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
Resin composition and molded article
Process for the preparation of ethylene homopolymers or copolymers in a high-pressure reactor controlled by a model based predictive controller
Fibrous laminate interface for security coatings
Polarity switching member of dot inversion system
Horizontal cable manager
Solid state lighting circuit and controls
Organic light emitting display apparatus
  Randomly Featured Patents
Haptics cone
Data transmission in wireless communication system
Preparation of potato crisps and chips
Street sweeper main broom assembly
Connector engagement device
Liquid crystal display device having light shielding film and birefringent films with N.sub.x =N.sub.z >N.sub.y
Process for the production of acetaldehyde by the reaction of methanol with synthesis gas
Portable light weight completely self-contained emergency single patient ventilator/resuscitator
Electric drive for fiber or thread winding machines and method of operating winding machines
Magnetically enhanced plasma process and apparatus