CN106795397A - 用于触摸屏面板的粘合剂组合物、光学粘合膜和触摸屏面板 - Google Patents
用于触摸屏面板的粘合剂组合物、光学粘合膜和触摸屏面板 Download PDFInfo
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Abstract
本发明提供了粘合剂组合物,其包含:(甲基)丙烯酸酯类可光固化树脂;和不含氧双官能二烯类橡胶硬化剂。
Description
技术领域
本发明涉及用于触摸屏面板的粘合剂组合物、光学粘合膜和触摸屏面板。
背景技术
近来,电子装置例如PDA、移动通信终端或用于车辆的导航***正在形成大市场。在这些电子装置中,追求的技术目标的实例通常包括:更薄的装置、更轻的装置、功率消耗降低、高分辨装置、高亮度装置,等等。
同时,透明导电塑料膜被用于其中触摸屏或触摸面板开关安装在输入操作部分的电子装置中,以使装置更轻并防止装置破裂。其实例包括这样的膜:使用聚对苯二甲酸乙二醇酯(PET)膜作为基材,并且在PET膜的一个表面上形成有导电层例如氧化铟锡(ITO),并且所述膜通过粘合层层合在导电玻璃、增强材料、装饰膜等之上。
粘合层需要多种物理性质,例如触摸敏感性和耐久性。
发明内容
技术问题
本发明的一个示例性实施方案提供了具有优异触摸敏感性和优异可靠性的粘合剂组合物。
本发明的另一个示例性实施方案提供了由粘合剂组合物制备的光学粘合膜。
本发明的又一个示例性实施方案提供了触摸屏面板,向其施用由用于触摸屏面板的粘合剂组合物所制备的光学粘合膜。
技术方案
本发明的一个示例性实施方案提供了粘合剂组合物,其包含:(甲基)丙烯酸酯类可光固化树脂;和不含氧双官能二烯类橡胶硬化剂。
不含氧双官能二烯类橡胶硬化剂可在其两端均包含二烯类双官能基团。
不含氧双官能二烯类橡胶硬化剂可包含选自以下的一者,例如:双官能聚丁二烯、双官能异戊二烯橡胶、双官能异丁烯-异戊二烯橡胶、或双官能苯乙烯-丁烯橡胶、或其组合。
不含氧双官能二烯类橡胶硬化剂的重均分子量可为3,000至20,000。
不含氧双官能二烯类橡胶硬化剂在100kHz的频率下测量的介电常数k值可为2.1至2.5。
粘合剂组合物可包含100重量份(甲基)丙烯酸酯类可光固化树脂;和0.1重量份至2重量份不含氧双官能二烯类橡胶硬化剂。
(甲基)丙烯酸酯类可光固化树脂可以是其中(甲基)丙烯酸酯单体与可交联单体彼此共聚的树脂,所述可交联单体包括选自以下的至少一者:含羟基单体、含羧基单体、或含氮单体、及其组合。
(甲基)丙烯酸酯单体为(甲基)丙烯酸烷基酯,并且所述(甲基)丙烯酸烷基酯的烷基可为直链或支化C1至C14烷基。
(甲基)丙烯酸酯单体可包括选自以下的一者:(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸正丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸叔丁酯、(甲基)丙烯酸仲丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸2-乙基丁酯、(甲基)丙烯酸正辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸异冰片酯、(甲基)丙烯酸异壬酯及其组合。
