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
Polibut-1-en, kopolimer but-1-ena z etilenom