CN111868167B - 贴体包装用组合物、贴体包装用密封材料、及贴体包装用包装体 - Google Patents
贴体包装用组合物、贴体包装用密封材料、及贴体包装用包装体 Download PDFInfo
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- CN111868167B CN111868167B CN201980019064.7A CN201980019064A CN111868167B CN 111868167 B CN111868167 B CN 111868167B CN 201980019064 A CN201980019064 A CN 201980019064A CN 111868167 B CN111868167 B CN 111868167B
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- skin packaging
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- ionomer
- ethylene
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Abstract
本发明提供贴体包装用组合物,其包含熔体流动速率(JIS K7210‑1999,190℃,负荷为2160g)为6g/10min以上的乙烯·不饱和羧酸共聚物的离子交联聚合物(A)、和熔体流动速率(JIS K7210‑1999,190℃,负荷为2160g)为6g/10min以下的聚烯烃(B),相对于贴体包装用组合物中的树脂成分100质量%而言,聚烯烃(B)的含量为20质量%以上且50质量%以下。
Description
技术领域
本发明涉及贴体包装用组合物、贴体包装用密封材料、及贴体包装用包装体。
背景技术
所谓贴体包装,是指:将放置有内容物(即,被包装物)的底材托盘放入真空室中,使真空室内成为真空,将经加热的盖材膜加热,利用通过开放上侧室而产生的压差,将盖材膜与内容物密合及近似粘接,由此,将内容物真空包装。
以往,作为用于将火腿片、培根、水产加工品等贴体包装的膜,通常,使用了具有聚氯乙烯(PVC)/聚偏二氯乙烯(PVDC)/乙烯-乙酸乙烯酯共聚物(EVA)的层叠结构的膜。
然而,在收容包含尖锐骨等的水产加工品的情况下、在低温下进行保存的情况下,有时膜对于开孔(产生针孔)的抵抗力(以下,也称为“戳穿强度”。)差。另外,底材(例如托盘)为聚丙烯(PP)树脂的情况下,存在膜与托盘的粘接性差的问题。此外,从环境问题考虑,还要求包装材料的脱氯化。
作为柔软且与内容物的密合性优异的食品包装用多层膜,公开了至少包含尼龙层(A)、气体阻隔层(B)、粘接层(C)、离子交联聚合物层(D)及乙酸乙烯酯含有率为10%以上的乙烯-乙酸乙烯酯共聚物层(E)、且层结构为(A)-(B)-(C)-(D)-(E)、(A)-(C)-(B)-(C)-(D)-(E)、(B)-(A)-(C)-(D)-(E)、(B)-(C)-(A)-(C)-(D)-(E)、或(A)-(B)-(A)-(C)-(D)-(E)的软质多层膜(例如,参见日本专利第3085626号公报)。
另外,作为戳穿强度及内容物密合性优异的贴体包装盖材用共挤出多层膜,公开了下述贴体包装盖材用共挤出多层膜,其中,在外层配置离子交联聚合物树脂(IO)层,在中间层配置乙烯-乙酸乙烯酯共聚物皂化物(EVOH)层,在最内层配置乙酸乙烯酯含有率为8摩尔%以上且20摩尔%以下的乙烯-乙酸乙烯酯共聚物树脂(EVA)或热熔树脂(HM)层,离子交联聚合物树脂(IO)层相对于膜总厚度的厚度比为40%以上且70%以下,乙烯-乙酸乙烯酯共聚物皂化物(EVOH)层相对于膜总厚度的厚度比为10%以下(例如,参见日本专利第5034237号公报)。
发明内容
发明所要解决的课题
如日本专利第3085626号公报、日本专利第5034237号公报中公开的那样,以往,为了得到具有各种功能的贴体包装用膜,已进行了各种尝试。
本发明的课题在于提供能得到与以往的贴体包装用膜相比、在维持良好的易剥离性的同时、拉丝现象的发生被抑制的贴体包装用膜的贴体包装用组合物、以及使用了其的贴体包装用密封材料及贴体包装用包装体。
用于解决课题的手段
本发明包括以下的方式。
<1>
贴体包装用组合物,其包含:熔体流动速率(JIS K7210-1999,190℃,负荷为2160g)为6g/10min以上的乙烯·不饱和羧酸共聚物的离子交联聚合物(A)、和熔体流动速率(JIS K7210-1999,190℃,负荷为2160g)为6g/10min以下的聚烯烃(B),相对于上述贴体包装用组合物中的树脂成分100质量%而言,上述聚烯烃(B)的含量为20质量%以上且50质量%以下。
