Fluorovinyl ether

摘要

A fluorovinyl ether of the formula: Rf-(OCF2CF2CF2)n-OCF=CF2(I) wherein Rf is a C1--C5 perfluoroalkyl group, n is an integer of 1 to 4 provided that when n is 1 (one), Rf is other than a trifluoromethyl group, a copolymer of which with an ethylenically unsaturated compound has a low glass transition temperature and improved low temperature properties.