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
Injection molding method and injection molding machine
Digital watermark embedding apparatus, digital watermark embedding method, and digital watermark detection apparatus
Multi-level integrated circuit, device and method for modeling multi-level integrated circuits
Concentrating photovoltaic system module with actuator control
Receiver and transmitter receiver system
Wrench
Systems and methods for restoring images
  Randomly Featured Patents
Mixing system with condenser
Package for an optical device
Process and system for the visual display of moving targets
Azalea plant named `Roblem`
Progress displaying system and method thereof
Roof bolt bit
Chaise longue
Acceleration of lipid metabolism using vanillylamine derivatives
Electrical device, in particular a switching and control unit for motor vehicles
Drainage tube with heat transfer function and methods of use