Photosensitive Composition for Touch Panel Moisture Barrier
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Solution Overview
Problem
Existing photosensitive compositions used in touch panels do not effectively decrease the water vapor transmission rate (WVTR) of the cured films, which is necessary for protecting the electrodes and wiring from moisture-related corrosion.
Innovation Solution
A photosensitive composition comprising a polymer with a vinylbenzene derivative unit, a radical polymerizable group, and functional groups such as primary hydroxyl or amino groups, along with a radical polymerization initiator, is used to form a cured film with reduced WVTR, suitable for touch panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional photosensitive compositions are used to form cured films for touch panels, then the films achieve basic protective properties, but the water vapor transmission rate (WVTR) is not sufficiently decreased, leading to poor moisture resistance
Solution Approach 1:
The patent modifies the chemical composition parameters of the photosensitive resin by incorporating specific functional groups (fluorine atoms, silicon atoms, specific hydroxyl group configurations) to fundamentally change the molecular structure and bonding characteristics of the cured film, thereby reducing WVTR at the molecular level
Solution Approach 2:
The patent creates a composite resin system combining multiple functional components: fluorinated compounds for hydrophobicity, silane compounds for crosslinking density, and specific polyol structures for molecular packing, achieving synergistic moisture barrier properties that individual materials cannot provide alone
2Reliability
If the photosensitive composition is designed to decrease WVTR through enhanced crosslinking or hydrophobicity, then moisture resistance improves, but the developability and sensitivity of the photosensitive layer may deteriorate
Solution Approach 1:
The patent applies different functional groups at different molecular levels: hydrophilic groups (carboxyl, hydroxyl) at specific locations for developability, while hydrophobic groups (fluorine, silicone) are distributed throughout the matrix for moisture barrier, creating local functional zones within the uniform film structure
Solution Approach 2:
The patent uses moderate concentrations of hydrophobic modifiers (0.1-10% by mass of fluorinated compounds) rather than excessive amounts, achieving sufficient moisture resistance while maintaining the photosensitive layer's developability and avoiding over-crosslinking that would prevent proper patterning
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 effectively decreases the WVTR of the cured film, preventing corrosion of touch panel electrodes and wiring by enhancing the hydrophobicity and structural refinement of the film.
Implementation Method 1
A photosensitive composition includes a polymer (P) which includes a structural unit derived from a vinylbenzene derivative, a structural unit including a radical polymerizable group, and a structural unit including at least one kind of functional group selected from the group consisting of a primary hydroxyl group and an amino group
Data Source
AI summary
Provided is a photosensitive composition including: a polymer (P) which includes a structural unit derived from a vinylbenzene derivative, a structural unit including a radical polymerizable group, and a structural unit including at least one kind of functional group selected from the group consisting of a primary hydroxyl group and an amino group, and in which the content of the structural unit derived from the vinylbenzene derivative is equal to or greater than 30% by mol; and a radical polymerization initiator.