FLUOROELASTOMERS

摘要

The invention pertains to peroxide-curable fluoroelastomers which can meet the requirements for the oil and gas industry, including explosive decompression, and which can be easily processed to yield cured parts in standard machineries at reasonable throughput rates, said fluoroelastomers comprising: - recurring units derived from vinylidene fluoride (VDF); - recurring units derived from hexafluoropropylene (HFP); - recurring units derived from at least one bis-olefin [bis-olefin (OF)] having general formula : wherein R1, R2, R3, R4, R5 and R6, equal or different from each other, are H, a halogen, or a C1-C5 optionally halogenated group, possibly comprising one or more oxygen group; Z is a linear or branched C1-C18 optionally halogenated alkylene or cycloalkylene radical, optionally containing oxygen atoms, or a (per)fluoropolyoxyalkylene radical; and - iodine or bromine cure-sites; said fluoroelastomers further possessing a Mooney viscosity (ML) of at least 85 MU (1+10@121 °C), when measured according to ASTM D1646. The Applicant has surprisingly found that fluoroelastomers as above detailed, despite their high molecular weight and thus their Mooney viscosities values, can be effectively processed to yield cured parts which possess outstanding sealing and mechanical properties in particular at high temperature and/or after exposure to hostile environments (e.g. to chemicals at high temperature) so as to provide for outstanding behaviour (substantially no failure) in explosive decompression conditions.