EXAMPLE - Fluoro compound (CF2ClCFClI) (in g) (118) and azobis isobutyro nitrile (1.1) were added to a 200 ml glass reactor and heated at 75 degrees C. A fluorine containing compound (CH2=CHCH2C(CF3)2OCH2OCH3) (75.8) was dropped for 1 hour and stirred at 75 degrees C for 7 hours. The resulting mixture was vacuum distilled and fluorine compound of formula: CF2ClCFClCH2CHI(CH2C(CF3)2OCH2OCH3) (144) was obtained. Tetrahydrofuran (THF) (150 ml) and the obtained product (144) were added to a 2 l glass reactor and cooled to -75 degrees C. 2M THF (220 ml) of propylene magnesium chloride (CH2=CHCH2MgCl) was dropped for 2 hours and stirred at -75 degrees C for 3 hours. Saturation ammonium chlorine aqueous solution (400 ml) was added and temperature was raised to room temperature. The reaction liquid was liquid-separator and organic layer was concentrated. Subsequently, vacuum distillation was performed and reaction product (66.3) was obtained. Zinc (30) and water (100) were added to 200 ml glass reactor and heated at 85 degrees C. The obtained reaction product (66.3) was dropped and stirred for 24 hours. The reaction liquid was filtered, liquid separated and vacuum distilled, and fluorine containing monomer (CF2=CFCH2CH(CH2C(CF3)2OCH2OCH3)CH2CH=CH2 (23.6) was obtained. The obtained monomer (5.6) was added to a pressure-resistant reactor, prefluoro benzoyl peroxide (0.14) was added as polymerization initiator, and freezing deaeration was performed. The reaction mixture was polymerized at 70 degrees C for 18 hours, and the reaction solution was dropped into hexane. The polymer was reprecipitated, vacuum dried at 105 degrees C for 20 hours and fluorine containing amorphous polymer (2.62) was obtained. The obtained polymer had number average molecular weight (Mn) of 9200 and weight average molecular weight (Mw) of 17100, Mw/Mn of 1.85 and glass transition temperature of 104 degrees C. The polymer was white powder form at room temperature, soluble in acetone, THF ethyl acetate and methanol, and insoluble in perfluoro (2-butyltetrahydro furan) and perfluoro-n-octane. Cyclopolymer having monomer unit of formulae (d), (e), and (f) was confirmed.