JPH0673202A - Biaxially oriented polypropylene film - Google Patents

Biaxially oriented polypropylene film

Info

Publication number
JPH0673202A
JPH0673202A JP22895492A JP22895492A JPH0673202A JP H0673202 A JPH0673202 A JP H0673202A JP 22895492 A JP22895492 A JP 22895492A JP 22895492 A JP22895492 A JP 22895492A JP H0673202 A JPH0673202 A JP H0673202A
Authority
JP
Japan
Prior art keywords
weight
component
film
acid
inorganic
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
JP22895492A
Other languages
Japanese (ja)
Other versions
JP3267688B2 (en
Inventor
Kazutoshi Inoue
上 和 俊 井
Koichi Ito
藤 公 一 伊
Hiroshi Omori
森 浩 大
Hajime Mizuno
野 肇 水
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.)
NIMURA KAGAKU KOGYO KK
Mitsubishi Petrochemical Co Ltd
Original Assignee
NIMURA KAGAKU KOGYO KK
Mitsubishi Petrochemical 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 NIMURA KAGAKU KOGYO KK, Mitsubishi Petrochemical Co Ltd filed Critical NIMURA KAGAKU KOGYO KK
Priority to JP22895492A priority Critical patent/JP3267688B2/en
Publication of JPH0673202A publication Critical patent/JPH0673202A/en
Application granted granted Critical
Publication of JP3267688B2 publication Critical patent/JP3267688B2/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Landscapes

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

Abstract

PURPOSE:To obtain the subject film excellent in transparency, blocking resistance and appearance from a composition comprising a crystalline propylene polymer, a blocking agent and a acid-terminated polypropylene. CONSTITUTION:This biaxially oriented film is made from a composition comprising 100 pts.wt. crystalline polypropylene polymer, 0.01-0.2 pt.wt. inorganic or organic blocking agent of a mean particle diameter of 0.5-3mum and a low- molecular-weight polypropylene at least part of the terminal groups of which are modified with an acid and which has a molecular weight of 800-20000. Particularly, silica is desirable as the inorganic blocking agent. Its shape is desirably spherical because it is excellent in the effect of improving the antiblocking properties. Particularly, a non-fused silicone resin powder is desirable as the organic blocking agent. Its shape is desirably spherical.

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、二軸延伸ポリプロピレ
ンフィルムに関するもので、特に、フィルム成形時に巻
取ロールを汚すことが抑制され、透明性、耐ブロッキン
グ性、外観等において優れた性能を有する二軸延伸ポリ
プロピレンフィルムに関するものである。
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a biaxially stretched polypropylene film, and in particular, it suppresses stains of a winding roll during film formation, and has excellent properties such as transparency, blocking resistance and appearance. The present invention relates to a biaxially oriented polypropylene film.

【0002】[0002]

【従来の技術】近年、二軸延伸ポリプロピレンフィルム
は、食品や繊維製品等の包装(容器を含む)用、その他
用途に広く利用されているが、耐ブロッキング性が著し
く劣り、巻き取ったフィルムが互いに密着したり、袋の
口開き性が悪化したりして包装の作業性を著しく低下さ
せるという欠点を有していた。このような問題点を解消
したポリプロピレンフィルムを得ることを目的として、
従来から多くの検討がなされており、シリカ、タルク等
の無機系の微粒子を添加する方法(特公昭52−161
34号公報)、有機系の微粒子を添加する方法(特公昭
50−36262号公報)などが提案されている。
2. Description of the Related Art In recent years, biaxially stretched polypropylene films have been widely used for packaging (including containers) of foods and textiles, and for other purposes. They have a drawback that they are in close contact with each other and the opening property of the bag is deteriorated, so that the workability of the packaging is significantly reduced. For the purpose of obtaining a polypropylene film that solves such problems,
Many studies have been made in the past, and a method of adding inorganic fine particles such as silica and talc (Japanese Patent Publication No. 52-161).
34), a method of adding organic fine particles (Japanese Patent Publication No. 50-36262), and the like.

