C - Chemistry – Metallurgy – 08 – F
Patent
C - Chemistry, Metallurgy
08
F
C08F 110/02 (2006.01)
Patent
CA 2562925
Polyethylene which comprises ethylene homopolymers and copolymers of ethylene with a-olefins and has a molar mass distribution width MW/M~ of from 6 to 100, a density of from 0.89 to 0.97 g/cm3, a weight average molar mass MM, of from 5000 g/mol to 700 000 g/mol and has from 0.01 to 20 branches/1000 carbon atoms and at least 0.5 vinyl groups/I 000 carbon atoms, wherein the 5-50% by weight of the polyethylene having the lowest molar masses have a degree of branching of less than 10 branches/1000 carbon atoms and the 5-50% by weight of the polyethylene having the highest molar masses have a degree of branching of more than 2 branches/1000 carbon atoms, a process for its preparation, catalysts suitable for its preparation and also fibers, moldings, films or polymer blends in which this polyethylene is present.
Ce polyéthylène comprend des homopolymères d'éthylène et des copolymères d'éthylène avec des .alpha.-oléfines. Sa plage de distribution de la masse molaire (M¿w?/M¿n?) est comprise entre 6 et 100. Sa densité est comprise entre 0,89 et 0,97 g/cm?3¿. Sa masse molaire moyenne en poids (M¿w?) se situe entre 5.000 et 700.000 g/mol. On a de 0,01 à 20 ramifications par 1.000 atomes de carbone et au moins 0,5 groupes vinyle par 1.000 atomes de carbone. En outre, 5 % à 50 % de la masse du polyéthylène de masse molaire inférieure présente un degré de ramification inférieur au 10 ramifications par 1.000 atomes de carbone, et les 5 % à 50 % de la masse du polyéthylène de masse molaire supérieure un degré de ramification de plus de 2 ramifications par 1.000 atomes de carbone. L'invention concerne également un procédé d'élaboration correspondant, des catalyseurs permettant cette élaboration, mais aussi des fibres, des moulages, des films ou des mélanges de polymères dans lesquels ce polyéthylène est présent.
Basell Polyolefine Gmbh
Osler Hoskin & Harcourt Llp
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