Fluoro-Containing Si-PSA for Residue-Free Display Coating Release
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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 developed, comprising alkenyl-functional polyorganosiloxane, fluoro-containing polyorganohydrogensiloxane crosslinker, and other additives, which can be cured to form a topside protective film that adheres to and cleanly releases from the anti-fingerprint hard coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional protective films are used on anti-fingerprint hard coatings, then protection during processing and shipping is provided, but residue is left upon release
Solution Approach 1:
The patent modifies the chemical composition parameters of the protective film by incorporating fluoro-containing polyorganohydrogensiloxane crosslinker and specific silane compounds. This changes the adhesion and release properties of the film, enabling it to protect during processing while allowing clean release without residue on the anti-fingerprint hard coating.
Solution Approach 2:
The patent creates a composite protective film system combining multiple components: fluoro-containing polyorganohydrogensiloxane crosslinker, silane compounds, and other adhesive formulation components. This composite material achieves both strong adhesion for protection and controlled release to prevent residue, resolving the contradiction between protection effectiveness and residue-free removal.
2Strength
If strong adhesion is used to protect anti-fingerprint coating, then protection during processing is improved, but clean release becomes difficult
Solution Approach 1:
The patent incorporates fluoro-containing polyorganohydrogensiloxane crosslinker that performs preliminary chemical bonding during processing to provide strong adhesion. The same crosslinker system is designed to reversibly bond, allowing controlled release after the protective function is complete, thus achieving both strong adhesion and ease of release.
Solution Approach 2:
The patent adjusts the chemical bonding parameters by using fluoro-containing crosslinkers with specific bond strengths. These crosslinkers provide sufficient adhesion strength during processing but allow controlled release under appropriate conditions, resolving the contradiction between strong adhesion and ease of release.
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 during processing and shipping while ensuring clean release without residue, maintaining the integrity of the anti-fingerprint coating.
Implementation Method 1
The Si-PSA composition comprises: (A) an alkenyl-functional polyorganosiloxane; (B) a fluoro-containing crosslinker comprising (B1) a fluoro-containing polyorganohydrogensiloxane
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.