CN111684035B - 丙烯酸乳液压敏粘合剂组合物 - Google Patents

丙烯酸乳液压敏粘合剂组合物 Download PDF

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CN111684035B
CN111684035B CN201980009181.5A CN201980009181A CN111684035B CN 111684035 B CN111684035 B CN 111684035B CN 201980009181 A CN201980009181 A CN 201980009181A CN 111684035 B CN111684035 B CN 111684035B
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CN111684035A (zh
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李胜模
梁承勋
朴容秀
黄闰泰
金孝玟
徐成钟
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LG Chem Ltd
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Abstract

本发明提供一种丙烯酸乳液压敏粘合剂组合物。根据本发明,提供一种表现出对疏水性基材和亲水性基材两者的优异的粘合力同时留下较少残留物的压敏粘合剂组合物。

Description

丙烯酸乳液压敏粘合剂组合物
技术领域
相关申请的交叉引用
本申请基于分别在2018年12月18日和2019年9月3日提交的韩国专利申请No.10-2018-0164124和No.10-2019-0109115并要求它们的优先权,这两项专利申请的公开内容通过引用全部并入本说明书中。
本发明涉及一种丙烯酸乳液压敏粘合剂组合物。
背景技术
压敏粘合剂(PSA)是具有在轻微压力下粘附到物质上的性能的材料。PSA是粘弹性材料,与粘合剂不同,具有诸如环形快粘性、粘合性和内聚力的基本性能,并且用于多种行业如印刷、化学、医疗产品、家用电器、车辆、办公用品等中。
根据在PSA的制备中使用的单体,PSA可以分为丙烯酸类、橡胶类、硅类和EVA类PSA,并且根据其形式可以分为溶剂型、乳液型和热熔型。
过去,橡胶类PSA或溶剂型PSA已经主要用于胶带、粘合标签等。然而,随着对环境友好的PSA的需求增加,对非溶剂型PSA的兴趣在增加,因此,技术正在开发之中。目前,非溶剂型PSA的使用和生产显著增加,并且预期持续增加。
非溶剂型PSA通常通过水性乳液聚合制备,并且就经济效率和加工性能改善方面而言,需要具有低的聚集体产量和稳定地表现出优异的粘合性能。
在通过水性乳液聚合制备的这种水性PSA中,使用亲水性乳化剂。通常,使用具有亲水性和疏水性两者的两亲性单体分子作为亲水性乳化剂。特别地,使用包含具有高极性的亲水性基团的两亲性单体分子,如磺酸盐,用于水性体系中的粒子形成和保留稳定性。
同时,当乳化剂具有太多亲水性基团或亲水性过强时,存在对诸如聚乙烯、聚丙烯等的疏水性基材的粘合力弱的问题。此外,当应用于亲水性材料时,由于粘合力过强,在分离PSA时会留下残留物。
为了解决这些问题,已经提出在压敏粘合剂组合物中使用疏水性单体的方法或提高交联度的方法。然而,在这种情况下,也存在对亲水性基材的粘合力降低的问题。
因此,需要开发一种新型PSA,该PSA表现出对疏水性基材的增强的粘合力,同时保持对亲水性材料的粘合力而没有留下残留物。
发明内容
技术问题
本发明提供一种压敏粘合剂组合物及其制备方法,所述压敏粘合剂组合物表现出对亲水性和疏水性基材两者的优异的粘合力,而不在被粘物上留下残留物。
