JP2000238122A - Aliphatic polyester film - Google Patents
Aliphatic polyester filmInfo
- Publication number
- JP2000238122A JP2000238122A JP4512799A JP4512799A JP2000238122A JP 2000238122 A JP2000238122 A JP 2000238122A JP 4512799 A JP4512799 A JP 4512799A JP 4512799 A JP4512799 A JP 4512799A JP 2000238122 A JP2000238122 A JP 2000238122A
- Authority
- JP
- Japan
- Prior art keywords
- aliphatic polyester
- film
- biaxially stretched
- longitudinal direction
- less
- 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.)
- Withdrawn
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- 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)
- Biological Depolymerization Polymers (AREA)
Abstract
Description
【0001】[0001]
【発明の属する技術分野】本発明は、新規な脂肪族ポリ
エステル系二軸延伸フィルムに関する。The present invention relates to a novel aliphatic polyester-based biaxially stretched film.
【0002】[0002]
【従来の技術】従来、ポリ乳酸をはじめとする脂肪族ポ
リエステル系フィルムは、自然環境下に棄却された場合
に容易に分解されること、例えばポリ乳酸フィルムは土
壌中において自然に加水分解されたのち微生物によって
無害な分解物となることを利点として、種々開発されて
きた。2. Description of the Related Art Conventionally, aliphatic polyester films such as polylactic acid are easily decomposed when disposed in a natural environment. For example, polylactic acid films are naturally hydrolyzed in soil. Later, various methods have been developed with the advantage of becoming harmless decomposition products by microorganisms.
【0003】このような生分解性フィルムとして、ポリ
乳酸系重合体からなり、面配向度ΔPが3.0×10-3
以上であり、且つフィルムを昇温したときの結晶化融解
熱量ΔHmと昇温中の結晶化により発生する結晶化熱量
ΔHcとの差(ΔHm−ΔHc)が20J/g以上であ
る、実用的な強度及び熱寸法安定性を有するフィルムが
知られている(特開平7−207041号公報)。[0003] Such a biodegradable film is made of a polylactic acid polymer and has a plane orientation degree ΔP of 3.0 × 10 -3.
And a difference (ΔHm−ΔHc) between the heat of crystallization ΔHm when the film is heated and the heat of crystallization ΔHc generated by crystallization during the temperature rise is 20 J / g or more. A film having strength and thermal dimensional stability is known (JP-A-7-207041).
【0004】しかしながら、上記ポリ乳酸系フィルム
は、自然界で分解させることを優先して開発を進めた結
果、本来脂肪族ポリエステルが持つ優れた特性を十分に
引き出すことが出来ていなかった。即ち、生分解性を重
視するために、フィルムの配向・結晶化が十分ではな
く、強度や熱寸法安定性が不十分なものとなった。[0004] However, as a result of the development of the polylactic acid-based film with a priority on decomposing it in the natural world, the excellent properties inherent to aliphatic polyesters could not be fully obtained. That is, since importance was placed on biodegradability, orientation and crystallization of the film were not sufficient, and strength and thermal dimensional stability were insufficient.
【0005】その結果、生鮮食品、加工食品、医薬品、
医療機器、電子部品等の包装用フィルムとして用いる場
合、このようなフィルムでは、包装用途のフィルムとし
て必要とされる印刷やラミネートの加工工程において寸
法変化を生じたり、しわが発生する等の問題点があるこ
とが明らかになった。As a result, fresh foods, processed foods, pharmaceuticals,
When used as a packaging film for medical devices, electronic components, etc., such a film has problems such as dimensional changes and wrinkles occurring in a printing or laminating process required as a packaging film. It became clear that there was.
【0006】[0006]
【発明が解決しようとする課題】本発明の目的は、上述
の問題点が解消され、印刷やラミネートの加工工程にお
いて優れた加工適性を有する新規な脂肪族ポリエステル
系二軸延伸フィルムを提供することにある。SUMMARY OF THE INVENTION An object of the present invention is to provide a novel aliphatic polyester-based biaxially stretched film which solves the above-mentioned problems and has excellent workability in a printing or laminating process. It is in.
【0007】[0007]
【課題を解決するための手段】本発明者は、前記従来技
術の問題点を解消すべく、鋭意研究した。その結果、特
定の脂肪族ポリエステルを主成分とするポリマーから成
る二軸延伸フィルムの長手方向の熱収縮率及び幅方向に
おける長手方向の熱収縮率のばらつきをそれぞれ特定値
以下とすることによって、印刷やラミネートの加工工程
において寸法変化を生じたり、しわを発生したりするこ
とがない優れた加工適性を持つ、一般包装用基材として
有用なフィルムが得られることを見出し、本発明を完成
するに至った。Means for Solving the Problems The inventor of the present invention has made intensive studies to solve the problems of the prior art. As a result, the variation in the heat shrinkage in the longitudinal direction and the heat shrinkage in the longitudinal direction in the width direction of the biaxially stretched film made of a polymer containing a specific aliphatic polyester as a main component are each set to a specific value or less, thereby printing. It has been found that a film useful as a general packaging base material can be obtained, which has excellent workability without causing dimensional changes or wrinkles in the processing steps of laminating and laminating, and completing the present invention. Reached.
