Pellet-stable olefinic copolymer bimodal rubber is made using parallel reactors, with one reactor synthesizing higher molecular weight (MW) rubber with dual catalysts, with an improved molecular weight split ratio and an improved composition distribution of the moderate and ultra-high MW components, while another reactor synthesizes random isotactic polypropylene copolymer (RCP). The effluents are reactor-blended and result in pellet-stable bimodal rubber (P-SBR), which may be pelletized. When making thermoplastic vulcanizates (TPVs) with P-SBR, the need to granulate rubber bales and subsequently use talc, clay, or other anti-agglomeration agents to prevent granulated rubber crumbs from agglomerating are eliminated. TPVs made with P-SBR have vulcanized rubber particles that are smaller and more uniform in size, resulting in TPVs with higher particle counts and more thermoplastic “ligaments” between the particles, with such ligaments being made stronger by the added RCP. Such thus-produced TPVs have a lower hysteresis and flexural modulus, and better elastic properties.

Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.

Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.

Processes are provided which include copolymerization using one or both of a metallocene catalyst capable of producing high molecular weight polymers and a metallocene catalyst capable of producing polymers having 60% or more vinyl terminations. Polymerization processes include dual catalyst polymerization in a single polymerization zone comprising both metallocene catalysts. Other processes include serial or parallel polymerizations in multiple polymerization zones, using either or both catalysts in each polymerization zone. Such polymerization processes produce reactor blends, and are particularly suited for producing copolymer compositions (such as EP or EPDM copolymer compositions) exhibiting improved melt elasticity and rheological properties.

An ethylene alpha-olefin copolymer having (a) a density of from about 0.910 g/cc to about 0.940 g/cc; (b) a weight average molecular weight of from about 150,000 g/mol to about 300,000 g/mol; and (c) a melt index at a load of 2.16 kg of from about 0.01 dg/10 min. to about 0.5 dg/min.; wherein a 1 mil blown film formed from the polymer composition is characterized by (i) a Dart Impact strength greater than about 175 g/mil; (ii) an Elmendorf machine direction tear strength greater than about 20 g/mil; and (iii) an Elmendorf transverse direction tear strength greater than about 475 g/mil.

The present invention relates to an EPDM resin blend composition, which includes a first EPDM resin matrix and a second EPDM resin, wherein a ratio (M.sub.w1/M.sub.w2) of a weight average molecular weight of the first EPDM resin matrix to a weight average molecular weight of the second EPDM resin ranges from 0.75 to 1.33, and the second EPDM resin has a narrower molecular weight distribution (M.sub.w/M.sub.n) than the first EPDM resin matrix, and to a method for preparing the same.

The present invention relates to an EPDM resin blend composition, which includes a first EPDM resin matrix and a second EPDM resin, wherein a ratio (M.sub.w1/M.sub.w2) of a weight average molecular weight of the first EPDM resin matrix to a weight average molecular weight of the second EPDM resin ranges from 0.75 to 1.33, and the second EPDM resin has a narrower molecular weight distribution (M.sub.w/M.sub.n) than the first EPDM resin matrix, and to a method for preparing the same.

The present invention relates to an EPDM resin blend composition, which includes a first EPDM resin matrix and a second EPDM resin, wherein a ratio (M.sub.w1/M.sub.w2) of a weight average molecular weight of the first EPDM resin matrix to a weight average molecular weight of the second EPDM resin ranges from 0.75 to 1.33, and the second EPDM resin has a narrower molecular weight distribution (M.sub.w/M.sub.n) than the first EPDM resin matrix, and to a method for preparing the same.

Provided are a metal-ligand complex, a catalyst composition for ethylene-based polymerization including the same, and a method for preparing an ethylene-based polymer using the same. Since the metal-ligand complex of the present invention in which a certain functional group is introduced to a certain position has high solubility and catalytic activity, the catalyst composition comprising the same for ethylene-based polymerization including the same may produce an ethylene-based polymer having excellent physical properties.

A composition composed of at least a first ethylene/α-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.