FLUOROELASTOMERIC AND FLUOROPLASTOMERIC COPOLYMERS HAVING A HIGH RESISTANCE TO BASES

摘要

The invention relates to new fluoroelastomeric copolymers having resistance to bases and suitab1e, in particular, for preparing 0-rings, comprising: (I) VDF .......................... 47-80 mols % HFP and/or PAVE .............. 16-30 mols % hydrogenated olefin containing 2-4 C ...................... 2-25 mols % or (II) VDF .......................... 42-80 mols % PAVE ......................... 16-30 mols % hydrogenated olefin containing 2-4 C ...................... 2-30 mols % The invention further relates to new fluoroplastomeric copolymers endowed with resistance to bases, comprising: (III) VDF .......................... 70-99 mols % HFP and/or PAVE .............. 0-16 mols % hydrogenated olefin containing 2-4 C ...................... 1-30 mols % A further aspect of the invention relates to a process for preparing the abovesaid fluoroelastomeric and fluoroplastomeric copolymers.