技术方案
本发明提供一种丙烯酸乳液压敏粘合剂组合物,包含共聚物,该共聚物通过在聚合物乳化剂的存在下使包含(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸类单体的单体混合物乳液聚合来制备,所述聚合物乳化剂由下面化学式1表示并且具有由下面等式1表示的75%至99%的水合度,并且数均分子量为1000g/mol至8000g/mol。
[化学式1]
Figure BDA0002589210940000021
[等式1]
水合度=m/(m+n)*100。
所述(甲基)丙烯酸酯类单体可以是选自(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸异丁酯、(甲基)丙烯酸叔丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸己酯、(甲基)丙烯酸庚酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸异癸酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸异冰片酯和(甲基)丙烯酸月桂酯中的一种或多种。
所述乙烯基类单体可以是选自包含具有1至5个碳原子的烷基的乙烯基酯类单体和芳香族乙烯基类单体中的一种或多种。
所述不饱和羧酸类单体可以是选自马来酸酐、富马酸、巴豆酸、衣康酸和(甲基)丙烯酸中的一种或多种。
另外,本发明提供一种所述丙烯酸乳液压敏粘合剂组合物的制备方法,该制备方法包括以下步骤:
制备预乳液,该预乳液包含:含有(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸类单体的单体混合物;交联剂;由化学式1表示并且具有由等式1表示的75%至99%的水合度,并且数均分子量为1000g/mol至8000g/mol的聚合物乳化剂;和
在引发剂的存在下使所述预乳液进行乳液聚合。
相对于100重量份的单体混合物,聚合物乳化剂的含量可以为0.1重量份至5.0重量份。
相对于100重量份的单体混合物,(甲基)丙烯酸酯类单体的含量可以为70重量份至99重量份。
相对于100重量份的(甲基)丙烯酸酯类单体,乙烯基类单体的含量可以为1重量份至25重量份。
相对于100重量份的(甲基)丙烯酸酯类单体,不饱和羧酸类单体的含量可以为0.1重量份至5重量份。
有益效果
根据本发明,提供一种压敏粘合剂组合物及其制备方法,所述压敏粘合剂组合物表现出对亲水性和疏水性基材两者的优异的粘合力,而不会在被粘物上留下残留物。
具体实施方案
在本发明中,术语“第一”、“第二”等用于描述不同的组分,并且这些术语仅用于将某种组分与其它组分区分开。
另外,本说明书中使用的术语仅用于说明示例性实施方案,而不意在限制本发明。除非在上下文中不同地表达,否则单数表达可以包括复数表达。必须理解的是,本说明书中的术语“包括”、“配备”或“具有”仅用于表示存在所述特性、数目、步骤、组分或它们的组合,并且不排除预先存在或加入一个或多个不同的特性、数目、步骤,组分或它们的组合的可能性。
本发明可以进行各种修改并且具有各种形式,并且在本说明书中说明了本发明的具体实例。然而,它们不意在将本发明限制于具体的实例,并且必须理解的是,本发明包括在本发明的精神和技术范围内包含的所有修改、等同物或替换物。
下文中,将更详细地描述本发明。
根据本发明的一个实施方案,提供一种丙烯酸乳液压敏粘合剂组合物,包含共聚物,该共聚物通过在聚合物乳化剂的存在下使包含(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸类单体的单体混合物乳液聚合来制备,所述聚合物乳化剂由下面化学式1表示并且具有由下面等式1表示的75%至99%的水合度,并且数均分子量为1000g/mol至8000g/mol。
