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CN107428980A - 伸缩性多孔膜和制品 - Google Patents

伸缩性多孔膜和制品 Download PDF

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Publication number
CN107428980A
CN107428980A CN201680021971.1A CN201680021971A CN107428980A CN 107428980 A CN107428980 A CN 107428980A CN 201680021971 A CN201680021971 A CN 201680021971A CN 107428980 A CN107428980 A CN 107428980A
Authority
CN
China
Prior art keywords
retractility
perforated membrane
membrane according
propylene
weight
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201680021971.1A
Other languages
English (en)
Inventor
武田安洋
重松義武
武田公平
内田翔
中川宗重
生岛伸祐
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.)
Nitto Denko Corp
Original Assignee
Nitto Denko Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=57488896&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=CN107428980(A) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Nitto Denko Corp filed Critical Nitto Denko Corp
Priority to CN202310898756.1A priority Critical patent/CN116903958A/zh
Priority claimed from PCT/JP2016/061787 external-priority patent/WO2016167241A1/ja
Publication of CN107428980A publication Critical patent/CN107428980A/zh
Pending legal-status Critical Current

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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多孔膜。还提供一种包括该伸缩性多孔膜的制品。本发明的伸缩性多孔膜是在其表面具有空隙的伸缩性多孔膜，其中：其使用王研式透气度计测定的透气度小于99,999sec/100cc；该伸缩性多孔膜具有在其100％伸长状态下使用王研式透气度计测定的透气度小于60,000sec/100cc的伸长方向；和该伸缩性多孔膜具有在滞后试验中，将伸缩性多孔膜从宽度20mm和卡盘间距30mm以牵引速度50mm/min牵引至卡盘间距60mm并保持1分钟、然后释放卡盘间距的牵引时的残余应变为10mm以下的牵引方向。

Description

伸缩性多孔膜和制品
技术领域
本发明涉及一种伸缩性多孔膜和制品。
背景技术
如橡皮膏等卫生用品等的伸缩性制品采用各种伸缩性膜。
这些伸缩性膜在某些用途中不仅要求具有优异的伸缩性，还要求具有优异的透气性。例如，现有技术典型的橡皮膏(例如，参照专利文献1)由于使用聚氯乙烯作为橡皮膏的伸缩性膜的聚合物组分而具有一定程度的防水性。然而，该橡皮膏透气性差，因此涉及到在将橡皮膏贴附至皮肤期间，橡皮膏贴附部分的皮肤变得闷热而发白，发生浸软现象的问题。
现有技术文献
专利文献
专利文献1：日本特开2000-167037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多孔膜。本发明的另一个目的在于提供一种包括这种伸缩性多孔膜的制品。
