Embodiments of methods for producing a trimodal polymer in a solution polymerization process comprise three solution polymerization reactors organized in parallel or in series.

Embodiments of methods for producing a trimodal polymer in a solution polymerization process comprise three solution polymerization reactors organized in parallel or in series.

Embodiments are directed towards polyolefin compositions including a high molecular weight polyolefin and a low molecular weight polyolefin.

Embodiments are directed towards polyolefin compositions including a high molecular weight polyolefin and a low molecular weight polyolefin.

Embodiments of polyethylene formulations and articles comprising polyethylene formulations are disclosed. The polyethylene formulation may include from 45 wt. % to 90 wt. % of an MDPE having a density of from 0.930 g/cc to 0.950 g/cc and a melt index (I.sub.2) from 0.05 g/10 min to 0.5 g/10 min; from 10 wt. % to 50 wt. % of a polyethylene composition having a density from 0.910 g/cc to 0.936 g/cc and a melt index (I.sub.2) from 0.7 g/10 min to 1.0 g/10 min; and from 0.5 wt. % to 5% of a masterbatch composition. The polyethylene composition may comprise a first polyethylene fraction area in a temperature range of 45° C. to 87° C. of an elution profile via improved comonomer composition distribution (iCCD) analysis method and a second polyethylene fraction area in a temperature range of 95° C. to 120° C. of an elution profile via iCCD.

Embodiments of polyethylene formulations and articles comprising polyethylene formulations are disclosed. The polyethylene formulation may include from 45 wt. % to 90 wt. % of an MDPE having a density of from 0.930 g/cc to 0.950 g/cc and a melt index (I.sub.2) from 0.05 g/10 min to 0.5 g/10 min; from 10 wt. % to 50 wt. % of a polyethylene composition having a density from 0.910 g/cc to 0.936 g/cc and a melt index (I.sub.2) from 0.7 g/10 min to 1.0 g/10 min; and from 0.5 wt. % to 5% of a masterbatch composition. The polyethylene composition may comprise a first polyethylene fraction area in a temperature range of 45° C. to 87° C. of an elution profile via improved comonomer composition distribution (iCCD) analysis method and a second polyethylene fraction area in a temperature range of 95° C. to 120° C. of an elution profile via iCCD.

The heterogeneous procatalyst of this disclosure includes a titanium species; a hydrocarbon soluble transition metal compound having a structure M(OR.sup.1).sub.z; a chlorinating agent having a structure A(Cl).sub.x(R.sup.2).sub.3-x, and a magnesium chloride component. M of M(OR.sup.1).sub.z is a non-reducing transition metal other than titanium, the non-reducing transition metal being in an oxidation state of +2 or +3. Each R.sup.1 is independently (C.sub.1-C.sub.30)hydrocarbyl or —C(O)R.sup.11, where R.sup.11 is (C.sub.1-C.sub.30)hydrocarbyl. Subscript z of M(OR.sup.1).sub.z is 2 or 3. Each R.sup.1 and R.sup.11 may be optionally substituted with one or more than one halogen atoms, or one or more than one —Si(R.sup.S).sub.3, where each R.sup.S is (C.sub.1-C.sub.30)hydrocarbyl. A of A(Cl).sub.x(R.sup.2).sub.3-x is aluminum or boron; R.sup.2 is (C.sub.1-C.sub.30)hydrocarbyl; and x is 1, 2, or 3; and a magnesium chloride component.

The heterogeneous procatalyst of this disclosure includes a titanium species; a hydrocarbon soluble transition metal compound having a structure M(OR.sup.1).sub.z; a chlorinating agent having a structure A(Cl).sub.x(R.sup.2).sub.3-x, and a magnesium chloride component. M of M(OR.sup.1).sub.z is a non-reducing transition metal other than titanium, the non-reducing transition metal being in an oxidation state of +2 or +3. Each R.sup.1 is independently (C.sub.1-C.sub.30)hydrocarbyl or —C(O)R.sup.11, where R.sup.11 is (C.sub.1-C.sub.30)hydrocarbyl. Subscript z of M(OR.sup.1).sub.z is 2 or 3. Each R.sup.1 and R.sup.11 may be optionally substituted with one or more than one halogen atoms, or one or more than one —Si(R.sup.S).sub.3, where each R.sup.S is (C.sub.1-C.sub.30)hydrocarbyl. A of A(Cl).sub.x(R.sup.2).sub.3-x is aluminum or boron; R.sup.2 is (C.sub.1-C.sub.30)hydrocarbyl; and x is 1, 2, or 3; and a magnesium chloride component.

The catalyst system includes a heterogeneous procatalyst, an electron donor, and a hydrogenation procatalyst. The heterogeneous procatalyst includes a titanium species, an aluminum species, and a magnesium chloride component. The hydrogenation procatalyst has the formula Cp.sub.2TiX.sub.nTiCp.sub.2 or Cp.sub.2TiX.sub.n. In formula Cp.sub.2TiX.sub.n, each Cp is a cyclopentadienyl substituted with at least one R.sup.1, wherein R.sup.1 is (C.sub.1-C.sub.10)alkyl; and each X is independently monoanionic or neutral, wherein each X is independently (C.sub.1-C.sub.40)hydrocarbon, (C.sub.1-C.sub.40)heterohydrocarbon, (C.sub.1-C.sub.40)hydrocarbyl, (C.sub.1—C.sub.40)heterohydrocarbyl, or a halogen atom.

The catalyst system includes a heterogeneous procatalyst, an electron donor, and a hydrogenation procatalyst. The heterogeneous procatalyst includes a titanium species, an aluminum species, and a magnesium chloride component. The hydrogenation procatalyst has the formula Cp.sub.2TiX.sub.nTiCp.sub.2 or Cp.sub.2TiX.sub.n. In formula Cp.sub.2TiX.sub.n, each Cp is a cyclopentadienyl substituted with at least one R.sup.1, wherein R.sup.1 is (C.sub.1-C.sub.10)alkyl; and each X is independently monoanionic or neutral, wherein each X is independently (C.sub.1-C.sub.40)hydrocarbon, (C.sub.1-C.sub.40)heterohydrocarbon, (C.sub.1-C.sub.40)hydrocarbyl, (C.sub.1—C.sub.40)heterohydrocarbyl, or a halogen atom.