Importance

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Abstract

It now has been found that uncured rubber composition comprising rubbers having an unsaturated carbon chain and at least one carbon black can be improved by including therein, a minor property-improving amount of at least one aromatic heterocyclic di-N-oxide compound of the partial formula ##STR1## wherein the depicted carbon atoms are part of an optionally substituted aromatic ring, and R.sup.1 and R.sup.2 are each independently hydrogen, hydrocarbyl, halohydrocarbyl, hydrocarbyloxy, hydrocarbyl sulfonyl, hydrocarbyl thio, hydrocarbylsulfoxidyl, halogen, amino, --CN --OH --CHO --CH(O hydrocarbyl)2 --C(O)R.sup.3 --C(O)OR.sup.3 --C(N--OH)R.sup.3 --C(O)NR.sup.3 R.sup.6 --CH.dbd.N--NH--C(O)OR.sup.3 --CH.sub.2 OC(O)CH.sub.3 --R.sup.4 YR.sup.3 --C(O)NHR.sup.4 OH --C(NH)NR.sup.7 R.sup.8, or --C(O)NHN(R.sup.3).sub.2 wherein each R.sup.3 is independently hydrogen or a hydrocarbyl group, R.sup.4 is a divalent hydrocarbyl group, R.sup.6 is hydrogen, hydrocarbyl, --R.sup.4 OR.sup.3, or --R.sup.4 COOR.sup.3 ; R.sup.7 is hydrogen or a hydrocarbyl group; R.sup.8 is hydrogen or a hydrocarbyl, an amino, or a hydroxyl group; R.sup.7 and R.sup.8 may be hydrocarbyl groups joined together to form a ring including the nitrogen atom, and Y is O, divalent S, --NH--, --S(O)-- or --S(O).sub.2 or R.sup.1 and R.sup.2 may be joined together to form further ring systems which may be saturated or unsaturated, and further substituted or unsubstituted. When vulcanizates are prepared from such uncured rubber compositions, particularly when the carbon black used therein has an average surface area of at least about 20 m.sup.2 /g, the vulcanizates exhibit reduced low strain hysteresis and exhibit no significant undesirable odor. In another aspect of the invention, a filled vulcanizate made by vulcanizing uncured compositions of the type described above and containing a filler, particularly carbon black, is improved in filler interaction, hysteresis, modulus, compression set and resiliency. Rubber articles and portions thereof made from such vulcanizates such as tires, hoses, belts, springs, treads, sidewalls, and the like can be made utilizing the improved filled vulcanizates of the invention.

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First Claim