<2>
如<1>所述的贴体包装用组合物,其中,上述乙烯·不饱和羧酸共聚物的不饱和羧酸含量为10质量%以上且20质量%以下。
<3>
如<1>或<2>所述的贴体包装用组合物,其中,上述聚烯烃(B)包含选自由来自丙烯的结构单元及来自1-丁烯的结构单元组成的组中的至少1种。
<4>
如<1>~<3>中任一项所述的贴体包装用组合物,其中,上述离子交联聚合物(A)为选自由乙烯·不饱和羧酸共聚物的锌离子交联聚合物及乙烯·不饱和羧酸共聚物的钠离子交联聚合物组成的组中的至少1种。
<5>
如<1>~<4>中任一项所述的贴体包装用组合物,其中,相对于上述贴体包装用组合物中的树脂成分100质量%而言,上述离子交联聚合物(A)的含量为40质量%以上且80质量%以下。
<6>
如<1>~<5>中任一项所述的贴体包装用组合物,其还包含增粘树脂(C),相对于上述贴体包装用组合物中的树脂成分100质量%而言,上述增粘树脂(C)的含量为5质量%以上且25质量%以下。
<7>
贴体包装用密封材料,其包含<1>~<6>中任一项所述的贴体包装用组合物。
<8>
贴体包装用包装体,其具备第1膜和第2膜,通过使上述第1膜与上述第2膜相互密合,从而用于将内容物贴体包装,上述第1膜及上述第2膜中的至少一方具有<7>所述的贴体包装用密封材料。
<9>
如<8>所述的贴体包装用包装体,其中,上述贴体包装用密封材料被配置在上述第1膜及上述第2膜中的至少一方的与上述内容物接触的面的至少一部分。
<10>
如<8>或<9>所述的贴体包装用包装体,其中,上述第1膜具有至少1层包含离子交联聚合物(D)的层,上述第2膜具有上述贴体包装用密封材料。
<11>
如<10>所述的贴体包装用包装体,其中,上述离子交联聚合物(D)包含锌离子交联聚合物,包含上述离子交联聚合物(D)的层被配置在上述第1膜的与上述内容物接触的面的至少一部分。
发明的效果
通过本发明,可提供:能得到与以往的贴体包装用密封材料相比、在维持良好的易剥离性的同时、拉丝现象的发生被抑制的贴体包装用密封材料的贴体包装用组合物、以及使用了其的贴体包装用密封材料及贴体包装用包装体。
具体实施方式
以下,对作为本发明的一例的实施方式进行说明。本发明不受以下的实施方式的任何限制,可在本发明的目的的范围内进行适当变更而实施。
需要说明的是,本说明书中,数值范围中的“~”表示包含“~”的前后的数值。本说明书中分阶段地记载的数值范围中,某一数值范围中记载的上限值或下限值可替换为其他阶段的记载的数值范围的上限值或下限值。另外,本说明书中记载的数值范围中,某一数值范围中记载的上限值或下限值可替换为实施例中示出的值。
本说明书中,对于组合物中的各成分的量而言,在组合物中存在多种属于各成分的物质时,只要没有特别说明,是指在组合物中存在的该多种物质的总量。
本说明书中,所谓“(甲基)丙烯酸”,表示丙烯酸及甲基丙烯酸中的至少一方。
[贴体包装用组合物]
本说明书中的贴体包装用组合物包含熔体流动速率(JIS K7210-1999,190℃,负荷为2160g)为6g/10min以上的乙烯·不饱和羧酸共聚物的离子交联聚合物(A)、和熔体流动速率(JIS K7210-1999,190℃,负荷为2160g)为6g/10min以下的聚烯烃(B)。
认为通过使贴体包装用组合物具有上述的构成,从而能得到与以往的贴体包装用密封材料相比、在维持良好的易剥离性的同时、拉丝现象的发生被抑制的贴体包装用密封材料。
以下,对本说明书中的贴体包装用组合物中包含的各成分进行详细说明。
需要说明的是,只要没有特别记载,熔体流动速率(MFR)是按照JIS K7210-1999、在190℃、2160g负荷的条件下测定的值〔g/10分钟〕。
<乙烯·不饱和羧酸共聚物的离子交联聚合物(A)>
本说明书中,所谓乙烯·不饱和羧酸共聚物的离子交联聚合物(A),是指乙烯·不饱和羧酸系共聚物(即,基础聚合物)所具有的酸性基团的至少一部分被金属离子中和而得到的化合物。
形成离子交联聚合物的乙烯·不饱和羧酸系共聚物(即,基础聚合物)是至少使乙烯与不饱和羧酸共聚而得到的共聚物,具有来自乙烯的结构单元和来自不饱和羧酸的结构单元。
乙烯·不饱和羧酸系共聚物可以是嵌段共聚物、无规共聚物、接枝共聚物中的任一种。
从可在工业上获得的观点考虑,作为乙烯·不饱和羧酸系共聚物,优选为无规共聚物。
作为来自不饱和羧酸的结构单元,可举出例如来自丙烯酸、甲基丙烯酸、富马酸、马来酸等的结构单元。
这些中,作为来自不饱和羧酸的结构单元,优选为来自丙烯酸的结构单元或来自甲基丙烯酸的结构单元,最优选为来自甲基丙烯酸的结构单元。
