JPH08192462A - Opaque stretched film - Google Patents

Opaque stretched film

Info

Publication number
JPH08192462A
JPH08192462A JP2354195A JP2354195A JPH08192462A JP H08192462 A JPH08192462 A JP H08192462A JP 2354195 A JP2354195 A JP 2354195A JP 2354195 A JP2354195 A JP 2354195A JP H08192462 A JPH08192462 A JP H08192462A
Authority
JP
Japan
Prior art keywords
film
stretching
mfr
opaque
crystalline propylene
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
JP2354195A
Other languages
Japanese (ja)
Inventor
Hiroyuki Maehara
浩之 前原
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.)
JNC Corp
Original Assignee
Chisso Corp
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 Chisso Corp filed Critical Chisso Corp
Priority to JP2354195A priority Critical patent/JPH08192462A/en
Publication of JPH08192462A publication Critical patent/JPH08192462A/en
Pending legal-status Critical Current

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  • Shaping By String And By Release Of Stress In Plastics And The Like (AREA)
  • Compositions Of Macromolecular Compounds (AREA)
  • Manufacture Of Macromolecular Shaped Articles (AREA)

Abstract

PURPOSE: To obtain an opaque film excellent in air permeability by stretching a crystalline propylene homopolymer characterized by that a melt flow rate is a specific value, a ratio of a wt. average mol.wt. and a number average mol.wt. is a specific value or more and the isotactic pentad rate of a polypropylene crystal part of a boiling n-heptane insoluble component is a specific value or more. CONSTITUTION: A crystalline propylene homopolymer characterized by that a melt flow rate (MFR: 10min molten resin emitting amt. at 230 deg.C when load of 2.16 kg is applied) is 0.03-2.0g/10min, a ratio of a wt. average mol.wt.(Mw) and a number average mol.wt. (Mn) is 6 or more and the isotactic pentad rate of a polypropylene crystal part of a boiling n-heptane insoluble component is 0.96 or more is stretched to produce an opaque stretched film. When the MFR of the propylene homopolymer is 0.03/10min or less, extrusion processability at the time of the formation of a film is bad and, when the MFR is 2.0 or more, uniform stretching is hardly performed and an obtained film is easy to tear and an opaque film becomes hard to obtain.

Description

【発明の詳細な説明】Detailed Description of the Invention

【0001】[0001]

【産業上の利用分野】本発明は通気性に優れ、不透明性
を有したポリプロピレンフィルム及びその製造方法に関
する。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polypropylene film having excellent breathability and opacity, and a method for producing the same.

【0002】[0002]

【従来技術】従来より不透明化、通気性化ポリプロピレ
ンフィルムの製造方法としては、ポリプロピレンに非相
溶性の樹脂を添加したフィルムを延伸する方法(特公昭
53−990号、特開昭64−34726号)、無機充
填剤を添加したフィルムを延伸する方法(特公昭58−
30899)等が知られている。
2. Description of the Related Art Conventionally, as a method for producing an opaque and breathable polypropylene film, a method in which a film obtained by adding an incompatible resin to polypropylene is stretched (Japanese Patent Publication No. 53-990 and Japanese Patent Laid-Open No. 3434726). ), A method of stretching a film to which an inorganic filler is added (Japanese Patent Publication Sho 58-
30899) and the like are known.

【0003】しかしながら、上記方法で得られたフィル
ムは機械的物性、特に引裂強度が弱いという欠点を持
つ。即ち、延伸によりポリプロピレンと非相溶性樹脂ま
たは無機充填剤との界面剥離が大きくなり、引裂強度な
どの機械的物性の低下を生じる。また、不透明性の向上
のために無機充填剤を多量に用いることが必要のため、
押出機のシリンダー、スクリュー等が摩耗しやすいとい
う問題点を有している。
However, the film obtained by the above method has a drawback that mechanical properties, particularly tear strength, are weak. That is, stretching causes a large amount of interfacial peeling between the polypropylene and the incompatible resin or the inorganic filler, resulting in deterioration of mechanical properties such as tear strength. Also, since it is necessary to use a large amount of inorganic filler to improve opacity,
There is a problem that the cylinder, screw, etc. of the extruder are easily worn.

【0004】[0004]

【発明が解決しようとする課題】本発明者は従来の不透
明化、通気性化ポリプロピレンフィルムの有する上述の
欠点を解決したフィルムを得るべく鋭意研究した。その
結果、非相溶性の樹脂や無機充填剤を添加することな
く、特定の分子量分布と特定のアイタクチックペンタッ
ド分率(p)を有する結晶性プロピレン単独重合体を特
定の条件下で成形加工することにより、通気性に優れ、
不透明性を有し、かつ機械的物性、安定生産性に優れた
フィルムが得られることを見い出し本発明を完成した。
以上の記述から明らかなように、本発明の目的は通気性
に優れ、不透明性を有し、かつ機械的物性、安定生産性
に優れたポリプロピレンフィルムおよびその製造方法を
提供することである。
DISCLOSURE OF THE INVENTION The inventors of the present invention have conducted extensive studies to obtain a film which solves the above-mentioned drawbacks of the conventional opaque and breathable polypropylene films. As a result, a crystalline propylene homopolymer having a specific molecular weight distribution and a specific itactic pentad fraction (p) can be molded under specific conditions without adding an incompatible resin or an inorganic filler. By processing, it has excellent breathability,
The present invention has been completed by finding that a film having opacity, excellent mechanical properties and stable productivity can be obtained.
As is clear from the above description, an object of the present invention is to provide a polypropylene film having excellent breathability, opacity, mechanical properties, and stable productivity, and a method for producing the same.

