JP2000033925A - Oriented polypropyrene container - Google Patents

Oriented polypropyrene container

Info

Publication number
JP2000033925A
JP2000033925A JP10206399A JP20639998A JP2000033925A JP 2000033925 A JP2000033925 A JP 2000033925A JP 10206399 A JP10206399 A JP 10206399A JP 20639998 A JP20639998 A JP 20639998A JP 2000033925 A JP2000033925 A JP 2000033925A
Authority
JP
Japan
Prior art keywords
resin
ethylene
container
master batch
melting point
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.)
Pending
Application number
JP10206399A
Other languages
Japanese (ja)
Inventor
Tomoaki Takasaki
智明 高崎
Masao Kobayashi
正男 小林
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.)
Toppan Inc
Original Assignee
Toppan Printing Co Ltd
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 Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP10206399A priority Critical patent/JP2000033925A/en
Publication of JP2000033925A publication Critical patent/JP2000033925A/en
Pending legal-status Critical Current

Links

Abstract

PROBLEM TO BE SOLVED: To improve the low-temperature impact resistant strength of an oriented blow molded container, the dispersibility of additive such as pigment, etc., by adding a master batch consisting of a base resin whose melting point is lower than that of a polypropylene resin to the polypropylene resin copolymerized with an ethylene. SOLUTION: In a container in which a biaxially oriented polypropylene resin copolymerized with an ethylene is blow molded, a resin containing an ethylene which is thermally bonded with a resin for biaxially oriented blow molding and whose melting point is lower than that of the resin by at least 10 deg.C is used for a base resin of a master batch. In a process in which a blend of the polypropylene resin with the master batch is melted and kneaded, the master batch of low melting point is first melted to package polypropylene resin pellets, and the impact resistance becomes excellent, and the dispersibility of a coloring agent, a charge preventing agent, a ultraviolet ray absorbing agent, and other additives can be remarkably dispersed.

Description

【発明の詳細な説明】DETAILED DESCRIPTION OF THE INVENTION

【0001】[0001]

【発明の属する技術分野】本発明は、顔料、帯電防止
剤、紫外線吸収剤等の添加剤の分散性、耐低温衝撃性に
優れた延伸ポリプロピレン容器に関する。
The present invention relates to a drawn polypropylene container excellent in dispersibility of additives such as a pigment, an antistatic agent and an ultraviolet absorber and excellent in low-temperature impact resistance.

【0002】[0002]

【従来の技術】ポリプロピレンブロー容器は安価で、防
湿性、耐熱性、耐薬品性といった優れた諸物性から食
品、トイレタリー、洗剤、医薬品などの容器として広く
使用されている。これらのポリプロピレンブロー容器の
ほとんどがダイレクトブロー成形によるものである。ま
た近年、ゴミの量のを削減が求められており、プラスチ
ック容器においても使用後の容器の易廃棄を向上するた
め、軽量化が求められている。しかし、ダイレクトブロ
ーポリプロピレン容器では、軽量化に伴い、低温での落
下等の衝撃強度が著しく低下する問題がある。
2. Description of the Related Art Blown polypropylene containers are inexpensive and have been widely used as containers for foods, toiletries, detergents, pharmaceuticals, etc. due to their excellent physical properties such as moisture resistance, heat resistance and chemical resistance. Most of these polypropylene blow containers are made by direct blow molding. In recent years, there has been a demand for reducing the amount of refuse, and there has been a demand for weight reduction of plastic containers in order to improve the easy disposal of used containers. However, in the direct blow polypropylene container, there is a problem that the impact strength such as dropping at a low temperature is remarkably reduced as the weight is reduced.

