The selectively hydrogenated block copolymers of {TAIL ~ this invention} contain sufficient unsaturation in the terminal D blocks so that they may be adequately vulcanized to provide near network perfection with the resulting superior mechanical properties at both room and elevated temperatures, while, as stated, the substantially complete lack of ethylenic unsaturation in {HEAD ~ the interior} I blocks provides for a high degree of oxidative and thermal stability 
The selectively hydrogenated block copolymers of { TAIL ~ this invention } contain sufficient unsaturation in the terminal D blocks so that they may be adequately vulcanized to provide near network perfection with the resulting superior mechanical properties at both room and elevated temperatures , while , as stated , the substantially complete lack of ethylenic unsaturation in { HEAD ~ the interior } I blocks provides for a high degree of oxidative and thermal stability
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