关于本说明书中的乙烯·不饱和羧酸共聚物的离子交联聚合物(A)的不饱和羧酸含量,相对于乙烯·不饱和羧酸系共聚物的全部结构单元而言,从抑制拉丝现象的发生的观点考虑,优选为10质量%以上且20质量%以下,更优选为10质量%以上且18质量%以下,最优选为10质量%以上且17质量%以下。
需要说明的是,所谓乙烯·不饱和羧酸共聚物的不饱和羧酸含量,是指相对于乙烯·不饱和羧酸系共聚物的全部结构单元而言的来自不饱和羧酸的结构单元的含量。
关于来自乙烯的结构单元的含有率,相对于乙烯·不饱和羧酸系共聚物的全部结构单元而言,优选为80质量%以上且90质量%以下,更优选为82质量%以上且90质量%以下,最优选为83质量%以上且90质量%以下。
对于乙烯·不饱和羧酸系共聚物而言,除了来自乙烯的结构单元、和来自不饱和羧酸的结构单元之外,还可包含来自乙烯及不饱和羧酸以外的单体的结构单元(以下,也称为“其他结构单元”。)。
作为其他结构单元,可举出例如来自不饱和羧酸酯、乙烯以外的不饱和烃(例如,丙烯、丁烯、1,3-丁二烯、戊烯、1,3-戊二烯、1-己烯等)、乙烯基酯(例如,乙酸乙烯酯、丙酸乙烯酯等)、硫酸乙烯酯、硝酸乙烯酯等氧化物、卤素化合物(例如,氯乙烯、氟乙烯等)、含有乙烯基的伯胺及仲胺化合物、一氧化碳、二氧化硫等的结构单元。
这些中,作为其他结构单元,优选为来自不饱和羧酸酯的结构单元。
作为不饱和羧酸酯,没有特别限制,只要能与乙烯及不饱和羧酸共聚即可,可举出例如不饱和羧酸烷基酯。
作为不饱和羧酸烷基酯,可举出例如丙烯酸甲酯、丙烯酸乙酯、丙烯酸异丙酯、丙烯酸异丁酯、丙烯酸正丁酯、丙烯酸异辛酯等丙烯酸烷基酯、甲基丙烯酸甲酯、甲基丙烯酸乙酯、甲基丙烯酸异丁酯、甲基丙烯酸正丁酯、甲基丙烯酸异辛酯等甲基丙烯酸烷基酯、马来酸二甲酯、马来酸二乙酯等马来酸烷基酯等烷基酯中的烷基的碳原子数为1~12的不饱和羧酸烷基酯。
这些中,作为不饱和羧酸烷基酯,优选丙烯酸甲酯、丙烯酸乙酯、丙烯酸异丙酯、丙烯酸异丁酯、丙烯酸正丁酯、甲基丙烯酸甲酯、甲基丙烯酸乙酯、甲基丙烯酸异丁酯、甲基丙烯酸正丁酯、甲基丙烯酸异辛酯等丙烯酸或甲基丙烯酸的烷基酯,更优选丙烯酸或甲基丙烯酸的低级烷基酯(例如,烷基的碳原子数为2~5的烷基酯)。
乙烯·不饱和羧酸系共聚物包含来自不饱和羧酸酯的结构单元时,作为乙烯·不饱和羧酸系共聚物的优选的具体例,可举出乙烯·(甲基)丙烯酸·(甲基)丙烯酸烷基酯共聚物(例如,乙烯·(甲基)丙烯酸·丙烯酸甲酯共聚物、乙烯·(甲基)丙烯酸·丙烯酸乙酯共聚物、乙烯·(甲基)丙烯酸·丙烯酸丁酯共聚物等)。
关于其他结构单元的含量,从确保柔软性的观点考虑,相对于乙烯·不饱和羧酸系共聚物的全部结构单元而言,优选为0.1质量%~10质量%,更优选为1质量%~5质量%。
作为乙烯·不饱和羧酸系共聚物所具有的酸性基团的中和所使用的金属离子,没有特别限制。
作为金属离子,可举出例如锂、钠、钾、铷、铯等碱金属离子、镁、钙等碱土金属离子、锌等过渡金属离子、铝等各种金属离子等。
从容易获得工业化制品方面考虑,金属离子优选为选自由锌离子、镁离子及钠离子组成的组中的至少1种,更优选为选自由锌离子及钠离子组成的组中的至少一种,进一步优选为锌离子。
金属离子可以单独使用1种,或者也可并用2种以上。
乙烯·不饱和羧酸共聚物的离子交联聚合物(A)的中和度优选为90摩尔%以下,更优选为5摩尔%~80摩尔%,进一步优选为10摩尔%~70摩尔%。
中和度为90摩尔%以下时,能适度地抑制离子凝聚,并且,能进一步抑制流动性的下降,能更合适地维持成型加工性。
中和度为5摩尔%以上时,能更有效地发挥作为离子交联聚合物树脂的性能。
需要说明的是,本说明书中,所谓“中和度”,表示相对于乙烯·不饱和羧酸系共聚物(即,基础聚合物)所具有的酸性基团、尤其是羧基的摩尔数而言的、金属离子的配合比率(摩尔%)。
作为乙烯·不饱和羧酸共聚物的离子交联聚合物(A),可使用已上市的市售品。作为市售品,可举出例如Dupont-Mitsui Polychemicals Co.,Ltd.制HIMILAN(注册商标)系列等。
从抑制拉丝现象的发生的观点考虑,乙烯·不饱和羧酸共聚物的离子交联聚合物(A)的熔体流动速率(MFR)为6g/10min以上,优选为8g/10min以上,更优选为10g/10min以上,进一步优选为12g/10min以上。
熔体流动速率(MFR)的上限没有特别限制,从加工性的观点考虑,优选为400g/10min以下,更优选为30g/10min以下,进一步优选为25g/10min以下,最优选为20g/10min以下。
<聚烯烃(B)>
本说明书中的贴体包装用组合物含有熔体流动速率(JIS K7210-1999,190℃,负荷为2160g)为6g/10min以下的聚烯烃(B)。
