CN107531916B - 伸缩性膜以及包含其的制品 - Google Patents

伸缩性膜以及包含其的制品 Download PDF

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Publication number
CN107531916B
CN107531916B CN201680021935.5A CN201680021935A CN107531916B CN 107531916 B CN107531916 B CN 107531916B CN 201680021935 A CN201680021935 A CN 201680021935A CN 107531916 B CN107531916 B CN 107531916B
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China
Prior art keywords
olefin
layer
present
stretch film
film
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CN201680021935.5A
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CN107531916A (zh
Inventor
武田公平
内田翔
中川宗重
生岛伸祐
武田安洋
重松義武
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Nitto Denko Corp
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Nitto Denko Corp
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Priority claimed from PCT/JP2016/061788 external-priority patent/WO2016167242A1/ja
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Abstract

提供一种具有优异伸缩性和优异透气性的伸缩性膜。还提供一种包括该伸缩性膜的制品。本发明的伸缩性膜包含烯烃系树脂和填料。

Description

伸缩性膜以及包含其的制品
技术领域
本发明涉及一种伸缩性膜以及包括该伸缩性膜的制品。
背景技术
诸如尿布和口罩等卫生用品等的制品采用各种伸缩性膜(例如，专利文献1)。
鉴于诸如尿布和口罩等的用途，这样的伸缩性膜不仅要求具有优异的伸缩性，还要求具有优异的透气性。
现有技术文献
专利文献
专利文献1：日本特表平5-501386号公报
发明内容
发明要解决的问题
本发明是为了解决现有技术的问题而提出的，本发明的目的在于提供一种具有优异伸缩性和优异透气性的伸缩性膜。本发明的另一个目的是提供一种包括这种伸缩性膜的制品。
用于解决问题的方案
根据本发明的一个实施方案的伸缩性膜包含烯烃系树脂；和填料。
在优选的实施方案中，烯烃系树脂含有烯烃系弹性体。
在优选的实施方案中，烯烃系树脂含有α-烯烃系弹性体。
在优选的实施方案中，α-烯烃系弹性体包含选自乙烯系弹性体和丙烯系弹性体中的至少一种。
在优选的实施方案中，α-烯烃系弹性体通过使用茂金属催化剂制造。
在优选的实施方案中，填料包含选自无机颗粒和有机颗粒中的至少一种。
在优选的实施方案中，填料的平均粒径为0.5μm～50μm。
在优选的实施方案中，填料的平均粒径为0.7μm～5μm。
在优选的实施方案中，相对于100重量份的烯烃系树脂，填料的含量为50重量份～400重量份。
在优选的实施方案中，相对于100重量份的烯烃系树脂，填料的含量为100重量份～300重量份。
在优选的实施方案中，根据本发明实施方案的伸缩性膜由2层以上的层叠体形成。
在优选的实施方案中，根据本发明实施方案的伸缩性膜由层构造为A层/B层/C层的3层的层叠体形成。
在优选的实施方案中，B层含有烯烃系弹性体且不含有非弹性体性烯烃系树脂。
