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
Motion-compensated prediction of inter-layer residuals
System and method for outputting virtual textures in electronic devices
Inkjet ink
Handling errors in a data processing system
Carbonyl-ene functionalized polyolefins
Non-volatile memory array and device using erase markers
Switchgear operating apparatus and three-phase switchgear
  Randomly Featured Patents
Coupling for an elongate member having internal passageways
Weather-responsive shade control system
Compilation of computer program for execution on single compiling computer and for execution on multiple distributed computer system
Cardiac stem cell and myocyte secreted paracrine factors
Polynucleotide encoding a genetically engineered P30 antigen
Abrasive process for modifying corners, edges, and surfaces of capacitor anode bodies
Jewelry box with security locker
Network connector for computer
Method for manufacturing SOI substrate
Dishwasher and method of supplying water of dishwasher