CN110352128A - 聚合物膜和由其产生的包装 - Google Patents
聚合物膜和由其产生的包装 Download PDFInfo
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- CN110352128A CN110352128A CN201780083811.4A CN201780083811A CN110352128A CN 110352128 A CN110352128 A CN 110352128A CN 201780083811 A CN201780083811 A CN 201780083811A CN 110352128 A CN110352128 A CN 110352128A
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Abstract
本发明涉及可热封多层膜,其包括支撑层,所述支撑层包括至少一个聚合物层;聚乙烯热封层和中间可剥离层。包含本发明的多层膜的热封包装具有可剥离的密封,其特征在于基本上与密封条件无关的适当剥离强度并且在剥离时基本上没有拉丝。
Description
技术领域
本发明涉及多层膜,其能够热密封到基板上以在膜和基板之间提供可剥离的密封。
背景技术
聚合物膜和各种表面之间的可剥离密封在包装领域中是公知的,例如用于食品和医疗设备的包装,并且例如在US 6,245,176 B1;EP 0 258 527 A1和EP 0 746 468 A1中公开。剥离这种密封的能力通常有利于密封包装的打开,此外,这种密封通常在它们被剥离后提供篡改(tampering)的证据。
可以剥离这种密封的机构和这样做所需的力通常取决于形成热密封所涉及的材料。然而,剥离将涉及分离密封区域中不同材料之间的边界或通过密封区域的聚合物层的内部破裂。
通常,剥离密封的能力取决于膜的热封层的组成和形成其与之热密封的表面的材料。因此,膜与其与之密封的表面之间的界面处的不相容性可以从高(结果导致不可接受的低密封强度)到低(结果导致热密封如此强使得它们在膜发生撕裂之前不会剥离)。
虽然可以通过适当选择用于热密封层的聚合物和其将与之热封的制品来在热封层/制品界面处剥离,但是当处理由其它材料制成的制品时这种方法变得不可能,例如纤维材料如未涂布纸,和其它纤维非织造材料,例如DuPont以商标“Tyvek”出售的材料。这是一个严重的缺陷,因为纸和被广泛用作医疗设备的包装材料。
在其结构内的层间(inter-ply)边界处因失效而剥离的可热封膜可用于形成具有各种材料的可剥离密封,例如纸和热塑性聚合物,因为热封的强度并不决定可剥离性。因为通过以下各项密封的剥离发生在可热封膜的厚度内:(1)在剥离开始时破裂通过密封层,然后(2)在热封区域分层,和(3)在剥离结束时破裂通过密封层,膜的一部分必然保持粘附在其已经热密封于其上的表面上,导致聚合物串(string,拉丝)从热封区的边缘悬挂。
作为在层边界处剥离的替代方案,还提出通过使用可热封膜形成可剥离的热密封,所述可热封膜包括至少一个具有相对低的内部粘合强度的外层。然后通过在其厚度内破裂该层来进行剥离,结果是当热封区域打开时,该层的一部分保留在剥离的膜上,并且部分也保留在膜已被热封至其上的表面上。这种膜的剥离通常取决于膜与之热封的表面的性质。拉丝和后续可能的污染可能是这种膜的一个问题,因为在具有低内部粘合强度而不是破裂到膜外部的层内的剥离倾向于在热封区域外部继续。
可用于生产在其厚度内通过破裂而剥离的密封的层的实例包括热塑性聚合物与不相容填料的共混物。这种填料可以是无机颗粒或不相容的聚合物。可以理解,为了使这些层在内部破裂而不是仅仅撕裂,它们需要具有比层本身的内部粘合强度更强的与相邻层的结合强度。
