Crystalline copolymers of propylene
AssigneeMontell Technology Company BV
InventorsLuigi Resconi, Enrico Albizzati, Romano Mazzocchi
Life of this patent
Estimating the term…
Abstract
Novel crystalline copolymers of propylene with minor proportions of ethylene and/or alpha-olefins, endowed with very good mechanical properties, a low melting point and a limited solubility in xylene at 25.degree. C., and the process for preparing them by means of the polymerization of mixtures of propylene with ethylene and/or alpha-olefins of suitable composition, by using catalysts obtained from stereorigid and chiral compounds of zirconium, and methylalumoxanic compounds.
Claims4
Crystalline copolymers of propylene with ethylene, the ethylene content of said crystalline copolymers of propylene being from 2 to 10 mole %, said crystalline copolymers of propylene having a melting point of from 110.degree. to 140.degree. C., a solubility in xylene at 25.degree. C. lower than 10% by weight, and a distribution of said ethylene such that no consecutive ethylene sequences are detectable through .sup.13 C--N.M.R. analysis.
Dependencies are inferred from the claim text.