Ethylene fluoro-containing copolymers

摘要

Ethylene fluoro-containing copolymers of the ECTFE and ETFE type, optionally in the presence of a third comonomer in amount comprised between 0.1 and 10% by moles, having a viscosity between 10<2> and 10<5> Pa.sec with shear rates of 1 sec<-1> measured at the temperature of about 30 DEG C higher than the second melting temperature, and having a rheologic curve in the diagram shear viscosity/shear-rate with a slope higher than 200, calculated as ratio between the viscosity in Pa.sec and the shear-rate in sec<-1> in the shear-rate range comprised between 1 and 10 sec<-1>, and having a processability zone with shear-rate values higher than 10 s<-> <1.