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多孔膜在其表面具有空隙，其中：
该伸缩性多孔膜使用王研式透气度计测定的透气度(air permeability)小于99,999sec/100cc；
该伸缩性多孔膜具有在伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于60,000sec/100cc的伸长方向(extending direction)；和
该伸缩性多孔膜具有在滞后试验中，将伸缩性多孔膜从宽度20mm和卡盘间距30mm以牵引速度50mm/min牵引至卡盘间距60mm并保持1分钟、然后释放卡盘间距的牵引时的残余应变为10mm以下的牵引方向(pulling direction)。
在一个实施方案中，使用王研式透气度计测定的透气度小于60,000sec/100cc。
在一个实施方案中，使用王研式透气度计测定的透气度小于40,000sec/100cc。
在一个实施方案中，在伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于30,000sec/100cc。
在一个实施方案中，在伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于5,000sec/100cc。
在一个实施方案中，残余应变为8mm～1mm。
在一个实施方案中，残余应变为6mm～2mm。
在一个实施方案中，本发明的伸缩性多孔膜的厚度为30μm～300μm。
在一个实施方案中，本发明的伸缩性多孔膜的厚度为50μm～150μm。
在一个实施方案中，本发明的伸缩性多孔膜包括聚合物组分和填料。
在一个实施方案中，聚合物组分含有丙烯系弹性体。
在一个实施方案中，聚合物组分中的丙烯系弹性体的含量为30重量％～100重量％。
在一个实施方案中，丙烯系弹性体的MFR为0.1g/10min～18g/10min。
在一个实施方案中，丙烯系弹性体的MFR为2g/10min～5g/10min。
在一个实施方案中，丙烯系弹性体包括茂金属系弹性体。
在一个实施方案中，聚合物组分含有线性低密度聚乙烯。
在一个实施方案中，聚合物组分中的线性低密度聚乙烯的含量为5重量％～60重量％。
在一个实施方案中，填料包括选自无机颗粒和有机颗粒中的至少一种。
根据本发明的一个实施方案的制品包括本发明的伸缩性多孔膜。
在一个实施方案中，本发明的制品进一步包括压敏粘合剂层。
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多孔膜。还可以提供包括这种伸缩性多孔膜的制品。
附图说明
图1是根据本发明的一个实施方案的伸缩性多孔膜的实例的示意性平面图。
图2是根据本发明的一个实施方案的伸缩性多孔膜的另一实例的示意性平面图。
图3是显示在测定残余应变时的滞后试验中的应力与应变之间的关系的图。
具体实施方式
<<伸缩性多孔膜>>
本发明的伸缩性多孔膜为在其表面具有空隙的伸缩性多孔膜。由于伸缩性多孔膜在其表面具有空隙，因此本发明的伸缩性多孔膜具有优异的透气性。
本发明的伸缩性多孔膜使用王研式透气度计测定的透气度小于99,999sec/100cc，优选小于80,000sec/100cc，更优选小于70,000sec/100cc，还更优选小于60,000sec/100cc，特别优选小于50,000sec/100cc，最优选小于40,000sec/100cc。当本发明的伸缩性多孔膜使用王研式透气度计测定的透气度落入上述范围内时，本发明的伸缩性多孔膜可以具有优异的透气性。
本发明的伸缩性多孔膜具有在伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于60,000sec/100cc的伸长方向。该透气度优选小于50,000sec/100cc，更优选小于40,000sec/100cc，还更优选小于30,000sec/100cc，特别优选小于10,000sec/100cc，最优选小于5,000sec/100cc。当本发明的伸缩性多孔膜具有在伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度落入上述范围内的伸长方向时，本发明的伸缩性多孔膜在其伸长状态下可具有优异的透气性。
短语“具有伸长方向”指的是本发明的伸缩性多孔膜仅需要具有至少一个的透气度落入上述范围内的伸长方向。当本发明的伸缩性多孔膜为未拉伸膜时，这样的伸长方向的优选实例典型的是膜的全部方向，当本发明的伸缩性多孔膜为单轴拉伸膜时，其优选实例是与拉伸的方向垂直的方向(当将膜沿其长度(MD)方向拉伸时为CD方向)。另外，当本发明的伸缩性多孔膜为双轴拉伸膜时，透气度落入上述范围内的伸长方向根据诸如拉伸是同时拉伸还是顺序拉伸、两轴之间的拉伸倍率的差异等各种条件决定。