[化学式1]
Figure BDA0002589210940000041
[等式1]
水合度=m/(m+n)*100
其中,在化学式1和等式1中,m和n表示构成聚合物的重复单元的摩尔数。
通常,作为在水性丙烯酸乳液压敏粘合剂组合物的制备中的乳化剂,使用包含具有高极性的亲水性基团的两亲性单体分子,如磺酸盐或硫酸盐。然而,包含通过使用上述乳化剂,即,胶乳粒子的乳液制备的共聚物的丙烯酸乳液压敏粘合剂组合物具有由于对亲水性基材的过强的粘合力而留下残留物的问题,并且相反地,具有表现出对疏水性基材如聚乙烯、聚丙烯等的低粘合力的问题。
因此,本发明人对表现出对亲水性和疏水性基材两者的优异的粘合力而不会在被粘物上留下残留物的压敏粘合剂组合物进行了研究,结果发现,当使用化学式1的聚合物乳化剂时,可以改善粘合性能,从而完成本发明。
所述聚合物乳化剂是通过使乙烯醇和甲基乙烯基酮单体共聚合而得到的改性聚乙烯醇类聚合物,并且可以是交替共聚物、无规共聚物和嵌段共聚物中的任意一种。在所述聚合物乳化剂中,作为亲水性基团的羟基起到保持水相中的粒子稳定性的作用,并且聚合物链部分可以充当在乳液聚合过程中发生聚合的空间。
优选地,所述聚合物乳化剂的水合度可以为75%至99%或78%至95%,水合度由下面等式1表示:
[等式1]
水合度=m/(m+n)*100
水合度是聚合物中来自乙烯醇的重复单元的百分比。水合度越高,聚合物的亲水性越强。如果水合度小于75%,则存在由于羧酸官能团过量而留下残留物的问题,如果水合度大于99%,则聚合物乳化剂会基本上对应于聚乙烯醇,由于它在水中的溶解度急剧下降而不适合用作乳化剂。因此,优选的是聚合物乳化剂满足上述水合度的范围。
优选地,所述聚合物乳化剂的数均分子量在1000g/mol至8000g/mol的范围内。如果聚合物乳化剂的数均分子量小于1000g/mol,则存在聚合物链的长度太短而不能充当乳化剂的问题。如果聚合乳化剂的数均分子量大于8000g/mol,则存在其在水中的溶解度低并且难以应用的问题。在这一方面,聚合物乳化剂的数均分子量可以通过在下面描述的实施例中说明的凝胶渗透色谱法(GPC)来确定。
同时,相对于总共100重量份的单体混合物,聚合物乳化剂的用量为0.1重量份至5重量份,或0.5重量份至3重量份。如果相对于100重量份的单体混合物,聚合物乳化剂的含量小于0.1重量份,则存在由于乳化剂缺乏,会难以发生通过形成胶束的常规乳液聚合并且会产生大的聚集体的问题。如果聚合物乳化剂的含量超过5重量份,则存在由于使用过量的乳化剂而引起粘合性能会降低的问题。
同时,在本发明的丙烯酸乳液压敏粘合剂组合物中,所述(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸单体可以混合然后用作单体。当使用三种单体时,本发明的丙烯酸乳液压敏粘合剂组合物可以具有改善整体粘合力和保持力的效果。
如本文所使用,术语“单体混合物”指聚合中使用的所有单体的混合物。对单体混合物没有特别地限制,只要它可以用于基于上述单体的丙烯酸乳液树脂的制备的乳液聚合反应中即可。例如,可以将混合状态的上述单体引入到聚合反应中,或者可以将上述单体顺序地引入到聚合反应中。
所述(甲基)丙烯酸酯类单体可以包括具有1至10个碳原子的直链烷基,具体地,选自(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸异丁酯、(甲基)丙烯酸叔丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸己酯、(甲基)丙烯酸庚酯、(甲基)丙烯酸酯辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸异癸酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸异冰片酯和(甲基)丙烯酸月桂酯中的一种或多种。
