Benzothiazole sulphenamide

A non-sulphur vulcanising agent for natural rubber and some types of synthetic rubber. One trade name is Dicup. /V,A/-Dicyclohexyl-2-benzothiazole sulphenamide... 

Abbreviation for Nigerian Standard Rubber. A/-terf-Butyl-2-Benzothiazole Sulphenamide... 

Benzothiazole sulphenamide accelerators are suitable for semi-efficient and efficient vulcanisation systems. 

Barnes et al developed an LC-MS method to identify vulcanisation agents and their breakdown products in food and drink samples. A large sample of 236 retail foodstuffs were analysed for the presence of 2-mercaptobenzothiazole (MBT) and its breakdown product mercapto-benzothiazole (MB). The accelerators 2-mercaptobenzothiazyl (MBTS) and A-cyclohexyl-2-benzothiazole sulphenamide (CBS), which are commonly used in food contact rubbers, were also looked for. MBT and MB are also known to be breakdown products of these two compounds. The detection limit for these species was found to depend on the food product type and ranged from 0.005-0.043 mg/kg. No MBT, MB, MBTS or CBS were detected in any of the samples above these levels. 

Cyclic jS-keto-esters can be cleaved by treatment with (2-benzothiazole)-sulphenamides to give w-alkoxycarbonyl derivatives, e.g. (98) from 2-methoxy-carbonylcyclopentanone, in generally excellent yields. ... 

Hilton and Altenau and Hayes and Altenau used mass spectrometry to qualitatively identify volatile antioxidants in sheet samples of synthetic styrene-butadiene rubbers and rubber type vulcanizates. They extracted the polymer with acetone in a Sohxlet apparatus, removed excess solvent and dissolved the residue in benzene. Substances identified and determined by this procedure include N-phenyl-fi-napthylamine, 6-dodecyl-2,2,4-trimethyl 1,2-dihydroquinolines, trisnonyl-phenyl-phosphite, isobutylene - bisphenol A reaction product, 2-mercaptobenzothiazole sulphen-amide (accelerator) N-cyclohexyl-2-benzothiazole sulphenamide, N-tert-butyl-2-benzo-thiazole sulphenamide, 2-(4-morpolinothio) benzothiazole, 2-(2,6-dimethyl-morphal-inothio) benzothiazole, N,N -diisopropyl 2-benzothiazoles, 2-mercaptobenzo-thiazole and N,N -dicyclohexyl-2-benzothiazole sulphamide. 

Cure-Rite IBM and Cure-Rite IBT from B.F.Goodrich, a thiuram monosulphide and disulphide, respectively, based upon diisobutylamine, are new low nitrosamine-producing accelerators. These additives, together with other commercial thiuram compounds, were compared as co-accelerators for benzothiazole sulphenamides in SBR/polybutadiene and NR compounds. The effects that these thiurams had on the scorch safety and cure rates during curing and on the reversion resistance of the vulcanisates were demonstrated. Cure-Rite IBM excelled in improving the scorch safety of the benzothiazole while improving the cure rates. Cure-Rite IBT appeared to be a... 

Two thiuram accelerators developed by Goodrich, Cure-rite IBM tetraisobutylthiuram monosulphide and Cure-rite IBT tetraisobutylthiuram disulphide, were evaluated along with other commercial thiurams as co-accelerators for benzothiazole sulphenamides in the vulcanisation of NR and SBR/polybutadiene tyre compounds. The effects of these thiurams on scorch safety and cure rates during vulcanisation and on the reversion resistance of vulcanisates were investigated, and differences in the types of sulphur crosslinks developed by the various thiurams were examined. 6 refs. 

Manchester, 7th-10th June 1999, Materials paper 2. IMPROVED RUBBER PROPERTIES BY USING N-T-BUTYL-2-BENZOTHIAZOLE SULPHENAMIDE... 

Tetraisobutylthiuram monosulphide (TiBTM) was used as a cure retarder and secondary accelerator (kicker) with benzothiazole sulphenamide accelerators in the vulcanisation of NR and SBR/polybutadiene compounds. Increases in cure temperature, various levels of sulphur... 

Louisville, Ky., 8th-l 1th Oct.1996, Paper 89, pp.l4. 012 TETRAISOBUTYLTHIURAM MONOSULPHIDE HOW CAN IT BE BOTHA CURE RETARDER AND ACCELERATOR WITH BENZOTHIAZOLE SULPHENAMIDES ... 

A study was made of the mechanisms by which tetraisobutylthiuram monosulphide (TiBTM) acts both as a retarder and a secondary accelerator in curing systems containing benzothiazole sulphenamides as primary accelerators. Model reactions between TiBTM andTBBS, CBS or MBTS were followed by HPLC to identify intermediates formed between TiBTM and its various analogues and the primary accelerators. Some of these intermediates were independently synthesised and evaluated as retarders and secondary accelerators in SBR/ polybutadiene compounds. The isobutyl groups were responsible for imparting scorch delay characteristics to one of these intermediates, while another intermediate was most likely responsible for the secondary accelerator effect. 14 refs. 

Investigations were carried out with the binary combinations of each of bis(N-methylpiperazino)thiuram disulphide, tetrabenzylthiuram disulphide, and tetramethylthiuram disulphide, separately with N-cyclohexyl-2-benzothiazole sulphenamide, 2-mercaptobenzothiazole, and 2-mercaptobenzothiazyl disulphide in the combinations studied. 19 refs. 

Tetraisobutylthiuram monosulphide (TiBTM) was evaluated as a retarder and secondary accelerator for both N-t-butyl-2-benzothiazole sulphenamide and N-cyclohexyl-2-benzothiazole sulphenamide in SBR/ polybutadiene and NR compounds. TiBTM was also compared in these systems to the retarder N-cyclohexyl thiophthalimide (CTP) and the secondary accelerator tetramethylthiuram monosulphide (TMTM). When used at low levels with sulphenamide accelerators, TiBTM could extend the scorch time by 2-3 minutes and then increase the cure rate beyond that of the primary accelerator. The extent of these effects was influenced by the types of rubber and sulphenamide. At low levels TiBTM performed as an equivalent substitute for a CTP/... 

An examination is made of the performance of dicyclohexyl benzothiazole sulphenamide (DCBS) as an accelerator in tyre compounds. Cure characteristics, adhesion and flow properties are discussed, and it is shown that DCBS does not form carcinogenic N-nitrosamines. 8 refs. 

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