CN113195217A - 层压结构和合并有其的软包装材料 - Google Patents
层压结构和合并有其的软包装材料 Download PDFInfo
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- CN113195217A CN113195217A CN201880100218.0A CN201880100218A CN113195217A CN 113195217 A CN113195217 A CN 113195217A CN 201880100218 A CN201880100218 A CN 201880100218A CN 113195217 A CN113195217 A CN 113195217A
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Abstract
本公开的实施例涉及层压物,所述层压物包括包含基于乙烯的聚合物的单轴定向第一多层膜,其中所述单轴定向第一多层膜的横向上的断裂伸长率百分比与纵向上的断裂伸长率百分比的比率为至少2比1;和粘着于所述单轴定向第一多层膜且包括基于乙烯的聚合物的双轴定向第二多层膜,其中所述双轴定向第二多层膜的纵向上的断裂伸长率百分比与横向上的断裂伸长率百分比的比率为至少2比1。
Description
技术领域
本文所描述的实施例一般涉及层压结构,且更特定地说涉及用于软包装材料的层压结构。
背景技术
包含双轴定向聚丙烯(BOPP)、双轴定向聚酰胺(BOPA)、双轴定向聚对苯二甲酸乙二酯(BOPET)的常规层压结构广泛用于软包装市场以提供平衡性能,如硬度、韧性、密封性。然而,由于对可回收包装的需求增加,因此在市场上需要提供基于单材料的包装。然而,与这些常规层压结构相比常规聚乙烯(PE)膜具有较差机械性能。
因此,需要改良的层压物和用于制备这些层压物的方法,其中所述层压物具有可循环性和机械强度的双重优势。
发明内容
本公开的实施例通过提供具有可循环性和机械强度的层压物来满足那些需要。本发明的层压物结合双轴定向聚乙烯(BOPE)的优势和机械导引定向聚乙烯膜(MDO-PE)膜的优势。MDO/BOPE层压物的机械性能和热性能有利地彼此增强以提供一种结构,所述结构提供所需可循环性且适合用于软包装应用。
具体来说,MDO膜的高横向(MD)硬度和拉伸强度以及横向(CD)上的低硬度和拉伸强度由BOPE膜在MD方向上的低硬度和拉伸强度以及在CD方向上的高硬度和拉伸强度补偿。所得层压膜具有平衡的MD和CD硬度和拉伸强度,以及良好拉伸伸长率,以提供对抗包装弊端(尤其在坠落测试中的包装弊端)的坚固层压物。
根据至少一个层压物实施例,所述层压物包括单轴定向第一多层膜,其包括密度为0.930到0.970g/cc且熔融指数(I2)为0.1到10g/10分钟的基于乙烯的聚合物,其中所述单轴定向第一多层膜以大于3:1且小于8:1的拉伸比在横向上定向,且其中所述单轴定向第一多层膜的横向上的断裂伸长率百分比与纵向上的断裂伸长率百分比的比率为至少2比1。所述层压物还包括双轴定向第二多层膜,其粘着于单轴定向第一多层膜且包括密度为0.900到0.962g/cc的基于乙烯的聚合物,其中双轴定向第二多层膜的横向拉伸比大于其纵向拉伸比,且其中双轴定向第二多层膜的纵向上的断裂伸长率百分比与横向上的断裂伸长率百分比的比率为至少2到1。
这些和其它实施例更详细地描述于以下具体实施方式中。
具体实施方式
现将描述本申请案的具体实施例。然而,本公开可以不同形式实施,且不应解释为限于本公开中所阐述的实施例。相反地,提供这些实施例以使得本公开将透彻且完整,且将向所属领域的技术人员充分传达主题的范围。
定义
