Abstract: There is disclosed a process for the preparation of sulfenimides comprising: mixing, in a hydrocarbon solvent, a sulfenamide of the formula with an aldehyde of the formula R4CHO where X is a sulfur atom, a —C═N— group, or a —C═C— group, R1 and R2 are independently selected from the group consisting of hydrogen, alkyl, and aryl or may be joined to form a saturated or unsaturated ring or aromatic ring, R3 is alkyl or cycloalkyl, and R4 is a hydrocarbon radical wherein the carbon bearing the aldehyde function is bonded only to other carbon atoms, a substituted or unsubstituted aryl ring, or a heteroaromatic ring; and heating the mixture at a temperature and for a period of time sufficient to convert the sulfenamide to the sulfenimide.

Abstract: Novel substituted dithiocarbamylurea accelerators of the formula R.sup.1 NHC(O)NHSC(S)NR.sup.2 R.sup.3 wherein R is phenyl or substituted phenyl and R.sup.2 and R.sup.3 are alkyl, aryl or aralkyl or together are alkylene, oxydialkalene or thiodialkylene exhibit unexpectedly improved scorch safety when employed as sulfur cure accelerators. In another aspect, this invention relates to accelerator compositions comprising said accelerators and thiuram or benzothiazole sulfenamide accelerators. In yet another aspect, this invention relates to curable compositions comprising such novel accelerators, sulfur and/or a sulfur donor compound and a sulfur curable rubber.

Abstract: A compound of the formulaR.sup.1 --NHC(O)NHSC(S)NR.sup.2 R.sup.3wherein R.sup.1 is phenyl; phenyl substituted with halogen, alkyl, NR.sup.4 R.sup.5 wherein R.sup.4 and R.sup.5 are the same or different and are hydrogen or alkyl; alkoxy, alkylthio, methylenedioxy, COOR.sup.6 wherein R.sup.6 is alkyl; or NHCOOR wherein R.sup.7 is alkyl; R.sup.2 and R.sup.3 are the same or different and are alkyl, cycloalkyl or aralkyl, and R.sup.2 plus R.sup.3 are alkylene, oxydialkylene or thiodialkylene.