在优选的实施方案中，层构造包含以下构造中之一：
(1)[含有非弹性体性烯烃系树脂作为树脂组分的层]/[含有烯烃系弹性体作为树脂组分的层]/[含有非弹性体性烯烃系树脂作为树脂组分的层]的构造；和
(2)[含有烯烃系弹性体和非弹性体性烯烃系树脂的共混物作为树脂组分的层]/[含有烯烃系弹性体作为树脂组分的层]/[含有烯烃系弹性体和非弹性体性烯烃系树脂的共混物作为树脂组分的层]的构造。
在优选的实施方案中，根据本发明实施方案的伸缩性膜通过对未拉伸膜进行拉伸处理而获得。
在优选的实施方案中，根据本发明实施方案的伸缩性膜在其表面具有空隙。
在优选的实施方案中，拉伸根据本发明实施方案的伸缩性膜在其表面产生空隙。
在优选的实施方案中，根据本发明实施方案的伸缩性膜用于卫生用品。
根据本发明的一个实施方案的制品包括根据本发明实施方案的伸缩性膜。
发明的效果
根据本发明，可以提供具有优异伸缩性和优异透气性的伸缩性膜。还可以提供包括这种伸缩性膜的制品。
附图说明
图1是根据本发明的优选实施方案的伸缩性膜的实例的示意性平面图。
图2是根据本发明的优选实施方案的伸缩性膜的另一个实例的示意性平面图。
具体实施方式
<<伸缩性膜>>
本发明的伸缩性膜包括烯烃系树脂和填料。
本发明的伸缩性膜可以仅由1层形成，或者可以由2层以上的层叠体形成。
在不损害本发明的效果的范围内，可以采用任意适宜的厚度作为本发明的伸缩性膜的厚度。这样的厚度优选为20μm～150μm，更优选为40μm～150μm。
图1是根据本发明的优选实施方案的伸缩性膜的实例的示意性平面图。在图1中，伸缩性膜100包括烯烃系树脂10和填料20。
图2是根据本发明的优选实施方案的伸缩性膜的另一个实例的示意性平面图。在图2中，伸缩性膜100包括烯烃系树脂10和填料20，并且进一步包括空隙30。
当本发明的伸缩性膜是图1所示的实施方案时，伸缩性膜通过拉伸可以变为图2所示的实施方案。即，当本发明的伸缩性膜是图1所示的实施方案时，拉伸本发明的伸缩性膜可以在其表面产生空隙。
在本发明的伸缩性膜是图1所示的实施方案的情况下，即使未拉伸，伸缩性膜也可表现出优异的透气性。另外，在本发明的伸缩性膜是图1所示的实施方案的情况下，通过拉伸，伸缩性膜可以表现出优异的透气性。
在本发明的伸缩性膜是图2所示的实施方案的情况下，即使未拉伸，伸缩性膜也可表现出优异的透气性。另外，在本发明的伸缩性膜是图2所示的实施方案的情况下，通过拉伸，伸缩性膜可以表现出更优异的透气性。
本发明的伸缩性膜根据诸如尿布或口罩等用途中使用的部位要求的性能，可采用图1所示的实施方案或图2所示的实施方案。例如，当本发明的伸缩性膜是图1所示的实施方案时，即使未拉伸，该实施方案也能表现出优异的透气性，伸缩性膜可优选用于几乎不发生伸缩并且需要具有透气性的部位。另外，例如，当本发明的伸缩性膜是图1所示的实施方案时，该实施方案通过拉伸能表现出优异的透气性，伸缩性膜可优选用于发生伸缩并且需要具有透气性的部位。此外，当本发明的伸缩性膜是图2所示的实施方案时，伸缩性膜可优选用于几乎不发生伸缩并且需要具有透气性的部位、或者发生伸缩并且需要具有透气性的部位。
本发明的伸缩性膜包括烯烃系树脂。
烯烃系树脂可仅为1种树脂，或者可为2种以上的树脂的共混物。
本说明书中使用的术语“烯烃系树脂”旨在包括具有弹性体性(elastomericproperty)的“烯烃系弹性体”和不具有任何弹性体性的“非弹性体性烯烃系树脂”。即，当本说明书使用术语“烯烃系树脂”时，除非有特别的限定的记载，否则该术语意味着可存在以下3种情况：树脂仅为“烯烃系弹性体”的情况；树脂仅是“非弹性体性烯烃系树脂”的情况；和树脂是“烯烃系弹性体”和“非弹性体性烯烃系树脂”的共混物的情况。
烯烃系树脂优选含有烯烃系弹性体。当烯烃系树脂含有烯烃系弹性体时，本发明的伸缩性膜可以表现出优异的伸缩性。另外，当烯烃系树脂含有烯烃系弹性体时，通过与填料组合，本发明的伸缩性膜可以表现出优异的透气性。此外，当烯烃系树脂含有烯烃系弹性体时，可以抑制由本发明的伸缩性膜产生的气味。
烯烃系弹性体可仅为1种弹性体，或者可为2种以上的弹性体的共混物。
当本发明的伸缩性膜含有烯烃系弹性体时，热稳定性改进，由此例如可抑制在制造本发明的伸缩性膜时的热劣化。此外，当本发明的伸缩性膜含有烯烃系弹性体时，贮存稳定性改进，由此可抑制在贮存本发明的伸缩性膜期间的物性值的变动。
