CN104943309B - 多层收缩膜,由其制备的标签和它们的用途 - Google Patents
多层收缩膜,由其制备的标签和它们的用途 Download PDFInfo
- Publication number
- CN104943309B CN104943309B CN201510399225.3A CN201510399225A CN104943309B CN 104943309 B CN104943309 B CN 104943309B CN 201510399225 A CN201510399225 A CN 201510399225A CN 104943309 B CN104943309 B CN 104943309B
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- Prior art keywords
- film
- heat shrinkable
- multilayer heat
- shrinkable film
- coc
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- 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.)
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Classifications
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Abstract
一种多层热收缩膜,包含芯层和至少一个包含环烯烃共聚物(COC)的表层,所述芯层包括一种或多种α‑烯烃聚合物;及其制备方法和用途。
Description
相关申请的交叉参考
本申请是中国专利申请200980141924.0的分案申请。本申请要求2008年10月24日提交的U.S.临时申请系列No.61/108,379的优先权,其内容在此全文引入作为参考。
发明领域
本公开内容涉及包含至少一个芯层和至少一个表层的多层收缩膜,所述芯层包含α-烯烃聚合物和所述表层包含环烯烃聚合物。更具体地,本公开内容涉及由这些膜制备的标签,特别地其上滚动其上收缩(roll-on-shrink-on)标签,以及涉及这些膜和标签在包装中的用途。
发明背景
收缩标签代表标记应用的较高部分。由于使用为了高客户诉求具有360°图形的顺形容器和收缩套管标签的趋向,高收缩标签是标记商业中成长最快的区段。
将热量施加到顺形容器周围的收缩标签使得标签优先在容器周围以周边方式延伸的方向中收缩以符合外部容器形状。
收缩标签属于两个类别:其上滚动其上收缩(ROSO)标签和套管标签。将ROSO标签从卷轴供应,切割成片材,使用热熔体施加在容器周围以形成接缝,及膜的纵向(MD)在容器周围以周边方式延伸。ROSO标签膜主要在MD方向中收缩。ROSO标签通常采用双轴取向聚丙烯(BOPP)膜。
相反地将套管标签从布置在容器周围的管子供应,及膜的横向(TD)在容器周围以周边方式延伸。套管标签主要在TD方向中收缩。
ROSO标签优于套管标签,这是由于套管标签较昂贵,原因在于它们需要在另外的步骤中缝合成管子,而ROSO标签在标签步骤期间在容器周围缝合。在容器周围另外施加ROSO标签是比套管标签施加更快的工艺。
目前的高收缩套管标签是由TD收缩膜制成的套管,将其溶剂缝合成折叠管。这些高收缩标签提供多于60%的收缩和通常由如下物质制成:聚氯乙烯(PVC)、聚对苯二甲酸乙二醇酯(PET)、聚对苯二甲酸乙二醇酯二醇(PETG)或取向聚苯乙烯(OPS)。由于该膜的密度高于1kg/dm3,PVC和PET标签不容易与PET瓶子薄片在循环工艺中使用浮选技术分离。由于高自然收缩现象,OPS膜要求在受控条件下运输和贮存。自然收缩是在仓库中贮存温度下逐渐发生的收缩现象,和它在辊形式中引起变形问题。
