Heat in a drive system including a motor and a drive is removed using heat pipes in heat exchanging contact with the motor and the drive. The process comprises the steps of contacting a sample of the raw material with an extraction solvent comprising a C1-4 fluorocarbon alone or with a co-solvent, and separating the solvent liquor thus obtained containing the extract from the raw material. The seal member is a cup-shaped ring having a circular outer wall, a bottom wall and a center hole. The controller can automatically operate the dispenser for movement to a dispensing position at a predetermined time. The invention further relates to a process for preparing copolymers and to their use as dispersants.