Patent ID: 7459512

Claim:
A process for preparing a fluorinated polymer suitable for use in the formation of transparent optical fiber for use as a light transmission medium by copolymerizing (i) perfluoroalkyl vinyl ether represented by Formula 1 below: wherein R F is a fluorine atom or a C 1˜5 perfluoroalkyl group; A is a single bond, —(CF 2 ) n — in which n is an integer of 1 to 5, or —(CF 2 CR F 2 —O—CF 2 )— in which the substituents R F are each independently a fluorine atom or a C 1˜5 perfluoroalkyl group; is a perfluoro cyclohexyl, perfluorophenyl, perfluorodioxanyl or perfluorodioxalanyl group, (ii) perfluorinated olefin monomer in a chlorofluorinated solvent in the presence of a periluorinated radical initiator, wherein the molar ratio of (i):(ii) is between 99:1 and 50:50, and (iii) a fluorinated monomer represented by Formula 5 below: wherein R F is a fluorine atom or a C 1˜5 perfluoroalkyl group; and is a perfluoro cyclohexyl, perfluorophenyl, perfluorodioxanyl or perfluorodioxalanyl group, and wherein no C—H bonds are present in the resulting fluorinated polymer.