Fluorhaltige kristalline Copolymere und Verfahren zu ihrer Herstellung

摘要

Crystalline copolymers of ethylene and tetrafluoroethylene of high thermal stability characteristics in the molten state and high resistance to oxidation under heat, having a contact in tetrafluoroethylene from 53 to 63% in moles, homogeneously distributed along the chain axis and among the chains characterized in that the temperature gap between their ultimate melting temperature and the temperature at which oxidative decomposition of the copolymers begins is at least 80 DEG C. They are prepared by polymerization of monomers mixtures having a content in tetrafluoroethylene greater than 78% in moles.