The invention is directed to a supported olefin polymerization catalyst system comprising catalyst compound, silica support and alumoxane activator, where part of the alumoxane is present on the support and part of the alumoxane is not associated with the support, wherein the silica comprises silica particles having an average surface area of greater than about 400 m.sup.2/g, an average pore diameter of less than about 70 Angstroms, and wherein alumoxane is present on the support in an amount of less than 7 mmol Al/g silica and at least 1 wt % of alumoxane particles not associated with the support are present in the catalyst system, based upon the weight of the catalyst system.

Disclosed herein are ethylene-based polymers generally characterized by a Mw ranging from 70,000 to 200,000 g/mol, a ratio of Mz/Mw ranging from 1.8 to 20, an IB parameter ranging from 0.92 to 1.05, and an ATREF profile characterized by one large peak. These polymers have the dart impact, tear strength, and optical properties of a metallocene-catalyzed LLDPE, but with improved processability, melt strength, and bubble stability, and can be used in blown film and other end-use applications.

The present invention provides a metallocene complex capable of producing a homopolypropylene having a high melting point in the homopolymerization of propylene, and a production method of an olefin polymer using the same. The metallocene complex of the present invention is represented by formula [I].

This invention relates to a process to produce propylene polymer using a bridged hafnium transition metal metallocene catalyst compounds having two indenyl ligands substituted at the 4 positions with a C.sub.1 to C.sub.10 alkyl, where the 3 positions are hydrogen (assuming the bridge position is counted as the one position) and the bridging atom is carbon or silicon which is incorporated into a cyclic group comprising 3, 4, 5, or 6 silicon and/or carbon atoms that make up the cyclic ring, where the propylene polymer has 1) greater than 40% vinyl chain ends, relative to the total unsaturated chain ends, 2) a Tm of 70 C. or more; an Mw of 3000 to 300,000 g/mol, and 4) a g.sub.vis of 0.90 or less.

The purpose of the present invention is to provide a method for efficiently producing an olefin (co)polymer containing a constituent unit derived from 1-butene, the (co)polymer having a molecular weight that is sufficiently high even for high temperature conditions that are beneficial for industrial production methods. This purpose can be achieved by means of a method for producing an olefin (co)polymer containing a constituent unit derived from 1-butene, wherein at least 1-butene and, if necessary, an -olefin having 2 or more carbon atoms (excluding 1-butene) and other monomers are (co)polymerized in the presence of an olefin polymerization catalyst that contains (A) a crosslinked metallocene compound represented by general formula [I] and (B) at least one type of compound selected from among (b-1) an organic aluminum oxy compound, (b-2) a compound that forms an ion pair upon a reaction with the crosslinked metallocene compound (A), and (b-3) an organic aluminum compound, at a polymerization temperature of 55-200 C. and a polymerization pressure of 0.1-5.0 MPaG.

This invention relates to novel bridged a hafnium transition metal metallocene catalyst compounds having two indenyl ligands substituted at the 4 position, preferably 4 and 7 positions, with a C.sub.1 to C.sub.10 alkyl, where the 2 and 3 positions are hydrogen (assuming the bridge position is counted as the one position) and the bridging atom is carbon or silicon which is incorporated into a cyclic group comprising 3, 4, 5, or 6 silicon and/or carbon atoms that make up the cyclic ring.

A process for the preparation of ethylene -olefin copolymers by copolymerizing ethylene with -olefins in the presence of a catalyst formed by contacting a metallocene complex with a cocatalyst, wherein the metallocene complex is a metallocene complex according to formula I or a metallocene complex according to formula II, ##STR00001##
wherein M is chosen from the group of Ti, Zr and Hf; Q is halogen (F, Cl, Br, I) or an alkyl group comprising 1 to 20 carbon atoms; k is the number of Q groups, is an integer and equals the valence of M minus 2; and wherein R.sup.1, R.sup.2, R.sup.3 and R.sup.4 are identical or different and can be chosen from alkyl groups with 1-20 carbon atoms.

A monophasic bimodal propylene/ethylene/1-butene random terpolymer composition (PP) comprising: a) 40 to 90 wt.-% of a first random terpolymer fraction (PP1), having a C2 content in the range from 0.3 to 3.0 mol-%, and a C4 content in the range from 1.0 to 5.0 mol-%; and b) 10 to 60 wt.-% of a second random terpolymer fraction (PP2), having a C2 content in the range from 3.0 to 7.0 mol-%, and a C4 content in the range from 2.0 to 6.0 mol-%, having: i) a C2 content in the range from 1.0 to 4.0 mol-%; ii) a C4 content in the range from 1.5 to 4.5 mol-%; iii) an MFR2 in the range from 3.0 to 10 g/10 min; and iv) a content of 2,1-regiodefects in the range from 0.1 to 1.5 mol %.

This invention relates to catalyst supports having high surface area (SA400 m.sup.2/g), low pore volume (PV2 mL/g), a specific mean pore diameter range (PD=1-20 nm), and high average particle size (PS30 m), supported catalysts, and supportation processes; and further relates to: high porosity (15%) and/or low pore diameter (PD<165 m) propylene polymers; bimodal polymers and/or heterophasic copolymers based on the high porosity and/or low pore diameter propylene polymers; propylene polymerization processes using the supported catalysts and/or to prepare the high porosity and/or low pore diameter propylene polymers, bimodal polymers and/or heterophasic copolymers.

This invention relates to a novel group 2, 3 or 4 transition metal metallocene catalyst compound having at least one arenyl ligand substituted with: 1) a cyclopropyl group and, optionally, 2) at at least one other group, such as a hydrocarbyl, a heteroatom or a heteroatom containing group.