Polyolefin block copolymer viscosity modifier

Details Polyolefin block copolymer viscosity modifier Polyolefin block copolymer viscosity modifier

C - Chemistry, Metallurgy

08

F

C08F 297/08 (2006.01) C08F 10/00 (2006.01) C08F 110/00 (2006.01) C08F 210/00 (2006.01) C10M 143/02 (2006.01) C10M 143/04 (2006.01) C08F 210/16 (2006.01) C08F 210/18 (2006.01)

Patent

CA 2289540

A viscosity modifier comprising a low molecular weight block copolymer including A blocks and B blocks, wherein the A blocks comprise at least about 93 wt.% polyethylene and the B blocks comprise a copolymer of between about 40 wt.% to 75 wt.% ethylene and at least one other .alpha.-olefin; wherein the resulting block copolymer has an average ethylene content of between about 60 wt.% to 80 wt.%.

Cet agent de modification de la viscosité comporte un copolymère séquencé de faible poids moléculaire comportant des séquences A et B. Les séquences A comprennent au moins 93 % environ en poids de polyéthylène et les séquences B un copolymère renfermant entre environ 40 et 75 % en poids d'éthylène et au moins une autre oléfine- alpha . La concentration moyenne en éthylène du copolymère séquencé résultant est comprise entre 60 et 80 % en poids.

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