【0003】この対策としてポリプロピレン樹脂を延伸
ブロー成形する方法がある。この方法を用いると、従来
のダイレクトブローポリプロピレン容器に比べ、低温衝
撃強度を幾分向上できるが、容器の形状、軽量化率によ
っては、不十分な状態である。二軸延伸ポリプロピレン
容器の低温衝撃強度を向上する方法としては、ポリプロ
ピレン樹脂にポリエチレン樹脂をドライブレンドする方
法があるが、着色剤あるいは帯電防止剤、紫外線吸収
剤、その他の添加剤の単独又は複合物より成るマスター
バッチを添加する際にはポリプロピレン樹脂に対するブ
レンド工程が多くなり均一分散性、価格の面で実用的で
ない。また、軽量化により容器壁面の厚みが薄くなる
為、着色する際に、配合比が低いマスターバッチを用い
ると顔料の分散ムラが顕著に目立ち、外観上見苦しいも
のとなってしまうというといった問題がある。この為、
添加剤含有量を通常より下げた配合比の高いマスターバ
ッチを用いるか、或いは特殊な樹脂の溶融工程を用いな
ければならず、価格上昇が抑えられない状況がある。
As a countermeasure for this, there is a method in which a polypropylene resin is stretch blow-molded. When this method is used, the low-temperature impact strength can be somewhat improved as compared with a conventional direct blow polypropylene container, but it is inadequate depending on the shape and weight reduction rate of the container. As a method of improving the low-temperature impact strength of a biaxially stretched polypropylene container, there is a method of dry blending a polyethylene resin with a polypropylene resin, but a colorant or an antistatic agent, an ultraviolet absorber, and other additives alone or in a composite. When adding a master batch composed of a polypropylene resin, the number of blending steps for the polypropylene resin increases, which is not practical in terms of uniform dispersibility and cost. Further, since the thickness of the container wall surface is reduced by weight reduction, when coloring, when a master batch having a low mixing ratio is used, the dispersion unevenness of the pigment is remarkably conspicuous, and there is a problem that the appearance becomes unsightly. . Because of this,
It is necessary to use a masterbatch having a higher compounding ratio in which the additive content is lower than usual, or to use a special resin melting step, so that there is a situation where the price increase cannot be suppressed.

【0004】[0004]

【発明が解決しようとする課題】本発明は上記問題点を
鑑みてなされたものであり、低温衝撃強度、顔料等の添
加剤の分散性を改良した樹脂を用いた延伸ポリプロピレ
ン容器を提供することを課題とする。
SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and it is an object of the present invention to provide a drawn polypropylene container using a resin having improved low-temperature impact strength and improved dispersibility of additives such as pigments. As an issue.

【0005】[0005]

【課題を解決するための手段】本発明はかかる課題を解
決するものであり、請求項1に記載の発明は、少なくと
もエチレンと共重合したポリプロピレン樹脂を延伸ブロ
ー成形してなる容器において、ベースとなる樹脂の融点
が前記ポリプロピレン樹脂の融点より低温の樹脂より成
るマスターバッチを添加した樹脂を用いたことを特徴と
する延伸ポリプロピレン容器としたものである。
Means for Solving the Problems The present invention has been made to solve the above-mentioned problems, and an invention according to claim 1 is to provide a container obtained by stretching blow molding at least a polypropylene resin copolymerized with ethylene and a base material. A stretched polypropylene container characterized by using a resin to which a masterbatch made of a resin whose melting point is lower than that of the polypropylene resin is used.

【0006】請求項2に記載の発明は、前記マスターバ
ッチがベースとなる樹脂の融点をポリプロピレン樹脂の
融点より少なくとも10℃低温の樹脂としたことを特徴
とする請求項1に記載の延伸ポリプロピレン容器とした
ものである。
According to a second aspect of the present invention, in the stretched polypropylene container according to the first aspect, the melting point of the resin on which the masterbatch is based is at least 10 ° C. lower than the melting point of the polypropylene resin. It is what it was.

【0007】請求項3に記載の発明は、添加したマスタ
ーバッチのベースとなる樹脂が、ポリエチレン樹脂又は
/及びエチレン成分含有樹脂であることを特徴とする請
求項1または請求項2に記載の延伸ポリプロピレン容器
としたものである。
According to a third aspect of the present invention, the resin as a base of the added masterbatch is a polyethylene resin and / or an ethylene component-containing resin. It is a polypropylene container.

【0008】請求項4に記載の発明は、添加したマスタ
ーバッチのベースとなる樹脂が、プロピレンとエチレン
との共重合樹脂であることを特徴とする請求項1または
請求項2に記載の延伸ポリプロピレン容器としたもので
ある。
According to a fourth aspect of the present invention, there is provided the stretched polypropylene according to the first or second aspect, wherein the resin serving as a base of the added master batch is a copolymer resin of propylene and ethylene. It was a container.

【0009】請求項5に記載の発明は、添加したマスタ
ーバッチのベースとなる樹脂が、エチレン成分含有樹脂
と、プロピレンとエチレンとの共重合樹脂とのブレンド
物であることを特徴とする請求項1または請求項2に記
載の延伸ポリプロピレン容器としたものである。
According to a fifth aspect of the present invention, the resin serving as the base of the added masterbatch is a blend of an ethylene component-containing resin and a copolymer resin of propylene and ethylene. A stretched polypropylene container according to claim 1 or claim 2.

