Patent ID: 6162874
Filing Date: 2000-12-19
Classification: C08F,C08L

Abstract:
A process for producing a blend of a vinyl aromatic block polymer and a vinyl aromatic polymer, comprising:a) providing a living, anionically-initiated A--B block polymer wherein the A block is derived from at least one vinyl aromatic monomer and the B block is derived from at least one conjugated diene monomer, the A block being formed prior to the B block;b) concurrently forming within one reaction zone, via anionic polymerization of additional at least one vinyl aromatic monomer, a second A block on the living A--B block polymer, thereby forming a living A--B--A block polymer, and a living vinyl aromatic polymer derived from the same at least one vinyl aromatic monomer as the second A block;c) immediately terminating within the same reaction zone the living A--B--A block polymer and the living vinyl aromatic polymer; andd) recovering the resultant blend of vinyl aromatic A--B--A block polymer and vinyl aromatic polymer.