此外，当本发明的伸缩性膜含有烯烃系弹性体时，可简化弹性体层的制造工序，因此可抑制加工成本。这是因为以下原因：当采用烯烃系弹性体时，用于制造弹性体层的树脂可在减少其种类的数量的情况下进行挤出成形，由此可消除制造母料的需要。
当本发明的伸缩性膜仅由1层形成时，就更大程度地表现出本发明的效果而言，烯烃系树脂中的烯烃系弹性体的含量优选为50重量％～100重量％，更优选为70重量％～100重量％，还更优选为90重量％～100重量％，特别优选为95重量％～100重量％，最优选为实质上100重量％。当本发明的伸缩性膜仅由1层形成时，将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内，可使本发明的伸缩性膜的耐油性优异。此外，当本发明的伸缩性膜仅由1层形成时，将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内，能使本发明的伸缩性膜表现出优异的伸缩性。此外，在本发明的伸缩性膜仅由1层形成的情况下，当将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内时，通过与填料组合，本发明的伸缩性膜可以表现出优异的透气性。此外，将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内，可以抑制由本发明的伸缩性膜产生的气味。
当本发明的伸缩性膜由X层的层叠体形成时，其中X表示2以上，在不损害本发明的效果的范围内，伸缩性膜包括(X-1)层以下的各自不含烯烃系树脂的层(其他层)。
当本发明的伸缩性膜由2层以上的层叠体形成时，层数优选为2～10层，更优选为2～5层，还更优选为2～4层，特别优选为3层。当本发明的伸缩性膜由3层的层叠体形成时，可以更大程度地表现出本发明的效果。此外，本发明的伸缩性膜的可操作性优异并且耐粘连性优异。
当本发明的伸缩性膜由2层以上的层叠体形成时，各层可以是全部不同的种类，或者至少2层可以是相同的种类。
当本发明的伸缩性膜由2层以上的层叠体形成时，各层的厚度优选为2μm～100μm，更优选为2μm～70μm。
在本发明的伸缩性膜由3层的层叠体形成的情况下，当其层构造由“A层/B层/C层”表示时，作为表面层的A层和C层各自的厚度优选为2μm～40μm，更优选为2μm～30μm，还更优选为2μm～20μm，特别优选为2μm～10μm，最优选为2μm～8μm。
在本发明的伸缩性膜由3层的层叠体形成的情况下，当其层构造由“A层/B层/C层”表示时，作为中间层的B层的厚度优选为10μm～70μm，更优选为15μm～70μm，还更优选为20μm～70μm，特别优选为30μm～70μm，最优选为40μm～70μm。
在本发明的伸缩性膜由3层的层叠体形成的情况下，当其层构造由“A层/B层/C层”表示时，作为中间层的B层可以是多个层。即，在由“A层/B层/B′层/C层”表示的4层的层叠体的情况下，各层的厚度优选落入上述范围内，同时将B层和B′层的总厚度设定在上述的B层的厚度范围内。
在本发明的伸缩性膜由3层的层叠体形成的情况下，当其层构造由“A层/B层/C层”表示时，A层、B层和C层的厚度之间的比如下：“A层:B层:C层”的比例优选为1～30:40～98:1～30；“A层:B层:C层”的比例更优选为3～25:50～94:3～25；“A层:B层:C层”的比例还更优选为5～20:60～90:5～20；“A层:B层:C层”的比例特别优选为7～15:70～86:7～15。当A层、B层和C层的厚度之间的比落入上述范围内时，可以更大程度地表现出本发明的效果。此外，本发明的伸缩性膜的可操作性优异并且耐粘连性优异。
当本发明的伸缩性膜由3层的层叠体形成时，允许所有3层各自含有烯烃系弹性体的形式，也允许3层中的仅2层各自含有烯烃系弹性体的形式，还允许3层中的仅1层含有烯烃系弹性体的形式。当本发明的伸缩性膜具有这样的构造时，可以更大程度地表现出本发明的效果。此外，本发明的伸缩性膜的可操作性优异并且耐粘连性优异。