【0010】[0010]

【発明の実施の形態】次に本発明の延伸ポリプロピレン
容器について実施形態に基づいて具体的に説明する。本
発明では、二軸延伸ブロー成形において、ポリプロピレ
ン樹脂に対する着色剤、あるいは帯電防止剤、紫外線吸
収剤、その他の添加剤の単独又は複合物より成るマスタ
ーバッチの分散性の向上及び二軸延伸ポリプロピレン容
器の低温衝撃性を向上するに当たり、マスターバッチの
ベース樹脂として前記ポリプロピレン樹脂の融点より少
なくとも10℃低い融点のエチレン成分を含有した樹脂
を用いた。まず、ポリプロピレン樹脂とマスターバッチ
のブレンド物を溶融混練する課程において、低融点であ
るマスターバッチが先ず溶融し、ポリプロピレン樹脂ペ
レットの間隙に入り込むと同時に、前記ポリプロピレン
樹脂ペレットを包み込む状態となるため、延伸ブロー成
形に用いるポリプロピレン樹脂と同一の樹脂グレードに
て作成したマスターバッチを用いてポリプロピレン樹脂
と溶融混合する一般の方法に比べ飛躍的な分散性の向上
をもたらすことが可能となった。
BEST MODE FOR CARRYING OUT THE INVENTION Next, the stretched polypropylene container of the present invention will be specifically described based on embodiments. In the present invention, in the biaxial stretch blow molding, the dispersibility of a masterbatch composed of a colorant or an antistatic agent, an ultraviolet absorber, and other additives alone or in combination with a polypropylene resin, and a biaxially stretched polypropylene container In improving the low-temperature impact resistance, a resin containing an ethylene component having a melting point at least 10 ° C. lower than the melting point of the polypropylene resin was used as the base resin of the master batch. First, in the process of melt-kneading a blend of a polypropylene resin and a masterbatch, the masterbatch having a low melting point is first melted, enters the gap between the polypropylene resin pellets, and at the same time, wraps the polypropylene resin pellets. Using a masterbatch made of the same resin grade as the polypropylene resin used for blow molding, it is possible to bring about a remarkable improvement in dispersibility as compared with a general method of melting and mixing with a polypropylene resin.

【0011】マスターバッチに使用する樹脂としては、
プロピレンと少なくともエチレンとを共重合して成る二
軸延伸ブロー成形用樹脂と熱融着性があり、さらに融点
が少なくとも10℃低温であるエチレン成分を含有した
樹脂であれば良く、一例をあげるとポリエチレン樹脂、
プロピレンと少なくともエチレンの共重合樹脂、エチレ
ンプロピレンラバー樹脂、エチレン−αオレフィン共重
合体樹脂、エチレン酢酸ビニル共重合体樹脂、酸変性ポ
リオレフィン樹脂等を単独あるいは混合して用いること
が出来る。マスターバッチとしてこれらの樹脂それぞれ
の添加後の濃度としては、1%乃至10%程度が妥当で
あり、実質的な各樹脂の添加量、複数を混合して添加す
る場合の比率は要求品質によりコントロールすることが
出来る。
[0011] The resin used for the masterbatch includes:
A resin having a heat-fusing property with a biaxial stretch blow molding resin obtained by copolymerizing propylene and at least ethylene, and a resin containing an ethylene component having a melting point of at least 10 ° C. as low as the resin may be used. Polyethylene resin,
A copolymer resin of propylene and at least ethylene, an ethylene propylene rubber resin, an ethylene-α olefin copolymer resin, an ethylene vinyl acetate copolymer resin, an acid-modified polyolefin resin, or the like can be used alone or in combination. The appropriate concentration after addition of each of these resins as a master batch is about 1% to 10%, and the substantial amount of each resin added and the ratio when multiple resins are mixed and added are controlled by the required quality. You can do it.

【0012】本発明に用いる二軸延伸ブロー成形用ポリ
プロピレン樹脂としては、プロピレンと少なくともエチ
レンを1%乃至10%共重合したランダム、ブロック等
の分子構造を有するポリプロピレン樹脂であれば良く、
更にブテン或いはその他の成分を添加した共重合体であ
っても良い。
The polypropylene resin for the biaxial stretch blow molding used in the present invention may be any polypropylene resin having a molecular structure such as a random or block copolymer of propylene and at least 1% to 10% of ethylene.
Further, a copolymer to which butene or other components are added may be used.

