Patent ID: 6066705
Filing Date: 2000-05-23
Classification: B01J,C08F,G09F,Y10S

Abstract:
A method for vapor phase polymerizing isoprene into cis-1,4-polyisoprene in a process comprising the steps of:(1) charging into a reaction zone said isoprene and a preformed catalyst system which is made by reacting an organoaluminum compound with titanium tetrachloride in the presence of at least one ether; wherein the isoprene is maintained in the vapor phase in said reaction zone by a suitable combination of temperature and pressure and wherein the catalyst system is suspended on an inert solid support;(2) allowing said isoprene to polymerize into cis-1,4-polyisoprene at a temperature within the range of about 0.degree. C. to about 100.degree. C., wherein said polymerization is conducted in the presence of at least one diarylamine; and(3) withdrawing said cis-1,4-polyisoprene from said reaction zone.