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
Solid state lighting devices with cellular arrays and associated methods of manufacturing
Quinazoline compounds and their use in perfume compositions
Mobile communication device
Method of treating cancer using a survivin inhibitor
Communication apparatus, integrated circuit, and communication method
Electric power supply system and electric power supply system for motor vehicle
Shot scent dispenser
  Randomly Featured Patents
Elevator system and associated method including power control for operating an elevator in an emergency mode
Diagnostic test for thrombotic or thromboembolic disease
Anti-corrosion device for electrical discharge machining
Coating compositions
Apparatus for securely yet removably installing an ornament onto a substantively planar surface
Packing apparatus for an automated manufacturing system of lithium secondary battery
Buccal tube insert
Flowmeter for gases
Thrombin receptor radioligands
Fixation device