3902 Polymers of Propylene or of Other Olefins, in Primary Forms

3902 (01/1988-..) Polymers of Propylene or of Other Olefins, in Primary Forms 39021000 (01/1988-..) Polypropylene, in Primary Forms 39022000 (01/1988-..) Polyisobutylene, in Primary Forms 39023000 (01/1988-..) Propylene Copolymers, in Primary Forms 39029000 (01/1988-12/1996) Polymers of Propylene or Other Olefins, in Primary Forms (Excl. Polypropylene, Polyisobutylene and Propylene Copolymers) 39029010 (01/1997-..) A-B-A BLOCK COPOLYMER OF PROPYLENE OR OF OTHER OLEFINS, OF POLYSTYRENE, ETHYLENE-BUTYLENE COPOLYMER AND POLYSTYRENE, CONTAINING BY WEIGHT <= 35% OF STYRENE, IN BLOCKS OF IRREGULAR SHAPE, LUMPS, POWDERS, GRANULES, FLAKES AND SIMILAR BULK FORMS 39029020 (01/1997-..) Polybut-1-ene, a Copolymer of But-1-ene With Ethylene Containing by Weight <= 10% of Ethylene, or a Blend of Polybut-1-ene With Polyethylene And/or Polypropylene Containing by Weight <= 10% of Polyethylene And/or <= 25% of Polypropylene, in Blocks of IrrEgular Shape, Lumps, Powders, Granules, Flakes and Similar Bulk Forms 39029090 (01/1997-..) Polymers of Propylene or of Other Olefins, in Primary Forms (Excl. Polypropylene, Polyisobutylene, Propylene Copolymers, and a A-b-a Block Copolymer of Polystyrene, Ethylene-butylene Copolymer and Polystyrene, Containing by Weight <= 35% of Styrene and POlybut-1-ene, a Copolymer of But-1-ene With Ethylene Containing by Weight <= 10% of Ethylene, or a Blend of Polybut-1-ene With Polyethylene And/or Polypropylene Containing by Weight <= 10% of Polyethylene And/or <= 25% of Polypropylene, in Blocks of IrregUlar Shape, Lumps, Powders, Granules, Flakes and Similar Bulk Forms)