| 摘要 |
PURPOSE:To obtain the title rubber composition free of blooming of a vulcaniza tion accelerator used and does not undergo any decrease in tack, by mixing a halogenated butyl rubber with 2-(4'-morpholinodithio)benzothiazole. CONSTITUTION:A halogenated butyl rubber (e.g., chlorobutyl rubber or brominated butyl rubber) is mixed with 2-(4'-morpholinodithio)benzothiazole (MDB) to obtain the purpose rubber composition for inner liners of tires. The mixing proportion of MDB is suitably such that about 0.2-2pts.wt. MDB is present per 100pts.wt. stock rubber component. In this way, an unvulcanized sheet for inner liners having good tack retention and free of blooming of a vulcanization accelerator when dibenzothiazyl disulfide is used as the vulcaniza tion accelerator can be obtained because MDB is added to a stock rubber com prising a halogenated butyl rubber.
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