Kraton Polymers LLC

Kato Hiroshi

Martine Dupont

Marianne Stol

Koen Van Duin

Neil Riddle

Xavier D D J Muyldermans

A styrenic block copolymer having one or more polymer blocks A and one or more polymer blocks B is disclosed, where 'A' is a poly(vinylaromatic) block having a molecular weight of greater than 5 kg/mol. The 'B' block has a molecular weight of more than 15 kg/mol, and comprises polymerized 1,3-diene units and vinylaromatic units, wherein the polymerized vinylaromatic units represent 5-40 wt. % of the overall weight of the block &#x201c;B&#x201d;. The polymerized 1,3-diene units comprise more than 80 wt. % of polymerized isoprene units in which 45-80 mol % are 1,4-isoprene addition units. The blocks &#x201c;A&#x201d; and &#x201c;B&#x201d; represent from &#x3e;5 to &#x3c;40 wt. %, and &#x3e;33 to &#x3c;95 wt. %, respectively, relative to the overall weight of the block copolymer. The polymers have physical properties that make them valuable, e.g., as vibration damping materials.

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Tokyo, Japan

Kato Hiroshi