Abstract:
A novel loop/slurry olefin polymerization process is provided which produces ultra high molecular weight ethylene homopolymers and ultra high molecular weight ethylene copolymers. Catalyst systems used are selected from the group consisting of inorganic oxide supported titanium-containing catalyst systems, inorganic oxide supported organo-zirconium catalyst systems and inorganic oxide supported organo-hafnium catalyst systems.
Abstract:
Fluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.
Abstract:
Ethylene polymer blends of a virgin or recycled low molecular weight ethylene polymer produced from a chromium-based catalyst and a high molecular weight ethylene polymer produced from a titanium-based catalyst, exhibit excellent processing characteristics, environmental stress crack resistance and stiffness. These ethylene polymer blends are useful for use in bottle, film, pipe, and/or drum applications.
Abstract:
Fluorenyl-containing metallocenes are disclosed along with methods for making the metallocenes. Also disclosed are methods for using the metallocenes as polymerization catalysts. In addition, polymers resulting from such polymerizations are disclosed.
Abstract:
A catalyst mixture is disclosed comprising (1) a particulate chromium-containing catalyst comprising inorganic oxide and chromium and (2) a particular type of particulate titanium-containing catalyst. Also disclosed is the use of this catalyst mixture to produce particularly novel olefin polymers.
Abstract:
This invention relates to a high-temperature slurry polymerization of ethylene where: the hexene is generated in situ; a chromium catalyst system is used; a trialkyl boron or a polyalkyl silane compound is used as a cocatalyst; the temperature of the reaction is above the foul curve temperature for a specific copolymer density; and where the polymerization takes place in a continuous loop reactor which has isobutane as a diluent. Additionally, hexene can be withdrawn, or added, to adjust the density.
Abstract:
A copolymer of ethylene and a higher alpha-olefin, preferably 1-hexene and/or 4-methyl-1-pentene, can be produced using an activated and subsequently carbon monoxide reduced chromium containing catalyst and a trialkyl boran cocatalyst. The polymerization process must be carefully controlled to produce a copolymer resin that can be made into a tough, impact resistant film.