Fluorene-Based Photopolymerization Initiator for High Sensitivity
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional photopolymerization initiators, such as those with a carbazole skeleton, have limitations in sensitivity to active energy rays and solubility, necessitating the development of a compound with improved characteristics for various applications.
Innovation Solution
A novel fluorene-based compound with specific substitutions at the 2- and 7-positions, which serves as a photopolymerization initiator, enhancing sensitivity and solubility when incorporated into a photosensitive composition.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photopolymerization initiators with carbazole skeleton are used, then sensitivity to active energy ray is achieved, but solubility is insufficient
Solution Approach 1:
The invention changes the chemical structure parameters by replacing the carbazole skeleton with a fluorene skeleton and introducing specific substituents (oxime ester groups at positions 2 and 7, and alkyl groups at position 9) to simultaneously achieve high sensitivity and improved solubility
Solution Approach 2:
The invention creates a composite molecular structure combining fluorene core with oxime ester functional groups and alkyl substituents, achieving synergistic effects that improve both sensitivity and solubility properties
2Reliability
If photopolymerization initiator with high sensitivity is developed, then sensitivity to active energy ray is improved, but performance for various applications may be compromised
Solution Approach 1:
The fluorene-based compound is designed to perform multiple functions: it acts as a photopolymerization initiator with high sensitivity, provides good solubility in various solvents, and maintains stability across different application conditions, making it universally applicable
3Reliability
If new fluorene-based compound is synthesized, then sensitivity and solubility are improved, but synthesis complexity increases
Solution Approach 1:
The synthesis is divided into distinct segments: first forming the fluorene core with alkyl groups, then introducing oxime ester groups at specific positions, allowing for systematic and manageable synthesis steps
Solution Approach 2:
The invention introduces functional groups at specific local positions (oxime ester at positions 2 and 7, alkyl at position 9) to achieve desired properties without complicating the entire molecular structure
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The fluorene-based compound exhibits high sensitivity to active energy rays and improved solubility, making it suitable for diverse applications beyond conventional initiators.
Implementation Method 1
a photosensitive composition containing a compound having an ethylenically unsaturated bond and a photopolymerization initiator can be cured by being irradiated with an active energy ray
Data Source
Figure 1(A)~1(B)
Figure 2
Figure 3
AI summary
According to an embodiment of the present invention, there is provided a novel fluorene-based compound and a photopolymerization initiator using the fluorene-based compound. The fluorene-based compound according to an embodiment of the present invention is represented by the general formula (1). A photopolymerization initiator having additionally high sensitivity can be provided by using the fluorene-based compound. In addition, a photopolymerization initiator that can impart additionally excellent characteristics can be provided by appropriately selecting, for example, a substituent.