JP2004345271A - Multilayer biaxially oriented polypropylene film - Google Patents
Multilayer biaxially oriented polypropylene film Download PDFInfo
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- JP2004345271A JP2004345271A JP2003146048A JP2003146048A JP2004345271A JP 2004345271 A JP2004345271 A JP 2004345271A JP 2003146048 A JP2003146048 A JP 2003146048A JP 2003146048 A JP2003146048 A JP 2003146048A JP 2004345271 A JP2004345271 A JP 2004345271A
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- polypropylene resin
- surface layer
- propylene
- polypropylene
- film
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- 229920006378 biaxially oriented polypropylene Polymers 0.000 title abstract description 7
- 239000011127 biaxially oriented polypropylene Substances 0.000 title abstract description 7
- -1 polypropylene Polymers 0.000 claims abstract description 97
- 239000004743 Polypropylene Substances 0.000 claims abstract description 87
- 229920001155 polypropylene Polymers 0.000 claims abstract description 87
- 239000011347 resin Substances 0.000 claims abstract description 58
- 229920005989 resin Polymers 0.000 claims abstract description 58
- 239000010410 layer Substances 0.000 claims abstract description 45
- 239000002344 surface layer Substances 0.000 claims abstract description 44
- 239000002216 antistatic agent Substances 0.000 claims abstract description 29
- 239000000203 mixture Substances 0.000 claims abstract description 19
- 229920005604 random copolymer Polymers 0.000 claims description 32
- 238000002844 melting Methods 0.000 claims description 29
- 230000008018 melting Effects 0.000 claims description 29
- 239000000463 material Substances 0.000 claims description 25
- 229920000642 polymer Polymers 0.000 claims description 25
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 claims description 17
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 claims description 14
- 229920001384 propylene homopolymer Polymers 0.000 claims description 6
- 239000004433 Thermoplastic polyurethane Substances 0.000 claims description 3
- 125000003827 glycol group Chemical group 0.000 claims description 3
- 229920001515 polyalkylene glycol Polymers 0.000 claims description 3
- 229920006146 polyetheresteramide block copolymer Polymers 0.000 claims description 3
- 229920002803 thermoplastic polyurethane Polymers 0.000 claims description 3
- 239000003112 inhibitor Substances 0.000 claims 1
- 239000000155 melt Substances 0.000 claims 1
- 239000005026 oriented polypropylene Substances 0.000 claims 1
- 239000008188 pellet Substances 0.000 description 17
- 239000003963 antioxidant agent Substances 0.000 description 16
- 230000003078 antioxidant effect Effects 0.000 description 16
- 238000000034 method Methods 0.000 description 12
- VXNZUUAINFGPBY-UHFFFAOYSA-N 1-Butene Chemical compound CCC=C VXNZUUAINFGPBY-UHFFFAOYSA-N 0.000 description 10
- 239000003795 chemical substances by application Substances 0.000 description 9
- 230000000694 effects Effects 0.000 description 8
- 230000003472 neutralizing effect Effects 0.000 description 8
- BGYHLZZASRKEJE-UHFFFAOYSA-N [3-[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxy]-2,2-bis[3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoyloxymethyl]propyl] 3-(3,5-ditert-butyl-4-hydroxyphenyl)propanoate Chemical compound CC(C)(C)C1=C(O)C(C(C)(C)C)=CC(CCC(=O)OCC(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)(COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)COC(=O)CCC=2C=C(C(O)=C(C=2)C(C)(C)C)C(C)(C)C)=C1 BGYHLZZASRKEJE-UHFFFAOYSA-N 0.000 description 7
- 230000015572 biosynthetic process Effects 0.000 description 7
- CJZGTCYPCWQAJB-UHFFFAOYSA-L calcium stearate Chemical compound [Ca+2].CCCCCCCCCCCCCCCCCC([O-])=O.CCCCCCCCCCCCCCCCCC([O-])=O CJZGTCYPCWQAJB-UHFFFAOYSA-L 0.000 description 7
- 239000008116 calcium stearate Substances 0.000 description 7
- 235000013539 calcium stearate Nutrition 0.000 description 7
- 230000000704 physical effect Effects 0.000 description 7
- 239000000843 powder Substances 0.000 description 7
- 239000004711 α-olefin Substances 0.000 description 6
- LIKMAJRDDDTEIG-UHFFFAOYSA-N 1-hexene Chemical compound CCCCC=C LIKMAJRDDDTEIG-UHFFFAOYSA-N 0.000 description 5
