CN111875500A - 一种含多环β-酮结构的光敏型光刻胶树脂单体及其合成方法 - Google Patents

一种含多环β-酮结构的光敏型光刻胶树脂单体及其合成方法 Download PDF

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CN111875500A
CN111875500A CN202010549411.1A CN202010549411A CN111875500A CN 111875500 A CN111875500 A CN 111875500A CN 202010549411 A CN202010549411 A CN 202010549411A CN 111875500 A CN111875500 A CN 111875500A
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傅志伟
贺宝元
邵严亮
潘新刚
薛富奎
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Xuzhou B&c Chemical Co ltd
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Abstract

本发明公开了一种含多环β‑酮结构的光敏型光刻胶树脂单体,涉及光刻胶树脂单体领域,其结构式如下所示:
Figure DDA0002541964360000011
其中R1为甲基或者H,R2、R3分别独立的为氢、烷基、环烷基,R4为烷基或者环烷基,且R2和R4、R3和R4或者R2和R3可以通过共价键连接形成环状结构;n为1‑10的整数,该树脂单体具有曝光前后溶解度差异大,能够降低粗糙度,提高灵敏度和分辨率,有利于形成均一性良好的光刻图案,耐刻蚀性能良好。

Description

一种含多环β-酮结构的光敏型光刻胶树脂单体及其合成方法
技术领域
本发明涉及光刻胶树脂单体领域,尤其涉及光敏型树脂单体及其合成方法。
背景技术
光刻技术是指利用光刻材料(特指光刻胶)在可见光、紫外线、电子束等作用下的化学敏感性,通过曝光、显影、刻蚀等工艺过程,将设计在掩膜版上的图形转移到衬底上的图形微细加工技术。
光刻材料(特指光刻胶),又称光致抗蚀剂,是光刻技术中涉及的最关键的功能性化学材料,主要成分是树脂、光酸产生剂、以及相应的添加剂和溶剂,这类材料具有光(包括可见光、紫外线、电子束等)化学敏感性,经光化学反应,本身在显影液中的溶解性发生变化。根据光化学反应机理不同,光刻胶分为正性光刻胶与负性光刻胶:曝光后,光刻胶在显影液中溶解性增加,得到与掩膜版相同图形的称为正性光刻胶;曝光后,光刻胶在显影液中溶解性降低甚至不溶,得到与掩膜版相反图形的称为负性光刻胶。
光敏树脂单体是光刻胶聚合树脂的重要组成部分,主要作用是曝光前后产生极性差,从而导致在极性显影剂中溶解度不同,本发明提供一种新型结构的光敏型光刻胶树脂单体。
发明内容
本发明要解决的技术问题是克服现有技术的缺陷,提供一种新型的含多环β-酮结构的光敏型光刻胶树脂单体及其合成方法。
为了解决上述技术问题,本发明提供了如下的技术方案:
本发明提供一种含多环β-酮结构的光敏型光刻胶树脂单体,其特征在于,所述光刻胶树脂单体的结构式为:,其中R1为甲基或者 H,R2、R3分别独立的为氢、烷基、环烷基,R4为烷基或者环烷基,且R2和R4、 R3和R4或者R2和R3可以通过共价键连接形成环状结构,n为1-10的整数。
作为本发明的一种优选技术方案,所述树脂单体的具体结构包括:
本发明还相应的提供一种含多环β-酮结构的光敏型光刻胶树脂单体的合成方法,所述树脂单体的合成路线如下:
其中X为卤素,具体步骤:
a.初始原料A中的双键被氧化剂氧化后形成三元环氧基团的中间体B;
b.中间体B酸性条件下三元环氧基团水解生成邻二羟基结构的中间体C;
c.中间体C在碱性条件下,与一当量的(甲基)丙烯酰氯酯化生成(甲基)丙烯酸酯结构的中间体D;
d.中间体D在碱性条件下与卤代物F反应生成树脂单体E。
作为本发明的一种优选技术方案,合成步骤a的氧化剂为间氯过氧苯甲酸或者过氧化氢。
作为本发明的一种优选技术方案,合成步骤b的酸为硫酸。
作为本发明的一种优选技术方案,合成步骤c和步骤d中碱性条件,所述碱均选择有机碱,包括三乙胺、二异丙基胺、吡啶。
作为本发明的一种优选技术方案,所述卤代物F的合成方法:
其中X为卤素,R4OH与R2COR3在卤化氢、硫酸钠作用下生成卤代物F,溶剂选择甲苯。
作为本发明的一种优选技术方案,所述初始原料A包括:和
与现有技术相比,本发明的有益效果如下:
本发明提供了一种新的光刻胶树脂单体,树脂单体含有光敏基团,与其它树脂单体聚合形成光刻胶树脂聚合物,在曝光后会脱去半缩醛(酮)保护基,半缩醛(酮)的活化能比较低,敏感性更高,脱保护后形成羟基结构,从而极性增大,溶解于碱性显影剂(一般为TMAH),该树脂单体具有曝光前后溶解度差异大,能够降低粗糙度,提高灵敏度和分辨率,有利于形成均一性良好的光刻图案,并且该树脂单体具有多环结构,更具耐刻蚀性能,酮结构增强了其亲水性,有利于提高碱溶性。
具体实施方式
