Free radical polymerisation process
US5684101A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Oct 11, 1996 |
| Grant date | Nov 4, 1997 |
| Priority date | — |
| Expiry date | Oct 11, 2016 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC08F2/38
- WIPO fieldOrganic fine chemistry
- WIPO sectorChemistry
Abstract
Process for the free-radical polymerization of at least one olefinically unsaturated monomer, the polymerization being performed in the presence of a compound for effecting molecular weight control, being a CoII chelate of the following formula: ##STR1## wherein each group X is a divalent group which forms with the two carbon atoms to which it is bonded a pericondensed polycyclic group, being a group having 3 or more carbocyclic rings where the oxime-containing carbocyclic ring has carbon atoms in common with 2 or more of the other rings, the polycyclic group being unsubstituted (apart from the oxime groups) or having at least one hydrocarbyl substituent; and wherein each group Q is independently selected from F, Cl, Br, OH, C.sub.1-12 alkoxy, aryloxy, C.sub.1-12 alkyl and aryl; or two Q groups taken together provide on one or both boron atoms a group --O--(G)--O-- where G is a divalent aryl or alicyclic linking group or an alkylene linking group; or two Q groups taken together on one or both boron atoms provide a 1,5-cyclooctanediyl linking group; or being a CoIII analogue of the cobalt II chelate in which the Co atom is additionally covalently bonded to H, a halide or other anion…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.