尽管ROSO标签提供成本优点,套管标签在可以获得的收缩百分比程度中享有优点。套管标签典型地在容器周边收缩至多60-70%,而商业ROSO膜仅仅收缩至多20%。
考虑到ROSO标签的成本优点,需要识别适于ROSO标记的聚烯烃基膜,它可以在容器周围收缩到比目前BOPP ROSO标签更大的程度,可以在蒸汽隧道中收缩用于高的热量效率,和具有低自然收缩和可以容易地与PET薄片分离而用于再循环。在收缩之后的清晰性是另一个所需的性能,这是由于透明标签可以反向印刷以保证消费者通过标签看到印刷部分。
WO2006/071826公开了含有芯层和表层的多层热收缩膜,该芯层包含(i)至少一种聚萜烯和(i i)间规聚丙烯或环烯烃共聚物(COC)的共混物,该表层包含一种或多种在135℃下的最终收缩为至少25%的聚烯烃。这些膜受限于低的稳定性和刚度。
EP 1632343公开了由至少三个层构成的多层可热收缩膜,其包含由树脂组合物制成的表层,该树脂组合物包含55-95质量%环烯烃系树脂和45-5质量%线性低密度聚乙烯,和由树脂组合物制成的中间层,所述树脂组合物包含95-55质量%丙烯-α-烯烃无规共聚物和5-45质量%环烯烃系树脂。这些膜的密度和成本较高。
现在已经发现通过结合聚烯烃芯层与一个或多个包含环烯烃共聚物(COC)的表层,获得的膜提供高收缩比,良好的操作性能,光学和刚度。也已经发现在聚烯烃芯层上共挤出COC表层,和将复合膜MD单轴取向,导致在TD中容易撕裂的膜,它是用于切割标签的优点。最后根据本公开内容的多层膜特别适于生产容易与PET容器分离的ROSO标签。
发明概述
因此,在一些实施方案中,本公开内容涉及多层热收缩膜,该多层热收缩膜包含芯层和至少一个表层,该芯层包含一种或多种α-烯烃聚合物和该表层包含一种或多种环烯烃聚合物。
在其它实施方案中,本公开内容涉及包含一个芯层和两个表层的三层膜。
本申请还进一步涉及如下实施方案:
1.一种多层热收缩膜,包含:
(a)芯层,所述芯层包含α-烯烃聚合物和小于5wt.%环烯烃共聚物(COC),基于所述芯层中聚合物的总重量;
(b)至少一个包含环烯烃共聚物(COC)的表层。
2.实施方案1的膜,包含一个芯层和两个包含环烯烃共聚物的表层。
3.实施方案1或2的膜,其中所述芯层包括一种或多种丙烯系弹性体、一种或多种丙烯和乙烯的金属茂催化的共聚物、一种或多种乙烯塑性体、一种或多种金属茂催化的线性低密度聚乙烯的α-烯烃聚合物及其组合。
4.实施方案1-3任一项的膜,其中所述COC选自乙烯或丙烯与环烯烃如降冰片烯或降冰片烯衍生物和或四环十二碳烯衍生物的无规共聚物。
5.实施方案4的膜,其中所述COC的玻璃化转变温度为70-80℃。
6.实施方案1-5任一项的膜,其中每个表层包含至少50wt.%的COC。
7.实施方案1-6任一项的膜,其中该膜仅仅在纵向中单轴取向。
8.实施方案1-7任一项的膜,由三层膜组成,所述三层膜在纵向中单取向和包含芯层和两个表层,所述芯层包含至少90wt.%选自丙烯系弹性体、丙烯和乙烯的金属茂催化的共聚物、乙烯塑性体和金属茂催化的线性低密度聚乙烯的α-烯烃聚合物,所述表层包含至少90wt.%玻璃化转变温度为70-80℃的COC。
9.通过经流延模头的共挤出和在纵向中的单轴取向制备实施方案1-8任一项的膜的方法。
10.通过经流延模头的共挤出和使用同时拉伸工艺的双轴取向制备实施方案1-8任一项的膜的方法。
11.通过经环形模头的共挤出制备实施方案1-8任一项的膜的方法。
