Retarded anionic polymerization of vinyl aromatic monomers using insoluble or heterogeneous retardants
OwnerEugene Moore, Duane Priddyinventors
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Abstract
This invention is a process to manufacture high quality vinyl aromatic polymer that is essentially free of unreacted vinyl aromatic monomer using retarded anionic polymerization wherein the retardant is insoluble and can be removed from the polymerization at an intermediate stage so that the polymerization can be carried to completion in the absence of the retardant.
Claims20
An improved anionic polymerization process of the type using an anionic polymerization initiator, wherein the improvement comprises using an insoluble polymerization retardant.
An improved polymerization retardant for use in an anionic polymerization processes, wherein the improvement is an insoluble polymerization retardant.
An anionic polymerization process to manufacture vinyl aromatic polymers having at least two polymerization zones wherein at least the first zone contains an insoluble polymerization retardant along with a soluble organo-lithium polymerization initiator.
Dependencies are inferred from the claim text.