- 230000000052 comparative effect Effects 0.000 description 5
- 238000002156 mixing Methods 0.000 description 5
- KWKAKUADMBZCLK-UHFFFAOYSA-N 1-octene Chemical compound CCCCCCC=C KWKAKUADMBZCLK-UHFFFAOYSA-N 0.000 description 4
- 238000004806 packaging method and process Methods 0.000 description 4
- YWAKXRMUMFPDSH-UHFFFAOYSA-N pentene Chemical compound CCCC=C YWAKXRMUMFPDSH-UHFFFAOYSA-N 0.000 description 4
- 238000004519 manufacturing process Methods 0.000 description 3
- 239000000126 substance Substances 0.000 description 3
- ZGEGCLOFRBLKSE-UHFFFAOYSA-N 1-Heptene Chemical compound CCCCCC=C ZGEGCLOFRBLKSE-UHFFFAOYSA-N 0.000 description 2
- WWUVJRULCWHUSA-UHFFFAOYSA-N 2-methyl-1-pentene Chemical compound CCCC(C)=C WWUVJRULCWHUSA-UHFFFAOYSA-N 0.000 description 2
- WSSSPWUEQFSQQG-UHFFFAOYSA-N 4-methyl-1-pentene Chemical compound CC(C)CC=C WSSSPWUEQFSQQG-UHFFFAOYSA-N 0.000 description 2
- VQTUBCCKSQIDNK-UHFFFAOYSA-N Isobutene Chemical compound CC(C)=C VQTUBCCKSQIDNK-UHFFFAOYSA-N 0.000 description 2
- 239000004721 Polyphenylene oxide Substances 0.000 description 2
- 239000002981 blocking agent Substances 0.000 description 2
- 125000004432 carbon atom Chemical group C* 0.000 description 2
- 229920001940 conductive polymer Polymers 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 238000001816 cooling Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000010438 heat treatment Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 239000000314 lubricant Substances 0.000 description 2
- TVMXDCGIABBOFY-UHFFFAOYSA-N n-Octanol Natural products CCCCCCCC TVMXDCGIABBOFY-UHFFFAOYSA-N 0.000 description 2
- 229920000570 polyether Polymers 0.000 description 2
- 239000000779 smoke Substances 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
- 239000004094 surface-active agent Substances 0.000 description 2
- OWWIWYDDISJUMY-UHFFFAOYSA-N 2,3-dimethylbut-1-ene Chemical compound CC(C)C(C)=C OWWIWYDDISJUMY-UHFFFAOYSA-N 0.000 description 1
- MHNNAWXXUZQSNM-UHFFFAOYSA-N 2-methylbut-1-ene Chemical compound CCC(C)=C MHNNAWXXUZQSNM-UHFFFAOYSA-N 0.000 description 1
- BWEKDYGHDCHWEN-UHFFFAOYSA-N 2-methylhex-2-ene Chemical compound CCCC=C(C)C BWEKDYGHDCHWEN-UHFFFAOYSA-N 0.000 description 1
- YHQXBTXEYZIYOV-UHFFFAOYSA-N 3-methylbut-1-ene Chemical compound CC(C)C=C YHQXBTXEYZIYOV-UHFFFAOYSA-N 0.000 description 1
- RYKZRKKEYSRDNF-UHFFFAOYSA-N 3-methylidenepentane Chemical compound CCC(=C)CC RYKZRKKEYSRDNF-UHFFFAOYSA-N 0.000 description 1
- LDTAOIUHUHHCMU-UHFFFAOYSA-N 3-methylpent-1-ene Chemical compound CCC(C)C=C LDTAOIUHUHHCMU-UHFFFAOYSA-N 0.000 description 1
- KLCNJIQZXOQYTE-UHFFFAOYSA-N 4,4-dimethylpent-1-ene Chemical compound CC(C)(C)CC=C KLCNJIQZXOQYTE-UHFFFAOYSA-N 0.000 description 1
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004952 Polyamide Substances 0.000 description 1
- 239000011954 Ziegler–Natta catalyst Substances 0.000 description 1
- 150000001336 alkenes Chemical group 0.000 description 1
- 239000000470 constituent Substances 0.000 description 1
- 238000005034 decoration Methods 0.000 description 1
- 239000000428 dust Substances 0.000 description 1
- 238000011156 evaluation Methods 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 239000000835 fiber Substances 0.000 description 1
- 238000007306 functionalization reaction Methods 0.000 description 1
- OTTZHAVKAVGASB-UHFFFAOYSA-N hept-2-ene Chemical compound CCCCC=CC OTTZHAVKAVGASB-UHFFFAOYSA-N 0.000 description 1
- WZHKDGJSXCTSCK-UHFFFAOYSA-N hept-3-ene Chemical compound CCCC=CCC WZHKDGJSXCTSCK-UHFFFAOYSA-N 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 238000004898 kneading Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000012968 metallocene catalyst Substances 0.000 description 1
- 238000006386 neutralization reaction Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 229920002647 polyamide Polymers 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 230000000630 rising effect Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
Abstract
Description
【0001】
【発明の属する技術分野】
本発明は、多層二軸延伸ポリプロピレンフィルムに関する。詳しくは、透明性及び剛性に優れ、半永久的な帯電防止性を有する多層二軸延伸ポリプロピレンフィルムに関する。
【0002】
【従来の技術】
二軸延伸ポリプロピレンフィルムは、透明性、光沢等の光学的特性、引張強度、剛性等の機械的特性、防湿性等が優れているため、食品包装用途、繊維包装用途等の広範囲な用途に使用されている。
