| abstract |
A process is disclosed for preparing a composition comprising a polymer (A) ofnethylene and a copolymer (B) of ethylene and 1-pentene, wherein ethylene, a catalystnderived from a transition metal selected from groups IIIB, IVB, VB and VIB, hexanendiluent and optionally a co-catalyst are introduced into a first reactor wherenpolymerisation of the ethylene is carried out, and then the mixture comprising polymer,ncatalyst and cocatalyst is removed from the first reactor and introduced into a furthernreactor together with additional ethylene where polymerisation is carried out in a hexanendiluent to form further polymer, characterised in that 1-pentene is introduced into one ofnthe reactors so as to form copolymer (B) in that reactor, and ethylene polymer (A) isnformed in the other reactor, the weight ratio of the two polymers being from 30:70 ton70:30, ethylene polymer (A) having an intrinsic viscosity η A (measured inntetrahydronaphthalene at 160°C) of 0.4 to 1.5 dl/g, and the ethylene/1-pentenencopolymer (B) having an having an intrinsic viscosity η B of 2.2 to 6.5 dl/g. |