摘要:
Catalyst systems and methods for making and using the same are provided. The catalyst system can include a catalyst compound having (1) at least one cyclopentadienyl ligand and at least one heteroatom ligand; (2) two non-bridged cyclopentadienyl ligands; or (3) two or more heteroatom ligands. The catalyst system further comprise a support comprising fluorinated silica. The support may be essentially free of alumina. The catalyst system further comprises an aluminoxane, preferably methylaluminoxane, modified methylaluminoxane, or a combination thereof.
摘要:
An optical security system having a key, an optic lock, and a processing system. The lock generally has a plurality of optic reflective sensors, a plurality of rotatable readable discs, and a controller for processing information to and from the plurality of sensors. The optic security lock senses the surface changes of state during the rotation of the plurality of discs caused by the turning of the fully-engaged key. The data from the sensors is communicated to the controller, with the controller having a processor capable of processing data from the sensors to generate a lock command signal. The lock can include a plurality of detent mechanisms to provide precision interval alignment of the sensors with the rotatable discs to accurately sense the surface changes of state.
摘要:
Catalyst systems and methods for making and using the same. The catalyst system can include a single site catalyst compound, a support comprising fluorinated alumina, and an aluminoxane. The aluminoxane can be present in an amount of about 10 mmol or less per gram of the support.
摘要:
Disclosed herein are various processes, including continuous fluidized-bed gas- phase polymerization processes for making a high strength, high density polyethylene copolymer, comprising (including): contacting monomers that include ethylene and optionally at least one non-ethylene monomer with fluidized catalyst particles in a gas phase in the presence of hydrogen gas at an ethylene partial pressure of 100 psi or more and a polymerization temperature of 120°C or less to produce a polyethylene copolymer having a density of 0.945 g/cc or more and an ESCR Index of 1.0 or more wherein the catalyst particles are prepared at an activation temperature of 700°C or less, and include silica, chromium, and titanium.
摘要:
Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight distribution can be produced with chromium oxide catalyst supported on silica having particular values of surface area and pore volume in conjunction with alkyl silanols, aluminium alkyls, and silyl chromate, optionally also with titanium alkoxides.
摘要:
Catalyst systems and methods for making and using the same are provided. The catalyst system can include a catalyst compound having (1) at least one cyclopentadienyl ligand and at least one heteroatom ligand; (2) two non-bridged cyclopentadienyl ligands; or (3) two or more heteroatom ligands. The catalyst system further comprise a support comprising fluorinated silica. The support may be essentially free of alumina. The catalyst system further comprises an aluminoxane, preferably methylaluminoxane, modified methylaluminoxane, or a combination thereof.
摘要:
The present invention is broadly directed to various methods and systems for gas and liquid phase polymer production. In certain embodiments, the methods are performed in conjunction with a polymerization reactor system such as gas phase reactor system or liquid phase reactor system. The invention is also broadly directed to various systems in which polymer properties are manipulated by addition of DEALE directly to a polymerization reactor system.
摘要:
Broad molecular weight polyethylene and polyethylene having a bimodal molecular weight profile can be produced with chromium oxide based catalyst systems employing alkyl silanols. The systems may also comprise various organoaluminum compounds. Catalyst activity and molecular weight of the resulting polyethylene may also be tuned using the present invention.