Photosensitive Composition Stabilizing Inorganic Microparticles

Resolve Bottlenecks,
Find Innovative Solutions
Generate Solutions

Solution Overview

Problem

Existing compositions for forming highly refractive materials face issues with excessive weight loss when heated and unstable dispersion of inorganic microparticles over time.

Innovation Solution

A composition incorporating a photopolymerizable compound with a specific structure, including radically or cationically polymerizable groups, and inorganic microparticles, which stabilizes the dispersion and prevents excessive weight loss upon heating.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Illumination intensity

If a composition with metal oxide particles and (meth)acrylate is used to form highly refractive materials, then the refractive index is improved, but the weight of components excessively decreases when heated

Engineering Contradiction:
Improverefractive indexVSAvoidweight loss of components
Core Design Contradiction:
Illumination intensityVSLoss of substance

Solution Approach 1:

The invention changes the chemical structure parameters of the photopolymerizable compound by introducing specific molecular weight components and functional groups that reduce volatility. The composition uses compounds with controlled molecular structures that maintain low vapor pressure at heating temperatures, thereby preventing excessive weight loss while preserving the high refractive index property.

Inventive Principle:
Principle #35Parameter changes

Solution Approach 2:

The invention creates a composite material system combining metal oxide particles with specifically designed photopolymerizable compounds. This composite approach allows the organic component to serve multiple functions: maintaining dispersion stability, preventing weight loss through controlled volatility, and enabling photopolymerization. The synergistic combination resolves the contradiction between achieving high refractive index and preventing component loss.

Inventive Principle:
Principle #40Composite materials

2Illumination intensity

If a composition with metal oxide particles and (meth)acrylate is used to form highly refractive materials, then the refractive index is improved, but the dispersion stability of inorganic microparticles deteriorates over time

Engineering Contradiction:
Improverefractive indexVSAvoiddispersion stability
Core Design Contradiction:
Illumination intensityVSStability of the object's composition

Solution Approach 1:

The photopolymerizable compound acts as an intermediary substance between the metal oxide particles and the final cured material. This intermediary provides steric and chemical stabilization to the particle dispersion, preventing aggregation over time. The compound's molecular structure includes segments that interact with particle surfaces and segments that provide solubility and stability in the composition matrix.

Inventive Principle:
Principle #24Intermediary (Mediator)

Solution Approach 2:

The invention modifies the physical-chemical parameters of the dispersion medium by using photopolymerizable compounds with specific molecular weights, functional groups, and polarity characteristics. These parameter changes enhance the compatibility between the inorganic particles and the organic matrix, maintaining stable dispersion while enabling the formation of highly refractive cured materials.

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

The composition effectively maintains the stability of inorganic microparticles and prevents excessive weight loss when heated, ensuring a stable dispersion and maintaining material properties.

Implementation Method 1

a photopolymerizable compound (A) includes a compound represented by following formula (A1)

Methodology Applied
Scientific EffectPhotopolymerization: Photopolymerisation

Data Source

PatentUS20240384056A1Composition and photosensitive composition
Publication Date: 2024.11.21 TOKYO OHKA KOGYO CO LTD
  • US20240384056A1 patent drawing
  • US20240384056A1 patent drawing
  • US20240384056A1 patent drawing

AI summary

A photosensitive composition which tends to hardly occur excessive decrease of weight of a component (in which is a component other than a solvent, when the composition or the photosensitive composition includes the solvent) in the composition or the photosensitive composition by heating, and include inorganic microparticles in a stably dispersed state, a cured product of the photosensitive composition, a compound which can be preferably added to the composition and the photosensitive composition, and a production method of the compound are provided. In a composition including a photopolymerizable compound (A) and inorganic microparticles (B) or a photosensitive composition including a photopolymerizable compound (A), inorganic microparticles (B), and an initiator, a compound with a specific structure having a radically polymerizable group-containing group or a cationically polymerizable group-containing group is used as the photopolymerizable compound (A).