Coupled styrenic block copolymers and process for preparing same
US7009000B2 · kind B2 · utility
9Cited by
37References
21Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2003 |
| Grant date | Mar 7, 2006 |
| Priority date | — |
| Expiry date | Jul 11, 2023 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08L53/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Disclosed is an improvement to a process for preparing coupled styrenic block copolymers wherein adding from about 0.01 to about 1.5 equivalents of a metal alkyl compound per equivalent of living polymer chain ends to the cement, during or after polymerization, improves coupling efficiencies. The resultant radial styrenic block copolymers have reduced amounts of 5+ arm oligomers which can be very desirable is certain applications, such as the modification of bitumen.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.