A process for the polymerization of propylene is disclosed. The process may include contacting, in a gas phase polymerization reactor, propylene and optionally one or more comonomers with a catalyst system comprising a Ziegler-Natta catalyst and an external electron donor system comprising di(bicyclo[2.2.1]heptan-2-yl)dimethoxysilane.

The present invention presents a new method for preparation of an α-nucleated crystalline polypropylene based on polymeric nucleating agents and very high cooling rates, further the α-nucleated crystalline polypropylene based on polymeric nucleating agents derived thereof and its use in final articles derivable thereof.

The present invention presents a new method for preparation of an α-nucleated crystalline polypropylene based on polymeric nucleating agents and very high cooling rates, further the α-nucleated crystalline polypropylene based on polymeric nucleating agents derived thereof and its use in final articles derivable thereof.

An object of the present disclosure is to provide a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit and capable of improving an elastic modulus of a rubber composition. Specifically, the present disclosure provides a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit, wherein the difference (T.sub.em−T.sub.im) between an extrapolated melting end temperature (T.sub.em) as measured in accordance with JIS K7121 and an extrapolated melting initiation temperature (T.sub.im) as measured in accordance with JIS K7121 is not higher than 60° C.

An object of the present disclosure is to provide a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit and capable of improving an elastic modulus of a rubber composition. Specifically, the present disclosure provides a copolymer containing at least an acyclic non-conjugated olefin unit and a conjugated diene unit, wherein the difference (T.sub.em−T.sub.im) between an extrapolated melting end temperature (T.sub.em) as measured in accordance with JIS K7121 and an extrapolated melting initiation temperature (T.sub.im) as measured in accordance with JIS K7121 is not higher than 60° C.

The present invention relates to a semi-crystalline functionalized olefin copolymer composition and a process for the preparation of a semi-crystalline functionalized olefin copolymer composition.

The present invention relates to a semi-crystalline functionalized olefin copolymer composition and a process for the preparation of a semi-crystalline functionalized olefin copolymer composition.

Linear low-density polyethylene polymers used to form covering layers for cables are disclosed. Such polymers exhibit certain molecular weight distributions suitable to form the covering layers for the cable. The polymer can be crosslinked to exhibit suitable properties including retained elongation at break values and hot set values.

Linear low-density polyethylene polymers used to form covering layers for cables are disclosed. Such polymers exhibit certain molecular weight distributions suitable to form the covering layers for the cable. The polymer can be crosslinked to exhibit suitable properties including retained elongation at break values and hot set values.

This invention relates bisindenyl metallocene catalyst compounds having long (at least 4 carbon atoms) linear alkyl groups substituted at the two position and substituted or unsubstituted aryl groups at the four position and process using such catalyst compounds, particularly in the solution process at higher temperatures.