Reference

Vulcanization of neoprene rubber at relatively low temperatures

Vulcanization of neoprene rubber at relatively low temperatures. Maeda, Isamu; Aoshima, Masashi (Sumitomo Chemical Co., Ltd., Japan). Japan. Kokai JP 52090546 29 Jul 1977 Showa, 4 pp. (Japanese). (Japan). CODEN: JKXXAF. CLASS: IC: C08L011-00. APPLICATION: JP 76-145917 12 Jan 1973. DOCUMENT TYPE: Patent CA Section: 38 (Elastomers, Including Natural Rubber) Neoprene rubber or chlorinated ethylene-propene rubber is vulcanized at 5-85° in the presence of cumene hydroperoxide (I) [80-15-9] and p-quinone dioxime [105-11-3], ethylene dimethacrylate (II) [97-90-5], or N,N'-1,3-phenylenedimaleimide [3006-93-7]. Thus, a compn. of neoprene rubber 100, carbon black 50, ZnO 5, stearic acid 1, naphthenic oil 10, 70% I 7, and II 2 parts was rolled into 1-mm sheets. When the sheets were cured at 40°, they had tensile strength 50, 68, and 77 kg/cm2 after 1, 3, and 6 days, resp., and elongation 730, 450, and 330%, resp., compared with 27, 37, 36, 930, 700, and 710, resp., for a similar compn. without II.

Delayed-action peroxide vulcanization systems

Delayed-action peroxide vulcanization systems. Chow, Y. W.; Knight, G. T. (Malay. Rubber Prod. Assoc., Hertford, Engl.). Plast. Rubber, Process., 2(4), 115-18 (English) 1977. CODEN: PRUPDQ. DOCUMENT TYPE: Journal CA Section: 38 (Elastomers, Including Natural Rubber) The use of N-nitrosodiphenylamine [86-30-6] radical scavenger to control the cure characteristics of dicumyl peroxide-activated m-phenylenediaminebismaleimide [3006-93-7] vulcanizing agent for natural and synthetic rubbers was demonstrated. Radical generation kinetics was controlled by variation of the peroxide-nitroso ratio, and the modulus was varied independently by changing the maleimide concn. Cure characteristics similar to accelerated S vulcanization were obtained while retaining the property advantages of peroxide-cured rubbers.