【0008】即ち、本発明は、主たる繰り返し単位が、
一般式 −O−CHR−CO− (I) (式中、Rは、H又は炭素数1〜3のアルキル基を示
す。)で表される単位である脂肪族ポリエステルから成
り、120℃における、その長手方向の熱収縮率が5%
以下であり且つその幅方向における長手方向の熱収縮率
のばらつきが30%以下であることを特徴とする脂肪族
ポリエステル系二軸延伸フィルムに係る。That is, in the present invention, the main repeating unit is
It consists of aliphatic polyester which is a unit represented by general formula -O-CHR-CO- (I) (wherein, R represents H or an alkyl group having 1 to 3 carbon atoms). The heat shrinkage in the longitudinal direction is 5%
The present invention relates to an aliphatic polyester-based biaxially stretched film, characterized in that the heat shrinkage in the longitudinal direction in the width direction is not more than 30%.
【0009】[0009]
【発明の実施の形態】本発明における脂肪族ポリエステ
ルとしては、主たる繰り返し単位が、一般式(I)で表
される単位である脂肪族ポリエステル、例えばポリ乳
酸、ポリグリコール酸、ポリ(2−オキシ酪酸)等を挙
げることができるが、これらに限定されるものではな
い。BEST MODE FOR CARRYING OUT THE INVENTION As the aliphatic polyester in the present invention, an aliphatic polyester whose main repeating unit is a unit represented by the general formula (I), for example, polylactic acid, polyglycolic acid, poly (2-oxy Butyric acid) and the like, but are not limited thereto.
【0010】また、これら脂肪族ポリエステルの単独で
も良く、或いは混合物でも良い。また、上記一般式
(I)の単位の共重合体を使用しても構わない。脂肪族
ポリエステル中に不斉炭素を有する場合は、L−体、D
L−体、D−体といった光学異性体が存在するが、それ
らのいずれでも良く、また、それら異性体の混合物でも
良い。更に、本発明の効果を阻害しない範囲で、他の高
分子材料が混入されても構わない。[0010] These aliphatic polyesters may be used alone or in a mixture. Further, a copolymer of the unit of the general formula (I) may be used. When the aliphatic polyester has an asymmetric carbon, L-form, D-form
There are optical isomers such as L-form and D-form, and any of them may be used, or a mixture of these isomers may be used. Further, other polymer materials may be mixed as long as the effects of the present invention are not impaired.
【0011】これらのフィルムの素材となる上述した脂
肪族ポリエステル(以下、単に「ポリマー」ということ
がある。)は、対応するα−オキシ酸の脱水環状エステ
ル化合物を開環重合等の公知の方法に供して製造され
る。The above-mentioned aliphatic polyester (hereinafter, may be simply referred to as “polymer”) as a material of these films is obtained by subjecting the corresponding dehydrated cyclic ester compound of α-oxy acid to a known method such as ring-opening polymerization. Manufactured for
【0012】本発明において、用いられる脂肪族ポリエ
ステルは、重量平均分子量で、1万以上50万以下であ
る。1万未満であると、得られたフィルムの物性が著し
く劣り、且つ、分解速度が速すぎ本発明の目的を達し得
ない。また、フィルム製造時の押出し性、二軸延伸性も
低下することから重量平均分子量は1万以上である必要
がある。一方、重量平均分子量が50万以上の高粘度重
合体になると溶融押出しが困難になるという問題があ
る。好ましい範囲は、5万以上30万以下である。In the present invention, the aliphatic polyester used has a weight average molecular weight of 10,000 to 500,000. If it is less than 10,000, the physical properties of the obtained film are remarkably inferior, and the decomposition rate is too high to achieve the object of the present invention. In addition, since the extrudability and biaxial stretchability during film production are also reduced, the weight average molecular weight needs to be 10,000 or more. On the other hand, a high viscosity polymer having a weight average molecular weight of 500,000 or more has a problem that melt extrusion becomes difficult. A preferred range is from 50,000 to 300,000.
【0013】本発明の脂肪族ポリエステルからなるフィ
ルムは、押出成形、二軸延伸後に熱固定されたフィルム
であることが好ましく、公知の方法で製膜し延伸され製
造される。The film made of the aliphatic polyester of the present invention is preferably a film heat-set after extrusion molding and biaxial stretching, and is produced by forming a film by a known method and stretching.
