摘要:
This invention provides a fluorine-containing copolymer comprising:(a) 50 to 85 mole % of a structural unit represented by the formula--CH.sub.2 --CF.sub.2--,(b) 5 to 40 mole % of a structural unit represented by the formula--CF.sub.2 --CFX-- wherein X is H or F, and(c) 3 to 18 mole % of a structural unit represented by the formula ##STR1##