METHODS FOR MODULATED DEGENERATIVE TRANSFER LIVING POLYMERIZATION AND ISOTACTIC-ATACTIC STEREOBLOCK AND STEREOGRADIENT POLY(OLEFINS) THEREBY
摘要
<p>Methods for modulated degenerative transfer living polymerization and isotactic-atactic stereoblock and stereogradient poly(olefins) thereby Abstract A method of producing a multiblock, stereoblock polyolefin having substantially uniform microstructure is disclosed. The method includes contacting a Ziegler-Natta pre-catalyst with a co-catalyst and an olefin to polymerize the olefin and form a first stereoblock, adding a methyl donator that changes the stereoregularity of the polymerization, and polymerizing the olefin to form a second stereoblock. The methods of the present invention allow for the production of poly(olefin)s having predictable degrees of incorporation of stereoerrors of a known type. The methods allows for the production of a variety of poly(olefin) microstructures, ranging from stereoblock to stereogradient poly(olefin)s and poly(olefin)s having fully isotactic to fully atactic microstructures.</p>
申请公布号
WO2006102119(A2)
申请公布日期
2006.09.28
申请号
WO2006US09793
申请日期
2006.03.17
申请人
SITA, LAWRENCE, R.;HARNEY, MATTHEW, B.;ZHANG, YONGHUI
发明人
SITA, LAWRENCE, R.;HARNEY, MATTHEW, B.;ZHANG, YONGHUI