Copolymer for fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance
AssigneeAsahi Glass Company, Limited
InventorsMasaaki Yamabe, Gen Kojima, Hiroshi Wachi, Shun-ichi Kodama
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Abstract
A copolymer for a fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance comprises vinylidene fluoride units and fluorovinyl ether units having the formula CF.sub.2 =CFOX (X represents a C.sub.3 -C.sub.9 perfluoroalkyl group which has ether bond having 1-3 oxygen atom) at a molar ratio of vinylidene fluoride units to fluorovinyl ether units of 95:5 to 50:50 and at a total content of the units of at least 80 mole %.
Claims4
A copolymer for a fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance which comprises vinylidene fluoride units and fluorovinyl ether units having the formula CF.sub.2 .dbd.CFOX, wherein x is a C.sub.3 -C.sub.9 perfluoralkyl group which has an ether bond or bonds having 1-3 oxygen atoms, at a molar ratio of said vinylidene fluoride units to said fluorovinyl ether units of 90:10 to 60:40 and at a total content of the units of at least 80 mole %;
- and perfluoro(2-bromoethyl vinyl ether) units at 0.1 to 5 mole %, based on the total copolymer.
A copolymer for a fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance which comprises vinylidene fluoride units and perfluoro(2-n-propoxypropyl vinyl ether) units, at a molar ratio of said vinylidene fluoride units to said perfluoro(2-n-propoxypropyl vinyl ether) units of 90:10 to 60:40 and at a total content of the units of at least 80 mole %;
- and perfluoro(2-bromoethyl vinyl ether) units at 0.1 to 5 mole %, based on the total copolymer.
A copolymer for a fluorine-containing elastomer having excellent low temperature resistance and alcohol resistance which comprises vinylidene fluoride units and perfluoro(2-n-propoxypropyl vinyl ether) units, at a molar ratio of said vinylidene fluoride units to said perfluoro(2-n-propoxypropyl vinyl ether) units of 90:10 to 60:40 and at a total content of the units of at least 80 mole %, and perfluoro(propylvinyl ether) units, of 15 mole % or less, based on the total copolymer.
Dependencies are inferred from the claim text.