【0013】本発明における二軸延伸ブロー成形方法と
しては、プリフォームを製造する射出工程と前記プリフ
ォームをブロー成形する工程を同一の成形機内で行うホ
ットパリソン法及びプリフォームを射出成形機で製造し
た後、前記プリフォームを別機にて再加熱しブロー成形
するコールドパリソン法のいずれの方法であっても良
い。
The biaxial stretching blow molding method of the present invention includes a hot parison method in which an injection step of producing a preform and a step of blow molding the preform are performed in the same molding machine, and a preform is produced by an injection molding machine. After that, the preform may be reheated by another machine and blow-molded, and any of the cold parison methods may be used.

【0014】[0014]

【実施例】<実施例1>ホットパリソン式二軸延伸ブロ
ー成形機にてプロピレンランダムコポリマー(メルトフ
ローレート=2.0g/10分、エチレンコンテント=
2.1%、融点=155℃)に、低密度ポリエチレン樹
脂(メルトフローレート=3.0g/10分、融点11
5℃)をベースレジンに用いた着色マスターバッチ(樹
脂=80%、顔料として酸化チタン=20%)を95:
5の割合で添加し、楕円形状で、満水容量が628m
l、重量が16.7gの容器の成形を下記条件にて行っ
た。 射出成形温度=205℃ 射出成形部金型温度=15℃ 延伸ブロー倍率=縦方向2倍、横方向(長手方向2.1
倍)、(長手方向1.5倍) ブローエアー圧力=15kg/cm2
<Example 1> Propylene random copolymer (melt flow rate = 2.0 g / 10 min, ethylene content =
2.1%, melting point = 155 ° C.) and low density polyethylene resin (melt flow rate = 3.0 g / 10 min, melting point 11)
95 ° C.) (5 ° C.) as a base resin (resin = 80%, titanium oxide = 20% as pigment)
5 oval, oval shape, full water capacity 628m
1, a container having a weight of 16.7 g was molded under the following conditions. Injection molding temperature = 205 ° C. Injection molding die temperature = 15 ° C.
Blow air pressure = 15 kg / cm 2

【0015】<比較例1>ホットパリソン式二軸延伸ブ
ロー成形機にてプロピレンランダムコポリマー(メルト
フローレート=2.0g/10分、エチレンコンテント
=2.1%、融点=155℃)に、同一の樹脂をベース
レジンに用いた着色マスターバッチ(樹脂=80%、顔
料として酸化チタン=20%)を95:5の割合で添加
し、楕円形状で、満水容量が628ml、重量が16.
7gの容器の成形を下記条件にて行った。 射出成形温度=205℃ 射出成形部金型温度=15℃ 延伸ブロー倍率=縦方向2倍、横方向(長手方向2.1
倍)、(長手方向1.5倍) ブローエアー圧力=15kg/cm2
Comparative Example 1 Same as propylene random copolymer (melt flow rate = 2.0 g / 10 min, ethylene content = 2.1%, melting point = 155 ° C.) using a hot parison type biaxial stretch blow molding machine. Masterbatch (resin = 80%, titanium oxide = 20% as pigment) in a ratio of 95: 5, using the resin of (1) as a base resin, in an elliptical shape, with a full water capacity of 628 ml and a weight of 16.
A 7 g container was molded under the following conditions. Injection molding temperature = 205 ° C. Injection molding die temperature = 15 ° C.
Blow air pressure = 15 kg / cm 2

【0016】<比較結果>成形した各ボトルの落下衝撃
試験結果、及び外観(顔料の分散)の目視観察結果を表
1に示した。
<Comparative Results> Table 1 shows the results of the drop impact test and the visual observation of the appearance (dispersion of the pigment) of each molded bottle.

【0017】[0017]

【表1】 [Table 1]

【0018】[0018]

【発明の効果】本発明によれば、二軸延伸ブロー成形用
ポリプロピレン樹脂に、ベースレジンとして前記ポリプ
ロピレン樹脂の融点より少なくとも10℃低い融点のエ
チレン成分含有樹脂によって作製したマスターバッチを
添加することにより、二軸延伸ブロー成形後のボトルに
おいて良好な耐衝撃性、着色剤、帯電防止剤、紫外線吸
収剤、その他の添加剤等の良好な分散性を得ることが出
来た。
According to the present invention, a masterbatch made of an ethylene component-containing resin having a melting point at least 10 ° C. lower than the melting point of the polypropylene resin as a base resin is added to the polypropylene resin for biaxial stretch blow molding. In the bottle after the biaxial stretching blow molding, good impact resistance and good dispersibility of a colorant, an antistatic agent, an ultraviolet absorber, and other additives could be obtained.

