US Patent 8240087 Sliding window assembly having an encapsulation with a silicone-based polymer

A sliding window assembly for a vehicle includes a sliding panel and a rail. The rail defines a channel for receiving the sliding panel. The sliding panel is movable between a closed position and an open position along the rail. An encapsulation at least partially encapsulates the sliding panel. The encapsulation includes a silicone-based polymer that has a minimal coefficient of friction. The encapsulation provides operational advantages to the sliding window assembly.