Sulfur-crosslinkable rubber mixture
A sulfur-crosslinkable rubber mixture, in particular for pneumatic vehicle tires, straps, belts, and hoses, is disclosed which exhibits, among other things, improved rolling resistance behavior. The rubber mixture contains at least the following constituents: 5 to 95 phr of at least one styrene-butadiene rubber, which is functionalized with phthalocyanine groups and/or hydroxy groups and/or epoxy groups and/or silane-sulfide groups and the styrene content of which is 0 to 12 wt % and which has a glass transition temperature (T g ) according to DSC of −75 to −120° C. in the unvulcanized state, 5 to 95 phr of at least one further rubber, and 20 to 300 phr of at least one silica.
1. A sulfur-crosslinkable rubber mixture comprising:
5 to 95 phr of at least one styrene-butadiene rubber or at least one butadiene rubber,
wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber is functionalized with at least one functional group selected from the group consisting of phthalocyanine groups, hydroxy groups, epoxy groups, and silane sulfide groups, and
wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber has a styrene content of 0.1 to 9 wt %, and has a glass transition temperature (T g ) in the unvulcanized state according to DSC of −75 to −120° C.;
5 to 95 phr of at least one further rubber; and,
20 to 300 phr of at least one silica.
2. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , further comprising:
5 to 20 phr of natural polyisoprene and/or 5 to 20 phr of synthetic polyisoprene.
3. The sulfur-crosslinkable rubber mixture as claimed in claim 1 comprising:
10 to 70 phr of the at least one styrene-butadiene rubber or the at least one butadiene rubber, and
10 to 70 phr of a solution-polymerized styrene-butadiene rubber having a glass transition temperature of −40 to +10° C.
4. The sulfur-crosslinkable rubber mixture as claimed in claim 3 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber is functionalized with silane sulfide groups.
5. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber has a glass transition temperature (T g ) according to DSC of −80 to −110° C.
6. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber is functionalized at their ends with at least one of phthalocyanine groups, hydroxy groups, epoxy groups, and silane sulfide groups.
7. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber has a styrene content of 0.1 wt % to 7 wt %.
8. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber has a styrene content of 0.1 wt % to 5 wt %.
9. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber has a styrene content of 0.1 wt % to 2 wt %.
10. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one further rubber is styrene-butadiene rubber having a glass transition temperature (T g ) in the unvulcanized state according to DSC of −40° C. to +10° C., and is present at between 10 and 34 phr.
11. The sulfur-crosslinkable rubber mixture as claimed in claim 10 , wherein the at least one further rubber is styrene-butadiene rubber having a glass transition temperature (T g ) in the unvulcanized state according to DSC of −25° C. to +10° C., and is present at between 24 and 34 phr.
12. The sulfur-crosslinkable rubber mixture as claimed in claim 1 , wherein the at least one styrene-butadiene rubber or the at least one butadiene rubber is functionalized with hydroxyl groups.
13. A vehicle tire comprising the sulfur-crosslinkable rubber mixture as claimed in claim 1 in at least one component.
14. The vehicle tire as claimed in claim 13 , wherein the component is a tread and/or a side wall.
15. A method of manufacturing a vehicle tire comprising preparing the rubber mixture as claimed in claim 1 .
16. A method of manufacturing a strap, belt, or hose comprising preparing the rubber mixture as claimed in claim 1 .