───────────────────────────────────────────────────── フロントページの続き Fターム(参考) 3E033 BA15 BA16 BB04 BB05 CA03 CA07 CA11 FA03 GA02 4F070 AA13 AA15 AB11 AB23 FA03 FA17 FB03 FC09 4F208 AA04E AA09 AA11E AA12 AC08 AG07 AH55 LA01 LA02 LA04 LB01 LB21 LG28 LN29 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3E033 BA15 BA16 BB04 BB05 CA03 CA07 CA11 FA03 GA02 4F070 AA13 AA15 AB11 AB23 FA03 FA17 FB03 FC09 4F208 AA04E AA09 AA11E AA12 AC08 AG07 AH55 LA01 LA02 LA04 LB01 LB21 L

Claims (5)

【特許請求の範囲】[Claims] 【請求項1】少なくともエチレンと共重合したポリプロ
ピレン樹脂を延伸ブロー成形してなる容器において、ベ
ースとなる樹脂の融点が前記ポリプロピレン樹脂の融点
より低温の樹脂より成るマスターバッチを添加した樹脂
を用いたことを特徴とする延伸ポリプロピレン容器。
1. A container formed by stretch-blow-molding a polypropylene resin copolymerized with at least ethylene, wherein a resin to which a master batch of a resin whose base resin has a melting point lower than that of the polypropylene resin is used. A stretched polypropylene container, characterized in that:
【請求項2】前記マスターバッチがベースとなる樹脂の
融点をポリプロピレン樹脂の融点より少なくとも10℃
低温の樹脂としたことを特徴とする請求項1に記載の延
伸ポリプロピレン容器。
2. The melting point of the resin on which the master batch is based is at least 10 ° C. lower than the melting point of the polypropylene resin.
The stretched polypropylene container according to claim 1, wherein the container is a low-temperature resin.
【請求項3】添加したマスターバッチのベースとなる樹
脂が、ポリエチレン樹脂または/及びエチレン成分含有
樹脂であることを特徴とする請求項1または請求項2に
記載の延伸ポリプロピレン容器。
3. The stretched polypropylene container according to claim 1, wherein the base resin of the added master batch is a polyethylene resin and / or a resin containing an ethylene component.
【請求項4】添加したマスターバッチのベースとなる樹
脂が、プロピレンともエチレンとの共重合樹脂であるこ
とを特徴とする請求項1または請求項2に記載の延伸ポ
リプロピレン容器。
4. The stretched polypropylene container according to claim 1, wherein the resin serving as a base of the added master batch is a copolymer resin of propylene and ethylene.
【請求項5】添加したマスターバッチのベースとなる樹
脂が、エチレン成分含有樹脂と、プロピレンとエチレン
との共重合樹脂とのブレンド物であることを特徴とする
請求項1または請求項2に記載の延伸ポリプロピレン容
器。
5. The resin according to claim 1, wherein the resin serving as a base of the added masterbatch is a blend of an ethylene component-containing resin and a copolymer resin of propylene and ethylene. Stretched polypropylene container.
JP10206399A 1998-07-22 1998-07-22 Oriented polypropyrene container Pending JP2000033925A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP10206399A JP2000033925A (en) 1998-07-22 1998-07-22 Oriented polypropyrene container

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP10206399A JP2000033925A (en) 1998-07-22 1998-07-22 Oriented polypropyrene container

Publications (1)

Publication Number Publication Date
JP2000033925A true JP2000033925A (en) 2000-02-02

Family

ID=16522721

Family Applications (1)

Application Number Title Priority Date Filing Date
JP10206399A Pending JP2000033925A (en) 1998-07-22 1998-07-22 Oriented polypropyrene container

Country Status (1)

Country Link
JP (1) JP2000033925A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001081455A1 (en) * 2000-04-17 2001-11-01 Idemitsu Petrochemical Co., Ltd. Colored pigment master batch and blow molding method using the same
CN1309780C (en) * 2004-05-17 2007-04-11 山东天野塑化有限公司 High molecular antistatic masterbatch
JP2011184094A (en) * 2010-03-11 2011-09-22 Sunallomer Ltd Pearl tone appearance container

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001081455A1 (en) * 2000-04-17 2001-11-01 Idemitsu Petrochemical Co., Ltd. Colored pigment master batch and blow molding method using the same
US6720377B2 (en) 2000-04-17 2004-04-13 Idemitsu Petrochemical Co., Ltd. Color pigment master batch and blow molding method using the same
CN1309780C (en) * 2004-05-17 2007-04-11 山东天野塑化有限公司 High molecular antistatic masterbatch
JP2011184094A (en) * 2010-03-11 2011-09-22 Sunallomer Ltd Pearl tone appearance container

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