【0014】本発明のフィルムを押出成形する方法は、
公知のT−ダイ法、インフレーション法等が適用でき、
これらの方法により未延伸フィルムを得ることができ
る。押出し温度は、用いるポリマーの融解温度(Tm)
〜Tm+70℃の範囲、より好ましくは、Tm+20〜
Tm+50℃の範囲である。The method for extruding the film of the present invention comprises:
Known T-die method, inflation method and the like can be applied,
An unstretched film can be obtained by these methods. The extrusion temperature is the melting temperature (Tm) of the polymer used.
To Tm + 70 ° C., more preferably Tm + 20 to
Tm + 50 ° C.
【0015】押出し温度が低すぎると押出し安定性が得
難く、又過負荷に陥りやすい。また、逆に高すぎるとポ
リマーの分解が激しくなるので好ましくない。本発明で
用いる押出機のダイは、環状又は線状のスリットを有す
るものでよい。ダイの温度は押出温度範囲と同じ程度で
良い。If the extrusion temperature is too low, it is difficult to obtain extrusion stability, and it is easy to fall into overload. On the other hand, if it is too high, the decomposition of the polymer becomes severe, which is not preferable. The die of the extruder used in the present invention may have an annular or linear slit. The temperature of the die may be as high as the extrusion temperature range.
【0016】未延伸フィルムの二軸延伸は、一軸目の延
伸と二軸目の延伸を逐次に行っても、同時に行っても良
い。The biaxial stretching of the unstretched film may be carried out sequentially or simultaneously with the stretching of the first axis and the stretching of the second axis.
【0017】尚、本発明二軸延伸フィルムにおける長手
方向とは縦延伸方向を意味し、又幅方向とは横延伸方向
を意味する。In the biaxially stretched film of the present invention, the longitudinal direction means the longitudinal stretching direction, and the width direction means the transverse stretching direction.
【0018】延伸温度は、用いるポリマーのガラス転移
温度(Tg)〜Tg+50℃の範囲が好ましい。より好
ましくはTg+10〜Tg+40℃の範囲である。延伸
温度がTg未満では延伸が困難であり、Tg+50℃を
越えると厚み均一性や得られたフィルムの機械的強度が
低下し好ましくない。The stretching temperature is preferably in the range of the glass transition temperature (Tg) of the polymer used to Tg + 50 ° C. More preferably, it is in the range of Tg + 10 to Tg + 40 ° C. If the stretching temperature is lower than Tg, stretching is difficult, and if it exceeds Tg + 50 ° C., the thickness uniformity and the mechanical strength of the obtained film are undesirably reduced.
【0019】縦、横の延伸は1段階でも多段階に分けて
行っても良いが、それぞれの延伸方向に最終的には少な
くとも3倍以上、更に好ましくは、3.5倍以上、又縦
・横面積倍率で9倍以上、更に好ましくは12倍以上延
伸することが厚みの均一性や機械的性質の点から必要で
ある。縦、横延伸比がそれぞれ3倍未満、又面積倍率が
9倍未満では、厚み均一性の良いフィルムは得られず、
又機械的強度等の物性の向上も乏しい。延伸倍率の上限
は、製膜中にフィルムの破断が生じない限り、限定され
ない。The stretching in the vertical and horizontal directions may be performed in one stage or in multiple stages, but is ultimately at least 3 times, more preferably 3.5 times or more in each stretching direction. Stretching at a lateral area magnification of 9 times or more, more preferably 12 times or more is necessary from the viewpoint of uniformity of thickness and mechanical properties. If the longitudinal and transverse stretching ratios are each less than 3 times and the area magnification is less than 9 times, a film having good thickness uniformity cannot be obtained,
Also, the improvement of physical properties such as mechanical strength is poor. The upper limit of the stretching ratio is not limited as long as the film does not break during film formation.
【0020】本発明における長手方向の熱収縮率及び幅
方向の熱収縮率のばらつきを所定の範囲とするため重要
なことは、縦延伸を二段以上で行い、少なくとも一回は
Tg+20〜Tg+40℃の範囲で延伸速度が1000
0%/分、好ましくは15000%/分、さらに好まし
くは20000%/分以上で延伸する工程を含むことで
ある。延伸速度の上限は、製膜中にフィルムの破断が生
じない限り、限定されない。It is important that the variation in the thermal shrinkage in the longitudinal direction and the thermal shrinkage in the width direction in the present invention be within a predetermined range. The longitudinal stretching is performed in two or more stages, and at least once at Tg + 20 to Tg + 40 ° C. Stretching speed of 1000 in the range of
The method includes a step of stretching at 0% / min, preferably 15000% / min, more preferably 20,000% / min or more. The upper limit of the stretching speed is not limited as long as the film does not break during film formation.
