JPH09328584A - Thermoforming resin composition and sheet prepared therefrom - Google Patents

Thermoforming resin composition and sheet prepared therefrom

Info

Publication number
JPH09328584A
JPH09328584A JP17420096A JP17420096A JPH09328584A JP H09328584 A JPH09328584 A JP H09328584A JP 17420096 A JP17420096 A JP 17420096A JP 17420096 A JP17420096 A JP 17420096A JP H09328584 A JPH09328584 A JP H09328584A
Authority
JP
Japan
Prior art keywords
polypropylene
resin composition
polyethylene
thermoforming
sheet
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
JP17420096A
Other languages
Japanese (ja)
Other versions
JP3360532B2 (en
Inventor
Sadafumi Furukawa
禎史 古川
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.)
Sumitomo Bakelite Co Ltd
Original Assignee
Sumitomo Bakelite 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 Sumitomo Bakelite Co Ltd filed Critical Sumitomo Bakelite Co Ltd
Priority to JP17420096A priority Critical patent/JP3360532B2/en
Publication of JPH09328584A publication Critical patent/JPH09328584A/en
Application granted granted Critical
Publication of JP3360532B2 publication Critical patent/JP3360532B2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

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Abstract

PROBLEM TO BE SOLVED: To provide a polypropylene-base resin composition for packaging which is excellent in thermoformability and particularly has a wide formable temperature range upon fabrication operation, and a sheet prepared therefrom. SOLUTION: The thermoforming resin composition is a resin composition comprising 80-60wt.% polypropylene and 20-40wt.% polyethylene based on the total amount of the composition, wherein the relative viscosity (ρPE/ρPP) of the melt viscosity (ρPE) of the polyethylene to that (ρPP) of the polypropylene is 0.05-1.8 as measured by a capillary rheometer at 250 deg.C at a shear rate of 121.6sec<-1> in accordance with JIS K 7199.

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】本発明は押出成形など一般の
熱成形原料に適したプロピレン系樹脂組成物及びそのシ
ートに関する。本発明の樹脂組成物は熱成形可能な温度
幅が広く、食品包装、医薬品包装など各種包装容器の材
料として好ましく、特にPTPと称する医薬品(固形剤)
包装用として好ましい。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a propylene resin composition suitable for general thermoforming materials such as extrusion molding and a sheet thereof. The resin composition of the present invention has a wide temperature range that can be thermoformed, and is preferable as a material for various packaging containers such as food packaging and pharmaceutical packaging.
Suitable for packaging.

【0002】[0002]

【従来の技術】固形医薬品の包装用材料として用いられ
ているPTP包装用シートには、従来、ポリ塩化ビニル
(以下、PVCと略記する)が広く用いられている。この
PVCシートは、成形加工性、透明性、耐衝撃性などP
TP包装に必要な特性をほぼ満足する優れたシートであ
るが防湿特性が充分でない。このため、高い防湿性を必
要とする製剤に対してはPTP包装を行なった後、更に
アルミ箔を含むラミネートフィルムなどを用いてピロー
包装を行うか、あるいはPVCシートにポリ塩化ビニリ
デンをコーティングした複合シートを用いることにより
防湿性の向上をはかっている。しかしながら、このよう
な方法では工程数が増え、包材のコスト上昇が大きく好
ましくない。
2. Description of the Related Art PTP packaging sheets used as packaging materials for solid pharmaceuticals have conventionally used polyvinyl chloride.
(Hereinafter, abbreviated as PVC) is widely used. This PVC sheet has P processing properties such as moldability, transparency, and impact resistance.
It is an excellent sheet that almost satisfies the characteristics required for TP packaging, but has insufficient moisture-proof properties. For this reason, for preparations requiring high moisture resistance, PTP packaging is performed, and then pillow packaging is performed using a laminated film containing aluminum foil, or a PVC sheet coated with polyvinylidene chloride is used. By using a sheet, the moisture-proof property is improved. However, such a method is not preferable because the number of steps increases and the cost of the packaging material increases.

