Mid-range vinylidene content, high viscosity polyisobutylene polymers

A mid-range vinylidene content, high viscosity PIB polymer composition comprising PIB molecules, wherein a first portion of said PIB molecules have alpha position double bonds and a second portion of said PIB molecules have beta position double bonds, wherein said first and second portions together include at least 80 mole % of the PIB molecules of the composition, wherein said first portion includes less than 75 mole % of the PIB molecules of the composition, and wherein no more than 10 mole % of the PIB molecules of the composition have tetra-substituted double bonds, said composition having a polydispersity of no more than 2.8;

• and being further characterized in that the composition has a kinematic viscosity as measured at 100° C. in accordance with Test Method ASTM D 445 in the range of 3000 cSt to 3700 cSt, a number average molecular weight, Mn, in the range of 2800 Daltons to 4000 Daltons and a ratio Mn:PDI of greater than 1100.

A mid-range vinylidene content, high viscosity PIB polymer composition comprising PIB molecules, wherein a first portion of said PIB molecules have alpha position double bonds and a second portion of said PIB molecules have beta position double bonds, wherein said first and second portions together include at least 80 mole % of the PIB molecules of the composition, wherein said first portion includes less than 75 mole % of the PIB molecules of the composition, and wherein no more than 10 mole % of the PIB molecules of the composition have tetra-substituted double bonds, said composition having a polydispersity of no more than 2.7;

• and being further characterized in that the composition has a kinematic viscosity as measured at 100° C. in accordance with Test Method ASTM D 445 in the range of 3750 cSt to 5000 cSt, a number average molecular weight, Mn, in the range of 3000 Daltons to 3800 Daltons and a ratio of Mn:PDI of greater than 1200.