Back to results
US 2014/0155512 A1Published application
Control Over Controlled Radical Polymerization Processes
AssigneeATRP Solutions, Inc.
InventorsWojciech Jakubowski, James Spanswick
Life of this patent
Estimating the term…
Abstract
A procedure for improved temperature control in controlled radical polymerization processes is disclosed. The procedure is directed at controlling the concentration of the persistent radical in ATRP and NMP polymerizations procedures and the concentration of radicals in a RAFT polymerization process by feeding a reducing agent or radical precursor continuously or intermittently to the reaction medium through one of more ports.
Claims14
A polymerization process, comprising:
- polymerizing free radically (co)polymerizable monomers in the presence of a reducing agent and a polymerization medium initially comprising:
- at least one transition metal catalyst;
- and
- an atom transfer radical polymerization initiator;
- and
- wherein the molar ratio of the transition metal catalyst to the atom transfer radical polymerization initiator is less than 0.10, preferably less than 0.05;
- and
- wherein the reducing agent is continuously added to the reaction medium at a rate commensurate with the rate of radical-radical termination reactions.
5 more elements
A polymerization process, comprising:
- polymerizing free radically (co)polymerizable monomers in the presence of an alkoxyamine wherein the concentration of the formed nitroxide, the persistent radical in a NMP, is controlled by the rate of decomposition of the added initiator whereby the rate of decomposition of the added initiator is selected to match the rate of radical/radical termination reactions that would otherwise build up the concentration of the stable free radical and reduce the rate of propagation.
A polymerization process, comprising:
- polymerizing free radically (co)polymerizable monomers in the presence of a degenerative transfer agent wherein the rate of polymerization is controlled by the rate of decomposition of the added initiator whereby the rate of decomposition of the added initiator is selected to maintain the selected reaction temperature.
Dependencies are inferred from the claim text.