Cyclohexyl benzothiazole

Figure 12.5a shows the effect of filler loading on the volume resistivity of MWNTs and CB (CB Ensaco 250G from Timcal) filled composites based on insulating styrene-butadiene rubber. The styrene-butadiene rubber contains 25 w% of styrene units. The microstructure of the butadiene phase is the following 10% cis, 17% trans, 73% 1,2. It was compounded with sulfur (1.1 phr), cyclohexyl benzothiazole sulfenamide (1.3 phr), diphenyl guanidine (1.45 phr), stearic acid (1.1 phr), zinc oxide (1.82 phr) (phr = parts per hundred parts of rubber). The unfilled and filled samples are cured into films (around 200 pm thick) at 170°C during 10 min under a pressure of 150 bar in a standard hot press. 

Accelerators used include hexamine, diphenyl guanidine, ethylidene aniline, mercapto-benzothiazole, dibenzothiazole disulfide, N-Cyclohexyl benzothiazole sulfenamide, sodium diethyl dithiocarbamate, tetramethylthiuram disulfide, tetraethyl thiuram disulfide, dipentamethylene thiuram tetrasulfide, sodium isopropyl xanthate, zinc butyl,... 

Bhatnagar S.K. and S. Baneijee. 1968. Kinetics of accelerated vulcanization. El. V-cyclohexyl-benzothiazole-2-sulfenamide accelerated sulphur vulcanization of rubbers. J. Inst. Rubber Ind. 2 177-193. 

Solution styrene butadiene rubber (S-SBR) (Sprintan SLR-4601, Styron Deutschland GmbH) and acrylonitrile butadiene rubber (NBR) (Perbunan 3445F, Lanxess GmbH) with a nitrile content of 34% as well as NR (SMR 10, Standard Malaysian Rubber) were used as rubbers. The silica used was Ultrasil 7000 GR (Evonik Industries) with a specific surface area CTAB of 160 m /g and BET of 170 m /g. Stearic acid, zinc oxide (ZnO), N-cyclohexyl-benzothiazole-2-sulfenamide (CBS) and sulfur were used as processing and curing additives, respectively. The experimentally determined values of surface tension and Mooney viscosity of the materials used are given in Table 6.1. 

Once devulcanised in the Banbury using a 3.5 min (0.5 min initially, then 3 min with the mix of chemical agents) programme, the devulcanised samples were mixed with 0.4 phr cyclohexyl benzothiazole (CBS), 5 phr zinc oxide and 1 phr stearic acid and revulcanised at 160 C. The time that was used for each material was obtained from the T90 (i.e., 90% cure state) time value recorded in a rheometer trace. 

MET, mercaptobenzothiazole TMTM, tetramethylthiuram mono sulfide TMTD, tetramethylthiuram disulfide and CBTS, Al-cyclohexyl-2-benzothiazole... 

CBS, CZ (V-Cyclohexyl-2-benzothiazole DGEBA Diglycidyl ether of bisphenol A... 

Analysis of a sample from the hose pipe indeed showed the presence of benzothiazole and when the chromatogram of this sample was compared to that of the wine sample contaminated with this piping, there was a peak common to both of them. The mass spectra of the compounds found in the wine (Fig. 10.3) and of the sample from the hose were also similar. In both cases, from the library of reference spectra this compound has been identified as cyclohexyl isothiocyanate C6Hn-N=C=S and is a contaminant produced in the manufacture of rubber materials (Cocheo etal. 1983). 

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. 

HAF carbon black 40, zinc oxide 5, N-cyclohexyl-2-benzothiazole sulfamide 1, diphenyl guanidine 1, stearic acid 1 and sulfur 1.5. After 40 mins, of milling, the homogeneous stock was cured for 30 minutes at 160°. Extraction was carried out witii n-hexane at 65° for 24 hours. 

