PURPOSE: To provide the titled treating agent having an excellent durability and capable of imparting water repellency, oil repellency and softness simultaneously to solid materials such as textile materials, which comprises a specific copolymer of an organopolysiloxane with an organic fluorine compound as a main component.
CONSTITUTION: 5W80pts.wt. organopolysiloxane such as a compound of the formula II having 0.5W50mol% organosiloxane unit having at least one amino group-containing monovalent organic group bonded to Si in its molecule, e.g. a group of the formula I (wherein R1 is a divalent hydrocarbon residue) and 1W70mol% organosiloxane unit having at least one alkenyl group bonded to Si in its molecule and optionally 90mol% or less other organosiloxane unit is copolymerized with 95W20pts.wt. organic fluorine compound having a perfluoroalkyl group of the formula III (wherein R is H or alkyl) in the presence of a radical polymerization initiator in an organic solvent such as acetone or emulsifier and water at 30W100°C for 1W30hr. The titled treating agent is prepared by using the above product as a main component.