| http://www.w3.org/ns/prov#value | - The carbon black is preferably present in an amount in the range of from 20 to 120 parts by weight, calculated on 100 parts by weight of the sum of copolymer A and polymer B. Sulphur is preferably present in an amount in the range of from 0.5 to 5 parts by weight, calculated on 100 parts by weight of the sum of copolymer A and polymer B. Other examples of vulcanizing agents are 4,4'-dithiomorpholi
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