Patent ID: 8063160
Filing Date: 2011-11-22
Classification: C08F

Abstract:
1. Propylene/ethylene copolymers comprising: an ethylene content in the range of 5 to 6.5% wt; a Mw/Mn (via GPC) in the range 3.5-5.5; a Mz/Mw (via GPC) lower than 4; a melt flow rate of 0.1 to 2 g/10′; an absence of 2-1 regioinversion; and a Melting Temperature (Tm) (non-nucleated grade) lower than 143° C., produced in a polymerization process comprising a slurry of liquid propylene as a polymerization medium having a slurry density, and in the presence of a catalyst system comprising a solid catalyst component comprising at least one titanium compound having at least one titanium-halogen bond and at least an electron-donor compound (internal donor), both supported on a magnesium chloride compound, said electron donor compound being selected from 1,3-diethers of formula (I), where R I and R II are the same or different and are hydrogen or linear or branched C 1 -C 18 hydrocarbon groups which can also form at least one cyclic structure; R III groups, equal or different from each other, are hydrogen or C 1 -C 18 hydrocarbon groups; R IV groups equal or different from each other, are C 1 -C 18 hydrocarbon groups; and each of R I to R IV groups can contain heteroatoms selected from halogens, N, O, S and Si.