Reinforced product comprising a composition with a low sulfur content and tire comprising said reinforced product
View Patent ↗A reinforced product, which can be used especially for reinforcing a finished rubber article, comprises one or more textile or metallic reinforcing thread(s), said thread(s) being covered with a sheath comprising a thermoplastic polymer composition, the sheathed thread(s) being themselves embedded in a rubber composition referred to as coating rubber, characterized in that this coating rubber is a composition based on at least one diene elastomer, silica as predominant reinforcing filler, and a sulfur-based vulcanization system, in which the ratio of the amounts, in phr (parts by weight per hundred parts by weight of elastomer), of sulfur and of reinforcing filler, is less than 0.08.
1. A reinforced product comprising one or more textile or metallic reinforcing threads, said one or more textile or metallic reinforcing threads being covered with a sheath comprising a thermoplastic polymer composition, the sheathed one or more textile or metallic reinforcing threads being themselves embedded in a coating rubber composition,
wherein the coating rubber composition is based on at least one diene elastomer, silica as predominant reinforcing filler, and a sulfur-based vulcanization system, in which a ratio of the amounts, in phr (parts by weight per hundred parts by weight of elastomer), of sulfur and of reinforcing filler, is less than 0.08.
2. The reinforced product according to claim 1 , wherein the amount of sulfur is less than or equal to 5 phr.
3. The reinforced product according to claim 2 , wherein the amount of sulfur is within a range from 0.1 to 5 phr.
4. The reinforced product according to claim 1 , wherein the vulcanization system comprises a vulcanization accelerator having a vulcanization initiation time t0 of less than 3.5 minutes.
5. The reinforced product according to claim 4 , wherein the vulcanization accelerator is selected from the group consisting of compounds of the thiuram family, thiocarbamate derivatives, sulphenamides, thiophosphates and mixtures thereof.
6. The reinforced product according to claim 5 , wherein the sulphenamides vulcanization accelerator comprises N-cyclohexyl-2-benzothiazolesulphenamide.
7. The reinforced product according to claim 4 , wherein a ratio between the amount of sulfur and the vulcanization accelerator content is less than 4.
8. The reinforced product according to claim 4 , wherein a ratio between the amount of sulfur and the vulcanization accelerator content is within a range extending from 0.1 to 4.
9. The reinforced product according to claim 1 , wherein the vulcanization system comprises a metal oxide and a stearic acid derivative in amounts such that a ratio of the amounts of metal oxide and of stearic acid derivative is less than 7.
10. The reinforced product according to claim 1 , wherein the vulcanization system comprises zinc oxide and stearic acid in amounts such that a ratio of the amounts of zinc oxide and of stearic acid is less than 7.
11. The reinforced product according to claim 10 , wherein the ratio of the amounts of zinc oxide and of stearic acid is between 1 and 3.
12. The reinforced product according to claim 9 , wherein the metal oxide is present in an amount of less than 7 phr and the stearic acid derivative is present in an amount of greater than 1 phr.
13. The reinforced product according to claim 9 , wherein the metal oxide is present in an amount within a range from 1 to 7 phr.
14. The reinforced product according to claim 9 , wherein the stearic acid derivative is present in an amount within a range from 1 to 3 phr.
15. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise vulcanization retarder.
16. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise cobalt salt.
17. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise an adhesion promoter.
18. The reinforced product according to claim 1 , wherein the at least one diene elastomer predominantly comprises an elastomer selected from the group consisting of natural rubber, synthetic polyisoprene and a mixture thereof.
19. The reinforced product according to claim 1 , wherein the coating rubber composition comprises from 20 to 80 phr of silica.
20. The reinforced product according to claim 1 , wherein the coating rubber composition comprises carbon black as a minor filler within a range from 1 to 20 phr.
21. The reinforced product according to claim 1 , wherein the one or more textile or metallic reinforcing threads are one or more metallic reinforcing threads.
22. The reinforced product according to claim 1 , wherein the sheath is coated with an adhesive.
23. The reinforced product according to claim 22 , wherein the adhesive is a resorcinol-formaldehyde-latex adhesive.
24. A tire comprising the reinforced product according to claim 1 .
25. The tire according to claim 24 , wherein the reinforced product is present in the tire at least in one ply selected from the group consisting of crown reinforcing plies and carcass plies.