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
Method and apparatus for determining storage capacity error for a data storage device
Method of motion correction in optical coherence tomography imaging
Methods of producing the membranes and the uses of membranes as battery separator films
Over the counter medicinal container with surface ornamentation
Efficient implementation of hash algorithm on a processor
Single-stage PFC converter with constant voltage and constant current
Vacuum cleaner
  Randomly Featured Patents
Method, instrument and anastomotic fitting for use when performing an end-to-side anastomosis
Synthesis of chabazite-containing molecular sieves and their use in the conversion of oxygenates to olefins
Permanent wave hair curler
Three-dimensional optical memory
Heat--developable photosensitive material containing latex polymer in outermost layer
High strength ceramic fiber board
Non-clogging film fill assembly for counterflow water cooling tower
Pyrazol-1-ylphenylacetic acids
Furnace air filter
Partial thromboplastin, its use as diagnostic agent and process for preparing it