Perfluoroalkyleneethertriazine oligomer and process for producing the same

摘要

Perfluoroalkyleneethertriazine oligomer obtained by reacting a dinitrile compound NC-RF0-CN where Rf is -(CFXOCF2)a(CF2)b(CF2OCFX)c-, where X is a fluorine atom or a CF3 group, a is an integer of 1 to 5, b is an integer of 1 to 2 and c is an integer of 1 to 5, or Rf0 is -CF2O(CF2O)dCF2-, where d is an integer of 1 to 8, with ammonia, further reacting the resulting diamizine compound with a dinitrile compound NC-Rf1-CN, Rf1 has the same meaning as that for Rf0 or Rf1 is a perfluoroalkylene group having 4 to 8 carbon atoms thereby obtaining a perfluoroalkyleneetherpolyimidoylamizine oligomer, then reacting the resulting oligomer with a perfluoronitrile compound Rf2CN, Rf2 is CF3(OCF2)e- where e is an integer of 3 to 10 thereby treating the terminal groups thereof, and then subjecting the resulting terminal-treated oligomer to a ring-closing reaction with a perfluoroacylating agent RF3COY, Rf3 is CF3(OCF2)f- where f is an integer of 3 to 10 has a good resistance to oxidation in the presence of a metal at a high temperature, and can improve the heat resistance of a perfluoropolyetherpolytetrafluoroethylene powder-based grease, when added therto.