Processes for making polyisobutylene compositions

A method of making a polymer composition, comprising:

• flowing a catalyst system and a feedstock into a reactor to form a reaction mixture comprising the feedstock and the catalyst system, the feedstock comprising isobutylene, the catalyst system comprising:
• a) a support material selected from the group consisting of Al2O3, ZrO2, TiO2, SnO2, CeO2, SiO2, SiO2/Al2O3, and combinations thereof;
• and
• (b) BF3, wherein a concentration of BF3 is greater than about 30 wt %, based on a total weight of the catalyst system;
• contacting the isobutylene with the catalyst system, wherein contacting the isobutylene with the catalyst system comprises maintaining a temperature of the reaction mixture between about −35° C. and about 100° C.;
• and
• obtaining the polymer composition.

A method of making a polymer composition, comprising:

• forming a reaction mixture comprising a feedstock and a catalyst system, the feedstock comprising isobutylene, the catalyst system comprising:
• a) a support material selected from the group consisting of Al2O3, ZrO2, TiO2, SnO2, CeO2, SiO2, SiO2/Al2O3, and combinations thereof;
• and
• (b) BF3, wherein a concentration of BF3 is greater than about 30 wt % based on a total weight of the catalyst system;
• contacting the isobutylene with the catalyst system;
• and
• obtaining the polymer composition,
• wherein the polymer composition comprises a polyisobutylene having a Mn of about 320 daltons to about 10,000 daltons, the polyisobutylene comprising a first portion comprising polymer chains having alpha vinylidene groups, and one or more of a second portion comprising polymer chains having beta vinylidene groups and a third portion comprising polymer chains having internal vinylidene groups, and wherein:
• the first portion is greater than about 75 wt % based on a total weight of the polymer composition, and
• a total content of the second portion plus the third portion is less than about 25 wt % based on the total weight of the polymer composition.