12.实施方案1的膜在包装和/或标记中的用途。
13.标签,包含实施方案1-8任一项的膜。
详细描述
各种具体的实施方案,变型和实施例在此描述,包括例示的实施方案和用于理解所要求的本发明的定义。尽管以下的详细描述给出了具体的优选实施方案,本领域技术人员会认识到这些实施方案仅仅是例示的,和认识到本发明可以采用各种方式实施。为了确定侵权的目的,本发明的范围将参考一个或多个所附的权利要求,包括它们的等同物,和等同于所述的那些的要素或限定。对"本发明"的任何提及可以参考由权利要求定义的一个或多个,但不必须是全部的发明。
本文使用的"聚合物"可以用于表示均聚物、共聚物、互聚物、三元共聚物等。
本文使用的术语"COC"表示乙烯或丙烯和环烯烃的无规共聚物。环烯烃的实例是降冰片烯和/或其衍生物、和/或四环十二碳烯和/或其衍生物。
芯层
如上所述,芯层包含一种或多种α-烯烃聚合物。用于芯层的α-烯烃聚合物优选具有通过差示扫描量热计(DSC)测量的60℃至125℃,更优选60℃至100℃的熔点。用于芯层的α-烯烃聚合物通常包括丙烯和乙烯均聚物及其共聚物和组合。芯层包括以下定义的丙烯系弹性体,丙烯和乙烯的金属茂催化的共聚物,乙烯塑性体,金属茂催化的线性低密度聚乙烯和其组合。
丙烯系弹性体
丙烯系弹性体的熔化热(Hf)小于或等于75J/g和通过13C NMR测量的三个丙烯单元的三单元组立构规整度为75%或更大,或甚至90%或更大。下降的Hf可来自立体-或区域误差和/或来自引入一个或多个衍生自C2或C4-C20α-烯烃的共聚单体的单元和任选地二烯烃衍生的单元。这些丙烯-α-烯烃弹性体可包含6-25wt.%的α-烯烃和更优选多于7wt.%的α-烯烃。包含8-12wt.%乙烯的聚丙烯系弹性体是特别合适的。
丙烯系弹性体通过DSC测定的峰值熔点可以小于105℃或小于130℃,例如当存在少量更高熔点级分时。三单元组立构规整度根据在US-A-20040236042中公开的方法测定。丙烯-α-烯烃弹性体可具有大于或等于0.5J/g和优选小于或等于约50J/g的Hf。Hf使用ASTME-794-95(版本E-794-01)测定。优选的丙烯-α-烯烃弹性体根据ASTM D1646测定的门尼粘度[ML(1+4)@125℃]小于100,优选小于60或小于30。丙烯-α-烯烃弹性体通过凝胶渗透色谱(GPC)测定的分子量分布指数(Mw/Mn))可以为1.8-3。丙烯系弹性体可以通过不同类型的单活性点催化剂如桥联金属茂(参见WO 1999/07788),吡啶胺(参见WO03/040201)和未桥联金属茂(参见US5969070),优选在溶液工艺中制备。根据本公开内容可以使用的丙烯系弹性体可以从ExxonMobil Chemical Company以商品名Vis tamaxxTM购得。这些材料中的一些进一步可以从Dow Chemical Company以商品名VersifyTM购得。
金属茂催化的共聚物
丙烯和乙烯的金属茂催化的共聚物在溶液、淤浆或气相条件中使用通过对于这些组分公知的方法活化的单活性点催化剂,例如采用铝氧烷或非配位阴离子活化而制备。丙烯和乙烯的金属茂催化的共聚物优选是包含2-6wt.%乙烯的丙烯和乙烯的共聚物。由DSC测定的峰值熔点是110-135℃,优选120-130℃。通过GPC测定的Mw/Mn可以为1-3。
乙烯系塑性体
用于本公开内容的乙烯系塑性体是根据ASTM D1505测定的密度为0.85g/cm3至0.91g/cm3的非常低密度聚乙烯(VLDPE)。乙烯系塑性体包含足够数量的衍生自C3至C10共聚单体,优选C4至C8α-烯烃的单元以尤其,达到要求的密度。乙烯系塑性体优选在溶液中或在高压条件下使用单活性点催化剂如双环戊二烯基或单环戊二烯基金属茂生产。