为了减少剥离时的拉丝,EP 0 971 819 A1公开了一种可热封的聚合物膜,其包括外部聚合物热封层,该热封层在其热封温度下具有粘度,使得它在这样的温度下流入并渗透纤维材料的纤维结构中,与热封层接触的中间聚合物层,中间聚合物层在剥离热封膜时能够粘合***,和至少一种另外的聚合物层,在发生剥离的温度下,热封层比中间层更容易破裂,剥离继续通过中间层。
由包含70至95wt%的聚乙烯或乙烯/丙烯共聚物和5至30wt%的包含聚二戊烯或多萜、α-甲基苯乙烯树脂、乙烯基甲苯/α-甲基苯乙烯树脂或改性芳族树脂的添加剂的共混物获得热封层在其热封温度下的适当粘度及其在剥离温度下破裂的趋势。
中间层(为了在剥离热封膜时在层内具有促进的***)包含35至85wt%的聚乙烯或乙烯/丙烯共聚物和15至65wt%的滑石的共混物,其中聚乙烯或乙烯/丙烯共聚物可以部分地由不相容的聚合物代替。
尽管观察到没有明显拉丝的正确剥离强度,但是在密封层中存在低分子量烃树脂(用于调节粘度和实现脆化)不仅在可热封膜的加工过程中而且在热封时产生令人不快的烟雾。
EP 0 746 468公开了一种多层聚合物膜,其包括聚丙烯聚合物的基层,基层上的无空隙中间层和中间层上的可热密封的聚合物层,该无空隙中间层的内部粘合强度小于中间层与基层或可热封层的结合强度,并小于基层或可热封层的内部粘合强度。
中间层包含丙烯聚合物和乙烯聚合物的共混物;可热密封的聚合物层可选自烯烃共聚物,更具体地为含有衍生自至少两种乙烯、丙烯和丁烷-1的单元的共聚物,优选为丙烯/乙烯共聚物和/或丙烯/乙烯/丁烷1三元共聚物。密封层的所有实例由含有4wt%的乙烯的丙烯/乙烯共聚物组成。
EP 2 216 368公开了一种用于密封剂的树脂组合物,其包含:
-乙烯聚合物,其密度(ASTM D 1505)为0.900-0.960g/m3,熔体流动速率(ASTMD1238,190℃;载荷为2.16)为0.1-70g/10min,量为10至70wt%;
-丙烯聚合物,其量为10-80wt%;
-丁烯聚合物,其量为10-70wt%。
包含上述树脂组合物的密封剂层允许高密封性和易剥离性。对于其中支撑层和密封层之间的粘合强度不足的可热封多层膜,可以使用中间粘合层。
EP 0 746 468和EP 2 216 368都没有解决在剥离时密封层的破裂趋势或者解决要满足的密封层聚合物特性以使所述密封层在其厚度内破裂。
在不对上述现有技术***的相关优点提出质疑的情况下,仍存在缺点并且需要改进。
发明内容
发明目的
本发明的目的是提供用于生产可热封包装的可热封多层膜,其具有可剥离的密封,其特征在于基本上与密封条件无关并且在剥离所述热封膜时基本上没有拉丝的适当的剥离强度,所述可热封多层膜在没有显著产生烟雾(fume)的情况下生产和密封,所述可热封多层膜的特征还在于密封层和可剥离中间层都具有最小厚度。
发明内容
本发明公开了一种可热封多层膜(A),包括:
a)包含至少一个聚合物层的支撑层;
b)聚乙烯热封层,所述聚乙烯的特征在于根据ASTM D1238在190℃下以2.16kg的载荷测量的熔体流动指数为2至110g/10min,优选为8至100g/10min,更优选为20至80g/10min,最优选为30至70g/10min;和
c)与支撑层(a)和热封层(b)接触的中间可剥离层,所述中间层(c)包含50至95wt%,优选为70至90wt%的聚乙烯和5至50wt%,优选为10至30wt%的一种或多种物质,所述物质选自由聚丙烯、聚丁烯、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯共聚物(PETG)、苯乙烯-丁二烯-苯乙烯共聚物(SBS)、环烯烃共聚物(COC)、聚甲基丙烯酸甲酯(PMMA)、苯乙烯甲基丙烯酸甲酯、丙烯腈丁二烯苯乙烯(ABS)和滑石组成的组,所述中间层(c)的内部粘合强度小于所述中间层(c)与支撑层(a)或可热封层(b)的结合强度,并且小于支撑层(a)或可热封层(b)的内部粘合强度;