【0003】[0003]

【発明が解決しようとする課題】しかしながら、二軸延
伸ポリプロピレンフィルムに耐ブロッキング性を付与す
るためには、ブロッキング防止剤としての上記無機系や
有機系の微粒子の添加量を多くすれば良いが、しかし、
その反面、そのようにブロッキング防止剤の添加量を多
くすることによって、二軸延伸ポリプロピレンフィルム
自体の透明性が悪化して来るといった欠点を有してい
る。一方、ブロッキング防止性能を高めるために、ブロ
ッキング防止剤の平均粒径を増加させた場合には、ブロ
ッキング防止剤の平均粒径を核として周囲にボイドが発
生し、フィルムの外観が損なわれるという欠点を有して
いた。そこで、本発明の目的は、透明性を有し、耐ブロ
ッキング性、かつ外観に優れた二軸延伸ポリプロピレン
フィルムを提供することにある。
However, in order to impart blocking resistance to the biaxially oriented polypropylene film, it is sufficient to increase the addition amount of the above-mentioned inorganic or organic fine particles as an anti-blocking agent. But,
On the other hand, there is a drawback in that the transparency of the biaxially oriented polypropylene film itself is deteriorated by increasing the amount of the antiblocking agent added. On the other hand, when the average particle size of the anti-blocking agent is increased in order to enhance the anti-blocking performance, voids are generated around the average particle size of the anti-blocking agent as a core, and the appearance of the film is impaired. Had. Therefore, an object of the present invention is to provide a biaxially oriented polypropylene film having transparency, blocking resistance, and excellent appearance.

【0004】[0004]

【課題を解決するための手段】[Means for Solving the Problems]

[発明の概要]本発明者らは、上記問題点に鑑みて鋭意
研究を重ねた結果、特定な粒径の無機系及び有機系ブロ
ッキング防止剤を特定な量で使用すること、並びに、酸
で変性した低分子量のポリプロピレンを使用することに
より上記目的を達成することができるとの知見を得て本
発明を完成するに至ったものである。すなわち、本発明
の二軸延伸ポリプロピレンフィルムは、下記成分A、成
分B及び成分Cの組成物からなることを特徴とするもの
である。 成分A:結晶性プロピレン系重合体100重量部 成分B:平均粒径が0.5〜3μmの無機系又は有機系
ブロッキング防止剤0.01〜0.2重量部 成分C:少なくとも一部は末端が酸変性された数平均分
子量800〜20,000の低分子量ポリプロピレン
0.1〜1重量部 [発明の具体的説明]
[Summary of the Invention] The present inventors have conducted intensive studies in view of the above-mentioned problems, and as a result, use of an inorganic type and organic type antiblocking agent having a specific particle size in a specific amount, and addition of an acid. The present invention has been completed based on the finding that the above object can be achieved by using a modified low molecular weight polypropylene. That is, the biaxially oriented polypropylene film of the present invention is characterized by comprising a composition of the following component A, component B and component C. Component A: 100 parts by weight of crystalline propylene polymer Component B: 0.01 to 0.2 parts by weight of an inorganic or organic antiblocking agent having an average particle size of 0.5 to 3 μm Component C: At least a part of the end Acid-modified low-molecular-weight polypropylene having a number-average molecular weight of 800 to 20,000 0.1 to 1 part by weight [Detailed description of the invention]

【0005】[I] 二軸延伸ポリプロピレンフィルム用
組成物 (1) 構成成分 (a) 結晶性プロピレン系重合体(成分A) 本発明の二軸延伸ポリプロピレンフィルムにおいて用い
られる結晶性プロピレン系重合体としては、プロピレン
単独重合体、主成分のプロピレンと従成分のエチレン、
ブテン、ヘキセン、4−メチルペンテン、オクテン等の
他のα−オレフィンとからなる共重合体を挙げることが
できる。プロピレン単独重合体が最も好ましいが、共重
合体の中ではプロピレンと40重量%以下の他のα−オ
レフィンとの共重合体が好ましく、更には30重量%以
下、特に20重量%以下のエチレン又はブテンとの共重
合体が好ましい。該共重合体はランダム共重合体でもブ
ロック共重合体でも良い。これら結晶性プロピレン系重
合体は単独でも、或いは、複数の混合物として使用する
こともできる。上記結晶性プロピレン系重合体として
は、好ましくはIIが40以上、中でも60以上、特に
80以上のものが良い。プロピレン単独重合体の場合は
IIが90以上、特に95以上のものがフィルムの腰の
強さの点で好適である。また、MFRは0.5〜10g
/10分、特に1〜5g/10分のものがフィルム特性
の点で好ましい。
[I] Composition for Biaxially Stretched Polypropylene Film (1) Constituent Component (a) Crystalline Propylene Polymer (Component A) As a crystalline propylene polymer used in the biaxially stretched polypropylene film of the present invention Is a propylene homopolymer, the main component of propylene and the minor component of ethylene,
Examples thereof include copolymers composed of other α-olefins such as butene, hexene, 4-methylpentene, and octene. Propylene homopolymer is the most preferable, but among the copolymers, a copolymer of propylene and 40% by weight or less of other α-olefins is preferable, and further 30% by weight or less, particularly 20% by weight or less of ethylene or Copolymers with butene are preferred. The copolymer may be a random copolymer or a block copolymer. These crystalline propylene-based polymers can be used alone or as a mixture of two or more. The crystalline propylene-based polymer preferably has II of 40 or more, particularly 60 or more, and particularly 80 or more. In the case of a propylene homopolymer, a polymer having II of 90 or more, particularly 95 or more is suitable in terms of the firmness of the film. Moreover, MFR is 0.5 to 10 g.
/ 10 minutes, especially 1 to 5 g / 10 minutes is preferable in terms of film characteristics.

