prov:value
| - (f) polyolefins, for example polyethylene, polypropylene, polybutylene, polyisobutylene, polyisoprene, substituted polyolefins, halogenated polyolefins and copolymers thereof, such as ethylene and vinyl acetate copolymers and other synthetic resins based on unsaturated hydrocarbons, for example low-molecular polystyrenes, and especially the polyolefins of average degree of polymerisation, preferab
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