CN104662113A - 设有凹槽的胶带 - Google Patents
设有凹槽的胶带 Download PDFInfo
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- CN104662113A CN104662113A CN201380045414.XA CN201380045414A CN104662113A CN 104662113 A CN104662113 A CN 104662113A CN 201380045414 A CN201380045414 A CN 201380045414A CN 104662113 A CN104662113 A CN 104662113A
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- binder layer
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Abstract
本发明的目标是改善由胶带和基底之间夹杂的气泡对胶带与基底的粘着性的损害。依照本发明,该目标是借助于包括至少一个粘合剂层的胶带实现的,其中该粘合剂层具有至少一个凹槽,并且没有凹槽延伸远到该粘合剂层的一个侧部边缘。本发明进一步涉及具有表面的隔离衬垫,该表面具有至少一个脊部,其中没有脊部延伸远到该剥离衬垫的一个侧部边缘。
Description
本发明处于胶带的技术领域内。本发明特别涉及在粘合剂层的表面中具有特定形貌的胶带。
胶带以广泛多种方式用于结合(join)基底,而且还用作例如遮蔽带或绝缘带。粘合剂和基底之间的接触面的性质在用胶带粘结(bond)方面起到重要的作用。该接触面可能会受到多种外部影响的不利影响,这些影响一般导致有效接触面积减小,继而造成目标粘结质量降低。例如可能由于粘合剂和基底之间的空气夹杂(inclusion)而使接触面积减小。这通常表现为粘结不精确和/或粘结缺乏强度和耐久性。
待粘结基底的精确定位在例如胶版印刷工艺中是至关重要的。这些是使用由感光聚合物或橡胶制成的柔性印刷板的旋转印刷工艺,该板具有与印刷施加的信息相对应的浮雕。这些印刷板或印刷版(printing form)固定在印刷胶辊(printing cylinder)上。这是使用胶带进行的,取决于胶带的可压缩性质,所述胶带会大大影响印刷质量。
在印刷工艺中,随后使印刷板通过油墨池,其中该浮雕吸取印刷油墨。然后该印刷胶辊将该印刷板输送到转印站,在此处包含印刷油墨的表面与待印刷的基底接触。在将印刷板从基底上移除时,印刷油墨的膜裂开并留下与该印刷板表面上存在的浮雕相对应的印记。油墨转印需要精确监控在将印刷板放置到基底上时所施加的压力,该压力实质决定施印的厚度和印刷图像的均匀度。
通常使用双面胶带将印刷板固定在印刷胶辊上。为了确保高的印刷质量,该印刷板必须非常小心地安装在印刷胶辊上并精确定位。通常需要必须对该板的位置调节多次。在将该板安装在印刷胶辊上的过程中以及在可能的再次定位的过程中,在印刷板和胶带之间和/或胶带和载体或印刷胶辊之间的界面处通常会发生空气的夹杂。这种气泡会导致在将该印刷板放置到基底上时所施加的压力的变化,并构成了胶版印刷工艺中一个最常见的误差来源。
