Polyfluoropolyether Silicone PSA for Residue-Free Cover Glass Protection
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Solution Overview
Problem
Existing protective films for display devices with anti-fingerprint hard coatings do not cleanly release without leaving residue, posing a challenge in protecting cover glass during processing and shipping.
Innovation Solution
A silicone pressure sensitive adhesive (Si-PSA) composition is formulated with specific components including alkenyl-functional polyorganosiloxane, polyorganohydrogensiloxane, hydrosilylation reaction catalyst, polyorganosilicate resin, and polyfluoropolyethersilane, which can be cured to form a protective film that adheres to and cleanly releases from the anti-fingerprint hard coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a protective film is used to protect the anti-fingerprint hard coating during fabrication and shipping, then the cover glass is protected from scratches and damage, but the protective film leaves residue on the coating surface
Solution Approach 1:
The patent modifies the chemical composition parameters of the adhesive by incorporating specific ratios of silane-modified polyorganosiloxane (5-20 wt%), polyorganohydrogensiloxane (5-20 wt%), and polyorganosilicate resin (5-20 wt%), along with controlled catalyst content (0.1-5 wt%). These parameter changes enable the adhesive to achieve both strong bonding to the anti-fingerprint coating and clean release without residue.
Solution Approach 2:
The patent creates a composite adhesive system combining multiple components: silane-modified polyorganosiloxane provides base adhesive properties, polyorganohydrogensiloxane enables crosslinking, polyorganosilicate resin enhances bonding to inorganic surfaces, and the silane catalyst facilitates reaction. This composite formulation achieves optimal balance between adhesion strength and residue-free release.
2Strength
If the adhesive has strong bonding to the anti-fingerprint hard coating, then protection effectiveness is improved, but clean release becomes difficult
Solution Approach 1:
The patent optimizes the chemical parameters by controlling the silane content (5-20 wt%), hydrogen siloxane content (5-20 wt%), and catalyst concentration (0.1-5 wt%). These parameter adjustments create an adhesive with sufficient crosslinking density for strong bonding while maintaining adequate mobility for clean release during peeling.
Solution Approach 2:
The silane catalyst acts as an intermediary that mediates between the bonding requirement and release requirement. It enables controlled crosslinking reactions that provide strong adhesion to the anti-fingerprint coating while allowing the adhesive matrix to remain sufficiently flexible for clean peeling without residue transfer.
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 Si-PSA composition effectively protects the display device from scratches while ensuring clean release without residue, maintaining the integrity of the anti-fingerprint coating.
Implementation Method 1
The Si-PSA composition comprises: (E) a polyfluoropolyether silane
Implementation Method 2
The Si-PSA composition can be cured to form a Si-PSA on various substrates
Data Source
AI summary
A silicone pressure sensitive adhesive composition is curable to form a silicone pressure sensitive adhesive. The silicone pressure sensitive adhesive composition can be coated on a substrate and cured to form a topside protective film. The topside protective film can be used to protect an anti-fingerprint hard coating in a screen protective film on cover glass for a display device, such as a smartphone.