is 11000kgf /
Those not reaching cm 2 have poor rigidity, and the cap is easily deformed by the internal pressure of the container. In the present invention, the test piece for measuring the flexural modulus is 6.4 × 12 at 210 ° C. by injection molding.
A test piece of 4 × 127 mm is prepared and performed in accordance with JIS-K7203. (C) The polyethylene resin composition preferably has a constant strain stress crack resistance (ESCR) of 40 hours or more. This is stress crack resistance under a constant strain, and specifically conforms to JIS-K6760. Samples were cut from injection molded plates at 210 ° C. with dimensions 130 × 130 × 2 mm. (D) The polyethylene resin composition was subjected to a shear rate of 200 sec when measured at 200 ° C. in a capillary rheometer.
-1 is less than 4000 poise, preferably 350
0 poise or less. In the present invention, a capillary rheometer manufactured by Intesco Corp.
It is measured at a temperature of 200 ° C. using a capillary of D = 20, and the viscosity at a shear rate of 200 sec −1 is defined as a melt viscosity described herein. By setting the melt viscosity to 4000 poise or less, short shots are less likely to occur and high-speed injection moldability is improved, and spreadability is improved, making the composition suitable for compression molding.
【０００９】本発明のポリエチレン樹脂組成物は、後述
する（Ａ）成分を１０重量％以上で３０重量％未満、好
ましくは２０重量％以上で３０重量％未満と、（Ｂ）成
分を７０重量％よりも多くして９０重量％以下、好まし
くは７０重量％よりも多く８０重量％以下のものを順次
重合して得られ、またそのようなものが望ましい。ま
た、別々に重合して後でブレンドすることも可能であ
る。ここで、成分（Ａ）を１０重量％以上とすることに
より耐ストレスクラック性が向上し、３０重量％未満と
することにより成形性が向上する。（Ａ）成分は、ＨＬ
ＭＦＲが０.５〜２g/10min、好ましくは０.８〜１.５g/
10min、密度が０.９３０ｇ／ｃｍ3以下のポリエチレン
樹脂であり、（Ｂ）成分はＭＦＲが４００g/10min以
上、密度が０.９６０ｇ／ｃｍ3以上のポリエチレン樹脂
である。ここで（Ａ）成分のＨＬＭＦＲが０.５g/10min
未満の場合は流動性が悪化し成形性が不良となったり、
２.０g/10minを超える場合は耐ストレスクラック性が悪
化したりする虞がある。（Ａ）成分の密度が０.９３０
ｇ／ｃｍ3を超える場合は耐ストレスクラック性が悪く
なる虞がある。また、（Ｂ）成分のＭＦＲが４００g/10
min未満の場合は流動性が悪化したり、密度が０.９６０
ｇ／ｃｍ3未満の場合は剛性が低下する虞がある。The polyethylene resin composition of the present invention contains the component (A) described below in an amount of 10% by weight or more and less than 30% by weight, preferably 20% by weight or more and less than 30% by weight, and the component (B) in an amount of 70% by weight. More than 90% by weight, preferably more than 70% by weight and up to 80% by weight are sequentially polymerized, and such is desirable. It is also possible to polymerize them separately and blend them later. Here, when the component (A) is at least 10% by weight, the stress crack resistance will be improved, and when it is less than 30% by weight, the moldability will be improved. The component (A) is HL
MFR is 0.5 to 2 g / 10 min, preferably 0.8 to 1.5 g / min.
It is a polyethylene resin having a density of 0.930 g / cm 3 or less for 10 min, and the component (B) is a polyethylene resin having an MFR of 400 g / 10 min or more and a density of 0.960 g / cm 3 or more. Here, the HLMFR of the component (A) is 0.5 g / 10 min.
If less, the flowability deteriorates and the moldability becomes poor,
If it exceeds 2.0 g / 10 min, the stress crack resistance may deteriorate. The component (A) has a density of 0.930.
