| http://www.w3.org/ns/prov#value | - Commercially available elastomeric A-B-A' block copolymers having a saturated or essentially saturated poly(ethylene-butylene) midblock B represented by the formula: ##STR4## where x, y and n are positive integers and polystyrene endblocks A and A' each represented by the formula: ##STR5## where n is a positive integer which may be of the same or a different integer for the A and A' endblock
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