【0005】[0005]

【課題を解決するための手段】本発明は以下の構成を有
する。 (1)メルトフローレート(MFR:230℃に於ける
荷重2.16kgを加えた場合の10分間の溶融樹脂吐出
量)が0.03〜2.0g/10分、重量平均分子量
(Mw)と数平均分子量(Mn)との比が6以上である
結晶性プロピレン単独重合体であり、沸騰n−ヘプタン
不溶分のポリプロピレン結晶部のアイソタクチックペン
タッド分率(P)が0.96以上である結晶性プロピレ
ン重合体よりなる不透明性延伸フィルム。 (2)メルトフローレート(MFR:230℃に於ける
荷重2.16kgを加えた場合の10分間の溶融樹脂吐出
量)が0.03〜2.0g/10分、重量平均分子量
(Mw)と数平均分子量(Mn)との比が6以上である
結晶性プロピレン単独重合体であり、沸騰n−ヘプタン
不溶分のポリプロピレン結晶部のアイソタクチックペン
タッド分率(P)が0.96以上である結晶性プロピレ
ン重合体を、溶融、製膜してフィルムとしたのち、該フ
ィルムを融点以下に於いて延伸倍率1.05〜5倍の一
軸延伸または面積延伸倍率が1.5〜25倍の二軸以上
の延伸をしてなることを特徴とする不透明性延伸フィル
ムの製造方法。
The present invention has the following configuration. (1) Melt flow rate (MFR: discharge amount of molten resin for 10 minutes when a load of 2.16 kg at 230 ° C. is applied) is 0.03 to 2.0 g / 10 minutes and the weight average molecular weight (Mw) is It is a crystalline propylene homopolymer having a ratio to the number average molecular weight (Mn) of 6 or more, and the isotactic pentad fraction (P) of the polypropylene crystal part of the boiling n-heptane insoluble is 0.96 or more. An opaque stretched film made of a crystalline propylene polymer. (2) The melt flow rate (MFR: discharge amount of molten resin for 10 minutes when a load of 2.16 kg at 230 ° C. is applied) is 0.03 to 2.0 g / 10 minutes, and the weight average molecular weight (Mw) is It is a crystalline propylene homopolymer having a ratio to the number average molecular weight (Mn) of 6 or more, and the isotactic pentad fraction (P) of the polypropylene crystal part of the boiling n-heptane insoluble is 0.96 or more. A crystalline propylene polymer is melted and formed into a film, and the film is uniaxially stretched at a melting point of not more than 1.05 to 5 times or an area stretching ratio of not more than 1.5 to 25 times. A method for producing an opaque stretched film, which comprises biaxial or more stretching.

【0006】本発明は、メルトフローレート(MFR:
230℃に於ける荷重2.16kgを加えた場合の10分
間の溶融樹脂吐出量)が0.03〜2.0g/10分、
重量平均分子量(Mw)と数平均分子量(Mn)との比
が6以上で、かつ沸騰n−ヘプタン不溶分のポリプロピ
レン結晶部のアイソタクチックペンタッド分率(P)が
0.96以上である結晶性プロピレン重合体を、溶融、
製膜してフィルムとしたのち、該フィルムを融点以下に
於いて延伸倍率1.05〜5倍の一軸延伸または面積延
伸倍率が1.5〜25倍の二軸以上の延伸をして得られ
る不透明性フィルムである。
The present invention is based on the melt flow rate (MFR:
When a load of 2.16 kg at 230 ° C. is applied, the molten resin discharge amount for 10 minutes is 0.03 to 2.0 g / 10 minutes,
The ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is 6 or more, and the isotactic pentad fraction (P) of the polypropylene crystal part of the boiling n-heptane insoluble is 0.96 or more. Melting the crystalline propylene polymer,
It can be obtained by forming a film into a film, and then uniaxially stretching the film at a draw ratio of 1.05 to 5 times or biaxially or more with an area draw ratio of 1.5 to 25 at a melting point or lower. It is an opaque film.

【0007】本発明に於けるプロピレン重合体は、メル
トフローレート(MFR)が0.03〜2.0g/10
分、沸騰n−ヘプタン不溶分のアイソタクチックペンタ
ッド分率(P)が0.960以上で、重量平均分子量
(Mw)と数平均分子量(Mn)との比が6以上であ
る。かかる重合体の製造方法は特に限定されないが、例
えば有機アルミニウム化合物もしくは有機アルミニウム
化合物(I)とエーテル類との反応生成物(II)を四塩
化チタン(C)と反応させて得られる固体生成物(II
I)に、更にエーテル類と四塩化チタン(C)とを反応
させて得られる固体生成物(IV)をジアルキルアルミニ
ウムモノハライドおよび芳香族カルボン酸エステル
(V)と組合せ、該芳香族カルボン酸エステル(V)と該
固体生成物(IV)のモル比率V/IV=0.2〜10.0
とした触媒の存在下にプロピレンを重合させることによ
り得ることができる。
The propylene polymer according to the present invention has a melt flow rate (MFR) of 0.03 to 2.0 g / 10.
In addition, the isotactic pentad fraction (P) of the boiling n-heptane-insoluble matter is 0.960 or more, and the ratio of the weight average molecular weight (Mw) to the number average molecular weight (Mn) is 6 or more. The method for producing such a polymer is not particularly limited, but for example, a solid product obtained by reacting an organoaluminum compound or a reaction product (II) of an organoaluminum compound (I) with an ether with titanium tetrachloride (C). (II
A solid product (IV) obtained by further reacting I) with ethers and titanium tetrachloride (C) is combined with a dialkylaluminum monohalide and an aromatic carboxylic acid ester (V) to obtain the aromatic carboxylic acid ester. Molar ratio of (V) and the solid product (IV) V / IV = 0.2 to 10.0
It can be obtained by polymerizing propylene in the presence of the above catalyst.