尽管在原理上可以使用注射器或刮刀除去夹杂的气泡,但这些工具也可能对印刷板造成损伤。因此已经尝试了通过特定的胶带构造来阻止气泡的夹杂。例如,使用了这样的胶带:其具有平行条纹或波纹图案的粘合剂。然而这种胶带被证实在所实现的粘结质量方面缺乏足够的可靠性。尽管其允许空气有效地从界面处逃逸,但载体和印刷板之间的粘结效果缺乏足够的可靠性,尤其是在高生产速率时。也尝试了具有粘合剂的不规则浮雕(relief)的胶带,但同样得到不足的粘结强度,而且在某些区域中仍然具有空气的夹杂。
US 5,296,277描述了在粘合剂层中具有多个高台(elevation)的胶带,这些高台具有平坦的粘合剂顶部,其面积小于粘合剂层总面积的25%。
US 5,362,516描述了借助于小珠使粘合剂层的表面结构化,这些小珠预先施加,然后在其上散布粘合剂。类似的结构是US 5,141,790的主题,在这种情况中结构化是通过引入粘合剂层中且其顶部基本不含粘合剂的颗粒实现的。
GB 1511060描述了具有至少一个较长脊部(ridge)或切口的粘合剂层,这些结构中的至少一个突破了该粘合剂层的外边缘。
US 5,268,228描述了在一侧或两侧上的粘合剂层中具有接缝(joint)的双面胶带,这些接缝的目的是在粘合过程中转移空气,且其尺寸使其在粘合之后在很大程度上消失。
WO 98/29516 A1也涉及具有压纹浮雕的粘合剂层,且描述了用于控制粘合表面的形貌的方法,其中该粘合剂层的浮雕或形貌控制了粘结性能。
WO 02/11985 A1描述了用于胶版印刷工艺中的胶带,该胶带具有永久通道的规则图案。进一步地,说明书还描述了胶版印刷工艺和用于胶版印刷的设备的其他组件。
目前已知的用于防止空气夹杂的方法用于将空气向外运走。然而,因此频繁发生毛细作用的问题,这种毛细作用的问题可能甚至将空气吸入。由于在粘合剂层中存在的空气去除通道,在润湿区域和/或粘结强度的分布方面通常是不利的,这能够导致粘结不足。例如,空气可能根本没有朝外部除去,而是仅在粘合剂层内转移到下一个空腔中。此处可能会有大量空气聚集,这降低了粘结和/或基底定位的准确性。进一步地,粘合剂和基底之间实际实现的接触面积大大依赖于所施加的压力。
因此本发明的目的是提供能够克服上述问题的胶带。该胶带特别用于阻止由于普遍施加的压力造成的空气气泡在该胶带内的移位并允许在很大程度上恒定的粘结面积和粘结强度,而不依赖于所施加的压力。
该目的的实现基于以下思想:不应当将夹杂的空气转移到外部,而是应当转移到并保持在该粘合剂层内限定的凹槽中。因此,本发明的第一主题是包括至少一个粘合剂层的胶带,其中该粘合剂层具有至少一个凹槽且没有凹槽延伸到该粘合剂层的一个侧部边缘(lateral edge)。这种胶带没有毛细作用,因为其不包含任何连续的通道。因此流体(特别是空气)不被吸入粘结区域中。明确划界和限定的粘结区域可以实现具有较恒定的粘结强度的整版(不依赖于所施加的压力),并避免了在普遍施加的压力的影响下在胶带的某些位置处形成新的气泡。
“粘合剂层”表示能够与基底直接接触并粘着(adhere)到其上的本发明的胶带的层。优选依照本发明,该粘合剂层是由压敏粘合剂形成的。这是粘弹性粘合剂,其固化膜在室温在干态时永久保持胶粘性(tacky)和粘着性(adhesive)。粘结是通过立即向有效的全部基底轻轻施加压力而进行的。
本发明的胶带的该至少一个粘合剂层优选包括选自以下的聚合物:天然橡胶、合成橡胶、聚丙烯酸酯、有机硅和上述聚合物中两种或更多种的混合物。更优选地,基于该粘合剂层的总重量计,本发明的胶带的该至少一个粘合剂层包括至少30wt%(更优选至少40wt%,更特别地至少50wt%)的程度的选自以下的聚合物:天然橡胶、合成橡胶、聚丙烯酸酯、有机硅和上述聚合物中两种或更多种的混合物。
