Base rubber containing 70-100 wt % of styrene-butadiene rubber whose glass transition temperature (Tg) is higher than 33 C. and less than 10 C., a vulcanizing agent, and compounding agents added to the base rubber as necessary are kneaded. A mixture obtained by kneading them is put in a forming die....http://www.google.fr/patents/US6335392?utm_source=gb-gplus-shareBrevet US6335392 - Outsole of shoes