术语“聚合物”是指通过使相同或不同类型的单体聚合而制备的聚合化合物。通用术语聚合物因此涵盖术语“均聚物”,其通常用于指由仅一种类型单体制备的聚合物;以及“共聚物”,其是指由两种或更多种不同单体制备的聚合物。如本文所用,术语“互聚物”是指通过使至少两种不同类型的单体聚合而制备的聚合物。因此,通用术语互聚物包含共聚物,和如三聚物的由超过两种不同类型的单体制备的聚合物。
“聚乙烯”或“基于乙烯的聚合物”应意指包括超过50摩尔%的已衍生自乙烯单体的单元的聚合物。此包含聚乙烯均聚物或共聚物(意指衍生自两种或更多种共聚单体的单元)。所属领域中已知的常见聚乙烯形式包含低密度聚乙烯(LDPE);线性低密度聚乙烯(LLDPE);超低密度聚乙烯(ULDPE);极低密度聚乙烯(VLDPE);单点催化线性低密度聚乙烯,包含线性和基本上线性的低密度树脂(m-LLDPE);中密度聚乙烯(MDPE);和高密度聚乙烯(HDPE)。
如本文所用,术语“基于丙烯的聚合物”是指包括聚合形式的聚合物,所述聚合物是指包括超过50摩尔%的已衍生自丙烯单体的单元的聚合物。此包含丙烯均聚物、聚丙烯无规共聚物、抗冲击共聚物聚丙烯、丙烯/α烯烃共聚物和丙烯/α烯烃共聚物。
术语“LDPE”也可称为“高压乙烯聚合物”或“高度分支化聚乙烯”且定义为意指聚合物在高压釜或管式反应器中在高于14,500psi(100MPa)的压力下通过使用自由基引发剂(如过氧化物)部分或完全均聚或共聚合(参见例如US 4,599,392,其以引用的方式并入本文中)。LDPE树脂通常具有在0.916到0.935g/cm3范围内的密度。
术语“LLDPE”包含使用传统齐格勒-纳塔催化剂(Ziegler-Natta catalyst)系统以及单点催化剂(包含(但不限于)双茂金属催化剂(有时称为“m-LLDPE”)和受限几何结构催化剂)制得的树脂,且包含线性、基本上线性或异质聚乙烯共聚物或均聚物。LLDPE比LDPE含有更少长链分支化,且包含基本上线性乙烯聚合物,其进一步定义于美国专利5,272,236、美国专利5,278,272、美国专利5,582,923和美国专利5,733,155中;均质分支化线性乙烯聚合物组合物,如美国专利第3,645,992号中的那些;非均质分支化乙烯聚合物,如根据公开于美国专利第4,076,698号中的方法制备的那些;和/或其掺合物(如公开于US 3,914,342或US 5,854,045中的那些)。LLDPE可经由气相、溶液相或浆液聚合或其任何组合,使用本领域中已知的任何类型的反应器或反应器配置制得。
术语“MDPE”是指密度为0.926到0.935g/cm3的聚乙烯。“MDPE”通常使用铬或齐格勒-纳塔催化剂或使用单点催化剂(包含(但不限于)双茂金属催化剂和受限几何结构催化剂)制得,且通常具有大于2.5的分子量分布(“MWD”)。
术语“HDPE”是指密度大于约0.935g/cm3的聚乙烯,其一般用齐格勒-纳塔催化剂、铬催化剂或单点催化剂(包含(但不限于)双茂金属催化剂和受限几何结构催化剂)制备。
如本文所用,术语“单材料”意指层压结构基本上由聚乙烯组成,其中“基本上”意指按层压结构的总重量计,至少95wt%的聚乙烯,或至少99wt%的聚乙烯,或至少99.5wt%的聚乙烯,或至少99.9wt%。
“多层结构”意指具有超过一个层的任何结构。举例来说,多层结构可具有两个、三个、四个、五个或更多个层。多层结构可描述为具有以字母指定的层。举例来说,具有核心层B和两个外部层A和C的三层结构可指定为A/B/C。
术语“软包装”或“软包装材料”涵盖所属领域的技术人员熟悉的各种非硬质容器。这些非硬质容器可包含小袋、直立式小袋、枕袋式小袋、散装袋、预制包装等。软包装的一些典型最终用途应用是用于点心、干食品、液体或乳酪包装。其它最终用途应用包含(但不限于)宠物食品、零食、芯片、冷冻食品、肉类、热狗和许多其它应用。
