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US 5,130,363 AGranted
Rubber vulcanizates having improved hysteresis behavior
AssigneeBayer Aktiengesellschaft
InventorsThomas Scholl, Hans-Wilhelm Engels, Ulrich Eisele, Ulrich Eholzer
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Abstract
The rubber vulcanizates according to the invention, which are produced using certain carboxyalkyl oligosulfides, are distinguished by improved hysteresis behavior; their mechanical properties remain substantially unaffected.
Claims3
Rubber vulcanizates produced from at least one rubber, a crosslinking agent, a filler, optionally other rubber auxiliaries and at least one carboxyalkyl oligosulfide corresponding to the following formula
- R.sup.1 -(S).sub.r -R.sup.2 (I)
- in which
- R.sup.1 and R.sup.2 may be the same or different and represent a C.sub.1-18 alkyl radical or C.sub.5-18 cycloalkyl radical substituted 1 to 4 times by a carboxyl group or by a carboxylate group;
- in the case of a carboxylate group, the cation is an ammonium group, a C.sub.1-18 mono-, di- or trialkyl ammonium or C.sub.6-18 mono-, di- or triaryl ammonium or C.sub.7-21 mono-, di- or trialkylaryl ammonium group or a mono- to tetravalent metal atom and
- r is an integer of 3 to 6,
- in quantities of 0.1 to 10% by weight, based on rubber.
3 more elements
A process for the production of rubber vulcanizates, characterized in that
- (i) the unvulcanized rubber,
- (ii) 10 to 120% by weight, based on rubber (i), of carbon black and/or silica and
- (iii) 0.1 to 10% by weight, based on rubber (i), of carboxyalkyl oligosulfides corresponding to formula (I)
- R.sup.1 -(S).sub.r -R.sub.2 (I)
- in which
- R.sup.1 and R.sup.2 may be the same or different and represent a C.sub.1-18 alkyl radical or C.sub.5-18 cycloalkyl radical substituted 1 to 4 times by a carboxyl group or by a carboxylate group;
- in the case of a carboxylate group, the cation is an ammonium group, a C.sub.1-18 mono-, di- or trialkyl ammonium or C.sub.6-18 mono-, di- or triaryl ammonium or C.sub.7-21 mono-, di-or trialkylaryl ammonium group or a mono- to tetravalent metal atom and
- r is an integer of 3 to 6,
- are mixed at melt temperatures of 120.degree. to 200.degree. C. and at shear rates of 1 to 1000 sec.sup.-1, other vulcanization chemicals (crosslinking agents) and optionally other rubber auxiliaries are subsequently incorporated at temperatures below 120.degree. C. and the mixture is subsequently vulcanized at typical temperatures.
6 more elements
Dependencies are inferred from the claim text.