Graft copolymer and composition thereof

A graft copolymer comprising a copolymerized product of

• (A) 2 to 66 percent by weight of an organic solvent-soluble fluoro-polymer having, via a urethane linkage, at least one radically polymerizable unsaturated bond moiety,
• (B) 4 to 40 percent by weight of a polysiloxane, of which one terminal group is radically polymerizable, wherein said polysiloxane is represented by at least one compound corresponding to the general formula (1) or (2):
• wherein R1 is selected from the group consisting of a hydrogen atom and a hydrocarbyl group of 1 to 10 carbon atoms, R2, R3, R4, R5 and R6 are the same or different and are respectively selected from the group consisting of a hydrogen atom and a hydrocarbyl group of 1 to 10 carbon atoms, and n is an integer of 2 or greater, or
• wherein R7 is selected from the group consisting of a hydrogen atom and a hydrocarbyl group of 1 to 10 carbon atoms, R8, R9, R10, R11, and R12 are the same or different and are at least one, respectively, selected from the group consisting of a hydrogen atom and a hydrocarbyl group of 1 to 10 carbon atoms, p is an integer of 0 to 10, and q is an integer of 2 or greater,
• (C) 1 to 50 percent by weight of a radically polymerizable monomer having at least one radically polymerizable double bond and at least one fluoroalkyl group per molecule, and
• (D) 4 to 93 percent by weight of a radically polymerizable monomer, other than any of components (A), (B) and (C), provided that the sum of the amounts of components (A), (B), (C), and (D), when considered in combination with impurities, is 100 percent by weight.