| 摘要 |
The present invention includes compositions suitable for air barriers such a s innerliners where adhesion to tire carcass materials (e.g., SBR) and flexibility are desirable, as well as low air permeability. The invention includes a tire innerliner made by combining a filler; a sulfur cure system; optionally at least one secondary rubber; and at least one halogenated terpolymer of C4 to C8 isoolefin derived units, C4 to C14 multiolefin derive d units, and p-alkylstyrene derived units. Examples of suitable fillers includ e modified carbon black, carbon black, silica, exfoliated clays, and combinations thereof. The present invention also includes a method of producing an elastomeric terpolymer composition comprising combining in a 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 o r tertiary halogenated compounds such as, for example, t-butychloride, 2-acety l- 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-2propyl)benzene (tri(cumylchloride)); the aliphatic halides, particularly the chlorides, suc h as, for example, 2-chloro-2,4,4-trimethylpentane (TMPCI), and 2-bromo-2,4,4- trimethylpentane (TMPBr).
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