しかし、二軸延伸ポリプロピレンフィルムは静電気を帯び易く、フィルム表面への埃の付着や印刷時のインク着肉不良が起こり易いという問題がある。静電気の発生を防止する方法としては、フィルムの原料となるポリプロピレン樹脂に界面活性剤等の帯電防止剤を配合する方法が従来から知られている。
【0003】
しかし、このような帯電防止剤は、二軸延伸ポリプロピレンフィルムの製膜時に、発煙やロール汚れをもたらすことがある。製膜時の発煙やロール汚れを防止する方法として、帯電防止剤を含有するポリプロピレンフィルムの少なくとも片面に、実質的に帯電防止剤を含有しないポリプロピレンフィルムを積層した多層二軸延伸ポリプロピレンフィルムが知られている(例えば、特許文献1参照)。しかし、このような多層二軸延伸ポリプロピレンフィルムは、帯電防止剤がフィルム表面に移行するまでの間、効果が発現しないという問題を有している。
更に、帯電防止剤がフィルム表面に移行することによって、帯電防止効果を発現させることから、フィルム同士の摩擦等により界面活性剤が喪失すると、帯電防止効果が低下したり、喪失したりするため、帯電防止効果が持続しないという問題も有している。
【0004】
【特許文献1】
特開平5−104688号公報
【0005】
【発明が解決しようとする課題】
本発明の課題は、透明性、剛性及び帯電防止性のバランスに優れ、半永久的な帯電防止性を有する多層二軸延伸ポリプロピレンフィルムを提供することである。
【0006】
【課題を解決するための手段】
本発明者等は、上記の課題を解決するため鋭意研究した。その結果、基材層とその少なくとも片面に積層された表層とからなる多層二軸延伸ポリプロピレンフィルムであって、基材層は特定のポリプロピレン樹脂(A)からなり、表層は特定のポリプロピレン樹脂(B)に高分子帯電防止剤を5〜20重量%添加した組成物からなり、表層の厚さが1層について基材層の厚さの1〜20%である多層二軸延伸ポリプロピレンフィルムが前記課題を解決することを知り、その知見に基づいて本発明を完成させるに至った。
【0007】
本発明は以下によって構成される。
(1)基材層とその少なくとも片面に積層された表層とからなる多層二軸延伸ポリプロピレンフィルムであって、基材層が下記ポリプロピレン樹脂(A)からなり、表層が下記ポリプロピレン樹脂(B)に高分子帯電防止剤を表層の重量基準で5〜20重量%を添加した組成物からなり、表層の厚さが1層について基材層の厚さの1〜20%であることを特徴とする多層二軸延伸ポリプロピレンフィルム。
ポリプロピレン樹脂(A):
MFRが1〜7g/10分であるプロピレン単独重合体、及び/またはDSCの融解ピークから求めた融点Tmが155℃以上であるプロピレン系ランダム共重合体。
ポリプロピレン樹脂(B):
MFRが3〜20g/10分であり、DSCの融解ピークから求めた融点Tmがポリプロピレン樹脂(A)のそれよりも5〜25℃低いプロピレン系ランダム共重合体。
【0008】
(2)高分子帯電防止剤が、ポリエーテル−ブロック−コポリアミド、ポリエーテルエステルアミド、ポリアルキレングリコール部分を含む熱可塑性ポリウレタンから選ばれた1種以上であることを特徴とする前記(1)項記載の多層二軸延伸ポリプロピレンフィルム。
【0009】
【発明の実施の形態】
本発明の多層二軸延伸ポリプロピレンフィルムは、基材層とその少なくとも片面に積層された表層とからなり、両層はポリプロピレン樹脂からなり、表層を構成する樹脂には高分子帯電防止剤が添加される。
基材層に用いられるポリプロピレン樹脂(A)は、プロピレン単独重合体、DSCの融解ピークから求めた融点Tmが155℃以上のプロピレン系ランダム共重合体、及びこれらの重合体の混合物から選ばれる。
プロピレン単独重合体とは、プロピレン単位のみの重合体であり、プロピレン系ランダム共重合体とは、プロピレン単位とエチレン及び炭素数4〜10個を有するα−オレフィンから選択された少なくとも1種のコモノマー単位とのプロピレン単位を主成分とするランダム共重合体である。尚、主成分とは最も多い成分を意味する。
【0010】
炭素数4〜10個を有するα−オレフィンとしては、例えば、1−ブテン、2−メチル−1−プロペン、1−ペンテン、2−メチル−1−ブテン、3−メチル−1−ブテン、1−ヘキセン、2−エチル−1−ブテン、2,3−ジメチル−1−ブテン、2−メチル−1−ペンテン、3−メチル−1−ペンテン、4−メチル−1−ペンテン、3,3−ジメチル−1−ブテン、1−ヘプテン、メチル−1−ヘキセン、ジメチル−1−ペンテン、エチル−1−ペンテン、トリメチル−1−ブテン、1−オクテン等が挙げられ、好ましくは1−ブテン、1−ペンテン、1−ヘキセン、1−オクテンであり、より好ましくは、1−ブテン、1−ヘキセンである。
【0011】
プロピレン系ランダム共重合体としては、プロピレン−エチレンランダム共重合体、プロピレン−α−オレフィンランダム共重合体、プロピレン−エチレン−α−オレフィンランダム共重合体等が挙げられる。
プロピレン−α−オレフィンランダム共重合体としては、プロピレン−1−ブテンランダム共重合体、プロピレン−1−ヘキセンランダム共重合体等が挙げられ、プロピレン−エチレン−α−オレフィンランダム共重合体としては、プロピレン−エチレン−1−ブテンランダム共重合体、プロピレン−エチレン−1−ヘキセンランダム共重合体等が挙げられる。プロピレン系ランダム共重合体として好ましくは、プロピレン−エチレンランダム共重合体、プロピレン−1−ブテンランダム共重合体、プロピレン−エチレン−1−ブテンランダム共重合体である。
ポリプロピレン樹脂(A)がプロピレン系ランダム共重合体である場合、剛性、熱収縮性等のバランスの観点から、融点Tmが155℃以上、好ましくは157℃以上である。
【0012】
ポリプロピレン樹脂(A)のMFRは、1〜7g/10分であり、好ましくは、2〜5g/10分である。MFRがこの範囲内であれば、押出加工時の流動性も、ニ軸延伸時の延伸性も十分である。
ポリプロピレン樹脂(A)の製造方法は、特に制限されるものではないが、チーグラーナッタ触媒を用いる方法またはメタロセン触媒を用いる方法が挙げられる。
【0013】
表層に用いられるポリプロピレン樹脂(B)は、プロピレン系ランダム共重合体である。プロピレン系ランダム共重合体を構成するオレフィン単位やその組成割合等は、前述したポリプロピレン樹脂(A)に用いられるプロピレン系ランダム共重合体と同じものが挙げられる。
ポリプロピレン樹脂(B)に用いられるプロピレン系ランダム共重合体は、DSCの融解ピークから求めた融点が、ポリプロピレン樹脂(A)のDSCの融解ピークから求めた融点よりも5〜25℃低温であり、好ましくは、10〜20℃低温である。ポリプロピレン樹脂(A)とポリプロピレン樹脂(B)のDSCの融解ピークから求めた融点の差が上記の範囲内であれば、高分子帯電防止剤の導電性回路が切断されて帯電防止性能が不十分になることもなく、高分子帯電防止剤の延伸も十分で、優れた帯電防止性能が得られる。
【0014】
ポリプロピレン樹脂(B)のプロピレン系ランダム共重合体のMFRは、3〜20g/10分であり、好ましくは、5〜15g/10分である。MFRがこの範囲内であれば、添加された高分子帯電防止剤の導電性回路が切断されて帯電防止性能が不十分になることがなく、添加された高分子帯電防止剤の延伸が不十分で帯電防止性能が不十分になることもない。
ポリプロピレン樹脂(B)の製造方法は、特に制限されるものではなく、ポリプロピレン樹脂(A)と同様の方法が挙げられる。
【0015】
本発明において、表層の組成物に用いられる高分子帯電防止剤は、そのMFR(JIS K 7210に準拠し、230℃、荷重21.18Nで測定。)が100g/10分以下、好ましくは5〜50g/10分で、帯電防止性能を有し、溶融加工できるものであれば、特に制限されるものではない。かかる高分子帯電防止剤としては、例えば、高濃度のポリエーテルブロックを含む種々の高分子物質が挙げられる。これらはイオン導電性ポリマーと呼ばれ、ポリエーテルに沿ったイオン導電により、108〜1013Ωの表面抵抗率を生じる。このようなイオン導電性ポリマーの例としては、ポリエーテル−ブロック−コポリアミド、ポリエーテルエステルアミド、ポリアルキレングリコール部分を含む熱可塑性ポリウレタン等が挙げられる。これらは単独使用でも、2種以上の併用でもよい。
表層の組成物においては、ポリプロピレン樹脂(B)に高分子帯電防止剤が表層の重量基準で5〜20重量%添加される。高分子帯電防止剤の添加量がこの範囲内であれば、帯電防止性能が十分で、製造コストの増加も少ない。
【0016】
本発明において、表層の組成物に高分子帯電防止剤を配合する方法は、特に制限されるものではなく、表層に用いられるポリプロピレン樹脂(B)に高分子帯電防止剤を均一に分散させることができる公知の方法が挙げられる。例えば、リボンブレンダー、ヘンシェルミキサー(商品名)、タンブラーミキサー等で混合し、その混合物を押出機で溶融混練する方法が挙げられる。また、ポリプロピレン樹脂(B)には、高分子帯電防止剤を配合する際に、必要に応じて、公知の酸化防止剤、中和剤、滑剤、アンチブロッキング剤、改質用樹脂等を、必要に応じて、本発明の効果を損なわない範囲で適宜配合することができる。
また、基材層に用いられるポリプロピレン樹脂(A)に対しても、必要に応じて、公知の酸化防止剤、中和剤、滑剤、アンチブロッキング剤、改質用樹脂等を、必要に応じて、本発明の効果を損なわない範囲で適宜配合することができる。
【0017】
