Pulverized Infrared-Absorbing Masterbatch with Protective Coating

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Solution Overview

Problem

Existing infrared absorbing structures, such as those using composite tungsten oxide fine particles, suffer from insufficient chemical resistance, particularly when exposed to high-temperature alkaline solutions, leading to the loss of infrared absorption function.

Innovation Solution

Pulverized masterbatch products containing infrared absorbing fine particles, dispersed in a specific resin and coated with a protective layer, exhibit excellent chemical resistance even when immersed in high-temperature alkaline solutions, maintaining infrared absorption properties.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If composite tungsten oxide fine particles are used as infrared absorbing material, then infrared absorption properties are improved, but chemical resistance deteriorates when exposed to high-temperature alkaline solutions

Engineering Contradiction:

Improveinfrared absorption propertiesVSAvoidchemical resistance

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a protective coating layer as an intermediary substance between the infrared absorbing fine particles and the alkaline environment. This coating layer acts as a barrier that prevents the alkaline solution from directly contacting and dissolving the tungsten oxide particles, thereby maintaining both infrared absorption properties and chemical resistance simultaneously

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The patent creates a composite structure by combining infrared absorbing fine particles with a protective coating material. This composite approach allows the system to exhibit both the infrared absorption capability of the tungsten oxide particles and the chemical resistance of the coating layer, resolving the contradiction between optical performance and chemical stability

Inventive Principle:

Principle #40Composite materials

2Object-affected harmful factors

If infrared absorbing fine particles are dispersed in resin to improve chemical resistance, then chemical resistance is improved, but infrared absorption properties may deteriorate

Engineering Contradiction:

Improvechemical resistanceVSAvoidinfrared absorption properties

Core Design Contradiction:

Object-affected harmful factorsVSReliability

Solution Approach 1:

The patent applies local quality by providing protective coating only at the surface of the infrared absorbing fine particles rather than throughout the entire particle volume. This allows the core particle to maintain its infrared absorption properties while the surface coating provides chemical resistance, resolving the contradiction between these two functions

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 pulverized masterbatch products provide excellent chemical resistance and maintain infrared absorption properties, ensuring durability and effectiveness in various applications.

Implementation Method 1

infrared absorbing fine particles... having excellent infrared absorption properties (which absorbs light in an infrared region)

Methodology Applied

Scientific EffectInfrared absorption: Absorption (EM radiation)

Data Source

PatentEP3660079B1Infrared-absorbing-fine-particle-containing masterbatch pulverized product, dispersion containing infrared-absorbing-fine-particle-containing masterbatch pulverized product, infrared-absorbing-material-containing ink, Anti-counterfeiting ink employing same, Anti-counterfeiting print film, and method for manufacturing infrared-absorbing-fine-particle-containing masterbatch pulverized product

Publication Date: 2025.07.16 SUMITOMO METAL MINING CO LTD

AI summary

There are provided pulverized masterbatch products containing infrared absorbing fine particles, dispersion liquid containing pulverized masterbatch products containing infrared absorbing fine particles, ink containing infrared absorbing material, and anti-counterfeit ink and an anti-counterfeit printed matter using them, having excellent infrared absorption properties and having excellent chemical resistance, and a method for producing the pulverized masterbatch products containing infrared absorbing fine particles. The pulverized masterbatch products containing infrared absorbing fine particles have a dispersed particle size of 1µm or more, and contain resin with infrared absorbing fine particles dispersed inside.