【0021】上記フィルムの二軸延伸をした後、通常、
150℃以上Tm以下好ましくは155℃以上Tm以下
の温度で熱固定を行い、更に120℃以上熱固定温度以
下の温度で1〜10%程度好ましくは2〜8%程度横弛
緩処理を行う。After the above film is biaxially stretched, usually,
The heat setting is performed at a temperature of 150 ° C. or more and Tm or less, preferably 155 ° C. or more and Tm or less, and a lateral relaxation treatment is performed at a temperature of 120 ° C. or more and a heat fixing temperature of about 1 to 10%, preferably about 2 to 8%.
【0022】本発明の脂肪族ポリエステル系二軸延伸フ
ィルムは、製造工程において共押出し法やコーティング
法によって複層化されてもよい。また、本発明のフィル
ムは、表面エネルギーを向上する目的で、コロナ処理、
プラズマ処理、火炎処理等を施しても良い。The biaxially stretched aliphatic polyester film of the present invention may be multi-layered by a coextrusion method or a coating method in the production process. Further, the film of the present invention, for the purpose of improving the surface energy, corona treatment,
Plasma treatment, flame treatment, or the like may be performed.
【0023】本発明の原料脂肪族ポリエステルには、公
知の添加剤を必要に応じて含有させることができる。例
えば、滑剤、ブロッキング防止剤、熱安定剤、酸化防止
剤、帯電防止剤、耐光剤、耐衝撃性改良剤等を含有させ
てもよい。但し、本発明の脂肪族ポリエステル系二軸延
伸フィルムは、ヒートシール層を形成された後、透明で
内容物が見える必要があるので、ヒートシール層を形成
された後においても高い透明性を保持できる範囲内での
使用が必要となる。The raw material aliphatic polyester of the present invention may contain known additives as necessary. For example, it may contain a lubricant, an antiblocking agent, a heat stabilizer, an antioxidant, an antistatic agent, a lightfast agent, an impact resistance improver, and the like. However, since the aliphatic polyester-based biaxially stretched film of the present invention is required to be transparent and its contents visible after the heat seal layer is formed, high transparency is maintained even after the heat seal layer is formed. It is necessary to use it within the possible range.
【0024】滑剤としては、例えばシリカ、二酸化チタ
ン、タルク、カオリナイト等の金属酸化物、炭酸カルシ
ウム、リン酸カルシウム、硫酸バリウム等の金属の塩、
又は架橋ポリスチレン樹脂、架橋アクリル樹脂、シリコ
ン樹脂、架橋ポリエステル樹脂等の有機樹脂からなる粒
子等の脂肪族ポリエステルに対し不活性な粒子が例示で
きる。Examples of the lubricant include metal oxides such as silica, titanium dioxide, talc and kaolinite; salts of metals such as calcium carbonate, calcium phosphate and barium sulfate;
Alternatively, particles inert to aliphatic polyester such as particles made of an organic resin such as a crosslinked polystyrene resin, a crosslinked acrylic resin, a silicone resin, and a crosslinked polyester resin can be exemplified.
【0025】これらの滑剤は、いずれか一種を単独で用
いてもよく、又2種以上を併用してもよいが、使用する
滑剤の平均粒子径は0.01μm以上3.0μm以下が
好ましく、0.05μm以上2.5μm以下がより好ま
しい。その添加量としては、0.005重量%以上2重
量%以下含有していることが好ましく、0.01重量%
以上1.0重量%以下含有していることがフィルムの透
明性及び滑り性を両立するためにより好ましい。Any one of these lubricants may be used alone, or two or more thereof may be used in combination. The average particle size of the lubricant used is preferably 0.01 μm or more and 3.0 μm or less. The thickness is more preferably 0.05 μm or more and 2.5 μm or less. The amount of addition is preferably 0.005% by weight or more and 2% by weight or less, preferably 0.01% by weight or less.
More than 1.0% by weight is more preferable in order to achieve both transparency and slipperiness of the film.
【0026】また、特に透明性と滑り性を両立する為に
は2種以上の滑剤を併用することが好ましい。特に、フ
ィルムの製膜中に変形する滑剤粒子(例えば、架橋ポリ
スチレン樹脂、架橋アクリル樹脂等の架橋度の低い有機
滑剤、一次粒子の凝集体であるシリカ等の無機滑剤)と
フィルム製膜中に変形しない通常の滑剤粒子を組み合わ
せることが好ましい。In order to achieve both transparency and slipperiness, it is preferable to use two or more lubricants in combination. In particular, lubricant particles that are deformed during film formation (for example, organic lubricants having a low degree of crosslinking such as cross-linked polystyrene resin and cross-linked acrylic resin, and inorganic lubricants such as silica that is an aggregate of primary particles) and during film formation. It is preferable to combine ordinary lubricant particles that do not deform.
