Process for the preparation of block copolymers
US5264489A · kind A · utility
3Cited by
6References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 26, 1993 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Mar 26, 2013 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08G81/022
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
Coupling of block base copolymers terminated by a lithium atom of the typical formula S-B-Li, in which S is a monovinylaromatic hydrocarbon block and B is a conjugated diene block, by the use of at least one difunctional deactivating coupling agent and at least one polyfunctional deactivating coupling agent in a molar ratio such that the linear polymer obtained by coupling represents 65 to 95% by weight of the total polymer material obtained by coupling.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.