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Graft copolymerization process

  • US 4,107,238 A
  • Filed: 01/22/1976
  • Issued: 08/15/1978
  • Est. Priority Date: 01/22/1976
  • Status: Expired due to Term
First Claim
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1. A method for grafting styrene monomer in high grafting efficiency onto an elastomeric isobutylene-conjugated diene copolymer which comprises the steps of:

  • (a) forming a solution of the elastomer in an inert hydrocarbon solvent;

    (b) treating said solution with an organolithium chelating polyamine composition whereby a polymer lithium polyamine complex is formed;

    (c) treating said complex with from 2 to 50 volume % of an organic monoether or polyfunctional ether whereby unreacted organolithium polyamine is decomposed; and

    (d) contacting the styrene monomer with the treated complex of step (c) whereby a graft copolymer is formed, at least a major proportion of the reacted styrene monomer being present in said graft copolymer, and said copolymer is a thermoelastomer.

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