Controlled free radical emulsion and water-based polymerizations and seeded methodologies
US6559255B2 · kind B2 · utility
5Cited by
7References
4Claims
0Family size
Assignee
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Key dates
| Filing date | Mar 8, 2000 |
| Grant date | May 6, 2003 |
| Priority date | — |
| Expiry date | Mar 8, 2020 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F220/585
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
Nitroxides having an alpha-carbon atom with a destabilizing moiety are effective control agents for emulsion and water-based polymerizations, including the formation of block copolymers from a wide range of monomers. The nitroxide radicals may be used as a free radical or as an adduct with a residue from the initiator. The emulsions have living characteristics, including the re-initiation of polymer chains. Also, a seeded process for emulsions, which includes the step-wise addition of monomer is disclosed, providing access to a wide range of initiator types.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.