Liquid Crystal Alignment Agent Oxetane Oxirane Polymer
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Solution Overview
Problem
Existing liquid crystal alignment films lack sufficient solvent resistance and display characteristics, such as liquid crystal alignment properties and voltage holding ratio, which are essential for high-quality liquid crystal elements in modern displays like large-screen TVs and small terminals.
Innovation Solution
A liquid crystal alignment agent containing a polymer with an oxetane ring and oxirane ring structure, functional groups that react with these rings by heating, and optically aligning groups, which form a liquid crystal alignment film with improved solvent resistance and display characteristics.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional liquid crystal alignment agents (polymer with cinnamic acid structure and maleimide structure) are used, then liquid crystal alignment properties can be achieved, but solvent resistance is insufficient
Solution Approach 1:
The patent uses a composite polymer structure combining poly(maleimide-co-styrene) main chain with cinnamic acid side chains. This composite structure provides both the alignment functionality from the cinnamic acid groups and the solvent resistance from the maleimide-co-styrene backbone, resolving the contradiction between solvent resistance and display characteristics
Solution Approach 2:
The patent modifies the chemical structure parameters of the alignment agent by introducing specific functional groups (cinnamic acid, maleimide, styrene) with particular molecular weights and ratios. These parameter changes optimize both solvent resistance and display characteristics simultaneously
2Reliability
If rubbing method is used to impart alignment capacity, then liquid crystal alignment can be achieved, but dust and static electricity generation occurs causing display defects
Solution Approach 1:
The patent replaces the mechanical rubbing method with an optical alignment method using UV irradiation. The cinnamic acid groups in the polymer undergo photopolymerization when exposed to UV light, creating alignment capacity without mechanical contact, thus eliminating dust and static electricity generation while maintaining liquid crystal alignment properties
3Object-generated harmful factors
If optical alignment method is used, then dust and static electricity generation is curtailed, but uniform alignment capacity distribution must be ensured
Solution Approach 1:
The patent incorporates cinnamic acid groups uniformly distributed throughout the poly(maleimide-co-styrene) polymer chain. This homogeneous distribution ensures that UV irradiation produces uniform alignment capacity across the entire film, achieving precise manufacturing results while maintaining the advantages of optical alignment
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 proposed solution enables the formation of liquid crystal alignment films with enhanced solvent resistance, alignment properties, and voltage holding ratio, ensuring better display quality and durability in various liquid crystal elements.
Implementation Method 1
a functional group (B) that reacts with at least one of the oxetane ring and the oxirane ring by heating
Implementation Method 2
a method for imparting anisotropy to a film by irradiating a radiation sensitive organic thin film formed on a substrate with polarized or non-polarized radiation, thereby controlling the alignment of the liquid crystal
Data Source
AI summary
Provided is a liquid crystal alignment agent that makes it possible to obtain a liquid crystal alignment film having a superior balance among solvent resistance, liquid crystal alignment properties, and voltage holding ratio. The liquid crystal alignment agent contains a polymer [P] including: at least one ring structure of an oxetane ring and an oxirane ring; (B) a functional group that reacts with at least one of the oxetane ring and the oxirane ring by heating; and (C) an optically aligning group.