| http://www.w3.org/ns/prov#value | - Preferred isoolefin copolymers useful as elastomers herein may be characterized as interpolymers containing the following monomer units randomly spaced along the polymer chain: wherein R and R1 are independently hydrogen, lower alkyl, preferably C1 to C7 alkyl and primary or secondary alkyl halides and X is a functional group such as halogen.
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