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AssigneeDeutsche Gold- und Silber-Scheideanstalt vormals Roessler
InventorsKurt Burmester, Siegfried Wolff, Erhard Klotzer, Friedrich Thurn
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A vulcanizable rubber mixture for tire treads containing a rubber, preferably vulcanizable with sulfur, silica filler, plasticizer oil, a sulfur containing organosilane, sulfur and an accelerator comprising one or two polybutadiene rubbers in an amount of 20 to 100 weight % of the total elastomer, one or two rubbers other than a polybutadiene of the group consisting of synthetic rubber and natural rubber in an amount of 80 to 0 weight % of the total elastomer, plasticizer oil in an amount of 40 to 100 parts by weight per 100 parts by weight of rubber, at least one bis-[alkoxysilylalkyl]-oligosulfide in an amount of 0.1 to 25 parts by weight per 100 parts by weight of rubber, sulfur and/or sulfur donors in an amount of about 0.2 to 8 parts by weight per 100 parts by weight of rubber, and at least one vulcanization accelerator in an amount of about 0.1 to 8 parts by weight per 100 parts by weight of rubber, as well as in a given case other customary ingredients in the usual amounts employed in the tire industry, e.g., anti-agers, dyes, pigments, adhesive additives, activators and waxes. The preferred vulcanization accelerators are sulfur containing triazines disclosed in Westlinning U.S. Pat. No. 3,801,537.
A vulcanizable rubber mixture suitable for skid resistant tire treads comprising (1) a rubber, 20 to 100% of the total rubber being polybutadiene rubber and 80 to 0% of the rubber being a sulfur vulcanizable synthetic rubber other than polybutadiene or being natural rubber, (2) silica filler in an amount of 20 to 200 parts by weight per 100 parts of rubber with the proviso that if carbon black is also present the amount of silica is 40 to 200 parts by weight per 100 parts of rubber, (3) plasticizer oil in an amount of 40 to 100 parts by weight per 100 parts of rubber, (4) sulfur or a sulfur donor in an amount of 0.2 to 8 parts by weight per 100 parts of rubber, (5) an accelerator in an amount of 0.1 to 8 parts by weight per 100 parts of rubber, and (6) 0.1 to 25 parts by weight per 100 parts of rubber of a sulfur containing organosilane having the formula Z--alk--S.sub.n --alk--Z in which ##EQU7## ##EQU8## in which R.sub.1 is alkyl of 1 to 4 carbon atoms, cycloalkyl of 5 to 8 carbon atoms or phenyl, R.sub.2 is alkoxy of 1 to 8 carbon atoms or cycloalkoxy of 5 to 8 carbon atoms, alk is a divalent hydrocarbon group of 1 to 8 carbon atoms, and n is a number of 2 to 6.
Dependencies are inferred from the claim text.