Acylphosphine Oxide Photoinitiator with Acid-Stable Silicone Compatibility
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Solution Overview
Problem
Existing photoinitiators for organopolysiloxane curing systems suffer from poor compatibility, leading to separation during storage and resulting in severe haze of the cure product, and are susceptible to acid cleavage of the silyl ether bond, rendering them incompatible with the silicone matrix.
Innovation Solution
A compound represented by Formula I, which is prepared through specific reaction steps and reacted with hydrosilane in the presence of a platinum-containing catalyst, forming a photoinitiator compatible with organopolysiloxane, maintaining stability and solubility.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Stability of the object's composition
If photoinitiators with silyl ether bonds are used to improve solubility in organopolysiloxane, then compatibility with silicone matrix is improved, but susceptibility to acid cleavage increases
Solution Approach 1:
The patent removes the problematic silyl ether bond (CH2-OSi) from the photoinitiator structure entirely. Instead, it uses a carbon-carbon bond connecting the photoinitiator to the silicone matrix, which is chemically stable and resistant to acid cleavage while maintaining compatibility and solubility in the organopolysiloxane system.
Solution Approach 2:
The patent creates a composite structure where the photoinitiator is integrated into the silicone matrix through a stable carbon-carbon bond, forming a hybrid system that combines the photoinitiating functionality with the stability and compatibility of the silicone polymer chain.
2Ease of operation
If conventional photoinitiators are used, then photoinitiation function is provided, but separation from silicone matrix occurs during storage
Solution Approach 1:
The patent merges the photoinitiator molecule with the silicone matrix through a stable carbon-carbon bond, creating a unified structure that prevents phase separation. The photoinitiator is no longer a separate additive but an integrated component of the silicone polymer system, maintaining homogeneity during storage.
3Stability of the object's composition
If silyl ether bonded photoinitiators are used, then solubility problem is addressed, but compatibility with silicone matrix is compromised due to acid cleavage
Solution Approach 1:
The patent converts the harmful effect of acid cleavage on silyl ether bonds into a beneficial design decision by eliminating the silyl ether bond entirely. The carbon-carbon bond used instead is inherently resistant to acid cleavage, transforming the vulnerability into a strength of the new molecular architecture.
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 resulting photoinitiator is compatible with organopolysiloxane, forming a homogeneous, cloud-free composition that maintains stability and clarity, addressing the issues of separation and acid cleavage.
Implementation Method 1
contacting under reactive conditions and in the presence of a platinum-containing catalyst the compound of Formula I with a hydrosilane
Data Source
AI summary
The present invention is a compound of Formula I: where R1-R3, m, and n, are defined herein. The compound of the present invention is useful as an intermediate for photoinitiator that is soluble in an ethylenically unsaturated organopolysiloxane.