这样的塑性体由ExxonMobil Chemical Company以商品名ExactTM商业化,由Dow以商品名Affini tyTM商业化和由Mi tsui以商品名TafmerTM商业化。
金属茂催化的线性低密度聚乙烯
在LLDPE中,金属茂线性低密度聚乙烯(LLDPE)根据ASTM D 1505测定的密度为0.91g/cm3至0.94g/cm3。它们可以在溶液、淤浆或气相条件中使用单活性点催化剂,如通过对于这些组分公知的方法活化的金属茂,例如采用铝氧烷或非配位阴离子活化而制备。低熔融指数比线性聚乙烯聚合物是具有剪切敏感性的线性聚乙烯,该剪切敏感性表达为通过ASTM-1238(2.16kg和21.6kg在190℃)测定的小于30的熔融指数比I21.6/I2.16比例(MIR)。低的MIR指示没有长支链或长支链水平较低以及具有窄分子量分布。高MIR线性聚乙烯包括MIR大于30的LLDPE,其与相对低Mw/Mn值的结合通常被接受为指示长链支化的存在。这些聚合物可以称为"均匀支化的线性聚乙烯"。该支链相信在结构中是线性的和存在的水平可以使得没有峰可以具体地在13C NMR光谱中归于这样的长支链。
金属茂LLDPE可以由ExxonMobil Chemical Company以商品名ExceedTM和EnableTM商业化和由Dow Chemical Company以商品名EliteTM商业化。
在实施方案中,包括丙烯系弹性体如VistamaxxTM和乙烯系塑性体如ExactTM的芯层提供改进的收缩性能。
在一些实施方案中,芯层包括至少80wt.%,优选至少90wt.%,更优选至少95wt.%,和最优选至少98wt.%芯层中存在的α-烯烃聚合物。
芯层可包含小于5wt.%,优选小于2wt.%,更优选小于0.5wt.%以下定义的环烯烃共聚物(COC),基于芯层中存在的聚合物。优选芯层不含COC。
设想芯层可包含其它聚合物如PETG,PET,聚乳酸(PLA),PVC,聚苯乙烯(PS)或其组合。然而通常将这些聚合物从根据本公开内容的芯层排除。
芯层可包含其它添加剂如无机填料,颜料,抗氧化剂,酸清除剂,紫外线吸收剂,加工助剂如硬脂酸锌,挤出助剂,爽滑添加剂,渗透性改进剂,抗静电添加剂,穴化剂如碳酸钙和β-成核剂。这些添加剂可以采用在聚烯烃中,典型地在低密度聚乙烯(LDPE)中的母料形式引入芯层中。LDPE可用于改进线性聚合物的熔体强度和当在吹制生产线上生产膜时改进气泡稳定性。
芯层优选构成本公开内容的多层膜的20-90%,更优选30-90wt.%,仍然更优选50-85wt.%和甚至更优选50-70wt.%。由于商业的原因,芯层通常构成本发明多层膜的70-85wt.%。
表层
本公开内容的多层膜也包含至少一个表层,该表层优选包含至少一种环烯烃共聚物(COC)。优选,该膜包含两个表层,每个包含至少一种COC。
用于本公开内容的COC是乙烯或丙烯和环烯烃,如降冰片烯和/或其衍生物,和/或四环十二碳烯和/或其衍生物的无规共聚物。COC的玻璃化转变温度通常为6O℃至120℃,更优选70℃至80℃。在260℃下采用2.16kg根据ISO 113测量的材料的体积流动速率(MVR)优选为1-60ml/10min,优选20-50ml/10min。COC根据ISO 1183的密度优选为1.00-1.06g/dm3。通过GPC测量的数均分子量典型地为1,000-1,000,000。根据本公开内容有用的COC可以从Ticona以注册商品名商购或从Zeon Chemicals以注册商品名商购。