本发明中的聚烯烃(B)的熔体流动速率(MFR)为6g/10min以下。聚烯烃(B)的熔体流动速率(MFR)优选为5g/10min以下,更优选为4g/10min以下。
通过使聚烯烃(B)的熔体流动速率(MFR)为6g/10min以下,从而能得到良好的易剥离性。熔体流动速率(MFR)的下限没有特别限制,从加工性的观点考虑,优选为1g/10min以上,更优选为2g/10min以上。
对于聚烯烃(B)而言,从剥离性的观点考虑,优选包含选自由来自丙烯的结构单元及来自1-丁烯的结构单元组成的组中的至少1种,进一步优选包含来自丙烯的结构单元。聚烯烃(B)优选包含选自由来自丙烯的结构单元及来自1-丁烯的结构单元组成的组中的至少1种作为主成分。作为聚烯烃(B),可举出丙烯的均聚物、以丙烯为主成分的丙烯与其他α-烯烃(例如乙烯、1-丁烯、1-戊烯、4-甲基-1-戊烯等)的共聚物、1-丁烯均聚物、1-丁烯与其他α-烯烃的共聚物等。
此处,所谓“主成分”,是指其结构单元的含量相对于聚烯烃(B)的全部结构单元而言为50质量%以上。所谓“聚烯烃(B)包含选自由来自丙烯的结构单元及来自1-丁烯的结构单元组成的组中的至少1种作为主成分”,是指:聚烯烃(B)包含来自丙烯的结构单元及来自1-丁烯的结构单元的情况下,来自丙烯的结构单元及来自1-丁烯的结构单元的总含量为50质量%以上。
更具体而言,作为聚烯烃(B),可例举聚丙烯、丙烯·乙烯无规共聚物、丙烯·乙烯·1-丁烯无规共聚物、聚1-丁烯、1-丁烯·丙烯无规共聚物等作为代表例。
对于本说明书中的贴体包装用组合物而言,从维持良好的易剥离性、抑制拉丝现象的发生的观点考虑,将贴体包装用组合物中的树脂成分作为100质量%,乙烯·不饱和羧酸共聚物的离子交联聚合物(A)的含量优选为40质量%以上且80质量%以下,更优选为50质量%以上且75质量%以下,进一步优选为50质量%以上且70质量%以下。
另外,从同样的观点考虑,将贴体包装用组合物中的树脂成分作为100质量%,聚烯烃(B)的含量为20质量%以上且50质量%以下,优选为20质量%以上且45质量%以下,更优选为25质量%以上且45质量%以下。
本说明书中,所谓“树脂成分”,是指贴体包装用组合物中包含的离子交联聚合物(A)、聚烯烃(B)及增粘树脂(C)。
<增粘树脂(C)>
另外,本说明书中的贴体包装用组合物可以还包含增粘树脂(C)。
作为增粘树脂(C)的例子,可举出脂肪族系烃树脂、脂环族系烃树脂、芳香族系烃树脂、苯乙烯系树脂、萜烯树脂、松香类等。
作为脂肪族系烃树脂的例子,可举出以1-丁烯、异丁烯、丁二烯、1,3-戊二烯、异戊二烯、间戊二烯等C4~C5单或二烯烃为主成分的聚合物等。
作为脂环族系烃树脂的例子,可举出使废(spent)C4~C5馏分中的二烯成分进行环化二聚物化后、使其聚合而得到的树脂、使环戊二烯等环状单体聚合而得到的树脂、对芳香族系烃树脂进行核氢化而得到的树脂等。作为芳香族系烃树脂的例子,可举出以乙烯基甲苯、茚、α-甲基苯乙烯等C9~C10的乙烯基芳香族烃为主成分的树脂等。
此处,所谓“主成分”,是指该结构单元的含量相对于烃树脂的全部结构单元而言为50质量%以上。
作为苯乙烯系烃树脂的例子,可举出苯乙烯、乙烯基甲苯、α-甲基苯乙烯、异丙烯基甲苯等聚合物等。
作为萜烯系树脂的例子,可举出α-蒎烯聚合物、β-蒎烯聚合物、二戊烯聚合物、萜烯-苯酚共聚物、α-蒎烯-苯酚共聚物、氢化萜烯树脂等。
作为松香类的例子,可举出松香、聚合松香、氢化松香、松香酯、松香苯酚树脂及其酯等。
这些中,特别优选使用氢化芳香族烃树脂、氢化萜烯树脂等氢化型树脂。
对于增粘树脂(C)的含量而言,从维持良好的易剥离性的观点考虑,将贴体包装用组合物的树脂成分作为100质量%,优选为0质量%以上且25质量%以下,更优选为1质量%以上且25质量%以下,进一步优选为5质量%以上且25质量%以下,特别优选为5质量%以上且20质量%以下,最优选为5质量%以上且18质量%以下。
本说明书中的贴体包装用组合物中,除了上述的成分之外,可以配合任意的添加剂。作为这样的添加剂,可举出例如抗氧化剂、热稳定剂、光稳定剂、防静电剂、润滑剂、着色剂等。尤其是,为了提高组合物的加工性,优选配合润滑剂。作为这样的润滑剂,可例举脂肪酸酰胺、高分子量聚乙二醇、氢化蓖麻油、二氧化硅等。
关于这样的润滑剂,相对于上述贴体包装用组合物的总量100质量份而言,在有机化合物润滑剂的情况下,配合100ppm~10000ppm左右是有效的,另外,在二氧化硅这样的无机化合物润滑剂的情况下,配合0.1质量%~3质量%左右是有效的。
在使用润滑剂的情况下,将本说明书中的贴体包装用组合物挤出涂覆加工至基材时,具有不仅防止膜彼此的粘连、向金属辊的粘着,而且还提高回卷等后续工序的操作性这样的优点。