术语“包括(comprising)”、“包含(including)”、“具有(having)”和其衍生词并不打算排除任何额外组分、步骤或程序的存在,无论其是否特定地公开。为避免任何疑问,除非相反陈述,否则经由使用术语“包括”所要求保护的所有组合物均可包含任何额外添加剂、佐剂或化合物,无论聚合或以其它方式。相比之下,术语“基本上由……组成”从任何随后列举的范围中排除任何其它组分、步骤或程序,除了对可操作性来说并非必不可少的那些之外。术语“由……组成”排除并未特定叙述或列出的任何组分、步骤或程序。
现将详细参考本公开的层压结构实施例,特定地说用于柔性包装材料的层压结构。
实施例涉及层压物,其包括单轴定向第一多层薄膜,所述第一多层薄膜包括密度为0.900到0.962g/cm3且熔融指数(I2)为0.1到10g/10分钟的基于乙烯的聚合物。单轴定向第一多层膜(其在本文中也可称为MDO膜或MDO-PE膜)以大于1:1且小于8:1的拉伸比在纵向上定向。此外,单轴定向第一多层膜的横向上的断裂伸长率百分比与纵向上的断裂伸长率百分比之比为至少2比1。
另外,所述层压物包括粘着到所述单轴定向第一多层膜的双轴定向第二多层膜。层压物包括密度为0.900到0.962g/cm3的基于乙烯的聚合物。双轴定向第二多层膜的横向拉伸比大于其纵向拉伸比,且双轴定向第二多层膜具有其中纵向上的断裂伸长率百分比与横向上的断裂伸长率百分比的比率为至少2比1。
单轴定向第一多层膜
在一个或多个实施例中,单轴定向第一多层膜在至少一个层中可包含HDPE以便在热封期间为层压物提供耐热性。在一个或多个实施例中,单轴定向第一多层膜包括至少10wt%的HDPE,或至少15wt%的HDPE,或至少20wt%的HDPE。单轴定向第一多层薄膜可包括95wt%基于乙烯的聚合物,或99wt%基于乙烯的聚合物,或99.9wt%基于乙烯的聚合物,或100wt%基于乙烯的聚合物。单轴定向第一多层膜的高密度聚乙烯的密度可为至少0.950g/cc、或至少0.950g/cc、或至少0.960g/cc。在其它实施例中,高密度聚乙烯的密度可为0.950到0.975g/cc,或0.955到0.970g/cc。此外,高密度聚乙烯的熔融指数可为0.5到2g/10分钟、或0.6到1g/10分钟。商购实例可包含来自密歇根州米德兰市陶氏化学公司(Dow ChemicalCompany)的ELITETM 5960G。
对于单轴定向第一多层膜,考虑各种厚度。在一个实施例中,单轴定向第一多层膜的厚度为15到30μm。
在另一个实施例中,单轴定向第一多层膜可包括至少一个外层,其具有包括至少0.950g/cc的密度和0.3到5g/10分钟的熔融指数(I2)的高密度聚乙烯;至少一个内层,其包括密度小于0.920g/cc且熔融指数为0.5到5g/10分钟的基于乙烯的聚合物;以及至少一个中间层,其安置于至少一个内层与至少一个外层之间,所述中间层包括密度大于0.930g/cc的基于乙烯的聚合物。
外层中的高密度聚乙烯可包含上文所提供的密度范围和熔融指数值。外层的厚度可为2到10μm或2到4μm。
如上所述,至少一个内层包括密度小于0.920g/cc且熔融指数为0.5到5g/10分钟的基于乙烯的聚合物。在一个或多个实施例中,内层可包含密度小于0.900g/cc、或小于0.900g/cc、或小于0.890g/cc、或小于0.880g/cc、或小于0.875g/cc的聚烯烃塑性体。在其它实施例中,内层的聚烯烃塑性体的密度为0.860到0.900g/cc、或0.860到0.885g/cc、或0.865到0.875g/cc。此外,内层的聚烯烃塑性体的熔融指数为0.5到3g/10分钟、或0.6到1.5g/10分钟、或0.8到1.2g/10分钟。聚烯烃塑性体的商购实例可包含AFFINITYTM 8100、AFFINITYTM 8200、AFFINITYTM 1880和AFFINITYTM 1140,其均可购自密歇根州米德兰市陶氏化学公司。
