Polymerization process
US6306995A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 18, 1999 |
| Grant date | Oct 23, 2001 |
| Priority date | — |
| Expiry date | Nov 18, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F4/00
- WIPO fieldMacromolecular chemistry, polymers
- WIPO sectorChemistry
Abstract
A process for polymerization of vinyl monomers is described comprising (a) forming an initiator comprising an organic iodide compound by reacting an initiator precursor comprising an organic bromide or chloride compound with an inorganic iodide salt under phase transfer catalysis in the presence of a phase transfer agent, and (b) polymerizing vinyl monomers in the presence of the formed initiator and a polymerization catalyst comprising an onium salt. Most preferably, both the phase transfer agent and the polymerization catalyst comprise an onium salt. The present invention provides a novel method for living polymerization of vinyl monomers under phase transfer conditions, which provides a high level of macromolecular control over polymerization process and which leads to more uniform and more controllable polymeric products. Oil soluble monomers may be polymerized in organic solvent or water-organic two phase solvent systems, while water soluble monomers may be polymerized in water or water-organic two phase solvent systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.