Process and catalyst for producing syndiotactic polyolefins Patent #: 4892851
ApplicationNo. 721049 filed on 06/26/1991
US Classes:526/348.6, At least four carbon atoms526/160, Transition metal bonded to carbon atom526/901MONOMER POLYMERIZED IN VAPOR STATE IN PRESENCE OF TRANSITION METAL CONTAINING CATALYST
ExaminersPrimary: Teskin, Fred
Foreign Patent References
International ClassesC08F 210/06
Foreign Application Priority Data1990-06-27 IT
AbstractEssentially syndiotactic crystalline copolymers of propylene with minor proportions of 1-butene, endowed with good mechanical properties, lowered melting point and limited solubility in xylene at 25° C. and the process for their preparation by polymerizing mixtures of propylene with 1-butene, by using catalysts obtained form stereorigid and chiral zirconium and hafnium compounds and from polymethylalumoxane compounds.