当本发明的伸缩性膜由3层的层叠体形成时，更优选是中间层(上述的B层)含有烯烃系弹性体且不含有非弹性体性烯烃系树脂的形式。当本发明的伸缩性膜具有这样的形式时，可以更大程度地表现出本发明的效果。此外，本发明的伸缩性膜的可操作性优异并且耐粘连性优异。
当本发明的伸缩性膜由3层的叠层体形成时，优选是以下构造中的之一：(1)[含有非弹性体性烯烃系树脂作为树脂组分的层]/[含有烯烃系弹性体作为树脂组分的层]/[含有非弹性体性烯烃系树脂作为树脂组分的层]的构造；和(2)[含有烯烃系弹性体和非弹性体性烯烃系树脂的共混物作为树脂组分的层]/[含有烯烃系弹性体作为树脂组分的层]/[含有烯烃系弹性体和非弹性体性烯烃系树脂的共混物作为树脂组分的层]的构造。当本发明的伸缩性膜具有这样的构造时，可以更大程度地表现出本发明的效果。此外，本发明的伸缩性膜的可操作性优异并且耐粘连性优异。
非弹性体性烯烃系树脂可仅为1种树脂，或者可为2种以上的树脂的共混物或共聚物。
当本发明的伸缩性膜由3层形成时，就更大程度地表现本发明的效果而言，烯烃系树脂中的烯烃系弹性体的含量优选为20重量％～80重量％，更优选为25重量％～75重量％，还更优选为30重量％～70重量％，特别优选为35重量％～65重量％，最优选为40重量％～60重量％。当本发明的伸缩性膜由3层形成时，将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内，能够使本发明的伸缩性膜的耐油性优异。此外，当本发明的伸缩性膜由3层形成时，将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内，能使本发明的伸缩性膜表现出优异的伸缩性。此外，在本发明的伸缩性膜由3层形成的情况下，当将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内时，通过与填料组合，本发明的伸缩性膜可以表现出优异的透气性。此外，将烯烃系树脂中的烯烃系弹性体的含量调整到上述范围内，可以抑制由本发明的伸缩性膜产生的气味。
当本发明的伸缩性膜由3层形成时，就更大程度地表现本发明的效果而言，烯烃系树脂中的非弹性体性烯烃系树脂的含量优选为20重量％～80重量％，更优选为25重量％～75重量％，还更优选为30重量％～70重量％，特别优选为35重量％～65重量％，最优选为40重量％～60重量％。在本发明的伸缩性膜由3层形成的情况下，当将烯烃系树脂中的非弹性体性烯烃系树脂的含量调整到上述范围内时，可以更大程度地表现出本发明的效果。此外，本发明的伸缩性膜的可操作性优异并且耐粘连性优异。
烯烃系弹性体的实例包括烯烃嵌段共聚物、烯烃无规共聚物、乙烯共聚物、丙烯共聚物、乙烯烯烃嵌段共聚物、丙烯烯烃嵌段共聚物、乙烯烯烃无规共聚物、丙烯烯烃无规共聚物、乙烯丙烯无规共聚物、乙烯(1-丁烯)无规共聚物、乙烯(1-戊烯)烯烃嵌段共聚物、乙烯(1-己烯)无规共聚物、乙烯(1-庚烯)烯烃嵌段共聚物、乙烯(1-辛烯)烯烃嵌段共聚物、乙烯(1-壬烯)烯烃嵌段共聚物、乙烯(1-癸烯)烯烃嵌段共聚物、丙烯乙烯烯烃嵌段共聚物、乙烯(α-烯烃)共聚物、乙烯(α-烯烃)无规共聚物、乙烯(α-烯烃)嵌段共聚物、无定形聚丙烯、上述聚合物和聚乙烯(LLDPE、LDPE、或HDPE等)的组合、上述聚合物和聚丙烯的组合、和它们的组合。
烯烃系弹性体的密度优选为0.890g/cm3～0.830g/cm3，更优选为0.888g/cm3～0.835g/cm3，还更优选为0.886g/cm3～0.835g/cm3，特别优选为0.885g/cm3～0.840g/cm3，最优选为0.885g/cm3～0.845g/cm3。当密度落入上述范围内的烯烃系弹性体引入弹性体层时，本发明的伸缩性膜的耐油性甚至可更优异。此外，密度落入上述范围内的烯烃系弹性体引入弹性体层能够使本发明的伸缩性膜进一步表现出优异的伸缩性。此外，当密度落入上述范围内的烯烃系弹性体引入弹性体层时，通过与填料组合，本发明的伸缩性膜可进一步表现出优异的透气性。此外，密度落入上述范围内的烯烃系弹性体引入弹性体层可进一步抑制由本发明的伸缩性膜产生的气味。