其中:
-支撑层(a)占多层膜重量的70-94wt%,优选为80-90wt%;
-聚乙烯热封层(b)占多层膜重量的3-15wt%,优选为5-10wt%;
-中间层(c)占多层膜重量的3-15wt%,优选为5-10wt%;
(a)、(b)、(c)的总重量百分比为100。
本发明的优选实施方案公开了以下特征中的一个或多个:
-所述支撑层(a)的至少一种聚合物选自由聚酰胺、聚酯、聚碳酸酯、聚氯乙烯、聚丙烯、低密度聚乙烯、高密度聚乙烯、聚酯-二醇共聚物、乙烯-乙酸乙烯酯、乙烯丙烯酸酯离聚物、乙烯丙烯酸酯三元共聚物和苯乙烯-丁二烯共聚物组成的组。
-支撑层(a)是多层,包括:
-聚丙烯层和聚对苯二甲酸乙二醇酯层;或
-低密度聚乙烯和尼龙6的层;或
-乙烯-乙酸乙烯酯共聚物层、乙烯丙烯酸酯离聚物层和乙烯-乙酸乙烯酯共聚物层;或
-高密度聚乙烯层和低密度聚乙烯层;或
-聚对苯二甲酸乙二醇酯层和低密度聚乙烯层;
-聚乙烯热封层(b)是低密度聚乙烯热封层;
-聚乙烯热封层(b)基本上不含使层脆化的添加剂;
-中间层(c)的聚乙烯含有至少80wt%,优选为至少90wt%,更优选为至少95wt%,最优选为至少99%的聚合乙烯;
-中间层(c)的聚丙烯或聚丁烯包含的共聚乙烯含量不大于5wt%,优选不大于3wt%,更优选不大于2wt%,最优选不大于1wt%;
-中间可剥离层(c)的厚度为2至20μm,优选为4至15μm;
-热封层(b)的厚度为2至20μm,优选为4至15μm;
-用于热封层(b)的聚合物的特征在于,根据ASTM D638,在机器方向上的断裂伸长率小于500%,优选小于200%,更优选小于100%;
-用于热封层(b)的聚合物的特征在于,根据ASTM D638-14,在机器方向上的断裂拉伸强度小于13Mpa,优选小于10Mpa,更优选小于8MPa。
本发明进一步公开了一种热密封包装,其包括可热封多层膜(A)和与热封层(b)接触的基板(B),所述基板选自由另外的聚合物膜、涂布纸、非涂布纸、纸板、金属箔、纤维素非织造织物、聚合物非织造织物和织造织物组成的组,其中另外的聚合物膜选自由聚乙烯、聚酰胺、聚酯、聚碳酸酯、聚氯乙烯、乙烯乙酸乙烯酯和高抗冲聚苯乙烯组成的组,所述热密封包装的特征在于根据ASTM F88测量的剥离强度为2.0至6.0N/15mm,优选为2.5至5.0N/15mm,更优选为2.5至4N/15mm,破裂在中间可剥离层(c)内部。
本发明进一步公开了一种生产热封包装的方法,包括使基板(B)与可热封多层膜(A)的热封层(b)接触并在100和180℃,优选120至160℃的温度下密封,使用的停留时间为0.2至3秒,优选为0.5至2秒,且压力为100至600kPa,优选为150至400kPa,并冷却热封包装。
用于制造本发明的热封包装的方法的优选实施方案公开了在将多层膜(A)与基板(B)接触之前对热封层(b)进行等离子体处理,优选为电晕等离子体处理的附加步骤。
附图说明
图1显示了即将被热密封到基板上的根据本发明的膜的截面(section through)。
图2显示了被热密封到基板上的图1的膜的截面。
图3显示了其被剥离后的图2的热密封。
图例
A.可热封的多层膜
a.支撑层
b.聚乙烯热封层
c.中间可剥离层
B.基板
1.热密封条
2.热密封区域
3.密封层破裂
4.中间可剥离层粘合***
具体实施方式
