Halogenated isoolefin based terpolymers

摘要

The present invention includes an isobutylene based terpolymer suitable for air barriers such as innerliners where adhesion to tire carcass materials (e.g., SBR) and flexibility are desirable, as well as low air permeability. The terpolymer in one embodiment is a halogenated terpolymer of C₄ to C₈ isoolefin derived units, C₄ to C₁₄ multiolefin derived units, and p-alkylstyrene derived units. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a polar diluent C₄ to C₈ isoolefin monomers, C₄ to C₁₄ multiolefin monomers, and p-alkylstyrene monomers in the presence of a Lewis acid and at least one initiator to produce the terpolymer. Examples of suitable initiators include cumyl compounds and or halogenated organic compounds, especially secondary or tertiary halogenated compounds such as, for example, t-butylchloride, 2-acetyl-2-phenylpropane (cumyl acetate), 2-methoxy-2-phenyl propane (cumylmethyl-ether), 1,4-di(2-methoxy-2-propyl)benzene (di(cumylmethyl ether)); the cumyl halides, particularly the chlorides, such as, for example 2-chloro-2-phenylpropane, cumyl chloride (1-chloro-1-methylethyl)benzene), 1,4-di(2-chloro-2-propyl)benzene (di(cumylchloride)), and 1,3,5-tri(2-chloro-2-propyl)benzene (tri(cumylchloride)); the aliphatic halides, particularly the chlorides, such as, for example, 2-chloro-2,4,4-trimethylpentane (TMPCI), and 2-bromo-2,4,4-trimethylpentane (TMPBr).