【0006】(b) 無機系及び有機系ブロッキング防止剤
(成分B) 上記結晶性プロピレン系重合体に配合されるブロッキン
グ防止剤としては、平均粒径が0.5〜3μm、好まし
くは0.8〜2.5μmの無機系又は有機系のものであ
る。無機系ブロッキング防止剤 上記無機系ブロッキング防止剤としては、例えば、シリ
カ、ゼオライト、タルク、カオリン等を挙げることがで
きる。これらの中ではシリカが好ましい。また、形状と
しては、球状のものが耐ブロッキング性改良効果に優れ
ているので好ましい。有機系ブロッキング防止剤 上記有機系ブロッキング防止剤としては、例えば、非溶
融型のシリコーン樹脂粉末、ポリアミドの粉末、トリア
ジン環を有する縮合型樹脂粉末等を挙げることができる
が、中でも非溶融型のシリコーン樹脂粉末が好ましい。
また、形状も、上記無機系ブロッキング防止剤と同様に
球状をしたものが好ましい。平均粒径が上記範囲未満の
無機系又は有機系ブロッキング防止剤では、耐ブロッキ
ング性の改良をすることができない。また、平均粒径が
上記範囲を超える無機系又は有機系ブロッキング防止剤
では後述する成分Cを添加しても、透明性や外観(ボイ
ド)を改良することができない。
(B) Inorganic and organic antiblocking agents (Component B) The antiblocking agents to be added to the above crystalline propylene polymer have an average particle size of 0.5 to 3 μm, preferably 0.8. It is an inorganic or organic type having a thickness of up to 2.5 μm. Inorganic Antiblocking Agent Examples of the inorganic antiblocking agents include silica, zeolite, talc, kaolin and the like. Of these, silica is preferred. In addition, as the shape, a spherical shape is preferable because it has an excellent effect of improving blocking resistance. Organic Antiblocking Agent Examples of the organic antiblocking agent include non-melting type silicone resin powder, polyamide powder, and condensation type resin powder having a triazine ring. Among them, non-melting type silicone is preferable. Resin powder is preferred.
Also, the shape is preferably spherical like the inorganic antiblocking agent. An inorganic or organic antiblocking agent having an average particle size of less than the above range cannot improve the blocking resistance. Further, in an inorganic or organic antiblocking agent having an average particle size exceeding the above range, even if the component C described later is added, the transparency and the appearance (void) cannot be improved.

