| 摘要 |
1289407 Vulcanization accelerators MON. SANTO CO 18 Nov 1970 [19 Nov 1969] 54807/70 Heading C3E [Also in Division C2] Novel vulcanization accelerators comprise benzothiazole sulphenamides of the formula in which T is a 2-benzothiazolyl radical optionally substituted by Cl, Br, F, I, NO 2 or C 1-8 alkoxy, R 1 is a C 4-8 tertiary alkyl group, and R 2 and R 3 are C 1-8 alkyl groups or together complete a C 5-8 cycloalkyl group. The accelerators are used in heat vulcanization of sulphur- or sulphur vulcanizing agent-containing rubbers, particularly styrene-butadiene copolymers, optionally blended with polybutadiene, or natural rubber, in amounts of 0À1-5% by wt. of rubber. The curing characteristics of a variety of stocks are described. |