在一些实施例中,例如非嵌段不对称膜实施例,预期内层包括与聚烯烃塑性体掺合的额外基于乙烯的聚合物。涵盖基于乙烯的聚合物的各种实施例。在一个或多个实施例中,内层包括大于0.910g/cc的密度和0.5到5g/10分钟的熔融指数(I2)。适合的商购实例可包含购自密歇根州米德兰市陶氏化学公司的ELITETM或INNATETM聚合物。内层的厚度可为2到10μm或2到5μm。
在单轴定向第一多层膜的中间层中,基于乙烯的聚合物的密度可大于0.930g/cc或大于0.935g/cc。在其它实施例中,基于乙烯的聚合物的密度可为0.920到0.950g/cc,或0.925到0.945g/cc,或0.935到0.945g/cc。此外,中间层的基于乙烯的聚合物的熔融指数可为0.5到2g/10分钟或0.6到1g/10分钟。商购实例可包含来自密歇根州米德兰市陶氏化学公司的ELITETM 5940ST。中间层的厚度可为8到30μm。
在又一实施例中,单轴定向第一多层膜可包含基于丙烯的聚合物。基于丙烯的聚合物可单独使用或与本文所描述的实施例组合使用。基于丙烯的聚合物的密度可为0.850g/cc到0.900g/cc或0.855到0.895。基于丙烯的聚合物的熔体流动速率(MFR)可为1到25、或1到10g/10分钟。预期各种商购实施例为合适的。这些实施例可包含VistamaxxTM3000、VistamaxxTM 3020FL、VistamaxxTM 3588FL和VistamaxxTM 6102/6102FL,其由埃克森美孚(ExxonMobil)生产。另外,也可利用来自密歇根州米德兰市陶氏化学公司的VERSIFYTM2000和VERSIFYTM 2300。
认为各种处理参数适合于在纵向上拉伸。举例来说,单轴定向第一多层膜可以大于3:1且小于8:1的拉伸比或以4:1到8:1的拉伸比在纵向上定向。
如上所述,单轴定向第一多层膜的横向上的断裂伸长率百分比与纵向上的断裂伸长率百分比的比率为至少2比1。在其它实施例中,对于单轴定向第一多层膜,横向上的断裂伸长率百分比与纵向上的断裂伸长率百分比的比率为至少3比1、或至少5比1、或至少8比1。换句话说,单轴定向第一多层膜的横向上的断裂伸长率百分比比纵向上的断裂伸长率百分比大至少100%,或大至少200%,或大至少300%。
双轴定向第二多层膜
预期双轴定向第二多层膜可为单层膜或多层膜。举例来说,双轴定向第二多层膜可进一步包括通常视应用而定包含于多层膜中的其它层,包含例如密封层、阻挡层、连接层、其它聚乙烯层等。在一个或多个实施例中,双轴定向第二多层膜的厚度可为15到100μm或15到40μm。双轴定向第二多层膜可包含95wt%基于乙烯的聚合物、或99wt%基于乙烯的聚合物、或99.9wt%基于乙烯的聚合物、或100wt%基于乙烯的聚合物。
双轴定向第二多层膜的基于乙烯的聚合物的密度可为0.915到0.940g/cc、或0.920到0.935g/cc、或0.920到0.930g/cc。双轴定向第二多层膜的熔融指数可为0.5到2g/10分钟、或0.6到1g/10分钟。
双轴定向第二多层膜可包括线性低密度聚乙烯(LLDPE)。适合的LLDPE包含齐格勒-纳塔催化的线性低密度聚乙烯、单点催化(包含金属茂)的线性低密度聚乙烯(mLLDPE)和中密度聚乙烯(MDPE)(只要MDPE的密度不超过0.940g/cm3即可)以及前述的两种或更多种的组合。LLDPE的密度和熔融指数(I2)可如以上范围所定义。双轴定向第二多层膜可包括在一些实施例中大于50wt%的LLDPE,在其它实施例中大于60wt%且在其它实施例中大于70wt%的LLDPE。