烯烃系弹性体在230℃和2.16kgf下的MFR优选为1.0g/10min～25.0g/10min，更优选为2.0g/10min～23.0g/10min，还更优选为2.0g/10min～21.0g/10min，特别优选为2.0g/10min～20.0g/10min，最优选为2.0g/10min～19.0g/10min。当MFR落入上述范围内的烯烃系弹性体引入弹性体层时，本发明的伸缩性膜的耐油性甚至可更优异。此外，MFR落入上述范围内的烯烃系弹性体引入弹性体层能够使本发明的伸缩性膜进一步表现出优异的伸缩性。此外，当MFR落入上述范围内的烯烃系弹性体引入弹性体层时，通过与填料组合，本发明的伸缩性膜可进一步表现出优异的透气性。此外，MFR落入上述范围内的烯烃系弹性体引入弹性体层可进一步抑制由本发明的伸缩性膜产生的气味。
烯烃系弹性体具体地优选为α-烯烃系弹性体。此类α-烯烃系弹性体中，更优选为选自乙烯系弹性体、丙烯系弹性体和1-丁烯系弹性体中的任意之一。当采用此类α-烯烃系弹性体作为烯烃系弹性体时，本发明的伸缩性膜的耐油性甚至可更优异。此外，采用此类α-烯烃系弹性体作为烯烃系弹性体能够使本发明的伸缩性膜进一步表现出优异的伸缩性。此外，当采用此类α-烯烃系弹性体作为烯烃系弹性体时，通过与填料组合，本发明的伸缩性膜可进一步表现出优异的透气性。此外，采用此类α-烯烃系弹性体作为烯烃系弹性体可进一步抑制由本发明的伸缩性膜产生的气味。
在α-烯烃系弹性体中，特别优选为乙烯系弹性体或丙烯系弹性体。当采用乙烯系弹性体或丙烯系弹性体作为烯烃系弹性体时，本发明的伸缩性膜的耐油性甚至可更优异。此外，采用乙烯系弹性体或丙烯系弹性体作为烯烃系弹性体，能够使本发明的伸缩性膜还进一步表现出优异的伸缩性。此外，当采用乙烯系弹性体或丙烯系弹性体作为烯烃系弹性体时，通过与填料组合，本发明的伸缩性膜甚至可进一步表现出优异的透气性。此外，采用乙烯系弹性体或丙烯系弹性体作为烯烃系弹性体甚至可进一步抑制由本发明的伸缩性膜产生的气味。
α-烯烃系弹性体作为市售品也可获得。这样的市售品的实例包括由MitsuiChemicals,Inc.制造的"Tafmer"(注册商标)系列中的一些产品(例如Tafmer PN-2070和Tafmer PN-3560)、和由Exxon Mobil Corporation制造的"Vistamaxx"(注册商标)系列中的一些产品(例如Vistamaxx 6202和Vistamaxx7010)。
α-烯烃系弹性体优选通过使用茂金属催化剂来制造。当采用通过使用茂金属催化剂制造的α-烯烃系弹性体时，本发明的伸缩性膜的耐油性甚至可更优异。此外，采用通过使用茂金属催化剂制造的α-烯烃系弹性体能够使本发明的伸缩性膜还进一步表现出优异的伸缩性。此外，当采用通过使用茂金属催化剂制造的α-烯烃系弹性体时，通过与填料组合，本发明的伸缩性膜甚至可进一步表现出优异的透气性。此外，采用通过使用茂金属催化剂制造的α-烯烃系弹性体甚至可进一步抑制由本发明的伸缩性膜产生的气味。
非弹性体性烯烃系树脂的实例包括α-烯烃均聚物、2种以上的α-烯烃的共聚物、嵌段聚丙烯、无规聚丙烯、和1种或2种以上的α-烯烃与任意其他乙烯基单体的共聚物。任意这样的共聚物的共聚形式例如是嵌段形式或无规形式。
α-烯烃的实例包括各自具有2～12个碳原子的α-烯烃。这样的α-烯烃的实例包括乙烯、丙烯、1-丁烯和4-甲基-1-戊烯。
α-烯烃均聚物的实例包括聚乙烯(PE)、均聚丙烯(PP)、聚(1-丁烯)和聚(4-甲基-1-戊烯)。
聚乙烯(PE)的实例包括低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE)、中密度聚乙烯(MDPE)和高密度聚乙烯(HDPE)。
均聚丙烯(PP)的结构可以是全同立构、无规立构和间同立构结构中的任意一种。
就更大程度地表现本发明的效果而言，非弹性体性烯烃系树脂优选含有选自聚乙烯(PE)和均聚丙烯(PP)中的至少一种，更优选含有选自高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE)和均聚丙烯(PP)中的至少一种。当非弹性体性烯烃系树脂含有选自高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE)和均聚丙烯(PP)中的至少一种时，可提供可操作性还更优异的伸缩性膜。就更大程度地表现本发明的效果而言，非弹性体性烯烃系树脂中的选自高密度聚乙烯(HDPE)、低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE)和均聚丙烯(PP)中的至少一种的含量优选为50重量％～100重量％，更优选为70重量％～100重量％，还更优选为80重量％～100重量％，还进一步更优选为90重量％～100重量％，特别优选为95重量％～100重量％，最优选为实质上100重量％。
