Block copolymers of monovinylarenes and conjugated dienes and preparation thereof

A monovinylarene/conjugated diene block copolymer comprising;

• about 55 to about 95 weight percent polymerized monovinylarene based on the total weight of said copolymer and about 5 to about 45 weight percent polymerized conjugated diene based on the total weight of said copolymer;
• said copolymer having polymer chains which result from coupling block copolymer chains
• ______________________________________ S.sub.1 --S.sub.2 --S.sub.3 --B.sub.1 /S.sub.4 --Li.sub.2 S.sub.2 --S.sub.3 --B.sub.1 /S.sub.4 --Li.sub.2 S.sub.3 --B.sub.1 /S.sub.4 --Li.sub.3 ______________________________________
• wherein
• S=monovinylarene block
• B=conjugated diene block
• B/S=tapered block of conjugated diene and monovinylarene
• Li=living polymer site or coupling site.

A monovinylarene/conjugated diene block copolymer comprising;

• about 55 to about 95 weight percent polymerized monovinylarene based on the total weight of said copolymer and about 5 to about 45 weight percent polymerized conjugated diene based on the total weight of said copolymer;
• said copolymer having polymer chains which result from coupling block copolymer chains
• ______________________________________ S.sub.1 --S.sub.2 --S.sub.3 --B.sub.1 /S.sub.4 --B.sub.2 /S.sub.5 --Li.sub.1 S.sub.2 --S.sub.3 --B.sub.1 /S.sub.4 --B.sub.2 /S.sub.5 --Li.sub.2 1 S.sub.3 --B.sub.1 /S.sub.4 --B.sub.2 /S.sub.5 --Li.sub.3 ______________________________________
• wherein
• S=monovinylarene block
• B=conjugated diene block
• B/S=tapered block of conjugated diene and monovinylarene
• Li=living polymer site or coupling site.

A monovinylarene/conjugated diene block copolymer comprising;

• about 55 to about 95 weight percent polymerized monovinylarene based on the total weight of said copolymer and about 5 to about 45 weight percent polymerized conjugated diene based on the total weight of said copolymer;
• said copolymer having polymer chains which result from coupling block copolymer chains
• ______________________________________ S.sub.1 --S.sub.2 --S.sub.3 --S.sub.4 --B.sub.1 --Li.sub.1 S.sub.2 --S.sub.3 --S.sub.4 --B.sub.1 --Li.sub.2 S.sub.3 --S.sub.4 --B.sub.1 --Li.sub.3 ______________________________________
• wherein
• S=monovinylarene block
• B=conjugated diene block
• Li=living polymer site or coupling site.