Rubber blend, sulfur-crosslinkable rubber mixture, and vehicle tire
The invention relates to a rubber blend, to a sulfur-crosslinkable rubber mixture comprising the rubber blend and to a vehicle tire comprising such a rubber mixture. The rubber blend comprises at least one solution-polymerized diene polymer A of high molecular weight and at least one solution-polymerized polymer B of low molecular weight, wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups.
1. A rubber blend comprising:
at least one solution-polymerized diene polymer A of high molecular weight, formed from at least one conjugated diene and one or more optional vinylaromatic compound(s), having a vinylaromatic content of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, a glass transition temperature Tg according to DSC of −100° C.<Tg<−35° C., a molecular weight Mw according to GPC of more than 350000 g/mol, and a polydispersity PD of 1.1<PD<3;
at least one solution-polymerized polymer B of low molecular weight, formed from at least one conjugated diene, at least one conjugated diene and one or more vinylaromatic compound(s), or at least one or more vinylaromatic compound(s), having a vinylaromatic content of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, a glass transition temperature Tg according to DSC of −50° C.<Tg<+80° C., a molecular weight Mw according to GPC of 1300 g/mol<Mw<10000 g/mol, and a polydispersity PD of 1<PD<1.5;
30 to 300 phr of at least one silica; and,
1 to 20 phf of at least one blocked and/or unblocked mercaptosilane as silane coupling agent;
wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups.
2. The rubber blend as claimed in claim 1 , wherein the at least one solution-polymerized diene polymer A and the at least one solution-polymerized polymer B are incorporated as a mixture into the rubber blend in an amount of less than 85% by weight of total weight of all rubber in the rubber blend.
3. The rubber blend as claimed in claim 1 , wherein the at least one solution-polymerized diene polymer A has a molecular weight Mw according to GPC of at least 438020.
4. The rubber blend as claimed in claim 1 , wherein the at least one solution-polymerized diene polymer A has a content of vinylaromatic compound of 15% to 50% by weight.
5. The rubber blend as claimed in claim 1 , wherein the at least one solution-polymerized diene polymer A is free of solvents and other volatile substances, and wherein the at least one solution-polymerized polymer B is free of solvents and other volatile substances.
6. The rubber blend as claimed in claim 1 , wherein the rubber blend is free of high-cis butadiene rubber.
7. The rubber blend as claimed in claim 1 further comprising at least one optional silica and at least one carbon black in an amount of 25 to 300 phr, wherein the ratio of carbon black to silica in the mixture is 100:0 to 3:97.
8. The rubber blend as claimed in claim 1 , wherein the at least one solution-polymerized diene polymer A of high molecular weight has been functionalized, or the at least one solution-polymerized polymer B of low molecular weight has been functionalized, or both of the at least one solution-polymerized diene polymer A of high molecular weight and the at least one solution-polymerized polymer B of low molecular weight have been functionalized.
9. A rubber blend comprising:
at least one solution-polymerized diene polymer A of high molecular weight, formed from at least one conjugated diene and one or more optional vinylaromatic compound(s), having a vinylaromatic content of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, a glass transition temperature Tg according to DSC of −100° C.<Tg<−35° C., a molecular weight Mw according to GPC of more than 350000 g/mol, and a polydispersity PD of 1.1<PD<3;
at least one solution-polymerized polymer B of low molecular weight, formed from at least one conjugated diene, at least one conjugated diene and one or more vinylaromatic compound(s), or at least one or more vinylaromatic compound(s), having a vinylaromatic content of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, a glass transition temperature Tg according to DSC of −50° C.<Tg<+80° C., a molecular weight Mw according to GPC of 1300 g/mol<Mw<10000 g/mol, and a polydispersity PD of 1<PD<1.5;
30 to 300 phr of at least one silica; and,
1 to 150 phr of at least one hydrocarbon resin having a softening point to ASTM E 28 (Ring and Ball) of 10 to 180° C.;
wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups.
10. The rubber blend as claimed in claim 9 , wherein the at least one solution-polymerized diene polymer A and the at least one solution-polymerized polymer B are incorporated as a mixture into the rubber blend in an amount of less than 85% by weight of total weight of all rubber in the rubber blend.