对于本说明书中的贴体包装用组合物而言,考虑到成型性及密封特性,熔体流动速率优选为1g/10min~400g/10min,更优选为1g/10min~150g/10min。
<贴体包装用密封材料>
本公开文本涉及的贴体包装用密封材料包含上述的贴体包装用组合物。
密封材料中,贴体包装用组合物可以以单层使用,也可在基材上层叠密封材料作为热封层而使用。作为这样的基材,可以为拉伸或未拉伸的膜,例如可例举聚对苯二甲酸乙二醇酯这样的聚酯、聚酰胺、聚丙烯、聚乙烯、乙烯·乙酸乙烯酯共聚物、乙烯·不饱和羧酸酯共聚物、乙烯·不饱和羧酸共聚物或其离子交联聚合物、乙烯·乙烯醇共聚物等的膜、纸、铝箔、蒸镀有铝、二氧化硅、氧化铝、氧化镁等的膜、涂覆有聚偏二氯乙烯、聚乙烯醇等气体阻隔材料的膜等。这些基材可以为单层,也可以为2层以上的层叠品。
作为将本说明书中的贴体包装用组合物层叠在基材上的方法,有将贴体包装用组合物直接挤出在基材上并进行层压的方法、将通过吹胀、T-模铸塑成型而制成了膜状的贴体包装用组合物与基材层压的、所谓的热层压法、干式层压法、夹层层压法、共挤出吹胀法、共挤出T模法等一般的方法,任意方法均可适用。
本说明书中的贴体包装用密封材料的厚度优选为1μm~200μm,更优选为2μm~100μm,最优选为5μm~50μm。
另外,在将贴体包装用密封材料作为剥离膜使用的情况下,从剥离时的操作性的观点考虑,基材的厚度优选为30μm~500μm左右。将贴体包装用密封材料作为底材使用的情况下,对于基材的厚度没有特别限制。
<贴体包装用包装体>
本公开文本涉及的贴体包装用包装体具备第1膜和第2膜,通过使上述第1膜与上述第2膜相互密合,从而用于将内容物贴体包装,上述第1膜和上述第2膜中的至少一方具有上述的贴体包装用密封材料。
另外,贴体包装用密封材料优选被配置在第1膜及第2膜的与内容物接触的面的至少一部分。根据其他实施方式,贴体包装用密封材料优选被配置在第1膜及第2膜中的至少一方的与内容物接触的面的至少一部分。
根据其他实施方式,贴体包装用密封材料优选被配置在第1膜及第2膜中的至少一方的、第1膜与第2膜相对的这侧的面的至少一部分。
此处,所谓内容物,包含各种饮食品、医药品等各种物质,没有特别限制,只要是能进行贴体包装的物质即可。
本说明书中的贴体包装用包装体至少具备第1膜和第2膜。
而且,可以是在第1膜和第2膜这两方上具备包含本说明书中的贴体包装用组合物的贴体包装用密封材料的方式,也可以是仅在第1膜上具备上述贴体包装用密封材料的方式,也可以是仅在第2膜上具备上述贴体包装用密封材料的方式。
此处,第1膜及第2膜可以为单层,也可以为2层以上的层叠体。另外,第1膜及第2膜分别可以为相同的层结构,另外,也可以为不同的层结构,没有特别限制。
根据一个实施方式,从深拉性的观点考虑,优选第1膜及第2膜中的至少一方包含离子交联聚合物(D)。可以是第1膜具有至少1层包含离子交联聚合物(D)的层,第2膜具有贴体包装用密封材料的方式;也可以是第1膜具有贴体包装用密封材料,第2膜具有至少1层包含离子交联聚合物(D)的层的方式。
另外,可以是第1膜具有至少1层包含离子交联聚合物(D)的层和贴体包装用密封材料的方式,也可以是第2膜具有至少1层包含离子交联聚合物(D)的层和贴体包装用密封材料的方式。
需要说明的是,第1膜和第2膜的具体的层结构、第1膜与第2膜的组合可根据贴体包装用包装体的用途、目的适当组合。
此处,包含离子交联聚合物(D)的层中的所谓离子交联聚合物(D),没有特别限制,只要是利用了金属离子的凝聚力的合成树脂即可。
作为金属离子,可举出例如锂、钠、钾、铷、铯等碱金属离子、镁、钙等碱土金属离子、锌等过渡金属离子、铝等各种金属离子等,更优选为选自由锌离子及钠离子组成的组中的至少一种,进一步优选为锌离子。
另外,形成离子交联聚合物(D)的基础聚合物没有特别限制,优选为乙烯·不饱和羧酸系共聚物,可例举上述的离子交联聚合物(A)。
在第1膜及第2膜中的至少一方中具有包含离子交联聚合物(D)的层的情况下,离子交联聚合物(D)优选为锌离子交联聚合物。此时,包含锌离子交联聚合物的层优选被配置在与内容物接触的面的至少一部分。
此处,所谓锌离子交联聚合物,作为基础聚合物,优选使用乙烯·不饱和羧酸系共聚物。
以第1膜被应用于盖材侧、第2膜被应用于托盘(底材)侧的情况为例,来说明本说明书中的贴体包装用包装体,但不限于以下的方式。
关于盖材及托盘的层结构,可使用现有已知的层结构。
此处,在用包含离子交联聚合物(D)的层(IO)、EVOH层(B)、乙烯-乙酸乙烯酯共聚物树脂层(EVA)、热熔树脂层(HM)、包含聚乙烯的层(PE)、包含聚丙烯的层(PP)、包含尼龙的层(Ny)、二醇改性聚对苯二甲酸乙二醇酯树脂层(PET-G)、发泡基材、本说明书中的贴体包装用密封材料(EZP)表示的情况下,例如可形成以下的层结构。