在实施方案中,表层包含至少55wt.%,优选至少75wt.%每个表层中存在的聚合物,优选至少90wt.%的COC,基于在表层中所有聚合物的重量。除COC以外,表层也可以包含采用较小数量的其它成膜聚合物树脂,通常小于每个表层中存在的聚合物的45wt.%。基于其它聚合物树脂小于25wt.%,优选小于10wt.%的数量是合适的。这些聚合物树脂包括丙烯和乙烯均聚物和共聚物以及它们的组合。
表层也可以有利地包含其它添加剂如颜料,抗氧化剂,酸清除剂,紫外线吸收剂,加工助剂如硬脂酸锌,挤出助剂,防粘连剂,爽滑添加剂或抗静电添加剂。
表层可构成本公开内容多层膜的10-80wt.%,优选10-70wt.%和更优选15-50wt.%和甚至更优选30-50wt.%。由于经济原因,表层通过构成本发明多层膜的15-30wt.%。
表层可以从不同聚合物或由相同聚合物采用不同或相同的比例制备。更优选根据本公开内容的膜具有相同聚合物配置和聚合物组成比例的两个表层。
本公开内容的多层膜可任选地包含一个或多个结合层。结合层可以有益地有助于保证在表层和芯层之间的粘合。结合层,如果存在的话,将优选构成整个多层膜的5wt.%至15wt.%。
在一些实施方案中,本公开内容的多层膜不包含结合层。
本公开内容的膜可以通过本领域已知的措施制备。该膜可以通过经流延模头或环形模头的共挤出制备。
该膜包含两个或多个层和典型地具有厚度5-300μm,优选10-150μm。厚度为20-90μm的膜是根据本公开内容特别合适的。
如上所讨论的那样该膜可以优先单轴或双轴取向。在一个实施方案中,该膜是单轴取向的。单轴取向膜仅仅在一个方向中拉伸。根据本公开内容的膜优选在MD方向中单轴取向。
不希望受限于任何理论,在MD中单轴取向的流延膜得到最优选的收缩性能而吹制膜可产生具有良好收缩性能的膜。吹制膜的MD取向进一步改进收缩性能和降低膜收缩的温度。
纵向(MD)取向通过如本领域已知的将膜拉伸而完成。
根据本公开内容的膜也可以在U.S.6908687中描述的LISIM生产线上生产。
在优选的实施方案中,将挤出的膜仅仅在纵向中,在WO2006/071826中描述的单阶段工艺中拉伸。在单阶段拉伸工艺中拉伸的多层膜典型地具有约2-约7,优选约2-约3的拉伸比。
在另一个实施方案中,使用两阶段拉伸工艺将挤出的片材单轴拉伸,其中将挤出的片材在纵向中拉伸两次,如在WO2006/71826中所述。在第一拉伸辊之间的拉伸比通常是约1-5,和在第二拉伸辊之间的拉伸比通常是1-2。
在优选的实施方案中,本公开内容的多层膜是三层膜,所述三层膜在横向中单取向,具有芯层和两个表层,所述芯层包含至少90wt.%一种或多种α-烯烃聚合物,其选自丙烯系弹性体、丙烯和乙烯的金属茂催化的共聚物、乙烯塑性体和金属茂催化的线性低密度聚乙烯,该表层包含至少90wt.%玻璃化转变温度为70-80℃的COC。
可以将该膜经历另外的工艺,如电晕和/或等离子体处理,火焰处理,通过真空金属化的金属化,如需要施加可印刷顶涂层以增强标签的装饰本质,层压或保护涂层如瓷漆。
当在水浴中在60-100℃的温度下放置10秒期间或在烘箱中在60℃至150℃,典型地70℃至135℃的温度下放置7分钟期间时,本公开内容的多层热收缩膜在取向方向中具有典型地20%或更大,优选30%或更大,更优选40%或更大的收缩。通过测量在测试(ASTM1204)之前和之后样品长度的差异而确定收缩。优选本公开内容的多层热收缩膜在正常收缩标签应用温度(例如60℃至150℃,典型地70℃至135℃)下小于95%的收缩。
在其中膜标签在其周围的产品的非模糊观察的应用中,需要清晰性(特别地接触清晰性)和透明性。高清晰性和透明性对于标签的"反向"印刷部分也是所需的,其中印刷部分位于标签和容器之间及消费者通过标签观察印刷部分。
