Patent ID: 7799871

Claim:
A 1-butene polymers composition comprising: a) from 5% by weight to 95% by weight of an atactic 1-butene-based polymer selected from an atactic homopolymer of 1-butene or an atactic copolymer of 1-butene containing up to 50% by mol of at least one alpha olefin selected from ethylene, propylene and alpha olefins of formula CH 2 ═CHZ, wherein Z is a C 3 -C 10 alkyl group, component a) comprising: i) a distribution of molecular weight Mw/Mn no greater than 4; ii) rr triads, measured by 13 C-NMR comprised between 5% and 50%; iii) no enthalpy of fusion detectable at a differential scanning calorimeter (DSC); iv) an intrinsic viscosity (IV) measured in tetrahydronaphtalene (THN) at 135° C. comprised between 1.0 dl/g and 5.0 dl/g; and v) an infrared crystallinity lower than 0.5%; and b) from 5% by weight to 95% by weight of an isotactic 1-butene-based polymer selected from isotactic homopolymer of 1-butene, isotactic copolymer of 1-butene containing up to 5% by mol of ethylene derived units, isotactic copolymer of 1-butene containing up to 50% by mol of propylene derived units or an isotactic copolymer of 1-butene and at least one alpha olefin of formula CH 2 ═CHZ, wherein Z is a C 3 -C 10 alkyl group, containing up to 20% by mol of derived units of said alpha-olefins, component b) comprising: i) isotactic pentads (mmmm) measured by 13 C-NMR, higher than 80%; ii) a melting point higher than 80° C.; and iii) an intrinsic viscosity (IV) measured in tetrahydronaphtalene (THN) at 135° C. comprised between 0.1 dl/g and 5 dl/g.