Emulsion polymerisation process
AssigneeCelanese International Corporation
InventorDavid Charles Adams
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Abstract
An emulsion polymerization process using a redox initiator comprising a reductant and an oxidant, wherein monomers are mixed into a carrier liquid, e.g. water, to make a pre-emulsion, which is then supplied to a reactor comprising one or more circulation loops, an outlet, and a circulation pump for circulating a reactor charge within the circulation loop, characterized in that the reductant is added to the pre-emulsion before it is mixed into the reactor charge and the oxidant is mixed into the reactor charge, e.g., via the water-phase feed.
Claims16
An emulsion polymerization process using a redox initiator comprising a reductant and an oxidant, the process comprising:
- mixing monomers into a carrier liquid to make a pre-emulsion having a monomer content of at least 10% by weight of the pre-emulsion;
- supplying the pre-emulsion via a first feed line to a reactor comprising one or more circulation loops, an outlet, and a circulation pump for circulating a reactor charge within the circulation loop;
- adding the reductant to the pre-emulsion instead of the oxidant via the first feed line to the reactor;
- and
- separately metering the oxidant into the reactor charge via a second feed line entering the circulation loop.
Dependencies are inferred from the claim text.