Sealant material composition, self-sealing pneumatic tire, and preparation thereof
Pneumatic tire including a sealant material composition providing puncture sealing property within the sealant material composition includes a compound containing a diphenyldisulfide structure therein.
1. A sealant material composition comprising at least one non-halogenated butyl rubber, and 2,2′-dibenzamido-diphenyldisulfide, the sealant material composition having a viscosity that permits the sealant material composition to be incorporated into a tire during a tire building process and to degrade to a lower viscosity that permits the resulting degraded sealant material composition to flow into and seal a puncture in a tire.
2. The sealant material composition according to claim 1 , wherein the sealant material composition has an elastic storage modulus of 75 to 250 pka at 10% strain.
3. The sealant material composition according to claim 1 , wherein the resulting degraded sealant material composition has an elastic storage modulus of 1 to 25 pka at 10% strain.
4. The sealant material composition according to claim 3 , wherein the sealant has an elastic storage modulus of 75 to 250 pka at 10% strain.
5. The sealant material composition according to claim 1 , wherein the 2,2′-dibenzamido-diphenyldisulfide is present in an amount of 2 to 20 phr.
6. The sealant material composition according to claim 5 , wherein the 2,2′-dibenzamido-diphenyldisulfide is present in an amount of 5 to 15 phr.
7. The sealant material composition according to claim 4 , further including at least one modulus agent.
8. The sealant material composition according to claim 7 , wherein the at least one modulus agent comprises at least one silica containing material.
9. The sealant material composition according to claim 7 , wherein the at least one modulus agent is present in an amount of 5 to 50 phr.
10. The sealant material composition according to claim 4 , further comprising at least one process oil.
11. The sealant material composition according to claim 10 , wherein the at least one process oil is present in an amount of 10 to 40 phr.
12. The sealant material composition according to claim 4 , further comprising at least one non-reinforcing filler.
13. The sealant material composition according to claim 12 , wherein the at least one non-reinforcing filler comprises at least one clay.
14. The sealant material composition according to claim 12 , wherein the at least one non-reinforcing filler is present in an amount of up to 15 phr.
15. The sealant material composition according to claim 4 , further comprising at least one tackifying agent.
16. The sealant material composition according to claim 15 , wherein the at least one tackifying agent comprises at least one phenolic resin.
17. The sealant material composition according to claim 15 , wherein the at least one tackifying agent is present in an amount of up to 5 phr.
18. The sealant material composition according to claim 4 , further comprising a whiting agent.
19. The sealant material composition according to claim 4 , further comprising, in addition to the at least one non-halogenated butyl rubber and the 2,2′-dibenzamido-diphenyldisulfide, at least one plasticizer.
20. A method of forming a sealant composition comprising combining at least one non-halogenated butyl rubber and 2,2′-dibenzamido-diphenyldisulfide so at the sealant material composition has a viscosity that permits the sealant material composition to be incorporated into a tire during a tire building process and to degrade to a lower viscosity that permits the resulting degraded sealant material composition to flow into and seal a puncture in a tire.
21. A sealant material composition formed by the method of claim 20 .
22. An unvulcanized tire comprising an innerlayer, a carcass layer, and a sealant material composition material containing the sealant material composition of claim 1 as a layer between the innerlayer and the carcass layer.
23. An unvulcanized tire comprising an innerlayer, a carcass layer, and a sealant material composition material containing the sealant material composition of claim 21 as a layer between the innerlayer and the carcass layer.
24. The unvulcanized tire according to claim 23 , wherein the layer of sealant material composition has a thickness of 0.1 inch to 0.5 inch.
25. The unvulcanized tire according to claim 23 , wherein the layer of sealant material composition has a thickness of 0.2 to 0.5 inch.
26. A vulcanized tire comprising the sealant material composition according to claim 1 , and the resulting degraded sealant material composition.
27. A vulcanized tire comprising the sealant material composition according to claim 21 , and the resulting degraded sealant material composition.