以下结合实施例对本发明的优选实施例进行说明,应当理解,此处所描述的优选实施例仅用于说明和解释本发明,并不用于限定本发明。
实施例1
将螺[4.5]癸-2-烯-1,4-二酮A(50g,305mmol)加入到二氯甲烷(1.2L) 中,冰水浴冷却到0℃,加入间氯过氧苯甲酸(62g,359mmol),反应液升到室温搅拌反应16小时,过滤,滤液加入饱和碳酸氢钠溶液中和,水相用二氯甲烷(200mL×3)萃取,有机相用饱和食盐水清洗,分液,无水硫酸钠干燥后真空旋干得到油状化合物B(46.8g,260mmol,85.3%)。
将化合物B(46.8g,260mmol)加入到3M的硫酸(500mL)中,加热回流搅拌反应16小时,反应液冷却到5摄氏度,搅拌下加入碳酸钠粉末调节pH 到弱碱性,将溶剂旋干,固体加入THF(500mL)搅拌,过滤除去固体,溶剂旋干得到化合物C(39.5g,199mmol,76.7%)。
将化合物C(39.5g,199mmol)加入到二氯甲烷(1.2L),加入三乙胺(40g,395mmol),冰水冷却到0摄氏度,慢慢滴加丙烯酰氯(18.4g,203mmol),滴加结束后升到室温搅拌5小时,反应结束,加水(500mL)淬灭,水相用二氯甲烷(200mL×3)萃取,合并有机相,有机相用饱和食盐水洗涤,无水硫酸钠干燥,真空旋干得到化合物D(48.8g,193mmol,97.1%)
将化合物D(10g,40mmol)加入到乙腈(200mL)中,加入三乙胺(8g, 79mmol),冰水冷却到0℃,慢慢加入(1-氯乙基)-环己基醚(6.5g,40mmol) 的乙腈溶液(80mL),升到50℃搅拌反应12小时,冰水冷却下加入饱和碳酸氢钠溶液淬灭反应,浓缩除去乙腈,加入乙酸乙酯(200mL)和水(150mL),分液,水相用乙酸乙酯(100mL×3)萃取三次,合并有机相,有机相用饱和食盐水洗涤,无水硫酸钠干燥,真空旋干得到粗品,粗品蒸馏纯化得到树脂单体E-1(12.4g,33mmol,82.7%)。
实施例2
将化合物D(10g,40mmol)和3,4-二氢-2H-吡喃(3.4g,40mmol)加入到乙腈(100mL)中,加入甲磺酸(0.5g,5mmol),反应液室温下搅拌反应 16小时,加入饱和碳酸氢钠溶液淬灭反应,真空浓缩除去乙腈溶剂,加水 (100mL),水相用乙酸乙酯(100mL×3)萃取,合并有机相,有机相用饱和食盐水洗涤,无水硫酸钠干燥得到粗品,粗品蒸馏纯化得到树脂单体E-2 (12.6g,37mmol,94.5%)。
实施例3
将化合物D(10g,40mmol)加入到乙腈(200mL)中,加入三乙胺(8g, 79mmol),冰水冷却到0℃,慢慢加入1-氯-1-甲氧基-2-甲基丙烷(4.9g, 40mmol)的乙腈溶液(80mL),升到50℃搅拌反应12小时,冰水冷却下加入饱和碳酸氢钠溶液淬灭反应,浓缩除去乙腈,加入乙酸乙酯(200mL)和水 (150mL),分液,水相用乙酸乙酯(100mL×3)萃取三次,合并有机相,有机相用饱和食盐水洗涤,无水硫酸钠干燥,真空旋干得到粗品,粗品蒸馏纯化得到树脂单体E-3(11.5g,34mmol,85.7%)。
实施例4
将化合物D(10g,40mmol)加入到乙腈(200mL)中,加入三乙胺(8g, 79mmol),冰水冷却到0℃,慢慢加入1-氯甲氧基-2,2-二甲基丙烷(5.5g, 40mmol)的乙腈溶液(80mL),升到50℃搅拌反应12小时,冰水冷却下加入饱和碳酸氢钠溶液淬灭反应,浓缩除去乙腈,加入乙酸乙酯(200mL)和水 (150mL),分液,水相用乙酸乙酯(100mL×3)萃取三次,合并有机相,有机相用饱和食盐水洗涤,无水硫酸钠干燥,真空旋干得到粗品,粗品蒸馏纯化得到树脂单体E-4(11.6g,33mmol,83.0%)。
此外,提供一种简单合成含的原料的合成方法,以 (1-氯乙基)-环己基醚的合成为例:
将环己醇(10g,100mmol)和甲醛(4.5g,150mmol)加入到甲苯(100mL) 中,冷却到-20℃,通入氯化氢气体30分钟,再加入硫酸钠(21.3g,150mmol),反应液在0℃下搅拌16小时,过滤,滤液旋干得到(1-氯乙基)-环己基醚(13.5, 83mmol,83.1%)。
实施例3、实施例4的含原料可以按相同的方法合成,其它类似结构的原料,根据其本身的特性,也可以采取相同或者其它不同的方法。
与现有技术相比,本发明的有益效果如下:
本发明提供了一种新的光刻胶树脂单体,树脂单体含有光敏基团,与其它树脂单体聚合形成光刻胶树脂聚合物,在曝光后会脱去半缩醛(酮)保护基,半缩醛(酮)的活化能比较低,敏感性更高,脱保护后形成羟基结构,从而极性增大,溶解于碱性显影剂(一般为TMAH),该树脂单体具有曝光前后溶解度差异大,能够降低粗糙度,提高灵敏度和分辨率,有利于形成均一性良好的光刻图案,并且该树脂单体具有多环结构,更具耐刻蚀性能,酮结构增强了其亲水性,有利于提高碱溶性。
最后应说明的是:以上所述仅为本发明的优选实施例而已,并不用于限制本发明,尽管参照前述实施例对本发明进行了详细的说明,对于本领域的技术人员来说,其依然可以对前述各实施例所记载的技术方案进行修改,或者对其中部分技术特征进行等同替换。凡在本发明的精神和原则之内,所作的任何修改、等同替换、改进等,均应包含在本发明的保护范围之内。