2种以上的α-烯烃的共聚物的实例包括乙烯/丙烯共聚物、乙烯/1-丁烯共聚物、乙烯/丙烯/1-丁烯共聚物、乙烯/具有5～12个碳原子的α-烯烃的共聚物、和丙烯/具有5～12个碳原子的α-烯烃的共聚物。
1种或2种以上的α-烯烃与任意其他乙烯基单体的共聚物的实例包括乙烯/乙酸乙烯酯共聚物、乙烯/丙烯酸烷基酯共聚物、乙烯/甲基丙烯酸烷基酯共聚物、和乙烯-非共轭二烯共聚物。
可以使用市售品作为非弹性体性烯烃系树脂。
本发明的伸缩性膜包括填料。填料优选为选自无机颗粒和有机颗粒中的至少一种。填料可以仅是1种填料，或者可以是2种以上的填料。当本发明的伸缩性膜含有填料时，本发明的伸缩性膜可以表现出优异的透气性。
无机颗粒的实例包括滑石、氧化钛、氧化钙、氧化镁、氧化锌、碳酸钙、二氧化硅、粘土、云母、硫酸钡、晶须和氢氧化镁。
有机颗粒的实例包括亚克力珠(acrylic bead)、苯乙烯珠和有机硅树脂颗粒。
在不损害本发明的效果的范围内，可以采用任意适宜的平均粒径作为填料的平均粒径。填料的平均粒径的下限优选为0.5μm以上，更优选为0.6μm以上，还更优选为0.7μm以上，其上限优选为50μm以下，更优选为30μm以下，还更优选为10μm以下，特别优选为5μm以下。填料的平均粒径调整到上述范围内能够使本发明的伸缩性膜表现出更优异的透气性。
在不损害本发明的效果的范围内，可以采用任意适宜的含量作为填料的含量。相对于100重量份的伸缩性膜中的烯烃系树脂，填料的含量的下限优选为50重量份以上，更优选为70重量份以上，还更优选为100重量份以上，其上限优选为400重量份以下，更优选为350重量份以下，还更优选为300重量份以下。填料的含量调整到上述范围内能够使本发明的伸缩性膜表现出更优异的透气性。
填料可以涂有脱模剂用于防止聚集。此类脱模剂的实例包括脂肪酸酰胺系脱模剂、有机硅系脱模剂、氟系脱模剂和长链烷基系脱模剂。其中，优选为脂肪酸酰胺系脱模剂，更优选为饱和脂肪酸双酰胺。可以采用任意适宜的用量作为脱模剂的用量。
在不损害本发明的效果的范围内，本发明的伸缩性膜可以含有任意适宜的其他组分。其他组分可以仅是1种组分，或者可以是2种以上的组分。这样的其他组分的实例包括紫外线吸收剂、热稳定剂、脱模剂、润滑剂、着色剂(例如染料)、抗氧化剂、积料防止剂(anti-build up agent)、防粘连剂、发泡剂、其他聚合物、增粘剂、增塑剂、抗劣化剂、抗静电剂和光稳定剂。这些组分可以单独使用或者组合使用。
紫外线吸收剂的实例包括苯并三唑系化合物、二苯甲酮系化合物和苯甲酸酯系化合物。只要成形时紫外线吸收剂不渗出，则可以采用任意适宜的含量作为紫外线吸收剂的含量。
热稳定剂的实例包括受阻胺系化合物、磷系化合物和氰基丙烯酸酯系化合物。只要成形时热稳定剂不渗出，则可以采用任意适宜的含量作为热稳定剂的含量。
脱模剂的实例包括脂肪酸酰胺系脱模剂、有机硅系脱模剂、氟系脱模剂和长链烷基系脱模剂。其中，从能够形成剥离性与针对由于渗出引起的污染的耐性之间的平衡更优异的剥离层的角度，优选为脂肪酸酰胺系脱模剂，更优选为饱和脂肪酸双酰胺。可以采用任意适宜的含量作为脱模剂的含量。
本发明的伸缩性膜优选通过对未拉伸膜进行拉伸处理而获得。未拉伸膜的此类拉伸处理可以称为“预伸长(pre-extension)”。当对未拉伸膜进行拉伸处理时，本发明的伸缩性膜可以表现出更优异的伸缩性。另外，当对未拉伸膜进行拉伸处理时，通过与填料组合，本发明的伸缩性膜甚至可进一步表现出优异的透气性。
预伸长是具有以下含义的预伸长：考虑到伸缩性膜在其最终利用时(例如，尿布的制造时和尿布的使用时)再次伸长(后伸长)的事实，将本发明的伸缩性膜预先伸长。
预伸长优选在本发明的伸缩性膜已经制造出并充分固化之后进行。
