| abstract |
A crystalline polypylene composition comprises a blend of (a) crystalline polypropylene homo- or random or block co-polymer of propylene and (b) 0.005 to 10,000 ppm by wt. of a polymer of a vinyl cycloalkane having at least 6 C atoms, e.g. vinyl cyclopentane or cyclohexane.The propylene may be copolymerized with up to 50 mot% of another C2-18 a-olefin. The cycloalkane may be copolymerized with up to 20 mol% of another vinyl cycloalkane or an a-olefin. Both polymers may be produced using a Ti compound and organoaluminium compound as catalyst system.Additives can be present; the composition can be molded, e.g. to form a sheet.The composition has good optical transparency and rigidity. |