Abstract: The present invention relates to improved catalyst compositions used in the formation of substantially gel-free copolymers and terpolymers of isobutylene and one or more dienes having an Mn of about less than 500,000, a mole % unsaturation of about 8 to about 45, and a polydispersity value of about 3 to about 30, wherein the mixture of isobutylene and diene monomers and a cosolvent are contacted with the catalyst composition at polymerization conditions (-50.degree. to -100.degree. C.) wherein the improvement includes the hydrocarbon soluble catalyst composition being formed from the reaction product of a material of the formula:R.sub.m AlX.sub.

Abstract: The present invention relates to improved catalyst compositions used in the formation of substantially gel-free copolymers and terpolymers of isobutylene and one or more dienes having an Mn of about less than 500,000, a mole % unsaturation of about 0.1 to about 45, and a polydispersity value of about 2.5 to about 30, wherein the mixture of isobutylene and diene monomers and a cosolvent are contacted with the catalyst composition at polymerization conditions (0.degree. C. to -100.degree. C.) wherein the improvement includes the hydrocarbon soluble catalyst composition being formed from the reaction product of a material of the formula:R.sub.m AlX.sub.

Abstract: The present invention relates to an improved solution process for the formation of substantially gel-free copolymers and terpolymers of isobutylene and one or more dienes having an Mn of about less than 500,000, a mole % unsaturation of about 8 to about 45, and a polydispersity value of about 3 to about 30, wherein the mixture of isobutylene and diene monomers and a cosolvent are contacted with a catalyst at polymerization conditions (-50.degree. -to 100.degree. C.) wherein the improvement includes a hydrocarbon soluble catalyst being formed from the reaction product of a material of the formula:R.sub.m AlX.sub.

Abstract: In a process for producing substantially gel free elastomers of isobutylene and a conjugated diene selected from the group consisting of cyclopentadiene, methylcyclopentadiene, isoprene or piperylene and mixtures thereof, improved products, higher catalyst efficiency, high cement concentrations and improved monomer conversions are obtained by the use of staged, or multiple reactors whereby the monomers and/or catalyst feeds may be divided among the reaction zones. The process provides elastomers which are substantially gel free having controlled molecular weight distribution (polydispersity) and high molecular weights at about 8 to about 45 mole % unsaturation.