【0003】また、近年、PVC処理による環境汚染を
防止すると共に、より高い防湿性を得るためポリプロピ
レンからなるシートが使用されつつある。しかしなが
ら、ポリプロピレンは熱成形性が極めて悪いという工業
上大きな問題がある。すなわち、ポリプロピレンは熱成
形における予熱の際、熱によるドローダウンが大きく、
良好な成形品を得ることのできる最適な成形温度幅が2
〜3℃程度であり非常に狭い。このため、ポリプロピレ
ンの熱成形にあたっては、非常に高度な温度制御が必要
であり、従来の汎用成形機では成形不良率が高く工程管
理は極めて困難である。
[0003] In recent years, a sheet made of polypropylene has been used in order to prevent environmental pollution due to PVC treatment and to obtain higher moisture proofness. However, polypropylene has a serious industrial problem that the thermoformability is extremely poor. In other words, polypropylene has a large drawdown due to heat during preheating in thermoforming,
The optimal molding temperature range for obtaining good molded products is 2
~ 3 ° C and very narrow. For this reason, in thermoforming polypropylene, very high temperature control is required, and the conventional general-purpose molding machine has a high molding defect rate and is extremely difficult to control the process.

【0004】このため、熱成形性の良好なポリプロピレ
ンについての検討はこれまで種々なされており、例え
ば、ポリプロピレンに比較的成形性の良好なポリエチレ
ンやエチレン−プロピレン共重合体、無機フィラーある
いは低分子量の石油樹脂をブレンドして改質することに
ついての提案がある。例えば、溶融時に高粘度のポリプ
ロピレンに、高粘度のポリエチレン(低密度ポリエチレ
ン)及び含水ケイ酸マグネシウム粉末を添加する方法(特
公昭56−15744号公報)、ポリプロピレンに、ポ
リエチレン(高密度ポリエチレン)及びエチレン−プロピ
レン共重合体を添加する方法(特公昭63−29704
号公報)、ポリプロピレンと分子量分布の狭いポリエチ
レンを使用し、成形加工性・耐振動疲労性を改良する方
法(特公昭63−53213号公報)、ポリプロピレンに
石油樹脂及びエチレン−α−オレフィン共重合体を添加
する方法(特公平6−89191号公報)などが知られて
いる。しかしながら、これらは各々特定の温度条件にお
けるシート軟化緊張保持時間、溶融体強度、絞り加工
性、ドローダウン等の成形加工性の改善に対しては効果
が認められるものの成形性改良の実質的な指標である成
形可能温度幅の拡大についてはがほとんど効果がなく、
現実的な成形性の改善について未だ満足できるポリプロ
ピレンは得られていない。また、石油樹脂等の低分子量
化合物を配合した場合、ブリード、溶出が生じ、衛生面
から医薬品包装には使用できない。
[0004] For this reason, various studies have been made on polypropylene having good thermoformability. For example, polyethylene and ethylene-propylene copolymers, inorganic fillers or low molecular weight resins having relatively good moldability have been used for polypropylene. There are proposals for blending and modifying petroleum resins. For example, a method of adding high-viscosity polyethylene (low-density polyethylene) and hydrated magnesium silicate powder to high-viscosity polypropylene at the time of melting (Japanese Patent Publication No. 56-15744), polyethylene (high-density polyethylene) and ethylene A method of adding a propylene copolymer (JP-B-63-29704).
JP-A-63-53213), a method of using polypropylene and polyethylene having a narrow molecular weight distribution to improve moldability and vibration fatigue resistance (JP-B-63-53213), a petroleum resin and an ethylene-α-olefin copolymer (Japanese Patent Publication No. 6-89191) is known. However, these are effective indicators for improving the sheet softening tension retention time, melt strength, drawability, drawdown, and other forming processability under specific temperature conditions, but they are substantial indicators of improving formability. There is almost no effect on the expansion of the moldable temperature range, which is
Satisfactory polypropylene for realistic improvement in moldability has not been obtained yet. When a low molecular weight compound such as a petroleum resin is blended, bleeding and elution occur, so that it cannot be used for pharmaceutical packaging from a hygienic point of view.

