Silicone PSA Composition for Low-Release Flexible Displays
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Solution Overview
Problem
Existing silicone pressure sensitive adhesives used in flexible display devices face challenges with high release force on the wet casting side, especially when they have low glass transition temperature (Tg) and low storage modulus (G'), leading to potential damage and failure during repeated deformations.
Innovation Solution
A hydrosilylation reaction curable composition is formulated to form a silicone pressure sensitive adhesive, comprising specific ratios of polydiorganosiloxane gum and polyorganosilicate resin components, along with a hydrosilylation reaction catalyst, to achieve low release force and good durability, suitable for flexible display devices.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the silicone pressure sensitive adhesive has low glass transition temperature (Tg) and low storage modulus (G') to improve durability and flexibility, then the release force on the wet casting side becomes very high, causing process troubles
Solution Approach 1:
The patent changes the chemical composition parameters of the silicone adhesive by incorporating specific ratios of polydiorganosiloxane gum (25-35 wt.%) and capped silicone resin (65-75 wt.%), along with controlled amounts of SiH groups (0.1-5.0 wt.%) and vinyl groups (25-35 wt.%). This compositional parameter adjustment allows the adhesive to achieve both low Tg/-10°C to -30°C/ and low G'/100-1000 Pa/ for durability while simultaneously reducing the release force to acceptable levels for wet casting processes
Solution Approach 2:
The patent creates a composite silicone adhesive system by combining multiple components with different functions: polydiorganosiloxane gum provides flexibility and low Tg, capped silicone resin provides structural integrity, SiH groups enable crosslinking for durability, and vinyl groups contribute to adhesion. This composite approach allows the adhesive to achieve low Tg and low G' for durability while the synergistic interaction of components reduces the release force on the wet casting side
2Adaptability or versatility
If the silicone pressure sensitive adhesive has low storage modulus (G') and low glass transition temperature (Tg) to release stress during deformations, then the adhesive performance improves, but the release force on the wet casting side becomes very high
Solution Approach 1:
The patent adjusts the compositional parameters to achieve G' between 100-1000 Pa and Tg between -10°C to -30°C, which provides adequate stress release capability during device deformations. Simultaneously, the controlled crosslinking density through SiH groups (0.1-5.0 wt.%) and vinyl groups (25-35 wt.%) modifies the adhesive's viscoelastic properties to reduce release force on the wet casting side to acceptable levels
3Ease of manufacture
If the adhesive is designed for low release force to facilitate wet casting process, then the manufacturing ease improves, but the durability and resistance to damage during repeated deformations may be compromised
Solution Approach 1:
The patent optimizes the compositional parameters to achieve a balance: the adhesive contains SiH groups (0.1-5.0 wt.%) and vinyl groups (25-35 wt.%) in controlled ratios to enable moderate crosslinking that provides durability, while the overall formulation maintains low release force for wet casting processability. The specific ratio of polydiorganosiloxane gum (25-35 wt.%) to capped silicone resin (65-75 wt.%) is critical in achieving this dual optimization
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 provides a silicone pressure sensitive adhesive with improved durability, low release force, and high temperature resistance, ensuring the integrity of flexible display devices during bending, folding, winding, or stretching without causing failure.
Implementation Method 1
hydrosilylation reaction curable composition
Implementation Method 2
hydrosilylation reaction catalyst
Data Source
Figure 1
AI summary
Disclosed is a silicone pressure sensitive adhesive which is prepared by curing a hydrosilylation reaction curable composition. The silicone pressure sensitive adhesive is useful in preparation of components of flexible display devices.