Vulcanizable rubber compounds and process for their production

1. A rubber compound with improved processability comprising

a) at least one rubber polymer,

b) a silane-containing butadiene oil, a silane containing polyisoprene oil, or a mixture thereof,

c) a sulfur donor having a melting point <100° C.,

d) 5 to 120 parts of a silica,

e) 0 to 100 parts of a rubber carbon black, relative in each case to 100 parts of the rubber polymer,

wherein component b) has a silane content of 1 to 10% and a molecular weight (M n ) of 1,000 to 10,000.

2. The rubber compound according to claim 1 , wherein the rubber polymer is selected from the group consisting of styrene butadiene rubber, butadiene rubber, natural rubber and a mixture thereof.

3. The rubber compound according to claim 1 , wherein component b) is present in 1 to 25 parts.

4. The rubber compound according to claim 3 , wherein component b) is present in about 5 to 10 parts.

5. The rubber compound according to claim 1 , wherein component c) is selected from the group consisting of dithiophosphatopolysulfides, phosphoryl polysulfide, sulfured castor oils and sulfur containing alkanoic acids of the formula HOOC—(C n H 2n )—S x , wherein n is between 2 and 5, and x is between 2 and 5.

6. The rubber compound according to claim 5 , wherein component c) is a phosphoryl polysulfide.

7. The rubber compound according to claim 1 , further comprising a vulcanizing agent.

8. The rubber compound according to claim 1 , further comprising auxiliary substances, fillers or a mixture thereof.

9. A process for producing rubber compounds according to claim 1 , comprising the steps of mixing components a), b), d), optionally e) and optionally a plasticizer at a temperature of 120° C. to 200° C., then admixing component c) and optionally auxiliary substances and fillers at a temperature <120° C.

10. The process according to claim 9 , wherein component d) is reacted with component b) before mixing with component a) and optionally component e).

11. A process for producing rubber compounds according to claim 1 , comprising the steps of mixing components a), d), and optionally, a) at a temperature of 120° C. to 200° C., then admixing component b) and then admixing component c).

12. A molding comprising a rubber compound comprised of

a) at least one rubber polymer,

b) a silane-containing butadiene, a silane containing polyisoprene oil, or a mixture thereof,

c) a sulfur donor having a melting point <100° C.,

d) 5 to 120 parts of a silica,

e) 0 to 100 parts of a rubber carbon black,

relative in each case to 100 parts of the rubber polymer,

wherein component b) has a silane content of 1 to 10% and a molecular weight (M n ) of 1,000 to 10,000.

13. A molding according to claim 12 in the form of a tire component.