| 摘要 |
<p>PURPOSE:To obtain the title copolymer which is narrow in both MW distribution and composition distribution and can give a composition excellent in transparency, surface nonstickiness, impact resistance, heat sealability, etc., by copolymerizing ethylene with a 3-20C alpha-olefin. CONSTITUTION:Ethylene (A) is copolymerized with a 3-20C alpha-olefin (B) at -50-200 deg.C in the presence of a catalyst comprising a zirconium hydride compound in which the ligand is a group containing conjugated pi electrons [e.g., bis(cyclopentadienyl)zirconium monochloride hydride] and an aluminooxane of formula I or II (wherein R is a hydrocarbon group and M>=20). In this way, the title copolymer containing 35-85wt% component A and 65-15wt% component B, having an intrinsic viscosity of 0.5-10dl/g (in decalin at 135 deg.C), a MW distribution <=2.5 (GPC), a crystallinity <=30% and a boiling methyl acetate- soluble portion <=2wt% and satisfying the relationship: 1.05<=B<=2 (wherein B is a value of formula III, wherein PE is the molar fraction of component A in the copolymer, PO is the molar fraction of component B and POE is the molar fraction of A-B chains in the total dyad chains) is obtained.</p> |