【0027】本発明フィルムの厚さは、通常、5〜50
μm程度とするのが良い。The thickness of the film of the present invention is usually from 5 to 50.
It is good to be about μm.
【0028】本発明の脂肪族ポリエステル系二軸延伸フ
ィルムの120℃における長手方向の熱収縮率は、5%
以下である必要があり、好ましくは3%以下である。熱
収縮率が5%より大きいと印刷工程においては印刷ずれ
が発生し、ヒートシール時にはしわが発生するため好ま
しくない。The aliphatic polyester-based biaxially stretched film of the present invention has a heat shrinkage in the longitudinal direction at 120 ° C. of 5%.
Or less, preferably 3% or less. If the heat shrinkage is more than 5%, printing deviation occurs in the printing step, and wrinkles occur during heat sealing, which is not preferable.
【0029】また、本発明の脂肪族ポリエステル系二軸
延伸フィルムの120℃での幅方向における長手方向の
熱収縮率のばらつきは30%以下である必要があり、好
ましくは20%以下、更に好ましくは15%以下であ
る。この熱収縮率のばらつきは、フィルムの幅方向に複
数の等間隔に分割した複数箇所の長手方向の熱収縮率を
測定し、各熱収縮率の平均値に対する最大値と最小値の
差の百分率として、表されるものである。熱収縮率のば
らつきが30%より大きいと印刷やラミネートの工程等
においてフィルムが加熱されるとフィルムに歪みが生じ
て、多色の印刷を実施する場合に色ずれが発生するため
好ましくない。The variation in the heat shrinkage in the longitudinal direction in the width direction at 120 ° C. of the aliphatic polyester-based biaxially stretched film of the present invention must be 30% or less, preferably 20% or less, more preferably 20% or less. Is not more than 15%. This variation in the heat shrinkage is measured by measuring the heat shrinkage in the longitudinal direction at a plurality of locations divided at equal intervals in the width direction of the film, and calculating the percentage of the difference between the maximum value and the minimum value with respect to the average value of each heat shrinkage. Is represented as If the variation of the heat shrinkage is more than 30%, the film is distorted when the film is heated in a printing or laminating step, and the color shift occurs when performing multi-color printing, which is not preferable.
【0030】また、本発明における脂肪族ポリエステル
系二軸延伸フィルムの厚み方向の屈折率(Nz)は、好
ましくは1.440以上1.455以下であり、より好
ましくは1.445以上1.455以下である。Nzが
1.440未満ではフィルムを製膜する工程において破
断が発生しやすくなる。また、1.455を越えると印
刷やラミネートの工程等でフィルムが加熱された場合に
平面性の乱れを発生するため好ましくない。Further, the refractive index (Nz) in the thickness direction of the aliphatic polyester-based biaxially stretched film in the present invention is preferably from 1.440 to 1.455, more preferably from 1.445 to 1.455. It is as follows. When Nz is less than 1.440, breakage is likely to occur in the step of forming a film. On the other hand, if it exceeds 1.455, flatness is disturbed when the film is heated in a printing or laminating step, which is not preferable.
【0031】更に、本発明の脂肪族ポリエステル系二軸
延伸フィルムにおいて、その長手方向の屈折率(Nx)か
ら幅方向の屈折率(Ny)を差し引いた値(Nx−Ny)
が、−0.020以上0以下であるのが好ましく、−
0.015以上0以下であるのがより好ましい。Nx−
Nyが−0.020未満では印刷やラミネートの工程等
でフィルムが加熱された場合に、フィルムの搬送張力に
より引き伸ばされ、印刷ずれ及び波うちを発生し平面性
が悪化するため好ましくない。また、Nx−Nyが0以
上では厚みむらが大きくなりやすい。Further, in the aliphatic polyester-based biaxially stretched film of the present invention, the value obtained by subtracting the refractive index (Ny) in the width direction from the refractive index (Nx) in the longitudinal direction (Nx-Ny).
Is preferably −0.020 or more and 0 or less,
It is more preferably 0.015 or more and 0 or less. Nx-
When Ny is less than -0.020, when the film is heated in a printing or laminating step, the film is stretched due to the transport tension of the film, which causes printing misalignment and ripples, which deteriorates the flatness, which is not preferable. When Nx-Ny is 0 or more, thickness unevenness tends to increase.
【0032】[0032]
【実施例】以下、実施例及び比較例を挙げて、本発明の
内容及び効果を更に具体的に説明するが、本発明は、そ
の要旨を逸脱しない限り以下の実施例に限定されるもの
ではない。EXAMPLES Hereinafter, the contents and effects of the present invention will be described more specifically with reference to examples and comparative examples. However, the present invention is not limited to the following examples unless departing from the gist thereof. Absent.