【0007】(c) 少なくとも一部は末端が酸変性された
低分子量ポリプロピレン(成分C) 上記結晶性プロピレン系重合体に配合される低分子量ポ
リプロピレンとしては、少なくとも一部は末端が酸変性
された数平均分子量800〜20,000、好ましくは
1,000〜18,000の低分子量ポリプロピレン
(以下単に「酸変性低分子量PP」と略記する場合があ
る。)である。酸変性低分子量PPは、末端二重結合を
有する低分子量ポリプロピレンに、後述する不飽和カル
ボン酸及び/又はその無水物を化学的に付加させること
で合成することができるものであり、その軟化点が13
0〜170℃、好ましくは140〜160℃であり、酸
価が3〜80mgKOH/g、好ましくは10〜60m
gKOH/gであり、160℃での溶融粘度が3,00
0〜20,000cps、好ましくは5,000〜1
8,000cpsを示すものである。ここで好ましい末
端二重結合を有する低分子量ポリプロピレンとしては、
1,000炭素当たり1〜10、好ましくは2〜7の末
端二重結合を有し、数平均分子量で800〜20,00
0、好ましくは1,000〜18,000のものであ
る。末端二重結合が上記範囲未満のものでは、所望の酸
変性を行なうことができない。また、末端二重結合が上
記範囲を超えると、酸変性低分子量PPの耐熱性が低下
するので好ましくない。また、数平均分子量が上記範囲
未満では二軸延伸ポリプロピレンフィルムのフィルム外
観の改良をすることができない。数平均分子量が上記範
囲を超えると酸変性を行なうことはできない。
(C) At least a part of the low-molecular-weight polypropylene whose end is modified with acid (Component C) As the low-molecular-weight polypropylene blended with the above-mentioned crystalline propylene-based polymer, at least a part of it is acid-modified at the end. It is a low molecular weight polypropylene having a number average molecular weight of 800 to 20,000, preferably 1,000 to 18,000 (hereinafter sometimes simply referred to as "acid-modified low molecular weight PP"). The acid-modified low molecular weight PP can be synthesized by chemically adding an unsaturated carboxylic acid and / or its anhydride described below to low molecular weight polypropylene having a terminal double bond, and has a softening point. Is 13
0 to 170 ° C, preferably 140 to 160 ° C, and an acid value of 3 to 80 mgKOH / g, preferably 10 to 60 m.
gKOH / g, melt viscosity at 160 ° C. is 3,000
0 to 20,000 cps, preferably 5,000 to 1
This shows 8,000 cps. As the low molecular weight polypropylene having a terminal double bond preferable here,
It has 1 to 10, preferably 2 to 7, terminal double bonds per 1,000 carbons, and has a number average molecular weight of 800 to 20,000.
0, preferably 1,000 to 18,000. If the terminal double bond is less than the above range, desired acid modification cannot be performed. Further, if the terminal double bond exceeds the above range, the heat resistance of the acid-modified low molecular weight PP decreases, which is not preferable. If the number average molecular weight is less than the above range, the film appearance of the biaxially oriented polypropylene film cannot be improved. If the number average molecular weight exceeds the above range, acid modification cannot be performed.

【0008】このような酸変性は、溶融グラフト法や溶
液グラフト法等で行なうが、溶融グラフト法では通常1
00〜270℃、好ましくは130〜240℃の温度、
反応時間は通常0.5〜30時間、好ましくは1〜20
時間の条件下に実施される。該酸変性によって得られた
ものは、不飽和カルボン酸及び/又はその無水物が、好
ましくは0.1〜12%、特に好ましくは1〜10重量
%の割合で含有されていることが望ましい。このような
ものである限り、直接酸変性されたものを未変性のもの
で希釈したものであっても良い。このような酸変性低分
子量PPは、市販のものから適宜選択して用いることが
できる。不飽和カルボン酸 上記不飽和カルボン酸としては、(メタ)アクリル酸、
マレイン酸、フマル酸及びイタコン酸等を挙げることが
できる。不飽和カルボン酸無水物 上記不飽和カルボン酸無水物としては、無水マレイン
酸、無水イタコン酸及び無水シトラコン酸、無水アリル
コハク酸及び無水ナジック酸等を挙げることができる。
これらの中でも無水マレイン酸を用いることが好まし
い。
Such acid modification is carried out by a melt grafting method or a solution grafting method.
A temperature of 00-270 ° C, preferably 130-240 ° C,
The reaction time is usually 0.5 to 30 hours, preferably 1 to 20
It is carried out under the condition of time. The product obtained by the acid modification preferably contains unsaturated carboxylic acid and / or its anhydride in a proportion of preferably 0.1 to 12%, particularly preferably 1 to 10% by weight. As long as it is such a thing, what was directly acid-modified and diluted with the unmodified thing may be sufficient. Such acid-modified low molecular weight PP can be appropriately selected and used from commercially available products. Unsaturated carboxylic acid Examples of the unsaturated carboxylic acid include (meth) acrylic acid,
Maleic acid, fumaric acid, itaconic acid and the like can be mentioned. Unsaturated Carboxylic Anhydride Examples of the unsaturated carboxylic acid anhydride include maleic anhydride, itaconic anhydride, citraconic anhydride, allyl succinic anhydride, and nadic acid anhydride.
Of these, maleic anhydride is preferably used.