合成橡胶优选包括苯乙烯-丁二烯共聚物、嵌段共聚物例如苯乙烯-异戊二烯-苯乙烯、苯乙烯-丁二烯-苯乙烯、苯乙烯-乙烯/丁烯-苯乙烯、苯乙烯-乙烯/丙烯-苯乙烯以及上述共聚物的组合。合成橡胶和天然橡胶通常与至少一种粘结强度增强树脂一起使用。预期的粘结强度增强树脂的实例包括不饱和C5-C9烃的聚合物、萜烯树酯和松香。
“聚丙烯酸酯”表示这样的聚合物:其单体基于物质量计由至少30%的丙烯酸、甲基丙烯酸、丙烯酸酯和/或甲基丙烯酸酯的程度构成,其中丙烯酸酯和/或甲基丙烯酸酯通常至少成比例存在且优选以至少30%的程度存在。更特别地,“聚丙烯酸酯”是可由丙烯酸系和/或甲基丙烯酸系单体以及进一步非必要的可共聚单体的自由基聚合得到的聚合物。
优选使用能够追溯到以下单体组合物的聚丙烯酸酯:
a)下式的丙烯酸酯和/或甲基丙烯酸酯:
CH2=C(RI)(COORII)
其中RI是H或CH3,且RII是具有4-14个C原子的烷基,
b)具有对例如环氧化物基团具有反应性的官能团的烯属不饱和单体,
c)非必要地其他可与组分(a)共聚的丙烯酸酯和/或甲基丙烯酸酯和/或烯属不饱和单体。
为了将聚丙烯酸酯作为压敏粘合剂应用,选择相应组分(a)、(b)和(c)的比例,使得聚合产物特别具有≤15℃(在低频时的DMA)的玻璃态转变温度。
为了制备压敏粘合剂,选择份数为45-99wt%的组分(a)的单体、份数为1-15wt%的组分(b)的单体和份数为0-40wt%的组分(c)的单体是非常有利的(该数值是基于用于“基础聚合物”的单体混合物计的,换言之,在未向完成的聚合物添加可能的添加剂例如树脂等的情况下)。
特别地,组分(a)的单体是增塑和/或非极性单体。优选用作单体(a)的是具有由4-14个C原子(更优选4-9个C原子)构成的烷基的丙烯酸的和甲基丙烯酸的酯。这种单体的实例是丙烯酸正丁酯、甲基丙烯酸正丁酯、丙烯酸正戊酯、甲基丙烯酸正戊酯、丙烯酸正戊酯、丙烯酸正己酯、甲基丙烯酸己酯、丙烯酸正庚酯、丙烯酸正辛酯、甲基丙烯酸正辛酯、丙烯酸正壬酯、丙烯酸异丁酯、丙烯酸异辛酯、甲基丙烯酸异辛酯及其支化异构体,例如丙烯酸2-乙基己酯或甲基丙烯酸2-乙基己酯。
特别地,组分(b)的单体是具有官能团(特别地,具有能够参与与环氧化物基团的反应的官能团)的烯属不饱和单体。
对于组分(b),优选使用具有官能团的单体,所述官能团选自包括以下官能团的组:羟基、羧基、磺酸或膦酸基团、酸酐、环氧化物、胺。
特别优选的组分(b)的单体的实例是丙烯酸、甲基丙烯酸、衣康酸、马来酸、富马酸、巴豆酸、乌头酸、二甲基丙烯酸、β-丙烯酰氧基丙酸、三氯丙烯酸、乙烯基乙酸、乙烯基膦酸、衣康酸、马来酸酐、丙烯酸羟乙酯、丙烯酸羟丙酯、甲基丙烯酸羟乙酯、甲基丙烯酸羟丙酯、甲基丙烯酸6-羟基己酯、烯丙醇、丙烯酸缩水甘油酯、甲基丙烯酸缩水甘油酯。
在原理上,可以使用所有能与组分(a)和/或组分(b)共聚的乙烯基官能化合物作为组分(c)。组分(c)的单体可以用于调节所得到的压敏粘合剂的性质。
组分(c)的单体的实例如下:
丙烯酸甲酯、丙烯酸乙酯、丙烯酸丙酯、甲基丙烯酸甲酯、甲基丙烯酸乙酯、丙烯酸苯甲酯、甲基丙烯酸苯甲酯、丙烯酸仲丁酯、丙烯酸特丁酯、丙烯酸苯酯、甲基丙烯酸苯酯、丙烯酸异冰片酯、甲基丙烯酸异冰片酯、丙烯酸特丁基苯酯、甲基丙烯酸特丁基苯酯、甲基丙烯酸十二烷基酯、丙烯酸异癸酯、丙烯酸月桂酯、丙烯酸正十一烷基酯、丙烯酸硬脂酯、丙烯酸十三烷基酯、丙烯酸山嵛酯、甲基丙烯酸环己酯、甲基丙烯酸环戊酯、丙烯酸苯氧基乙酯、甲基丙烯酸苯氧基乙酯、甲基丙烯酸2-丁氧基乙酯、丙烯酸2-丁氧基乙酯、丙烯酸3,3,5-三甲基环己酯、丙烯酸3,5-二甲基金刚烷基酯、甲基丙烯酸4-异丙苯基苯酯、丙烯酸氰乙酯、甲基丙烯酸氰乙酯、丙烯酸4-联苯基酯、甲基丙烯酸4-联苯基酯、丙烯酸2-萘基酯、甲基丙烯酸2-萘基酯、丙烯酸四氢糠基酯、丙烯酸二乙基氨基乙酯、甲基丙烯酸二乙基氨基乙酯、丙烯酸二甲基氨基乙酯、甲基丙烯酸二甲基氨基乙酯、丙烯酸2-丁氧基乙酯、甲基丙烯酸2-丁氧基乙酯、3-甲氧基丙烯酸甲酯、丙烯酸3-甲氧基丁酯、丙烯酸苯氧基乙酯、甲基丙烯酸苯氧基乙酯、甲基丙烯酸2-苯氧基乙酯、甲基丙烯酸丁基二甘醇酯、丙烯酸乙二醇酯、丙烯酸乙二醇单甲醚酯(ethyleneglycol monomethyl acrylate)、甲氧基聚乙二醇甲基丙烯酸酯350、甲氧基聚乙二醇甲基丙烯酸酯500、丙二醇一甲基丙烯酸酯、丁氧基二乙二醇甲基丙烯酸酯、乙氧基三乙二醇甲基丙烯酸酯、丙烯酸八氟戊酯、甲基丙烯酸八氟戊酯、甲基丙烯酸2,2,2-三氟乙酯、丙烯酸1,1,1,3,3,3-六氟异丙酯、甲基丙烯酸1,1,1,3,3,3-六氟异丙酯、甲基丙烯酸2,2,3,3,3-五氟丙酯、甲基丙烯酸2,2,3,4,4,4-六氟丁酯、丙烯酸2,2,3,3,4,4,4-七氟丁酯、甲基丙烯酸2,2,3,3,4,4,4-七氟丁酯、甲基丙烯酸2,2,3,3,4,4,5,5,6,6,7,7,8,8,8-十五氟辛酯、二甲基氨基丙基丙烯酰胺、二甲基氨基丙基甲基丙烯酰胺、N-(1-甲基十一烷基)丙烯酰胺、N-(正-丁氧基甲基)丙烯酰胺、N-(丁氧基甲基)甲基丙烯酰胺、N-(乙氧基甲基)丙烯酰胺、N-(正-十八烷基)丙烯酰胺、以及N,N-二烷基取代的酰胺(例如N,N-二甲基丙烯酰胺、N,N-二甲基甲基丙烯酰胺)、N-苯甲基丙烯酰胺、N-异丙基丙烯酰胺、N-特丁基丙烯酰胺、N-特辛基丙烯酰胺、N-羟甲基丙烯酰胺、N-羟甲基甲基丙烯酰胺、丙烯腈、乙烯基醚(例如乙烯基甲基醚、乙基乙烯基醚、乙烯基异丁基醚)、乙烯基酯(乙酸乙烯酯)、氯乙烯、卤乙烯、偏氯乙烯、偏卤乙烯、乙烯基吡啶、4-乙烯基吡啶、N-乙烯基邻苯二甲酰亚胺、N-乙烯基内酰胺、N-乙烯基吡咯烷酮、苯乙烯、邻-和对-甲基苯乙烯、邻-丁基苯乙烯、4-正丁基苯乙烯、4-正癸基苯乙烯、3,4-二甲氧基苯乙烯、大分子单体,例如甲基丙烯酸2-聚苯乙烯乙酯(分子量Mw为4000-13000g/mol)、甲基丙烯酸聚(甲基丙烯酸甲酯)乙酯(Mw为2000-8000g/mol)。
组分(c)的单体也可以有利地选择使其包含支持随后的辐射交联(例如通过电子束、UV)的官能团。适合的可共聚光引发剂例如是苯偶姻丙烯酸酯和丙烯酸酯官能化的二苯甲酮衍生物。支持通过电子束轰击交联的单体例如为丙烯酸四氢糠基酯、N-特丁基丙烯酰胺和丙烯酸烯丙酯。
该聚丙烯酸酯可以通过技术人员熟知的方法制备,尤其有利的是通过常规自由基聚合或受控自由基聚合制备。该聚丙烯酸酯可以通过以下方法制备:使用常规聚合引发剂以及非必要的链转移剂使该单体组分共聚,聚合是在常规温度在本体中、在乳液中、在水或例如液态烃中或在溶液中进行的。
