Thiuram disulphides

Tetramethyl succinonitrile Tetramethyl thiourea Tetramethyl thiuram disulphide (thiram) Tetranitromethane... 

During World War II, polychloroprene was chosen as a replacement for natural rubber because of its availability. Two copolymers of chloroprene and sulphur which contain thiuram disulphide were available (Neoprene GN and CG). One of the first successful applications of these polychloroprene adhesives was for temporary and permanent sole attachment in the shoe industry. However, these polychloroprene cements show a decrease in viscosity on ageing and a black discolouration appears during storage in steel drums. Discolouration was produced by trace amounts of hydrochloric acid produced by oxidation of polychloroprene... 

During emulsion polymerization, a high conversion of monomer to polymer produces cross-linked rubber which is insoluble. To obtain a high conversion in the polymerization reaction and a processable polymer, suitable polymer modification should be made. The use of sulphur moieties allows this goal to be reached [2]. Sulphur-modified polychloroprenes contain di- and polysulphide sequences in the polymer chains. After the polymerization reaches the desired degree, reaction is stopped by adding thiuram disulphide ... 

These polymers are very sensitive to mastication. Mastication decreases the solution viscosity and increases the ease of solution. Because the reactive sulphur linkages, rapid vulcanizing properties are obtained. On the other hand, the presence of thiuram disulphide improves the resistance of CR to dehydrochlorination. 

Although there are several manufacturers of polychloroprene elastomers, Du Pont probably has the broader range of polychloroprene grades on the market. As an example in Table 3, the equivalencies between the peptizables sulphur-modified and stabilized with thiuram disulphide polychloroprenes are given... 

Peptizables grade polychloroprenes, sulphur-modified and stabilized with thiuram disulphide... 

Tetraethyl thiuram disulphide, accelerator. Tetrabenzyl Thiuram Disulphide TBZTD, accelerator. 

A term applied to a class of organic accelerators with a very fast and powerful accelerating action examples are the thiuram disulphides, dithiocarbamates and xanthates. See TMT, ZDC and ZIX. 

Any substance which will bring about vulcanisation. Elemental sulphur remains a widely used vulcanising agent, but sulphur-containing substances (such as thiuram disulphides) have important uses. Organic peroxides (benzoyl and dicumyl) and nitroso derivatives (e.g., benzoquinone dioxime) are used in vulcanising certain synthetic elastomers. 

Reduction of the adhesion level will occur if certain compounding ingredients are not avoided. The acceleration system has a direct effect on the adhesion level dibenzothiazole disulphide (MBTS) gives the highest adhesion levels. If a second accelerator is used, e g., tetramethyl thiuram disulphide (TMTD) or diphenyl guanidine (DPG), then the adhesion is significantly affected. Other ingredients which cause problems are plasticisers and process oils. 

Chemically it is tetraethyl thiuram disulphide, commonly known as antabuse... 

Butyl 200, 25 furnace black, 5 zinc oxide, 1 stearic acid, 1 tetramethyl thiuram-disulphide, 0.5 mercaptobenzo-thiazole, 1 sulfur 40 min at 153° C Methyl methacrylate 55 39 31... 

---