Polymerisation process

A process is disclosed for preparing a composition comprising a polymer (A) of ethylene and a copolymer (B) of ethylene and 1-pentene, wherein ethylene, a catalyst derived from a transition metal selected from groups IIIB, IVB, VB and VIB, hexane diluent and optionally a co-catalyst are introduced i...

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Bibliographic Details
Main Author FREDERICH, ANDRE
Format Patent
LanguageEnglish
French
German
Published 02.03.2005
Edition7
Subjects
CHEMISTRY
COMPOSITIONS BASED THEREON
COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
MACROMOLECULAR COMPOUNDS OBTAINED BY REACTIONS ONLY INVOLVINGCARBON-TO-CARBON UNSATURATED BONDS
METALLURGY
ORGANIC MACROMOLECULAR COMPOUNDS
THEIR PREPARATION OR CHEMICAL WORKING-UP
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Summary:A process is disclosed for preparing a composition comprising a polymer (A) of ethylene and a copolymer (B) of ethylene and 1-pentene, wherein ethylene, a catalyst derived from a transition metal selected from groups IIIB, IVB, VB and VIB, hexane diluent and optionally a co-catalyst are introduced into a first reactor where polymerisation of the ethylene is carried out, and then the mixture comprising polymer, catalyst and cocatalyst is removed from the first reactor and introduced into a further reactor together with additional ethylene where polymerisation is carried out in a hexane diluent to form further polymer, characterised in that 1-pentene is introduced into one of the reactors so as to form copolymer (B) in that reactor, and ethylene polymer (A) is formed in the other reactor, the weight ratio of the two polymers being from 30:70 to 70:30, ethylene polymer (A) having an intrinsic viscosity eta A (measured in tetrahydronaphthalene at 160 DEG C) of 0.4 to 1.5 dl/g, and the ethylene/1-pentene copolymer (B) having an having an intrinsic viscosity eta B of 2.2 to 6.5 dl/g.
Bibliography:Application Number: EP20040253296