【0005】[0005]

【発明の目的及び概要】本発明の目的は熱成形性に優れ
たポリプロピレン系樹脂組成物、特に成形加工時の成形
可能な温度幅が広い包装用ポリプロピレン系樹脂組成物
及びそのシートを提供することにある。本発明者はポリ
プロピレン系樹脂に関して種々検討を行った結果、特定
の溶融粘度比を有するポリプロピレンとポリエチレンと
を所定量配合することにより前記の課題を解決し得ると
の知見を得て本発明を完成するに至った。
OBJECT AND SUMMARY OF THE INVENTION It is an object of the present invention to provide a polypropylene-based resin composition having excellent thermoformability, particularly a polypropylene-based resin composition for packaging which has a wide temperature range in which molding is possible and a sheet thereof. It is in. The present inventor has conducted various studies on polypropylene-based resins, and completed the present invention by finding that the above-mentioned problems can be solved by mixing a predetermined amount of polypropylene and polyethylene having a specific melt viscosity ratio. Came to do.

【0006】すなわち、本発明は組成物全量に対してポ
リプロピレン80〜60重量%及びポリエチレン20〜
40重量%を配合してなる樹脂組成物であって、JIS
K7199に従ってキャピラリーレオメータにより250
℃、剪断速度121.6sec-1において測定した前記ポリ
プロピレンの溶融粘度(ρPP)及びポリエチレンの溶融
粘度(ρPE)の粘度比(ρPE/ρPP)が0.05〜1.
8である熱成形用樹脂組成物を提供するものである。本
発明の樹脂組成物は、ポリプロピレンがメルトフローレ
ート(以下MFRという;JIS K 7210、条件14)1〜
5g/10minのホモポリマーであるのが、またポリエ
チレンがMFR(JIS K 7210、条件4)5〜20
g/10minの高密度ポリエチレンであるのが好まし
い。また、本発明は、このような樹脂組成物を成形して
なるシートを提供するものである。
That is, the present invention relates to 80 to 60% by weight of polypropylene and 20 to 20% of polyethylene based on the total amount of the composition.
A resin composition comprising 40% by weight of JIS
250 by capillary rheometer according to K7199
The viscosity ratio (ρPE / ρPP) of the melt viscosity (ρPP) of the polypropylene and the melt viscosity (ρPE) of the polyethylene measured at a temperature of 12 ° C. and a shear rate of 121.6 sec −1 is 0.05 to 1.
No. 8, which is a thermoforming resin composition. In the resin composition of the present invention, polypropylene has a melt flow rate (hereinafter referred to as MFR; JIS K 7210, condition 14) 1 to
5 g / 10 min is a homopolymer, and polyethylene is MFR (JIS K 7210, condition 4) 5 to 20.
It is preferably high density polyethylene of g / 10 min. The present invention also provides a sheet formed by molding such a resin composition.

【0007】[0007]

【発明の詳細な開示】Detailed Disclosure of the Invention

(ポリプロピレン)本発明の樹脂組成物に用いられるポ
リプロピレンの種類としては、例えばプロピレンのホモ
ポリマー、プロピレンとエチレンやα−オレフィンとの
ブロックコポリマー、ランダムコポリマーなどの公知の
ポリプロピレン及びこれらの混合物が挙げられる。特に
高度の防湿性、透明性、剛性が必要な場合は、プロピレ
ンのホモポリマーが好ましい。また、これらの樹脂は2
種以上を併用してもよい。
(Polypropylene) Examples of the type of polypropylene used in the resin composition of the present invention include known polypropylenes such as propylene homopolymers, block copolymers of propylene and ethylene or α-olefins, and random copolymers, and mixtures thereof. . In particular, when high moisture resistance, transparency and rigidity are required, a homopolymer of propylene is preferred. Also, these resins are
More than one species may be used in combination.

