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
Reference circuit with curvature correction using additional complementary to temperature component
Apparatus, method and program for image receipt, processing, conversion, and delivery to and from a plurality of external apparatuses
Server-side connection resource pooling
Maize variety X00C175
Method of sending CTI messages in a communication system
System and method for a driver circuit with a referenced control signal
Coordinated multi-point transmission in a cellular network
  Randomly Featured Patents
Ignitor circuit for discharge lamps with novel ballast
Inkjet printer ink cartridge
Integrated pressure sensor unit and solenoid valve unit
System, method and computer program product for transforming a polynomial equation from a coordinate frame of one tile to a coordinate frame of another tile at a finer level of a hierachy
Test apparatus providing pulsatile flow service for test samples
Tobacco composition
Welding line system and method of welding workpieces
Imaging lens
Method and apparatus for intelligently generating an error report in a radio communication system
Ophthalmic applanator