The present disclosure relates to a polyethylene composition capable of producing a molded product having excellent environmental stress crack resistance, and improving total volatile organic compound (TVOC) properties that can be generated by a low molecular weight polymer, and a method for preparing the same.

The present disclosure relates to an ethylene/1-hexene copolymer having excellent flexibility and processability and useful for manufacturing high-pressure heating pipes, PE-RT pipes or large-diameter pipes.

The present disclosure relates to an ethylene/1-hexene copolymer having excellent flexibility and processability and useful for manufacturing high-pressure heating pipes, PE-RT pipes or large-diameter pipes.

A heterophasic propylene ethylene copolymer composition having an MFR.sub.2 in the range from 1.0 to 55.0 g/10 min and a melting temperature in the range from 155 to 162° C., comprising: i) from 60 to 88 wt.-% of a xylene cold insoluble fraction (XCI) having an intrinsic viscosity iV(XCI) in the range from 1.40 to 2.50 dl/g, an isotactic pentad concentration [mmmm] of more than 97.0% and a content of 2,1-regiodefects in the range from 0.1 to 0.4 mol %, ii) from 12 to 40 wt.-% of a xylene cold soluble fraction (XCS) having an intrinsic viscosity iV(XCS) in the range from 1.80 to 3.20 dl/g and an ethylene content C2(XCS) in the range from 25 to 80 wt.-%, wherein the ratio of the intrinsic viscosities of the two fractions, iV(XCS)/iV(XCI), is in the range from 1.0 to 2.0.

A heterophasic propylene ethylene copolymer composition having an MFR.sub.2 in the range from 1.0 to 55.0 g/10 min and a melting temperature in the range from 155 to 162° C., comprising: i) from 60 to 88 wt.-% of a xylene cold insoluble fraction (XCI) having an intrinsic viscosity iV(XCI) in the range from 1.40 to 2.50 dl/g, an isotactic pentad concentration [mmmm] of more than 97.0% and a content of 2,1-regiodefects in the range from 0.1 to 0.4 mol %, ii) from 12 to 40 wt.-% of a xylene cold soluble fraction (XCS) having an intrinsic viscosity iV(XCS) in the range from 1.80 to 3.20 dl/g and an ethylene content C2(XCS) in the range from 25 to 80 wt.-%, wherein the ratio of the intrinsic viscosities of the two fractions, iV(XCS)/iV(XCI), is in the range from 1.0 to 2.0.

A process for the continuous solution polymerization including the step of polymerizing a first olefin monomer of formula CH.sub.2═CHR.sup.1, wherein R.sup.1 is hydrogen or a hydrocarbon radical having from 1 to 8 carbon atoms with a second olefin monomer of formula CH.sub.2═CHR.sup.2, wherein R.sup.2 is a hydrocarbon radical having from 3 to 8 carbon atoms, in the presence of a polymerization catalyst and in the absence of an inert solvent, at a polymerization temperature (Tp) satisfying the following relationship:

Tp≥Tm+20° C.

wherein Tm is the melting temperature of the obtained polymer.

A process for the continuous solution polymerization including the step of polymerizing a first olefin monomer of formula CH.sub.2═CHR.sup.1, wherein R.sup.1 is hydrogen or a hydrocarbon radical having from 1 to 8 carbon atoms with a second olefin monomer of formula CH.sub.2═CHR.sup.2, wherein R.sup.2 is a hydrocarbon radical having from 3 to 8 carbon atoms, in the presence of a polymerization catalyst and in the absence of an inert solvent, at a polymerization temperature (Tp) satisfying the following relationship:

Tp≥Tm+20° C.

wherein Tm is the melting temperature of the obtained polymer.

An interpolymer product comprising: a first ethylene interpolymer comprising ethylene and an α-olefin having a weight-average molecular weight (M.sub.w) of greater than 250,000 and a density of less than 0.930 g/cm.sup.3, and a second ethylene interpolymer comprising ethylene and an α-olefin wherein the second ethylene interpolymer comprises a M.sub.w of less than 70,000 and a density of greater than 0.930 g/cm.sup.3; and wherein the interpolymer product comprises an environmental stress crack resistance (ESCR), measured according to ASTM D1693, Condition B, 10% IGEPAL CO-630, of greater than 90 hours. The interpolymer product may be manufactured in a continuous solution polymerization process utilizing at least two reactors employing at least one single site catalyst formulation and at least one heterogeneous catalyst formulation.

An interpolymer product comprising: a first ethylene interpolymer comprising ethylene and an α-olefin having a weight-average molecular weight (M.sub.w) of greater than 250,000 and a density of less than 0.930 g/cm.sup.3, and a second ethylene interpolymer comprising ethylene and an α-olefin wherein the second ethylene interpolymer comprises a M.sub.w of less than 70,000 and a density of greater than 0.930 g/cm.sup.3; and wherein the interpolymer product comprises an environmental stress crack resistance (ESCR), measured according to ASTM D1693, Condition B, 10% IGEPAL CO-630, of greater than 90 hours. The interpolymer product may be manufactured in a continuous solution polymerization process utilizing at least two reactors employing at least one single site catalyst formulation and at least one heterogeneous catalyst formulation.

Embodiments of the present disclosure directed towards titanium biphenylphenol polymerization precatalysts of Formula (I).