【0008】重量平均分子量(Mw)と数平均分子量
(Mn)はゲル・パーミエーション・クロマトグラフィ
ー法(G.P.C法)で測定され、このMw/Mnの比
(以下、Q値と称す)が該プロピレン重合体の分子量分
布のパラメーターとなる。
The weight average molecular weight (Mw) and the number average molecular weight (Mn) are measured by a gel permeation chromatography method (GPC method), and the ratio of Mw / Mn (hereinafter referred to as Q value). ) Is a parameter of the molecular weight distribution of the propylene polymer.

【0009】アイソタクチックペンタッド分率は、マク
ロモレキュールズ、6巻、6号、11月〜12月、92
5〜926頁(1973年)〔Marcromolecules,Vol.6,
No.6,November-December,925〜926 (1973)〕に発表され
ている方法、すなわち13C−NMRを使用して測定され
るプロピレン系重合体分子鎖中のペンタッド単位でのア
イソタクチック分率である。言換えると該分率は、プロ
ピレンモノマー単位が5個連続してアイソタクチック結
合したプロピレンモノマー単位の分率を意味する。上述
の13C−NMRを使用した測定に於けるスペクトルのピ
ークの帰属決定法は、マクロモレキュールズ、8巻、5
号、9月〜10月、687〜689ページ(1975
年)〔Marcromolecules,Vol.8,No.5,September-Octobe
r,687〜689(1975)〕に基づいた。ちなみに、後述の実績
例に於ける13C−NMRによる測定にはFT−NMRの
270MHzの装置を用い、27,000回の積算測定によ
り、シグナル検出限界をアイソタクチックペンタッド分
率で0.001 にまで向上させて行なった。
The isotactic pentad fraction is as described in Macromolecules, Vol. 6, No. 6, November-December, 92.
5 to 926 (1973) [Marcromolecules, Vol.6,
No. 6, November-December, 925-926 (1973)], that is, isotactic fraction in pentad unit in propylene-based polymer molecular chain measured using 13 C-NMR. Is. In other words, the fraction means the fraction of propylene monomer units in which five propylene monomer units are continuously isotactically bonded. The method for determining the attribution of the peak of the spectrum in the measurement using 13 C-NMR described above is described in Macromolecules, Volume 8, 5
Issue, September-October, pages 687-689 (1975
Year) (Marcromolecules, Vol.8, No.5, September-Octobe
r, 687-689 (1975)]. By the way, for the measurement by 13C-NMR in the later-described actual example, a 270-MHz FT-NMR apparatus was used, and the signal detection limit was improved to 0.001 in terms of isotactic pentad fraction by the integrated measurement of 27,000 times. I did it.

【0010】本発明でいうプロピレン重合体の沸騰n−
ヘプタン不溶分とは、5gのプロピレン重合体を500
mlの沸騰キシレン中に全溶解し、これを5000mlのメ
タノールに投入析出させたものを回収、乾燥後、沸騰n
−ヘプタンで6時間ソックスレー抽出した抽出残を意味
している。
The boiling n- of the propylene polymer referred to in the present invention.
Heptane-insoluble matter means 5 g of propylene polymer is 500
It was completely dissolved in 100 ml of boiling xylene, poured into 5000 ml of methanol, and collected and dried.
-Means Soxhlet extract residue for 6 hours with heptane.

【0011】本発明に用いるプロピレン重合体のメルト
フローレート(MFR)が0.03g/10分以下では
製膜時の押出加工性が悪く、また2.0以上では延伸性
が均一に行なわれにくくなり、得られるフィルムが裂け
やすく、不透明性のものが得にくくなる。本発明に於い
ては、重合体の融点以下の温度で延伸することにより、
特に多数の球晶核の球晶間の剥離現象を発現させ、不透
明性を有し、通気性のあるフィルムが得られる。
When the melt flow rate (MFR) of the propylene polymer used in the present invention is 0.03 g / 10 minutes or less, the extrusion processability during film formation is poor, and when it is 2.0 or more, the stretchability is difficult to be performed uniformly. The resulting film is likely to tear and it is difficult to obtain an opaque film. In the present invention, by stretching at a temperature below the melting point of the polymer,
In particular, a peeling phenomenon between spherulites of a large number of spherulite nuclei is exhibited, and an opaque and breathable film is obtained.

【0012】このため、用いる重合体のアイソタクチッ
クペンタッド分率(P)が0.96未満では結晶化度が
低く、結晶化速度が遅く、球晶核の発生数が少くなるた
め、本発明による製造方法を用いても不透明性および通
気性の良好なフィルムは得にくい。更に、Mw/Mn値
(Q値)が6未満では、球晶核の数が少なく、延伸によ
っても不透明性になりにくく、また引裂強度の低いフィ
ルムとなる。
Therefore, if the isotactic pentad fraction (P) of the polymer used is less than 0.96, the crystallinity is low, the crystallization rate is slow, and the number of spherulite nuclei is small. Even if the production method according to the invention is used, it is difficult to obtain a film having good opacity and air permeability. Furthermore, when the Mw / Mn value (Q value) is less than 6, the number of spherulite nuclei is small, it becomes difficult to be opaque even by stretching, and the film has low tear strength.

