Patent ID: 6110880
Filing Date: 2000-08-29
Classification: C08F,C10M,C10N

Abstract:
A viscosity modifier comprising a block copolymer including A blocks and B blocks, wherein said A blocks comprise at least about 93 wt. % ethylene and said B blocks comprise a copolymer of between about 40 wt. % to 85 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. %; and wherein said viscosity modifier exhibits the following properties: at a thickening efficiency of 2.3, a Kurt Orbahn Shear Stability of less than about 25%; and at a thickening efficiency of 3.5, a Kurt Orbahn Shear Stability of less than about 35%.