Heterocyclic alkoxyamines as regulators in controlled radical polymerization processes
US6479608B1 · kind B1 · utility
25Cited by
2References
26Claims
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Assignee
Inventors
Key dates
| Filing date | Oct 14, 1999 |
| Grant date | Nov 12, 2002 |
| Priority date | — |
| Expiry date | Oct 14, 2019 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC07D265/32
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to the use of 6, 7 and 8 membered heterocyclic alkoxyamines or their nitroxyl precursors, which have a high steric hindrance in the &agr;-position to the alkoxyamine group, as regulators/initiators which allow for very efficient and fast polymerization at higher temperatures, but that also work at relatively low temperatures such as for example 100° C. The higher steric hindrance may be introduced by at least one higher alkyl substituent than methyl in the &agr;-position to the alkoxyamine group. In many cases even higher hindrance by two, three or four higher alkyl groups may be advantageous.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.