Ethylene-based polymers comprise reaction products of polymerizing ethylene monomer, at least one diene or polyene comonomer, and optionally at least one C.sub.3 to C.sub.14 comonomer under defined polymerization reaction conditions, the ethylene-based polymer having: an M.sub.w/M.sub.w0 greater than 1.20. The M.sub.w0 is the initial weight-average molecular weight of a comparative ethylene-based polymer by gel permeation chromatography. The comparative ethylene-based polymer being a reaction product of polymerizing ethylene monomer and all C.sub.3 to C.sub.14 comonomers present in the ethylene-based polymer, if any, without the at least one polyene comonomer, under the defined polymerization reaction conditions; and a molecular weight tail quantified by an MWD area metric, A.sub.TAIL, and A.sub.TAIL is less than or equal to 0.04 as determined by gel permeation chromatography using a triple detector.

Ethylene-based polymers comprise reaction products of polymerizing ethylene monomer, at least one diene or polyene comonomer, and optionally at least one C.sub.3 to C.sub.14 comonomer under defined polymerization reaction conditions, the ethylene-based polymer having: an M.sub.w/M.sub.w0 greater than 1.20. The M.sub.w0 is the initial weight-average molecular weight of a comparative ethylene-based polymer by gel permeation chromatography. The comparative ethylene-based polymer being a reaction product of polymerizing ethylene monomer and all C.sub.3 to C.sub.14 comonomers present in the ethylene-based polymer, if any, without the at least one polyene comonomer, under the defined polymerization reaction conditions; and a molecular weight tail quantified by an MWD area metric, A.sub.TAIL, and A.sub.TAIL is less than or equal to 0.04 as determined by gel permeation chromatography using a triple detector.

The present disclosure provides bridged metallocene catalyst compounds comprising SiSi bridges, catalyst systems comprising such compounds, and uses thereof. Catalyst compounds of the present disclosure can be hafnium-containing compounds having one or more cyclopentadiene ligand(s) substituted with one or more silyl neopentyl groups and linked with an SiSi-containing bridge. In another class of embodiments, the present disclosure is directed to polymerization processes to produce polyolefin polymers from catalyst systems comprising one or more olefin polymerization catalysts, at least one activator, and an optional support.

The present disclosure provides bridged metallocene catalyst compounds comprising SiSi bridges, catalyst systems comprising such compounds, and uses thereof. Catalyst compounds of the present disclosure can be hafnium-containing compounds having one or more cyclopentadiene ligand(s) substituted with one or more silyl neopentyl groups and linked with an SiSi-containing bridge. In another class of embodiments, the present disclosure is directed to polymerization processes to produce polyolefin polymers from catalyst systems comprising one or more olefin polymerization catalysts, at least one activator, and an optional support.

A composition composed of at least a first ethylene/-olefin/nonconjugated polyene interpolymer, which can be used to produce low compression set, foamed rubber materials, articles made from the composition, and methods of producing the composition and articles.

A composition composed of at least a first ethylene/-olefin/nonconjugated polyene interpolymer, which can be used to produce low compression set, foamed rubber materials, articles made from the composition, and methods of producing the composition and articles.

The present invention relates to a branched modifier and a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g.sub.vis of 0.97 or more and an Mw of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a) a g.sub.vis of 0.70 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 4.0 or more; d) a shear thinning ratio of 110 or more, e) a melt strength of 10 cN or more; f) a complex viscosity at 0.1 rad/sec at 190 C. of at least 130,000 Pa.Math.s; and g) a phase angle of Z or less where Z=138.3G*.sup.(0.142), where G* is the complex modulus reported in Pascals measured at 190 C. and the phase angle units are reported in degrees, wherein the G* is from 1,000 to 1,000,000 Pa.

The present invention relates to a branched modifier and a composition comprising more than 25 wt % (based on the weight of the composition) of one or more linear ethylene polymers having a g.sub.vis of 0.97 or more and an Mw of 20,000 g/mol or more and at least 0.1 wt % of a branched modifier where the modifier has a) a g.sub.vis of 0.70 or less; b) an Mw of 100,000 g/mol or more; c) an Mw/Mn of 4.0 or more; d) a shear thinning ratio of 110 or more, e) a melt strength of 10 cN or more; f) a complex viscosity at 0.1 rad/sec at 190 C. of at least 130,000 Pa.Math.s; and g) a phase angle of Z or less where Z=138.3G*.sup.(0.142), where G* is the complex modulus reported in Pascals measured at 190 C. and the phase angle units are reported in degrees, wherein the G* is from 1,000 to 1,000,000 Pa.

Disclosed herein are mixed catalyst systems including iron-containing catalyst compounds having a carbene ligand and another catalyst compound, as well as at least one activator. The iron-containing catalyst compounds can be asymmetric, while the other catalyst compound can be symmetric. In some embodiments, the other catalyst compound can be an iron-containing catalyst with a bisiminopyridyl ligand, which does not typically incorporate comonomers in copolymer synthesis. Processes for production of an ethylene alpha-olefin copolymers using these mixed catalyst systems are also disclosed. Ethylene-alpha-olefin copolymers so formed can have at least a portion of their alpha-olefin comonomer distribution increasing with increasing molecular weight, indication orthogonal compositional distribution.

Disclosed herein are mixed catalyst systems including iron-containing catalyst compounds having a carbene ligand and another catalyst compound, as well as at least one activator. The iron-containing catalyst compounds can be asymmetric, while the other catalyst compound can be symmetric. In some embodiments, the other catalyst compound can be an iron-containing catalyst with a bisiminopyridyl ligand, which does not typically incorporate comonomers in copolymer synthesis. Processes for production of an ethylene alpha-olefin copolymers using these mixed catalyst systems are also disclosed. Ethylene-alpha-olefin copolymers so formed can have at least a portion of their alpha-olefin comonomer distribution increasing with increasing molecular weight, indication orthogonal compositional distribution.