【0033】以下の実施例及び比較例における物性の評
価方法は以下の通りである。The methods for evaluating physical properties in the following Examples and Comparative Examples are as follows.
【0034】(1)長手方向の熱収縮率 フィルムを幅10mm、長さ250mm取り、200m
m間隔で印をつけ5gの一定張力で間隔Aを測る。続い
て、無荷重で30分間、120℃の雰囲気中のオーブン
に入れた後の印の間隔Bを、5gの一定張力で測り、以
下の式により熱収縮率を求めた。(1) Thermal shrinkage in the longitudinal direction A film was taken at a width of 10 mm and a length of 250 mm,
Mark at m intervals and measure interval A at a constant tension of 5 g. Subsequently, the interval B between marks after being placed in an oven in an atmosphere of 120 ° C. for 30 minutes with no load was measured at a constant tension of 5 g, and the heat shrinkage was determined by the following equation.
【0035】 熱収縮率(%)=〔(A−B)/A〕×100 (2)幅方向における長手方向の熱収縮率のばらつき フィルムの幅方向に5等分した5箇所の長手方向の熱収
縮率を上記(1)の方法で測定し、下式からフィルム幅
方向における長手方向の熱収縮率のばらつきを算出し
た。Heat shrinkage (%) = [(A−B) / A] × 100 (2) Variation of heat shrinkage in the longitudinal direction in the width direction Five points in the longitudinal direction divided into five equal parts in the width direction of the film The heat shrinkage was measured by the above method (1), and the variation in the heat shrinkage in the longitudinal direction in the film width direction was calculated from the following equation.
【0036】熱収縮率のばらつき(%)=〔(最大値−
最小値)/平均値〕×100 (3)厚み方向、長手方向及び幅方向の屈折率(Nz、
Nx、Ny) 株式会社アタゴ製の「アッベ屈折計1T」を用いて、そ
れぞれの屈折率を測定した。Variation in heat shrinkage (%) = [(maximum value−
(Minimum value) / average value] × 100 (3) Refractive index (Nz, thickness direction, longitudinal direction and width direction)
Nx, Ny) Each refractive index was measured using “Abbe refractometer 1T” manufactured by Atago Co., Ltd.
【0037】(4)加工適性 各実施例及び比較例で得られた熱可塑性フィルムの上に
グラビアインキ(「ラミエース61白二液タイプ」、東
洋インキ社製)をグラビア印刷して印刷インキ層を形成
し、次いで接着剤「AD585/CAT−10」(東洋
モートン社製)を2g/m2塗布した後、常法に従って
60μmの未延伸ポリプロピレンフィルム(「P112
0」、東洋紡績製)をドライラミネート法にて貼り合わ
せてシーラント層を設け、脂肪族ポリエステル系フィル
ム積層体を得た。この工程においてフィルムの状態を観
察し、印刷及びラミネートの工程における加工適性を、
しわ及び印刷ずれの各項目について、下記基準に基づ
き、三段階評価した。(4) Processing Suitability Gravure ink (“Lamiace 61 white two-part type”, manufactured by Toyo Ink Co., Ltd.) is gravure-printed on the thermoplastic films obtained in each of Examples and Comparative Examples to form a printing ink layer. After forming and then applying 2 g / m 2 of an adhesive “AD585 / CAT-10” (manufactured by Toyo Morton Co., Ltd.), a 60 μm unstretched polypropylene film (“P112
0 "(manufactured by Toyobo Co., Ltd.) by a dry lamination method to form a sealant layer to obtain an aliphatic polyester film laminate. Observe the state of the film in this process, the processing suitability in the printing and lamination process,
Each item of wrinkles and print misalignment was evaluated on a three-point scale based on the following criteria.
【0038】しわ:○;しわが無く、フィルムの状態良
好、 △;しわが若干発生、 ×;平面性悪化が見られ、しわが発生。Wrinkles: ;: no wrinkles, good film condition, Δ: slight wrinkles, ×: poor flatness, wrinkles
【0039】印刷ずれ:○;印刷ずれが無く、フィルム
の状態良好、 △;印刷ずれが若干発生、 ×;平面性悪化が見られ、印刷ずれが発生。Print shift: ;: No print shift, good film condition; Δ: Slight print shift, ×: Deterioration of flatness and print shift.
【0040】(5)製膜状況 二軸延伸を連続3時間実施したとき、フィルムの破断が
発生しない又は1回発生を良好とし、フィルムの破断が
2回以上発生を破断発生とした。(5) Film-forming condition When biaxial stretching was carried out for 3 hours continuously, no breakage of the film was generated or it was determined that the film was broken once.
