| abstract |
By utilizing the vapor phase polymerisation techniques of the present invention, numerous distinct and highly beneficial advantages are realized. For instance, cis-1,4-polybutadiene and high cis-1,4-polybutadiene rubber having a consistent and controllable molecular weight can be easily and practically prepared without utilizing a solvent. The supported catalyst is mixed prior to its introduction into the reaction zone. The supported, preformed catalyst system is introduced into the reaction zone (11) by feeding the catalyst into the reactor via catalyst feed line (27) at point (28) which is in the upper portion of the reaction zone. |