8 g octafluoropentyl methacrylate 2 g 3 mercaptopropyl methyldimethoxysilane 0 01 g toluene 2 g and aibn 0 01 g are subjected to polymerization reaction at 60 u00b0 c for 8 hours to give a copolymer resin the resin is mixed with n butyl tin oxide 0 05 g and the mixture is applied onto a surface of glass plate and is allowed to stand at room temperature for 7 days as the result the product comb shaped polymer shows excellent water repellency and also oil repellency in the same manner as described in example 1 1 heat polymerization at 60 u00b0 c in example 2 1 photopolymerization and in example 1 2 polycondensation except that the ingredients as shown in table 1 are used there are produced various comb shaped polymers in all examples the used chain transfer agent is 3 mercaptopropyl methyldimethoxysilane table 1______________________________________ chain tol heat orex vinyl monomer transfer aibn uene photopoly no g agent g g g merization______________________________________ 4 mma 50 1 8 0 16 25 heat 5 ba 50 0 5 photo 6 ba 10 ga 1 0 5 photo 7 ea 10 0 5 photo 8 ea 10 ga 1 0 5 photo 9 st 10 man 0 5 0 3 0 01 2 heat10 st 10 0 3 0 01 2 heat4meta 0 3 11 mma 10 0 3 0 01 2 heatman 0 5 12 mma 10 0 3 0 01 2 heat4meta 0 3 13 ea 10 man 0 3 0 3 0 01 2 heat14 ea 10 0 3 0 01 2 heat4meta 0 3 15 mma 9 0 3 0 01 2 heatbiscoat 4f 1 16 mma.