| 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: ##STR2## where x, y and n are positive integers and polystyrene end blocks A and A' represented by the formula: ##STR3## where n is a positive integer which may be the same or different integer for A and A', are sometimes referred
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