| 摘要 |
A copolymer of 1-butene and at least a C8-C12 alpha-olefin derived units, having a content of C8-C12 alpha-olefin derived units equal to or higher than 7.2% and lower than 20.0% by mole; endowed with the following features: a) no detectable melting point TmII as the highest melting peak in the second melting transition; b) intrinsic viscosity (IV) measured in tetraline at 135° C. comprised between 0.8 and 5.0 dL/g; c) isotactic pentad mmmm higher than or equal to 90%; pentads (mmrr+mrrm) lower than 4 and pentad rmmr not detectable at 13C NMR; d) the tensile modulus (TM) measured with DMTA in MPa and the comonomer content fulfill the following relationship: TM<−14×C+200 wherein C is the molar content of the C8- C12 alpha-olefin derived units; e) the tension set at 100% of deformation is lower than 55%; and f) the melting point measured by DSC (TmI) and the C8-C12 alpha-olefin content fulfill the following relationship: TmI<−0.20×C+70 wherein C is the molar content of C8-C12 alpha-olefin derived units and TmI is the highest melting peak in the first melting transition; otherwise the melting point TmI is not detectable by DSC. |
