TETRAFLUOROETHYLENE COPOLYMER AND PROCESS FOR PREPARING THE SAME

摘要

A copolymer of tetrafluoroethylene and a perfluoro(alkyl vinyl ether) having the formula (I): CF2=CF-O-Rf (I) wherein Rf is a perfluoroalkyl group having 3 or 4 carbon atoms; said copolymer having 1 to 10 % by weight of the perfluoro(alkyl vinyl ether) units, having 7 to 20, per 10<6> carbon atoms, of terminal groups -CONH2, having substantially no -CH2OH and no -COF, and having a melt viscosity at 380 DEG C of 0.1 x 10<4> to 100 x 10<4> poise and a preparation process thereof. The tetrafluoroethylene copolymer is thermally stable and has excellent powder properties. Molded articles thereform have a few bubbles and excellent dimensional stability on heating.