Claims (8)

1.一种含多环β-酮结构的光敏型光刻胶树脂单体,其特征在于,所述光刻胶树脂单体的结构式为:
Figure FDA0002541964340000011
其中R1为甲基或者H,R2、R3分别独立的为氢、烷基、环烷基,R4为烷基或者环烷基,且R2和R4、R3和R4或者R2和R3可以通过共价键连接形成环状结构,n为1-10的整数。
2.根据权利要求1所述的一种含多环β-酮结构的光敏型光刻胶树脂单体,其特征在于,所述树脂单体的具体结构包括:
Figure FDA0002541964340000012
3.一种含多环β-酮结构的光敏型光刻胶树脂单体的合成方法,其特征在于,所述树脂单体的合成路线如下:
Figure FDA0002541964340000013
其中X为卤素,具体步骤:
a.初始原料A中的双键被氧化剂氧化后形成三元环氧基团的中间体B;
b.中间体B酸性条件下三元环氧基团水解生成邻二羟基结构的中间体C;
c.中间体C在碱性条件下,与一当量的(甲基)丙烯酰氯酯化生成(甲基)丙烯酸酯结构的中间体D;
d.中间体D在碱性条件下与卤代物F反应生成树脂单体E。
4.根据权利要求3所述的一种含多环β-酮结构的光敏型光刻胶树脂单体的合成方法,其特征在于,合成步骤a的氧化剂为间氯过氧苯甲酸或者过氧化氢。
5.根据权利要求3所述的一种含多环β-酮结构的光敏型光刻胶树脂单体的合成方法,其特征在于,合成步骤b的酸为硫酸。
6.根据权利要求3所述的一种含多环β-酮结构的光敏型光刻胶树脂单体的合成方法,其特征在于,合成步骤c和步骤d中碱性条件,所述碱均选择有机碱,包括三乙胺、二异丙基胺、吡啶。
7.根据权利要求3所述的一种含多环β-酮结构的光敏型光刻胶树脂单体的合成方法,其特征在于,所述卤代物F的合成方法:
Figure FDA0002541964340000021
其中X为卤素,R4OH与R2COR3在卤化氢、硫酸钠作用下生成卤代物F,溶剂选择甲苯。
8.根据权利要求3所述的一种含多环β-酮结构的光敏型光刻胶树脂单体,其特征在于,所述初始原料A包括:
Figure FDA0002541964340000022
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