| http://www.w3.org/ns/prov#value | - ly employed, or a blend of cis-polybutadiene with other elastomers may also be utilized. [0099] The crosslinking agent of the core composition is the reaction product of an unsaturated carboxylic acid or acids and an oxide or carbonate of a metal such as zinc, magnesium, barium, calcium, lithium, sodium, potassium, cadmium, lead, tin, and the like.
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