Dye-Containing Liquid Crystal Composition for High Solubility and Light Resistance

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Solution Overview

Problem

Existing liquid crystal compositions containing dye compounds face challenges in achieving high solubility, solubility retention, light resistance, and heat resistance, with existing solutions in PTLs 1 to 4 showing room for further improvement.

Innovation Solution

A combination of one or two or more predetermined alkenyl compounds and a compound with a difluoro structure is used to create a dye compound-containing liquid crystal composition that enhances solubility, solubility retention, and light resistance.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If conventional liquid crystal compositions containing dye compounds are used, then basic liquid crystal functionality is achieved, but solubility and light resistance are insufficient

Engineering Contradiction:

Improvesolubility retentionVSAvoiddye compound solubility

Core Design Contradiction:

ReliabilityVSEase of manufacture

Solution Approach 1:

The patent uses a composite approach by combining specific liquid crystal host compounds (formulae (i) and (ii)) with dye compounds in defined ratios. This composite material system achieves both high solubility retention and reliable performance by leveraging the complementary properties of the host and guest components.

Inventive Principle:

Principle #40Composite materials

Solution Approach 2:

The patent optimizes specific parameters including the ratio of host to dye compound (5:95 to 95:5 by mass), the structural parameters of the liquid crystal compounds (R1-R6, n1-n4 values), and temperature conditions. These parameter adjustments achieve the desired balance between solubility and performance.

Inventive Principle:

Principle #35Parameter changes

2Ease of manufacture

If dye compounds are added to liquid crystal compositions to eliminate polarizing plates, then cost and transmittance improve, but light resistance deteriorates

Engineering Contradiction:

Improvedevice costVSAvoidlight resistance

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent changes the chemical parameters of the liquid crystal composition by using specific compounds with defined molecular structures (formulae (i) and (ii)) and optimizing their ratios. This achieves high light resistance while maintaining the cost advantage of dye-based systems.

Inventive Principle:

Principle #35Parameter changes

3Illumination intensity

If higher dye compound concentrations are used to improve transmittance, then optical performance improves, but solubility and stability deteriorate

Engineering Contradiction:

Improvelight transmittanceVSAvoidsolubility retention

Core Design Contradiction:

Illumination intensityVSReliability

Solution Approach 1:

The patent creates a composite system where the liquid crystal host compounds (formulae (i) and (ii)) serve as solubilizing agents for the dye compounds. This composite approach enables high dye concentrations (up to 95 mass%) while maintaining excellent solubility and stability through the host-guest interaction.

Inventive Principle:

Principle #40Composite materials

Data Source

PatentUS12215268B2Dye compound-containing liquid crystal composition and device including the same

Publication Date: 2025.02.04 DIC CORP

AI summary

An object of the present invention is to provide a dye compound-containing liquid crystal composition that has high solubility and high solubility retention for the dye compound and has high light resistance and a device including the composition. The use of a combination of one or two or more predetermined alkenyl compounds and a compound including a predetermined difluoro structure can provide a dye compound-containing liquid crystal composition that has high solubility and high solubility retention for the dye compound and has high light resistance, and the dye compound-containing liquid crystal composition is useful for devices, in particular, photochromic devices.