【0008】ポリプロピレンはフィルム、シート等の押
出成形性の良好なものが好ましい。このような樹脂とし
ては、MFR(JIS K 7210、条件14)が0.1
〜10g/10minであるのが好ましく、より好ましく
は1〜10g/10minであり、最も好ましくは1〜5
g/10minである。MFRが前記の値より小さいと、
押出しシートの表面外観が悪くなる傾向があり好ましく
ない。一方、MFRが前記の値より大きいとシート押出
し加工性が不安定となり好ましくない。
As the polypropylene, those having good extrusion moldability, such as films and sheets, are preferable. As such a resin, MFR (JIS K 7210, condition 14) is 0.1.
It is preferably -10 g / 10 min, more preferably 1-10 g / 10 min, and most preferably 1-5.
g / 10 min. When the MFR is smaller than the above value,
The surface appearance of the extruded sheet tends to deteriorate, which is not preferable. On the other hand, if the MFR is larger than the above value, the sheet extrusion processability becomes unstable, which is not preferable.

【0009】ポリプロピレンの配合量は組成物全量に対
して、80〜60重量%、好ましくは75〜60重量
%、より好ましくは70〜61重量%である。ポリプロ
ピレンの配合量が前記の範囲より多いと、フィルムを真
空・圧空成形する場合の二次加工性など、成形性の改良
が充分でない。また、ポリプロピレンの配合量が前記の
範囲より少ないとポリプロピレンの優れた特性である耐
熱性が得られない。
The amount of polypropylene blended is 80 to 60% by weight, preferably 75 to 60% by weight, more preferably 70 to 61% by weight, based on the total amount of the composition. If the blending amount of the polypropylene is larger than the above range, the moldability is not sufficiently improved, such as the secondary workability in the case of vacuum / pressure forming the film. On the other hand, if the amount of the polypropylene is less than the above range, heat resistance, which is an excellent property of polypropylene, cannot be obtained.

【0010】(ポリエチレン)ポリエチレンとしては、
例えば高密度ポリエチレン(HDPE)、中密度ポリエチ
レン(MDPE)、低密度ポリエチレン(LDPE)、直鎖
状低密度ポリエチレン(LLDPE)、超低密度ポリエチ
レン(VLDPE)等をいずれも用いることができる。高
い防湿性が必要な場合は、ポリエチレンとして防湿性に
優れた高密度ポリエチレンを用いるのが好ましい。
(Polyethylene) As polyethylene,
For example, any of high-density polyethylene (HDPE), medium-density polyethylene (MDPE), low-density polyethylene (LDPE), linear low-density polyethylene (LLDPE), and ultra-low-density polyethylene (VLDPE) can be used. When high moisture resistance is required, it is preferable to use high density polyethylene having excellent moisture resistance as polyethylene.

【0011】また、JIS K 7199に従って前記条
件にて測定したポリエチレンの溶融粘度(ρPE)と主成
分であるポリプロピレンの溶融粘度(ρPP)との粘度比
(ρPE/ρPP)は0.05〜1.8であり、好ましくは
0.1〜1.0、より好ましくは0.2〜0.7である。こ
の粘度比が前記の範囲より小さいと樹脂が充分均一に混
合できずフィルムなどの成形が困難となる。一方、前記
の範囲を越えると成形の可能な温度幅が充分に拡大せず
好ましくない。
Further, the viscosity ratio between the melt viscosity (ρPE) of polyethylene and the melt viscosity (ρPP) of the main component polypropylene measured under the above conditions according to JIS K 7199.
(ρPE / ρPP) is 0.05 to 1.8, preferably 0.1 to 1.0, and more preferably 0.2 to 0.7. If the viscosity ratio is smaller than the above range, the resin cannot be mixed sufficiently uniformly, and it becomes difficult to form a film or the like. On the other hand, if it exceeds the above range, the temperature range in which molding can be performed is not sufficiently widened, which is not preferable.