If it exceeds g / cm 3 , the stress crack resistance may deteriorate. Further, the MFR of the component (B) is 400 g / 10
If it is less than min, the fluidity deteriorates or the density becomes 0.960.
If it is less than g / cm 3 , the rigidity may decrease.
【００１０】上記樹脂組成物には本発明の効果を著しく
損なわない範囲で添加剤等を添加しても良い。添加剤と
して、例えば酸化防止剤(フェノール系、リン系、イオ
ウ系)、滑剤、帯電防止剤、光安定剤、紫外線吸収剤等
がある。上記樹脂組成物は連続的に多段重合で重合して
も良いが、別々に重合した後ブレンドして得ることも可
能である。この場合は必要に応じ各種添加剤を配合し、
混練押出機、バンバリーミキサー等にて混練し、成形用
材料とする。[0010] Additives and the like may be added to the resin composition as long as the effects of the present invention are not significantly impaired. Examples of the additives include antioxidants (phenol-based, phosphorus-based, and sulfur-based), lubricants, antistatic agents, light stabilizers, and ultraviolet absorbers. The above resin composition may be continuously polymerized by multistage polymerization, or may be separately polymerized and then blended. In this case, mix various additives as necessary,
The mixture is kneaded with a kneading extruder, a Banbury mixer or the like to obtain a molding material.
【００１１】本発明に係るポリエチレン樹脂組成物は、
容器の容器本体または蓋用であり、特に蓋への適用に適
しているものである。成形法としては、必ずしも限られ
るものではなく周知の種々の樹脂成形法を適用でき、中
でも、射出成形、圧縮成形等が最も好ましく用いられ
る。The polyethylene resin composition according to the present invention comprises:
It is for a container body or a lid of a container, and is particularly suitable for application to a lid. The molding method is not necessarily limited, and various well-known resin molding methods can be applied. Among them, injection molding, compression molding and the like are most preferably used.
【００１２】[0012]
【実施例】下記実施例、比較例でのポリエチレン樹脂組
成物の測定法は以下の通りである。 ＭＦＲ： ＪＩＳ−Ｋ６７６０ 密度 ： ＪＩＳ−Ｋ６７６０ 曲げ弾性率： ＪＩＳ−Ｋ７２０３ 定ひずみストレスクラック性（ＥＳＣＲ）： ＪＩＳ−
Ｋ６７６０ 持続耐圧試験：ＰＥＴ瓶に炭酸飲料をいれ、各実施例等
のポリエチレン樹脂組成物で成形したキャップで閉栓
し、５０℃にて１ヶ月放置後に、キャップにおけるクラ
ックの有無を調べ、ないものを○、あったものを×で示
した。 溶融粘度：キャピラリーレオメーター（インテスコ社
製）を用い、径1.0mm,L/D=20のキャピラリーを用い、２
００℃の温度にて測定し、剪断速度２００sec-1での粘
度を測定した。 成形性；高速で成形できるかどうかを評価し、良好なも
のを○、不適当なものを×で示した。 射出成形試料作成条件： 成形機；ファナック社製「ファナック１００Ｂ」 成形温度；２３０℃ 射出速度；３５ｍｍ／ｓｅｃ 保圧；４００ｋｇ/cm2 冷却温度；４０℃ 冷却時間；２０ｓｅｃThe method of measuring the polyethylene resin composition in the following examples and comparative examples is as follows. MFR: JIS-K6760 Density: JIS-K6760 Flexural modulus: JIS-K7203 Constant strain stress cracking (ESCR): JIS-
K6760 Continuous pressure resistance test: A carbonated beverage is put in a PET bottle, closed with a cap formed of the polyethylene resin composition of each example, etc., left at 50 ° C. for one month, and then checked for cracks in the cap. 、, what was present is indicated by ×. Melt viscosity: Using a capillary rheometer (manufactured by Intesco), using a capillary with a diameter of 1.0 mm and L / D = 20, 2
The viscosity was measured at a temperature of 00 ° C., and the viscosity at a shear rate of 200 sec −1 was measured. Moldability: It was evaluated whether molding could be performed at high speed. Good was indicated by 、, and inappropriate was indicated by ×. Injection molding sample preparation conditions: Molding machine; FANUC 100B manufactured by FANUC Molding temperature; 230 ° C Injection speed; 35 mm / sec Holding pressure; 400 kg / cm 2 Cooling temperature; 40 ° C Cooling time; 20 sec
