Abstract: A fluorine-containing triallyl isocyanurate of the formula [I]: wherein at least one of X and Y is a fluorine atom, and the other is a hydrogen atom or a fluorine atom, exhibits good curing properties even when it is used as a crosslinking aid for elastomers which are required to have good heat resistance, such as in particular, fluororubbers, and provides cured materials having good mechanical properties and heat resistance.

Abstract: A fluorine-containing elastomeric copolymer comprising 55 to 62 mole % of repeating units derived from tetrafluoroethylene and 38 to 45 mole % of repeating units derived from perfluoro(methyl vinyl ether) which is obtained by radically polymerizing the monomers in the presence of a diiodide compound of the formula: RI.sub.2 in which R is a saturated fluorohydrocarbon or chlorofluorohydrocarbon group having 1 to 16 carbon atoms, or a hydrocarbon group having 1 to 3 carbon atoms and which has a Mooney viscosity (ML.sub.1+10 100.degree. C.) in the range between 20 and 150. This copolymer has an excellent compression set at high temperature, which is an important property for sealing members.

Abstract: The present inventions provide methods to produce fluorinated vinyl ether by reacting fluorinated carboxylic acid halogenide with a metal compound below the decomposition temperature for the corresponding metal salt in the absence of solvent and then raising the temperature of the produced corresponding metal salt above the decompostion temperature. With these production methods, fluorinated vinyl ether of a high purity can be obtained on an efficient basis.

Abstract: A fluorine-containing non-crystalline copolymer comprising 10 to 90% by mole of repeating units derived from tetrafluoroethylene and 90 to 10% by mole of repeating units derived form a fluorovinyl ether of the formula:CH.sub.2 .dbd.CHOCH.sub.2 (CF.sub.2).sub.n X (I)wherein X is a halogen atom or a hydrogen atom and n is a number of 2 to 8, and a copolymer comprising repeating units derived from tetrafluoroethylene, the fluorovinyl ether (I) and a third monomer selected from the group consisting of vinylidene fluoride and ethylene in which the content of repeating units derived from the third monomer is from 1 to 80% by mole in case of vinylidene fluoride or from 10 to 60% by mole in case of ethylene, and the reminder consists of the repeating units derived form tetrafluoroethylene and the fluorovinyl ether (I) in a molar ratio of 1:9 to 9:1, which have good low temperature properties as well as resistance to heat, oil and chemicals.