Cyanoacrylate Photocurable Composition With Low-Migration Fast Curing

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Solution Overview

Problem

Current photocurable compositions based on cyanoacrylate face issues such as slow curing times, toxicity concerns due to low molecular-weight photoinitiators, migration of toxic compounds, high energy requirements, and instability under temperature and acidic conditions, necessitating a need for cost-effective and efficient alternatives with lower toxicity and reduced migration.

Innovation Solution

A photocurable composition comprising a high molecular weight phosphine oxide-based photoinitiator and a metallocene compound, such as ferrocene, combined with cyanoacrylate, to enhance curing activity, stability, and reduce toxicity and migration.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Productivity

If low molecular-weight photoinitiators (TPO, TPO-L, BPO) are used, then rapid curing is achieved, but toxicity and migration of harmful compounds increase

Engineering Contradiction:

Improvecuring speedVSAvoidtoxicity and migration

Core Design Contradiction:

ProductivityVSObject-affected harmful factors

Solution Approach 1:

The patent changes the molecular weight parameter of the photoinitiator from low (TPO: 364 g/mol, TPO-L: 308 g/mol) to high (≥500 g/mol), which fundamentally alters the behavior of the photoinitiator system. High molecular weight photoinitiators maintain rapid curing capability while eliminating migration and reducing toxicity, as the larger molecules are retained within the cured matrix.

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent replaces persistent low molecular-weight photoinitiators that migrate and contaminate with high molecular weight photoinitiators that remain trapped in the cured product. This substitution eliminates the harmful 'short-living' migrating species while maintaining the functional role of photoinitiator.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Productivity

If conventional photoinitiators are used, then curing activity is achieved, but stability over time deteriorates (viscosity increase)

Engineering Contradiction:

Improvecuring activityVSAvoidviscosity stability

Core Design Contradiction:

ProductivityVSStability of the object's composition

Solution Approach 1:

The patent changes the molecular weight parameter of the photoinitiator to high (≥500 g/mol), which prevents the photoinitiator and its byproducts from causing viscosity increase over time. The high molecular weight ensures that photoinitiator fragments remain embedded in the polymer matrix rather than migrating and causing instability.

Inventive Principle:

Principle #35Parameter changes

3Reliability

If current photocurable compositions are used, then curing is achieved, but resistance to temperature and acidic conditions is insufficient

Engineering Contradiction:

Improvecuring performanceVSAvoidresistance to temperature and acid

Core Design Contradiction:

ReliabilityVSStability of the object's composition

Solution Approach 1:

The patent creates a composite system combining high molecular weight photoinitiator with metallocene compound and cyanoacrylate. This composite approach enhances the overall stability and resistance properties of the cured product, as the high molecular weight photoinitiator provides a stable foundation that resists degradation under temperature and acidic conditions.

Inventive Principle:

Principle #40Composite materials

4Reliability

If synthesis of germanium-based photocurable compositions is performed, then photocuring is achieved, but manufacturing cost increases and purification becomes difficult

Engineering Contradiction:

Improvephotocuring performanceVSAvoidsynthesis cost and purification

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent replaces expensive germanium-based photoinitiators with high molecular weight phosphine oxide-based photoinitiators that are easier and cheaper to manufacture. The high molecular weight structure eliminates the need for complex purification steps while maintaining effective photocuring performance.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

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, improved stability over time, and lower toxicity, while minimizing the migration of harmful compounds, making it suitable for various applications.

Implementation Method 1

The photoinitiator forms radical species upon irradiation with photons and initiates free-radical polymerization of unsaturated groups

Methodology Applied

Scientific EffectPhotodissociation: Photodissociation

Implementation Method 2

exposure to radiation, such as for example ultraviolet (UV) light... initiates free-radical polymerization of unsaturated groups, leading to hardening (curing) of the material

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentEP4667545A1Photocurable composition

Publication Date: 2025.12.24 BOSTIK SA(FR)

AI summary

The present invention relates to a photocurable composition comprising: - a phosphine oxide-based photoinitiator P having a molecular weight higher than or equal to 500 g/mol; - a cyanoacrylate; and - a metallocene compound.