本发明的伸缩性多孔膜具有在滞后试验中，将伸缩性多孔膜从宽度20mm和卡盘间距30mm以牵引速度50mm/min牵引至卡盘间距60mm并保持1分钟、然后释放卡盘间距的牵引时的残余应变为10mm以下的牵引方向。残余应变优选为9mm～1mm，更优选为8mm～1mm，还更优选为7mm～1mm，特别优选为6mm～2mm，最优选为5mm～3mm。当本发明的伸缩性多孔膜具有残余应变落入上述范围内的牵引方向时，本发明的伸缩性多孔膜可以具有优异的伸缩性。
短语“具有牵引方向”指的是本发明的伸缩性多孔膜仅需要具有至少一个的残余应变落入上述范围内的牵引方向。当本发明的伸缩性多孔膜为未拉伸膜时，这样的牵引方向的优选实例典型的是膜的全部方向，当本发明的伸缩性多孔膜为单轴拉伸膜时，其优选实例是与拉伸的方向垂直的方向(当将膜沿其长度(MD)方向拉伸时为CD方向)。另外，当本发明的伸缩性多孔膜为双轴拉伸膜时，残余应变落入上述范围内的拉伸方向根据诸如拉伸是同时拉伸还是顺序拉伸、两轴之间的拉伸倍率的差异等各种条件决定。
本发明的伸缩性多孔膜的厚度优选为30μm～300μm，更优选为40μm～200μm，还更优选为50μm～150μm，特别优选为60μm～140μm，最优选为70μm～120μm。当本发明的伸缩性多孔膜的厚度落入上述范围内时，本发明的伸缩性多孔膜可以具有更优异的伸缩性和更优异的透气性。
本发明的伸缩性多孔膜优选包括聚合物组分和填料。
图1是根据本发明的一个实施方案的伸缩性多孔膜的实例的示意性平面图。在图1中，伸缩性多孔膜100包括聚合物组分10和填料20。
图2是根据本发明的一个实施方案的伸缩性多孔膜的另一实例的示意性平面图。在图2中，伸缩性多孔膜100包括聚合物组分10和填料20，并且进一步包括空隙30。
当本发明的伸缩性多孔膜是图1所示的实施方案时，伸缩性多孔膜通过进行伸长可以变为图2所示的实施方案。即，当本发明的伸缩性多孔膜是图1所示的实施方案时，通过进行伸长，可以在本发明的伸缩性多孔膜的表面产生适度的空隙。凭借适度的空隙，本发明的伸缩性多孔膜可以表现出充分的透气性。另外，伸缩性多孔膜可以具有与现有技术典型的橡皮膏同样的防水性。
在本发明的伸缩性多孔膜是图1所示的实施方案的情况下，由于聚合物组分和填料之间凭借填料的存在而存在界面，即使不伸长，伸缩性多孔膜也能表现出优异的透气性。
本发明的伸缩性多孔膜根据使用伸缩性多孔膜的部位要求的性能，可采用图1所示的实施方案或图2所示的实施方案。
在不损害本发明的效果的范围内，可以采用任意适宜的聚合物组分作为本发明的伸缩性多孔膜中的聚合物组分。
聚合物组分优选含有丙烯系弹性体。
当聚合物组分含有丙烯系弹性体时，本发明的伸缩性多孔膜可以表现出更优异的伸缩性。另外，当聚合物组分含有丙烯系弹性体时，通过与填料组合，本发明的伸缩性多孔膜可以表现出更优异的透气性。
丙烯系弹性体可以仅是1种弹性体，或可以是2种以上的弹性体。
当本发明的伸缩性多孔膜含有丙烯系弹性体时，热稳定性改进，由此例如可抑制在制造本发明的伸缩性多孔膜时的热劣化。另外，当本发明的伸缩性多孔膜含有丙烯系弹性体时，贮存稳定性改进，由此可抑制在贮存本发明的伸缩性多孔膜期间的物性值的变动。
当本发明的伸缩性多孔膜含有丙烯系弹性体时，可简化本发明的伸缩性多孔膜的制造工序，因此可抑制加工成本。这是因为以下原因：当采用丙烯系弹性体时，可在制造本发明的伸缩性多孔膜时进行挤出成形，由此可消除制造母料的需要。
就进一步表现本发明的效果而言，聚合物组分中的丙烯系弹性体的含量优选为30重量％～100重量％，更优选为40重量％～95重量％，还更优选为50重量％～90重量％，特别优选为55重量％～85重量％，最优选60重量％～80重量％。当将聚合物组分中的丙烯系弹性体的含量设定在上述范围内时，本发明的伸缩性多孔膜可以表现出更优异的伸缩性。另外，当将聚合物组分中的丙烯系弹性体的含量设定在上述范围内时，通过与填料组合，本发明的伸缩性多孔膜可以表现出更优异的透气性。
丙烯系弹性体的实例包括丙烯共聚物、丙烯烯烃嵌段共聚物、丙烯烯烃无规共聚物、丙烯乙烯烯烃嵌段共聚物和无定形聚丙烯。
丙烯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。当将丙烯系弹性体的密度设定在上述范围内时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当将丙烯系弹性体的密度设定在上述范围内时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