【0009】(2) 量 比無機系又は有機系ブロッキング防止剤 上記結晶性プロピレン系重合体に成分Bのブロッキング
防止剤として配合される無機系又は有機系ブロッキング
防止剤の配合量は、結晶性プロピレン系重合体100重
量部に対して、0.01〜0.2重量部、好ましくは
0.02〜0.18重量部である。この配合量が上記範
囲未満であると耐ブロッキング改良の効果は得られ難
い。また、配合量が上記範囲を超えると前記成分Cを配
合しても透明性や外観(ボイド)を改良することができ
ない。酸変性低分子量PP 上記結晶性プロピレン系重合体に成分Cとして配合され
る酸変性低分子量PPの配合量は、結晶性プロピレン系
重合体100重量部に対して、0.1〜1重量部、好ま
しくは0.2〜0.8重量部である。この配合量が上記
範囲未満では外観(ボイド)を改良することができな
い。また、配合量が上記範囲を超えると透明性が悪化す
る。本発明ではこれらの成分以外に、通常ポリオレフィ
ン樹脂用として使用される酸化防止剤、安定剤、加工助
剤、帯電防止剤、滑剤等の添加剤やオレフィン系ゴム等
の各種配合材を効果の損なわれない量的範囲内で添加す
ることができる。
(2) Amount Inorganic or organic antiblocking agent The amount of the inorganic or organic antiblocking agent to be added to the above crystalline propylene polymer as the antiblocking agent of component B is crystalline propylene. It is 0.01 to 0.2 part by weight, preferably 0.02 to 0.18 part by weight, relative to 100 parts by weight of the polymer. If the amount is less than the above range, it is difficult to obtain the effect of improving blocking resistance. Further, if the blending amount exceeds the above range, the transparency and the appearance (void) cannot be improved even if the component C is blended. Acid-modified low-molecular weight PP The amount of the acid-modified low-molecular-weight PP blended as the component C in the crystalline propylene-based polymer is 0.1 to 1 part by weight with respect to 100 parts by weight of the crystalline propylene-based polymer. It is preferably 0.2 to 0.8 parts by weight. If the content is less than the above range, the appearance (void) cannot be improved. Further, if the blending amount exceeds the above range, the transparency is deteriorated. In the present invention, in addition to these components, antioxidants, stabilizers, processing aids, antistatic agents, additives such as lubricants, and various compounding materials such as olefin-based rubber that are usually used for polyolefin resins impair the effect. Can be added within a quantitative range.

【0010】(3) ポリプロピレン樹脂組成物の製造 上記各成分を混合して組成物を得るための方法として
は、公知の粉体混合機、例えば、ヘンシェルミキサー、
リボンブレンダー等を用いて混合し、押出機等で混練し
てペレット化するのが好適である。この際、成分B、成
分Cを所定量より多量に配合してマスターバッチを調製
し、これを成形時に希釈して使用しても差支えがない。
但し、成分B及び成分Cを別々に配合し、成形時に希釈
して使用するのは効果が低下するので避けることが好ま
しい。
(3) Production of polypropylene resin composition As a method for mixing the above components to obtain a composition, a known powder mixer, for example, Henschel mixer,
It is preferable to mix using a ribbon blender or the like and knead with an extruder or the like to pelletize. At this time, there is no problem even if a master batch is prepared by blending the components B and C in a larger amount than a predetermined amount, and the master batch is diluted and used at the time of molding.
However, it is preferable to avoid blending the component B and the component C separately and diluting and using them at the time of molding since the effect is lowered.

【0011】[II] 二軸延伸ポリプロピレンフィルムの
製造 (1) 二軸延伸 本発明の二軸延伸ポリプロピレンフィルムは、上記ポリ
プロピレン樹脂組成物を常法により、例えばテンターを
用いる同時又は逐次二軸延伸法、インフレーション法に
よって加工することにより二軸延伸ポリプロピレンフィ
ルムを製造することができる。これらの中でも以下に示
すロールの周速差の利用による縦延伸とテンターにより
横延伸が行なわれる逐次二軸延伸法を採用することが好
ましい。 (a) 縦延伸 該二軸延伸のうち先ず縦延伸は、ロールの周速差を利用
して行なわれる。具体的には通常90〜140℃、好ま
しくは105〜135℃の温度で、回転数の異なる二本
のロール間を通過させて、ロールの回転方向(縦方向)
に3〜8倍、好ましくは4〜6倍に延伸する。
[II] Production of Biaxially Stretched Polypropylene Film (1) Biaxially Stretched The biaxially stretched polypropylene film of the present invention can be obtained by subjecting the above polypropylene resin composition to a conventional method, for example, a simultaneous or sequential biaxial stretching method using a tenter. A biaxially stretched polypropylene film can be produced by processing by the inflation method. Among these, it is preferable to employ the sequential biaxial stretching method in which the longitudinal stretching by utilizing the peripheral speed difference of rolls and the transverse stretching by a tenter are performed as described below. (a) Longitudinal Stretching Among the biaxial stretching, first, the longitudinal stretching is performed by utilizing the peripheral speed difference of the rolls. Specifically, it is normally 90 to 140 ° C., preferably 105 to 135 ° C., and is passed between two rolls having different rotation speeds to rotate the roll in the longitudinal direction.
3 to 8 times, preferably 4 to 6 times.

