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
Lighting apparatus
Portable computer display structures
Lentiviral gene transfer vectors and their medicinal applications
Bias voltage generating circuit and switching power supply thereof
Device with a floating head having a heater element
Personalized dashboard architecture for displaying data display applications
Operation controlling apparatus
  Randomly Featured Patents
Functionally selective ALPHA2C adrenoreceptor agonists
Diepoxides, processes for their manufacture and use
Vehicle-washing system for washing of vehicles
Method and apparatus for reversing performance degradation in semi-conductor detectors
Filter-subtract-decimate hierarchical pyramid signal analyzing and synthesizing technique
Method and apparatus for implementing a branch target buffer cache with multiple BTB banks
Laminate with indicia for an absorbent article
Method of controlling exhaust gas purification system, and exhaust gas purification system
Current conducting atmosphere control sleeve for electroslag furnace
Pleated bag for interventional pullback systems