Chelate-activated vinyl chloride polymerization process
AssigneeImperial Chemical Industries PLC
InventorRoss J. Cozens
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Abstract
Process for the polymerization of vinyl chloride in aqueous suspension or microsuspension using an organo-soluble free-radical-yielding initiator wherein the initiator is progressively activated during polymerization by the progressive reduction of a non-initiator-activating water-soluble metal chelate complex to an initiator-activating form of the complex (which is otherwise substantially stable under the polymerization conditions) in which the metal is in a lower oxidation state, preferably a one- or two lower oxidation state.
Claims10
A process for the polymerisation of vinyl chloride in aqueous suspension or microsuspension using an organo-soluble free-radical-yielding initiator wherein the initiator is progressively activated during the polymerisation said activation being effected by the progressive reduction during the polymerisation of a non-initiator-activating water-soluble metal chelate complex which is present to an initiator-activating form of the metal chelate complex in which the metal is in a lower oxidation state and selected from the group consisting of iron, copper, cobalt, chromium, manganese, nickel, zinc and tin and ratio of non-initiator-activating metal chelate complex/initiator is within the range of from 1/10000 to 1/1.
Dependencies are inferred from the claim text.