根据本发明,提供了一种可热封的多层膜,其包括支撑层,所述支撑层包括至少一个聚合物层、聚乙烯热封层,所述聚乙烯的特征在于根据ASTM D1238在190℃下载荷2.16kg下测量的熔体流动指数为至少2g/10min,以及与支撑层和热封层接触的中间聚合物层,当剥离热封膜时,中间聚合物层能够粘合***(cohesively splitting),热封层在发生剥离的温度下比中间层更容易破裂使得剥离继续通过中间层的厚度时热封层破裂。
本发明的可热封多层膜的支撑层包含至少一个聚合物层,所述至少一个聚合物层包含选自由聚酰胺、聚酯、聚碳酸酯、聚氯乙烯、聚丙烯、低密度聚乙烯、中密度聚乙烯、高密度聚乙烯、聚酯-二醇共聚物、乙烯-乙酸乙烯酯、乙烯-丙烯酸酯离聚物、乙烯-丙烯酸酯三元共聚物和苯乙烯-丁二烯共聚物组成的组的聚合物。
优选地,支撑层是多层的,优选地包括聚丙烯层和聚对苯二甲酸乙二醇酯层;或低密度聚乙烯层和尼龙6;或乙烯-乙酸乙烯酯共聚物层、乙烯丙烯酸酯离聚物层和乙烯-乙酸乙烯酯共聚物层;或高密度聚乙烯层和低密度聚乙烯层;或聚对苯二甲酸乙二醇酯层和低密度聚乙烯层。
通常,支撑层的特征在于总厚度在10至600μm,优选为20至100μm。
关于热封层的聚乙烯,本发明是指由乙烯聚合制备的均聚物和由乙烯与一种或多种选自由丙烯酸酯、甲基丙烯酸酯、烷酸乙烯酯和α-烯烃组成的组的烯属不饱和单体的共聚制成的共聚物。
热封层的聚乙烯优选选自低密度聚乙烯、线性低密度聚乙烯、高密度聚乙烯、聚(乙烯-乙酸乙烯酯)、聚(乙烯-丙烯酸甲酯)和聚(乙烯-丙烯酸丁酯),其特征在于根据ASTMD1238在190℃下在载荷为2.16kg下测量的熔体流动指数为2至110g/10min,优选为8至100g/10min,更优选为20至80g/10min,最优选为30至70g/10min。
热封层的聚乙烯优选为低密度聚乙烯。
热封层包含大于70wt%,优选大于80wt%,更优选大于90wt%,最优选大于95%的聚乙烯,优选为低密度聚乙烯。
本发明的多层膜的热封层基本上不含使所述层脆化的添加剂。
产生脆化的添加剂的实例是聚二戊烯或多萜、α-甲基苯乙烯树脂、乙烯基甲苯/α-甲基苯乙烯树脂、改性芳族树脂或氢化烃树脂。
基本上不含在本发明中是指热封层包含小于5wt%,优选小于3wt%,更优选小于1wt%,最优选小于0.5wt%或甚至小于0.1wt%的使所述层脆化的添加剂。
优选地,热封层不包含使所述层脆化的添加剂。
热封层通常特征在于厚度为2至20μm,优选为4至15μm。
发明人已经发现,如在段落[0031]中所规定的,造成熔体流动指数的特定特性的聚乙烯热封层在适当的密封条件下密封时产生良好的密封并且在剥离温度下具有足够的脆化用于在剥离时使所述层在其厚度内破裂。
在约10μm的厚度下,聚乙烯热封层进一步特征在于,根据ASTM D638,在机器方向上的断裂伸长率小于500%,优选小于200%,更优选小于100%,且根据ASTM D638-14,在机器方向上的断裂拉伸强度小于13MPa,优选小于10MPa,更优选小于8MPa。
中间聚合物层包含聚乙烯和第二聚合物的共混物,第二聚合物与聚乙烯不相容,优选为与聚乙烯不相容的聚(α)烯烃,和/或滑石。
优选地,第二聚合物选自由聚丙烯、聚丁烯、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯共聚物(PETG)、苯乙烯丁二烯苯乙烯共聚物(SBS)、环烯烃共聚物(COC)、聚甲基丙烯酸甲酯(PMMA)、苯乙烯甲基丙烯酸甲酯、丙烯腈丁二烯苯乙烯(ABS)组成的组。优选地,第二聚合物是聚丙烯或聚丁烯、其中聚丙烯优选是丙烯和乙烯的均聚物或共聚物、所述共聚物具有不大于5wt%,优选不大于3wt%、更优选不大于2wt%、最优选不大于1wt%的共聚乙烯含量,并且其中聚丁烯优选是丁烯的均聚物或共聚物,优选为α丁烯和乙烯、所述共聚物的共聚乙烯含量不大于5wt%、优选不大于3wt%、更优选不大于2wt%、最优选不大于1wt%。