本発明の多層二軸延伸ポリプロピレンフィルムの製膜、延伸加工方法には、特に制限はなく、例えば、逐次二軸延伸方式、同時二軸延伸方式、チューブラー二軸延伸方式等が挙げられる。
本発明の多層二軸延伸ポリプロピレンフィルムの多層化方法には、特に制限はないが、通常、共通ダイ(多層ダイ)を用いて基材層と表層を共押出する方法が用いられるが、逐次二軸延伸方法では、縦延伸後の一軸延伸フィルムに、表層の組成物を積層してもよい。
【0018】
本発明の多層二軸延伸ポリプロピレンフィルムの厚さには、特に制限はないが、通常150μm以下であり、好ましくは10〜100μmであり、より好ましくは15〜80μmである。
本発明の多層二軸延伸ポリプロピレンフィルムの表層の厚さは1層について、基材層の厚さの1〜20%である。表層の厚さがこの範囲内であれば、得られる多層二軸延伸ポリプロピレンフィルムの帯電防止性能が十分であり、透明性の低下もない。
【0019】
本発明の多層二軸延伸ポリプロピレンフィルムには、必要に応じて、印刷等の加飾処理を施すことができる。また、片面にのみ表層を形成する場合は、表層のない面に、他のフィルムを積層して機能化を図ることも可能である。
本発明の多層二軸延伸ポリプロピレンフィルムは、透明性、剛性及び帯電防止性のバランスに優れ、半永久的な帯電防止性を有するため、食品包装用途、繊維包装用途等の広範囲な用途に使用することができる。
【0020】
【実施例】
以下、実施例及び比較例により本発明を詳細に説明するが、本発明は、以下の実施例に限定されるものではない。
実施例及び比較例において、フィルムまたはその構成成分についての諸物性は、以下の評価方法に従って測定した。
【0021】
[1]MFR(単位:g/10分)
JIS K 7210に準拠して、230℃、荷重21.18Nで測定した。
[2]融点(Tm、単位:℃)
示差走査型熱量計(パーキンエルマー社製DSC−7)を用い、樹脂を230℃で3分間熱処理後、降温速度30℃/分で−20℃まで冷却して−20℃において5分間保温し、更に20℃から230℃まで昇温速度20℃/分で加熱した際の融解ピーク温度を融点として求めた。
[3]表面抵抗率(単位:Ω)
恒温恒湿室(23℃、湿度50%)で表面固有抵抗計(ULTRA HIGHRESISTANCE METER R8340A(商品名)、アドバンテスト社製)により、表面抵抗率を測定した。測定は、フィルムを製膜後恒温恒湿室に3日間放置した後、1試料につき3回測定し、その平均値を求めた。
[4]透明性(単位:%)
JIS K 7105に準拠して、フィルム1枚のヘーズを測定した。
【0022】
実施例1
(1−1)基材層に用いたポリプロピレン樹脂(A):
MFRが3g/10分、融点Tmが162℃のプロピレン単独重合体のパウダーに、酸化防止剤Irganox1010(商品名、チバスペシャルティケミカルズ社製)0.1重量%、酸化防止剤Irgfos168(商品名、チバスペシャルティケミカルズ社製)0.1重量%及び中和剤としてステアリン酸カルシウム0.1重量%をヘンシェルミキサー(商品名)で混合した後、押出機で造粒し、ペレット化した。
【0023】
(1−2)表層に用いたポリプロピレン樹脂(B)及び組成物:
MFRが8g/10分、融点Tmが148℃のプロピレン−エチレンランダム共重合体のパウダーに、高分子帯電防止剤Irgastat P18(商品名、ポリアミド/ポリエーテル−ブロック−コポリアミド主成分、MFR=17〜21g/10分(230℃、荷重21.18N)、チバスペシャルティケミカルズ社製)15重量%、酸化防止剤Irganox1010を0.1重量%、酸化防止剤Irgfos168を0.1重量%、及び中和剤としてステアリン酸カルシウムを0.1重量%加え、ヘンシェルミキサーで混合した後、押出機で造粒し、ペレット化した。
【0024】
(1−3)多層二軸延伸フィルムの製膜:
上記(1−1)で得られた基材層ポリプロピレンペレット及び(1−2)で得られた表層ポリプロピレンペレットをそれぞれ別の押出機で溶融混錬し、樹脂温度250℃で1基の共押出Tダイに供給した。このダイから、表層/基材層の2種2層構成として押出された樹脂を25℃の冷却ロールにて急冷、固化することにより、原反シートを得た。また、原反シートの表層厚さは、基材層の10%となるように調整した。次いで、この原反シートを、予熱後、縦延伸機のロール周速差により延伸温度125℃で縦方向に5倍延伸し、引き続きテンターにて延伸温度162℃で横方向に9倍延伸し、170℃で熱処理を行い、厚さ25μmの多層二軸延伸フィルムを得た。得られたフィルムの物性を表2に示した。
【0025】
実施例2
(2−1)基材層に用いたポリプロピレン樹脂(A):
MFRが3g/10分、融点Tmが158℃のプロピレン−エチレンランダム共重合体のパウダーに、酸化防止剤Irganox1010を0.1重量%、酸化防止剤Irgfos168を0.1重量%、及び中和剤としてステアリン酸カルシウムを0.1重量%加え、ヘンシェルミキサーで混合した後、押出機で造粒し、ペレット化した。
【0026】
(2−2)表層に用いたポリプロピレン樹脂(B)及び組成物:
MFRが7g/10分、融点Tmが137℃のプロピレン−エチレン−1−ブテンランダム共重合体のパウダーに、高分子帯電防止剤Irgastat P18を15重量%、酸化防止剤Irganox1010を0.1重量%、酸化防止剤Irgfos168を0.1重量%、及び中和剤としてステアリン酸カルシウムを0.1重量%加え、ヘンシェルミキサーで混合した後、押出機で造粒し、ペレット化した。
【0027】
(2−3)多層二軸延伸フィルムの製膜:
上記(2−1)で得られた基材層ポリプロピレンペレット及び(2−2)で得られた表層ポリプロピレンペレットをそれぞれ別の押出機で溶融混錬し、樹脂温度250℃で1基の共押出Tダイに供給した。その他の加工条件は、実施例1と同様に行った。得られたフィルムの物性を表2に示した。
【0028】
実施例3
(3−1)基材層に用いたポリプロピレン樹脂(A):
実施例2で使用した基材層ポリプロピレンペレットを使用した。
(3−2)表層に用いたポリプロピレン樹脂(B)及び組成物:
実施例1で使用した表層ポリプロピレンペレットを使用した。
(3−3)多層二軸延伸フィルムの製膜:
上記(3−1)で得られた基材層ポリプロピレンペレット及び(3−2)で得られた表層ポリプロピレンペレットをそれぞれ別の押出機で溶融混錬し、樹脂温度250℃で1基の共押出Tダイに供給した。その他の加工条件は、実施例1と同様に行った。得られたフィルムの物性を表2に示した。
【0029】
比較例1
(1−1)基材層に用いたポリプロピレン樹脂(A):
実施例1で使用した基材層ポリプロピレンペレットを使用した。
(1−2)表層に用いたポリプロピレン樹脂(B)及び組成物:
MFRが8g/10分、融点Tmが148℃のプロピレン−エチレンランダム共重合体のパウダーに、高分子帯電防止剤Irgastat P18を30重量%、酸化防止剤Irganox1010を0.1重量%、酸化防止剤Irgfos168を0.1重量%、及び中和剤としてステアリン酸カルシウムを0.1重量%加え、ヘンシェルミキサーで混合した後、押出機で造粒し、ペレット化した。
(1−3)多層二軸延伸フィルムの製膜:
上記(1−1)で得られた基材層ポリプロピレンペレット及び(1−2)で得られた表層ポリプロピレンペレットをそれぞれ別の押出機で溶融混錬し、樹脂温度250℃で1基の共押出Tダイに供給した。その他の加工条件は、実施例1と同様に行った。得られたフィルムの物性を表2に示した。
【0030】
比較例2
(2−1)基材層に用いたポリプロピレン樹脂(A):
実施例1で使用した基材層ポリプロピレンペレットを使用した。
(2−2)表層に用いたポリプロピレン樹脂(B)及び組成物:
MFRが4g/10分、融点Tmが162℃のプロピレン単独重合体のパウダーに、高分子帯電防止剤Irgastat P18を15重量%、酸化防止剤Irganox1010を0.1重量%、酸化防止剤Irgfos168を0.1重量%、及び中和剤としてステアリン酸カルシウムを0.1重量%加え、ヘンシェルミキサーで混合した後、押出機で造粒し、ペレット化した。
(2−3)多層二軸延伸フィルムの製膜:
上記(2−1)で得られた基材層ポリプロピレンペレット及び(2−2)で得られた表層ポリプロピレンペレットをそれぞれ別の押出機で溶融混錬し、樹脂温度250℃で1基の共押出Tダイに供給した。その他の加工条件は、実施例1と同様に行った。得られたフィルムの物性を表2に示した。
【0031】
比較例3
(3−1)基材層に用いたポリプロピレン:
実施例1で使用した基材層ポリプロピレンペレットを使用した。
(3−2)表層に用いたポリプロピレン樹脂(B)及び組成物:
MFRが5g/10分、融点Tmが125℃のプロピレン−エチレン−1−ブテンランダム共重合体のパウダーに、高分子帯電防止剤Irgastat P18を15重量%、酸化防止剤Irganox1010を0.1重量%、酸化防止剤Irgfos168を0.1重量%、及び中和剤としてステアリン酸カルシウムを0.1重量%加え、ヘンシェルミキサーで混合した後、押出機で造粒し、ペレット化した。
(3−3)多層二軸延伸フィルムの製膜:
上記(3−1)で得られた基材層ポリプロピレンペレット及び(3−2)で得られた表層ポリプロピレンペレットをそれぞれ別の押出機で溶融混錬し、樹脂温度250℃で1基の共押出Tダイに供給した。その他の加工条件は、実施例1と同様に行った。得られたフィルムの物性を表2に示した。
【0032】
【発明の効果】