【００１３】［実施例１］チグラー触媒を用いてコモノ
マーとしてブテン−１を用いスラリー重合法により連続
的に２段重合で表１に示したように成分（Ａ）を重合
後、成分（Ｂ）を重合して樹脂組成物を得た。その配合
比、組成物のＭＦＲ、ＨＬＭＦＲとともに各測定値も併
せて示した。実施例１のポリエチレン樹脂組成物は、曲
げ弾性率、衝撃強度、耐ストレスクラック性、成形性、
持続耐圧試験のいずれも良好であった。 ［実施例２〜実施例４］表１に示した各成分、コモノマ
ーを用いて実施例１と同様に行った。表１に示したよう
に、曲げ弾性率、衝撃強度、耐ストレスクラック性、成
形性、持続耐圧試験のいずれも良好であった。Example 1 Component (A) was polymerized as shown in Table 1 by continuous two-stage polymerization by a slurry polymerization method using butene-1 as a comonomer using a Ziegler catalyst, followed by component (B). Was polymerized to obtain a resin composition. The measured values are shown together with the compounding ratio, the MFR and HLMFR of the composition. The polyethylene resin composition of Example 1 has flexural modulus, impact strength, stress crack resistance, moldability,
All of the sustained pressure tests were good. [Examples 2 to 4] The same procedure as in Example 1 was carried out using each component and comonomer shown in Table 1. As shown in Table 1, the flexural modulus, impact strength, stress crack resistance, moldability, and sustained pressure test were all good.
【００１４】［比較例１］ＭＦＲ、ＨＬＭＦＲ、ＨＬＭ
ＦＲ／ＭＦＲが小さい組成物を用いて実施例１と同様に
行った。その結果、耐ストレスクラック性、成形性、持
続耐圧試験が不良であった。 ［比較例２］ＨＬＭＦＲ、ＨＬＭＦＲ／ＭＦＲが小さい
組成物を用いて実施例１と同様に行った。耐ストレスク
ラック性、成形性、持続耐圧試験が不良であった。 ［比較例３］ＨＬＭＦＲ、ＨＬＭＦＲ／ＭＦＲが小さい
組成物を用いて実施例１と同様に行った。耐ストレスク
ラック性、成形性、持続耐圧試験が不良であった。 ［比較例４］ＨＬＭＦＲ／ＭＦＲが小さい組成物を用い
て実施例１と同様に行った。耐ストレスクラック性、持
続耐圧試験が不良であった。 ［比較例５］（Ａ）成分のみからなるＭＦＲが大きく、
ＨＬＭＦＲ／ＭＦＲが小さい組成物を用いて実施例１と
同様に行った。流動性と耐ストレスクラック性のバラン
スおよび持続耐圧試験が不良であった。 ［比較例６］ＭＦＲ、ＨＬＭＦＲが低く、密度が低く曲
げ弾性率の劣る組成物を用いて実施例１と同様に行っ
た。成形性が不良であった。Comparative Example 1 MFR, HLMFR, HLM
It carried out similarly to Example 1 using the composition with a small FR / MFR. As a result, the stress crack resistance, moldability, and sustained pressure test were poor. Comparative Example 2 The same operation as in Example 1 was performed using a composition having a small HLMFR and a small HLMFR / MFR. The stress crack resistance, moldability, and sustained pressure test were poor. Comparative Example 3 The same operation as in Example 1 was performed using a composition having a small HLMFR and a small HLMFR / MFR. The stress crack resistance, moldability, and sustained pressure test were poor. Comparative Example 4 The same operation as in Example 1 was performed using a composition having a small HLMFR / MFR. The stress crack resistance and the continuous pressure resistance test were poor. [Comparative Example 5] The MFR comprising only the component (A) was large,
It carried out similarly to Example 1 using the composition with small HLMFR / MFR. The balance between fluidity and stress crack resistance and the continuous pressure test were poor. Comparative Example 6 The same operation as in Example 1 was performed using a composition having a low MFR and HLMFR, a low density, and a low flexural modulus. Moldability was poor.
