Fluorene-TiO2 Curable Composition for Transparent Cured Films

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Solution Overview

Problem

Existing curable compositions with titanium oxide microparticles struggle to achieve high transparency, resistance to loss of transparency when heated, and organic solvent resistance.

Innovation Solution

Incorporating a polymerizable fluorene compound with radical or cationic polymerizable groups and a thermal initiator, along with titanium oxide microparticles, into a curable composition to form a cured product.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If titanium oxide microparticles are mixed into the curable composition to achieve high refractive index, then the refractive index is improved, but the transparency, resistance to loss of transparency when heated, and organic solvent resistance deteriorate

Engineering Contradiction:

Improverefractive indexVSAvoidtransparency and resistance to loss of transparency

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The invention changes the chemical composition parameters by introducing a fluorene derivative with specific molecular structure and combining it with a photocationic polymerization initiator and silane-modified titanium oxide microparticles. This parameter change enables the cured product to achieve both high refractive index (1.70 or more) and high transparency by optimizing the molecular-level interactions between components

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system consisting of fluorene derivative polymer, silane-modified titanium oxide microparticles, and photocationic polymerization initiator. The silane modification on titanium oxide surface creates a composite structure that prevents particle aggregation and maintains transparency while achieving high refractive index, resolving the contradiction between refractive index and transparency

Inventive Principle:

Principle #40Composite materials

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 high transparency, resistance to transparency loss when heated, and excellent organic solvent resistance.

Implementation Method 1

the initiator (C) includes a thermal initiator (C1)

Methodology Applied

Scientific EffectThermal initiation:

Implementation Method 2

a polymerizable fluorene compound (A1) having a radical polymerizable group-containing group or a cationic polymerizable group-containing group and a fluorene skeleton

Methodology Applied

Scientific EffectPolymerization: Photopolymerisation

Data Source

PatentUS12570858B2Curable composition, cured product, cured film, display panel, and method for producing cured film

Publication Date: 2026.03.10 TOKYO OHKA KOGYO CO LTD

AI summary

A curable composition capable of forming a cured product having a high transparency, a resistance to loss of transparency when heated, and an excellent organic solvent resistance, a cured product of the curable composition, and a method for producing a cured film using the curable composition. A polymerizable fluorene compound having a radical polymerizable group-containing group or a cationic polymerizable group-containing group and a fluorene skeleton as a polymerizable compound, and thermal initiator as an initiator are used in a curable composition including a polymerizable compound, metal oxide microparticles (B) including titanium oxide microparticles, an initiator, and a solvent.