Photocurable Composition with Phosphite and Aldehyde for Oxygen-Resistant Curing
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Solution Overview
Problem
Current photocuring processes face inefficiencies due to oxygen inhibition, limited light absorption in pigmented systems, compatibility issues with binder systems, storage instability, and the need for inert environments, which hinder the development of high-performance photoinitiators for applications like color filter resists and coatings.
Innovation Solution
A photocurable composition comprising a photoinitiator, organic phosphite, and aldehyde that generates free radicals under low energy lamps, allowing for rapid curing in the presence of oxygen and inert environments, with the combination of organic phosphite and aldehyde enhancing performance and reducing unpleasant odors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If conventional photoinitiators are used for photocuring, then curing can be achieved, but curing rate is slow and oxygen inhibition occurs
Solution Approach 1:
The patent combines multiple photoinitiator compounds (Type I and Type II photoinitiators) into a composite photoinitiating system. This composite approach allows simultaneous generation of free radicals through different mechanisms (direct cleavage and hydrogen abstraction), achieving rapid curing while maintaining effectiveness in the presence of oxygen. The synergistic combination of photoinitiators resolves the contradiction between fast curing rate and oxygen resistance.
Solution Approach 2:
The patent modifies the photoinitiating system by selecting specific photoinitiator compounds with appropriate absorption characteristics and reactivity parameters. By changing the chemical composition and concentration ratios of photoinitiators, the system achieves both rapid curing kinetics and resistance to oxygen inhibition, resolving the contradiction between curing speed and curing completeness.
2Productivity
If photoinitiators are used in pigmented systems, then curing can occur, but light absorption is limited reducing curing efficiency
Solution Approach 1:
The patent employs photoinitiator compounds that possess broad-spectrum light absorption capabilities, enabling them to function effectively across different wavelength ranges. This multi-functional photoinitiating system can absorb various types of actinic radiation (UV, visible light) and still generate sufficient free radicals for efficient curing in pigmented systems, resolving the contradiction between curing efficiency and light absorption limitations.
3Ease of operation
If conventional photocuring methods are used, then curing is achieved, but inert environments are required which increases process complexity
Solution Approach 1:
The patent converts the previously harmful effect of oxygen (which caused inhibition) into a non-inhibitory condition by using a photoinitiating system that generates radicals fast enough to outcompete oxygen consumption. This allows curing to proceed in ambient air without requiring inert atmospheres, dramatically simplifying the process and eliminating the need for complex environmental control equipment.
4Productivity
If photoinitiators are used for rapid curing, then curing rate increases, but storage stability decreases
Solution Approach 1:
The patent selects photoinitiator compounds with appropriate stability parameters that allow them to remain dormant during storage but become highly active upon light irradiation. By carefully choosing photoinitiators with stable molecular structures that resist premature decomposition, the system maintains storage stability while still achieving rapid curing rates when activated by light.
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 composition achieves significantly faster curing times, up to 200 times faster than prior art, while maintaining stability and solubility, and can be used in various industrial applications, including pigmented systems, without the need for inert environments.
Implementation Method 1
Photochemically induced polymerization reactions have become of great importance in industry, in particular for rapid curing of thin films
Implementation Method 2
The primary function of a photoinitiator is to generate free radicals when the photoinitiator is irradiated with light of appropriate energy or wavelength
Implementation Method 3
A photocurable composition comprising a photoinitiator, organic phosphite, and aldehyde that generates free radicals under low energy lamps
Data Source
AI summary
The photocuring efficiency of a photoinitiator is increased by mixing it with an organic phosphite and an aldehyde. This mixture or photoinitiator composition can be used to cure acrylates or other photocurable compounds, particularly in an oxygen-containing environment, and the photocurable compositions can be used to form various articles.