| 摘要 |
A chlorinated synthetic rubber is obtained by chlorinating a butyl rubber at 0 DEG C. or above to give a rubber containing at least 0.5 per cent chlorine and not more than one combined atom of chlorine per double bond of the butyl rubber. Specified butyl rubbers are the copolymers of isobutylene with isoprene (preferred), butadiene, dimethylbutadiene and piperylene. Specified chlorinating agents are molecular chlorine, alkali metal (e.g. sodium) hypochlorites, sulphur chloride, pyridinium chloride perchloride, N-chlorosuccinimide, alphachloroacetoacetanilide, tri-chlorophenol chloride, N-chloroacetamide and beta-chloro-methyl phthalimide, and are used at preferably 0-100 DEG C. Inert hydrocarbons or halogenated derivatives of saturated hydrocarbons may be used as solvents for the chlorination step, which may be a continuous process. The chlorinated rubber may be vulcanized either alone or with natural rubber, reclaimed rubber; butadiene-styrene, butadiene-acrylonitrile, neoprene rubber or mixtures thereof together with the usual compounding ingredients.ALSO:A chlorinated butyl rubber obtained by chlorinating a butyl rubber at 0 DEG C. or above to give a rubber containing at least 0,5 per cent chlorine and not more than one combined atom of chlorine per double bond of the butyl rubber is vulcanized together with natural or reclaimed rubber and the usual compounding ingredients. |