相对于100重量份的单体混合物,(甲基)丙烯酸酯类单体的含量可以为70重量份至99重量份。
所述乙烯基类单体可以是选自包含具有1至5个碳原子的烷基的乙烯基酯类单体和芳香族乙烯基类单体中的一种或多种。
具体地,所述乙烯基酯类单体可以包括在分子的一端包含乙烯基,并在分子的另一端包含具有1至5个碳原子的烷基的酯形式的单体。所述乙烯基酯类单体可以包括,例如,选自乙酸乙烯酯、丙酸乙烯酯、丁酸乙烯酯和戊酸乙烯酯中的一种或多种。
所述芳香族乙烯基类单体可以包括选自苯乙烯、甲基苯乙烯、丁基苯乙烯、氯苯乙烯、苯甲酸乙烯基酯、苯甲酸甲基乙烯基酯、乙烯基萘、氯甲基苯乙烯、羟甲基苯乙烯和二乙烯基苯中的一种或多种。
相对于100重量份的(甲基)丙烯酸酯类单体,乙烯基类单体的用量为1重量份至25重量份或5重量份至20重量份,因此,相对于100重量份的(甲基)丙烯酸酯类单体,在乳液聚合物中来自乙烯基类单体的重复单元的含量为约1重量份至25重量份或5重量份至20重量份。
如果使用过多量的乙烯基类单体,则由于反应速率差异,聚合物链的形成受阻,由此难以确保需要水平的粘合力,并且大量产生残留单体。相反,如果使用过少量的乙烯基类单体,则存在粘合力降低的问题。
所述不饱和羧酸类单体可以是选自马来酸酐、富马酸、巴豆酸、衣康酸和(甲基)丙烯酸中的一种或多种,但是不限于此。
相对于100重量份的(甲基)丙烯酸酯类单体,不饱和羧酸类单体的用量为0.1重量份至5重量份或0.5重量份至2重量份,因此,相对于100重量份的(甲基)丙烯酸酯类单体,在乳液聚合物中的来自不饱和羧酸类单体的重复单元的含量为约0.1重量份至5重量份或0.5重量份至2重量份。
如果使用过多量的不饱和羧酸类单体,则存在通过乳液聚合得到的共聚物粒子的粘度迅速增加,并且在粒子外部会形成过多的交联,从而引起胶凝的问题。相反,如果使用过少量的不饱和羧酸类单体,则存在得到的共聚物粒子的稳定性会降低的问题。
同时,根据本发明的一个实施方案,在乳液聚合时,除了所述单体混合物和所述乳化剂之外,还可以在不损害本发明的期望效果的范围内包含其它添加剂。例如,所述添加剂可以包括交联剂、聚合引发剂、缓冲剂、湿润剂、还原剂、链转移剂等中的一种或多种。
所述交联剂可以包括选自聚乙二醇二丙烯酸酯、聚丙二醇二丙烯酸酯、1,6-己二醇二丙烯酸酯、三羟甲基丙烷三丙烯酸酯、乙氧基化三羟甲基丙烷三丙烯酸酯、三丙二醇二丙烯酸酯、1,3-丁二醇二丙烯酸酯、季戊四醇三丙烯酸酯、3-三甲氧基甲硅烷基丙基甲基丙烯酸酯、乙烯基三甲氧基硅烷、二乙烯基苯、甲基丙烯酰胺、甲基丙烯酰胺乙基亚乙基脲、甲基丙烯酸酯亚乙基脲、烯丙基醚亚乙基脲和[N-(2-(2-氧代咪唑烷-1-基)乙基)(4-烯丙基醚)(3-羟基)丁胺]中的一种或多种。基于单体混合物,交联剂的用量可以为0重量%至1.5重量%。
所述聚合引发剂可以包括水溶性聚合引发剂,如铵或碱金属的过硫酸盐(例如,APS、过硫酸铵)、过氧化氢、过氧化物、氢过氧化物等,并且可以与一种或多种还原剂一起使用,以便在低温下进行乳液聚合反应,但是不限于此。在这一方面,基于单体混合物,聚合引发剂的用量可以为0.1重量%至2.0重量%。此外,聚合引发剂可以在上述范围内适当地分配,并且在单体混合物的聚合步骤中使用一次或多次。
所述缓冲剂可以包括碳酸氢钠、碳酸钠、磷酸钠、硫酸钠、氯化钠、氢氧化钠等,但是不限于此。此外,这些物质可以单独使用或以它们中的两种或更多种的混合物使用。缓冲剂可以起到调节聚合反应中的pH并且赋予聚合稳定性的作用。基于100重量%的单体混合物,缓冲剂的用量可以为0.1重量%至0.8重量%。
