Rubber compositions containing a vulcanization system alterative
AssigneeMonsanto Company
InventorEiichi Morita
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Abstract
Compositions of vulcanizeable diene rubber, a cross-linking agent, a vulcanization accelerator and a vulcanization system alterative are disclosed, which have improved properties of scorch delay, cure rate and reversion resistance. The alterative is a compound of the formula ##STR1## where R.sub.1 and R.sub.2 are the same or different radicals selected from alkyl of 1-12 carbon atoms, phenyl, cycloalkyl of 3-8 carbon atoms and alkyaryl and aralkyl of 7-12 carbon atoms, and R.sub.3 is selected from the same as R.sub.1 and R.sub.2, optionally substituted with one or more halogen, nitro, alkoxy, carboalkoxy, acyl, acyloxy, amido, cyano, thio or sulfonyl substituents.
Claims12
A composition comprising vulcanizable diene rubber, a cross-linking agent, a vulcanization accelerator selected from azoles, sulfenamides, thioureas, thiurams, xanthates, dithiocarbamates and guanidines and from 0.1 to 5.0 parts by weight per 100 parts of the rubber by weight of a vulcanization system alterative of the formula ##STR24## wherein R.sub.1 and R.sub.2 are the same or different radicals selected from alkyl of 1-12 carbon atoms, phenyl, cycloalkyl of 3-8 carbon atoms and alkaryl and aralkyl of 7-12 carbon atoms, and R.sub.3 is selected from the same radicals as R.sub.1 or R.sub.2, optionally substituted with one or more halogen, nitro, alkoxy, carboalkoxy, acyl, acyloxy, amido, cyano, thio or sulfonyl substituents.
Dependencies are inferred from the claim text.