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Rubber mixtures giving reversion-free vulcanizates and process of vulcanization
| Details |
Inventors: Wolff, Siegfried; Tan, Ewe-Hong;
Assignee: Degussa Aktiengesellschaft (Frankfurt am Main, DE)
Primary Examiner:
Assistant Examiner:
Attorney, Agent or Firm:
Mouldable and vulcanisable rubber mixtures are made containing a rubber (A) which still contains double bonds and which is cross-linkable by means of sulphur and a vulcanization accelerator or a mixture of rubber (A) with a different rubber (B), 0.2 to 10 parts of sulphur, 0.2 to 10 parts of a vulcanization accelerator and 1.0 to 10 parts of a bis-(alkoxysilylalkyl)polysulfide. There can also be present a silicate filler and/or a carbon black filler of rubber. The rubber mixtures have the silane, vulcanization accelerator and sulphur, calculated as S.sub.8 present in a molar ratio which causes the rubber mixture to have a reversion R=O (.+-.5%) resulting from the cross-linking isotherm at the vulcanization temperature where the reversion R is calculated according to Formula II ##EQU1## in which D.sub.max is the maximum vulcameter moment of rotation D.sub.min is the minimum vulcameter moment of rotation D.sub.(max+60 min) is the vulcameter moment of rotation measured 60 minutes after the appearance of the maximum moment of rotation. There is also disclosed the process of vulcanizing the above-mentioned rubber mixtures or moulding compositions and forming vehicle tires using the rubber mixtures. |
|
DETAILED DESCRIPTION What is claimed is: 1.
A composition which is a formable and vulcanisable rubber mixture comprising a rubber (A) which still contains double bonds and which can be cross-linked with sulphur and a vulcanisation accelerator to form an elastomer or a mixture of such a rubber (A) with a different rubber (B) and 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 a silane corresponding to the formula [R.
sub.
n.
sup.
1 (RO).
sub.
3-n Si-Alk-].
sub.
2 S.
sub.
x (I) in which R and R.
sup.
1 represent an alkyl group containing from 1 to 4 carbon atoms, a cycloalkyl group containing from 5 to 8 carbon atoms or the phenyl radical; all the radicals R and R.
sup.
1 may be the same or different in meaning, n=0, 1 or 2, Alk is a difunctional hydrocarbon radical containing 1 to 10 carbon atoms, and x is a number of from 2.
0 to 8.
0, or its hydrolysate, all parts by weight being based on 100 parts by weight of rubber, wherein the rubber mixtures contains the silane, vulcanisation accelerator and sulphur, expressed as S.
sub.
8, in such a molar ratio that, at the vulcanisation temperature, the rubber mixture has a reversion R resulting from the cross-linking isotherm (DIN 53 529) of 0 (.
+-.
5%), the reversion R being calculated in accordance with the following formula: ##EQU4## in which D.
sub.
max is the maximum vulcameter torque, D.
sub.
min is the minimum vulcameter torque, D.
sub.
(max+60 mins) is the vulcameter torque as measured 60 minutes after appearance of the maximum torque.
2.
A rubber mixture according to claim 1 wherein n is 0, R is alkyl of 1 to 4 carbon atoms and Alk is an alkylene group having 2 to 4 carbon atoms.
3.
A rubber mixture according to claim 1 containing (1) 1 to 300 parts by weight of silicate filler, (2) from 0.
1 to 150 parts by weight of carbon black filler or (3) a mixture of a silicate filler and a carbon black filler, the total amount of filler being 1 to 300 parts by weight of which 0
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