丙烯系弹性体在230℃和2.16kgf下的MFR优选为0.1g/10min～18g/10min，更优选为0.5g/10min～15g/10min，还更优选为1.0g/10min～10g/10min，特别优选为1.5g/10min～7g/10min，最优选为2g/10min～5g/10min。当丙烯系弹性体的MFR设定在上述范围内时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当将丙烯系弹性体的MFR设定在上述范围内时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
丙烯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、和由Exxon MobilCorporation制造的“Vistamaxx”(注册商标)系列中的一些产品(例如Vistamaxx 7010)。
丙烯系弹性体优选为茂金属系弹性体(作为茂金属系弹性体的丙烯系弹性体有时称为“茂金属聚丙烯系弹性体”)。茂金属系弹性体是使用茂金属催化剂制造的弹性体。当采用茂金属系弹性体作为丙烯系弹性体时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当采用茂金属系弹性体作为丙烯系弹性体时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
聚合物组分优选含有线性低密度聚乙烯。
当聚合物组分含有丙烯系弹性体和线性低密度聚乙烯时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当聚合物组分含有丙烯系弹性体和线性低密度聚乙烯时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
线性低密度聚乙烯可以仅是1种聚乙烯，或者可以是2种以上的聚乙烯。
当本发明的伸缩性多孔膜含有丙烯系弹性体和线性低密度聚乙烯时，热稳定性改进，由此例如可抑制在制造本发明的伸缩性多孔膜时的热劣化。另外，当本发明的伸缩性多孔膜含有丙烯系弹性体和线性低密度聚乙烯时，贮存稳定性改进，由此可抑制在贮存本发明的伸缩性多孔膜期间的物性值的变动。
当本发明的伸缩性多孔膜含有丙烯系弹性体和线性低密度聚乙烯时，能够简化本发明的伸缩性多孔膜的制造工序，并因此能够抑制加工成本。这是因为以下原因：当采用丙烯系弹性体和线性低密度聚乙烯时，可以在制造本发明的伸缩性多孔膜时进行挤出成形，并因此可以消除制造母料的需要。
就进一步表现本发明的效果而言，聚合物组分中的线性低密度聚乙烯的含量优选为0重量％～70重量％，更优选为5重量％～60重量％，还更优选为10重量％～50重量％，特别优选为15重量％～45重量％，最优选为20重量％～40重量％。当将聚合物组分中的线性低密度聚乙烯的含量设定在上述范围内时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当将聚合物组分中的线性低密度聚乙烯的含量设定在上述范围内时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
线性低密度聚乙烯的密度优选为0.910g/cm3～0.940g/cm3。当将线性低密度聚乙烯的密度设定在上述范围内时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当将线性低密度聚乙烯的密度设定在上述范围内时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
线性低密度聚乙烯在230℃和2.16kgf下的MFR优选为1g/10min～50g/10min。当将线性低密度聚乙烯的MFR设定在上述范围内时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当将线性低密度聚乙烯的MFR设定在上述范围内时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
线性低密度聚乙烯作为市售品也可获得。这样的市售品的实例包括由PrimePolymer Co.,Ltd.制造的“ULTZEX”(注册商标)系列中的一些产品。
