Silicone PSA Composition for Clean Release on Anti-Fingerprint Coatings
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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 for 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, cyanate-functional silane, and optional solvent, which can be cured to form a protective film that cleanly releases from the anti-fingerprint hard coating.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional silicone pressure sensitive adhesives are used, then the adhesive can be applied to substrates, but the adhesion to anti-fingerprint hard coatings is insufficient
Solution Approach 1:
The patent modifies the chemical composition parameters of the silicone pressure sensitive adhesive by incorporating specific additives including cyanate-functional silane, anchorage additives, and hydrosilylation reaction inhibitors. These parameter changes in the adhesive formulation enable sufficient adhesion to anti-fingerprint hard coatings while maintaining the required low friction properties.
Solution Approach 2:
The invention creates a composite adhesive system by combining multiple components: base silicone polymer, cyanate-functional silane additive, anchorage additive, and hydrosilylation reaction inhibitor. This composite material approach allows the adhesive to simultaneously achieve strong adhesion to anti-fingerprint coatings and maintain low dynamic coefficient of friction.
2Strength
If the adhesive provides strong adhesion to anti-fingerprint hard coating, then protection is improved, but the dynamic coefficient of friction increases making removal difficult
Solution Approach 1:
The patent carefully adjusts the formulation parameters of the adhesive, specifically incorporating cyanate-functional silane and anchorage additives in controlled amounts. These parameter modifications enable the adhesive to achieve strong adhesion while maintaining a low dynamic coefficient of friction, allowing easy removal without residue.
Solution Approach 2:
The adhesive formulation incorporates specific functional components that create different local properties: the cyanate-functional silane and anchorage additives provide strong bonding to the anti-fingerprint coating, while the overall composition maintains low friction characteristics for easy removal. This local quality differentiation resolves the contradiction between strong adhesion and easy removal.
3Ease of operation
If the adhesive is designed for easy removal, then residue is reduced, but the protective film may not adhere sufficiently during processing
Solution Approach 1:
The patent optimizes the chemical composition parameters of the adhesive by incorporating cyanate-functional silane, anchorage additives, and hydrosilylation reaction inhibitors in specific proportions. This parameter optimization enables the adhesive to provide sufficient hold during processing while allowing clean release without residue, resolving the contradiction between adhesion strength and clean removal.
Solution Approach 2:
The adhesive formulation is designed to exhibit dynamic properties: strong adhesion during the processing and shipping phases, then clean release when removal is required. The combination of cyanate-functional silane and anchorage additives creates this dynamic behavior, allowing the adhesive to switch between strong bonding and clean removal modes.
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 adheres to and protects the anti-fingerprint hard coating, ensuring clean release without residue, thereby safeguarding the display device during handling and shipping.
Implementation Method 1
A silicone pressure sensitive adhesive (Si-PSA) composition and method for its preparation are disclosed. The Si-PSA composition is curable to form a Si-PSA on various substrates.
Implementation Method 2
The Si-PSA composition achieves low dynamic coefficient of friction and high peel adhesion, enabling effective protection of anti-fingerprint hard coatings without leaving residue
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.