【0013】本発明で用いる結晶性プロピレン単独重合
体にプロピレンとエチレン、ブテン−1、ペンテン−
1、4−メチル−ペンテン−1、ヘキセン−1、オクテ
ン−1などのα−オレフィンの1種もしくは2種以上と
の結晶性ランダム共重合体もしくは結晶性ブロック共重
合体、プロピレンと酢酸ビニル、アクリル酸エステルな
どとの共重合体もしくは該共重合体のケン化物、プロピ
レンと不飽和カルボン酸もしくはその無水物との共重合
体、該共重合体と金属イオン化合物との反応生成物な
ど、またはプロピレン系重合体に不飽和カルボン酸もし
くはその誘導体で変性した変性プロピレン系重合体なを
混合した混合物を用いることもでき、また、各種合成ゴ
ム(例えばポリブタジエン、ポリイソプロピレン、塩素
化ポリエチレン、塩素化ポリプロピレン、スチレン−ブ
タジエン系ゴム、スチレン−ブタジエン−スチレンブロ
ック共重合体、スチレン−イソプレン−スチレンブロッ
ク共重合体、スチレン−エチレン−ブチレン−スチレン
ブロック共重合体、スチレン−プロピレン−ブチレン−
スチレンブロック共重合体など)または熱可塑性合成樹
脂(例えばポリエチレン、ポリブテン、ポリブテン、ポ
リ−4−メチルペンテン−1の如きプロピレン系重合体
を除くポリオレフィン、ポリスチレン、スチレン−アク
リルニトリル共重合体、アクリルニトリル−ブタジエン
−スチレン共重合体、ポリアミド、ポリエチレンテレフ
タレート、ポリブチレンテレフタレート、ポリ塩化ビニ
ルなど)などを混合して用いることもできる。
The crystalline propylene homopolymer used in the present invention contains propylene, ethylene, butene-1, and pentene-.
A crystalline random copolymer or crystalline block copolymer with one or more α-olefins such as 1,4-methyl-pentene-1, hexene-1, and octene-1, propylene and vinyl acetate, A copolymer with an acrylic ester or the like, a saponified product of the copolymer, a copolymer of propylene and an unsaturated carboxylic acid or an anhydride thereof, a reaction product of the copolymer and a metal ion compound, or the like, or It is also possible to use a mixture of a propylene-based polymer and a modified propylene-based polymer modified with an unsaturated carboxylic acid or a derivative thereof, and various synthetic rubbers (for example, polybutadiene, polyisopropylene, chlorinated polyethylene, chlorinated polyethylene). Polypropylene, styrene-butadiene rubber, styrene-butadiene-styrene block copolymer, styrene Down - isoprene - styrene block copolymer, styrene - ethylene - butylene - styrene block copolymer, styrene - propylene - butylene -
Styrene block copolymer, etc.) or thermoplastic synthetic resin (for example, polyolefin, excluding propylene-based polymer such as polyethylene, polybutene, polybutene, poly-4-methylpentene-1), polystyrene, styrene-acrylonitrile copolymer, acrylonitrile -Butadiene-styrene copolymer, polyamide, polyethylene terephthalate, polybutylene terephthalate, polyvinyl chloride, etc.) may be mixed and used.

【0014】本発明に用いる結晶性プロピレン単独重合
体には、一般に添加されている各種添加剤、例えばフェ
ノール系、チオエーテル系、リン系などの酸化防止剤、
光安定剤、滑剤、帯電防止剤、造核剤、顔料、重金属不
活性化剤、金属石けんなどの分散剤もしくは中和剤、可
塑剤(例えばエポキシ化大豆油、エポキシ化アマニ油な
どのエポキシ系可塑剤、ポリエステル系可塑剤、鉱物油
など)などを本発明の目的を損なわない範囲で添加する
ことができる。
In the crystalline propylene homopolymer used in the present invention, various additives that are generally added, for example, phenol-based, thioether-based, phosphorus-based antioxidants,
Light stabilizers, lubricants, antistatic agents, nucleating agents, pigments, heavy metal deactivators, dispersants or neutralizers for metal soaps, plasticizers (eg epoxy-based soybean oil, epoxidized linseed oil, etc.) Plasticizers, polyester-based plasticizers, mineral oils, etc.) can be added within a range that does not impair the object of the present invention.

【0015】本発明に於いて前述の本発明に係わる結晶
性プロピレン単独重合体は、通常プロピレン系重合体に
添加される前述の各種添加剤の所定量を通常の混合装
置、例えばヘンシェルミキサー(商品名)、スーパーミ
キサー、リボンブレンダー、バンバリーミキサーなどを
用いて混合し、通常の単軸押出機、2軸押出機、ブラベ
ンダーまたはロールなどで、溶融混練してペレタイズ
(粒状化)して用いられる。
In the present invention, the crystalline propylene homopolymer according to the present invention is a conventional mixing device such as a Henschel mixer (commercial product) in which predetermined amounts of the above-mentioned various additives which are usually added to a propylene polymer are added. Name), super mixer, ribbon blender, Banbury mixer, etc., and then melt kneaded and pelletized by an ordinary single-screw extruder, twin-screw extruder, Brabender or roll. .

【0016】かくして得られた重合体を、通常の押出加
工方法(例えば、円形ダイによるインフレーションフィ
ルム成形法、T型ダイによるTダイ成形法など)により
押出温度が200〜300℃、好ましくは200〜28
0℃で押出しシートまたはフィルムを成形する。押出温
度が300℃を越えると結晶化度が低く、結晶化速度が
遅くなり、球晶核の数が減少して均一な不透明性を有す
るフィルムを得ることは困難になる。
The polymer thus obtained has an extrusion temperature of 200 to 300 ° C., preferably 200 to 300 ° C. by a usual extrusion processing method (for example, an inflation film molding method using a circular die, a T die molding method using a T-shaped die). 28
Mold the extruded sheet or film at 0 ° C. When the extrusion temperature exceeds 300 ° C., the crystallinity is low, the crystallization rate becomes slow, the number of spherulite nuclei decreases, and it becomes difficult to obtain a film having uniform opacity.

