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US 9,518,136 B2Granted
Control over reverse addition fragmentation transfer polymerization processes
AssigneeATRP Solutions, Inc.
InventorsWojciech Jakubowski, James Spanswick
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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.
Claims28
A RAFT polymerization process, comprising:
- a) forming a polymerization mixture, comprising:
- i) at least a first free-radically polymerizable compound;
- and
- ii) a RAFT agent;
- b) minimizing uncontrolled exothermic reactions during the polymerization process by:
- 1) initiating RAFT polymerization by adding an initial amount of a free-radical initiator at a first temperature to the polymerization mixture to generate activated RAFT agents;
- and
- 2) adding further amounts of the free-radical initiator at a controlled rate of addition to the polymerization mixture to generate or regenerate activated RAFT agents.
5 more elements
A RAFT polymerization process, comprising:
- a) forming a polymerization mixture, comprising:
- i) at least a first free-radically polymerizable compound;
- and
- ii) a RAFT agent;
- b) minimizing uncontrolled exothermic reactions during the polymerization process by:
- 1) initiating RAFT polymerization by adding an initial amount of a free-radical initiator at a first temperature to the polymerization mixture to generate activated RAFT agents;
- and
- 2) adding further amounts of the free-radical initiator at a controlled rate of addition to the polymerization mixture to generate or regenerate activated RAFT agents, wherein the controlled rate of addition is adjusted to be commensurate with rate of radical-radical termination reactions.
5 more elements
Dependencies are inferred from the claim text.