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A reaction flask is dried and charged with 600 parts by volume hexanes and 3.0 parts AlCl3. The system is flushed with N2. This mixture is stirred then cooled to 0° C. This temperature is maintained throughout the entire reaction. Addition of monomers (isobutylene rate=5.6 parts/min; isoprene rate=1.0 part by volume/min) is begun. The isobutylene is condensed with a Dry Ice/acetone cold finger. After 1 hr. an additional 200 parts by volume hexanes are added and the above conditions are maintained for an additional 1 hr. At the end of the second hour 1.0 part AlCl3 is charged into the reaction flask along with 400 parts, by volume hexanes which are added dropwise over the next hour. This is repeated every 60 minutes for a total of 625 minutes, the total time required to add 3500 parts isobutylene and 625 parts by volume (425 parts by weight) isoprene. The total AlCl3 added is 10 parts.

1. customA reaction flask is dried
2. additioncharged with 600 parts by volume hexanes and 3.0 parts AlCl3
3. customThe system is flushed with N2
4. temperatureThis temperature is maintained throughout the entire reaction
5. additionAddition of monomers (isobutylene rate=5.6 parts/min; isoprene rate=1.0 part by volume/min)
6. customcondensed with a Dry Ice/acetone cold finger
7. temperaturethe above conditions are maintained for an additional 1 hr
8. additionare added dropwise over the next hour
9. waitThis is repeated every 60 minutes for a total of 625 minutes