Patent ID: 8097679

Claim:
A 1-butene polymer composition comprising: a) from 10% to 90% by weight of an isotactic 1-butene homopolymer or a copolymer of 1-butene and ethylene containing from 0 to 3% by mol of ethylene derived units and/or a copolymer of 1-butene and propylene containing from 0 to 15% by mol derived units, having the following features: i) isotactic pentad (mmmm) measured by 13 C-NMR, higher than 90%; ii) melting point (TmII) higher than 90° C.; and iii) intrinsic viscosity (IV) measured in tetrahydronaphthalene (THN) at 135° C. is between 0.5 dl/g and 5.0 dl/g; b) from 90% to 10% by weight of a copolymer of 1-butene and at least a C 8 -C 12 alpha-olefin derived units, containing from 0% to 10% by mole of propylene or pentene derived units, and/or containing from 0% to 5% by mole of ethylene derived units having a content of C 8 -C 12 alpha-olefin derived units higher than 4.0% by mol and lower than 20.0% by mol; endowed with the following features: i) isotactic pentad mmmm higher than or equal to 90%; pentads (mmrr+mrrm) lower than 4% and pentad rmmr not detectable by 13 C NMR, ii) intrinsic viscosity (IV) measured in tetrahydronaphthalene at 135° C. is between 0.8 and 5.0 dL/g; iii) the melting point measured by DSC (TmI) and the C 8 -C 12 alpha-olefin content fulfill the following relationship: TmI< 130 ×C −0.3 wherein C is the molar content of C 8 -C 12 alpha-olefin derived units and TmI is the highest melting peak in the first melting transition measured by DSC on a compression moulded plaque aged for 10 minutes in an autoclave at 2000 bar at room temperature and then aged for at least 24 hours at 23° C.; otherwise the melting point TmI is not detectable.