【0012】(b) 横延伸 次いで、この縦方向延伸フィルムを引き続き横方向にテ
ンターオーブン中で3〜12倍、好ましくは6〜11倍
に延伸する。 (c) 熱セット 引き続き、この二軸延伸フィルムを通常120〜170
℃の温度で熱セットすることが望ましい。
(B) Transverse Stretching Next, the longitudinally stretched film is continuously stretched in the transverse direction in a tenter oven 3 to 12 times, preferably 6 to 11 times. (c) Heat setting Subsequently, the biaxially stretched film is usually heated at 120 to 170.
It is desirable to heat set at a temperature of ° C.

【0013】(2) その他の処理 更に、印刷適性、帯電防止剤のブリードを促進させる目
的で、コロナ放電処理を施すこともできる。
(2) Other Treatments Further, corona discharge treatment may be performed for the purpose of promoting printability and bleeding of the antistatic agent.

【0014】[III] 二軸延伸ポリプロピレンフィルム (1) 肉 厚 このようにして得られた二軸延伸フィルムの厚さはその
用途に応じて決められるが、通常5〜100μm、好ま
しくは10〜50μmの範囲である。
[III] Biaxially Stretched Polypropylene Film (1) Thickness The thickness of the biaxially stretched film thus obtained is determined according to its application, but is usually 5 to 100 μm, preferably 10 to 50 μm. Is the range.

【0015】[0015]

【実施例】【Example】

[I] 評価方法 (1) ブロッキング防止剤の脱落性 フィルムを20,000m長さに成形した時の巻取ロー
ルに付着するブロッキング防止剤粉の発生量を目視にて
評価した。 ○:粉の発生が殆ど無い。 △:粉の発生が認められる。 ×:粉の発生が非常に多い。 (2) ヘイズ ASTM−D−1003に準拠して、フィルムを4枚重
ねて測定した。 (3) ブロッキング性 フィルムのブロッキング性は、2枚のフィルムの接触面
積が10cm2 となるように重ねて、2枚のガラス板の
間に置き、50g/cm2 の荷重をかけて40℃の雰囲
気中で7日間放置した後、ショッパー型試験機を用いて
引張速度500mm/分にて引き剥がして、その最大荷
重を読み取って評価した。 (4) フィルムの外観 位相差顕微鏡でフィルム内部のボイドの発生状態を倍率
100倍で観察し、発生の度合いを目視にて以下の基準
で評価した。 ◎:ボイドの発生が全く無い。 ○:ボイドが僅かに発生している。 △:ボイドの発生が多い。 ×:ボイドの発生がかなり多い。 (5) フィルムの傷つき性 1cm2 当たり50gの荷重をかけてフィルム同士を5
回擦り合わせた後、ASTM−D−1003に準拠しフ
ィルム4枚のヘイズを測定した時のヘイズ値の変化量を
求めた。
[I] Evaluation method (1) Detachability of antiblocking agent The amount of antiblocking agent powder adhering to the winding roll when the film was molded to a length of 20,000 m was visually evaluated. ○: Almost no powder is generated. Δ: Generation of powder is recognized. X: Generation of powder is very large. (2) Haze Based on ASTM-D-1003, four films were stacked and measured. (3) Blocking property As for the blocking property of the film, the two films are stacked so that the contact area of the two films is 10 cm 2 , placed between two glass plates, and a load of 50 g / cm 2 is applied to the film in an atmosphere of 40 ° C. After standing for 7 days, the sheet was peeled off at a pulling speed of 500 mm / min using a Shopper type tester, and the maximum load was read and evaluated. (4) Appearance of Film The state of void formation inside the film was observed with a phase contrast microscope at a magnification of 100 times, and the degree of occurrence was visually evaluated according to the following criteria. A: No void is generated. ◯: Voids are slightly generated. Δ: Many voids are generated. X: Voids are considerably generated. (5) Scratchability of films Apply a load of 50 g per 1 cm 2 to make the films 5
After rubbing, the amount of change in haze value was measured when the haze of four films was measured according to ASTM-D-1003.

