ELASTOMERIC COPOLYMER OF ETHYLENE WITH alpha -OLEFINS

摘要

Copolymers of ethylene with propylene and/or higher alpha -olefins and, optionally, minor proportions of a diene or polyene, which display the following properties: cristallinity content, measured as fusion enthalpy, lower than 20 J/g; solubility in pentane at 25 DEG C higher than 90%; content of propylenic units or units deriving from said alpha -olefins in the form of triads comprised between 4 and 50% of the total content of propylene or said alpha -olefins, with at least 70% of said triads having an isotactic structure; product of the monomer reactivity ratios r1.r2 comprised between 0.4 and 1; inherent viscosity higher than 1.5 dl/g.