可交联单体可包括选自以下的一者:(甲基)丙烯酸2-羟基乙酯、(甲基)丙烯酸2-羟基丙酯、(甲基)丙烯酸4-羟基丁酯、(甲基)丙烯酸6-羟基己酯、(甲基)丙烯酸8-羟基辛酯、(甲基)丙烯酸2-羟基乙二醇酯、(甲基)丙烯酸2-羟基丙二醇酯、丙烯酸、甲基丙烯酸、2-(甲基)丙烯酰氧基乙酸、3-(甲基)丙烯酰氧基丙酸、4-(甲基)丙烯酰氧基丁酸、丙烯酸二聚体、衣康酸、马来酸、(甲基)丙烯酸2-异氰酰基乙酯、(甲基)丙烯酸3-异氰酰基丙酯、(甲基)丙烯酸4-异氰酰基丁酯、(甲基)丙烯酰胺、N-乙烯基吡咯烷酮、N-乙烯基己内酰胺及其组合。
粘合剂组合物还可包含光引发剂。
光引发剂可包括选自以下的一者:苯偶姻类引发剂、羟基酮类引发剂、氨基酮类引发剂、己内酰胺及其组合。
本发明的另一个示例性实施方案提供了光学粘合膜,其包含:含有粘合剂组合物的光固化产物的粘合层。
本发明的又一个示例性实施方案提供了触摸屏面板,其包含:在其一个表面上形成有导电层的导电塑料膜层;层合在所述导电层上部的光学粘合膜;以及层合在所述光学粘合膜上部的覆盖窗口层。
导电塑料膜层可为在其一个表面上形成有导电金属氧化物层的聚对苯二甲酸乙二醇酯膜。
覆盖窗口层可为替代玻璃或钢化玻璃的透明塑料膜。
有益效果
由粘合剂组合物制备的光学粘合膜具有优异的触摸敏感性和优异的可靠性。
附图说明
图1为根据本发明的一个示例性实施方案的触摸屏面板的示意性截面图。
具体实施方式
下文中,将详细描述本发明的示例性实施方案。然而,这些示例性实施方案作为实例提出,本发明不受其限制,并且本发明仅由下文描述的权利要求的范围限定。
本发明提供了粘合剂组合物,其包含:(甲基)丙烯酸酯类可光固化树脂;和不含氧双官能二烯类橡胶硬化剂。
当制备显示装置(例如,移动电话和平板PC)的触摸屏面板时,可由粘合剂组合物制备用作粘结导电塑料膜层和覆盖窗口层的粘结介质的光学粘合膜,所述导电塑料膜层在其一个表面上形成有导电层。
光学粘合膜可通过使粘合剂组合物的(甲基)丙烯酸酯类可光固化树脂光固化来形成,并且光学粘合膜光学上清晰地形成并因此可应用于触摸屏面板,并且还具有低介电常数。如上所述具有低介电常数的光学粘合膜因触摸敏感性提高而有用地应用于触摸屏面板。
粘合剂组合物中的不含氧双官能二烯类橡胶硬化剂是具有低介电常数的材料,并且有助于实现光学粘合膜的低介电常数。
不含氧双官能二烯类橡胶硬化剂是双官能的,同时具有低介电常数,并因此可在硬化期间充当(甲基)丙烯酸酯类可光固化树脂间的交联剂。
特别地,不含氧双官能二烯类橡胶硬化剂可在其两端均包含二烯类双官能基团。
不含氧双官能二烯类橡胶硬化剂不包含具有高电负性的氧,并因此可实现作为非极性的低介电常数。
由于不含氧双官能二烯类橡胶硬化剂如上所述具有双官能度,因此不含氧双官能二烯类橡胶硬化剂可用作交联剂,但不需为三官能或更高的多官能的。即,不含氧双官能二烯类橡胶硬化剂适合用于制备粘合膜,因为不含氧双官能二烯类橡胶硬化剂是双官能的,并因此与(甲基)丙烯酸酯类可光固化树脂结合。这是因为(甲基)丙烯酸酯类可光固化树脂在固化后具有一定程度的硬度,并且如果使用三官能或更高的多官能化合物作为硬化剂,则交联位点延长,使得由其制备的粘合膜过度硬化,并因此不适合作为粘合膜。
因此,除了在其两端的二烯类官能团以外,不含氧双官能二烯类橡胶硬化剂可不包含其他官能团。