【0017】更に、該結晶性プロピレン重合体の融点以
下の温度、好ましくは140℃以下、より好ましくは1
20℃以下に於いて一軸方向もしくは2軸方向以上に延
伸することにより多数の球晶核の球晶間の剥離現象を発
現し、通気性を有し、不透明性のフィルムを得ることが
できる。延伸温度が融点未満140℃以上では、球晶の
破壊、消滅により不透明なフィルムを得ることは困難で
ある。延伸は多段階に分けて行なっても良いい。一軸延
伸の場合には、延伸倍率が1.05倍未満では延伸操作
の安定性が悪化し、かつ均一な不透明性を有するフィル
ムを得ることが出来ず、また延伸倍率が5倍を越えると
得られるフィルムの分子配向が強くなり、延伸方向に裂
けやすくなる。
Further, the temperature is not higher than the melting point of the crystalline propylene polymer, preferably not higher than 140 ° C., more preferably 1
By stretching uniaxially or biaxially or more at 20 ° C. or less, peeling phenomenon between spherulites of a large number of spherulite nuclei is manifested, and breathable and opaque film can be obtained. If the stretching temperature is lower than the melting point and is 140 ° C. or higher, it is difficult to obtain an opaque film due to destruction and disappearance of spherulites. The stretching may be performed in multiple stages. In the case of uniaxial stretching, if the stretching ratio is less than 1.05 times, the stability of the stretching operation is deteriorated and a film having uniform opacity cannot be obtained, and if the stretching ratio exceeds 5 times, the film is obtained. The molecular orientation of the obtained film becomes strong and the film tends to tear in the stretching direction.

【0018】また、二軸延伸に於いては、面積延伸倍率
が5倍未満では延伸されない部分が発生しやすく、25
倍を越えると延伸時に破断が多発する。延伸速度は特に
限定されないが、早過ぎるとフィルム破れが起こるため
1,000〜30,000%/分程度が良い。かくして
得られたフィルムは不透明なフィルムであり、通気性を
有し、機械物性にも優れており、装飾用フィルム、文具
用中敷紙、衛生材料用フィルムおよびシート、各種印刷
用紙、各種ラベルなどに好適に使用できる。
Further, in the biaxial stretching, if the area stretching ratio is less than 5 times, a portion which is not stretched is apt to occur,
If it exceeds twice, breaking often occurs during stretching. The stretching speed is not particularly limited, but if it is too fast, film breakage occurs, so about 1,000 to 30,000% / minute is preferable. The film thus obtained is an opaque film, has breathability, and has excellent mechanical properties, and is used as a decorative film, insole paper for stationery, films and sheets for sanitary materials, various printing papers, various labels, etc. Can be suitably used.

【0019】[0019]

【実施例】以下、実施例、比較例および製造例によって
本発明を具体的に説明するが、本発明によって限定され
るものではない。尚、実施例および比較例で用いた評価
方法は次の方法によった。 (I)メルトフローレート(MFR);ASTM D1
238に準じ測定した。(荷重2.16kg) (II)Mw/Mn(Q値);ゲル・パーミエーション・
クロマトグラフ(Water's 社製GPC150C型)を用
いた。測定温度は135℃で移動相はオルトジクロルベ
ンゼンを用い、カラムはTSKゲルGMH6−HTを用
いて測定した。得られた重量平均分子量(Mw)と数平
均分子量(Mn)から、Mw/Mnを求めてQ値とし、
分子量分布を判定するパラメーターとする。Q値が1に
近いものは分布が狭く、大きいものは分布が広いことを
意味している。 (III)アイソタクチックペンタッド分率(P);Marcr
omolecules,Vol.8,No.5,September-October,687〜689
(1975)に基づいて測定した。13C−NMRを使用し、プ
ロピレン分子鎖中のペンタッド単位でのアイソタクチッ
ク分率である。 (IV)ヘイズ(Haze);ASTM D1003に基
づき測定した。(単位:%)この値が大きい程フィルム
は不透明性を有している。 (V)全光線透過率;JIS K6714に基づいて測
定した。(単位:%)この値が小さい程フィルムは不透
明性を有していることを意味する。 (VI)引張強度;ASTM D882に準じ測定した。
(単位:kgf/cm2 )この値が大きい程、フイルムを引張
り破断する時の力が強く破断し難いことを意味する。 (VII)引裂強度;ASTM D1922に準じ測定し
た。(単位:gf/mil)この値が大きい程フィルムを引裂
く時の力が強く引裂き難いことを意味する。 (VIII)透湿度:JIS Z0208に準じ測定した。
カップ法による40℃、90%pH雰囲気化での水分減少
量。(単位: g/m2 ・24Hr)この値が大きい程通気性があ
ることを意味する。
EXAMPLES The present invention will be specifically described below with reference to Examples, Comparative Examples and Production Examples, but the present invention is not limited thereto. The evaluation methods used in Examples and Comparative Examples were as follows. (I) Melt flow rate (MFR); ASTM D1
It measured according to 238. (Load 2.16 kg) (II) Mw / Mn (Q value); gel permeation
A chromatograph (GPC150C type manufactured by Water's) was used. The measurement temperature was 135 ° C., orthodichlorobenzene was used as the mobile phase, and TSK gel GMH6-HT was used as the column. From the obtained weight average molecular weight (Mw) and number average molecular weight (Mn), Mw / Mn is calculated to be a Q value,
This is a parameter for determining the molecular weight distribution. A Q value close to 1 means that the distribution is narrow, and a large Q value means that the distribution is wide. (III) Isotactic pentad fraction (P); Marcr
omolecules, Vol.8, No.5, September-October, 687〜689
(1975). It is the isotactic fraction in pentad units in the propylene molecular chain using 13 C-NMR. (IV) Haze: Measured based on ASTM D1003. (Unit:%) The larger this value, the more opaque the film. (V) Total light transmittance: Measured based on JIS K6714. (Unit:%) The smaller this value is, the more opaque the film is. (VI) Tensile strength: Measured according to ASTM D882.
(Unit: kgf / cm 2 ) The larger this value, the stronger the force when the film is pulled and broken, and the more difficult it is to break. (VII) Tear strength: Measured according to ASTM D1922. (Unit: gf / mil) The larger this value is, the stronger the force when tearing the film and the more difficult it is to tear. (VIII) Water vapor transmission rate: Measured according to JIS Z0208.
Amount of water loss by cup method at 40 ℃, 90% pH atmosphere. (Unit: g / m2 ・ 24Hr) The larger this value, the more breathable it is.

