Modified Polyamine Pigment Dispersant for Color Filter Heat Resistance

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Solution Overview

Problem

Current pigment dispersants for color filters fail to maintain color tone stability and purity during high-temperature processing, lacking sufficient heat resistance for applications like color filter production.

Innovation Solution

A modified polyamine is developed by reacting a polyamine with a polyester and a phosphorus-containing compound, forming a salt that enhances pigment dispersion performance and heat resistance, maintaining color tone stability even at elevated temperatures.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If a conventional pigment dispersant is used, then pigment dispersion performance is achieved, but color tone stability deteriorates during high-temperature processing

Engineering Contradiction:

Improvecolor tone stabilityVSAvoidheat resistance

Core Design Contradiction:

ReliabilityVSTemperature

Solution Approach 1:

The invention uses a composite dispersant system combining a polyamine component and a phosphorus-containing compound component. This composite approach creates synergistic effects where the phosphorus-containing compound enhances heat resistance and color tone stability during high-temperature processing, while the polyamine component provides pigment dispersion performance. The combination resolves the contradiction by integrating materials with complementary properties.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The invention optimizes the ratio of the phosphorus-containing compound component to the polyamine component within 5-50 mass%. This parameter adjustment allows tuning of the dispersant's thermal properties while maintaining dispersion effectiveness. By controlling this compositional parameter, the dispersant achieves both good color tone stability and heat resistance during high-temperature processing.

Inventive Principle:

Principle #35Parameter changes

2Productivity

If heating is performed during color filter production, then manufacturing process is completed, but color purity deteriorates due to color tone change

Engineering Contradiction:

Improvemanufacturing efficiencyVSAvoidcolor purity

Core Design Contradiction:

ProductivityVSManufacturing precision

Solution Approach 1:

The dispersant is formulated in advance with phosphorus-containing compounds that provide heat-resistant properties before the high-temperature processing step. This preliminary preparation ensures that when heating occurs during manufacturing, the color tone remains stable and color purity is maintained. The phosphorus-containing compound acts as a preventive measure against thermal degradation.

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The invention converts the potentially harmful effect of high-temperature heating (which causes color tone change and reduces color purity) into a beneficial process by using the heat-resistant properties of the phosphorus-containing compound. The thermal processing that would normally degrade color quality instead becomes an effective manufacturing step that maintains or even enhances dispersion stability while completing the manufacturing process.

Inventive Principle:

Principle #22Blessing in disguise (Convert harm into benefit)

3Manufacturing precision

If a dispersant with good pigment dispersion performance is used, then dispersion quality is improved, but heat resistance is insufficient

Engineering Contradiction:

Improvedispersion qualityVSAvoidheat resistance

Core Design Contradiction:

Manufacturing precisionVSTemperature

Solution Approach 1:

The invention merges two dispersant components with different strengths: the polyamine component provides excellent pigment dispersion performance through its functional groups that interact with pigment surfaces, while the phosphorus-containing compound component provides heat resistance and color tone stability. The combination creates a unified dispersant system that delivers both dispersion quality and thermal stability simultaneously.

Inventive Principle:

Principle #5Merging (Combining)

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 modified polyamine effectively disperses pigments while maintaining color tone stability and purity, offering high thermal decomposition temperatures and excellent heat resistance, suitable for high-temperature processes in color filter production.

Implementation Method 1

the polyamine and the phosphorus-containing compound form a salt through a free amino group of the polyamine and a hydroxyl group of the phosphorus-containing compound

Methodology Applied

Scientific EffectSalt formation reaction: Chemical Bonding

Data Source

PatentEP2594599B1Denatured polyamine

Publication Date: 2015.06.03 AJINOMOTO CO INC

AI summary

Provided is a pigment dispersant which includes a modified polyamine produced by a reaction of a polyamine having two or more primary and/or secondary amino groups per molecule and containing 2 to 1800 nitrogen atoms per molecule, a polyester, and a phosphorus-containing compound, and therefore exhibits excellent pigment dispersion performance, shows little change in color tone by heating, and has excellent heat resistance.