Dual Curing Composition for Electro-Optical Components
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Solution Overview
Problem
Existing compositions that can be cross-linked by actinic radiation or moisture are either too slow in curing, especially in shadow zones, or not suitable for rapid, automated production processes, particularly in the production of electro-optical components.
Innovation Solution
A single-component dual curing composition that is liquid at room temperature, containing alpha-(alkoxy)silane compounds, photoinitiators, and radiation-curing compounds, which can be rapidly cross-linked by both actinic radiation and moisture, ensuring complete curing throughout the volume.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If radiation-curing compositions are used to achieve rapid curing, then curing speed is improved, but shadow zones remain uncured
Solution Approach 1:
The patent combines two different curing mechanisms - radiation curing (photopolymerization) and moisture curing (silane crosslinking) - into a single dual-curing composition. This allows the material to be cured by radiation in accessible areas while simultaneously being cured by moisture penetration in shadow zones, ensuring complete curing throughout the entire volume.
Solution Approach 2:
The composition uses a composite system containing both photoinitiators for radiation curing and alpha-alkoxysilane compounds for moisture curing. This composite approach integrates two distinct chemical systems that operate through different mechanisms, allowing the material to overcome the limitations of each individual curing method.
2Reliability
If moisture-curing compositions are used to ensure complete curing, then curing completeness is improved, but curing speed becomes too slow for automated production
Solution Approach 1:
The patent merges moisture curing with radiation curing to create a dual-curing system. The radiation curing component provides rapid initial setting (within seconds to minutes) suitable for automated production, while the moisture curing component ensures complete curing throughout the entire material volume including shadow zones.
Solution Approach 2:
The radiation curing acts as a preliminary action that rapidly cures the accessible portions of the material first, providing immediate structural integrity. The moisture curing then completes the process in shadow zones, ensuring full curing throughout the entire volume.
3Reliability
If polyolefins with alpha-alkoxysilane groups are used for moisture curing, then moisture curing capability is improved, but storage stability deteriorates due to low tolerance to formulation components
Solution Approach 1:
The patent changes the chemical parameters of the silane compound by selecting specific alpha-alkoxysilane compounds with controlled reactivity. These compounds have been optimized to balance moisture curing capability with storage stability, showing sufficient tolerance to the formulation components including photoinitiators and other additives.
Solution Approach 2:
The patent applies different functional characteristics to different components: the alpha-alkoxysilane compounds provide moisture curing capability while the photoinitiators provide radiation curing capability. Each component is selected with specific local qualities that optimize its performance while maintaining compatibility with other formulation components.
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 rapid curing with high initial hardness, making it suitable for automated production processes, including applications in electro-optical components, where it can cure in shadow zones exposed to moisture, ensuring stability and efficiency.
Implementation Method 1
The photoinitiator is broken down by the radiation, for example by visible or UV light, into reactive radicals with which the polymerization or cross-linking of the monomers is initiated.
Implementation Method 2
at least one compound comprising one to four alpha-(alkoxy)silane groups
Data Source
AI summary
The invention relates to combined radiation- and moisture-curing compounds, which are characterized in particular by rapid curing by means of moisture. The compounds can be used as adhesives, coatings or potting materials. The use of the compounds according to the invention is particularly preferred for filling electro-optical components.