【0041】実施例1 重量平均分子量25万のポリ−L−乳酸(Tg=61.
6℃、Tm=170℃)100重量部に対し、表面突起
を形成するための滑剤として平均粒子径1.8μmの凝
集体シリカ粒子を0.06重量部添加した組成物を、T
ダイ付き口径30mm押出機を使用して、樹脂温度21
0℃で押出した後、20℃のチルロールで冷却し、厚さ
300μmの未延伸フィルムを得た。複数本のセラミッ
クロールによりフィルム温度を95℃に予熱しロール間
で28000%/分の延伸速度で縦方向に1.5倍延伸
し、更に97℃で2.7倍縦方向に延伸した。次いで、
テンター式延伸機で横方向に80℃で3.8倍延伸した
後、155℃で熱固定した後、135℃で3%横弛緩処
理を行った。かくして、厚さ20μmの本発明二軸延伸
フィルムを得た。表1にその物性を示す。Example 1 Poly-L-lactic acid having a weight average molecular weight of 250,000 (Tg = 61.
(6 ° C., Tm = 170 ° C.) A composition in which 0.06 part by weight of aggregated silica particles having an average particle diameter of 1.8 μm as a lubricant for forming surface projections was added to 100 parts by weight of T
Using a 30 mm extruder with a die and a resin temperature of 21
After extruding at 0 ° C., it was cooled with a chill roll at 20 ° C. to obtain an unstretched film having a thickness of 300 μm. The film temperature was preheated to 95 ° C. by a plurality of ceramic rolls, stretched 1.5 times in the machine direction at a stretching speed of 28000% / min between the rolls, and further stretched 2.7 times in the machine direction at 97 ° C. Then
The film was stretched 3.8 times in the transverse direction at 80 ° C. with a tenter-type stretching machine, heat-set at 155 ° C., and then subjected to a 3% transverse relaxation treatment at 135 ° C. Thus, a biaxially stretched film of the present invention having a thickness of 20 μm was obtained. Table 1 shows the physical properties.
【0042】比較例1 実施例1において縦延伸を複数本のセラミックロールに
よりフィルム温度95℃に予熱しロール間で28000
%/分の延伸速度で縦方向に2.5倍に一段延伸で実施
した以外は実施例1とまったく同様の方法で、比較用の
二軸延伸フィルムを得た。表1にその物性を示す。COMPARATIVE EXAMPLE 1 In Example 1, longitudinal stretching was performed by preheating at a film temperature of 95 ° C. using a plurality of ceramic rolls, and 28000 was applied between the rolls.
A biaxially-stretched film for comparison was obtained in exactly the same manner as in Example 1 except that the stretching was performed in a single step at a stretching speed of 2.5% in the machine direction at a stretching speed of% / min. Table 1 shows the physical properties.
【0043】比較例2 実施例1において縦延伸を66℃で3.4倍に一段延伸
で実施した以外は実施例1とまったく同様の方法で、比
較用の二軸延伸フィルムを得た。表1にその物性を示
す。Comparative Example 2 A biaxially stretched film for comparison was obtained in exactly the same manner as in Example 1 except that the longitudinal stretching was carried out at 66 ° C. in 3.4 times by one-step stretching. Table 1 shows the physical properties.
【0044】実施例2 実施例1において縦延伸を12000%/分で実施した
以外は実施例1とまったく同様の方法で、本発明の二軸
延伸フィルムを得た。表1にその物性を示す。Example 2 A biaxially stretched film of the present invention was obtained in the same manner as in Example 1 except that longitudinal stretching was performed at 12,000% / min. Table 1 shows the physical properties.
【0045】比較例3 実施例1において熱固定を140℃で実施した以外は実
施例1とまったく同様の方法で、比較用の二軸延伸フィ
ルムを得た。表1にその物性を示す。Comparative Example 3 A comparative biaxially stretched film was obtained in exactly the same manner as in Example 1 except that the heat setting was performed at 140 ° C. Table 1 shows the physical properties.
【0046】実施例3 実施例1において熱固定を150℃で実施した以外は実
施例1とまったく同様の方法で、本発明の二軸延伸フィ
ルムを得た。表1にその物性を示す。Example 3 A biaxially stretched film of the present invention was obtained in the same manner as in Example 1 except that the heat setting was performed at 150 ° C. Table 1 shows the physical properties.
【0047】[0047]
【表1】 [Table 1]
【0048】[0048]
【発明の効果】本発明の脂肪族ポリエステル系フィルム
は、生鮮食品、加工食品、医薬品、医療機器、電子部品
等の包装用フィルムにおいて重要な特性である印刷やラ
ミネートの加工工程において寸法変化やしわを発生する
ことが無く、平面性悪化や印刷ずれ等の発生しない優れ
た加工適性を有しており、一般包装用フィルムとして極
めて有用である。The aliphatic polyester film of the present invention has dimensional changes and wrinkles in the printing and laminating processing steps, which are important characteristics in packaging films for fresh foods, processed foods, pharmaceuticals, medical equipment, electronic parts and the like. It has excellent processability without causing flatness deterioration and print misregistration, and is extremely useful as a film for general packaging.