【0012】また、ポリエチレンはMFR(JIS K
7210、条件4)が2〜40g/10minであるのが好
ましく、より好ましくは4〜40g/min、最も好まし
くは5〜20g/minである。ポリエチレンのMFRが
前記の範囲より小さいと押出しシートの表面外観が悪く
なる傾向があり好ましくない。一方、前記の範囲より大
きいとシートの押出し加工性が不安定になり、更に物性
低下を招く。
[0012] Polyethylene is MFR (JIS K).
7210, Condition 4) is preferably 2 to 40 g / 10 min, more preferably 4 to 40 g / min, and most preferably 5 to 20 g / min. If the MFR of the polyethylene is smaller than the above range, the surface appearance of the extruded sheet tends to deteriorate, which is not preferable. On the other hand, if it is larger than the above range, the extrudability of the sheet becomes unstable, and the physical properties are further reduced.

【0013】ポリエチレンの配合量は、前記のポリプロ
ピレンの配合量に対応し、組成物全量に対して20〜4
0重量%、好ましくは25〜40重量%、より好ましく
は30〜39重量%である。
The blending amount of polyethylene corresponds to the blending amount of polypropylene described above, and is 20 to 4 with respect to the total amount of the composition.
It is 0% by weight, preferably 25 to 40% by weight, more preferably 30 to 39% by weight.

【0014】本発明の組成物では、溶融粘度比が特定範
囲にあるポリプロピレンとポリエチレンとを所定量配合
することにより、加熱時のシートの粘弾性挙動を広範囲
の温度にわたり精密に制御することが可能となった。そ
の結果、熱成形時の成形加工性、すなわち成形可能な温
度幅が約6℃以上と飛躍的に拡大した。
In the composition of the present invention, the viscoelastic behavior of the sheet when heated can be precisely controlled over a wide range of temperatures by blending a predetermined amount of polypropylene and polyethylene having a melt viscosity ratio in a specific range. It became. As a result, the moldability at the time of thermoforming, that is, the moldable temperature range was dramatically increased to about 6 ° C. or more.

【0015】本発明の組成物には、さらに必要に応じて
基本的性質を損なわず、衛生上許容される範囲において
添加剤、例えば染顔料、安定剤、可塑剤、帯電防止剤、
紫外線吸収剤、酸化防止剤、滑剤、造核剤、充填剤など
を添加してもよい。
The composition of the present invention may further contain, if necessary, additives such as dyes and pigments, stabilizers, plasticizers, antistatic agents within a range acceptable for hygiene without impairing basic properties.
UV absorbers, antioxidants, lubricants, nucleating agents, fillers, and the like may be added.

【0016】(樹脂組成物の製造)本発明の樹脂組成物
を製造するには、所定量の前記ポリプロピレン及びポリ
エチレンを溶融混練する。かかる溶融混練には通常の溶
融押出装置等が用いられてよいが、均一分散のために
は、高剪断の得られる2軸混練機により樹脂温度200
℃以上で混練を行うのが好ましい。
(Production of Resin Composition) In order to produce the resin composition of the present invention, a predetermined amount of the polypropylene and polyethylene are melt-kneaded. A normal melt extruder or the like may be used for such melt-kneading, but for uniform dispersion, a resin temperature of 200 is obtained by a twin-screw kneader capable of obtaining high shear.
It is preferable to carry out kneading at a temperature of not less than ° C.

