Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
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 800.degree. C.








 
 
  Recently Added Patents
Receiver with feedback continuous-time delta-sigma modulator with current-mode input
Catalysts for hydrodeoxygenation of polyols
Method and apparatus for using virtual machine technology for managing parallel communicating applications
Focusing apparatus that effectively sets a focus area of an image when a focusing mode is changed
Machine tool with an electrical generator for passive power generation
Transmitting apparatus and retransmitting method
Digital watermark embedding apparatus, digital watermark embedding method, and digital watermark detection apparatus
  Randomly Featured Patents
Fabrication process for a 1-transistor EEPROM memory device capable of low-voltage operation
Automatic method for sorting plastic pellets
Method for making a transformer having improved space factor
Method and apparatus for removal of unreacted monomer from synthesized high polymer latex
Fixing device, image forming apparatus including the fixing device, and fixing method
Non-particulate, non-flowable, non-repellant insecticide-bait composition for the control of cockroaches
Rotating balloon expandable sheath bifurcation delivery
Multiport memory device comprising random access port and serial access port
Modeling method, apparatus, and computer readable medium for creating three-dimensional analysis model of a target object to analyze data transmission
Fluid-filled bladder for an article of footwear