在一些实施例中,双轴定向第二多层膜可进一步包括一种或多种额外聚合物,包含例如高密度聚乙烯、低密度聚乙烯、超低密度聚乙烯、聚乙烯塑性体、聚乙烯弹性体、乙烯乙酸乙烯酯或其组合。在这些实施例中,一种或多种额外聚合物可以小于50wt%的量存在。
双轴定向聚乙烯膜可进一步包括如所属领域的技术人员已知的一种或多种添加剂,如(例如)抗氧化剂、亚磷酸盐、附着添加剂、抗静电剂、颜料、着色剂、填充剂或其组合。
在一个或多个实施例中,双轴定向第二多层膜使用拉幅机依序双轴定向方法来双轴定向。这些技术一般为所属领域的技术人员已知。在其它实施例中,聚乙烯膜可基于本文中的教示使用所属领域的技术人员已知的其它技术(如双气泡定向方法)来双轴定向。一般来说,在拉幅机依序双轴定向方法的情况下,拉幅机作为多层共挤压生产线的部分并入。在从平口模挤压之后,使膜在冷却卷筒上冷却,且浸入填充有室温水的水浴中。随后将铸造膜传递到具有不同旋转速度的一系列卷筒上以实现纵向拉伸。在制造生产线的MD拉伸区段中存在若干对卷筒,且均经油加热。成对卷筒依序作为经预加热卷筒、拉伸卷筒和用于松弛和退火的卷筒工作。各对卷筒的温度单独受控。在纵向拉伸之后,将膜幅材传递到具有加热区的拉幅机热空气烘箱中以进行横向拉伸。最先的若干区用于预加热,后接用于拉伸的区,且随后最终区用于退火。
在一些实施例中,双轴定向第二多层膜在纵向上以2:1到6:1的拉伸比以及在横向上以2:1到9:1的拉伸比定向。在一些实施例中,双轴定向第二多层膜在纵向上以3:1到5:1的拉伸比以及在横向上以3:1到8:1的拉伸比定向。
双轴定向第二多层膜的横向拉伸比大于其纵向拉伸比,且双轴定向第二多层膜具有其中纵向上的断裂伸长率百分比与横向上的断裂伸长率百分比的比率为至少2到1。在其它实施例中,双轴定向第二多层膜的纵向的断裂伸长率百分比与横向的断裂伸长率百分比的比率为至少3比1,或至少4比1。换句话说,其中双轴定向第二多层膜在纵向的断裂伸长率百分比比在横向的断裂伸长率百分比大至少100%,或大至少200%,或大至少300%。
粘着剂层
认为各种粘着剂组合物适合于用于层压物的粘着剂。这些粘着剂可包含聚氨甲酸酯、环氧树脂、丙烯酸等。在一个实施例中,层压物可包括包括聚氨甲酸酯粘着剂的粘着剂层。聚氨甲酸酯粘着剂可为无溶剂或溶剂基的。此外,聚氨甲酸酯粘着剂可为两部分调配物。
层压物
在不受理论限制的情况下,两个膜的组合提供各向同性层压物。如本文所用,“各向同性”意指层压物在横向上的断裂伸长率百分比为在纵向上的断裂伸长率的30%以内。换句话说,此意指层压物在MD方向或横向中产生相似拉伸结果。在进一步实施例中,本发明的层压物在横向上的断裂伸长率百分比可为在纵向上的断裂伸长率百分比的25%以内,或者在20%以内。
制品
如上所述,层压物可包含于软包装材料,如直立小袋中。
测试方法
测试方法包含以下:
熔融指数(I2)
基于乙烯的聚合物的熔融指数(I2)根据ASTM D-1238在190℃下在2.16kg下测量。所述值是以对应于每10分钟溶析的克数的g/10分钟为单位来报道。
熔体流动速率(MFR)
基于丙烯的聚合物的熔体流动速率是根据ASTM D-1238在230℃和在2.16kg下测量。所述值是以对应于每10分钟溶析的克数的g/10分钟为单位来报道。
密度
用于密度测量的样品是根据ASTM D4703来制备且以克/立方厘米(g/cc或g/cm3)为单位来报道。在样品压制一小时内使用ASTM D792方法B进行测量。
拉伸性能
