Infrared Cut Filter Resin Composition with Steric Repulsion
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Solution Overview
Problem
Existing resin compositions used in infrared cut filters often suffer from insufficient dispersibility and transparency in the wavelength range of 400 nm to 650 nm, which affects their performance in applications such as camera modules and solid image pickup elements.
Innovation Solution
A resin composition incorporating an infrared absorbing pigment, such as pyrrolopyrrole compounds, combined with a resin having an infrared absorbing group and a steric repulsive group, is used to form a film with improved dispersibility and transparency. This composition includes a curable compound and a photopolymerization initiator, and is processed using a method involving application, exposure, and development to create a patterned infrared cut filter.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an infrared absorbing pigment is used in a resin composition, then infrared absorption capability is improved, but dispersibility and transparency in the wavelength range of 400 nm to 650 nm deteriorate
Solution Approach 1:
A dispersant is introduced as an intermediary substance between the infrared absorbing pigment and the resin. The dispersant has a molecular structure comprising a first group that interacts with the pigment surface and a second group that is compatible with the resin, thereby improving pigment dispersion and maintaining transparency in the visible wavelength range while preserving infrared absorption capability
Solution Approach 2:
The invention creates a composite resin composition system consisting of four key components: infrared absorbing pigment, resin, dispersant, and photopolymerization initiator. This composite approach allows each component to contribute its specific function - the pigment provides infrared absorption, the resin provides the matrix structure, the dispersant ensures uniform distribution and transparency, and the initiator enables curing - thereby resolving the contradiction between infrared performance and visible light properties
2Reliability
If pigment concentration is increased to enhance infrared absorption, then infrared blocking performance is improved, but pigment aggregation increases and transparency in 400 nm to 650 nm wavelength range deteriorates
Solution Approach 1:
The dispersant acts as a mediator that enables higher pigment concentrations to be achieved without aggregation. By providing steric or electrostatic repulsion between pigment particles and ensuring compatible interaction with the resin matrix, the dispersant allows increased pigment loading while maintaining uniform distribution and transparency in the visible range
Solution Approach 2:
The invention changes the chemical and physical parameters of the resin system by introducing a dispersant with specific molecular characteristics. This parameter change - the addition of the dispersant - fundamentally alters the pigment-resin interaction, enabling higher pigment concentrations to be achieved while preventing aggregation and maintaining optical transparency
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 resulting film exhibits excellent dispersibility and transparency in the specified wavelength range, enhancing the performance of infrared cut filters and related devices by reducing pigment aggregation and improving optical properties.
Implementation Method 1
a photopolymerization initiator
Implementation Method 2
an infrared absorbing pigment; and a resin having an infrared absorbing group
Data Source
AI summary
Provided is a resin composition including: an infrared absorbing pigment; and a resin having an infrared absorbing group. In addition, provided are a film that is formed using the resin composition, an infrared cut filter, a method of manufacturing an infrared cut filter, a solid image pickup element, an infrared sensor, and a camera module.