线性低密度聚乙烯优选是茂金属系线性低密度聚乙烯。茂金属系线性低密度聚乙烯是使用茂金属催化剂制造的线性低密度聚乙烯。当采用茂金属系线性低密度聚乙烯作为线性低密度聚乙烯时，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当采用茂金属系线性低密度聚乙烯作为线性低密度聚乙烯时，通过与填料组合，本发明的伸缩性多孔膜能够表现出更优异的透气性。
本发明的伸缩性多孔膜优选包括填料。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。当本发明的伸缩性多孔膜含有填料时，本发明的伸缩性多孔膜能够表现出更优异的透气性。
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。填料的平均粒径优选为0.5μm～50μm。填料的平均粒径调整到上述范围内能使得本发明的伸缩性多孔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重量份的伸缩性多孔膜中的聚合物组分，填料的含量优选为50重量份～400重量份。填料的含量调整到上述范围内能使得本发明的伸缩性多孔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，本发明的伸缩性多孔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、填料、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，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，可以采用任意适宜的含量作为热稳定剂的含量。
<<伸缩性多孔膜的制造>>
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多孔膜的制造方法。
本发明的伸缩性多孔膜的制造方法的典型实例是涉及使用T模成形机将用于伸缩性多孔膜的材料成形以制造伸缩性多孔膜的方法。例如，本发明的伸缩性多孔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多孔膜的材料从其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。
本发明的伸缩性多孔膜可以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)”。当通过对未拉伸膜进行拉伸处理获得本发明的伸缩性多孔膜时，伸缩性多孔膜能够表现出更优异的伸缩性。另外，当通过对未拉伸膜进行拉伸处理获得本发明的伸缩性多孔膜时，通过与填料组合，伸缩性多孔膜能够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：考虑到伸缩性多孔膜在其最终利用时再次伸长(后伸长)的事实，将本发明的伸缩性多孔膜预先伸长。
预伸长优选在本发明的伸缩性多孔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多孔膜的原始长度表示为L时，将伸缩性多孔膜伸长(有时称为“拉伸”)以具有长度2L。通过预伸长到这样的伸长度，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当本发明的伸缩性多孔膜预伸长到这样的伸长度时，通过与填料组合，伸缩性多孔膜能够表现出更优异的透气性。
预伸长优选在低于聚合物组分的熔点的温度下进行。通过在这样的温度下进行预伸长，本发明的伸缩性多孔膜能够表现出更优异的伸缩性。另外，当本发明的伸缩性多孔膜在这样的温度下进行预伸长时，通过与填料组合，伸缩性多孔膜能够表现出更优异的透气性。
当本发明的伸缩性多孔膜如上所述优选进行预伸长时，聚合物组分发生塑性变形或者伸长超过聚合物的脆性断裂点，由此伸缩性多孔膜能够表现出优异的伸缩性。
<<伸缩性多孔膜的用途>>
本发明的伸缩性多孔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多孔膜。这样的制品的典型实例是橡皮膏。
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％”。
<透气度>
透气度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。将透气度大于99,999sec/100cc的伸缩性多孔膜判断为“无透气性”。进行以下2种透气度测定：测定所制造的膜在其存在状态(正常状态)下的透气度；测定膜在100％伸长状态下的透气度。在所制造的膜100％伸长状态的测定中，当膜是单轴拉伸膜时，将膜沿与拉伸的方向垂直的方向(当将膜沿其长度(MD)方向拉伸时为CD方向)伸长。
