C - Chemistry – Metallurgy – 08 – L
Patent
C - Chemistry, Metallurgy
08
L
400/1, 6/115, 18
C08L 21/00 (2006.01) C08J 3/24 (2006.01) C08K 5/54 (2006.01) C08K 5/548 (2006.01)
Patent
CA 1123145
ABSTRACT OF THE DISCLOSURE The present invention provides in a formable and vulcan- isable rubber mixture which contains at least one rubber which still contains double bonds and which can be crosslinked with sulphur and a vulcanisation accelerator to form an elastomer from 0.2 to 10 parts by weight of sulphur, from 0.2 to 10 parts by weight of at least one vulcanisation accelerator and from 1 to 10 parts by weight of at least one silane corresponding to the formula Image (I) in which each of the individual radicals R and R1 represents an alkyl group containing from 1 to 4 carbon atoms, a cycloalkyl group containing from 5 to 8 carbon atoms or the phenyl radical; n is 0, 1 or 2, Alk is a difunctional straight-chain or branched hydrocarbon radical containing from 1 to 10 carbon atoms, and x is a number of from 2.0 to 8.0, or its hydrolysate and, the improvement in which the silane, vulcanisation accelerator and sulphur, expressed as S8, are present in such a molar ratio that, at the vulcanisation temperature, the rubber mixture has a rever- sion R resulting from the crosslinking isotherm (DIN 53 529) of 0 (+ 5%), R being calculated in accordance with the following formula: Image (II) in which Dmax is the maximum Vulcameter torque, Dmin is the mini- mum Vulcameter torque, D(max + 60 mins.) is the Vulcameter torque as measured 60 minutes after appearance of the maximum torque. The mixture is useful in the preparation of motor vehicle tires.
339331
Tan Ewe-Hong
Wolff Siegfried
Aktiengesellschaft Degussa
Marks & Clerk
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