不含氧双官能二烯类橡胶硬化剂的重均分子量可为约3,000至约20,000。即,不含氧双官能二烯类橡胶硬化剂是具有所述重均分子量水平的二烯类橡胶化合物,并且可以是树脂或低聚物的形式。重均分子量在所述范围内的不含氧双官能二烯类橡胶硬化剂可适当地充当硬化剂。
不含氧双官能二烯类橡胶硬化剂在100kHz的频率下测量的介电常数k值可为约2.1至约2.5。
不含氧双官能二烯类橡胶硬化剂可包括双官能聚丁二烯、双官能异戊二烯橡胶、双官能异丁烯-异戊二烯橡胶、双官能苯乙烯-丁烯橡胶等或其组合。
如上所述,用于触摸屏面板的粘合剂组合物包含不含氧双官能二烯类橡胶硬化剂,并因此可制备成具有低介电常数,并且特别地,可制备成在100kHz的频率下测量的介电常数k值为3.0或更小。由具有低介电常数的用于触摸屏面板的粘合剂组合物制备的光学粘合膜具有优异的触摸敏感性。
粘合剂组合物可包含:约100重量份(甲基)丙烯酸酯类可光固化树脂;和约0.1重量份至约2重量份不含氧双官能二烯类橡胶硬化剂。
(甲基)丙烯酸酯类可光固化树脂可以是其中(甲基)丙烯酸酯单体与可交联单体彼此共聚的树脂,所述可交联单体包括选自以下的至少一者:含羟基单体、含羧基单体、或含氮单体、及其组合。
(甲基)丙烯酸酯单体具体为(甲基)丙烯酸烷基酯,并且(甲基)丙烯酸烷基酯的烷基可为直链或支化C1至C14烷基。
(甲基)丙烯酸酯单体可为(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸正丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸叔丁酯、(甲基)丙烯酸仲丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸2-乙基丁酯、(甲基)丙烯酸正辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸异冰片酯、(甲基)丙烯酸异壬酯等,或者可包括其组合。
可交联单体意指分子结构中包含可共聚官能团(例如,碳-碳双键)和可交联官能团二者的单体。
可交联单体可包括选自以下的一者,例如:含羟基单体、含羧基单体、或含氮单体、及其组合,且不限于此。
可交联单体可为,具体地,含羟基单体,例如(甲基)丙烯酸2-羟基乙酯、(甲基)丙烯酸2-羟基丙酯、(甲基)丙烯酸4-羟基丁酯、(甲基)丙烯酸6-羟基己酯、(甲基)丙烯酸8-羟基辛酯、(甲基)丙烯酸2-羟基乙二醇酯、和(甲基)丙烯酸2-羟基丙二醇酯;含羧基单体,例如丙烯酸、甲基丙烯酸、2-(甲基)丙烯酰氧基乙酸、3-(甲基)丙烯酰氧基丙酸、4-(甲基)丙烯酰氧基丁酸、丙烯酸二聚体、衣康酸、和马来酸;含氮单体,例如(甲基)丙烯酸2-异氰酰基乙酯、(甲基)丙烯酸3-异氰酰基丙酯、(甲基)丙烯酸4-异氰酰基丁酯、(甲基)丙烯酰胺、N-乙烯基吡咯烷酮、和N-乙烯基己内酰胺;等等,并且可包括选自其组合中的一者。
粘合剂组合物还可包含光引发剂以调节可光固化组合物的聚合度。基于100重量份(甲基)丙烯酸酯类可光固化树脂,光引发剂可以以0.01重量份至10重量份的含量使用,光引发剂的种类没有特别限制,只要光引发剂可通过光辐照产生自由基而引发聚合反应即可,并且光引发剂可包括选自以下的一者,例如:苯偶姻类引发剂、羟基酮类引发剂、氨基酮类引发剂、己内酰胺及其组合。
此外,粘合剂组合物还可在不影响本发明效果的范围内包含选自以下的一种或更多种添加剂:环氧树脂、交联剂、UV稳定剂、抗氧化剂、着色剂、增强剂、填充剂、消泡剂、表面活性剂、增塑剂及其组合。