中间层的聚乙烯优选包含至少80wt%,更优选至少90wt%,最优选至少95wt%,或甚至至少99wt%的聚合乙烯,剩余重量百分比包含共聚C4至C8α-烯烃。
中间层包含50至95wt%,优选70至90wt%的聚乙烯和5至50wt%,优选10至30wt%的物质,所述物质选自由聚丙烯、聚丁烯、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯共聚物(PETG)、苯乙烯丁二烯苯乙烯共聚物(SBS)、环烯烃共聚物(COC)、聚甲基丙烯酸甲酯(PMMA)、苯乙烯甲基丙烯酸甲酯、丙烯腈丁二烯苯乙烯(ABS)和滑石组成的组。
中间层通常特征在于厚度为2至20μm,优选为4至15μm。
聚乙烯和聚丙烯和/或聚丁烯的共混物作为中间层允许热密封层的厚度减小,并具有所述密封层的均匀平坦表面。
可以通过已知方法制备根据本发明的多层膜。然而,通常优选通过共挤出最终膜的各层所需的聚合物和添加剂的熔体来制备它们,然后冷却以使膜形式的聚合物固化。通常,本发明的膜不会被取向,但如果需要,它们可以是单轴或双轴取向的(例如使用已知方法)。另一种方法是层压本发明的膜,例如由高密度聚乙烯外层、低密度聚乙烯中间层、中间可剥离层和外部可热封层组成的四层膜,到另一个膜,例如聚酰胺(尼龙)、聚碳酸酯、聚酯、聚氯乙烯或聚酯-二醇共聚物的另一个膜,或到箔。
根据本发明的膜还可以通过将热封层和中间可剥离层共挤出涂覆到合适的支撑层上或通过将热封层、中间可剥离层和聚乙烯层共挤出涂覆到合适的支撑层上来制备。
本发明的可热封多层膜可用于通过将所述多层膜热密封到基板上来生产可剥离的热封包装,所述基板可以是另外的聚合物、多层膜、金属箔、涂布纸或纤维基板如非涂布纸、纸板、纤维素非织造物、聚合物非织造物如DuPont以商标“Tyvek”销售的材料和织造织物。
将本发明的多层膜热封到基板上是在100-180℃,优选为120-160℃的温度下进行,使用的停留时间为0.2-3秒,优选为0.5-2秒且压力为100至600kPa,优选为150至400kPa。
对于其中将本发明的多层膜热封到另外的聚合物或多层膜的特定情况,优选的是所述另外的聚合物或多层膜包含外部聚乙烯热封层,所述外部聚乙烯热封层在热封时与本发明的多层膜的聚乙烯热封层接触。
本发明的多层膜的热封层的聚乙烯的熔体流动指数应使得在用于形成热封的温度下,例如110至180℃,保证热封层和基板之间的足够的机械互锁和化学锚固。
本发明的多层膜的聚乙烯热封层优选在接触和热封到基板之前进行等离子体处理,更优选在10-30kHz范围内的频率功率下进行电晕等离子体处理。
通过最短路径使密封层破裂后,通过扫描电子显微镜,根据本发明的多层膜已经显示出通过中间层的剥离(在中间层的厚度内的粘合***)的良好证据。
由本发明的多层膜和上述基板生产的可剥离包装已经显示出根据ASTM F88测量的小于10N/15mm的基本恒定的剥离强度,而不考虑热封温度,这是因为剥离强度主要取决于中间层的机械性能而不是热封的强度。
根据ASTM F88测量的剥离强度优选为1.0至8.0N/15mm,更优选为2.0至6.0N/15mm,最优选2.5至5N/15mm,且优选小于热封层与基板的结合强度。
对于热封到纤维基板上的多层膜的特定情况,特别优选的是,当膜被热密封到这种材料上时,进行多层膜剥离所需的每单位面积的力小于从纤维材料中除去纤维所需的每单位面积的力。
图1显示了根据本发明的膜(A)在热封到基板之前(B)使用热封条1,膜(A)由热封层(b)、中间可剥离层(c)和支撑层(a)组成。
然后将膜(A)热密封到基板(B)上以形成热封区2,如图2所示。可以看出,热封层(b)已部分地渗透到基板中,如热封区2所示,基板(B)现在接近与中间可剥离层(c)接触。在热封区2的外部,基板(B)与热封层(b)接触但不粘附在其上。
