Elastomeric compositions and processes for their production
AssigneeExxon Chemical Patents Inc.
InventorsBernard J. Costemalle, Pierre T. Hous
Life of this patent
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Abstract
An elastomeric composition comprising a major proportion by weight of a rubber comprising a halobutyl rubber (e.g. 75 to 95%) and a minor proportion by weight (e.g. 5 to 25%) of a copolymer of an olefin, e.g. ethylene, and an unsaturated carboxylic acid e.g. acrylic acid. This composition may be covulcanised with a general purpose rubber e.g. natural rubber, to which it has adequate adhesion. Thus a natural rubber tyre carcass may be covulcanised with a tyre inner liner formed of this composition.
Claims7
A polymer composition having improved scorch/cure balance comprising:
- (1) a rubber selected from halogenated butyl rubber and blends of a major portion of halogenated butyl rubber with a minor portion of natural rubber, polybutadiene, and styrene butadiene rubber;
- and (2) an olefin polymer consisting of a copolymer derived from a C.sub.2 to C.sub.5 olefin and an unsaturated carboxylic acid wherein the weight ratio of said copolymer to said rubber is between about 15:85 and 5:95.
A method for improving the scorch time of halobutyl rubbers comprising blending an olefin polymer consisting of a copolymer of a C.sub.2 to C.sub.5 olefin and an unsaturated carboxylic acid with a rubber selected from halogenated butyl rubber and blends of a major portion of halogenated butyl rubber with a minor portion of natural rubber, polybutadiene, and styrene butadiene rubber wherein in the blend the weight ratio of said copolymer to said rubber is between about 15:85 and 5:95.
Dependencies are inferred from the claim text.