Curing systems for compositions containing halogenated copolymers of isobutylene and para-methylstrene
AssigneeExxon Chemical Patents Inc.
InventorKevin O'Donnell
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Abstract
The present invention provides for sulfur curable compositions containing a halogenated copolymer of a C.sub.4 to C.sub.7 isomonoolefin, e.g., isobutylene and a para-alkylstyrene, e.g., para-methylstyrene, and further containing a polyunsaturated fatty acid glyceride having an iodine value in excess of 100, e.g. tung oil. The composition may comprise a mixture of the halogenated copolymer and at least one other unsaturated elastomer. In-situ reaction between the halogenated copolymer and the fatty acid glyceride during rubber compounding imparts unsaturation to the halogenated copolymer which permits facile vulcanization and covulcanization using conventional sulfur curatives.
Claims5
A sulfur curable composition comprising a mixture of:
- a) a chlorinated or brominated elastomeric interpolymer of a C.sub.4 to C.sub.7 isomonoolefin and a para-alkylstyrene,
- b) from 0 to about 90% by weight based on the elastomer content of said composition of at least one unsaturated elastomer,
- c) a vulcanization promoter comprising an unsaturated fatty acid glyceride oil containing from about 18 to 22 carbon atoms and having an iodine value in excess of about 100, said glyceride being present in said composition in an amount effective to promote the vulcanization of said composition, and
- d) sulfur and/or a sulfur-containing curative in an amount effective to cure said composition.
Dependencies are inferred from the claim text.