Patent ID: 6444755
Filing Date: 2002-09-03
Classification: C08F,C08L

Abstract:
A polymer blend comprising a coupled conjugated diene/monovinylarene block copolymer and a styrenic polymer; wherein said coupled conjugated diene/monovinylarene block copolymer is produced by the process comprising: sequentially contacting under polymerization conditions at least one monovinylarene monomer, an organomonoalkali metal initiator, at least one conjugated diene monomer, and thereafter coupling with a polyfunctional coupling agent to form the block copolymer; wherein at least three consecutive monomer mixture charges containing monovinlyarene monomer and conjugated diene monomer are provided to produce at least three consecutive conjugated diene/monovinylarene tapered blocks in the block copolymer, wherein all the monovinylarene monomer and conjugated diene monomer contained in each charge is added at the beginning of the charge allowing excess monomer to be present in the reactor, wherein the at least one monovinylarene monomer contains from 8 to 18 carbon atoms; and wherein the at least one conjugated diene monomer contains from 4 to 12 carbon atoms.