METHODS FOR MODULATED DEGENERATIVE TRANSFER LIVING POLYMERIZATION AND ISOTACTIC-ATACTIC STEREOBLOCK AND STEREOGRADIENT POLY(OLEFINS) THEREBY
摘要
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.
申请公布号
WO2006102106(A9)
申请公布日期
2006.11.09
申请号
WO2006US09767
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