Curable Resin Composition for Fast Curing and Storage Stability

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Solution Overview

Problem

The challenge lies in achieving a curable resin composition with 2-methylene-1,3-dicarbonyl compounds that balances excellent curing rates with high storage stability, as impurities and stabilizers can inhibit polymerization and lead to unpredictable curing times and properties.

Innovation Solution

A polymerizable composition comprising 2-methylene-1,3-dicarbonyl compounds and specific ionic compounds, such as bissulfonylimide anions and hexafluorophosphate anions, which do not react with the 2-methylene-1,3-dicarbonyl compounds, combined with a polymerization initiator, to promote curing while maintaining storage stability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If a 2-methylene-1,3-dicarbonyl compound is used to achieve rapid curing at low temperature, then productivity is improved, but storage stability deteriorates due to unexpected polymerization caused by impurities

Engineering Contradiction:

Improvecuring rateVSAvoidstorage stability

Core Design Contradiction:

ProductivityVSReliability

Solution Approach 1:

A specific ionic compound acts as an intermediary between the 2-methylene-1,3-dicarbonyl compound and the polymerization initiator. This ionic compound suppresses unexpected polymerization during storage by neutralizing acidic impurities, while allowing rapid polymerization to proceed when the polymerization initiator is intentionally added for curing

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent changes the chemical environment by introducing a specific ionic compound that modifies the pH and reactivity parameters of the system. This creates a state where the compound is stable during storage but highly reactive when triggered by the polymerization initiator, thus resolving the contradiction between storage stability and curing rate

Inventive Principle:

Principle #35Parameter changes

2Reliability

If stabilizers are added to suppress unexpected polymerization, then storage stability is improved, but curing rate deteriorates due to inhibition of polymerization

Engineering Contradiction:

Improvestorage stabilityVSAvoidcuring rate

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The specific ionic compound serves as a selective intermediary that differentiates between spontaneous polymerization (caused by acidic impurities) and initiator-triggered polymerization. It suppresses the former while permitting the latter, thus improving storage stability without sacrificing curing rate

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The ionic compound provides localized stabilization specifically针对酸性不純物-induced polymerization, while leaving the polymerization pathway accessible to the intended polymerization initiator. This selective action resolves the contradiction by applying different qualities to different polymerization mechanisms

Inventive Principle:

Principle #3Local quality

3Ease of manufacture

If impurities are present in the 2-methylene-1,3-dicarbonyl compound, then manufacturing cost is reduced, but polymerizability deteriorates due to acid-generated inhibition

Engineering Contradiction:

Improveproduction costVSAvoidpolymerizability

Core Design Contradiction:

Ease of manufactureVSProductivity

Solution Approach 1:

The patent converts the harmful effect of acidic impurities into a beneficial feature by adding a specific ionic compound that neutralizes these impurities. The impurities, which would normally inhibit polymerization, are transformed into a condition that the ionic compound can effectively manage, thus maintaining polymerizability without requiring ultra-pure materials

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

Solution Approach 2:

The ionic compound acts as a mediator that bridges the gap between impure raw materials and high polymerizability. It tolerates the presence of impurities while ensuring that the polymerization reaction can proceed efficiently when triggered by the polymerization initiator

Inventive Principle:

Principle #24Intermediary (Mediator)

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 approach allows for a curable resin composition that cures rapidly when contacted with a polymerization initiator, while maintaining long-term storage stability and improved physical properties of the cured product, suitable for electronic components.

Implementation Method 1

it has been known that this inhibition of polymerization is caused by an acid generated from a by-product, such as a ketal

Methodology Applied

Scientific EffectAcid-base neutralization:

Implementation Method 2

a reaction rate of anionic polymerization is susceptible to impurities

Methodology Applied

Scientific EffectAnionic polymerization:

Data Source

PatentEP4047024B1Polymerizable composition and curable resin composition using same

Publication Date: 2024.07.10 NAMICS CORPORATION

AI summary

An object of the present invention is to provide a polymerizable composition capable of promoting anionic polymerization of a 2-methylene-1,3-dicarbonyl compound without impairing storage stability. The polymerizable composition of the present invention comprises (a) at least one 2-methylene-1,3-dicarbonyl compound and (b) at least one ionic compound comprising a specific anion.