Benzothiazyl disulphide

Because of their high molecular weight, the hydroxy-terminated polymers are difficult to process and a chemical plasticizer is usually added to facilitate milling. The plasticizer is a disulphide such as benzothiazyl disulphide (mercaptobenzothiazole disulphide, MBTS) interchanges of the following type... 

Until now the use of crosslinking systems based on thiuram disulphide for compounds which reach high temperatures has been difficult owing to the inadequacy of the scorch times. However, Leibbrandt has drawn attention to the development of systems comprising tetramethyl thiuram disulphide (or preferably dimethyl diphenyl thiuram disulphide), N-morpholinyl-2-benzothiazyl sulphenamide, a special retarder (Vulkalent E), and 0-5-0 8 phr of sulphur which, especially in the case of NBR, combine high processing safety with short vulcanisation times. The thiuram disulphide can be replaced by other sulphur donors (see Table 3 and Fig. 9). 

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