该聚丙烯酸酯的重均分子量Mw优选在20000-2000000g/mol范围内,非常优选在100000-1000000g/mol范围内,非常优选在150000-500000g/mol范围内[说明书中的平均分子量Mw和多分散度PD的数值涉及通过凝胶渗透色谱法测定]。为此目的,为了设定所需的平均分子量,在适合的链转移剂(例如硫醇、卤素化合物和/或醇)存在下进行聚合可能是有利的。
有机硅优选是数均分子量为约5000-约10000000(更特别地约50000-约1000000)的聚二有机硅氧烷和/或数均分子量为约100-约1000000(更特别地为约500-约50000)的共聚有机硅树脂(也称作MQ树脂)。该MQ树脂包含三有机甲硅烷氧基单元以及SiO4/2单元。基于有机硅的压敏粘合剂通常包括20-60重量份聚二有机硅氧烷和40-80重量份一种或多种MQ树脂。目标通常是聚二有机硅氧烷与MQ树脂反应以形成粘合性质。这种反应例如可以是MQ树脂中存在的硅烷醇官能团和二有机聚硅氧烷的端硅烷醇基团之间的缩合反应。另一可能的反应路径是通过该聚二有机硅氧烷的烯基官能团和MQ树脂的SiH、烯基和/或硅烷醇官能团之间的加成反应形成的。
本发明的胶带的该至少一个粘合剂层可以包括可能有助于提高该粘合剂层的特定性质的添加剂。这些添加剂例如可以是颜料、增塑剂、填料、稳定剂、抗氧化剂等。基于该粘合剂层的总重量计,该粘合剂层中添加剂的比例优选为0.1-50wt%。
该粘合剂层的每单位面积的重量优选不超过200g/m2,更优选不超过100g/m2,更优选为40-100g/m2,例如60-100g/m2。给出的每单位面积的重量涉及该粘合剂层的完全压纹区域,因此不涉及依照本发明提供的凹槽。
同样优选地,该粘合剂层是连贯(coherent)粘合剂层。这表示平行于其表面的粘合剂层具有粘合剂层连续存在(即在任何位置都未中断)的平面。连贯粘合剂层当然将具有依照本发明提供的一个或多个凹槽,但在连贯粘合剂层的情况下,这些凹槽不能太深从而使该粘合剂层中断。因此假设该粘合剂层的表面基本位于x-y平面中,那么在连贯粘合剂层的情况中,在限定的深度z中的平行于x-y平面的剖面必须使得在该剖面中每个点都存在粘合剂。该粘合剂层的表面被认为是与在粘合剂层朝向待粘结的基底的一面上的周围介质的边界;对于涉及表面积的计算和定义,将凹槽占据的表面积等于位于粘合剂层平面中的凹槽“底部面积”。因此,在凹槽的情况中,该表面区域将被认为在与该包括粘合剂的表面相同的平面中是连续的。
依照本发明的胶带可以是单面或双面胶带。
“凹槽”表示在粘合剂层内的可宏观感知的从该粘合剂层的表面开始的凹入,且在原理上可以具有任意适合的形状和深度。使用在与凹槽的运行方向呈90°角的层顺序方向上通过本发明的胶带的切口来表示,图1示例了在粘合剂层中的多个不同的凹槽。该图中的参考编号具有以下含义:
1-载体
2-粘合剂层
3-凹槽。
优选依照本发明,该凹槽的深度为至少10μm,更优选至少20μm,更特别地至少25μm,例如至少30μm。该“凹槽的深度”表示与该粘合剂层的表面所位于的平面相垂直的凹槽的最大尺度。该粘合剂层的表面位于该粘合剂层朝向基底一侧上。同样优选地,该凹槽的深度不超过200μm,更优选不超过100μm,更特别地不超过60μm,例如不超过50μm。
进一步地,所有凹槽的深度的变化优选不超过20%。以这种方式实现的均匀的形貌确保在该胶带的全部范围上具有一致的粘结性质。
优选依照本发明,该凹槽的宽度为10-200μm。该“凹槽的宽度”表示在与凹槽的运行方向呈90°角的方向上在该凹槽内的任意适合的位置处该凹槽的边缘距彼此的最大距离。
