| http://www.w3.org/ns/prov#value | - In a kneading process for the preparation of the rubber composition, ??- or ??-ethylenic unsaturated carboxylic acid and a metal oxide such as zinc oxide may be reacted with each other to form the metallic salt of ??- or ??-ethylenic unsaturated carboxylic acid as the vulcanizing agent.
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