The demand for electronics, and in particular mobile devices, is growing at breakneck speed. These products, which include cell phones and pads, are all equipped with sensitive display screens that need to be shielded during processing and transport.
Specially designed self-adhesive peel-off films are therefore widely used for this purpose. These need to have very good wetting characteristics to enable them to stick to even hard-to-wet surfaces such as hard plastics and tempered glass. Their peel strength must also be stable and they must resist aging across a wide range of temperatures. On top of that, these protective films must not leave any residues behind when removed. For display screens, these films must be transparent and colorless. Finally, the many variants of this application span a wide range of required adhesive and peel forces.
This combination of needs cannot be met by traditional Pressure-Sensitive Adhesive (PSA) chemistries such as acrylic, nor by conventional benzoyl peroxide (BPO) catalyzed free-radical cure silicone PSAs.