11. The rubber blend as claimed in claim 9 , wherein the at least one solution-polymerized diene polymer A has a molecular weight Mw according to GPC of at least 438020.
12. The rubber blend as claimed in claim 9 , wherein the at least one solution-polymerized diene polymer A has a content of vinylaromatic compound of 15% to 50% by weight.
13. The rubber blend as claimed in claim 9 , wherein the at least one solution-polymerized diene polymer A is free of solvents and other volatile substances, and wherein the at least one solution-polymerized polymer B is free of solvents and other volatile substances.
14. The rubber blend as claimed in claim 9 , wherein the rubber blend is free of high-cis butadiene rubber.
15. The rubber blend as claimed in claim 9 further comprising at least one optional silica and at least one carbon black in an amount of 25 to 300 phr, wherein the ratio of carbon black to silica in the mixture is 100:0 to 3:97.
16. The rubber blend as claimed in claim 9 , wherein the at least one solution-polymerized diene polymer A of high molecular weight has been functionalized, or the at least one solution-polymerized polymer B of low molecular weight has been functionalized, or both of the at least one solution-polymerized diene polymer A of high molecular weight and the at least one solution-polymerized polymer B of low molecular weight have been functionalized.
17. A rubber blend comprising:
at least one solution-polymerized diene polymer A of high molecular weight, formed from at least one conjugated diene and one or more optional vinylaromatic compound(s), having a vinylaromatic content of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, a glass transition temperature Tg according to DSC of −100° C.<Tg<−35° C., a molecular weight Mw according to GPC of more than 350000 g/mol, and a polydispersity PD of 1.1<PD<3;
at least one solution-polymerized polymer B of low molecular weight, formed from at least one conjugated diene, at least one conjugated diene and one or more vinylaromatic compound(s), or at least one or more vinylaromatic compound(s), having a vinylaromatic content of 0% to 50% by weight, a vinyl content of 8% to 80% by weight based on any diene content present, a glass transition temperature Tg according to DSC of −50° C.<Tg<+80° C., a molecular weight Mw according to GPC of 1300 g/mol<Mw<10000 g/mol, and a polydispersity PD of 1<PD<1.5;
a vulcanization system comprising at least one accelerator and elemental sulfur and/or at least one sulfur donor substance, wherein the molar ratio of the at least one accelerator and the elemental sulfur is 0.18 to 5, wherein the total molar amount of the elemental sulfur consists of the elemental sulfur and sulfur released by the sulfur donor substance;
wherein at least one of polymers A and B has been functionalized at the chain end and/or along the polymer chain and/or at a coupling site with at least one group selected from epoxy groups, hydroxyl groups, carboxyl groups, silane sulfide groups, amino groups, siloxane groups, organosilicon groups, phthalocyanine groups and amino group-containing alkoxysilyl groups.
18. The rubber blend as claimed in claim 17 , wherein the at least one solution-polymerized diene polymer A and the at least one solution-polymerized polymer B are incorporated as a mixture into the rubber blend in an amount of less than 85% by weight of total weight of all rubber in the rubber blend.
19. The rubber blend as claimed in claim 17 , wherein the at least one solution-polymerized diene polymer A has a molecular weight Mw according to GPC of at least 438020.
20. The rubber blend as claimed in claim 17 , wherein the at least one solution-polymerized diene polymer A has a content of vinylaromatic compound of 15% to 50% by weight.
21. The rubber blend as claimed in claim 17 , wherein the at least one solution-polymerized diene polymer A is free of solvents and other volatile substances, and wherein the at least one solution-polymerized polymer B is free of solvents and other volatile substances.
22. The rubber blend as claimed in claim 17 , wherein the rubber blend is free of high-cis butadiene rubber.
23. The rubber blend as claimed in claim 17 further comprising at least one optional silica and at least one carbon black in an amount of 25 to 300 phr, wherein the ratio of carbon black to silica in the mixture is 100:0 to 3:97.
24. The rubber blend as claimed in claim 17 , wherein the at least one solution-polymerized diene polymer A of high molecular weight has been functionalized, or the at least one solution-polymerized polymer B of low molecular weight has been functionalized, or both of the at least one solution-polymerized diene polymer A of high molecular weight and the at least one solution-polymerized polymer B of low molecular weight have been functionalized.