本発明の多層二軸延伸ポリプロピレンフィルムは、高分子帯電防止剤を含有する表層用のポリプロピレン樹脂と、基材層用のポリプロピレン樹脂として、DSCの融解ピークから求めた融点(Tm)が、特定の関係を満足するポリプロピレン樹脂を用いて、積層することによって、透明性、剛性及び帯電防止性のバランスに優れ、半永久的な帯電防止効果を有している。
【0033】
【表1】
【0034】
【表2】
[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a multilayer biaxially oriented polypropylene film. Specifically, the present invention relates to a multilayer biaxially stretched polypropylene film having excellent transparency and rigidity and having semi-permanent antistatic properties.
[0002]
[Prior art]
Biaxially stretched polypropylene film has excellent optical properties such as transparency and gloss, mechanical properties such as tensile strength and rigidity, and moisture resistance, so it can be used in a wide range of applications such as food packaging and textile packaging. Has been.
However, the biaxially stretched polypropylene film is easily charged with static electricity, and there is a problem in that dust adheres to the film surface and ink imperfection is liable to occur during printing. As a method for preventing the generation of static electricity, a method in which an antistatic agent such as a surfactant is blended with a polypropylene resin as a raw material of a film has been conventionally known.
[0003]
However, such an antistatic agent may cause smoke generation or roll contamination when the biaxially stretched polypropylene film is formed. A multilayer biaxially oriented polypropylene film in which a polypropylene film containing substantially no antistatic agent is laminated on at least one side of a polypropylene film containing an antistatic agent is known as a method for preventing smoke and roll contamination during film formation. (For example, refer to Patent Document 1). However, such a multilayer biaxially stretched polypropylene film has a problem that the effect is not exhibited until the antistatic agent is transferred to the film surface.
Furthermore, since the antistatic agent develops an antistatic effect by transferring to the film surface, when the surfactant is lost due to friction between the films, the antistatic effect is reduced or lost, There is also a problem that the antistatic effect does not last.
[0004]
[Patent Document 1]
Japanese Patent Laid-Open No. 5-104688
[Problems to be solved by the invention]
The subject of this invention is providing the multilayer biaxially-stretched polypropylene film which is excellent in the balance of transparency, rigidity, and antistatic property, and has semipermanent antistatic property.
[0006]
[Means for Solving the Problems]
The present inventors have intensively studied to solve the above problems. As a result, a multilayer biaxially stretched polypropylene film comprising a base material layer and a surface layer laminated on at least one surface thereof, the base material layer is made of a specific polypropylene resin (A), and the surface layer is a specific polypropylene resin (B And a multilayer biaxially stretched polypropylene film having a surface layer thickness of 1 to 20% of the thickness of the base material layer per layer. The present invention has been completed based on the knowledge.
[0007]
The present invention is constituted by the following.
(1) A multilayer biaxially stretched polypropylene film comprising a base material layer and a surface layer laminated on at least one surface thereof, the base material layer comprising the following polypropylene resin (A), and the surface layer comprising the following polypropylene resin (B) It consists of a composition in which 5 to 20% by weight of a polymer antistatic agent is added based on the weight of the surface layer, and the thickness of the surface layer is 1 to 20% of the thickness of the base material layer per layer. Multilayer biaxially oriented polypropylene film.
Polypropylene resin (A):
A propylene homopolymer having an MFR of 1 to 7 g / 10 min, and / or a propylene random copolymer having a melting point Tm determined from a melting peak of DSC of 155 ° C. or higher.
Polypropylene resin (B):
A propylene-based random copolymer having an MFR of 3 to 20 g / 10 min and a melting point Tm determined from a melting peak of DSC of 5 to 25 ° C. lower than that of the polypropylene resin (A).
