Control over controlled radical polymerization processes
First Claim
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1. A polymer manufacturing process, comprising:
- a) forming a mixture in a reactor, comprising combining;
i) at least a first free-radically polymerizable compound;
ii) an atom transfer radical polymerization initiator;
iii) a metal catalyst; and
iv) optionally, a ligand;
b) initiating polymerization by adding an initial amount of a non-activated reducing agent at a first temperature to transform the metal catalyst to an active metal catalyst or regenerate the active metal catalyst; and
c) minimizing or preventing uncontrolled exotherms during the polymerization process by adding further amounts of the non-activated reducing agent at a controlled rate of addition to regenerate the active metal catalyst.
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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.
205 Citations
18 Claims
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1. A polymer manufacturing process, comprising:
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a) forming a mixture in a reactor, comprising combining; i) at least a first free-radically polymerizable compound; ii) an atom transfer radical polymerization initiator; iii) a metal catalyst; and iv) optionally, a ligand; b) initiating polymerization by adding an initial amount of a non-activated reducing agent at a first temperature to transform the metal catalyst to an active metal catalyst or regenerate the active metal catalyst; and c) minimizing or preventing uncontrolled exotherms during the polymerization process by adding further amounts of the non-activated reducing agent at a controlled rate of addition to regenerate the active metal catalyst. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18)
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Specification