Processes of polymerizing olefin monomers. The process includes reacting ethylene and optionally one or more olefin monomers in the presence of a catalyst system, wherein the catalyst system comprises: hydrocarbyl-modified methylaluminoxane having less than 25 mole percent trihydrocarbyl aluminum compounds AlR.sup.A1R.sup.B1R.sup.C1 based on the total moles of aluminum, where R.sup.A1, R.sup.B1, and R.sup.C1 are independently linear (C.sub.1-C.sub.40)alkyl, branched (C.sub.1-C.sub.40)alkyl, or (C.sub.6-C.sub.40)aryl; and one or more procatalysts comprising a metal-ligand complex according to formula (I): (Formula (I)).

##STR00001##

The present disclosure provides a hybrid supported metallocene catalyst useful for preparing a polyethylene copolymer capable of producing an mLLDPE shrink film having excellent shrinkage and processability with excellent mechanical properties, and a process for preparing a polyethylene copolymer using the same. The hybrid supported metallocene catalyst comprises at least one first metallocene compound selected from compounds represented by the following Chemical Formula 1 and at least one second metallocene compound selected from compounds represented by the following Chemical Formula 2:

##STR00001## wherein the variables are described herein.

Provided are a novel transition metal compound based on a cyclopenta[a]naphthalene group, a transition metal catalyst composition having high catalytic activity for preparing an ethylene homopolymer or a copolymer of ethylene and at least one α-olefin including the same, a method for preparing an ethylene homopolymer or a copolymer of ethylene and α-olefin using the same, and the ethylene homopolymer or the copolymer of ethylene and α-olefin prepared above. The metallocene compound according to the present invention and the catalyst composition including the same may provide a high thermal stability of the catalyst to maintain high catalytic activity even at a high temperature, have good copolymerization reactivity with other olefins, and prepare a high molecular weight polymer at a high yield.

The present invention relates to an olefin-based polymer, which has (1) a density (d) ranging from 0.850 g/cc to 0.865 g/cc, (2) a melt index (MI, 190° C., 2.16 kg load conditions) ranging from 0.1 g/10 min to 3.0 g/10 min, (3) a melt temperature (Tm) of 10° C. to 100° C., and (4) a hardness (H, Shore A), the density (d) and the melt temperature (Tm) satisfying Equation 1, and Equation 2 or 3. The olefin-based polymer according to the present invention has low hardness and improved foaming properties, and exhibits improved impact strength at compounding.

An interpolymer, which comprises at least one siloxane group, and prepared by polymerizing a mixture comprising one or more “addition polymerizable monomers” and at least one siloxane monomer, in the presence of a catalyst system comprising a Group 3-10 metal complex, and the siloxane monomer is selected from the following Formula 1: A.sub.a-Si(B.sub.b)(C.sub.c)(H.sub.h0)—O—(Si(D.sub.d)(E.sub.e) (H.sub.h1)—O).sub.x—Si(F.sub.f)(G.sub.g)(H.sub.h2), described herein. An ethylene/siloxane interpolymer comprising at least one chemical unit of Structure 1, or at least one chemical unit of Structure 2, each described herein. A process to form an interpolymer, which comprises, in polymerized form, at least one siloxane monomer, or at least one silane monomer without a siloxane linkage, said process comprising polymerizing a mixture comprising one or more “addition polymerizable monomers” and at least one monomer of Formula 4, described herein, in the presence of a catalyst system comprising a metal complex from Formula A or Formula B, each described herein.

A propylene-α-olefin-diene (PEDM) terpolymer may comprise 75 to 95 wt % propylene, 5 to 20 wt % α-olefin, and 0.5 to 5 wt % diene, said wt % based on the weight of the PEDM terpolymer. The propylene-α-olefin-diene terpolymer may be blended with an ethylene-based copolymer and optionally a variety of additives to form an elastomeric composition. An exemplary elastomeric composition includes 5 to 40 parts by weight per hundred parts by weight rubber (phr) of the PEDM terpolymer, 60 to 95 phr of the ethylene-based copolymer, and optionally additives like carbon black, zinc dimethacrylate, paraffinic oil, zinc oxide, and/or zinc stearate.

An olefin-based copolymer and method of making the same are disclosed herein. In some embodiments, the olefin-based copolymer includes a repeating unit derived from an alpha-olefin, wherein the alphas-olefin is present in the copolymer at 15 wt % to 45 wt %, wherein the copolymer has a density (d) of 0.85 to 0.89 g/cc, a melt index (MI), measured at 190° C. and 2.16 kg load, of 15 g/10 min to 100 g/10 min, and a hardness defined by Equation 1. The olefin-based copolymer has improved hardness and is highly flowable, and may show improved physical properties of tensile strength, elongation rate and flexural modulus.

Low molecular weight, highly branched polyolefins are provided. Also provided are catalyst-mediated methods of making the low molecular weight, highly branched polyolefins and a catalyst system for carrying out the methods. The catalyst system is a homogeneous catalytic system that includes a single-site organozirconium complex and hydrocarbon-soluble perfluoroarylborate co-catalyst that is highly active for the oligomerization of olefin monomers in non-polar media.

The present invention provides an adhesive composition including an ethylene/alpha-olefin copolymer; and a tackifier, wherein the ethylene/alpha-olefin copolymer has narrow molecular weight distribution together with a low density and an ultra low molecular weight, minimized number of unsaturated functional groups, and particularly a small amount of vinylidene among the unsaturated functional groups, thereby showing excellent physical properties.

The present disclosure provides a catalyst system comprising the product of a catalyst compound capable of making crystalline material (such as isotactic PP) and a second catalyst compound capable of making non-diene-containing-amorphous material and diene-containing-elastomeric material. The catalyst system of the present disclosure may further comprise a support material (or product thereof) having one or more of: a surface area of from 400 m.sup.2/g to 800 m.sup.2/g; an average pore diameter of 90 Angstroms or greater; an average particle size of 60 μm or greater; 40% or greater of the incremental pore volume comprising pores having a pore diameter larger than 100 Angstroms or greater; and sub-particles having an average particle size in the range of 0.01 μm to 5 μm. In another embodiment, a propylene polymer composition includes: isotactic polypropylene; 5 wt % or greater of atactic polypropylene, based on the weight of the composition; and an ethylene-propylene-diene terpolymer. The present disclosure further provides methods for forming propylene polymer compositions.