在纵向(MD)和横向(CD)两者上根据ASTM D-882-方法测定伸长率百分比、断裂伸长率和断裂力。所用机器为Instron 5965拉伸测试器,且以500mm/分钟的拉伸速度操作。样品宽度为1英寸。
热封测试
为测定热密封强度和热封起始温度,通过J&B Hot Tack 4000测试仪密封样品。样品宽度为1英寸,密封时间为0.5秒且密封压力为0.275N/mm2。随后,使密封样品老化24小时,随后在Instron 5965拉伸测试器上以500mm/分钟的拉伸速度测试热封强度。
实例
以下实例说明本公开的特征,但不打算限制本公开的范围。
所使用的商购聚合物
下文所列的聚合物用于下文所描述的实验层压物。所有聚合物均由密歇根州米德兰市陶氏化学公司生产。
表1
聚合物 | 密度(g/cc) | 熔融指数(g/10分钟) |
ELITE<sup>TM</sup> 5940ST | 0.941 | 0.85 |
ELITE<sup>TM</sup> 5960G | 0.96 | 0.85 |
AFFINITY<sup>TM</sup> EG 8100G | 0.870 | 1.0 |
ELITE<sup>TM</sup> 5500 | 0.914 | 1.5 |
制造BOPE膜
参考下表2,BOPE样品1和2为来自Decro的商购BOPE产品,尤其用于40μm BOPE样品1的DL40和用于50μm BOPE样品2的DL50。DL40和DL50 BOPE膜具有密度为0.925g/cc的聚乙烯聚合物。
表2
如表2中所示,研究具有各种厚度的这些BOPE样品。数据说明在膜的MD方向上,拉伸曲线相当平坦,展示高断裂伸长率。CD拉伸方向极硬且具有低断裂伸长率。MD和CD拉伸性能的此不对称差异并不益于耐坠落测试。另外,此BOPE膜的耐热性低于所需耐热性,且当在高于130℃下加热膜时可出现收缩。
制造MDO膜
参考下表3,在吹塑膜MDO生产线上以6.5的拉伸比制备MDO膜(MDO样品1)。模具顶部的直径为400mm,产出为448kg/h,且最终卷绕速度为226m/分钟。所使用的吹胀比(BUR)为2.6(拉伸前的平折为1650mm)。第一膜厚度(结块前)为64μm。第二膜厚度(拉伸后)为25μm。(600%拉伸)。模具温度为200℃,除最后两个区域的温度为210℃以外。全部设定为200。
表3
MDO样品1层结构 | 组合物 | 拉伸前厚度(μm) | 拉伸后厚度(μm) |
A | ELITE 5960G | 18 | 3 |
B | ELITE 5940ST | 30 | 5 |
C | AFFINITY 8100G | 12 | 2 |
C | AFFINITY 8100G | 12 | 2 |
B | ELITE 5940ST | 30 | 5 |
A | ELITE 5960G | 18 | 3 |
MDO膜的膜拉伸性能列于下表4中,如所展示,MDO膜CD方向上具有约169.7%的高断裂伸长率,但比MD方向上硬得多。因此,其补偿BOPE膜的拉伸特性。
表4
层压程序
在层压工艺中,在MDO膜上施用粘着剂,其后将第二膜(MDO-PE膜)压在其上,以产生双重层压物。所使用的粘着剂为MOR-FREETM 698A/C79粘着剂,将其以100/50的重量比充分混合,且随后使用乙酸乙酯稀释成固体含量为30%的溶液。随后使用手动刮涂涂布机:KControl Coater 101以1.6g/m2的干涂层重量将粘着剂涂布于A4尺寸MDO膜上。在与BOPE膜层压之前将经涂布的膜在80℃的烘箱中干燥40秒。使用热辊层压机在3巴的夹持压和65℃的夹持点温度下进行人工实验室层压。随后将MDO//BOPE膜的层压膜在45℃下固化24小时。下表5包含双重样品的拉伸性能。
