Provided is a novel olefin polymer which is excellent in lightness and moldability, has high rigidity and yields molded products excellent in flexural elasticity. The olefin polymer includes a propylene initial polymerization product formed in the presence of an olefin polymerization catalyst which is a contact reaction product of an olefin polymerization solid catalyst component containing a titanium atom, a magnesium atom, a halogen atom and an internal electron donating compound, at least one organoaluminum compound selected from the compounds of the general formula (I), and a first external electron donating compound; and a polypropylene part formed of a propylene polymerization product formed in the presence of the olefin polymerization catalyst and a second external electron donating compound higher in adsorption to the surface of the olefin polymerization solid catalyst component than the first external electron donating compound.

Provided is a novel olefin polymer which is excellent in lightness and moldability, has high rigidity and yields molded products excellent in flexural elasticity. The olefin polymer includes a propylene initial polymerization product formed in the presence of an olefin polymerization catalyst which is a contact reaction product of an olefin polymerization solid catalyst component containing a titanium atom, a magnesium atom, a halogen atom and an internal electron donating compound, at least one organoaluminum compound selected from the compounds of the general formula (I), and a first external electron donating compound; and a polypropylene part formed of a propylene polymerization product formed in the presence of the olefin polymerization catalyst and a second external electron donating compound higher in adsorption to the surface of the olefin polymerization solid catalyst component than the first external electron donating compound.

This invention relates to production of propylene-predominant copolymers using a transition metal complex and at least two different non-coordinating anion activators. An olefinic feed comprising a C.sub.3-C.sub.40 alpha olefin, ethylene, and a diene monomer is contacted under polymerization reaction conditions with a catalyst system comprising a first non-coordinating anion activator, a second non-coordinating borate activator differing from the first non-coordinating anion activator, and a transition metal complex comprising a tetrahydro-s-indacenyl or tetrahydro-as-indacenyl group bound to a group 3-6 transition metal. A molar ratio of the first non-coordinating anion activator to the second non-coordinating anion activator is sufficient to produce a melt flow rate under the polymerization reaction conditions for the resulting copolymer of about 30 g/10 min or below as determined by ASTM D-1238 (230 C., 2.16 kg).

The present invention provides an ethylene/alpha-olefin copolymer having 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 to show excellent physical properties, and a method for preparing the same.

The present disclosure provides methods for producing an olefin polymer by contacting a C.sub.3-C.sub.40 olefin, ethylene and a diene with a catalyst system including an activator and a metallocene catalyst compound comprising a substituted or unsubstituted indacenyl group and obtaining a C.sub.3-C.sub.40 olefin-ethylene-diene terpolymer typically comprising from 30 to 55 mol % ethylene, from 69.09 to 45 mol % C.sub.3 to C.sub.40 comonomer, and from 0.01 to 7 mol % diene wherein the Tg of the terpolymer is 28 C. or less. Preferably, a propylene-ethylene-ethylidene norbornene is obtained.

A method for altering the melt flow ratio (MFR) of ethylene copolymers made in a gas phase reactor using a supported Ziegler-Natta catalyst treated with a catalyst modifier. The method involves changing the amount of the catalyst modifier added to the supported Ziegler-Natta polymerization catalyst to effect changes in the MFR of the resulting polymer.

A method for altering the melt flow ratio (MFR) of ethylene copolymers made in a gas phase reactor using a supported Ziegler-Natta catalyst treated with a catalyst modifier. The method involves changing the amount of the catalyst modifier added to the supported Ziegler-Natta polymerization catalyst to effect changes in the MFR of the resulting polymer.

Provided is a catalyst for polymerization of an olefin which is excellent in sustained polymerization activity in the polymerization of an -olefin and is capable of preferably producing an -olefin (co)polymer having high stereoregularity and MFR and favorable moldability. The present invention provides a catalyst for polymerization of an olefin, comprising: a solid catalyst component containing magnesium, titanium, halogen and an internal electron-donating compound; an organoaluminum compound; and external electron-donating compounds being of two types of alkoxysilane compounds having specific structures represented by the general formula (I) and the general formula (II), respectively, wherein the catalyst for polymerization of an olefin comprises 51 to 99% by mol of the external electron-donating compound represented by the general formula (I) and 1 to 49% by mol of the external electron-donating compound represented by the general formula (II) with respect to the total amount of both the external electron-donating compounds.

Provided is a catalyst for polymerization of an olefin which is excellent in sustained polymerization activity in the polymerization of an -olefin and is capable of preferably producing an -olefin (co)polymer having high stereoregularity and MFR and favorable moldability. The present invention provides a catalyst for polymerization of an olefin, comprising: a solid catalyst component containing magnesium, titanium, halogen and an internal electron-donating compound; an organoaluminum compound; and external electron-donating compounds being of two types of alkoxysilane compounds having specific structures represented by the general formula (I) and the general formula (II), respectively, wherein the catalyst for polymerization of an olefin comprises 51 to 99% by mol of the external electron-donating compound represented by the general formula (I) and 1 to 49% by mol of the external electron-donating compound represented by the general formula (II) with respect to the total amount of both the external electron-donating compounds.

Catalyst systems with single site transition metal complexes (such as quinolinyldiamide transition metal complexes), an activator, and a metal hydrocarbenyl transfer agent (preferably an aluminum vinyl-transfer agent) are disclosed for use in alkene polymerization.