Fluorine-containing copolymers.

摘要

A fluorine-containing copolymer comprising monomeric units of
<UnorderedLists id="ula01" listStyle="none"><ListItem>(a) tetrafluoroethylene,</ListItem><ListItem>(b) 8 to 15% by weight of hexafluoropropene on the basis of the weight of the copolymer, and</ListItem><ListItem>(c) 0.2 to 2% by weight of a fluoroalkyl vinyl ether of the formula:
<Chemistry id="chema01" num="0001"><Image id="ia01" he="7" wi="75" file="IMGA0001.TIF" imgContent="chem" imgFormat="TIFF" inline="no" /></Chemistry>wherein X is hydrogen or fluorine, and n is an integer of 3 to 9 on the basis of the weight of the copolymer, which has improved stress crack resistance and flex resistance as well as good moldability.</ListItem></UnorderedLists>