典型地,本公开内容的膜在50μm的膜厚度下具有的透明性数值为10或更多,优选15或更多,更优选20或更多。透明性根据ASTM方法D-1746测定。
根据本公开内容的膜的雾度值可取决于应用而变化。当应用要求高清晰性和低雾度时,在膜厚度50μm下根据ASTM方法D-1003测定的雾度值是20%或更小,优选小于15%,更优选10%或更小。
本公开内容的多层膜的刚度通过使用Handle O Meter根据ASTM D2923-70测量和以g/15mm提供。根据本公开内容在取向方向中的刚度是至少25g/15mm,优选至少30g/15mm。容易获得35-45的数值。因此根据本公开内容的取向膜可以在高线速度下用于ROSO工艺。
拉伸强度根据ASTM D882测量和以N/mm2提供。
根据ASTM D 1505测定的膜密度优选低于0.96g/dm3。低于0.96的数值可以根据本公开内容获得。这样更低密谋的膜对于在再循环过程期间PET瓶子薄片与标签的容易分离是有用的。
根据本公开内容的膜可用于许多收缩膜应用,所述应用是用于包装制品,该制品非限制性地包括,电池,铝罐容器,气溶胶罐,塑料液体饮料容器,玻璃容器和不规则形状容器。
本公开内容的膜进一步具有作为标签如套管类型标签,如ROSO标签的特定功用。MD取向膜更优选用于ROSO标签。
为了将本公开内容的膜转化成ROSO标签,将该膜优选在膜的一侧上电晕处理,然后在电晕处理的一侧上印刷和切割到所需的宽度优选在印刷之后。印刷可以在膜的"反向"侧上以产生反向印刷的标签。在ROSO标签应用中当膜在容器周围时,膜的反向侧靠着容器和在反向侧上的印刷部分通过膜观察。这些步骤典型地在连续网工艺中通过本领域有用的任何方法进行。
本公开内容的膜和标签也可以有利地具有通过膜或标签的穿孔。穿孔最所需地位于靠近容器最窄部分或多个部分的膜部分,在其周围在ROSO应用中施加该膜。穿孔允许会另外倾向于在标签和容器之间被捕集的气体脱逸,因此允许标签更紧密地符合容器。
COC在表层中存在的益处来自刚度的改进和具有相对薄COC层的膜的收缩表现。
最后令人惊奇地发现相对薄的COC层不仅仅极大地增加在低收缩温度下的收缩百分比,而且在卷状物贮存贮存期间降低自然收缩,它会产生膜的变形和印刷方面的困难。
如下实施例用作本公开内容的说明,以下解释测量的特征和用于它们表达的单位。
实施例
根据本公开内容的实施例1-3,在具有MD取向器的流延生产线上生产。
多层流延膜使用多层流延膜生产线制备。每个共挤出膜具有A/B/A结构,其中A层是包含COC的表层和B层是芯层。
层的组成如下:
表1
其中
每个表层在拉伸之后的厚度为约7.5μm,在取向步骤之前的平均总膜厚度是约125μm。
将共挤出的结构物在急冷辊上冷却和使用由4个预热辊,其中发生拉伸的2个拉伸辊和2个退火辊组成的MDO设备拉伸2.5倍。MDX拉伸比(在MDO设备出口处膜的速度除以在MDO入口处膜的速度)是2.5-6。拉伸的膜的厚度是50μm。
使用如下拉伸条件:
表2
MDX | 预热温度 | 拉伸温度 | 退火温度 | |
实施例1 | 5.0 | 82℃ | 80℃ | 71℃ |
实施例2 | 2.5 | 82℃ | 88℃ | 71℃ |
实施例3 | 2.5 | 82℃ | 88℃ | 71℃ |
这些样品的膜性能见表3,而收缩性能(MD收缩百分比对温度)在表4中。
表3
表4
实施例4
多层膜如在实施例1-3中那样获得,区别在于膜的组成和拉伸条件。
共挤出膜的组成A/B/A是7.5μm8007F-400+1000ppm TospearlTM 145/Equis tar M6030/7.5μm8007F400+1000ppm TospearlTM 145,其中EquistarTMM6030是高密度聚乙烯(HDPE)(密度0.960g/cm3),其根据ASTM 1238(2.16kg,190℃)的熔融指数是3。
