Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
Process and catalyst for producing crystalline polyolefins










Image Number 6 for United States Patent #5589556.

Catalyst and process for the stereospecific propagation of a polymer chain derived from an ethylenically unsaturated monomer which contains 3 or more carbon atoms or is substituted vinyl compound. The catalysts comprise stereorigid metallocenes in which a structural bridge is not required for stereorigidity. The ring structures of the metallocene catalyst are substituted cyclopentadienyl rings. The substituent groups on the cyclopentadienyi rings impart stereorigidity to the catalyst by virtue of a sterically hindered relationship between the rings sufficient to prevent rotation of the rings. The catalyst is contacted with a C.sub.3 + alpha olefin or other ethylenically unsaturated compound in a polymerization reaction zone and maintained in contact with the catalyst in the reaction zone under polymerization conditions to produce a stereospecific polymer.








 
 
  Recently Added Patents
Diagnostic data interchange
Launch cable case
Permutational memory cells
Architectural panel with Tarwe and grass
Particulate filter with hydrogen sulphide block function
Security patch update processor
Shoe
  Randomly Featured Patents
Impact absorbing means for shipping cask
Propeller repair apparatus
Method of fabricating liquid crystal display panel for coating liquid on substrate
Data processing device
Counter weighted lifting beam
Firing-readiness diagnostic of a pyrotechnic device such as an electronic detonator
Socket apparatus
Receiver structure of stethoscope
Central vacuum inlet mounting plate with removable protector
Biological sample reaction chip, biological sample reaction apparatus, and biological sample reaction method