Polymers of propylene or of other olefins, in primary forms

390210 Propylene, other olefin polymers; polypropylene in primary forms 390220 Propylene, other olefin polymers; polyisobutylene in primary forms 390230 Propylene, other olefin polymers; propylene copolymers in primary forms 390290 Propylene, other olefin polymers; n.e.c. in heading no. 3902, in primary forms