【0020】実施例1 MFRが0.5g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンタッド分率(P)が0.975、
Q値が7.2である結晶性プロピレン単独重合体に酸化
防止剤としてBHT 0.15重量部、テトラキス[メ
チレン(3,5−ジ−ブチルヒドロキシフェニル)プロ
ピオネート]メタン 0.15重量部、ステアリン酸カ
ルシウム 0.15重量部を配合し、ヘンシェルミキサ
ー(商品名)で混合したのち、押出機で溶融、混練しペ
レット化した。得られたペレットを空冷インフレーショ
ンフィルム加工機(トミー機械(株)製)を用いてフィ
ルムに成形し、該フィルムを50℃のロール上で縦(機
械)方向に1.2倍の延伸をし、続いて100℃、15
%の熱弛緩処理を行い、厚み40μmの一軸延伸フィル
ムを得た。
Example 1 MFR 0.5 g / 10 minutes, boiling n-heptane insoluble fraction isotactic pentad fraction (P) 0.975,
To the crystalline propylene homopolymer having a Q value of 7.2, 0.15 part by weight of BHT as an antioxidant, 0.15 part by weight of tetrakis [methylene (3,5-di-butylhydroxyphenyl) propionate] methane, and steer 0.15 parts by weight of calcium phosphate was mixed and mixed with a Henschel mixer (trade name), and then melted and kneaded with an extruder to form pellets. The obtained pellets were formed into a film using an air-cooled inflation film processing machine (manufactured by Tomy Machinery Co., Ltd.), and the film was stretched 1.2 times in the machine direction on a roll at 50 ° C., Then 100 ℃, 15
% Heat relaxation treatment to obtain a uniaxially stretched film having a thickness of 40 μm.

【0021】実施例2 MFRが2.0g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンタッド分率が0.965、Q値が
6.3である該粉末結晶性プロピレン単独重合体を用い
る以外は実施例1に準拠してフィルムを成形し、該フィ
ルムを50℃のロール上で縦(機械)方向に3.0倍の
延伸をし、続いて100℃、10%の熱弛緩処理を行
い、厚み40μmの一軸延伸フィルムを得た。
Example 2 A powdery crystalline propylene homopolymer having an MFR of 2.0 g / 10 minutes, an isotactic pentad fraction of a boiling n-heptane-insoluble matter of 0.965 and a Q value of 6.3. A film was formed according to Example 1 except that the above was used, and the film was stretched 3.0 times in the machine (machine) direction on a roll at 50 ° C., followed by heat relaxation at 100 ° C. and 10%. Treatment was performed to obtain a uniaxially stretched film having a thickness of 40 μm.

【0022】実施例3 MFRが1.2g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンタッド分率が0.970、Q値が
8.1である結晶性プロピレン単独重合体を用いる以外
は実施例1に準拠してフィルムを成形し、該フィルムを
用いて実施例1に準拠して厚み40μmの一軸延伸フィ
ルムを得た。
Example 3 A crystalline propylene homopolymer having an MFR of 1.2 g / 10 minutes, an isotactic pentad fraction of a boiling n-heptane-insoluble matter of 0.970 and a Q value of 8.1 was used. A film was molded according to Example 1 except for the above, and a uniaxially stretched film having a thickness of 40 μm was obtained according to Example 1 using the film.

【0023】実施例4 MFRが0.5g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンタッド分率が0.975、Q値が
7.2の結晶性プロピレン単独重合体を用いて実施例1
に準拠してペレット化し、該ペレットをTダイ押出加工
機(山口製作所(株)製)を用いてシートに成形した。
得られたシートを二軸延伸加工機(東洋精機(株)製)
を用いて、120℃で面積延伸倍率5倍(縦;2.0
倍、横;2.5倍)の延伸をし、厚み40μmの二軸延
伸フィルムを得た。
Example 4 A crystalline propylene homopolymer having an MFR of 0.5 g / 10 min, an isotactic pentad fraction of boiling n-heptane-insoluble matter of 0.975 and a Q value of 7.2 was used. Example 1
The pellets were formed according to the above, and the pellets were formed into a sheet by using a T-die extruder (manufactured by Yamaguchi Seisakusho Co., Ltd.).
Biaxial stretching machine (Toyo Seiki Co., Ltd.) is used for the obtained sheet.
Area draw ratio of 5 times at 120 ° C. (length: 2.0
Double, horizontal: 2.5 times) to obtain a biaxially stretched film having a thickness of 40 μm.

【0024】実施例5 実施例2に準拠してフィルムを成形し、該フィルムを用
いて、130℃で面積延伸倍率12倍(縦;3.0倍、
横;4.0倍)の延伸条件で延伸し、厚み40μmの二
軸延伸フィルムを得た。
Example 5 A film was formed according to Example 2, and the film was used to form an area stretch ratio of 12 times (length: 3.0 times, at 130 ° C.).
The film was stretched under a stretching condition of (horizontal; 4.0 times) to obtain a biaxially stretched film having a thickness of 40 μm.

