Patent ID: 6075103
Filing Date: 2000-06-13
Classification: C08F

Abstract:
A process for polymerizing .alpha.-olefins (3.ltoreq.C.ltoreq.10) with silanes as chain-transfer agents preparing and forming a silyl-terminated homopolymer comprising:mixing(A) an .alpha.-olefin (3.ltoreq.C.ltoreq.10);(B) a silane;(C) and a catalyst comprising a metallocene compound with a formula of Cp.sub.m MX.sub.n Y.sub.p or CpMX.sub.d and a co-catalyst or ##STR4## wherein Cp denotes a cyclopentadienyl radical;Z is SiR*.sub.2, CR*.sub.2, SiR.sub.2 SiR*.sub.2 SiR*.sub.2, CR*.sub.2 CR*.sub.2, CR*.dbd.CR*, CR*.sub.2 SiR*.sub.2, GeR*.sub.2, SnR.sub.2 *;R,R* is selected from the group consisting of alkyl radicals having 1 to 4 carbon atoms, aryl radicals and methoxy;M is a metal selected from the group consisting of Ti, Hf, and Zr;X is an inert anionic organic ligand (C.ltoreq.20);Y is a heteroatom ligand, selected from the group consisting of --O--, --S--, --NR*--, --PR*-- and a neutral two electron donor ligand selected from the group consisting of --CR*, --SR*, --NR*.sub.2 and --PR*.sub.2 ;n and m are integers, (n.ltoreq.3, m.ltoreq.4) such that (m+n)=the valence of said metal M;p is 1 or 2;d is 1 or 2;said co-catalyst is acidic thereby forming a homopolymer consisting essentially of polymerized monomers (3.ltoreq.C.ltoreq.10) with a silyl termination.