本发明的另一个示例性实施方案提供了包含粘合剂组合物的光固化产物的光学粘合膜。
用于触摸屏面板的粘合剂组合物可施用于基材层,然后通过光辐照光固化,从而制备光学粘合膜。“光辐照”意指能够通过影响光引发剂或可聚合化合物引起聚合反应的电磁波辐照,并且前述使用的电磁波统称为微波、红外线、UV射线、X射线和γ射线,以及粒子束例如α粒子射线、质子束、中子束和电子束。
用于通过使粘合剂组合物光固化来制备光学粘合膜的方法没有特别限制。例如,光学粘合膜可通过如下方法制备:通过公知的工具(例如,棒涂机)将上述粘合剂组合物或者通过向粘合剂组合物中添加溶剂而制备的涂覆溶液施加在合适的加工基材上,并且使所述粘合剂组合物或涂覆溶液硬化。
在充分除去包含在粘合剂组合物或涂覆溶液中的挥发性组分或气泡诱发组分(例如,反应残余物)之后,可进行硬化过程,从而适当赋予硬化产物交联密度或分子量、弹性模量等,并且防止以下问题:在高温状态下存在于粘合界面的气泡增加,并因此在其中形成散射体,等等。
此外,使粘合剂组合物或涂覆溶液硬化的方法没有特别限制,并且例如,将紫外线照射至粘合剂组合物或由涂覆溶液形成的涂层上,或者在预定条件下进行老化过程,然后可进行硬化过程。
光固化可以通过例如UV辐照来进行。
用于光固化的UV辐照可通过使用常用金属卤化物灯进行约10秒至约15秒。
UV辐射光的量优选地为约0.5J/cm2至约2.0J/cm2,并且更优选地约1.0J/cm2至约1.5J/cm2。
光学粘合膜的厚度可为约50μm至约300μm,特别地,约100μm至约200μm。通过使光学粘合膜具有所述范围内的厚度,可以实现具有优异耐久性同时能够应用于薄型触摸面板或触摸屏的粘合膜。
本发明的又一个示例性实施方案提供了触摸屏面板,其包含:在其一个表面上形成有导电层的导电塑料膜层;层合在所述导电层上部的光学粘合膜;以及层合在所述光学粘合膜上部的覆盖窗口层。
覆盖窗口层可使用钢化玻璃或者替代玻璃的透明塑料膜,所述透明塑料膜被开发为能够替代钢化玻璃的材料。替代玻璃的塑料膜具有多层结构,并且可通过赋予每个层不同的功能而形成。
图1为触摸屏面板100的示意性截面图。
在图1中,触摸屏面板100可包含:覆盖窗口层150;光学粘合膜110;在塑料基材层131的一个表面上形成有导电层132的导电塑料膜层130;和透明基底160。此外,包含上述各层的触摸屏面板100可附接至显示装置,例如液晶显示器(LCD)170。
光学粘合膜110是通过使粘合剂组合物光固化而形成的层,并且对光学粘合膜110的详细描述与上述相同。
导电塑料膜层130的具体种类没有特别限制,并且可使用本领域公知的导电膜。例如,导电膜130可为在其一个表面上形成有ITO电极层作为导电层132的透明塑料膜。具体地,作为形成塑料基材层131的透明塑料膜,可以使用聚对苯二甲酸乙二醇酯膜、聚四氟乙烯膜、聚乙烯膜、聚丙烯膜、聚丁烯膜、聚丁二烯膜、氯乙烯共聚物膜、聚氨酯膜、乙烯-乙酸乙烯酯膜、乙烯-丙烯共聚物膜、乙烯-丙烯酸乙酯共聚物膜、乙烯-丙烯酸甲酯共聚物膜、或聚酰亚胺膜等,并且透明塑料膜不限于此。更具体地,塑料基材层131可为聚对苯二甲酸乙二醇酯(PET)膜。
下文中,将描述本发明的实施例和比较例。然而,以下实施例仅为本发明的实例,并且本发明不限于以下实施例。
(实施例)
实施例1