【0017】シートの成形には、T−ダイ法等を用いた
公知の成形法が採用されてよい。成形押出しされたシー
トは急冷するのが好ましい。透明性の高いシートを得る
には、60℃以下で急冷するのが好ましく、40℃以下
の急冷がより好ましい。得られたシートは成形性の向
上、並びに低温剛性及び防湿性の向上をはかるため熱処
理を行ってもよい。
A known molding method using a T-die method or the like may be adopted for molding the sheet. The extruded sheet is preferably quenched. In order to obtain a highly transparent sheet, rapid cooling at 60 ° C. or lower is preferable, and rapid cooling at 40 ° C. or lower is more preferable. The obtained sheet may be subjected to a heat treatment in order to improve the formability, the low-temperature rigidity and the moisture-proof property.

【0018】[0018]

【実施例】つぎに本発明を実施例に基づきさらに具体的
に説明する。実施例及び比較例において用いた各成分を
以下に示す。なお、溶融粘度はキャピログラフ1C
[(株)東洋精機製作所]により、250℃,剪断速度1
21.6sec-1で、長さ10mm、直径1mmのキャピラ
リーを使用して測定を行った。MFRの測定はポリプロ
ピレンについてはJIS K 7210、条件14、ポリエチ
レンについてはJISK 7210、条件4で行った。
EXAMPLES Next, the present invention will be described more specifically based on examples. The components used in the examples and comparative examples are shown below. The melt viscosity was measured using Capillograph 1C.
[Toyo Seiki Seisakusho], 250 ° C, shear rate 1
The measurement was performed at 21.6 sec -1 using a capillary having a length of 10 mm and a diameter of 1 mm. MFR was measured according to JIS K 7210, condition 14 for polypropylene, and JIS K 7210, condition 4 for polyethylene.

【0019】(ポリプロピレン) ・PP (溶融粘度=553Pa・s、MFR=2.3) HT−6004[チッソ(株)製] ・PP (溶融粘度=748Pa・s、MFR=1.2) S−131[住友化学工業(株)製] (ポリエチレン) ・HDPE (溶融粘度=192Pa・s、MFR=2
0) F6200V[日本ポリオレフィン(株)製] ・HDPE (溶融粘度=348Pa・s、MFR=8.
0) A6080A[日本ポリオレフィン(株)製] ・HDPE (溶融粘度=513Pa・s、MFR=5.
0) 5050FD[日本ポリオレフィン(株)製] ・HDPE (溶融粘度=1010Pa・s、MFR=
0.8) S6008G[日本ポリオレフィン(株)製]
(Polypropylene) -PP (melt viscosity = 553 Pa-s, MFR = 2.3) HT-6004 [manufactured by Chisso Corporation] -PP (melt viscosity = 748 Pa-s, MFR = 1.2) S- 131 [Sumitomo Chemical Co., Ltd.] (Polyethylene) -HDPE (melt viscosity = 192 Pa · s, MFR = 2)
0) F6200V [manufactured by Nippon Polyolefin Co., Ltd.] HDPE (melt viscosity = 348 Pa · s, MFR = 8.
0) A6080A [manufactured by Nippon Polyolefin Co., Ltd.] HDPE (melt viscosity = 513 Pa · s, MFR = 5.
0) 5050FD [manufactured by Nippon Polyolefin Co., Ltd.]-HDPE (melt viscosity = 1010 Pa-s, MFR =
0.8) S6008G [manufactured by Nippon Polyolefin Co., Ltd.]

【0020】[実施例1〜8及び比較例1〜4]各成分
を充分にドライブレンドした後、2軸混練機を用いて樹
脂温度250℃にて融混練し、熱成形用樹脂組成物を得
た。
[Examples 1 to 8 and Comparative Examples 1 to 4] The components were sufficiently dry blended and then melt-kneaded at a resin temperature of 250 ° C. using a biaxial kneader to obtain a thermoforming resin composition. Obtained.

【0021】試料: 厚さ0.3mmのT−ダイ押出
しシートを使用した。
Sample: A T-die extruded sheet having a thickness of 0.3 mm was used.

