关于乙醛酸酯部分作为可见光光引发剂的光可裂解官能团的研究,特别是在自由基光聚合的引发方面仍然有限。本研究介绍了九种创新的基于咔唑的乙醛酸乙酯衍生物(CEG),它们被合成并被发现作为单组分光引发系统表现出优异的光引发能力。值得注意的是,这些结构在近紫外/可见光范围内表现出强大的吸收能力,超过了商业光引发剂。此外,与自由基光聚合中的基准光引发剂(MBF)相比,新开发的乙醛酸酯衍生物表现出更高的丙烯酸酯官能团转化率。通过脱羧反应和电子自旋共振自旋捕获的综合分析,阐明了CEGs的光引发机制。此外,它们的实用性在直接激光写入和 3D 打印过程中得到了证实,从而能够成功制造 3D 打印物体。这项研究介绍了新型光引发剂分子设计中的开创性概念和有效策略,展示了它们在 3D 打印中高度有利的应用潜力。
A radiation curable composition for UV LED curing includes at least one co-initiator selected from the group consisting of an aliphatic tertiary amine and a dialkyl aniline derivative; and at least one specific carbazole photoinitiator. The radiation curable composition can be advantageously used to prevent unstable yellowing behaviour in an image upon storage.
PHOTOINITIATORS FOR UV-LED CURABLE COMPOSITIONS AND INKS
申请人:Loccufier Johan
公开号:US20120309861A1
公开(公告)日:2012-12-06
A specific type of carbazole photoinitiator is capable of providing radiation curable compositions that are curable by UV LEDs and do not exhibit an unstable yellowing behaviour in an image upon storage like ITX.
[EN] PHOTOINITIATORS FOR UV-LED CURABLE COMPOSITIONS AND INKS<br/>[FR] PHOTOINITIATEURS POUR COMPOSITIONS DURCISSABLES PAR DEL UV ET ENCRES
申请人:AGFA GEVAERT
公开号:WO2011069947A1
公开(公告)日:2011-06-16
A specific type of carbazole photoinitiator is capable of providing radiation curable compositions that are curable by UV LEDs and do not exhibit an unstable yellowing behaviour in an image upon storage like ITX.