湿润剂充当乳化剂以降低表面张力用于涂布性,并且其含量可以在本领域公知的范围内使用。例如,润湿剂可以包括磺基琥珀酸二辛酯钠类(DOSS)化合物。基于100重量%的单体混合物,润湿剂的用量可以为0.1重量%至2重量%。
链转移剂用于将仅由一种类型的单体组成的聚合物即均聚物引入到胶束中,并且可以包括碳酸钠、甲基烯丙基磺酸钠、正十二烷基硫醇等,但是不限于此。基于100重量%的单体混合物,链转移剂的用量可以为0.01重量%至0.50重量%。
同时,根据本发明的另一实施方案,提供一种所述丙烯酸乳液压敏粘合剂组合物的制备方法,该制备方法包括以下步骤:
制备预乳液,该预乳液包含:含有(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸类单体的单体混合物;和由化学式1表示的聚合物乳化剂;和
在引发剂的存在下使所述预乳液进行乳液聚合。
本发明的上述丙烯酸乳液压敏粘合剂组合物可以具体通过以下方法制备,但是不限于此。
根据本发明的制备方法,可以首先通过将单体混合物与由化学式1表示的聚合物乳化剂以及水混合来制备预乳液。这样,可以在乳液聚合反应之前制备预乳液,从而减少聚集体的产生。
此时,在预乳液的制备中使用的(甲基)丙烯酸酯类单体、乙烯基类单体、不饱和羧酸类单体和由化学式1表示的聚合物乳化剂与上面描述的相同。此外,在预乳液的制备过程中,可以加入一种或多种上述其它添加剂,即,交联剂、缓冲剂、润湿剂、还原剂、链转移剂等。
接下来,可以经预定时间以相等的比例顺序引入预乳液和聚合引发剂,以进行预乳液的乳液聚合。
如上所述,所述聚合引发剂可以是水溶性聚合引发剂,如铵或碱金属的过硫酸盐(例如,APS、过硫酸铵)、过氧化氢、过氧化物、氢过氧化物等,并且可以与一种或多种还原剂一起使用,以便在低温下进行乳液聚合反应,但是不限于此。此时,基于单体混合物,聚合引发剂的用量可以为0.1重量%至2.0重量%。此外,聚合引发剂可以在上述范围内适当地分开,并且在单体混合物的聚合步骤中使用一次或多次。
顺序引入预乳液和聚合引发剂的时间可以为3小时至5小时。
所述乳液聚合可以在聚合引发剂的存在下在搅拌的同时在70℃至90℃的温度下进行3小时至8小时。具体地,乳液聚合可以在约75℃至约90℃的温度下进行约3小时至约6小时。考虑到压敏粘合剂的物理性能,聚合温度可以为约75℃至约85℃。
根据上述制备方法制备的本发明的丙烯酸乳液压敏粘合剂组合物可以表现出对亲水性和疏水性基材两者的优异的粘合性能,从而应用于压敏粘合剂片材。所述压敏粘合片材可以包括用于建筑的内部/外部材料、内部设计材料、广告膜或标签的压敏粘合膜或片,但是本发明不特别限于此。
下文中,将提供优选实施例用于更好地理解本发明。然而,提出下面的实施例仅用于更容易地理解本发明,并且本发明的内容不限于此。
[实施例]
实施例1
使用数均分子量(Mn)为1000g/mol且由下面等式1表示的水合度为99%的下面化学式1的改性聚乙烯醇乳化剂,通过以下方法制备丙烯酸乳液压敏粘合剂组合物。
[化学式1]
Figure BDA0002589210940000091
[等式1]
水合度=m/(m+n)*100
此时,数均分子量通过凝胶渗透色谱法(GPC)测量,具体地,通过使用PolymerLaboratories的PLGel MIX-B柱(长度为300mm)和Waters的PL-GPC220仪器评价。使用四氢呋喃作为溶剂,以1mL/分钟的流速进行测量。制备浓度为10mg/10mL的样品,然后以20μL的量应用。使用由聚苯乙烯标准品产生的校准曲线来得出Mw和Mn值。使用8种分子量(g/mol)为2000/10,000/30,000/70,000/200,000/700,000/2,000,000/4,000,000的聚苯乙烯标准品。