【0016】[II] 実験例 実施例1〜3及び比較例1〜2 MFRが2.3の結晶性ポリプロピレン単独重合体粉末
100重量部に対して、酸化防止剤としてBHT0.1
2重量部及びテトラキス[メチレン−3−(2´,5´
−ジ−t−ブチル−4´−ヒドロキシフェニル)プロピ
オネート]メタン0.12重量部及び表1に示す添加剤
をそれぞれ配合し、ヘンシェルミキサーで約2分間室温
で高速混合した後、押出機を用いて230℃の温度で溶
融・混練・押出してペレット状組成物を得た。この得ら
れたペレット状組成物を、樹脂温度260℃にて溶融・
押出し、20℃の温度の冷却ロールで急冷してシート状
フィルムにし、縦方向5倍、横方向10倍に逐次延伸し
て最終的に厚さ30μmの延伸フィルムを得た。得られ
た二軸延伸フィルムについて、ヘイズ、ブロッキング
性、フィルムの外観を評価した。
[II] Experimental Examples Examples 1 to 3 and Comparative Examples 1 to 2 100 parts by weight of a crystalline polypropylene homopolymer powder having an MFR of 2.3 was used as an antioxidant with BHT 0.1.
2 parts by weight and tetrakis [methylene-3- (2 ', 5'
0.12 parts by weight of -di-t-butyl-4'-hydroxyphenyl) propionate] methane and the additives shown in Table 1 were respectively mixed, and the mixture was mixed at high speed with a Henschel mixer for about 2 minutes at room temperature, and then an extruder was used. Melted, kneaded and extruded at a temperature of 230 ° C. to obtain a pelletized composition. The obtained pelletized composition was melted at a resin temperature of 260 ° C.
The film was extruded and rapidly cooled with a cooling roll at a temperature of 20 ° C. to obtain a sheet-like film, which was sequentially stretched 5 times in the longitudinal direction and 10 times in the lateral direction to finally obtain a stretched film having a thickness of 30 μm. The obtained biaxially stretched film was evaluated for haze, blocking property and film appearance.

【0017】[0017]

【表1】 [Table 1]

【0018】[0018]

【発明の効果】このような本発明の二軸延伸ポリプロピ
レンフィルムは、フィルム成形時に巻取ロールを汚すこ
とが抑制され、透明性が良好で、しかも、ブロッキング
性及び外観に優れているので、巻き取ったフィルムが互
いに密着せず、袋では口開き性が良好なので、包装時の
作業性が良く、包装用フィルム等として工業的に極めて
有用性のあるフィルムである。その上、フィルム同士が
擦り合った時にブロッキング防止剤によるフィルム表面
の傷つきが生じ難くなり透明性の悪化を防止することが
できると言った効果も奏される。
EFFECTS OF THE INVENTION The biaxially oriented polypropylene film of the present invention can prevent winding stains from being contaminated during film formation, has good transparency, and is excellent in blocking property and appearance. Since the taken films do not adhere to each other and the bag has a good mouth opening property, the workability at the time of packaging is good, and the film is industrially extremely useful as a packaging film or the like. In addition, when the films are rubbed against each other, the anti-blocking agent is less likely to cause scratches on the surface of the film, and it is possible to prevent deterioration of transparency.

───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.5 識別記号 庁内整理番号 FI 技術表示箇所 B29L 7:00 4F (72)発明者 大 森 浩 三重県四日市市東邦町1番地 三菱油化株 式会社四日市総合研究所内 (72)発明者 水 野 肇 三重県四日市市東邦町1番地 三菱油化株 式会社四日市総合研究所内─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 5 Identification number Reference number within the agency FI Technical display location B29L 7:00 4F (72) Inventor Hiroshi Omori 1 Toho-cho, Yokkaichi-shi, Mie Mitsubishi Petrochemical Co., Ltd. Formula company Yokkaichi Research Institute (72) Inventor Hajime Hajime 1 Toho-cho, Yokkaichi-shi, Mie Mitsubishi Petrochemical Co., Ltd. Expression company Yokkaichi Research Institute

Claims (1)

【特許請求の範囲】[Claims] 【請求項1】下記成分A、成分B及び成分Cの組成物か
らなることを特徴とする二軸延伸ポリプロピレンフィル
ム。 成分A:結晶性プロピレン系重合体100重量部 成分B:平均粒径が0.5〜3μmの無機系又は有機系
ブロッキング防止剤0.01〜0.2重量部 成分C:少なくとも一部は末端が酸変性された数平均分
子量800〜20,000の低分子量ポリプロピレン
0.1〜1重量部
1. A biaxially oriented polypropylene film comprising a composition of the following component A, component B and component C. Component A: 100 parts by weight of crystalline propylene polymer Component B: 0.01 to 0.2 parts by weight of an inorganic or organic antiblocking agent having an average particle size of 0.5 to 3 μm Component C: At least a part of the end Acid-modified low-molecular-weight polypropylene having a number average molecular weight of 800 to 20,000 0.1 to 1 part by weight
JP22895492A 1992-08-27 1992-08-27 Biaxially oriented polypropylene film Expired - Lifetime JP3267688B2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP22895492A JP3267688B2 (en) 1992-08-27 1992-08-27 Biaxially oriented polypropylene film