上述离子交联聚合物(D)可与本说明书中的贴体包装用密封材料(EZP)中包含的离子交联聚合物(A)相同,也可与其不同。
需要说明的是,虽然省略了粘接剂层的标示,但根据需要可在各层间适当使用。
<盖材>
(1-1)IO/B/EVA(内容物侧)
(1-2)PE/IO/B/EVA/IO(内容物侧)
(1-3)IO/B/HM(内容物侧)
(1-4)IO/B/IO/EVA(内容物侧)
(1-5)IO/EVA/IO/EZP(内容物侧)
(1-6)Ny/IO/B/EVA/IO(内容物侧)
(1-7)PE/IO/Ny/B/EVA/IO(内容物侧)
(1-8)Ny/IO/Ny/B/Ny/EVA/IO(内容物侧)
(1-9)PET-G/B/IO/EZP(内容物侧)
<托盘(底材)>
(2-1)发泡基材/PP/B/EZP(内容物侧)
(2-2)PP/B/PP/IO(内容物侧)
(2-3)PP/B/PP/EZP(内容物侧)
例如,盖材为上述(1-1)的情况下,盖材的层叠结构表示以包含离子交联聚合物(D)的层(IO)、EVOH层(B)、乙烯-乙酸乙烯酯共聚物树脂层(EVA)的顺序层叠,表示在这些层中,乙烯-乙酸乙烯酯共聚物树脂层(EVA)位于最接近内容物的这侧。此时,乙烯-乙酸乙烯酯共聚物树脂层(EVA)可与内容物直接接触,也可在上述乙烯-乙酸乙烯酯共聚物树脂层(EVA)与上述内容物之间存在其他层。
上述的盖材及托盘(底材)中,优选的组合为[(1-1)或(1-2)或(1-6)或(1-7)]与[(2-1)或(2-3)]、(1-5)与[((2-1)或(2-2)],更优选的组合为[(1-1)或(1-2)]与[(2-1)或(2-3)],进一步优选的组合为(1-2)与(2-1)。
对于上述(1-2)与(2-1)的组合而言,换言之,可以说是下述实施方式:盖材具有至少1层至少包含离子交联聚合物(D)的层,另一方面,托盘(底材)具有本公开文本涉及的贴体包装用密封材料(EZP)。
该实施方式可合适地用于将食品、药剂等贴体包装的用途。
上述实施方式中,盖材与食品(内容物)接触的面的至少一部分为包含锌离子交联聚合物的层,并且,托盘(底材)与食品(内容物)接触的面的至少一部分为包含锌离子交联聚合物的本公开文本涉及的贴体包装用密封材料时,具有延长食品(内容物)的保质期的效果,因此可以说是最优选的实施方式。
实施例
以下,利用实施例进一步具体地说明本发明,但本发明不受以下的实施例的限制,只要不超出其主旨即可。
另外,熔体流动速率(MFR)按照JISK7210-1999进行测定。
[实施例1~8、比较例1~6]
-树脂组合物的制备-
以表1所示的配合比例,以装料量成为10kg的方式,将以下的树脂混合。将该混合物投入至挤出机(φ65mm,L/D=28,前端杜尔麦基式螺纹螺杆(head Dulmage flightscrew))中,以160℃的加工温度进行熔融混炼,由此,制作树脂组合物,得到本发明中的树脂组合物(实施例)和比较用的树脂组合物(比较例)。
<乙烯·不饱和羧酸共聚物的离子交联聚合物(A)>
·离子交联聚合物1:乙烯·甲基丙烯酸共聚物的Zn中和物(乙烯单元含量为85质量%,甲基丙烯酸单元含量为15质量%,Zn中和度为21%,MFR(190℃,2160g负荷)为16g/10分钟)
·离子交联聚合物2:乙烯·甲基丙烯酸共聚物的Zn中和物(乙烯单元含量为89质量%,甲基丙烯酸单元含量为11质量%,Na中和度为37%,MFR(190℃,2160g负荷)为11g/10分钟)
·离子交联聚合物3:乙烯·甲基丙烯酸共聚物的Zn中和物(乙烯单元含量为85质量%,甲基丙烯酸单元含量为15质量%,Zn中和度为23%,MFR(190℃,2160g负荷)为5g/10分钟)
·离子交联聚合物4:乙烯·甲基丙烯酸共聚物的Zn中和物(乙烯单元含量为88质量%,甲基丙烯酸单元含量为12质量%,Zn中和度为36%,MFR(190℃,2160g负荷)为1.5g/10分钟)
·离子交联聚合物5:乙烯·甲基丙烯酸共聚物的Na中和物(乙烯单元含量为85质量%,甲基丙烯酸单元含量为15质量%,Na中和度为30%,MFR(190℃,2160g负荷)为2.8g/10分钟)
<聚烯烃(B)>
·PP-1:聚丙烯(无规型,MFR(190℃,2160g负荷)为3.1g/10分钟,MFR(230℃,2160g负荷)为6g/10分钟,Prime Polymer Co.,Ltd.制F317DV)
·PP-2:聚丙烯(均聚型,MFR(190℃,2160g负荷)为3.2g/10分钟,MFR(230℃,2160g负荷)为7g/10分钟,Prime Polymer Co.,Ltd.制F107BV)
