| abstract |
The present invention provides a fluorene initiator, a photocurable composition comprising same, and an application thereof. The fluorene photoinitiator has a structure represented by formula (I) or formula (II). In the photoinitiator, one or more alkyl ketone substituents are introduced to a fluorene structure, and two aryl ketone-based alkyl substituents or benzophenone-based alkyl substituents are introduced to no. 9 carbon atom, thereby enabling fragments formed by the initiator after an initiation reaction to still have high stability and photocuring effect; in addition, the introduction of a plurality of photoactive groups R3 can increase the number of free radicals produced by the photoinitiator per unit mass, thereby facilitating the improvement of sensitivity of the photoinitiator. Moreover, because the photoinitiator has a larger molecular weight and a lighter color, the photoinitiator further has the characteristics of less liability to migration and excellent yellow resistance, and therefore, the photoinitiator has the advantages of almost no VOC emission, low odor and excellent yellow resistance. |