Resin Composition Near-Infrared Filter Heat Resistance

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Solution Overview

Problem

The existing curable resin compositions used in optical filters and solid state image sensors have insufficient heat resistance and visible light transmittance, particularly when exposed to high temperatures, leading to a decrease in near-infrared ray absorption.

Innovation Solution

A resin composition incorporating a specific coloring agent represented by formulas (I), (II), (III), or (IV), which includes chain hydrocarbon groups, aryl groups, and heteroaryl groups, along with a polymerizable compound and a polymerization initiator, to enhance heat resistance and visible light transmission.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a phthalocyanine compound is used as a coloring agent in curable resin composition, then near-infrared ray absorption is achieved, but heat resistance is insufficient and visible light transmittance is not sufficiently high

Engineering Contradiction:

Improveheat resistanceVSAvoidvisible light transmittance

Core Design Contradiction:

ReliabilityVSIllumination intensity

Solution Approach 1:

The patent changes the chemical structure parameters of the coloring agent by introducing specific substituents (aryl groups, heteroaryl groups, chain hydrocarbon groups) at defined positions on the phthalocyanine molecule. These structural parameter changes modify the electronic properties and steric environment, enabling simultaneous improvement in heat resistance and visible light transmittance while maintaining near-infrared absorption

Inventive Principle:

Principle #35Parameter changes

Solution Approach 2:

The patent creates a composite coloring agent structure by combining phthalocyanine core with multiple types of substituent groups (aryl, heteroaryl, chain hydrocarbon) containing specific atoms (O, N, F, Cl, Br, I). This composite molecular structure integrates the benefits of different functional groups to achieve both high heat resistance and high visible light transmittance

Inventive Principle:

Principle #40Composite materials

2Illumination intensity

If a phthalocyanine compound is used as a coloring agent in curable resin composition, then near-infrared ray absorption is achieved, but visible light transmittance is not sufficiently high

Engineering Contradiction:

Improvevisible light transmittanceVSAvoidheat resistance

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent modifies molecular parameters by introducing electron-donating and electron-withdrawing groups at specific positions, changing the HOMO-LUMO energy gap and electronic distribution. This parameter optimization enables the molecule to transmit visible light effectively while maintaining structural stability at high temperatures

Inventive Principle:

Principle #35Parameter changes

3Duration of action of stationary object

If the curable resin composition is heated at high temperature for predetermined time, then curing process is completed, but absorption rate of near-infrared rays decreases

Engineering Contradiction:

Improvecuring timeVSAvoidnear-infrared absorption rate

Core Design Contradiction:

Duration of action of stationary objectVSReliability

Solution Approach 1:

The patent introduces sterically hindered substituent groups (bulky aryl and heteroaryl groups) that form a protective shield around the phthalocyanine core. This beforehand cushioning prevents thermal degradation and aggregation during the high-temperature curing process, preserving the near-infrared absorption properties after curing

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

4Reliability

If substituents with specific atoms are introduced into the phthalocyanine compound, then heat resistance is improved, but molecular complexity increases

Engineering Contradiction:

Improveheat resistanceVSAvoidmolecular structure complexity

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent applies local quality by introducing functional groups at specific localized positions (2, 3, 17, 18 or 4, 5, 15, 16) rather than uniformly throughout the molecule. This localized substitution achieves heat resistance improvement with minimal increase in overall molecular complexity, maintaining ease of synthesis and processing

Inventive Principle:

Principle #3Local quality

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 resin composition exhibits improved heat resistance and visible light transmission, allowing it to effectively absorb near-infrared rays while maintaining sufficient transmittance for visible light, making it suitable as a near-infrared cut or transmission filter.

Implementation Method 1

the above-described composition absorbs near-infrared rays

Methodology Applied

Scientific EffectAbsorption (EM radiation): Absorption (EM radiation)

Implementation Method 2

The resin composition may further contain a polymerizable compound and a polymerization initiator

Methodology Applied

Scientific EffectPhotopolymerisation: Photopolymerisation

Data Source

PatentUS20230357538A1Resin composition

Publication Date: 2023.11.09 SUMITOMO CHEM CO LTD

AI summary

An objective of the present invention is to provide a resin composition capable of improving at least either one of heat resistance and visible light transmission. A resin composition according to an aspect of the present invention contains a coloring agent and a resin, and the coloring agent contains a compound represented by a formula (I), a formula (II), a formula (III) or a formula (IV).