表5
如所展示,MDO与BOPE的组合使得两个双重样品均为各向同性,即将MD方向上的断裂伸长率百分比保持在CD方向上的断裂伸长率百分比的30%以内。实际上,MD方向上的断裂伸长率百分比为CD方向上的断裂伸长率百分比的20%以内。
另外,如表6中所展示,基于热封强度评估表5的双重样品。
表6
如表6中所展示,比较性BOPE膜一般展示比本发明双重层压物更低的密封强度。在低到90℃的温度下,BOPE膜展示收缩,其对于包装应用来说为非常不期望的。相比之下,在与MDO-PE膜层压之后,耐热性提高且本发明双重层压物并不展示任何收缩。
显而易见,在不脱离随附权利要求书中所定义的本公开的范围的情况下可进行修改和改变。更特定地说,尽管本公开的一些方面在本文中鉴别为优选或尤其有利的,但预期本公开不必限于这些方面。
Claims (11)
1.一种层压物,其包括:
单轴定向第一多层膜,其包括密度为0.930到0.970g/cm3且熔融指数(I2)为0.1到10g/10分钟的基于乙烯的聚合物,其中所述单轴定向第一多层膜以大于3:1且小于8:1的拉伸比在纵向上定向,且其中所述单轴定向第一多层膜在横向上的断裂伸长率百分比与在纵向上的断裂伸长率百分比的比率为至少2比1;和
双轴定向第二多层膜,其粘着于所述单轴定向第一多层膜且包括密度为0.900到0.962g/cm3的基于乙烯的聚合物,其中所述双轴定向第二多层膜的横向拉伸比大于其纵向拉伸比,且其中所述双轴定向第二多层膜在纵向上的断裂伸长率百分比与在横向上的断裂伸长率百分比的比率为至少2比1。
2.根据前述权利要求中任一项所述的层压物,其中所述单轴定向第一多层膜在横向上的断裂伸长率百分比比在纵向上的断裂伸长率百分比大至少100%,且其中所述双轴定向第二多层膜在纵向上的断裂伸长率百分比比在横向上的断裂伸长率百分比大至少100%。
3.根据前述权利要求中任一项所述的层压物,其中对于所述单轴定向第一多层膜,在横向上的断裂伸长率百分比与在纵向上的断裂伸长率百分比的比率为至少3比1,且对于所述双轴定向第二多层膜,在纵向上的断裂伸长率百分比与在横向上的断裂伸长率百分比的比率为至少3比1。
4.根据前述权利要求中任一项所述的层压物,其中所述单轴定向第一多层膜的厚度为15到30μm,且所述双轴定向第二多层膜的厚度为15到100μm。
5.根据前述权利要求中任一项所述的层压物,其中所述单轴定向第一多层膜包括:
至少一个外层,其具有包括至少0.950g/cc的密度和0.3到5g/10分钟的熔融指数(I2)的高密度聚乙烯;
至少一个内层,其包括具有小于0.900g/cc的密度和0.5到5g/10分钟的熔融指数的聚烯烃塑性体;和
安置于所述至少一个内层与所述至少一个外层之间的至少一个中间层,所述中间层包括密度大于0.930g/cc的基于乙烯的聚合物。
6.根据前述权利要求中任一项所述的层压物,其中所述双轴定向多层膜含有密封层。
7.根据前述权利要求中任一项所述的层压物,其中所述单轴定向第一多层膜包括至少10wt%的HDPE。
8.根据前述权利要求中任一项所述的层压物,其中所述双轴定向第二多层膜的所述基于乙烯的聚合物的密度为0.915到0.940g/cc且熔融指数为0.5到2.0g/10分钟。
9.根据前述权利要求中任一项所述的层压物,其中所述层压物包括粘着剂层,所述粘着剂层包括聚氨甲酸酯粘着剂。
10.根据前述权利要求中任一项所述的层压物,其中所述层压物在横向上的断裂伸长率百分比为在纵向上的断裂伸长率百分比的40%以内。
11.一种制品,其包括根据前述权利要求中任一项所述的层压结构,其中所述制品为软包装材料。
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