Halogen-containing polyether

Abstract

A halogen-containing polyether comprising repeating units of the formula: --(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.2 --(CHClCF.sub.2 CF.sub.2 O).sub.b --(CCl.sub.2 CF.sub.2 CF.sub.2 O).sub.c --(CHFCF.sub.2 CF.sub.2 O).sub.d --(CFClCF.sub.2 CF.sub.2 O).sub.e --(CF.sub.2 CF.sub.2 CF.sub.2 O).sub.f --(I) wherein a, b, c, d, e and f are each an integer not less than 0 and satisfy the following equations: 2.ltoreq.a+b+c+d+e+f.ltoreq.200 and 1.ltoreq.a+c+d+f, which may be prepared by ring-opening polymerizing 2,2,3,3-tetrafluorooxetane in the presence of an polymerization initiator to give a polyether comprising repeating units of the formula: --(CH.sub.2 CF.sub.2 CF.sub.2 O).sub.a -- (II) wherein a is the same as defined above, and optionally fluorinating and/or chlorinating the polyether (II).

Dependencies are inferred from the claim text.