Resources Contact Us Home
Multimodal polyethylene obtained with multilayer chromium catalyst

Image Number 2 for United States Patent #7851400.

The present invention concerns a catalyst for the production of high density polyethylene, by homopolymerising ethylene or copolymerising ethylene and an alpha-olefinic comonomer comprising 3 to 10 carbon atoms, prepared by the steps of: a) selecting a silica support with a specific surface area larger than 300 m.sup.2/g; b) treating the silica support with a titanium compound, in order to introduce titanium into the support, or with an aluminium compound, in order to introduce aluminum into the support; c) either treating the titanated silica support with an aluminum compound, in order to introduce aluminum into the titanated silica support, or treating the aluminated silica support with a titanium compound, in order to introduce titanium into the aluminated silica support; d) depositing a chromium compound on the titanated and aluminated silica support to form a catalyst; e) activating the catalyst of step d) under air in a fluidised bed at a temperature of from 600 to C.

  Recently Added Patents
Wind driven generator for vehicles
Communication device and method for detecting a radio signal
Hydroxyl-terminated thiocarbonate containing compounds, polymers, and copolymers, and polyurethanes and urethane acrylics made therefrom
Sensing during magnetic resonance imaging
Circuit arrangement having a load transistor and a voltage limiting circuit and method for driving a load transistor
Methods of fabricating semiconductor device
Providing a multi-tenant knowledge network
  Randomly Featured Patents
Managing distributed functional modules using standard management applications
Gaming system and gaming method
Modular cabinet box
Needle blow nozzle and blow molding apparatus
Vehicle door with door beam
Combined automobile cartridge player and radio receiver or the like
Permanent magnet rotor arrangement and method for producing such an arrangement
Electrical switch assembly having two-part housing with cover part consisting of plural flanges, internal rotation limit stop and external bushing
Method and apparatus for moving a high pressure fluid aperture in a well bore servicing tool
Vanity vest