───────────────────────────────────────────────────── フロントページの続き (72)発明者 小林 久人 滋賀県大津市堅田2丁目1番1号 東洋紡 績株式会社総合研究所内 (72)発明者 奥平 正 滋賀県大津市堅田2丁目1番1号 東洋紡 績株式会社総合研究所内 Fターム(参考) 4F071 AA43 AA81 AF31 AF61 AH04 BB08 BC01 4F210 AA24A AE01 AG01 QA02 QA03 QC06 QD16 QG01 QG18 QW12 4J002 CF181 FD170 GG02 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Hisato Kobayashi 2-1-1 Katata, Otsu-shi, Shiga Prefecture Toyobo Co., Ltd. Research Institute (72) Inventor Tadashi Okudaira 2-1-1 Katata, Otsu-shi, Shiga Prefecture No. Toyobo Co., Ltd. Research Laboratory F term (reference) 4F071 AA43 AA81 AF31 AF61 AH04 BB08 BC01 4F210 AA24A AE01 AG01 QA02 QA03 QC06 QD16 QG01 QG18 QW12 4J002 CF181 FD170 GG02
Claims (5)
す。)で表される単位である脂肪族ポリエステルから成
り、120℃における、その長手方向の熱収縮率が5%
以下であり且つその幅方向における長手方向の熱収縮率
のばらつきが30%以下であることを特徴とする脂肪族
ポリエステル系二軸延伸フィルム。A main repeating unit is a unit represented by a general formula -O-CHR-CO- (I) (wherein, R represents H or an alkyl group having 1 to 3 carbon atoms). Made of aliphatic polyester, its heat shrinkage in the longitudinal direction at 120 ° C. is 5%
A biaxially stretched aliphatic polyester film, wherein the variation in the heat shrinkage in the longitudinal direction in the width direction is 30% or less.
上1.455以下であり、且つ120℃における長手方
向の熱収縮率が3%以下であることを特徴とする請求項
1に記載の脂肪族ポリエステル系二軸延伸フィルム。2. The method according to claim 1, wherein the refractive index (Nz) in the thickness direction is from 1.440 to 1.455, and the heat shrinkage in the longitudinal direction at 120 ° C. is 3% or less. 3. The biaxially stretched aliphatic polyester film according to item 1.
率(Ny)を差し引いた値(Nx−Ny)が、−0.020
以上0以下であることを特徴とする請求項1又は2に記
載の脂肪族ポリエステル系二軸延伸フィルム。3. A value (Nx-Ny) obtained by subtracting a refractive index (Ny) in a width direction from a refractive index (Nx) in a longitudinal direction is -0.020.
The aliphatic polyester-based biaxially stretched film according to claim 1 or 2, wherein the number is 0 or less.
1万以上50万以下である請求項1、2又は3に記載の
脂肪族ポリエステル系二軸延伸フィルム。4. The weight average molecular weight of the aliphatic polyester is as follows:
The aliphatic polyester-based biaxially stretched film according to claim 1, 2 or 3, having a molecular weight of 10,000 to 500,000.
ことを特徴とする請求項1、2、3又は4に記載の脂肪
族ポリエステル系二軸延伸フィルム。5. The biaxially stretched aliphatic polyester film according to claim 1, wherein the aliphatic polyester is polylactic acid.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4512799A JP2000238122A (en) | 1999-02-23 | 1999-02-23 | Aliphatic polyester film |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP4512799A JP2000238122A (en) | 1999-02-23 | 1999-02-23 | Aliphatic polyester film |
Publications (1)
Publication Number | Publication Date |
---|---|
JP2000238122A true JP2000238122A (en) | 2000-09-05 |
Family
ID=12710616
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP4512799A Withdrawn JP2000238122A (en) | 1999-02-23 | 1999-02-23 | Aliphatic polyester film |
Country Status (1)
Country | Link |
---|---|
JP (1) | JP2000238122A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000238125A (en) * | 1999-02-25 | 2000-09-05 | Toyobo Co Ltd | Aliphatic polyester film |
-
1999
- 1999-02-23 JP JP4512799A patent/JP2000238122A/en not_active Withdrawn
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2000238125A (en) * | 1999-02-25 | 2000-09-05 | Toyobo Co Ltd | Aliphatic polyester film |
JP4644885B2 (en) * | 1999-02-25 | 2011-03-09 | 東洋紡績株式会社 | Aliphatic polyester film |
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