将138g的水加入到体积为3L的玻璃反应器中,并将温度升高至85℃并且保持在氮气气氛下。
单独地,为了制备预乳液,将由14g的改性聚乙烯醇乳化剂、6g的60重量%的磺基琥珀酸二辛酯钠水溶液、1.5g的氢氧化钠和176g的水组成的溶液加入到557g的丙烯酸2-乙基己酯、56g的甲基丙烯酸甲酯、57g的乙酸乙烯酯、14g的苯乙烯、14g的丙烯酸、14g的丙烯酸羟乙酯、1.5g的甲基丙烯酰胺乙基亚乙基脲或N-(2-(2-氧代咪唑烷-1-基)乙基)甲基丙烯酰胺(
Figure BDA0002589210940000101
WAMII)的混合物中,并且使用搅拌器混合以制备混浊的预乳液。
将3g的20重量%的过硫酸铵水溶液加入到包含水的玻璃反应器中,并且在搅拌下溶解5分钟。将预乳液和70g的3重量%的过硫酸铵水溶液分别经总共5小时和总共5.5小时顺序引入到玻璃反应器中,并将温度升高至85℃以进行乳液聚合反应。
在完全引入预乳液和过硫酸铵水溶液之后,将温度升高至85℃并且保持约1小时以使未反应的单体完成反应,然后冷却至室温,从而制备丙烯酸乳液树脂。
实施例2
除了使用数均分子量为1500g/mol且水合度为78%的改性聚乙烯醇乳化剂作为化学式1的乳化剂之外,以与实施例1中相同的方式制备丙烯酸乳液树脂。
实施例3
除了使用数均分子量为4000g/mol且水合度为85%的改性聚乙烯醇乳化剂作为化学式1的乳化剂之外,以与实施例1中相同的方式制备丙烯酸乳液树脂。
实施例4
除了使用数均分子量为6,000g/mol且水合度为78%的改性聚乙烯醇乳化剂作为化学式1的乳化剂之外,以与实施例1中相同的方式制备丙烯酸乳液树脂。
实施例5
除了使用数均分子量为7500g/mol且水合度为95%的改性聚乙烯醇乳化剂作为化学式1的乳化剂之外,以与实施例1中相同的方式制备丙烯酸乳液树脂。
比较例1
除了使用22g的30重量%的聚氧乙烯月桂基醚硫酸钠代替化学式1的乳化剂之外,以与实施例1中相同的方式制备丙烯酸乳液树脂。
实验例
制造压敏粘合剂片材
将在实施例1至实施例5以及比较例1和比较例2中制备的各个丙烯酸压敏粘合剂涂布到涂有有机硅的离型纸上,然后在120℃的烘箱中将其干燥约1分钟,形成厚度为约20μm的压敏粘合剂树脂涂层。将在有机硅离型纸上涂布的压敏粘合剂树脂与美术纸层压,以形成用于压敏粘合剂片材。将压敏粘合剂片材切割成25mm×200mm的尺寸,从而完成压敏粘合剂胶带试样的制造。
评价物理性能
1)环形快粘性试验
根据FINAT Test Method FTM-9对上面制造的各个试样进行测量。
制备尺寸为1英寸×20cm的试样之后,除去离型纸,将片材的两面折叠以形成环形,然后将两端固定。将该环立即附着于由HDPE制成的方形板状压敏粘合剂基材的表面上。当5秒后剥离时,在23℃和50%的湿度的测量环境下测量对应于最大力的力。在制备五个或更多个测量试样之后,测量环形快粘性并取平均值(单位:N/英寸)。
2)剥离强度试验
根据FINAT Test Method FTM-9对上面制造的各个压敏粘合剂片材进行测量。
制备尺寸为1英寸×20cm的试样之后,将由HDPE制成的方形板状压敏粘合剂基材的表面和附着表面以1英寸×1英寸或更大的尺寸彼此附着,并且通过2kg的辊往复运动压挤两次。20分钟之后以300mm/分钟的速度沿与附着表面为90°的方向剥离时,在23℃和50%的湿度的测量环境下测量对应于最大力的力。制备五个或更多个测量试样之后,测量力并取平均值。
3)残留率试验
将制造的压敏粘合剂片材附着于不锈钢(SUS)上,然后在60℃的温度和60RH%的相对湿度下老化24小时,然后在180度的方向上剥离以进行剥离强度试验。剥离之后,用肉眼观察残留粘合剂的面积与SUS的总整个面积的比例,以确定残留率。
