Thermoplastic elastomers

Details Thermoplastic elastomers Thermoplastic elastomers

C - Chemistry, Metallurgy

08

F

400/2040

C08F 297/00 (2006.01)

Patent

CA 1324452

ABSTRACT OF THE INVENTION A polymerization process for preparing triblock copolymers and multiblock copolymers. The process includes the polymerization of isobut- ylene below about -40°C in a reaction mixture which includes a titanium halide, a mixed solvent, and an initiator compound selected from the group consisting of cumyl ester and cumyl ether com- pounds. In at least some instances, the compo- nents are added in a particular order, sometimes together with a moisture scavenger. After forma- tion of the polyisobutylene, a diene is added to the mixture containing the polyisobutylene and polymerized to form the desired copolymer. The diene portion of the copolymer may subsequently be cyclized to produce a copolymer exhibiting both thermoplastic and elastomeric properties. If desired the block copolymers can be subsequently modified to include functional side groups, or to provide photocuring capabilities.

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