[0008]
(2) The above-mentioned (1), wherein the polymer antistatic agent is at least one selected from polyether-block-copolyamide, polyetheresteramide, and thermoplastic polyurethane containing a polyalkylene glycol moiety. The multilayer biaxially stretched polypropylene film according to Item.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
The multilayer biaxially stretched polypropylene film of the present invention comprises a base material layer and a surface layer laminated on at least one surface thereof, both layers are composed of a polypropylene resin, and a polymer antistatic agent is added to the resin constituting the surface layer. The
The polypropylene resin (A) used for the base material layer is selected from a propylene homopolymer, a propylene random copolymer having a melting point Tm determined from a melting peak of DSC of 155 ° C. or higher, and a mixture of these polymers.
The propylene homopolymer is a polymer having only propylene units, and the propylene random copolymer is at least one comonomer selected from propylene units, ethylene, and α-olefin having 4 to 10 carbon atoms. It is a random copolymer mainly composed of propylene units. The main component means the most abundant component.
[0010]
Examples of the α-olefin having 4 to 10 carbon atoms include 1-butene, 2-methyl-1-propene, 1-pentene, 2-methyl-1-butene, 3-methyl-1-butene, 1-butene, Hexene, 2-ethyl-1-butene, 2,3-dimethyl-1-butene, 2-methyl-1-pentene, 3-methyl-1-pentene, 4-methyl-1-pentene, 3,3-dimethyl- Examples include 1-butene, 1-heptene, methyl-1-hexene, dimethyl-1-pentene, ethyl-1-pentene, trimethyl-1-butene, 1-octene, and the like, preferably 1-butene, 1-pentene, 1-hexene and 1-octene are preferable, and 1-butene and 1-hexene are more preferable.
[0011]
Examples of the propylene random copolymer include a propylene-ethylene random copolymer, a propylene-α-olefin random copolymer, and a propylene-ethylene-α-olefin random copolymer.
Examples of the propylene-α-olefin random copolymer include propylene-1-butene random copolymer, propylene-1-hexene random copolymer, and the like, as propylene-ethylene-α-olefin random copolymer, A propylene-ethylene-1-butene random copolymer, a propylene-ethylene-1-hexene random copolymer, etc. are mentioned. The propylene random copolymer is preferably a propylene-ethylene random copolymer, a propylene-1-butene random copolymer, or a propylene-ethylene-1-butene random copolymer.
When the polypropylene resin (A) is a propylene random copolymer, the melting point Tm is 155 ° C. or higher, preferably 157 ° C. or higher, from the viewpoint of balance such as rigidity and heat shrinkability.
[0012]
The MFR of the polypropylene resin (A) is 1 to 7 g / 10 minutes, and preferably 2 to 5 g / 10 minutes. When the MFR is within this range, the fluidity during extrusion and the stretchability during biaxial stretching are sufficient.
The method for producing the polypropylene resin (A) is not particularly limited, and examples thereof include a method using a Ziegler-Natta catalyst and a method using a metallocene catalyst.
[0013]
The polypropylene resin (B) used for the surface layer is a propylene random copolymer. Examples of the olefin unit constituting the propylene random copolymer, the composition ratio thereof, and the like are the same as those of the propylene random copolymer used in the polypropylene resin (A) described above.
In the propylene random copolymer used for the polypropylene resin (B), the melting point determined from the DSC melting peak is 5 to 25 ° C. lower than the melting point determined from the DSC melting peak of the polypropylene resin (A), Preferably, it is 10-20 degreeC low temperature. If the difference in melting point obtained from the DSC melting peak of the polypropylene resin (A) and the polypropylene resin (B) is within the above range, the conductive circuit of the polymer antistatic agent is cut and the antistatic performance is insufficient. The polymer antistatic agent is sufficiently stretched, and excellent antistatic performance can be obtained.
[0014]
The MFR of the propylene random copolymer of the polypropylene resin (B) is 3 to 20 g / 10 minutes, and preferably 5 to 15 g / 10 minutes. When the MFR is within this range, the conductive circuit of the added polymer antistatic agent is not cut and the antistatic performance is not insufficient, and the added polymer antistatic agent is not sufficiently stretched. Therefore, the antistatic performance is not insufficient.
The manufacturing method of a polypropylene resin (B) is not specifically limited, The method similar to a polypropylene resin (A) is mentioned.
[0015]
In the present invention, the polymer antistatic agent used in the composition of the surface layer has an MFR (measured in accordance with JIS K 7210 at 230 ° C. and a load of 21.18 N) of 100 g / 10 minutes or less, preferably 5 to 5 minutes. There is no particular limitation as long as it has antistatic performance at 50 g / 10 min and can be melt processed. Examples of such a polymer antistatic agent include various polymer substances containing a high concentration polyether block. These are called ionic conductive polymers and produce surface resistivity of 10 8 to 10 13 Ω by ionic conduction along the polyether. Examples of such ion conductive polymers include polyether-block-copolyamides, polyether ester amides, thermoplastic polyurethanes containing polyalkylene glycol moieties, and the like. These may be used alone or in combination of two or more.
In the composition of the surface layer, the polymer antistatic agent is added to the polypropylene resin (B) in an amount of 5 to 20% by weight based on the weight of the surface layer. When the addition amount of the polymer antistatic agent is within this range, the antistatic performance is sufficient and the production cost is not increased.
[0016]
In the present invention, the method of blending the polymer antistatic agent with the surface layer composition is not particularly limited, and the polymer antistatic agent can be uniformly dispersed in the polypropylene resin (B) used for the surface layer. The publicly known method which can be mentioned is mentioned. Examples thereof include a method of mixing with a ribbon blender, a Henschel mixer (trade name), a tumbler mixer, and the like, and melt-kneading the mixture with an extruder. In addition, the polypropylene resin (B) needs a known antioxidant, neutralizing agent, lubricant, anti-blocking agent, modifying resin, etc., if necessary, when blended with a polymer antistatic agent. Depending on the case, it can be blended appropriately within a range not impairing the effects of the present invention.
Also, for the polypropylene resin (A) used for the base material layer, a known antioxidant, neutralizing agent, lubricant, anti-blocking agent, modifying resin, etc., as necessary , And can be appropriately blended within a range not impairing the effects of the present invention.
[0017]
There is no restriction | limiting in particular in the film forming of the multilayer biaxially stretched polypropylene film of this invention, and a extending | stretching processing method, For example, a sequential biaxial stretching system, a simultaneous biaxial stretching system, a tubular biaxial stretching system etc. are mentioned.
There are no particular restrictions on the method of multilayering the multilayer biaxially oriented polypropylene film of the present invention, but usually a method of coextruding the substrate layer and the surface layer using a common die (multilayer die) is used. In the axial stretching method, the surface layer composition may be laminated on a uniaxially stretched film after longitudinal stretching.
