Selective Adhesion Silicone PSA for Anti-Fingerprint Coatings
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional silicone pressure sensitive adhesives lack sufficient adhesion on anti-fingerprint coatings for display glass while exhibiting too high adhesion on other substrates, making them unsuitable for effective processing in display device fabrication.
Innovation Solution
A silicone pressure sensitive adhesive (Si-PSA) composition comprising an aliphatically unsaturated polydiorganosiloxane component, a polyorganosilicate resin, a hydrosilylation reaction catalyst, a polyorganohydrogensiloxane, and an anchorage additive, optimized to provide high adhesion on anti-fingerprint coatings while maintaining low adhesion on stainless steel substrates.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If an adhesion promoting additive is included in the silicone pressure sensitive adhesive composition, then adhesion to anti-fingerprint coating is improved, but adhesion to other substrates becomes too high
Solution Approach 1:
The adhesive composition is designed to exhibit different adhesion characteristics on different substrates through the selective use of adhesion promoters that specifically target anti-fingerprint coatings. The composition achieves high adhesion to AF glass while maintaining low adhesion to other substrates like stainless steel, allowing effective processing and release.
Solution Approach 2:
The patent optimizes the concentration and type of adhesion promoting additives within specific ranges to achieve the desired selective adhesion profile. By carefully controlling the amount of adhesion promoter and selecting specific compounds, the adhesive achieves >20 g/in on AF glass while maintaining <750 g/in on stainless steel.
2Ease of operation
If conventional silicone pressure sensitive adhesive is used, then processing is easy, but adhesion to anti-fingerprint coating is insufficient
Solution Approach 1:
The adhesive composition is formulated as a composite system combining base silicone polymer with specific adhesion promoting additives. This composite approach integrates the processing benefits of conventional silicone adhesives with the enhanced adhesion properties of specialized additives, achieving both ease of processing and sufficient adhesion to AF glass.
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 achieves peel adhesion greater than 20 g/in on anti-fingerprint coatings and less than 750 g/in on stainless steel, meeting the requirements for protective films in display devices, ensuring selective adhesion to different substrates.
Implementation Method 1
a hydrosilylation reaction catalyst; where starting materials (A), (B), and (D) are present in amounts such that molar ratio of silicon bonded hydrogen atoms in starting material (D) to aliphatically unsaturated groups in starting materials (A) and (B) (SiH/Vi ratio) is 3 to 50
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 protective film. The protective film can be adhered to an anti-fingerprint coating on display glass, such as cover glass for a smartphone.