通过上述方法测量的实施例和比较例的各个压敏粘合剂片材的环形快粘性、剥离强度和残留率示于下面表1中。
[表1]
Figure BDA0002589210940000121
参照表1,可以确认,与使用单体乳化剂的比较例1相比,本发明的丙烯酸乳液压敏粘合剂组合物通过使用具有化学式1的结构的聚合物乳化剂,具有显著低的残留率,同时表现出对疏水性基材的优异的粘合力和剥离强度。

Claims (6)

1.一种丙烯酸乳液压敏粘合剂组合物,包含共聚物,该共聚物通过在聚合物乳化剂的存在下使包含(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸类单体的单体混合物乳液聚合来制备,所述聚合物乳化剂由下面化学式1表示并且具有由下面等式1表示的75%至99%的水合度,并且数均分子量为1,000g/mol至8,000g/mol:
[化学式1]
Figure FDA0003424514860000011
[等式1]
水合度=m/(m+n)*100;
其中,在化学式1和等式1中,m和n表示构成所述聚合物乳化剂的重复单元的摩尔数,
其中,相对于100重量份的所述单体混合物,所述聚合物乳化剂的含量为0.1重量份至5.0重量份,
其中,相对于100重量份的所述(甲基)丙烯酸酯类单体,所述乙烯基类单体的含量为1重量份至25重量份,
其中,相对于100重量份的所述(甲基)丙烯酸酯类单体,所述不饱和羧酸类单体的含量为0.1重量份至5重量份。
2.根据权利要求1所述的丙烯酸乳液压敏粘合剂组合物,其中,所述(甲基)丙烯酸酯类单体是选自(甲基)丙烯酸甲酯、(甲基)丙烯酸乙酯、(甲基)丙烯酸丙酯、(甲基)丙烯酸异丙酯、(甲基)丙烯酸丁酯、(甲基)丙烯酸异丁酯、(甲基)丙烯酸叔丁酯、(甲基)丙烯酸戊酯、(甲基)丙烯酸己酯、(甲基)丙烯酸庚酯、(甲基)丙烯酸辛酯、(甲基)丙烯酸异辛酯、(甲基)丙烯酸2-乙基己酯、(甲基)丙烯酸癸酯、(甲基)丙烯酸异癸酯、(甲基)丙烯酸十二烷基酯、(甲基)丙烯酸异冰片酯和(甲基)丙烯酸月桂酯中的一种或多种。
3.根据权利要求1所述的丙烯酸乳液压敏粘合剂组合物,其中,所述乙烯基类单体是选自包含具有1至5个碳原子的烷基的乙烯基酯类单体;和芳香族乙烯基类单体中的一种或多种。
4.根据权利要求1所述的丙烯酸乳液压敏粘合剂组合物,其中,所述不饱和羧酸类单体是选自马来酸酐、富马酸、巴豆酸、衣康酸和(甲基)丙烯酸中的一种或多种。
5.一种丙烯酸乳液压敏粘合剂组合物的制备方法,该制备方法包括以下步骤:
制备预乳液,该预乳液包含:含有(甲基)丙烯酸酯类单体、乙烯基类单体和不饱和羧酸类单体的单体混合物;和聚合物乳化剂,该聚合物乳化剂由化学式1表示并且具有由等式1表示的75%至99%的水合度,并且数均分子量为1000g/mol至8000g/mol;以及
通过将所述预乳液与引发剂混合来进行乳液聚合:
[化学式1]
Figure FDA0003424514860000021
[等式1]
水合度=m/(m+n)*100,
其中,在化学式1和等式1中,m和n表示构成所述聚合物乳化剂的重复单元的摩尔数,
其中,相对于100重量份的所述单体混合物,所述聚合物乳化剂的含量为0.1重量份至5.0重量份,
其中,相对于100重量份的所述(甲基)丙烯酸酯类单体,所述乙烯基类单体的含量为1重量份至25重量份,
其中,相对于100重量份的所述(甲基)丙烯酸酯类单体,所述不饱和羧酸类单体的含量为0.1重量份至5重量份。
6.根据权利要求5所述的制备方法,其中,相对于100重量份的所述单体混合物,所述(甲基)丙烯酸酯类单体的含量为70重量份至99重量份。
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