Phenylene Ether Oligomer Solvent Replacement for Particle Precipitation

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Solution Overview

Problem

The production of phenylene ether oligomers is hindered by their poor solubility in solvents and compatibility with other resins, limiting their industrial applications due to difficulties in precipitating them as particles, especially when using methods that involve aromatic hydrocarbon solutions and alcohols.

Innovation Solution

A process involving the oxidative polymerization of bivalent and monovalent phenol compounds in an aromatic hydrocarbon solvent, followed by replacing the solvent with a water-soluble organic solvent and contacting the solution with water to precipitate the phenylene ether oligomer as particles, allowing for the recovery and reuse of solvents.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Quantity of substance

If a phenylene ether oligomer is obtained by oxidative polymerization in an aromatic hydrocarbon solvent, then the oligomer shows excellent solubility in the solvent, but it becomes difficult to precipitate the oligomer as particles

Engineering Contradiction:

Improvesolubility of phenylene ether oligomerVSAvoidease of precipitation as particles

Core Design Contradiction:

Quantity of substanceVSEase of manufacture

Solution Approach 1:

The patent changes the solvent parameter from aromatic hydrocarbon to water-soluble organic solvent (such as dimethylformamide, dimethylacetamide, or N-methylpyrrolidone). This parameter change maintains the oligomer's solubility during polymerization but enables subsequent precipitation when water is added, as the oligomer becomes insoluble in the aqueous environment.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent uses a water-soluble organic solvent as an intermediary substance. This solvent acts as a bridge: it dissolves the phenylene ether oligomer during synthesis like the original aromatic hydrocarbon, but unlike aromatic hydrocarbons, it can be mixed with water to create a precipitation environment. The intermediary solvent thus enables both good solubility during reaction and easy precipitation afterward.

Inventive Principle:

Principle #24Intermediary (Mediator)

2Productivity

If water is added to decrease solubility in alcohol to precipitate particles, then precipitation efficiency improves, but a viscous substance precipitates instead of particles

Engineering Contradiction:

Improveprecipitation efficiencyVSAvoidshape of precipitate

Core Design Contradiction:

ProductivityVSShape

Solution Approach 1:

The patent changes the solvent system parameter by using water-soluble organic solvents with specific properties (high boiling point, good solubility for the oligomer) instead of alcohols. When water is added to this modified solvent system, the oligomer precipitates as discrete particles rather than viscous substances, maintaining both high precipitation efficiency and proper particle morphology.

Inventive Principle:

Principle #35Parameter changes

3Adaptability or versatility

If phenylene ether oligomer is produced with high solubility in general-purpose solvents, then compatibility with other resins improves, but difficulty in precipitating as particles increases

Engineering Contradiction:

Improvecompatibility with other resinsVSAvoidease of precipitation as particles

Core Design Contradiction:

Adaptability or versatilityVSEase of manufacture

Solution Approach 1:

The patent changes the solvent parameter to water-soluble organic solvents, which enables the phenylene ether oligomer to achieve high solubility in general-purpose solvents (improving compatibility with other resins) while simultaneously enabling easy precipitation as particles when water is added. This parameter change resolves the contradiction by providing a dual-benefit solvent system.

Inventive Principle:

Principle #35Parameter changes

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

This method enhances the solubility and compatibility of phenylene ether oligomers with other resins, enabling efficient precipitation as particles and facilitating their industrial production while allowing for solvent recovery, thus expanding their application in electronic and constructional materials.

Implementation Method 1

when the resultant phenylene ether oligomer solution is brought into contact with water, it is possible to precipitate the phenylene ether oligomer as particles

Methodology Applied

Scientific EffectSolubility difference: Precipitation

Implementation Method 2

when an organic hydrocarbon solvent of an aromatic hydrocarbon solvent solution of a phenylene ether oligomer is replaced with a water-soluble organic solvent having a boiling point higher than the boiling point of the above organic hydrocarbon solvent

Methodology Applied

Scientific EffectSolvent replacement: Distillation

Data Source

PatentUS7838618B2Process for the production of phenylene ether oligomer

Publication Date: 2010.11.23 MITSUBISHI GAS CHEM CO INC

AI summary

A process for producing a phenylene ether oligomer comprising oxidative polymerization of a specific bivalent phenol compound and a specific monovalent phenol compound in an aromatic hydrocarbon solvent, wherein the aromatic hydrocarbon solvent of a phenylene ether oligomer solution obtained after the termination of the polymerization is replaced with a water-soluble organic solvent having a boiling point higher than that of the aromatic hydrocarbon solvent and the resultant phenylene ether oligomer solution is brought into contact with water, thereby precipitating the phenylene ether oligomer as particles.