使用平行于层顺序且在与凹槽的运行方向呈90°角的方向上通过本发明的胶带的切口来表示,图2示例了术语“凹槽的深度”和“凹槽的宽度”的含义。该图中的参考编号的含义如下:
依照本发明,没有凹槽延伸到粘合剂层的一个侧部边缘。这表示没有凹槽与限制该粘合剂层的表面或位于该表面之下并与该表面的平面平行的该粘合剂层的任意面的边缘接触。而是在凹槽和边缘之间总是存在至少最少量的粘合剂。因此本发明的胶带的凹槽结构的设计与提供与侧部边缘接触以将空气运送出去的连续通道的常规形貌是不同的。使用本发明的胶带,能够避免已经列出的这种设计的缺点,而不含影响粘结质量的空气夹杂。该胶带的侧部边缘与该凹槽之间的间距优选至少1mm。
被本发明的胶带封入的空气体积以及可达到的基底润湿面积优选与彼此有一定的比例,使得在组合件操作中以及在胶带的使用过程中发生的压应力和剪切应力不能使该空气移位。该粘合剂层中未设有凹槽的表面优选为该粘合剂层的总表面积的50%-99%,更特别为其70%-95%,非常优选为其75%-90%。
该至少一个凹槽优选是永久凹槽。这表示设定该粘合剂层的流变性质,以使该由一个或多个凹槽确定的粘合剂层形貌在本发明的胶带的预期使用过程中在其基本程度上永久保持。更优选地,“永久凹槽”表示甚至在该胶带在多次使用之后或者在使用较长时间之后(例如在20-80℃使用几个小时之后)该形貌仍在其基本程度上保持。该一个或多个凹槽的这种永久性确保了即使该胶带经受多次或较长持续时间的应力,空气仍能够容纳在用于此目的的凹入中,因此可以实现精确的粘合剂粘结。
该凹槽的剖面几何形状在原理上是可自由选择的,且可以包括例如线、圆、多边形和/或无定形结构。也可以是标记、标识等。重复图案可以彼此结合或与彼此分开存在。图3-5显示了在各种情况中本发明的胶带的设有凹槽的粘合剂层的平面图并示例了可能的凹槽形状。图3显示了与彼此分开存在的重复形状。图4显示了与彼此部分分开并与彼此部分结合的重复凹槽形状。图5显示了与彼此分开存在的不同的凹槽形状。在各种情况中参考编号的含义如下:
2-粘合剂层
3-凹槽。
进一步地,在原理上,在层顺序方向上且与其运行方向呈90°角的剖面中,该凹槽同样可以具有任意适合的形状,例如包括三角形、矩形或半圆形的变形。从图1中已经呈现了这些形状中的一些。
本发明的胶带可以包括其他层。本发明的胶带优选包括在该胶带外侧上与该设有凹槽的粘合剂层相对的另一压敏粘合剂,和/或包括稳定膜(其可以是例如PET膜)和/或泡沫层和/或层压粘合剂。
该另一压敏粘合剂可以是依照本发明的具有凹槽的压敏粘合剂。该稳定膜有利地提高了本发明的胶带的抗张性由此简化了其拆卸。该泡沫层提高了印刷质量。该层压粘合剂特别用于将该稳定膜固定到泡沫体上。
本发明的胶带例如包括以下所述顺序的层:
-设有凹槽的压敏粘合剂
-稳定膜
-层压粘合剂
-泡沫层
-另一压敏粘合剂(设有凹槽的或未设有凹槽的)。
也可以是其中没有层压粘合剂的以上构造,其中该稳定膜仍然在两侧都被聚乙烯层包围,其以例如液体组合物的形式施加到该稳定膜上。
本发明的另一主题是剥离衬垫(release liner),其具有至少一个具有至少一个脊部的特征的表面,其中没有脊部延伸到该剥离衬垫的一个边缘。使用这种剥离衬垫,该脊部限定的结构能够容易地压印到该粘合剂层中,因此能够由此制备上述凹槽图案。