【0022】引張試験:ASTM−D638を用いた。Tensile test: ASTM-D638 was used.

【0023】成形性: 圧空方式成形機[FBP−M
2;シーケーディ(株)製]を用いて一定圧力下(5kgf/
cm2)、120〜160℃にて熱板温度を1℃単位で上
昇させ、試料シートを成形品(直径;10mm、高さ;
4.5mm、R;1.5)とした。得られた成形品の全体
の厚みが均一である温度を成形可能温度とし、その温度
幅を求めた。
Moldability: Pneumatic molding machine [FBP-M
2; manufactured by CK Corporation] under a constant pressure (5 kgf /
cm 2 ), the temperature of the hot plate is increased by 1 ° C. at 120 to 160 ° C., and the sample sheet is molded (diameter; 10 mm, height;
4.5 mm, R; 1.5). The temperature at which the entire thickness of the obtained molded article was uniform was defined as the moldable temperature, and the temperature range was determined.

【0024】配合組成及び各測定値の結果を表1〜2に
示す。
Tables 1 and 2 show the results of the blended composition and each measured value.

【表1】 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 実 施 例 ─────────────────────────── 1 2 3 4 5 6 7 8 ──────────────────────────────────── 〔配合(重量部)〕 PP 79 61 70 61 70 61 PP 70 61 HDPE 21 39 HDPE 30 39 30 39 HDPE 30 39 ──────────────────────────────────── ρPE/ρPP 0.35 0.35 0.63 0.63 0.47 0.47 0.93 0.93 ──────────────────────────────────── 〔熱成形性〕 成形可能温度幅(℃) 8 12 10 13 8 11 11 14 ──────────────────────────────────── 〔物性値〕 引張強度(N/mm2) 37 36 38 38 36 36 36 35 引張弾性率(N/mm2) 1800 1750 1800 1860 1210 1450 1810 1740 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━[Table 1] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Actual example ──────── ──────────────────── 1 2 3 4 5 6 7 8 ────────────────────── ────────────── [Compound (parts by weight)] PP 79 61 70 61 70 61 PP 70 61 HDPE 21 39 HDPE 30 39 30 39 HDPE 30 39 ──────── ──────────────────────────── ρPE / ρPP 0.35 0.35 0.63 0.63 0.47 0.47 0.93 0.93 ──────────── ───────────────────────── [Thermoformability] Formable temperature range (℃) 8 12 10 13 8 11 11 14 ───── ─────────────────────────────── [Physical properties] Tensile strength (N / mm 2 ) 37 36 38 38 36 36 36 35 Zhang modulus (N / mm 2) 1800 1750 1800 1860 1210 1450 1810 1740 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ ━━━

【0025】[0025]

【表2】 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ 比 較 例 ────────────────────── 1 2 3 4 ──────────────────────────────── 〔配合(重量部)〕 PP 100 70 85 PP 100 HDPE 15 HDPE 30 ──────────────────────────────── ρPE/ρPP − − 1.83 0.93 ──────────────────────────────── 〔熱成形性〕 成形可能温度幅(℃) 2 3 3 3 ──────────────────────────────── 〔物性値〕 引張強度(N/mm2) 35 35 37 37 引張弾性率(N/mm2) 1700 820 1800 1920 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━[Table 2] ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━ Comparative example ──────────── ─────────── 1 2 3 4 ──────────────────────────────── [Compound ( (Parts by weight)] PP 100 70 85 PP 100 HDPE 15 HDPE 30 ──────────────────────────────── ρPE / ρPP − − 1.83 0.93 ──────────────────────────────── [Thermoformability] Formable temperature range (℃) 2 3 3 3 ──────────────────────────────── Physical properties Tensile strength (N / mm 2 ) 35 35 37 37 Tensile strength Elastic modulus (N / mm 2 ) 1700 820 1800 1920 ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━