【００１５】[0015]
【表１】 [Table 1]
【００１６】[0016]
【表２】 [Table 2]
【００１７】[0017]
【発明の効果】本発明の容器用ポリエチレン樹脂組成物
であると、高流動性で成形性に優れ、サイクルを短縮し
て、生産効率を上げることができる。また、剛性と耐衝
撃性のバランス、耐ストレスクラック性に優れ、炭酸飲
料等による内圧が高くなるものを内容物とする容器にも
対応できる。しかも、臭いやブリードアウトも殆どな
く、飲食品用の容器に適合できる。従って、炭酸飲料や
ビール用の容器、特にその蓋に好適である。また、リサ
イクル性に優れて環境適性が良好な上、軽量、安価で、
また、滑り性も良好で使い勝手も良い。According to the polyethylene resin composition for containers of the present invention, high fluidity and excellent moldability can be obtained, the cycle can be shortened, and the production efficiency can be increased. Further, it is excellent in the balance between rigidity and impact resistance, and excellent in stress crack resistance, and can be used for a container having a content of a carbonated beverage or the like whose internal pressure is increased. Moreover, there is almost no smell or bleed-out, and it can be applied to containers for food and drink. Therefore, it is suitable for containers for carbonated beverages and beers, especially for lids thereof. In addition, it has excellent recyclability and good environmental suitability, and is lightweight and inexpensive.
In addition, it has good sliding properties and is easy to use.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 管野 四十四 神奈川県川崎市川崎区夜光二丁目３番２号 日本ポリオレフィン株式会社川崎研究所 内 (72)発明者 佐藤 直人 神奈川県川崎市川崎区夜光二丁目３番２号 日本ポリオレフィン株式会社川崎研究所 内 Ｆターム(参考） 3E033 BA15 CA03 CA06 FA02 GA02 4F206 AA04C AG07 JA07 4J002 BB031 BB032 BB051 FD040 FD050 FD070 FD100 FD170 GG01 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor, Forty-fourty-fourty Kanno Prefecture, Kawasaki-ku, Kawasaki-ku, 2-3-2, Yakko, Japan Polyolefin Co., Ltd.Kawasaki Research Institute (72) Inventor Naoto Sato No. 3-2, Yakko 2-chome F-term (reference) in Kawasaki Laboratory, Japan Polyolefin Co., Ltd. 3E033 BA15 CA03 CA06 FA02 GA02 4F206 AA04C AG07 JA07 4J002 BB031 BB032 BB051 FD040 FD050 FD070 FD100 FD170 GG01
Claims (3)
脂組成物において、荷重２.１６ｋｇにおけるＭＦＲが
０.８〜５g/10min、かつ、荷重２１.６ｋｇにおけるＨ
ＬＭＦＲが１８０g/10min以上、かつ、ＨＬＭＦＲ／Ｍ
ＦＲが８０以上であることを特徴とする容器用ポリエチ
レン樹脂組成物。1. A polyethylene resin composition for a container main body and / or a lid, wherein the MFR at a load of 2.16 kg is 0.8 to 5 g / 10 min and the HFR at a load of 21.6 kg.
LMFR is more than 180g / 10min and HLMFR / M
A polyethylene resin composition for containers, wherein FR is 80 or more.
