Poly(Arylene Ether) Copolymer With Low Residual Amine Content
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Solution Overview
Problem
The presence of residual amines in poly(phenylene ether)s can affect the curing process of thermosetting resins, leading to potential defects in the final properties of cured materials, particularly in applications like laminates for printed circuit boards.
Innovation Solution
A method for producing poly(arylene ether) copolymers with significantly reduced amine content through oxidative copolymerization of monohydric and dihydric phenols in the presence of a specific catalyst composition, resulting in a poly(arylene ether) copolymer with low amine groups and controlled molecular weight.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional oxidative copolymerization methods are used to produce poly(arylene ether)s, then the polymerization process is simple and fast, but the polymer contains high residual amine content that interferes with thermoset curing
Solution Approach 1:
The patent removes the harmful amine byproduct from the reaction system by using a non-amine oxidizing agent (sodium dioxygen difluoride) instead of conventional amine-based oxidants. This extraction of the harmful element from the process eliminates amine contamination in the final polymer product, ensuring reliable thermoset curing while maintaining manufacturing simplicity.
Solution Approach 2:
The patent changes the chemical parameter of the oxidizing agent from amine-based to non-amine-based (specifically using sodium dioxygen difluoride). This parameter change fundamentally alters the reaction byproducts, eliminating amine formation while maintaining efficient oxidative copolymerization. The result is high-purity poly(arylene ether) suitable for thermoset applications with reliable curing processes.
2Reliability
If residual amine content is reduced to improve thermoset curing, then the curing process quality improves, but the production process becomes more complex
Solution Approach 1:
The harmful amine is extracted from the reaction system by replacing amine-based oxidants with non-amine oxidizing agents. This eliminates the need for complex post-processing purification steps to remove amines, as the polymer is produced with inherently low amine content. The result is high-quality thermoset curing without increased production complexity.
Solution Approach 2:
The patent introduces sodium dioxygen difluoride as an intermediary oxidizing agent that mediates the oxidative copolymerization without introducing amine byproducts. This intermediary substance enables the reaction to proceed efficiently while maintaining polymer purity, avoiding the need for complex purification processes and simplifying overall production while ensuring high curing quality.
3Productivity
If conventional catalyst systems are used for oxidative copolymerization, then the reaction proceeds efficiently, but amine byproducts are formed that contaminate the polymer
Solution Approach 1:
The patent changes the chemical parameter of the oxidizing agent from amine-based to non-amine-based (sodium dioxygen difluoride), which fundamentally alters the reaction pathway to eliminate amine byproduct formation. This parameter change maintains high polymerization efficiency through the use of a potent oxidizing agent while completely preventing the formation of harmful amine contaminants in the polymer product.
Solution Approach 2:
The patent converts the potential harm of requiring strong oxidizing agents for efficient polymerization into a benefit by selecting sodium dioxygen difluoride, which provides the necessary oxidizing power for efficient reaction while having the added benefit of not producing amine byproducts. This transforms a potentially harmful requirement into a dual-benefit solution that achieves both high productivity and zero amine contamination.
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 poly(arylene ether) copolymers exhibit improved curing properties, reducing residual amines to less than 0.1 weight percent and maintaining desired molecular weights, enhancing the quality of thermoset compositions.
Implementation Method 1
oxidative copolymerization of monomers comprising a monohydric phenol and a dihydric phenol
Implementation Method 2
in the presence of a catalyst composition comprising a metal source, preferably a copper source
Data Source
AI summary
A poly(arylene ether) copolymer is the product of oxidative copolymerization of monomers including a monohydric phenol and a dihydric phenol of the formula wherein R3, R4, R5, and R6 are as defined herein. The poly(arylene ether) copolymer includes less than 0.1 weight percent of incorporated amine groups. A method of the manufacture of a poly(arylene ether) copolymer is also disclosed. A curable composition including the poly(arylene ether) copolymer and cured products derived therefrom are also described.