Adhesion performance and recovery of platinum catalyzed silicone PSAs under various temperature conditions for flexible display applications

We have previously performed stress relaxation tests to confirm the recovery of acrylic pressure-sensitive adhesives (PSAs) for flexible display applications. In this study, we investigate the influence of the crosslinking density of solvent-based silicone PSAs on their adhesion and recovery using a platinum catalyst (Pt) as a crosslinking agent. The peel strength and probe tack of the silicone PSAs increased in direct relation to the Pt content, until the Pt content reached 0.5-1.0 phr. Although these results prompted us to investigate the recovery of crosslinked silicone PSAs, there is a discrepancy between the low release force of silicone PSAs (0-0.5 phr of Pt) and that of the fluorine release film. For this reason, it was very hard to obtain reliable, reproducible results for silicone PSAs. Instead, we chose to investigate the recovery of a silicone PSA crosslinked with 1.0 phr of a crosslinking agent with a high release force. This combination exhibited the best adhesion performance and recovery across various temperature conditions.