Fluorine-containing copolymer
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United States of America Patent
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Oct 27, 1987
Issued Date -
N/A
app pub date -
Feb 14, 1986
filing date -
Feb 1, 1983
priority date (Note) -
Expired
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Abstract
A fluorine-containing copolymer comprising monomeric units of: (a) tetrafluoroethylene, (b) 8 to 15% by weight of hexafluoropropene on the basis of the weight of the copolymer, and (c) 0.2 to 2% by weight of a fluoroalkyl vinyl ether of the formula: CF.sub.2 .dbd.CF--O--(CF.sub.2).sub.n --CF.sub.2 X 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 good moldability and improved stress crack resistance and flex resistance when formed as an article such as a film.
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