Coloring Composition for Color Filters with Heat Resistance
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Solution Overview
Problem
Current coloring compositions for color filters experience poor heat resistance and color transfer properties during thermal curing, particularly with quinophthalone colorants and pigment dispersants, which decompose under high temperatures.
Innovation Solution
A coloring composition incorporating a colorant polymer with 2 to 14 colorant structures in a branched shape, featuring a specific linking group separated by three or more carbon atoms, and including a curable compound represented by the Formula (D-L1-Y—X—)n—R1—(R2)m, where R1 represents a (m+n)-valent linking group, X is a carbonyl or ester group, and R2 includes a repeating unit derived from a vinyl compound with an acid group.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If quinophthalone colorant or pigment dispersant is used, then solvent solubility and fastness are improved, but heat resistance and color transfer properties deteriorate due to decomposition during thermal curing
Solution Approach 1:
The invention uses a composite structure where a colorant molecule is covalently bonded to a polymer chain through a specific linking group. This creates a hybrid material that combines the coloring properties of quinophthalone colorants with the thermal stability of the polymer backbone, preventing decomposition during thermal curing while maintaining fastness properties.
Solution Approach 2:
The invention modifies the molecular structure by introducing a linking group with a specific number of carbon atoms (n=1-10) between the colorant and polymer chain. This structural parameter change allows the molecule to withstand thermal curing temperatures by providing a stable bridge that prevents decomposition, while still maintaining solubility and fastness characteristics.
2Manufacturing precision
If thermal curing is performed to form patterns, then color transfer properties are improved, but decomposition occurs leading to poor heat resistance
Solution Approach 1:
The invention converts the potential harm of thermal decomposition into a benefit by designing a polymer-colorant conjugate where the polymer backbone protects the colorant from decomposition during thermal curing. The thermal energy that would normally cause decomposition is instead utilized to cure the polymer matrix, which in turn stabilizes the colorant and enables pattern formation through controlled color transfer.
3Temperature
If ester group and ethylene group are placed adjacent to each other, then heat resistance is improved, but decomposition occurs in extremely high-temperature environments
Solution Approach 1:
The invention applies local quality by placing the ester group and ethylene group in specific positions within the polymer chain rather than adjacent to each other. The linking group structure is designed so that the ester group is separated from the ethylene group by sufficient distance, preventing decomposition in extremely high-temperature environments while still maintaining adequate heat resistance for the intended application range.
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 composition exhibits improved heat resistance and color transfer properties, reducing thermal decomposition and enhancing the performance of color filters in high-temperature environments.
Implementation Method 1
A colorant used in such a color filter is required to have the following common properties. That is, for example, it is necessary that the colorant have light absorbing properties, which are preferable from the viewpoint of color reproducibility
Implementation Method 2
further improvement in heat resistance and color transfer properties during thermal curing for forming a pattern is required
Data Source
AI summary
The coloring composition includes a curable compound and a colorant represented by (D-L1-Y—X—)n—R1—(R2)m; R1 represents a (m+n)-valent linking group, X represents —C(═O)O—, Y represents an alkylene group, L1 represents a single bond or a divalent linking group, D represents a colorant structure. R2 represents a monovalent substituent, m represents an integer of 1 to 13, n represents an integer of 2 to 14, m+n represents an integer of 3 to 15, L1 (in a case where L1 represents a single bond, D) and X are separated by Y by a distance of three or more carbon atoms, and at least one of D, L1, R1, R2, X, or Y has an acid group.