A bimodal ethylene-co-1-hexene copolymer composition consisting of a higher molecular weight component and a lower molecular weight component and, when in melted form at 190 degrees Celsius, is characterized by a melt property performance defined by a combination of melt index (5 kg), melt strength, and, optionally, shear thinning properties, and, when in solid form, is characterized by a slow crack growth property performance defined by a combination of strain hardening modulus and accelerated full-notch creep test performance. A pipe consisting of the bimodal ethylene-co-1-hexene copolymer composition. A method of synthesizing the bimodal ethylene-co-1-hexene copolymer composition. A method of making the pipe. A manufactured article, which is not a pipe, comprising the bimodal ethylene-co-1-hexene copolymer composition.

A bimodal ethylene-co-1-hexene copolymer composition consisting of a higher molecular weight component and a lower molecular weight component and, when in melted form at 190 degrees Celsius, is characterized by a melt property performance defined by a combination of melt index (5 kg), melt strength, and, optionally, shear thinning properties, and, when in solid form, is characterized by a slow crack growth property performance defined by a combination of strain hardening modulus and accelerated full-notch creep test performance. A pipe consisting of the bimodal ethylene-co-1-hexene copolymer composition. A method of synthesizing the bimodal ethylene-co-1-hexene copolymer composition. A method of making the pipe. A manufactured article, which is not a pipe, comprising the bimodal ethylene-co-1-hexene copolymer composition.

What is disclosed is a Ziegler-Natta catalyzed ethylene and alpha-olefin LLDPE copolymer having a unique composition distribution and long chain-branching. The polymers of the present invention inherently exhibit outstanding melt strength with great bubble stability, sufficient flexibility, excellent gel performance, as well as desirable mechanical properties such as balanced toughness and stiffness, which are desirable properties for thick gauge film applications. Specifically, the polymers of the present invention.

What is disclosed is a Ziegler-Natta catalyzed ethylene and alpha-olefin LLDPE copolymer having a unique composition distribution and long chain-branching. The polymers of the present invention inherently exhibit outstanding melt strength with great bubble stability, sufficient flexibility, excellent gel performance, as well as desirable mechanical properties such as balanced toughness and stiffness, which are desirable properties for thick gauge film applications. Specifically, the polymers of the present invention.

A method for increasing the melt strength of a polyolefin polymer composition is provided. The method includes mixing a first polyolefin composition derived from at least one olefin polymerization catalyst (a) and at least one olefin polymerization catalyst (b) with a second polyolefin composition derived from the at least one olefin polymerization catalyst (b) or from at least one olefin polymerization catalyst (c), and obtaining the polyolefin polymer composition.

A method for increasing the melt strength of a polyolefin polymer composition is provided. The method includes mixing a first polyolefin composition derived from at least one olefin polymerization catalyst (a) and at least one olefin polymerization catalyst (b) with a second polyolefin composition derived from the at least one olefin polymerization catalyst (b) or from at least one olefin polymerization catalyst (c), and obtaining the polyolefin polymer composition.

The present invention relates to polyolefin. More specifically, the present invention relate s to polyolefin having excellent dart drop impact strength, and exhibiting improved transparency and satisfying one of the following 1)˜4): 1) when density is 0.9165 g/cm.sup.3 or more and less than 0.9175 g/cm.sup.3, the content of SCB (Short Chain Branch) is 9.5 to 10.5 wt %, 2) when density is 0.9175 g/cm.sup.3 or more and less than 0.9185 g/cm.sup.3, the content of SCB (Short Chain Branch) is 9.0 to 10.0 wt %, 3) when density is 0.9185 g/cm.sup.3 or more and less than 0.9195 g/cm.sup.3, the content of SCB (Short Chain Branch) is 8.5 to 9.5 wt %, 4) when density is 0.9195 g/cm.sup.3 or more and less than 0.9205 g/cm.sup.3, the content of SCB (Short Chain Branch) is 7.5 to 8.5 wt %, wherein the density is measured according to ASTM D1505.

The present invention relates to polyolefin. More specifically, the present invention relate s to polyolefin having excellent dart drop impact strength, and exhibiting improved transparency and satisfying one of the following 1)˜4): 1) when density is 0.9165 g/cm.sup.3 or more and less than 0.9175 g/cm.sup.3, the content of SCB (Short Chain Branch) is 9.5 to 10.5 wt %, 2) when density is 0.9175 g/cm.sup.3 or more and less than 0.9185 g/cm.sup.3, the content of SCB (Short Chain Branch) is 9.0 to 10.0 wt %, 3) when density is 0.9185 g/cm.sup.3 or more and less than 0.9195 g/cm.sup.3, the content of SCB (Short Chain Branch) is 8.5 to 9.5 wt %, 4) when density is 0.9195 g/cm.sup.3 or more and less than 0.9205 g/cm.sup.3, the content of SCB (Short Chain Branch) is 7.5 to 8.5 wt %, wherein the density is measured according to ASTM D1505.

Phosphine phosphonate and phenoxyphosphine ligands bearing polyethylene glycol (PEG) chains are used as described herein to produce heterobimetallic catalysts. The ligands can be metallated selectively with palladium or nickel and secondary metal ions to provide well-defined heterobimetallic compounds. These heterobimetallic complexes exhibit accelerated reaction rates and greater thermal stability in olefin polymerization compared to other catalysts.

Phosphine phosphonate and phenoxyphosphine ligands bearing polyethylene glycol (PEG) chains are used as described herein to produce heterobimetallic catalysts. The ligands can be metallated selectively with palladium or nickel and secondary metal ions to provide well-defined heterobimetallic compounds. These heterobimetallic complexes exhibit accelerated reaction rates and greater thermal stability in olefin polymerization compared to other catalysts.