将共挤出的结构物在急冷辊上冷却和在如下拉伸条件下拉伸:MDX:2.5,预热温度:82℃,拉伸温度:88℃,和退火温度:71℃。
该膜在收缩之后的雾度是3.8%,在120℃下收缩之后的雾度是19.1%,在MD中的模量是1506和在TD中的模量是1518N/mm2,和在MD中的刚度是37g/15mm和在TD中的刚度是27g/15mm。
根据本公开内容的实施例5-7,在具有MDO的吹制生产线上生产。
在和吹制生产线上使用250mm直径模头,1.4mm模头间隙开口和2.5的吹胀比生产125μm膜。
表5
其中
然后将该膜在Alpine MDO设备上离线拉伸,及拉伸比(MDX)为2.5。
该MDO设备由预热辊(4),其中发生拉伸的拉伸辊(2),退火辊(3)和冷却辊(2)组成。拉伸比是2.5。拉伸的膜的厚度是50μm。
拉伸条件在表6中给出。
表6
实施例5 | 实施例6 | 实施例7 | |
预热温度 | 80℃ | 90℃ | 90℃ |
拉伸温度 | 80℃ | 95℃ | 95℃ |
退火温度 | 75℃ | 75℃ | 75℃ |
冷却温度 | 40℃/20℃ | 40℃/20℃ | 40℃/20℃ |
收缩性能(MD收缩百分比对温度)见表7。
表7
根据本公开内容的实施例8-9,在没有MDO的吹制生产线上生产。
在和吹制生产线上使用250mm直径模头,1.4mm模头间隙开口和2.0的吹胀比生产50μm膜。
表8
该膜不在MDO设备上离线拉伸。
收缩性能(MD收缩百分比对温度)见表9。
表9
说明性实施例中所述的膜已经在Krones Reel Fed标记机器上,使用UV热熔体测试以形成接缝,如在U.S.6,808,822,第13栏,第15-28行所述或使用激光或溶剂以接缝焊接。
将标签在蒸汽或热空气隧道中收缩和在容器轮廓周围符合良好。结果如下:
实施例1-3和5-8的膜提供优异的标签和在收缩之后显示良好的外观,实施例4的膜合适地收缩但在收缩之后显示褶皱或砂眼。
在此引用的所有专利和专利申请,测试程序(如ASTM方法,UL方法等),和其它文献通过参考完全引入到这样的公开内容不与本公开内容不一致的程度和用于其中允许这样的引入的所有管辖权。
当本文中列出数字下限和数字上限时,设想从从任何下限到任何上限的范围。尽管已经特别地描述了本公开内容的说明性实施方案,将要理解各种其它改进对本领域技术人员是显然的和可以容易地由本领域技术人员实现而不背离本公开内容的精神和范围。因此,并不意味着所附权利要求的范围限于本文所述的实施例和描述,但反而将权利要求解释为包括本公开内容中可专利新颖性的所有特征,包括本公开内容涉及的由本领域技术人员处理为其等同物的所有特征。
Claims (20)
1.一种多层热收缩膜,包含:
包含至少80wt%的一种或多种α-烯烃聚合物和第一环烯烃共聚物(COC)的芯层,其中第一COC占芯层的小于5wt%,和其中芯层的α-烯烃聚合物选自包含8-12wt%乙烯的含有乙烯的丙烯系弹性体、密度为0.85g/cm3至0.91g/cm3的乙烯系塑性体、包含2-6wt%乙烯的丙烯和乙烯的金属茂催化的共聚物、金属茂线性低密度聚乙烯及其组合;
包含至少50wt%玻璃化转变温度为6O℃至120℃的第二环烯烃共聚物(COC)的两个表层;
对两个表层中一个的表面进行电晕、等离子体或火焰处理;和
在该多层热收缩膜的纵向上的单轴拉伸以使得该多层热收缩膜在横向上可撕裂。
2.权利要求1的多层热收缩膜,其中第二COC选自乙烯或丙烯与环烯烃的无规共聚物,该环烯烃是降冰片烯、降冰片烯衍生物、四环十二碳烯或四环十二碳烯衍生物。
