Photocurable Composition for Low-Odor, Non-Yellowing Surface Curing
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Solution Overview
Problem
Current photoinitiators used in photosensitive curing technologies pose environmental and health risks due to benzene amine-like compounds, causing pollution, toxicity, and limited wavelength absorption, which affects curing efficiency and product quality.
Innovation Solution
A photosensitive composition comprising a photoinitiator compound with structure (I) and ethylenic unsaturated double bonds, along with optional co-initiators, that does not contain benzene amine-like structures, reducing viscosity and odor, and improving curing performance across various light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If traditional photoinitiators (ketones, benzoyl compounds, phosphates) are used, then curing efficiency is achieved, but environmental pollution and health risks increase due to VOC release and toxicity
Solution Approach 1:
The patent changes the chemical structure parameters of photoinitiators by introducing cyclic carboxylate esters and heterocyclic compounds with specific functional groups (structures I-V), replacing traditional ketone and benzoyl compounds. This structural parameter change maintains photopolymerization initiation capability while eliminating harmful VOC release and reducing toxicity, thus resolving the contradiction between curing efficiency and environmental safety
Solution Approach 2:
The patent employs composite photoinitiator systems combining multiple cyclic carboxylate ester and heterocyclic compounds in specific ratios. This composite approach synergistically maintains high curing efficiency across different wavelength ranges while distributing and reducing the environmental burden of individual compounds, addressing both productivity and harmful factors
2Productivity
If benzoyl initiators are used, then curing reaction is initiated, but yellowing of product surface occurs affecting appearance quality
Solution Approach 1:
The patent modifies the chemical structure parameters by replacing benzoyl groups with cyclic carboxylate ester and heterocyclic structures that have inherent resistance to photodegradation and oxidation. This structural change eliminates the yellowing mechanism while preserving the photoinitiation function, thereby maintaining both curing productivity and appearance quality
3Adaptability or versatility
If photoinitiators with broad wavelength absorption are used, then curing versatility is improved, but composition complexity increases
Solution Approach 1:
The patent designs photoinitiator molecules with multiple chromophoric groups (structures I-V) that can absorb across different wavelength ranges (UV and visible light). This multi-functional molecular design allows a single photoinitiator composition to work with various light sources (mercury lamps, LED, xenon lamps), achieving versatility without increasing compositional complexity
Solution Approach 2:
The patent creates composite photoinitiator systems combining compounds with complementary absorption spectra. This composite strategy achieves broad wavelength coverage through synergistic combination rather than using individually complex molecules, thus improving versatility while controlling composition complexity
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 effective surface curing without yellowing, reduces environmental pollution risks, and enhances processability, making it suitable for industries with high odor and quality standards.
Implementation Method 1
triggers the polymerization reaction in the material through the irradiation of specific wavelengths of light on the photoinitiator
Implementation Method 2
the ultraviolet absorption range of 379 initiator is relatively narrow, mainly concentrated around 365 nm
Data Source
AI summary
The present invention generally relates to a photosensitive material. More particularly it relates to a photosensitive composition comprising a photoinitiator compound having a structure (I) and at least one monomer/oligomer wherein the monomer/oligomer is having photopolymerizable ethylenic unsaturated double bonds and its application in the field of photosensitive curing.