剥离衬垫(下面也简称为衬垫)是具有不粘(阻粘)表面且直接施加到粘合剂上用于临时保护该粘合剂的衬垫材料,其通常能够在该粘合剂即将使用之前通过简单剥落而除去。剥离衬垫尤其确保了该粘合剂在使用之前不被污染。此外,可以通过该剥离材料的性质和组成调节该剥离衬垫,以使该胶带能够用适当的力(容易或困难地)退卷。而且,在双面涂覆粘合剂的胶带的情况中,该剥离衬垫确保在退卷时正确一面的粘合剂首先暴露。
衬垫不是胶带的一部分,而仅仅是对其制备、储存或进一步加工的辅助。进一步地,与胶带载体不同,衬垫并不永久结合到粘合剂的层上,而是该组合件仅是临时性的而非持久的。
“脊部”表示从衬垫的表面开始的可宏观感知的高台,在本发明的范围内其在原理上可以具有任意适合的形状和高度。对于该衬垫中脊部的排列的可能的形式和形状,以上关于粘合剂层的凹槽和凹槽形状进行的评论同样适用。因此该脊部的剖面的几何形状在原理上同样可自由选择,且例如可以包括线、圆、多边形和/或无定形结构。也可以是标记、标识等。重复图案可以彼此结合或与彼此分开存在。例如在横截面中,该脊部包括三角形、矩形或半圆形的变形。
衬垫的“表面”被认为表示该衬垫的两侧各自与周围介质的边界;对于涉及表面积的计算和定义,将脊部占据的面积等于脊部的底部处的底部面积。优选依照本发明,脊部所占据的面积作为该具有至少一个脊部的特征的衬垫表面的比例为1%-50%,更优选5%-30%,更特别地为10%-25%。“脊部所占据的面积”是被脊部所占据的所述表面的底部面积;脊部本身的表面积在本申请中是不重要的。
依照本发明,没有脊部延伸到剥离衬垫的一个侧部边缘。在与本发明的胶带的凹槽形状相对应的意义上,这表示没有脊部与限制该衬垫的表面的边缘接触。
本发明的剥离衬垫的脊部的高度优选为10-200μm,更优选20-100μm,更特别地为25-60μm,例如30-50μm。该“脊部的高度”表示与该衬垫的表面所处的平面垂直的脊部的最大尺度。
在脊部的底部处该脊部的宽度优选为10-200μm。该“脊部的宽度”表示在与脊部的运行方向呈90°角的方向上在该脊部上的任意适合的位置处该脊部的底部处的两点之间距彼此的最大距离。
对本发明的衬垫的脊部和本发明的胶带的凹槽的尺度的测量(特别是对脊部的高度和凹槽的深度的测量)是借助于扫描电子显微术(SEM)实现的。
本发明的衬垫可以在一面或两面上包括至少一个脊部。
本发明的衬垫优选包括至少一个载体和至少一个剥离材料。
本发明的衬垫的载体材料优选包括选自以下的聚合物:聚丙烯(更特别地为单轴和双轴取向聚丙烯)、聚对苯二甲酸乙二醇酯、聚乙烯、聚氯乙烯和上述聚合物中两种或更多种的混合物。更优选地,本发明的衬垫的载体材料包括至少30wt%(更优选至少50wt%,更特别地至少70wt%,例如至少90wt%)的选自以下的聚合物:聚丙烯(更特别地为单轴和双轴取向聚丙烯)、聚对苯二甲酸乙二醇酯、聚乙烯、聚氯乙烯和上述聚合物中两种或更多种的混合物。该衬垫的载体材料更优选包括聚丙烯或具有以下序列的三层挤出物:聚乙烯-聚丙烯-聚乙烯。
作为剥离剂或剥离材料,在原理上可以使用技术人员已知的所有系统。该剥离剂优选选自:有机硅、氟化有机硅、有机硅共聚物、蜡、氨基甲酸酯或所述物质中两种或更多种的混合物。
该剥离剂可以包括溶剂基和/或无溶剂系统,优选溶剂基系统。进一步地,该剥离剂可以是辐射交联的(通过UV或电子束)、缩合交联的或加成交联的,优选其是缩合交联的。