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP22895492A JP3267688B2 (en) 1992-08-27 1992-08-27 Biaxially oriented polypropylene film

Publications (2)

Publication Number Publication Date
JPH0673202A true JPH0673202A (en) 1994-03-15
JP3267688B2 JP3267688B2 (en) 2002-03-18

Family

ID=16884466

Family Applications (1)

Application Number Title Priority Date Filing Date
JP22895492A Expired - Lifetime JP3267688B2 (en) 1992-08-27 1992-08-27 Biaxially oriented polypropylene film

Country Status (1)

Country Link
JP (1) JP3267688B2 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0859915A (en) * 1994-08-17 1996-03-05 Toyobo Co Ltd Biaxially oriented polypropylene film
JP2000053813A (en) * 1998-06-03 2000-02-22 Japan Polychem Corp Polyolefin resin composition and oriented film therefrom
JP2013064060A (en) * 2011-09-16 2013-04-11 Japan Polypropylene Corp Polypropylene resin composition, and laminate and biaxially stretched polypropylene film comprising the same
JP2013079343A (en) * 2011-10-05 2013-05-02 Japan Polypropylene Corp Polypropylene-based resin composition, and laminate and biaxially oriented polypropylene film including the same

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0859915A (en) * 1994-08-17 1996-03-05 Toyobo Co Ltd Biaxially oriented polypropylene film
JP2000053813A (en) * 1998-06-03 2000-02-22 Japan Polychem Corp Polyolefin resin composition and oriented film therefrom
JP2013064060A (en) * 2011-09-16 2013-04-11 Japan Polypropylene Corp Polypropylene resin composition, and laminate and biaxially stretched polypropylene film comprising the same
JP2013079343A (en) * 2011-10-05 2013-05-02 Japan Polypropylene Corp Polypropylene-based resin composition, and laminate and biaxially oriented polypropylene film including the same

Also Published As

Publication number Publication date
JP3267688B2 (en) 2002-03-18

Similar Documents

Publication Publication Date Title
JPH06297657A (en) Biaxially stretched double layer film
US5811493A (en) Paper-like film
JP3267688B2 (en) Biaxially oriented polypropylene film
JPH11106520A (en) Antiblocking agent masterbatch and biaxially oriented polypropylene film made by using it
JPH0458789B2 (en)
JPH02258852A (en) Polypropylene film
JP2001071431A (en) Multilayered stretched polypropylene film
JPH06200092A (en) Biaxially stretched polypropylene film
JP3360450B2 (en) Polypropylene composition and stretched film thereof
JPS6058444A (en) Olefinic polymer composition
JP3384460B2 (en) Polypropylene film with improved slip properties
EP0457568A2 (en) Polypropylene-polybutylene compositions
JPH0331348A (en) Polyolefin resin composition and film
JP3545132B2 (en) Polyamide film with excellent pinhole resistance and slipperiness
JP2001106628A (en) Substrate film for pasting and pasting material
JPS62232448A (en) Propylene copolymer film
JP4240629B2 (en) Biaxially stretched multilayer film
JP3193964B2 (en) Adhesive laminated film
JPH11349751A (en) Polypropylene-based resin composition and its oriented film
JP2001071432A (en) Multilayered stretched polypropylene film
JPH0547384B2 (en)
JPH08291233A (en) Polypropylene resin composition for drawn film
JP2000302926A (en) Polypropylene composition for drawn film
WO2001040358A1 (en) Polypropylene blends and films prepared therewith
JPS6185458A (en) Propylene copolymer composition for film

Legal Events

Date Code Title Description
S533 Written request for registration of change of name

Free format text: JAPANESE INTERMEDIATE CODE: R313533

R350 Written notification of registration of transfer

Free format text: JAPANESE INTERMEDIATE CODE: R350

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

R250 Receipt of annual fees

Free format text: JAPANESE INTERMEDIATE CODE: R250

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090111

Year of fee payment: 7

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20090111

Year of fee payment: 7

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20100111

Year of fee payment: 8

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 9

Free format text: PAYMENT UNTIL: 20110111

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20110111

Year of fee payment: 9

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120111

Year of fee payment: 10

FPAY Renewal fee payment (prs date is renewal date of database)

Free format text: PAYMENT UNTIL: 20120111

Year of fee payment: 10

FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 11

Free format text: PAYMENT UNTIL: 20130111

EXPY Cancellation because of completion of term
FPAY Renewal fee payment (prs date is renewal date of database)

Year of fee payment: 11

Free format text: PAYMENT UNTIL: 20130111