·PP-3:聚丙烯(无规型,MFR(190℃,2160g负荷)为6.5g/10分钟,MFR(230℃,2160g负荷)为25g/10分钟,Prime Polymer Co.,Ltd.制F329RA)
·PB-1:聚1-丁烯(均聚型,MFR(190℃,2160g负荷)为3.7g/10分钟,三井化学公司制BL4000)
<增粘树脂(C)>
·增粘树脂:荒川化学工业(株)公司制“ARKON AM-1”(环球法软化点为115℃的脂环族烃树脂)
接下来,按照以下所示的方式,使用上文中得到的树脂组合物,制作层叠体并进行评价。
但是,对于比较例2、3所示的树脂组合物而言,造粒性差,未能制作层叠体。
需要说明的是,表1中的“-”标记表示不包含该成分。
-层叠体的制作-
使用得到的树脂组合物制作层叠体。详细而言,使用φ40mm 3种3层的铸塑成型机,使加工温度为200℃,作为共挤出的树脂,选择乙烯·甲基丙烯酸共聚物(酸含量为9质量%,MFR为8g/10分钟),于230℃,利用加工速度为25m/分钟的挤出层压法,在预先制成的PET(12μm)/PE(15μm)的基材上层叠厚度为40μm的乙烯·甲基丙烯酸共聚物、厚度为20μm的上文中得到的树脂组合物,制作PET(12μm)/PE(15μm)/乙烯·甲基丙烯酸共聚物(40μm)/树脂组合物(密封材料层)(20μm)的层叠体。
-相对于Zn离子交联聚合物的剥离强度-
以层叠体的密封材料层侧与Zn离子交联聚合物膜相对的方式,在按压力为0.2MPa、加热温度为160℃、加热时间为1.0秒的条件下将得到的层叠体热封在厚度为0.1mm的Zn离子交联聚合物的膜(基材)上,室温放置24小时。然后,将沿MD方向及TD方向从层叠体切出的15mm宽的试验片的两面沿相反方向(按照180℃的剥离方向)拉拽,求出最大应力。将该最大应力(N/15mm)作为树脂组合物的相对于Zn离子交联聚合物的MD方向及TD方向的剥离强度(N/15mm)。将测定结果示于表1。
此处,大于1.0N/15mm且为10N/15mm以下为优选的剥离强度。
需要说明的是,使用乙烯·甲基丙烯酸共聚物的Zn中和物(乙烯单元含量为85质量%,甲基丙烯酸单元含量为15质量%,Zn中和度为59%,MFR(190℃,2160g负荷)为0.9g/10分钟),用φ40mm单层铸塑成型机,于230℃,制作Zn离子交联聚合物膜。
-拉丝性-
上述的剥离强度的评价中,目视观察剥离部。有时在剥离部分形成细丝状的树脂。这被通称为拉丝现象。不仅从外观考虑,而且从将作为食品的内容物取出时万一丝碎片接触到食品等异物混入的观点考虑,该现象都是令人讨厌的特性。通过目视来记录有无拉丝现象。将测定结果示于表1。
-相对于Na离子交联聚合物的剥离强度及拉丝性-
以层叠体的密封材料层侧与Na离子交联聚合物膜相对的方式,在按压力为0.2MPa、加热温度为140℃、加热时间为1.0秒的条件下,将实施例1中得到的层叠体热封在厚度为0.1mm的Na离子交联聚合物的膜(基材)上,室温放置24小时。然后,将从层叠体切出的15mm宽的试验片的两面沿相反方向(按照180℃的剥离方向)拉拽,求出最大应力。将该最大应力(N/15mm)作为树脂组合物的相对于Na离子交联聚合物的剥离强度(N/15mm)。除了变更热封温度之外,按照与上述条件相同的条件进行测定,也求出热封温度为160℃时的树脂组合物的相对于Na离子交联聚合物的剥离强度。另外,与上述同样地,观察有无拉丝现象。
将结果示于表2。
此处,大于1.0N/15mm且为10N/15mm以下是优选的剥离强度。
需要说明的是,使用乙烯·甲基丙烯酸共聚物的Na中和物(乙烯单元含量为85质量%,甲基丙烯酸单元含量为15质量%,Na中和度为54%,MFR(190℃,2160g负荷)为0.9g/10分钟),用φ40mm单层铸塑成型机,于230℃,制作Na离子交联聚合物膜。
-相对于EVA的剥离强度及拉丝性-
以层叠体的密封材料层侧与EVA膜相对的方式,在按压力为0.2MPa、加热温度为140℃、加热时间为1.0秒的条件下将实施例1中得到的层叠体热封在厚度为0.1mm的EVA(乙烯·乙酸乙烯酯共聚物)的膜(基材)上,室温放置24小时。然后,将从层叠体切出的15mm宽的试验片的两面沿相反方向(按照180℃的剥离方向)拉拽,求出最大应力。将该最大应力(N/15mm)作为树脂组合物的相对于EVA的剥离强度(N/15mm)。除了变更热封温度之外,按照与上述条件相同的条件进行测定,也求出热封温度为160℃时的树脂组合物的相对于EVA的剥离强度。另外,与上述同样地,观察有无拉丝现象。
将结果示于表2。