[0018]
Although there is no restriction | limiting in particular in the thickness of the multilayer biaxially stretched polypropylene film of this invention, Usually, it is 150 micrometers or less, Preferably it is 10-100 micrometers, More preferably, it is 15-80 micrometers.
The thickness of the surface layer of the multilayer biaxially stretched polypropylene film of the present invention is 1 to 20% of the thickness of the base material layer for one layer. When the thickness of the surface layer is within this range, the resulting multilayer biaxially stretched polypropylene film has sufficient antistatic performance, and there is no decrease in transparency.
[0019]
The multilayer biaxially stretched polypropylene film of the present invention can be subjected to a decoration treatment such as printing, if necessary. Moreover, when forming a surface layer only on one side, it is also possible to achieve functionalization by laminating another film on a surface having no surface layer.
The multilayer biaxially stretched polypropylene film of the present invention is excellent in the balance of transparency, rigidity and antistatic property and has a semi-permanent antistatic property, so it can be used for a wide range of applications such as food packaging applications and fiber packaging applications. Can do.
[0020]
【Example】
EXAMPLES Hereinafter, although an Example and a comparative example demonstrate this invention in detail, this invention is not limited to a following example.
In the examples and comparative examples, various physical properties of the film or its constituent components were measured according to the following evaluation methods.
[0021]
[1] MFR (unit: g / 10 minutes)
Based on JIS K7210, it measured by 230 degreeC and the load 21.18N.
[2] Melting point (Tm, unit: ° C)
Using a differential scanning calorimeter (DSC-7 manufactured by Perkin Elmer), the resin was heat-treated at 230 ° C. for 3 minutes, then cooled to −20 ° C. at a temperature-decreasing rate of 30 ° C./min, and kept at −20 ° C. for 5 minutes. Furthermore, the melting peak temperature when heating from 20 ° C. to 230 ° C. at a temperature rising rate of 20 ° C./min was determined as the melting point.
[3] Surface resistivity (unit: Ω)
The surface resistivity was measured with a surface resistivity meter (ULTRA HIGHRESISTANCE METER R8340A (trade name), manufactured by Advantest) in a constant temperature and humidity chamber (23 ° C., humidity 50%). The measurement was carried out after the film was formed and left in a constant temperature and humidity chamber for 3 days, and then measured three times for each sample to obtain an average value.
[4] Transparency (unit:%)
The haze of one film was measured according to JIS K 7105.
[0022]
Example 1
(1-1) Polypropylene resin (A) used for the base material layer:
Propylene homopolymer powder having an MFR of 3 g / 10 min and a melting point Tm of 162 ° C., 0.1% by weight of an antioxidant Irganox 1010 (trade name, manufactured by Ciba Specialty Chemicals), an antioxidant Irgfos 168 (trade name, Ciba) (Specialty Chemicals Co., Ltd.) 0.1 wt% and calcium stearate 0.1 wt% as a neutralizing agent were mixed with a Henschel mixer (trade name), granulated with an extruder, and pelletized.
[0023]
(1-2) Polypropylene resin (B) and composition used for the surface layer:
A propylene-ethylene random copolymer powder having an MFR of 8 g / 10 min and a melting point Tm of 148 ° C. was added to a polymer antistatic agent Irgastat P18 (trade name, polyamide / polyether-block-copolyamide main component, MFR = 17 -21 g / 10 min (230 ° C., load 21.18 N), Ciba Specialty Chemicals 15% by weight, antioxidant Irganox 1010 0.1% by weight, antioxidant Irgfos 168 0.1% by weight, and neutralization After adding 0.1% by weight of calcium stearate as an agent and mixing with a Henschel mixer, the mixture was granulated with an extruder and pelletized.
[0024]
(1-3) Formation of a multilayer biaxially stretched film:
The base layer polypropylene pellets obtained in (1-1) above and the surface layer polypropylene pellets obtained in (1-2) were melt-kneaded with separate extruders, and one coextrusion at a resin temperature of 250 ° C. Supplied to a T-die. A raw sheet was obtained from this die by rapidly cooling and solidifying the resin extruded as a two-layer / two-layer structure of surface layer / base material layer with a cooling roll at 25 ° C. Moreover, the surface layer thickness of the original fabric sheet was adjusted to be 10% of the base material layer. Next, after preheating, the raw sheet is stretched 5 times in the longitudinal direction at a stretching temperature of 125 ° C. due to the difference in the peripheral speed of the longitudinal stretching machine, and subsequently stretched 9 times in the transverse direction at a stretching temperature of 162 ° C. by a tenter. Heat treatment was performed at 170 ° C. to obtain a multilayer biaxially stretched film having a thickness of 25 μm. The physical properties of the obtained film are shown in Table 2.
[0025]
Example 2
(2-1) Polypropylene resin (A) used for the base material layer:
Propylene-ethylene random copolymer powder having an MFR of 3 g / 10 min and a melting point Tm of 158 ° C., 0.1% by weight of the antioxidant Irganox 1010, 0.1% by weight of the antioxidant Irgfos 168, and a neutralizing agent After adding 0.1% by weight of calcium stearate and mixing with a Henschel mixer, the mixture was granulated with an extruder and pelletized.
[0026]
(2-2) Polypropylene resin (B) and composition used for the surface layer:
A propylene-ethylene-1-butene random copolymer powder having an MFR of 7 g / 10 min and a melting point Tm of 137 ° C., 15 wt% of the polymer antistatic agent Irgastat P18, and 0.1 wt% of the antioxidant Irganox 1010 Then, 0.1 wt% of the antioxidant Irgfos 168 and 0.1 wt% of calcium stearate as a neutralizing agent were added, mixed with a Henschel mixer, granulated with an extruder, and pelletized.
[0027]
(2-3) Formation of multilayer biaxially stretched film:
The base layer polypropylene pellets obtained in (2-1) above and the surface layer polypropylene pellets obtained in (2-2) were melt-kneaded in separate extruders, and one coextrusion was carried out at a resin temperature of 250 ° C. Supplied to a T-die. Other processing conditions were the same as in Example 1. The physical properties of the obtained film are shown in Table 2.
[0028]
Example 3
(3-1) Polypropylene resin (A) used for the base material layer:
The base material layer polypropylene pellet used in Example 2 was used.
(3-2) Polypropylene resin (B) and composition used for the surface layer:
The surface layer polypropylene pellets used in Example 1 were used.
(3-3) Formation of multilayer biaxially stretched film:
The base layer polypropylene pellets obtained in (3-1) above and the surface layer polypropylene pellets obtained in (3-2) were melt-kneaded with separate extruders, and one coextrusion was carried out at a resin temperature of 250 ° C. Supplied to a T-die. Other processing conditions were the same as in Example 1. The physical properties of the obtained film are shown in Table 2.
