Catalyst composition comprising shuttling agent for regio-irregular multi-block copolymer formation
US7981992B2 · kind B2 · utility
9Cited by
89References
6Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 30, 2006 |
| Grant date | Jul 19, 2011 |
| Priority date | — |
| Expiry date | Apr 12, 2028 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L2308/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Copolymers, especially multi-block copolymer containing therein two or more segments or blocks, are prepared by polymerizing propylene, 4-methyl-1-pentene, or another C4-8 α-olefin in the presence of a composition comprising the admixture or reaction product resulting from combining: (A) a first metal complex olefin polymerization catalyst, (B) a second metal complex olefin polymerization catalyst capable of preparing polymers having increased incidence of regio-irregular branching compared to the polymer prepared by catalyst (A) under equivalent polymerization conditions, and (C) a chain shuttling agent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.