【0026】[0026]

【発明の効果】本発明の熱成形用組成物は、ポリプロピ
レン系樹脂が有する物性バランス、外観、防湿性を保持
し、かつ熱成形可能な温度幅が大きく拡大するため、熱
成形性、特に真空成形性、圧空成形性に優れており、食
品包装やPTP包装等の医薬品包装など、各種包装容器
類の材料として好ましい。
EFFECTS OF THE INVENTION The thermoforming composition of the present invention retains the balance of physical properties, appearance and moisture resistance of a polypropylene resin, and greatly expands the temperature range in which thermoforming is possible. It has excellent moldability and air-pressure moldability, and is preferable as a material for various packaging containers such as food packaging and pharmaceutical packaging such as PTP packaging.

Claims (4)

【特許請求の範囲】[Claims] 【請求項1】 組成物全量に対してポリプロピレン80
〜60重量%及びポリエチレン20〜40重量%を配合
してなる樹脂組成物であって、JIS K 7199に従
ってキャピラリーレオメータにより250℃、剪断速度
121.6sec-1において測定した前記ポリプロピレンの
溶融粘度(ρPP)及びポリエチレンの溶融粘度(ρPE)
の粘度比(ρPE/ρPP)が0.05〜1.8である熱成
形用樹脂組成物。
1. A polypropylene 80 based on the total amount of the composition.
Of 60 to 60 wt% and 20 to 40 wt% of polyethylene, the melt viscosity (ρPP) of the polypropylene measured at 250 ° C. and a shear rate of 121.6 sec −1 by a capillary rheometer according to JIS K 7199. ) And the melt viscosity of polyethylene (ρPE)
The resin composition for thermoforming having a viscosity ratio (ρPE / ρPP) of 0.05 to 1.8.
【請求項2】 ポリプロピレンがメルトフローレート
(JIS K 7210、条件14)1〜5g/10minの
ホモポリマーである請求項1の熱成形用樹脂組成物。
2. The polypropylene has a melt flow rate.
(JIS K 7210, condition 14) 1-5 g / 10 min homopolymer, The resin composition for thermoforming according to claim 1.
【請求項3】 ポリエチレンがメルトフローレート(J
IS K 7210、条件4)5〜20g/10minの高密
度ポリエチレンである請求項1又は請求項2の熱成形用
樹脂組成物。
3. Polyethylene has a melt flow rate (J
ISK 7210, condition 4) 5 to 20 g / 10 min of high density polyethylene, wherein the thermoforming resin composition according to claim 1 or 2.
【請求項4】 請求項1の樹脂組成物を成形してなるシ
ート。
4. A sheet formed by molding the resin composition according to claim 1.
JP17420096A 1996-06-12 1996-06-12 Thermoforming resin composition and sheet Expired - Fee Related JP3360532B2 (en)

Priority Applications (1)

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Application Number Priority Date Filing Date Title
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JPH09328584A true JPH09328584A (en) 1997-12-22
JP3360532B2 JP3360532B2 (en) 2002-12-24

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000127237A (en) * 1998-10-23 2000-05-09 Chuo Kagaku Co Ltd Thermoforming sheet, talc container for packaging food and manufacture of its container
WO2008032840A3 (en) * 2006-09-11 2008-10-23 Sumitomo Chemical Co Method for preparing insect-repellent compound-containing resin pellet

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2000127237A (en) * 1998-10-23 2000-05-09 Chuo Kagaku Co Ltd Thermoforming sheet, talc container for packaging food and manufacture of its container
JP4564112B2 (en) * 1998-10-23 2010-10-20 中央化学株式会社 Thermoforming sheet, food packaging talc container, and method for producing the container
WO2008032840A3 (en) * 2006-09-11 2008-10-23 Sumitomo Chemical Co Method for preparing insect-repellent compound-containing resin pellet

Also Published As

Publication number Publication date
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