Alcance
This document specifies the methods to be used for the evaluation of sulfenamide accelerators:— MBTS: benzothiazyl disulphide;— CBS: N-cyclohexylbenzothiazole-2-sulfenamide;— TBBS: N-tert-butylbenzothiazole-2-sulfenamide;— DIBS: N,N'-diisopropylbenzothiazole-2-sulfenamide;— DCBS: N,N'-dicyclohexylbenzothiazole-2-sulfenamide;— MBS: N-oxydiethylenebenzothiazole-2-sulfenamide.NOTE 1 Although MBTS is not a sulfenamide, it is the primary decomposition product of these accelerators and quantitatively determined by the method specified in 5.2.The analytical methods are applicable for most commercial sulfenamide accelerators:— sulfenamides of primary amines (type I);— sulfenamides of unhindered secondary amines (type II);— sulfenamides of hindered secondary amines (type III).NOTE 2 Classification and key properties of sulfenamide accelerators are described in Annex A.The method (5.2) to determine purity by high performance liquid chromatography (HPLC) is the preferred method.