Patent ID: 7408005
Filing Date: 2008-08-05
Classification: C08C,C08F

Abstract:
1. The polymer particles made by a process which comprises polymerizing a conjugated diolefin monomer by anionic polymerization in an organic solvent, wherein the anionic polymerization is initiated with a hairless core initiator; wherein the hairless core initiator is made by (1) polymerizing a vinyl aromatic monomer by emulsion polymerization in an aqueous medium to produce core particles, wherein the polymerization of the vinyl aromatic monomer is initiated with a free radical generator, (2) recovering the core particles from the aqueous medium, (3) dispersing the core particles in an organic solvent, and (4) adding an organo-lithium compound to the core particles in the organic solvent to produce the hairless core initiator.