A polypropylene composition made from or containing: A) from 60 to 90 wt %, based upon the total weight of the polypropylene composition, of a fraction insoluble in xylene at 25° C., is made from or containing more than 80% wt of propylene units, and B) from 10 to 40 wt %, based upon the total weight of the polypropylene composition, of a fraction soluble in xylene at 25° C. is made from or containing a copolymer of propylene and ethylene having an average content of ethylene derived units from 30.0 wt % to 55.0 wt %, wherein the fraction when subjected to GPC fractionation and continuous IR analysis for determining the ethylene content of the eluted fractions (GPC-IR analysis), shows that the content of ethylene increases along with the Mw for fractions having Mw higher than the average.

A polypropylene composition made from or containing: A) from 60 to 90 wt %, based upon the total weight of the polypropylene composition, of a fraction insoluble in xylene at 25° C., is made from or containing more than 80% wt of propylene units, and B) from 10 to 40 wt %, based upon the total weight of the polypropylene composition, of a fraction soluble in xylene at 25° C. is made from or containing a copolymer of propylene and ethylene having an average content of ethylene derived units from 30.0 wt % to 55.0 wt %, wherein the fraction when subjected to GPC fractionation and continuous IR analysis for determining the ethylene content of the eluted fractions (GPC-IR analysis), shows that the content of ethylene increases along with the Mw for fractions having Mw higher than the average.

The present invention relates to a multi-stage process for producing a C.sub.2 to C.sub.8 olefin polymer composition in a process comprising at least two reactors, wherein a pre-polymerized solid Ziegler-Natta catalyst is prepared by carrying out an off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a C.sub.2 to C.sub.4 olefin monomer before feeding to the polymerization process.

The present invention relates to a multi-stage process for producing a C.sub.2 to C.sub.8 olefin polymer composition in a process comprising at least two reactors, wherein a pre-polymerized solid Ziegler-Natta catalyst is prepared by carrying out an off-line pre-polymerization of a solid Ziegler-Natta catalyst component with a C.sub.2 to C.sub.4 olefin monomer before feeding to the polymerization process.

A heterogeneous procatalyst includes a preformed heterogeneous procatalyst and a metal-ligand complex. The preformed heterogeneous procatalyst includes a titanium species and a magnesium chloride (MgCl.sub.2) support. The metal-ligand complex has a structural formula (L).sub.aM(Y).sub.m(XR.sup.2).sub.b, where M is a metal cation; each L is a neutral ligand or (═O); each Y is a halide or (C.sub.1-C.sub.20)alkyl; each XR.sup.2 is an anionic ligand in which X is a heteroatom or a heteroatom-containing functional group and R.sup.2 is (C.sub.1-C.sub.20)hydrocarbyl or (C.sub.1-C.sub.20) heterohydrocarbyl; n is 0, 1, or 2; m is 0-4; and b is 1-6. The metal-ligand complex is overall charge neutral. The heterogeneous procatalyst exhibits improved average molecular weight capability. A catalyst system includes the heterogeneous procatalyst and a cocatalyst. Processes for producing the heterogeneous procatalyst and processes for producing ethylene-based polymers utilizing the heterogeneous procatalyst are also disclosed.

A heterogeneous procatalyst includes a preformed heterogeneous procatalyst and a metal-ligand complex. The preformed heterogeneous procatalyst includes a titanium species and a magnesium chloride (MgCl.sub.2) support. The metal-ligand complex has a structural formula (L).sub.aM(Y).sub.m(XR.sup.2).sub.b, where M is a metal cation; each L is a neutral ligand or (═O); each Y is a halide or (C.sub.1-C.sub.20)alkyl; each XR.sup.2 is an anionic ligand in which X is a heteroatom or a heteroatom-containing functional group and R.sup.2 is (C.sub.1-C.sub.20)hydrocarbyl or (C.sub.1-C.sub.20) heterohydrocarbyl; n is 0, 1, or 2; m is 0-4; and b is 1-6. The metal-ligand complex is overall charge neutral. The heterogeneous procatalyst exhibits improved average molecular weight capability. A catalyst system includes the heterogeneous procatalyst and a cocatalyst. Processes for producing the heterogeneous procatalyst and processes for producing ethylene-based polymers utilizing the heterogeneous procatalyst are also disclosed.

The present invention relates to a cable jacket composition comprising a multimodal olefin copolymer, said copolymer having density of 0.935-0.960 g/cm.sup.3 and MFR.sub.2 of 2.2-10.0 g/10 min and said composition having ESCR of at least 2000 hours and a cable shrinkage of 0.70% or lower. The invention further relates to the process for preparing said composition and its use as outer jacket layer for a cable, preferably a communication cable, most preferably a fiber optic cable.

The present invention relates to a cable jacket composition comprising a multimodal olefin copolymer, said copolymer having density of 0.935-0.960 g/cm.sup.3 and MFR.sub.2 of 2.2-10.0 g/10 min and said composition having ESCR of at least 2000 hours and a cable shrinkage of 0.70% or lower. The invention further relates to the process for preparing said composition and its use as outer jacket layer for a cable, preferably a communication cable, most preferably a fiber optic cable.

Disclosed herein is a cast film comprising a polyethylene composition comprising the reaction product of ethylene and optionally one or more alpha-olefin comonomers, wherein said polyethylene composition is characterized by the following properties: a melt index, I2, measured according to ASTM D1238 (2.16 kg, 190 C.), of from 1 to 20 g/10 min; a density (measured according to ASTM D792) of from 0.935 to 0.970 g/cm3; a melt flow ratio, I.sub.10/I.sub.2, wherein I.sub.10 is measured according to ASTM D1238 (10 kg, 190 C.) of from 5.5 to 7.0; a molecular weight distribution (Mw/Mn) of from 2.2 to 3.5; and a vinyl unsaturation of greater than 0.12 vinyls per one thousand carbon atoms present in the backbone of the composition.

Disclosed herein is a cast film comprising a polyethylene composition comprising the reaction product of ethylene and optionally one or more alpha-olefin comonomers, wherein said polyethylene composition is characterized by the following properties: a melt index, I2, measured according to ASTM D1238 (2.16 kg, 190 C.), of from 1 to 20 g/10 min; a density (measured according to ASTM D792) of from 0.935 to 0.970 g/cm3; a melt flow ratio, I.sub.10/I.sub.2, wherein I.sub.10 is measured according to ASTM D1238 (10 kg, 190 C.) of from 5.5 to 7.0; a molecular weight distribution (Mw/Mn) of from 2.2 to 3.5; and a vinyl unsaturation of greater than 0.12 vinyls per one thousand carbon atoms present in the backbone of the composition.