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Rubber vulcanizates having improved hysteresis behavior
| Details |
Inventors: Scholl, Thomas; Engels, Hans-Wilhelm; Eisele, Ulrich; Eholzer, Ulrich;
Assignee: Bayer Aktiengesellschaft (Leverkusen, DE)
Primary Examiner: Michl; Paul R.
Assistant Examiner: Asinovsky; Olga
Attorney, Agent or Firm: Connolly & Hutz
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. |
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DETAILED DESCRIPTION We claim: 1.
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.
2.
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.
3.
Moldings of the vulcanizates claimed in claim 1.
Description:
This invention relates to rubber vulcanizates having improved hysteresis properties and a process for the production of the rubber vulcanizates
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Adhesives and Rubbers 
