Abstract: The present invention relates to articles prepared from novel anionic block copolymers of mono alkenyl arenes and conjugated dienes, and to blends of such block copolymers with other polymers. The block copolymers have mono alkenyl arene end blocks and controlled distribution blocks of mono alkenyl arenes and conjugated dienes. The block copolymer may be blended with at least one other polymer selected from the group consisting of olefin polymers, styrene polymers, amorphous resins and engineering thermoplastic resins.

Abstract: Block copolymer compositions, comprising for a major part of linear triblock copolymers, comprising two terminal predominantly poly(monovinylaromatic) blocks having a real molecular weight in the range of from 5,000 to 25,000 and one predominantly poly(boutadiene) midblock, said triblock copolymer having a monovinylaromafic content in the range of from 10 to 55 wt %, an apparent total molecular weight in the range of from 15,000 to 300,000, and an amount of from 0 to 40 wt % of a diblock copolymer relative to the total block copolymer composition weight, containing a predominantly poly(monovinylaromatic) block and a predominantly poly(boutadiene) block similar to those of the triblock copolymer component; said block copolymer composition having a free poly(vinylaromatic) content of at most 7 wt %, and shaped articles derived from said block copolymer composition.