<残余应变>
进行图3所示的滞后试验，直到将宽度20mm的试验片以牵引速度50mm/min从卡盘间距30mm牵引至卡盘间距60mm并保持1分钟，然后释放卡盘间距的牵引后，测定释放卡盘间距的牵引时的残余应变。在残余应变的测定中，当所制造的膜是单轴拉伸膜时，将膜沿与拉伸的方向垂直的方向(当将膜沿其长度(MD)方向拉伸时为CD方向)牵引。
<浸软现象的评价>
将100份的Zeon Corporation制造的QUINTAC 3433N、50份的Yasuhara ChemicalCo.,Ltd.制造的CLEARON M105和150份的Yasuhara Chemical Co.,Ltd.制造的YS RESINTO-L混炼以制备热熔压敏粘合剂(A)。
将热熔压敏粘合剂(A)通过喷涂涂布至待评价的膜的一个表面上。将该膜切成CD方向80mm×长度方向20mm的片，将该片卷绕在指尖上。观察卷绕24小时后该片卷绕部分的皮肤状态，并通过以下标准进行评价。
皮肤自其正常状态起保持不变的情况：○
皮肤发白的情况：×
<关节的追随性试验>
(指关节)
将热熔压敏粘合剂(A)通过喷涂涂布至待评价的膜的一个表面上。将该膜切成CD方向80mm×长度方向20mm的片，并将该片卷绕在指尖的第二关节上。观察该关节弯曲5分钟后的状态，通过以下标准进行评价。
手指和膜之间不存在间隙的情况：○
膜完全伸长，因此手指和膜之间存在间隙的情况：×
(肘关节)
将热熔压敏粘合剂(A)通过喷涂涂布至待评价的膜的一个表面上。将该膜切成CD方向130mm×长度方向95mm的片，并将该片卷绕在肘部。观察该肘部弯曲5分钟后的状态，通过以下标准进行评价。
肘部和膜之间不存在间隙的情况：○
膜完全伸长，因此肘部和膜之间存在间隙的情况：×
[实施例1]
将140重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)、200重量份的碳酸钙(平均粒径＝1.1μm)、1重量份的硬脂酸和1重量份的抗氧化剂在180℃下熔融混炼以提供混合材料。
将得到的混合材料投入挤出机中，并从其T模头熔融挤出。将挤出的材料通过单轴辊拉伸方式在拉伸温度60℃和拉伸倍率4倍下沿其长度(MD)方向拉伸，从而提供厚度为100μm的伸缩性多孔膜(1)。
结果示于表1。
[实施例2]
除了使用98重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)和42重量份的线性低密度聚乙烯(Prime Polymer Co.,Ltd.制造，商品名：ULTZEX2022L，密度＝0.919g/cm3，MFR＝2g/10min)代替140重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)以外，以与实施例1相同的方式得到厚度为100μm的伸缩性多孔膜(2)。
结果示于表1。
[实施例3]
除了使用77重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)和63重量份的线性低密度聚乙烯(Prime Polymer Co.,Ltd.制造，商品名：ULTZEX2022L，密度＝0.919g/cm3，MFR＝2g/10min)代替140重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)以外，以与实施例1相同的方式得到厚度为100μm的伸缩性多孔膜(3)。
结果示于表1。
[比较例1]
除了使用63重量份的线性低密度聚乙烯(Prime Polymer Co.,Ltd.制造，商品名：ULTZEX 2022L，密度＝0.919g/cm3，MFR＝2g/10min)和77重量份的乙烯-丙烯三元共聚物(Mitsui Chemicals,Inc.制造，商品名：K-9720，MFR＝2g/10min)代替140重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)以外，以与实施例1相同的方式得到厚度为100μm的伸缩性多孔膜(C1)。
结果示于表2。
[比较例2]