然后,将膜(A)剥离以产生如图3所示的剥离密封,脆性密封层通过最短路径3破裂至中间可剥离层,并且中间可剥离层在其厚度内具有粘合***4,将其中的一些留在热封区2中的基板(B)上,而其中一些保留在该区域中的膜(A)上。
热封层(b)的脆性特性使其在热封区2的两侧上干净地破裂,从而避免了拉丝(stringing)。
实施例
以下说明性实施例仅用于举例说明本发明,而不是用于限制或以其它方式限定本发明的范围。
实施例1
通过狭缝模头(slot die)通过共挤出合适膜的熔体铸造75μm厚的五层聚合物膜(铸造共挤出温度:260℃;铸造共挤线速度:20-30m/min.)。该膜具有第一层25μm厚,其由尼龙6聚酰胺组成,第二层由与马来酸酐接枝的线性低密度聚乙烯构成,第三层35μm厚的聚乙烯,通过5μm厚的系带(tie)粘附到聚酰胺层上,第四层5μm厚,由75wt%的低密度聚乙烯和25wt%的聚丁烯的共混物组成,且第五层由线性低密度聚乙烯组成,其特征在于根据ASTMD1238在190℃下载荷为2.16kg下测量的熔体流动指数为70g/10min。将膜冷却然后卷起。
此后,分别在120℃和130℃的温度下,使用1秒的停留时间和200kPa的压力,使用密封条将该膜的样品热密封到2FS(DuPont)片材上,施加到上作为顶部网。
使得到的热封冷却,然后通过从膜中拉出2FS片材将它们剥离。在每种情况下,通过第五层的破裂然后通过在五层膜的第四层内的粘合***发生剥离。紧接在热封区域之后,剥离通过第五层破裂,得到干净的剥离而没有拉丝。
如根据ASTM F88使用50mm长度样品的恒定90°剥离试验测量的(在Lloyd LRX机械试验机上以500mm/min进行),在120℃和130℃下形成的密封的剥离强度分别为3.0N/15mm和3.1N/15mm。
实施例2
实施例1的膜(仍具有如表1的第1列中的第四层共混物组合物(重量百分比)和如表1的第2列中的第五层聚乙烯熔体流动指数)使用密封条(在表1的第3列的温度下,使用1秒的停留时间和200kPa的压力施加到膜上作为顶部网)热封至2FS(DuPont)片材上。根据实施例1中的方法测量表1第4列中的剥离强度。
表1
在每种情况下,通过第五层的破裂然后通过在第四层内的粘合***发生剥离。紧接在热封区域之后,剥离通过第五层破裂,得到干净的剥离而没有拉丝。
实施例3
通过共挤出熔体铸造85μm厚的五层聚合物膜(铸造共挤出温度:260℃;铸造共挤线速度:20-30m/min.)。该膜具有第一层30μm厚,其由尼龙6组成,第二层由马来酸酐接枝的聚乙烯组成,第三层30μm厚的低密度聚乙烯,通过5μm厚的系带粘附到尼龙6层上;第四层10μm厚,由80wt%的低密度聚乙烯和20wt%的聚丙烯的共混物组成,且第五层10μm厚由线性低密度聚乙烯组成,其特征在于根据ASTM D1238在190℃下载荷为2.16kg下测量的熔体流动指数为80g/10min。将膜冷却然后卷起。
此后,将该膜的片材在其第五层侧进行电晕处理(25kHz),随后使用施加到纸上的密封条,在140℃的温度下使用1秒的停留时间和500kPa的压力将其热封到非涂布纸上。
使得到的热封冷却,然后通过从膜中拉出纸来剥离。通过第五层的破裂然后通过第四层内的粘合***进行剥离。紧接着热封区域,剥离通过第五层破裂,得到干净的剥离而没有拉丝。测量3.1N/15mm的剥离强度。
实施例4
通过共挤出熔体铸造60μm厚的四层聚合物膜(铸造共挤出温度:260℃;铸造共挤出线速度:20-30m/min.)。该膜具有第一层30μm厚,其由尼龙6聚酰胺组成,第二层由与马来酸酐接枝的线性低密度聚乙烯构成,第三层20μm厚的低密度聚乙烯,通过5μm厚的系带粘附到聚酰胺层上,第四层10μm厚的线性低密度聚乙烯,其特征在于根据ASTM D1238在190℃下载荷为2.16kg下测量的熔体流动指数为8g/10min。将膜冷却然后卷起。