预伸长可沿至少一个方向对整个的原始长度或宽度进行，或者可对部分的原始长度或宽度进行。此外，预伸长可沿任意适宜的方向进行。预伸长优选沿至少一个方向对原始长度或宽度进行。
预伸长的伸长度优选为1.5倍以上且小于2.5倍(典型地为2.0倍)，更优选为2.5倍以上且小于3.5倍(典型地为3.0倍)，还更优选为3.5倍以上且小于4.5倍(典型地为4.0倍)，特别优选为4.5倍以上且小于5.5倍(典型地为5.0倍)。例如，2.0倍的预伸长意味着当伸缩性膜的原始长度表示为L时，将伸缩性膜伸长(有时称为“拉伸”)以具有长度2L。通过预伸长到这样的伸长度，本发明的伸缩性膜可以表现出更优异的伸缩性。另外，当本发明的伸缩性膜预伸长到这样的伸长度时，通过与填料组合，伸缩性膜甚至可进一步表现出优异的透气性。
预伸长优选在低于烯烃系树脂的熔点的温度下进行。通过在这样的温度下进行预伸长，本发明的伸缩性膜可以表现出更优异的伸缩性。另外，当本发明的伸缩性膜在这样的温度下进行预伸长时，通过与填料组合，伸缩性膜甚至可进一步表现出优异的透气性。
当本发明的伸缩性膜如上所述优选进行预伸长时，烯烃系树脂发生塑性变形或者伸长超过烯烃系树脂的脆性断裂点，由此该膜可以表现出优异的伸缩性。
<<伸缩性膜的制造>>
在不损害本发明的效果的范围内，可以采用任意适宜的方法作为本发明的伸缩性膜的制造方法。伸缩性膜优选通过以下获得：通过任意适宜的方法制造未拉伸膜；然后对未拉伸膜进行拉伸处理。拉伸处理优选在未拉伸膜已经制造出并充分固化之后进行。关于拉伸处理的细节如上所述。
未拉伸膜的制造方法典型地例如是涉及使用T模成形机将用于本发明的伸缩性膜的材料成形以制造未拉伸膜的方法。例如，本发明的伸缩性膜的筒状体可以通过以下制造：使用T模成形机将用于伸缩性膜的材料从其T模头挤出；然后将挤出的材料卷成筒状。除了使用T模头的T模法以外，还可以采用吹胀法等。
<<伸缩性膜的用途>>
本发明的伸缩性膜能够用于其中可有效地利用本发明的效果的任意适宜的制品。即，本发明的制品包括本发明的伸缩性膜。这样的制品的典型实例是卫生用品。这样的卫生用品的实例包括尿布(尤其是将本发明的伸缩性膜用作耳翼(ear)部分的伸缩性材料或者腰周围或腿周围的开口部分的伸缩性材料(腰头或褶裥部)这样的尿布)、绷带、和口罩。
实施例
以下通过实施例具体说明本发明。然而，本发明绝不限于这些实施例。在实施例等中的试验和评价方法如下所述。此外，除非另有说明，“份”指“重量份”，且“％”指“重量％”。
<透气性评价方法>
使用王研式透气度计(sec/100cc)(Asahi Seiko Co.,Ltd.制造，商品名：EG01-7-7MR)测定透气性。将透气度大于99,999sec/100cc的伸缩性膜判断为“无透气性”。在表1中，列“膜原样”指的是将所制造的膜保持原样时测定该膜的透气性。此外，在表1中，列“宽度方向两倍”指的是在将所制造的膜沿其宽度方向伸长2倍的状态下测定该膜的透气性。
[实施例1]
将70重量份的无定形PP(Exxon Mobil Corporation制造，商品名：Vistamaxx6202)、30重量份的乙烯系弹性体(Mitsui Chemicals,Inc.制造，Tafmer PN-2070)和150重量份的碳酸钙投入挤出机中，并从其T模头挤出从而制造厚度为150μm的未拉伸膜(1)。
然后，将未拉伸膜(1)沿其加工方向以3.8倍的倍率预伸长，从而提供伸缩性膜(1)。
结果示于表1。
[实施例2]
将70重量份的无定形PP(Exxon Mobil Corporation制造，商品名：Vistamaxx6202)、30重量份的乙烯系弹性体(Mitsui Chemicals,Inc.制造，Tafmer PN-2070)和250重量份的碳酸钙投入挤出机中，并从其T模头挤出从而制造厚度为150μm的未拉伸膜(2)。
然后，将未拉伸膜(2)沿其加工方向以3.8倍的倍率预伸长，从而提供伸缩性膜(2)。
结果示于表1。
[实施例3]
将100重量份的聚乙烯(HDPE)(Tosoh Corporation制造，商品名：Nipolon Hard1000)和150重量份的碳酸钙(平均粒径＝1.1μm)投入表层挤出机中。将100重量份的无定形PP(Exxon Mobil Corporation制造，商品名：Vistamaxx7010)和150重量份的碳酸钙(平均粒径＝1.1μm)投入中间层挤出机中。将这些材料从挤出机的T模头共挤出三层，从而制造厚度为80μm的未拉伸膜(3)。
