Crosslinkable composition of fluoroelastomer and bisthiophenolperfluoroalkylidene

摘要

2,2 bis(3-mercaptophenyl)hexafluoropropane [bisthiophenol AF] is obtained in good yield by chlorosulfonating 2,2'-bisphenylhexafluoropropane and reducing the thus quantitatively obtained 2,2'-bis(3-chlorosulfonylphenyl)hexafluoropropane with zinc under acidic conditions and is effectively used as a cross-linking agent for a fluorine-containing elastomer having halogenophenyl groups as cross-linkable groups.