ることを特徴とする請求項１記載の容器用ポリエチレン
樹脂組成物。 （ａ）密度が０.９５３ｇ／ｃｍ3以上 （ｂ）射出成形試料の曲げ弾性率が１１０００ｋｇｆ／
ｃｍ2以上 （ｃ）射出成形試料の耐定ひずみストレスクラック性が
４０時間以上 （ｄ）キャピラリーレオメーターにおいて、２００℃測
定時、剪断速度２００sec-1での溶融粘度が４０００poi
se以下2. The polyethylene resin composition for a container according to claim 1, further satisfying the following requirements (a) to (d). (A) The density is 0.953 g / cm 3 or more. (B) The flexural modulus of the injection molded sample is 11,000 kgf / cm.
cm 2 or more (c) Constant strain stress crack resistance of the injection molded sample is 40 hours or more. (d) Melt viscosity at a shear rate of 200 sec -1 at 200 ° C. in a capillary rheometer is 4000 poi.
se or less
度が０.９３０ｇ／ｃｍ3以下のポリエチレン樹脂を１０
重量％以上且つ３０重量％未満と、ＭＦＲが４００g/10
min以上、密度が０.９６０ｇ／ｃｍ3以上のポリエチレ
ン樹脂を７０重量％より多く且つ９０重量％以下とを含
有することを特徴とする請求項１または２記載の容器用
ポリエチレン樹脂組成物。 3. A polyethylene resin having an HLMFR of 0.5 to 2.0 g / 10 min and a density of 0.930 g / cm 3 or less is used.
MFR of 400 g / 10 when it is not less than 30% by weight and not less than 30% by weight
min or more, according to claim 1 or 2 containers for the polyethylene resin composition, wherein the density containing a 0.960 g / cm 3 or more polyethylene resins of and more than 70 wt% 90 wt% or less.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05194099A JP3454741B2 (en) | 1999-02-26 | 1999-02-26 | Polyethylene resin composition for containers |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP05194099A JP3454741B2 (en) | 1999-02-26 | 1999-02-26 | Polyethylene resin composition for containers |
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| Publication Number | Publication Date |
|---|---|
| JP2000248125A true JP2000248125A (en) | 2000-09-12 |
| JP3454741B2 JP3454741B2 (en) | 2003-10-06 |
Family
ID=12900877
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP05194099A Expired - Lifetime JP3454741B2 (en) | 1999-02-26 | 1999-02-26 | Polyethylene resin composition for containers |
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| Country | Link |
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| JP (1) | JP3454741B2 (en) |
Cited By (6)
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|---|---|---|---|---|
| JP2005320526A (en) * | 2004-04-06 | 2005-11-17 | Nippon Polyethylene Kk | Polyethylene resin for container cap |
| JP2009535490A (en) * | 2006-05-02 | 2009-10-01 | ダウ グローバル テクノロジーズ インコーポレイティド | High density polyethylene composition, method of making the same, product made therefrom, and method of making such product |
| CN101104715B (en) * | 2006-07-14 | 2011-08-17 | 日本聚乙烯株式会社 | Polyethylene-based resin molding material |
| WO2011126029A1 (en) * | 2010-04-06 | 2011-10-13 | 日本ポリエチレン株式会社 | Polyethylene resin molding material for container lid |
| WO2013118749A1 (en) * | 2012-02-07 | 2013-08-15 | 日本ポリエチレン株式会社 | Polyethylene-based resin composition for container lid, and container lid |
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1999
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| JP2005320526A (en) * | 2004-04-06 | 2005-11-17 | Nippon Polyethylene Kk | Polyethylene resin for container cap |
| JP4564876B2 (en) * | 2004-04-06 | 2010-10-20 | 日本ポリエチレン株式会社 | Polyethylene resin for container lid |
| JP2009535490A (en) * | 2006-05-02 | 2009-10-01 | ダウ グローバル テクノロジーズ インコーポレイティド | High density polyethylene composition, method of making the same, product made therefrom, and method of making such product |
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| US11447620B2 (en) | 2007-05-02 | 2022-09-20 | Dow Global Technologies Llc | High-density polyethylene compositions, method of making the same, injection molded articles made therefrom, and method of making such articles |
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