实施例5
使实施例1的五层膜的片材与实施例4的四层膜的片材接触,其中将实施例1的膜的第五层(聚乙烯层MFI:70g/10min.)与实施例4的膜的第四层(聚乙烯层MFI:8g/10min.)接触。随后,在120℃的温度下使用1秒的停留时间和300kPa的压力使用施加到膜上的密封条来热密封样品。
使得到的热封冷却,然后通过从实施例4的膜中拉出实施例1的膜来剥离。通过实施例1的五层膜的第五层破裂,然后通过实施例1的五层膜的第四层内的粘合***进行剥离。紧接着热封区域,剥离通过实施例1的五层膜的第五层破裂,得到干净的剥离而没有拉丝。测量剥离强度为2.9N/15mm。
Claims (15)
1.一种可热封的多层膜(A),包括:
a)包含至少一个聚合物层的支撑层;
b)聚乙烯热封层,所述聚乙烯的特征在于根据ASTM D1238在190℃下使用2.16kg的载荷测量的熔体流动指数为2至110g/10min,优选8至100g/10min,更优选20至80g/10min,最优选30至70g/10min;和
c)与所述支撑层(a)和所述热封层(b)接触的可剥离中间层,所述中间层(c)包含50至95wt%,优选70至90wt%的聚乙烯和5至50wt%,优选10至30wt%的一种或多种物质,所述物质选自由聚丙烯、聚丁烯、聚苯乙烯(PS)、聚对苯二甲酸乙二醇酯共聚物(PETG)、苯乙烯丁二烯苯乙烯共聚物(SBS)、环烯烃共聚物(COC)、聚甲基丙烯酸甲酯(PMMA)、苯乙烯甲基丙烯酸甲酯、丙烯腈丁二烯苯乙烯(ABS)和滑石组成的组,所述中间层(c)的内部粘合强度小于所述中间层(c)与所述支撑层(a)或可热封层(b)的结合强度,并且小于所述支撑层(a)或所述可热封层(b)的内部粘合强度;
其中:
-所述支撑层(a)占所述多层膜重量的70-94wt%,优选80-90wt%;
-所述聚乙烯热封层(b)占所述多层膜重量的3-15wt%,优选5-10wt%;
-所述中间层(c)占所述多层膜重量的3-15wt%,优选5-10wt%;所述(a)、(b)、(c)的总重量百分比为100。
2.根据权利要求1所述的可热封的多层膜(A),其中所述支撑层(a)的至少一种聚合物选自由聚酰胺、聚酯、聚碳酸酯、聚氯乙烯、聚丙烯、低密度聚乙烯、高密度聚乙烯、聚酯-二醇共聚物、乙烯乙酸乙烯酯、乙烯丙烯酸酯离聚物、乙烯丙烯酸酯三元共聚物、和苯乙烯-丁二烯共聚物组成的组。
3.根据权利要求1或2所述的可热封的多层膜(A),其中所述支撑层(a)是多层,包括:
-聚丙烯层和聚对苯二甲酸乙二醇酯层;或
-低密度聚乙烯层和尼龙6层;或
-乙烯乙酸乙烯酯共聚物层、乙烯丙烯酸酯离聚物层和乙烯乙酸乙烯酯共聚物层;或
-高密度聚乙烯层和低密度聚乙烯层;或
-聚对苯二甲酸乙二醇酯层和低密度聚乙烯层。
4.根据前述权利要求中任一项所述的可热封的多层膜(A),其中所述聚乙烯热封层(b)是低密度聚乙烯热封层。
5.根据前述权利要求中任一项所述的可热封的多层膜(A),其中所述聚乙烯热封层(b)基本上不含使所述层脆化的添加剂。
6.根据前述权利要求中任一项所述的可热封的多层膜(A),其中:
-所述中间层(c)的聚乙烯包含至少80wt%,优选至少90wt%,更优选至少95wt%,最优选至少99%的聚合乙烯;且
-所述中间层(c)的聚丙烯或聚丁烯包含的共聚乙烯含量不大于5wt%,优选不大于3wt%,更优选不大于2wt%,最优选不大于1wt%。
7.根据前述权利要求中任一项所述的可热封的多层膜(A),其中所述可剥离中间层(c)的厚度为2至20μm,优选4至15μm。
8.根据前述权利要求中任一项所述的可热封的多层膜(A),其中所述热封层(b)的厚度为2至20μm,优选4至15μm。
