发明名称 |
Process for preparation of polyolefins via degenerative transfer polymerization |
摘要 |
Disclosed is a method of producing a polyolefin composition comprising contacting a metallocene pre-catalyst with a substoichiometric amount of a co-catalyst; adding a first olefin monomer; and polymerizing the first monomer for a time sufficient to form the polyolefin. The method allows for the use of a minimum amount of activating co-catalyst, and allows for the production of stereoregular and non-stereoregular polyolefins. The use of configurationally stable metallocene pre-catalysts allows for the production of monomodal isotactic polyolefins having narrow polydispersity. The use of configurationally unstable metallocene pre-catalysts allows for the production of monomodal atactic polyolefins having narrow polydispersity. The method of the present invention optionally further comprises contacting the polyolefin with a second amount of said co-catalyst; adding a second olefin monomer; polymerizing said second olefin monomer to form a block-polyolefin composition. Also disclosed are monomodal diblock copolymer compositions made according to the present invention.
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申请公布号 |
US2007203310(A1) |
申请公布日期 |
2007.08.30 |
申请号 |
US20070698975 |
申请日期 |
2007.01.29 |
申请人 |
UNIVERSITY OF MARYLAND, COLLEGE PARK |
发明人 |
SITA LAWRENCE R. |
分类号 |
C08F4/72;C08F4/659;C08F10/00;C08F10/14;C08F110/14;C08F297/08 |
主分类号 |
C08F4/72 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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