Method for preparing living polymer in the presence of phosphazenium salt
US6528599B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 13, 2000 |
| Grant date | Mar 4, 2003 |
| Priority date | — |
| Expiry date | Apr 13, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F297/02
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
The present invention provides a method of preparing a polymer, which comprises subjecting a monomer containing at least a polar unsaturated compound to anionic polymerization in the presence of a phosphazenium compound represented by the formula (1): (wherein Z− is an anion of an active hydrogen compound in the form where a proton is eliminated from the active hydrogen compound and transferred to the anion; a, b, c and d each represents 1 or 0, but all of them are not simultaneously 0; and R may the same or different and each represents a hydrocarbon group having 1 to 10 carbon atoms, and two R(s) on the same nitrogen atom are optionally combined each other to form a cyclic structure), or in the presence of the phosphazenium compound and the active hydrogen compound. The resulting polymer is characterized by narrow molecular weight distribution.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.