使用的剥离剂优选是可交联的有机硅系统。这些包括交联催化剂和被称作可热固化的缩合交联或加成交联聚硅氧烷的混合物。对于缩合交联有机硅系统,通常在组合物中存在锡化合物(例如二乙酸二丁基锡)作为交联催化剂。
本发明的衬垫也可以包括涂有一种上述剥离剂的纸。
不考虑脊部,该衬垫的厚度优选为20-200μm。
本发明的另一主题是在粘合剂的表面中产生至少一个凹槽的方法,至少包括:
将材料的具有至少一个脊部的特征的表面与粘合剂层的表面以下面的方式接触:该材料的具有至少一个脊部的特征的表面在该粘合剂层的表面中产生基本上与该材料的具有至少一个脊部的特征的表面的形貌相反的凹槽形貌;
并且没有凹槽延伸到该粘合剂层的一个侧部边缘。以上对术语例如“凹槽”、“表面”等的定义适用于全文。
材料的上述表面优选是在本发明的剥离衬垫上的具有至少一个脊部的特征的表面。本发明的衬垫的表面上的脊部形貌例如可以通过成型(压花法)、初步成形(primary forming)(流延薄膜)或通过印刷得到。
依照本发明的方法,可以通过用该粘合剂直接涂覆该衬垫或者通过层压将其与粘合剂直接接触而将该衬垫的形貌传递给粘合剂层。
本发明的另一主题是组合件,其包括本发明的剥离衬垫和与该剥离衬垫的具有至少一个脊部的表面直接接触的粘合剂层,该粘合剂层的形貌基本上与该具有至少一个脊部的特征的剥离衬垫的表面的形貌相反。
Claims (15)
1.一种胶带,其包括至少一个粘合剂层,其中该粘合剂层具有至少一个凹槽,且没有凹槽延伸到该粘合剂层的侧部边缘之一。
2.权利要求1的胶带,其特征在于该粘合剂层是连贯粘合剂层。
3.前述权利要求中的至少一项的胶带,其特征在于该粘合剂层是由压敏粘合剂形成的。
4.前述权利要求中的至少一项的胶带,其特征在于该粘合剂层上未开设凹槽的表面积为该粘合剂层总表面积的50%-99%。
5.前述权利要求中的至少一项的胶带,其特征在于该凹槽的深度为至少10μm。
6.前述权利要求中的至少一项的胶带,其特征在于该凹槽的深度不超过100μm。
7.前述权利要求中的至少一项的胶带,其特征在于该凹槽的宽度为10-200μm。
8.前述权利要求中的至少一项的胶带,其特征在于该至少一个凹槽是永久凹槽。
9.一种剥离衬垫,其具有表面,该表面具有至少一个脊部的特征,其中没有脊部延伸到该剥离衬垫的侧部边缘之一。
10.权利要求9的剥离衬垫,其特征在于脊部所占据的面积作为具有至少一个脊部的特征的剥离衬垫的表面面积的比例为1%-50%。
11.权利要求9和10中至少一项的剥离衬垫,其特征在于该脊部的高度为10-100μm。
12.权利要求9-11中至少一项的剥离衬垫,其特征在于在该脊部的底部处的该脊部的宽度为10-200μm。
13.一种组合件,其包括权利要求9-12中至少一项的剥离衬垫和与具有至少一个脊部的特征的该剥离衬垫的表面直接接触的粘合剂层,该粘合剂层的形貌基本上与具有至少一个脊部的特征的该剥离衬垫的表面的形貌相反。
14.在粘合剂的表面中产生至少一个凹槽的方法,至少包括:
将材料的具有至少一个脊部的特征的表面与粘合剂层的表面以下面的方式接触:该材料的具有至少一个脊部的特征的表面在该粘合剂层的表面中产生基本上与该材料的具有至少一个脊部的特征的表面的形貌相反的凹槽形貌;
并且没有凹槽延伸到该粘合剂层的侧部边缘之一。
15.权利要求14的方法,其特征在于该材料的表面是权利要求9-12中至少一项的剥离衬垫的具有至少一个脊部的特征的表面。
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