| prov:value
| - If, in addition to the rubber phase, one or more hard components (having glass transition temperatures of more than 20??? C.), are present in the elastomer, these hard components are generally prepared by polymerization of styrene, acrylonitrile, methacrylonitrile, ??-methylstyrene p-methylstyrene, acrylates and methacrylates, such as methyl acrylate, ethyl acrylate and methyl methacrylate, as pri
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