除了使用63重量份的线性低密度聚乙烯(Prime Polymer Co.,Ltd.制造，商品名：ULTZEX 2022L，密度＝0.919g/cm3，MFR＝2g/10min)和77重量份的α-烯烃共聚物(MitsuiChemicals,Inc.制造，商品名：Tafmer PN-3560，MFR＝6g/10min)代替140重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)以外，以与实施例1相同的方式得到厚度为100μm的伸缩性多孔膜(C2)。
结果示于表2。
[比较例3]
除了使用98重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 6202，密度＝0.863g/cm3，MFR＝20g/10min)和42重量份的线性低密度聚乙烯(Prime Polymer Co.,Ltd.制造，商品名：ULTZEX2022L，密度＝0.919g/cm3，MFR＝2g/10min)代替140重量份的茂金属聚丙烯系弹性体(Exxon Mobil Corporation制造，商品名：Vistamaxx 7010，密度＝0.861g/cm3，MFR＝3g/10min)以外，以与实施例1相同的方式得到厚度为100μm的伸缩性多孔膜(C3)。
结果示于表2。
在制造伸缩性多孔膜(C3)时，用于伸缩性多孔膜的材料对辊的粘附非常强，使得制造不容易。
表1
表2
产业上的可利用性
本发明的伸缩性多孔膜能够用于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多孔膜。这样的制品的典型实例是橡皮膏。
附图标记列表
10 聚合物组分
20 填料
30 空隙
100 伸缩性多孔膜

Claims (20)

1.一种伸缩性多孔膜，所述伸缩性多孔膜在其表面具有空隙，其中：
所述伸缩性多孔膜使用王研式透气度计测定的透气度小于99,999sec/100cc；
所述伸缩性多孔膜具有在所述伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于60,000sec/100cc的伸长方向；和
所述伸缩性多孔膜具有在滞后试验中，将所述伸缩性多孔膜从宽度20mm和卡盘间距30mm以牵引速度50mm/min牵引至卡盘间距60mm并保持1分钟、然后释放卡盘间距的牵引时的残余应变为10mm以下的牵引方向。
2.根据权利要求1所述的伸缩性多孔膜，其中使用王研式透气度计测定的透气度小于60,000sec/100cc。
3.根据权利要求2所述的伸缩性多孔膜，其中使用王研式透气度计测定的透气度小于40,000sec/100cc。
4.根据权利要求1所述的伸缩性多孔膜，其中在所述伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于30,000sec/100cc。
5.根据权利要求4所述的伸缩性多孔膜，其中在所述伸缩性多孔膜100％伸长状态下使用王研式透气度计测定的透气度小于5,000sec/100cc。
6.根据权利要求1所述的伸缩性多孔膜，其中所述残余应变为8mm～1mm。
7.根据权利要求6所述的伸缩性多孔膜，其中所述残余应变为6mm～2mm。
8.根据权利要求1所述的伸缩性多孔膜，其中所述伸缩性多孔膜的厚度为30μm～300μm。
9.根据权利要求8所述的伸缩性多孔膜，其中所述伸缩性多孔膜的厚度为50μm～150μm。
10.根据权利要求1所述的伸缩性多孔膜，其中所述伸缩性多孔膜包括聚合物组分和填料。
11.根据权利要求10所述的伸缩性多孔膜，其中所述聚合物组分含有丙烯系弹性体。
12.根据权利要求11所述的伸缩性多孔膜，其中所述聚合物组分中的所述丙烯系弹性体的含量为30重量％～100重量％。
13.根据权利要求11所述的伸缩性多孔膜，其中所述丙烯系弹性体的MFR为0.1g/10min～18g/10min。
14.根据权利要求13所述的伸缩性多孔膜，其中所述丙烯系弹性体的MFR为2g/10min～5g/10min。
15.根据权利要求11所述的伸缩性多孔膜，其中所述丙烯系弹性体包含茂金属系弹性体。
16.根据权利要求10所述的伸缩性多孔膜，其中所述聚合物组分含有线性低密度聚乙烯。
17.根据权利要求16所述的伸缩性多孔膜，其中所述聚合物组分中的所述线性低密度聚乙烯的含量为5重量％～60重量％。
18.根据权利要求10所述的伸缩性多孔膜，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。
19.一种制品，其包含根据权利要求1所述的伸缩性多孔膜。
20.根据权利要求19所述的制品，进一步包含压敏粘合剂层。
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