将85重量份丙烯酸乙基己酯和15重量份丙烯酸羟基丙酯(作为可交联单体)放入1-L玻璃反应器中,并使其热聚合,从而获得粘度为35cP的可光固化丙烯酸类共聚树脂浆料。对于可光固化丙烯酸类共聚树脂浆料,测量的羟基值的计算值为62mg KOH/g。将100重量份(基于固体含量)获得的可光固化丙烯酸类共聚树脂与0.5重量份双官能丁二烯橡胶硬化剂、0.5重量份a,a-甲氧基-a-羟基苯乙酮(Irgacure 651,Ciba SpecialtyChemicalsCo.,Ltd.生产)(作为光引发剂)、和0.35重量份1,6-己二醇二丙烯酸酯(HDDA)(作为交联剂)混合,然后充分搅拌所得混合物,由此制备粘合剂组合物。其后,使粘合剂组合物成膜为100μm的厚度,并使所述膜光固化,由此制备作为固化膜的光学粘合膜。
实施例2
以与实施例1中相同的方式制备可光固化丙烯酸类共聚树脂浆料,并且以与实施例1中相同的方式制备光学粘合膜,不同之处在于:基于100重量份获得的可光固化丙烯酸类共聚树脂,使用2.0重量份双官能丁二烯橡胶硬化剂。
比较例1
以与实施例1中相同的方式制备可光固化丙烯酸类共聚树脂浆料,并且以与实施例1中相同的方式制备光学粘合膜,不同之处在于:基于100重量份获得的可光固化丙烯酸类共聚树脂,使用0.5重量份双官能氨基甲酸酯硬化剂代替双官能丁二烯橡胶硬化剂。
比较例2
以与实施例1中相同的方式制备可光固化丙烯酸类共聚树脂浆料,并且以与实施例1中相同的方式制备光学粘合膜,不同之处在于:基于100重量份获得的可光固化丙烯酸类共聚树脂,使用2.0重量份双官能氨基甲酸酯硬化剂代替双官能丁二烯橡胶硬化剂。
评估
实验例1
在以下装置和条件下使电极与实施例1和2及比较例1和2中制备的每个光学粘合膜的两个表面接触,然后测量介电常数k值并示于下表1中。
装置:Agilent Technologies E4980A LCR meter
测试频率:20Hz至2MHz
电极直径:5mm
实验例2
在通过使用实施例1和2及比较例1和2中制备的光学粘合膜制造玻璃/粘合膜/玻璃的层合结构之后,将所述结构在恒温恒湿器(85℃/85%RH)中静置3天,然后通过肉眼确定是否产生气泡。
实验例3
在通过使用实施例1和2及比较例1和2中制备的光学粘合膜制造玻璃/粘合膜/玻璃的层合结构之后,基于一个循环(-40℃1小时/80℃1小时)进行30个循环,然后通过肉眼确定是否产生气泡,并且结果示于以下表1中。
表1
如从表1中可以看出的,可以确定比较例1中产生气泡并且比较例2中介电常数相对较高,但实施例1和2中未产生气泡,结果,实施例1和2在表现出优异可靠性的同时实现低介电常数。
尽管上文中已详细描述了本发明的优选示例性实施方案,但本发明的权利范围不限于此,并且本领域技术人员使用以下权利要求中定义的本发明基本构思的多种改变和修改也落在本发明的权利范围内。
<附图标记说明>
100:触摸屏面板
110:光学粘合膜
131:塑料基材层
132:导电层
130:导电塑料膜层
150:覆盖窗口层
160:透明基底
170:液晶显示器(LCD)
Claims (16)
1.一种粘合剂组合物,包含:
(甲基)丙烯酸酯类可光固化树脂;和
不含氧双官能二烯类橡胶硬化剂。
2.根据权利要求1所述的粘合剂组合物,其中所述不含氧双官能二烯类橡胶硬化剂在其两端包含二烯类双官能基团。
3.根据权利要求1所述的粘合剂组合物,其中所述不含氧双官能二烯类橡胶硬化剂包含选自以下的一者:双官能聚丁二烯、双官能异戊二烯橡胶、双官能异丁烯-异戊二烯橡胶、双官能苯乙烯-丁烯橡胶及其组合。
