Reinforced product comprising a composition containing a rapid vulcanization accelerator 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, a reinforcing filler, and a sulfur-based vulcanization system, which system comprises a vulcanization accelerator having a vulcanization initiation time, referred to as “t 0 ”, of less than 3.5 minutes, preferably of less than or equal to 3 minutes.
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, a reinforcing filler, and a sulfur-based vulcanization system, said system comprising a vulcanization accelerator having a vulcanization initiation time t 0 of less than 3.5 minutes,
wherein a sulfur content of the sulfur-based vulcanization system is within a range extending from 0.5 to 3 phr, and
wherein a ratio between the sulfur content of the sulfur-based vulcanization system and the vulcanization accelerator content is within a range extending from 0.1 to 4.
2. The reinforced product according to claim 1 , wherein the vulcanization accelerator has a vulcanization initiation time t 0 of less than or equal to 3 minutes.
3. The reinforced product according to claim 1 , wherein the vulcanization accelerator comprises compounds of thiuram family, thiocarbamate derivatives, sulphenamides, thiophosphates, or mixtures thereof.
4. The reinforced product according to claim 3 , wherein the vulcanization accelerator comprises N-cyclohexyl-2-benzothiazolesulphenamide.
5. The reinforced product according to claim 1 , wherein the coating rubber composition has a ratio of the amounts, in phr (parts by weight per hundred parts by weight of elastomer), of sulfur of the sulfur-based vulcanization system and of reinforcing filler, of less than 0.08.
6. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a metal oxide and a stearic acid derivative in addition to the vulcanization accelerator in amounts such that a ratio of the content of metal oxide and of stearic acid derivative, in phr, is less than 7.
7. The reinforced product according to claim 1 , wherein the coating rubber composition comprises zinc oxide and stearic acid in addition to the vulcanization accelerator in amounts such that a ratio of the content of zinc oxide and of stearic acid, in phr, is less than 7.
8. The reinforced product according to claim 7 , wherein the ratio of the content of zinc oxide and of stearic acid, in phr, is between 1 and 3.
9. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a metal oxide in addition to the vulcanization accelerator at a content of less than 7 phr and a stearic acid derivative at a content of greater than 1 phr.
10. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a metal oxide in addition to the vulcanization accelerator at a content within a range extending from 1 to 7 phr.
11. The reinforced product according to claim 1 , wherein the coating rubber composition comprises a stearic acid derivative in addition to the vulcanization accelerator at a content within a range extending from 1 to 3 phr.
12. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise vulcanization retarder.
13. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise cobalt salt.
14. The reinforced product according to claim 1 , wherein the coating rubber composition does not comprise an adhesion promoter.
15. 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.
16. The reinforced product according to claim 1 , wherein the coating rubber composition comprises from 20 to 80 phr of reinforcing filler.
17. The reinforced product according to claim 1 , wherein the coating rubber comprises carbon black as the predominant reinforcing filler.
18. The reinforced product according to claim 1 , wherein the one or more textile or metallic reinforcing threads are one or more metallic reinforcing threads.
19. The reinforced product according to claim 1 , wherein the sheathed one or more textile or metallic reinforcing threads are coated with an adhesive.
20. The reinforced product according to claim 19 , wherein the adhesive is a resorcinol-formaldehyde-latex adhesive.
21. A tire comprising the reinforced product according to claim 1 .
22. The tire according to claim 21 , wherein the reinforced product is present in the tire at least in one ply selected from crown reinforcing plies and carcass plies.