Sumitomo Chemical Company, Limited

Junichi Ebisutani

Seiji Sagawa

Tsunehiko Nakagawa

Kenjiro Mori

Osamu Yoshida

The premature vulcanization of rubber materials is substantially inhibited by incorporating therein a sulfenamide of the formula: ##SPC1## Wherein R, which may be the same or different, is alkyl of 1 to 8 carbon atoms. The preferred sulfenamide is N-phenythio-3,5-lupetidine. Said sulfenamide is incorporated into the rubber with or without a conventional vulcanization accelerator and is preferably employed in the form of a powder preparation adsorbed in an inorganic carrier.

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Neyagawa, Japan

Junichi Ebisutani