Organolithium polymerization initiators and their preparations
US4075253A · kind A · utility
9Cited by
7References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 15, 1975 |
| Grant date | Feb 21, 1978 |
| Priority date | — |
| Expiry date | May 15, 1995 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07F1/02
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
A stable and non-polar solvent soluble alpha-methylstyrene-conjugated diene oligomer dilithium as a polymerization initiator is obtained by preparing a dilithium initiator solution by reacting lithium metal with alpha-methylstyrene in a polar solvent at low temperature, thereafter adding gradually a small amount of a conjugated diene to the dilithium initiator solution to consume completely the alpha-methylstyrene, and then adding additional conjugated diene in a certain amount so as to prepare the stable and non-polar solvent soluble alpha-methylstyrene-conjugated diene oligomer dilithium.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.