Sulfenamides, made from 170, by reactions involving primary and secondary amines under oxidizing conditions, include A-cyclohexyl-2-benzothiazole sulfenamide (173) and N-oxydiethylene-2-bcnzolhiazolc sulfenamide (2-(morpholinothio)benzothiazole) (174). Sulfenamides release 2-mercapto accelerators and amine during vulcanization. The amine is a secondary accelerator that brings about fast vulcanization after a slow start. Applications include in tyres and conveyor belts. They are not applicable to hot-air vulcanization processes95. 

Die Reaktion von 2-Trimethylsilyl-l,3-benzothiazol mit 3-Oxo-cyclohexen in Gegenwart von Casiumfluorid verlauft, im Gegensatz zur Umsetzung von 2-Lithio-l,3-benzothiazol mit a,/i-ungesiittigten Carbonyl-Verbindungen (s.S. 956, dort Tab. 94), offenbar als 1,4-Addition man erhalt 50% 2-(3-Oxo-cyclohexyl)-l,3-benzothiazolA1° (zur Arbeitsweise s.S. 954) ... 

Die Reaktion von 2-Iod-l,3-benzothiazol mit Cyclohexyl-quecksilberchlorid erfolgt unter Be-strahlung (350 nm Rayonet Photoreactor Dimethylsulfoxid 40-45 ) zu 62% 2-Cydohexyl-1 J-bcnzothiazol46 ... 

See N-Cyclohexyl-2-benzothiazolesulfenamide 2-Benzothiazolesulffenamide, N,N-diisopropyl-. See Diisopropyl benzothiazole sulfonamide... 

Benzothiazol-2-ylthio) succinic acid. See 1-(Benzothiazol-2-ylthio) succinic acid Benzothiazyl-2-t-butyl sulfenamide. See Butyl 2-benzothiazole sulfenamide Benzothiazyl-2-cyclohexyl sulfenamide. See N-Cyclohexyl-2-benzothiazolesulfenamide Benzothiazyl-2-dicyclohexyl sulfenamide. See Dicyclohexylbenzothiazyl-2-sulfenamide 2-Benzothiazyl-N,N-diethylthiocarbamyl sulfide Synonyms Diethyidithiocarbamic acid-2-benzothiazoyl ester Empincal C12H14N2S3 Formula (C6H4SCN)SSCN(C2H5)2 Properties Lt. yel. to tan free-flowing powd. dens. 

ROVI Beads White. See Hydrogenated jojoba oil Roxadimate. See Ethyl dihydroxypropyl PABA Royal CBTS. See N-Cyclohexyl-2-benzothiazolesulfenamide Royal MBT. See 2-Mercaptobenzothiazole Royal MBTS. See Benzothiazyl disulfide Royal OBTS. See N-Oxydiethylene benzothiazole-2-sulfenamide Royal RM 99-GB-1.0-S-2.0 Sulfur. See Sulfur Royal TMTD. See Tetramethylthiuram disulfide Royalac 136A. See Zinc dibutyl dithiophosphorate... 

Santicizer 278. See Benzyl phthalate Santochlor 20] Santochlor Flakes] Santochlor Molten. See p-Dichlorobenzene Santocur CBS. See N-Cyclohexyl-2-benzothiazolesulfenamide Santocure DCBS. See Dicyclohexyl benzothiazyl-2-sulfenamide Santocure IPS. See Diisopropyl benzothiazole sulfonamide... 

The CYP450 3A4 model based on the ketoconazole crystal structure was used within MetaSite3 to predict SOM for compound 4 (Figure 11.5a). Built-in corrections for reactivity of the cytochrome and the ligand were applied. Both for compounds 3 and 4, the predicted primary SOM is the benzylic alpha position to the thiadiazole ring (Figure 11.5b). The SOM predicted by MetaSite next in hierarchy, the hydroxylation of the benzylic position of the cyclohexyl moiety, was not observed experimentally, nor was the aromatic oxidation of the benzothiazole sulfur. Instead, in vitro metabolism studies are in agreement with the primary SOM and confirmed a labile cyclopentyl-ethyl moiety, but a stable thiadiazol scaffold and a stable... 

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