[0029]
Comparative Example 1
(1-1) Polypropylene resin (A) used for the base material layer:
The base material layer polypropylene pellet used in Example 1 was used.
(1-2) Polypropylene resin (B) and composition used for the surface layer:
Propylene-ethylene random copolymer powder having an MFR of 8 g / 10 min and a melting point Tm of 148 ° C., 30% by weight of the polymer antistatic agent Irgastat P18, 0.1% by weight of the antioxidant Irganox 1010, and the antioxidant Irgfos 168 was added at 0.1% by weight, and calcium stearate as a neutralizing agent was added at 0.1% by weight. After mixing with a Henschel mixer, the mixture was granulated with an extruder and pelletized.
(1-3) Formation of a multilayer biaxially stretched film:
The base layer polypropylene pellets obtained in (1-1) above and the surface layer polypropylene pellets obtained in (1-2) were melt-kneaded with separate extruders, and one coextrusion at a resin temperature of 250 ° C. Supplied to a T-die. Other processing conditions were the same as in Example 1. The physical properties of the obtained film are shown in Table 2.
[0030]
Comparative Example 2
(2-1) Polypropylene resin (A) used for the base material layer:
The base material layer polypropylene pellet used in Example 1 was used.
(2-2) Polypropylene resin (B) and composition used for the surface layer:
A propylene homopolymer powder having an MFR of 4 g / 10 min and a melting point Tm of 162 ° C., 15% by weight of the polymer antistatic agent Irgastat P18, 0.1% by weight of the antioxidant Irganox 1010, and 0% of the antioxidant Irgfos168 0.1% by weight and 0.1% by weight of calcium stearate as a neutralizing agent were added, mixed with a Henschel mixer, granulated with an extruder, and pelletized.
(2-3) Formation of multilayer biaxially stretched film:
The base layer polypropylene pellets obtained in (2-1) above and the surface layer polypropylene pellets obtained in (2-2) were melt-kneaded in separate extruders, and one coextrusion was carried out at a resin temperature of 250 ° C. Supplied to a T-die. Other processing conditions were the same as in Example 1. The physical properties of the obtained film are shown in Table 2.
[0031]
Comparative Example 3
(3-1) Polypropylene used for the base material layer:
The base material layer polypropylene pellet used in Example 1 was used.
(3-2) Polypropylene resin (B) and composition used for the surface layer:
A propylene-ethylene-1-butene random copolymer powder having an MFR of 5 g / 10 min and a melting point Tm of 125 ° C., 15 wt% of the polymer antistatic agent Irgastat P18, and 0.1 wt% of the antioxidant Irganox 1010 Then, 0.1 wt% of the antioxidant Irgfos 168 and 0.1 wt% of calcium stearate as a neutralizing agent were added, mixed with a Henschel mixer, granulated with an extruder, and pelletized.
(3-3) Formation of multilayer biaxially stretched film:
The base layer polypropylene pellets obtained in (3-1) above and the surface layer polypropylene pellets obtained in (3-2) were melt-kneaded with separate extruders, and one coextrusion was carried out at a resin temperature of 250 ° C. Supplied to a T-die. Other processing conditions were the same as in Example 1. The physical properties of the obtained film are shown in Table 2.
[0032]
【The invention's effect】
The multilayer biaxially stretched polypropylene film of the present invention has a specific melting point (Tm) determined from a DSC melting peak as a surface layer polypropylene resin containing a polymer antistatic agent and a base layer polypropylene resin. By laminating using a polypropylene resin that satisfies the relationship, it has an excellent balance of transparency, rigidity and antistatic property and has a semi-permanent antistatic effect.
[0033]
[Table 1]
[0034]
[Table 2]
Claims (2)
ポリプロピレン樹脂(A):
メルトフローレート(JIS K 7210に準拠し、230℃、荷重21.18Nで測定。以下、MFRと略す。)が1〜7g/10分であるプロピレン単独重合体、及び/またはDSCの融解ピークから求めた融点Tmが155℃以上であるプロピレン系ランダム共重合体。
ポリプロピレン樹脂(B):
MFRが3〜20g/10分であり、DSCの融解ピークから求めた融点Tmがポリプロピレン樹脂(A)のそれよりも5〜25℃低いプロピレン系ランダム共重合体。A multilayer biaxially stretched polypropylene film comprising a base material layer and a surface layer laminated on at least one surface thereof, wherein the base material layer is made of the following polypropylene resin (A), and the surface layer is polymer charged to the following polypropylene resin (B). A multilayer biaxial, comprising a composition to which an inhibitor is added in an amount of 5 to 20% by weight based on the weight of the surface layer, wherein the thickness of the surface layer is 1 to 20% of the thickness of the base material layer per layer Stretched polypropylene film.
Polypropylene resin (A):
From a propylene homopolymer having a melt flow rate (according to JIS K 7210, measured at 230 ° C. under a load of 21.18 N, hereinafter abbreviated as MFR) of 1 to 7 g / 10 min, and / or from a melting peak of DSC. A propylene random copolymer having a determined melting point Tm of 155 ° C. or higher.
Polypropylene resin (B):
A propylene-based random copolymer having an MFR of 3 to 20 g / 10 min and a melting point Tm determined from the melting peak of DSC of 5 to 25 ° C. lower than that of the polypropylene resin (A).
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Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006247934A (en) * | 2005-03-09 | 2006-09-21 | Futamura Chemical Co Ltd | Charge preventing polyolefin film |
JP2008168607A (en) * | 2006-03-22 | 2008-07-24 | Hs Planning:Kk | Underlay film for cutting |
JP2011093259A (en) * | 2009-10-30 | 2011-05-12 | Mitsui Chemicals Tohcello Inc | Biaxially stretched laminated polypropylene film |
JP2012035624A (en) * | 2010-07-12 | 2012-02-23 | Mitsui Chemicals Tohcello Inc | Laminated film |
-
2003
- 2003-05-23 JP JP2003146048A patent/JP4419436B2/en not_active Expired - Fee Related
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP2006247934A (en) * | 2005-03-09 | 2006-09-21 | Futamura Chemical Co Ltd | Charge preventing polyolefin film |
JP4530885B2 (en) * | 2005-03-09 | 2010-08-25 | フタムラ化学株式会社 | Antistatic polyolefin film |
JP2008168607A (en) * | 2006-03-22 | 2008-07-24 | Hs Planning:Kk | Underlay film for cutting |
JP2011093259A (en) * | 2009-10-30 | 2011-05-12 | Mitsui Chemicals Tohcello Inc | Biaxially stretched laminated polypropylene film |
JP2012035624A (en) * | 2010-07-12 | 2012-02-23 | Mitsui Chemicals Tohcello Inc | Laminated film |
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