【0025】実施例6 MFRが0.5g/10分、沸騰n−ヘプタン不溶分の
アイソタクッチクペンダット分率が0.980、Q値が
11.5である結晶性プロピレン単独重合体を用いる以
外は実施例1に準拠してフィルムを成形し、該フィルム
を用いて実施例1に準拠して一軸延伸フィルムを得た。
Example 6 A crystalline propylene homopolymer having an MFR of 0.5 g / 10 minutes, a boiling n-heptane-insoluble matter having an isotactic Pendat fraction of 0.980 and a Q value of 11.5 is used. A film was formed according to Example 1 except for the above, and a uniaxially stretched film was obtained according to Example 1 using the film.

【0026】実施例7 MFRが0.9g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンダット分率が0.975、Q値が
9.9である結晶性プロピレン単独重合体を用いる以外
は実施例1に準拠してフィルムを成形し、該フィルムを
用いて実施例1に準拠して厚み40μmの一軸延伸フィ
ルムを得た。
Example 7 A crystalline propylene homopolymer having an MFR of 0.9 g / 10 minutes, a boiling n-heptane insoluble fraction having an isotactic pendat fraction of 0.975 and a Q value of 9.9 is used. A film was molded according to Example 1 except for the above, and a uniaxially stretched film having a thickness of 40 μm was obtained according to Example 1 using the film.

【0027】実施例8 実施例7準拠してフィルムを成形し、得られたフィルム
を用いて、130℃で面積延伸倍率3倍(縦1.5倍、
横2.0倍)の延伸条件で延伸し、厚み40μmの二軸
延伸フィルムを得た。
Example 8 A film was formed according to Example 7, and the obtained film was used at 130 ° C. to obtain an area draw ratio of 3 times (length: 1.5 times,
The film was stretched under a stretching condition of 2.0 times in width to obtain a biaxially stretched film having a thickness of 40 μm.

【0028】比較例1 MFRが0.5g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンタッド分率が0.947、Q値が
8.2である該結晶性プロピレン単独重合体を用いた以
外実施例1に準拠してフィルムを成形し、該フィルムを
用いて実施例1に準拠して一軸延伸フィルムを得た。
Comparative Example 1 A crystalline propylene homopolymer having an MFR of 0.5 g / 10 min, an isotactic pentad fraction of boiling n-heptane-insoluble matter of 0.947 and a Q value of 8.2 was prepared. A film was molded according to Example 1 except that it was used, and a uniaxially stretched film was obtained according to Example 1 using the film.

【0029】比較例2 比較例1と同様の粉末結晶性プロピレン単独重合体を用
いて実施例1に準拠してフィルムを成形し、得られたフ
ィルムを用いて実施例4に準拠して厚み40μmの二軸
延伸フィルムを得た。
Comparative Example 2 Using the same powdery crystalline propylene homopolymer as in Comparative Example 1, a film was molded according to Example 1, and the obtained film was used according to Example 4 to have a thickness of 40 μm. A biaxially stretched film of was obtained.

【0030】比較例3 比較例1と同様の結晶性プロピレン単独重合体を用いる
以外は実施例1に準拠してフィルムを成形し、該フィル
ムを用いて延伸倍率を6倍とする以外実施例1に準拠し
て一軸延伸フィルムを得た。
Comparative Example 3 Example 1 was repeated except that the same crystalline propylene homopolymer as in Comparative Example 1 was used, but a film was formed in accordance with Example 1 and the stretching ratio was 6 times. To obtain a uniaxially stretched film.

【0031】比較例4 MFRが1.5g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンタッド分率が0.967、Q値が
4.8である結晶性プロピレン単独重合体を用いる以外
実施例1に準拠してフィルムを成形し、実施例1に準拠
して厚み40μmの一軸延伸フィルムを得た。
Comparative Example 4 A crystalline propylene homopolymer having an MFR of 1.5 g / 10 minutes, an isotactic pentad fraction of a boiling n-heptane-insoluble matter of 0.967 and a Q value of 4.8 was used. Other than that, the film was molded according to Example 1 to obtain a uniaxially stretched film having a thickness of 40 μm according to Example 1.

【0032】比較例5 MFRが0.5g/10分、沸騰n−ヘプタン不溶分の
アイソタクチックペンダット分率が0.965、Q値が
7.2である結晶性プロピレン単独重合体に、無機充填
剤(CaCO3)40重量部を配合した組成物を用いて
実施例1に準拠してフィルムを成形し、該フィルムを用
いて実施例1に準拠して厚み40μmの一軸延伸フィル
ムを得た。
Comparative Example 5 A crystalline propylene homopolymer having an MFR of 0.5 g / 10 minutes, an isotactic pendent fraction of boiling n-heptane-insoluble matter of 0.965 and a Q value of 7.2 was prepared. A film was formed according to Example 1 using a composition containing 40 parts by weight of an inorganic filler (CaCO 3 ), and a uniaxially stretched film having a thickness of 40 μm was obtained according to Example 1 using the film. It was

【0033】比較例6 比較例5で用いたのと同様の組成物を用いて実施例2に
準拠してフィルムを成形し、得られたフィルムを用いて
実施例5に準拠して延伸し、厚み40μmの一軸延伸フ
ィルムを得た。
Comparative Example 6 A film was formed according to Example 2 using the same composition as used in Comparative Example 5, and the obtained film was stretched according to Example 5; A uniaxially stretched film having a thickness of 40 μm was obtained.

【0034】実施例1〜8、比較例1〜6で得られたそ
れぞれのフィルムを前記の試験方法により評価を行なっ
た。その結果をまとめて表1に示す。表1より明らかな
ように、実施各例で得られたフィルムは不透明性かつ機
械的物性に優れている。
The films obtained in Examples 1 to 8 and Comparative Examples 1 to 6 were evaluated by the above test method. The results are summarized in Table 1. As is clear from Table 1, the films obtained in the examples are excellent in opacity and mechanical properties.

