A polyolefin composition made from or containing: A) from 19 wt % to 50 wt % of a propylene ethylene copolymer having an ethylene derived units content ranging from 1.5 wt % to 6.0 wt; B) from 50 wt % to 81 wt % of a propylene ethylene 1-butene terpolymer having an ethylene derived units content ranging from 1.5 wt % and 6.0 wt % and 1-butene derived units content of between 4.8 wt % and 12.4 wt %;
wherein the ratio C2 wt %/C4 wt % is between 0.22 and 3.0, where C2 wt % is the weight percent of ethylene derived units and C4 wt % is the weight percent of 1-butene derived units; the content of xylene soluble fraction at 25? C. is between 2 and 15 wt %; molecular weight distribution (MWD), expressed in terms of Mw/Mn, greater than 4.0; recoverable compliance at 200? C. having a maximum value between 800 and 1200 seconds, lower than 65?10.sup.?5 Pa.sup.?1.

A process may include contacting ethylene monomer with Ziegler-Natta catalyst to form polyethylene. The Ziegler-Natta catalyst may be formed by contacting an alkyl magnesium compound with an alcohol and a metal reagent to form a blend, and contacting the blend with a first agent to form a solution of reaction product A. The solution of reaction product A may be contacted with a second agent to form a solid reaction product B, and the solid reaction product B may be contacted with a third agent to form a solid reaction product C. The solid reaction product C may be contacted with a fourth agent to form a solid reaction product D, and the solid reaction product D may be contacted with a fifth agent to form a catalyst component.

A solid catalyst component for the (co)polymerization of olefins CH.sub.2CHR, in which R is a hydrocarbyl radical with 1-12 carbon atoms, optionally in mixture with ethylene, comprising Ti, Mg, Cu, Cl, and an electron donor compound characterized by the fact that the Cu/Ti weight ratio is lower than 0.5.

The invention relates to the technical field of heterogeneous catalytic olefin polymerization, and discloses a polyolefin catalyst, its preparation and its us. A method for preparing the polyolefin catalyst comprises: (i) providing a thermally activated mesoporous material, with the thermal activation treatment being performed at a temperature of 300 to 900 C. for a period of time of 3 to 48 hours; (ii) under an inert atmosphere, (iia) conducting impregnation treatment of the thermally activated mesoporous material with a solution containing a magnesium component and then with a solution containing a titanium component, (iib) conducting impregnation treatment of the thermally activated mesoporous material with a solution containing a titanium component and then with a solution containing a magnesium component, or (iic) conducting co-impregnation treatment of the thermally activated mesoporous material with a solution containing both a titanium component and a magnesium component, to obtain a slurry to be sprayed; and (iii) spray drying the slurry to be sprayed from step (ii), to obtain a solid polyolefin catalyst component. When used in olefin polymerization, the polyolefin catalysts prepared by using the method provided by the invention have high catalytic activities, and polyolefin products having a narrow molecular weight distribution and an excellent melt index can be obtained.

This disclosure relates to ethylene interpolymer product having intermediate branching. Intermediate branching was defined as branching that was longer than the branch length due to comonomer and shorter than the entanglement molecular weight (M.sub.e). Intermediately branched ethylene interpolymer products were produced in a continuous solution polymerization process employing an intermediate branching catalyst formulation. Intermediately branched ethylene interpolymer products were characterized by a Non-Comonomer Index Distribution (NCID.sub.i), a melt index from 0.3 to 500 dg/minute, a density from 0.858 to 0.965 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 25 and a CDBI.sub.50 from about 10% to about 98%. A method based on triple detection cross fractionation chromatography (3D-CFC) was disclosed to measure NCID.sub.i.

This disclosure relates to ethylene interpolymer product having intermediate branching. Intermediate branching was defined as branching that was longer than the branch length due to comonomer and shorter than the entanglement molecular weight (M.sub.e). Intermediately branched ethylene interpolymer products were produced in a continuous solution polymerization process employing an intermediate branching catalyst formulation. Intermediately branched ethylene interpolymer products were characterized by a Non-Comonomer Index Distribution (NCID.sub.i), a melt index from 0.3 to 500 dg/minute, a density from 0.858 to 0.965 g/cm.sup.3, a polydispersity (M.sub.w/M.sub.n) from about 2 to about 25 and a CDBI.sub.50 from about 10% to about 98%. A method based on triple detection cross fractionation chromatography (3D-CFC) was disclosed to measure NCID.sub.i.

The present disclosure relates to a catalyst composition and a process for preparation thereof. The catalyst composition of the present disclosure is stable, and produces polyolefin having narrow molecular weight distribution during the polymerization. The process of the present disclosure is simple, cost-effective, and rapid.

A polyethylene powder satisfying (Requirements 1 to 3): (Requirement 1): viscosity-average molecular weight (Mv) is 200,000 or more and 3,000,000 or less (Requirement 2): complex viscosity |*|.sub.m obtained by measurement under predetermined <Conditions for Measurement of Slurry Viscoelasticity> satisfies the following formula (1):
590.0(Mv10.sup.4).sup.1.18|*|.sub.m13.3(Mv10.sup.4).sup.1.18(1) (Requirement 3): a value of any peak when d(log|*|)/dT is plotted against temperature is 1.0 or more and 3.0 or less.

A polyethylene powder satisfying (Requirements 1 to 3): (Requirement 1): viscosity-average molecular weight (Mv) is 200,000 or more and 3,000,000 or less (Requirement 2): complex viscosity |*|.sub.m obtained by measurement under predetermined <Conditions for Measurement of Slurry Viscoelasticity> satisfies the following formula (1):
590.0(Mv10.sup.4).sup.1.18|*|.sub.m13.3(Mv10.sup.4).sup.1.18(1) (Requirement 3): a value of any peak when d(log|*|)/dT is plotted against temperature is 1.0 or more and 3.0 or less.

The present invention relates to a method for producing an ultra-high molecular weight polypropylene having a viscosity average molecular weight of 1,000,000 g/mol or greater and a low inorganic content of 30 ppm or less. According to the method for producing an ultra-high molecular weight polypropylene of the above disclosure, there is the effect that the molecular weight control for producing an ultra-high molecular weight propylene can be achieved with an input ratio of a main catalyst, a co-catalyst and a promoter even if hydrogen used as a molecular weight regulator in general polymerization conditions is not added.