4.根据权利要求1所述的粘合剂组合物,其中所述不含氧双官能二烯类橡胶硬化剂的重均分子量为3,000至20,000。
5.根据权利要求1所述的粘合剂组合物,其中所述不含氧双官能二烯类橡胶硬化剂在100kHz的频率下测量的介电常数k值为2.1至2.5。
6.根据权利要求1所述的粘合剂组合物,其中所述粘合剂组合物包含:100重量份所述(甲基)丙烯酸酯类可光固化树脂;和
0.1重量份至2重量份所述不含氧双官能二烯类橡胶硬化剂。
7.根据权利要求1所述的粘合剂组合物,其中所述(甲基)丙烯酸酯类可光固化树脂是其中(甲基)丙烯酸酯单体与可交联单体彼此共聚的树脂,所述可交联单体包括选自以下的至少一者:含羟基单体、含羧基单体、或含氮单体、及其组合。
8.根据权利要求7所述的粘合剂组合物,其中所述(甲基)丙烯酸酯单体为(甲基)丙烯酸烷基酯,并且所述(甲基)丙烯酸烷基酯的烷基为直链或支化C1至C14烷基。
9.根据权利要求7所述的粘合剂组合物,其中所述(甲基)丙烯酸酯单体包括选自以下的一者:(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸正丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸正丁酯、(甲基)丙烯酸叔丁酯、(甲基)丙烯酸仲丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸2-乙基丁酯、(甲基)丙烯酸正辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸异冰片酯、(甲基)丙烯酸异壬酯、及其组合。
10.根据权利要求7所述的粘合剂组合物,其中所述可交联单体包括选自以下的一者:(甲基)丙烯酸2-羟基乙酯、(甲基)丙烯酸2-羟基丙酯、(甲基)丙烯酸4-羟基丁酯、(甲基)丙烯酸6-羟基己酯、(甲基)丙烯酸8-羟基辛酯、(甲基)丙烯酸2-羟基乙二醇酯、(甲基)丙烯酸2-羟基丙二醇酯、丙烯酸、甲基丙烯酸、2-(甲基)丙烯酰氧基乙酸、3-(甲基)丙烯酰氧基丙酸、4-(甲基)丙烯酰氧基丁酸、丙烯酸二聚体、衣康酸、马来酸、(甲基)丙烯酸2-异氰酰基乙酯、(甲基)丙烯酸3-异氰酰基丙酯、(甲基)丙烯酸4-异氰酰基丁酯、(甲基)丙烯酰胺、N-乙烯基吡咯烷酮、N-乙烯基己内酰胺及其组合。
11.根据权利要求1所述的粘合剂组合物,还包含:光引发剂。
12.根据权利要求11所述的粘合剂组合物,其中所述光引发剂包括选自以下的一者:苯偶姻类引发剂、羟基酮类引发剂、氨基酮类引发剂、己内酰胺、及其组合。
13.一种光学粘合膜,包含:
含有根据权利要求1至12中任一项所述的粘合剂组合物的光固化产物的粘合层。
14.一种触摸屏面板,包含:
在其一个表面上形成有导电层的导电塑料膜层;
层合在所述导电层上部的根据权利要求13所述的光学粘合膜;以及
层合在所述光学粘合膜上部的覆盖窗口层。
15.根据权利要求14所述的触摸屏面板,其中所述导电塑料膜层为在其一个表面上形成有导电金属氧化物层的聚对苯二甲酸乙二醇酯膜。
16.根据权利要求14所述的触摸屏面板,其中所述覆盖窗口层为替代玻璃或钢化玻璃的透明塑料膜。
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