| 摘要 |
Chlorinated butyl rubber (prepared according to the parent Specification) is vulcanized with an admixture of at least one bivalent metallic oxide, e.g. zinc oxide, thiuram sulphide and/or a thiocarbamate, at a temperature between room temperature and 450 DEG F., preferably 250 DEG to 450 DEG F., in the absence of added elemental sulphur. Thiuram sulphides include C1 to C10 tetra alkyl or C6 to C12 tetra aryl aralkyl or alkaryl thiuram sulphides, e.g. tetramethyl thiuram sulphide, tetramethyl to tetra-amyl thiuram disulphides, tetraphenyl, tetrabenzyl, and N - dimethyl - N1 - phenyl aminoethyl - N1 - phenyl thiuram disulphides and di-N-pentamethylene thiuram tetrasulphide and mixtures thereof, and the thiocarbamates include metal or amine salts such as tellerium, zinc, copper, cadmium, selenium, lead, bismuth, potassium. Accelerators, such as benzothiazyl disulphide, mercaptobenzothiazole, bis-4,5-dimethyl, zinc and dinitrophenyl benzothiazyl sulphides, 2-mercaptothiazoline benzothiazyl-2-monocyclohexyl sulphenamide, benzyl hexamethylene tetrammonium-2-benzothiazyl sulphide, 2-mercapto imidazoline, phenyl aminomethyl-2-benzothiazyl sulphide and mixtures thereof, fillers, plasticizers, glycols, extender oils and antioxidants, together with up to 30% of a dienestyrene copolymer or a natural rubber may be included in the vulcanizate. Shaped articles such as tubeless type pneumatic tyres may be prepared from the composition. |