【0035】[0035]

【発明の効果】本発明のフィルムは、非相溶性樹脂また
は無機充填剤を配合してなる従来公知のフィルムとは異
なり、剛性に著しく優れたフィルムであるのでフィルム
の薄肉化を計ることができ省資源に寄与し得る。また、
機械的物性に優れ、不透明性を有したフィルムであり、
装飾用フィルム、文具用中敷紙、衛生材料用フィルムお
よびシート、各種印刷用紙、各種ラベルなどに好適に使
用できる。さらに、本発明の製造方法によれば無機充填
剤を使用しなくても不透明性にすぐれるフィルムが得ら
れるので、無機充填剤による支障もなく、生産性に優れ
たフィルム製造方法である。
EFFECTS OF THE INVENTION The film of the present invention is extremely excellent in rigidity, unlike a conventionally known film prepared by blending an incompatible resin or an inorganic filler, so that the film can be thinned. It can contribute to resource saving. Also,
It is a film with excellent mechanical properties and opacity,
It can be suitably used for decorative films, insole paper for stationery, films and sheets for sanitary materials, various printing papers, various labels and the like. Further, according to the production method of the present invention, a film having excellent opacity can be obtained without using an inorganic filler, and therefore, there is no problem due to the inorganic filler, and the film production method is excellent in productivity.

【0036】[0036]

【表1】 [Table 1]

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 FI 技術表示箇所 B29K 105:28 B29L 7:00 ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification code Office reference number FI technical display location B29K 105: 28 B29L 7:00

Claims (2)

【特許請求の範囲】[Claims] 【請求項1】メルトフローレート(MFR:230℃に
於ける荷重2.16kgを加えた場合の10分間の溶融樹
脂吐出量)が0.03〜2.0g/10分、重量平均分
子量(Mw)と数平均分子量(Mn)との比が6以上で
ある結晶性プロピレン単独重合体であり、沸騰n−ヘプ
タン不溶分のポリプロピレン結晶部のアイソタクチック
ペンタッド分率(P)が0.96以上である結晶性プロ
ピレン重合体を延伸してなる不透明性延伸フィルム。
1. A melt flow rate (MFR: discharge amount of molten resin for 10 minutes when a load of 2.16 kg at 230 ° C. is applied) is 0.03 to 2.0 g / 10 minutes, and a weight average molecular weight (Mw). ) To the number average molecular weight (Mn) of 6 or more, the isotactic pentad fraction (P) of the polypropylene n-heptane-insoluble polypropylene crystal part is 0.96. An opaque stretched film obtained by stretching the above crystalline propylene polymer.
【請求項2】メルトフローレート(MFR:230℃に
於ける荷重2.16kgを加えた場合の10分間の溶融樹
脂吐出量)が0.03〜2.0g/10分、重量平均分
子量(Mw)と数平均分子量(Mn)との比が6以上で
ある結晶性プロピレン単独重合体であり、沸騰n−ヘプ
タン不溶分のポリプロピレン結晶部のアイソタクチック
ペンタッド分率(P)が0.96以上である結晶性プロ
ピレン重合体を、溶融、製膜してフィルムとしたのち、
該フィルムを延伸温度10℃以上、140℃以下で延伸
倍率1.05〜5倍の一軸延伸または面積延伸倍率が
1.5〜25倍の二軸以上に延伸してなることを特徴と
する不透明性延伸フィルムの製造方法。
2. A melt flow rate (MFR: discharge amount of molten resin for 10 minutes when a load of 2.16 kg at 230 ° C. is applied) is 0.03 to 2.0 g / 10 minutes, and a weight average molecular weight (Mw). ) To the number average molecular weight (Mn) of 6 or more, the isotactic pentad fraction (P) of the polypropylene n-heptane-insoluble polypropylene crystal part is 0.96. The above crystalline propylene polymer is melted and formed into a film,
An opaque film obtained by uniaxially stretching the film at a stretching temperature of 10 ° C. or higher and 140 ° C. or lower at a stretching ratio of 1.05 to 5 times or biaxially at an area stretching ratio of 1.5 to 25 times. Of a flexible stretched film.
JP2354195A 1995-01-17 1995-01-17 Opaque stretched film Pending JPH08192462A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP2354195A JPH08192462A (en) 1995-01-17 1995-01-17 Opaque stretched film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP2354195A JPH08192462A (en) 1995-01-17 1995-01-17 Opaque stretched film

Publications (1)

Publication Number Publication Date
JPH08192462A true JPH08192462A (en) 1996-07-30

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
JP2354195A Pending JPH08192462A (en) 1995-01-17 1995-01-17 Opaque stretched film

Country Status (1)

Country Link
JP (1) JPH08192462A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2002066233A1 (en) * 2001-02-21 2004-06-17 新日本理化株式会社 Porous polypropylene successively biaxially stretched film and method for producing the same
JP2010069710A (en) * 2008-09-18 2010-04-02 Toppan Cosmo Inc Decorative sheet
US20140087167A1 (en) * 2009-06-19 2014-03-27 Mitsubishi Plastics, Inc. Porous polypropylene film

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPWO2002066233A1 (en) * 2001-02-21 2004-06-17 新日本理化株式会社 Porous polypropylene successively biaxially stretched film and method for producing the same
US7682689B2 (en) 2001-02-21 2010-03-23 New Japan Chemical Co., Ltd. Successively biaxial-oriented porous polypropylene film and process for production thereof
JP2010069710A (en) * 2008-09-18 2010-04-02 Toppan Cosmo Inc Decorative sheet
US20140087167A1 (en) * 2009-06-19 2014-03-27 Mitsubishi Plastics, Inc. Porous polypropylene film

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