Patent ID: 7985799

Claim:
A process for preparing polyolefin blends comprising: polymerizing in a solution phase propylene or 1-butene, optionally in presence of α-olefin comonomers of formula CH 2 ═CHR, wherein R is hydrogen or a hydrocarbon radical comprising 1-8 carbon atoms, to prepare a polymeric solution comprising a semicrystalline polymer component; polymerizing in a solution phase 1-hexene or 1-octene, optionally in presence of α-olefin comonomers of formula CH 2 ═CHR, wherein R is hydrogen or a hydrocarbon radical comprising 1-8 carbon atoms, the α-olefin being present in an amount up to 50% by weight based on the 1-hexene or 1-octene, to prepare a polymeric solution comprising a completely amorphous polymer component; mixing the polymeric solution comprising the semicrystalline polymer component and the polymeric solution comprising the completely amorphous polymer component to form a mixture; and subjecting the mixture to a devolatilization, step to separate a polyolefin blend comprising the semicrystalline component and the amorphous component from volatile components; wherein the polymeric solution comprising the semicrystalline polymer component and the polymeric solution comprising the completely amorphous component are simultaneously prepared in two polymerization reactors connected in parallel, and then respectively transferred from each reactor to the mixing step.