3.权利要求1的多层热收缩膜,其中第二COC的玻璃化转变温度为7O℃至80℃。
4.权利要求1的多层热收缩膜,其中每个表层包含至少90wt%第二COC。
5.权利要求1的多层热收缩膜,其中第一和第二COC相同。
6.权利要求1的多层热收缩膜,其中两个表层的一个的表面包括印刷物。
7.权利要求1的多层热收缩膜,其中两个表层的一个或两个包括通过膜的穿孔。
8.权利要求1的多层热收缩膜,其雾度值是20%或更小。
9.权利要求1的多层热收缩膜,其在取向方向上的收缩是20%或更大。
10.权利要求1的多层热收缩膜,具有对于标签的观察反向印刷足够的清晰性和透明性。
11.包含权利要求1的多层热收缩膜的标签。
12.一种制备膜的方法,包括:
共挤出至少80wt%的一种或多种α-烯烃聚合物和第一环烯烃共聚物(COC);和包含至少50wt%玻璃化转变温度为6O℃至120℃的第二环烯烃共聚物(COC)的两个表层,以形成共挤出物,其中第一COC占芯层的小于5wt%,和其中芯层的α-烯烃聚合物选自包含8-12wt%乙烯的含有乙烯的丙烯系弹性体、密度为0.85g/cm3至0.91g/cm3的乙烯系塑性体、包含2-6wt%乙烯的丙烯和乙烯的金属茂催化的共聚物、金属茂线性低密度聚乙烯及其组合;和
在纵向上使该膜取向使得该膜在横向上可撕裂;和
通过电晕、等离子体或火焰对两个表层中一个的表面进行处理。
13.权利要求12的方法,进一步包括吹制或流延该共挤出物以形成该膜。
14.权利要求12的方法,其中共挤出通过流延模头或环形模头进行。
15.一种包含柔性包装物的制品,该柔性包装物包含权利要求1的多层热收缩膜。
16.权利要求1的多层热收缩膜的用途。
17.权利要求1的多层热收缩膜,进一步包含在两个表层后处理的至少一个上沉积的至少一个金属化层。
18.权利要求12的方法,进一步包括在该处理之后将两个表层中的一个金属化。
19.权利要求12的方法,进一步包括通过该膜穿孔。
20.权利要求12的方法,进一步包括在该处理之后在表面上印刷。
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- 2009-09-22 EP EP09792811A patent/EP2355978A1/en not_active Withdrawn
- 2009-09-22 CA CA2741447A patent/CA2741447C/en not_active Expired - Fee Related
- 2009-09-22 US US13/120,858 patent/US9695306B2/en not_active Expired - Fee Related
- 2009-09-22 CN CN2009801419240A patent/CN102196908A/zh active Pending
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WO2010047905A1 (en) | 2010-04-29 |
CN104943309A (zh) | 2015-09-30 |
CA2741447C (en) | 2013-10-29 |
US20110212338A1 (en) | 2011-09-01 |
CA2741447A1 (en) | 2010-04-29 |
CN102196908A (zh) | 2011-09-21 |
EP2355978A1 (en) | 2011-08-17 |
US9695306B2 (en) | 2017-07-04 |
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