9.根据前述权利要求中任一项所述的可热封的多层膜(A),其中用于所述热封层(b)的聚合物的特征在于根据ASTM D638,在机器方向上的断裂伸长率小于500%,优选小于200%,更优选小于100%。
10.根据前述权利要求中任一项所述的可热封的多层膜(A),其中用于所述热封层(b)的聚合物的特征在于根据ASTM D638-14,在机器方向上的断裂拉伸强度小于13MPa,优选小于10MPa,更优选小于8MPa。
11.一种热封包装,包含前述权利要求中任一项所述的可热封的多层膜(A)和与所述热封层(b)接触的基板(B),所述基板选自由另外的聚合物膜、涂布纸、非涂布纸、纸板、金属箔、纤维素非织造织物、聚合物非织造织物和织造织物组成的组。
12.根据权利要求11所述的热封包装,其中所述基板(B)是选自由聚乙烯、聚酰胺、聚酯、聚碳酸酯、聚氯乙烯、乙烯乙酸乙烯酯、和高抗冲聚苯乙烯组成的组的另外的聚合物膜。
13.根据权利要求11或12所述的热封包装,其中根据ASTM F88测量的剥离强度为2.0至6.0N/15mm,优选2.5至5.0N/15mm,更优选2.5至4N/15mm,破裂在所述可剥离中间层(c)内部。
14.一种制造权利要求11至13中任一项所述的热封包装的方法,包括使所述基板(B)与权利要求1至9所述的可热封的多层膜(A)的热封层(b)接触,并且在100-180℃,优选120-160℃的温度下,使用停留时间为0.2-3秒,优选0.5-2秒,和压力为100-600kPa,优选150-400kPa进行密封,并且冷却所述热封包装。
15.根据权利要求14所述的方法,包括在与所述基板接触之前,对所述热封层(b)进行等离子体处理,优选电晕-等离子体处理的附加步骤。
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- 2017-12-11 EP EP17821515.8A patent/EP3554825B1/en active Active
- 2017-12-11 BR BR112019012413-6A patent/BR112019012413B1/pt active IP Right Grant
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EP3554825A1 (en) | 2019-10-23 |
ES2836503T3 (es) | 2021-06-25 |
BR112019012413B1 (pt) | 2022-11-22 |
BR112019012413A2 (pt) | 2020-02-27 |
CN110352128B (zh) | 2021-10-29 |
EP3335872A1 (en) | 2018-06-20 |
CA3047256A1 (en) | 2018-06-21 |
EP3554825B1 (en) | 2020-10-21 |
JP2020501955A (ja) | 2020-01-23 |
WO2018108776A1 (en) | 2018-06-21 |
KR20190098148A (ko) | 2019-08-21 |
KR102463992B1 (ko) | 2022-11-08 |
MY193848A (en) | 2022-10-28 |
US11820110B2 (en) | 2023-11-21 |
JP7094978B2 (ja) | 2022-07-04 |
US20190366694A1 (en) | 2019-12-05 |
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