然后，将未拉伸膜(3)沿其宽度方向以3.8倍的倍率预伸长，从而提供伸缩性膜(3)。
结果示于表2。
[实施例4]
将30重量份的无定形PP(Exxon Mobil Corporation制造，商品名：Vistamaxx7010)、70重量份的聚乙烯(LLDPE)(Prime Polymer Co.,Ltd.制造，商品名：ULTZEX 2022L)和150重量份的碳酸钙(平均粒径＝1.1μm)投入表层挤出机中。将100重量份的无定形PP(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010)和150重量份的碳酸钙(平均粒径＝1.1μm)投入中间层挤出机中。将这些材料从挤出机的T模头共挤出三层，从而制造厚度为80μm的未拉伸膜(3)。
然后，将未拉伸膜(3)沿其宽度方向以3.8倍的倍率预伸长，从而提供伸缩性膜(3)。
结果示于表2。
表1
Figure BDA0001433564700000171
表2
Figure BDA0001433564700000181
产业上的可利用性
本发明的伸缩性膜能够用于其中可有效地利用本发明的效果的任意适宜的制品。即，本发明的制品包括本发明的伸缩性膜。这样的制品的典型实例是卫生用品。这样的卫生用品的实例包括尿布(尤其是将本发明的伸缩性膜用作耳翼(ear)部分的伸缩性材料或者腰周围或腿周围的开口部分的伸缩性材料(腰头或褶裥部)这样的尿布)、绷带、和口罩。
附图标记列表
10 烯烃系树脂
20 填料
30 空隙
100 伸缩性膜

Claims (10)

1.一种伸缩性膜，其包含烯烃系树脂；和填料，
所述烯烃系树脂含有烯烃系弹性体，
相对于100重量份的所述烯烃系树脂，所述填料的含量为50重量份～400重量份，
所述伸缩性膜由层构造为A层/B层/C层的3层的层叠体形成，
所述层构造包含以下构造中之一：
(1)[含有非弹性体性烯烃系树脂作为树脂组分的层]/[含有烯烃系弹性体作为树脂组分的层]/[含有非弹性体性烯烃系树脂作为树脂组分的层]的构造；和
(2)[含有烯烃系弹性体和非弹性体性烯烃系树脂的共混物作为树脂组分的层]/[含有烯烃系弹性体作为树脂组分的层]/[含有烯烃系弹性体和非弹性体性烯烃系树脂的共混物作为树脂组分的层]的构造，
A层、B层和C层的厚度之间的比为：A层:B层:C层＝1～30:40～98:1～30，
所述B层含有烯烃系弹性体且不含有非弹性体性烯烃系树脂，
所述伸缩性膜在其表面具有空隙，
所述伸缩性膜通过对未拉伸膜进行拉伸处理而获得，
拉伸所述伸缩性膜在其表面产生空隙。
2.根据权利要求1所述的伸缩性膜，其中所述烯烃系树脂含有α-烯烃系弹性体。
3.根据权利要求2所述的伸缩性膜，其中所述α-烯烃系弹性体包含选自乙烯系弹性体和丙烯系弹性体中的至少一种。
4.根据权利要求2所述的伸缩性膜，其中所述α-烯烃系弹性体通过使用茂金属催化剂制造。
5.根据权利要求1所述的伸缩性膜，其中所述填料包含选自无机颗粒和有机颗粒中的至少一种。
6.根据权利要求1所述的伸缩性膜，其中所述填料的平均粒径为0.5μm～50μm。
7.根据权利要求6所述的伸缩性膜，其中所述填料的平均粒径为0.7μm～5μm。
8.根据权利要求1所述的伸缩性膜，其中相对于100重量份的所述烯烃系树脂，所述填料的含量为100重量份～300重量份。
9.根据权利要求1所述的伸缩性膜，其中所述伸缩性膜用于卫生用品。
10.一种制品，其包含根据权利要求1所述的伸缩性膜。
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JP2015020317A (ja) * 2013-07-18 2015-02-02 日東電工株式会社 伸縮性積層体およびそれを含む物品
JP2015063633A (ja) * 2013-09-26 2015-04-09 東レ株式会社 伸縮性フィルム

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