A process for preparing homopolymers and copolymers of addition polymerizable monomers, or mixtures of such monomers, and the resulting polymer, wherein the process comprising contacting said monomer or mixture under high monomer conversion polymerization conditions with a catalyst composition comprising:
a) a catalyst system comprising a Group 3-10 metal complex; and
c) a silane, or hydrocarbylsilane corresponding to the formula:
JjSiH4−j or AnJjSiH4-(n+j)
wherein:
J is C1-40 hydrocarbyl,
A is a C2-20 alkenyl group,
n is 1 or 2, and
j is 0 or 1;
wherein the polymer comprises from 0.1 to 100 long chain branches per 10,000 carbons, and at least some of which comprise a silane branching center.
Alkenylsilane Structure Effects on Mononuclear and Binuclear Organotitanium-Mediated Ethylene Polymerization: Scope and Mechanism of Simultaneous Polyolefin Branch and Functional Group Introduction
作者:Smruti B. Amin、Tobin J. Marks
DOI:10.1021/ja0675292
日期:2007.3.1
total branchcontent follow the trend C3H5SiH3 < C4H7SiH3 approximately C6H11SiH3 approximately C8H15SiH3, with gel permeation chromatography-multi-angle laser light scattering-derived branching ratios (gM) approaching 1.0 for C8H15SiH3. Time-dependent experiments indicate a linear increase of copolymer Mw with increasing polymerization reaction time. This process for producing long-chainbranched polyolefins