Azo Compound Film Stability and Solubility
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Solution Overview
Problem
Existing compositions for forming polarizing films with azo compounds suffer from insufficient storage stability, leading to defects in the formed film, and require improved solubility of dichroic dye compounds.
Innovation Solution
An azo compound represented by formula (1A) is developed, which includes specific divalent linking groups, aliphatic hydrocarbon groups, and polymerizable groups, enhancing its solubility and stability as a composition, even when stored with a solvent for a predetermined time.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If an azo compound with fused heterocyclic group is used as dichroic dye, then the polarizing film can be formed, but the storage stability is insufficient and defects occur in the formed film
Solution Approach 1:
The patent modifies the molecular structure parameters of the azo compound by introducing specific substituent groups (alkyl, alkoxy, aryl, heteroaryl) at defined positions (R1-R6) and using specific linking groups (L1-L3) to improve storage stability while maintaining film formation capability
Solution Approach 2:
The invention creates a composite azo compound structure combining fused heterocyclic groups (for polarizing function) with stabilizing substituent groups and specific linking groups, forming a multi-functional molecular composite that simultaneously achieves film formation and storage stability
2Ease of operation
If the solubility of dichroic dye compound is improved, then the compound can be processed more easily, but further improvement in solubility is still required
Solution Approach 1:
The patent systematically varies the substituent parameters (R1-R6 representing different hydrocarbon and heterocyclic groups) and linking group parameters (L1-L3 representing oxygen, carbonyl, or methylene linkages) to optimize both solubility and storage stability simultaneously
Data Source
AI summary
An azo compound is represented by formula (1A). L1 and L2 each represent a divalent linking group or a single bond. y represents 1 or 2. p and q each represent 0 or 1, and at least one of p and q is 1. X represents an oxygen atom or NR5, and R5 represents a hydrogen atom or an aliphatic hydrocarbon group. R12, R13, and R14 each represent an aliphatic hydrocarbon group, and may each have a polymerizable group. Q represents a single bond or a group selected from —OC(═O)—, —C(—O)O—, —C═C—, —CH═CH—, —N═N—, —NHC(═O)—, and —C(═O)NH—. Ar1, Ar2, and Ar3 each represent a 1,4-phenylene group or a divalent sulfur-containing aromatic heterocyclic group. When y is 2, two Ar3s may be the same or different.