此处,大于1.0N/15mm且为10N/15mm以下是优选的剥离强度。
需要说明的是,使用乙烯·乙酸乙烯酯共聚物(乙烯单元含量为90质量%,乙酸乙烯酯单元含量为10质量%,MFR(190℃,2160g负荷)为9g/10分钟),用φ40mm单层铸塑成型机,于200℃,制作EVA膜。
-相对于LDPE的剥离强度及拉丝性-
以层叠体的密封材料层侧与LDPE膜相对的方式,在按压力为0.2MPa、加热温度为140℃、加热时间为1.0秒的条件下将实施例1中得到的层叠体热封在厚度为0.1mm的LDPE(低密度聚乙烯)的膜(基材)上,室温放置24小时。然后,将从层叠体切出的15mm宽的试验片的两面沿相反方向(按照180℃的剥离方向)拉拽,求出最大应力。将该最大应力(N/15mm)作为树脂组合物的相对于LDPE的剥离强度(N/15mm)。除了变更热封温度之外,按照与上述条件相同的条件进行测定,也求出热封温度为160℃时的树脂组合物的相对于LDPE的剥离强度。另外,与上述同样地,观察有无拉丝现象。
将结果示于表2。
此处,大于1.0N/15mm且为10N/15mm以下是优选的剥离强度。
需要说明的是,使用高压法低密度聚乙烯(917kg/m3,MFR(190℃,2160g负荷)为7g/10分钟),用φ40mm单层铸塑成型机,于200℃,制作LDPE膜。
[表1]
相对于Zn离子交联聚合物的剥离强度
[表2]
由表1可知,对于由本实施例的贴体包装用组合物得到的贴体包装用密封材料而言,在维持良好的易剥离性的同时,拉丝现象的发生被抑制。另一方面,对于由比较例的贴体包装用组合物得到的贴体包装用密封材料而言,剥离性不良,或者虽然剥离性良好,但发生了拉丝现象,因此,均比实施例差。
另外,由表2可知,对于由实施例1的贴体包装用组合物得到的贴体包装用密封材料而言,相对于以Zn离子交联聚合物的膜为代表的各种基材,在维持良好的易剥离性的同时,未观察到拉丝现象的发生。
需要说明的是,通过参照,将于2018年3月20日提出申请的日本专利申请第2018-053520号公开的全部内容并入本说明书中。
本说明书中记载的所有文献、专利申请、及技术标准通过参照被并入本说明书中,各文献、专利申请、及技术标准通过参照被并入的程度与具体且分别地记载的情况的程度相同。
Claims (10)
1.贴体包装用组合物,其包含:
在JIS K7210-1999、190℃、负荷为2160g测定的熔体流动速率为10g/10min以上的乙烯·不饱和羧酸共聚物的离子交联聚合物(A),
在JIS K7210-1999、190℃、负荷为2160g测定的熔体流动速率为6g/10min以下的聚烯烃(B),和
增粘树脂(C),
所述聚烯烃(B)为均聚聚丙烯或均聚聚1-丁烯,
相对于所述贴体包装用组合物中的树脂成分100质量%而言,所述聚烯烃(B)的含量为25质量%以上且50质量%以下,
相对于所述贴体包装用组合物中的树脂成分100质量%而言,所述增粘树脂(C)的含量为1质量%以上且25质量%以下。
2.如权利要求1所述的贴体包装用组合物,其中,所述乙烯·不饱和羧酸共聚物的不饱和羧酸含量为10质量%以上且20质量%以下。
3.如权利要求1所述的贴体包装用组合物,其中,所述离子交联聚合物(A)为选自由乙烯·不饱和羧酸共聚物的锌离子交联聚合物及乙烯·不饱和羧酸共聚物的钠离子交联聚合物组成的组中的至少1种。
4.如权利要求1所述的贴体包装用组合物,其中,相对于所述贴体包装用组合物中的树脂成分100质量%而言,所述离子交联聚合物(A)的含量为40质量%以上且70质量%以下。
5.如权利要求1所述的贴体包装用组合物,其中,
相对于所述贴体包装用组合物中的树脂成分100质量%而言,所述增粘树脂(C)的含量为5质量%以上且25质量%以下。
6.贴体包装用密封材料,其包含权利要求1~5中任一项所述的贴体包装用组合物。
7.贴体包装用包装体,其具备第1膜和第2膜,通过使所述第1膜与所述第2膜相互密合,从而用于将内容物贴体包装,
所述第1膜及所述第2膜中的至少一方具有权利要求6所述的贴体包装用密封材料。
8.如权利要求7所述的贴体包装用包装体,其中,所述贴体包装用密封材料被配置在所述第1膜及所述第2膜中的至少一方的与所述内容物接触的面的至少一部分。
9.如权利要求7所述的贴体包装用包装体,其中,所述第1膜具有至少1层包含离子交联聚合物(D)的层,
所述第2膜具有所述贴体包装用密封材料。
10.如权利要求9所述的贴体包装用包装体,其中,所述离子交联聚合物(D)包含锌离子交联聚合物,包含所述离子交联聚合物(D)的层被配置在所述第1膜的与所述内容物接触的面的至少一部分。
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