RUBBER MIXTURES HAVING REINFORCING ADDITIVES AND A METHOD FOR PREPARING SUCH MIXTURE

摘要

1439247 Reinforced rubber compositions comprising a sulphur-containing organosilane DEUTSCHE GOLD-UND SILBER-SCHEIDEANSTALT 13 Nov 1973 [13 Nov 1972] 52637/73 Headings C3E C3P and C3Q A rubber mixture comprises a cross-linking system, at least one sulphur-containing organosilane of formula in which Z represents a group of formula in which each R1 represents a C 1 to C 4 -alkyl group or a phenyl radical and each R2 represents a C 1 to C 8 -alkoxy group, a C 5 to C 8 -cycloalkoxy group, or a C 1 to C 8 -linear or branched alkylmercapto group, the R1 and R2 groups in the same compound being the same or different; Alk represents a C 1 to C 18 -divalent, optionally unsaturated, linear, branched or cyclo-aliphatic hydrocarbon group and n is from 2 to 6 and one or more silica or silicate filler. A preformed mixture of the organosilane and silica or silicate may be added to the rubber and other components of the compounded rubber. Examples are given in which the rubber mixtures prepared comprise (a) bis - [3 - methoxysilyl - propyl] - trisulphide, silica and natural rubber; (b) bis-[3- triethoxysilylpropyl]- tetrasulphide with silica and cis - 1,4 - polyisoprene, or with silica and aluminium silicate, or kaolin, and butadiene-styrene rubber, or with silica and butadiene-acrylonitrile rubber, butyl-rubber, polychloroprene, ethylene-propylene terpolymer rubber or a mixture of butadiene-styrene rubber and cis-1,4-polybutadiene; (c) a preformed mixture of bis-[3-triethoxysilylpropyl]- tetrasulphide and silica added to a mixture of butadiene-styrene rubber and polybutadiene or to natural rubber; and (d) bis-[3-trimethoxysilylpropyl]-disulphide, silica and butadienestyrene rubber. The rubber mixtures also contain conventional additives.