Rubber mixtures
The invention is directed to rubber mixtures comprising rubber, fillers, optionally further rubber auxiliaries and at least one organosilane of the general formula I: R 1 R 2 R 3 SiR 4 —SH (I) wherein: R 1 is methyl or ethyl, R 2 is methoxy, ethoxy or —O—(Y—O) m —X where Y=a branched or unbranched, saturated or unsaturated divalent hydrocarbon group, X is a C1- to C9-alkyl group and m=1-40, R 3 is methyl, ethyl or R 2 , and R 4 is a branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic divalent C 1 -C 12 hydrocarbon group. The rubber mixtures according to the invention are prepared by mixing rubber, filler, optionally further rubber auxiliaries and at least one organosilane of the general formula I. The rubber mixtures can be used for the production of shaped articles.
1. A rubber mixture comprising rubber, fillers, and at least one organosilane of the general formula I:
R 1 R 2 R 3 SiR 4 —SH (I)
wherein:
R 1 is methyl or ethyl;
R 2 is —O—(Y—O) m —X where Y is a branched or unbranched, saturated or unsaturated divalent hydrocarbon group, X is a C 1 -C 9 -alkyl group and m=1-40, R 3 is methyl, ethyl, methoxy, ethoxy or a group according to R 2
and R 4 is a branched or unbranched, saturated or unsaturated, aliphatic, aromatic or mixed aliphatic/aromatic divalent C 1 -C 12 hydrocarbon group.
2. The rubber mixture of claim 1 , wherein R 1 is methyl.
3. The rubber mixture of claim 1 , wherein R 1 is ethyl.
4. The rubber mixture of claim 1 , wherein R 3 is methoxy.
5. The rubber mixture of claim 1 , wherein R 3 is ethoxy.
6. The rubber mixture of claim 1 , wherein R 2 is —O—(Y—O) m —X where Y is an unbranched, saturated divalent hydrocarbon group, X is a C 1 -C 9 -alkyl group and m=1-40.
7. The rubber mixture of claim 1 , wherein R 3 is methyl.
8. The rubber mixture of claim 7 , wherein R 4 a saturated or unsaturated C 1 -C 12 alkyl.
9. The rubber mixture of claim 8 , wherein R 4 is a saturated and unbranched C 1 -C 12 alkyl.
10. The mixture of claim 7 , wherein R 4 is an aromatic.
11. The rubber mixture of claim 1 , wherein R 3 is ethyl.
12. The rubber mixture of claim 11 , wherein R 4 is a saturated or unsaturated C 1 -C 12 alkyl.
13. The rubber mixture of claim 12 , wherein R 4 is a saturated and unbranched C 1 -C 12 alkyl.
14. The mixture of claim 11 , wherein R 4 is an aromatic.
15. The rubber mixture of claim 1 , further comprising at least one rubber auxiliary.
16. The rubber mixture of claim 1 , comprising polymerized organosilanes of the general formula I.
17. The rubber mixture of claim 15 , wherein said rubber auxiliary is a polyalkylene glycol.
18. A process for the preparation of the rubber mixture of claim 1 , comprising the step of mixing the rubber, filler, and the organosilane of the general formula I.
19. A shaped article comprising the rubber mixture of claim 1 .
20. The shaped article of claim 19 , wherein said shaped article is a pneumatic tires, tire tread, cable sheathing, hose, drive belt, conveyor belt, roller covering, tires shoe sole, sealing ring or damping element.