Resources Contact Us Home
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
Method for providing interactive site map
Implantable medical devices including elongated conductor bodies that facilitate device and lead configuration variants
Flat panel display device and method of fabricating the same
Power supply system for motor vehicle
High power insulated gate bipolar transistors
Liquid crystal display
Disk drive with a subset of sectors with reduced write-to-read gap
  Randomly Featured Patents
Bone densitometer providing assessment of absolute fracture risk
Pill sorting device
Cable with lubricated optical fibers and process of lubricating optical fibers
Predictive adaptive media streaming
Method of collecting and recording refuse
Method and apparatus for forming packaging structures
Authentication of a user to a telephonic communication device
Intra-digital orthosis for use in shooting a ball such as a basketball
Method and device for preventing zinc/iron interaction in a semiconductor laser
Digital press