Fluorenylaminoketone Photoinitiator for Deep UV Curing in Colored Inks
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing photoinitiators face issues such as poor compatibility with matrix resins, requiring large amounts of organic solvents, leading to health and environmental hazards, and limitations in curing speed, depth, and layer thickness, especially in colored systems, with concerns over odor, yellowing, and toxicity.
Innovation Solution
Development of a fluorenylaminoketone photoinitiator with improved solubility and reduced use of micromolecular active diluents, combined with a UV photocurable composition that includes specific unsaturated photopolymerizable compounds and additional photoinitiators, sensitizers, and additives.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional alpha-aminoalkylphenone photoinitiators are used, then high reactivity and excellent photoinitiator properties are achieved, but poor compatibility with matrix resins occurs and large amounts of organic solvent are required
Solution Approach 1:
The patent modifies the molecular structure of traditional photoinitiators by introducing fluorene groups and adjusting substituent positions, thereby changing solubility parameters and improving compatibility with matrix resins without requiring large amounts of organic solvent
Solution Approach 2:
The patent creates composite photoinitiator molecules combining fluorene structural units with aminoalkylphenone functional groups, achieving a synergistic effect that provides both improved solubility and maintained high reactivity
2Ease of operation
If organic solvent is added to improve solubility, then compatibility with matrix resins is enhanced, but health hazards and environmental pollution increase
Solution Approach 1:
The patent extracts the solubility-enhancing functionality from external organic solvents and incorporates it directly into the photoinitiator molecular structure through fluorene groups, eliminating the need for harmful solvent additives
3Ease of operation
If solvent is added to the system, then solubility is improved, but ink diffusion increases and pattern clarity decreases
Solution Approach 1:
The patent replaces long-lived organic solvents that cause continuous diffusion with a molecularly integrated solubility solution, providing stable solubility enhancement without ongoing diffusion effects that would compromise pattern precision
4Reliability
If traditional photoinitiators are used in colored systems, then photoinitiator activity is maintained, but curing speed decreases and deep part curing becomes difficult
Solution Approach 1:
The patent introduces fluorene groups with extended conjugation at specific positions on the photoinitiator molecule, creating local regions of enhanced electron delocalization that improve light absorption and energy transfer efficiency, thereby increasing curing speed and deep part penetration
5Ease of operation
If Irgacure 907 photoinitiator is used, then liquid curability is achieved, but bad odor and serious yellowing occur after light irradiation
Solution Approach 1:
The patent replaces the problematic methylthio group in Irgacure 907 with fluorene-based structures that eliminate odor and yellowing issues while maintaining liquid curability, effectively converting a harmful structural feature into a beneficial alternative
6Object-generated harmful factors
If biphenyl derivative photoinitiator is used as substitute, then yellowing resistance is improved, but solubility decreases and sublimation occurs
Solution Approach 1:
The patent merges the yellowing-resistant fluorene structural motif with solubility-enhancing aminoalkylphenone functional groups in a single integrated molecule, achieving both yellowing resistance and improved solubility simultaneously rather than as separate competing properties
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 fluorenylaminoketone photoinitiator enhances solubility, reduces solvent use, and provides high sensitivity, deep curing, and excellent yellowing resistance, promoting the application of photocurable compositions in various fields.
Implementation Method 1
a UV photocurable composition containing a fluorenylaminoketone photoinitiator... an olefinically unsaturated photopolymerizable compound and a photoinitiator
Implementation Method 2
exhibits excellent photoinitiator properties... after decomposition by light irradiation
Data Source
AI summary
Disclosed are a fluorenylaminoketone photoinitiator, a preparation method thereof, and a UV photocurable composition containing same. The photoinitiator comprises a compound having a structure as shown in general formula (I) or a derivative compound thereof. The fluorenylaminoketone photoinitiator provided in the present invention may effectively improve the solubility of traditional photoinitiators and reduce the use of micromolecular active diluents, and also has high sensitivity and good effect of deep-layer curing. It has very good promotion effect on popularization and application of photocurable compositions, particularly colored ink systems, in the field of photocuring. The UV photocurable composition containing a fluorenylaminoketone photoinitiator of the present invention has advantages of high sensitivity, no residue after development, good pattern integrity, and no or little odor of coating layers after curing, as well as excellent yellowing resistance.