| http://www.w3.org/ns/prov#value | - Copolymers of mono- and diolefins, for example ethylene-propylene copolymers, propylene-butene-1 copolymers, propylene-isobutylene copolymers, ethylene-butene-1 copolymers, and also terpolymers of ethylene with propylene and a diene, such as hexadiene, dicyclopentadiene or ethylidene norboxnene. 4.
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