Patent ID: 8178636
Filing Date: 2012-05-15
Classification: C08F,Y10S

Abstract:
1. A process for obtaining an atactic, amorphous 1-butene homopolymer comprising polymerizing 1-butene in the presence of a catalyst system obtained by contacting: a) at least one meso or meso-like metallocene compound of formula (I) wherein M is an atom of a transition metal selected from those belonging to group 3, 4, 5, 6 or to the lanthanide or actinide groups in the Periodic Table of Elements; p is an integer from 0 to 3, wherein p is equal to a formal oxidation state of M minus 2; X, same or different, is hydrogen, halogen, R, OR, OSO L is a divalent C R T, same or different, are a moiety of formula (IIa) or (IIb): wherein the atom marked with the symbol * bonds the atom marked with the same symbol in the compound of formula (I); R R R R b) an alumoxane or a compound capable of forming an alkyl metallocene cation; wherein the atactic, amorphous 1-butene homopolymer comprises an isotactic pentad content (mmmm) lower than 15% and an intrinsic viscosity of at least 1.3 dL/g.