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Acrylates as coupling agents for star-block copolymers

  • US 4,503,188 A
  • Filed: 06/20/1983
  • Issued: 03/05/1985
  • Est. Priority Date: 06/20/1983
  • Status: Expired due to Fees
First Claim
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1. In a process for the preparation of star-block homopolymers and copolymers of conjugated diene-monomers alone or with monovinyl aromatic monomers by the solution polymerization of the monomers with a monolithium initiator and then coupling the resultant lithiated homopolymer or copolymer with a coupling agent, the improvement comprising using as the coupling agent, in a ratio of coupling agent to lithium of from 2 to 10, a multiester of formula ##STR1## where X is the radical of a polyhydroxy compound having from 2 to 6 hydroxy groups, and n is an integer equal to the number of hydroxy groups in the polyhydroxy compound, whereby a star-block polymer having from 3 to 20 arms per molecule is formed.

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